CN113119802A - Vehicle, energy conversion device, and control method therefor - Google Patents
Vehicle, energy conversion device, and control method therefor Download PDFInfo
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- CN113119802A CN113119802A CN201911416237.7A CN201911416237A CN113119802A CN 113119802 A CN113119802 A CN 113119802A CN 201911416237 A CN201911416237 A CN 201911416237A CN 113119802 A CN113119802 A CN 113119802A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims abstract description 154
- 238000004146 energy storage Methods 0.000 claims abstract description 95
- 238000007599 discharging Methods 0.000 claims description 117
- 230000007935 neutral effect Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 238000010586 diagram Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 7
- 230000027311 M phase Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- 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
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- 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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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Inverter Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The technical scheme of the application provides a vehicle, energy conversion device and control method thereof, energy conversion device includes machine controller, bus capacitor, first switch module, including a motor, an end cap, a controller, and a cover plate, the second switch module, energy storage capacitor and control module, through controlling switching on of first switch module and second switch module, can make machine controller, bus capacitor, first switch module, including a motor, an end cap, a controller, and a cover plate, the second switch module, energy storage capacitor forms charge-discharge circuit, battery package and bus capacitor discharge and the energy storage capacitor charges bus capacitor and battery package and then realize the intensification of battery package through the discharge of battery package and bus capacitor to energy storage capacitor and the charging of energy storage capacitor to bus capacitor and battery package when machine controller control charge-discharge circuit work, the heating efficiency of battery package.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a vehicle, an energy conversion apparatus, and a control method thereof.
Background
With the wide use of new energy, the battery pack can be used as a power source to be applied to various fields. The battery pack is used as a power source in different environments, and the performance of the battery pack is also affected. For example, the performance of the battery pack in a low-temperature environment is greatly reduced from that at normal temperature. For example, the discharge capacity of the battery pack at the zero point temperature may decrease as the temperature decreases. The discharge capacity of the battery pack was substantially 0 at-30 c, resulting in the battery pack being unusable. In order to enable the battery pack to be used in a low-temperature environment, it is necessary to preheat the battery pack before using the battery pack.
As shown in fig. 1, in the prior art, a motor controller 101, a motor 102, and a battery pack 103 are included, when the battery pack 103 is in a discharging process, a transistor VT1 and a transistor VT6 in the motor controller 101 are triggered to be turned on at the same time, a current flows from a positive electrode of the battery pack 103, returns to a negative electrode of the battery pack 103 through a transistor VT1, a transistor VT6, and two stator inductors of the motor 102, the current rises, and energy is stored in the two stator inductors; when the battery pack 103 is in the charging process, as shown in fig. 2, the transistor VT1 and the transistor VT6 are simultaneously turned off, and the current returns to the battery pack 102 from the two stator inductances of the motor 102, the motor controller 101 through the two bleeder diodes VD4 and VD3, and the current drops. The two processes are repeated, the battery is in a rapid charging and discharging alternating state, and due to the existence of the internal resistance of the battery, a large amount of heat is generated inside the battery, and the temperature is rapidly increased. However, the prior art has the following problems: due to the bus capacitor C1, a large amount of current passes through the bus capacitor C1 when the battery pack 103 discharges in the working process of the charge-discharge loop, so that the current flowing through the battery pack is greatly reduced, and the heating speed of the battery pack is seriously slowed.
Disclosure of Invention
The application aims to provide a vehicle, an energy conversion device and a control method of the energy conversion device, wherein a bus capacitor can participate in a charging process and a discharging process in a charging and discharging loop by controlling a motor controller, and then the heating speed of a battery pack is increased.
The present application is achieved as the first aspect provides an energy conversion apparatus comprising:
the first ends of all paths of bridge arms of the motor controller are connected together to form a first junction end, and the second ends of all paths of bridge arms of the motor controller are connected together to form a second junction end;
a first end of the bus capacitor is connected with the first bus end, and a second end of the bus capacitor is respectively connected with the second bus end and the cathode of the battery pack;
a first switch module connected between a positive electrode of the battery pack and the first bus bar terminal;
the coils of the motor are respectively connected with the middle points of the bridge arms of the motor controller;
a second switch module, a first end of the second switch module being connected to a neutral point of a coil of the motor;
an energy storage capacitor connected between the second end of the second switch module and the second bus bar end;
the control module is used for controlling the first switch module and the second switch module to be conducted so that the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the energy storage capacitor form a charging and discharging loop, and controlling the motor controller to adjust a current value flowing through the charging and discharging loop so as to adjust heat generated by internal resistance of the battery pack.
A second aspect of the present application provides a control method of the energy conversion apparatus according to the first aspect, the control method including:
and controlling the first switch module and the second switch module to be conducted so that the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the energy storage capacitor form a charge-discharge loop, and controlling the motor controller to adjust the current value flowing through the charge-discharge loop so as to adjust the heat generated by the internal resistance of the battery pack.
A third aspect of the present application provides a vehicle including the energy conversion apparatus of the first aspect.
