CN115489387A - Energy conversion device, control method thereof and vehicle - Google Patents

Energy conversion device, control method thereof and vehicle Download PDF

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Publication number
CN115489387A
CN115489387A CN202110672235.5A CN202110672235A CN115489387A CN 115489387 A CN115489387 A CN 115489387A CN 202110672235 A CN202110672235 A CN 202110672235A CN 115489387 A CN115489387 A CN 115489387A
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CN
China
Prior art keywords
power battery
voltage
module
motor
power
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Pending
Application number
CN202110672235.5A
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Chinese (zh)
Inventor
陈明文
薛鹏辉
王亮
王俊龙
郑乐平
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BYD Co Ltd
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BYD Co Ltd
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Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202110672235.5A priority Critical patent/CN115489387A/en
Publication of CN115489387A publication Critical patent/CN115489387A/en
Pending legal-status Critical Current

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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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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

Abstract

The disclosure relates to an energy conversion device applied to a vehicle-mounted power battery, a control method of the energy conversion device and a vehicle. The device comprises: the voltage adjusting module is used for reducing the output voltage of the power battery and then outputting the reduced output voltage from the second end of the voltage adjusting module; the input end of the first voltage conversion module is connected with the second end of the voltage adjustment module, and the first voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the first motor; the input end of the second voltage conversion module is connected with the second end of the power battery or the voltage adjustment module, and the second voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to a second motor; and the controller is configured to control the voltage adjusting module, the first voltage conversion module and the second voltage conversion module to enable the power battery to supply power as required if the power battery is determined to be required to supply power for the first motor and/or the second motor. The scheme realizes the driving of motors with different voltage platforms.

Description

Energy conversion device, control method thereof and vehicle
Technical Field
The disclosure relates to the technical field of energy conversion of vehicle-mounted batteries, in particular to an energy conversion device, a control method of the energy conversion device and a vehicle.
Background
High-voltage battery platforms are currently emerging in more and more vehicles as a more advanced technical configuration. In contrast to a conventional battery low voltage platform (e.g., 350V), for example, an 800V battery voltage platform may be defined as a high voltage platform.
The high-voltage battery platform has higher voltage, the transmitted current corresponding to the same power is smaller, the wire diameter and the weight of a high-power wiring harness are reduced, and the high-voltage battery platform can quickly become a wind vane of a future new energy automobile due to the characteristics of ultra-fast charging and compact wiring harness.
The energy conversion device with the high-voltage battery platform is used as an important component in a motor controller, and the reasonable design and application of the circuit topology and the structure are directly related to the utilization rate of the high-voltage platform.
Disclosure of Invention
The purpose of the present disclosure is to provide a reliable and efficient energy conversion device suitable for a high-voltage battery platform, a control method thereof, and a vehicle.
In order to achieve the above object, the present disclosure provides an energy conversion apparatus applied to a vehicle-mounted power battery, the apparatus including:
the first end of the voltage adjusting module is connected with the power battery, and the voltage adjusting module is used for reducing the output voltage of the power battery and then outputting the reduced output voltage from the second end of the voltage adjusting module;
the input end of the first voltage conversion module is connected with the second end of the voltage regulation module, and the first voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to a first motor;
the input end of the second voltage conversion module is connected with the second end of the power battery or the second end of the voltage regulation module, and the second voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to a second motor;
and the controller is configured to control the voltage adjusting module, the first voltage conversion module and the second voltage conversion module to enable the power battery to supply power as required if the power battery is determined to be required to supply power for the first motor and/or the second motor.
Optionally, the voltage adjustment module includes:
the drain electrode of the first switching tube is connected with the positive electrode of the power battery;
a source electrode of the second switch tube is connected with a negative electrode of the power battery, and a source electrode of the first switch tube is connected with a drain electrode of the second switch tube;
the anode of the first diode is connected with the source electrode of the first switching tube, and the cathode of the first diode is connected with the drain electrode of the first switching tube;
the anode of the second diode is connected with the source electrode of the second switching tube, and the cathode of the second diode is connected with the drain electrode of the second switching tube;
the first end of the inductor is connected with the source electrode of the first switch tube, the second end of the inductor is connected with the first voltage conversion module, the drain electrode of the first switch tube and the source electrode of the second switch tube form the first end of the voltage adjustment module, and the second end of the inductor and the source electrode of the second switch tube form the second end of the voltage adjustment module.
Optionally, the apparatus further comprises:
a first end of the first bus capacitor is connected with the positive electrode of the power battery, and a second end of the first bus capacitor is connected with the negative electrode of the power battery;
and/or the presence of a gas in the atmosphere,
and the first end of the second bus capacitor is connected with the second end of the inductor, and the second end of the second bus capacitor is connected with the source electrode of the second switching tube.
