Method for monitoring a high-voltage system of a battery and vehicle

Abstract

The application discloses a kind of battery high voltage system monitoring method and vehicle.Therein, the method includes: obtaining the running state of preset voltage sampling module, and the multiple relay identifiers of multiple relays in battery high voltage system;In response to the normal operation of preset voltage sampling module, based on preset voltage sampling module and multiple relay identifiers, voltage sampling is carried out on multiple relays, and multiple relay voltages are obtained;Based on multiple relay voltages and the total voltage of battery high voltage system, the multiple running states of multiple relays are determined, wherein the total voltage of battery is the voltage obtained by converting relay voltage according to loop voltage voltage division rule;Based on multiple running states, the system state of battery high voltage system is output.The application solves the technical problem of low monitoring accuracy of battery high voltage system in related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of system monitoring, in particular to a battery high-voltage system monitoring method and a vehicle. BACKGROUND

[0002] The battery high-voltage system state monitoring and diagnosis in a new energy vehicle is crucial for the safety of the vehicle. Currently, the state diagnosis of the relay in the battery high-voltage system is usually to determine whether the relay fails, such as being unable to close or sticking, by judging the voltage difference between the front and rear ends of the relay contact. However, using this method, especially for the diagnosis of the state of the high-voltage negative relay, it is easy to misreport the state, resulting in inaccurate system state of the battery high-voltage system determined.

[0003] At present, there is no effective solution to the above problems. SUMMARY

[0004] The embodiments of the present application provide a battery high-voltage system monitoring method and a vehicle to at least solve the technical problem of low monitoring accuracy of the battery high-voltage system in the related art.

[0005] According to an aspect of an embodiment of the present application, a battery high-voltage system monitoring method is provided, which comprises: obtaining the running state of a preset voltage sampling module and a plurality of relay identifiers of a plurality of relays in a battery high-voltage system; in response to the normal running of the preset voltage sampling module, sampling the voltage of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers to obtain a plurality of relay voltages; determining a plurality of running states of the plurality of relays based on the plurality of relay voltages and a battery total voltage of the battery high-voltage system, wherein the battery total voltage is a voltage obtained by converting the relay voltage according to a loop voltage division rule; and outputting the system state of the battery high-voltage system based on the plurality of running states.

[0006] Optionally, sampling the voltage of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers to obtain the plurality of relay voltages comprises: controlling the disconnection of the plurality of relays; determining the voltage sampling sequence between the plurality of relay identifiers from a preset identifier sequence table, wherein the preset identifier sequence table is used to represent the mapping relationship between the relay identifier and the voltage sampling sequence; and sampling the voltage of the plurality of relays based on the preset voltage sampling module according to the voltage sampling sequence to obtain the plurality of relay voltages.

[0007] Optionally, the plurality of relays at least comprises: a high-voltage positive relay, a pre-charge relay, a high-voltage negative relay, and a charging negative relay, a voltage sampling sequence of the pre-charge relay is after a voltage sampling sequence of the high-voltage positive relay, a voltage sampling sequence of the high-voltage negative relay is after the voltage sampling sequence of the pre-charge relay, a voltage sampling sequence of the charging negative relay is after the voltage sampling sequence of the high-voltage negative relay, and the preset voltage sampling module at least comprises: a first reference ground sampling module and a second reference ground sampling module, a corresponding reference ground sampling loop of the first reference ground sampling module comprises the high-voltage positive relay and the pre-charge relay, and a corresponding reference ground sampling loop of the second reference ground sampling module comprises the high-voltage negative relay and the charging negative relay.

[0008] Optionally, based on the preset voltage sampling module, voltage sampling is performed on the plurality of relays in the voltage sampling sequence to obtain a plurality of relay voltages, comprising: based on the first reference ground sampling module, sampling a front contact of the high-voltage positive relay to obtain a first positive relay voltage; based on the first reference ground sampling module, sampling a rear contact of the high-voltage positive relay to obtain a second positive relay voltage; based on the first reference ground sampling module, sampling a rear contact contained in the pre-charge relay to obtain a pre-charge relay voltage; based on the second reference ground sampling module, sampling a rear contact contained in the high-voltage negative relay to obtain a first negative relay voltage; and based on the second reference ground sampling module, sampling a rear contact contained in the charging negative relay to obtain a second negative relay voltage.

[0009] Optionally, based on the plurality of relay voltages and the total voltage of the battery, a plurality of operating states of the plurality of relays are determined, comprising: obtaining component features of a plurality of voltage dividing components for dividing the total voltage of the battery, and the total voltage of the battery, wherein the total voltage of the battery is a voltage determined based on the first positive relay voltage and a first resistance value of a first voltage dividing resistor in the plurality of voltage dividing components; based on the total voltage of the battery and a plurality of first relay voltages of a plurality of first relays contained in a first preset loop in the battery high-voltage system, a plurality of operating states of the plurality of first relays are determined; based on the component features and a plurality of second relay voltages of a plurality of second relays contained in a second preset loop in the battery high-voltage system, a plurality of operating states of the plurality of second relays are determined.

[0010] Optionally, the plurality of first relays comprises a high-voltage positive relay and a pre-charge relay, the plurality of first relay voltages comprises a second positive relay voltage and a pre-charge relay voltage, and the determining the plurality of operating states of the plurality of first relays based on the total battery voltage and the plurality of first relay voltages of the plurality of first relays contained in the first preset loop in the high-voltage system comprises: obtaining a first difference between the total battery voltage and the second positive relay voltage and a second difference between the total battery voltage and the pre-charge relay voltage; determining, based on the first difference and a first sticking voltage range, whether the high-voltage positive relay is stuck according to the operating state of the high-voltage positive relay; and determining, based on the second difference and a second sticking voltage range, whether the pre-charge relay is stuck according to the operating state of the pre-charge relay.

[0011] Optionally, the plurality of second relays comprises a high-voltage negative relay and a charging negative relay, the plurality of second relay voltages comprises a first negative relay voltage and a second negative relay voltage, the voltage dividing assembly further comprises a second voltage dividing resistor of a loop in which the high-voltage negative relay is located and a diode of a loop in which the charging negative relay is located, and the plurality of operating states of the plurality of second relays are determined based on assembly characteristics and the plurality of second relay voltages of the plurality of second relays contained in the second preset loop in the high-voltage system, the assembly characteristics comprising a second resistance value of the second voltage dividing resistor and a forward voltage drop of the diode, and the determining the plurality of operating states of the plurality of second relays comprises: determining a third negative relay voltage based on the first negative relay voltage and the second resistance value; determining, based on a third difference between the third negative relay voltage and the total battery voltage and a third sticking voltage range, whether the high-voltage negative relay is stuck according to the operating state of the high-voltage negative relay; and determining, based on a fourth difference between the second negative relay voltage and the forward voltage drop and a fourth sticking voltage range, whether the charging negative relay is stuck according to the operating state of the charging negative relay.

