CN114537164B - Power battery pack device, heating control system and electric automobile - Google Patents

Power battery pack device, heating control system and electric automobile Download PDF

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Publication number
CN114537164B
CN114537164B CN202210147654.1A CN202210147654A CN114537164B CN 114537164 B CN114537164 B CN 114537164B CN 202210147654 A CN202210147654 A CN 202210147654A CN 114537164 B CN114537164 B CN 114537164B
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Prior art keywords
switch module
power battery
period
battery pack
winding
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CN202210147654.1A
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Chinese (zh)
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CN114537164A (en
Inventor
黄炜华
石超杰
方振
毋超强
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Huawei Electric Technology Co ltd
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Huawei Electric Technology Co ltd
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Priority to CN202210147654.1A priority Critical patent/CN114537164B/en
Priority to CN202310087465.4A priority patent/CN116080422A/en
Publication of CN114537164A publication Critical patent/CN114537164A/en
Priority to PCT/CN2022/115792 priority patent/WO2023155413A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model provides a power battery group device, heating control system and electric automobile, power battery group device is including the first power battery group, first switch module and the first energy storage module that connect gradually, and the second power battery group, second switch module and the second energy storage module that connect gradually, first energy storage module still links to each other with second energy storage module, the positive pole of first power battery group still links to each other with the positive pole of second power battery group, or the negative pole of first power battery group still links to each other with the negative pole of second power battery group. Through constituting the return circuit between first power battery group, first switch module, first energy storage module, second switch module and second power battery group, can form high frequency pulse current in this return circuit through the alternative charge-discharge between two power battery groups, and then utilize this high frequency pulse current to heat power battery group, this design need not additionally to set up heating device, helps saving cost, reduces the complexity of design.

Description

Power battery pack device, heating control system and electric automobile
Technical Field
The application relates to the technical field of power battery heating, in particular to a power battery pack device, a heating control system and an electric automobile.
Background
The lithium battery is a novel rechargeable battery with high voltage and high energy density, has the advantages of light weight, large energy storage capacity, no pollution, no memory effect, long service life and the like, and is the most commonly used battery material in the power battery pack of the electric automobile at present.
However, lithium batteries have a characteristic in that the battery capacity and the charge and discharge speed are reduced as the ambient temperature is lowered. Based on the characteristic, under the scene of lower ambient temperature, the electric automobile usually needs to heat the power battery pack when starting so as to fully exert the energy storage and charge-discharge capacity of the power battery pack. However, in the electric vehicles on the market, a heating device is usually arranged around the power battery pack so as to heat the power battery pack by using the heating device when the electric vehicle is started. However, such an additional heating device not only increases the cost of the electric vehicle, but also increases the complexity of the circuit design of the electric vehicle, which is not favorable for the overall layout of the electric vehicle.
Therefore, the heating scheme of the power battery pack is still under further study.
Disclosure of Invention
In view of the above, the present application provides a power battery pack apparatus, a heating control system and an electric vehicle, which are used to form a loop between two power battery packs, and use a high-frequency pulse current generated in the loop to heat the power battery packs, so as to solve the technical problem of high circuit cost and complexity that a heating apparatus needs to be additionally arranged to heat the power battery packs.
In a first aspect, the present application provides a power battery pack apparatus, including a first battery unit and a second battery unit, where the first battery unit includes a first power battery pack, a first switch module and a first energy storage module, a first dc end of the first switch module is connected to an anode of the first power battery pack, a second dc end of the first switch module is connected to a cathode of the first power battery pack, an ac end of the first switch module is connected to a first end of the first energy storage module, the second module includes a second power battery pack, a second switch module and a second energy storage module, a first dc end of the second switch module is connected to an anode of the second power battery pack, a second dc end of the second switch module is connected to a cathode of the second power battery pack, an ac end of the second switch module is connected to a first end of the second energy storage module, and a second end of the first energy storage module is connected to a second end of the second energy storage module, an anode of the first power battery pack is connected to an anode of the second power battery pack, or a cathode of the first power battery pack is connected to a cathode of the second power battery pack.
In the above design, by forming a loop between the two power battery packs, it is helpful to form a high-frequency pulse current in the loop through the alternate charging and discharging between the two power battery packs, and further the high-frequency pulse current can be used to heat the power battery packs, so as to realize the effective and rapid heating of the power battery packs in a low-temperature environment. The circuit design can be realized by connecting related nodes between the two power battery packs through cables without additionally arranging a heating device, so that the cost is saved, and the design complexity is reduced. Moreover, by arranging the double-power battery pack, when one power battery pack fails, the other power battery pack can be switched to discharge in time, and therefore, the function of equipment (such as an electric automobile) using the power battery pack device can be smoothly realized by redundancy backup of the double-power battery pack.
In a possible design, the first switch module comprises a first three-phase rectifier bridge, the first energy storage module comprises a first three-phase winding, the first ends of three windings in the first three-phase winding are connected with three alternating current ends of the first three-phase rectifier bridge, and the second ends of the three windings in the first three-phase winding are connected to form the second end of the first energy storage module. In this design, through using the three-phase rectifier bridge as first switch module, can not only realize the switch function of first switch module, can also improve the stability of current waveform and the utilization ratio of electric energy in the first battery unit through the distinctive rectification filtering function of three-phase rectifier bridge.
In one possible design, the second switch module comprises a second three-phase rectifier bridge, the second energy storage module comprises a second three-phase winding, the first ends of the three windings in the second three-phase winding are connected with the three alternating current ends of the second three-phase rectifier bridge, and the second ends of the three windings in the second three-phase winding are connected to form the second end of the second energy storage module. In this design, through using the three-phase rectifier bridge as second switch module, can not only realize the switch function of second switch module, can also improve the stability of current waveform and the utilization ratio of electric energy in the second battery unit through the distinctive rectification filtering function of three-phase rectifier bridge.
In one possible design, the first three-phase winding and the second three-phase winding satisfy one of the following conditions: the first three-phase winding and the second three-phase winding are two three-phase motors; the first three-phase winding and the second three-phase winding belong to a six-phase motor; alternatively, the first three-phase winding and the second three-phase winding belong to a motor having two independent sets of three-phase windings. Specifically, when the power battery pack apparatus is applied to an electric vehicle, the motor may be a motor inherent in the electric vehicle. So, through the energy storage module in regarding as the power battery group with inherent motor among the electric automobile, can utilize the inherent device among the electric automobile to realize the function of heating power battery group, and then avoid additionally adding the device, help sparingly circuit cost and space.
In one possible design, the rectifier tubes in the first three-phase rectifier bridge and/or the second three-phase rectifier bridge are switch modules with anti-parallel diodes. In this way, even if the semiconductor device in the switching module is turned off, the freewheeling of the switching module is achieved by the diode connected in anti-parallel with the semiconductor device.
In a possible design, the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, the first switch module and the second switch module are connected in series, the third switch module and the fourth switch module are connected in series, the fifth switch module and the sixth switch module are connected in series, the first switch module is connected in series relative to the non-series node one end of the second switch module, the third switch module is connected in series relative to the non-series node one end of the fourth switch module and the non-series node one end of the fifth switch module relative to the sixth switch module respectively connect the anode of the first power battery pack, the second switch module is connected in series relative to the non-series node one end of the first switch module, the fourth switch module is connected in series relative to the non-series node one end of the third switch module and the sixth switch module is connected in series relative to the non-series node one end of the fifth switch module respectively connect the cathode of the first power battery pack, and the series nodes of the first switch module and the second switch module, the series nodes of the third switch module and the fourth switch module, the series node of the third switch module and the sixth switch module are connected in series connection three phase windings. Correspondingly, the second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, the seventh switch module and the eighth switch module are connected in series, one end of the seventh switch module, which is opposite to the non-series node of the eighth switch module, one end of the ninth switch module, which is opposite to the non-series node of the tenth switch module, and one end of the eleventh switch module, which is opposite to the non-series node of the twelfth switch module, are respectively connected with the anode of the second power battery pack, one end of the eighth switch module, which is opposite to the non-series node of the seventh switch module, one end of the tenth switch module, which is opposite to the non-series node of the ninth switch module, and one end of the twelfth switch module, which is opposite to the non-series node of the eleventh switch module, are respectively connected with the cathode of the second power battery pack, and three ends of the series nodes of the seventh switch module, the eighth switch module, the ninth switch module, the eleventh switch module and the twelfth switch module, which are connected with the series node of the third winding, are connected with the third winding. In the design, the switch module is designed into a three-phase full-wave rectifier bridge, and the six switch modules on the three-phase full-wave rectifier bridge can be utilized to accurately control whether each connected winding works or not, so that the energy storage function based on one winding or a plurality of windings is realized conveniently.
In a second aspect, an embodiment of the present application provides a heating control system, including a power battery pack apparatus as set forth in any one of the above first aspects, and a control device configured to: the first power battery pack and the second power battery pack are controlled to discharge alternately by controlling the first switch module and the second switch module, the electric quantity discharged by the first power battery pack charges the second power battery pack, and the electric quantity discharged by the second power battery pack charges the first power battery pack. Therefore, by controlling the two power battery packs to discharge alternately, high-frequency pulse current can be generated in the loop, so that the power battery packs can be heated effectively and quickly in a low-temperature environment.
In a possible design, the first energy storage module and the second energy storage module comprise motors, the control device comprises a main controller, a battery manager and a motor controller, the battery manager is respectively connected with the main controller, the first power battery pack and the second power battery pack, the motor controller is respectively connected with the main controller, the first switch module, the second switch module, the first energy storage module and the second energy storage module, under the condition, the battery manager is used for obtaining the charge state and the current temperature of each power battery pack, the motor controller is used for obtaining the working state of each energy storage module, the main controller is further used for determining that the sum of the electric quantity of each power battery pack is enough to start the electric vehicle according to the charge state of each power battery pack, determining that each power battery pack is in a low-temperature state according to the current temperature of each power battery pack, and generating a control signal and sending the control signal to the motor controller after determining that each energy storage module does not work according to the working state of each energy storage module, so that the motor controller controls the first power battery pack and the second power battery pack to alternately discharge by controlling the conduction and the turn-off of each switch module in the first power battery pack according to the control signal. Through this design, controlling means can just carry out heating control when confirming the state of motor and battery and satisfying predetermined heating condition, and then do not carry out heating control when unsatisfying predetermined heating condition, so can avoid meaningless heating operation, save controlling means's processing resources.
In a possible design, under the condition that the first energy storage module comprises a first three-phase winding and the second energy storage module comprises a second three-phase winding, the control device may determine a target high-frequency pulse current according to a temperature difference between an ambient temperature and a target temperature, a preset heating time, and a corresponding relationship between the preset temperature difference, the preset heating time and the high-frequency pulse current, when the target high-frequency pulse current is less than a first current threshold, control the first power battery pack and the second power battery pack to alternately discharge through one of the corresponding three-phase windings by controlling the first switch module and the second switch module, when the target high-frequency pulse current is not less than the first current threshold and is less than a second current threshold, control the first power battery pack and the second power battery pack to alternately discharge through two of the corresponding three-phase windings by controlling the first switch module and the second switch module, and control the first power battery pack and the second power battery pack to alternately discharge through three of the corresponding three-phase windings by controlling the first switch module and the second switch module when the target high-frequency pulse current is not less than the second current threshold. In this design, by referring to a required target high-frequency pulse current and selecting as few windings as possible among the number of windings capable of supplying the target high-frequency current to achieve heating, the temperature of the power battery pack can be surely heated to a target temperature within a preset heating time period, the use frequency of the windings can be reduced as much as possible, and the service life of the motor can be prolonged.
In one possible design, under the condition that the temperature difference and the preset heating duration in the corresponding relationship among the preset temperature difference, the heating duration and the high-frequency pulse current correspond to the plurality of high-frequency pulse currents, the control device selects a target high-frequency pulse current from the plurality of high-frequency pulse currents, then obtains a first maximum current of the first three-phase winding at a frequency corresponding to the target high-frequency pulse current, a second maximum current of the second three-phase winding at a frequency corresponding to the target high-frequency pulse current, and a third maximum current corresponding to a connection node of the first three-phase winding and the second three-phase winding, and then reselects the target high-frequency pulse current from the plurality of high-frequency pulse currents if the target high-frequency pulse current is greater than a minimum value among the first maximum current, the second maximum current and the third maximum current. In the design, the target high-frequency pulse current is selected again under the condition that the power battery pack device cannot bear the target high-frequency pulse current, so that the target high-frequency current borne by the power battery pack device can be ensured to be heated, and the safety of each device in the power battery pack device is protected.
In one possible design, one alternation cycle includes a first time period and a second time period, the first time period is before the second time period, a cathode of the first power battery pack is connected to a cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the first power battery pack is greater than a voltage of the second power battery pack, the control device is specifically configured to: in a first sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period; in a first sub-period of the second period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and in a second sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In the above design, under the condition that the first power battery pack and the second power battery pack share a cathode and the voltage of the first power battery pack is greater than that of the second power battery pack, the on/off of each switch module is controlled according to the control logic, so that electric energy flows from the first power battery pack with high voltage to the second power battery pack with low voltage in the previous period of a cycle, that is, the power battery pack device works in a Buck mode, and electric energy flows from the second power battery pack with low voltage to the first power battery pack with high voltage in the later period of the cycle, that is, the power battery pack device works in a Boost mode.
In one possible design, one alternating cycle includes a first time period and a second time period, the first time period is after the second time period, the cathode of the first power battery pack is connected to the cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, and if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically configured to: in a first sub-period of the second period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a second sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and in the second sub-period of the first period, controlling the first to twelfth switch modules to be switched off.
In the above design, under the condition that the first power battery pack and the second power battery pack share a cathode and the voltage of the first power battery pack is greater than that of the second power battery pack, the on and off of each switch module is controlled according to the control logic, so that electric energy flows from the second power battery pack with low voltage to the first power battery pack with high voltage in the previous period of a cycle, that is, the power battery pack device works in a Boost mode, and electric energy flows from the first power battery pack with high voltage to the second power battery pack with low voltage in the later period of the cycle, that is, the power battery pack device works in a Buck mode.
In one possible design, an alternating cycle includes a first time period and a second time period, the first time period is before the second time period, a cathode of the first power battery pack is connected to a cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, and if a voltage of the second power battery pack is greater than a voltage of the first power battery pack, the control device is specifically configured to: controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; in a second sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and in a second sub-period of the second period, controlling the first to twelfth switch modules to be switched off.
In the above design, under the condition that the first power battery pack and the second power battery pack share a cathode and the voltage of the first power battery pack is smaller than the voltage of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the first power battery pack with low voltage to the second power battery pack with high voltage in the previous period of a cycle, that is, the power battery pack device works in a Boost mode, and electric energy flows from the second power battery pack with high voltage to the first power battery pack with low voltage in the later period of the cycle, that is, the power battery pack device works in a Buck mode.
In one possible design, one alternating cycle includes a first time period and a second time period, the first time period is after the second time period, the cathode of the first power battery pack is connected to the cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, and if the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically configured to: in a first sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a second sub-period of the second period, controlling the first to twelfth switch modules to be turned off; controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; and in the second sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In the above design, under the condition that the first power battery pack and the second power battery pack share a cathode and the voltage of the first power battery pack is smaller than the voltage of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the second power battery pack with high voltage to the first power battery pack with low voltage in the previous period of a cycle, that is, the power battery pack device works in a Buck mode, and electric energy flows from the first power battery pack with low voltage to the second power battery pack with high voltage in the later period of the cycle, that is, the power battery pack device works in a Boost mode.
In one possible design, one alternation cycle includes a first time period and a second time period, the first time period is before the second time period, the anode of the first power battery pack is connected to the anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically configured to: in a first sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period; controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the second period; and in a second sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In the design, under the condition that the first power battery pack and the second power battery pack share the anode and the voltage of the first power battery pack is larger than that of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the first power battery pack with high voltage to the second power battery pack with low voltage in the previous period of a cycle, namely, the power battery pack device works in a Buck mode, and electric energy flows from the second power battery pack with low voltage to the first power battery pack with high voltage in the later period of the cycle, namely, the power battery pack device works in a Boost mode.
In one possible design, one alternation cycle includes a first time period and a second time period, the first time period is after the second time period, the anode of the first power battery pack is connected to the anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically configured to: controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the second period; in a second sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except for the turned-on switch module to be turned off; in a first sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period.
In the above design, under the condition that the first power battery pack and the second power battery pack share the anode and the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the second power battery pack with low voltage to the first power battery pack with high voltage in the previous period of a cycle, that is, the power battery pack device works in a Boost mode, and electric energy flows from the first power battery pack with high voltage to the second power battery pack with low voltage in the later period of the cycle, that is, the power battery pack device works in a Buck mode.
In one possible design, one alternation cycle includes a first time period and a second time period, the first time period is before the second time period, an anode of the first power battery pack is connected to an anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the second power battery pack is greater than a voltage of the first power battery pack, the control device is specifically configured to: controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; in a second sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of a second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and controlling the first to twelfth switch modules to be switched off in a second sub-period of the second period.
In the above design, under the condition that the first power battery pack and the second power battery pack share the anode and the voltage of the first power battery pack is smaller than the voltage of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the first power battery pack with low voltage to the second power battery pack with high voltage in the previous period of a cycle, that is, the power battery pack device works in a Boost mode, and electric energy flows from the second power battery pack with high voltage to the first power battery pack with low voltage in the later period of the cycle, that is, the power battery pack device works in a Buck mode.
In one possible design, one alternation cycle includes a first time period and a second time period, the first time period is after the second time period, the anode of the first power battery pack is connected to the anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically configured to: in a first sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the second period; controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; and in the second sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In the above design, under the condition that the first power battery pack and the second power battery pack share the anode and the voltage of the first power battery pack is smaller than the voltage of the second power battery pack, the switch modules are controlled according to the control logic, so that electric energy flows from the second power battery pack with high voltage to the first power battery pack with low voltage in the previous period of a cycle, that is, the power battery pack device works in a Buck mode, and electric energy flows from the first power battery pack with low voltage to the second power battery pack with high voltage in the later period of the cycle, that is, the power battery pack device works in a Boost mode.
In a third aspect, the present application provides a heating control method for a control device connected to a power battery pack apparatus as defined in any one of the first aspect, the method comprising: the first power battery pack and the second power battery pack are controlled to discharge alternately by controlling the first switch module and the second switch module, the electric quantity discharged by the first power battery pack charges the second power battery pack, and the electric quantity discharged by the second power battery pack charges the first power battery pack.
In one possible design, before controlling the first switch module and the second switch module, the method further includes: the method comprises the steps of obtaining the charge state and the current temperature of each power battery pack and the working state of each energy storage module, determining that the sum of electric quantity of each power battery pack is enough to start the electric automobile according to the charge state of each power battery pack, determining that each power battery pack is in a low-temperature state according to the current temperature of each power battery pack, and determining that each energy storage module does not work according to the working state of each energy storage module.
In one possible design, in a case where the first energy storage module includes a first three-phase winding and the second energy storage module includes a second three-phase winding, the first power battery pack and the second power battery pack are controlled to alternately discharge by controlling the first switch module and the second switch module, including: determining a target high-frequency pulse current according to the temperature difference between the environment temperature and the target temperature, the preset heating time and the corresponding relation among the preset temperature difference, the preset heating time and the high-frequency pulse current; when the target high-frequency pulse current is smaller than a first current threshold value, controlling the first power battery pack and the second power battery pack to alternately discharge through one winding of the corresponding three-phase windings by controlling the first switch module and the second switch module; when the target high-frequency pulse current is not less than a first current threshold and less than a second current threshold, controlling the first power battery pack and the second power battery pack to alternately discharge through two windings in the corresponding three-phase windings by controlling the first switch module and the second switch module; when the target high-frequency pulse current is not smaller than the second current threshold value, the first power battery pack and the second power battery pack are controlled to alternately discharge through three windings in the corresponding three-phase windings by controlling the first switch module and the second switch module.
In one possible design, in a case where the temperature difference and the preset heating time period correspond to a plurality of high-frequency pulse currents in the preset correspondence relationship among the temperature difference, the heating time period, and the high-frequency pulse currents, the method further includes: the method comprises the steps of firstly selecting a target high-frequency pulse current from a plurality of high-frequency pulse currents, then obtaining a first maximum current of a first three-phase winding under the frequency corresponding to the target high-frequency pulse current, a second maximum current of a second three-phase winding under the frequency corresponding to the target high-frequency pulse current and a third maximum current corresponding to a connecting node of the first three-phase winding and the second three-phase winding, and then reselecting the target high-frequency pulse current from the plurality of high-frequency pulse currents if the target high-frequency pulse current is smaller than the minimum value of the first maximum current, the second maximum current and the third maximum current.
In one possible design, an alternating cycle includes a first period and a second period, the first period precedes the second period, a cathode of the first power battery pack is connected to a cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the first power battery pack is greater than a voltage of the second power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period; in a first sub-period of the second period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and in a second sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In one possible design, where one alternation cycle includes a first period and a second period, the first period is after the second period, the cathode of the first power battery pack is connected to the cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of the second period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a second sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period.
In one possible design, an alternating cycle includes a first period and a second period, the first period precedes the second period, a cathode of the first power battery pack is connected to a cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the second power battery pack is greater than a voltage of the first power battery pack, the first switch module and the second switch module are controlled, including: controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; in a second sub-period of the first period, controlling one or more of the first switch module, the third switch module and the fifth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and controlling the first to twelfth switch modules to be switched off in a second sub-period of the second period.
In one possible design, an alternating cycle may include a first period and a second period, the first period is after the second period, the cathode of the first power battery pack is connected to the cathode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, and if the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the second period; controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; and controlling one or more of the first switch module, the third switch module and the fifth switch module to be turned on and controlling other switch modules except the turned-on switch module to be turned off in a second sub-period of the first period.