Optionally, the apparatus further comprises:
the direct current charging switch module is connected with the second end of the voltage adjusting module and used for connecting or disconnecting a direct current power supply with the voltage adjusting module;
the controller is further configured to control the direct current charging switch module and the voltage adjusting module to enable the direct current power supply to charge the power battery through the direct current charging switch module and the voltage adjusting module if it is determined that the power battery needs to be charged.
Optionally, the dc charging switch module includes a first relay, a second relay and a charging capacitor, a first end of the charging capacitor is connected to a second end of the inductor through the first relay, a second end of the charging capacitor is connected to a source of the second switch tube through the second relay, and two ends of the charging capacitor are used for connecting the dc power supply;
the controller is further configured to control the first switching tube and the second switching tube to be turned off, the first relay and the second relay to be turned on, and the first voltage conversion module and the second voltage conversion module to be turned off if it is determined that the power battery needs to be charged, so that a direct-current power supply charges the power battery through the direct-current charging switching module and the voltage adjustment module.
Optionally, the apparatus further comprises:
a first end of the second bus capacitor is connected with a second end of the inductor, and a second end of the second bus capacitor is connected with a source electrode of the second switching tube;
the controller is further configured to control the voltage adjustment module to charge and discharge the power battery through the inductor and the second bus capacitor to heat the power battery if it is determined that the power battery needs to be heated.
The present disclosure also provides an energy conversion method applied to a vehicle-mounted power battery, the method including:
if the power battery is needed to supply power for the first motor and/or the second motor, controlling a voltage adjusting module, a first voltage conversion module and a second voltage conversion module to enable the power battery to supply power as required;
the first end of the voltage adjusting module is connected with the power battery, and the voltage adjusting module is used for reducing the output voltage of the power battery and then outputting the reduced output voltage from the second end of the voltage adjusting module; the input end of the first voltage conversion module is connected with the second end of the voltage regulation module, and the first voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the first motor; the input end of the second voltage conversion module is connected with the power battery or the second end of the voltage adjustment module, and the second voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the second motor.
Optionally, the voltage adjusting module includes a first switching tube, a second switching tube, a first diode, a second diode and an inductor, and a drain of the first switching tube is connected to the anode of the power battery; the source electrode of the second switch tube is connected with the negative electrode of the power battery, and the source electrode of the first switch tube is connected with the drain electrode of the second switch tube; the anode of the first diode is connected with the source electrode of the first switch tube, and the cathode of the first diode is connected with the drain electrode of the first switch tube; the anode of the second diode is connected with the source electrode of the second switching tube, and the cathode of the second diode is connected with the drain electrode of the second switching tube; the first end of the inductor is connected with the source electrode of the first switching tube, and the second end of the inductor is connected with the first voltage conversion module; the input end of the second voltage conversion module is connected with the power battery;
if it is determined that the power battery is required to supply power to the first motor and/or the second motor, the method controls the voltage adjustment module, the first voltage conversion module and the second voltage conversion module to enable the power battery to supply power as required, and includes: if the power battery is needed to supply power to the first motor, controlling the first switching tube to be conducted, the second switching tube to be switched off, the first voltage conversion module and the second voltage conversion module to be switched off, and enabling the power battery to store energy for the inductor; and if the current in the inductor reaches a preset value, controlling the first voltage conversion module to be conducted so that the power battery supplies power for the first motor.
Optionally, the input end of the second voltage conversion module is connected with the power battery;
if the power battery is needed to supply power to the first motor and/or the second motor, the voltage adjusting module, the first voltage conversion module and the second voltage conversion module are controlled to enable the power battery to supply power as required, and the method comprises the following steps: and if the power battery is required to supply power to the second motor, controlling the first switching tube and the second switching tube to be switched off and the second voltage conversion module to be switched on, so that the power battery supplies power to the second motor.
Optionally, the input end of the second voltage conversion module is connected with the power battery;
if it is determined that the power battery is required to supply power to the first motor and/or the second motor, the method controls the voltage adjustment module, the first voltage conversion module and the second voltage conversion module to enable the power battery to supply power as required, and includes: if it is determined that a power battery is needed to supply power to the first motor and the second motor, controlling the first switching tube to be connected, the second switching tube to be disconnected, the first voltage conversion module to be disconnected, and the second voltage conversion module to be connected, so that the power battery supplies power to the second motor and stores energy for the inductor; and if the current in the inductor reaches a preset value, controlling the first voltage conversion module to be conducted so that the power battery supplies power for the first motor.
Optionally, the method further comprises: if the power battery needs to be charged, controlling a direct current charging switch module and the voltage adjusting module to enable a direct current power supply to charge the power battery through the direct current charging switch module and the voltage adjusting module;
the direct current charging switch module is connected with the second end of the voltage adjusting module, and the direct current charging switch module is used for connecting or disconnecting the direct current power supply with the voltage adjusting module.