The technical scheme of the application provides a vehicle, energy conversion device and control method thereof, energy conversion device includes machine controller, bus capacitor, first switch module, including a motor, an end cap, a controller, and a cover plate, the second switch module, energy storage capacitor and control module, through controlling switching on of first switch module and second switch module, can make machine controller, bus capacitor, first switch module, including a motor, an end cap, a controller, and a cover plate, the second switch module, energy storage capacitor forms charge-discharge circuit, battery package and bus capacitor discharge and the energy storage capacitor charges bus capacitor and battery package and then realize the intensification of battery package through the discharge of battery package and bus capacitor to energy storage capacitor and the charging of energy storage capacitor to bus capacitor and battery package when machine controller control charge-discharge circuit work, the heating efficiency of battery package.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a current flow diagram of a motor control circuit provided by the prior art;
FIG. 2 is another current flow diagram of a motor control circuit provided by the prior art;
fig. 3 is a circuit diagram of an energy conversion device according to an embodiment of the present application;
fig. 4 is a flowchart of a control method of an energy conversion apparatus according to a second embodiment of the present application;
fig. 5 is another flowchart of a control method of an energy conversion apparatus according to a second embodiment of the present application;
fig. 6 is a circuit diagram of an energy conversion device according to a second embodiment of the present application;
fig. 7 is a current flow diagram of an energy conversion device according to a second embodiment of the present application;
fig. 8 is another current flow diagram of an energy conversion device according to the second embodiment of the present application;
fig. 9 is another current flow diagram of an energy conversion device according to the second embodiment of the present application;
fig. 10 is another current flow diagram of an energy conversion device according to the second embodiment of the present application;
fig. 11 is another current flow diagram of an energy conversion device according to the second embodiment of the present application;
fig. 12 is a current waveform diagram of a charge-discharge loop of an energy conversion device according to a second embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
In an embodiment of the present application, there is provided an energy conversion apparatus, as shown in fig. 3, the energy conversion apparatus includes:
the motor controller 101 is characterized in that first ends of all paths of bridge arms of the motor controller 101 are connected together to form a first junction end, and second ends of all paths of bridge arms of the motor controller 101 are connected together to form a second junction end;
a first end of the bus capacitor C1 is connected with the first bus end, and a second end of the bus capacitor C1 is connected with the second bus end and the negative electrode of the battery pack 103;
a first switch module 104, the first switch module 104 being connected between the positive electrodes of the battery packs 103 and the first bus bar terminal;
a coil of the motor 102 is connected with a middle point of a bridge arm of the motor controller 101 respectively;
a second switch module 105, wherein a first end of the second switch module 105 is connected with a neutral point of a coil of the motor 102;
the energy storage capacitor C2 and the energy storage capacitor C2 are connected between the second end of the second switch module and the second bus end;
and the control module is used for controlling the first switch module 104 and the second switch module 105 to be conducted so that the battery pack 103, the first switch module 104, the bus capacitor C1, the motor controller 101, the motor 102, the second switch module 105 and the energy storage capacitor C2 form a charging and discharging loop, and controlling the motor controller 101 to adjust the current value flowing through the charging and discharging loop so as to adjust the heat generated by the internal resistance of the battery pack 103.
The motor controller 101 comprises M bridge arms, a first end of each bridge arm in the M bridge arms is connected in common to form a first junction end of the motor controller 101, a second end of each bridge arm in the M bridge arms is connected in common to form a second junction end of the motor controller 101, each bridge arm comprises two power switch units which are connected in series, the power switch units can be in the types of transistors, IGBTs, MOS tubes and the like, a middle point of each bridge arm is formed between the two power switch units, the motor comprises M-phase coils, a first end of each phase coil in the M-phase coils is connected with the middle point of each bridge arm in one group of the M bridge arms in a one-to-one correspondence mode, a second end of each phase coil in the M-phase coils is connected in common to form a neutral line, and the neutral line is connected with the second switch module 104.
When M is equal to 3, the motor controller 101 is a three-phase inverter, the three-phase inverter includes three bridge arms, a first end of each of the three bridge arms is connected together to form a first junction end of the motor controller 101, and a second end of each of the three bridge arms is connected together to form a second junction end of the motor controller 101; the three-phase inverter comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, wherein the first power switch unit and the fourth power switch unit are connected in series to form a first bridge arm, the second power switch unit and the fifth switch unit are connected in series to form a second bridge arm, the third power switch unit and the sixth switch unit are connected in series to form a third bridge arm, one ends of the first power switch unit, the third power switch unit and the fifth power switch unit are connected in common to form a first junction end of the three-phase inverter, and one ends of the second power switch unit, the fourth power switch unit and the sixth power switch unit are connected in common to form a second junction end of the three-phase inverter.
The motor 102 includes three-phase coils, a first end of each phase coil in the three-phase coils is connected to a midpoint of each phase arm in the three-phase arms in a one-to-one correspondence manner, and a second end of each phase coil in the three-phase coils is connected in common. A first phase coil of the motor is connected with the middle point of the first bridge arm, a second phase coil of the motor 102 is connected with the middle point of the second bridge arm, and a third phase coil of the motor 102 is connected with the middle point of the third bridge arm.
The first power switch unit in the motor controller 101 includes a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit includes a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit includes a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit includes a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit includes a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit includes a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the motor is a three-phase four-wire system, and can be a permanent magnet synchronous motor or an asynchronous motor, and three-phase coils are connected together to form a neutral point.
The control module (not shown) may include a vehicle controller, a control circuit of the motor controller, and a BMS battery manager circuit, and the three are connected by a CAN line, the control module is connected to the first switch module 104, the second switch module 105, and the motor controller 101, and the control module controls the power switch in the motor controller 101 to be turned on and off according to the acquired information to achieve the turning on of different current loops.
The first switch module 104 is configured to implement conduction or disconnection between the battery pack 103 and the bus capacitor C1 according to the control signal, so that the battery pack 103 charges or stops charging the bus capacitor C1; the second switch module 104 is configured to enable the motor 102 and the energy storage capacitor C2 to be turned on or off according to the control signal, so that energy is exchanged between the motor 102 and the energy storage capacitor C2.
When the first switch module 104 is turned on and off and the second switch module 105 is turned on, the battery pack 103, the first switch module 104, the bus capacitor C1, the motor controller 101, the motor 102, the second switch module 105 and the energy storage capacitor C2 form a charge and discharge loop, the charge and discharge loop comprises a discharge loop and a charge loop, the discharge loop is that the battery pack 103 and the bus capacitor C1 discharge the energy storage capacitor C2 through the motor 102 and the motor controller 101, at the moment, current flows out from the battery pack 103, and the current flows into the energy storage capacitor C2 through the motor 102 and the motor controller 101 to charge the energy storage capacitor C2; the charging loop is that the battery pack 103 and the bus capacitor C1 are charged by the energy storage capacitor C2 through the motor 102 and the motor controller 101, at this time, current flows out of the energy storage capacitor C2, the current flows into the battery pack 103 through the motor controller 101 and the motor 102, and the current flows into the battery pack 103. due to the internal resistance of the battery pack 103, when the discharging loop and the charging loop work, the internal resistance of the battery pack 103 generates heat due to the current flowing into and out of the battery pack 103, and the temperature of the battery pack 103 is further increased.
The embodiment of the application provides an energy conversion device, the energy conversion device includes motor controller 101, bus capacitor C1, first switch module 104, motor 102, second switch module 105, energy storage capacitor C2 and control module, through controlling the switch-on of first switch module 104 and second switch module 104, can make motor controller 101, bus capacitor C1, first switch module 104, motor 102, second switch module 105, energy storage capacitor C2 form the charge-discharge circuit, through the discharge of motor controller 101 control charge-discharge circuit during operation battery package 103 and bus capacitor C1 to energy storage capacitor C2 and the charge of energy storage capacitor C2 to bus capacitor C1 and battery package 103 and then realize the intensification of battery package 103, the heating efficiency of battery package 103 has been promoted.