In one possible design, an alternating cycle includes a first time period and a second time period, the first time period is before the second time period, an anode of the first power battery pack is connected to an anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the first power battery pack is greater than a voltage of the second power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period; controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the second period; and in a second sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In one possible design, one alternation cycle includes a first period and a second period, the first period is after the second period, the anode of the first power battery pack and the anode of the second power battery pack are connected, and in the case that the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of the second period, controlling one or more of the first switch module, the third switch module and the fifth switch module and one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off; in a second sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except for the turned-on switch module to be turned off; in a first sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; and controlling the first to twelfth switch modules to be switched off in a second sub-period of the first period.
In one possible design, one alternation cycle includes a first period and a second period, the first period precedes the second period, an anode of the first power battery pack and an anode of the second power battery pack are connected, and in a case where the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, if a voltage of the second power battery pack is greater than a voltage of the first power battery pack, the first switch module and the second switch module are controlled, including: controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; in a second sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; in a first sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off; and in a second sub-period of the second period, controlling the first to twelfth switch modules to be switched off.
In one possible design, an alternating cycle includes a first period and a second period, the first period is after the second period, an anode of the first power battery pack and an anode of the second power battery pack are connected, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module, and if a voltage of the second power battery pack is greater than a voltage of the first power battery pack, the first switch module and the second switch module are controlled, including: in a first sub-period of a second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off; controlling the first to twelfth switch modules to be switched off in a second sub-period of the second period; controlling one or more of the second switch module, the fourth switch module and the sixth switch module and one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on and controlling other switch modules except for the turned-on switch module to be turned off in a first sub-period of the first period; and in the second sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be switched on, and controlling other switch modules except the switched-on switch module to be switched off.
In a fourth aspect, the present application provides a heating control device comprising a processor coupled to a memory, the processor being configured to execute a computer program stored in the memory to cause the heating control device to perform a method as set forth in any one of the above-mentioned third aspects.
In a fifth aspect, the present application provides a chip, which includes a processor and a communication interface, where the processor can read instructions through the communication interface to perform a method corresponding to any one of the designs in the third aspect.
In a sixth aspect, the present application provides a computer-readable storage medium storing program code, which when executed on a computer causes the computer to perform a method corresponding to any one of the designs of the third aspect.
In a seventh aspect, the present application provides a computer program product for implementing a method according to any one of the designs of the third aspect when the computer program product runs on a processor.
In an eighth aspect, the present application provides an electric vehicle including a heating control system as set forth in any one of the second aspect.
For the beneficial effects of the third aspect to the eighth aspect, please specifically refer to the technical effects that can be achieved by the corresponding designs in the first aspect and the second aspect, which are not repeated herein.
Drawings
Fig. 1 schematically illustrates an application scenario of an electric vehicle according to an embodiment of the present application;
FIG. 2 illustrates an architecture diagram of one possible heating control system provided in the industry;
FIG. 3 is a schematic diagram illustrating a power battery pack apparatus according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating an architecture of a heating control system provided in an embodiment of the present application;
fig. 5 is a schematic flow chart illustrating a heating control method provided in one embodiment of the present application;
fig. 6 is a schematic diagram illustrating an architecture of a heating control system provided in the second embodiment of the present application;
fig. 7 is a schematic diagram illustrating a circuit for controlling heating by three windings according to a second embodiment of the present application;
fig. 8 is a schematic circuit diagram schematically illustrating a heating control by two windings according to a second embodiment of the present application;
fig. 9 is a schematic circuit diagram schematically illustrating a heating control by one winding according to the second embodiment of the present application;
fig. 10 is a schematic circuit diagram schematically illustrating another heating control by three windings according to the second embodiment of the present application;
Fig. 11 is a schematic diagram illustrating another circuit for controlling heating by two windings according to the second embodiment of the present application;
fig. 12 is a schematic diagram illustrating another circuit for controlling heating by a winding according to the second embodiment of the present application;
fig. 13 is a schematic diagram illustrating an architecture of a heating control system provided in a third embodiment of the present application;
fig. 14 is a schematic circuit diagram illustrating a heating control by three windings according to a third embodiment of the present application;
fig. 15 is a schematic diagram illustrating a circuit for controlling heating by two windings according to a third embodiment of the present application;
fig. 16 is a schematic diagram illustrating a circuit for controlling heating by a winding according to a third embodiment of the present application;
fig. 17 is a schematic circuit diagram schematically illustrating another heating control by three windings according to the third embodiment of the present application;
FIG. 18 is a schematic diagram illustrating another circuit for controlling heating by two windings according to the third embodiment of the present application;
fig. 19 is a schematic circuit diagram schematically illustrating another heating control by one winding according to the third embodiment of the present application.
Detailed Description
The scheme disclosed by the application can be applied to terminal equipment using the power battery pack as a power energy source, and is particularly suitable for terminal equipment using the lithium-ion power battery pack as a power energy source. Wherein, the terminal device can be an intelligent device using a power battery pack, including but not limited to: smart home devices such as televisions, floor sweeping robots, smart table lamps, sound systems, smart lighting systems, appliance control systems, home background music, home theater systems, intercom systems, video surveillance, and the like; intelligent transportation equipment, such as electric automobile, electric ship, electric unmanned aerial vehicle, electric train, electric truck, and electric truckEtc.; intelligent manufacturing equipment such as robots, industrial equipment, intelligent logistics, intelligent factories, and the like. Alternatively, the terminal device may be a computer device using a power battery pack, such as a desktop computer, a personal computer, a server, or the like. It should also be understood that the terminal device may also be a portable electronic device using a power battery pack, such as a mobile phone, a tablet computer, a palm top computer, a headset, a stereo, a wearable device (such as a smart watch), an in-vehicle device, a virtual reality device, an augmented reality device, and the like. Examples of portable electronic devices include, but are not limited to, a dock
Figure BDA0003509569810000121
Or other operating system. The portable electronic device may also be a device such as a Laptop computer (Laptop) with a touch sensitive surface (e.g., a touch panel), etc.
In a specific application scenario, the scheme disclosed by the application can be applied to an electric vehicle, which is also called a new energy vehicle and is a vehicle driven by electric energy. Fig. 1 schematically illustrates an application scenario of an electric vehicle according to an embodiment of the present application, in this example, an electric vehicle 10 mainly includes a main controller 111, a power battery pack 112, a Motor Controller Unit (MCU) 113, a motor 114, and wheels 12. The power battery pack 112 is a high-capacity and high-power storage battery, and specifically may be a storage battery using lithium ions as a battery material, which is referred to as a lithium battery for short. The main controller 111 may also be referred to as a vehicle controller. When the electric vehicle 10 runs, under the control of the main controller 111, the power battery pack 112 may supply power to the motor 114 through the motor controller 113, and then the motor 114 converts the electric energy provided by the power battery pack 112 into mechanical energy, so as to drive the wheels 12 to rotate, thereby implementing the running of the vehicle.
At present, the optimum working temperature of a lithium battery is about 20 ℃, and when the ambient temperature is low, the lithium battery faces a series of problems, mainly including but not limited to: (1) At low temperature, the activity of the positive electrode material of the battery core of the lithium battery is reduced, so that the quantity of lithium ions moving in the battery core is reduced, and the capacity of the lithium battery is lost; (2) At low temperature, the electrolyte in the lithium battery is solidified, so that the diffusion movement capability of charged ions in the positive and negative electrode materials of the battery core is deteriorated, the electric energy transmission speed is reduced, and the discharge speed of the lithium battery is reduced; (3) At low temperature, the crystal lattices of the cell negative electrode material of the lithium battery shrink, the lithium ions are difficult to be embedded, and the charging speed of the lithium battery is reduced. Therefore, in designing an electric vehicle, it is necessary and important for the electric vehicle how to heat the power battery pack efficiently and quickly in a low-temperature environment.
At present, a heating device is usually disposed around a power battery pack in the industry, and when an electric vehicle is started, the heating device is driven to heat the power battery pack to an optimal working temperature before the power battery pack is driven to discharge. However, this method needs to additionally provide a heating device in the electric vehicle, which not only increases the cost and the occupied space of the electric vehicle, but also increases the design difficulty of the electric vehicle, and is not favorable for the installation layout of the electric vehicle.
To solve the above problems, the present application contemplates heating a power battery pack using a high-frequency pulse current. The high-frequency pulse current is a current which generates a strong magnetic beam with polarity changing instantly in a loop by frequently switching the current flowing direction, when the high-frequency pulse current exists in the power battery pack, the strong magnetic beam can penetrate through the whole power battery pack, a large eddy current is generated in the power battery pack in the direction opposite to the direction of the high-frequency pulse current, and then joule heat is generated under the resistance action of the power battery pack, so that the temperature of the power battery pack is rapidly increased, and the power battery pack is effectively and rapidly heated.
Fig. 2 schematically illustrates a possible heating control system architecture provided in the industry, and as shown in fig. 2, in this example, the heating control system 11 includes a main controller 111, a motor controller 113, a power battery pack 112, a motor switch module 115 connected in parallel to two ends of the power battery pack 112, and a motor 114 connected to an ac terminal of the motor switch module 115, where the motor 114 is specifically a three-phase motor. The motor switch module 115 may be a three-phase rectifier bridge, and the first dc terminal b of the three-phase rectifier bridge 1 Connecting the power battery pack 112I.e. the end indicated by "+", the second dc end b of the three-phase rectifier bridge 2 Is connected with the cathode (i.e. the end indicated by "-" in the figure) of the power battery pack 112 and the first alternating current end a of the three-phase rectifier bridge 1 Connecting the first end of the winding U of the three-phase motor 114 with the second AC end a of the three-phase rectifier bridge 2 Connecting the first end of the winding V of the three-phase motor 114 to the third AC end a of the three-phase rectifier bridge 3 The first end of winding W in three-phase motor 114 is connected, and the second end of winding U, the second end of winding V and the second end of winding W in three-phase motor 114 are connected.
With continued reference to FIG. 2, when it is desired to heat the power battery pack 112, the main controller 111 can turn on or off the switch module K in the motor switch module 115 through the motor controller 113 1 ～K 6 A loop is formed among the anode of the power battery pack 112, the motor switch module 115, the winding U, the winding V and the winding W in the three-phase motor 114, and the cathode of the power battery pack 112, and the electric energy output by the anode of the power battery pack 112 is transmitted in a certain direction in the loop in the first half of a cycle and transmitted in the opposite direction in the loop in the second half of the cycle. For example, in one example: in the first half of one cycle, the main controller 111 controls the switch module K 1 Switch module K 3 And a switch module K 6 Turn on and control other switch modules to turn off, so that the electric energy discharged from the anode of the power battery pack 112 can pass through the turned-on switch module K 1 Supplied to the winding U and through the conducting switch module K 3 Is provided to the winding V, then passes through the winding W and the conducting switch module K after the winding U and the second end of the winding V are combined into one circuit 6 Flows back to the cathode of the power cell stack 112; on the contrary, in the latter half of one cycle, the main controller 111 controls the switch module K 2 And a switch module K 4 And a switch module K 5 Turn on and control other switch modules to turn off, so that the electric energy discharged from the anode of the power battery pack 112 can pass through the turned-on switch module K 5 Is supplied to the winding W, is then divided into two paths at the second end of the winding W and is supplied to the winding U and the winding V, and flows out of the winding UElectric energy through the switched-on switch module K 2 The electric energy flowing back to the cathode of the power battery 112 and flowing out from the winding V passes through the conducted switch module K 4 Back to the cathode of the power cell stack 112. By this control method, the current direction in the loop changes during the first half and the second half of each cycle, so that a high-frequency pulse current can be formed in the loop, and the high-frequency pulse current generates heat through the internal resistance of the power battery pack 112 itself, thereby heating the power battery pack 112.
With the heating control system as illustrated in fig. 2, although the power battery pack can be heated by using high-frequency pulse current, in the case where there is a difference in the direction of current flowing through at least one winding and the other windings among the three windings of the three-phase motor 114, the magnetic field in the three-phase motor 114 is asymmetric, so that q-axis current (also referred to as direct-axis current or longitudinal-axis current, which refers to current generated on a shaft of the motor coinciding with a magnetic pole axis) is inevitably generated in the three-phase motor 114, and the q-axis current further generates torque on the motor shaft of the three-phase motor 114, which is not favorable for maintaining the life of the three-phase motor 114, and even directly burns out the three-phase motor 114 in a severe case.
In view of the above, embodiments of the present disclosure provide a power battery pack apparatus, which forms a loop between two power battery packs, and generates a high-frequency pulse current in the loop by using alternate charging and discharging between the two power battery packs, so as to ensure consistent current directions on windings of a motor while heating the power battery packs by using the high-frequency pulse current, avoid generating a q-axis current as much as possible, and effectively maintain the life of the motor.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments.
It should be noted that the terms "system" and "network" in the embodiments of the present application may be used interchangeably. "plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. "one or more of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, one or more of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
And, unless specifically stated otherwise, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not limit the priority or importance of the plurality of objects. For example, the first power battery pack and the second power battery pack are only for distinguishing different power battery packs, and do not indicate a difference in priority, importance, or the like of the power battery packs.
[ EXAMPLES ] A method for producing a semiconductor device
Fig. 3 schematically illustrates a structure of a power battery pack apparatus according to a first embodiment of the present disclosure, as shown in fig. 3, in this example, the power battery pack apparatus 30 includes a first battery unit 310 and a second battery unit 320, the first battery unit 310 includes a first power battery pack 311, a first switch module 312 and a first energy storage module 313, and a first dc terminal (a) of the first switch module 312 11 ) The anode (shown as "+") of the first power battery 311 and the second DC terminal (a) of the first switch module 312 are connected 12 ) The cathode (shown as "-") of the first power battery 311, the ac terminal (a) of the first switch module 312 are connected 13 ) Is connected with the first end (b) of the first energy storage module 313 11 ). Correspondingly, the second battery unit 320 includes a second power battery pack 321, a second switch module 322 and a second energy storage module 323, and the first dc terminal (a) of the second switch module 322 21 ) The anode of the second power battery 321 and the second DC terminal (a) of the second switch module 322 are connected 22 ) The cathode of the second power battery 321 and the AC terminal (a) of the second switch module 322 are connected 23 ) Is connected with the first end (b) of the second energy storage module 323 21 ). And, the first energy storage module 31 3 second end (b) 12 ) And a second terminal (b) of the second energy storage module 323 22 ) In this connection, the first power battery 311 and the second power battery 321 may be connected at their anodes (also referred to as common anodes) as illustrated in fig. 3 a, or may be connected at their cathodes (also referred to as common cathodes) as illustrated in fig. 3B.
Illustratively, the connection between any two components can be achieved in various ways, for example, in one example, the second end b of the first energy storage module 313 12 And a second terminal b of the second energy storage module 323 22 May be implemented by a cable or a relay, and the connection of the anode of the first power battery group 311 and the anode of the second power battery group 321, or the connection of the cathode of the first power battery group 311 and the cathode of the second power battery group 321 may be implemented by a cable. Because the cable and the relay belong to common devices with lower cost, the related devices in the two battery units are connected through the cable and the relay, and the cost of circuit design can be reduced while a loop between the two battery units is constructed. Of course, if the cost is not considered, the connection of the ports may also be implemented by other components or combinations of components that can implement the function of electrical connection, which is not specifically limited in this embodiment of the present application.
For example, the first switch module 312 and the second switch module 322 may be any component or combination of components capable of performing on and off functions. For example, in one example, the first switch module 312 and/or the second switch module 322 may include a three-phase rectifier bridge, and the rectifier tubes in the three-phase rectifier bridge may be switch modules with anti-parallel diodes, such as Insulated Gate Bipolar Transistors (IGBTs) with anti-parallel diodes, silicon carbide (SIC) or other types of switch tubes, and the like. In this example, by using the three-phase rectifier bridge as the switch module, not only can the switching function of the switch module be realized, but also the stability of the current waveform in the battery unit and the utilization rate of the electric energy can be improved by the unique rectifying and filtering function of the three-phase rectifier bridge.
For example, the first energy storage module 313 and the second energy storage module 323 can be any component or combination of components that can perform the energy storage function. For example, in one example, the first energy storage module 313 and/or the second energy storage module 323 may include three-phase windings, which may be, in particular, three-phase windings in an electric machine, such as the three-phase windings in the electric machine 114 of the electric vehicle 10 illustrated in fig. 1. And, when the first energy storage module 313 and the second energy storage module 323 both include three-phase windings, the two three-phase windings may belong to a three-phase motor, a six-phase motor, or a motor having two three-phase windings, and the neutral points (corresponding to the second ends of the energy storage modules) of the two three-phase windings in the motor are connected. In this example, by using the motor inherent in the electric vehicle as the energy storage module in the power battery pack device, the power battery pack device can be realized by using the inherent device in the electric vehicle, and meanwhile, the additional device is avoided, which is beneficial to saving the circuit cost and space.
In the first embodiment, two battery units are arranged and connected with a relevant node (including the second end b of the first energy storage module 313) between the two battery units 12 And a second end b of the second energy storage module 323 22 And the anode of the first power battery pack 311 and the anode of the second power battery pack 321, or the cathode of the first power battery pack 311 and the cathode of the second power battery pack 321), a loop can be formed between the two battery cells, and a high-frequency pulse current can be formed in the loop by the alternate discharge of the two power battery packs of the two battery cells, so that the power battery pack can be efficiently and rapidly heated by using heat generated when the high-frequency pulse current passes through the internal resistance of the power battery pack. It can be seen that, by adopting the power battery pack device in the first embodiment, only the relevant nodes between the two battery units need to be connected through cables or relays, and no extra heating device is needed, so that the cost and the occupied space are reduced, the complexity of circuit design is reduced, each winding of the energy storage module can be enabled to have the same current direction, and then q-axis current can be prevented from being generated in the energy storage module as much as possible, and the service life of the energy storage module is effectively maintained. In addition, two power battery packs are arranged, and When the power battery pack of one battery unit fails, the power battery pack of the other battery unit can be switched to discharge in time, so that the function of equipment using the power battery pack device can be smoothly realized through the redundancy backup of the power battery pack.
Based on the first embodiment, the heating control scheme in the present application is briefly described below.
Taking the power battery pack apparatus 30 illustrated in fig. 3 (B) as an example, fig. 4 shows a schematic structural diagram of a heating control system provided in an embodiment of the present disclosure, as shown in fig. 4, the heating control system includes a control device 40 and the power battery pack apparatus 30, a cathode of a first power battery pack 311 in the power battery pack apparatus 30 is connected to a cathode of a second power battery pack 321, and the control device 40 is connected to a first switch module 312 and a second switch module 322 in the power battery pack apparatus 30. When the power battery pack needs to be heated, the control device 40 may control the on and off of the switch modules in the first switch module 312 and the second switch module 322 to realize the alternate discharge between the first power battery pack 311 and the second power battery pack 321: when first power battery 311 discharges, the discharged electrical energy follows V in the illustrated loop 1 Direction (or V) 2 Direction) to the second power battery pack 321 to effect charging of the second power battery pack 321; when the second power battery 321 is discharged, the discharged electrical energy follows V in the loop 2 Direction (or V) 1 Direction) to the first power battery pack 311 to effect charging of the first power battery pack 311. In this way, the first power battery pack 311 and the second power battery pack 321 are controlled to alternately discharge to each other, so that a high-frequency pulse current can be generated in the loop, and the first power battery pack 311 and the second power battery pack 321 are heated by the high-frequency pulse current.
Further, assuming that the first energy storage module 313 and the second energy storage module 323 each include a three-phase winding in the electric machine, fig. 5 exemplarily illustrates a flow chart of a heating control method provided by the embodiment of the present application, which is applicable to the control device 40 illustrated in fig. 4, as shown in fig. 5, and the method includes:
step 501, the control device determines that a power battery pack needs to be heated, and then obtains battery parameters and motor parameters.
Illustratively, with continued reference to fig. 4, the control device 40 may include a main controller 410, a battery manager 420, and a motor controller 430, where the battery manager 420 and the motor controller 430 are respectively connected to the main controller 410, the battery manager 420 is further connected to the first power battery pack 311 and the second power battery pack 321, and the motor controller 430 is further connected to the first switching module 312, the second switching module 322, the first energy storage module 313, and the second energy storage module 323.
In a possible scenario, in cold weather, before the driver starts the electric vehicle, an instruction to heat the power battery pack may be sent to the main controller 410 through a vehicle liquid crystal panel or a key on a vehicle key. The main controller 410, upon receiving the command, determines that the power battery pack is to be heated, and may send a first get command to the battery manager 420 and a second get command to the motor controller 430. The battery manager 420 acquires battery parameters of each power battery pack according to the first acquisition instruction, and sends the acquired battery parameters to the main controller 410, wherein the battery parameters of any power battery pack may include, but are not limited to: state of charge (SOC) of the power battery pack (also referred to as a remaining capacity indicating a ratio of a remaining capacity of the power battery pack after being used for a period of time or left unused for a long period of time to a capacity of its full charge state), a current temperature of the power battery pack, and the like. Accordingly, the motor controller 430 obtains the motor parameter of each energy storage module according to the second obtaining instruction, and sends the obtained motor parameter to the main controller 410, where the motor parameter of any energy storage module may include, but is not limited to, an operating state of the energy storage module, and the operating state is used to indicate whether the energy storage module is currently operating, that is, whether the electric vehicle is being driven to run.
Step 502, the control device determines whether the battery parameters and the motor parameters meet preset heating conditions, if not, step 503 is executed, and if yes, step 504 is executed.
Illustratively, the preset heating condition may include one or more of the following conditions one to three:
the method comprises the following steps that firstly, the sum of electric quantity of a power battery pack is higher than the electric quantity required for starting the electric automobile;
the current temperature of the power battery pack is lower than a preset temperature threshold, the preset temperature threshold is used for indicating the highest temperature of the power battery pack in a low-temperature state, and the lowest temperature in a temperature range capable of basically exerting the discharge performance of the power battery pack or a temperature slightly lower than the lowest temperature can be set as an exemplary temperature, such as 0 ℃ or below 0 ℃;
and under the third condition, the energy storage modules do not operate.
