Single sampling exception handling method and system

Abstract

The invention provides a monomer sampling abnormity processing method. The monomer sampling abnormity processing method comprises the following steps: sampling voltage values of monomer cells in a battery pack; judging whether the voltage values of two adjacent single battery cells in the battery pack conform to abnormal characteristics or not; when the voltage values of the two adjacent single cells conform to the abnormal characteristics, judging the type of the battery pack in the sampling abnormal state according to the voltage values of the two adjacent single cells conforming to the abnormal characteristics; according to the judgment result, sampling abnormity processing is conducted on the voltage values of the two adjacent single battery cells meeting the abnormal characteristics, the driving experience of a terminal user is ensured, the performance continuity, stability and reliability of a battery pack are enhanced, a processing mechanism under the single sampling abnormity condition is optimized, and safety and performance are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery fault processing, and in particular to a method and system for processing abnormal cell sampling. Background Art

[0002] Today's new energy passenger vehicle market has gradually matured in terms of functionality, durability and reliability. However, with the long-term use of vehicles, some problems such as hardware aging and damage have emerged one after another.

[0003] At present, there are usually three states of single-cell sampling abnormalities in the BMS (BATTERY MANAGEMENT SYSTEM) of a battery pack: a sampling line disconnection fault state of a single cell in the battery pack, a virtual connection or momentary disconnection fault state of a sampling line of a single cell in the battery pack, and an abnormal BMS sampling circuit. Among them, the detection means and processing methods for the BMS sampling circuit abnormality are relatively mature, but the judgment of the sampling line disconnection fault state, virtual connection or momentary disconnection fault state of a single cell in the battery pack is not accurate enough, which will affect the user experience. Summary of the invention

[0004] The purpose of the present invention is to provide a method for handling single-unit sampling anomalies, and to optimize the handling mechanism under single-unit sampling anomalies.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for handling single cell sampling anomalies, comprising the following steps: sampling the voltage values ​​of single cells in a battery pack; judging whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics; when there are two adjacent single cells whose voltage values ​​meet the abnormal characteristics, judging the type of sampling abnormal state of the battery pack according to the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics; and performing sampling anomaly handling on the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics according to the judgment result.

[0006] Furthermore, the sampling abnormality processing of the voltage values ​​of two adjacent single battery cells that meet the abnormal characteristics based on the judgment result includes: when it is judged that the battery pack is in a first sampling abnormal state, increasing the sampling filter time, and assigning values ​​to the voltages of the two single battery cells that meet the abnormal characteristics, the first sampling abnormal state being a sampling line virtual connection abnormal state; when it is judged that the battery pack is not in the first sampling abnormal state, judging whether the battery pack is in a thermal runaway state; when the battery pack is not in a thermal runaway state, judging whether the battery pack is in a second sampling abnormal state, the second sampling abnormal state being a sampling line broken abnormal state; when the battery pack is in a sampling line broken abnormal state, discarding the collected voltage values ​​of the two adjacent single battery cells that meet the abnormal characteristics.

[0007] Furthermore, the method of determining whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics includes: obtaining a first voltage α of the single cell with the lowest voltage in the battery pack; obtaining a second voltage θ of a single cell in the battery pack that is positively adjacent to the single cell with the lowest voltage; obtaining a third voltage λ of the single cell with the highest voltage in the battery pack; determining whether the second voltage θ is equal to the third voltage λ; when the second voltage θ is equal to the third voltage λ, determining that there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics.

[0008] Furthermore, the type of determining whether the battery pack is in a sampling abnormal state based on the voltage values ​​of two adjacent single cells that meet the abnormal characteristics includes: determining whether the first voltage α is less than or equal to a preset minimum voltage, and determining whether the second voltage θ is greater than or equal to a preset maximum voltage; when the first voltage α is greater than the preset minimum voltage and / or the second voltage θ is less than the maximum preset voltage, then determining that the battery pack is in the first sampling abnormal state.