Optionally, the dc charging switch module includes a first relay, a second relay, and a charging capacitor, a first end of the charging capacitor is connected to a second end of the inductor through the first relay, a second end of the charging capacitor is connected to a source of the second switching tube through the second relay, and two ends of the charging capacitor are used for connecting the dc power supply;
if it is determined that the power battery needs to be charged, controlling the direct-current charging switch module and the voltage adjusting module to enable the direct-current power supply to charge the power battery through the direct-current charging switch module and the voltage adjusting module, and the method comprises the following steps: if the power battery needs to be charged, the first switch tube and the second switch tube are controlled to be switched off, the first relay and the second relay are controlled to be switched on, and the first voltage conversion module and the second voltage conversion module are controlled to be switched off, so that the direct-current power supply charges the power battery through the direct-current charging switch module and the voltage adjustment module.
Optionally, a first end of a second bus capacitor is connected to a second end of the inductor, and a second end of the second bus capacitor is connected to the source of the second switching tube;
the method further comprises the following steps: if the power battery needs to be heated, controlling the first voltage conversion module and the second voltage conversion module to be switched off, the first switch tube to be switched on and the second switch tube to be switched off; and if the current in the inductor reaches a preset value, controlling the first switching tube to be switched off, so that the power battery and the inductor are subjected to cyclic charging and discharging, and heating the power battery.
The present disclosure also provides a vehicle, which includes a power battery, a first motor, a second motor and the above energy conversion device provided by the present disclosure.
Through the technical scheme, the high-voltage battery can be used for selectively supplying power to the low-voltage motor (the first motor) and/or the high-voltage motor (the second motor), so that the motors with different voltage platforms are driven, and the high-voltage battery power supply system is suitable for flexible power supply of vehicles with the high-voltage battery.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a block diagram of an energy conversion device provided in an exemplary embodiment;
FIG. 2 is a circuit schematic of an energy conversion device provided by an exemplary embodiment;
FIG. 3 is a circuit schematic of an energy conversion device provided by another exemplary embodiment;
FIG. 4 is a flow diagram of a method of energy conversion provided by an exemplary embodiment;
FIG. 5 is a schematic diagram of an exemplary embodiment providing power to a first motor;
FIG. 6 is a schematic diagram of an exemplary embodiment providing power to a second motor;
FIG. 7 is a schematic diagram of an exemplary embodiment providing power to a first motor and a second motor;
FIG. 8 is a schematic diagram of charging a power battery provided in an exemplary embodiment;
fig. 9a and 9b are schematic diagrams illustrating heating of a power cell according to an exemplary embodiment.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
The energy conversion device of the present disclosure is applied to a vehicle-mounted power battery, and fig. 1 is a block diagram of the energy conversion device provided by an exemplary embodiment. As shown in fig. 1, the energy conversion apparatus 100 may include a voltage adjustment module 20, a first voltage conversion module 30, a second voltage conversion module 40, and a controller 50.
The first end of the voltage adjusting module 20 is connected to the power battery 10, and the voltage adjusting module 20 is configured to step down the output voltage of the power battery 10 and then output the output voltage from the second end of the voltage adjusting module 20. The input end of the first voltage conversion module 30 is connected to the second end of the voltage adjustment module 20, and the first voltage conversion module 30 is configured to convert the direct current into the alternating current and supply the alternating current to the first motor 60. The input end of the second voltage conversion module 40 is connected to the second end of the power battery 10 or the voltage adjustment module 20, and the second voltage conversion module 40 is configured to convert the direct current into the alternating current and supply the alternating current to the second motor 70.
The controller 50 is configured to control the voltage adjusting module 20, the first voltage converting module 30 and the second voltage converting module 40 to enable the power battery 10 to supply power as required if it is determined that the power battery 10 is required to supply power to the first motor 60 and/or the second motor 70.
The power battery 10 may be a high voltage power battery, such as 800V. The first motor 60 may be a low voltage motor.
If the input terminal of the second voltage conversion module 40 is connected to the power battery 10, the second motor 70 may be a high voltage motor (as shown in fig. 1). At this time, the power battery 10 may flexibly supply power to the high-voltage motor and/or the low-voltage motor.
If the input terminal of the second voltage conversion module 40 is connected to the second terminal of the voltage adjustment module 20, the second motor 70 may be a low voltage motor, or may be the same as the first motor 60. At this time, the power battery 10 can flexibly supply power for the two low-voltage motors.
Through the technical scheme, the high-voltage battery can be used for selectively supplying power to the low-voltage motor (the first motor) and/or the high-voltage motor (the second motor), so that the motors with different voltage platforms are driven, and the high-voltage battery power supply system is suitable for flexible power supply of vehicles with the high-voltage battery.
