Battery Abnormality Diagnosis Method, Device, Electronic Device and Storage Medium

Abstract

The present application provides a battery abnormality diagnosis method, apparatus, electronic device, and storage medium. The method includes: obtaining battery parameters of a battery, where the battery parameters include voltage information of each battery cell at a preset state of charge; performing voltage abnormality detection based on the voltage information of the battery cells to determine whether there are battery cells with voltage abnormalities and to determine the reasons for the abnormalities. In the embodiments of the present application, by analyzing the battery cells according to the voltage information of each battery cell at a preset state of charge, it is possible to efficiently determine whether there are battery cells with low voltage in the battery and the reasons for the low voltage.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more particularly, to a method, device, electronic device, and storage medium for diagnosing battery anomalies. Background Art

[0002] Batteries, which are a type of new energy, have been widely used. Currently, most batteries are composed of multiple battery cells connected in series, parallel, or in a hybrid configuration. However, the inconsistency of battery cells significantly reduces the performance of the battery.

[0003] To ensure that the battery provides good performance for the electrical device and to increase the usage time of the electrical device, the battery can be regularly safety tested to identify low-voltage battery cells that affect the battery performance. In the prior art, after determining the low-voltage battery cell, it is necessary to manually check the cause of the low voltage of the battery cell and then perform repairs based on this cause, resulting in a low troubleshooting efficiency. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a method, device, electronic device, and storage medium for diagnosing battery anomalies, so as to solve the problem of low efficiency in troubleshooting the cause of the low voltage of battery cells in the prior art.

[0005] In a first aspect, the embodiments of this application provide a method for diagnosing battery anomalies, including:

[0006] Obtain the battery parameters of the battery, where the battery parameters include the voltage information of each battery cell at a preset state of charge.

[0007] Based on the voltage information of the battery cells, determine whether there are battery cells with abnormal voltages and determine the reasons for the abnormalities of the battery cells with abnormal voltages.

[0008] The embodiments of this application analyze the battery cells based on the voltage information of each battery cell at the preset state of charge, so as to efficiently determine whether there are low-voltage battery cells in the battery and the reasons for the low voltage.

[0009] In any embodiment, the voltage information of each battery cell at the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold.

[0010] Based on the battery parameters, for each battery cell in the battery, determine whether there are battery cells with abnormal voltages and determine the reasons for the abnormalities of the battery cells with abnormal voltages, including:

[0011] If the lowest first voltage is less than the preset voltage, determine that the battery cell with the lowest voltage is a battery cell with an abnormal voltage, and the reason for the abnormality is the first self-discharge anomaly.

[0012] In the embodiments of the present application, under normal circumstances, during the discharge process of a battery cell, it will cut off when its voltage drops to a preset voltage. If the battery cell has a first self-discharge abnormality, the voltage will continue to drop when it drops to the preset voltage. Therefore, it is possible to accurately and quickly determine whether the battery cell has a first self-discharge abnormality based on whether the first voltage is less than the preset voltage.

[0013] In any embodiment, the battery parameters further include the position information of the battery cells. The voltage information of each battery cell under the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold, and the second voltage of each battery cell when the state of charge of the battery is higher than the second threshold; wherein, the second threshold is greater than the first threshold;

[0014] Performing voltage abnormality detection on each battery cell in the battery according to the battery parameters to determine whether there is a battery cell with a voltage abnormality and to determine the cause of the abnormality, including:

[0015] Judging whether the battery contains a battery cell with a voltage abnormality and determining the cause of the abnormality according to the first voltage, the second voltage and the position information.

[0016] In the embodiments of the present application, based on the voltage conditions of the battery cells under different states of charge and the position information, it is possible to quickly and accurately determine whether there is a battery cell with a low voltage in the battery and the cause of the low voltage, so that the staff can perform repairs according to the cause.

[0017] In any embodiment, the battery parameters further include the position information of the battery cells. The voltage information of each battery cell under the preset state of charge further includes the second voltage of each battery cell when the state of charge of the battery is higher than the second threshold; wherein, the second threshold is greater than the first threshold;

[0018] If the lowest first voltage is not less than the preset voltage, judging whether the battery contains a battery cell with a voltage abnormality and determining the cause of the abnormality according to the first voltage, the second voltage and the position information.

