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, each carriage includes a battery management controller, a power battery assembly including N parallel battery packs and a first leakage sensor connected to the negative electrode thereof, multiple load branches connected in parallel with the power battery assembly, and a second leakage sensor connected to the negative electrode of the battery pack, wherein the negative electrode of the battery pack is connected to the negative electrode of the power battery assembly through a negative electrode switch, and M and N are both positive integers; the battery management controller controls the first leakage sensor to perform leakage detection when the power battery assembly is in a high-voltage power-on state, and if leakage is detected, controls the connection between the above-mentioned negative electrode switch, the multiple load branches and the positive electrode of the power battery assembly to be disconnected; controls the above-mentioned leakage sensor to perform leakage detection, and if the first leakage sensor detects leakage, determines that the load is leaking, and if any of the second leakage sensors detects leakage, determines that the corresponding battery pack is leaking.

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, 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, comprising a vehicle control unit and M carriages, each carriage comprising a battery management controller, a power battery assembly, a first leakage sensor, N second leakage sensors and a plurality of load branches, each of the load branches being connected in parallel at both ends of the power battery assembly, the first leakage sensor being connected to the negative electrode of the corresponding power battery assembly, the power battery assembly comprising N parallel battery packs, the negative electrode of each battery pack being connected to the negative electrode of the power battery assembly through a negative electrode switch, the N second leakage sensors being connected one-to-one with the negative electrodes of the N battery packs, and M and N being positive integers; wherein the battery management controller is used to: when the power battery assembly is in a high-voltage power-on state, send a first request leakage to the first leakage sensor A detection instruction is sent, and when a leakage alarm signal is received from the first leakage sensor within the first preset time after sending the first request leakage detection instruction, all the negative pole switches are controlled to be disconnected, and the connection between the multiple load branches and the positive pole of the power battery assembly is controlled to be disconnected; a second request leakage detection instruction is sent to the first leakage sensor and N second leakage sensors respectively, and when a leakage alarm signal is received from the first leakage sensor within the first preset time after sending the second request leakage detection instruction, a load leakage signal is sent to the vehicle control unit; and when a leakage alarm signal is received from any of the second leakage sensors within the first preset time after sending the second request leakage detection instruction, a leakage signal of the corresponding battery pack is sent to the vehicle control unit.

[0006] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a leakage detection and positioning method for a vehicle, wherein the vehicle includes a vehicle control unit and M carriages, each carriage includes a power battery assembly, a first leakage sensor, N second leakage sensors and multiple load branches, each of the load branches is connected in parallel at both ends of the power battery assembly, the first leakage sensor is connected to the negative electrode of the corresponding power battery assembly, the power battery assembly includes N parallel battery packs, the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through a negative electrode switch, the N second leakage sensors are connected to the negative electrodes of the N battery packs in a one-to-one correspondence, and M and N are both positive integers; wherein the method includes: when the power battery assembly is in a high-voltage power-on state, sending a first request leakage to the first leakage sensor A detection instruction is sent, and when a leakage alarm signal is received from the first leakage sensor within the first preset time after sending the first request leakage detection instruction, all the negative pole switches are controlled to be disconnected, and the connection between the multiple load branches and the positive pole of the power battery assembly is controlled to be disconnected; a second request leakage detection instruction is sent to the first leakage sensor and N second leakage sensors respectively, and when a leakage alarm signal is received from the first leakage sensor within the first preset time after sending the second request leakage detection instruction, a load leakage signal is sent to the vehicle control unit; and when a leakage alarm signal is received from any of the second leakage sensors within the first preset time after sending the second request leakage detection instruction, a leakage signal of the corresponding battery pack is sent to the vehicle control unit.

[0007] The vehicle and leakage detection and positioning method thereof of the embodiment of the present invention can send a first request leakage detection instruction to the first leakage sensor when the battery management controller detects that the power battery assembly is in high voltage power-on, so as to realize leakage detection when the vehicle is powered on at high voltage. Moreover, when leakage is detected, since the first leakage sensor corresponds to the car, the car where leakage occurs can be determined according to the first leakage sensor that detects leakage, and at the same time, the battery management controller can control all the negative pole switches to be disconnected, control the connection between the multiple load branches and the positive pole of the power battery assembly to be disconnected, and then send a second request leakage detection instruction to the first leakage sensor and N second leakage sensors respectively, so as to realize further detection of the car where leakage occurs. After sending the second request leakage instruction, if the battery management controller receives the leakage alarm signal sent by the first leakage sensor within the first preset time, it sends the load leakage signal to the vehicle control unit, and if it receives the leakage alarm signal sent by any second leakage sensor within the first preset time after sending the second request leakage detection instruction, it sends the leakage signal of the corresponding battery pack to the vehicle control unit. In this way, the specific leakage location in the compartment where the leakage occurs can be determined.