Assuming that the preset heating conditions include the above-mentioned conditions one to three, after receiving the battery parameters of each power battery pack sent by the battery manager 420 and the motor parameters of each energy storage module sent by the motor controller 430, the main controller 410 may perform the following determination: acquiring the charge state of each power battery pack contained in the battery parameters of each power battery pack, multiplying the charge state by the rated electric quantity of the power battery pack to obtain the residual electric quantity of the power battery pack, and further judging whether the sum of the residual electric quantities of the two power battery packs is larger than the electric quantity required by starting the electric automobile or not; acquiring the current temperature of each power battery pack contained in the battery parameters of each power battery pack, and judging whether the current temperature of each power battery pack is lower than a preset temperature threshold value or not; and acquiring the running state of the energy storage module contained in the motor parameter of each energy storage module, and judging whether each energy storage module does not run.
Further, when all of the above judgments are yes, it means that the motor in the electric vehicle is not running, both power battery packs in the electric vehicle are currently in a low temperature state, and the sum of the electric quantities of both power battery packs is sufficient to start the electric vehicle, in this case, the main controller 410 may determine that the battery parameter and the motor parameter satisfy the preset heating condition. On the contrary, when at least one of the above determinations is negative, for example, there may be at least one power battery pack that is not currently in a low temperature state, and therefore, the power battery pack with a proper temperature may be directly used to discharge to start the electric vehicle without additional heating, or the motor in the electric vehicle may be running, so that the energy storage function of the motor cannot be used to complete the above high-frequency pulse heating operation, or the electric quantity of two power battery packs in the electric vehicle is not enough to start the electric vehicle, so that even if the power battery packs are heated, it is meaningless, in this case, the main controller 410 may determine that the battery parameters and the motor parameters do not satisfy the preset heating conditions.
In step 503, the control device determines that an error has occurred in the process of heating the power battery pack.
In step 503, the main controller 410 may determine that the process for heating the power battery pack is in error when determining that the states of the motor and the battery do not satisfy the preset heating condition, and may end the current heating control process. So, just carry out heating control when the state at motor and battery satisfies preset heating condition, then do not carry out heating control when unsatisfying preset heating condition, can avoid meaningless heating operation, save controlling means's processing resources.
For example, the main controller 410 may also perform some other operations in case it is determined that an error has occurred in the flow of heating the power battery pack. For example, if the main controller 410 determines that at least one power battery pack is not in a low temperature state under the condition that other preset heating conditions are met, the main controller may also directly use one or more power battery packs of the at least one power battery pack to discharge electricity to the motor, so as to directly use the available power battery packs to quickly start the electric vehicle, thereby improving the starting efficiency. For another example, in the case that the sum of the power of the two power battery packs is not enough to start the electric vehicle under other preset heating conditions, even if the power of one power battery pack is transmitted to the other power battery pack, the power of the other power battery pack is not enough to drive the motor, the main controller 410 may also feed back a response message of the power shortage to the driver, so that the driver can charge the electric vehicle in time. For another example, in the case that other preset heating conditions are satisfied, if there is at least one energy storage module in operation, which usually means that the electric vehicle has started without repeatedly starting the electric vehicle, the main controller 410 may also feed back a response message to the driver that the energy storage module is working, so as to inform the driver that the current heating indication is problematic. The feedback response message may be voice broadcast, screen display, or short message notification. Therefore, different response modes are adopted in different heating scenes, so that not only can more intelligent control logic be given to the main controller, the intelligent degree of the electric automobile is improved, but also the time delay caused by the next operation of manual response can be saved.
Step 504, the control device determines the target high-frequency pulse current according to the temperature difference between the ambient temperature and the target temperature, the preset heating time, the preset temperature difference, the preset heating time, and the corresponding relationship between the high-frequency pulse current and the target high-frequency pulse current.
For example, when the current temperatures of both power battery packs are lower than the preset temperature threshold and the current temperatures of both power battery packs are different, the main controller 410 may select a target power battery pack from the two power battery packs according to the actual demand and determine the current temperature of the target power battery pack as the ambient temperature. The target power battery pack may be, for example, the power battery pack with the highest current temperature so as to heat to the target temperature as soon as possible, so as to start the electric vehicle faster, or may be the power battery pack with the largest remaining electric quantity so as to improve the cruising ability of the electric vehicle, and the like. Conversely, when the current temperatures of both power battery packs are lower than the preset temperature threshold and the current temperatures of both power battery packs are the same, the main controller 410 may determine the same current temperature as the ambient temperature.
For example, the main controller 410 may calculate a temperature difference between the ambient temperature and the target temperature, then query a corresponding relationship between a preset temperature difference, a preset heating time and the high-frequency pulse current according to the temperature difference and the preset heating time, and use the high-frequency pulse current corresponding to the temperature difference and the preset heating time obtained through the query as the target high-frequency pulse current. The target temperature, the preset heating time, the preset temperature difference, the corresponding relationship between the heating time and the high-frequency pulse current may be pre-configured in the main controller 410, and may also support user modification, or may also be indicated to the main controller 410 by being carried in the command of the heating power battery pack. For example, in one example, the target temperature may be pre-configured to a temperature that will perform best for the power battery pack, such as 20 ℃. In one example, the preset heating time may be set in different stages according to the ambient temperature, and the preset heating time of each stage may also be reduced along with the increase of the ambient temperature, for example, when the ambient temperature is below-20 ℃, the preset heating time may be set to 1min, when the ambient temperature is between-20 ℃ and-10 ℃, the preset heating time may be set to 0.5min, and when the ambient temperature is between-10 ℃ and 0 ℃, the preset heating time may be set to 0.3min, so that the time required by the heating process may be further refined, and the heating speed may be increased as much as possible in the case of implementing heating. In one example, the preset corresponding relationship between the temperature difference and the heating time and the high-frequency pulse current may be obtained through experimental verification, for example, the preset corresponding relationship may be obtained by placing the heating control system at various environmental temperatures, controlling the loop in the power battery pack device to form high-frequency pulse currents with different current frequencies and current magnitudes at each environmental temperature, recording the heating time required for heating the power battery pack at the environmental temperature to the target temperature under the high-frequency pulse currents with each current frequency and current magnitude, and finally counting the corresponding relationship between the temperature difference and the target temperature and the corresponding relationship between the high-frequency pulse currents and the heating time.
Further exemplarily, since the high-frequency pulse current includes a current frequency and a current magnitude, for the same temperature difference and preset heating duration, querying the correspondence between the preset temperature difference, the preset heating duration and the high-frequency pulse current may obtain a plurality of high-frequency pulse currents, where the current frequencies and/or the current magnitudes of any two high-frequency pulse currents in the plurality of high-frequency pulse currents are different. In this case, the main controller 410 may select one high-frequency pulse current from the plurality of high-frequency pulse currents obtained through query as a target high-frequency pulse current, the selection may be random selection, or may select the high-frequency pulse current with the maximum current frequency or the maximum current magnitude to increase the heating speed, or may select the high-frequency pulse current with the medium current frequency or the medium current magnitude to improve the heating stability, or may select the high-frequency pulse current with the maximum current frequency and the maximum current magnitude from the high-frequency pulse currents without a lithium deposition phenomenon (the lithium deposition phenomenon refers to a phenomenon that lithium ions are deposited in a low-temperature environment by a lithium battery, and the lithium deposition current of the lithium battery increases with the increase of the current frequency) to increase the heating speed as much as possible while ensuring that the capacity of the lithium battery is unchanged, and so on.
Further exemplarily, after selecting one high-frequency pulse current as the target high-frequency pulse current in the above manner, the main controller 410 may further obtain a first maximum current of the first energy storage module 313 at the current frequency of the target high-frequency pulse current, a second maximum current of the second energy storage module 323 at the current frequency of the target high-frequency pulse current, and a connection node (i.e., b illustrated in fig. 4) of the first energy storage module 313 and the second energy storage module 323 12 Or b 22 ) And if the current magnitude of the target high-frequency pulse current is larger than the minimum value of the first maximum current, the second maximum current and the third maximum current, the corresponding third maximum current means that the selected target high-frequency pulse current exceeds the maximum current capacity which can be currently supported by the power battery pack device. In this case, the main controller 410 may reselect a target high-frequency pulse current from the plurality of high-frequency pulse currents obtained by the above query, further obtain a new first maximum current and a new second maximum current based on the current frequency of the reselected target high-frequency pulse current, and perform subsequent calculation using the target high-frequency pulse current when the current magnitude of the reselected target high-frequency pulse current is not greater than the minimum value among the third maximum current, the new first maximum current, and the second maximum current. And otherwise, continuously reselecting the target high-frequency pulse current until the target high-frequency pulse current with the current size meeting the requirement is found. Thus, this example enables selection of a target high-frequency pulse current that does not exceed the current capacity of the power battery device, with which the power is heated The battery pack can effectively and quickly heat the power battery pack in a low-temperature environment and can ensure the safety of the power battery pack device.
In the above example, the first maximum current may be obtained by querying a corresponding relationship between a current frequency and a maximum current corresponding to the first energy storage module according to a current frequency of the target high-frequency pulse current, the second maximum current may be obtained by querying a corresponding relationship between a current frequency and a maximum current corresponding to the second energy storage module according to a current frequency of the target high-frequency pulse current, and the third maximum current may be determined by a material, a thickness degree, and the like of the cable used at the connection node. The two corresponding relations and the third maximum current may be counted in an experimental calibration manner after the power battery pack device is set, and may be configured in the main controller 410, and support a certain process deviation or calibration error.
And 505, controlling each switch module in the first switch module and the second switch module by the control device according to the target high-frequency pulse current so as to control the first power battery pack and the second power battery pack to discharge alternately.
In step 505, after determining the target high-frequency pulse current, the main controller 410 may generate a control signal according to the target high-frequency pulse current and send the control signal to the motor controller 430, so that the motor controller 430 controls the on and off of each switch module in the first switch module 312 and the second switch module 322 according to the control signal, and thus, the alternating discharge of the first power battery pack 311 and the second power battery pack 321 is realized. For example, the alternating discharge of the first power battery pack 311 and the second power battery pack 321 may specifically mean that the first power battery pack 311 and the second power battery pack 321 are discharged in a periodic manner, and each of the first power battery pack 311 and the second power battery pack 321 is discharged once in each period, for example, in a previous period of a period, the first power battery pack 311 is discharged and the second power battery pack 321 is charged, in a later period of the period, the second power battery pack 321 is discharged and the first power battery pack 311 is charged, or, in a previous period of a period, the second power battery pack 321 is discharged and the first power battery pack 311 is charged, and in a later period of the period, the first power battery pack 311 is discharged and the second power battery pack 321 is charged. The time length of the previous period and the time length of the next period in any cycle may be the same or different, and is not limited specifically.
In an alternative embodiment, when the first energy storage module 313 and the second energy storage module 323 are both three-phase windings in the motor, either power battery pack may be discharged through one or more of the three-phase windings, while the other power battery pack may be charged through one or more of the three-phase windings. Since the magnitude of the charging and discharging current increases with the number of windings, the main controller 410 may be preconfigured with a first current threshold and a second current threshold, the first current threshold may be exemplarily the maximum current supported by one of the experimentally calibrated three-phase windings, the second current threshold may be exemplarily the sum of the maximum current supported by two of the experimentally calibrated three-phase windings, and the first current threshold is smaller than the second current threshold, in which case, after calculating the target high-frequency pulse current, the main controller 410 may further perform the corresponding heating control operation according to one of the following satisfied branches one to three:
branch one, if the current magnitude of the target high-frequency pulse current is smaller than the first current threshold value, it means that only a relatively small current needs to be passed between the two power battery packs for charging and discharging, and one of the three-phase windings is sufficient to supply the current. In this case, in order to reduce the influence of the heating power battery pack on the service life of the windings as much as possible, the main controller 410 may control the on and off of the switch modules in the first switch module 312 and the second switch module 322 through the motor controller 430, so that the first power battery pack 311 and the second power battery pack 321 alternately discharge through one of the corresponding three-phase windings, which may be, for example, the winding with the minimum loss in the energy storage module, and thus, the flow of the target high-frequency pulse current required for the alternate discharge may be realized through one winding, and the wear degree of each winding may be balanced by reducing the number of times of using the winding with the large loss, so as to maintain the service life of the motor as much as possible.
And branch two, when the current magnitude of the target high-frequency pulse current is not less than the first current threshold and less than the second current threshold, the two power battery packs need to be charged and discharged through a relatively medium current, only one winding of the three-phase windings is not enough to supply the current, but the two windings are enough to supply the current. In this case, the main controller 410 may control the switching modules in the first switch module 312 and the second switch module 322 to be turned on and off through the motor controller 430, so that the first power battery pack 311 and the second power battery pack 321 are discharged alternately through two windings in the corresponding three-phase windings, where the two windings may be, for example, two windings with the smallest loss in the energy storage module, and thus, not only can the target high-frequency pulse current required for alternate discharge be realized through the two windings, but also the winding with the largest loss can be avoided as much as possible, so as to ensure that the motor can be used for a longer time.
And when the current magnitude of the target high-frequency pulse current is not less than the second current threshold value, the fact that charging and discharging are carried out between the two power battery packs through a relatively large current is meant, and only one or two of the three-phase windings are insufficient to supply the current, but only three of the three-phase windings are available. In this case, the main controller 410 may control the on and off of the switch modules in the first switch module 312 and the second switch module 322 through the motor controller 430, so that the first power battery pack 311 and the second power battery pack 321 alternately discharge through three corresponding windings in the three-phase windings, so as to fully utilize the maximum current capacity that the three windings can support, and meet the current rapid heating requirement.
It should be noted that, the first branch utilizes the three windings to realize heating, so that currents in the same direction exist in all the three windings, and in this case, if the currents in the three windings are also the same, q-axis currents are not generated in the energy storage module, and if the currents in the three windings are different, q-axis currents are generated in the energy storage module. And the second branch and the third branch realize heating by utilizing one or two windings, so that at least one winding in the three windings is necessarily present and current does not exist, and under the condition, q-axis current can be generated in the energy storage module.
In the above embodiment, by referring to the required target high-frequency pulse current and selecting as few windings as possible from the number of windings capable of supplying the target high-frequency pulse current to realize heating, the temperature of the power battery pack can be ensured to be heated to the target temperature within the preset heating time period, and the service frequency of the windings can be reduced as much as possible to maintain the service life of the energy storage module. In addition, the windings with different numbers participate in heating, and high-frequency pulse currents with different sizes can be correspondingly generated, so that the range of the pulse currents in the power battery pack can be expanded.
It should be understood that the above is only an alternative embodiment, and in other embodiments, the main controller 410 may also select any one of one, two or three windings to form a loop, and pass high-frequency pulse current through the loop, so as to increase the flexibility of heating control while expanding the adjustment range of the pulse current.
In addition, as to how to control the on/off of the switch module in each switch module to realize the alternate charging and discharging of the two power battery packs through one or more windings, the following embodiments two and three will be specifically described, and no description will be made herein.
In step 506, the control device determines whether the current temperature of the power battery pack is greater than or equal to the target temperature, if so, step 507 is executed, and if not, step 505 is continuously executed.
Step 507, the control device stops heating the power battery pack.
For example, in the process of heating the power battery packs, the main controller 410 may further obtain the current temperature of each power battery pack in a periodic manner, compare the current temperature of each power battery pack with the target temperature, stop heating the power battery packs once the current temperature of a certain power battery pack is found to be greater than or equal to the target temperature, and drive the motor to rotate by using the power battery pack which reaches the target temperature first, so as to start the electric vehicle as soon as possible. For example, the current temperature of each power battery pack may be collected and reported to the main controller 410 by the battery manager 420 actively according to a periodic manner, or the main controller 410 may instruct the battery manager 420 to obtain and report according to a periodic manner, which is not limited specifically.
It should be noted that the above is just one possible example of stopping the heating of the power battery pack. In another example, when the environmental temperature in step 504 corresponds to the current temperature of the target power battery pack, the main controller 410 stops heating the power battery pack only when the current temperature of the target power battery pack is greater than or equal to the target temperature, and then stops heating and drives the motor to rotate by using the target power battery pack to start the electric vehicle. It should be understood that there are many possible stopping manners, and the embodiment of the present application is not limited thereto.
By adopting the heating control scheme, the appropriate target high-frequency pulse current is selected according to the environment temperature and the target temperature, and the appropriate number of windings are selected according to the target high-frequency pulse current to form a loop, so that the alternate discharge between the two power battery packs can be realized as soon as possible under the condition that the actual through-current capacity of the power battery pack device is not exceeded, the heating of the power battery pack is further automatically realized, the heating logic has better controllability, and the power battery pack can be effectively and quickly heated in a low-temperature environment.
To further describe a specific implementation process of the heating control scheme, taking an example that the first switch module 312 and the second switch module 322 both include a three-phase rectifier bridge, and the first energy storage module 313 and the second energy storage module 323 both include three-phase windings, a specific control logic of the heating power battery pack is further described through the second embodiment and the third embodiment.
[ example two ]
Fig. 6 is a schematic diagram illustrating an architecture of a heating control system according to a second embodiment of the present disclosure, and as shown in fig. 6, the heating control system includes a control device 40 and a power battery pack device 30. Wherein, the first and the second end of the pipe are connected with each other, the power battery pack device 30 comprises a first power battery pack 311, a first switch module 312, a first energy storage module 313, a second power battery pack 321,A second switch module 322 and a second energy storage module 323, wherein the cathode of the first power battery set 311 is connected with the cathode of the second power battery set 321. The first switch module 312 includes a first three-phase rectifier bridge, the second switch module 322 includes a second three-phase rectifier bridge, the rectifier tubes in the first three-phase rectifier bridge and the second three-phase rectifier bridge are switch modules with anti-parallel diodes, such as an IGBT illustrated in fig. 6, and the IGBT is a switch module including parallel diodes and parallel transistors, and the conduction direction of the transistor is opposite to the conduction direction of the diode. The first energy storage module 313 includes a first three-phase winding including a winding U 1 Winding V 1 And a winding W 1 The second energy storage module 323 comprises a second three-phase winding including a winding U 2 Winding V 2 And a winding W 2 . The control device 40 comprises a main controller 410, and a battery manager 420 and a motor controller 430 which are connected with the main controller 410, wherein the battery manager 420 is further connected with the first power battery pack 311 and the second power battery pack 321, and the motor controller 430 is further connected with the first switch module 312, the first energy storage module 313, the second switch module 322 and the second energy storage module 323.
Further exemplary, and with continued reference to FIG. 6, a first power battery pack 311 may include a series power battery pack V 01 And a resistance R 1 The second power battery pack 321 may include a series power battery pack V 02 And a resistance R 2 . Wherein, the power battery group V 01 Anode and resistor R 1 Is connected to a first terminal of a resistor R 1 As the anode of a first power battery 311, power battery V 01 As the cathode of the first power battery 311, power battery V 02 Anode and resistor R 2 Is connected to a first terminal of a resistor R 2 As the anode of a second power battery 321, power battery V 02 As the cathode of the second power battery 321, and the power battery V 01 Cathode and power battery V 02 The cathodes of the two power batteries can be connected through a cable so as to realize the common cathode of the two power batteries. Wherein, the resistance R in the first power battery set 311 1 Or the resistor R in the second power battery 321 2 Can be used to regulate the current level in the loop, in particular the resistance R 1 Or a resistance R 2 A variable resistor may also be provided to increase flexibility in adjusting the magnitude of the current. It should be understood that in other examples, only power battery pack V may be included in first power battery pack 311 01 Without including the resistor R 1 The second power battery pack 321 may only include the power battery pack V 02 Without including the resistor R 2 This is not particularly limited in the embodiments of the present application.
For further example, and with continued reference to fig. 6, a capacitor C may also be included in the power battery assembly 30 1 And/or a capacitance C 2 Capacitor C 1 A capacitor C connected in parallel with both ends of the first power battery 311 2 Are connected in parallel across the second power cell pack 321. In the loop formed by first power battery 311 and second power battery 321, when the voltage decreases due to some unstable factors, the capacitor C 1 Or a capacitor C 2 Will discharge, when the voltage rises due to some unstable factor, the capacitor C 1 Or a capacitor C 2 Will charge, see, the capacitor C 1 Or a capacitor C 2 The voltage stabilizing circuit is used for maintaining the stability of voltage in a loop and achieving the purpose of protecting circuit devices.
Further illustratively, with continued reference to fig. 6, a first switch module K may be included in series in the first switch module 312 11 And a second switch module K 12 Third switch module K connected in series 13 And a fourth switching module K 14 And a fifth switch module K connected in series 15 And a sixth switching module K 16 The second switch module 322 may include a seventh switch module K connected in series 21 And an eighth switching module K 22 Ninth switch module K connected in series 23 And a tenth switching module K 24 And an eleventh switch module K connected in series 25 And a twelfth switch module K 26 . Wherein the first switch module K 11 With respect to the second switch module K 12 One end m of the non-series node 11 And a third switch module K 13 With respect to the fourth switch module K 14 One end m of the non-series node 13 And a fifth switch module K 15 With respect to the sixth switch module K 16 One end m of the non-series node 15 Connecting the anode of the first power battery 311, the second switch module K 12 Relative to the first switch module K 11 One end m of the non-series node 12 The fourth switch module K 14 With respect to the third switch module K 13 One end m of the non-series node 14 And a sixth switching module K 16 With respect to the fifth switch module K 15 One end m of the non-series node 16 A cathode connected to the first power battery 311, and a first switch module K 11 And a second switch module K 12 Series node a of 131 Connecting windings U of the first three-phase winding 1 The first terminal (the terminal labeled "1" in the figure), and a third switch module K 13 And a fourth switching module K 14 Series node a of 132 Connecting windings V of the first three-phase winding 1 First terminal of (1), fifth switch module K 15 And a sixth switching module K 16 Series node a of 133 Connecting windings W of the first three-phase winding 1 The first end of (a). Correspondingly, a seventh switching module K 21 With respect to the eighth switch module K 22 One end m of the non-series node 21 And a ninth switch module K 23 With respect to the tenth switch module K 24 One end m of the non-series node 23 And an eleventh switch module K 25 With respect to the twelfth switch module K 26 One end m of the non-series node 25 The anode of the second power battery 321, the eighth switch module K 22 With respect to the seventh switch module K 21 One end m of the non-series node 22 And a tenth switch module K 24 With respect to the ninth switch module K 23 One end m of the non-series node 24 And a twelfth switch module K 26 With respect to the eleventh switch module K 25 One end m of the non-series node 26 The cathode of the second power battery 321 is connected, and a seventh switching module K 21 And an eighth switching module K 22 Series node a of 231 Connecting windings U in second three-phase winding 2 The first end of (2), the ninth switch module K 23 And a tenth switching module K 24 Series node a of 232 Connecting windings V of the second three-phase winding 2 First terminal of (1), eleventh switch module K 25 And a twelfth switch module K 26 Series node a of 233 Connecting windings W of the second three-phase winding 2 The first end of (a). And, the winding U in the first three-phase winding 1 Second end (end labeled "2" in the drawing), winding V 1 Second end of and winding W 1 To form a second end b of the first energy storage module 313 12 Winding U in the second three-phase winding 2 Second end of, winding V 2 Second end of and winding W 2 Form a second end b of the second energy storage module 323 after being connected 22 A second end b of the first energy storage module 313 12 A second end b connected with the second end to form a second energy storage module 323 22 The connection is achieved by a cable or relay.
