CN114074561B - Energy conversion device, operation method thereof and electric automobile - Google Patents

Energy conversion device, operation method thereof and electric automobile Download PDF

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Publication number
CN114074561B
CN114074561B CN202010842456.8A CN202010842456A CN114074561B CN 114074561 B CN114074561 B CN 114074561B CN 202010842456 A CN202010842456 A CN 202010842456A CN 114074561 B CN114074561 B CN 114074561B
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battery
charging
motor
bridge arm
switch
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CN114074561A (en
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凌和平
闫磊
熊永
洪臣
张俊伟
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BYD Co Ltd
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BYD Co Ltd
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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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/30—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed with means to change over to human control
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The application discloses an energy conversion device and operation method thereof, electric automobile, include: the motor module is characterized in that a motor inverter in the motor module is connected with a battery, a first end of a motor winding is connected with an alternating current output end of the motor inverter, a second end of the motor winding is connected with a first end of a first switch, a second end of the first switch is connected with a midpoint of a first bridge arm, a first end of a bus capacitor, the first end of the first bridge arm and an anode of a direct current charging port are commonly connected, and a second end of the bus capacitor, a second end of the first bridge arm, a cathode of the direct current charging port and a cathode confluence end of the inverter are commonly connected; and the controller is used for controlling the motor module according to the operation instruction of the working mode so as to enable the energy conversion device to operate in the corresponding working mode, wherein the working mode comprises a motor driving mode, a battery charging mode and a battery self-heating mode. The energy conversion device, the operation method thereof and the electric automobile reduce the complexity of the high-voltage distribution system of the electric automobile.

Description

Energy conversion device, operation method thereof and electric automobile
Technical Field
The invention relates to the technical field of vehicles, in particular to the technical field of new energy automobiles, and especially relates to an energy conversion device, an operation method thereof and an electric automobile.
Background
Existing electric vehicles have a plurality of functional modules, such as, but not limited to, a direct current charging module, a power driving module, a battery heating module, and the like, connected to a battery module. The plurality of functional modules are independently connected in parallel on the high-voltage loop of the battery module, so that the complexity of the high-voltage power distribution system is increased, and the difficulty in arrangement of the plurality of functional modules on an automobile is high due to the fact that the plurality of functional modules are provided with a plurality of components, and the manufacturing cost of the automobile is high. In addition, the battery heating module heats the vehicle-mounted battery by an external heating mode, such as but not limited to wind heating or water heating, which also results in high manufacturing cost of the vehicle-mounted battery heating device and poor heating effect, so that the vehicle-mounted battery needs to consume larger electric quantity in the heating operation.
Disclosure of Invention
In view of the foregoing drawbacks or shortcomings in the prior art, it is desirable to provide an energy conversion device, a method of operating the same, and an electric vehicle.
In a first aspect, the present application provides an energy conversion device comprising:
the motor module comprises a motor inverter, a motor winding, a first switch, a first bridge arm, a bus capacitor and a direct current charging port, wherein the positive electrode confluence end of the motor inverter is connected with the positive electrode of the battery, the negative electrode confluence end of the motor inverter is connected with the negative electrode of the battery, the first end of the motor winding is connected with the alternating current output end of the motor inverter, the second end of the motor winding is connected with the first end of the first switch, the second end of the first switch is connected with the middle point of the first bridge arm, the first end of the bus capacitor, the first end of the first bridge arm and the positive electrode of the direct current charging port are connected together, and the second end of the bus capacitor, the second end of the first bridge arm, the negative electrode of the direct current charging port and the negative electrode confluence end of the inverter are connected together;
And the controller is used for controlling the motor module according to the operation instruction of the operation mode to enable the energy conversion device to operate in a corresponding operation mode, wherein the operation mode comprises a motor driving mode for enabling the motor to output torque, a battery charging mode for enabling the charging equipment to charge the battery and a battery self-heating mode for enabling the battery to be charged and discharged repeatedly.
Further, the inverter comprises at least one phase of bridge arm, wherein the bridge arm comprises an upper bridge arm and a lower bridge arm;
when the energy conversion device operates in a motor driving mode, the controller controls the first switch to be turned off so that the battery, the motor inverter and the motor winding form a motor driving circuit;
when the energy conversion device runs in a battery charging mode, the controller controls the first switch to be conducted so that the charging equipment, the direct-current charging port, the first bridge arm, the first switch, the motor winding, the motor inverter and the battery form a battery charging circuit for the charging equipment to charge the battery;
when the energy conversion device runs in a battery self-heating mode, the controller controls the first switch to be conducted so as to enable the bus capacitor, the first bridge arm, the first switch and the motor winding, the motor inverter and the battery form a battery heating circuit for heating the battery, and the battery and the bus capacitor are charged and discharged through controlling the motor inverter and the first bridge arm so as to achieve self-heating of the battery.
Further, the battery self-heating mode includes:
in the battery discharging and bus capacitor charging stage, the controller controls the first switch and the upper bridge arm of the motor inverter to be conducted and controls the lower bridge arm of the first bridge arm to be turned off, so that the battery, the upper bridge arm of the motor inverter, the motor winding, the first switch, the upper bridge arm of the first bridge arm and the bus capacitor form a first battery heating loop for discharging the battery and charging the bus capacitor;
and in the stage of battery charging and bus capacitor discharging, the controller controls the first switch and the upper bridge arm of the first bridge arm to be conducted and controls the lower bridge arm of the motor inverter to be turned off, so that the bus capacitor, the upper bridge arm of the first bridge arm, the first switch, the motor winding, the upper bridge arm of the motor inverter and the battery form a second battery heating loop for charging the battery and discharging the bus capacitor.
Further, the battery self-heating mode further includes:
in the battery discharging and motor winding charging stage, the controller controls the first switch, the upper bridge arm of the inverter and the lower bridge arm of the first bridge arm to be conducted, so that the battery, the upper bridge arm of the inverter, the motor winding, the first switch and the lower bridge arm of the first bridge arm form a third battery heating loop for discharging the battery and charging the motor winding.
Further, the battery self-heating mode further includes:
in the motor winding discharging and bus capacitor charging stage, the controller controls the first switch to be turned on and controls the lower bridge arm of the first bridge arm to be turned off, so that the motor winding, the first switch, the upper bridge arm of the first bridge arm, the bus capacitor and the lower bridge arm of the motor inverter form a fourth battery heating loop for discharging the motor winding and charging the bus capacitor.
