Vehicle and leakage detection and positioning method thereof

Abstract

The present invention discloses a vehicle and a leakage detection and positioning method thereof. The vehicle includes a battery management controller, a vehicle control unit and at least one carriage, the carriage includes a power battery assembly, multiple load branches, and a leakage sensor connected to the negative electrode of the power battery assembly; the battery management controller sends a first request leakage detection instruction to the leakage sensor when the power battery assembly is charging, and sends a first leakage alarm signal to the vehicle control unit when the leakage sensor determines leakage, controls the power battery assembly to stop charging, controls the total positive contactor to disconnect when receiving the high-voltage power-off instruction sent by the vehicle control unit based on the signal, and sends a second request leakage detection instruction to the leakage sensor, and determines the leakage position according to whether the leakage sensor detects leakage within the first preset time. The vehicle can determine the leakage position.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle and a leakage detection and positioning method thereof. Background Art

[0002] When a vehicle is charging, if leakage occurs, it will not only impact the circuit of the vehicle, but may even cause safety accidents such as electric shock and fire. However, the leakage detection of the vehicle in the related art can only determine whether there is leakage in the vehicle, but cannot determine the location of the leakage. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, a first object of the present invention is to provide a vehicle to locate the leakage position when leakage occurs.

[0004] The second objective of the present invention is to provide a method for detecting and locating leakage of a vehicle.

[0005] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a vehicle, including a battery management controller, a vehicle control unit and M carriages, M is a positive integer, each carriage includes a power battery assembly, a leakage sensor and a plurality of load branches, the positive electrode of the power battery assembly is respectively connected to one end of the charging circuit and one end of each load branch through a total positive contactor, the negative electrode of the power battery assembly is respectively connected to the other end of the charging circuit and the other end of each load branch, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection; wherein, the battery management controller The controller is used to: send a first request leakage detection instruction to the leakage sensor when the power battery assembly is charging, and send the first leakage alarm signal to the vehicle control unit when receiving the first leakage alarm signal fed back by the leakage sensor, so as to control the power battery assembly to stop charging; receive the high-voltage power-off instruction sent by the vehicle control unit based on the first leakage alarm signal, control the main positive contactor to disconnect, and send a second request leakage detection instruction to the leakage sensor, and determine the leakage location according to whether the second leakage alarm signal fed back by the leakage sensor is received within a first preset time.

[0006] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a method for detecting and locating leakage of a vehicle, wherein the vehicle comprises a vehicle control unit and M carriages, where M is a positive integer, and each carriage comprises a power battery assembly, a leakage sensor and a plurality of load branches, wherein the positive electrode of the power battery assembly is respectively connected to one end of the charging circuit and one end of each of the load branches through a total positive contactor, the negative electrode of the power battery assembly is respectively connected to the other end of the charging circuit and the other end of each of the load branches, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection; wherein, The method includes: when the power battery assembly is charging, sending a first request leakage detection instruction to the leakage sensor, and when receiving a first leakage alarm signal fed back by the leakage sensor, sending the first leakage alarm signal to the vehicle control unit to control the unloading of the power battery assembly; when receiving a high-voltage power-off instruction sent by the vehicle control unit based on the first leakage alarm signal, controlling the main positive contactor to disconnect, and sending a second request leakage detection instruction to the leakage sensor, and determining the leakage location according to whether the second leakage alarm signal fed back by the leakage sensor is received within a first preset time.

[0007] The vehicle and leakage detection and positioning method thereof of the embodiments of the present invention can detect whether leakage exists when charging the power battery assembly, and stop charging the power battery assembly when leakage is detected, thereby controlling the disconnection of the main positive contactor, and performing leakage detection again after the disconnection of the main positive contactor, thereby determining the leakage location according to the leakage detection result.

[0008] 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

[0009] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

[0010] Figure 2 is a schematic structural diagram of a vehicle according to an example of the present invention;

[0011] Figure 3 is a schematic structural diagram of a power battery assembly according to an example of the present invention;

[0012] Figure 4 The present invention is a flowchart of a method for detecting and locating leakage in a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] 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.

