Discharging system and method of vehicle power battery

Abstract

The present invention discloses a discharge system and method for a vehicle power battery, wherein the system comprises: a transfer harness, the transfer harness is used to disconnect the connection line between the power drive unit of the vehicle and the power supply end of the charging contactor, and lead the power supply end of the charging contactor to the outside of the vehicle; a discharge device, the discharge device comprises: an electronic load, the electronic load is connected to the charging interface of the vehicle, and the electronic load is used to discharge the power battery; a discharge host computer, the discharge host computer is connected to the electronic load and the vehicle respectively, and the discharge host computer is used to obtain the state information of the power battery when the power supply end of the charging contactor is connected to the positive pole of the power supply or the negative pole of the power supply so that the charging contactor is in a closed state, and control the electronic load to discharge the power battery according to the state information. Thus, the efficient discharge of the electric vehicle in a stationary state can be achieved, the discharge time is greatly shortened, and the requirements for the experimental site and personnel are low, and the safety is high.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a discharge system and method for a vehicle power battery. Background Art

[0002] During the research and development of electric vehicles, the battery needs to be charged and discharged frequently. Fast and efficient discharge can effectively shorten the experimental time, thereby shortening the cycle to a certain extent.

[0003] In the related technologies, air-conditioning discharge and driving discharge are mostly used in the research and development process, but these two methods have certain disadvantages: air-conditioning discharge takes a long time and depends on the ambient temperature. When the ambient temperature is not suitable, the operation of the air conditioner will be restricted, which will seriously affect the discharge efficiency; driving discharge not only requires a special driver, but also requires a specific experimental site, which is dangerous and has low discharge efficiency. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first purpose of the present invention is to provide a discharge system for a vehicle power battery, which can achieve efficient discharge of an electric vehicle in a stationary state, greatly shorten the discharge time, and has low requirements for experimental sites and personnel, and high safety.

[0005] A second object of the present invention is to provide a method for discharging a vehicle power battery.

[0006] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a discharge system for a vehicle power battery, the system comprising: an adapter harness, the adapter harness is used to disconnect the connecting line between the power drive unit of the vehicle and the power supply end of the charging contactor, and lead the power supply end of the charging contactor to the outside of the vehicle; a discharge device, the discharge device comprising: an electronic load, the electronic load is connected to the charging interface of the vehicle, and the electronic load is used to discharge the power battery; a discharge host computer, the discharge host computer is connected to the electronic load and the vehicle respectively, and the discharge host computer is used to obtain the status information of the power battery when the power supply end of the charging contactor is connected to the positive pole or the negative pole of the power supply so that the charging contactor is in a closed state, and control the electronic load to discharge the power battery according to the status information.

[0007] According to the discharge system of the vehicle power battery of the embodiment of the present invention, the connection line between the power drive unit of the vehicle and the power supply end of the charging contactor is disconnected through the adapter harness, and the power supply end of the charging contactor is led out to the outside of the vehicle, and connected to the charging interface of the vehicle through the electronic load in the discharge device, the electronic load is used to discharge the power battery, and the discharge host computer in the discharge device is connected to the electronic load and the vehicle respectively, when the power supply end of the charging contactor is connected to the positive pole of the power supply or the negative pole of the power supply to make the charging contactor in a closed state, the state information of the power battery is obtained, and the electronic load is controlled to discharge the power battery according to the state information. In this way, the efficient discharge of the electric vehicle in a stationary state can be achieved, the discharge time is greatly shortened, and the requirements for the experimental site and personnel are low, and the safety is high.

[0008] According to one embodiment of the present invention, when the closing mode of the charging contactor is a low-voltage mode, the power supply end of the charging contactor is connected to the positive pole of the power supply; when the closing mode of the charging contactor is a high-voltage mode, the power supply end of the charging contactor is connected to the negative pole of the power supply.

[0009] According to one embodiment of the present invention, the discharge host computer is also used to: receive a discharge mode set by a user, and control the electronic load to discharge the power battery according to the status information and the discharge mode, and the discharge mode includes at least one of a constant current discharge mode, a constant power discharge mode and a constant resistance discharge mode.