Further, the battery self-heating mode further includes:
and in the stage of discharging the bus capacitor and charging the motor windings, the controller controls the first switch, the upper bridge arm of the first bridge arm and the lower bridge arm of the motor inverter to be conducted so that the bus capacitor, the upper bridge arm of the first bridge arm, the first switch, the motor windings and the lower bridge arm of the motor inverter form a fifth battery heating loop for discharging the bus capacitor and charging the motor windings.
Further, the battery charging mode includes:
in the charging stage of discharging the charging equipment and charging the battery, the controller controls the first switch and the upper bridge arm of the first bridge arm to be conducted and controls the lower bridge arm of the motor inverter to be turned off, so that the direct-current charging port, the upper bridge arm of the first bridge arm, the first switch, the motor winding, the upper bridge arm of the motor inverter and the battery form a first battery charging loop for discharging the charging equipment and charging the battery.
Further, the battery charging mode further includes:
in the charging stage of the charging equipment, the controller controls the first switch, the upper bridge arm of the first bridge arm and the lower bridge arm of the motor inverter to be conducted so that the direct current charging port, the upper bridge arm of the first bridge arm, the first switch, the motor winding and the lower bridge arm of the motor inverter form a second battery charging loop for discharging the charging equipment and charging the motor winding.
Further, a second switch is connected in series between the first end of the first capacitor and the positive electrode of the direct current charging port and/or between the second end of the first capacitor and the negative electrode of the direct current charging port;
when the energy conversion device operates in a motor driving mode or a battery self-heating mode, the controller controls the second switch to be turned off, and when the energy conversion device operates in a battery charging mode, the controller controls the second switch to be turned on.
Further, the method further comprises the following steps:
the temperature detection module is used for detecting the temperature value of the battery;
the charging detection module is used for detecting whether the direct-current charging port is connected with charging equipment or not;
the controller is further used for judging whether the temperature value is lower than a preset temperature threshold value, generating an operation instruction of the battery self-heating mode when the temperature value is lower than the temperature threshold value until the temperature value reaches the temperature threshold value, generating an operation instruction of the battery charging mode when the temperature value is greater than or equal to the temperature threshold value and the direct current charging port is connected with the charging equipment, and generating an operation instruction of the motor driving mode when the temperature value is greater than or equal to the temperature threshold value and the direct current charging port is not connected with the charging equipment.
In a second aspect, the present application further provides a method of operating an energy conversion device, the method of operating comprising:
receiving an operation instruction of a working mode;
and controlling a motor module in the energy conversion device according to the operation instruction of the operation mode to enable the energy conversion device to operate in a corresponding operation mode, wherein the operation mode comprises a motor driving mode for enabling the motor to output torque, a battery charging mode for enabling the charging equipment to charge the battery or a battery self-heating mode for enabling the battery to charge and discharge repeatedly.
Further, the method further comprises the following steps:
s100: detecting a temperature value of the battery;
s200: judging whether the temperature value is lower than a preset temperature threshold value or not;
s300: if the temperature value is lower than the temperature threshold, generating an operation instruction of a battery self-heating mode, controlling the motor module according to the operation instruction of the self-heating mode to enable the energy conversion device to operate the battery self-heating mode, and if the temperature value is greater than or equal to the temperature threshold, executing step S500;
s400: repeating steps S100-S300 until the temperature value reaches a temperature threshold;
s500: detecting whether a direct current charging port in the energy conversion device is connected with charging equipment or not;
s600: if the direct current charging port is connected with the charging equipment, generating an operation instruction of a battery charging mode, controlling the motor module according to the operation instruction of the battery charging mode to enable the energy conversion device to operate the battery charging mode, and if the direct current charging port is not connected with the charging equipment, executing step S700;
S700: generating an operation instruction of the motor driving mode, and controlling the motor module according to the operation instruction of the motor driving mode to enable the energy conversion device to operate in the motor driving mode.
In a third aspect, the present application also provides an electric vehicle, including an energy conversion device.
According to the energy conversion device and the operation method thereof, and the electric automobile, states of all the switches in the motor module are controlled by the controller to realize that the energy conversion device operates in a motor driving mode, a battery charging mode or a battery self-heating mode, and the battery is heated in a self-heating mode of repeated charging and discharging, so that integration of the motor driving module, the battery heating module and the battery charging module is realized, complexity of a high-voltage distribution system of the electric automobile and the number of components in the electric automobile are reduced, installation space of a functional module on the electric automobile is saved, manufacturing cost of the electric automobile is further reduced, meanwhile, heating effect of the battery can be improved, and electric quantity consumed in a battery heating process is reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 is a block diagram of an energy conversion device according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of an energy conversion device according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a first battery heating circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a second battery heating circuit provided in an embodiment of the present application;
fig. 5 is a schematic diagram of a third battery heating circuit according to an embodiment of the present application
Fig. 6 is a schematic diagram of a fourth battery heating circuit according to an embodiment of the present application
Fig. 7 is a schematic diagram of a fifth battery heating circuit according to an embodiment of the present application
Fig. 8 is a schematic diagram of a first battery charging circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a second battery charging circuit according to an embodiment of the present disclosure;
fig. 10 is a flowchart of an operation method of the energy conversion device according to the embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
Referring to fig. 1-2, an embodiment of the present application provides an energy conversion device, including:
the motor module 200, the motor module 200 includes a motor inverter 210, a motor winding 221, a first switch 230, a first bridge arm 240, a bus capacitor 250 and a dc charging port 270, the positive electrode bus end of the motor inverter 210 is connected with the positive electrode of the battery, the negative electrode bus end of the motor inverter 210 is connected with the negative electrode of the battery, the first end of the motor winding 221 is connected with the ac output end of the motor inverter 210, the second end of the motor winding 221 is connected with the first end of the first switch 230, the second end of the first switch 230 is connected with the midpoint of the first bridge arm 240, the first end of the bus capacitor 250, the first end of the first bridge arm 240 and the positive electrode of the dc charging port 270 are commonly connected, and the second end of the bus capacitor 250, the second end of the first bridge arm 240, the negative electrode of the dc charging port 270 and the negative electrode bus end of the inverter are commonly connected;
and a controller for controlling the motor module 200 according to an operation instruction of an operation mode to operate the energy conversion device in a corresponding operation mode, the operation mode including a motor 220 driving mode for making the motor 220 output torque, a battery charging mode for making the charging device charge the battery, and a battery self-heating mode for repeatedly charging and discharging the battery.