Fig. 2 is a schematic circuit diagram of an energy conversion device according to an exemplary embodiment. As shown in fig. 2, the voltage adjusting module 20 may include a first switch tube S1, a second switch tube S2, a first diode D1, a second diode D2, and an inductor L1.
The drain electrode of the first switching tube S1 is connected with the positive electrode of the power battery 10; the source electrode of the second switching tube S2 is connected with the negative electrode of the power battery 10, and the source electrode of the first switching tube S1 is connected with the drain electrode of the second switching tube S2; the anode of the first diode D1 is connected with the source electrode of the first switch tube S1, and the cathode of the first diode D1 is connected with the drain electrode of the first switch tube S1; the anode of the second diode D2 is connected to the source of the second switching tube S2, and the cathode of the second diode D2 is connected to the drain of the second switching tube S2; a first end of the inductor L1 is connected to the source of the first switching tube S1, and a second end of the inductor L1 is connected to the first voltage conversion module 30. The drain of the first switch tube S1 and the source of the second switch tube S2 form a first end of the voltage adjustment module 20, and the second end of the inductor L1 and the source of the second switch tube S2 form a second end of the voltage adjustment module 20.
The combination of the first switch tube S1 and the first diode D1, and the combination of the second switch tube S2 and the second diode D2 may be, for example, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or the like.
The voltage output by the power battery 10 can be subjected to the voltage reduction action of the inductor L1, and the voltage after voltage reduction is output at the second end of the inductor L1 to supply power to the first motor 60.
The controller 50 may control the first switching tube S1, the second switching tube S2, the first voltage conversion module 30, and the second voltage conversion module 40 to control the power battery 10 to supply power to the first motor 60 and/or the second motor 70.
As shown in fig. 2, the first voltage conversion module 30 and the second voltage conversion module 40 may be a three-phase full bridge circuit. The first voltage conversion module 30 may include six switching tubes (S5-S10), and corresponding diodes. The second voltage conversion module 40 may include six switching tubes (S11-S16), and corresponding diodes. The internal structure of the three-phase full bridge circuit and the connection relationship between the three-phase full bridge circuit and the voltage regulation module 20 and the motor are not described in detail herein.
As shown in fig. 2, the energy conversion device 100 may further include a first bus capacitor C1. The first end of the first bus capacitor C1 is connected to the positive electrode of the power battery 10, and the second end of the first bus capacitor C1 is connected to the negative electrode of the power battery 10. The energy conversion device 100 may further include a second bus capacitor C2. The first end of the second bus capacitor C2 is connected to the second end of the inductor L1, and the second end of the second bus capacitor C2 is connected to the source of the second switch tube S2. The first bus capacitor C1 and the second bus capacitor C2 can both play a role in filtering and stabilizing voltage.
As shown in fig. 2, the energy conversion apparatus 100 may further include a dc charging switch module 80.
The dc charging switch module 80 is connected to the second end of the voltage adjusting module 20, and is used for connecting or disconnecting the dc power supply to the voltage adjusting module 20. The controller 50 is further configured to control the dc charging switch module 80 and the voltage adjusting module 20, so that the dc power supply charges the power battery 10 through the dc charging switch module 80 and the voltage adjusting module 20.
The dc charging switch module 80 may be connected to a dc charging gun, which may be used as a dc power source to charge the power battery 10. When the dc power source charges the power battery 10, the current direction in the voltage adjusting module 20 is opposite to that when the power battery 10 supplies power to the first motor 60. The voltage regulation module 20 functions to boost the voltage when the dc power supply charges the power battery 10.
As shown in fig. 2, the dc charging switch module 80 includes a first relay S3, a second relay S4, and a charging capacitor C3. The first end of the charging capacitor C3 is connected with the second end of the inductor L1 through the first relay S3, the second end of the charging capacitor C3 is connected with the source electrode of the second switch tube S2 through the second relay S4, and the two ends of the charging capacitor C3 are also used for being connected with a direct-current power supply. Namely, the first relay S3 and the second relay S4 are respectively used as a main positive switch and a main negative switch.
The controller 50 is further configured to, if it is determined that the power battery 10 needs to be charged, control the first switching tube S1 and the second switching tube S2 to be turned off, the first relay S3 and the second relay S4 to be turned on, and the first voltage conversion module 30 and the second voltage conversion module 40 to be turned off, so that the dc power supply charges the power battery 10 through the dc charging switching module 80 and the voltage adjustment module 20.
The topology circuit designed in this way also utilizes the boosting effect of the voltage adjusting module 20 to add the function of charging the power battery 10 on the basis of supplying power to the high/low voltage motor.
In the case that the energy conversion device 100 includes the second bus capacitor C2, the controller 50 may be further configured to control the voltage adjustment module 20 to charge and discharge the power battery 10 through the inductor L1 and the second bus capacitor C2 to achieve heating of the power battery 10 if it is determined that heating of the power battery 10 is required, and a specific control method is described in detail below.
