CN110936849A - High-voltage power supply system and method of hybrid power system and vehicle - Google Patents
High-voltage power supply system and method of hybrid power system and vehicle Download PDFInfo
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- CN110936849A CN110936849A CN202010110956.2A CN202010110956A CN110936849A CN 110936849 A CN110936849 A CN 110936849A CN 202010110956 A CN202010110956 A CN 202010110956A CN 110936849 A CN110936849 A CN 110936849A
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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
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a high-voltage power-up system, a high-voltage power-up method and a high-voltage power-up vehicle of a hybrid power system, wherein the system comprises a battery device, a main positive contactor, a main negative contactor, a motor device and an engine; the battery device comprises a power battery, wherein the power battery is used for providing high voltage electricity; the main positive contactor is connected with the positive pole of the power battery; the main negative contactor is connected with the negative electrode of the power battery; the motor device comprises a motor controller and a driving motor, the motor controller is connected between the main positive contactor and the main negative contactor, and the electric appliance controller is used for controlling the driving motor to work and controlling the voltage rising speed in the circuit; the engine and the driving motor are connected through the hybrid gearbox and are used for driving the driving motor to rotate.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a high-voltage power-on system and method of a hybrid power system and a vehicle.
Background
The hybrid vehicle has a high-pressure rising process when the vehicle is started. Currently, when the whole vehicle is under high pressure, a pre-charging circuit is designed, as shown in fig. 1 below. The high-voltage battery pack is used for attracting the pre-charging contactor before attracting the main positive contactor. After the pre-charging loop is closed, a pre-charging resistor in the pre-charging loop and a capacitor of a high-voltage loop (mainly a capacitor in a motor controller) form a charging and discharging loop, so that the high voltage can rise slowly. When the loop voltage reaches a certain threshold value, the high-voltage battery pack attracts the main positive contactor again, and then the pre-charging contactor is disconnected, so that the whole high-voltage process is completed. Through the design of the pre-charging loop, the high voltage is slowly increased, and the damage of high-voltage parts caused by sudden increase of the voltage of the high-voltage loop can be avoided.
However, the pre-charging circuit in the prior art is an additional circuit design, which increases the design cost of the vehicle and the cost of parts to some extent, so a new technical solution is needed to solve the current problems.
Disclosure of Invention
In view of the foregoing problems in the prior art, an object of the present invention is to provide a high-voltage charging system for a hybrid power system, a method thereof, and a vehicle, which can effectively save the pre-charging design cost of a high-voltage circuit and increase the operation opportunities of an engine.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
in one aspect, the invention provides a high-voltage power-on system of a hybrid power system, which comprises a battery device, a main positive contactor, a main negative contactor, a motor device and an engine;
the battery device comprises a power battery, wherein the power battery is used for providing high voltage electricity;
the main positive contact is connected with the positive electrode of the power battery;
the main negative contactor is connected with the negative electrode of the power battery;
the motor device comprises a motor controller and a driving motor, the motor controller is connected between the main positive contactor and the main negative contactor, and the motor controller is used for controlling the driving motor to work and controlling the voltage rising speed in a circuit;
the engine is connected with the driving motor through a hybrid gearbox and is used for driving the driving motor to rotate.
Further, the battery device further comprises a battery main control unit, and the battery main control unit is used for controlling the opening and closing of the main positive contactor and the main negative contactor.
Further, the battery main control unit is also used for detecting the voltage value in the circuit in real time.
Further, the engine and the drive motor are mechanically connected by a clutch in a hybrid transmission.
Further, the system also comprises an engine starter which is connected with the engine and used for starting the engine.
Specifically, the engine starter is a starter motor, and the starter motor is in transmission connection with the engine through a belt pulley.
Specifically, the starter motor is a 12V low voltage starter motor in a conventional vehicle, wherein the starter motor starts the engine using a vehicle 12V low voltage battery power source.
In a second aspect, the present invention further provides a high voltage power-on method for a hybrid power system, including the following steps:
the battery main control unit controls the closing of the main negative contactor;
starting an engine starter, and driving the engine to rotate to finish oil injection starting of the engine;
the transmission is in a neutral position, and meanwhile, the clutch is controlled to be combined, so that the engine drives the driving motor to rotate, and the driving motor generates high-voltage electromotive force by cutting an internal electromagnetic field;
according to the high-voltage electromotive force generated by the rotation of the driving motor, the motor controller controls the voltage to rise through the inverter circuit;
the battery main control unit detects a voltage value in a circuit in real time and judges whether the voltage value reaches a preset threshold value, and if so, the main positive contactor is controlled to be closed;
when the main positive contactor is closed, the motor controller controls the driving motor to stop working, the engine stops working at the same time, the hybrid gearbox controls the clutch to be disengaged, and the high-voltage electrifying work is completed.