In this embodiment, the energy conversion device includes a motor module 200 and a controller, the motor module 200 includes a motor inverter 210, a motor 220, a first switch 230, a first bridge arm 240, a bus capacitor 250 and a dc charging port 270, the motor 220 includes a motor winding 221, and the connection relationship between each component is specifically: the ac output end of the motor inverter 210 is connected to a first end of the motor winding 221, a second end of the motor winding 221 is connected to a first end of the first switch 230, a second end of the first switch 230 is connected to a midpoint of the first bridge arm 240, the first end of the bus capacitor 250 and the positive electrode of the dc charging port 270 are commonly connected, and the second end of the bus capacitor 250, the second end of the first bridge arm 240, the negative electrode of the dc charging port 270 and the negative bus end of the inverter are commonly connected. The positive and negative bus terminals of the motor inverter 210 are respectively connected with the positive and negative poles of an external battery, the motor inverter 210 can be used for converting direct current input by the battery into alternating current, and the alternating current is transmitted to the motor winding 221 through the alternating current output terminal of the motor inverter 210 to drive the motor 220 to output torque to provide power for the operation of the electric vehicle. The positive and negative poles of the dc charging port 270 may be used to connect with the positive and negative poles of an external charging device, which may charge the battery through the motor module 200 after being connected to the dc charging port 270. The controller may control the states of the respective switches in the motor module 200 according to the received operation instructions of the operation modes such that the energy conversion device has a plurality of operation modes including a motor 220 driving mode, a battery charging mode, and a battery self-heating mode. When the energy conversion device is operated in the motor 220 driving mode, the controller controls the motor module 200 to make the motor 220 output torque; when the energy conversion device is operated in the battery charging mode, the controller controls the motor module 200 to charge the battery through the motor module 200; when the energy conversion device is operated in the battery self-heating mode, the controller controls the motor module 200 to repeatedly charge and discharge the battery, thereby realizing self-heating of the battery.
The battery has a certain resistance, so that heat can be generated through the resistance when the battery is repeatedly charged, and self-heating of the battery is further realized. The self-heating mode of the battery not only needs no external heating device to simplify the structure of the electric automobile, but also has small heat loss to ensure good heating effect, thereby reducing the electric quantity consumed in the battery heating process and improving the cruising ability of the electric automobile.
In this embodiment, the state of each switch in the motor module 200 is controlled by the controller to realize that the energy conversion device operates in the motor 220 driving mode, the battery charging mode or the battery self-heating mode, and the battery heats in a self-heating mode of repeated charging and discharging, so that the integration of the motor 220 driving module, the battery heating module and the battery charging module is realized, the complexity of the high-voltage power distribution system of the electric automobile and the number of components in the electric automobile are reduced, the installation space of the functional module on the electric automobile is saved, the manufacturing cost of the electric automobile is further reduced, the heating effect of the battery is improved, and the electric quantity consumed in the battery heating process is reduced.
The midpoints of the phase legs in motor inverter 210 collectively form the ac output of motor inverter 210. Each phase of bridge arm comprises an upper bridge arm and a lower bridge arm, and power switches are arranged on the upper bridge arm and the lower bridge arm. The first bridge arm 240 includes an upper bridge arm and a lower bridge arm, and power switches are respectively disposed on the upper bridge arm and the lower bridge arm. The midpoint of the bridge arm is a common end for connecting the power switch in the upper bridge arm and the power switch in the lower bridge arm.
Motor inverter 210 may have one or more legs and motor 220 may have one or more motor windings 221, such as motor inverter 210 shown in fig. 2 having three-phase legs, motor 220 having three-phase motor windings 221, the midpoints of the three-phase legs being connected to respective first ends of three-phase motor windings 221, the second ends of three-phase motor windings 221 being commonly connected to the first ends of first switches 230.
The power switches in first leg 240 and the power switches in each phase leg of motor inverter 210 may each be IGBTs. Under the self-heating mode of the battery, the switching frequency of the power switch in the inverter is high, the requirement of high switching frequency can be met by adopting the IGBT, and the driving control circuit is simple and long in service life. In each phase leg of the first leg 240 and motor inverter 210, the E-pole of the IGBT in the upper leg and the C-pole of the IGBT in the lower leg are commonly connected to form a midpoint of the leg. In each phase leg of motor inverter 210, the C-poles of the IGBTs in the upper leg are commonly connected to form the positive bus terminal of motor inverter 210, and the E-poles of the IGBTs in the lower leg are commonly connected to form the negative bus terminal of motor inverter 210. In addition, the IGBT is provided with the diodes which are connected in reverse parallel, so that the upper bridge arm and the lower bridge arm in the bridge arms are reversible in the conducting direction. Taking the motor inverter 210 as an example, when the power switch is an IGBT, the motor inverter 210 has a current conversion function of converting direct current input from an external battery into alternating current, and also has a reverse-current direct current function of charging the external battery with direct current through a diode connected in reverse parallel. Thus, the ac output of the motor inverter 210 is not limited to output ac power, but may be used to input dc power to the motor inverter 210. Of course, the power switch is not limited to an IGBT, as long as the power switch capable of realizing the IGBT function can be used in the present application.
For distinction, the legs in the motor inverter 210 are hereinafter referred to as the second leg 211, the upper and lower legs of the legs are hereinafter referred to as the second upper leg 212 and the second lower leg 213, respectively, and the upper and lower legs of the first leg 240 are hereinafter referred to as the first upper leg 241 and the first lower leg 242, respectively. The IGBTs in the first upper leg 241 are referred to as first IGBTs 243, the IGBTs in the first lower leg 242 are referred to as second IGBTs 244, the IGBTs in the second upper leg 212 are referred to as third IGBTs 214, and the IGBTs in the second lower leg 213 are referred to as fourth IGBTs 215. The anti-parallel diode in the first IGBT243 is the first diode 2431, the anti-parallel diode in the third IGBT214 is the third diode 2141, and the anti-parallel diode in the fourth IGBT215 is the fourth diode 2151.
