A battery high-voltage system fault diagnosis method and device, a terminal and a storage medium

Abstract

The application discloses a kind of battery high pressure system fault diagnosis method, device, terminal and storage medium, belong to power battery fault diagnosis technical field, comprising: respectively obtaining power battery voltage related data, high voltage relay voltage related data and high voltage relay driving state;High voltage system fault diagnosis mode is determined by high voltage relay driving state;Whether fault occurs is diagnosed by power battery voltage related data, high voltage relay voltage related data and high voltage system fault diagnosis mode, if yes, then exit diagnosis and save fault state.By the sampling line state monitoring of high voltage detection device, avoid the missing of high voltage system and its component fault diagnosis caused by high voltage detection fault, improve the reliability of inside and outside high voltage connection state judgment of power battery by power battery high voltage connection state monitoring, by high voltage relay contact state monitoring, while ensuring the reliability of diagnosis, reduce diagnosis time.

Description

TECHNICAL FIELD

[0001] The application discloses a battery high-voltage system fault diagnosis method and device, a terminal and a storage medium, and belongs to the technical field of power battery fault diagnosis. BACKGROUND

[0002] As the market demand for electric vehicles gradually expands, the requirement for high-voltage system safety monitoring function also increases. The high-voltage system safety monitoring function mainly includes high-voltage loop connection state monitoring, high-voltage system insulation state monitoring and high-voltage component state monitoring. The high-voltage monitoring and diagnosis mode is usually determined by sampling the voltage values on the battery side and the high-voltage load side, so it can be seen that reliable high-voltage detection has a great influence on high-voltage system safety monitoring.

[0003] The high-voltage system fault of an electric vehicle will affect the driving safety of the vehicle. If the high-voltage load loop is accidentally disconnected during driving, it may cause serious consequences such as vehicle collision. If the connection between the battery modules is disconnected, and the BMS does not detect it in time, a large contact resistance will be generated, causing burning at the loose part, and in severe cases, it may cause the battery cell to catch fire, causing serious harm. SUMMARY

[0004] The purpose of the present application is to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] According to a first aspect of an embodiment of the present application, a battery high-voltage system fault diagnosis method is provided, comprising:

[0007] acquiring power battery voltage related data, high-voltage relay voltage related data and high-voltage relay driving state, respectively, wherein the high-voltage relay includes a positive relay, a negative relay, a pre-charging relay, a charging positive relay and a charging negative relay;

[0008] determining a high-voltage system fault diagnosis mode through the high-voltage relay driving state, wherein the high-voltage system fault diagnosis mode includes sampling line state monitoring of a high-voltage detection device, power battery high-voltage connection state monitoring and high-voltage relay contact state monitoring;

[0009] diagnosing whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode, and if so, exiting the diagnosis and saving the fault state.

[0010] Preferably, the power battery voltage related data comprises: a battery monomer voltage sum value Vsum, a power battery side high voltage line voltage Vb, and a battery high voltage line current Ib; the high voltage relay voltage related data comprises: a positive electrode relay load side voltage Vlp, a negative electrode relay load side voltage Vln, a motor controller detected high voltage line voltage Vm, a charging positive electrode relay load side voltage Vcp, and a charging negative electrode relay load side voltage Vcn; the high voltage detection device sampling line state monitoring comprises: driving mode high voltage detection device sampling line state monitoring and direct current charging mode high voltage detection device sampling line state monitoring; the power battery high voltage connection state monitoring comprises: battery inner side high voltage connection state monitoring and battery outer side high voltage connection state monitoring; and the high voltage relay contact state monitoring comprises: charging relay contact state monitoring and positive and negative electrode relay contact state monitoring.

[0011] Preferably, the high voltage system fault diagnosis mode determined by the high voltage relay driving state comprises:

[0012] When the high voltage relay driving state is a positive electrode relay and a negative electrode relay both closed state and a pre-charging relay open state, the power battery high voltage connection state monitoring is battery outer side high voltage connection state monitoring.

[0013] When the high voltage relay driving state is a charging positive electrode relay, a charging negative electrode relay and a negative electrode relay both closed state, the high voltage detection device sampling line state monitoring is direct current charging mode high voltage detection device sampling line state monitoring.

[0014] When the high voltage relay driving state is a positive electrode relay and a negative electrode relay both open state and a pre-charging relay open state, the power battery high voltage connection state monitoring is battery inner side high voltage connection state monitoring.

[0015] When the high voltage relay open state, the high voltage relay contact state monitoring is positive and negative electrode relay contact state monitoring.

[0016] When the positive electrode relay and the negative electrode relay are both closed state and the charging positive electrode relay and the charging negative electrode relay are open state, the high voltage relay contact state monitoring is charging relay contact state monitoring.

[0017] Preferably, the diagnosis of whether a fault occurs by the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode comprises:

[0018] When the high voltage system fault diagnosis mode is power battery high voltage connection state monitoring, the method comprises the following steps:

[0019] The battery outside high-voltage connection state monitoring is executed, and the specific content is as follows:

[0020] The absolute value Vf1 of the difference between the power battery side high-voltage line voltage Vb and the battery monomer voltage sum value Vsum, the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum, the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum, and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively acquired;

[0021] When the absolute value of the difference between the power battery side high-voltage line voltage Vb and the battery monomer voltage sum value Vsum is less than the monomer voltage sampling error value V1, the specific judgment is as follows:

[0022] Whether the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected is judged:

[0023] Yes, the open circuit fault of the high-voltage load side is detected;

[0024] No, the next step is executed;

[0025] Whether the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected is judged:

[0026] Yes, the open circuit fault of the negative electrode relay is detected;

[0027] No, the next step is executed;

[0028] Whether the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected is judged:

[0029] Yes, the open circuit fault of the positive electrode relay is detected;

[0030] No, the next step is executed;

[0031] The battery inside high-voltage connection state monitoring or the sampling line state monitoring of the direct current charging mode high-voltage detection device is executed, and the specific content of the battery inside high-voltage connection state monitoring is as follows:

[0032] determining whether the absolute value Vf1 of the difference between the high-voltage line voltage Vb on the side of the power battery and the sum value Vsum of the battery cell voltages is less than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0033] Yes, the abnormal state of the high-voltage connection on the side of the power battery is detected.