Further, the motor controller controlling the voltage rise through the inverter circuit includes:
and the motor controller controls the voltage to rise according to a preset voltage rising slope.
Further, when the main positive contactor is closed, the motor controller controls the driving motor to stop working, the engine stops working, the hybrid transmission case controls the clutch to be disengaged, and the high-voltage electrifying work is completed, the method further comprises the following steps:
and responding to the operation of the user, and engaging to control the running of the vehicle.
In a third aspect, the invention further provides a vehicle, where the vehicle is a hybrid vehicle, and the vehicle is provided with the hybrid system high-voltage upper electric system.
By adopting the technical scheme, the high-voltage power supply system, the method and the vehicle of the hybrid power system have the following beneficial effects that:
1. compared with the conventional hybrid power system, the high-voltage power system, the method and the vehicle of the hybrid power system can save the pre-charging design of a high-voltage loop, eliminate a pre-charging contactor and a pre-charging resistor and reduce the cost of the whole vehicle.
2. The invention discloses a high-voltage power-up system, a high-voltage power-up method and a high-voltage power-up vehicle of a hybrid power system, and solves the problem that an engine is not used for a long time and is possibly damaged in the hybrid power system.
3. The high-voltage power supply system, the high-voltage power supply method and the vehicle of the hybrid power system are improved on the basis of the existing structure technology, so that the cost is saved, and the performance of the whole vehicle is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a high voltage power-up principle in the prior art;
FIG. 2 is a block diagram of a high voltage upper electrical system of a hybrid powertrain provided herein;
FIG. 3 is a schematic structural view of the battery device of FIG. 2;
fig. 4 is a step diagram of a high-voltage power-on method of a hybrid power system provided in the present specification.
In the figure: 1-battery device, 2-main positive contactor, 3-main negative contactor, 4-motor device, 5-engine, 6-hybrid gearbox, 7-engine starter, 11-power battery, 12-battery main control unit, 41-motor controller, 42-driving motor, 61-clutch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
In the prior art, the high-voltage power-on of the hybrid power system is performed by designing the pre-charging circuit, but this way may increase the cost of design to some extent, so an embodiment of the present specification provides a high-voltage power-on system of a hybrid power system, which can reduce the cost of adding the pre-charging circuit on the high-voltage circuit, and simultaneously can ensure normal high voltage, and the problem of damage to components due to sudden rise of high voltage during the high voltage process is not generated.
Specifically, as shown in fig. 2, the structural diagram of the high-pressure system of the hybrid power system is shown; the system comprises a battery device 1, a main positive contactor 2, a main negative contactor 3, a motor device 4 and an engine 5; wherein the battery device 1, the main positive contactor 2, the motor device 4 and the main negative contactor 3 form a series circuit.
As shown in fig. 3, the battery device 1 includes a power battery 11, and the power battery 1 is used for providing high voltage electricity;
the main positive contactor 2 is connected with the positive electrode of the power battery 11;
the main negative contactor 3 is connected with the negative electrode of the power battery 11;
the motor device 4 comprises a motor controller 41 and a driving motor 42, the motor controller 41 is connected between the main positive contactor 2 and the main negative contactor 3, and the motor controller 41 is used for controlling the operation of the driving motor 42 and the speed of voltage rise in a control circuit;
the engine 5 is connected with the driving motor 42 through a hybrid gearbox 6, and is used for driving the driving motor 42 to rotate.
Further, the closing and opening of the main positive contactor 2 and the main negative contactor 3 are controlled by the battery main control unit 12 in the battery device 1, and of course, the battery main control unit 12 is also used for detecting the voltage value in the circuit in real time, wherein the control logic of the battery main control unit 12 is performed by a preset control algorithm, or may be performed by a vehicle controller, in other words, the battery main control unit 12 controls the closing and opening of the main positive contactor 2 and the main negative contactor 3 through the vehicle controller and the voltage value in the circuit, so as to output the energy in the power battery 11.