In some embodiments, the inverter includes at least one phase of second leg 211, second leg 211 including second upper leg 212 and second lower leg 213;
when the energy conversion device operates in the motor 220 driving mode, the controller controls the first switch 230 to be turned off so that the battery, the motor inverter 210 and the motor windings 221 form a motor 220 driving circuit;
When the energy conversion device operates in the battery charging mode, the controller controls the first switch 230 to be turned on so that the charging device, the direct current charging port 270, the first bridge arm 240, the first switch 230, the motor winding 221, the motor inverter 210 and the battery form a battery charging circuit for the charging device to charge the battery.
When the energy conversion device operates in the battery self-heating mode, the controller controls the first switch 230 to be turned on, so that the bus capacitor 250, the first bridge arm 240, the first switch 230, the motor winding 221, the motor inverter 210 and the battery form a battery heating circuit for heating the battery, and the battery and the bus capacitor 250 are charged and discharged by controlling the motor inverter 210 and the first bridge arm 240, so as to realize self-heating of the battery.
The present embodiment shows some control modes of the controller on the motor module 200 when implementing the energy conversion device in the motor 220 driving mode, the battery charging mode, and the battery self-heating mode, specifically:
when the energy conversion device operates in the motor 220 driving mode, the controller controls the first switch 230 to be turned off so that the battery, the motor inverter 210 and the motor windings 221 form a motor 220 driving circuit. At this time, the driving circuit of the motor 220 and the components of the energy conversion device, such as the first bridge arm 240, the bus capacitor 250, the dc charging port 270, etc., are all in a disconnected state. After the battery is connected to the motor inverter 210, the controller may control the motor inverter 210 to make the motor 220 output torque to power the electric vehicle.
When the energy conversion device operates in the battery charging mode, the controller controls the first switch 230 to be turned on so that the charging device, the direct current charging port 270, the first bridge arm 240, the first switch 230, the motor winding 221, the motor inverter 210 and the battery form a battery charging circuit for the charging device to charge the battery. After the battery is connected to the motor inverter 210 and the charging device is connected to the dc charging port 270, the charging device can perform dc charging on the battery through the battery charging circuit.
When the energy conversion device operates in the battery self-heating mode, the controller controls the first switch 230 to be turned on, so that the bus capacitor 250, the first bridge arm 240, the first switch 230, the motor winding 221, the motor inverter 210 and the battery form a battery heating circuit for heating the battery, and the battery and the bus capacitor 250 are charged and discharged by controlling the motor inverter 210 and the first bridge arm 240, so as to realize self-heating of the battery. After the battery is connected to the motor inverter 210, the controller may control the motor inverter 210 and the first bridge arm 240 to charge the bus capacitor 250 through the battery heating circuit and charge the battery through the battery heating circuit by the bus capacitor 250, so as to realize self-heating of the battery.
In this embodiment, the energy conversion device is simple in implementing the control process for operating the three modes.
Referring to fig. 3-4, in some embodiments, the battery self-heating mode includes:
in the battery discharging and bus capacitor 250 charging phase, the controller controls the first switch 230 and the second upper leg 212 of the motor inverter 210 to be turned on and controls the first lower leg 242 of the first leg 240 to be turned off, so that the battery, the second upper leg 212 of the motor inverter 210, the motor winding 221, the first switch 230, the first upper leg 241 of the first leg 240 and the bus capacitor 250 form a first battery heating loop for discharging the battery and charging the bus capacitor 250;
in the battery charging and bus capacitor 250 discharging phase, the controller controls the first switch 230 and the first upper arm 241 of the first arm 240 to be turned on and controls the second lower arm 213 of the motor inverter 210 to be turned off, so that the bus capacitor 250, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221, the second upper arm 212 of the motor inverter 210 and the battery form a second battery heating loop for charging the battery and discharging the bus capacitor 250.
In this embodiment, the battery self-heating mode at least includes a battery discharging and bus capacitor 250 charging stage and a battery charging and bus capacitor 250 discharging stage, and the controller can control the above two stages to perform repeated cyclic operation to realize continuous self-heating of the battery.
In the battery discharging and bus capacitor 250 charging phase, the controller controls the first switch 230 and the second upper leg 212 of the motor inverter 210 to be on and controls the first lower leg 242 of the first leg 240 to be off, so that the battery, the second upper leg 212 of the motor inverter 210, the motor windings 221, the first switch 230, the first upper leg 241 of the first leg 240, and the bus capacitor 250 form a first battery heating loop for discharging the battery and charging the bus capacitor 250. The battery charges the bus capacitor 250 through the first battery heating loop. Since the first lower bridge arm 242 is turned off, the electric quantity output by the battery flows to the bus capacitor 250 through the first diode 2431 of the first IGBT243 in the first upper bridge arm 241 after passing through the first switch 230, so as to charge the bus capacitor 250 by the battery. The first battery heating circuit is shown by an arrow in fig. 3, and the pointing direction of the arrow is the current direction in the first battery heating circuit.
In the battery charging and bus capacitor 250 discharging phase, the controller controls the first switch 230 and the first upper arm 241 of the first arm 240 to be turned on and controls the second lower arm 213 of the motor inverter 210 to be turned off, so that the bus capacitor 250, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221, the second upper arm 212 of the motor inverter 210 and the battery form a second battery heating loop for charging the battery and discharging the bus capacitor 250. The bus capacitor 250 charges the battery through the second battery heating loop. Since the second lower bridge arm 213 is turned off, the electric quantity output by the bus capacitor 250 flows to the battery through the third diode 2141 of the third IGBT214 in the second upper bridge arm 212 after passing through the motor winding 221, so as to realize that the bus capacitor 250 charges the battery. The second battery heating circuit is shown by the arrow in fig. 4, and the pointing direction of the arrow is the current direction in the second battery heating circuit.
It should be appreciated that during the battery discharging and bus capacitor 250 charging phase, a certain amount of power is charged in motor winding 221, and motor winding 221 freewheels bus capacitor 250 such that the voltage of bus capacitor 250 is greater than the battery charging voltage, to achieve charging of the rechargeable battery by bus capacitor 250 during the battery charging and bus capacitor 250 discharging phase.