[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] 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 1 As shown, the vehicle 10 includes a vehicle control unit 300 and M carriages 100, each carriage 100 includes a battery management controller 200, a power battery assembly 101, a first leakage sensor 105, N second leakage sensors 103 and multiple load branches, each load branch is connected in parallel at both ends of the power battery assembly 101, the first leakage sensor 105 is connected to the negative electrode of the corresponding power battery assembly 101, the power battery assembly 101 includes N parallel battery packs 104, the negative electrode of each battery pack 104 is connected to the negative electrode of the power battery assembly 101 through a negative electrode switch K-, the N second leakage sensors 103 are connected one-to-one with the negative electrodes of the N battery packs 104, and M and N are both positive integers. Figure 1, which is a specific embodiment in which both M and N are greater than 1. The battery management controller 200 is used to: when the power battery assembly 101 is in a high-voltage power-on state, send a first request leakage detection instruction to the first leakage sensor 105, and when receiving a leakage alarm signal sent by the first leakage sensor 105 within a first preset time after sending the first request leakage detection instruction, control all negative pole switches K- to be disconnected, and control the connection between multiple load branches and the positive pole of the power battery assembly 101 to be disconnected; send a second request leakage detection instruction to the first leakage sensor 105 and N second leakage sensors 103 respectively, and when receiving a leakage alarm signal sent by the first leakage sensor 105 within a first preset time after sending the second request leakage detection instruction, send a load leakage signal to the vehicle control unit 300, and when receiving a leakage alarm signal sent by any second leakage sensor 103 within a first preset time after sending the second request leakage detection instruction, send a leakage signal of the corresponding battery pack 104 to the vehicle control unit 300.

[0016] 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, and the like.

[0017] The load 102 can be started after receiving the high-voltage power-on command sent by the vehicle control unit 300, and then send a high-voltage power-on success signal to the vehicle control unit 300; and unloaded after receiving the high-voltage system leakage alarm sent by the vehicle control unit 300, and send unloading completion information to the vehicle control unit 300. The leakage sensor can start leakage detection when receiving the leakage detection request command sent by the battery management controller 200; and stop leakage detection when receiving the leakage detection stop command sent by the battery management controller 200.

[0018] The communication between the vehicle control unit 300 and the battery management controller 200 and the load 102 may be, for example, network communication; the communication between the battery management controller 200 and the leakage sensor may be, for example, network communication.

[0019] Specifically, in the actual application process, the battery management controller 200 can determine whether the power battery assembly 101 is in a high-voltage power-on state. For example, the battery management controller 200 can determine whether the power battery assembly 101 is in a high-voltage power-on state by delaying the fourth preset time after determining that the operation and maintenance personnel control the high-voltage power-on. For another example, the battery management controller 200 can determine whether the vehicle 10 has completed low-voltage power-on, and after determining that the vehicle 10 has completed low-voltage power-on, delay the fifth preset time to determine that the power battery assembly 101 is in a high-voltage power-on state.

[0020] After the battery management controller 200 determines that the power battery assembly 101 is in a high-voltage power-on state, leakage detection control can be performed on the vehicle 10, and the leakage detection control on the vehicle 10 is to perform leakage detection control on the M carriages 100 in the vehicle 10. The method for performing leakage detection on one carriage 100 includes the following steps:

[0021] A1, when the power battery assembly 101 is in a high-voltage power-on state, a first request leakage detection instruction is sent to the first leakage sensor 105, and when a leakage alarm signal sent by the first leakage sensor 105 is received within a first preset time after sending the first request leakage detection instruction, all negative pole switches K- are controlled to be disconnected, and the connection between multiple load branches and the positive pole of the power battery assembly 101 is controlled to be disconnected.