[0009] Further, the voltage assignment of the two single cells that meet the abnormal characteristics includes: obtaining a first average voltage X of all the single cells in the battery pack except the two single cells that meet the abnormal characteristics; obtaining a second average voltage Y of all the single cells in the battery pack except the two single cells that meet the abnormal characteristics when the voltage values ​​of the single cells in the battery pack were last collected; calculating a difference Δ between the voltage values ​​of the two single cells that meet the abnormal characteristics and the second average voltage Y when the voltage values ​​of the single cells in the battery pack were last collected; and assigning the voltage values ​​of the two single cells that meet the abnormal characteristics according to the difference Δ and the first average voltage X.

[0010] Furthermore, after assigning the voltages of two adjacent single-cell batteries that meet the abnormal characteristics, the following steps are also included: setting a first detection delay time; determining whether the battery pack is still in the first sampling abnormal state after the first detection delay time; and when the battery pack is still in the first sampling abnormal state, outputting first abnormal fault information, wherein the first abnormal fault information is used to indicate a sampling line virtual connection abnormal fault.

[0011] Furthermore, the determination of whether the battery pack is in a thermal runaway state includes: setting a temperature threshold; obtaining detection values ​​of all temperature sensors on the battery module where two single cells meeting the abnormal characteristics are located; determining whether the detection value of the temperature sensor is greater than the temperature threshold; when the detection value of the temperature sensor is greater than the temperature threshold, determining that the battery pack is in a thermal runaway state.

[0012] Furthermore, the determination of whether the battery pack is in the second sampling abnormal state includes: setting a first filtering sampling time; setting the sampling filtering time of the voltage value of the single cell in the battery pack to the first filtering sampling time; setting a second detection delay time; after the second detection delay time, determining whether the first voltage α is less than a preset minimum voltage, and determining whether the second voltage θ is greater than a preset maximum voltage; when the first voltage α is less than the preset minimum voltage and the second voltage θ is greater than the preset maximum voltage, determining that the battery pack is in the second sampling abnormal state.

[0013] Furthermore, after eliminating the collected voltage values ​​of two adjacent single cells that meet the abnormal characteristics, the following steps are also included: confirming the voltage values ​​of the two single cells that meet the abnormal characteristics that were collected last time as valid values; using the valid values ​​as the voltage values ​​of the two single cells that meet the abnormal characteristics; setting a second detection delay time; determining whether the battery pack is still in the second sampling abnormal state after the second detection delay time; and when the battery pack is still in the second sampling abnormal state, outputting second fault information, wherein the second fault information is used to indicate a sampling line break abnormal fault.

[0014] On the other hand, a single cell sampling abnormality processing system is provided, comprising: a voltage sampling module for sampling the voltage value of a single cell in a battery pack; a voltage abnormality judgment module for judging whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics; an abnormal state judgment module for judging the type of sampling abnormal state of the battery pack according to the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics when there are two adjacent single cells whose voltage values ​​meet the abnormal characteristics; and an abnormality processing module for performing sampling abnormality processing on the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics according to the judgment result.

[0015] From the analysis, it can be seen that the present invention discloses a method and system for handling abnormal single-cell sampling, which ensures the driving experience of end users, enhances the continuity, stability and reliability of battery pack performance, optimizes the handling mechanism under abnormal single-cell sampling conditions, and improves safety and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0017] Figure 1 Flowchart of an embodiment of the present invention.

[0018] Figure 2 Flowchart of sampling abnormality processing according to an embodiment of the present invention DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0020] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numbers and letter labels to refer to features in the drawings. Like or similar labels in the drawings and description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first", "second", "third", and "fourth", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0021] like Figure 1 As shown, according to an embodiment of the present invention, a method for handling abnormal single-cell sampling is provided. Single-cell sampling is to sample single-cell batteries through a sampling line, one end of the sampling line is connected to the single-cell battery, and the other end is connected to a sampling chip, including the following steps:

[0022] Step S101, sampling the voltage values ​​of the single cells in the battery pack.

