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 vehicle control unit, a battery management controller, a leakage sensor, a power battery assembly, and multiple load branches, each of which is connected in parallel at both ends of the power battery assembly, and the leakage sensor is connected to the negative electrode of the power battery assembly. The leakage detection and positioning method of the vehicle includes: when the battery management controller receives a low-voltage power-on success signal sent by the vehicle control unit, it sends a leakage detection request instruction to the leakage sensor so that the leakage sensor performs leakage detection; when the battery management controller receives a leakage alarm signal fed back by the leakage sensor, it sends a load-end leakage signal to the vehicle control unit so that the vehicle control unit ends the high-voltage power-on process. The leakage detection and positioning method of the vehicle can realize the detection and positioning of leakage.

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 the vehicle is working, if leakage occurs, it will not only impact the vehicle's power supply circuit, 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, the first object of the present invention is to provide a method for detecting and locating leakage of a vehicle, so as to detect and locate leakage of the vehicle.

[0004] A second object of the present invention is to provide a vehicle.

[0005] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present invention proposes a leakage detection and positioning method for a vehicle, wherein the vehicle includes a vehicle control unit, a battery management controller, a leakage sensor, a power battery assembly, and multiple load branches, each of which is connected in parallel at both ends of the power battery assembly, and the leakage sensor is connected to the negative electrode of the power battery assembly. The method includes: when the battery management controller receives a low-voltage power-on success signal sent by the vehicle control unit, the battery management controller sends a leakage detection request instruction to the leakage sensor so that the leakage sensor performs a leakage detection; when the battery management controller receives a leakage alarm signal fed back by the leakage sensor, the battery management controller sends a load-end leakage signal to the vehicle control unit so that the vehicle control unit ends the high-voltage power-on process.

[0006] To achieve the above-mentioned purpose, the second aspect 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 multiple load branches, the power battery assembly includes a battery pack, each of the load branches is connected in parallel at both ends of the power battery assembly, the leakage sensor is connected to the negative pole of the power battery assembly for leakage detection; the battery management controller is used to send a leakage detection request instruction to the leakage sensor when receiving a low-voltage power-on success signal sent by the vehicle control unit, so that the leakage sensor performs leakage detection, and when receiving a leakage alarm signal fed back by the leakage sensor, send a load-end leakage signal to the vehicle control unit, so that the vehicle control unit ends the high-voltage power-on process.

[0007] The vehicle and leakage detection and positioning method of the embodiment of the present invention can realize that when the vehicle is powered on, leakage detection is first performed after the vehicle control unit controls the low-voltage power-on. Since the current vehicle has only completed the low-voltage power-on but not the high-voltage power-on, leakage detection is performed at this time to quickly determine whether it is a load leakage. When the load is leaking, the high-voltage power-on process is directly terminated, and high-voltage power-on is performed when the load is not leaking. In this way, leakage detection and positioning are performed during the power-on process, which can provide maintenance personnel with fast and accurate maintenance guidance.

[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 1As 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 and multiple load branches. The power battery assembly 101 includes a battery pack, and each load branch is connected in parallel at both ends of the power battery assembly 101. The leakage sensor 103 is connected to the negative electrode of the power battery assembly 101 for leakage detection; the battery management controller 200 is used to send a leakage detection request instruction to the leakage sensor 103 when receiving a low-voltage power-on success signal sent by the vehicle control unit 300, so that the leakage sensor 103 performs leakage detection, and when receiving a leakage alarm signal fed back by the leakage sensor 103, send a load-end leakage signal to the vehicle control unit 300, so that the vehicle control unit 300 ends the high-voltage power-on process. 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. The load 102 may be started after receiving a high-voltage power-on instruction 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 a high-voltage system leakage signal sent by the vehicle control unit 300, and send an unloading completion message to the vehicle control unit 300. The communication between the vehicle control unit 300, the battery management controller 200, the leakage sensor 103, and the load 102 may be, for example, network communication.