With the heating control system illustrated in fig. 6, the main controller 410 may control the switch module K through the motor controller 430 when heating the power battery pack 11 ～K 16 And a switch module K 21 ～K 26 So that the power battery pack V is turned on or off 01 Resistance R 1 Winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 Winding W 2 Resistance R 2 And power battery group V 2 One or more of them form a loop under the action of the conducted switch module, so that the current direction of the loop in the former period of a cycle is different from that in the latter period of the cycle, so as to generate high-frequency pulse current in the loop, and utilize the power battery pack V 1 And power battery group V 2 Heats the power battery pack V by Joule heat generated when the high-frequency pulse current flows 1 And power battery group V 2 。
In an alternative embodiment, the main controller 410 controls the switch module K through the motor controller 430 11 ～K 16 And a switch module K 21 ～K 26 Before the start of the operation of the device,a corresponding heating mode of the power battery pack device 30 may also be obtained, where the heating mode may be a Buck-first then-Boost mode or a Boost-first then-Buck mode, and the heating mode may be pre-configured in the main controller 410 or configured by a user, for example, the heating mode may be sent to the main controller 410 together with instructions carried by the user to heat the power battery pack. The first Buck and then Boost mode means that a control loop forms a Buck circuit (namely, output voltage is smaller than input voltage) in a previous period of a period, the control loop forms a Boost circuit (namely, output voltage is larger than input voltage) in a later period of the period, the first Boost and then Buck mode means that the control loop forms the Boost circuit in the previous period of the period, and the control loop forms the Buck circuit in the later period of the period. In this case, the battery parameters obtained by the battery manager 420 may further include the voltage of each power battery pack, and after determining the number of windings for realizing the alternate discharge according to the target high-frequency pulse current, the main controller 410 may further generate a corresponding control signal according to the number of windings, the magnitude relationship between the voltage of the first power battery pack 311 and the voltage of the second power battery pack 321, and the obtained heating mode, and send the control signal to the motor controller 430, so that the motor controller 430 controls the switch module K according to the control signal 11 ～K 16 And a switch module K 21 ～K 26 Heating the voltage of the first power battery pack 311 and the second power battery pack 321 in the corresponding heating mode according to the corresponding number of windings is achieved.
According to the above embodiment, based on the heating control system illustrated in fig. 6, the specific control logic in different cases is respectively described:
when the voltage of first power battery group 311 is greater than the voltage of second power battery group 321:
in one example, if the heating mode is Buck-Boost mode, the control signal generated by the main controller 410 is used to: controlling the switch module K during a first sub-period of a preceding period of each cycle 11 Switch module K 13 And a switch module K 15 And controlling the switching offOther switch modules except the switch module are turned off; controlling all the switch modules to be switched off in a second sub-period of the previous period of each cycle; controlling the switch module K in a first sub-period of a later period of each cycle 12 And a switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; during a second sub-period of the latter period of each cycle, the switch module K is controlled 21 Switch module K 23 And a switch module K 25 And controls the other switching modules except the conducting switching module to be turned off. The first sub-period of the previous period may refer to an on-period of the previous period, and may be specifically represented by a product of a duration of the previous period and a duty ratio corresponding to the previous period, and the second sub-period of the previous period may refer to an off-period of the previous period, and may be specifically represented by a difference between the duration of the previous period and the first sub-period of the previous period. Correspondingly, the first sub-period of the next period may refer to an on-period of the next period, and may be specifically represented by a product of a duration of the next period and a duty ratio corresponding to the next period, and the second sub-period of the next period may refer to an off-period of the next period, and may be specifically represented by a difference between the duration of the next period and the first sub-period of the next period. In addition, in the embodiment of the present application, the duration of the previous period may be the same as or different from the duration of the next period, and the duty ratio corresponding to the previous period may be the same as or different from the duty ratio corresponding to the next period, which is not specifically limited.
In the above examples, one or more may be any one of one, two, or three. In the switch control logic, the switch module K is turned on in the first sub-period of the previous period 11 Switch module K 13 And a switch module K 15 There are 3 possibilities for turning on one switch module and 3 possibilities for turning on two switch modulesThere are 1 possibility of turning on three switching modules, and thus 7 switching control manners coexist in the first sub-period of the previous period. Correspondingly, the switch module K is conducted in the first sub-period of the later period 12 Switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 Turn on the switch module K 12 Switch module K 14 And a switch module K 16 And turn on the switch module K 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for turning on the switch module K 12 And a switch module K 14 And a switch module K 16 And turn on the switch module K 21 And a switch module K 23 And a switch module K 25 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 12 Switch module K 14 And a switch module K 16 And turn on the switch module K 21 Switch module K 23 And a switch module K 25 There are 3 possibilities to turn on the switch module K 12 Switch module K 14 And a switch module K 16 And two switch modules K are turned on 21 And a switch module K 23 And a switch module K 25 There are 9 possibilities for turning on the switch module K 12 And a switch module K 14 And a switch module K 16 And turn on switch module K 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 12 And a switch module K 14 And a switch module K 16 And two switch modules K are turned on 21 And a switch module K 23 And a switch module K 25 There are 3 possibilities to turn on the switch module K 12 And a switch module K 14 And a switch module K 16 And turn on switch module K 21 Switch module K 23 And a switch module K 25 There are 3 possibilities for turning on the switch module K 12 And a switch module K 14 And a switch module K 16 And three switch modules K are turned on 21 Switch module K 23 And a switch module K 25 There are 3 possibilities for the two switch modules in (a), the switch module K is switched on 12 Switch module K 14 And a switch module K 16 And three switch modules K are turned on 21 Switch module K 23 And a switch module K 25 There are 1 possibility in the case of three switch modules in (1), and thus 49 switching control manners coexist in the first sub-period of the latter period. It can be seen that there are not less than 7 × 49=343 switching control modes in the heating control logic. It should be noted that, here, at least, the switching module K turned on in the second sub-period of the next period 21 Switch module K 23 And a switch module K 25 And one or more of the switching modules K are conducted in the first sub-period of the later period 21 Switch module K 23 And a switch module K 25 One or more of them may be different, and as to how many possibilities exist for specific different situations, they can be inferred by referring to the above contents, and this is not listed in this application.
In order to make the above heating control logic more clearly understood, the following description will exemplarily describe a specific circuit implementation of the heating control by taking an example of trying to perform heating through the same number of windings of two three-phase windings.
In this example, it is assumed that the previous period of one cycle is T 1 The duty ratio corresponding to the previous period is D 1 The latter period of one cycle is T 2 The duty ratio corresponding to the later period is D 2 Then the first subinterval of the previous interval is denoted as D 1 ×T 1 The second subinterval of the preceding interval is denoted as (1-D) 1 )×T 1 The first subinterval of the latter interval is denoted as D 2 ×T 2 The second subinterval of the latter interval is denoted as (1-D) 2 )×T 2 Based on this:
the first situation is as follows: heating by three windings
Assuming that the main controller 410 determines to use three windings for heating according to the target high-frequency pulse current, fig. 7 illustrates a schematic circuit diagram of a heating control by three windings according to the second embodiment of the present application, in which:
shown in fig. 7 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to (A) in FIG. 7, in the previous period T 1 First sub-period D of 1 ×T 1 Inner and outer switch module K 11 Switch module K 13 And a switch module K 15 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery group V 01 The discharged electric energy is divided into three paths, one path is switched through a switch module K 11 In the triode inflow winding U 1 The other path is via a switch module K 13 In the triode current-flowing winding V 1 And the other way through the switch module K 15 In the triode inflow winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, the electric energy flows out after being combined into one path through the second ends of the three windings and is divided into three paths to flow to the winding U 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Thereafter, the slave winding U 2 The electric energy flowing out is transmitted to the switch module K 21 Flows out of the anti-parallel diode in 2 The electric energy flowing out is transmitted to the switch module K 23 Out of the anti-parallel diode of (1), from the winding W 2 The electric energy flowing out is via a switch module K 25 The anti-parallel diode in the power battery pack flows out and then flows into the power battery pack V 02 And from the power cell stack V 02 Cathode flow to power battery group V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is used as a power battery pack V through three windings in each three-phase winding 02 Charging, and storing energy by three windings in each three-phase winding;
shown in FIG. 7B is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, shown with reference to (B) in FIG. 7, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in addition, the triodes in all the switch modules are turned off. In this case, since the three-phase winding of each three-phase winding is in the first sub-period D 1 ×T 1 Has stored energy therein, so that when the power battery pack V 01 After being cut off, the winding U maintains the original direction of the current based on the characteristic that the winding obstructs the current change 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 Will discharge the previously stored electric energy through the switch module K respectively 21 In anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 The anti-parallel diode in the power battery flows out and then flows into the power battery pack V 02 And from the power battery V 02 Is flowed out of the cathode and is further passed through a switch module K respectively 12 In the anti-parallel diode and switch module K 14 In anti-parallel diode and switch module K 16 The anti-parallel diode in (1) flows into the winding U 1 Winding V 1 And a winding W 1 . It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In each three-phase winding, the electric energy stored in the three windings is transferred to a power battery pack V 02 Continue to be the power battery pack V 02 Charging;
FIG. 7 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to (C) in FIG. 7, in the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer switch module K 12 And a switch module K 14 Switch module K 16 Switch module K 21 Switch module K 23 And a switch module K 25 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery pack V 02 The discharged electric energy is divided into three paths, one path passes through the switch module K 21 In the triode current-flowing winding U 2 The other path is via a switch module K 23 In the triode inflow winding V 2 And the other path is through a switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Then, the electric energy flows out after being combined into one path through the second ends of the three windings and is divided into three paths to flow to the winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Because the power battery group V 01 Is higher than the voltage of the power battery pack V 02 Thus the switch module K 11 Switch module K 13 And a switch module K 15 Is higher than the electromotive force of one end of the series node, so that the winding U is wound 1 Winding V1 and winding W 1 The electric energy flowing out can not pass through the switch module K 11 Switch module K 13 And a switch module K 15 Flow to the upper side of the figure, but pass through the switch module K respectively 12 Triode and switch module K in 14 Triode in and switch module K 16 In the triode inflow power battery group V 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy stores energy for three windings in each three-phase winding;
shown in FIG. 7 (D) is the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner circuit diagram, shown with reference to (D) in FIG. 7, at a later period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer switch module K 21 And a switch module K 23 And a switch module K 25 In which the transistor is conducting, in other switching modulesThe triode is turned off. In this case, the power battery group V 02 The discharged electric energy is divided into three paths which pass through a switch module K respectively 21 And a switch module K 23 And a switch module K 25 In the triode inflow winding U 2 Winding V 2 And a winding W 2 . And, although the power battery pack V 02 Is lower than the voltage of the power battery group V 01 Due to the winding U 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 In a first sub-period D 2 ×T 2 Has stored energy therein, so that the winding U is based on the characteristic of the winding to resist current change 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with the power battery pack V 02 The discharged electric energy is respectively transmitted through a switch module K 11 In anti-parallel diode and switch module K 13 In the anti-parallel diode and the switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 The cathode of the power battery pack V flows out to the power battery pack 02 The cathode of (1). As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 In combination with the electrical energy stored in each three-phase winding together as a power battery group V 01 And (6) charging.
It follows that, in the previous period T of one cycle 1 Power battery group V with high internal and external electric energy voltage 01 Power battery pack V with low flow direction voltage 02 The power battery unit 30 operates in Buck mode and during a period T following a cycle 2 Internal, electric energy low voltage power battery group V 02 Power battery pack V with high flow direction voltage 01 The power battery pack device 30 operates in a Boost mode. It can be seen that, during a cycle, the direction of current flow in the power battery assembly 30 changes, thereby generating a high frequency pulse current in the power battery assembly 30, which high frequency pulse current flows through the power battery V 01 And power electricityGroup V 02 In time, because the power battery pack V 01 And power battery group V 02 Generates joule heat by the action of the internal resistance, and effectively heats the power battery pack V by utilizing the joule heat 01 And power battery group V 02 。
The second situation: heating by two windings
Assuming that the main controller 410 determines to use two windings for heating according to the target high-frequency pulse current, fig. 8 illustrates a schematic circuit diagram of a heating control by two windings according to the second embodiment of the present application, in which:
shown in fig. 8 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, shown with reference to (A) in FIG. 8, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 11 And a switch module K 13 And a switch module K 15 Two switch modules are selected, the triodes in the two switch modules are conducted, and the triodes in the other switch modules are turned off. For example, as illustrated in (A) of FIG. 8, when the switch module K is turned on 13 And a switch module K 15 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 The discharged electric energy is divided into two paths, one path is through a switch module K 13 In the triode inflow winding V 1 The other path is via a switch module K 15 In the triode inflow winding W 1 Thereby storing energy in the winding V 1 And a winding W 1 In (1). Thereafter, the electrical energy passes through the winding V 1 And a winding W 1 The second end of the transformer is combined into one path and then divided into three paths to flow to a winding U 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Slave winding U 2 The electric energy flowing out is via a switch module K 21 From the anti-parallel diode in 2 The electric energy flowing out is transmitted to the switch module K 23 Out of the anti-parallel diode of (1), from the winding W 2 The electric energy flowing out is via a switch module K 25 The anti-parallel diode in the power battery pack flows out and then flows into the power battery pack V 02 And from the power cell stack V 02 Cathode flow to power battery pack V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is used as a power battery pack V through two windings in the first three-phase winding and three windings in the second three-phase winding 02 Charging, wherein energy is stored in two windings in the first three-phase winding and three windings in the second three-phase winding;
shown in (B) of FIG. 8 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Inner circuit diagram, shown with reference to (B) in FIG. 8, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in addition, the triodes in all the switch modules are turned off. In this case, due to the winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 In a first sub-period D 1 ×T 1 Has stored energy therein, so when the power battery pack V 01 After being cut off, the winding V is based on the characteristic that the winding obstructs the current change 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 Will discharge the previously stored electric energy and further pass through the switch module K respectively 21 In anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 02 And from the power battery V 02 Then respectively via the switch module K 12 In anti-parallel diode and switch module K 14 In anti-parallel diode and switch module K 16 The anti-parallel diodes of (a) flow into the first three-phase winding. As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In the power battery pack V, the electric energy stored in the two windings of the first three-phase winding and the three windings of the second three-phase winding is transferred to the power battery pack V 02 Continue to be the power battery pack V 02 Charging;
FIG. 8 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to (C) in FIG. 8, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 12 Switch module K 14 And a switch module K 16 Two switch modules are selected and arranged in a switch module K 21 Switch module K 23 And a switch module K 25 And selecting two switch modules, conducting the triodes of the four switch modules, and turning off the triodes in other switch modules. For example, as illustrated in (C) of FIG. 8, when the switch module K is turned on 12 Switch module K 16 Switch module K 23 And a switch module K 25 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 02 The discharged electric energy is divided into two paths, one path is through a switch module K 23 In the triode current-flowing winding V 2 The other path is via a switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding V 2 And a winding W 2 In (1). Thereafter, the electrical energy passes through the winding V 2 And a winding W 2 After the second end of the winding U flows to the winding U 1 And a winding W 1 Thereby storing energy in U 1 And a winding W 1 In (1). Slave winding U 1 The electric energy flowing out passes through a switch module K 12 The triode in, flows out, the winding W 1 The electric energy flowing out passes through a switch module K 16 The triodes in the power battery pack are flowed out and then are flowed into the power battery pack V together 02 The cathode of (2). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery packs V 02 The discharged electric energy stores energy for two windings in each three-phase winding;
FIG. 8 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 8, at a later period T 2 Second sub-period (1-D) 2 )×T 2 In the switch module K 21 Switch module K 23 And a switch module K 25 To select andfirst sub-period D 2 ×T 2 And the two selected same switch modules are used for switching on the triodes in the two switch modules and switching off the triodes in the other switch modules. For example, referring to the schematic diagram in FIG. 8 (D), when the switch module K is turned on 23 And a switch module K 25 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The discharged electric energy is divided into two paths which pass through a switch module K respectively 23 And a switch module K 25 In the triode current-flowing winding V 2 And a winding W 2 Then, the winding V is combined 2 And a winding W 2 Winding U 1 And a winding W 1 The discharged electric energy stored before is respectively passed through the switch module K 11 In the anti-parallel diode and switch module K 13 In the anti-parallel diode and the switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 The cathode of the power battery pack V flows out to the power battery pack 02 The cathode of (1). As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 Combining the electrical energy stored in the two windings of each three-phase winding together into a power battery V 01 And (6) charging.
Therefore, the implementation mode can realize the alternate discharge between the two power battery packs through the two windings in the three-phase windings as much as possible, and is beneficial to generating high-frequency pulse current to heat the power battery packs, reducing the use frequency of the windings and prolonging the service life of the motor as much as possible.
It should be understood that fig. 8 is only an exemplary illustration of one possible switching control method for heating by two windings, and in the embodiment of the present application, the previous period T is used 1 Switch module K capable of being selectively conducted 11 And a switch module K 13 And a switch module K 15 Of the previous period T 1 There are 3 possible switch control modes in total, namely: switch module K 11 And a switch module K 13 Or a switch module K 11 And a switch module K 15 Or openGateway module K 13 And a switch module K 15 (ii) a The switch module K can be selectively conducted in the later period 12 And a switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 Of a later period of time T 2 There are 9 possible switch control modes in total, namely: switch module K 12 Switch module K 14 And a switch module K 21 And a switch module K 23 Or a switch module K 12 And a switch module K 14 Switch module K 21 And a switch module K 25 Or a switch module K 12 And a switch module K 14 And a switch module K 23 And a switch module K 25 Or a switch module K 12 Switch module K 16 And a switch module K 21 And a switch module K 23 Or a switch module K 12 Switch module K 16 Switch module K 21 And a switch module K 25 Or a switch module K 12 And a switch module K 16 Switch module K 23 And a switch module K 25 Or a switch module K 14 And a switch module K 16 Switch module K 21 And a switch module K 23 Or a switch module K 14 Switch module K 16 Switch module K 21 And a switch module K 25 Or a switch module K 14 Switch module K 16 Switch module K 23 And a switch module K 25 . In this way, in the case of heating by two windings, in combination with the 3 switching control manners in the first period and the 9 switching control manners in the second period, there are 3 × 9=27 switching control manners in a cycle, and the main controller 410 may randomly or according to a certain rule select one of the 27 switching control manners to perform heating control under two windings, which is not particularly limited in the embodiment of the present application.