[0034] No, the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage relay driving state are repeatedly obtained.

[0035] Preferably, the diagnosis of whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage system fault diagnosis mode includes:

[0036] When the high-voltage system fault diagnosis mode is the sampling line state monitoring of the driving mode high-voltage detection device, the following steps are included:

[0037] determining whether the sum value Vsum of the battery cell voltages is greater than the voltage limit threshold V0:

[0038] Yes, the next step is performed.

[0039] No, the sampling line state monitoring of the driving mode high-voltage detection device is ended.

[0040] determining whether the absolute value of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum value Vsum of the battery cell voltages is less than the single cell voltage sampling error value V1:

[0041] Yes, the next step is performed.

[0042] No, the sampling line state monitoring of the driving mode high-voltage detection device is ended.

[0043] determining whether the absolute value of the difference between the sum value Vsum of the battery cell voltages and the high-voltage line voltage Vb on the side of the power battery is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0044] Yes, the high-voltage sampling line connection state S0 of the bus voltage on the side of the power battery is abnormal.

[0045] No, the next step is performed.

[0046] determining whether the absolute value of the difference between the sum value Vsum of the battery cell voltages and the voltage Vlp on the side of the positive electrode relay load is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0047] Yes, the high-voltage sampling line connection state S1 on the side of the positive electrode relay load is abnormal.

[0048] No, the next step is performed.

[0049] whether the absolute value of the difference between the battery cell voltage sum value Vsum and the negative electrode relay load side voltage Vln is greater than the voltage sampling value V2 when the high voltage sampling line is disconnected:

[0050] Yes, the high voltage sampling line connection state S2 of the negative electrode relay load side is abnormal;

[0051] No, repeat the acquisition of the power battery voltage related data, the high voltage relay voltage related data and the high voltage relay driving state respectively.

[0052] Preferably, the diagnosis of whether a fault occurs through the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode includes:

[0053] When the high voltage system fault diagnosis mode is the sampling line state monitoring of the direct current charging mode high voltage detection device, the following steps are included:

[0054] whether the battery cell voltage sum value Vsum is greater than the voltage limit threshold value V0:

[0055] Yes, execute the next step;

[0056] No, end the sampling line state monitoring of the direct current charging mode high voltage detection device;

[0057] whether the battery high voltage line current Ib is less than the stable charging current value I1:

[0058] Yes, execute the next step;

[0059] No, end the sampling line state monitoring of the direct current charging mode high voltage detection device;

[0060] acquire the absolute value of the difference between the battery cell voltage sum value Vsum and the charging positive electrode relay load side voltage Vcp and determine whether it is greater than the voltage sampling value V2 when the high voltage sampling line is disconnected:

[0061] Yes, the high voltage sampling line connection state S3 of the charging positive electrode relay load side is abnormal;

[0062] No, execute the next step;

[0063] acquire the absolute value of the difference between the battery cell voltage sum value Vsum and the charging negative electrode relay load side voltage Vcn and determine whether it is greater than the voltage sampling value V2 when the high voltage sampling line is disconnected:

[0064] Yes, the high voltage sampling line connection state S4 of the charging negative electrode relay load side is abnormal;

[0065] No, repeat the acquisition of the power battery voltage related data, the high voltage relay voltage related data and the high voltage relay driving state respectively.

[0066] Preferably, the diagnosing whether a fault occurs by the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode diagnosis mode comprises:

[0067] The high voltage system fault diagnosis mode is the charging relay contact state monitoring, comprising the following steps:

[0068] The high voltage system fault diagnosis mode is the high voltage relay contact state monitoring, comprising the following steps:

[0069] The positive and negative electrode relay contact state monitoring is executed, and the specific content is as follows:

[0070] It is judged whether the absolute value of the difference between the battery monomer voltage sum value Vsum and the high voltage line voltage Vb on the power battery side is less than the monomer voltage sampling error value V1:

[0071] Yes, the next step is executed;

[0072] No, the positive and negative electrode relay contact state monitoring is ended;

[0073] After the time delay t0, the time delay positive electrode relay load side voltage Vlp' and the time delay negative electrode relay load side voltage Vln' are collected, and the t0 is 3-10 times of the high voltage sampling period;

[0074] The absolute value of the difference between the positive electrode relay load side voltage Vlp and the time delay positive electrode relay load side voltage Vlp' and the absolute value of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum are obtained, and it is judged whether the absolute value is less than the monomer voltage sampling error value V1:

[0075] Yes, the positive electrode relay contact sticking fault is detected;

[0076] No, the next step is executed;

[0077] The absolute value of the difference between the negative electrode relay load side voltage Vln and the time delay negative electrode relay load side voltage Vln' and the absolute value of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum are obtained, and it is judged whether the absolute value is less than the monomer voltage sampling error value V1:

[0078] Yes, the negative electrode relay contact sticking fault is detected;

[0079] No, the next step is executed;

[0080] The charging relay contact state monitoring is executed, and the specific content is as follows:

[0081] determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the high-voltage line voltage Vb of the power battery side is less than the cell voltage sampling error value V1:

[0082] Yes, proceed to the next step.

[0083] No, end the charging relay contact state monitoring.

[0084] After the delay t0, collect the delay charging positive electrode relay load side voltage Vcp' and the delay charging negative electrode relay load side voltage Vcn';

[0085] Determine whether the absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the delay charging positive electrode relay load side voltage Vcp' and the absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the battery cell voltage sum value Vsum are less than the cell voltage sampling error value V1, respectively.

[0086] Yes, a charging positive electrode relay contact sticking fault is detected.

[0087] No, proceed to the next step.

[0088] Determine whether the absolute value of the difference between the charging negative electrode relay load side voltage Vcn and the delay charging positive electrode relay load side voltage Vcn' and the absolute value of the difference between the charging negative electrode relay load side voltage Vcn and the battery cell voltage sum value Vsum are less than the cell voltage sampling error value V1, respectively.