[0017] Specifically, in the actual application process, the vehicle control unit 300 can determine whether a power-on signal is collected, and the power-on signal can be, for example, a power-on signal issued by an operator and maintainer. After collecting the power-on signal, the vehicle controller controls low-voltage power-on, and sends a low-voltage power-on success signal to the battery management controller 200 and the load 102 after the low-voltage power-on is successful. Then, the vehicle 10 can be detected and located for leakage.

[0018] The above method for detecting and locating leakage of the vehicle 10 may include the following steps:

[0019] A1, when the battery management controller 200 receives the low voltage power-on success signal sent by the vehicle control unit 300, it sends a leakage detection request instruction to the leakage sensor 103, so that the leakage sensor 103 performs leakage detection.

[0020] A2, when the battery management controller 200 receives the leakage alarm signal fed back by the leakage sensor 103, it sends a load-end leakage signal to the vehicle control unit 300, so that the vehicle control unit 300 ends the high-voltage power-on process.

[0021] Optionally, when the battery management controller 200 sends a load-end leakage signal to the vehicle controller, the carriage 100 where the load 102 is leaking can be determined, for example, based on the carriage 100 where the leakage sensor 103 detecting the leakage is located, so as to further locate the leakage.

[0022] In this way, it is possible to control the leakage sensor 103 to perform leakage detection after the vehicle controller controls the low voltage to power on. If leakage is detected at this time, it means that leakage existed before the vehicle was powered on, and it is determined that there is leakage in the load 102, thereby performing leakage detection and positioning of the vehicle 10.

[0023] Furthermore, the vehicle control unit 300 is also used to send a high-voltage power-on instruction to the battery management controller 200 if no load-side leakage signal is received within the first preset time after sending the low-voltage power-on success signal. At this time, the battery management controller 200 is also used to: when receiving the high-voltage power-on instruction sent by the vehicle control unit 300, send a stop leakage detection instruction to the leakage sensor 103, and perform high-voltage power-on control, and after the high-voltage power-on is successful, feed back a high-voltage power-on success signal to the vehicle control unit 300.

[0024] It should be noted that after the high-voltage power-on is successful, the battery management controller 200 is also used to: send a leakage detection request instruction to the leakage sensor 103 so that the leakage sensor 103 performs leakage detection, and when receiving the leakage alarm signal fed back by the leakage sensor 103, send a high-voltage system leakage signal to the vehicle control unit 300, so that the vehicle control unit 300 sends a high-voltage system leakage signal to the load 102 in each load branch and ends the high-voltage power-on process.

[0025] If the high-voltage system leakage signal is not received within the second preset time after the vehicle control unit 300 receives the high-voltage power-on success signal, a high-voltage power-on instruction is sent to the load 102 in each load branch to start the corresponding load 102. Since the battery management controller 200 needs to send a leakage detection request instruction to the leakage sensor 103 while sending the high-voltage power-on success signal to the vehicle controller, if the vehicle control unit 300 does not receive the high-voltage system leakage signal within the second preset time after receiving the high-voltage power-on success information, it can be considered that there is no leakage, and each load 102 is controlled to be powered on at high voltage to prepare the vehicle 10 for use. Then, after receiving the high-voltage power-on success signal sent by all loads 102, the vehicle control unit 300 determines that the load 102 is powered on and can send this information to the operation and maintenance personnel.

[0026] It should also be noted that when the battery management controller 200 receives the leakage alarm signal sent by the leakage sensor 103, the battery management controller 200 is also used to execute the power-off process to control the high-voltage power off of the carriage 100 corresponding to the leakage sensor 103.

[0027] Thus, when no leakage is detected after low voltage power-on, the vehicle 10 can be controlled to power up at high voltage to prepare for use. At the same time, leakage detection can be performed after high voltage power-on is successful, and high voltage power is de-energized when leakage is detected.