[0012] Optionally, the system state of the battery high-voltage system is output based on the plurality of operating states, and the outputting the system state of the battery high-voltage system based on the plurality of operating states comprises: in response to the operating state of the plurality of relays not being that the plurality of relays are stuck, controlling the plurality of relays to work based on a working control sequence of the plurality of relays; obtaining a load end voltage corresponding to the plurality of relays after working and a first output end voltage of the battery high-voltage system; determining a second output end voltage based on the load end voltage and a third resistance value of a third voltage dividing resistor, wherein the third voltage dividing resistor is used to represent a voltage dividing resistor connected to a load end of the battery high-voltage system; and in response to the first output end voltage and the second output end voltage satisfying a preset voltage condition, determining that the system state is normal.

[0013] Optionally, the plurality of relays are controlled to work based on a working control sequence of the plurality of relays, and the controlling the plurality of relays to work based on the working control sequence of the plurality of relays comprises: controlling the high-voltage negative relay to close; in response to the high-voltage negative relay closing successfully, controlling the pre-charge relay to close; in response to the pre-charge relay closing successfully and pre-charging the load end of the battery high-voltage system successfully, controlling the high-voltage positive relay to close and the pre-charge relay to open.

[0014] According to another aspect of the embodiments of the present application, a monitoring device for a battery high-voltage system is also provided. The device comprises: an acquisition module configured to acquire an operating state of a preset voltage sampling module and a plurality of relay identifiers of a plurality of relays in the battery high-voltage system; a sampling module configured to, in response to the preset voltage sampling module operating normally, sample voltages of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers, to obtain a plurality of relay voltages; a determination module configured to determine a plurality of operating states of the plurality of relays based on the plurality of relay voltages and a total voltage of the battery high-voltage system, wherein the total voltage of the battery high-voltage system is a voltage converted from the relay voltages according to a loop voltage division rule; and an output module configured to output a system state of the battery high-voltage system based on the plurality of operating states.

[0015] Optionally, the sampling module comprises: a disconnecting unit configured to control disconnection of the plurality of relays; a sequence determination module configured to determine a voltage sampling sequence between the plurality of relay identifiers from a preset identifier sequence table, wherein the preset identifier sequence table is configured to represent a mapping relationship between the relay identifiers and the voltage sampling sequence; and a sampling unit configured to sample the voltages of the plurality of relays according to the voltage sampling sequence based on the preset voltage sampling module, to obtain the plurality of relay voltages.

[0016] Optionally, the plurality of relays at least comprises: a high-voltage positive relay, a pre-charge relay, a high-voltage negative relay, and a charging negative relay, the voltage sampling sequence of the pre-charge relay is after the voltage sampling sequence of the high-voltage positive relay, the voltage sampling sequence of the high-voltage negative relay is after the voltage sampling sequence of the pre-charge relay, the voltage sampling sequence of the charging negative relay is after the voltage sampling sequence of the high-voltage negative relay, and the preset voltage sampling module at least comprises: a first reference ground sampling module and a second reference ground sampling module, a reference ground sampling loop corresponding to the first reference ground sampling module comprises the high-voltage positive relay and the pre-charge relay, and a reference ground sampling loop corresponding to the second reference ground sampling module comprises the high-voltage negative relay and the charging negative relay.

[0017] Optionally, the sampling unit is further configured to: sample a front contact of the high-voltage positive relay based on the first reference ground sampling module to obtain a first positive relay voltage; sample a rear contact of the high-voltage positive relay based on the first reference ground sampling module to obtain a second positive relay voltage; sample a rear contact contained in the pre-charge relay based on the first reference ground sampling module to obtain a pre-charge relay voltage; sample a rear contact contained in the high-voltage negative relay based on the second reference ground sampling module to obtain a first negative relay voltage; and sample a rear contact contained in the charging negative relay based on the second reference ground sampling module to obtain a second negative relay voltage.

[0018] Optionally, the determining module comprises: a component feature acquisition unit, configured to acquire component features of a plurality of voltage division components for voltage division of a total battery voltage, and the total battery voltage, wherein the total battery voltage is a voltage determined based on a first positive relay voltage and a first resistance value of a first voltage division resistor in the plurality of voltage division components; a first state determination unit, configured to determine a plurality of operating states of a plurality of first relays in a first preset loop in a high-voltage system of a battery based on the total battery voltage and a plurality of first relay voltages of the plurality of first relays; and a second state determination unit, configured to determine a plurality of operating states of a plurality of second relays in a second preset loop in the high-voltage system of the battery based on the component features and a plurality of second relay voltages of the plurality of second relays.

[0019] Optionally, the plurality of first relays comprise a high-voltage positive relay and a pre-charge relay, the plurality of first relay voltages comprise a second positive relay voltage and a pre-charge relay voltage, and the first state determination unit is further configured to: acquire a first difference between the total battery voltage and the second positive relay voltage, and a second difference between the total battery voltage and the pre-charge relay voltage; determine, based on the first difference and a first sticking voltage range, whether the operating state of the high-voltage positive relay is that the high-voltage positive relay is stuck; and determine, based on the second difference and a second sticking voltage range, whether the operating state of the pre-charge relay is that the pre-charge relay is stuck.

[0020] Optionally, the plurality of second relays comprise a high-voltage negative relay and a charging negative relay, the plurality of second relay voltages comprise a first negative relay voltage and a second negative relay voltage, the voltage division components further comprise a second voltage division resistor in a loop in which the high-voltage negative relay is located and a diode in a loop in which the charging negative relay is located, and the component features comprise a second resistance value of the second voltage division resistor and a drop voltage of the diode, and the second state determination unit is further configured to: determine, based on the first negative relay voltage and the second resistance value, a third negative relay voltage; determine, based on a third difference between the third negative relay voltage and the total battery voltage and a third sticking voltage range, whether the operating state of the high-voltage negative relay is that the high-voltage negative relay is stuck; and determine, based on a fourth difference between the second negative relay voltage and the drop voltage and a fourth sticking voltage range, whether the operating state of the charging negative relay is that the charging negative relay is stuck.

[0021] Optionally, the output module comprises: a control unit configured to, in response to the operating state of the plurality of relays not being that the plurality of relays are stuck, control the plurality of relays to work based on the working control sequence of the plurality of relays; a voltage acquisition unit configured to acquire a load end voltage corresponding to the plurality of relays after working and a first output end voltage of the battery high-voltage system; a voltage determination unit configured to determine a second output end voltage based on the load end voltage and a third resistance value of a third voltage dividing resistor, wherein the third voltage dividing resistor is used to represent a voltage dividing resistor connected to the load end of the battery high-voltage system; and a third state determination unit configured to, in response to the first output end voltage and the second output end voltage satisfying a preset voltage condition, determine that the system state is normal.