Fig. 3 is a circuit schematic diagram of an energy conversion device provided by another exemplary embodiment. Unlike fig. 2, in fig. 3, the input terminal of the second voltage conversion module 40 is connected to the second terminal of the voltage adjustment module 20, that is, the input voltage of the second voltage conversion module 40 is the same as the input voltage of the first voltage conversion module 30.
The first motor 60 and the second motor 70 are both low voltage motors.
The disclosure also provides an energy conversion method applied to the vehicle-mounted power battery. The description of the method of the present disclosure takes fig. 2 as an example. FIG. 4 is a flow chart of a method of energy conversion provided by an exemplary embodiment. As shown in fig. 4, on the basis of the foregoing energy conversion apparatus 100 provided by the present disclosure, the method may include step S11: if it is determined that the power battery 10 is required to supply power to the first motor 60 and/or the second motor 70, the voltage adjusting module 20, the first voltage conversion module 30 and the second voltage conversion module 40 are controlled to supply power to the power battery 10 as required.
Through the technical scheme, the high-voltage battery can be used for selectively supplying power to the low-voltage motor (the first motor) and/or the high-voltage motor (the second motor), so that the motors with different voltage platforms are driven, and the high-voltage battery power supply system is suitable for flexible power supply of vehicles with the high-voltage battery.
In another embodiment, on the basis of fig. 4, if it is determined that the power battery 10 is needed to supply power to the first motor 60 and/or the second motor 70, the step S11 of controlling the voltage adjusting module 20, the first voltage converting module 30, and the second voltage converting module 40 to enable the power battery 10 to supply power as required may include: if it is determined that the power battery 10 is required to supply power to the first motor 60, the first switching tube S1 is controlled to be turned on, the second switching tube S2 is controlled to be turned off, and the first voltage conversion module 30 and the second voltage conversion module 40 are controlled to be turned off, so that the power battery stores energy for the inductor L1; if the current in the inductor L1 reaches a predetermined value, the first voltage conversion module 30 is controlled to be turned on, so that the power battery 10 supplies power to the first motor 60.
That is, on the branch for supplying power to the first motor 60, the inductor L1 is pre-charged with stored energy, if the current in the inductor L1 reaches the predetermined value, it may be considered that the inductor L1 is fully charged, the voltage adjustment module 20 can output a relatively stable voltage, and at this time, the first voltage conversion module 30 is controlled to be turned on, so that the power battery 10 can supply power to the first motor 60.
Fig. 5 is a schematic diagram of an exemplary embodiment providing power to the first motor 60. As shown in fig. 5, the thick line arrows indicate the current direction.
When the first switch tube S1 is turned on, the voltage adjusting module 20 is turned on, and when the first voltage converting module 30 is turned on, the electric energy output by the voltage adjusting module 20 can supply power to the first motor 60. The second voltage conversion module 40 is turned off, and the second motor 70 is turned off. In this embodiment only the first motor 60 is powered.
In this embodiment, the voltage of the high-voltage platform battery (power battery 10) is reduced through the first bus capacitor C1, the first switching tube S1, the inductor L1, and the charging capacitor C3, so as to drive the low-voltage platform motor.
This mode of operation mainly uses under the vehicle low-speed operating mode, for example city operating mode, and vehicle demand output is lower this moment, and the power demand of vehicle can be satisfied to low voltage platform motor (first motor 60), and the low voltage platform can effectively reduce the battery loss simultaneously, guarantees the continuation of the journey mileage of vehicle.
In another embodiment, on the basis of fig. 4, if it is determined that the power battery 10 is needed to supply power to the first motor 60 and/or the second motor 70, the step S11 of controlling the voltage adjusting module 20, the first voltage converting module 30, and the second voltage converting module 40 to enable the power battery 10 to supply power as required may include:
if it is determined that the power battery 10 is required to supply power to the second motor 70, the first switching tube S1 and the second switching tube S2 are controlled to be turned off and the second voltage conversion module 40 is controlled to be turned on, so that the power battery 10 supplies power to the second motor 70.
Fig. 6 is a schematic diagram of an exemplary embodiment providing power to the second motor 70. As shown in fig. 6, the thick line arrows indicate the current direction.
When the first switching tube S1 and the second switching tube S2 are turned off, the voltage adjusting module 20 cuts off the power battery 10 from the first voltage conversion module 30, and the second voltage conversion module 40 is turned on, so that the power battery 10 is connected to the second motor 70. In this embodiment only the second motor 70 is powered.
The working mode is mainly used under the working condition that the vehicle runs at a high speed, and the second motor 70 is high in voltage platform and is easier to output high power, so that the vehicle has better performance on dynamic property.