Case three: heating by means of a winding
Assuming that the main controller 410 determines to use one winding for heating according to the target high-frequency pulse current, fig. 9 schematically illustrates a circuit diagram for controlling heating through one winding according to the second embodiment of the present application, wherein:
Shown in (A) of FIG. 9 is a previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, shown with reference to (A) in FIG. 9, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 11 Switch module K 13 And a switch module K 15 One of the switch modules is selected, the triode in the switch module is turned on, and the triodes in the other switch modules are turned off. For example, as illustrated in fig. 9 (a), when the switch module K is turned on 15 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 01 The discharged electrical energy is passed through a switch module K 15 In the triode current-flowing winding W 1 Thereby storing energy in the winding W 1 In (1). Thereafter, electrical energy is passed through the winding W 1 After the second end of the winding U flows to the winding U 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Further, the slave winding U 2 The electric energy flowing out is via a switch module K 21 From the anti-parallel diode in 2 The electric energy flowing out is transmitted to the switch module K 23 Out of the anti-parallel diode of (1), from the winding W 2 The electric energy flowing out is via a switch module K 25 The anti-parallel diode in the power battery pack flows out and then flows into the power battery pack V 02 And from the power battery V 02 Cathode flow to power battery group V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is used as a power battery pack V through one winding in the first three-phase winding and three windings in the second three-phase winding 02 Charging, wherein energy is stored in one winding of the first three-phase winding and three windings of the second three-phase winding;
shown in fig. 9 (B) is the previous period T 1 Second (2)Sub-periods (1-D) 1 )×T 1 Internal circuit diagram, shown with reference to (B) in FIG. 9, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in the internal circuit, the triodes in all the switch modules are turned off. In this case, due to the winding W 1 Winding U 2 Winding V 2 And a winding W 2 In the first sub-period D 1 ×T 1 Has stored energy therein, and therefore, the winding W is based on the characteristic of the winding to resist current changes 1 Winding U 2 Winding V 2 And a winding W 2 Will discharge the previously stored electric energy and further pass through the switch module K respectively 21 In the anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 02 And from the power cell stack V 02 Then respectively via the switch module K 12 In anti-parallel diode and switch module K 14 In the anti-parallel diode and the switch module K 16 The anti-parallel diodes in (b) flow to the first three-phase winding. As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In the power battery pack V, the electric energy stored in one winding of the first three-phase winding and the three windings of the second three-phase winding is transferred 02 Continue to be the power battery pack V 02 Charging;
FIG. 9 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Inner circuit diagram, shown with reference to (C) in FIG. 9, at a later period T 2 First sub-period D of 2 ×T 2 In the switch module K 12 Switch module K 14 And a switch module K 16 One switch module is selected and is set in the switch module K 21 And a switch module K 23 And a switch module K 25 One switch module is selected, the triodes of the two switch modules are conducted, and the triodes in other switch modules are turned off. For example, as illustrated in (C) of FIG. 9, when the switch module K is turned on 14 And a switch module K 21 In the other switch module, and turns off the three poles in the other switch modulePipe timing power battery pack V 02 The discharged electrical energy is passed through a switch module K 21 In the triode inflow winding U 2 Thereby storing energy in the winding U 2 In (1). Thereafter, electrical energy is passed through the winding U 2 Second end of (3) backward flow to winding V 1 Thereby storing energy in the winding V 1 In (1). Further, the winding V 1 The electric energy flowing out passes through a switch module K 14 The triode in the power battery pack V flows into the power battery pack V after flowing out 02 The cathode of (2). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy stores energy for one winding in each three-phase winding;
shown in FIG. 9 (D) is the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner circuit diagram, shown with reference to (D) in FIG. 9, at a later period T 2 Second sub-period (1-D) 2 )×T 2 In the switch module K 21 Switch module K 23 And a switch module K 25 With the first sub-period D 2 ×T 2 And the same selected one of the switch modules turns on the transistor in the switch module and turns off the transistors in the other switch modules. For example, referring to the schematic diagram in FIG. 9 (D), when the switch module K is turned on 21 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The discharged electrical energy is passed through a switch module K 21 Inflow winding U 2 After that, the winding U is combined 2 And winding V 1 The discharged electric energy stored before passes through the switch module K 11 In the anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power cell stack V 01 The cathode of the power battery pack V flows out to the power battery pack 02 The cathode of (1). As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 Combining the electric energy stored in one winding of each three-phase winding as a power battery group V 01 And (6) charging.
Therefore, the implementation mode can realize the alternate discharge between the two power battery packs through one winding in each three-phase winding as much as possible, is favorable for generating high-frequency pulse current to heat the power battery packs, and simultaneously further reduces the use frequency of the windings and further prolongs the service life of the motor.
It should be understood that fig. 9 is only an exemplary illustration of one possible switching control method for heating by two windings, and in the embodiment of the present application, the previous period T is used 1 Switch module K capable of being selectively conducted 11 Switch module K 13 And a switch module K 15 Of the preceding period T 1 There are 3 possible switch control modes in total, namely: switch module K 11 Or a switch module K 13 Or a switch module K 15 (ii) a The switch module K can be selectively conducted in the later period 12 And a switch module K 14 And a switch module K 16 And a switch module K 21 And a switch module K 23 And a switch module K 25 Of the last period T 2 There are 9 possible switch control modes in total, namely: switch module K 12 And a switch module K 21 Or a switch module K 12 And a switch module K 23 Or a switch module K 12 And a switch module K 25 Or a switch module K 14 And a switch module K 21 Or a switch module K 14 And a switch module K 23 Or a switch module K 14 And a switch module K 25 Or a switch module K 16 And a switch module K 21 Or a switch module K 16 And a switch module K 23 Or a switch module K 16 And a switch module K 25 . In this way, in the case of heating by one winding, in combination with the 3 switching control manners in the first period and the 9 switching control manners in the second period, 3 × 9=27 switching control manners coexist in one cycle, and the main controller 410 may select one of the 27 switching control manners at random or according to a certain rule to perform heating control under one winding, which is not the case in the embodiment of the present applicationThe method is specifically defined.
In addition, it should be noted that the above cases one to three are merely to describe a specific switching control manner by taking an example of controlling the heating using the same number of windings in two three-phase windings as much as possible. In practice, the main controller may control the heating of two three-phase windings using the same or different number of windings, for example by controlling the switching module K in the first switching module 11 ～K 16 Under the condition that any plurality of windings in the three windings of the first three-phase winding are selected, the switch module K in the second switch module can be controlled 21 ～K 26 Any number of the three windings of the second three-phase winding are selected, such as three windings or two windings or one winding of the three windings of the second three-phase winding. In the embodiment of the application, not less than 343 switch control modes are available in all, the main controller can select any one of the not less than 343 switch control modes to execute heating control, so that different winding combination modes are adopted for heating, and the adjustable range of high-frequency pulse current for heating in the power battery pack device is effectively enlarged by changing the number of the winding combination modes. It should be understood that the scheme of selecting different numbers of windings for heating can be directly derived by referring to the scheme of the first to the third cases without any creative effort, and therefore, the embodiment of the present application does not list the scheme one by one.
In another example, if the heating mode is Boost-then-Buck mode, the main controller 410 generates control signals for: during a first sub-period of a preceding period of each cycle, the switch module K is controlled 12 Switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 And controls the other switch modules except the switched-on switch module to be switched off; controlling the switch module K during a second sub-period of the preceding period of each cycle 21 Switch module K 23 And a switch module K 25 And control the switch offSwitching off other switch modules except the switch-off module; controlling the switch module K in a first sub-period of a later period of each cycle 11 Switch module K 13 And a switch module K 15 And controls the other switch modules except the switched-on switch module to be switched off; and controlling all the switch modules to be switched off in a second sub-period of the later period of each cycle. In other words, compared with the control mode corresponding to the Buck-Boost mode, the control mode of the Buck-Boost mode in the last period of the first-Boost-Buck mode is adopted, and the specific control implementation logic is directly referred to fig. 7 to 9.
In addition, similar to the first Buck then Boost mode, under the condition that the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, there are no less than 343 switching control modes in the first Buck then Boost mode, and the main controller can select any one of the no less than 343 switching control modes to perform heating control in the first Buck then Boost mode, so that different winding combination modes are adopted for heating, and by changing the number of the winding combination modes, the adjustable range of the high-frequency pulse current for heating in the power battery pack device is effectively increased.
When the voltage of first power battery group 311 is lower than the voltage of second power battery group 321:
in one example, if the heating mode is Boost-then-Buck mode, the control signal generated by the main controller 410 is used to: during a first sub-period of a preceding period of each cycle, the switch module K is controlled 11 Switch module K 13 And a switch module K 15 And a switch module K 22 And a switch module K 24 And a switch module K 26 And controlling the other switch modules except the switched-on switch module to be switched off; during a second sub-period of the previous period of each cycle, the switch module K is controlled 11 Switch module K 13 And a switch module K 15 And controls the other switch modules except the switched-on switch module to be switched off; in the first sub-period of the latter period of each cycle, the switch module K is controlled 21 Switch module K 23 And a switch module K 25 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; and controlling all the switch modules to be switched off in a second sub-period of the later period of each cycle.
In the above examples, one or more may be any one of one, two, or three. In the switch control logic, the switch module K is turned on in the first sub-period of the previous period 11 Switch module K 13 And a switch module K 15 And a switch module K 22 And a switch module K 24 And a switch module K 26 Turn on the switch module K 11 Switch module K 13 And a switch module K 15 And turn on the switch module K 22 And a switch module K 24 And a switch module K 26 There are 9 possibilities for turning on the switch module K 11 And a switch module K 13 And a switch module K 15 And a switch module K is turned on 22 Switch module K 24 And a switch module K 26 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 11 Switch module K 13 And a switch module K 15 And turn on the switch module K 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities to turn on the switch module K 11 Switch module K 13 And a switch module K 15 And turn on switch module K 22 Switch module K 24 And a switch module K 26 There are 9 possibilities for turning on the switch module K 11 Switch module K 13 And a switch module K 15 Two switch modules inAnd turn on the switch module K 22 And a switch module K 24 And a switch module K 26 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 11 And a switch module K 13 And a switch module K 15 And turn on switch module K 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities to turn on the switch module K 11 And a switch module K 13 And a switch module K 15 And three switch modules K are turned on 22 Switch module K 24 And a switch module K 26 There are 3 possibilities for the condition of one of the switch modules, the switch module K being switched on 11 Switch module K 13 And a switch module K 15 And three switch modules K are turned on 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities for the two switch modules in (a), the switch module K is switched on 11 Switch module K 13 And a switch module K 15 And turn on switch module K 22 Switch module K 24 And a switch module K 26 There are 1 possibility of three switch modules in the system, and thus 49 switching control modes coexist in the first sub-period of the previous period. Correspondingly, the switch module K is switched on in the first sub-period of the later period 21 Switch module K 23 And a switch module K 25 There are 3 possibilities for turning on one switch module, 3 possibilities for turning on two switch modules, and 1 possibility for turning on three switch modules, so that 7 switch control modes coexist in the first sub-period of the previous period. It can be seen that there are not less than 49 × 7=343 switching control modes in the heating control logic. It should be noted that, here, it is not less than the switch module K turned on in the second sub-period from the previous period 11 And a switch module K 13 And a switch module K 15 And the switch module K conducted in the first sub-period of the previous period 11 And a switch module K 13 And openGateway module K 15 One or more of them may be different, and as to how many possibilities exist for specific different situations, they can be inferred by referring to the above contents, and this is not listed in this application.
In order to make the above heating control logic more clearly understood, the following description will exemplarily describe a specific circuit implementation of the heating control by taking as many as possible heating through the same number of windings of the two three-phase windings as an example.
In this example, assume that the first sub-period of the previous period is denoted as D 1 ×T 1 The second subinterval of the preceding interval is denoted as (1-D) 1 )×T 1 The first subinterval of the latter interval is denoted as D 2 ×T 2 The second sub-period of the latter period is denoted as (1-D) 2 )×T 2 Then:
the first situation is as follows: heating by three windings
Assuming that the main controller 410 determines to use three windings for heating according to the target high-frequency pulse current, fig. 10 illustrates another circuit diagram for heating control by three windings provided in the second embodiment of the present application, in which:
shown in fig. 10 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to (A) in FIG. 10, in the previous period T 1 First sub-period D of 1 ×T 1 Inner and outer switch module K 11 And a switch module K 13 Switch module K 15 Switch module K 22 Switch module K 24 And a switch module K 26 The transistor in the switch module is turned on, and the transistors in the other switch modules are turned off. In this case, the power battery group V 01 The discharged electric energy is divided into three paths, one path is switched through a switch module K 11 In the triode current-flowing winding U 1 The other path is via a switch module K 13 In the triode current-flowing winding V 1 And the other path is through a switch module K 15 In the triode inflow winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, the electric energy flows to the winding U after passing through the second ends of the three windings 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Further, the slave winding U 2 The electric energy flowing out is via a switch module K 22 From the winding V 2 The electric energy flowing out is via a switch module K 24 Flows out of the triode in the winding W 2 The electric energy flowing out is via a switch module K 26 The triodes in the battery pack flow out and then flow into the power battery pack V 01 The cathode of (2). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy stores energy for three windings in each three-phase winding;
shown in (B) of FIG. 10 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, referring to (B) in FIG. 10, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer switch module K 11 Switch module K 13 And a switch module K 15 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery group V 01 The discharged electric energy is divided into three paths, one path is switched through a switch module K 11 In the triode inflow winding U 1 The other path is via a switch module K 13 In the triode inflow winding V 1 And the other way through the switch module K 15 In the triode current-flowing winding W 1 . And, although the power battery group V 01 Is lower than the voltage of the power battery group V 02 Due to the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 In a first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with a power battery pack V 01 The discharged electric energy is respectively transmitted through a switch module K 21 In anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 02 And from the power battery V 02 The cathode of the power battery pack V flows out to the power battery pack 01 The cathode of (1). As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery pack V 01 Combining the electric energy stored in the three windings of each three-phase winding together to form a power battery pack V 02 Charging;
FIG. 10 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to (C) in FIG. 10, in the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer switch module K 21 And a switch module K 23 And a switch module K 25 The transistor in the switch module is turned on, and the transistors in the other switch modules are turned off. In this case, the power battery group V 02 The discharged electric energy is divided into three paths, one path is switched through a switch module K 21 In the triode current-flowing winding U 2 The other path is via a switch module K 23 In the triode current-flowing winding V 2 And the other way through the switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). The electrical energy then flows via the second ends of the three windings back to winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Further, the winding U 1 The electric energy flowing out passes through a switch module K 11 Is led out of the anti-parallel diode, winding V 1 The electric energy flowing out passes through a switch module K 13 Is led out of the anti-parallel diode, winding W 1 The electric energy flowing out passes through a switch module K 15 Then flows into the power battery pack V 01 By a power cell battery V 01 To the power battery group V 02 The cathode of (1). It can be seen thatA period of time T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is a power battery pack V 01 Charging, and storing energy in three windings of each three-phase winding;
FIG. 10 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner circuit diagram, shown with reference to (D) in FIG. 10, at a later time period T 2 Second sub-period (1-D) 2 )×T 2 And in the internal circuit, the triodes in all the switch modules are turned off. In this case, due to the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 In the first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 11 In anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 Respectively via the switch module K 22 In the anti-parallel diode and switch module K 24 In anti-parallel diode and switch module K 26 The anti-parallel diode in (1) flows into the winding U 2 Winding V 2 And a winding W 2 . As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 In each three-phase winding, the electric energy stored in the three windings is transferred to a power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
It follows that, in the previous period T of one cycle 1 Internal, electric energy low voltage power battery group V 01 Power battery pack V with high flow direction voltage 02 The power battery pack apparatus 30 operates in Boost mode and during a later period T of a cycle 2 Power battery group V with high internal and external electric energy voltage 02 Power battery pack V with low flow direction voltage 01 The power battery device 30 operates in Buck mode. It can be seen that, during a cycle, the direction of current flow in the power battery assembly 30 changes, thereby generating a high frequency pulse current in the power battery assembly 30, which high frequency pulse current flows through the power battery V 01 And power battery group V 02 In time, because the power battery pack V 01 And power battery group V 02 Generates joule heat by the action of the internal resistance, and effectively heats the power battery pack V by utilizing the joule heat 01 And power battery group V 02 。
The second situation: heating by two windings
Assuming that the main controller 410 determines to use two windings for heating according to the target high-frequency pulse current, fig. 11 illustrates another circuit diagram for heating control by two windings according to the second embodiment of the present application, in which:
shown in fig. 11 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, as shown in FIG. 11A, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 11 And a switch module K 13 And a switch module K 15 Two switch modules are selected from the switch module K 22 And a switch module K 24 And a switch module K 26 And selecting two switch modules, conducting the triodes in the four switch modules, and turning off the triodes in other switch modules. For example, as illustrated in fig. 11 (a), when the switch module K is turned on 11 Switch module K 13 Switch module K 22 And a switch module K 26 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 The discharged electric energy is divided into two paths, one path is through a switch module K 11 In the triode inflow winding U 1 The other path is via a switch module K 13 In the triode inflow winding V 1 Thereby storing energy in the winding U 1 And winding V 1 In (1). Then, the electric energy passes through the winding U 1 And winding V 1 After the second end of the winding U flows to the winding U 2 And a winding W 2 Thereby storing energy in the winding U 2 And a winding W 2 In (1). Further, the slave winding U 2 The electric energy flowing out is transmitted to the switch module K 22 Flows out of the triode in the winding W 2 The electric energy flowing out is transmitted to the switch module K 26 The triodes in the battery pack flow out and then flow into the power battery pack V 01 The cathode of (2). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy stores energy for two windings in each three-phase winding;
shown in FIG. 11B is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, as shown in FIG. 11 (B), in the previous period T 1 Second sub-period (1-D) 1 )×T 1 In the switch module K 11 And a switch module K 13 And a switch module K 15 With the first sub-period D 1 ×T 1 And the same two switch modules turn on the triodes in the two switch modules and turn off the triodes in the other switch modules. For example, referring to (B) in FIG. 11, when the switch module K is turned on 11 And a switch module K 13 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 01 The discharged electric energy is divided into two paths, one path is through a switch module K 11 In the triode current-flowing winding U 1 The other path is via a switch module K 13 In the triode inflow winding V 1 . And, although the power battery pack V 01 Is less than the voltage of the power battery pack V 02 Due to the winding U 1 Winding V 1 Winding U 2 And a winding W 2 In a first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding U 2 And a winding W 2 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with the power battery pack V 01 The discharged electric energy is respectively transmitted through a switch module K 21 In (1) inverse combinationDiode and switch module K 23 In the anti-parallel diode and the switch module K 25 In the anti-parallel diode current-flowing power battery pack V 02 And from the power battery V 02 The cathode of the power battery pack V flows out to the power battery pack 01 The cathode of (1). It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery pack V 01 Combining the electrical energy stored in the two windings of each three-phase winding together into a power battery V 02 Charging;
FIG. 11C shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to the diagram shown in (C) of FIG. 11, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 21 Switch module K 23 And a switch module K 25 And selecting two switch modules, conducting the triodes in the two switch modules, and switching off the triodes in the other switch modules. For example, as illustrated in (C) of FIG. 11, when the switch module K is turned on 23 And a switch module K 25 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The discharged electric energy is divided into two paths, one path is through a switch module K 23 In the triode inflow winding V 2 The other path is via a switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding V 2 And a winding W 2 In (1). Thereafter, the electrical energy passes through the winding V 2 And a winding W 2 Second end of (3) backward flow to winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Further, the winding U 1 The electric energy flowing out passes through a switch module K 11 Is led out of the anti-parallel diode, winding V 1 The electric energy flowing out passes through a switch module K 13 Is led out of the anti-parallel diode, winding W 1 The electric energy flowing out passes through a switch module K 15 Then flows into the power battery pack V 01 By a power cell battery V 01 To the cathode flowPower battery pack V 02 The cathode of (2). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is used as a power battery pack V through two windings in the second three-phase winding and three windings in the first three-phase winding 01 Charging, and storing energy by two windings in the second three-phase winding and three windings in the first three-phase winding;
shown in FIG. 11 (D) is the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 11, in the latter period T 2 Second sub-period (1-D) 2 )×T 2 And in addition, the triodes in all the switch modules are turned off. In this case, due to the winding U 1 Winding V 1 Winding W 1 Winding V 2 And a winding W 2 In the first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 11 In the anti-parallel diode and switch module K 13 In the anti-parallel diode and the switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power cell stack V 01 Then respectively via the switch module K 22 In the anti-parallel diode and switch module K 24 In anti-parallel diode and switch module K 26 The anti-parallel diode in (b) flows into the second three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 In the power battery pack V, the electric energy stored by two windings in the second three-phase winding and three windings in the first three-phase winding is transferred to the power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
Therefore, the implementation mode can realize alternate discharge between the two power battery packs through the two windings in each three-phase winding as much as possible, and is beneficial to generating high-frequency pulse current to heat the power battery packs, reducing the use frequency of the windings and prolonging the service life of the motor as much as possible.
It should be understood that fig. 11 is only an exemplary illustration of one possible switching control method for heating by two windings, and in the embodiment of the present application, the previous period T is used 1 Switch module K capable of being selectively conducted 11 Switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 Two of them, i.e. the previous period T 1 There are 9 possible switch control modes in total, namely: switch module K 11 Switch module K 13 Switch module K 22 And a switch module K 24 Or a switch module K 11 And a switch module K 13 Switch module K 22 And a switch module K 26 Or a switch module K 11 Switch module K 13 Switch module K 24 And a switch module K 26 Or a switch module K 11 And a switch module K 15 Switch module K 22 And a switch module K 24 Or a switch module K 11 Switch module K 15 And a switch module K 22 And a switch module K 26 Or a switch module K 11 Switch module K 15 And a switch module K 24 And a switch module K 26 Or a switch module K 13 Switch module K 15 And a switch module K 22 And a switch module K 24 Or a switch module K 13 Switch module K 15 Switch module K 22 And a switch module K 26 Or a switch module K 13 Switch module K 15 Switch module K 24 And a switch module K 26 (ii) a The switch module K can be selectively conducted in the later period 21 Switch module K 23 And a switch module K 25 Of the last period T 2 There are 3 possible switch control modes in total, namely: switch module K 21 And a switch module K 23 Or a switch module K 21 And a switch module K 25 Or a switch module K 23 And a switch module K 25 . In this way, in the case of heating by two windings, in combination with the 9 switching control manners in the first period and the 3 switching control manners in the second period, 9 × 3=27 switching control manners coexist in one cycle, and the main controller 410 may select one of the 27 switching control manners at random or according to a certain rule to perform heating control under two windings, which is not specifically limited in the embodiment of the present application.