[0089] Yes, a charging negative electrode relay contact sticking fault is detected.

[0090] No, repeat the steps of respectively acquiring the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage relay driving state.

[0091] According to a second aspect of the embodiments of the present application, a power battery high-voltage system fault diagnosis device for an electric vehicle is provided, comprising:

[0092] An acquisition module is configured to respectively acquire power battery voltage related data, high-voltage relay voltage related data, and a high-voltage relay driving state, wherein the high-voltage relay comprises a positive electrode relay, a negative electrode relay, a pre-charging relay, a charging positive electrode relay, and a charging negative electrode relay.

[0093] A determination module is configured to determine a high-voltage system fault diagnosis mode according to the high-voltage relay driving state, wherein the high-voltage system fault diagnosis mode comprises sampling line state monitoring of a high-voltage detection device, power battery high-voltage connection state monitoring, and high-voltage relay contact state monitoring.

[0094] The diagnostic module diagnoses whether a fault occurs through the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode, and if yes, exits the diagnosis and saves the fault state.

[0095] According to a third aspect of the embodiments of the present application, a terminal is provided, comprising:

[0096] one or more processors;

[0097] a memory for storing instructions executable by the one or more processors;

[0098] wherein the one or more processors are configured to:

[0099] execute the method according to the first aspect of the embodiments of the present application.

[0100] According to a fourth aspect of the embodiments of the present application, a non-transitory computer readable storage medium is provided, which, when instructions in the storage medium are executed by a processor of a terminal, enables the terminal to execute the method according to the first aspect of the embodiments of the present application.

[0101] According to a fifth aspect of the embodiments of the present application, an application product is provided, which, when the application product is running on a terminal, enables the terminal to execute the method according to the first aspect of the embodiments of the present application.

[0102] The present application has the following beneficial effects:

[0103] The present application provides a battery high voltage system fault diagnosis method, device, terminal and storage medium, through the sampling line state monitoring of the high voltage detection device, avoids the missing of the high voltage system and its component fault diagnosis caused by the high voltage detection fault, improves the reliability of the power battery inside and outside high voltage connection state judgment through the power battery high voltage connection state monitoring, and reduces the diagnosis time while ensuring the diagnosis reliability through the high voltage relay contact state monitoring.

[0104] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0105] Figure 1 is a flow chart of a battery high voltage system fault diagnosis method according to an exemplary embodiment;

[0106] Figure 2 is a structural schematic block diagram of an electric vehicle power battery high voltage system fault diagnosis device according to an exemplary embodiment;

[0107] Figure 3 is a structural schematic block diagram of a terminal according to an exemplary embodiment.

[0108] DETAILED DESCRIPTION

[0109] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0110] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0111] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0112] The embodiment of the present application provides a battery high-voltage system fault diagnosis method, which is realized by a terminal. The terminal can be a smart phone, a desktop computer or a notebook computer, etc. The terminal at least includes CPU, etc.

[0113] Embodiment one

[0114] Figure 1 It is a flow chart of a battery high-voltage system fault diagnosis method according to an exemplary embodiment, which is used in a terminal. The method comprises the following steps:

[0115] Step S10, respectively acquiring power battery voltage related data, high-voltage relay voltage related data and high-voltage relay driving state;

[0116] The high-voltage relay includes a positive electrode relay, a negative electrode relay, a pre-charging relay, a charging positive electrode relay and a charging negative electrode relay. The power battery voltage related data includes a battery monomer voltage sum value Vsum, a power battery side high-voltage line voltage Vb and a battery high-voltage line current Ib. The high-voltage relay voltage related data includes a positive electrode relay load side voltage Vlp, a negative electrode relay load side voltage Vln, a high-voltage line voltage Vm detected by a motor controller, a charging positive electrode relay load side voltage Vcp and a charging negative electrode relay load side voltage Vcn.

[0117] In step S20, a high-voltage system fault diagnosis mode is determined through the high-voltage relay driving state, and the high-voltage system fault diagnosis mode includes sampling line state monitoring of the high-voltage detection device, power battery high-voltage connection state monitoring and high-voltage relay contact state monitoring.

[0118] The sampling line state monitoring of the high-voltage detection device includes driving mode high-voltage detection device sampling line state monitoring and direct current charging mode high-voltage detection device sampling line state monitoring. The power battery high-voltage connection state monitoring includes battery inner side high-voltage connection state monitoring and battery outer side high-voltage connection state monitoring. The high-voltage relay contact state monitoring includes charging relay contact state monitoring and positive and negative electrode relay contact state monitoring.

[0119] When the high-voltage relay driving state is that the positive electrode relay and the negative electrode relay are both closed and the pre-charging relay is open, the power battery high-voltage connection state monitoring is the battery outer side high-voltage connection state monitoring. When the high-voltage relay driving state is that the charging positive electrode relay, the charging negative electrode relay and the negative electrode relay are all closed, the sampling line state monitoring of the high-voltage detection device is the direct current charging mode high-voltage detection device sampling line state monitoring. When the high-voltage relay driving state is that the positive electrode relay and the negative electrode relay are both open and the pre-charging relay is open, the power battery high-voltage connection state monitoring is the battery inner side high-voltage connection state monitoring. When the high-voltage relay is open, the high-voltage relay contact state monitoring is the positive and negative electrode relay contact state monitoring. When the positive electrode relay and the negative electrode relay are both closed and the charging positive electrode relay and the charging negative electrode relay are open, the high-voltage relay contact state monitoring is the charging relay contact state monitoring.