[0022] Specifically, after determining that the power battery assembly 101 is in a high-voltage power-on state, the battery management controller 200 sends a first request leakage detection instruction to the first leakage sensor 105 to determine whether there is leakage in the current high-voltage circuit. If the battery management controller 200 does not receive a leakage alarm signal sent by the first leakage sensor 105 within the first preset time after sending the first request leakage detection instruction, it can be determined that there is no leakage in the current high-voltage circuit, and then the battery management controller 200 can send a stop leakage detection instruction to the first leakage sensor 105 to stop the first leakage sensor 105 from performing leakage detection. Alternatively, the battery management controller 200 may also send a stop leakage detection instruction to the first leakage sensor 105 when it is determined that there is no leakage to stop the first leakage sensor 105 from leaking, and control the first leakage sensor 105 to perform leakage detection again after the sixth preset time. Alternatively, the battery management controller 200 may not send a stop leakage detection instruction to the first leakage sensor 105 when it is determined that there is no leakage, so that the first leakage sensor 105 continues to perform leakage detection.

[0023] When the battery management controller 200 receives the leakage alarm signal sent by the first leakage sensor 105 within the first preset time after sending the first request leakage detection instruction, it sends a high-voltage leakage signal to the vehicle control unit 300, and the high-voltage leakage signal may include the information of the carriage 100. At the same time, the battery management controller 200 can disconnect all the negative pole switches K- in the current carriage 100, and control the disconnection between multiple load branches and the positive pole of the power battery assembly 101.

[0024] Optionally, upon receiving the leakage alarm signal sent by the first leakage sensor 105 , the battery management controller 200 may also send a leakage detection stop instruction to the first leakage sensor 105 .

[0025] When receiving the high-voltage leakage signal, the vehicle control unit 300 determines that leakage occurs in the corresponding compartment 100, sends a high-voltage system leakage alarm to the load 102 in the compartment 100, and controls the load 102 currently in working state to unload.

[0026] A2, sends a second request leakage detection instruction to the first leakage sensor 105 and N second leakage sensors 103 respectively, and when a leakage alarm signal is received from the first leakage sensor 105 within the first preset time after sending the second request leakage detection instruction, sends a load leakage signal to the vehicle control unit 300, and when a leakage alarm signal is received from any second leakage sensor 103 within the first preset time after sending the second request leakage detection instruction, sends a leakage signal of the corresponding battery pack 104 to the vehicle control unit 300.

[0027] Specifically, after the battery management controller 200 disconnects all the negative pole switches K- in the current carriage 100 and controls the disconnection between multiple load branches and the positive pole of the power battery assembly 101, it sends a second request leakage detection instruction to the first leakage sensor 105 and N second leakage sensors 103 respectively to determine the specific location where the leakage occurs.

[0028] Specifically, after sending the second request leakage detection instruction, if the battery management controller 200 receives a leakage alarm signal sent by the first leakage sensor 105, the battery management controller 200 determines that the load 102 has a leakage, and sends a load leakage signal to the vehicle control unit 300; if the battery management controller 200 receives a leakage alarm signal sent by the second leakage sensor 103, the battery management controller 200 obtains the identity information of the battery pack 104 corresponding to the second leakage sensor 103 that sends the leakage alarm signal, determines that the battery pack 104 is leaking, and sends a leakage signal corresponding to the battery pack 104 to the vehicle control unit 300.

[0029] It should be noted that, when the battery management controller 200 receives the leakage alarm signal sent by the first leakage sensor 105 within the first preset time after sending the second request leakage detection instruction, it is also used to: end the high-voltage power-on process.

[0030] Thus, leakage detection can be performed when the vehicle 10 is powered on at high voltage, and when leakage is detected in a certain compartment 100, all negative pole switches K- of the compartment 100 are controlled to be disconnected, and the connection between multiple load branches and the positive pole of the power battery assembly 101 is controlled to be disconnected; and then the second request leakage detection instruction is sent to the first leakage sensor 105 and N second leakage sensors 103 respectively, and when the leakage alarm signal sent by the first leakage sensor 105 is received within the first preset time after the second request leakage detection instruction is sent, the load leakage signal is sent to the vehicle control unit 300, and when the leakage alarm signal sent by any second leakage sensor 103 is received within the first preset time after the second request leakage detection instruction is sent, the leakage signal of the corresponding battery pack 104 is sent to the vehicle control unit 300. Thus, when it is determined that leakage occurs in a certain compartment 100, the specific leakage position in the compartment 100 can be determined.