Case three: heating by means of a winding
Assuming that the main controller 410 determines to use one winding for heating according to the target high-frequency pulse current, fig. 12 illustrates another circuit diagram for heating control through one winding provided in the second embodiment of the present application, in which:
shown in fig. 12 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to the diagram shown in (A) of FIG. 12, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 11 And a switch module K 13 And a switch module K 15 One switch module is selected from among the switch modules K 22 Switch module K 24 And a switch module K 26 The corresponding one of the switch modules is selected, the triodes in the two switch modules are conducted, and the triodes in the other switch modules are turned off. For example, as illustrated in fig. 12 (a), when the switch module K is turned on 13 And a switch module K 24 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 01 The discharged electric energy passes through the switch module K 13 In the triode current-flowing winding V 1 Thereby storing energy in the winding V 1 In (1). Then, the electric energy passes through the winding V 1 After the second end of the winding to the winding V 2 Thereby storing energy in the winding V 2 In (1). Further, the slave winding V 2 The electric energy flowing out is via a switch module K 24 The triodes in the battery pack flow out and then flow into the power battery pack V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period ofD 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is stored for one winding in each three-phase winding;
shown in (B) of FIG. 12 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Inner circuit diagram, shown in FIG. 12 (B), in the previous period T 1 Second sub-period (1-D) 1 )×T 1 In the switch module K 11 And a switch module K 13 And a switch module K 15 With the first sub-period D 1 ×T 1 And the same one of the switch modules is used for switching on the triode in the switch module and switching off the triodes in other switch modules. For example, referring to the diagram in FIG. 12 (B), when the switch module K is turned on 13 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 The discharged electrical energy is passed through a switch module K 13 In the triode inflow winding V 1 . And, a winding V 1 And winding V 2 In the first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, winding V 1 And winding V 2 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with a power battery pack V 01 The discharged electric energy is respectively transmitted through a switch module K 21 In anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 02 And from the power battery V 02 The cathode of the power battery pack V flows out to the power battery pack 01 The cathode of (1). It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery packs V 01 Combining the electric energy stored in one winding of each three-phase winding to form a power battery pack V 02 Charging;
FIG. 12 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Inner circuit diagram, shown with reference to (C) in FIG. 12, at a later period T 2 First sub-period D of 2 ×T 2 In the switch module K 21 And a switch module K 23 And a switch module K 25 And selecting one switch module, conducting the triode in the switch module, and switching off the triodes in other switch modules. For example, as illustrated in (C) of FIG. 12, when the switch module K is turned on 25 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The discharged electrical energy is passed through a switch module K 25 In the triode current-flowing winding W 2 Thereby storing energy in the winding W 2 In (1). Thereafter, electrical energy is passed through the winding W 2 After the second end of the winding U flows to the winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Further, the winding U 1 The electric energy flowing out passes through a switch module K 11 Is led out of the anti-parallel diode, winding V 1 The electric energy flowing out passes through a switch module K 13 Out of the anti-parallel diode of, winding W 1 The electric energy flowing out passes through a switch module K 15 Then flows into the power battery pack V 01 By a power cell battery V 01 To the power battery group V 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is used as a power battery pack V through one winding in the second three-phase winding and three windings in the first three-phase winding 01 Charging, and storing energy by one winding in the second three-phase winding and three windings in the first three-phase winding;
FIG. 12 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner circuit diagram, shown with reference to (D) in FIG. 12, at a later period T 2 Second sub-period (1-D) 2 )×T 2 And in addition, the triodes in all the switch modules are turned off. In this case, the winding W is wound 2 Winding U 1 Winding V 1 And a winding W 1 In the first sub-period D 2 ×T 2 Has stored energy therein, so that, to maintain the original direction of current, the winding W 2 Winding U 1 A windingV 1 And a winding W 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 11 In anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 Flows out to the second three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 The electric energy stored by one winding in the second three-phase winding and the three windings in the first three-phase winding is transferred to a power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
Therefore, the implementation mode can realize alternate discharge between the two power battery packs through one winding in each three-phase winding, and is beneficial to generating high-frequency pulse current to heat the power battery packs, further reducing the use frequency of the windings and further prolonging the service life of the motor.
It should be understood that fig. 12 is only an exemplary illustration of one possible switching control method for heating by one winding, and in the embodiment of the present application, the previous period T is used 1 Selectively conductive switch module K 11 Switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 Of the preceding period T 1 There are 9 possible switch control modes in total, namely: switch module K 11 And a switch module K 22 Or a switch module K 11 And a switch module K 24 Or a switch module K 11 And a switch module K 26 Or a switch module K 13 And a switch module K 22 Or a switch module K 13 And a switch module K 24 Or a switch module K 13 And a switch module K 26 Or a switch module K 15 And a switch module K 22 Or a switch module K 15 And a switch module K 24 Or a switch module K 15 And a switch module K 26 (ii) a At the later momentSwitch module K with selectively conductive sections 21 Switch module K 23 And a switch module K 25 At any one of them, i.e. the latter period T 2 There are 3 possible switch control modes in total, namely: switch module K 21 Or a switch module K 23 Or a switch module K 25 . In this way, in the case of heating by one winding, in combination with the 9 switching control manners in the first period and the 3 switching control manners in the second period, 9 × 3=27 switching control manners coexist in one cycle, and the main controller 410 may select one of the 27 switching control manners at random or according to a certain rule to perform heating control under one winding, which is not specifically limited in the embodiment of the present application.
In addition, it should be noted that the above cases one to three are merely to describe a specific switching control manner by taking an example of controlling heating using the same number of windings in two three-phase windings as much as possible. In actual operation, the main controller can control the two three-phase windings to be heated by using the same or different numbers of windings, all possible switch control modes are not less than 343, the main controller can select any one of the not less than 343 switch control modes to execute heating control, so that different winding combination modes are adopted for heating, and the adjustable range of high-frequency pulse current for heating in the power battery pack device is effectively enlarged by changing the number of the winding combination modes.
In another example, if the heating mode is Buck-Boost mode, the main controller 410 generates control signals for: controlling the switch module K during a first sub-period of a preceding period of each cycle 21 Switch module K 23 And a switch module K 25 And controls the other switch modules except the switched-on switch module to be switched off; controlling all the switch modules to be switched off in a second sub-period of the previous period of each cycle; controlling the switch module K in a first sub-period of a later period of each cycle 11 And a switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; in a second sub-period of the latter period of each cycle, the switch module K is controlled 11 And a switch module K 13 And a switch module K 15 And controls the other switching modules except the conducting switching module to be turned off. In other words, compared with the control mode corresponding to the first-Boost and then-Buck mode, the control mode of the last period of the first-Boost and then-Buck mode is adopted in the previous period of the first-Buck and then-Buck mode, and the control mode of the last-Boost and then-Buck mode is adopted in the last period of the first-Buck and then-Boost mode in the next period of the first-Buck and then-Boost mode, and specific control implementation logics refer to the above fig. 10 to 12 directly, which is not repeated in this embodiment.
In addition, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the first-Boost and second-Buck mode, there are not less than 343 switching control modes in the first-Buck and second-Boost mode, and the main controller may select any one of the not less than 343 switching control modes to perform the heating control in the first-Buck and second-Boost mode.
In the case where the voltage of the first power battery group 311 is equal to the voltage of the second power battery group 321:
when the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321, the main controller 410 may execute the corresponding heating control logic according to a case that the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, or may execute the corresponding heating control logic with reference to a case that the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321, which is not limited in particular.
In the second embodiment, by connecting the second ends of the two three-phase windings and connecting the cathodes of the two power battery packs, a loop can be formed between the cathodes of the two power battery packs and the two three-phase windings, and thus high-frequency pulse current can be conveniently generated in the loop to heat the two power battery packs.
[ EXAMPLE III ]
Fig. 13 is a schematic structural diagram illustrating a heating control system provided in the third embodiment of the present application, and as shown in fig. 13, the heating control system in this example includes a control device 40 and a power battery pack device 30. The specific structure of the control device 40 and the power battery pack device 30 can refer to the second embodiment, and the differences are as follows: the cathode of the first power battery 311 in the second embodiment is connected to the cathode of the second power battery 321, and the anode of the first power battery 311 in the third embodiment is connected to the anode of the second power battery 321.
The following describes specific control logic in different cases based on the heating control system illustrated in fig. 13:
when the voltage of first power battery group 311 is greater than the voltage of second power battery group 321:
in one example, if the heating mode is Buck-Boost mode, the control signal generated by the main controller 410 is used to: during a first sub-period of a preceding period of each cycle, the switch module K is controlled 12 Switch module K 14 And a switch module K 16 And controls the other switch modules except the switched-on switch module to be switched off; controlling all the switch modules to be switched off in a second sub-period of the previous period of each cycle; controlling the switch module K in a first sub-period of a later period of each cycle 11 Switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; during a second sub-period of the latter period of each cycle, the switch module K is controlled 22 Switch module K 24 And a switch module K 26 And controls other switching modules than the conducting switching module to turn off.
In the above examples, one or more may be any one of one, two, or three. In the above-mentioned switchIn the control logic, the switch module K is switched on in the first sub-period of the previous period 12 Switch module K 14 And a switch module K 16 There are 3 possibilities for turning on one switch module, 3 possibilities for turning on two switch modules, and 1 possibility for turning on three switch modules, so that 7 switch control modes coexist in the first sub-period of the previous period. Correspondingly, the switch module K is switched on in the first sub-period of the later period 11 Switch module K 13 And a switch module K 15 And a switch module K 22 And a switch module K 24 And a switch module K 26 Turn on the switch module K 11 Switch module K 13 And a switch module K 15 And a switch module K is turned on 22 And a switch module K 24 And a switch module K 26 There are 9 possibilities for the condition of one of the switch modules, the switch module K being turned on 11 Switch module K 13 And a switch module K 15 And turn on the switch module K 22 Switch module K 24 And a switch module K 26 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 11 Switch module K 13 And a switch module K 15 And turn on the switch module K 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities to turn on the switch module K 11 Switch module K 13 And a switch module K 15 And two switch modules K are turned on 22 And a switch module K 24 And a switch module K 26 There are 9 possibilities for turning on the switch module K 11 And a switch module K 13 And a switch module K 15 And two switch modules K are turned on 22 Switch module K 24 And a switch module K 26 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 11 And a switch module K 13 And a switch module K 15 And two switch modules K are turned on 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities to turn on the switch module K 11 And a switch module K 13 And a switch module K 15 And turn on switch module K 22 Switch module K 24 And a switch module K 26 There are 3 possibilities for turning on the switch module K 11 Switch module K 13 And a switch module K 15 And three switch modules K are turned on 22 Switch module K 24 And a switch module K 26 There are 3 possibilities for the two switch modules in (a), the switch module K is switched on 11 And a switch module K 13 And a switch module K 15 And three switch modules K are turned on 22 Switch module K 24 And a switch module K 26 There are 1 possibility in the case of three switch modules in (1), and thus 49 switching control manners coexist in the first sub-period of the latter period. It can be seen that there are not less than 7 × 49=343 switching control modes in the heating control logic. It should be noted that, here, at least, the switching module K turned on in the second sub-period of the next period 22 Switch module K 24 And a switch module K 26 And one or more of the switching modules K are conducted in the first sub-period of the later period 22 Switch module K 24 And a switch module K 26 One or more of them may be different, and as to how many possibilities exist for specific different situations, they can be inferred by referring to the above contents, and this is not listed in this application.
In order to make the above heating control logic more clearly understood, the following description will exemplarily describe a specific circuit implementation of the heating control by taking an example of trying to perform heating through the same number of windings of two three-phase windings.
In this example, assume that the first sub-period of the previous period is denoted as D 1 ×T 1 The second subinterval of the preceding interval is denoted as (1-D) 1 )×T 1 The first subinterval of the latter interval is denoted as D 2 ×T 2 The second subinterval of the latter interval is denoted as (1-D) 2 )×T 2 And then:
the first situation is as follows: heating by three windings
Assuming that the main controller 410 determines to use three windings for heating according to the target high-frequency pulse current, fig. 14 illustrates a schematic circuit diagram of a heating control by three windings according to the third embodiment of the present application, in which:
shown in fig. 14 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to (A) in FIG. 14, in the previous period T 1 First sub-period D of 1 ×T 1 Inner and outer switch module K 12 Switch module K 14 And a switch module K 16 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery pack V 01 The discharged electric energy flows into a power battery pack V 02 Then through a power cell stack V 02 The cathode of the switch is divided into three paths, one path passes through a switch module K 22 The anti-parallel diode in (1) flows into the winding U 2 The other path is via a switch module K 24 In the anti-parallel diode of (1) flows into the winding V 2 And the other way through the switch module K 26 In the anti-parallel diode flows into the winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Then, the electric energy flows out after being combined into one path through the second ends of the three windings and is divided into three paths to flow to the winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Thereafter, the slave winding U 1 The electric energy flowing out is via a switch module K 12 From the winding V 1 The electric energy flowing out is transmitted to the switch module K 14 Flows out of the triode from the winding W 1 The electric energy flowing out is via a switch module K 16 The triodes in the power battery pack flow out and then flow into the power battery packV 01 The cathode of (2). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is used as a power battery pack V through three windings in each three-phase winding 02 Charging, and storing energy by three windings in each three-phase winding;
shown in fig. 14 (B) is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Inner circuit diagram, shown in FIG. 14 (B), in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in addition, the triodes in all the switch modules are turned off. In this case, since the three-phase winding of each three-phase winding is in the first sub-period D 1 ×T 1 Has stored energy therein, so that when the power battery pack V 01 After being cut off, in order to maintain the original direction of current, the three windings in each three-phase winding can discharge the previously stored electric energy to pass through the switch module K respectively 11 In anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 The anti-parallel diode in the power battery flows out and then flows into the power battery pack V 02 And from the power battery V 02 Respectively via the switch module K 22 In anti-parallel diode and switch module K 24 In anti-parallel diode and switch module K 26 The anti-parallel diode in (1) flows out to the winding U 2 Winding V 2 And a winding W 2 . As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In each three-phase winding, the electric energy stored in the three windings is transferred to a power battery pack V 02 Continue to be the power battery pack V 02 Charging;
FIG. 14 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Inner circuit diagram, shown with reference to (C) in FIG. 14, at a later period T 2 First sub-period D of 2 ×T 2 Inner and outer switch module K 11 Switch module K 13 Switch module K 15 Switch module K 22 Switch dieBlock K 24 And a switch module K 26 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery group V 02 The discharged electric energy is divided into three paths, one path passes through the switch module K 11 In the triode current-flowing winding U 1 The other path is via a switch module K 13 In the triode current-flowing winding V 1 And the other path is through a switch module K 15 In the triode current-flowing winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, the electric energy flows out after being combined into one path through the second ends of the three windings and flows to the winding U in three paths 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Thereafter, the winding U 2 The electric energy flowing out passes through a switch module K 22 In the triode, winding V 2 The electric energy flowing out passes through a switch module K 24 The triode in, flows out, the winding W 2 The electric energy flowing out passes through a switch module K 26 The triode in the power battery pack flows out and then flows into the power battery pack V 02 The cathode of (2). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy stores energy for three windings in each three-phase winding;
FIG. 14 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 14, in the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer switch module K 22 And a switch module K 24 And a switch module K 26 The transistor in the switch module is turned on, and the transistors in the other switch modules are turned off. In this case, although the power battery V 02 Is lower than the voltage of the power battery group V 01 Due to the winding U 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 In a first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, the windingU 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with the power battery pack V 02 The electric energy discharged by the anode flows into a power battery pack V together 01 The anode of (2). Then, the power battery group V 01 The electric energy flowing out of the cathode is divided into three paths, one path of the electric energy passes through the switch module K 12 The anti-parallel diode in (2) flows into the winding U 1 The other path is via a switch module K 14 The anti-parallel diode in (1) flows into the winding V 1 And the other way through the switch module K 16 The anti-parallel diode in (1) flows into the winding W 1 . As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 Combining the electrical energy stored in the three windings of each three-phase winding together into a power battery group V 01 And (6) charging.
It follows that, in the previous period T of one cycle 1 Power battery group V with high internal and external electric energy voltage 01 Power battery pack V with low flow direction voltage 02 The power battery unit 30 operates in Buck mode and during a period T following a cycle 2 Internal, electric energy low voltage power battery group V 02 Power battery pack V with high flow direction voltage 01 The power battery pack device 30 operates in a Boost mode. It can be seen that, during a cycle, the current flow direction in the power battery pack device 30 changes, so that a high-frequency pulse current is generated in the power battery pack device 30, and the high-frequency pulse current flows through the power battery pack V 01 And power battery group V 02 In time, because of the power battery group V 01 And power battery group V 02 Generates joule heat by the action of the internal resistance, and effectively heats the power battery pack V by utilizing the joule heat 01 And power battery group V 02 。
Case two: heating by two windings
Assuming that the main controller 410 determines to use two windings for heating according to the target high-frequency pulse current, fig. 15 illustrates a schematic circuit diagram of a heating control by two windings according to the third embodiment of the present application, in which:
shown in fig. 15 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to the diagram shown in (A) of FIG. 15, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 12 Switch module K 14 And a switch module K 16 And selecting two switch modules, conducting the triodes in the two switch modules, and switching off the triodes in the other switch modules. For example, as illustrated in fig. 15 (a), when the switch module K is turned on 14 And a switch module K 16 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 The discharged electric energy flows into a power battery pack V 02 Then through a power cell stack V 02 The cathode of (A) is divided into three paths, one path is through a switch module K 22 In the anti-parallel diode flows into the winding U 2 The other path is via a switch module K 24 In the anti-parallel diode flows into the winding V 2 And the other way through the switch module K 26 In the anti-parallel diode flows into the winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Then, the electric energy flows out after being combined into one path through the second ends of the three windings and flows to the winding V in two paths 1 And a winding W 1 Thereby storing energy in the winding V 1 And a winding W 1 In (1). Thereafter, the slave winding V 1 The electric energy flowing out is via a switch module K 14 Flows out of the triode in the winding W 1 The electric energy flowing out is transmitted to the switch module K 16 The triodes in the battery pack flow out and then flow into the power battery pack V 01 The cathode of (1). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery packs V 01 The discharged electric energy is used as a power battery pack V through three windings in the second three-phase winding and two windings in the first three-phase winding 02 Charging, wherein energy is stored in three windings in the second three-phase winding and two windings in the first three-phase winding;
shown in (B) of FIG. 15 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, shown with reference to (B) in FIG. 15, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in the internal circuit, the triodes in all the switch modules are turned off. In this case, due to the winding U 2 Winding V 2 Winding W 2 Winding V 1 And a winding W 1 In a first sub-period D 1 ×T 1 Has stored energy therein, so when the power battery pack V 01 After being cut off, the winding U maintains the original direction of current 2 Winding V 2 Winding W 2 Winding V 1 And a winding W 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 11 In anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 The anti-parallel diode in the power battery pack flows out and then flows into the power battery pack V 02 And from the power battery V 02 The cathode of (2) flows out to the winding U 2 Winding V 2 And a winding W 2 . It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In the second three-phase winding and the first three-phase winding, the electric energy stored in the three windings is transferred to the power battery group V 02 Continue to be the power battery pack V 02 Charging;
FIG. 15 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to the diagram shown in (C) of FIG. 15, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 11 Switch module K 13 And a switch module K 15 Two switch modules are selected from, and in switch module K 22 And a switch module K 24 And a switch module K 26 And selecting two switch modules, conducting the triodes in the four switch modules, and turning off the triodes in other switch modules. For example, as illustrated in (C) of FIG. 15, when the switch module K is turned on 11 Switch module K 15 Switch module K 22 And a switch module K 24 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The discharged electric energy is divided into two paths, one path is through a switch module K 11 In the triode inflow winding U 1 The other path is via a switch module K 15 In the triode current-flowing winding W 1 Thereby storing energy in the winding U 1 And a winding W 1 In (1). Thereafter, electrical energy is passed through the winding U 1 And a winding W 1 The second end of the transformer is combined into one path and then flows out, and the two paths of current flow to the winding U 2 And winding V 2 Thereby storing energy in the winding U 2 And winding V 2 In (1). Further, the winding U 2 The electric energy flowing out passes through a switch module K 22 The triode in the transformer flows out, the winding V 2 Outgoing electrical energy switch module K 24 The triodes in the battery pack flow out and then flow into the power battery pack V 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is stored for two windings in each three-phase winding;
FIG. 15 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 15, in the latter period T 2 Second sub-period (1-D) 2 )×T 2 In the switch module K 22 Switch module K 24 And a switch module K 26 With the first sub-period D 2 ×T 2 And the same two switch modules are used for conducting the triodes in the two switch modules and switching off the triodes in the other switch modules. For example, as illustrated in (D) of FIG. 15, when the switch module K is turned on 22 And a switch module K 24 While the triode in the power battery pack V is turned off and the triodes in the other switch modules are turned off 02 Is less than the voltage of the power battery pack V 01 Due to the winding U 2 Winding V 2 Winding U 1 And a winding W 1 In the first sub-period D 2 ×T 2 Stored therein, and thus, for maintaining the origin of the currentDirection, winding U 2 Winding V 2 Winding U 1 And a winding W 1 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with the power battery pack V 02 The electric energy discharged by the anode flows into a power battery pack V together 01 The anode of (2). Then, the power battery group V 01 Respectively via a switch module K 12 In the anti-parallel diode and switch module K 14 In the anti-parallel diode and the switch module K 16 The anti-parallel diodes in (b) flow into the first three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 Combining the electrical energy stored in the two windings of each three-phase winding together into a power battery group V 01 And (6) charging.
Therefore, the implementation mode can realize alternate discharge between the two power battery packs through the two windings in the three-phase windings as much as possible, and is beneficial to generating high-frequency pulse current to heat the power battery packs, reducing the use frequency of the windings and prolonging the service life of the motor as much as possible.
It should be understood that fig. 15 is only an exemplary illustration of one possible switching control method for heating by two windings, and in the embodiment of the present application, the previous period T is used 1 Selectively conductive switch module K 12 Switch module K 14 And a switch module K 16 Two of them, i.e. the previous period T 1 There are 3 possible switch control modes in total, namely: switch module K 12 And a switch module K 14 Or a switch module K 12 And a switch module K 16 Or a switch module K 14 And a switch module K 16 (ii) a The switch module K can be selectively conducted in the later period 11 And a switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 Of a later period of time T 2 There are 9 possible switch control modes in total, namely: switch module K 11 And a switch module K 13 Switch module K 22 And a switch module K 24 Or a switch module K 11 Switch module K 13 Switch module K 22 And a switch module K 26 Or a switch module K 11 Switch module K 13 And a switch module K 24 And a switch module K 26 Or a switch module K 11 And a switch module K 15 And a switch module K 22 And a switch module K 24 Or a switch module K 11 And a switch module K 15 Switch module K 22 And a switch module K 26 Or a switch module K 11 Switch module K 15 Switch module K 24 And a switch module K 26 Or a switch module K 13 Switch module K 15 Switch module K 22 And a switch module K 24 Or a switch module K 13 Switch module K 15 And a switch module K 22 And a switch module K 26 Or a switch module K 13 Switch module K 15 And a switch module K 24 And a switch module K 26 . In this way, in the case of heating by two windings, in combination with the 3 switching control manners in the first period and the 9 switching control manners in the second period, there are 3 × 9=27 switching control manners in a cycle, and the main controller 410 may randomly or according to a certain rule select one of the 27 switching control manners to perform heating control under two windings, which is not particularly limited in the embodiment of the present application.