In order to meet the requirement of high voltage power-up, the embodiment of the present specification does not provide an additional pre-charging circuit, so the driving motor 42 is driven by the rotation of the engine 5, at this time, the rotation of the driving motor 42 is equivalent to reverse rotation, the driving motor 42 will generate high voltage electromotive force by cutting an internal electromagnetic field, so as to form a voltage, and the motor controller 41 will control the voltage value in the circuit by controlling the rising speed of the voltage in the circuit.
It should be noted that the starting of the engine 5 requires control of an engine starter 7, specifically, control of a 12V starter motor, and it should be noted that the 12V starter motor may be a 12V low-voltage starter motor in a conventional vehicle, the 12V starter motor may be in transmission connection with the engine through a pulley, when starting of the engine 5 is required, the 12V starter motor is controlled to operate, after the engine 5 is started, the 12V starter motor is controlled to stop operating, and the stopping of the engine 5 may be controlled by a vehicle controller.
In addition, the engine 5 and the driving motor 42 may be mechanically connected by the clutch 61, and specifically, when the hybrid transmission 6 is in neutral, the engine 5 can control the driving motor 42 to rotate by the clutch 61.
Another embodiment of the present specification further provides a high-voltage power-on method for a hybrid power system, where the method is a control method for the above system, and specifically, as shown in fig. 4, the method includes the following steps:
s1: the battery main control unit controls the closing of the main negative contactor;
before a vehicle is started, a main positive contactor and a main negative contactor in current are both in an off state, when pre-charging high voltage is needed, a vehicle controller sends a control instruction to a battery main control unit, specifically, the vehicle controller sends the control instruction to a vehicle CAN bus, and the battery main control unit in a battery device controls the main negative contactor to be closed after receiving the control instruction.
S2: starting an engine starter, and driving the engine to rotate to finish oil injection starting of the engine;
after the main and negative contactors are closed, the vehicle controller can continue to control the 12V starting motor to start, so as to drive the engine to rotate, so that the engine finishes oil injection starting, and after the engine is started, the vehicle controller controls the 12V starting motor to stop working.
S3: the transmission is in a neutral position, and meanwhile, the clutch is controlled to be combined, so that the engine drives the driving motor to rotate, and the driving motor generates high-voltage electromotive force by cutting an internal electromagnetic field;
when the starting motor is started, the hybrid gearbox is also required to be in neutral, so that the driving motor mechanically connected with the engine can rotate along with the rotation of the engine, and the driving motor is in a counter-rotating state and can cut an internal electromagnetic field in the rotating process to generate high-voltage electromotive force, so that high voltage is generated.
S4: according to the voltage generated by the rotation of the driving motor, the motor controller controls the voltage to rise through the inverter circuit;
the voltage rise in the circuit can be controlled by a motor controller, namely, the speed or the slope of the voltage rise generated by the driving motor is controllable, and different rising speeds or slopes are designed according to the structures of different vehicles.
S5: the battery main control unit detects a voltage value in a circuit in real time and judges whether the voltage value reaches a preset threshold value, and if so, the main positive contactor is controlled to be closed;
specifically, the preset threshold may be 220V, and when the battery main control unit detects that the voltage value in the circuit reaches 220V, the main positive contactor is controlled to be closed, in other words, when the high voltage of the high-voltage bus reaches 220V, the requirement of pre-charging is met, and at this time, the power battery may output high voltage, and of course, the preset threshold may also be designed to be matched according to the voltage levels of different battery packs, and is generally controlled within a 10V differential pressure range. For example, if the battery is rated at 400V, the predetermined threshold is 390V, so that the damage to the parts and circuits is small.
S6: when the main positive contactor is closed, the motor controller controls the driving motor to stop working, the engine stops working at the same time, the hybrid gearbox controls the clutch to be disengaged, and the high-voltage electrifying work is completed.
When the main positive contactor is closed, the high-voltage electrification is finished, the engine needs to be controlled to stop working at the moment, then the motor controller needs to quit the voltage control mode, the driving motor is controlled to work according to an instruction, and the hybrid transmission gear needs to be adjusted to control the vehicle to start when the vehicle generally needs to start to run at the moment.
The above steps represent the whole process of the whole pre-charging high-voltage power-up.
On the other hand, an embodiment of the present specification further provides a vehicle, specifically, the vehicle is a hybrid vehicle, and the vehicle is further provided with the hybrid system high-voltage power-on system provided above, and the system operates through the control method provided above.