In addition, due to the characteristics of the bridge arms, only one of the upper and lower bridge arms of the bridge arm can be conducted at the same time. For example, when the upper arm of the arm is in an on state, the lower arm is in an off state. In this context, the controller controls the on/off of the first upper arm 241, the first lower arm 242, the second upper arm 212, and the second lower arm 213, and essentially controls the on/off of the power switches in the upper and lower arms. For example, the controller controls the first upper leg 241 to conduct, essentially the controller controls the first IGBT243 to conduct.
Referring to fig. 5, in some embodiments, the battery self-heating mode further includes:
in the battery discharging and motor winding 221 charging phase, the controller controls the first switch 230, the second upper leg 212 of the inverter and the first lower leg 242 of the first leg 240 to conduct such that the battery, the second upper leg 212 of the inverter, the motor winding 221, the first switch 230 and the first lower leg 242 of the first leg 240 form a third battery heating loop for discharging the battery and charging the motor winding 221.
In this embodiment, the battery is discharged and the motor winding 221 charging phase can be used to achieve that the battery alone charges the motor winding 221, so that the motor winding 221 is pre-charged with a larger amount of power. The electric quantity in the motor winding 221 freewheels into the bus capacitor 250 to improve the electric quantity and voltage in the bus capacitor 250, so as to improve the charging current of the bus capacitor 250 to the battery and improve the self-heating effect of the battery.
The third battery heating circuit is shown by an arrow in fig. 5, and the pointing direction of the arrow is the current trend in the third battery heating circuit.
It should be appreciated that in this stage, more charge can be placed in the motor winding 221 than in the manner in which the battery simultaneously charges the motor winding 221 and the bus capacitor 250. In this way, when the motor winding 221 freewheels the bus capacitor 250 in the subsequent stage, the charging current of the bus capacitor 250 to the battery can be increased when the battery is charged and the bus capacitor 250 is discharged, and the self-heating effect of the battery is improved.
Referring to fig. 6, in some embodiments, the battery self-heating mode further includes:
in the charging phase of the motor winding 221 and the bus capacitor 250, the controller controls the first switch 230 to be turned on and controls the first lower leg 242 of the first leg 240 to be turned off, so that the motor winding 221, the first switch 230, the first upper leg 241 of the first leg 240, the bus capacitor 250 and the second lower leg 213 of the motor inverter 210 form a fourth battery heating loop for discharging the motor winding 221 and charging the bus capacitor 250.
In this embodiment, the motor winding 221 can charge the bus capacitor 250 through the fourth battery heating circuit, so as to increase the charging current of the capacitor to the battery during the battery charging and bus capacitor 250 discharging phases, and improve the self-heating effect of the battery.
Since the first lower bridge arm 242 is turned off, the electric quantity output by the motor winding 221 flows to the bus capacitor 250 through the first diode 2431 of the first IGBT243 in the first upper bridge arm 241 after passing through the first switch 230, and flows to the motor winding 221 through the fourth diode 2151 of the fourth IGBT215 in the second lower bridge arm 213 after passing through the bus capacitor 250, so as to realize that the motor winding 221 charges the bus capacitor 250. The fourth battery heating circuit is shown by an arrow in fig. 6, and the pointing direction of the arrow is the current direction in the fourth battery heating circuit.
Referring to fig. 7, in some embodiments, the battery self-heating mode further includes:
in the charging phase of the bus capacitor 250, the controller controls the first switch 230, the first upper arm 241 of the first arm 240, and the second lower arm 213 of the motor inverter 210 to be turned on, so that the bus capacitor 250, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221, and the second lower arm 213 of the motor inverter 210 form a fifth battery heating loop for discharging the bus capacitor 250 and charging the motor winding 221.
In the present embodiment, the bus capacitor 250 charges the motor winding 221 through the fifth battery heating circuit, so that the direction of the current in the motor winding 221 can be changed (the current direction in the motor winding 221 is opposite to the current direction in the battery discharging and the charging of the bus capacitor 250 in this stage) to realize the charging of the capacitor to the battery.
The fifth battery heating circuit is shown by an arrow in fig. 7, and the pointing direction of the arrow is the current trend in the fifth battery heating circuit.
When the battery self-heating mode includes a battery discharging and motor winding 221 charging phase, a battery discharging and bus capacitor 250 charging phase, a motor winding 221 discharging and bus capacitor 250 charging phase, a bus capacitor 250 discharging and motor winding 221 charging phase, and a battery charging and bus capacitor 250 discharging phase, the controller can control the above 5 phases to perform repeated cyclic operation at a certain frequency according to the above sequence, so as to realize continuous self-heating of the battery. In the battery discharging and motor winding 221 charging phase, when the voltage of motor winding 221 reaches the preset voltage value, the phase is switched to the battery discharging and bus capacitor 250 charging phase. In the battery discharging and bus capacitor 250 charging phase, when the voltage value of bus capacitor 250 reaches the preset voltage value, switching to the motor winding 221 discharging and bus capacitor 250 charging phase. In the motor winding 221 discharging and bus capacitor 250 charging phase, when the discharge of the electric quantity in motor winding 221 is finished, switching to the bus capacitor 250 discharging and motor winding 221 charging phase is performed. In the discharging phase of the bus capacitor 250 and the charging phase of the motor winding 221, the battery is switched to the charging phase and the discharging phase of the bus capacitor 250 when the voltage of the motor winding 221 reaches the preset voltage value.
Referring to fig. 8, in some embodiments, the battery charging mode includes:
in the charging stage, the controller controls the first switch 230 and the first upper arm 241 of the first arm 240 to be turned on and controls the second lower arm 213 of the motor inverter 210 to be turned off, so that the dc charging port 270, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221, the second upper arm 212 of the motor inverter 210 and the battery form a first battery charging loop for discharging the charging device and charging the battery.
In this embodiment, the charging device may charge the battery through the first battery charging circuit. Since the second lower bridge arm 213 is turned off, the electric quantity output by the charging device flows to the battery through the anti-parallel diode of the third IGBT214 in the second upper bridge arm 212 after passing through the motor winding 221, so as to realize charging of the battery by the charging device.
The first battery charging circuit is shown by an arrow in fig. 8, and the pointing direction of the arrow is the current direction in the first battery charging circuit.