[0120] In step S30, whether a fault occurs is diagnosed through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode. If yes, the diagnosis is exited and a fault state is saved. The specific content is as follows:

[0121] When the high-voltage system fault diagnosis mode is the power battery high-voltage connection state monitoring, the following steps are included:

[0122] The battery outside high-voltage connection state monitoring is executed, and the specific content is as follows:

[0123] The absolute value Vf1 of the difference between the power battery side high-voltage line voltage Vb and the battery monomer voltage sum value Vsum, the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum, the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum, and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively acquired;

[0124] When the absolute value of the difference between the power battery side high-voltage line voltage Vb and the battery monomer voltage sum value Vsum is less than the monomer voltage sampling error value V1, the specific judgment is as follows:

[0125] It is judged whether the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0126] Yes, the open circuit fault of the high-voltage load side is detected;

[0127] No, the next step is executed;

[0128] It is judged whether the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0129] Yes, the open circuit fault of the negative electrode relay is detected;

[0130] No, the next step is executed;

[0131] It is judged whether the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the battery monomer voltage sum value Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0132] Yes, the open circuit fault of the positive electrode relay is detected;

[0133] No, the next step is executed;

[0134] The battery inside high-voltage connection state monitoring or the sampling line state monitoring of the direct current charging mode high-voltage detection device is executed, and the specific content of the battery inside high-voltage connection state monitoring is as follows:

[0135] determining whether the absolute value Vf1 of the difference between the high-voltage line voltage Vb on the side of the power battery and the sum value Vsum of the battery cell voltages is less than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0136] Yes, the abnormal state of the high-voltage connection on the side of the power battery is detected.

[0137] No, the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage relay driving state are repeatedly obtained respectively.

[0138] When the high-voltage system fault diagnosis mode is the sampling line state monitoring of the high-voltage detection device in the driving mode, the following steps are included:

[0139] determining whether the sum value Vsum of the battery cell voltages is greater than the voltage limit threshold V0:

[0140] Yes, the next step is performed.

[0141] No, the sampling line state monitoring of the high-voltage detection device in the driving mode is ended.

[0142] determining whether the absolute value of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum value Vsum of the battery cell voltages is less than the single cell voltage sampling error value V1:

[0143] Yes, the high-voltage loop connection state is normal, and the next step is performed.

[0144] No, the sampling line state monitoring of the high-voltage detection device in the driving mode is ended.

[0145] determining whether the absolute value of the difference between the sum value Vsum of the battery cell voltages and the high-voltage line voltage Vb on the side of the power battery is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0146] Yes, the high-voltage sampling line connection state S0 of the bus voltage on the side of the power battery is abnormal.

[0147] No, the next step is performed.

[0148] determining whether the absolute value of the difference between the sum value Vsum of the battery cell voltages and the voltage Vlp on the side of the positive relay load is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0149] Yes, the high-voltage sampling line connection state S1 on the side of the positive relay load is abnormal.

[0150] No, the next step is performed.

[0151] determining whether the absolute value of the difference between the sum value Vsum of the battery cell voltages and the voltage Vln on the side of the negative relay load is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0152] Yes, the high-voltage sampling line connection state S2 of the negative relay load side is abnormal;

[0153] No, repeat the acquisition of the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage relay driving state respectively;

[0154] Report the sampling line connection state to the vehicle end, and store the states S0, S1 and S2 to the battery management system;

[0155] Report the sampling line connection state abnormality to the vehicle end before the vehicle is powered on to start the high-voltage system again after hibernation, so as to avoid the relay sticking caused by the abnormality of the high-voltage detection device missing the relay state.

[0156] When the high-voltage system fault diagnosis mode is the sampling line state monitoring of the high-voltage detection device in the direct current charging mode, the following steps are included:

[0157] Determine whether the battery monomer voltage sum value Vsum is greater than the voltage limit threshold value V0:

[0158] Yes, execute the next step;

[0159] No, end the sampling line state monitoring of the high-voltage detection device in the direct current charging mode;

[0160] Determine whether the battery high-voltage line current Ib is less than the stable charging current value I1:

[0161] Yes, execute the next step;

[0162] No, end the sampling line state monitoring of the high-voltage detection device in the direct current charging mode;

[0163] Acquire the absolute value of the difference between the battery monomer voltage sum value Vsum and the charging positive relay load side voltage Vcp to determine whether it is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0164] Yes, the high-voltage sampling line connection state S3 of the charging positive relay load side is abnormal;

[0165] No, execute the next step;

[0166] Acquire the absolute value of the difference between the battery monomer voltage sum value Vsum and the charging negative relay load side voltage Vcn to determine whether it is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected:

[0167] Yes, the high-voltage sampling line connection state S4 of the charging negative relay load side is abnormal;

[0168] No, repeat the acquisition of the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage relay driving state respectively;

[0169] Report the sampling line connection state to the vehicle end, and store states S3 and S4 to the battery management system.

[0170] Report the sampling line connection state exception to the vehicle end before the vehicle is powered on again after hibernation to start the high-voltage system, to avoid the sticking of the relay due to the abnormal detection of the high-voltage detection device.

[0171] When the high-voltage system fault diagnosis mode is the charging relay contact state monitoring, the following steps are included:

[0172] When the high-voltage system fault diagnosis mode is the high-voltage relay contact state monitoring, the following steps are included:

[0173] Perform the positive and negative electrode relay contact state monitoring, and the specific content is as follows:

[0174] Determine whether the absolute value of the difference between the battery cell voltage sum value Vsum and the power battery side high-voltage line voltage Vb is less than the cell voltage sampling error value V1:

[0175] Yes, perform the next step;

[0176] No, end the positive and negative electrode relay contact state monitoring;

[0177] After the delay t0, collect the delayed positive electrode relay load side voltage Vlp' and the delayed negative electrode relay load side voltage Vln', and the t0 is 3-10 times the high-voltage sampling period;

[0178] Obtain the absolute value of the difference between the positive electrode relay load side voltage Vlp and the delayed positive electrode relay load side voltage Vlp', and the absolute value of the difference between the positive electrode relay load side voltage Vlp and the battery cell voltage sum value Vsum, and determine whether they are less than the cell voltage sampling error value V1:

[0179] Yes, then detect the positive electrode relay contact sticking fault;

[0180] No, perform the next step;