As an embodiment, when the charge and discharge circuit works, the battery pack 103, the first switch module 104, the bus capacitor C1, the motor controller 101, the motor 102, the second switch module 104, and the energy storage capacitor C2 form a discharge energy storage circuit; the battery pack 103, the first switch module 104, the bus capacitor C1, the motor 102, the second switch module 104, the energy storage capacitor C2 and the motor controller 101 form a discharging and energy releasing circuit; the energy storage capacitor C2, the second switch module 104, the motor 102, the motor controller 101, the bus capacitor C1, the first switch module 104 and the battery pack 103 form a charging energy storage loop, and the motor 102, the motor controller 101, the energy storage capacitor C2, the second switch module 104, the bus capacitor C1, the first switch module 104 and the battery pack 103 form a charging energy storage loop.
The discharging loop comprises a discharging energy storage loop and a discharging energy release circuit, and the charging loop comprises a charging energy release circuit and a charging energy storage loop. When the discharging energy storage loop works under the control of the motor controller 101, the battery pack 103 and the bus capacitor C1 output electric energy to enable a coil of the motor 102 to store energy and charge the energy storage capacitor C2; when the discharging and energy releasing circuit is controlled by the motor controller 101, the battery pack 103 discharges to charge the bus capacitor C1, and meanwhile, the coil of the motor 102 releases energy to charge the energy storage capacitor C2; when the charging energy storage loop works under the control of the motor controller 101, the energy storage capacitor C2 charges the battery pack 103 and the bus capacitor C1, and the coil of the motor 102 stores energy; when the charging and discharging circuit is operated by the motor controller 101, the coil of the motor 102 discharges energy to charge the energy storage capacitor C2, and the bus capacitor C1 charges the battery pack 103. The discharging process of the battery pack 103 to the bus capacitor C1 and the charging process of the bus capacitor C1 to the battery pack 103 are alternately carried out by controlling the motor controller 101, so that the temperature of the battery pack 103 is increased; in addition, the current value flowing through the charge and discharge circuit is adjusted by controlling the duty ratio of the PWM control signal of the motor controller 101, the control duty ratio is equivalent to controlling the on-time of the upper arm and the lower arm, and the current in the charge and discharge circuit is increased or decreased by controlling the on-time of the upper arm or the lower arm to be longer or shorter, so that the heating power generated by the battery pack 103 can be adjusted.
Further, in the process of controlling the operation of the discharging circuit and the charging circuit, the discharging energy storage circuit, the discharging energy release circuit, the charging energy storage circuit and the charging energy release circuit in the discharging circuit may be controlled to operate sequentially according to a preset sequence, for example, the discharging circuit is controlled to be turned on first and then the charging circuit is controlled to be turned on, or the charging circuit is controlled to be turned on first and then the discharging circuit is controlled to be turned on first, the PWM control signal of the motor controller is controlled to turn on different circuits in the charging and discharging circuit, the duty ratio of the PWM control signal of the motor controller is controlled to adjust the current value flowing through the charging and discharging circuit, the discharging energy storage circuit and the discharging energy release circuit in the discharging circuit may be controlled to be turned on alternately for discharging, the charging energy storage circuit and the charging energy release circuit in the charging circuit are controlled to be turned on alternately for discharging, and the duty ratio of the PWM control signal of the motor controller 101 is controlled to adjust the duty ratio of the discharging circuit The current value.
The technical effect of the present embodiment is that the motor controller 101 is controlled to operate the charging and discharging circuit, the battery pack 103 and the bus capacitor C1 are caused to discharge the energy storage capacitor C2 in the discharging circuit, and the energy storage capacitor is caused to charge the bus capacitor C1 and the battery pack 103 in the charging circuit, so as to raise the temperature of the battery pack 103, and the motor controller 101 is controlled to adjust the current in the charging and discharging circuit of the battery pack 103, so as to adjust the heating power generated by the battery pack 103.
An embodiment of the present application provides a control method of an energy conversion apparatus, as shown in fig. 4, the control method includes:
and S10, controlling the first switch module and the second switch module to be conducted to enable the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the energy storage capacitor to form a charge-discharge loop, and controlling the motor controller to adjust a current value flowing through the charge-discharge loop so as to adjust heat generated by internal resistance of the battery pack.
Wherein, the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the charge-discharge loop formed by the energy storage capacitor comprise a discharge loop and a charge loop, the discharge loop refers to the energy storage capacitor discharged by the battery pack and the bus capacitor through the motor controller and the motor, at this time, current flows out from the battery pack, the charge loop refers to the energy storage capacitor charging the battery pack and the bus capacitor through the motor and the motor controller, at this time, current flows in the battery pack, because of the internal resistance in the battery pack, the internal resistance of the battery pack generates heat when the battery pack generates heat due to the current flowing in and out in the working process of the discharge loop and the charge loop, and further the temperature of the battery pack is increased, in order to further control the heat generated by the internal resistance of the battery pack, the motor controller can be controlled by the motor controller, because the motor controller is connected in series in the charge-discharge, different control signals can be input to the motor controller to adjust the current value flowing through the charge-discharge loop, so that the heat generated by the internal resistance of the battery pack is adjusted.
The embodiment of the application provides a control method of an energy conversion device, which is characterized in that when a charge-discharge loop works, a motor controller controls discharge of a battery pack and a bus capacitor to an energy storage capacitor and charge of the energy storage capacitor to the bus capacitor and the battery pack so as to realize temperature rise of the battery pack, and heating efficiency of the battery pack is improved.
As an embodiment, when the control method is in the low frequency control mode, as shown in fig. 5, the method for controlling the motor controller to adjust the current value flowing through the charge-discharge loop further includes:
and S201, acquiring a charge-discharge period of the battery pack and a target equivalent current value of a charge-discharge loop.
