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 and M carriages, M is an integer greater than 1, and each carriage includes a battery management controller, a power battery assembly, a leakage sensor connected to the negative electrode of the corresponding power battery assembly, and a plurality of load circuit branches connected in parallel at both ends of the power battery assembly; the battery management controller sends a first request leakage detection instruction to the corresponding leakage sensor when the corresponding power battery assembly is in a discharge state, so that the leakage sensor performs a high-voltage leakage detection; the vehicle control unit determines whether the first carriage corresponding to the high-voltage leakage signal is an extended power supply carriage when receiving a high-voltage leakage signal sent by any battery management controller, and sends a leakage detection instruction to the battery management controller of the first carriage when the first carriage is an extended power supply carriage, so that the battery management controller performs a leakage positioning process. The vehicle can detect and locate 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 power supply branch 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 for detecting and locating leakage.

[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, a first embodiment of the present invention proposes a vehicle, including a vehicle control unit, a vehicle through-circuit and M carriages, M is an integer greater than 1, the vehicle through-circuit includes a first circuit and a second circuit that penetrate the whole vehicle, each carriage includes a battery management controller, a power battery assembly, a leakage sensor and a plurality of load branches, 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 electrode of the corresponding power battery assembly, the plurality of load branches include an auxiliary load branch, the auxiliary load branch includes an auxiliary load and an auxiliary positive contactor, the positive terminal of the auxiliary load is connected to the positive electrode of the corresponding power battery assembly through the auxiliary positive contactor, the negative terminal of the auxiliary load is connected to the negative electrode of the corresponding power battery assembly, the positive terminal of the auxiliary load is also connected to the first circuit through the positive through-contactor, and the negative terminal of the auxiliary load is also connected to the second circuit; wherein, the electric The battery management controller is used to send a first request leakage detection instruction to the corresponding leakage sensor when the corresponding power battery assembly is in a discharge state, so that the leakage sensor performs high-voltage leakage detection; the whole vehicle control unit is used to determine whether the first car corresponding to the high-voltage leakage signal is an extended power supply car when receiving the high-voltage leakage signal sent by any battery management controller, and when the first car is the extended power supply car, send a leakage detection instruction to the battery management controller of the first car, wherein the extended power supply car includes a car that supplies power to the whole vehicle through-line and / or a car whose auxiliary load is powered by the whole vehicle through-line; the battery management controller is also used to send a second request leakage detection instruction to the corresponding leakage sensor according to the leakage detection instruction, and send an auxiliary load leakage alarm signal to the whole vehicle control unit when receiving the leakage alarm signal fed back by the leakage sensor in response to the second request leakage detection instruction.

[0006] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a leakage detection and positioning method for a vehicle, wherein the vehicle includes a whole vehicle through-line and M carriages, where M is an integer greater than 1, and the whole vehicle through-line includes a first line and a second line that run through the whole vehicle, and each carriage includes a battery management controller, a power battery assembly, a leakage sensor and a plurality of load branches, 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 corresponding power battery assembly. When the corresponding power battery assembly is in a discharging state, the battery management controller sends a first request leakage detection instruction to the corresponding leakage sensor, so that the leakage sensor performs high-voltage leakage detection, and the plurality of load branches include an auxiliary load branch, and the auxiliary load branch includes an auxiliary load and an auxiliary positive contactor. The positive terminal of the auxiliary load is connected to the positive electrode of the corresponding power battery assembly through the auxiliary positive contactor, and the auxiliary The negative terminal of the load is connected to the negative terminal of the corresponding power battery assembly, the positive terminal of the auxiliary load is also connected to the first line through the positive through-contactor, and the negative terminal of the auxiliary load is also connected to the second line; wherein, the method includes: when receiving a high-voltage leakage signal sent by any battery management controller, judging whether the first car corresponding to the high-voltage leakage signal is an extended power supply car, wherein the extended power supply car includes a car that supplies power to the whole vehicle through-line and / or a car in which the auxiliary load is powered by the whole vehicle through-line; when the first car is an extended power supply car, sending a leakage detection instruction to the battery management controller of the first car, so that the battery management controller sends a second request leakage detection instruction to the corresponding leakage sensor, and when receiving the leakage alarm signal fed back by the leakage sensor for the second request leakage detection instruction, sending an auxiliary load leakage alarm signal to the whole vehicle control unit.