[0014] The following describes a vehicle and a leakage detection and positioning method thereof according to an embodiment of the present invention with reference to the accompanying drawings.

[0015] Figure 1 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

[0016] like Figure 1 As shown, the vehicle 10 includes a battery management controller 200, a vehicle control unit 300 and M carriages 100, where M is a positive integer, and each carriage 100 includes a power battery assembly 101, a leakage sensor 103, a charging circuit and multiple load branches. The positive electrode of the power battery assembly 101 is connected to one end of the charging circuit and one end of each load branch through a total positive contactor KM7, and the negative electrode of the power battery assembly 101 is connected to the other end of the charging circuit and the other end of each load branch. The leakage sensor 103 is connected to the negative electrode of the power battery assembly 101 for leakage detection; wherein, the battery management controller 200 Used to: when the power battery assembly 101 is charging, send a first request leakage detection instruction to the leakage sensor 103, and when receiving the first leakage alarm signal fed back by the leakage sensor 103, send a first leakage alarm signal to the vehicle control unit 300 to control the power battery assembly 101 to stop charging; when receiving the high-voltage power-off instruction sent by the vehicle control unit 300 based on the first leakage alarm signal, control the total positive contactor KM7 to disconnect, and send a second request leakage detection instruction to the leakage sensor 103, and determine the leakage location according to whether the second leakage alarm signal fed back by the leakage sensor 103 is received within the first preset time. The above-mentioned vehicle 10 is charged by the charger 400.

[0017] The battery management controller 200 may correspond to the vehicle 10, or may correspond to the power battery assembly 101, or may correspond to the battery pack in the power battery assembly 101. Figure 1, which is a specific embodiment in which the battery management controller 200 corresponds to the vehicle 10 and M is greater than 1. The vehicle control unit 300 may be, for example, a CCU (Central Control Unit), and the battery management controller 200 may be, for example, a BMS (Battery Management System). The load 102 may include, for example, a motor controller, a DC-DC converter, an air conditioner, a wind source system, an air compressor, a PTC (Positive Temperature Coefficient) electric heating device, etc.

[0018] The load 102 can be started after receiving the high-voltage power-on command sent by the vehicle control unit 300, and then send a high-voltage power-on success signal to the vehicle control unit 300; and unload after receiving the high-voltage system leakage alarm sent by the vehicle control unit 300, and send unloading completion information to the vehicle control unit 300. The leakage sensor 103 starts leakage detection after receiving the leakage detection request command sent by the battery management controller 200, and stops leakage detection after receiving the leakage detection stop command sent by the battery management controller 200.

[0019] The communication between the vehicle control unit 300 , the battery management controller 200 , and the load 102 may be, for example, network communication; the communication between the battery management controller 200 , the leakage sensor 103 , and the charger 400 may be, for example, network communication.

[0020] Specifically, in the actual application process, the battery management controller 200 can determine whether the power battery assembly 101 is in a charging state. For example, the charger 400 can communicate with the battery management controller 200, so that when the charger 400 charges the power battery assembly 101 through the charging circuit, the information that the power battery assembly 101 is in a charging state is sent to the battery management controller 200. Further, when it is determined that the charger 400 charges the power battery assembly 101 through the charging circuit, leakage detection and positioning can be performed.

[0021] The above-mentioned method for detecting and locating leakage may include the following steps:

[0022] A1, when the power battery assembly 101 is charging, a first leakage detection instruction is sent to the leakage sensor 103, and when a first leakage alarm signal fed back by the leakage sensor 103 is received, a first leakage alarm signal is sent to the vehicle control unit 300 to control the power battery assembly 101 to unload.