The battery management system calculates the internal resistance of the battery pack, and can perform discharging/charging through specific current in one charging and discharging period to calculate the current internal resistance r of the battery pack as delta U/delta I; wherein, the delta U is the voltage difference of the battery at the initial stage and the final stage of discharging/charging, and the delta I is the discharging/charging current; obtaining the internal resistance of the battery pack and then obtaining an equivalent current value according to the heating power of the battery pack, wherein the equivalent current value can be obtained according to a formula P (I)2And r, calculating a target equivalent current value, wherein P is heating power, r is internal resistance of the battery pack, I is the target equivalent current value, and the target equivalent current value can be one value or a group of values.
And S202, acquiring a charge-discharge period of the charge-discharge loop according to the charge-discharge period of the battery pack, and acquiring the duty ratio of the PWM control signal according to a target equivalent current value of the charge-discharge loop.
The charging and discharging cycle of the charging and discharging circuit refers to a cycle of controlling an upper bridge arm and a lower bridge arm to complete one-time switching, the duty ratio refers to a percentage of time of outputting a high-level signal to the upper bridge arm or the lower bridge arm in the motor controller to the whole charging and discharging cycle, the control duty ratio is equivalent to control on-time of the upper bridge arm and the lower bridge arm, and when the charging and discharging circuit works, the on-time of the upper bridge arm or the lower bridge arm is controlled to be lengthened or shortened, the current in the charging and discharging circuit can be increased or reduced.
Wherein, obtain the charge-discharge cycle of charge-discharge circuit according to the charge-discharge cycle of battery package, include:
and setting the charge-discharge period of the battery pack as the charge-discharge period of the charge-discharge loop.
The method for acquiring the duty ratio of the PWM control signal according to the target equivalent current value of the charge-discharge loop comprises the following steps:
and acquiring the duty ratio of the PWM control signal according to the pre-stored corresponding relation between the target equivalent current value and the duty ratio of the PWM control signal.
The charging and discharging cycle of the battery pack and the charging and discharging cycle of the charging and discharging loop are in corresponding relation, and the charging and discharging cycle of the charging and discharging loop is equal to the charging and discharging cycle of the battery pack in the low-frequency control mode. The method comprises the steps of storing a corresponding relation table of target equivalent current values and duty ratios of PWM control signals in advance, wherein the corresponding relation table can be obtained through multiple test measurement, the number of the target equivalent current values in one charging and discharging period is one in a low-frequency control mode, and the duty ratios of the PWM control signals in the charging and discharging periods of a charging and discharging loop can be obtained according to the corresponding relation table.
Further, controlling the motor controller to adjust a value of current flowing through the charge-discharge circuit to adjust heat generated by the internal resistance of the battery pack includes:
and controlling the switches of upper and lower bridge arms of the motor controller according to the charge-discharge period of the charge-discharge loop and the duty ratio of the PWM control signal, and adjusting the current value flowing through the charge-discharge loop so as to adjust the heat generated by the internal resistance of the battery pack.
The charging and discharging cycle of the charging and discharging loop comprises a charging cycle and a discharging cycle, the charging cycle refers to the working cycle of the charging loop in the charging and discharging loop, the discharging cycle refers to the working cycle of the discharging loop in the charging and discharging loop, and one charging and discharging cycle of the battery pack is divided into a charging duration and a discharging duration. In the low-frequency control mode, the charging duration is equal to the charging period, and the discharging duration is equal to the discharging period, that is, the charging duration includes a charging period of the charging and discharging circuit, and the discharging duration includes a discharging period of the charging and discharging circuit, and the charging period may be equal to or unequal to the discharging period. And controlling the switches of upper and lower bridge arms of the motor controller according to the charging period, the discharging period and the duty ratio of the PWM control signal, controlling the discharging energy storage circuit, the discharging energy release circuit, the charging energy storage circuit and the charging energy release circuit in the charging and discharging circuit to work in sequence, and adjusting the current value flowing through the charging and discharging circuit to be a target current equivalent value so as to adjust the heat generated by the internal resistance of the battery pack.
The method adopts a low-frequency control mode to obtain the charge-discharge period of the battery pack and the target equivalent current value of the charge-discharge loop, obtain the charge-discharge period of the charge-discharge loop according to the charge-discharge period of the battery pack, obtain the duty ratio of a PWM control signal according to the target equivalent current value of the charge-discharge loop, control the switches of upper and lower bridge arms of the motor controller according to the duty ratio of the PWM control signal, and adjust the current value flowing through the charge-discharge loop to be the target equivalent current value.
The present embodiment will be described in detail below with reference to specific circuit configurations:
as shown in fig. 6, the energy conversion apparatus includes a motor controller 101, a motor 102, a first switch module 104, a second switch module 105, a bus capacitor C1, an energy storage capacitor C2, and a switch K4, where the first switch module 104 includes a switch K2, a switch K3, and a resistor R, the second switch module 105 includes a switch K1, a positive electrode of the battery pack 103 is connected to a first end of the resistor R and a first end of the switch K2, a second end of the resistor R is connected to a first end of the switch K3, a second end of the switch K3 is connected to a second end of the switch K2, a first end of the capacitor C1, and a first junction end of the motor controller 101, midpoints of three legs of the motor controller 101 are respectively connected to three coils of the motor 102, a connection point of the three coils of the motor 102 is connected to a first end of the switch K1, a second end of the switch K1 is connected to a first end of the energy storage capacitor C2, and a second end of the energy storage capacitor C2 is connected to, A second terminal of bus capacitor C1 and a second terminal of switch K4.
Wherein the motor controller 101 comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit, the first power switch unit and the fourth power switch unit form a first bridge arm, the third power switch unit and the sixth power switch unit form a second bridge arm, the fifth power switch unit and the second power switch unit form a third bridge arm, one end of the first power switch unit, one end of the third power switch unit and one end of the fifth power switch unit are connected in common and form a first current sink end of the motor controller, one end of the second power switch unit, one end of the fourth power switch unit and one end of the sixth power switch unit are connected in common and form a second current sink end of the motor controller, a first phase coil of the motor 102 is connected with a midpoint of the first bridge arm, a second phase coil of the motor 102 is connected with a midpoint of the second bridge arm, the third phase coil of motor 102 is connected to the midpoint of the third leg.
The first power switch unit in the motor controller 101 includes a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit includes a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit includes a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit includes a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit includes a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit includes a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the three-phase ac motor is a three-phase four-wire system, and can be a permanent magnet synchronous motor or an asynchronous motor, and a neutral line is led out from a connection of three-phase coils.