[0023] Each single cell in the battery pack is connected to a sampling line, which can collect the voltage of the single cell and transmit the collected voltage information to other mechanisms. For example, in new energy vehicles, the voltage information of the single cell is collected through the sampling line by the BMS.

[0024] Step S102 , determining whether there are two adjacent single cells in the battery pack whose voltage values ​​meet abnormal characteristics.

[0025] The specific steps for determining whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics are as follows: obtaining the first voltage α of the single cell with the lowest voltage in the battery pack; obtaining the second voltage θ of the single cell in the battery pack that is positively adjacent to the single cell with the lowest voltage; obtaining the third voltage λ of the single cell with the highest voltage in the battery pack; determining whether the second voltage θ is equal to the third voltage λ; when the second voltage θ is equal to the third voltage λ, determining that there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics.

[0026] The single cells in the above-mentioned battery pack are arranged in the form of modules. Multiple modules are connected in series in sequence. Each module is composed of multiple single cells connected in series. Therefore, the single cells are arranged in a fixed order. Each single cell has a fixed position in the battery pack. Each single cell is usually numbered to determine the position and voltage of each single cell.

[0027] In the above-mentioned process of obtaining the first voltage α of the single cell with the lowest voltage in the battery pack, the number of the single cell with the lowest voltage is usually obtained at the same time, and the number of the single cell adjacent to the single cell in the positive direction is determined according to the number of the single cell with the lowest voltage.

[0028] The aforementioned positively adjacent specifically means that the single cell is connected in series to the positive electrode of the single cell with the lowest voltage.

[0029] Step S103 : when there are two adjacent single-cell voltage values ​​that meet the abnormal characteristics, the type of sampling abnormal state of the battery pack is determined according to the voltage values ​​of the two adjacent single-cells that meet the abnormal characteristics.

[0030] The above-mentioned types of judging whether the battery pack is in a sampling abnormal state based on the voltage values ​​of two adjacent single cells that meet the abnormal characteristics include: judging whether the first voltage α is less than or equal to a preset minimum voltage, judging whether the second voltage θ is greater than or equal to a preset maximum voltage; when the first voltage α is greater than the preset minimum voltage and / or the second voltage θ is less than the maximum preset voltage, then judging that the battery pack is in the first sampling abnormal state.

[0031] The above-mentioned preset minimum voltage and maximum preset voltage are set according to the model of the control chip of the sampling line. For example, when the MC33771 chip is selected, since the single cell voltage acquisition range of the MC33771 chip is 0-5V, the preset minimum voltage is generally set to 1V and the preset maximum voltage is generally set to 5V.

[0032] Step S104: based on the judgment result, sampling and abnormal processing are performed on the voltage values ​​of two adjacent single cells that meet the abnormal characteristics.

[0033] Specifically, Figure 2 As shown, the above-mentioned abnormal sampling processing of the voltage values ​​of two adjacent single cells that meet the abnormal characteristics according to the judgment result includes:

[0034] Step S1041, when it is determined that the battery pack is in a first sampling abnormal state, the sampling filter time is increased, and the voltages of two single cells that meet the abnormal characteristics are assigned values. The first sampling abnormal state is a sampling line virtual connection abnormal state.

[0035] The above-mentioned voltage assignment of the two single cells that meet the abnormal characteristics is specifically as follows: obtaining a first average voltage X of all the single cells in the battery pack except the two single cells that meet the abnormal characteristics; obtaining a second average voltage Y of all the single cells in the battery pack except the two single cells that meet the abnormal characteristics when the voltage values ​​of the single cells in the battery pack were collected last time; calculating the difference Δ between the voltage values ​​of the two single cells that meet the abnormal characteristics and the second average voltage Y when the voltage values ​​of the single cells in the battery pack were collected last time; and assigning the voltage values ​​of the two single cells that meet the abnormal characteristics according to the difference Δ and the first average voltage X.