[0022] Optionally, the control unit is further configured to: control the high-voltage negative relay to close; in response to the high-voltage negative relay closing successfully, control the pre-charging relay to close; in response to the pre-charging relay closing successfully and the load end of the battery high-voltage system being successfully pre-charged, control the high-voltage positive relay to close and control the pre-charging relay to open.

[0023] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which comprises a stored program, wherein the program, when executed, controls the device where the computer readable storage medium is located to perform any of the above battery high-voltage system monitoring methods.

[0024] According to another aspect of the embodiments of the present application, a processor is also provided, which is configured to execute a program, wherein the program, when executed, performs any of the above battery high-voltage system monitoring methods.

[0025] According to another aspect of the embodiments of the present application, a vehicle is also provided, which comprises at least one processor and a memory connected to the at least one processor in communication, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any of the above battery high-voltage system monitoring methods.

[0026] In the embodiment of the present application, the running state of the preset voltage sampling module is acquired, and a plurality of relay identifiers of a plurality of relays in the battery high-voltage system are acquired; in response to the normal operation of the preset voltage sampling module, the plurality of relays are voltage-sampled based on the preset voltage sampling module and the plurality of relay identifiers, to obtain a plurality of relay voltages; based on the plurality of relay voltages and a total voltage of the battery high-voltage system, a plurality of running states of the plurality of relays are determined; and based on a plurality of running states outputting a system state of the battery high-voltage system, the running states of the plurality of relays are determined according to the total voltage of the battery high-voltage system and the plurality of relay voltages, respectively, so as to reduce the error when the running state of the relay is determined directly according to the relay voltage, improve the accuracy of the determined running state of the relay, and then determine the system state of the battery high-voltage system according to the running states of the plurality of relays with higher accuracy, so as to further improve the accuracy of the determined system state, and thus solve the technical problem of low monitoring accuracy of the battery high-voltage system in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0028] Figure 1 FIG. 1 is a schematic diagram of a battery high-voltage system monitoring method according to an embodiment of the present application;

[0029] Figure 2 FIG. 2 is a schematic diagram of a battery high-voltage system structure according to an embodiment of the present application;

[0030] Figure 3 FIG. 3 is a schematic diagram of a battery high-voltage system monitoring process according to an embodiment of the present application;

[0031] Figure 4 FIG. 4 is a structural block diagram of a battery high-voltage system monitoring device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the scope of protection of the present application.

[0033] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the application as well as the above description of the drawings merely specify a certain order, and cannot be understood as implying a specific order or chronology. It is to be understood that the data thus designated can be interchanged, where appropriate, so that the embodiments of the application described herein can be carried out in an order other than that illustrated or described herein. Furthermore, the terms "comprise" and "have", as well as any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus that comprises a list of steps or units need not be limited to those steps or units expressly listed, but can include other steps or units that are not expressly listed or inherent to such processes, methods, products, or apparatuses.

[0034] Embodiment 1

[0035] According to an embodiment of the application, an embodiment of a method for monitoring a battery high-voltage system is provided. It is to be understood that the steps shown in the flowcharts of the drawings can be executed in a computer system, such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Figure 1 is a schematic diagram of a method for monitoring a battery high-voltage system according to an embodiment of the application, as shown in Figure 1 the method comprises the following steps:

[0037] In step S102, the running state of a preset voltage sampling module and a plurality of relay identifiers of a plurality of relays in the battery high-voltage system are obtained.

[0038] The voltage sampling module can be a module for sampling the voltage on the different contacts of the plurality of relays.

[0039] In an optional solution of the embodiment, considering that a plurality of different relays are usually included in the battery high-voltage system, the operating states of the plurality of relays can reflect the system state of the battery high-voltage system in real time, that is, whether the battery high-voltage system can operate normally, therefore, when the battery high-voltage system is powered on, the monitoring system can monitor the system state of the battery high-voltage system, that is, the monitoring system can first acquire the operating states of the plurality of relays, and considering that the operating states of the plurality of relays, that is, whether the relays can operate normally, are related to the voltage on the relay contact, therefore, in order to accurately determine the operating states of the plurality of relays and further accurately determine the system state of the battery high-voltage system, the monitoring system can first acquire the operating state of the preset voltage sampling module for sampling the voltage on the relay contact and the relay identifiers corresponding to the plurality of relays, to avoid the case that the relay voltages of the plurality of relays collected are inaccurate when the preset voltage sampling module is abnormal.

[0040] In an optional solution of the embodiment, the preset voltage sampling module can be used to pre-sample a calibration voltage, and in the case that the sampled voltage is the same as the calibration voltage, it can be determined that the preset voltage sampling module is normal.

[0041] In an optional solution of the embodiment, in addition to the preset voltage sampling module, a corresponding power supply module can also be additionally provided, instead of directly connecting the preset voltage sampling module to the vehicle battery, so as to avoid affecting the operation of the battery high-voltage system of the vehicle battery when the preset voltage sampling module is operating.

[0042] Step S104, in response to the normal operation of the preset voltage sampling module, sampling the voltages of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers, to obtain a plurality of relay voltages;

[0043] In the case that the preset voltage sampling module can operate normally, the monitoring system can use the preset voltage sampling module and the plurality of relay identifiers to sample the voltages of the plurality of relays respectively, to obtain the plurality of relay voltages.

[0044] In an optional solution of the embodiment, different voltage sampling modules can also be allocated to different relays, that is, a plurality of preset voltage sampling modules can be provided, to reduce the influence of continuous voltage sampling on the sampling accuracy of the preset voltage sampling module, so as to ensure that the monitoring system can acquire the plurality of relay voltages with high accuracy.

[0045] Step S106, determining a plurality of operating states of the plurality of relays based on the plurality of relay voltages and the total voltage of the battery high-voltage system.

[0046] The battery total voltage is converted from the relay voltage according to the loop voltage division rule.

[0047] The battery total voltage of the battery high-voltage system can be obtained from the configuration parameters of the battery high-voltage system, that is, the calibration input voltage of the battery high-voltage system, or can be obtained by directly sampling the voltage of the input end of the battery high-voltage system through a voltage sensor. In order to take into account the voltage loss caused by the wire resistance when the current is transmitted in the circuit, in order to more accurately determine the actual battery total voltage in the battery high-voltage system, the battery total voltage can be determined according to the sampled relay voltage, for example, the input voltage of the input end of the relay, and the loop connection mode and loop voltage division rule of the battery high-voltage system. In an optional solution of the embodiment, before obtaining the running state of the preset voltage sampling module, the monitoring system can also compare the battery total voltage of the battery high-voltage system with the sum of the cell voltages to determine whether there is a connection fault at the multiple ports of the battery, thereby reducing the failure rate when monitoring the battery high-voltage system.

[0048] The running state can indicate whether the relay can accurately operate according to the control instruction, for example, when the control instruction is to close the relay, the corresponding running state can reflect whether the relay can trigger the closing behavior, whether the closing is successful, etc.; when the control instruction is to open the relay, the corresponding running state can reflect whether the relay can trigger the opening behavior, whether the opening is successful, whether sticking occurs, etc.