[0007] The vehicle and leakage detection and positioning method of the embodiment of the present invention can perform leakage detection on each car when the power battery assembly is in a discharge state, and when leakage is detected, the car where leakage occurs can be determined based on the leakage sensor that detects the high-voltage leakage signal, thereby detecting and positioning the leakage. Moreover, after determining the car where leakage occurs, it can also be determined whether the car is an extended power supply car, and when the car is an extended power supply car, the leakage of the car can be located to further determine whether the auxiliary load in the extended power supply car has leakage, thereby further realizing the precise positioning of the leakage position, so that maintenance personnel can repair the fault according to the acquired leakage position.

[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 It is a structural schematic diagram of a carriage of 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 vehicle leakage detection control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] 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, 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 with reference to the accompanying drawings are exemplary and should not be construed as limiting the present invention.

[0014] Figure 1 1 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

[0015] like Figure 1As shown, the vehicle 10 includes a vehicle control unit 300, a vehicle through-line 700 and M carriages 100, where M is an integer greater than 1, and the vehicle through-line 700 includes a first line and a second line that penetrate the vehicle, and each carriage 100 includes a battery management controller 200, a power battery assembly 101, a leakage sensor 103 and a plurality of load branches, each load branch is connected in parallel at both ends of the power battery assembly 101, and the leakage sensor 103 is connected to the negative electrode of the corresponding power battery assembly 101, and the plurality of load branches are connected to the negative electrode of the power battery assembly 101. The branch includes an auxiliary load branch, the auxiliary load branch includes an auxiliary load 102 and an auxiliary positive contactor KM7, the positive terminal of the auxiliary load 102 is connected to the positive electrode of the corresponding power battery assembly 101 through the auxiliary positive contactor KM7, the negative terminal of the auxiliary load 102 is connected to the negative electrode of the corresponding power battery assembly 101, the positive terminal of the auxiliary load 102 is also connected to the first line through the positive through contactor KM8, and the negative terminal of the auxiliary load 102 is also connected to the second line; wherein, the battery management controller 20 0, used for sending a first request leakage detection instruction to the corresponding leakage sensor 103 when the corresponding power battery assembly 101 is in a discharging state, so that the leakage sensor 103 performs high-voltage leakage detection; the vehicle control unit 300, used for, when receiving a high-voltage leakage signal sent by any battery management controller 200, determining whether the first car 100 corresponding to the high-voltage leakage signal is an extended power supply car, and when the first car 100 is an extended power supply car, sending a leakage detection instruction to the battery management controller 200 of the first car 100, wherein the extended power supply car includes a car 100 that supplies power to the vehicle through line 700 and / or a car 100 where the auxiliary load 102 is powered by the vehicle through line 700; the battery management controller 200, further used for sending a second request leakage detection instruction to the corresponding leakage sensor 103 according to the leakage detection instruction, and sending an auxiliary load leakage alarm signal to the vehicle control unit 300 when receiving a leakage alarm signal fed back by the leakage sensor 103 in response to the second request leakage detection instruction.

[0016] 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 Detailed description of the battery management controller 200 and the power battery assembly 101. 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).

[0017] The above-mentioned multiple loads include a motor controller branch and an auxiliary load branch. The above-mentioned auxiliary load 102 may include, for example, a DC-DC converter, an air conditioner, a wind source system, an air compressor, a PTC (Positive Temperature Coefficient) electric heating device, etc. The vehicle control unit 300 may communicate with the battery management controller 200, the motor controller 104, and the auxiliary load 102 in each carriage 100 to control them, and the communication method may be, for example, network communication; the battery management controller 200 may communicate with the leakage sensor 103 to control it, and the communication method may be, for example, network communication.