[0010] According to one embodiment of the present invention, when the discharge mode is a constant current discharge mode, the status information includes the discharge current, and the discharge host computer is specifically used to: when the discharge current is greater than the current setting value, increase the resistance of the electronic load; when the discharge current is less than the current setting value, reduce the resistance of the electronic load; when the discharge current is equal to the current setting value, keep the resistance of the electronic load unchanged.

[0011] According to one embodiment of the present invention, when the discharge mode is a constant power discharge mode, the status information includes the discharge power, and the discharge host computer is specifically used to: when the discharge power is greater than the power setting value, increase the resistance of the electronic load; when the discharge power is less than the power setting value, reduce the resistance of the electronic load; when the discharge power is equal to the power setting value, keep the resistance of the electronic load unchanged.

[0012] According to an embodiment of the present invention, when the discharge mode is a constant resistance discharge mode, the discharge host computer is specifically used to: keep the resistance value of the electronic load unchanged at the set resistance value.

[0013] According to one embodiment of the present invention, the discharge host computer is further used to: receive a discharge stop condition set by a user, and control the electronic load to stop discharging the power battery when the status information meets the discharge stop condition.

[0014] According to one embodiment of the present invention, the charging contactor is a fast charging relay, and the charging interface is a fast charging interface.

[0015] To achieve the above-mentioned purpose, a second aspect of the present invention proposes a method for discharging a vehicle power battery. The method can be applied to the discharge system of the vehicle power battery of any of the above-mentioned embodiments, including: controlling the whole vehicle to power off and disconnecting the connection between the vehicle's battery and the vehicle; connecting the vehicle's power drive unit and the power supply end of the charging contactor through a wiring harness; connecting the power supply end of the charging contactor to the positive pole or the negative pole of the power supply to put the charging contactor in a closed state; restoring the connection between the battery and the vehicle, and powering on the whole vehicle; connecting the electronic load of the discharge device to the charging port of the vehicle, establishing a connection between the discharge device and the vehicle, and starting the discharge device to discharge the vehicle's power battery after the connection is successful.

[0016] According to the discharge method of the vehicle power battery of the embodiment of the present invention, the whole vehicle is powered off by controlling the whole vehicle, and the connection between the battery of the vehicle and the vehicle is disconnected, and the power supply end of the power drive unit of the vehicle and the charging contactor are connected through the adapter harness, and the charging contactor is closed by connecting the power supply end of the charging contactor to the positive pole or the negative pole of the power supply, and the whole vehicle is powered on by restoring the connection between the battery and the vehicle, and the electronic load of the discharge device is connected to the charging interface of the vehicle, and the connection between the discharge device and the vehicle is established, and the discharge device is started to discharge the power battery of the vehicle after the connection is successful. In this way, the electric vehicle can be discharged efficiently in a stationary state, which greatly shortens the discharge time, and has low requirements for experimental sites and personnel, and high safety.

[0017] According to one embodiment of the present invention, after the power battery is discharged, the discharge method further includes: turning off the discharge device and disconnecting the battery from the vehicle; unplugging the adapter harness and restoring the connection between the power drive unit and the power supply end of the charging contactor; and restoring the connection between the battery and the vehicle.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural block diagram of a discharge system of a vehicle power battery according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a connection structure of a patch cord according to an embodiment of the present invention;

[0021] Figure 3 is a flow chart of a method for discharging a vehicle power battery according to an embodiment of the present invention;

[0022] Figure 4 is a flow chart of a method for discharging a vehicle power battery according to another embodiment of the present invention;

[0023] Figure 5 is a flow chart of a method for discharging a vehicle power battery according to yet another embodiment of the present invention;

[0024] Figure 6 The present invention is a flow chart of a method for discharging a vehicle power battery according to another embodiment of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] It should be noted that the PEU (Power Electronic Unit) of existing electric vehicles is electrically connected to components on the vehicle (such as electronic control units, switches, etc.) through the actual vehicle wiring harness to achieve corresponding control functions. In order to achieve efficient discharge of electric vehicles in a stationary state, it is possible to consider adding a calibration interface to the PEU for connecting the discharge device, but this requires determining more parameters, and will limit multiple functions, and may also lead to unexpected situations. Therefore, the present application provides a discharge system for a vehicle power battery, which can conveniently achieve efficient discharge of electric vehicles in a stationary state, greatly shorten the discharge time, and compared with driving discharge, it has low requirements for experimental sites and personnel, and high safety.