[0031] Further, after receiving the leakage signal, the vehicle control unit 300 determines the type of the leakage signal received. If the received signal is a load leakage signal, the process ends. If the received signal is a leakage signal corresponding to the battery pack 104, it can be determined whether all N battery packs 104 have leakage.

[0032] Specifically, if the vehicle control unit 300 receives leakage signals of N battery packs 104 within the second preset time after receiving the high-voltage leakage signal, it can be determined that all N battery packs 104 are leaking, and the vehicle control unit 300 can send an instruction to end the high-voltage power-on process to the battery management controller 200, and the battery management controller 200 ends the high-voltage power-on process. Alternatively, the vehicle control unit 300 can also send a leakage alarm of all battery packs 104 to the operation and maintenance personnel so that the operation and maintenance personnel can give instructions accordingly.

[0033] If the vehicle control unit 300 does not receive leakage signals of N battery packs 104 within the second preset time after receiving the high-voltage leakage signal, it is determined that there is a non-leaking battery pack 104. The vehicle control unit 300 sends a high-voltage power-on instruction to the battery management controller 200, and the second preset time is greater than the first preset time.

[0034] For example, the vehicle control unit 300 may have a built-in program to determine the number of battery packs 104 with leakage after receiving leakage information from the corresponding sensor, and then send a high-voltage power-on command to the battery management controller 200 when the number of battery packs 104 with leakage is not N.

[0035] For another example, after receiving the leakage information from the corresponding sensor, the vehicle control unit 300 can display the leakage condition of the battery pack 104 to the operation and maintenance personnel, and then determine whether the high-voltage power-on instruction issued by the operation and maintenance personnel has been received, and send the high-voltage power-on instruction to the battery management controller 200 after determining that it has been received.

[0036] For another example, the vehicle control unit 300 can determine whether the leakage signal of the corresponding battery pack 104 is received in a preset order, and then determine whether to send a high-voltage power-on instruction according to the determination result. As an example, assuming that the power battery assembly 101 includes two battery packs 104, respectively recorded as battery pack 1 and battery pack 2, that is, N is 2, then the vehicle control unit 300 can first determine whether the leakage signal of the corresponding battery pack 1 is received. If not, it is determined that battery pack 1 is not leaking, and leakage signals of N battery packs 104 are not received, and it is determined to send a high-voltage power-on instruction; if received, it is determined whether the leakage signal of the corresponding battery pack 2 is received. If not, it is determined that battery pack 2 is not leaking, and leakage signals of N battery packs 104 are not received, and it is determined to send a high-voltage power-on instruction; if received, it is determined that leakage signals of N battery packs 104 are received within the second preset time after the low-voltage power-on success signal is sent, and an alarm signal can be sent.

[0037] After receiving the leakage alarm signal sent by the second leakage sensor 103, the battery management controller 200 can also determine whether there is a battery pack 104 without leakage based on the leakage alarm signal sent by the second leakage sensor 103; if so, when receiving the high-voltage power-on command sent by the vehicle control unit 300, it controls the high-voltage power-on of the battery pack 104 without leakage.

[0038] Optionally, when the battery management controller 200 receives the high-voltage power-on command sent by the vehicle control unit 300, it sends a stop leakage detection command to the first leakage sensor 105 to stop leakage detection; and after the high-voltage power-on of the battery pack 104 without leakage is successfully performed, it sends a high-voltage power-on success signal to the vehicle control unit 300.

[0039] Thus, when there is a non-leaking battery pack 104 in the compartment 100 where leakage occurs, the non-leaking battery pack 104 can be controlled to be powered up with high voltage, so that the vehicle 10 can be put into use quickly and efficiency can be improved.

[0040] In one embodiment of the present invention, the positive terminal of each load branch is connected to the positive electrode of the power battery assembly 101 through a discharge positive electrode contactor, and multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor. The motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor. The DC-DC converter is connected in series with the DC contactor. When the battery control manager controls the connection between multiple load branches and the positive electrode of the power battery assembly 101 to be disconnected, it is specifically used to: control the discharge positive electrode contactor, the main contactor, and the DC contactor to be disconnected. Among them, Figure 2 This is also a specific embodiment in which both M and N are greater than 1.