[0018] Each of the above-mentioned carriages 100 is connected to the vehicle through-circuit 700 by means of a positive through-contactor KM8 and a negative through-contactor KM12, and the vehicle through-circuit 700 can be, for example, a through-line. For a carriage, if its negative through-contactor KM12 and positive through-contactor KM8 are disconnected, it is a non-extended power supply carriage; if its negative through-contactor KM12 and positive through-contactor KM8 are closed, it is an extended power supply carriage. As an example, the battery management controller 200 can determine whether the corresponding carriage 100 is an auxiliary power supply carriage 100 based on the charge state of the power battery assembly 101 in the M carriages 100; the type of the carriage 100 can be defaulted to a non-auxiliary power supply carriage 100, and the vehicle control unit 300 can obtain the battery SOC (State of Charge) of the power battery assembly 101 in the M carriages 100. Charge, state of charge) value, obtain the maximum battery SOC value and the minimum battery SOC value among the M battery SOC values, and obtain the carriage 100 corresponding to the maximum battery SOC value and the minimum battery SOC value, calculate the first difference between the maximum battery SOC value and the minimum battery SOC value, when the first difference is greater than a first preset value, control the negative electrode through contactor KM12 and the positive electrode through contactor KM8 in the carriage 100 corresponding to the maximum battery SOC value and the carriage 100 corresponding to the minimum battery SOC value to be closed, and control the auxiliary positive electrode contactor KM7 and the auxiliary negative electrode contactor KM11 in the carriage 100 corresponding to the minimum battery SOC value to be disconnected, and the carriage 100 corresponding to the maximum battery SOC value supplies power to the auxiliary load in the carriage 100 corresponding to the minimum battery SOC value through the vehicle through line 700.

[0019] The power battery assembly 101 includes N battery packs, N positive switches and N negative switches. The positive electrode of each battery pack is connected to the positive electrode of the power battery assembly 101 through the corresponding positive switch, and the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly 101 through the corresponding negative switch. The motor controller branch includes the motor controller 104 and the traction negative contactor KM10. The negative terminal of the motor controller 104 is connected to the negative electrode of the power battery assembly 101 through the traction negative contactor KM10. The auxiliary load branch includes the auxiliary load 102 and the auxiliary positive contactor KM7. The positive terminal of the auxiliary load 102 is connected to the positive electrode of the corresponding power battery assembly 101 through the auxiliary positive contactor KM7. The auxiliary load branch also includes the auxiliary negative contactor KM11. The negative terminal of the auxiliary load 102 is connected to the negative electrode of the corresponding power battery assembly 101 through the auxiliary negative contactor KM11.

[0020] The auxiliary load 102 can be started when it receives a high-voltage power-on command sent by the vehicle control unit 300, and send a high-voltage power-on success signal to the vehicle control unit 300; the auxiliary load 102 can also be unloaded when it receives a leakage alarm signal sent by the vehicle control unit 300, and send an unloading success signal to the vehicle control unit 300.

[0021] The motor controller 104 can start up when receiving a high-voltage power-on command sent by the vehicle control unit 300, and send a high-voltage power-on success signal to the vehicle control unit 300; the motor controller 104 can also unload when receiving a leakage alarm signal sent by the vehicle control unit 300, and send an unloading success signal to the vehicle control unit 300. The motor controller 104 corresponds to the motor, and the number of each is at least one.

[0022] The leakage sensor 103 may start leakage detection upon receiving a leakage detection request instruction sent by the battery management controller 200 ; and stop leakage detection upon receiving a leakage detection stop instruction sent by the battery management controller 200 .

[0023] The battery management controller 200 can execute a high-voltage power-off process to control high-voltage power-off, and can also execute an auxiliary power-off process to control auxiliary power-off. When executing the high-voltage power-off process, the battery management controller 200 is specifically used to: control or keep all positive switches and all negative switches in the corresponding power battery assembly 101 disconnected. When executing the auxiliary power-off process, the battery management controller 200 is specifically used to: keep the corresponding auxiliary positive contactor KM7 disconnected, and control the corresponding auxiliary negative contactor KM11 to disconnect.

[0024] As an example, a compartment 100 in the vehicle 10 may be Figure 2 As shown, the power battery assembly 101 can be Figure 3 As shown. In this specific example, the power battery assembly 101 includes three battery packs, which are recorded as battery pack 1, battery pack 2, and battery pack 3, and also includes positive switches: KM1-1, KM1-2, KM1-3, and negative switches: KM1-4, KM1-5, KM1-6, and fuses: FU1, FU2, FU3, and current sensors LH1, LH2, and LH3. It also includes a DC charger assembly 400, a maintenance switch assembly 500 including a total positive contactor KM2 and an isolating switch QS, a high-voltage distribution box assembly 600, and a charging positive contactor KM3, a main contactor KM4, a main pre-charging contactor KM5, an auxiliary pre-charging contactor KM6, a charging negative contactor KM13, a pre-charging resistor R1, a charging insurance S1, a main insurance S2, a DC-DC insurance S3, an air conditioning insurance S5, an air compressor insurance S6, and a current sensor LH. The DC charger assembly 400 is connected to the high-voltage distribution box assembly 600 through a charging connection device; 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 branch where the power battery assembly 101 is located and the housing (vehicle body). When the insulation resistance is less than the preset resistance threshold, it is determined that leakage information is detected. The battery management controller 200 can control the above-mentioned positive switch, negative switch, and the attraction and disconnection of each contactor.