[0028] Among them, the above-mentioned multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller, a main contactor, and a first pre-charging circuit. The motor controller is connected in series with the main contactor, and the first pre-charging circuit is connected in parallel with the main contactor. The DC-DC converter branch includes a DC-DC converter, a DC contactor, and a second pre-charging circuit. The DC-DC converter is connected in series with the DC contactor, and the second pre-charging circuit is connected in parallel with the DC contactor. The first pre-charging circuit and the second pre-charging circuit share a pre-charging resistor. The first pre-charging circuit also includes a main pre-charging contactor connected in series with the pre-charging resistor, and the second pre-charging circuit also includes a DC pre-charging contactor connected in series with the pre-charging resistor. The powertrain includes N parallel battery packs, and the positive electrode of each battery pack is connected to the positive electrode of the power battery assembly 101 through a first switch, and 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 DC charger assembly 400, 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 insurance S1, a main insurance S2, a DC-DC insurance S3, a PTC insurance S4, an air conditioning insurance S5, an air compressor insurance S6, a motor M 1, the DC charger assembly 400 is connected to the high-voltage distribution box assembly 600 through a charging connection device; the number of motor controllers is the same as that of motor M1, and both are at least 1; 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, and when the insulation resistance is less than a preset resistance threshold, it is determined that leakage information is detected; 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.

[0029] The battery management controller 200 performs high-voltage power-on control including: the battery management controller 200 controls the first pre-charging circuit and the second pre-charging circuit to close, and controls the main contactor and the DC contactor to close after a delay of a third preset time, and controls the first pre-charging circuit and the second pre-charging circuit to disconnect. That is, if the vehicle control unit 300 does not receive a load-side leakage signal within the first preset time after sending the low-voltage power-on success information, it sends a high-voltage power-on instruction to the battery management controller 200, and the battery management controller 200 controls the first pre-charging circuit and the second pre-charging circuit to close, and controls the main contactor and the DC contactor to close after a delay of a third preset time, and controls the first pre-charging circuit and the second pre-charging circuit to disconnect. The value range of the third preset time can be 1 to 5 seconds, for example, 3 seconds.

[0030] The battery management controller 200 controls the first pre-charging circuit and the second pre-charging circuit to close, including: the battery management controller 200 controls the main pre-charging contactor and the DC pre-charging contactor to close. That is, the battery management controller 200 controls the main pre-charging contactor and the DC pre-charging contactor to close to achieve control of the first pre-charging circuit and the second pre-charging circuit to close.

[0031] The high voltage power-on control performed by the battery management controller 200 further includes: the battery management controller 200 controls all first switches and all second switches to close before controlling the main pre-charging contactor and the DC pre-charging contactor to close.

[0032] In summary, the leakage detection and positioning method of the vehicle of the embodiment of the present invention can be implemented when the vehicle is powered on. First, the leakage detection is performed after the vehicle control unit controls the low-voltage power-on, and when the leakage is detected, it is determined that the corresponding compartment load has a leakage. In this way, the leakage detection and positioning can be achieved, and the leakage can be detected before the vehicle starts to be powered on at high voltage, so that the leakage situation of the vehicle can be quickly detected and energy consumption can be saved. Moreover, the leakage detection is performed again after the vehicle is powered on at high voltage and before the load is powered on at high voltage, thereby further realizing the rapid detection of the leakage situation of the vehicle.

[0033] 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.

[0034] In an embodiment of the present invention, the vehicle includes a vehicle control unit, a battery management controller, a leakage sensor, a power battery assembly, and multiple load branches. Each load branch is connected in parallel at both ends of the power battery assembly, and the leakage sensor is connected to the negative electrode of the power battery assembly.

[0035] like Figure 4 As shown, the vehicle leakage detection and positioning method includes:

[0036] S11, when the battery management controller receives the low-voltage power-on success signal sent by the vehicle control unit, it sends a leakage detection request instruction to the leakage sensor, so that the leakage sensor performs leakage detection.

[0037] S12, when the battery management controller receives the leakage alarm signal fed back by the leakage sensor, it sends a load-end leakage signal to the vehicle control unit, so that the vehicle control unit ends the high-voltage power-on process.

[0038] In one embodiment of the present invention, the vehicle leakage detection and positioning method also includes: when the battery management controller receives the high-voltage power-on command sent by the vehicle control unit, it sends a stop leakage detection command to the leakage sensor and performs high-voltage power-on control, and after the high-voltage power-on is successful, it feeds back a high-voltage power-on success signal to the vehicle control unit; wherein the above-mentioned high-voltage power-on command is sent to the battery management controller by the vehicle control unit when the load-end leakage signal is not received within the first preset time after sending the low-voltage power-on success signal.