[0041] Specifically, when the battery management controller 200 sends a first request leakage detection instruction to the first leakage sensor 105 and receives a leakage alarm signal sent by the first leakage sensor 105, it can control all negative pole switches K-, discharge positive pole contactors, main contactors, and DC contactors to be disconnected, and then send a second request leakage detection instruction to the first leakage sensor 105 and N second leakage sensors 103.

[0042] In one embodiment of the present invention, the motor controller branch further includes a first pre-charging circuit, the first pre-charging circuit is connected in parallel with the main contactor, and the DC-DC converter branch further includes a second pre-charging circuit, 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 further includes a main pre-charging contactor connected in series with the pre-charging resistor, and the second pre-charging circuit further includes a DC pre-charging contactor connected in series with the pre-charging resistor.

[0043] Among them, when controlling the high voltage power-on of the battery pack 104 without leakage, the battery control manager is specifically used to: control the negative switch K- corresponding to the battery pack 104 without leakage to close, and control the discharge positive contactor, the first pre-charging circuit, and the second pre-charging circuit to close; after delaying the third preset time, control the main contactor and the DC contactor to close, and control the first pre-charging circuit and the second pre-charging circuit to disconnect. When controlling the first pre-charging circuit and the second pre-charging circuit to close, the battery management controller 200 is specifically used to: the battery management controller 200 controls the main pre-charging contactor and the DC pre-charging contactor to close.

[0044] As an example, see Figure 2, including a DC charger assembly 400, a maintenance switch assembly 500 including a discharge 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 path, a DC contactor K3, a DC pre-charging contactor K4 on the second pre-charging path, 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 M1, a DC charger assembly 400 and .... The box assemblies 600 are connected via a charging connection device; the power battery assembly 101 supplies power to the load 102 via the high-voltage distribution box assembly 600; the second leakage sensor 103 is installed between the negative electrode of the battery pack 104 and the high-voltage distribution box shell; the first leakage sensor 105 is installed between the negative electrode of the power battery assembly 101 and the high-voltage distribution box shell; the high-voltage distribution box shell and the vehicle body have the same potential; the above leakage sensor can detect the insulation resistance between the high-voltage circuit in which it is located and the shell; when the insulation resistance is less than a preset resistance threshold, it is determined that leakage information is detected; the number of motor controllers is the same as that of motor M1, and both are at least 1. The above power battery assembly 101 is as follows Figure 3 As shown, it includes two battery packs 104, denoted as battery pack 1 and battery pack 2, and also includes positive switches: KM1 and KM2, and two negative switches K-: KM3 and KM4, and fuses: FU1 and FU2, and current sensors LH1 and LH2; the battery management controller 200 can control the opening and closing of the positive switch and the negative switch K-. Specifically, when the battery control manager controls the high voltage power-on of the battery pack 104 without leakage, it first controls the positive switch and the negative switch K- corresponding to the battery pack 104 without leakage to close, and controls the main pre-charging contactor K2 and the DC pre-charging contactor K4 to close; after the fourth preset time is delayed, the main contactor K1 and the DC contactor K3 are controlled to close, and the main pre-charging contactor K2 and the DC pre-charging contactor K4 are controlled to open.

[0045] Among them, when controlling the high voltage power-up of the battery pack 104 without leakage, the battery control manager is specifically used to: control the closing of the negative pole switch K- corresponding to the battery pack 104 without leakage, and control the closing of the discharge positive pole contactor, the main pre-charging contactor K2, and the DC pre-charging contactor K4; after delaying for a third preset time, control the closing of the main contactor and the DC contactor, and control the disconnection of the main pre-charging contactor K2 and the DC pre-charging contactor K4.

[0046] Optionally, when the battery management controller 200 sends a first request leakage detection instruction to the first leakage sensor 105 and receives a leakage alarm signal sent by the first leakage sensor 105, it can control the positive pole switches: KM1, KM2, and two negative pole switches K-: KM3, KM4 to be disconnected, and control the discharge positive pole contactor KM7, the main contactor K1, and the DC contactor K3 to be disconnected, and then send a second request leakage detection instruction to the first leakage sensor 105 and N second leakage sensors 103.