[0025] In the actual application of the vehicle 10, specifically, the battery management controller 200 can determine whether the power battery assembly 101 is in a discharge state. For example, a first time interval can be preset for the battery management controller 200, and then if the battery management controller 200 determines that the power battery assembly 101 is not in a discharge state, it can perform a determination on whether the power battery assembly 101 is in a discharge state every first time interval.

[0026] Furthermore, if the battery management controller 200 determines that the power battery assembly 101 is in a discharge state, a first leakage detection request instruction is sent to each leakage sensor 103. After receiving the first leakage detection request instruction, the leakage sensor 103 performs high-voltage leakage detection until leakage information is detected, and sends leakage alarm information to the battery management controller 200. After receiving the leakage alarm information, the battery management controller 200 sends a high-voltage leakage signal to the vehicle control unit 300, and then the vehicle control unit 300 can perform leakage detection and positioning.

[0027] The above-mentioned method for detecting and locating leakage may include the following steps:

[0028] A1, when receiving a high-voltage leakage signal sent by any battery management controller 200, determine whether the first car 100 corresponding to the high-voltage leakage signal is an extended power supply car.

[0029] A2, when the first compartment 100 is an extended power supply compartment, a leakage detection instruction is sent to the battery management controller 200 of the first compartment 100, so that the battery management controller 200 executes a leakage location process.

[0030] Specifically, when the vehicle control unit 300 receives a high-voltage leakage signal sent by any battery management controller 200, it determines whether the first car 100 where the leakage occurs is an extended power supply car.

[0031] When the first car 100 is not an extended power supply car, the vehicle control unit 300 controls the motor controller 104 in the motor controller branch of the first car 100 to unload, and after the motor controller 104 of the first car 100 is unloaded, sends a high-voltage power-off instruction to the battery management controller 200 of the first car 100, so that the battery management controller 200 of the first car 100 executes the high-voltage power-off process.

[0032] Thus, when leakage occurs in the non-extended power supply carriage, the motor controller 104 in the carriage 100 can be controlled to unload, and the battery management controller 200 in the carriage 100 can execute the high-voltage power-off process.

[0033] When the first compartment 100 is an extended power supply compartment, the vehicle control unit 300 sends a leakage detection instruction to the battery management controller 200 of the first compartment 100. Before sending the second request leakage detection instruction, the battery management controller 200 controls all positive switches and all negative switches in the corresponding power battery assembly 101 to be disconnected, and controls the corresponding traction negative contactor KM10 and auxiliary positive contactor KM7 to be disconnected.

[0034] Furthermore, the battery management controller 200 sends a second request leakage detection instruction to the corresponding leakage sensor 103, and when receiving the leakage alarm signal sent by the leakage sensor 103 in response to the second request leakage detection instruction, sends the auxiliary load 102 leakage alarm signal to the vehicle control unit 300. Because when the battery management controller 200 sends the second request leakage detection instruction to the leakage sensor 103, the connection between the leakage sensor 103 in the first compartment 100 and the motor controller 104 and the battery pack in the first compartment 100 has been disconnected. Therefore, if the leakage sensor 103 cannot detect leakage after receiving the second request leakage detection instruction, the motor controller 104 can be controlled to unload and the high-voltage power-off process can be controlled to be executed; if the leakage sensor 103 can detect leakage after receiving the second request leakage detection instruction, the auxiliary power-off process can be controlled to be executed. In this way, the leakage position can be detected, and then the vehicle control unit 300 can perform corresponding control according to the position where the leakage occurs.

[0035] Specifically, when the vehicle control unit 300 does not receive the leakage signal of the auxiliary load 102 sent by the battery management controller 200 of the first compartment 100, it controls the motor controller 104 of the first compartment 100 to unload, and after the motor controller 104 of the first compartment 100 completes the unloading, it sends a high-voltage power-off instruction to the battery management controller 200 of the first compartment 100, so that the battery management controller 200 of the first compartment 100 executes the high-voltage power-off process.