[0049] In an optional solution of the embodiment, the battery total voltage of the battery high-voltage system can be used to determine whether the multiple relay voltages are normal, thereby determining the running state of the multiple relays corresponding to the multiple relay voltages. For example, the output voltage of the output end of the relay in an ideal state can be determined by using the battery total resistance and the loop voltage division rule, and the output voltage is compared with the voltage collected from the output end of the relay. When the two are the same or the difference between the two is within a controllable range, it can be determined that the relay can operate normally, otherwise it can be determined that the relay is faulty, for example, cannot be closed or sticking occurs, etc.

[0050] In an optional solution of the embodiment, after obtaining the multiple relay voltages, the monitoring system can also directly use the pre-set calibration voltage table to determine the calibration voltage that the relay should output according to the control instruction currently received by the relay, and then compare the calibration voltage with the relay voltage to determine whether they are the same or whether the error between them is within a preset error range, thereby determining the running state of the relay.

[0051] Step S108: outputting the system state of the battery high-voltage system based on the multiple running states.

[0052] In an alternative of the embodiment, after obtaining the respective running states of the multiple relays, the system state of the battery high-voltage system can be determined according to the corresponding running states.

[0053] In an alternative of the embodiment, considering that the system state of the battery high-voltage system is one of the important factors affecting the safety during the driving of the vehicle, the system state of the battery high-voltage system needs to be ensured to be normal at all times, therefore, when determining the system state of the battery high-voltage system based on the multiple running states, it is required to ensure that the multiple running states are all normal running states of the relays, so as to determine that the system state of the battery high-voltage system is normal, otherwise, the system state is abnormal. After determining the system state of the battery high-voltage system, the monitoring system can output the system state for the staff or user to check.

[0054] In the embodiment, the running state of the preset voltage sampling module and the multiple relay identifiers of the multiple relays in the battery high-voltage system are obtained; in response to the normal running of the preset voltage sampling module, the multiple relays are voltage-sampled based on the preset voltage sampling module and the multiple relay identifiers, to obtain multiple relay voltages; the multiple running states of the multiple relays are determined based on the multiple relay voltages and the total voltage of the battery in the battery high-voltage system; and the system state of the battery high-voltage system is output based on the multiple running states. In this way, the running states of the multiple relays are determined respectively based on the total voltage of the battery in the battery high-voltage system and the multiple relay voltages, which reduces the error when the running state of the relay is determined directly based on the relay voltage, improves the accuracy of the determined running state of the relay, and then determines the system state of the battery high-voltage system based on the running states of the multiple relays with higher accuracy, thereby further improving the accuracy of the determined system state, and solving the technical problem of low monitoring accuracy of the battery high-voltage system in the related art.

[0055] Optionally, voltage sampling is performed on the multiple relays based on the preset voltage sampling module and the multiple relay identifiers to obtain multiple relay voltages, including: controlling the disconnection of the multiple relays; determining the voltage sampling sequence between the multiple relay identifiers from a preset identifier sequence table, wherein the preset identifier sequence table is used to represent the mapping relationship between the relay identifier and the voltage sampling sequence; and voltage sampling is performed on the multiple relays in the voltage sampling sequence based on the preset voltage sampling module to obtain the multiple relay voltages.

[0056] The preset identification order table can be a mapping relationship table capable of representing the identification of different relays and the voltage sampling order of different relays. In an optional solution of the embodiment, when configuring the battery high-voltage system, the staff can record and mark the loop connection relationship of the battery high-voltage system in real time. The relationship can represent the logical positions of the multiple relays in the loop and the corresponding voltage sampling order. The monitoring system can quickly obtain the preset identification order table from the corresponding database according to the model of the battery high-voltage system.

[0057] In an optional solution of the embodiment, in order to ensure the rationality of obtaining the multiple relay voltages, when the preset voltage sampling module is used to sample the voltages of the multiple relays according to the multiple relay identifications, the monitoring system can first control the working states of the multiple relays to be uniform, for example, to control the multiple relays to be all closed or all disconnected. Taking the case that the multiple relays are controlled to be all disconnected as an example, considering that the connection modes and operation logics of different relays are different, therefore, before sampling the voltages of the relays, the logical order of sampling the voltages of different relays can be determined according to the multiple relay identifications of the multiple relays. For example, the preset identification order table can be used to quickly determine the logical order of sampling the voltages of different relays, and then the preset voltage sampling module is used to sample the voltages of the multiple relays according to the obtained voltage sampling order, so as to obtain the multiple relay voltages.

[0058] Alternatively, the multiple relays at least include a high-voltage positive relay, a pre-charging relay, a high-voltage negative relay, and a charging negative relay. The voltage sampling order of the pre-charging relay is after the voltage sampling order of the high-voltage positive relay. The voltage sampling order of the high-voltage negative relay is after the voltage sampling order of the pre-charging relay. The voltage sampling order of the charging negative relay is after the voltage sampling order of the high-voltage negative relay. The preset voltage sampling module at least includes a first reference ground sampling module and a second reference ground sampling module. The reference ground sampling loop corresponding to the first reference ground sampling module includes the high-voltage positive relay and the pre-charging relay. The reference ground sampling loop corresponding to the second reference ground sampling module includes the high-voltage negative relay and the charging negative relay.

[0059] In an optional solution of the embodiment, in order to ensure the applicability of monitoring the high-voltage system, the multiple relays can at least include a high-voltage positive relay, a pre-charging relay, a high-voltage negative relay, and a charging negative relay. The voltage sampling order corresponding to the multiple relays is that the voltage sampling order of the pre-charging relay is after the voltage sampling order of the high-voltage positive relay, the voltage sampling order of the high-voltage negative relay is after the voltage sampling order of the pre-charging relay, and the voltage sampling order of the charging negative relay is after the voltage sampling order of the high-voltage negative relay.

[0060] Correspondingly, as shown in the foregoing, in order to ensure the accuracy of the preset voltage sampling module, the preset voltage sampling module can at least include a first reference ground sampling module and a second reference ground sampling module, wherein the corresponding reference ground sampling loop of the first reference ground sampling module includes a high-voltage positive relay and a pre-charge relay, and the corresponding reference ground sampling loop of the second reference ground sampling module includes a high-voltage negative relay and a charging negative relay. The power supply module can include a first power supply module and a second power supply module, wherein the first power supply module can provide power supply for the first reference ground sampling module, and the second power supply module can provide power supply for the second reference ground sampling module.