Referring to fig. 9, in some embodiments, the battery charging mode further includes:
in the charging stage of the charging device discharging and the motor winding 221, the controller controls the first switch 230, the first upper arm 241 of the first arm 240 and the second lower arm 213 of the motor inverter 210 to be turned on, so that the dc charging port 270, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221 and the second lower arm 213 of the motor inverter 210 form a second battery charging loop for the charging device discharging and the motor winding 221 charging.
In the present embodiment, the charging device pre-charges the motor winding 221 through the second battery charging loop, so that the charging voltage and current of the battery during the discharging and charging phases of the charging device can be increased, and the charging efficiency of the battery by the charging device can be improved.
The second battery charging circuit is shown by an arrow in fig. 9, and the pointing direction of the arrow is the current trend in the second battery charging circuit.
In the charging stage of the charging device discharging and the motor winding 221, when the voltage of the motor winding 221 reaches a preset voltage value, the charging stage is switched to the charging stage of the charging device discharging and the battery charging stage.
In some embodiments, a second switch 260 is connected in series between the first end of the first capacitor and the positive pole of the dc charging port 270 and/or between the second end of the first capacitor and the negative pole of the dc charging port 270;
wherein, when the energy conversion device is operated in the motor 220 driving mode or the battery self-heating mode, the controller controls the second switch 260 to be turned off, and when the energy conversion device is operated in the battery charging mode, the controller controls the second switch 260 to be turned on.
In this embodiment, the second switch 260 is connected in series between the first end of the first capacitor and the positive electrode of the dc charging port 270 and/or between the second end of the first capacitor and the negative electrode of the dc charging port 270, so that not only can the on-off between the charging device and the motor module 200 be controlled, but also the second switch 260 can be turned off when the charging device is not connected to the dc charging port 270, so as to avoid the occurrence of electric shock, and improve the safety of the energy conversion device.
When the energy conversion device operates in the battery charging mode, the controller controls the second switch 260 to be turned on, and during the discharging and battery charging phase of the charging device, the direct current charging port 270, the second switch 260, the first upper arm 241 of the first arm 240, the first switch 230, the motor winding 221, the second upper arm 212 of the motor inverter 210 and the battery form a first battery charging loop for discharging the charging device and charging the battery; during the charging phase of the motor winding 221 and discharging of the charging device, the dc charging port 270, the second switch 260, the first upper leg 241 of the first leg 240, the first switch 230, the motor winding 221 and the second lower leg 213 of the motor inverter 210 form a second battery charging loop for discharging the charging device and charging the motor winding 221.
In the energy conversion device shown in fig. 2, a second switch 260 is connected in series between the first end of the first capacitor and the positive electrode of the dc charging port 270 and between the second end of the first capacitor and the negative electrode of the dc charging port 270.
In some embodiments, the energy conversion device further comprises:
the temperature detection module is used for detecting the temperature value of the battery;
the charging detection module is used for detecting whether the direct current charging port 270 is connected with charging equipment or not;
The controller is further configured to determine whether the temperature value is lower than a preset temperature threshold, and generate an operation instruction of the battery self-heating mode when the temperature value is lower than the temperature threshold until the temperature value reaches the temperature threshold, and generate an operation instruction of the battery charging mode when the temperature value is greater than or equal to the temperature threshold and the direct current charging port 270 is connected with the charging device, and generate an operation instruction of the motor 220 driving mode when the temperature value is greater than or equal to the temperature threshold and the direct current charging port 270 is not connected with the charging device.
In this embodiment, when the temperature value of the battery is lower than the temperature threshold, it is indicated that the battery is in a state requiring heating, and at this time, the controller generates an operation command of the self-heating mode, and the controller controls the motor module 200 according to the operation command of the self-heating mode to enable the energy conversion device to operate the battery self-heating mode until the temperature value reaches the temperature threshold. When the temperature value of the battery is greater than or equal to the temperature threshold and the direct current charging port 270 is connected with the charging device, the controller generates an operation command of the battery charging mode at this time, and the controller controls the motor module 200 according to the operation command of the battery charging mode so as to enable the energy conversion device to operate the battery charging mode. When the temperature value is greater than or equal to the temperature threshold and the direct current charging port 270 is not connected with the charging device, the controller generates an operation command of the motor 220 driving mode at this time, and the controller controls the motor module 200 according to the operation command of the motor 220 driving mode to enable the energy conversion device to operate the motor 220 driving mode. By such arrangement, it is possible to ensure that the battery is protected by performing the motor 220 driving mode or the battery charging mode after reaching a proper temperature.
The battery may be a vehicle-mounted storage battery, and the charging device may be a charging gun or the like. The temperature threshold is, for example, but not limited to, below-15 ℃.
In addition, the temperature detection module and the charge detection module may be a temperature detection module and a charge detection module in the existing vehicle-mounted battery module 100. The controller may be composed of more than two sub-controllers together, and one of the sub-controllers may be a BMC in the battery module 100. By combining and utilizing a partial structure of the battery module 100 mounted on the vehicle in this manner, the manufacturing cost of the electric vehicle can be reduced.
The BMC may be configured to determine whether the temperature value is lower than a preset temperature threshold, and generate an operation instruction of the battery self-heating mode when the temperature value is lower than the temperature threshold, until the temperature value reaches the temperature threshold, and generate an operation instruction of the battery charging mode when the temperature value is greater than or equal to the temperature threshold and the dc charging port 270 is connected with a charging device, and generate an operation instruction of the motor 220 driving mode when the temperature value is greater than or equal to the temperature threshold and the dc charging port 270 is not connected with the charging device.
The embodiment of the application also provides an operation method of the energy conversion device, which comprises the following steps:
Receiving an operation instruction of a working mode;
the motor module 200 in the energy conversion device is controlled to operate the energy conversion device in a corresponding operation mode according to an operation instruction of the operation mode, the operation mode including a motor 220 driving mode for causing the motor 220 to output torque, a battery charging mode for causing the charging apparatus to charge the battery, or a battery self-heating mode for repeatedly charging and discharging the battery.