[0023] Specifically, when it is determined that the charger 400 charges the power battery assembly 101 through the charging circuit, the battery management controller 200 may send a first request leakage detection instruction to the leakage sensor 103, so that the leakage sensor 103 performs leakage detection, and determines whether the leakage sensor 103 detects leakage. For example, the battery management controller 200 may start timing when sending the first request leakage detection instruction to the leakage sensor 103. If the first leakage alarm signal sent by the leakage sensor 103 is still not received after waiting for the third preset time, it can be considered that there is no leakage. For another example, the battery management controller 200 may also enter a waiting state after sending the first request leakage detection instruction to the leakage sensor 103. If the leakage sensor 103 sends the first leakage alarm signal, it enters the subsequent processing flow; otherwise, it does not send a stop leakage detection instruction to the leakage sensor 103, so that the leakage sensor 103 continues to perform leakage detection until charging is completed.

[0024] When the battery management controller 200 receives the first leakage alarm signal sent by the leakage sensor 103, it sends the first leakage alarm signal to the vehicle control unit 300 to control the unloading of the power battery assembly 101. It also sends the first leakage alarm signal to the charger 400 to make the charger 400 unload, and within the second preset time after sending the first leakage alarm signal to the charger 400, when receiving the unloading completion signal sent by the charger 400, it sends a stop leakage detection instruction to the leakage sensor 103. For example, if the charger 400 uses a charging bow to charge the vehicle 10, the battery management controller 200 may send a first leakage alarm signal to the vehicle control unit 300 and the charger 400 upon receiving the first leakage alarm signal sent by the leakage sensor 103; after receiving the first leakage alarm signal, the charger 400 controls the charging bow to rise, and sends an unloading completion signal to the battery management controller 200 after the charging bow is raised; at the same time, the battery management controller 200 may start timing when sending the first leakage alarm signal to the charger 400, and issue an alarm if the unloading completion signal is not received within the second preset time; if the unloading completion signal is received, a stop leakage detection instruction is sent to the leakage sensor 103.

[0025] Among them, when the vehicle control unit 300 receives the first leakage alarm signal, it controls the load 102 in the load branch currently in the working state to unload, and when it is determined that the load 102 has been unloaded, it sends a high-voltage power-off instruction to the battery management controller 200. For example, when the vehicle control unit 300 receives the first leakage alarm signal, it can send a high-voltage system leakage alarm to the load 102 to unload the load 102 in the working state, and the load 102 will send an unloading completion signal to the vehicle control unit 300 after writing is completed, so that the vehicle control unit 300 can judge whether the load 102 in the working state has been completely unloaded, and then send a high-voltage power-off instruction after the load 102 in the working state has been completely unloaded.

[0026] A2, when receiving the high-voltage power-off instruction sent by the vehicle control unit 300 based on the first leakage alarm signal, controls the main positive contactor KM7 to disconnect, and sends a second request leakage detection instruction to the leakage sensor 103, and determines the leakage location according to whether the second leakage alarm signal fed back by the leakage sensor 103 is received within the first preset time.

[0027] Specifically, after the vehicle control unit 300 determines that the load 102 has been unloaded, it sends a high-voltage power-off instruction to the battery management controller 200. After receiving the high-voltage power-off instruction, the battery management controller 200 controls the main positive contactor KM7 to disconnect. Then, the battery management controller 200 sends a second request leakage detection instruction to the leakage sensor 103 to determine the leakage location. When determining the leakage location, the battery management controller 200 needs to determine that the charging system is leaking if it does not receive the second leakage alarm signal fed back by the leakage sensor 103 within the first preset time after sending the second request leakage detection instruction, and send a charging system leakage signal to the vehicle control unit 300. If it receives the second leakage alarm signal fed back by the leakage sensor 103, it determines that the high-voltage system is leaking, and sends a high-voltage system leakage signal to the vehicle control unit 300.

[0028] Optionally, after receiving the high-voltage power-off instruction, the battery management controller 200 controls the main positive contactor KM7 to disconnect, and can also send a high-voltage power-off success signal to the vehicle control unit 300. The vehicle control unit 300 determines whether the high-voltage power-off success signal is received, and if not, continues to wait; if so, delays the fourth preset time to determine whether the high-voltage system leakage signal sent by the battery management controller 200 is received; if received, it is determined that the high-voltage system is leaking, and if not, it is determined that the charging system is leaking.