[0019] In the embodiments of the present application, based on the voltage conditions of the battery cells under different states of charge and the position information, it is possible to quickly and accurately determine whether there is a battery cell with a low voltage in the battery and the cause of the low voltage, so that the staff can perform repairs according to the cause.

[0020] In any embodiment, judging whether the battery contains a battery cell with a voltage abnormality and determining the cause of the abnormality according to the first voltage, the second voltage and the position information, including:

[0021] If the position information of the first target battery cell corresponding to the maximum value of the second voltage is the same as the position information of the second target battery cell corresponding to the minimum value of the first voltage, determine that the first target battery cell is a battery cell with abnormal voltage, and the cause of the abnormality is abnormal capacity attenuation.

[0022] In the embodiments of the present application, if the battery cell with the maximum voltage under the high state of charge of the battery has the minimum voltage under the low state of charge of the battery, it indicates that the battery cell has abnormal capacity attenuation. Therefore, it can be judged whether the first target battery cell corresponding to the maximum value of the second voltage and the second target battery cell corresponding to the minimum value of the first voltage are the same battery cell, and it can be quickly and efficiently determined whether the battery cell has abnormal capacity attenuation.

[0023] In any embodiment, judging whether the battery contains battery cells with abnormal voltage according to the first voltage, the second voltage and the position information, and determining the cause of the abnormality, includes:

[0024] If the position information of the third target battery cell corresponding to the minimum value of the second voltage is the same as the position information of the second target battery cell corresponding to the minimum value of the first voltage, determine that the third target battery cell is a battery cell with abnormal voltage, and the cause of the abnormality is secondary self-discharge abnormality.

[0025] The embodiments of the present application can quickly and accurately determine whether the battery cell has secondary self-discharge abnormality by judging whether the battery cell with the lowest voltage under the high state of charge of the battery and the battery cell with the lowest voltage under the low state of charge of the battery are the same battery cell.

[0026] In any embodiment, judging whether the battery contains battery cells with abnormal voltage according to the first voltage, the second voltage and the position information, and determining the cause of the abnormality, includes:

[0027] If the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the first target battery cell corresponding to the maximum value of the second voltage, and the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the third target battery cell corresponding to the minimum value of the second voltage, determine that the battery has no abnormality.

[0028] The embodiments of the present application can quickly and accurately judge whether there are battery cells with low voltage in the battery and the cause of the low voltage according to the voltage conditions and position information of the battery cells under different states of charge, so that the staff can perform repairs according to the cause.

[0029] In any embodiment, the method further includes:

[0030] If the cause of the abnormality is abnormal capacity attenuation, trigger an alarm.

[0031] In the embodiments of the present application, by determining the abnormal cause of the battery cell, a corresponding processing method can be given in a timely manner.

[0032] In any embodiment, the method further includes:

[0033] If the abnormal cause is the second self-discharge abnormality, voltage equalization processing is performed on the battery; if there are still low-voltage battery cells in the battery after the voltage equalization processing, a low-voltage alarm is issued.

[0034] In the embodiments of the present application, based on the conclusion obtained according to the judgment logic, the vehicle effectively performs voltage equalization or clear fault alarm, reducing the impact of equalization on the battery life. The clear failure mode is beneficial to improving the failure analysis efficiency of analysts.

[0035] In a second aspect, an embodiment of the present application provides a battery abnormality diagnosis device, including:

[0036] A parameter acquisition module, configured to acquire battery parameters of the battery, where the battery parameters include voltage information of each battery cell at a preset state of charge;

[0037] A diagnosis module, configured to determine whether there is a battery cell with voltage abnormality according to the voltage information of the battery cell, and determine the abnormal cause of the battery cell with voltage abnormality.

[0038] In a third aspect, an embodiment of the present application provides an electronic device, including: a processor, a memory, and a bus, where:

[0039] The processor and the memory complete communication with each other through the bus;

[0040] The memory stores program instructions executable by the processor, and the processor can execute the method of the first aspect by calling the program instructions.

[0041] In a fourth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium, including:

[0042] The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the method of the first aspect.