As shown in fig. 7, when the energy conversion device is heated, the bus capacitor is pre-charged, and the pre-charging is specifically controlled as follows: firstly, the switch K1 is opened, preferably, pre-charging is ready, then the switches K3 and K4 are closed to start pre-charging the bus capacitor C1, the voltage on the bus capacitor C1 is increased to a certain value by the battery pack 103, the value is close to the voltage of the battery pack 103, then the switch K2 is closed, the switch K3 is opened to finish the pre-charging process, if the voltage of the bus capacitor C1 fails to reach the certain value, the pre-charging is failed, and the whole program is finished.
Then, when the motor controller 101 is controlled to enter a low-frequency control mode, a formal heating process is performed to obtain a charge-discharge period of the battery pack 103 and a target equivalent current value of a charge-discharge loop, obtain a charge duration and a discharge duration according to the charge-discharge period of the battery pack 103, obtain the charge period of the charge-discharge loop according to the charge duration, obtain the discharge period of the charge-discharge loop according to the discharge duration, obtain a duty ratio of a PWM control signal according to the target equivalent current value of the charge-discharge loop, control the switching of upper and lower bridge arms of the motor controller according to the duty ratio of the PWM control signal, and further control the charge-discharge current of the battery pack, so that the heating power inside the battery reaches an expected value, which:
the first stage is the work of a discharge energy storage loop: as shown in fig. 8, when the upper arm of the motor controller 101 is turned on, a current flowing from the positive electrode of the battery pack 103 passes through the switch K2 and then is combined with a current flowing from the bus capacitor C1 into a single path, and then flows back to the negative electrode of the battery pack 103 and the bus capacitor C1 through the upper arm (the first upper arm VT1, the third upper arm VT3, and the fifth upper arm VT5), the motor 102, the switch K1, and the energy storage capacitor C2 of the motor controller 101, and the current is increased continuously, in this process, the battery pack 103 and the bus capacitor C1 are discharged to the outside, so that the voltage of the energy storage capacitor C2 is increased continuously.
The second stage is the work of the discharging and energy releasing circuit: as shown in fig. 9, the upper arm of the motor controller 101 is disconnected, the lower arm is closed, current flows out from a connection point of the three-phase coil of the motor 102, flows to the anode of the energy storage capacitor C2 through the switch K1, and then flows back to the three-phase coil of the motor 102 through the lower arm of the motor controller 101 (the second lower bridge diode VD2, the fourth lower bridge diode VD4, and the sixth lower bridge diode VD6), the current is continuously reduced, the voltage of the energy storage capacitor C2 is continuously increased, and when the current is reduced to zero, the voltage of the capacitor C2 reaches the maximum value. Meanwhile, as the output current of the battery pack 103 is reduced, the voltage at two ends of the battery pack 102 is increased, the bus capacitor C1 is continuously charged, and the current is gradually reduced along with the voltage increase of the capacitor bus C1.
The third stage is the work of the charging energy storage loop: as shown in fig. 10, the lower arm of the motor controller 101 is disconnected, the current flows out from the positive electrode of the energy storage capacitor C2, flows into the motor 102 through the switch K1, flows into the three-phase coil of the motor 102, flows into the positive electrodes of the bus capacitor C1 and the battery pack 103 through the upper arm of the motor controller 101 (the first upper bridge diode VD1, the third upper bridge diode VD3, and the fifth upper bridge diode VD5), and finally flows back to the negative electrode of the energy storage capacitor C2.
The fourth stage is that the charging and energy-releasing circuit works: as shown in fig. 11, the lower arm of the motor controller 101 is controlled to be turned on, and the current flows out from the three-phase coil of the motor 102, passes through the lower arm of the motor controller 101 (the second lower arm VT2, the fourth lower arm VT4, and the sixth lower arm VT6), flows through the negative electrode of the energy storage capacitor C2, and finally flows through the switch K1 to the neutral point of the motor 102, so that the voltage of the energy storage capacitor C2 continuously decreases, and the current also continuously decreases. Meanwhile, as the charging current of the battery pack 103 is reduced, the voltage across the battery pack 103 is reduced, the bus capacitor C1 begins to charge the battery pack 103, and the current is gradually reduced to zero as the voltage of the bus capacitor C1 is reduced.
The four processes are continuously circulated, so that the battery pack is continuously and rapidly charged and discharged, and a large amount of heat is generated due to the existence of the internal resistance of the battery pack, so that the temperature of the battery pack is rapidly increased.
As another embodiment, the control method further includes a high frequency control mode for controlling the motor controller to adjust a value of current flowing through the charge/discharge circuit, and the method further includes:
s301, acquiring a charge and discharge period of the battery pack and a target current waveform of a charge and discharge loop in the charge and discharge period of the battery pack, wherein the charge and discharge period of the battery pack comprises a charge duration and a discharge duration, the charge duration comprises a plurality of charge periods of the charge and discharge loop, and the discharge duration comprises a plurality of discharge periods of the charge and discharge loop.
In this step, a charge-discharge period of the battery pack and a target current waveform of the charge-discharge loop are given by the battery management system, a preset charge-discharge period of the battery pack exists in the battery management system, the target current waveform refers to a current waveform obtained by adjusting a current value flowing through the charge-discharge loop through a control motor controller controlling the charge-discharge loop, and the target current waveform can satisfy a waveform function, for example, the target current waveform can be a triangular wave, a sine wave and other waveforms, one charge-discharge period of the battery pack is divided into a charge duration and a discharge duration, the charge duration refers to a time consumed by a charge process of the battery pack in one charge-discharge period, and the discharge duration refers to a time consumed by a discharge process of the battery pack in one charge-discharge period. In the high-frequency control mode, the charge and discharge cycle of the charge and discharge loop comprises a charge cycle and a discharge cycle, and one charge and discharge cycle of the battery pack comprises a plurality of charge cycles and discharge cycles, wherein the corresponding relationship is that the charge duration corresponds to a plurality of charge cycles, and the discharge duration corresponds to a plurality of discharge cycles.
S302, obtaining a plurality of target equivalent current values corresponding to the target current waveform according to the target current waveform.
In this step, in order to obtain the target current waveform, a plurality of target equivalent current values corresponding to the target current waveform are selected, for example, the target current waveform satisfies a sine function I ═ Asin ω t, and the time and current values corresponding to the function are selected.