Case three: heating by means of a winding
Assuming that the main controller 410 determines to use one winding for heating according to the target high-frequency pulse current, fig. 16 schematically illustrates a circuit diagram for controlling heating through one winding according to a third embodiment of the present application, in which:
shown in (A) of FIG. 16 is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, shown with reference to (A) in FIG. 16, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 12 Switch moduleK 14 And a switch module K 16 And selecting one switch module, conducting the triode in the switch module, and switching off the triodes in other switch modules. For example, as illustrated in fig. 16 (a), when the switch module K is turned on 14 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 The discharged electric energy flows into a power battery pack V 02 Then through a power cell battery V 02 The cathode of the switch is divided into three paths, one path passes through a switch module K 22 The anti-parallel diode in (1) flows into the winding U 2 The other path is via a switch module K 24 In the anti-parallel diode of (1) flows into the winding V 2 And the other path is through a switch module K 26 The anti-parallel diode in (1) flows into the winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Then, the electric energy is combined into one path through the second ends of the three windings and flows out to the winding V 1 Thereby storing energy in the winding V 1 In (1). Thereafter, the slave winding V 1 The electric energy flowing out is transmitted to the switch module K 14 The triode in the power battery pack flows out to the power battery pack V 01 The cathode of (1). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is used as a power battery pack V through three windings in the second three-phase winding and one winding in the first three-phase winding 02 Charging, wherein energy is stored in three windings in the second three-phase winding and one winding in the first three-phase winding;
shown in fig. 16 (B) is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Inner circuit diagram, shown with reference to (B) in FIG. 16, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 And in the internal circuit, the triodes in all the switch modules are turned off. In this case, due to the winding U 2 Winding V 2 Winding W 2 And winding V 1 In the first sub-period D 1 ×T 1 Has stored energy therein, so that when the power battery pack V 01 After being cut off, the winding U maintains the original direction of current 2 A windingV 2 Winding W 2 And winding V 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 11 In the anti-parallel diode and switch module K 13 In anti-parallel diode and switch module K 15 The anti-parallel diode in the power battery pack flows out and then flows into the power battery pack V 02 And from the power cell stack V 02 To the winding U 2 Winding V 2 And a winding W 2 . As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 In the second three-phase winding and the first three-phase winding, the electric energy stored in the three windings is transferred to the power battery group V 02 Continue to be the power battery pack V 02 Charging;
FIG. 16 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to (C) in FIG. 16, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 11 And a switch module K 13 And a switch module K 15 In a switch module and in a switch module K 22 Switch module K 24 And a switch module K 26 One switch module is selected, the triodes in the two switch modules are conducted, and the triodes in the other switch modules are turned off. For example, as illustrated in (C) of FIG. 16, when the switch module K is turned on 11 And a switch module K 22 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 02 The discharged electrical energy is passed through a switch module K 11 In the triode current-flowing winding U 1 Thereby storing energy in the winding U 1 In (1). Then, the winding U 1 The electric energy flows to the winding U 2 Thereby storing energy in the winding U 2 In (1). Further, the winding U 2 The electric energy flowing out passes through a switch module K 22 The triode in the power battery pack flows out and then flows into the power battery pack V 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy isOne winding in each three-phase winding stores energy;
FIG. 16 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, shown with reference to (D) in FIG. 16, at a later period T 2 Second sub-period (1-D) 2 )×T 2 In the switch module K 22 And a switch module K 24 And a switch module K 26 With the first sub-period D 2 ×T 2 And the same one of the switch modules is used for switching on the triode in the switch module and switching off the triodes in other switch modules. For example, as illustrated in (D) of FIG. 16, when the switch module K is turned on 22 While the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 Is less than the voltage of the power battery pack V 01 Due to the winding U 2 And winding U 1 In a first sub-period D 2 ×T 2 Has stored energy therein, so that to maintain the original direction of current flow, the winding U 2 And winding U 1 Will discharge the electric energy stored previously, the electric energy discharged by the winding is combined with the power battery pack V 02 The electric energy discharged by the anode flows into a power battery pack V together 01 Of (2) an anode. Then, the power battery group V 01 Respectively via a switch module K 12 In anti-parallel diode and switch module K 14 In the anti-parallel diode and the switch module K 16 The anti-parallel diodes in (b) flow into the first three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 Inner and outer power battery pack V 02 Combining the electrical energy stored in one winding of each three-phase winding together into a power battery group V 01 And (6) charging.
Therefore, the implementation mode can realize the alternate discharge between the two power battery packs through one winding in each three-phase winding as much as possible, and is beneficial to generating high-frequency pulse current to heat the power battery packs, further reducing the use frequency of the windings and further prolonging the service life of the motor.
It should be understood that FIG. 16, described above, is exemplary onlyA possible way of controlling the switching of the heating by means of a winding is described, in the embodiment of the application, due to the previous period T 1 Selectively conductive switch module K 12 And a switch module K 14 And a switch module K 16 Of the preceding period T 1 There are 3 possible switch control modes in total, namely: switch module K 12 Or a switch module K 14 Or a switch module K 16 (ii) a The switch module K can be selectively conducted in the later period 11 Switch module K 13 And a switch module K 15 And a switch module K 22 And a switch module K 24 And a switch module K 26 Of the last period T 2 There are 9 possible switch control modes in total, namely: switch module K 11 And a switch module K 22 Or a switch module K 11 And a switch module K 24 Or a switch module K 11 And a switch module K 26 Or a switch module K 13 And a switch module K 22 Or a switch module K 13 And a switch module K 24 Or a switch module K 13 And a switch module K 26 Or a switch module K 15 And a switch module K 22 Or a switch module K 15 And a switch module K 24 Or a switch module K 15 And a switch module K 26 . In this way, in the case of heating by one winding, 3 × 9=27 switching control modes coexist in one cycle in combination with 3 switching control modes in the first period and 9 switching control modes in the second period, and the main controller 410 may select one of the 27 switching control modes at random or according to a certain rule to perform heating control under one winding, which is not specifically limited in the embodiment of the present application.
In addition, it should be noted that the above cases one to three are merely to describe a specific switching control manner by taking an example of controlling heating using the same number of windings in two three-phase windings as much as possible. In practical operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating, all possible switch control modes are not less than 343, the main controller can select any one of the not less than 343 switch control modes to execute heating control so as to adopt different winding combination modes for heating, and the adjustable range of high-frequency pulse current for heating in the power battery pack device is effectively improved by changing the number of the winding combination modes.
In another example, if the heating mode is Boost-then-Buck mode, the main controller 410 generates control signals for: during a first sub-period of a preceding period of each cycle, the switch module K is controlled 11 And a switch module K 13 And a switch module K 15 And a switch module K 22 Switch module K 24 And a switch module K 26 And controls the other switch modules except the switched-on switch module to be switched off; controlling the switch module K during a second sub-period of the preceding period of each cycle 22 Switch module K 24 And a switch module K 26 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; controlling the switch module K in a first sub-period of a later period of each cycle 12 Switch module K 14 And a switch module K 16 And controls the other switch modules except the switched-on switch module to be switched off; and controlling all the switch modules to be switched off in a second sub-period of the later period of each cycle. In other words, compared with the control mode corresponding to the Buck-Boost mode, the control mode of the Buck-Boost mode in the last period of the first-Boost-Buck mode is adopted, and the specific control implementation logic is directly referred to fig. 14 to 16.
In addition, under the condition that the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the first Buck and then Boost mode, the first Boost and then Buck mode also has at least 343 switching control modes, and the main controller can select any one of the at least 343 switching control modes to perform heating control in the first Buck and then Boost mode, so that heating is performed in different winding combination modes, and the adjustable range of the high-frequency pulse current for heating in the power battery pack device is effectively increased by changing the number of the winding combination modes.
When the voltage of the first power battery group 311 is lower than the voltage of the second power battery group 321:
in one example, if the heating mode is Boost-then-Buck mode, the control signal generated by the main controller 410 is used to: controlling the switch module K during a first sub-period of a preceding period of each cycle 12 Switch module K 14 And a switch module K 16 And a switch module K 21 And a switch module K 23 And a switch module K 25 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; controlling the switch module K during a second sub-period of the preceding period of each cycle 12 Switch module K 14 And a switch module K 16 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; controlling the switch module K in a first sub-period of a later period of each cycle 22 Switch module K 24 And a switch module K 26 And controls the other switch modules except the switched-on switch module to be switched off; and controlling all the switch modules to be switched off in a second sub-period of the latter period of each cycle.
In the above examples, one or more may be any one of one, two, or three. In the switch control logic, the switch module K is turned on in the first sub-period of the previous period 12 Switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 Turn on the switch module K 12 And a switch module K 14 And a switch module K 16 And one of the switch modules is turned onClosing module K 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for turning on the switch module K 12 And a switch module K 14 And a switch module K 16 And turn on the switch module K 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 12 And a switch module K 14 And a switch module K 16 And a switch module K is turned on 21 Switch module K 23 And a switch module K 25 There are 3 possibilities to turn on the switch module K 12 Switch module K 14 And a switch module K 16 And two switch modules K are turned on 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for turning on the switch module K 12 Switch module K 14 And a switch module K 16 And two switch modules K are turned on 21 Switch module K 23 And a switch module K 25 There are 9 possibilities for the two switch modules in (a), the switch module K is switched on 12 And a switch module K 14 And a switch module K 16 And two switch modules K are turned on 21 And a switch module K 23 And a switch module K 25 There are 3 possibilities to turn on the switch module K 12 Switch module K 14 And a switch module K 16 And turn on switch module K 21 Switch module K 23 And a switch module K 25 There are 3 possibilities for the condition of one of the switch modules, the switch module K being switched on 12 Switch module K 14 And a switch module K 16 And turn on switch module K 21 Switch module K 23 And a switch module K 25 There are 3 possibilities for the two switch modules in (a), the switch module K is switched on 12 And a switch module K 14 And a switch module K 16 Three inSwitch module and conducting switch module K 21 Switch module K 23 And a switch module K 25 There are 1 possibility in the case of three switch modules in (1), and thus 49 switching control manners coexist in the first sub-period of the previous period. Correspondingly, the switch module K is conducted in the first sub-period of the later period 22 And a switch module K 24 And a switch module K 26 There are 3 possibilities for turning on one switch module, 3 possibilities for turning on two switch modules, and 1 possibility for turning on three switch modules, so that 7 switch control modes coexist in the first sub-period of the previous period. It can be seen that there are not less than 49 × 7=343 switching control modes in the heating control logic. It should be noted that, here, at least, the switching module K turned on in the second sub-period from the previous period 12 And a switch module K 14 And a switch module K 16 And the switch module K conducted in the first sub-period of the previous period 12 Switch module K 14 And a switch module K 16 One or more of them may be different, and as to how many possibilities exist for specific different situations, they can be inferred by referring to the above contents, and this is not listed in this application.
In order to make the above heating control logic more clearly understood, the following description will exemplarily describe a specific circuit implementation of the heating control by taking an example of trying to perform heating through the same number of windings of two three-phase windings.
In this example, assume that the first sub-period of the previous period is denoted as D 1 ×T 1 The second subinterval of the preceding interval is denoted as (1-D) 1 )×T 1 The first subinterval of the latter interval is denoted as D 2 ×T 2 The second subinterval of the latter interval is denoted as (1-D) 2 )×T 2 And then:
the first situation is as follows: heating by three windings
Assuming that the main controller 410 determines to use three windings for heating according to the target high-frequency pulse current, fig. 17 illustrates another circuit diagram for heating control by three windings provided in the third embodiment of the present application, in which:
shown in (A) of FIG. 17 is a previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, as shown in FIG. 17 (A), in the previous period T 1 First sub-period D of 1 ×T 1 Inner and outer switch module K 12 And a switch module K 14 Switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 The transistor in the switch module is turned on, and the transistors in the other switch modules are turned off. In this case, the power battery group V 01 The electric energy emitted by the anode is divided into three paths, one path is divided by a switch module K 21 In the triode inflow winding U 2 The other path is via a switch module K 23 In the triode current-flowing winding V 2 And the other way through the switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Then, after the electric energy passes through the second ends of the three windings and is combined into one path, the electric energy is further divided into three paths to flow to the winding U 1 Winding V 1 And a winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Further, the slave winding U 1 The electric energy flowing out is transmitted to the switch module K 12 From the winding V 1 The electric energy flowing out is via a switch module K 14 Flows out of the triode from the winding W 1 The electric energy flowing out is via a switch module K 16 The triode in the power battery pack flows out and then flows into the power battery pack V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy is stored for three windings in each three-phase winding;
shown in (B) of FIG. 17 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, as shown in FIG. 17 (B), in the previous period T 1 Second sub-period of time(1-D 1 )×T 1 Inner and outer switch module K 12 And a switch module K 14 And a switch module K 16 The transistor in the switch module is turned on, and the transistors in the other switch modules are turned off. In this case, although the power battery pack V 01 Is lower than the voltage of the power battery group V 02 Due to the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 In the first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 Will discharge the previously stored electric energy, the electric energy discharged from the winding will pass through the switch module K 12 Triode and switch module K in 14 Triode in and switch module K 16 In the triode inflow power battery group V 01 In turn, in conjunction with the power cell set V 01 The electric energy discharged by the anode flows out to the power battery pack V 02 The anode of (2). Then, from the power battery V 02 Respectively via a switch module K 22 In anti-parallel diode and switch module K 24 In anti-parallel diode and switch module K 26 The anti-parallel diode in (1) flows into the winding U 2 Winding V 2 And a winding W 2 . As can be seen, during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery pack V 01 Combining the electrical energy stored in the three windings of each three-phase winding together into a power battery group V 02 Charging;
FIG. 17 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Inner circuit diagram, shown with reference to (C) in FIG. 17, at the latter time period T 2 First sub-period D of 2 ×T 2 Inner and outer switch module K 22 Switch module K 24 And a switch module K 26 The triode in the switch module is conducted, and the triodes in the other switch modules are turned off. In this case, the power battery group V 02 Into which electric energy discharged from the anode flowsTo power battery group V 01 Anode of (2), power battery group V 01 The electric energy flowing out of the cathode is divided into three paths, one path is through a switch module K 12 The anti-parallel diode in (1) flows into the winding U 1 The other path is via a switch module K 14 In the anti-parallel diode of (1) flows into the winding V 1 And the other path is through a switch module K 16 The anti-parallel diode in (1) flows into the winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, after the electric energy is combined into one path through the second ends of the three windings, the electric energy is divided into three paths to respectively flow to the winding U 2 Winding V 2 And a winding W 2 Thereby storing energy in the winding U 2 Winding V 2 And a winding W 2 In (1). Further, the winding U 2 The electric energy flowing out passes through a switch module K 22 Is flowing out of the triode, winding V 2 The electric energy flowing out passes through a switch module K 24 Is flowing out of the triode, winding W 2 The electric energy flowing out passes through a switch module K 26 Flows out of the triode and then flows into the power battery pack V 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is a power battery pack V 01 Charging, and storing energy in three windings of each three-phase winding;
shown in FIG. 17 (D) is the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, shown with reference to (D) in FIG. 17, at a later period T 2 Second sub-period (1-D) 2 )×T 2 And in the internal circuit, the triodes in all the switch modules are turned off. In this case, due to the winding U 1 Winding V 1 Winding W 1 Winding U 2 Winding V 2 And a winding W 2 In the first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 2 Winding V 2 Winding W 2 Winding U 1 Winding V 1 And a winding W 1 Will discharge the previously stored electric energy and further pass through the switch module K respectively 21 In (1)Anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 Then respectively via the switch module K 12 In the anti-parallel diode and switch module K 14 In the anti-parallel diode and the switch module K 16 The anti-parallel diode in (2) flows into the winding U 1 Winding V 1 And a winding W 1 . As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 In each three-phase winding, the electric energy stored in the three windings is transferred to a power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
It follows that, in the previous period T of one cycle 1 Internal, electric energy low voltage power battery group V 01 Power battery pack V with high flow direction voltage 02 The power battery unit 30 operates in Boost mode during a period T following a cycle 2 Power battery pack V with high secondary voltage and high electric energy 02 Power battery pack V with low flow direction voltage 01 The power battery device 30 operates in Buck mode. It can be seen that, during a cycle, the current flow direction in the power battery pack device 30 changes, so that a high-frequency pulse current is generated in the power battery pack device 30, and the high-frequency pulse current flows through the power battery pack V 01 And power battery group V 02 In time, because the power battery pack V 01 And power battery group V 02 Generates joule heat by the action of the internal resistance, and effectively heats the power battery pack V by utilizing the joule heat 01 And power battery group V 02 。
Case two: heating by two windings
Assuming that the main controller 410 determines to use two windings for heating according to the target high-frequency pulse current, fig. 18 illustrates another circuit diagram for heating control by two windings provided in the third embodiment of the present application, wherein:
shown in fig. 18 (a) is the previous period T 1 First one of (1)Period D 1 ×T 1 Internal circuit diagram, referring to the diagram shown in (A) of FIG. 18, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 12 Switch module K 14 And a switch module K 16 Two switch modules are selected from the switch module K 21 Switch module K 23 And a switch module K 25 And selecting two switch modules, conducting the triodes in the four switch modules, and turning off the triodes in other switch modules. For example, as illustrated in fig. 18 (a), when the switch module K is turned on 12 Switch module K 14 Switch module K 21 And a switch module K 25 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 01 The electric energy emitted by the anode is divided into two paths, one path is through a switch module K 21 In the triode current-flowing winding U 2 The other path is via a switch module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding U 2 And a winding W 2 In (1). Thereafter, electrical energy is passed through the winding U 2 And a winding W 2 After the second end of the transformer is closed into one path, the current is divided into two paths to flow to a winding U 1 And winding V 1 Thereby storing energy in the winding U 1 And winding V 1 In (1). Further, the slave winding U 1 The electric energy flowing out is via a switch module K 12 From the winding V 1 The electric energy flowing out is transmitted to the switch module K 14 The triodes in the battery pack flow out and then flow into the power battery pack V 01 The cathode of (1). As can be seen, during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery pack V 01 The discharged electric energy stores energy for two windings in each three-phase winding;
shown in (B) of FIG. 18 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, referring to (B) in FIG. 18, in the previous period T 1 Second sub-period (1-D) 1 )×T 1 In the switch module K 12 Switch module K 14 And a switch module K 16 Is selected from the firstSub-period D 1 ×T 1 And the same two switch modules are used for conducting the triodes in the two switch modules and switching off the triodes in the other switch modules. For example, referring to (B) in FIG. 18, when the switch module K is turned on 12 And a switch module K 14 While the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 Is less than the voltage of the power battery pack V 02 Due to the winding U 1 Winding V 1 Winding U 2 And a winding W 2 In the first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding U 2 And a winding W 2 Will discharge the previously stored electric energy, the electric energy discharged from the winding will pass through the switch module K respectively 12 Triode and switch module K in 14 In the triode inflow power battery group V 01 In turn, in conjunction with the power cell set V 01 The discharged electric energy flows out to a power battery pack V together 02 Of (2) an anode. Then, the power battery group V 02 Respectively via a switch module K 22 In the anti-parallel diode and switch module K 24 In anti-parallel diode and switch module K 26 The anti-parallel diodes in (b) flow to the second three-phase winding. It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery pack V 01 Combining the electrical energy stored in the two windings of each three-phase winding together into a power battery group V 02 Charging;
FIG. 18 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to the diagram shown in (C) of FIG. 18, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 22 And a switch module K 24 And a switch module K 26 Two switch modules are selected, the triodes in the two switch modules are conducted, and the triodes in the other switch modules are turned off. For example, as illustrated in (C) of FIG. 18, when the switch module K is turned on 22 And switchModule K 24 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 02 The electric energy discharged by the anode flows into a power battery pack V 01 Anode of (2), power battery group V 01 The electric energy flowing out of the cathode is divided into three paths, one path is through a switch module K 12 The anti-parallel diode in (1) flows into the winding U 1 The other path is via a switch module K 14 In the anti-parallel diode of (1) flows into the winding V 1 And the other way through the switch module K 16 The anti-parallel diode in (1) flows into the winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, after the electric energy is combined into one path through the second ends of the three windings, the electric energy is divided into two paths to respectively flow to the winding U 2 And winding V 2 Thereby storing energy in the winding U 2 And winding V 2 In (1). Further, the winding U 2 The electric energy flowing out passes through a switch module K 22 Is flowing out of the triode, winding V 2 The electric energy flowing out passes through a switch module K 24 Flows out of the triode and then flows into the power battery pack V 02 The cathode of (2). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery packs V 02 The discharged electric energy is a power battery pack V 01 Charging, and storing energy in three windings of the first three-phase winding and two windings of the second three-phase winding;
FIG. 18 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 18, at a later period T 2 Second sub-period (1-D) 2 )×T 2 And switching off the triodes in all the switch modules. In this case, due to the winding U 1 Winding V 1 Winding W 1 Winding U 2 And winding V 2 In a first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding W 1 Winding U 2 And winding V 2 Will discharge the previously stored electric energy and further pass through the switch module K respectively 21 In the anti-parallel diode and switch module K 23 In the anti-parallel diode and the switch module K 25 In the anti-parallel diode current-flowing power battery pack V 01 And from the power cell stack V 01 Then respectively via the switch module K 12 In the anti-parallel diode and switch module K 14 In the anti-parallel diode and the switch module K 16 To the first three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 In the power battery pack V, the electric energy stored by three windings in the first three-phase winding and two windings in the second three-phase winding is transferred to the power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
Therefore, the implementation mode can realize alternate discharge between the two power battery packs through the two windings in each three-phase winding as much as possible, and is beneficial to generating high-frequency pulse current to heat the power battery packs, reducing the use frequency of the windings and prolonging the service life of the motor as much as possible.