In another embodiment, on the basis of fig. 4, if it is determined that the power battery 10 is needed to supply power to the first motor 60 and/or the second motor 70, the step S11 of controlling the voltage adjusting module 20, the first voltage converting module 30, and the second voltage converting module 40 to enable the power battery 10 to supply power as required may include:
if it is determined that the power battery 10 is required to supply power to the first motor 60 and the second motor 70, the first switching tube S1 is controlled to be turned on, the second switching tube S2 is controlled to be turned off, the first voltage conversion module 30 is controlled to be turned off, and the second voltage conversion module 40 is controlled to be turned on, so that the power battery 10 supplies power to the second motor 70 and stores energy for the inductor L1; if the current in the inductor L1 reaches a predetermined value, the first voltage conversion module 30 is controlled to be turned on, so that the power battery 10 supplies power to the first motor 60.
That is, if it is determined that the power battery 10 is required to supply power to the first motor 60 and the second motor 70, the second motor 70 may be immediately supplied by controlling the first switch tube S1 to be turned on, the second switch tube S2 to be turned off, and the second voltage conversion module 40 to be turned on. The power supply to the first motor 60 still needs to pre-charge the inductor L1 with stored energy. If the current in the inductor L1 reaches the predetermined value, it may be considered that the inductor L1 is fully charged, the voltage adjustment module 20 can output a relatively stable voltage, and at this time, the first voltage conversion module 30 is controlled to be turned on, so that the power battery 10 can supply power to the first motor 60.
Fig. 7 is a schematic diagram of an exemplary embodiment providing power to a first motor 60 and a second motor 70. The bold line arrows indicate the current direction.
The first switching tube S1, the first voltage conversion module 30 and the second voltage conversion module 40 are conducted to conduct the power battery 10 with the first motor 60 and the second motor 70. In this embodiment, power is supplied to both the first motor 60 and the second motor 70.
In this mode of operation there are two current loops. The first loop is that the voltage of the power battery 10 passes through a first bus capacitor C1 to drive a high-voltage platform motor (a second motor 70); the second loop is that the voltage of the power battery 10 passes through the first bus capacitor C1, the first switching tube S1, the inductor L1, and the charging capacitor C3 to drive the low-voltage platform motor (the first motor 60). The working mode is dual-motor hybrid driving.
This mode can use under the vehicle rapid acceleration operating mode, because the vehicle needs to improve the speed fast, the required output power of vehicle this moment is higher, is provided energy by two motors to the vehicle simultaneously, makes the dynamic behavior of vehicle reach the biggest.
In yet another embodiment, the method may further comprise: if it is determined that the power battery 10 needs to be charged, the dc charging switch module 80 and the voltage adjusting module 20 are controlled to enable the dc power supply to charge the power battery 10 through the dc charging switch module 80 and the voltage adjusting module 20.
Specifically, if it is determined that the power battery 10 needs to be charged, the first switch tube S1 and the second switch tube S2 are controlled to be turned off, the first relay S3 and the second relay S4 are controlled to be turned on, the first voltage conversion module 30 and the second voltage conversion module 40 are controlled to be turned off, energy is filtered and stabilized by the charging capacitor C3 from the charging port, voltage is boosted by the inductor L1 and the first diode D1, and the voltage is boosted by the first bus capacitor C1, so that the dc power supply charges the power battery 10 through the dc charging switch module 80 and the voltage adjustment module 20.
Due to the adoption of the high-voltage battery pack, ultra-fast charging can be realized in time, and 80% of electric quantity can be charged within 15-30 minutes.
FIG. 8 is a schematic diagram of charging a power battery provided by an exemplary embodiment. The bold line arrows indicate the current direction. When the first switch S1 is turned off, the current flows to the positive electrode of the power battery 10 through the first diode D1 to complete charging.
In case a second bus capacitance C2 is provided, the method further comprises: if it is determined that the power battery 10 needs to be heated, the voltage adjustment module 20 is controlled to charge and discharge the power battery 10 through the inductor L1 and the second bus capacitor C2, so as to heat the power battery 10.
Specifically, fig. 9a and 9b are schematic diagrams of heating the power cell 10 according to an exemplary embodiment. If it is determined that the power cell 10 needs to be heated, there may be two implementation steps.
Step 1, controlling the first voltage conversion module 30 and the second voltage conversion module 40 to be turned off, the first switch tube S1 to be turned on, and the second switch tube S2 to be turned off. At this time, the power battery 10 charges the inductor L1, the bus voltage is applied to the ends of the first bus capacitor C1 and the charging capacitor C3, and when the current of the inductor L1 reaches a predetermined value, the charging process of the inductor L1 is ended, as shown in fig. 9a, and the thick arrow indicates the current direction.
And step 2, if the current in the inductor L1 reaches a predetermined value, controlling the first switching tube S1 to be turned off, and at this time, the second bus capacitor C2 may serve as an energy source, and through the boost circuit (the voltage adjustment module 20), the current flows from the inductor L1 to the positive electrode of the power battery to generate a reverse current. As shown in fig. 9b, the thick line arrows indicate the current direction.