[0043] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification, or be understood by implementing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the written specification, claims, and drawings. Description of the Drawings

[0044] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0045] Figure 1 Schematic diagram of the process of a battery anomaly diagnosis method provided by an embodiment of the present application;

[0046] Figure 2 Schematic diagram of the process of another battery anomaly diagnosis method provided by an embodiment of the present application;

[0047] Figure 3 Schematic diagram of the structure of a battery anomaly diagnosis device provided by an embodiment of the present application;

[0048] Figure 4 Schematic diagram of the physical structure of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0049] The following will describe the embodiments of the technical solutions of the present application in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawing descriptions are intended to cover non-exclusive inclusion.

[0051] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "plural" means more than two unless otherwise specifically defined.

[0052] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the preceding and following associated objects.

[0054] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0055] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0057] In the context of the energy transformation era, the application of power batteries is becoming more and more widespread. Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0058] The power battery includes multiple battery cells connected in series, parallel, or in a hybrid connection. The performance of the power battery is affected by the performance of each battery cell. When a low voltage appears in a battery cell, the usage duration of the electrical device equipped with this power battery after one charge will be greatly reduced. Taking an electric vehicle as an example, when there is a battery cell with a short circuit or abnormal capacity attenuation in the power battery pack, it will be manifested as a reduction in the vehicle's cruising range and low voltage at the vehicle end. Currently, the power battery management system regularly collects the voltage information of all battery cells in the power battery, and determines whether there is a battery cell with a low voltage in the power battery by capturing the difference between the lowest voltage and the highest voltage, so as to judge whether the battery cell is abnormal. However, the inventor has found that this method can only judge whether there is a battery cell with abnormal voltage in the power battery, and cannot determine the reason for the low voltage of the battery cell, that is, it cannot determine whether the battery cell has a low voltage due to self-discharge or due to abnormal capacity attenuation. Therefore, the battery management system cannot trigger targeted fault handling operations, and it needs to be manually analyzed by staff, resulting in a low efficiency of battery anomaly diagnosis.

[0059] To solve the above technical problems, the inventor of this application has discovered through long-term research that it is possible to analyze the voltage information of each battery cell at a specific state of charge (SOC) of the battery to determine whether there is a battery cell with a low voltage in the battery and the reason for the low voltage anomaly.

[0060] The battery anomaly diagnosis method provided in the embodiments of this application is applicable to rechargeable batteries, which can be lithium-ion batteries or batteries made of other chemical materials. The embodiments of this application do not make specific limitations in this regard. In addition, the batteries provided in the embodiments of this application can be used but are not limited to electrical devices such as vehicles, ships, or aircraft. The embodiments of this application provide an electrical device that uses a battery as a power source. The electrical device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0061] Figure 1 It is a schematic flowchart of a battery anomaly diagnosis method provided in the embodiments of this application. As Figure 1 shown, the main body executing this method can be a battery management system or other devices used to detect batteries. For the convenience of description, the embodiments of this application take the battery management system as the execution main body. This method includes:

[0062] Step 101: Obtain the battery parameters of the battery. The battery parameters include the voltage information of each battery cell under a preset state of charge.

[0063] Step 102: Determine whether there is a battery cell with abnormal voltage according to the obtained voltage information of the battery cells, and determine the cause of the abnormality of the battery cell with abnormal voltage.

[0064] In Step 101, the battery includes a plurality of battery cells connected in series, parallel or in a hybrid connection. The battery management system is connected to each battery cell and can be used to obtain the battery parameters. Among them, the battery parameters may include the voltage information of each battery cell under a preset state of charge. It can be understood that the state of charge of the battery refers to the ratio of the remaining capacity in the battery to the capacity in the fully charged state. The preset state of charge is a state of charge that is pre-determined and meaningful for analyzing the cause of low voltage of the battery cell. The preset state of charge may have only one value or multiple values. When the preset state of charge is multiple values, it means that the battery parameters include the voltage information of the battery cells under multiple states of charge. It should be noted that the preset state of charge is determined by the inventors of this application through multiple tests. In addition, the battery parameters may also include other parameters, such as the charge and discharge state of the battery, etc. The embodiments of this application do not make specific limitations on this.

[0065] In Step 102, after the battery management system obtains the voltage information of the battery cells, it can use this voltage information for voltage abnormality detection. The purpose of the detection is to judge whether there is a battery cell with low voltage among the multiple battery cells included in the battery, and the reason for the low voltage of the battery cell.