[0181] Obtain the absolute value of the difference between the negative electrode relay load side voltage Vln and the delayed negative electrode relay load side voltage Vln', and the absolute value of the difference between the negative electrode relay load side voltage Vln and the battery cell voltage sum value Vsum, and determine whether they are less than the cell voltage sampling error value V1:

[0182] Yes, then detect the negative electrode relay contact sticking fault;

[0183] No, perform the next step;

[0184] Perform the charging relay contact state monitoring, and the specific content is as follows:

[0185] determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the power battery side high voltage line voltage Vb is less than the cell voltage sampling error value V1:

[0186] Yes, execute the next step;

[0187] No, end the charging relay contact state monitoring;

[0188] After the delay t0, collect the delay charging positive electrode relay load side voltage Vcp' and the delay charging negative electrode relay load side voltage Vcn';

[0189] Obtain the absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the delay charging positive electrode relay load side voltage Vcp', and the absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the battery cell voltage sum value Vsum, and determine whether each is less than the cell voltage sampling error value V1:

[0190] Yes, a charging positive electrode relay contact sticking fault is detected;

[0191] No, execute the next step;

[0192] Obtain the absolute value of the difference between the charging negative electrode relay load side voltage Vcn and the charging positive electrode relay load side voltage Vcn', and the absolute value of the difference between the charging positive electrode relay load side voltage Vcn and the battery cell voltage sum value Vsum, and determine whether each is less than the cell voltage sampling error value V1:

[0193] Yes, a charging negative electrode relay contact sticking fault is detected;

[0194] No, repeat the steps of obtaining the power battery voltage related data, the high voltage relay voltage related data, and the high voltage relay driving state, respectively.

[0195] Embodiment Two

[0196] In an exemplary embodiment, an electric vehicle power battery high voltage system fault diagnosis device is also provided, as shown in Figure 2 The device comprises:

[0197] An acquisition module 210 is configured to obtain power battery voltage related data, high voltage relay voltage related data, and high voltage relay driving states, respectively. The high voltage relay includes a positive electrode relay, a negative electrode relay, a pre-charging relay, a charging positive electrode relay, and a charging negative electrode relay.

[0198] The judgment module 220 is used for determining a high-voltage system fault diagnosis mode through the high-voltage relay driving state, wherein the high-voltage system fault diagnosis mode comprises: sampling line state monitoring of the high-voltage detection device, power battery high-voltage connection state monitoring and high-voltage relay contact state monitoring.

[0199] The diagnosis module 230 is used for diagnosing whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode, and if yes, exiting the diagnosis and saving the fault state.

[0200] The application avoids missing of high-voltage system and component fault diagnosis caused by high-voltage detection fault through the sampling line state monitoring of the high-voltage detection device, improves the reliability of power battery inside and outside high-voltage connection state judgment through the power battery high-voltage connection state monitoring, and reduces the diagnosis time while ensuring the diagnosis reliability through the high-voltage relay contact state monitoring.

[0201] Embodiment three

[0202] Figure 3 is a structural block diagram of a terminal provided by the embodiment of the application, and the terminal can be the terminal in the above embodiments. The terminal 300 can be a portable mobile terminal, such as a smart phone, a tablet computer. The terminal 300 can also be referred to as a user equipment, a portable terminal or other names.

[0203] Generally, the terminal 300 comprises a processor 301 and a memory 302.

[0204] The processor 301 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 301 can be implemented in the form of at least one of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), a PLA (Programmable Logic Array). The processor 301 can also include a main processor and a coprocessor, the main processor being a processor for processing data in an awake state, also known as a CPU (Central Processing Unit), and the coprocessor being a low-power processor for processing data in a standby state. In some embodiments, the processor 301 can be integrated with a GPU (Graphics Processing Unit) that is responsible for rendering and drawing the content to be displayed by the display screen. In some embodiments, the processor 301 can also include an AI (Artificial Intelligence) processor for processing machine learning-related computing operations.

[0205] The memory 302 can include one or more computer-readable storage media that can be tangible and non-transitory. The memory 302 can also include a high-speed random access memory, and a nonvolatile memory such as one or more disk storage devices, flash storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 302 is used to store at least one instruction for being executed by the processor 301 to implement a battery high-voltage system fault diagnosis method provided in the present application.

[0206] In some embodiments, the terminal 300 can also optionally include a peripheral device interface 303 and at least one peripheral device. Specifically, the peripheral device includes at least one of a radio frequency circuit 304, a touch display screen 305, a camera 306, an audio circuit 307, a positioning component 308, and a power supply 309.

[0207] The peripheral device interface 303 can be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 301 and the memory 302. In some embodiments, the processor 301, the memory 302, and the peripheral device interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302, and the peripheral device interface 303 can be implemented on a separate chip or circuit board, and the present embodiment does not limit this.

[0208] The radio frequency circuit 304 is configured to receive and send RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 304 communicates with communication networks and other communication devices through electromagnetic signals. The radio frequency circuit 304 converts electrical signals into electromagnetic signals for transmission, or vice versa. Optionally, the radio frequency circuit 304 includes an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and the like. The radio frequency circuit 304 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to, the World Wide Web, a metropolitan area network, an intranet, various generations of mobile communication networks (2G, 3G, 4G, and 5G), a wireless local area network, and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 304 can also include NFC (Near Field Communication)-related circuitry, which is not limited in the present application.

[0209] The touch display screen 305 is configured to display a UI (User Interface). The UI can include graphics, text, icons, video, and any combination thereof. The touch display screen 305 also has the ability to collect touch signals on or above the surface of the touch display screen 305. The touch signals can be input as control signals to the processor 301 for processing. The touch display screen 305 is configured to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or soft keyboard. In some embodiments, the touch display screen 305 can be one, arranged on the front panel of the terminal 300; in other embodiments, the touch display screen 305 can be at least two, arranged on different surfaces of the terminal 300 or in a folding design; in still other embodiments, the touch display screen 305 can be a flexible display screen, arranged on a curved surface or a folding surface of the terminal 300. Even, the touch display screen 305 can also be arranged in an irregular shape, i.e., a special-shaped screen. The touch display screen 305 can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), and the like.