[0036] For example, for a battery pack with 120 cells, after collecting abnormal values, remove the two adjacent voltage values ​​that meet the abnormal characteristics, and calculate the average voltage X of the remaining 118 cells and the average voltage Y at the moment before the abnormal value appears, and the deviation Δ (including upper and lower deviations) between the abnormal value and Y. At this moment, Δ is weighted on X to assign values ​​to the two abnormal voltage cells. The extreme values ​​(maximum voltage and minimum voltage) referenced by the pressure difference judgment plate, SOC (State of Charge) correction plate, and fault judgment plate of the BMS in the vehicle system are all calculated in the remaining 118 strings of cells.

[0037] When a sampling line virtual connection abnormality occurs, the sampling filter time of the sampling line is increased, and the sampling filter time and sampling robustness are usually increased. The sampling line virtual connection abnormality does not cause safety problems, but it is usually optimized to avoid affecting battery performance and end-user experience.

[0038] After assigning values ​​to the voltages of two adjacent single cells that meet the abnormal characteristics, the method further includes the following steps: setting a first detection delay time;

[0039] After the first detection delay time has passed, determining whether the battery pack is still in the first sampling abnormal state;

[0040] When the battery pack is still in the first sampling abnormal state, the first abnormal fault information is output, and the first abnormal fault information is used to indicate a sampling line virtual connection abnormal fault.

[0041] The above-mentioned first detection delay time is usually 5 driving cycles. The vehicle is started ON-OFF with one button, and one driving cycle is recorded. The first detection delay time can also be increased or decreased according to specific needs. Since the number of driving cycles can be used as a calibration quantity, the first detection delay time is usually an integer multiple of the driving cycle.

[0042] Step S1042: when it is determined that the battery pack is not in the first sampling abnormal state, it is determined whether the battery pack is in a thermal runaway state.

[0043] The above-mentioned determination of whether the battery pack is in a thermal runaway state is specifically as follows: setting a temperature threshold; obtaining the detection values ​​of all temperature sensors on the battery module where two single cells that meet the abnormal characteristics are located; determining whether the detection value of the temperature sensor is greater than the temperature threshold; when the detection value of the temperature sensor is greater than the temperature threshold, determining that the battery pack is in a thermal runaway state.

[0044] The above-mentioned temperature threshold is usually not less than 60°. When the temperature of a single cell is higher than 60°, it is usually considered that the single cell has thermal runaway. When a single cell has thermal runaway, there is a possibility that the explosion-proof valve will be ejected and the sampling line will be broken. Therefore, it is necessary to judge whether the single cell has thermal runaway.

[0045] Specifically, take each module with 20 single cells and 4 temperature sensors as an example, for example, the abnormality occurs at the 46th single cell. Then the single cell calculated by 46 / 20 is located in the third module. Then it is determined whether the values ​​of the 9th to 12th temperature sensors all exceed the temperature threshold.

[0046] Step S1043, when the battery pack is not in a thermal runaway state, determining whether the battery pack is in a second sampling abnormal state, the second sampling abnormal state being a sampling line disconnection abnormal state.

[0047] The above-mentioned determination of whether the battery pack is in the second sampling abnormal state is specifically as follows: setting the first filtering sampling time, which can be set according to demand, usually 8s; setting the sampling filtering time of the voltage value of the single cell in the battery pack to the first filtering sampling time, and setting the second detection delay time; after the second detection delay time, determining whether the first voltage α is less than the preset minimum voltage, and determining whether the second voltage θ is greater than the preset maximum voltage; when the first voltage α is less than the preset minimum voltage and the second voltage θ is greater than the preset maximum voltage, determining that the battery pack is in the second sampling abnormal state.

[0048] During vehicle operation, due to complex working conditions such as vibration, the sampling line may be disconnected. Therefore, in order to avoid disconnection judgment under such working conditions, the sampling filter time is increased to confirm the disconnection fault.