Step S303, obtaining the duty ratio of the PWM control signal according to the target equivalent current value, and obtaining the number of charging cycles included in the charging duration and the number of discharging cycles included in the discharging duration according to the charging and discharging cycles of the battery pack and the number of the target equivalent current values, wherein one target equivalent current value corresponds to one charging cycle or one discharging cycle.
In this step, obtaining the duty ratio of the PWM control signal according to the target equivalent current value of the charge and discharge circuit includes:
and acquiring the duty ratio of the PWM control signal according to the pre-stored corresponding relation between the target equivalent current value and the duty ratio of the PWM control signal.
The target equivalent current value and the duty ratio corresponding relation table of the PWM control signal are stored in advance, and the corresponding relation table can be obtained through multiple times of test measurement.
In this step, obtaining the number of charging cycles included in the charging duration and the number of discharging cycles included in the discharging duration according to the charging and discharging cycles of the battery pack and the number of the target equivalent current values includes:
the charge and discharge period, the number of target equivalent current values, the charge duration, the discharge duration, the charge period, the discharge period, the number of charge periods and the number of discharge periods of the battery pack satisfy the following formulas:
T＝T1+T2；
T1＝N1×t1；
T2＝N2×t2；
N＝N1+N2；
wherein, T is a charge-discharge period of the battery pack, T1 is a charge duration, T2 is a discharge duration, T1 is a charge period of the charge-discharge circuit, N1 is the number of charge periods, T2 is a discharge period of the charge-discharge circuit, N2 is the number of discharge periods, and N is the number of target equivalent current values.
The method comprises the steps of obtaining N1 target equivalent current values corresponding to N1 charging cycles in a charging duration, obtaining N1 charging cycles corresponding to the duty ratios of N1 PWM control signals, obtaining N2 target equivalent current values corresponding to N2 charging cycles in a discharging duration, and obtaining N2 charging cycles corresponding to the duty ratios of N2 PWM control signals.
Further, controlling the motor controller to adjust a value of current flowing through the charge-discharge circuit to adjust heat generated by the internal resistance of the battery pack includes:
and controlling switches of upper and lower bridge arms of the motor controller according to the charging period and the number of the charging periods, the discharging period and the number of the discharging periods of the charging and discharging loops and the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loops so as to adjust the heat generated by the internal resistance of the battery pack.
Controlling switches of upper and lower bridge arms of a motor controller according to the number of charging cycles, the number of discharging cycles and the duty ratio of PWM control signals, and adjusting the current value flowing through a charging and discharging loop, comprising:
acquiring a target equivalent current value corresponding to each charging period and each discharging period and the duty ratio of a PWM control signal;
and controlling the switches of upper and lower bridge arms of the motor controller in each charging period and each discharging period according to the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loop to be a target equivalent current value.
The current value in the charge-discharge loop is made to be a target equivalent current value by adjusting the duty ratio of the PWM control signal of each charge cycle and each discharge cycle, and a target current waveform is finally formed.
In this embodiment, the battery pack includes N control periods of the motor controller within the entire charge-discharge period, where the control period is a charge period or a discharge period, and adjusting the duty ratio of the power tube each time changes the change direction of the current at the same time, and increasing the duty ratio of the lower bridge arm increases the discharge current of the battery or decreases the charge current; and the duty ratio of the lower bridge arm is reduced, so that the discharging current of the battery pack is reduced, or the charging current is increased, and the integral charging and discharging current can be increased or reduced by controlling the average duty ratio of N times of switch control in each battery charging and discharging period. Each time of switching control, the local current magnitude can be changed, for example, the current value at a certain point can be increased or decreased, so that the charge and discharge current of the battery can present waveforms like triangular waves, sine waves, square waves and the like through the cooperative control of the duty ratios of the switching tubes for N times. According to actual control requirements, battery pack heating power requirements, battery service life and other factors, a proper current waveform is selected, so that control is convenient to achieve, battery stability is not affected, and battery heating power is large.
Further, controlling the switches of the upper and lower bridge arms of the motor controller in each charging period and each discharging period according to the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loop to be a target equivalent current value, and then:
and acquiring an actual current value in the charge-discharge loop, acquiring a duty ratio correction value of the current charge cycle or the current discharge cycle according to the relation between the actual current value and the target equivalent current value, and correcting the duty ratio of the next charge cycle or the next discharge cycle according to the duty ratio correction value.
When the actual current value does not accord with the target current value, the current difference value between the actual current value and the target equivalent current value is obtained, the duty ratio correction value corresponding to the current difference value is obtained according to the corresponding relation between the current value and the duty ratio of the PWM control signal, the duty ratio correction value is superposed with the duty ratio corresponding to the next control period, and then the motor controller is controlled.
According to the embodiment, the duty ratio correction value of the current charging period or the current discharging period is obtained through the relation between the actual current value and the target equivalent current value, and the duty ratio of the next control period is adjusted according to the duty ratio correction value, so that the actual current value of the charging and discharging loop accords with the target equivalent current value, and the current waveform is more accurate.
In the embodiment, a high-frequency control mode is set, so that one target current value corresponds to a discharge cycle or a charge cycle of a click controller, and the effective value of the current flowing through the battery pack can reach any one target current value by continuously adjusting the duty ratio of each control cycle, so that the current waveform can be adjusted, and the adaptability is stronger.
The following describes the operation of the high-frequency control mode by a specific circuit structure:
when the three-phase inverter is controlled to be in a high-frequency control mode, a heating instruction is received, the heating state is entered, namely, the pre-charging of the bus capacitor C1 is completed, the switch K1 and the switch K3 are closed, the voltage on the bus capacitor C1 is close to the voltage of the battery pack 103, the power tubes of the motor controller 101 are all in a closed state, almost no current exists in the motor inductor, and the system is in a ready state.