[0047] In summary, the vehicle of the embodiment of the present invention can send a first request leakage detection instruction to the first leakage sensor when the battery management controller detects that the power battery assembly is in high voltage power-on, so as to realize leakage detection when the vehicle is powered on at high voltage. Moreover, when leakage is detected, since the first leakage sensor corresponds to the car, the car where leakage occurs can be determined according to the first leakage sensor that detects leakage, and at the same time, the battery management controller can control all the negative pole switches to be disconnected, control the connection between the multiple load branches and the positive pole of the power battery assembly to be disconnected, and then send a second request leakage detection instruction to the first leakage sensor and N second leakage sensors respectively, so as to realize further detection of the car where leakage occurs. After sending the second request leakage instruction, if the battery management controller receives the leakage alarm signal sent by the first leakage sensor within the first preset time, it sends the load leakage signal to the vehicle control unit, and if it receives the leakage alarm signal sent by any second leakage sensor within the first preset time after sending the second request leakage detection instruction, it sends the leakage signal of the corresponding battery pack to the vehicle control unit. In this way, the specific leakage location in the compartment where the leakage occurs can be determined.

[0048] Figure 4 The present invention is a flowchart of a method for detecting leakage of a vehicle according to an embodiment of the present invention.

[0049] In an embodiment of the present invention, a vehicle includes a vehicle control unit and M carriages, each carriage includes a power battery assembly, a first leakage sensor, N second leakage sensors and multiple load branches, each load branch is connected in parallel at both ends of the power battery assembly, the first leakage sensor is connected to the negative electrode of the corresponding power battery assembly, the power battery assembly includes N parallel battery packs, the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through a negative electrode switch, the N second leakage sensors are connected to the negative electrodes of the N battery packs in a one-to-one correspondence, and M and N are both positive integers.

[0050] like Figure 4 As shown, the vehicle leakage detection method includes:

[0051] S11, when the power battery assembly is in a high-voltage power-on state, a first request leakage detection instruction is sent to the first leakage sensor, and when a leakage alarm signal sent by the first leakage sensor is received within a first preset time after sending the first request leakage detection instruction, all negative pole switches are controlled to be disconnected, and the connection between multiple load branches and the positive pole of the power battery assembly is controlled to be disconnected.

[0052] S12, respectively sends a second request leakage detection instruction to the first leakage sensor and N second leakage sensors, and when a leakage alarm signal is received from the first leakage sensor within the first preset time after sending the second request leakage detection instruction, sends a load leakage signal to the vehicle control unit, and when a leakage alarm signal is received from any second leakage sensor within the first preset time after sending the second request leakage detection instruction, sends a leakage signal of the corresponding battery pack to the vehicle control unit.

[0053] In one embodiment of the present invention, the leakage detection and positioning method of a vehicle also includes: when a leakage alarm signal sent by a first leakage sensor is received within a first preset time after sending a first request leakage detection instruction, a high-voltage leakage signal is sent to the vehicle control unit; according to the leakage alarm signal sent by the second leakage sensor, it is determined whether there is a battery pack without leakage, and if so, when a high-voltage power-on instruction sent by the vehicle control unit is received, the battery pack without leakage is controlled to be powered on at high voltage, wherein the high-voltage power-on instruction is sent by the vehicle control unit to the battery management controller when no leakage signals of N battery packs are received within a second preset time after receiving the high-voltage leakage signal, and the second preset time is greater than the first preset time.

[0054] In one embodiment of the present invention, the positive terminal of each load branch is connected to the positive electrode of the power battery assembly through a discharge positive contactor, and the multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor. The motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor. The DC-DC converter is connected in series with the DC contactor. Controlling the connection between the multiple load branches and the positive electrode of the power battery assembly includes: controlling the discharge positive contactor, the main contactor, and the DC contactor to be disconnected.