Referring to fig. 10, in some embodiments, the method further comprises:
s100: detecting a temperature value of the battery;
s200: judging whether the temperature value is lower than a preset temperature threshold value or not;
s300: if the temperature value is lower than the temperature threshold, generating an operation command of the battery self-heating mode, controlling the motor module 200 according to the operation command of the self-heating mode to enable the energy conversion device to operate the battery self-heating mode, and if the temperature value is greater than or equal to the temperature threshold, executing step S500;
s400: repeating steps S100-S300 until the temperature value reaches a temperature threshold;
s500: detecting whether a charging device is connected to a direct current charging port 270 in the energy conversion device;
s600: if the direct current charging port 270 is connected with the charging device, generating an operation instruction of a battery charging mode, controlling the motor module 200 according to the operation instruction of the battery charging mode to enable the energy conversion device to operate the battery charging mode, and if the direct current charging port 270 is not connected with the charging device, executing step S700;
S700: an operation instruction of the motor 220 driving mode is generated, and the motor module 200 is controlled to cause the energy conversion device to operate the motor 220 driving mode according to the operation instruction of the motor 220 driving mode.
In some embodiments, controlling the motor module 200 to operate the energy conversion device in the battery self-heating mode according to the operation instruction of the self-heating mode includes:
s320: the controller controls the first switch 230 and the second upper leg 212 of the motor inverter 210 to be turned on and controls the first lower leg 242 of the first leg 240 to be turned off, so that the battery, the second upper leg 212 of the motor inverter 210, the motor winding 221, the first switch 230, the first upper leg 241 of the first leg 240 and the bus capacitor 250 form a first battery heating loop for discharging the battery and charging the bus capacitor 250;
s350: the controller controls the first switch 230 and the first upper leg 241 of the first leg 240 to be turned on and controls the second lower leg 213 of the motor inverter 210 to be turned off, so that the bus capacitor 250, the first upper leg 241 of the first leg 240, the first switch 230, the motor winding 221, the second upper leg 212 of the motor inverter 210, and the battery form a second battery heating loop for charging the battery and discharging the bus capacitor 250.
Further, before S320, the method further includes:
s310: the controller controls the first switch 230, the second upper leg 212 of the inverter and the first lower leg 242 of the first leg 240 to conduct such that the battery, the second upper leg 212 of the motor inverter 210, the motor winding 221, the first switch 230 and the first lower leg 242 of the first leg 240 form a third battery heating loop for discharging the battery and charging the motor winding 221.
Further, after S320 and before S350, further includes:
s330: the controller controls the first switch 230 to be turned on and controls the first lower leg 242 of the first leg 240 to be turned off, so that the motor winding 221, the first switch 230, the first upper leg 241 of the first leg 240, the bus capacitor 250, and the second lower leg 213 of the motor inverter 210 form a fourth battery heating loop that discharges the motor winding 221 and charges the bus capacitor 250.
Further, after S330 and before S350, the method further includes:
s340: the controller controls the first switch 230, the first upper leg 241 of the first leg 240, and the second lower leg 213 of the motor inverter 210 to be turned on such that the bus capacitor 250, the first upper leg 241 of the first leg 240, the first switch 230, the motor winding 221, and the second lower leg 213 of the motor inverter 210 form a fifth battery heating loop for discharging the bus capacitor 250 and charging the motor winding 221.
In some embodiments, controlling the motor module 200 to operate the energy conversion device in the battery charging mode according to the operation instruction of the battery charging mode includes:
s620: the controller controls the first switch 230 and the first upper leg 241 of the first leg 240 to be turned on and controls the second lower leg 213 of the motor inverter 210 to be turned off, so that the dc charging port 270, the first upper leg 241 of the first leg 240, the first switch 230, the motor winding 221, the second upper leg 212 of the motor inverter 210, and the battery form a first battery charging loop for discharging the charging device and charging the battery.
Further, before S620, the method further includes:
s610: the controller controls the first switch 230, the first upper leg 241 of the first leg 240, and the second lower leg 213 of the motor inverter 210 to be turned on such that the dc charging port 270, the first upper leg 241 of the first leg 240, the first switch 230, the motor winding 221, and the second lower leg 213 of the motor inverter 210 form a second battery charging loop for discharging the charging device and charging the motor winding 221.
In some embodiments, controlling motor module 200200 to operate the energy conversion device in motor 220 drive mode according to the operating instructions of motor 220 drive mode includes:
The first switch 230 is controlled to be turned off so that the battery, the motor inverter 210, and the motor winding 221 form a motor 220 driving circuit.
The application also provides an electric automobile, which comprises an energy conversion device.
It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied. Furthermore, although the steps of the methods in the present disclosure are depicted in a particular order in the drawings, this does not require or imply that the steps must be performed in that particular order or that all illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware.
It should be appreciated that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (13)

1. An energy conversion device, comprising:
the motor module comprises a motor inverter, a motor winding, a first switch, a first bridge arm, a bus capacitor and a direct current charging port, wherein the positive electrode bus end of the motor inverter is connected with the positive electrode of a battery, the negative electrode bus end of the motor inverter is connected with the negative electrode of the battery, the first end of the motor winding is connected with the alternating current output end of the motor inverter, the second end of the motor winding is connected with the first end of the first switch, the second end of the first switch is connected with the midpoint of the first bridge arm, the first end of the bus capacitor, the first end of the first bridge arm and the positive electrode of the direct current charging port are connected together, and the second end of the bus capacitor, the second end of the first bridge arm, the negative electrode of the direct current charging port and the negative electrode bus end of the inverter are connected together;
And the controller is used for controlling the motor module according to an operation instruction of an operation mode to enable the energy conversion device to operate in a corresponding operation mode, wherein the operation mode comprises a motor driving mode for enabling the motor to output torque, a battery charging mode for enabling the charging equipment to charge the battery and a battery self-heating mode for enabling the battery to be charged and discharged repeatedly.
2. The energy conversion device of claim 1, wherein the inverter comprises at least one phase leg, the leg comprising an upper leg and a lower leg;
when the energy conversion device operates in the motor driving mode, the controller controls the first switch to be turned off so that the battery, the motor inverter and the motor winding form a motor driving circuit;
when the energy conversion device operates in the battery charging mode, the controller controls the first switch to be conducted so that the charging equipment, the direct-current charging port, the first bridge arm, the first switch, the motor winding, the motor inverter and the battery form a battery charging circuit for charging the battery by the charging equipment;
When the energy conversion device runs in the battery self-heating mode, the controller controls the first switch to be conducted so as to enable the bus capacitor, the first bridge arm, the first switch and the motor winding, the motor inverter and the battery form a battery heating circuit for heating the battery, and the battery and the bus capacitor are charged and discharged through controlling the motor inverter and the first bridge arm so as to achieve self-heating of the battery.