[0027] The following describes a discharge system and method for a vehicle power battery provided by an embodiment of the present invention with reference to the accompanying drawings.

[0028] Figure 1 FIG. 1 is a structural block diagram of a discharge system of a vehicle power battery according to an embodiment of the present invention, referring to FIG. Figure 1As shown, the discharge system 1000 of the vehicle power battery may include a transfer harness 110 and a discharge device 120, and the vehicle 2000 may include a charging contactor 210 and a power battery 220. Among them, the transfer harness 110 is used to disconnect the connection line between the PEU of the vehicle and the power supply end of the charging contactor 210 (which may be a fast charging relay), and lead the power supply end of the charging contactor 210 to the outside of the vehicle. The discharge device 120 includes an electronic load 121 and a discharge host computer 122, wherein the electronic load 121 is connected to the charging interface of the vehicle, and the electronic load 121 is used to discharge the power battery 220; the discharge host computer 122 is connected to the electronic load 121 and the vehicle respectively, and the discharge host computer 122 is used to obtain the status information of the power battery 220 when the power supply end of the charging contactor 210 is connected to the positive pole or the negative pole of the power supply so that the charging contactor is in a closed state, and control the electronic load 121 to discharge the power battery 220 according to the status information.

[0029] Specifically, among the several control lines of the PEU, the adapter harness 110 only processes the control line of the charging contactor 210 of the PEU, and the other control lines can remain unchanged. Figure 2 As shown, when the connection between the PEU of the vehicle and the wiring harness of the actual vehicle is disconnected, a disconnected connector A (male end) and a connector B (female end) can be formed, and the adapter harness 110 is provided with a connector B' (female end) corresponding to the connector A (male end), and a connector A' (male end) corresponding to the connector B (female end) according to the interface definition that can be connected in series with the discharge simulation system.

[0030] When the discharge system 1000 of the vehicle power battery is used, the whole vehicle 2000 is first controlled to be powered off, the battery connection is disconnected, and the connection between the PEU and the actual vehicle wiring harness is disconnected, and then the adapter harness 110 is connected in series, and the ground wire or power wire of the charging contactor 210 is led out to the outside of the vehicle to put the charging contactor 210 in a closed state. Then the discharge device 120 is connected to the charging interface of the vehicle through the electronic load 121, and the charging interface can be a fast charging interface, and the battery is restored. The discharge host computer 122 is connected to the electronic load 121 and the vehicle 2000 respectively, so as to obtain the status information of the power battery 220 when the power supply end of the charging contactor 210 is connected to the positive pole or the negative pole of the power supply so that the charging contactor 210 is in a closed state, wherein the connection between the discharge host computer 122 and the electronic load 121 and the vehicle can be CAN communication, and the acquired status information of the power battery 220 can include real-time information such as the remaining power of the power battery and the available capacity of the power battery, and then the electronic load 121 is controlled to discharge the power battery 220 according to the status information. After the discharge is completed, the discharge device 120 is turned off, the vehicle 2000 is powered off, the connection between the battery and the vehicle is disconnected, and then the adapter harness 110 is unplugged, and the connection between the PEU and the power supply end of the charging contactor 210 is restored.

[0031] Therefore, under the condition of real-time monitoring of the status information of the power battery, the charging contactor can be manually controlled to close through the adapter harness, and the high voltage of the power battery can be introduced into the discharge device to introduce the energy of the power battery into the electronic load for heat consumption, thereby realizing efficient discharge of the electric vehicle in a stationary state and greatly shortening the discharge time. Compared with air-conditioning discharge, this discharge system is more efficient; compared with driving discharge, this discharge system is not only efficient, but also has low requirements for experimental sites and personnel, and is highly safe.

[0032] In one embodiment, when the closing mode of the charging contactor is a low-voltage mode, the power supply end of the charging contactor is connected to the positive pole of the power supply; when the closing mode of the charging contactor is a high-voltage mode, the power supply end of the charging contactor is connected to the negative pole of the power supply.