[0039] In one embodiment of the present invention, after the high voltage power-on is successful, the vehicle's leakage detection and positioning method also includes: the battery management controller sends a leakage detection request instruction to the leakage sensor, so that the leakage sensor performs leakage detection; when the battery management controller receives the leakage alarm signal fed back by the leakage sensor, it sends a high-voltage system leakage signal to the vehicle control unit, so that the vehicle control unit sends a high-voltage system leakage signal to the load in each load branch, and ends the high-voltage power-on process.

[0040] In one embodiment of the present invention, when the battery management controller receives the leakage alarm signal sent by the leakage sensor, the vehicle leakage detection and positioning method further includes: the battery management controller executes a power-off process.

[0041] In one embodiment of the present invention, multiple load branches include a motor controller branch and a DC-DC converter branch, the motor controller branch includes a motor controller, a main contactor, and a first pre-charging circuit, the motor controller is connected in series with the main contactor, and the first pre-charging circuit is connected in parallel with the main contactor, the DC-DC converter branch includes a DC-DC converter, a DC contactor, and a second pre-charging circuit, the DC-DC converter is connected in series with the DC contactor, and the second pre-charging circuit is connected in parallel with the DC contactor, wherein the battery management controller performs high-voltage power-on control including: the battery management controller controls the first pre-charging circuit and the second pre-charging circuit to close, and after a delay of a third preset time, controls the main contactor and the DC contactor to close, and controls the first pre-charging circuit and the second pre-charging circuit to disconnect.

[0042] In one embodiment of the present invention, the first pre-charging circuit and the second pre-charging circuit share a pre-charging resistor, the first pre-charging circuit also includes a main pre-charging contactor connected in series with the pre-charging resistor, the second pre-charging circuit also includes a DC pre-charging contactor connected in series with the pre-charging resistor, and the battery management controller controls the first pre-charging circuit and the second pre-charging circuit to close, including: the battery management controller controls the main pre-charging contactor and the DC pre-charging contactor to close.

[0043] In one embodiment of the present invention, 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 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 performs high-voltage power-on control further comprising: before controlling the main pre-charging contactor and the DC pre-charging contactor to close, the battery management controller also controls all the first switches and all the second switches to close.

[0044] 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.

[0045] In summary, the leakage detection and positioning method of the vehicle of the embodiment of the present invention can be implemented when the vehicle is powered on. First, the leakage detection is performed after the vehicle control unit controls the low-voltage power-on, and when the leakage is detected, it is determined that the corresponding compartment load has a leakage. In this way, the leakage detection and positioning can be achieved, and the leakage can be detected before the vehicle starts to be powered on at high voltage, so that the leakage situation of the vehicle can be quickly detected and energy consumption can be saved. Moreover, the leakage detection is performed again after the vehicle is powered on at high voltage and before the load is powered on at high voltage, thereby further realizing the rapid detection of the leakage situation of the vehicle.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 method for detecting and locating leakage of a vehicle, characterized in that: The vehicle includes a vehicle control unit, a battery management controller, a leakage sensor, a power battery assembly, and a plurality of load branches, each of which is connected in parallel at both ends of the power battery assembly, and the leakage sensor is connected to the negative electrode of the power battery assembly. The method includes: When the battery management controller receives the low-voltage power-on success signal sent by the vehicle control unit, it sends a leakage detection request instruction to the leakage sensor, so that the leakage sensor performs leakage detection; When the battery management controller receives the leakage alarm signal fed back by the leakage sensor, it sends a load-end leakage signal to the vehicle control unit, so that the vehicle control unit ends the high-voltage power-on process.

2. The method for detecting and locating leakage of a vehicle according to claim 1, characterized in that: The method further comprises: When the battery management controller receives the high-voltage power-on instruction sent by the vehicle control unit, it sends a stop leakage detection instruction to the leakage sensor, performs high-voltage power-on control, and after the high-voltage power-on is successful, it feeds back a high-voltage power-on success signal to the vehicle control unit; Among them, the high-voltage power-on instruction is sent to the battery management controller by the vehicle control unit when the load-end leakage signal is not received within the first preset time after sending the low-voltage power-on success signal.