[0036] When the vehicle control unit 300 receives the leakage signal of the auxiliary load 102 sent by the battery management controller 200 of the first compartment 100, the vehicle control unit 300 controls the unloading of the auxiliary load 102 in the auxiliary load branch of the first compartment 100, and after the unloading of the auxiliary load 102 in the first compartment 100 is completed, sends an auxiliary power-off instruction to the battery management controller 200 of the first compartment 100, so that the battery management controller 200 of the first compartment 100 executes the auxiliary power-off process.

[0037] Thereby, when leakage occurs in the extended power supply carriage 100, the location where the leakage occurs can be specifically determined.

[0038] In one embodiment of the present invention, after executing the auxiliary power-off process, the battery management controller 200 is further used to: control all positive switches and all negative switches in the corresponding power battery assembly 101 to close, and control the corresponding traction negative contactor KM10 to close. In this way, the motor controller 104 can be restored to work as soon as possible.

[0039] In summary, the vehicle of the embodiment of the present invention can perform leakage detection on each compartment when the power battery assembly is in a discharge state, and when leakage is detected, the compartment where leakage occurs can be determined based on the leakage sensor that detects the high-voltage leakage signal, thereby detecting and locating the leakage. Moreover, after determining the compartment where leakage occurs, it can also be determined whether the compartment is an extended power supply compartment, and if the compartment is an extended power supply compartment, leakage location can be performed on the compartment to further determine the location where leakage occurs.

[0040] 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.

[0041] In an embodiment of the present invention, a vehicle includes a vehicle through-circuit and M carriages, where M is an integer greater than 1, and the vehicle through-circuit includes a first circuit and a second circuit that run through the vehicle, and each carriage includes a battery management controller, a power battery assembly, a leakage sensor, and a plurality of 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 corresponding power battery assembly. When the corresponding power battery assembly is in a discharging state, the battery management controller sends a first request leakage detection instruction to the corresponding leakage sensor, so that the leakage sensor performs a high-voltage leakage detection, and the plurality of load branches include an auxiliary load branch, and the auxiliary load branch includes an auxiliary load and an auxiliary positive contactor, and the positive terminal of the auxiliary load is connected to the positive electrode of the corresponding power battery assembly through the auxiliary positive contactor, and the negative terminal of the auxiliary load is connected to the negative electrode of the corresponding power battery assembly, and the positive terminal of the auxiliary load is also connected to the first circuit through the positive through-contactor, and the negative terminal of the auxiliary load is also connected to the second circuit.

[0042] like Figure 4 As shown, the vehicle leakage detection and positioning method includes:

[0043] S11, when receiving a high-voltage leakage signal sent by any battery management controller, determine whether the first car corresponding to the high-voltage leakage signal is an extended power supply car, wherein the extended power supply car includes a car that supplies power to the whole vehicle through-line and / or a car whose auxiliary load is powered by the whole vehicle through-line.

[0044] S12, when the first car is an extended power supply car, sends a leakage detection instruction to the battery management controller of the first car, so that the battery management controller sends a second request leakage detection instruction to the corresponding leakage sensor, and when receiving the leakage alarm signal fed back by the leakage sensor in response to the second request leakage detection instruction, sends an auxiliary load leakage alarm signal to the vehicle control unit.

[0045] In one embodiment of the present invention, multiple loads include a motor controller branch, and the vehicle leakage detection and positioning method also includes: when the first compartment is not an extended power supply compartment, controlling the motor controller in the motor controller branch of the first compartment to unload, and after the motor controller in the first compartment is unloaded, sending a high-voltage power-off instruction to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes the high-voltage power-off process.

[0046] In one embodiment of the present invention, the multiple loads also include an auxiliary load branch, and the vehicle leakage detection and positioning method also includes: when the auxiliary load leakage signal sent by the battery management controller of the first compartment is not received, controlling the motor controller of the first compartment to unload, and after the motor controller of the first compartment is unloaded, sending a high-voltage power-off instruction to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes the high-voltage power-off process; when the auxiliary load leakage signal sent by the battery management controller of the first compartment is received, controlling the auxiliary load in the auxiliary load branch of the first compartment to unload, and after the auxiliary load of the first compartment is unloaded, sending an auxiliary power-off instruction to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes the auxiliary power-off process.