After one working period, the circuit enters step 1 again to cycle, so that the power battery 10 and the inductor L1 are charged and discharged circularly to realize heating of the power battery 10.
The above embodiments can be combined with each other without contradiction, and an energy conversion device and method integrating high/low voltage platform motor drive are formed, the device can have a direct current quick charging function, can realize multiple types of drive of single motor drive (including a high voltage platform motor, a low voltage platform motor) and double motor drive (double high platform motors, double platform motors and double high and low platform hybrid motors), can generate alternating current in a circuit, and can realize the effect of battery heating by using a battery resistor.
The present disclosure also provides a vehicle including the power battery 10, the first motor 60, the second motor 70, and the above-described energy conversion apparatus 100 provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (14)

1. An energy conversion device applied to a vehicle-mounted power battery is characterized by comprising:
the first end of the voltage adjusting module is connected with the power battery, and the voltage adjusting module is used for reducing the output voltage of the power battery and then outputting the reduced output voltage from the second end of the voltage adjusting module;
the input end of the first voltage conversion module is connected with the second end of the voltage adjustment module, and the first voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the first motor;
the input end of the second voltage conversion module is connected with the second end of the power battery or the second end of the voltage adjustment module, and the second voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to a second motor;
and the controller is configured to control the voltage adjusting module, the first voltage conversion module and the second voltage conversion module to enable the power battery to supply power as required if the power battery is determined to be required to supply power for the first motor and/or the second motor.
2. The apparatus of claim 1, wherein the voltage adjustment module comprises:
the drain electrode of the first switching tube is connected with the positive electrode of the power battery;
a source electrode of the second switching tube is connected with a negative electrode of the power battery, and a source electrode of the first switching tube is connected with a drain electrode of the second switching tube;
the anode of the first diode is connected with the source electrode of the first switching tube, and the cathode of the first diode is connected with the drain electrode of the first switching tube;
the anode of the second diode is connected with the source electrode of the second switching tube, and the cathode of the second diode is connected with the drain electrode of the second switching tube;
the first end of the inductor is connected with the source electrode of the first switch tube, the second end of the inductor is connected with the first voltage conversion module, the drain electrode of the first switch tube and the source electrode of the second switch tube form the first end of the voltage adjustment module, and the second end of the inductor and the source electrode of the second switch tube form the second end of the voltage adjustment module.
3. The apparatus of claim 2, further comprising:
a first end of the first bus capacitor is connected with the positive electrode of the power battery, and a second end of the first bus capacitor is connected with the negative electrode of the power battery;
and/or the presence of a gas in the gas,
and the first end of the second bus capacitor is connected with the second end of the inductor, and the second end of the second bus capacitor is connected with the source electrode of the second switching tube.
4. The apparatus of claim 2, further comprising:
the direct current charging switch module is connected with the second end of the voltage adjusting module and used for connecting or disconnecting a direct current power supply with the voltage adjusting module;
the controller is further configured to control the direct current charging switch module and the voltage adjusting module to enable the direct current power supply to charge the power battery through the direct current charging switch module and the voltage adjusting module if it is determined that the power battery needs to be charged.
5. The device of claim 4, wherein the dc charging switch module comprises a first relay, a second relay and a charging capacitor, a first end of the charging capacitor is connected to a second end of the inductor through the first relay, a second end of the charging capacitor is connected to a source of the second switch tube through the second relay, and two ends of the charging capacitor are used for connecting the dc power supply;
the controller is further configured to control the first switching tube and the second switching tube to be turned off, the first relay and the second relay to be turned on, and the first voltage conversion module and the second voltage conversion module to be turned off if it is determined that the power battery needs to be charged, so that a direct-current power supply charges the power battery through the direct-current charging switching module and the voltage adjustment module.
6. The apparatus of claim 2, further comprising:
a first end of the second bus capacitor is connected with a second end of the inductor, and a second end of the second bus capacitor is connected with a source electrode of the second switching tube;
the controller is further configured to control the voltage adjusting module to charge and discharge the power battery through the inductor and the second bus capacitor to heat the power battery if it is determined that the power battery needs to be heated.
7. An energy conversion method is applied to a vehicle-mounted power battery, and is characterized by comprising the following steps:
if the power battery is needed to supply power for the first motor and/or the second motor, controlling a voltage adjusting module, a first voltage conversion module and a second voltage conversion module to enable the power battery to supply power as required;
the first end of the voltage adjusting module is connected with the power battery, and the voltage adjusting module is used for reducing the output voltage of the power battery and then outputting the reduced output voltage from the second end of the voltage adjusting module; the input end of the first voltage conversion module is connected with the second end of the voltage adjustment module, and the first voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the first motor; the input end of the second voltage conversion module is connected with the power battery or the second end of the voltage adjustment module, and the second voltage conversion module is used for converting direct current into alternating current and supplying the alternating current to the second motor.