3. The vehicle leakage detection and positioning method according to claim 2, characterized in that: After the high voltage is successfully powered on, the method further includes: The battery management controller sends a leakage detection request instruction to the leakage sensor, so that the leakage sensor performs leakage detection; When the battery management controller receives the leakage alarm signal fed back by the leakage sensor, it sends a high-voltage system leakage signal to the vehicle control unit, so that the vehicle control unit sends the high-voltage system leakage signal to the loads in each load branch and ends the high-voltage power-on process.

4. The vehicle leakage detection and positioning method according to claim 3, characterized in that: When the battery management controller receives the leakage alarm signal sent by the leakage sensor, the method further includes: The battery management controller executes a power-down process.

5. The vehicle leakage detection and positioning method according to any one of claims 2 to 4, characterized in that: The multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller, a main contactor, and a first pre-charging circuit. The motor controller is connected in series with the main contactor. The first pre-charging circuit is connected in parallel with the main contactor. The DC-DC converter branch includes a DC-DC converter, a DC contactor, and a second pre-charging circuit. The DC-DC converter is connected in series with the DC contactor. The second pre-charging circuit is connected in parallel with the DC contactor. The battery management controller performs high voltage power-on control including: The battery management controller controls the first pre-charging circuit and the second pre-charging circuit to be closed, and after a delay of a third preset time, controls the main contactor and the DC contactor to be closed, and controls the first pre-charging circuit and the second pre-charging circuit to be opened.

6. The vehicle leakage detection and positioning method according to claim 5, characterized in that: The first pre-charging circuit and the second pre-charging circuit share a pre-charging resistor, the first pre-charging circuit further includes a main pre-charging contactor connected in series with the pre-charging resistor, the second pre-charging circuit further includes a DC pre-charging contactor connected in series with the pre-charging resistor, and the battery management controller controls the first pre-charging circuit and the second pre-charging circuit to be closed, including: The battery management controller controls the main pre-charging contactor and the DC pre-charging contactor to close.

7. The vehicle leakage detection and positioning method according to claim 6, 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 performs high voltage power-on control further comprising: Before controlling the main pre-charging contactor and the DC pre-charging contactor to close, the battery management controller also controls all the first switches and all the second switches to close.

8. A vehicle, characterized in that: It includes a battery management controller, 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 a plurality of load branches, the power battery assembly includes a battery pack, each of the load branches is connected in parallel at both ends of the power battery assembly, and the leakage sensor is connected to the negative electrode of the power battery assembly for leakage detection; The battery management controller is used to send a leakage detection request instruction to the leakage sensor when receiving a low-voltage power-on success signal sent by the vehicle control unit, so that the leakage sensor performs leakage detection, and to send a load-end leakage signal to the vehicle control unit when receiving a leakage alarm signal fed back by the leakage sensor, so that the vehicle control unit ends the high-voltage power-on process.

9. The vehicle according to claim 8, characterized in that The battery management controller is also used for: When receiving the high-voltage power-on instruction sent by the vehicle control unit, sending a stop leakage detection instruction to the leakage sensor, and performing high-voltage power-on control, and after the high-voltage power-on is successful, feeding back a high-voltage power-on success signal to the vehicle control unit; Among them, the high-voltage power-on instruction is sent to the battery management controller by the vehicle control unit when the load-end leakage signal is not received within the first preset time after sending the low-voltage power-on success signal.

10. The vehicle according to claim 9, characterized in that After the high voltage is successfully powered on, the battery management controller is also used to: A leakage detection request instruction is sent to the leakage sensor so that the leakage sensor performs leakage detection, and when a leakage alarm signal fed back by the leakage sensor is received, a high-voltage system leakage signal is sent to the vehicle control unit so that the vehicle control unit sends a high-voltage system leakage signal to the loads in each load branch and ends the high-voltage power-on process.

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