Then controlling the motor controller 101 to enter a high-frequency control mode, entering a formal heating process, starting to completely disconnect six power tubes of the motor controller 101, determining a charge-discharge period of the battery pack 103, mainly given by a battery management system, then obtaining a current waveform I (akt + b) to be achieved, wherein T is time, I is a target equivalent current value, a and b are constants, and k is a coefficient, as shown in fig. 12, setting the charge-discharge period of the battery pack to be T, the discharge duration to be T0, the charge duration to be T-T0, selecting 7 target equivalent current values within the discharge duration T0, selecting a time interval between two equivalent current values to be delta T, obtaining a current variable according to I (T + delta T) -I (T), obtaining a duty ratio of a PWM control signal according to the current variable, and obtaining the discharge duration corresponding to 7 discharge periods, each discharge cycle corresponds to the duty ratio of a PWM control signal, 4 target equivalent current values are selected in the charging duration, each charging cycle corresponds to the duty ratio of a PWM control signal, and the motor controller is adjusted according to the duty ratio of the PWM control signal to enable the current value of a charge-discharge loop to be a target equivalent current value, so that the heating power in the battery reaches an expected value, and the method specifically comprises the following steps:
the first stage is the work of a discharge energy storage loop: as shown in fig. 8, when the upper arm of the motor controller 101 is turned on, a current flowing from the positive electrode of the battery pack 103 passes through the switch K2 and then is combined with a current flowing from the bus capacitor C1 into a single path, and then flows back to the negative electrode of the battery pack 103 and the bus capacitor C1 through the upper arm (the first upper arm VT1, the third upper arm VT3, and the fifth upper arm VT5), the motor 102, the switch K1, and the energy storage capacitor C2 of the motor controller 101, and the current is increased continuously, in this process, the battery pack 103 and the bus capacitor C1 are discharged to the outside, so that the voltage of the energy storage capacitor C2 is increased continuously.
The second stage is the work of the discharging and energy releasing circuit: as shown in fig. 9, the upper arm of the motor controller 101 is disconnected, the lower arm is closed, current flows out from a connection point of the three-phase coil of the motor 102, flows to the anode of the energy storage capacitor C2 through the switch K1, and then flows back to the three-phase coil of the motor 102 through the lower arm of the motor controller 101 (the second lower bridge diode VD2, the fourth lower bridge diode VD4, and the sixth lower bridge diode VD6), the current is continuously reduced, the voltage of the energy storage capacitor C2 is continuously increased, and when the current is reduced to zero, the voltage of the capacitor C2 reaches the maximum value. Meanwhile, as the output current of the battery pack 103 is reduced, the voltage at two ends of the battery pack 102 is increased, the bus capacitor C1 is continuously charged, and the current is gradually reduced along with the voltage increase of the capacitor bus C1.
And controlling the discharge energy storage circuit and the discharge energy release circuit to work for 7 times according to 7 duty ratios corresponding to 7 discharge periods, wherein the increase of the duty ratio of the lower bridge arm every time can increase the discharge current of the battery, so that the current value of the discharge circuit reaches the target current waveform.
The third stage is the work of the charging energy storage loop: as shown in fig. 10, the lower arm of the motor controller 101 is disconnected, the current flows out from the positive electrode of the energy storage capacitor C2, flows into the motor 102 through the switch K1, flows into the three-phase coil of the motor 102, flows into the positive electrodes of the bus capacitor C1 and the battery pack 103 through the upper arm of the motor controller 101 (the first upper bridge diode VD1, the third upper bridge diode VD3, and the fifth upper bridge diode VD5), and finally flows back to the negative electrode of the energy storage capacitor C2.
The fourth stage is that the charging and energy-releasing circuit works: as shown in fig. 11, the lower arm of the motor controller 101 is controlled to be turned on, and the current flows out from the three-phase coil of the motor 102, passes through the lower arm of the motor controller 101 (the second lower arm VT2, the fourth lower arm VT4, and the sixth lower arm VT6), flows through the negative electrode of the energy storage capacitor C2, and finally flows through the switch K1 to the neutral point of the motor 102, so that the voltage of the energy storage capacitor C2 continuously decreases, and the current also continuously decreases. Meanwhile, as the charging current of the battery pack 103 is reduced, the voltage across the battery pack 103 is reduced, the bus capacitor C1 begins to charge the battery pack 103, and the current is gradually reduced to zero as the voltage of the bus capacitor C1 is reduced.
And controlling the charging energy storage circuit and the charging energy release circuit to work for 4 times according to 4 duty ratios corresponding to 4 charging cycles, so that the current value of the charging circuit reaches a target current waveform.
The third embodiment of the invention also provides a vehicle which comprises the energy conversion device provided by the first embodiment.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (14)
1. An energy conversion device, characterized in that the energy conversion device comprises:
the first ends of all paths of bridge arms of the motor controller are connected together to form a first junction end, and the second ends of all paths of bridge arms of the motor controller are connected together to form a second junction end;
a first end of the bus capacitor is connected with the first bus end, and a second end of the bus capacitor is respectively connected with the second bus end and the cathode of the battery pack;
a first switch module connected between a positive electrode of the battery pack and the first bus bar terminal;
the coils of the motor are respectively connected with the middle points of the bridge arms of the motor controller;
a second switch module, a first end of the second switch module being connected to a neutral point of a coil of the motor;
an energy storage capacitor connected between the second end of the second switch module and the second bus bar end;
the control module is used for controlling the first switch module and the second switch module to be conducted so that the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the energy storage capacitor form a charging and discharging loop, and controlling the motor controller to adjust a current value flowing through the charging and discharging loop so as to adjust heat generated by internal resistance of the battery pack.
2. The energy conversion device according to claim 1, wherein the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module, and the energy storage capacitor form a discharge energy storage circuit when the charge and discharge circuit is operated; the battery pack, the first switch module, the bus capacitor, the motor, the second switch module, the energy storage capacitor and the motor controller form a discharging and energy releasing circuit; the energy storage capacitor, the second switch module, the motor controller, the bus capacitor, the first switch module and the battery pack form a charging energy storage loop; the motor, the motor controller, the energy storage capacitor, the second switch module, the bus capacitor, the first switch module and the battery pack form a charging and energy releasing circuit.
3. The energy conversion device according to claim 2, wherein the control module controls the motor controller to sequentially operate the discharge energy storage circuit, the discharge energy release circuit, the charge energy storage circuit, and the charge energy release circuit in a preset sequence to adjust a value of current flowing through the charge and discharge circuit.
4. The energy conversion device according to claim 2, wherein the control module controls the motor controller to alternately conduct the discharge energy storage circuit and the discharge energy release circuit, and then alternately conduct the charge energy storage circuit and the charge energy release circuit to adjust the value of the current flowing through the charge and discharge circuit.