[0061] In order to facilitate understanding of the process of monitoring the battery high-voltage system, Figure 2 is a schematic diagram of a battery high-voltage system structure according to an embodiment of the present application, as Figure 2 shown, the left side of the battery high-voltage system is a voltage input end, and the right side is a load end. The battery high-voltage system can include a relay working part, an insulation detection part, and a load port part. The battery high-voltage system includes: a plurality of relays: a high-voltage positive relay, a pre-charge relay, a high-voltage negative relay, and a charging negative relay; a plurality of voltage dividing resistors: R1-R15, Rn, Rp, pre-charge resistor, etc.; a plurality of control switches: K1 and K2; a plurality of shunt capacitors: X1, Y1, Y2; and a diode D1. In the battery high-voltage system, a plurality of voltages: V1-P, V2-P, V3-P, V4-D, V5-E, V6-D, etc. can be quickly collected. The ground end of the high-voltage system can be the ground end of the test vehicle.

[0062] In an optional solution of the embodiment, the control switch can include two types, which are isolation switch and non-isolation switch. The isolation switch can include but is not limited to photoelectric switch, relay, etc. The control signal output by the low-voltage MCU (Microcontroller Unit) can be used to control the switch state. The non-isolation switch can be a MOS tube (positive channel Metal Oxide Semiconductor, pmos tube line), which can be controlled by the control signal corresponding to the reference ground where the switch is located. The control signal can be issued by the monitoring system or the MCU signal processed by the high-low voltage signal isolation module.

[0063] Optionally, based on the preset voltage sampling module, the multiple relays are sampled in voltage sampling sequence to obtain multiple relay voltages, including: based on the first reference ground sampling module, sampling the front contact of the high-voltage positive relay to obtain the first positive relay voltage; based on the first reference ground sampling module, sampling the back contact of the high-voltage positive relay to obtain the second positive relay voltage; based on the first reference ground sampling module, sampling the back contact contained in the pre-charge relay to obtain the pre-charge relay voltage; based on the second reference ground sampling module, sampling the back contact contained in the high-voltage negative relay to obtain the first negative relay voltage; based on the second reference ground sampling module, sampling the back contact contained in the charging negative relay to obtain the second negative relay voltage.

[0064] In an optional solution of the embodiment, the back contact of the relay can be sampled to determine the respective relay voltage of the relay. Considering that the front contact of the high-voltage positive relay is connected with the voltage input end of the battery high-voltage system, the total voltage of the battery high-voltage system can be determined by sampling the voltage of the front contact of the high-voltage positive relay. Therefore, when collecting multiple relay voltages by using the preset voltage sampling module, the first reference ground sampling module can be used to sample the front contact of the high-voltage positive relay in the voltage sampling sequence to obtain the first positive relay voltage, and then the first reference ground sampling module can be used to sample the back contact of the high-voltage positive relay to obtain the second positive relay voltage, and then the first reference ground sampling module can be used to sample the back contact contained in the pre-charge relay to obtain the pre-charge relay voltage, and then the second reference ground sampling module can be used to sample the back contact contained in the high-voltage negative relay to obtain the first negative relay voltage, and finally the second reference ground sampling module can be used to sample the back contact contained in the charging negative relay to obtain the second negative relay voltage.

[0065] It should be noted that the above-mentioned collection of the voltage of the front contact of the high-voltage positive relay to determine the total resistance of the battery is an exemplary display, and the voltage used to determine the total resistance of the battery can be determined according to actual conditions, which is not limited herein.

[0066] Optionally, the multiple operating states of the multiple relays are determined based on the multiple relay voltages and the total battery voltage, including: obtaining component features of multiple voltage dividing components used for dividing the total battery voltage, and the total battery voltage, wherein the total battery voltage is determined based on the first positive relay voltage and a first resistance value of a first voltage dividing resistor in the multiple voltage dividing components; determining the multiple operating states of the multiple first relays based on the total battery voltage and multiple first relay voltages of the multiple first relays included in a first preset loop in the battery high-voltage system; and determining the multiple operating states of the multiple second relays based on the component features and multiple second relay voltages of the multiple second relays included in a second preset loop in the battery high-voltage system.

[0067] The component features of the voltage dividing components can refer to types, sizes, and other features of the voltage dividing components, such as the size of the resistor R1 and the size of the capacitor X1. The first voltage dividing component can refer to a voltage dividing component used for determining the total battery voltage according to a voltage dividing rule of the relay voltage and the loop voltage, such as the resistors R5 and R6 in the first preset loop. Figure 2 The first preset loop can refer to a loop connected to a voltage input end of the battery high-voltage system, and the second preset loop can refer to a loop other than the first preset loop in the battery high-voltage system

[0068] In an optional solution of the embodiment, when determining the operating states of the multiple relays, the monitoring system can first obtain the multiple voltage dividing components used for dividing the multiple total battery voltages, i.e., the voltage dividing components in the first preset loop and the second preset loop. Figure 2 The multiple resistors and multiple capacitors in the loop, and the component features of the multiple voltage dividing components, are used to determine the total battery resistance of the battery high-voltage system according to the first positive relay and the first voltage dividing component in the voltage dividing components, i.e., the voltage determined based on the first positive relay voltage and the first resistance value of the first voltage dividing resistor.

[0069] Then, the operating states of the different relays can be determined according to the voltage dividing rules of the loops in which the different relays are located, such as the operating states of the multiple first relays determined based on the total battery voltage and the first relay voltages of the multiple first relays included in the first preset loop, and the operating states of the multiple second relays determined based on the component features and the second relay voltages of the multiple second relays included in the second preset loop.

[0070] Optionally, the plurality of first relays include a high-voltage positive relay and a pre-charge relay, and the plurality of first relay voltages include a second positive relay voltage and a pre-charge relay voltage. The determining of the plurality of operating states of the plurality of first relays is based on the total voltage of the battery, and the plurality of first relay voltages of the plurality of first relays included in the first preset circuit in the high-voltage system. The determining of the plurality of operating states of the plurality of first relays includes: obtaining a first difference between the total voltage of the battery and the second positive relay voltage, and a second difference between the total voltage of the battery and the pre-charge relay voltage; determining, based on the first difference and a first sticking voltage range, whether the operating state of the high-voltage positive relay is that the high-voltage positive relay sticks; and determining, based on the second difference and a second sticking voltage range, whether the operating state of the pre-charge relay is that the pre-charge relay sticks.

[0071] As can be seen from Figure 2 , the plurality of first relays included in the first preset circuit can include a high-voltage positive relay and a pre-charge relay, and the corresponding plurality of first relay voltages can include a second positive relay voltage and a pre-charge relay voltage.

[0072] In the determining of the plurality of operating states of the plurality of first relays, the monitoring system can first obtain a first difference between the total voltage of the battery and the second positive relay voltage, and a second difference between the total voltage of the battery and the pre-charge relay voltage, and then determine, based on the first difference and the second difference, the operating states of the high-voltage positive relay and the pre-charge relay, i.e., whether the high-voltage positive relay and the pre-charge relay stick.

[0073] If the first difference is within a preset first sticking voltage range, it can be determined that the high-voltage positive relay sticks. If the first difference is not within the preset first sticking voltage range, it can be determined that the high-voltage positive relay does not stick. If the second difference is within a preset second sticking voltage range, it can be determined that the pre-charge relay sticks. If the second difference is not within the preset second sticking voltage range, it can be determined that the pre-charge relay does not stick.