[0066] It should be noted that the voltage of each battery cell in the battery system is monitored. Low voltage abnormality means that in the battery system, the voltage level of a certain battery cell is lower than that of other battery cells, resulting in the entire system being unable to effectively utilize all its capacity.

[0067] The embodiments of this application analyze the battery cells according to the voltage information of each battery cell under the preset charge state, so as to efficiently obtain whether there is a battery cell with low voltage in the battery and the reason for the low voltage.

[0068] Based on the above embodiments, the voltage information of each battery cell under the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold;

[0069] Determine whether there is a battery cell with abnormal voltage and determine the cause of the abnormality according to the following method, including:

[0070] If the first voltage, which is the lowest voltage, is less than the preset voltage, it is determined that the battery cell with the lowest voltage is the battery cell with abnormal voltage, and the reason for the abnormality is the first self-discharge abnormality.

[0071] In a specific implementation process, the first threshold is a preset value. For example, it can be 30% or 20% etc. The embodiments of the present application do not specifically limit the specific value of the first threshold. For the convenience of understanding, the embodiments of the present application take the first threshold as 20% as an example for description. The preset voltage is the cut-off voltage preset in the battery management system. That is, under normal circumstances, when the battery cell discharges, when the voltage drops to this preset voltage, it will no longer continue to discharge. Among them, the value of the preset voltage can be 2.5V or 2.6V etc. Therefore, for a normal battery cell, regardless of the charging state or the discharging state, the battery will not have a voltage lower than the preset voltage.

[0072] Therefore, the battery management system can collect the first voltage corresponding to each battery cell when the state of charge (SOC) of the battery is less than 20% during the discharging process of the battery. It can be understood that the first voltages corresponding to each battery cell are not exactly the same. After the battery management system collects the first voltages, it selects the smallest first voltage from them and determines whether the smallest first voltage is less than the preset voltage. If so, it is determined that the battery contains a battery cell with a low voltage due to a self-discharge fault. In the embodiments of the present application, this is called the first self-discharge abnormality. This abnormality cannot be solved by voltage equalization. Therefore, if this type of abnormality occurs, an alarm can be directly given.

[0073] In the embodiments of the present application, under normal circumstances, when the voltage of the battery cell drops to the preset voltage during the discharging process, it will cut off. If the battery cell has the first self-discharge abnormality, the voltage will continue to drop when it drops to the preset voltage. Therefore, according to whether the first voltage is less than the preset voltage, it can be accurately and quickly determined whether the battery cell has the first self-discharge abnormality.

[0074] Based on the above embodiments, the battery parameters further include the position information of the battery cells, and the voltage information of each battery cell under the preset state of charge further includes the second voltage of each battery cell with a state of charge higher than the second threshold; where the second threshold is greater than the first threshold;

[0075] If the first voltage, which is the lowest voltage, is not less than the preset voltage, it is determined whether the battery contains a battery cell with abnormal voltage according to the first voltage, the second voltage and the position information, and the reason for the abnormality is determined.

[0076] In a specific implementation process, the position information of the battery cells can be represented by the numbers of the battery cells, that is, a unique number is set for each battery cell in the battery in advance. It can be understood that the numbers can be Arabic numerals, English letters, or in binary format. The embodiments of the present application do not make specific limitations in this regard. The purpose of obtaining the position information is, on the one hand, to determine whether a battery cell is abnormal, and on the other hand, when a battery cell is abnormal, it can assist the staff to quickly locate the abnormal battery cell.

[0077] The battery management system also collects the second voltages of the battery cells with the state of charge (SOC) higher than the second threshold when the battery is in the charging state. The second threshold is also set in advance. For example, it can be 70%, 75%, 80%, etc. The embodiments of the present application do not make specific limitations in this regard. However, the specific value of the second threshold is greater than the specific value of the first threshold. In addition, the SOC can be the SOC in the charging state or the SOC in the discharging state.