8. The method of claim 7, wherein the voltage regulation module comprises a first switch tube, a second switch tube, a first diode, a second diode and an inductor, wherein a drain of the first switch tube is connected to an anode of the power battery; the source electrode of the second switch tube is connected with the negative electrode of the power battery, and the source electrode of the first switch tube is connected with the drain electrode of the second switch tube; the anode of the first diode is connected with the source electrode of the first switch tube, and the cathode of the first diode is connected with the drain electrode of the first switch tube; the anode of the second diode is connected with the source electrode of the second switching tube, and the cathode of the second diode is connected with the drain electrode of the second switching tube; the first end of the inductor is connected with the source electrode of the first switching tube, and the second end of the inductor is connected with the first voltage conversion module; the input end of the second voltage conversion module is connected with the power battery;
if the power battery is needed to supply power to the first motor and/or the second motor, the voltage adjusting module, the first voltage conversion module and the second voltage conversion module are controlled to enable the power battery to supply power as required, and the method comprises the following steps:
if it is determined that a power battery is needed to supply power to the first motor, the first switching tube is controlled to be switched on, the second switching tube is controlled to be switched off, and the first voltage conversion module and the second voltage conversion module are controlled to be switched off so that the power battery stores energy for the inductor;
and if the current in the inductor reaches a preset value, controlling the first voltage conversion module to be conducted so that the power battery supplies power for the first motor.
9. The method of claim 8, wherein the input of the second voltage conversion module is connected to the power battery;
if the power battery is needed to supply power to the first motor and/or the second motor, the voltage adjusting module, the first voltage conversion module and the second voltage conversion module are controlled to enable the power battery to supply power as required, and the method comprises the following steps:
and if the power battery is required to supply power to the second motor, controlling the first switching tube and the second switching tube to be switched off and the second voltage conversion module to be switched on, so that the power battery supplies power to the second motor.
10. The method of claim 8, wherein the input of the second voltage conversion module is connected to the power battery;
if the power battery is needed to supply power to the first motor and/or the second motor, the voltage adjusting module, the first voltage conversion module and the second voltage conversion module are controlled to enable the power battery to supply power as required, and the method comprises the following steps:
if it is determined that a power battery is needed to supply power to the first motor and the second motor, controlling the first switching tube to be connected, the second switching tube to be disconnected, the first voltage conversion module to be disconnected, and the second voltage conversion module to be connected, so that the power battery supplies power to the second motor and stores energy for the inductor;
and if the current in the inductor reaches a preset value, controlling the first voltage conversion module to be conducted so that the power battery supplies power for the first motor.
11. The method of claim 8, further comprising:
if the power battery needs to be charged, controlling a direct current charging switch module and the voltage adjusting module to enable a direct current power supply to charge the power battery through the direct current charging switch module and the voltage adjusting module;
the direct current charging switch module is connected with the second end of the voltage adjusting module, and the direct current charging switch module is used for connecting or disconnecting the direct current power supply with the voltage adjusting module.
12. The method according to claim 11, wherein the dc charging switch module comprises a first relay, a second relay and a charging capacitor, a first end of the charging capacitor is connected to a second end of the inductor through the first relay, a second end of the charging capacitor is connected to a source electrode of the second switch tube through the second relay, and two ends of the charging capacitor are connected to the dc power supply;
if it is determined that the power battery needs to be charged, controlling a direct-current charging switch module and a voltage adjusting module to enable a direct-current power supply to charge the power battery through the direct-current charging switch module and the voltage adjusting module, including: if the power battery needs to be charged, the first switching tube and the second switching tube are controlled to be switched off, the first relay and the second relay are controlled to be switched on, and the first voltage conversion module and the second voltage conversion module are controlled to be switched off, so that the direct-current power supply charges the power battery through the direct-current charging switching module and the voltage adjustment module.
13. The method of claim 8, wherein a first terminal of a second bus capacitor is connected to a second terminal of the inductor, and a second terminal of the second bus capacitor is connected to a source of the second switch tube;
the method further comprises the following steps: if the power battery needs to be heated, controlling the first voltage conversion module and the second voltage conversion module to be switched off, the first switch tube to be switched on and the second switch tube to be switched off; and if the current in the inductor reaches a preset value, controlling the first switching tube to be switched off, so that the power battery and the inductor are subjected to cyclic charging and discharging, and heating the power battery.
14. A vehicle, characterized in that the vehicle comprises a power battery, a first electric machine, a second electric machine, and an energy conversion device according to any one of claims 1-6.
CN202110672235.5A 2021-06-17 2021-06-17 Energy conversion device, control method thereof and vehicle Pending CN115489387A (en)

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