[0074] It should be noted that the first sticking range and the second sticking range can be obtained by a worker by pre-testing the high-voltage positive relay and the pre-charge relay, and the specific testing process is not limited herein.

[0075] Optionally, the plurality of second relays comprises a high-voltage negative relay and a charging negative relay, the plurality of second relay voltages comprises a first negative relay voltage and a second negative relay voltage, the voltage dividing assembly further comprises a second voltage dividing resistor in a loop where the high-voltage negative relay is located, and a diode in a loop where the charging negative relay is located, the assembly features comprises a second resistance value of the second voltage dividing resistor and a forward voltage of the diode, and based on the assembly features and the plurality of second relay voltages of the plurality of second relays contained in the second preset loop in the high-voltage system, the plurality of operating states of the plurality of second relays are determined, comprising: determining a third negative relay voltage based on the first negative relay voltage and the second resistance value; determining whether the high-voltage negative relay is stuck based on a third difference value between the third negative relay voltage and the total voltage of the battery and a third sticking voltage range; and determining whether the charging negative relay is stuck based on a fourth difference value between the second negative relay voltage and the forward voltage and a fourth sticking voltage range.

[0076] As can be seen from Figure 2 , the plurality of second relays contained in the second preset loop can comprise a high-voltage negative relay and a charging negative relay, the corresponding plurality of second relay voltages can comprise a first negative relay voltage and a second negative relay voltage, and the corresponding voltage dividing assembly can comprise a second voltage dividing resistor in a loop where the high-voltage negative relay is located, such as R13 and R14 in Figure 2 , and a diode in a loop where the charging negative relay is located, such as D1 in Figure 2 , and the assembly features comprises a second resistance value of the second voltage dividing resistor and a forward voltage of the diode.

[0077] In determining the plurality of operating states of the plurality of second relays, the monitoring system can first determine a variable third negative relay voltage according to the first negative relay voltage and the second resistance value, then compare a third difference value between the third negative relay voltage and the total voltage of the battery with a third sticking voltage range, and compare a fourth difference value between the second negative relay voltage and the forward voltage with a fourth sticking voltage range, so as to determine whether the second relays, i.e. the high-voltage negative relay and the pre-charging negative relay, are stuck.

[0078] If the third difference value is within the preset third sticking voltage range, it can be determined that the high-voltage negative relay is stuck; if the third difference value is not within the preset third sticking voltage range, it can be determined that the high-voltage negative relay is not stuck; if the fourth difference value is within the preset fourth sticking voltage range, it can be determined that the charging negative relay is stuck; if the fourth difference value is not within the preset fourth sticking voltage range, it can be determined that the charging negative relay is not stuck.

[0079] It should be noted that the third and fourth adhesion ranges can be obtained by the staff through adhesion tests on the high-voltage negative relay and the charging negative relay in advance, and the specific test process is not limited here.

[0080] Optionally, the system state of the battery high-voltage system is output based on a plurality of operating states, including: in response to the operating state of the plurality of relays not being adhesion of the plurality of relays, controlling the plurality of relays to work based on a working control sequence of the plurality of relays; obtaining a load end voltage corresponding to the plurality of relays after working, and a first output end voltage of the battery high-voltage system; determining a second output end voltage based on the load end voltage and a third resistance value of a third voltage dividing resistor, wherein the third voltage dividing resistor is used to represent a voltage dividing resistor connected to the load end of the battery high-voltage system; and in response to the first output end voltage and the second output end voltage satisfying a preset voltage condition, determining that the system state is normal for the battery high-voltage system.

[0081] In an optional solution of the embodiment, when outputting the system state of the battery high-voltage system, the system state can be further determined. In addition to the system state when the operating state of the plurality of relays is all normal, which is determined as normal for the battery high-voltage system, the system state can also be determined according to the output voltage of the load end of the battery high-voltage system after the plurality of relays are controlled to work in a preset connection mode, thereby further improving the accuracy of the determined system state.

[0082] Specifically, when the operating state of the plurality of relays is determined to be non-adhesion of the relays, the monitoring system can control the plurality of relays to work in sequence according to the working sequence of the plurality of relays, and then obtain the load end voltage corresponding to the plurality of relays after working, and the first output end voltage of the output end of the battery high-voltage system, i.e. Figure 2 the load end output of the second output end, and then use the third voltage dividing resistor connected to the load end in the loop where the first output end is located, such as R15 and R16 in Figure 2 , to divide the load end voltage obtained above, to determine the output voltage after processing by the plurality of relays, i.e. the second output end voltage, and finally determine the system state according to whether the first output end voltage and the second output end voltage satisfy a preset voltage condition, such as whether they are the same, or whether the error between them is less than a preset error threshold, etc.

[0083] In an optional solution of the embodiment, if the first output terminal voltage and the second output terminal voltage satisfy the preset voltage condition, it can be considered that the system state is that the battery high-voltage system can normally operate, and the monitoring system can output the system state; if the running state of the at least one relay is that the relay is stuck, or the first output terminal voltage and the second output terminal voltage do not satisfy the preset voltage condition, it can be considered that the system state is that the battery high-voltage system is abnormal and cannot normally operate, and the monitoring system can output the system state and send an alarm information to the staff or user, so that the staff or user can timely troubleshoot the abnormal reason, and the safety of the vehicle during control driving is improved.

[0084] Optionally, based on the working control sequence of the plurality of relays, the plurality of relays are controlled to work, including: controlling the high-voltage negative relay to close; in response to successful closing of the high-voltage negative relay, controlling the pre-charging relay to close; in response to successful closing of the pre-charging relay and successful pre-charging of the load end of the battery high-voltage system, controlling the high-voltage positive relay to close and controlling the pre-charging relay to disconnect.

[0085] In an optional solution of the embodiment, when the plurality of relays are controlled to work according to the working control sequence, the high-voltage negative relay can be first controlled to close, after successful closing of the high-voltage negative relay, the pre-charging relay is controlled to close, and then after successful closing of the pre-charging relay and successful pre-charging of the load end of the battery high-voltage system, the monitoring system can control the high-voltage positive relay to close and simultaneously disconnect the pre-charging relay.

[0086] In order to facilitate understanding of the above process, Figure 3 is a schematic diagram of a battery high-voltage system monitoring process according to an embodiment of the application, as Figure 3 shown, the whole process of monitoring the battery high-voltage system can include: first, initializing the battery high-voltage system to power on, then comparing the accumulated sum of the battery total voltage and the cell voltage collected, judging whether the connection of each port of the battery is faulty, then in the case of no fault, the relay voltages of the high-voltage positive relay, the pre-charging relay, the high-voltage negative relay and the charging negative relay are sequentially collected, and the plurality of relay voltages are compared with the battery total voltage to determine whether the plurality of relays are faulty, for example, stuck, in the case of no fault, the operations of closing the high-voltage negative relay, closing the pre-charging relay, closing the high-voltage positive relay and disconnecting the pre-charging relay are sequentially performed to determine whether the system state of the battery high-voltage system is normal, if the system state is normal, it can be determined that the battery high-voltage system is powered on and the system state is output; if the system state is not normal, the battery high-voltage system can be diagnosed for fault and the diagnosis result is output.