[0029] Thus, it is possible to determine whether leakage occurs when the charger 400 is charging the power battery assembly 101, and to determine whether the leakage occurs in the high-voltage system or the charging system, which is helpful for maintenance personnel to quickly repair the faulty product according to the alarm information. Moreover, if it is determined that the vehicle 10 does not have leakage, the vehicle 10 can be quickly mobilized to change the charging position for charging so as to be quickly put into operation.

[0030] The charging circuit includes a positive charging contactor and a negative charging contactor. The multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor. The motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor. The DC-DC converter is connected in series with the DC contactor. The powertrain includes N parallel battery packs. The positive electrode of each battery pack is connected to the positive electrode of the power battery assembly 101 through a first switch. The negative electrode of each battery pack is connected to the negative electrode of the power battery assembly 101 through a second switch. N is a positive integer. As an example, see Figure 2 , including a maintenance switch assembly 500 including a total positive contactor KM7 and an isolating switch QS, a high-voltage distribution box assembly 600, and a current sensor LH, a main contactor K1, a main pre-charging contactor K2 on the first pre-charging circuit, a DC contactor K3, a DC pre-charging contactor K4 on the second pre-charging circuit, a charging contactor K5, a charging negative contactor K6, a pre-charging resistor R1, a charging fuse S1, a main fuse S2, a DC-DC fuse S3, a PTC fuse S4, an air conditioning fuse S5, an air compressor fuse S6, a motor M1; the power battery assembly 101 supplies power to the load 102 through the high-voltage distribution box assembly 600, and the leakage sensor 103 is installed between the negative electrode of the power battery assembly 101 and the high-voltage distribution box housing, and then detects the insulation resistance between the high-voltage circuit where the power battery assembly 101 is located and the housing (i.e., the vehicle body). When the insulation resistance is less than a preset resistance threshold, it is determined that leakage information is detected; the charger 400 uses a charging bow to charge the vehicle 10; the number of motor controllers is equal to that of motors, and both are at least one; the above-mentioned power battery assembly 101 is as follows Figure 3 As shown, it includes three battery packs, denoted as battery pack 1, battery pack 2, and battery pack 3, and also includes first switches: KM1, KM2, KM3, and second switches: KM4, KM5, KM6, and fuses: FU1, FU2, FU3, and current sensors LH1, LH2, LH3.

[0031] It should be noted that when the battery management controller 200 determines that the high voltage system is leaking, it is also used to: control the positive charging contactor, the negative charging contactor, the main contactor and the DC contactor to be disconnected, and control all the first switches and the second switches to be disconnected.

[0032] It should also be noted that after determining that the high-voltage system is leaking, the vehicle control unit 300 can issue a first leakage alarm, for example, it can display "the vehicle high-voltage system has a leakage" on a preset display screen. After determining that the charging system is leaking, the vehicle control unit 300 can issue a second leakage signal, for example, it can display "the system charging the vehicle has a leakage" on a preset display screen. If the maintenance personnel sends a power-on instruction according to the alarm information, such as in order to change the charging position of the vehicle 10, the vehicle control unit 300 can send a high-voltage power-on instruction to the battery management controller 200, and the battery management controller 200 controls the vehicle 10 to power on at high voltage after receiving the high-voltage power-on instruction.

[0033] Optionally, if the battery management controller 200 sends a charging system leakage alarm to the vehicle control unit 300, and the charging system leakage alarm points to a certain car 100, then if the maintenance personnel sends a power-on instruction based on the alarm information, such as in order to change the charging position of the vehicle 10, the vehicle control unit 300 can send a high-voltage power-on instruction to the battery management controller 200. After receiving the high-voltage power-on instruction, the battery management controller 200 controls the high-voltage power-on of the car 100.

[0034] In summary, the vehicle of the embodiment of the present invention can detect whether there is leakage when the charger charges the power battery assembly through the charging circuit, and control the charger to unload when leakage is detected, and then control the total positive contactor to disconnect, and perform leakage detection again after the total positive contactor is disconnected, so as to determine the leakage position according to the leakage detection result. Moreover, when leakage is detected during the charging process, the charger can be controlled to unload to reduce risks.