[0049] Step S1044: when the battery pack is in an abnormal state of a sampling line disconnection, the voltage values ​​of two adjacent single cells that meet the abnormal characteristics are removed, and when the vehicle is actually driving, the abnormal single cell voltage is assigned the effective value of the last moment. Other related functional modules do not refer to the abnormal value of this sampling.

[0050] After eliminating the collected voltage values ​​of two adjacent single cells that meet the abnormal characteristics, the following steps are included: confirming the voltage values ​​of the two single cells that meet the abnormal characteristics that were collected last time as valid values; using the valid values ​​as the voltage values ​​of the two single cells that meet the abnormal characteristics; setting a second detection delay time; judging whether the battery pack is still in the second sampling abnormal state after the second detection delay time; when the battery pack is still in the second sampling abnormal state, outputting second fault information, the second fault information is used to indicate a sampling line break abnormal fault.

[0051] The above-mentioned second detection delay time is two driving cycles, and the second detection delay time can be increased or decreased according to specific needs.

[0052] The present invention also discloses a single cell sampling abnormality processing system, comprising: a voltage sampling module, which samples the voltage value of a single cell in a battery pack; a voltage abnormality judgment module, which judges whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics; an abnormal state judgment module, which judges the type of sampling abnormal state of the battery pack according to the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics when there are two adjacent single cells whose voltage values ​​meet the abnormal characteristics; and an abnormality processing module, which performs sampling abnormality processing on the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics according to the judgment result.

[0053] The present invention also discloses an electronic device, which includes: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned processing method.

[0054] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the present invention ensures the driving experience of end users, enhances the continuity, stability and reliability of battery pack performance, optimizes the processing mechanism under abnormal conditions of single cell sampling, and improves safety and performance.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for handling single-unit sampling anomalies, characterized in that: The following steps are involved: Sampling the voltage value of the single cell in the battery pack; Determining whether there are two adjacent single cells in the battery pack whose voltage values ​​meet abnormal characteristics; When the voltage values ​​of two adjacent single cells meet the abnormal characteristics, the type of sampling abnormal state of the battery pack is determined according to the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics; According to the judgment result, the voltage values ​​of two adjacent single cells that meet the abnormal characteristics are sampled for abnormal processing.

2. A method for handling single-unit sampling anomalies according to claim 1, characterized in that: The sampling and abnormal processing of the voltage values ​​of two adjacent single cells that meet the abnormal characteristics according to the judgment result includes: When it is determined that the battery pack is in a first sampling abnormal state, the sampling filter time is increased, and the voltages of two single cells that meet the abnormal characteristics are assigned values, and the first sampling abnormal state is a sampling line virtual connection abnormal state; When it is determined that the battery pack is not in the first sampling abnormal state, determining whether the battery pack is in a thermal runaway state; When the battery pack is not in a thermal runaway state, determining whether the battery pack is in a second sampling abnormal state, where the second sampling abnormal state is a sampling line disconnection abnormal state; When the battery pack is in an abnormal state of a sampling line disconnection, the collected voltage values ​​of two adjacent single cells that meet the abnormal characteristics are discarded.

3. A method for handling single-unit sampling anomalies according to claim 2, characterized in that: The step of determining whether the voltage values ​​of two adjacent single cells in the battery pack meet the abnormal characteristics includes: Obtaining a first voltage α of a single cell with the lowest voltage in a battery pack; Obtaining a second voltage θ of a single cell positively adjacent to a single cell with the lowest voltage in the battery pack; Obtaining a third voltage λ of a single cell with the highest voltage in the battery pack; Determining whether the second voltage θ is equal to the third voltage λ; When the second voltage θ is equal to the third voltage λ, it is determined that the voltage values ​​of two adjacent single cells in the battery pack meet the abnormal characteristics.