[0087] Embodiment 2

[0088] According to another aspect of the embodiments of the present application, corresponding to the above-mentioned method for monitoring the battery high-voltage system, the present specification also provides a device for monitoring the battery high-voltage system, please refer to Figure 4 , Figure 4 is a structural block diagram of a device for monitoring the battery high-voltage system according to the embodiments of the present application, as shown in Figure 4 , the device comprises an acquisition module 402, a sampling module 404, a determination module 406 and an output module 408.

[0089] The acquisition module 402 is configured to acquire the running state of the preset voltage sampling module and a plurality of relay identifiers of the plurality of relays in the battery high-voltage system; the sampling module 404 is configured to, in response to the normal running of the preset voltage sampling module, sample the voltage of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers, to obtain a plurality of relay voltages; the determination module 406 is configured to determine a plurality of running states of the plurality of relays based on the plurality of relay voltages and a total voltage of the battery high-voltage system, wherein the total voltage of the battery high-voltage system is a voltage obtained by converting the relay voltages according to a loop voltage division rule; and the output module 408 is configured to output a system state of the battery high-voltage system based on the plurality of running states.

[0090] Optionally, the sampling module 404 comprises a disconnecting unit configured to control the disconnection of the plurality of relays; a sequential determination module configured to determine a voltage sampling sequence between the plurality of relay identifiers from a preset identifier sequence table, wherein the preset identifier sequence table is configured to represent a mapping relationship between the relay identifiers and the voltage sampling sequence; and a sampling unit configured to sample the voltage of the plurality of relays according to the voltage sampling sequence based on the preset voltage sampling module, to obtain the plurality of relay voltages.

[0091] Optionally, the plurality of relays at least comprises a high-voltage positive relay, a pre-charging relay, a high-voltage negative relay and a charging negative relay, the voltage sampling sequence of the pre-charging relay is after the voltage sampling sequence of the high-voltage positive relay, the voltage sampling sequence of the high-voltage negative relay is after the voltage sampling sequence of the pre-charging relay, the voltage sampling sequence of the charging negative relay is after the voltage sampling sequence of the high-voltage negative relay, and the preset voltage sampling module at least comprises a first reference ground sampling module and a second reference ground sampling module, the reference ground sampling loop corresponding to the first reference ground sampling module comprises the high-voltage positive relay and the pre-charging relay, and the reference ground sampling loop corresponding to the second reference ground sampling module comprises the high-voltage negative relay and the charging negative relay.

[0092] Optionally, the sampling unit is further configured to: sample, based on the first reference ground sampling module, a front contact of the high-voltage positive relay to obtain a first positive relay voltage; sample, based on the first reference ground sampling module, a back contact of the high-voltage positive relay to obtain a second positive relay voltage; sample, based on the first reference ground sampling module, a back contact included in the pre-charge relay to obtain a pre-charge relay voltage; sample, based on the second reference ground sampling module, a back contact included in the high-voltage negative relay to obtain a first negative relay voltage; and sample, based on the second reference ground sampling module, a back contact included in the charging negative relay to obtain a second negative relay voltage.

[0093] Optionally, the determining module 406 includes: a feature acquisition unit configured to acquire component features of a plurality of voltage-dividing components used to divide a total voltage of the battery, and the total voltage of the battery, wherein the total voltage of the battery is a voltage determined based on the first positive relay voltage and a first resistance value of a first voltage-dividing resistor in the plurality of voltage-dividing components; a first state determining unit configured to determine a plurality of operating states of a plurality of first relays included in a first preset loop in the high-voltage system of the battery based on the total voltage of the battery and a plurality of first relay voltages of the plurality of first relays; and a second state determining unit configured to determine a plurality of operating states of a plurality of second relays included in a second preset loop in the high-voltage system of the battery based on the component features and a plurality of second relay voltages of the plurality of second relays.

[0094] Optionally, the plurality of first relays includes a high-voltage positive relay and a pre-charge relay, and the plurality of first relay voltages includes a second positive relay voltage and a pre-charge relay voltage, and the first state determining unit is further configured to: acquire a first difference between the total voltage of the battery and the second positive relay voltage, and a second difference between the total voltage of the battery and the pre-charge relay voltage; determine, based on the first difference and a first sticking voltage range, whether the operating state of the high-voltage positive relay is that the high-voltage positive relay has stuck; and determine, based on the second difference and a second sticking voltage range, whether the operating state of the pre-charge relay is that the pre-charge relay has stuck.

[0095] Optionally, the plurality of second relays comprises a high-voltage negative relay and a charging negative relay, the plurality of second relay voltages comprises a first negative relay voltage and a second negative relay voltage, the voltage dividing assembly further comprises a second voltage dividing resistor in a loop in which the high-voltage negative relay is located, and a diode in a loop in which the charging negative relay is located, the assembly features comprise a second resistance value of the second voltage dividing resistor and a forward voltage drop of the diode, and the second state determination unit is further configured to: determine a third negative relay voltage based on the first negative relay voltage and the second resistance value; determine whether the high-voltage negative relay is stuck based on a third difference value between the third negative relay voltage and the total voltage of the battery and a third sticking voltage range, and determine whether the charging negative relay is stuck based on a fourth difference value between the second negative relay voltage and the forward voltage drop and a fourth sticking voltage range.

[0096] Optionally, the output module 408 comprises a control unit configured to control the plurality of relays to work based on a working control sequence of the plurality of relays in response to the working states of the plurality of relays not being that the plurality of relays are stuck, a voltage acquisition unit configured to acquire a load end voltage corresponding to the plurality of relays after working and a first output end voltage of the battery high-voltage system, a voltage determination unit configured to determine a second output end voltage based on the load end voltage and a third resistance value of a third voltage dividing resistor, wherein the third voltage dividing resistor is used to represent a voltage dividing resistor connected to a load end of the battery high-voltage system, and a third state determination unit configured to determine that the system state is normal in response to the first output end voltage and the second output end voltage satisfying a preset voltage condition.

[0097] Optionally, the control unit is further configured to: control the high-voltage negative relay to be closed; control the pre-charging relay to be closed in response to the high-voltage negative relay being successfully closed; control the high-voltage positive relay to be closed and the pre-charging relay to be disconnected in response to the pre-charging relay being successfully closed and the load end of the battery high-voltage system being successfully pre-charged.

[0098] Embodiment 3

[0099] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which comprises a stored program, wherein the program, when executed, controls a device in which the computer readable storage medium is located to perform any one of the above-mentioned battery high-voltage system monitoring methods.