[0035] Figure 4 The present invention is a flowchart of a method for detecting and locating leakage in a vehicle according to an embodiment of the present invention.

[0036] In an embodiment of the present invention, the vehicle includes a vehicle control unit and M carriages, where M is a positive integer, and each carriage includes a power battery assembly, a leakage sensor and multiple load branches. The positive electrode of the power battery assembly is respectively connected to one end of the charging circuit and one end of each load branch through a total positive electrode contactor, the negative electrode of the power battery assembly is respectively connected to the other end of the charging circuit and the other end of each load branch, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection.

[0037] like Figure 4 As shown, the vehicle leakage detection and positioning method includes:

[0038] S11, when the power battery assembly is charged, a first leakage detection instruction is sent to the leakage sensor, and when a first leakage alarm signal fed back by the leakage sensor is received, a first leakage alarm signal is sent to the vehicle control unit to control the unloading of the power battery assembly.

[0039] S12, when receiving the high-voltage power-off instruction sent by the vehicle control unit based on the first leakage alarm signal, the main positive contactor is controlled to be disconnected, and a second leakage detection instruction request is sent to the leakage sensor, and the leakage location is determined according to whether the second leakage alarm signal fed back by the leakage sensor is received within the first preset time.

[0040] In one embodiment of the present invention, the leakage location is determined based on whether the second leakage alarm signal sent by the leakage sensor is received within the first preset time, including: if the second leakage alarm signal fed back by the leakage sensor is not received, it is determined that the charging system is leaking; if the second leakage alarm signal fed back by the leakage sensor is received, it is determined that the high-voltage system is leaking.

[0041] In one embodiment of the present invention, the vehicle leakage detection and positioning method further includes: within a second preset time after sending a first leakage alarm signal to the charger, upon receiving an unloading completion signal sent by the charger, sending a stop leakage detection instruction to the leakage sensor.

[0042] In one embodiment of the present invention, the charging circuit includes a positive charging contactor and a negative charging contactor, and the multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor, and the motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor, and the DC-DC converter is connected in series with the DC contactor. After determining that the high-voltage system is leaking, the method also includes: controlling the positive charging contactor, the negative charging contactor, the main contactor and the DC contactor to be disconnected.

[0043] It should be noted that, for other specific implementations of the method for detecting and locating leakage of a vehicle according to an embodiment of the present invention, reference may be made to the vehicle in the above-mentioned embodiment.

[0044] The leakage detection and positioning method of the vehicle in the embodiment of the present invention can detect whether there is leakage when the charger charges the power battery assembly through the charging circuit, and control the charger to unload when leakage is detected, and then control the total positive contactor to disconnect, and perform leakage detection again after the total positive contactor is disconnected, so as to determine the leakage position according to the leakage detection result. Moreover, when leakage is detected during the charging process, the charger can be controlled to unload to reduce risks.

[0045] 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 of computer-readable media (a non-exhaustive list) 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.

[0046] 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, a plurality of 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.

[0047] 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.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] 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.

[0050] 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.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] 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 vehicle, characterized in that: The invention comprises a battery management controller, a vehicle control unit and M carriages, where M is a positive integer, and each carriage comprises a power battery assembly, a leakage sensor and a plurality of load branches, wherein the positive electrode of the power battery assembly is respectively connected to one end of the charging circuit and one end of each load branch through a total positive electrode contactor, the negative electrode of the power battery assembly is respectively connected to the other end of the charging circuit and the other end of each load branch, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection; wherein the battery management controller is used for: When the power battery assembly is charging, a first leakage detection request instruction is sent to the leakage sensor, and when a first leakage alarm signal fed back by the leakage sensor is received, the first leakage alarm signal is sent to the vehicle control unit to control the power battery assembly to stop charging; Receive the high-voltage power-off instruction sent by the vehicle control unit based on the first leakage alarm signal, control the main positive contactor to disconnect, and send a second request leakage detection instruction to the leakage sensor, and determine the leakage location according to whether the second leakage alarm signal fed back by the leakage sensor is received within a first preset time.