[0033] That is to say, if the charging contactor is closed at low voltage, the power supply end of the charging contactor is connected to the positive pole of the power supply, that is, the positive wire is connected to the power supply through the adapter harness; if the charging contactor is closed at high voltage, the power supply end of the charging contactor is connected to the negative pole of the power supply, that is, the ground wire is connected to the ground through the adapter harness.

[0034] In one embodiment, the discharge host computer is further used to: receive a discharge stop condition set by a user, and control the electronic load to stop discharging the power battery when the status information meets the discharge stop condition.

[0035] Specifically, before starting to discharge, the user can set different discharge stop conditions according to needs. During the discharge process, when the status information obtained by the discharge host computer in real time meets the above preset discharge stop conditions, the discharge stops automatically, thereby realizing automatic discharge according to user-defined needs. Among them, the relevant parameters of the discharge stop condition may include discharge cut-off time, discharge cut-off current, discharge cut-off voltage, cut-off battery capacity and cut-off charge state, etc.

[0036] In one embodiment, the discharge host computer is also used to: receive a discharge mode set by a user, and control the electronic load to discharge the power battery according to the status information and the discharge mode, wherein the discharge mode includes at least one of a constant current discharge mode, a constant power discharge mode and a constant resistance discharge mode.

[0037] That is to say, different discharge modes can be set according to user needs, and then the electronic load can be controlled to discharge the power battery according to the status information of the power battery and the discharge mode set by the user. Specifically, the discharge mode here can include constant current discharge mode, constant power discharge mode and / or constant resistance discharge mode. Among them, the constant current discharge mode refers to setting the discharge current through the main control software, and monitoring the discharge current in real time, adjusting the resistance value of the electronic load according to the current (I=U / R), and realizing constant current discharge; the constant power discharge mode refers to setting the discharge power (P=U 2 / R), and monitor the discharge power in real time, adjust the electronic load resistance value according to the current, and realize constant power discharge; constant resistance discharge means setting the discharge resistance through the main control software, and controlling the electronic load resistance to maintain a fixed value to realize constant resistance discharge.

[0038] Optionally, when the discharge mode is a constant current discharge mode, the status information includes the discharge current, and the discharge host computer is specifically used to: when the discharge current is greater than the current setting value, increase the resistance of the electronic load; when the discharge current is less than the current setting value, reduce the resistance of the electronic load; when the discharge current is equal to the current setting value, keep the resistance of the electronic load unchanged.

[0039] Specifically, Figure 3 For the flow chart of constant current discharge mode, refer to Figure 3 As shown, the discharge method in the constant current discharge mode includes the following steps:

[0040] Step S201: connect the adapter harness, establish a discharge system, set the discharge cut-off condition, constant current discharge mode and discharge current, and then start the discharge.

[0041] Step S202: Continuous discharge, the host computer system monitors the discharge stop condition signal, discharge current and battery pack voltage in real time.

[0042] Step S203: determine whether the discharge current is the set value, if not, execute step S204; if yes, keep the current resistance value of the electronic load, and execute step S205.

[0043] Step S204: determine whether the discharge current is greater than the set value. If so, automatically increase the electronic load resistance and execute step S202 with the increased electronic load resistance; if not, automatically reduce the electronic load resistance and execute step S202 with the reduced electronic load resistance.

[0044] Step S205: determine whether the discharge stopping condition is met, if not, execute step S202; if met, the discharge is stopped.

[0045] Optionally, when the discharge mode is a constant power discharge mode, the status information includes the discharge power, and the discharge host computer is specifically used to: when the discharge power is greater than the power setting value, increase the resistance of the electronic load; when the discharge power is less than the power setting value, reduce the resistance of the electronic load; when the discharge power is equal to the power setting value, keep the resistance of the electronic load unchanged.

[0046] Specifically, Figure 4 For the flow chart of constant power discharge mode, refer to Figure 4 As shown, the discharge method in the constant power discharge mode includes the following steps:

[0047] Step S301: connect the adapter harness, establish a discharge system, set the discharge cut-off condition, constant power discharge mode and discharge power, and then start the discharge.