[0055] In one embodiment of the present invention, the motor controller branch also includes a first pre-charging circuit, which is connected in parallel with the main contactor, and the DC-DC converter branch also includes a second pre-charging circuit, which is connected in parallel with the DC contactor, wherein the high voltage power-on of the battery pack without leakage is controlled, specifically including: controlling the negative pole switch corresponding to the battery pack without leakage to close, and controlling the discharge positive pole contactor, the first pre-charging circuit, and the second pre-charging circuit to close; after a delay of a third preset time, controlling the main contactor and the DC contactor to close, and controlling the first pre-charging circuit and the second pre-charging circuit to disconnect.

[0056] 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.

[0057] The leakage detection and positioning method of the vehicle of the embodiment of the present invention can send a first request leakage detection instruction to the first leakage sensor when the battery management controller detects that the power battery assembly is in high voltage power-on, so as to realize leakage detection when the vehicle is powered on at high voltage. Moreover, when leakage is detected, since the first leakage sensor corresponds to the car, the car where leakage occurs can be determined according to the first leakage sensor that detects leakage, and at the same time, the battery management controller can control all the negative pole switches to be disconnected, control the connection between the multiple load branches and the positive pole of the power battery assembly to be disconnected, and then send a second request leakage detection instruction to the first leakage sensor and N second leakage sensors respectively, so as to realize further detection of the car where leakage occurs. After sending the second request leakage instruction, if the battery management controller receives the leakage alarm signal sent by the first leakage sensor within the first preset time, it sends the load leakage signal to the vehicle control unit, and if it receives the leakage alarm signal sent by any second leakage sensor within the first preset time after sending the second request leakage detection instruction, it sends the leakage signal of the corresponding battery pack to the vehicle control unit. In this way, the specific leakage location in the compartment where the leakage occurs can be determined.

[0058] 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 equipment (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 equipment and execute instructions), or in combination with these instruction execution systems, devices or equipment. For the purpose 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 equipment, or in combination with these instruction execution systems, devices or equipment. 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 and M carriages, each carriage includes a battery management controller, a power battery assembly, a first leakage sensor, N second leakage sensors and multiple load branches, each of the load branches is connected in parallel to both ends of the power battery assembly, the first leakage sensor is connected to the negative electrode of the corresponding power battery assembly, the power battery assembly includes N parallel battery packs, the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through a negative electrode switch, N second leakage sensors are connected to the negative electrodes of the N battery packs in a one-to-one correspondence, and M and N are both positive integers; wherein the battery management controller is used to: When the power battery assembly is in a high-voltage power-on state, a first leakage detection request instruction is sent to the first leakage sensor, and when a leakage alarm signal sent by the first leakage sensor is received within a first preset time after sending the first leakage detection request instruction, all the negative pole switches are controlled to be disconnected, and the connection between the plurality of load branches and the positive pole of the power battery assembly is controlled to be disconnected; A second request leakage detection instruction is sent to the first leakage sensor and N second leakage sensors respectively, and when a leakage alarm signal is received from the first leakage sensor within a first preset time after sending the second request leakage detection instruction, a load leakage signal is sent to the vehicle control unit; and when a leakage alarm signal is received from any of the second leakage sensors within the first preset time after sending the second request leakage detection instruction, a leakage signal of the corresponding battery pack is sent to the vehicle control unit.

2. The vehicle according to claim 1, characterized in that The battery management controller is also used for: Determining whether there is a battery pack without leakage according to the leakage alarm signal sent by the second leakage sensor; If it exists, then when the high-voltage power-on command sent by the vehicle control unit is received, the high-voltage power-on of the battery pack that is not leaking is controlled, wherein the high-voltage power-on command is sent to the battery management controller by the vehicle control unit when no leakage signals of N battery packs are received within the second preset time after receiving the leakage alarm signal, and the second preset time is greater than the first preset time.

3. The vehicle according to claim 2, characterized in that When the battery management controller receives a leakage alarm signal sent by the first leakage sensor within a first preset time after sending the second leakage detection request instruction, the battery management controller is further used to: End the high voltage power-on process.

4. The vehicle according to claim 2 or 3, characterized in that: The positive terminal of each load branch is connected to the positive electrode of the power battery assembly through a discharge positive electrode contactor, and the multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor. The motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor. The DC-DC converter is connected in series with the DC contactor. When the battery management controller controls the connection between the multiple load branches and the positive electrode of the power battery assembly to be disconnected, it is specifically used to: The discharge positive contactor, the main contactor, and the DC contactor are controlled to be disconnected.