2. The vehicle according to claim 1, characterized in that The determining of the leakage position according to whether the second leakage alarm signal fed back by the leakage sensor is received within the first preset time specifically includes: If the second leakage alarm signal fed back by the leakage sensor is not received, determining that the charging system is leaking; If the second leakage alarm signal fed back by the leakage sensor is received, it is determined that the high voltage system is leaking.

3. The vehicle according to claim 1, characterized in that The vehicle is charged by a charger, and the battery management controller is also used for: Within a second preset time after the first leakage alarm signal is sent to the charger, when an unloading completion signal sent by the charger is received, a leakage detection stop instruction is sent to the leakage sensor.

4. The vehicle according to claim 1, characterized in that The vehicle control unit is used for: When the first leakage alarm signal is received, the load in the load branch currently in operation is controlled to be unloaded, and when it is determined that the load unloading is completed, the high-voltage power-off instruction is sent to the battery management controller.

5. The vehicle according to claim 2, characterized in that The charging circuit includes a positive charging contactor and a negative charging contactor, the multiple load branches include a motor controller branch and a DC-DC converter branch, the motor controller branch includes a motor controller and a main contactor, the motor controller is connected in series with the main contactor, the DC-DC converter branch includes a DC-DC converter and a DC contactor, the DC-DC converter is connected in series with the DC contactor, wherein the battery management controller is further used to: The positive charging contactor, the negative charging contactor, the main contactor and the DC contactor are controlled to be disconnected.

6. The vehicle according to claim 5, characterized in that The power assembly includes N parallel battery packs, the positive electrode of each battery pack is connected to the positive electrode of the power battery assembly through a first switch, and the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through a second switch, N is a positive integer, wherein the battery management controller is further used to: Control all the first switches and the second switches to be turned off.

7. A method for detecting and locating leakage of a vehicle, characterized in that: The vehicle comprises a vehicle control unit and M carriages, where M is a positive integer, and each carriage comprises a power battery assembly, a leakage sensor and a plurality of load branches, wherein the positive electrode of the power battery assembly is respectively connected to one end of a charging circuit and one end of each of the load branches through a total positive electrode contactor, the negative electrode of the power battery assembly is respectively connected to the other end of the charging circuit and the other end of each of the load branches, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection; wherein the method comprises: When the power battery assembly is charged, a first leakage detection request instruction is sent to the leakage sensor, and when a first leakage alarm signal fed back by the leakage sensor is received, the first leakage alarm signal is sent to the vehicle control unit to control the power battery assembly to be unloaded; When receiving the high-voltage power-off instruction sent by the vehicle control unit based on the first leakage alarm signal, the main positive contactor is controlled to disconnect, and a second request leakage detection instruction is sent to the leakage sensor, and the leakage location is determined according to whether the second leakage alarm signal fed back by the leakage sensor is received within the first preset time.

8. The vehicle leakage detection and positioning method according to claim 7, characterized in that: The determining of the leakage position according to whether the second leakage alarm signal sent by the leakage sensor is received within the first preset time includes: If the second leakage alarm signal fed back by the leakage sensor is not received, it is determined that the charging system is leaking; if the second leakage alarm signal fed back by the leakage sensor is received, it is determined that the high-voltage system is leaking.

9. The vehicle leakage detection and positioning method according to claim 7, characterized in that: The method further comprises: Within a second preset time after the first leakage alarm signal is sent to the charger, when an unloading completion signal sent by the charger is received, a leakage detection stop instruction is sent to the leakage sensor.

10. The vehicle leakage detection and positioning method according to claim 8, characterized in that: The charging circuit includes a positive charging contactor and a negative charging contactor, the multiple load branches include a motor controller branch and a DC-DC converter branch, the motor controller branch includes a motor controller and a main contactor, the motor controller is connected in series with the main contactor, the DC-DC converter branch includes a DC-DC converter and a DC contactor, the DC-DC converter is connected in series with the DC contactor, wherein after determining that the high voltage system is leaking electricity, the method further includes: The positive charging contactor, the negative charging contactor, the main contactor and the DC contactor are controlled to be disconnected.

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