[0047] In one embodiment of the present invention, a power battery assembly includes N battery packs, N positive switches and N negative switches, the positive electrode of each battery pack is connected to the positive electrode of the power battery assembly through the corresponding positive switch, and the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through the corresponding negative switch. The motor controller branch includes a motor controller and a traction negative contactor, and the negative terminal of the motor controller is connected to the negative electrode of the power battery assembly through the traction negative contactor; wherein, before the battery management controller sends the second request leakage detection instruction, it also controls all positive switches and all negative switches in the corresponding power battery assembly to be disconnected, and controls the corresponding traction negative contactor and auxiliary positive contactor to be disconnected.

[0048] 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.

[0049] The vehicle leakage detection and positioning method of the embodiment of the present invention can perform leakage detection on each car when the power battery assembly is in a discharge state, and when leakage is detected, the car where leakage occurs can be determined based on the leakage sensor that detects the high-voltage leakage signal, thereby detecting and locating the leakage. Moreover, after determining the car where leakage occurs, it can also be determined whether the car is an extended power supply car, and if the car is an extended power supply car, leakage positioning of the car can be performed to further determine the location of the leakage.

[0050] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein 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.

[0051] 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 embodiment, 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. 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.

[0052] 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.

[0053] In the description of this specification, 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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 cannot be understood as a limitation on the present invention.

[0054] 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.

[0055] In the description of this specification, unless otherwise specified, 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.

[0056] 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.

[0057] 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: It includes a vehicle control unit, a vehicle through-line and M carriages, where M is an integer greater than 1, the vehicle through-line includes a first line and a second line that penetrate the whole vehicle, each carriage includes a battery management controller, a power battery assembly, a leakage sensor and a plurality of load branches, 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 electrode of the corresponding power battery assembly, the plurality of load branches include an auxiliary load branch, the auxiliary load branch includes an auxiliary load and an auxiliary positive contactor, the positive terminal of the auxiliary load is connected to the positive electrode of the corresponding power battery assembly through the auxiliary positive contactor, the negative terminal of the auxiliary load is connected to the negative electrode of the corresponding power battery assembly, the positive terminal of the auxiliary load is also connected to the first line through the positive through-contactor, and the negative terminal of the auxiliary load is also connected to the second line; wherein, The battery management controller is used to send a first request leakage detection instruction to the corresponding leakage sensor when the corresponding power battery assembly is in a discharge state, so that the leakage sensor performs high-voltage leakage detection; The vehicle control unit is used to determine whether the first car corresponding to the high-voltage leakage signal is an extended power supply car when receiving a high-voltage leakage signal sent by any battery management controller, and send a leakage detection instruction to the battery management controller of the first car when the first car is an extended power supply car, wherein the extended power supply car includes a car that supplies power to the vehicle through-line and / or a car whose auxiliary load is powered by the vehicle through-line; The battery management controller is further configured to send a second request leakage detection instruction to the corresponding leakage sensor according to the leakage detection instruction, and send an auxiliary load leakage alarm signal to the vehicle control unit upon receiving a leakage alarm signal fed back by the leakage sensor in response to the second request leakage detection instruction; The plurality of load branches also include a motor controller branch, and the vehicle control unit is further used for: When the first carriage is not an extended power supply carriage, controlling the motor controller in the motor controller branch of the first carriage to unload, and after the motor controller of the first carriage is unloaded, sending a high-voltage power-off instruction to the battery management controller of the first carriage, so that the battery management controller of the first carriage executes a high-voltage power-off process; The vehicle control unit is also used for: When the auxiliary load leakage signal sent by the battery management controller of the first compartment is not received, the motor controller of the first compartment is controlled to unload, and after the motor controller of the first compartment has completed unloading, a high-voltage power-off instruction is sent to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes a high-voltage power-off process; Upon receiving the auxiliary load leakage signal sent by the battery management controller of the first compartment, controlling the auxiliary load in the auxiliary load branch of the first compartment to unload, and after the auxiliary load of the first compartment is unloaded, sending an auxiliary power-off instruction to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes the auxiliary power-off process; The power battery assembly includes N battery packs, N positive switches and N negative switches, the positive electrode of each battery pack is connected to the positive electrode of the power battery assembly through the corresponding positive switch, and the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through the corresponding negative switch. The motor controller branch includes a motor controller and a traction negative electrode contactor, and the negative terminal of the motor controller is connected to the negative electrode of the power battery assembly through the traction negative electrode contactor; wherein, before sending the second request leakage detection instruction, the battery management controller is further used to: Control all positive switches and all negative switches in the corresponding power battery assembly to disconnect, and control the corresponding traction negative contactor and auxiliary positive contactor to disconnect.