4. A method for handling single-unit sampling anomalies according to claim 3, characterized in that: The type of judging that the battery pack is in a sampling abnormal state according to the voltage values ​​of two adjacent single cells that meet the abnormal characteristics includes: Determine whether the first voltage α is less than or equal to a preset minimum voltage, and determine whether the second voltage θ is greater than or equal to a preset maximum voltage; When the first voltage α is greater than a preset minimum voltage and / or the second voltage θ is less than a preset maximum voltage, it is determined that the battery pack is in the first sampling abnormal state.

5. A method for handling single-unit sampling anomalies according to claim 4, characterized in that: The voltage assignment of the two single cells meeting the abnormal characteristics includes: Obtaining a first average voltage X of all single cells in the battery pack except two single cells that meet the abnormal characteristics; Acquire a second average voltage Y of all the single cells in the battery pack except two single cells that meet the abnormal characteristics when the voltage values ​​of the single cells in the battery pack were collected last time; When calculating the voltage values ​​of the single cells in the battery pack in the last acquisition, the difference Δ between the voltage values ​​of the two single cells that meet the abnormal characteristics and the second average voltage Y; The voltage values ​​of the two single cells meeting the abnormal characteristics are assigned according to the difference Δ and the first average voltage X.

6. A method for handling single-unit sampling anomalies according to claim 2, characterized in that: After assigning the voltages of two adjacent single cells that meet the abnormal characteristics, the following steps are also included: Set the first detection delay time; After a first detection delay time has passed, determining whether the battery pack is still in the first sampling abnormal state; When the battery pack is still in the first sampling abnormal state, first abnormal fault information is output, where the first abnormal fault information is used to indicate a sampling line virtual connection abnormal fault.

7. A method for handling single-unit sampling anomalies according to claim 4, characterized in that: The determining whether the battery pack is in a thermal runaway state comprises: Set temperature thresholds; Obtain the detection values ​​of all temperature sensors on the battery module where the two single cells that meet the abnormal characteristics are located; Determine whether the detection value of the temperature sensor is greater than a temperature threshold; When the detection value of the temperature sensor is greater than a temperature threshold, it is determined that the battery pack is in a thermal runaway state.

8. A method for handling single-unit sampling anomalies according to claim 4, characterized in that: The determining whether the battery pack is in the second sampling abnormal state includes: Set the first filter sampling time; Setting the sampling filtering time of the voltage value of the single cell in the battery pack to the first filtering sampling time; Set the second detection delay time; After the second detection delay time has elapsed, determining whether the first voltage α is less than a preset minimum voltage, and determining whether the second voltage θ is greater than a preset maximum voltage; When the first voltage α is less than a preset minimum voltage and the second voltage θ is greater than a preset maximum voltage, it is determined that the battery pack is in a second sampling abnormal state.

9. A method for handling single-unit sampling anomalies according to claim 8, characterized in that: After removing the voltage values ​​of two adjacent single cells that meet the abnormal characteristics, The following steps are involved: Confirm the voltage values ​​of the two single cells that meet the abnormal characteristics collected last time as valid values; The effective value is taken as the voltage value of the two single cells that meet the abnormal characteristics; Set the second detection delay time; After the second detection delay time has passed, determining whether the battery pack is still in the second sampling abnormal state; When the battery pack is still in the second sampling abnormal state, second fault information is output, where the second fault information is used to indicate a sampling line disconnection abnormal fault.

10. A single sampling abnormality processing system, characterized in that: include: The voltage sampling module samples the voltage value of the single cell in the battery pack; A voltage anomaly judgment module is used to judge whether there are two adjacent single cells in the battery pack whose voltage values ​​meet the abnormal characteristics; an abnormal state judgment module, which, when the voltage values ​​of two adjacent single cells meet the abnormal characteristics, judges the type of sampling abnormal state of the battery pack according to the voltage values ​​of the two adjacent single cells that meet the abnormal characteristics; The abnormality processing module samples the voltage values ​​of two adjacent single cells that meet the abnormal characteristics and performs abnormal processing according to the judgment result.

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