[0210] The camera component 306 is configured to capture images or videos. Optionally, the camera component 306 includes a front camera and a rear camera. Generally, the front camera is used to implement video call or selfie, and the rear camera is used to implement photo or video shooting. In some embodiments, the rear camera is at least two, which are any one of a main camera, a depth-of-field camera, and a wide-angle camera, to implement the background blur function by fusing the main camera and the depth-of-field camera, and implement the panorama shooting and VR (Virtual Reality) shooting functions by fusing the main camera and the wide-angle camera. In some embodiments, the camera component 306 can further include a flash. The flash can be a single-color-temperature flash or a dual-color-temperature flash. The dual-color-temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation under different color temperatures.

[0211] The audio circuit 307 is configured to provide an audio interface between the user and the terminal 300. The audio circuit 307 can include a microphone and a speaker. The microphone is configured to capture sound waves of the user and the environment, and convert the sound waves into an electrical signal input to the processor 301 for processing or input to the radio frequency circuit 304 to implement voice communication. For the purpose of stereo sound collection or noise reduction, the microphone can be multiple, which are respectively arranged at different parts of the terminal 300. The microphone can also be an array microphone or an omnidirectional collection microphone. The speaker is configured to convert an electrical signal from the processor 301 or the radio frequency circuit 304 into sound waves. The speaker can be a traditional diaphragm speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert an electrical signal into a sound wave audible to humans, but also convert an electrical signal into an inaudible sound wave to humans for ranging purposes. In some embodiments, the audio circuit 307 can further include a headphone jack.

[0212] The positioning component 308 is configured to locate the current geographic position of the terminal 300 to implement navigation or LBS (Location Based Service). The positioning component 308 can be a GPS (Global Positioning System)-based, Beidou system-based or Galileo system-based positioning component.

[0213] The power supply 309 is configured to supply power to each component in the terminal 300. The power supply 309 can be an alternating current, a direct current, a disposable battery or a rechargeable battery. When the power supply 309 includes a rechargeable battery, the rechargeable battery can be a wired charging battery or a wireless charging battery. The wired charging battery is a battery charged through a wired line, and the wireless charging battery is a battery charged through a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0214] Those skilled in the art can understand that,Figure 3 The structure shown in the figure is not intended to limit the terminal 300, and the terminal 300 can include more or fewer components than shown in the figure, or can combine some components, or use different arrangements of components.

[0215] Embodiment Four

[0216] In an example embodiment, a computer readable storage medium is also provided, and the computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the battery high-voltage system fault diagnosis method provided by all the embodiments of the application.

[0217] Any combination of one or more computer readable medium can be employed. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer readable storage medium can be any tangible medium that contains or stores a program used by or in connection with an instruction execution system, apparatus, or device.

[0218] The computer readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave, in which the computer readable program code is contained. Such propagated data signal can take many forms, including but not limited to, electro-magnetic signal, optical signal, or any suitable combination of the above. The computer readable signal medium can also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate or transport program for use by or in connection with an instruction execution system, apparatus, or device.

[0219] The program code contained on the computer readable medium can be transmitted using any suitable medium, including but not limited to wireless, wire line, optical cable, RF, etc., or any suitable combination of the above.

[0220] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0221] Embodiment Five

[0222] In an example embodiment, an application program product is also provided, comprising one or more instructions executable by the processor 301 of the above-mentioned apparatus to complete the above-mentioned battery high-voltage system fault diagnosis method.

[0223] While the embodiments of the application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments. It can be fully applied to various fields suitable for the application. Additional modifications can be easily implemented by those skilled in the art. Therefore, the application is not limited to specific details and the figures shown and described herein without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A battery high-voltage system failure diagnosis method characterized by comprising: The application relates to a high-voltage system fault diagnosis method and device. Respectively acquire power battery voltage related data, high-voltage relay voltage related data and high-voltage relay driving state, wherein the high-voltage relay comprises a positive electrode relay, a negative electrode relay, a pre-charging relay, a charging positive electrode relay and a charging negative electrode relay; Determine a high-voltage system fault diagnosis mode through the high-voltage relay driving state, wherein the high-voltage system fault diagnosis mode comprises sampling line state monitoring of a high-voltage detection device, power battery high-voltage connection state monitoring and high-voltage relay contact state monitoring; Diagnose whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode, and if yes, exit the diagnosis and save the fault state; The power battery voltage related data comprises a battery monomer voltage total value Vsum, a power battery side high-voltage line voltage Vb and a battery high-voltage line current Ib, the high-voltage relay voltage related data comprises a positive electrode relay load side voltage Vlp, a negative electrode relay load side voltage Vln, a high-voltage line voltage Vm detected by a motor controller, a charging positive electrode relay load side voltage Vcp and a charging negative electrode relay load side voltage Vcn, the sampling line state monitoring of the high-voltage detection device comprises sampling line state monitoring of a high-voltage detection device in a driving mode and sampling line state monitoring of a high-voltage detection device in a direct current charging mode, the power battery high-voltage connection state monitoring comprises battery inner side high-voltage connection state monitoring and battery outer side high-voltage connection state monitoring, and the high-voltage relay contact state monitoring comprises charging relay contact state monitoring and positive and negative electrode relay contact state monitoring; The determination of the high-voltage system fault diagnosis mode through the high-voltage relay driving state comprises: When the high-voltage relay driving state is positive electrode relay and negative electrode relay closing state and pre-charging relay opening state, the power battery high-voltage connection state monitoring is battery outer side high-voltage connection state monitoring; When the high-voltage relay driving state is charging positive electrode relay, charging negative electrode relay and negative electrode relay closing state, the sampling line state monitoring of the high-voltage detection device is sampling line state monitoring of a high-voltage detection device in a direct current charging mode; When the high-voltage relay driving state is positive electrode relay and negative electrode relay opening state and pre-charging relay opening state, the power battery high-voltage connection state monitoring is battery inner side high-voltage connection state monitoring; When the high-voltage relay opening state, the high-voltage relay contact state monitoring is positive and negative electrode relay contact state monitoring; When the positive electrode relay and the negative electrode relay are in closing state and the charging positive electrode relay and the charging negative electrode relay are in opening state, the high-voltage relay contact state monitoring is charging relay contact state monitoring; The diagnosis of whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode comprises: When the high-voltage system fault diagnosis mode is power battery high-voltage connection state monitoring, the following steps are included: Perform the battery outer side high-voltage connection state monitoring, and the specific content is as follows: respectively, the absolute value Vf1 of the difference between the high-voltage line voltage Vb on the side of the power battery and the sum of the battery cell voltages Vsum, the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the sum of the battery cell voltages Vsum, the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the sum of the battery cell voltages Vsum, and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum; When the absolute value of the difference between the high-voltage line voltage Vb on the side of the power battery and the sum of the battery cell voltages Vsum is less than the single cell voltage sampling error value V1, the specific judgment is as follows: whether the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the open circuit fault of the high-voltage load side is detected; No, the next step is executed; whether the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the sum of the battery cell voltages Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the open circuit fault of the negative electrode relay is detected; No, the next step is executed; whether the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the sum of the battery cell voltages Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the open circuit fault of the positive electrode relay is detected; No, the next step is executed; The sampling line state monitoring of the high-voltage detection device in the direct current charging mode is executed, and the specific content of the high-voltage connection state monitoring inside the battery is as follows: whether the absolute value Vf1 of the difference between the high-voltage line voltage Vb on the side of the power battery and the sum of the battery cell voltages Vsum is less than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage connection abnormal state on the side of the power battery is detected; No, the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode are repeatedly acquired.