It should be understood that fig. 18 is only an exemplary illustration of one possible switching control method for heating by two windings, and in the embodiment of the present application, the previous period T is used 1 Selectively conductive switch module K 12 And a switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 Two of them, i.e. the previous period T 1 There are 9 possible switch control modes in total, namely: switch module K 12 Switch module K 14 Switch module K 21 And a switch module K 23 Or a switch module K 12 Switch module K 14 And a switch module K 21 And a switch module K 25 Or a switch module K 12 And a switch module K 14 And a switch module K 23 And a switch module K 25 Or a switch module K 12 Switch module K 16 Switch module K 21 And a switch module K 23 Or a switch module K 12 Switch moduleK 16 Switch module K 21 And a switch module K 25 Or a switch module K 12 And a switch module K 16 Switch module K 23 And a switch module K 25 Or a switch module K 14 And a switch module K 16 And a switch module K 21 And a switch module K 23 Or a switch module K 14 And a switch module K 16 And a switch module K 21 And a switch module K 25 Or a switch module K 14 Switch module K 16 Switch module K 23 And a switch module K 25 (ii) a The switch module K can be selectively conducted in the later period 22 And a switch module K 24 And a switch module K 26 Of a later period of time T 2 There are 3 possible switch control modes in total, namely: switch module K 22 And a switch module K 24 Or a switch module K 22 And a switch module K 26 Or a switch module K 24 And a switch module K 26 . In this way, in the case of heating by two windings, in combination with the 9 switching control manners in the first period and the 3 switching control manners in the second period, 9 × 3=27 switching control manners coexist in one cycle, and the main controller 410 may randomly or according to a certain rule select one of the 27 switching control manners to perform heating control under two windings, which is not particularly limited in the embodiment of the present application.
Case three: heating by means of a winding
Assuming that the main controller 410 determines to use one winding for heating according to the target high-frequency pulse current, fig. 19 schematically illustrates another circuit diagram for heating control by one winding provided in the third embodiment of the present application, wherein:
shown in fig. 19 (a) is the previous period T 1 First sub-period D of 1 ×T 1 Internal circuit diagram, referring to (A) in FIG. 19, in the previous period T 1 First sub-period D of 1 ×T 1 In the switch module K 12 Switch module K 14 And a switch module K 16 One switch module is selected from among the switch modules K 21 Switch module K 23 And a switch module K 25 One switch module is selected, the triodes in the two switch modules are conducted, and the triodes in the other switch modules are turned off. For example, as illustrated in (A) of FIG. 19, when the switch module K is turned on 12 And a switch module K 25 When the triode in the power battery pack V is switched off and the triodes in other switch modules are switched off 01 Via a switching module K 25 In the triode inflow winding W 2 Thereby storing energy in the winding W 2 In (1). The electrical energy then passes through the winding W 2 Second end of (3) backward flow to winding U 1 Thereby storing energy in the winding U 1 In (1). Further, the slave winding U 1 The electric energy flowing out is via a switch module K 12 The triode in the power battery pack flows into the power battery pack V after flowing out 01 The cathode of (2). It can be seen that during the previous time period T 1 First sub-period D of 1 ×T 1 Inner and outer power battery packs V 01 The discharged electric energy stores energy for one winding in each three-phase winding;
shown in (B) of FIG. 19 is the previous period T 1 Second sub-period (1-D) 1 )×T 1 Internal circuit diagram, as shown in FIG. 19 (B), in the previous period T 1 Second sub-period (1-D) 1 )×T 1 In the switch module K 12 And a switch module K 14 And a switch module K 16 With the first sub-period D 1 ×T 1 And the same one of the switch modules is used for switching on the triode in the switch module and switching off the triodes in other switch modules. For example, refer to (B) in FIG. 19, when the switch module K is turned on 12 While the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 01 Is lower than the voltage of the power battery group V 02 But due to the winding W 2 And winding U 1 In the first sub-period D 1 ×T 1 Having stored energy therein, so that, to maintain the original direction of current flow, winding W 2 And winding U 1 Will discharge the electric energy stored previously and the electric energy discharged by the windingVia a switch module K 12 In the triode inflow power battery group V 01 In combination with a power battery V 01 The discharged electric energy flows out to a power battery pack V together 02 The anode of (2). Then, the power battery group V 02 Respectively via a switch module K 22 In anti-parallel diode and switch module K 24 In the anti-parallel diode and the switch module K 26 The anti-parallel diodes in (b) flow into the second three-phase winding. It can be seen that during the previous time period T 1 Second sub-period (1-D) 1 )×T 1 Inner and outer power battery packs V 01 Combining the electrical energy stored in one winding of each three-phase winding together into a power battery group V 02 Charging;
FIG. 19 (C) shows the latter period T 2 First sub-period D of 2 ×T 2 Internal circuit diagram, referring to (C) in FIG. 19, in the latter period T 2 First sub-period D of 2 ×T 2 In the switch module K 22 Switch module K 24 And a switch module K 26 And selecting one switch module, conducting the triode in the switch module, and switching off the triodes in other switch modules. For example, as illustrated in (C) of FIG. 19, when the switch module K is turned on 24 When the triode in the power battery pack V is turned off and the triodes in other switch modules are turned off 02 The electric energy discharged by the anode flows into a power battery pack V 01 Anode of (2), power battery group V 01 The electric energy flowing out of the cathode is divided into three paths, one path is through a switch module K 12 The anti-parallel diode in (1) flows into the winding U 1 The other path is via a switch module K 14 In the anti-parallel diode flows into the winding V 1 And the other way through the switch module K 16 The anti-parallel diode in (1) flows into the winding W 1 Thereby storing energy in the winding U 1 Winding V 1 And a winding W 1 In (1). Then, the electric energy flows to the winding V after being combined into one path through the second ends of the three windings 2 Thereby storing energy in the winding V 2 In (1). Further, the winding V 2 The electric energy flowing out passes through a switch module K 24 Of the triodeFlows into the power battery pack V after flowing out 02 The cathode of (1). As can be seen, during the latter period T 2 First sub-period D of 2 ×T 2 Inner and outer power battery pack V 02 The discharged electric energy is used as a power battery pack V through three windings of the first three-phase winding and one winding of the second three-phase winding 01 Charging, wherein energy is stored in three windings of the first three-phase winding and one winding of the second three-phase winding;
FIG. 19 (D) shows the latter period T 2 Second sub-period (1-D) 2 )×T 2 Internal circuit diagram, referring to (D) in FIG. 19, in the latter period T 2 Second sub-period (1-D) 2 )×T 2 And switching off the triodes in all the switch modules. In this case, due to the winding U 1 Winding V 1 Winding W 1 And winding V 2 In a first sub-period D 2 ×T 2 Having stored energy therein, so that, to maintain the original direction of current flow, the winding U 1 Winding V 1 Winding W 1 And winding V 2 Will discharge the previously stored electric energy and further pass through the switch module K respectively 21 In anti-parallel diode and switch module K 23 In anti-parallel diode and switch module K 25 In the anti-parallel diode current-flowing power battery pack V 01 And from the power battery V 01 Then respectively via the switch module K 12 In anti-parallel diode and switch module K 14 In anti-parallel diode and switch module K 16 The anti-parallel diodes in (b) flow into the first three-phase winding. As can be seen, during the latter period T 2 Second sub-period (1-D) 2 )×T 2 In the power battery pack V, the electric energy stored by three windings in the first three-phase winding and one winding in the second three-phase winding is transferred to the power battery pack V 01 Continue to be the power battery pack V 01 And (6) charging.
Therefore, the implementation mode can realize alternate discharge between the two power battery packs through one winding in each three-phase winding, and is beneficial to generating high-frequency pulse current to heat the power battery packs, further reducing the use frequency of the windings and further prolonging the service life of the motor.
It should be understood that fig. 19 is only an exemplary illustration of one possible switching control method for heating by one winding, and in the embodiment of the present application, the previous period T is used 1 Switch module K capable of being selectively conducted 12 Switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 Of the preceding period T 1 There are 9 possible switch control modes in total, namely: switch module K 12 And a switch module K 21 Or a switch module K 12 And a switch module K 23 Or a switch module K 12 And a switch module K 25 Or a switch module K 14 And a switch module K 21 Or a switch module K 14 And a switch module K 23 Or a switch module K 14 And a switch module K 25 Or a switch module K 16 And a switch module K 21 Or a switch module K 16 And a switch module K 23 Or a switch module K 16 And a switch module K 25 (ii) a The switch module K can be selectively conducted in the later period 22 Switch module K 24 And a switch module K 26 Of the last period T 2 There are 3 possible switch control modes in total, namely: switch module K 22 Or a switch module K 24 Or a switch module K 26 . In this way, in the case of heating by one winding, in combination with the 9 switching control manners in the first period and the 3 switching control manners in the second period, 9 × 3=27 switching control manners coexist in one cycle, and the main controller 410 may select one of the 27 switching control manners at random or according to a certain rule to perform heating control under one winding, which is not specifically limited in the embodiment of the present application.
In addition, it should be noted that the above cases one to three are merely to describe a specific switching control manner by taking an example of controlling heating using the same number of windings in two three-phase windings as much as possible. In practical operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating, and the number of all possible switching control modes is not less than 343, and the main controller can select any one of the not less than 343 switching control modes to execute heating control.
In another example, if the heating mode is Buck-Boost mode, the main controller 410 generates control signals for: controlling the switch module K during a first sub-period of a preceding period of each cycle 22 And a switch module K 24 And a switch module K 26 One or more of the switch modules are switched on, and other switch modules except the switched-on switch module are controlled to be switched off; controlling all the switch modules to be switched off in a second sub-period of the previous period of each cycle; controlling the switch module K in a first sub-period of a later period of each cycle 12 Switch module K 14 And a switch module K 16 And a switch module K 21 Switch module K 23 And a switch module K 25 And controls the other switch modules except the switched-on switch module to be switched off; in a second sub-period of the latter period of each cycle, the switch module K is controlled 12 And a switch module K 14 And a switch module K 16 And controls the other switching modules except the conducting switching module to be turned off. In other words, compared with the control mode corresponding to the first-Boost-then-Buck mode, the control mode of the first-Boost-then-Buck mode in the previous period of the first-Buck-then-Boost mode is adopted, the control mode of the first-Boost-then-Buck mode in the next period of the first-Buck-then-Boost mode is adopted, specific control implementation logic is directly referred to the above fig. 17 to 19, and details of the control implementation are not repeated one by one in the embodiment of the present application.
In addition, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the first-Boost then-Buck mode, there are no less than 343 switching control modes in the first-Buck then-Boost mode, and the main controller may select any one of the no less than 343 switching control modes to perform heating control in the first-Buck then-Boost mode.
In the case where the voltage of the first power battery group 311 is equal to the voltage of the second power battery group 321:
when the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321, the main controller 410 may execute the corresponding heating control logic according to a case that the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, or may execute the corresponding heating control logic with reference to a case that the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321, which is not limited specifically.
In the third embodiment, by connecting the second ends of the two three-phase windings and connecting the anodes of the two power battery packs, a loop can be formed between the anodes of the two power battery packs and the two three-phase windings, and thus high-frequency pulse current can be conveniently generated in the loop to heat the two power battery packs.
It should be understood that the second embodiment and the third embodiment are only described by taking IGBTs as the switching modules, in practical operation, the switching modules may also be other modules with antiparallel diodes, and accordingly, the control logic may refer to the above contents directly, and the embodiments of the present application are not limited to this specifically.
According to the scheme provided by the embodiment of the application, the application also provides an electric automobile which comprises the heating control system.
According to an aspect provided by an embodiment of the present application, there is also provided a computer program product, including: computer program code which, when run on a computer, causes the computer to carry out the method as performed by the control device described above.
According to an aspect provided by the embodiment of the present application, a computer-readable storage medium is further provided, where the computer-readable storage medium stores program codes, and when the program codes are executed on a computer, the computer is enabled to implement the method executed by the control device.
According to the solution provided by the embodiment of the present application, the present application further provides an electronic device, where the electronic device includes a processor, and the processor is connected to the memory, and is used to execute the computer program stored in the memory, so that the electronic device implements the method performed by the control apparatus.
As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

1. A power battery pack apparatus, comprising:
a first battery cell and a second battery cell;
the first battery unit comprises a first power battery pack, a first switch module and a first energy storage module, wherein a first direct current end of the first switch module is connected with an anode of the first power battery pack, a second direct current end of the first switch module is connected with a cathode of the first power battery pack, and an alternating current end of the first switch module is connected with a first end of the first energy storage module;
the second battery unit comprises a second power battery pack, a second switch module and a second energy storage module, wherein a first direct current end of the second switch module is connected with an anode of the second power battery pack, a second direct current end of the second switch module is connected with a cathode of the second power battery pack, and an alternating current end of the second switch module is connected with a first end of the second energy storage module;
The second end of the first energy storage module is connected with the second end of the second energy storage module;
the anode of the first power battery pack is connected with the anode of the second power battery pack, or the cathode of the first power battery pack is connected with the cathode of the second power battery pack;
the first energy storage module comprises a first three-phase winding, and second ends of three windings in the first three-phase winding are connected to form a second end of the first energy storage module; the second energy storage module comprises a second three-phase winding, and second ends of three windings in the second three-phase winding are connected to form a second end of the second energy storage module.
2. The apparatus of claim 1,
the first switch module comprises a first three-phase rectifier bridge;
and the first ends of three windings in the first three-phase winding are connected with three alternating current ends of the first three-phase rectifier bridge.
3. The apparatus of claim 2,
the second switch module comprises a second three-phase rectifier bridge;
and the first ends of three windings in the second three-phase winding are connected with three alternating current ends of the second three-phase rectifier bridge.
4. The apparatus of claim 3, wherein the first three-phase winding and the second three-phase winding satisfy one of the following conditions:
The first three-phase winding and the second three-phase winding are two three-phase motors;
the first three-phase winding and the second three-phase winding belong to a six-phase motor;
alternatively, the first and second electrodes may be,
the first three-phase winding and the second three-phase winding belong to a motor with two sets of independent three-phase windings.
5. The apparatus of any of claims 2 to 4, wherein the rectifying tubes in the first three-phase rectifying bridge and/or the second three-phase rectifying bridge are switching modules with anti-parallel diodes.
6. The apparatus of claim 5,
the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, the first switch module and the second switch module are connected in series, the third switch module and the fourth switch module are connected in series, the fifth switch module and the sixth switch module are connected in series, the first switch module is connected in series with respect to a non-series node end of the second switch module, the third switch module is connected in series with respect to a non-series node end of the fourth switch module, and the fifth switch module is connected with an anode of the first power battery pack respectively with respect to a non-series node end of the sixth switch module, the second switch module is connected with a cathode of the first power battery pack respectively with respect to a non-series node end of the first switch module, the fourth switch module is connected with respect to a non-series node end of the third switch module, and the sixth switch module is connected with respect to a non-series node end of the fifth switch module, and the first switch module and the third switch module, the third switch module and the sixth switch module are connected with a cathode of the first power battery pack respectively;
The second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module, the seventh switch module and the eighth switch module are connected in series, the seventh switch module is respectively connected with the anode of the second power battery pack relative to the non-series node end of the eighth switch module, the non-series node end of the ninth switch module relative to the tenth switch module and the non-series node end of the eleventh switch module relative to the twelfth switch module, the eighth switch module is respectively connected with the cathode of the second power battery pack relative to the non-series node end of the seventh switch module, the non-series node end of the tenth switch module relative to the ninth switch module and the non-series node end of the twelfth switch module relative to the eleventh switch module, and the series node of the seventh switch module and the eighth switch module, the winding module and the ninth switch module, the series node of the twelfth switch module and the twelfth switch module are respectively connected with the three-phase nodes of the twelfth switch module.
7. A heating control system, comprising control means and a power battery pack arrangement according to any one of claims 1 to 6;
the control device is used for:
through controlling first switch module and second switch module, control first power battery group and second power battery group and discharge in turn, the electric quantity that first power battery group emitted does second power battery group charges, the electric quantity that second power battery group emitted does first power battery group charges.
8. The system of claim 7, wherein the first energy storage module and the second energy storage module comprise motors, the control device comprises a main controller, a battery manager, and a motor controller, the battery manager is connected to the main controller, the first power battery pack, and the second power battery pack, respectively, and the motor controller is connected to the main controller, the first switching module, the second switching module, the first energy storage module, and the second energy storage module, respectively;
the battery manager is used for acquiring the charge state and the current temperature of each power battery pack;
the motor controller is used for acquiring the working state of each energy storage module;
The main controller is further used for determining that the sum of the electric quantity of each power battery pack is enough to start the electric vehicle according to the charge state of each power battery pack, determining that each power battery pack is in a low-temperature state according to the current temperature of each power battery pack, and generating a control signal and sending the control signal to the motor controller after determining that each energy storage module does not work according to the working state of each energy storage module;
and the motor controller is used for controlling the first power battery pack and the second power battery pack to alternately discharge by controlling the on and off of each switch module in the first switch module and the second switch module according to the control signal.
9. The system of claim 7, wherein the control device is specifically configured to:
determining a target high-frequency pulse current according to the temperature difference between the environment temperature and the target temperature, the preset heating time and the corresponding relation among the preset temperature difference, the preset heating time and the high-frequency pulse current;
when the target high-frequency pulse current is smaller than a first current threshold value, controlling the first power battery pack and the second power battery pack to alternately discharge through one winding of the corresponding three-phase windings by controlling the first switch module and the second switch module;
When the target high-frequency pulse current is not smaller than the first current threshold and smaller than a second current threshold, controlling the first power battery pack and the second power battery pack to alternately discharge through two windings in the corresponding three-phase windings by controlling the first switch module and the second switch module;
when the target high-frequency pulse current is not smaller than the second current threshold, the first power battery pack and the second power battery pack are controlled to alternately discharge through three windings in the corresponding three-phase windings by controlling the first switch module and the second switch module.
10. The system according to claim 9, wherein in the case where the temperature difference and the preset heating period correspond to a plurality of high-frequency pulse currents in the preset correspondence relationship of the temperature difference, the heating period, and the high-frequency pulse currents:
the control device is further configured to:
selecting the target high-frequency pulse current from the plurality of high-frequency pulse currents;
acquiring a first maximum current of the first three-phase winding at a frequency corresponding to the target high-frequency pulse current, a second maximum current of the second three-phase winding at a frequency corresponding to the target high-frequency pulse current, and a third maximum current corresponding to a connection node of the first three-phase winding and the second three-phase winding;
And if the target high-frequency pulse current is larger than the minimum value of the first maximum current, the second maximum current and the third maximum current, reselecting the target high-frequency pulse current from the plurality of high-frequency pulse currents.
11. The system of any one of claims 7 to 10, wherein an alternating cycle comprises a first period and a second period, the first period following the second period or the first period preceding the second period;
under the condition that the cathode of the first power battery pack is connected with the cathode of the second power battery pack, the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module:
if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically configured to:
controlling one or more of the first, third and fifth switching modules to be turned on and other switching modules except the turned-on switching module to be turned off during a first sub-period of the first period;
In a second sub-period of the first period, controlling the first to twelfth switch modules to be turned off;
during a first sub-period of the second period, controlling one or more of the second, fourth and sixth switching modules and one or more of the seventh, ninth and eleventh switching modules to be turned on and controlling other switching modules except the turned-on switching module to be turned off;
and in a second sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off.
12. The system of any one of claims 7 to 10, wherein an alternating cycle comprises a first period of time and a second period of time, the first period of time being after the second period of time or the first period of time being before the second period of time;
under the condition that the cathode of the first power battery pack is connected with the cathode of the second power battery pack, the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module:
If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically configured to:
controlling one or more of the first, third, and fifth switching modules and one or more of the eighth, tenth, and twelfth switching modules to be turned on and other switching modules except the turned-on switching module to be turned off during a first sub-period of the first period;
during a second sub-period of the first period, controlling one or more of the first, third and fifth switch modules to be turned on and other switch modules except the turned-on switch module to be turned off;
in a first sub-period of the second period, controlling one or more of the seventh switch module, the ninth switch module and the eleventh switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off;
and in a second sub-period of the second period, controlling the first to twelfth switch modules to be turned off.
13. The system of any one of claims 7 to 10, wherein an alternating cycle comprises a first period of time and a second period of time, the first period of time being after the second period of time or the first period of time being before the second period of time;
under the condition that the anode of the first power battery pack is connected with the anode of the second power battery pack, the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module:
if the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically configured to:
in a first sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be turned on, and controlling other switch modules except the turned-on switch module to be turned off;
controlling the first to twelfth switch modules to be turned off in a second sub-period of the first period;
During a first sub-period of the second period, controlling one or more of the first, third and fifth switch modules and one or more of the eighth, tenth and twelfth switch modules to be turned on and other switch modules except the turned-on switch module to be turned off;
and in a second sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except for the turned-on switch module to be turned off.
14. The system of any one of claims 7 to 10, wherein an alternating cycle comprises a first period and a second period, the first period following the second period or the first period preceding the second period;
under the condition that the anode of the first power battery pack is connected with the anode of the second power battery pack, the first switch module comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module comprises a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module:
If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically configured to:
during a first sub-period of the first period, controlling one or more of the second, fourth and sixth switch modules and one or more of the seventh, ninth and eleventh switch modules to be turned on and controlling other switch modules except the turned-on switch module to be turned off;
during a second sub-period of the first period, controlling one or more of the second switch module, the fourth switch module and the sixth switch module to be turned on, and controlling other switch modules except for the turned-on switch module to be turned off;
during a first sub-period of the second period, controlling one or more of the eighth switch module, the tenth switch module and the twelfth switch module to be turned on, and controlling other switch modules except for the turned-on switch module to be turned off;
and in a second sub-period of the second period, controlling the first to twelfth switch modules to be turned off.
15. An electric vehicle characterized by comprising the heating control system according to any one of claims 7 to 14.
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