3. The energy conversion device of claim 2, wherein the battery self-heating mode comprises:
the controller controls the first switch and the upper bridge arm of the motor inverter to be conducted and controls the lower bridge arm of the first bridge arm to be turned off so that the battery, the upper bridge arm of the motor inverter, the motor winding, the first switch, the upper bridge arm of the first bridge arm and the bus capacitor form a first battery heating loop for discharging the battery and charging the bus capacitor;
and in the stage of charging the battery and discharging the bus capacitor, the controller controls the first switch and the upper bridge arm of the first bridge arm to be conducted and controls the lower bridge arm of the motor inverter to be turned off, so that the bus capacitor, the upper bridge arm of the first bridge arm, the first switch, the motor winding, the upper bridge arm of the motor inverter and the battery form a second battery heating loop for charging the battery and discharging the bus capacitor.
4. The energy conversion device of claim 2, wherein the battery self-heating mode further comprises:
and in the battery discharging and motor winding charging stage, the controller controls the first switch, the upper bridge arm of the inverter and the lower bridge arm of the first bridge arm to be conducted so that the battery, the upper bridge arm of the inverter, the motor winding, the first switch and the lower bridge arm of the first bridge arm form a third battery heating loop for discharging the battery and charging the motor winding.
5. The energy conversion device of claim 2, wherein the battery self-heating mode further comprises:
and in the motor winding discharging and bus capacitor charging stage, the controller controls the first switch to be conducted and controls the lower bridge arm of the first bridge arm to be turned off, so that the motor winding, the first switch, the upper bridge arm of the first bridge arm, the bus capacitor and the lower bridge arm of the motor inverter form a fourth battery heating loop for discharging the motor winding and charging the bus capacitor.
6. The energy conversion device of claim 2, wherein the battery self-heating mode further comprises:
And in the charging stage of the bus capacitor, the controller controls the first switch, the upper bridge arm of the first bridge arm and the lower bridge arm of the motor inverter to be conducted so that the bus capacitor, the upper bridge arm of the first bridge arm, the first switch, the motor winding and the lower bridge arm of the motor inverter form a fifth battery heating loop for discharging the bus capacitor and charging the motor winding.
7. The energy conversion device of claim 2, wherein the battery charging mode comprises:
and in the charging stage of the battery, the controller controls the first switch and the upper bridge arm of the first bridge arm to be conducted and controls the lower bridge arm of the motor inverter to be turned off, so that the direct-current charging port, the upper bridge arm of the first bridge arm, the first switch, the motor winding, the upper bridge arm of the motor inverter and the battery form a first battery charging loop for discharging the charging device and charging the battery.
8. The energy conversion device of claim 2, wherein the battery charging mode further comprises:
And in the charging stage of the charging equipment, the controller controls the first switch, the upper bridge arm of the first bridge arm and the lower bridge arm of the motor inverter to be conducted so that the direct current charging port, the upper bridge arm of the first bridge arm, the first switch, the motor winding and the lower bridge arm of the motor inverter form a second battery charging loop for discharging the charging equipment and charging the motor winding.
9. The energy conversion device according to claim 2, wherein a second switch is connected in series between a first end of a first capacitor and an anode of the dc charging port and/or between a second end of the first capacitor and a cathode of the dc charging port;
and when the energy conversion device operates in the battery charging mode, the controller controls the second switch to be turned on.
10. The energy conversion device according to any one of claims 1 to 9, further comprising:
the temperature detection module is used for detecting the temperature value of the battery;
The charging detection module is used for detecting whether the direct-current charging port is connected with the charging equipment or not;
the controller is further configured to determine whether the temperature value is lower than a preset temperature threshold, and generate an operation instruction of a battery self-heating mode when the temperature value is lower than the temperature threshold until the temperature value reaches the temperature threshold, and generate an operation instruction of a battery charging mode when the temperature value is greater than or equal to the temperature threshold and the direct current charging port is connected with the charging device, and generate an operation instruction of the motor driving mode when the temperature value is greater than or equal to the temperature threshold and the direct current charging port is not connected with the charging device.
11. A method of operating an energy conversion device according to any one of claims 1 to 10, characterized in that the method of operating comprises:
receiving an operation instruction of a working mode;
and controlling a motor module in the energy conversion device according to the operation instruction of the operation mode to enable the energy conversion device to operate in a corresponding operation mode, wherein the operation mode comprises a motor driving mode for enabling the motor to output torque, a battery charging mode for enabling the charging equipment to charge the battery or a battery self-heating mode for enabling the battery to be charged and discharged repeatedly.
12. The method of operating an energy conversion device according to claim 11, further comprising:
s100: detecting a temperature value of the battery;
s200: judging whether the temperature value is lower than a preset temperature threshold value or not;
s300: if the temperature value is lower than the temperature threshold, generating an operation instruction of a battery self-heating mode, controlling the motor module according to the operation instruction of the self-heating mode to enable the energy conversion device to operate the battery self-heating mode, and if the temperature value is greater than or equal to the temperature threshold, executing step S500;
s400: repeating steps S100-S300 until the temperature value reaches the temperature threshold;
s500: detecting whether a direct current charging port in the energy conversion device is connected with charging equipment or not;
s600: if the direct current charging port is connected with the charging equipment, generating an operation instruction of a battery charging mode, controlling the motor module according to the operation instruction of the battery charging mode so as to enable the energy conversion device to operate the battery charging mode, and if the direct current charging port is not connected with the charging equipment, executing step S700;
s700: generating an operation instruction of a motor driving mode, and controlling the motor module according to the operation instruction of the motor driving mode so as to enable the energy conversion device to operate the motor driving mode.
13. An electric vehicle, characterized by an energy conversion device according to any one of claims 1-10.
CN202010842456.8A 2020-08-20 2020-08-20 Energy conversion device, operation method thereof and electric automobile Active CN114074561B (en)

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