2. The method of claim 1, wherein the method further comprises: The diagnosis of whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data and the high-voltage system fault diagnosis mode includes: When the high-voltage system fault diagnosis mode is the sampling line state monitoring of the high-voltage detection device in the driving mode, the following steps are included: whether the sum of the battery cell voltages Vsum is greater than the voltage limit threshold V0: Yes, the next step is executed; No, the sampling line state monitoring of the high-voltage detection device in the driving mode is ended; whether the absolute value of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum is less than the single cell voltage sampling error value V1: Yes, the next step is executed; No, the sampling line state monitoring of the high-voltage detection device in the driving mode is ended; determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the high-voltage line voltage Vb of the power battery side is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage sampling line connection state S0 of the power battery side bus voltage is in an abnormal state; No, the next step is performed; determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the positive electrode relay load side voltage Vlp is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage sampling line connection state S1 of the positive electrode relay load side is in an abnormal state; No, the next step is performed; determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the negative electrode relay load side voltage Vln is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage sampling line connection state S2 of the negative electrode relay load side is in an abnormal state; No, the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage relay driving state are repeatedly obtained respectively.

3. The method of claim 1, wherein the method further comprises: The diagnosis of whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage system fault diagnosis mode includes: When the high-voltage system fault diagnosis mode is the sampling line state monitoring of the direct current charging mode high-voltage detection device, the following steps are included: determining whether the battery cell voltage sum value Vsum is greater than the voltage limit threshold value V0: Yes, the next step is performed; No, the sampling line state monitoring of the direct current charging mode high-voltage detection device is ended; determining whether the battery high-voltage line current Ib is less than the stable charging current value I1: Yes, the next step is performed; No, the sampling line state monitoring of the direct current charging mode high-voltage detection device is ended; obtaining the absolute value of the difference between the battery cell voltage sum value Vsum and the charging positive electrode relay load side voltage Vcp and determining whether it is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage sampling line connection state S3 of the charging positive electrode relay load side is abnormal; No, the next step is performed; obtaining the absolute value of the difference between the battery cell voltage sum value Vsum and the charging negative electrode relay load side voltage Vcn and determining whether it is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, the high-voltage sampling line connection state S4 of the charging negative electrode relay load side is abnormal; No, the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage relay driving state are repeatedly obtained respectively.

4. The method of claim 1, wherein, The diagnosis of whether a fault occurs through the power battery voltage related data, the high-voltage relay voltage related data, and the high-voltage system fault diagnosis mode includes: When the high-voltage system fault diagnosis mode is the charging relay contact state monitoring, the following steps are included: When the high-voltage system fault diagnosis mode is the high-voltage relay contact state monitoring, the following steps are included: The positive and negative electrode relay contact state monitoring is performed, and the specific content is as follows: determining whether the absolute value of the difference between the battery cell voltage sum value Vsum and the high-voltage line voltage Vb of the power battery side is less than the single cell voltage sampling error value V1: Yes, the next step is performed; No, the positive and negative electrode relay contact state monitoring is ended; After the delay t0, the delayed positive electrode relay load side voltage Vlp' and the delayed negative electrode relay load side voltage Vln' are collected, and t0 is 3-10 times the high voltage sampling period; The absolute value of the difference between the positive electrode relay load side voltage Vlp and the delayed positive electrode relay load side voltage Vlp' and the absolute value of the difference between the positive electrode relay load side voltage Vlp and the battery cell voltage sum value Vsum are obtained to determine whether they are less than the cell voltage sampling error value V1: Yes, the positive electrode relay contact sticking fault is detected; No, the next step is performed; The absolute value of the difference between the negative electrode relay load side voltage Vln and the delayed negative electrode relay load side voltage Vln' and the absolute value of the difference between the negative electrode relay load side voltage Vln and the battery cell voltage sum value Vsum are obtained to determine whether they are less than the cell voltage sampling error value V1: Yes, the negative electrode relay contact sticking fault is detected; No, the next step is performed; The charging relay contact state monitoring is performed, and the specific content is as follows: Determine whether the absolute value of the difference between the battery cell voltage sum value Vsum and the power battery side high voltage line voltage Vb is less than the cell voltage sampling error value V1: Yes, the next step is performed; No, the charging relay contact state monitoring is ended; After the delay t0, the delayed charging positive electrode relay load side voltage Vcp' and the delayed charging negative electrode relay load side voltage Vcn' are collected; The absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the delayed charging positive electrode relay load side voltage Vcp' and the absolute value of the difference between the charging positive electrode relay load side voltage Vcp and the battery cell voltage sum value Vsum are obtained to determine whether they are less than the cell voltage sampling error value V1: Yes, the charging positive electrode relay contact sticking fault is detected; No, the next step is performed; The absolute value of the difference between the charging negative electrode relay load side voltage Vcn and the charging positive electrode relay load side voltage Vcn' and the absolute value of the difference between the charging positive electrode relay load side voltage Vcn and the battery cell voltage sum value Vsum are obtained to determine whether they are less than the cell voltage sampling error value V1: Yes, the charging negative electrode relay contact sticking fault is detected; No, the power battery voltage related data, the high voltage relay voltage related data and the high voltage relay driving state are repeatedly obtained.