[0048] Step S302: Continuous discharge, the host computer system monitors the discharge stop condition signal, discharge power and battery pack voltage in real time.

[0049] Step S303: determine whether the discharge power is the set value, if not, execute step S304; if yes, keep the current resistance value of the electronic load, and execute step S305.

[0050] Step S304: determine whether the discharge power is greater than the set value. If so, automatically increase the electronic load resistance and execute step S302 with the increased electronic load resistance; if not, automatically reduce the electronic load resistance and execute step S302 with the reduced electronic load resistance.

[0051] Step S305: determine whether the discharge stopping condition is met, if not, execute step S302; if met, the discharge is stopped.

[0052] Optionally, when the discharge mode is a constant resistance discharge mode, the discharge host computer is specifically used to: keep the resistance value of the electronic load unchanged at the set resistance value.

[0053] Specifically, Figure 5 For the flow chart of constant resistance discharge mode, refer to Figure 5 As shown, the discharge method in the constant resistance discharge mode includes the following steps:

[0054] Step S401: connect the adapter harness, establish a discharge system, set the discharge cut-off condition, constant resistance discharge mode and resistance value, and then start the discharge.

[0055] Step S402: Continuous discharge, the host computer system monitors the discharge stop condition signal in real time.

[0056] Step S403: maintaining the current resistance value of the electronic load to continuously discharge.

[0057] Step S405: determine whether the discharge stopping condition is met, if not, execute step S402; if met, the discharge is stopped.

[0058] In summary, according to the discharge system of the vehicle power battery of the embodiment of the present invention, the connection line between the PEU of the vehicle and the power supply end of the charging contactor is disconnected through the adapter harness, and the power supply end of the charging contactor is led out to the outside of the vehicle, and connected to the charging interface of the vehicle through the electronic load in the discharge device, the electronic load is used to discharge the power battery, and the discharge host computer in the discharge device is connected to the electronic load and the vehicle respectively, when the power supply end of the charging contactor is connected to the positive pole of the power supply or the negative pole of the power supply to make the charging contactor in a closed state, the state information of the power battery is obtained, and the electronic load is controlled to discharge the power battery according to the state information. In this way, the efficient discharge of the electric vehicle in a stationary state can be achieved, the discharge time is greatly shortened, and the requirements for the experimental site and personnel are low, and the safety is high.

[0059] Figure 6 is a structural block diagram of a method for discharging a vehicle power battery according to an embodiment of the present invention, referring to Figure 6 As shown, the vehicle power battery discharge method can be applied to the vehicle power battery discharge system of any of the above embodiments, and includes the following steps:

[0060] Step S501: Control the whole vehicle to power off and disconnect the battery of the vehicle from the vehicle.

[0061] Step S502: Connect the PEU of the vehicle and the power supply end of the charging contactor through the adapter harness.

[0062] Step S503: The charging contactor is in a closed state by connecting the power supply end of the charging contactor to the positive electrode or the negative electrode of the power supply.

[0063] Step S504: restore the connection between the battery and the vehicle, and power on the entire vehicle.

[0064] Step S505: Connect the electronic load of the discharge device to the charging interface of the vehicle, establish a connection between the discharge device and the vehicle, and start the discharge device to discharge the power battery of the vehicle after the connection is successful.

[0065] In one embodiment, after the power battery is discharged, the method further includes: turning off the discharge device and disconnecting the battery from the vehicle; unplugging the adapter harness and restoring the connection between the PEU and the power supply end of the charging contactor; and restoring the connection between the battery and the vehicle.

[0066] It should be noted that for the description of the discharge method of the vehicle power battery in this application, please refer to the description of the discharge system of the vehicle power battery in this application, and the details will not be repeated here.

[0067] According to the discharge method of the vehicle power battery of the embodiment of the present invention, the whole vehicle is powered off by controlling the whole vehicle, and the connection between the battery of the vehicle and the vehicle is disconnected, and the PEU of the vehicle and the power supply end of the charging contactor are connected through the adapter harness, and the charging contactor is closed by connecting the power supply end of the charging contactor to the positive pole or the negative pole of the power supply, and the whole vehicle is powered on by restoring the connection between the battery and the vehicle, and the electronic load of the discharge device is connected to the charging interface of the vehicle, and the connection between the discharge device and the vehicle is established, and the discharge device is started to discharge the power battery of the vehicle after the connection is successful. In this way, the electric vehicle can be discharged efficiently in a stationary state, which greatly shortens the discharge time, and has low requirements for experimental sites and personnel, and high safety.