[0100] Embodiment 4

[0101] According to another aspect of the embodiments of the present application, a processor is also provided, which is configured to execute a program, wherein the program, when executed, performs any one of the above-mentioned battery high-voltage system monitoring methods.

[0102] Embodiment 5

[0103] According to another aspect of the embodiments of the present application, there is also provided a vehicle, comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any of the above-mentioned battery high-voltage system monitoring methods.

[0104] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0105] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0106] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-mentioned device embodiments are only schematic, for example, the division of units can be a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, and can be electrical or other forms.

[0107] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0108] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0109] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0110] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A method of monitoring a battery high voltage system, characterized by, The method comprises: acquiring a running state of a preset voltage sampling module and a plurality of relay identifiers of a plurality of relays in a battery high-voltage system; in response to the preset voltage sampling module being in normal operation, sampling voltages of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers to obtain a plurality of relay voltages; determining a plurality of running states of the plurality of relays based on the plurality of relay voltages and a total voltage of the battery high-voltage system, wherein the total voltage of the battery high-voltage system is a voltage obtained by converting the relay voltages according to a loop voltage division rule; outputting a system state of the battery high-voltage system based on the plurality of running states; wherein the sampling of the voltages of the plurality of relays based on the preset voltage sampling module and the plurality of relay identifiers to obtain the plurality of relay voltages comprises: controlling disconnection of the plurality of relays; determining a voltage sampling sequence between the plurality of relay identifiers from a preset identifier sequence table, wherein the preset identifier sequence table is used to represent a mapping relationship between the relay identifiers and the voltage sampling sequence; and sampling the voltages of the plurality of relays in the voltage sampling sequence based on the preset voltage sampling module to obtain the plurality of relay voltages; the plurality of relays at least include a high-voltage positive relay, a pre-charging relay, a high-voltage negative relay, and a charging negative relay, the voltage sampling sequence of the pre-charging relay is after the voltage sampling sequence of the high-voltage positive relay, the voltage sampling sequence of the high-voltage negative relay is after the voltage sampling sequence of the pre-charging relay, the voltage sampling sequence of the charging negative relay is after the voltage sampling sequence of the high-voltage negative relay, and the preset voltage sampling module at least includes a first reference ground sampling module and a second reference ground sampling module, a reference ground sampling loop corresponding to the first reference ground sampling module includes the high-voltage positive relay and the pre-charging relay, and a reference ground sampling loop corresponding to the second reference ground sampling module includes the high-voltage negative relay and the charging negative relay; the sampling of the voltages of the plurality of relays in the voltage sampling sequence based on the preset voltage sampling module to obtain the plurality of relay voltages comprises: sampling a front contact of the high-voltage positive relay based on the first reference ground sampling module to obtain a first positive relay voltage; sampling a rear contact of the high-voltage positive relay based on the first reference ground sampling module to obtain a second positive relay voltage; sampling a rear contact included in the pre-charging relay based on the first reference ground sampling module to obtain a pre-charging relay voltage; sampling a rear contact included in the high-voltage negative relay based on the second reference ground sampling module to obtain a first negative relay voltage; and sampling a rear contact included in the charging negative relay based on the second reference ground sampling module to obtain a second negative relay voltage.

2. The method of claim 1, wherein, determining the plurality of running states of the plurality of relays based on the plurality of relay voltages and the total voltage of the battery high-voltage system comprises: obtaining component features of a plurality of voltage dividing components for dividing a total voltage of the battery, and the total voltage of the battery, wherein the total voltage of the battery is determined based on the first positive relay voltage and a first resistance value of a first voltage dividing resistor in the plurality of voltage dividing components; determining a plurality of operating states of a plurality of first relays in a first preset loop in the high-voltage system based on the total voltage of the battery and a plurality of first relay voltages of the plurality of first relays; determining a plurality of operating states of a plurality of second relays in a second preset loop in the high-voltage system based on the component features and a plurality of second relay voltages of the plurality of second relays.

3. The method of claim 2, wherein, The plurality of first relays includes the high-voltage positive relay and the pre-charge relay, and the plurality of first relay voltages includes the second positive relay voltage and the pre-charge relay voltage. Determining the plurality of operating states of the plurality of first relays based on the total voltage of the battery and the plurality of first relay voltages of the plurality of first relays in the first preset loop in the high-voltage system includes: obtaining a first difference between the total voltage of the battery and the second positive relay voltage, and a second difference between the total voltage of the battery and the pre-charge relay voltage; determining whether the high-voltage positive relay is stuck based on the first difference, the first sticking voltage range, and the operating state of the high-voltage positive relay; determining whether the pre-charge relay is stuck based on the second difference, the second sticking voltage range, and the operating state of the pre-charge relay.

4. The method of claim 2, wherein, The plurality of second relays includes the high-voltage negative relay and the charging negative relay, and the plurality of second relay voltages includes the first negative relay voltage and the second negative relay voltage. The plurality of voltage dividing components further includes a second voltage dividing resistor in the loop where the high-voltage negative relay is located, and a diode in the loop where the charging negative relay is located. The component features include a second resistance value of the second voltage dividing resistor and a drop voltage of the diode. Determining the plurality of operating states of the plurality of second relays based on the component features and the plurality of second relay voltages of the plurality of second relays in the second preset loop in the high-voltage system includes: determining a third negative relay voltage based on the first negative relay voltage and the second resistance value; determining whether the high-voltage negative relay is stuck based on a third difference between the third negative relay voltage and the total voltage of the battery, a third sticking voltage range, and the operating state of the high-voltage negative relay; determining whether the charging negative relay is stuck based on a fourth difference between the second negative relay voltage and the drop voltage of the diode, a fourth sticking voltage range, and the operating state of the charging negative relay.

5. The method of claim 1, wherein, outputting a system state of the high-voltage system of the battery based on the plurality of operating states includes: controlling the plurality of relays to work based on a working control sequence of the plurality of relays in response to the operating state of the plurality of relays not being that the plurality of relays are stuck. acquire a load end voltage corresponding to the plurality of relays after the working, and a first output end voltage of the battery high-voltage system; determine a second output end voltage based on the load end voltage and a third resistance value of a third voltage dividing resistor, wherein the third voltage dividing resistor is used to represent a voltage dividing resistor connected to a load end of the battery high-voltage system; determine that the system state is normal for the battery high-voltage system in response to the first output end voltage and the second output end voltage satisfying a preset voltage condition.

6. The method of claim 5, wherein, control the plurality of relays to work based on a working control sequence of the plurality of relays, including: control the high-voltage negative relay to close; control a pre-charging relay to close in response to the high-voltage negative relay closing successfully; control the high-voltage positive relay to close and control the pre-charging relay to open in response to the pre-charging relay closing successfully and pre-charging the load end of the battery high-voltage system successfully.

7. A vehicle, comprising: at least one processor; and a memory connected to the at least one processor in communication; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the monitoring method of the battery high-voltage system according to any one of claims 1 to 6.

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