5. An electric vehicle power battery high-voltage system fault diagnosis device, characterized in that, It includes: An acquisition module is configured to acquire power battery voltage related data, high voltage relay voltage related data and high voltage relay driving state, and the high voltage relay includes a positive electrode relay, a negative electrode relay, a pre-charging relay, a charging positive electrode relay and a charging negative electrode relay; A judgment module is configured to determine a high voltage system fault diagnosis mode through the high voltage relay driving state, and the high voltage system fault diagnosis mode includes sampling line state monitoring of a high voltage detection device, power battery high voltage connection state monitoring and high voltage relay contact state monitoring; A diagnosis module is configured to diagnose whether a fault occurs through the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode, and if yes, the diagnosis is exited and the fault state is saved. The power battery voltage related data includes: battery monomer voltage sum value Vsum, power battery side high voltage line voltage Vb, battery high voltage line current Ib, the high voltage relay voltage related data includes: positive electrode relay load side voltage Vlp, negative electrode relay load side voltage Vln, motor controller detected high voltage line voltage Vm, charging positive electrode relay load side voltage Vcp and charging negative electrode relay load side voltage Vcn, the sampling line state monitoring of the high voltage detection device includes: sampling line state monitoring of the driving mode high voltage detection device and sampling line state monitoring of the direct current charging mode high voltage detection device, the power battery high voltage connection state monitoring includes: battery inner side high voltage connection state monitoring and battery outer side high voltage connection state monitoring, and the high voltage relay contact state monitoring includes: charging relay contact state monitoring and positive and negative electrode relay contact state monitoring; The high voltage system fault diagnosis mode determined through the high voltage relay driving state includes: When the high voltage relay driving state is that the positive electrode relay and the negative electrode relay are both closed and the pre-charging relay is opened, the power battery high voltage connection state monitoring is the battery outer side high voltage connection state monitoring; When the high voltage relay driving state is that the charging positive electrode relay, the charging negative electrode relay and the negative electrode relay are all closed, the sampling line state monitoring of the high voltage detection device is the sampling line state monitoring of the direct current charging mode high voltage detection device; When the high voltage relay driving state is that the positive electrode relay and the negative electrode relay are both opened and the pre-charging relay is opened, the power battery high voltage connection state monitoring is the battery inner side high voltage connection state monitoring; When the high voltage relay is opened, the high voltage relay contact state monitoring is the positive and negative electrode relay contact state monitoring; When the positive electrode relay and the negative electrode relay are both closed and the charging positive electrode relay and the charging negative electrode relay are opened, the high voltage relay contact state monitoring is the charging relay contact state monitoring; The diagnosis of whether a fault occurs through the power battery voltage related data, the high voltage relay voltage related data and the high voltage system fault diagnosis mode includes: When the high voltage system fault diagnosis mode is the power battery high voltage connection state monitoring, the following steps are included: The battery outer side high voltage connection state monitoring is performed, and the specific content is as follows: The absolute value Vf1 of the difference between the power battery side high voltage line voltage Vb and the battery monomer voltage sum value Vsum, the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the battery monomer voltage sum value Vsum, the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the battery monomer voltage sum value Vsum and the absolute value Vf4 of the difference between the motor controller detected high voltage line voltage Vm and the battery monomer voltage sum value Vsum are respectively acquired; When the absolute value of the difference between the power battery side high voltage line voltage Vb and the battery monomer voltage sum value Vsum is less than the monomer voltage sampling error value V1, the specific judgment is as follows: determining whether the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum is greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, an open-circuit fault on the high-voltage load side is detected; No, the next step is performed; determining whether the absolute value Vf3 of the difference between the negative electrode relay load side voltage Vln and the sum of the battery cell voltages Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, an open-circuit fault of the negative electrode relay is detected; No, the next step is performed; determining whether the absolute value Vf2 of the difference between the positive electrode relay load side voltage Vlp and the sum of the battery cell voltages Vsum and the absolute value Vf4 of the difference between the high-voltage line voltage Vm detected by the motor controller and the sum of the battery cell voltages Vsum are respectively greater than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, an open-circuit fault of the positive electrode relay is detected; No, the next step is performed; performing sampling line state monitoring of the battery inside high-voltage connection state monitoring or direct current charging mode high-voltage detection device, and the specific content of the battery inside high-voltage connection state monitoring is as follows: determining whether the absolute value Vf1 of the difference between the power battery side high-voltage line voltage Vb and the sum of the battery cell voltages Vsum is less than the voltage sampling value V2 when the high-voltage sampling line is disconnected: Yes, a power battery side high-voltage connection abnormal state is detected; No, the power battery voltage related data, high-voltage relay voltage related data, and high-voltage relay driving state are repeatedly obtained.

6. A terminal, characterized by comprising: Comprise: one or more processors; a memory for storing instructions executable by the one or more processors; wherein the one or more processors are configured to: perform a battery high-voltage system fault diagnosis method as claimed in any one of claims 1 to 4.

7. A non-transitory computer-readable storage medium, comprising: When the instructions in the storage medium are executed by the processor of the terminal, the terminal can perform a battery high-voltage system fault diagnosis method as claimed in any one of claims 1 to 4.

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