2. The vehicle according to claim 1, characterized in that The auxiliary load branch also includes an auxiliary negative electrode contactor, and the negative terminal of the auxiliary load is connected to the negative electrode of the corresponding power battery assembly through the auxiliary negative electrode contactor; wherein, When executing the high-voltage power-down process, the battery management controller is specifically used to: control or keep all positive switches and all negative switches in the corresponding power battery assembly disconnected; When executing the auxiliary power-down process, the battery management controller is specifically used to: keep the corresponding auxiliary positive contactor disconnected, and control the corresponding auxiliary negative contactor to disconnect.

3. The vehicle according to claim 2, characterized in that After executing the auxiliary power-down process, the battery management controller is further used to: Control all positive switches and all negative switches in the corresponding power battery assembly to close, and control the corresponding traction negative contactor to close.

4. A method for detecting and locating leakage of a vehicle, characterized in that: The vehicle includes a vehicle control unit, a vehicle through-line and M carriages, where M is an integer greater than 1, the vehicle through-line includes a first line and a second line that penetrate the vehicle, each carriage includes a battery management controller, a power battery assembly, a leakage sensor and a plurality of load branches, 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 electrode of the corresponding power battery assembly, the battery management controller sends a first request leakage detection instruction to the corresponding leakage sensor when the corresponding power battery assembly is in a discharge state, so that the leakage sensor performs high-voltage leakage detection, the plurality of load branches include an auxiliary load branch, the auxiliary load branch includes an auxiliary load and an auxiliary positive contactor, the positive terminal of the auxiliary load is connected to the positive electrode of the corresponding power battery assembly through the auxiliary positive contactor, the negative terminal of the auxiliary load is connected to the negative electrode of the corresponding power battery assembly, the positive terminal of the auxiliary load is also connected to the first line through the positive through-contactor, and the negative terminal of the auxiliary load is also connected to the second line; wherein the method includes: When a high-voltage leakage signal sent by any battery management controller is received, it is determined whether the first carriage corresponding to the high-voltage leakage signal is an extended power supply carriage, wherein the extended power supply carriage includes a carriage that supplies power to the whole vehicle through-line and / or a carriage whose auxiliary load is powered by the whole vehicle through-line; When the first carriage is an extended power supply carriage, a leakage detection instruction is sent to the battery management controller of the first carriage, so that the battery management controller sends a second request leakage detection instruction to the corresponding leakage sensor, and upon receiving the leakage alarm signal fed back by the leakage sensor in response to the second request leakage detection instruction, an auxiliary load leakage alarm signal is sent to the vehicle control unit; The plurality of load branches also include a motor controller branch, and the method further includes: When the first carriage is not an extended power supply carriage, controlling the motor controller in the motor controller branch of the first carriage to unload, and after the motor controller of the first carriage is unloaded, sending a high-voltage power-off instruction to the battery management controller of the first carriage, so that the battery management controller of the first carriage executes a high-voltage power-off process; The method further comprises: When the auxiliary load leakage signal sent by the battery management controller of the first compartment is not received, the motor controller of the first compartment is controlled to unload, and after the motor controller of the first compartment has completed unloading, a high-voltage power-off instruction is sent to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes a high-voltage power-off process; Upon receiving the auxiliary load leakage signal sent by the battery management controller of the first compartment, controlling the auxiliary load in the auxiliary load branch of the first compartment to unload, and after the auxiliary load of the first compartment is unloaded, sending an auxiliary power-off instruction to the battery management controller of the first compartment, so that the battery management controller of the first compartment executes the auxiliary power-off process; The power battery assembly includes N battery packs, N positive switches and N negative switches, the positive electrode of each battery pack is connected to the positive electrode of the power battery assembly through the corresponding positive switch, and the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through the corresponding negative switch. The motor controller branch includes a motor controller and a traction negative contactor, and the negative terminal of the motor controller is connected to the negative electrode of the power battery assembly through the traction negative contactor; wherein, before the battery management controller sends the second request leakage detection instruction, it also controls all positive switches and all negative switches in the corresponding power battery assembly to be disconnected, and controls the corresponding traction negative contactor and auxiliary positive contactor to be disconnected.

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