5. A control method of the energy conversion apparatus according to claim 1, characterized in that the control method comprises:
and controlling the first switch module and the second switch module to be conducted so that the battery pack, the first switch module, the bus capacitor, the motor controller, the motor, the second switch module and the energy storage capacitor form a charge-discharge loop, and controlling the motor controller to adjust the current value flowing through the charge-discharge loop so as to adjust the heat generated by the internal resistance of the battery pack.
6. The control method according to claim 5, wherein said controlling said motor controller to adjust a value of current flowing through said charge-discharge circuit further comprises:
acquiring a charge-discharge period of the battery pack and a target equivalent current value of the charge-discharge loop;
acquiring a charge-discharge period of the charge-discharge loop according to the charge-discharge period of the battery pack, and acquiring a duty ratio of a PWM control signal according to a target equivalent current value of the charge-discharge loop;
the controlling the motor controller to adjust a value of current flowing through the charge-discharge loop to adjust heat generated by the internal resistance of the battery pack includes:
and controlling the switching of upper and lower bridge arms of the motor controller according to the switching period of the charge-discharge loop and the duty ratio of the PWM control signal, and adjusting the current value flowing through the charge-discharge loop so as to adjust the heat generated by the internal resistance of the battery pack.
7. The control method according to claim 6, wherein the obtaining of the charge-discharge cycle of the charge-discharge circuit according to the charge-discharge cycle of the battery pack includes:
setting the charge-discharge period of the battery pack as the charge-discharge period of the charge-discharge loop;
the obtaining of the duty ratio of the PWM control signal according to the target equivalent current value of the charge and discharge loop includes:
and acquiring the duty ratio of the PWM control signal according to the pre-stored corresponding relation between the target equivalent current value and the duty ratio of the PWM control signal.
8. The control method according to claim 5, wherein said controlling said motor controller to adjust a value of current flowing through said charge-discharge circuit further comprises:
acquiring a charge-discharge period of the battery pack and a target current waveform of the charge-discharge loop in the charge-discharge period of the battery pack, wherein the charge-discharge period of the battery pack comprises a charge duration and a discharge duration, the charge duration comprises a plurality of charge periods of the charge-discharge loop, and the discharge duration comprises a plurality of discharge periods of the charge-discharge loop;
obtaining a plurality of target equivalent current values corresponding to the target current waveform according to the target current waveform;
and acquiring the duty ratio of a PWM control signal according to the target equivalent current value, and acquiring the number of charging cycles contained in the charging time length and the number of discharging cycles contained in the discharging time length according to the charging and discharging cycles of the battery pack and the number of the target equivalent current values, wherein one target equivalent current value corresponds to one charging cycle or one discharging cycle.
9. The control method according to claim 8, wherein obtaining the number of charge cycles included in the charge period and the number of discharge cycles included in the discharge period from the charge-discharge cycles of the battery pack and the number of target equivalent current values includes:
the charge and discharge period of the battery pack, the number of the target equivalent current values, the charge duration, the discharge duration, the charge period, the discharge period, the number of the charge periods and the number of the discharge periods satisfy the following formulas:
T＝T1+T2；
T1＝N1×t1；
T2＝N2×t2；
N＝N1+N2；
wherein, T is the charge-discharge cycle of the battery pack, T1 is the charge duration, T2 is the discharge duration, T1 is the charge cycle of the charge-discharge circuit, N1 is the number of charge cycles, T2 is the discharge cycle of the charge-discharge circuit, N2 is the number of discharge cycles, and N is the number of target equivalent current values.
10. The control method according to claim 8, wherein the obtaining the duty ratio of the PWM control signal according to the target equivalent current value of the charge-discharge loop comprises:
and acquiring the duty ratio of the PWM control signal according to the pre-stored corresponding relation between the target equivalent current value and the duty ratio of the PWM control signal.
11. The control method according to claim 9, wherein the controlling the motor controller to adjust a value of current flowing through the charge-discharge circuit to adjust the amount of heat generated by the internal resistance of the battery pack includes:
and controlling switches of upper and lower bridge arms of the motor controller according to the charging cycles and the number of the charging cycles, the discharging cycles and the number of the discharging cycles of the charging and discharging loop and the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loop so as to adjust the heat generated by the internal resistance of the battery pack.
12. The control method according to claim 11, wherein the controlling the switches of the upper and lower arms of the motor controller according to the number of charging cycles, the number of discharging cycles, and the duty ratio of the PWM control signal to adjust the current flowing through the charging and discharging circuit comprises:
acquiring a target equivalent current value corresponding to each charging period and each discharging period and the duty ratio of a PWM control signal;
and controlling the switches of upper and lower bridge arms of the motor controller in each charging period and each discharging period according to the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loop to be a target equivalent current value.
13. The control method according to claim 12, further comprising: controlling the switching of an upper bridge arm and a lower bridge arm of the motor controller in each charging period and each discharging period according to the duty ratio of the PWM control signal, and adjusting the current value flowing through the charging and discharging loop to be a target equivalent current value, and then further comprising:
and acquiring an actual current value in the charge and discharge loop, acquiring a duty ratio correction value of the current charge cycle or the current discharge cycle according to the relation between the actual current value and a target equivalent current value, and correcting the duty ratio of the next charge cycle or the next discharge cycle according to the duty ratio correction value.
14. A vehicle, characterized in that the vehicle comprises the energy conversion device according to any one of claims 1 to 4.
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| WO2023010898A1 (en) * | 2021-08-05 | 2023-02-09 | 宁德时代新能源科技股份有限公司 | Charging and discharging circuit, system and control method therefor |
| WO2023061278A1 (en) * | 2021-10-11 | 2023-04-20 | 华为数字能源技术有限公司 | Battery system and power supply system |
| CN117394741A (en) * | 2023-12-12 | 2024-01-12 | 珠海格力电器股份有限公司 | Motor driving circuit, motor driving method, fan and unit |
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| CN115378063B (en) * | 2022-05-23 | 2024-04-09 | 宁德时代新能源科技股份有限公司 | Control method, device, equipment, system and storage medium for charge-discharge circuit |
| CN117394741A (en) * | 2023-12-12 | 2024-01-12 | 珠海格力电器股份有限公司 | Motor driving circuit, motor driving method, fan and unit |
| CN117394741B (en) * | 2023-12-12 | 2024-04-05 | 珠海格力电器股份有限公司 | Motor driving circuit, motor driving method, fan and unit |
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