[0078] After the battery management system obtains the position information, the first voltage, and the second voltage of each battery cell, it first determines whether the minimum value in the first voltage is less than the preset voltage. If it is less than the preset voltage, it can be determined that the battery cell corresponding to the minimum value of the first voltage has a self-discharge fault; if it is not less than the preset voltage, it continues to analyze based on the position information, the first voltage, and the second voltage to determine whether there is a battery cell with abnormal voltage in the battery. If there is, it determines the reason for the abnormality of the battery cell.

[0079] It can be understood that the preset voltage is the same as the preset voltage in the above embodiments, which refers to the cut-off voltage preset in the battery management system. Voltage abnormality in the embodiments of the present application refers to low-voltage abnormality of the battery cell.

[0080] The embodiments of the present application can quickly and accurately determine whether there are battery cells with low voltage in the battery and the reasons for the low voltage based on the voltage conditions and position information of the battery cells under different states of charge, so that the staff can perform repairs according to the reasons.

[0081] Based on the above embodiments, the battery parameters further include the position information of the battery cells. The voltage information of each battery cell under the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold, and the second voltage of each battery cell when the state of charge of the battery is higher than the second threshold; where the second threshold is greater than the first threshold;

[0082] Performing voltage abnormality detection on each battery cell in the battery according to the battery parameters to determine whether there are battery cells with voltage abnormality and to determine the reasons for the abnormality, including:

[0083] Judge whether the battery contains a battery cell with abnormal voltage according to the first voltage, the second voltage and the position information, and determine the cause of the abnormality.

[0084] In a specific implementation process, the position information of the battery cell can be represented by the number of the battery cell, that is, a unique number is set for each battery cell in the battery in advance. It can be understood that the number can be represented by Arabic numerals, English letters, or in binary form, and the embodiments of the present application do not make specific limitations on this. The purpose of obtaining the position information is on the one hand to judge whether the battery cell is abnormal, and on the other hand, when the battery cell is abnormal, it can assist the staff to quickly locate the abnormal battery cell.

[0085] The battery management system also collects the second voltage of each battery cell with a state of charge (SOC) higher than the second threshold when the battery is in a charging state. Among them, the second threshold is also set in advance, for example, it can be 70%, 75% or 80%, etc., and the embodiments of the present application do not make specific limitations on this. However, the specific value of the second threshold is greater than the specific value of the first threshold.

[0086] After the battery management system obtains the position information, the first voltage and the second voltage of each battery cell, it can analyze based on the obtained data to judge whether the battery does not contain a battery cell with abnormal voltage. If it does, it determines the cause of the abnormality of the battery cell.

[0087] It can be understood that the abnormal voltage in the embodiments of the present application refers to the low-voltage abnormality of the battery cell.

[0088] The embodiments of the present application can quickly and accurately judge whether there is a battery cell with low voltage in the battery and the cause of the low voltage according to the voltage conditions and position information of the battery cells in different states of charge, so that the staff can perform repairs according to the cause.

[0089] Based on the above embodiments, judging whether the battery contains a battery cell with abnormal voltage according to the first voltage, the second voltage and the position information, and determining the cause of the abnormality, includes:

[0090] If the position information of the first target battery cell corresponding to the maximum value of the second voltage is the same as the position information of the second target battery cell corresponding to the minimum value of the first voltage, it is determined that the first target battery cell is a battery cell with abnormal voltage, and the cause of the abnormality is capacity attenuation abnormality.

[0091] In a specific implementation process, the battery voltage increases with the increase of the state of charge. When the battery capacity is abnormal, the required charging time is shorter, the voltage increases faster, and the battery cell quickly reaches the upper limit voltage during charging. Similarly, it quickly reaches the lower limit voltage during discharging. Therefore, the battery management system obtains the position information of the first target battery cell corresponding to the second voltage maximum value, and obtains the position information of the second target battery cell corresponding to the first voltage minimum value. It judges whether the above two position information is the same. If the position information is represented by numbers, it judges whether the two position information is equal. If they are the same, it means that this battery cell has the highest voltage at high SOC and the lowest voltage at low SOC. At this time, it can be determined that this battery cell has abnormal capacity attenuation.

[0092] It should be noted that both the first target battery cell and the second target battery cell are one of the multiple battery cells included in the battery.