The hybrid power system control system, the hybrid power system control method and the vehicle have the following beneficial effects that:
1) compared with the conventional hybrid power system, the high-voltage power system, the method and the vehicle of the hybrid power system can save the pre-charging design of a high-voltage loop, eliminate a pre-charging contactor and a pre-charging resistor and reduce the cost of the whole vehicle.
2) The invention discloses a high-voltage power-up system, a high-voltage power-up method and a high-voltage power-up vehicle of a hybrid power system, and solves the problem that an engine is not used for a long time and is possibly damaged in the hybrid power system.
3) The high-voltage power supply system, the high-voltage power supply method and the vehicle of the hybrid power system are improved on the basis of the existing structure technology, so that the cost is saved, and the performance of the whole vehicle is improved.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A high-voltage upper power supply system of a hybrid power system is characterized by comprising a battery device (1), a main positive contactor (2), a main negative contactor (3), a motor device (4) and an engine (5);
the battery device (1) comprises a power battery (11), and the power battery (1) is used for providing high voltage electricity;
the main positive contactor (2) is connected with the positive electrode of the power battery (11);
the main negative contactor (3) is connected with the negative electrode of the power battery (11);
the motor device (4) comprises a motor controller (41) and a driving motor (42), the motor controller (41) is connected between the main positive contactor (2) and the main negative contactor (3), and the motor controller (41) is used for controlling the driving motor (42) to work and controlling the voltage rising speed in a circuit;
the engine (5) is connected with the driving motor (42) through a hybrid gearbox (6) and is used for driving the driving motor (42) to rotate.
2. A hybrid power system high voltage upper electrical system according to claim 1, characterized in that the battery device (1) further comprises a battery master control unit (12), the battery master control unit (12) being configured to control the opening and closing of the main positive contactor (2) and the main negative contactor (3).
3. A hybrid power system high voltage upper electrical system according to claim 2, wherein the battery master control unit (12) is further configured to detect a voltage value in the circuit in real time.
4. A hybrid powertrain high voltage electrical upper system according to claim 1, characterized in that the engine (5) and the drive motor (42) are mechanically connected by a clutch (61) in a hybrid gearbox (6).
5. A hybrid powertrain system high voltage upper electrical system according to claim 1, further comprising an engine starter (7), said engine starter (7) being connected to said engine (5) for starting said engine (5).
6. A hybrid powertrain system high voltage upper electrical system according to claim 5, characterized in that the engine starter motor (7) is a starter motor, which is in pulley transmission connection with the engine (5).
7. A high-voltage power-on method for a hybrid power system is characterized by comprising the following steps:
the battery main control unit controls the closing of the main negative contactor;
starting an engine starter, and driving the engine to rotate to finish oil injection starting of the engine;
the hybrid transmission is put into a neutral position, and meanwhile, the clutch is controlled to be combined, so that the engine drives the driving motor to rotate, and the driving motor generates high-voltage electromotive force by cutting an internal electromagnetic field;
according to the high-voltage electromotive force generated by the rotation of the driving motor, the motor controller controls the voltage to rise through the inverter circuit;
the battery main control unit detects a voltage value in a circuit in real time and judges whether the voltage value reaches a preset threshold value, and if so, the main positive contactor is controlled to be closed;
when the main positive contactor is closed, the motor controller controls the driving motor to stop working, the engine is stopped at the same time, the hybrid gearbox controls the clutch to be disengaged, and the high-voltage electrifying work is finished.
8. The hybrid power system high voltage power-on method as claimed in claim 7, wherein the step of controlling the voltage rise by the motor controller through the inverter circuit comprises:
and the motor controller controls the voltage to rise according to a preset voltage rising slope.
9. The method for powering up a hybrid power system according to claim 7, wherein when the main positive contactor is closed, the motor controller controls the driving motor to stop working, the engine is stopped, the hybrid transmission control clutch is disengaged, and after the high-voltage power-up working is completed, the method further comprises:
and controlling the vehicle to run by engaging with the gear according to the operation of the user.
10. A vehicle, which is a hybrid vehicle, characterized in that the vehicle is provided with a hybrid system high-voltage upper electrical system according to any one of claims 1 to 6.
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| CN111638448A (en) * | 2020-05-15 | 2020-09-08 | 中国第一汽车股份有限公司 | Contactor fault detection device and method and vehicle |
| CN113183761A (en) * | 2021-05-21 | 2021-07-30 | 东风汽车集团股份有限公司 | High-voltage pre-charging loop, high-voltage pre-charging method and high-voltage pre-charging system of electric automobile |
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