[0068] It should be understood that although Figure 3-6 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 3-6 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0069] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0070] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A discharge system for a vehicle power battery, characterized in that: The system comprises: A wiring harness for disconnecting a connection line between a power drive unit of the vehicle and a power supply end of a charging contactor, and leading the power supply end of the charging contactor to the outside of the vehicle; A discharge device, comprising: An electronic load, the electronic load being connected to a charging interface of the vehicle, and the electronic load being used to discharge the power battery; A discharge host computer, the discharge host computer is connected to the electronic load and the vehicle respectively, and is used to obtain the status information of the power battery when the power supply end of the charging contactor is connected to the positive pole of the power supply or the negative pole of the power supply so that the charging contactor is in a closed state, and control the electronic load to discharge the power battery according to the status information; The discharge host computer is also used to: receive a discharge mode set by a user, and control the electronic load to discharge the power battery according to the state information and the discharge mode, wherein the discharge mode includes at least one of a constant current discharge mode, a constant power discharge mode and a constant resistance discharge mode.

2. The discharge system of the vehicle power battery according to claim 1, characterized in that: When the closing mode of the charging contactor is a low-voltage mode, the power supply end of the charging contactor is connected to the positive electrode of the power supply; When the closing mode of the charging contactor is a high voltage mode, the power supply end of the charging contactor is connected to the negative electrode of the power supply.

3. The discharge system of the vehicle power battery according to claim 1, characterized in that: When the discharge mode is the constant current discharge mode, the state information includes the discharge current, and the discharge host computer is specifically used for: When the discharge current is greater than the current setting value, increasing the resistance of the electronic load; When the discharge current is less than the current setting value, reducing the resistance of the electronic load; When the discharge current is equal to the current setting value, the resistance value of the electronic load is kept unchanged.

4. The discharge system of the vehicle power battery according to claim 1, characterized in that: When the discharge mode is the constant power discharge mode, the state information includes the discharge power, and the discharge host computer is specifically used for: When the discharge power is greater than the power setting value, increasing the resistance value of the electronic load; When the discharge power is less than the power setting value, reducing the resistance of the electronic load; When the discharge power is equal to the power setting value, the resistance value of the electronic load is kept unchanged.

5. The discharge system of the vehicle power battery according to claim 1, characterized in that: When the discharge mode is the constant resistance discharge mode, the discharge host computer is specifically used for: The resistance value of the electronic load is kept constant at the set resistance value.

6. The discharge system of a vehicle power battery according to any one of claims 1 to 5, characterized in that: The discharge host computer is further used to: receive a discharge stop condition set by a user, and control the electronic load to stop discharging the power battery when the status information meets the discharge stop condition.

7. The discharge system of a vehicle power battery according to any one of claims 1 to 5, characterized in that: The charging contactor is a fast charging relay, and the charging interface is a fast charging interface.

8. A method for discharging a vehicle power battery, characterized in that: A discharge system for a vehicle power battery as claimed in any one of claims 1 to 7, wherein the method comprises: Controlling the whole vehicle to power off and disconnecting the battery of the vehicle from the vehicle; Connecting the power drive unit of the vehicle and the power supply end of the charging contactor through the adapter harness; The charging contactor is in a closed state by connecting the power supply end of the charging contactor to the positive pole or the negative pole of the power supply; Restoring the connection between the battery and the vehicle and powering on the vehicle; The electronic load of the discharge device is connected to the charging interface of the vehicle, and the connection between the discharge device and the vehicle is established, and after the connection is successful, the discharge device is started to discharge the power battery of the vehicle.

9. The method for discharging a vehicle power battery according to claim 8, characterized in that: After the power battery is discharged, the method further includes: Turning off the discharge device and disconnecting the battery from the vehicle; Unplug the adapter harness and restore the connection between the power drive unit and the power supply end of the charging contactor; Restore the battery connection to the vehicle.

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