[0093] In the embodiment of the present application, if the battery cell with the maximum voltage under high state of charge of the battery has the minimum voltage under low state of charge of the battery, it means that this battery cell has abnormal capacity attenuation. Therefore, it can be judged whether the first target battery cell corresponding to the second voltage maximum value is the same battery cell as the second target battery cell corresponding to the first voltage minimum value, and it can quickly and efficiently determine whether this battery cell has abnormal capacity attenuation.

[0094] Based on the above embodiment, it is judged whether the battery contains battery cells with abnormal voltage according to the first voltage, the second voltage and the position information, and the abnormal reason is determined, including:

[0095] If the position information of the third target battery cell corresponding to the second voltage minimum value is the same as the position information of the second target battery cell corresponding to the first voltage minimum value, it is determined that the third target battery cell is the battery cell with abnormal voltage, and the abnormal reason is the second self-discharge abnormality.

[0096] In a specific implementation process, the battery management system obtains the third target battery cell corresponding to the second voltage minimum value when the battery is at high SOC. And obtains the second target battery cell corresponding to the first voltage minimum value when the battery is at low SOC. It judges whether the third target battery cell and the second target battery cell are the same battery cell according to the position information of the third target battery cell and the position information of the second target battery cell. The specific judgment method is: judge whether the above two position information is the same. If they are the same, it means that the third target battery cell and the second target battery cell are the same battery cell, otherwise, the third target battery cell and the second target battery cell are not the same battery cell.

[0097] When the third target battery cell and the second target battery cell are the same battery cell, it indicates that at high state of charge (SOC) of the battery, the voltage of this battery cell is the lowest, and at low SOC, the voltage of this battery cell is also the lowest, which shows that this battery cell always exhibits a low voltage. At this time, it can be determined that the second self-discharge anomaly has occurred in this battery cell.

[0098] It should be noted that both the second target battery cell and the third target battery cell are one of the multiple battery cells included in the battery.

[0099] In the embodiment of the present application, by determining whether the battery cell with the lowest voltage at high state of charge of the battery and the battery cell with the lowest voltage at low state of charge of the battery are the same battery cell, it can be quickly and accurately determined whether the second self-discharge anomaly has occurred in this battery cell.

[0100] Based on the above embodiment, judging whether the battery contains battery cells with voltage anomalies according to the first voltage, the second voltage and the position information, and determining the cause of the anomaly, including:

[0101] If the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the first target battery cell corresponding to the maximum value of the second voltage, and the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the third target battery cell corresponding to the minimum value of the second voltage, it is determined that the battery has no anomaly.

[0102] In the specific implementation process, the battery management system selects the second target battery cell corresponding to the minimum value of the first voltage from the first voltages corresponding to each battery cell obtained, and selects the first target battery cell corresponding to the maximum value of the second voltage and the third target battery cell corresponding to the minimum value of the second voltage from the second voltages corresponding to each battery cell obtained. According to the position information of the battery cell, it is judged whether the second target battery cell and the first target battery cell are the same battery cell. Specifically, it can be judged by whether the position information corresponding to the second target battery cell is the same as the position information corresponding to the first target battery cell. If they are the same, it means that the second target battery cell and the first target battery cell are the same battery cell.

[0103] Similarly, according to the position information, it is judged whether the second target battery cell and the third target battery cell are the same battery cell.

[0104] If the second target battery cell and the first target battery cell are not the same battery cell, and the second target battery cell and the third target battery cell are not the same battery cell either, it means that the battery has not malfunctioned.

[0105] In the embodiments of the present application, based on the voltage conditions and position information of battery cells under different states of charge, it is possible to quickly and accurately determine whether there are battery cells with low voltage in the battery and the reasons for the low voltage, so that the staff can perform repairs according to the reasons.

[0106] After determining the abnormal reason, the method further includes: if the abnormal reason is abnormal capacity attenuation, triggering an alarm.

[0107] In a specific implementation process, for the low voltage abnormality caused by abnormal capacity attenuation, manual handling is required, and an alarm can be triggered at this time.

[0108] It should be noted that when triggering an alarm, it can be through voice alarm, or the alarm information can be displayed on the in-vehicle display, or the alarm information can be sent to a mobile terminal communicatively connected to the whole vehicle, etc. Specifically, it can be selected according to actual needs, and the embodiments of the present application do not make specific limitations on this. In addition, the triggered alarm can include the abnormal reason.