5. The vehicle according to claim 4, characterized in that The motor controller branch further includes a first pre-charging circuit, which is connected in parallel with the main contactor, and the DC-DC converter branch further includes a second pre-charging circuit, which is connected in parallel with the DC contactor, wherein the battery management controller is specifically used to control the high voltage power-on of the battery pack without leakage when: Controlling the negative electrode switch corresponding to the battery pack without leakage to close, and controlling the discharge positive electrode contactor, the first pre-charging circuit, and the second pre-charging circuit to close; After a delay of a third preset time, the main contactor and the DC contactor are controlled to be closed, and the first pre-charging circuit and the second pre-charging circuit are controlled to be disconnected.

6. The vehicle 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 is specifically used to control the first pre-charging circuit and the second pre-charging circuit to be closed when: The battery management controller controls the main pre-charging contactor and the DC pre-charging contactor to close.

7. A method for detecting and locating leakage of a vehicle, characterized in that: The vehicle includes a vehicle control unit and M carriages, each carriage includes a battery management controller, a power battery assembly, a first leakage sensor, N second leakage sensors and multiple load branches, each of the load branches is connected in parallel to both ends of the power battery assembly, the first leakage sensor is connected to the negative electrode of the corresponding power battery assembly, the power battery assembly includes N parallel battery packs, the negative electrode of each battery pack is connected to the negative electrode of the power battery assembly through a negative electrode switch, the N second leakage sensors are connected to the negative electrodes of the N battery packs in a one-to-one correspondence, and M and N are both positive integers; wherein the method includes: When the power battery assembly is in a high-voltage power-on state, a first leakage detection request instruction is sent to the first leakage sensor, and when a leakage alarm signal sent by the first leakage sensor is received within a first preset time after sending the first leakage detection request instruction, all the negative pole switches are controlled to be disconnected, and the connection between the plurality of load branches and the positive pole of the power battery assembly is controlled to be disconnected; A second request leakage detection instruction is sent to the first leakage sensor and N second leakage sensors respectively, and when a leakage alarm signal is received from the first leakage sensor within a first preset time after sending the second request leakage detection instruction, a load leakage signal is sent to the vehicle control unit; and when a leakage alarm signal is received from any of the second leakage sensors within the first preset time after sending the second request leakage detection instruction, a leakage signal of the corresponding battery pack is sent to the vehicle control unit.

8. The vehicle leakage detection and positioning method according to claim 7, characterized in that: The method further comprises: Determining whether there is a battery pack without leakage according to the leakage alarm signal sent by the second leakage sensor; If it exists, then when the high-voltage power-on command sent by the vehicle control unit is received, the high-voltage power-on of the battery pack that is not leaking is controlled, wherein the high-voltage power-on command is sent to the battery management controller by the vehicle control unit when no leakage signals of N battery packs are received within the second preset time after receiving the leakage alarm signal, and the second preset time is greater than the first preset time.

9. The vehicle leakage detection and positioning method according to claim 8, characterized in that: The positive terminal of each load branch is connected to the positive electrode of the power battery assembly through a discharge positive electrode contactor, and the multiple load branches include a motor controller branch and a DC-DC converter branch. The motor controller branch includes a motor controller and a main contactor. The motor controller is connected in series with the main contactor. The DC-DC converter branch includes a DC-DC converter and a DC contactor. The DC-DC converter is connected in series with the DC contactor. The control of disconnecting the connection between the multiple load branches and the positive electrode of the power battery assembly includes: The discharge positive contactor, the main contactor, and the DC contactor are controlled to be disconnected.

10. The vehicle leakage detection and positioning method according to claim 9, characterized in that: The motor controller branch further includes a first pre-charging circuit, which is connected in parallel with the main contactor, and the DC-DC converter branch further includes a second pre-charging circuit, which is connected in parallel with the DC contactor, wherein controlling the high voltage power-on of the battery pack without leakage specifically includes: Controlling the negative electrode switch corresponding to the battery pack without leakage to close, and controlling the discharge positive electrode contactor, the first pre-charging circuit, and the second pre-charging circuit to close; After a delay of a third preset time, the main contactor and the DC contactor are controlled to be closed, and the first pre-charging circuit and the second pre-charging circuit are controlled to be disconnected.

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