[0109] In the embodiments of the present application, by determining the abnormal reason of the battery cell, corresponding processing methods can be given in a timely manner.

[0110] After determining the abnormal reason, the method further includes: if the abnormal reason is abnormal second self-discharge, performing voltage equalization processing on the battery; if there are still battery cells with low voltage in the battery after the voltage equalization processing, issuing a low voltage alarm.

[0111] After the battery management system determines the reason for the low voltage abnormality of the battery cells in the battery, corresponding processing is performed according to the specific reason. For the low voltage caused by abnormal second self-discharge and the lowest voltage not being lower than the preset voltage, the battery management system can perform voltage equalization processing on the battery to eliminate the voltage difference between the battery cells in the battery. If the voltage difference still cannot be compensated after the voltage equalization processing, alarm processing is performed.

[0112] In the embodiments of the present application, based on the conclusion obtained from the judgment logic, the whole vehicle effectively performs voltage equalization or clear fault alarm, reducing the impact of equalization on the battery life, and the clear failure mode is beneficial to improving the failure analysis efficiency of analysts.

[0113] Figure 2 Another schematic flow diagram of a battery abnormality diagnosis method provided by the embodiments of the present application is as Figure 2 shown, and the method includes:

[0114] Step 201: Collect the basic information of the battery; the battery management system collects all the basic information data of the battery cells; the basic information includes voltage data, the position information of the battery cells, charge and discharge state data, and state of charge data. Among them, the charge and discharge state data includes the charge state and the discharge state.

[0115] Step 202: Clean invalid data; after obtaining the basic information of the battery, clean the abnormal data outside the battery operating range, that is, the data streams corresponding to voltage values less than or equal to 0V and voltage values greater than 5V, to obtain standard battery data.

[0116] Step 203: Extract single charge and discharge data; select single charge and discharge data from the standard battery voltage data. This charge and discharge data needs to ensure that the charging SOC > 80% and the discharging SOC < 20%. Extract the second minimum voltage (U2min) in the high SOC state during charging and the position information (C2min) of this battery cell, the second maximum voltage (U2max) and the position information (C2max) of this battery cell, and the first minimum voltage (U1min) in the low SOC state during discharging and the position information (C1min) of the corresponding battery cell. It can be understood that both SOC > 80% and SOC < 20% are examples.

[0117] Step 204: Determine whether the first minimum voltage is less than the preset voltage; under normal conditions, the vehicle battery management system has a lower cut-off voltage for the discharging process. However, when there is a problem of battery self-discharge, after the vehicle discharges to the cut-off voltage U LSL and the battery continues to self-discharge, exceeding the control range of the management system, being lower than the cut-off voltage, and such low voltage cannot be compensated by balancing. Therefore, when U1min < U LSL , it is determined as the first self-discharge abnormality, that is, execute Step 207. Otherwise, execute Step 205.

[0118] Step 205: Determine whether the battery cell corresponding to the first minimum voltage is the same as the battery cell corresponding to the second maximum voltage; the battery voltage will increase as the state of charge increases, and the vehicle charging current is consistent. When the battery capacity is abnormal, the required charging time is shorter, the voltage increases faster, and the battery cell quickly reaches the upper limit voltage during charging. Similarly, it quickly reaches the lower limit voltage during discharging. Therefore, when C1min = C2max, it is a problem of capacity attenuation abnormality, that is, execute Step 211.

[0119] Step 206: Determine whether the battery cell corresponding to the first minimum voltage is the same as the battery cell corresponding to the second minimum voltage; if there is a second self-discharge abnormality in the battery, the battery always shows a low voltage regardless of the high SOC or low SOC state. When C1min = C2min, it is the second self-discharge abnormality, that is, execute Step 208. It should be noted that the execution order of Step 205 and Step 206 can also be executed simultaneously, or Step 206 can be executed first and then Step 205.

[0120] Step 207: Determine that it is the first self-discharge anomaly; the first self-discharge anomaly cannot be compensated by balancing, and the battery management system issues a low voltage alarm, that is, execute Step 210.

[0121] Step 208: Determine that it is the second self-discharge anomaly; for a failure where the voltage does not exceed the cut-off lower limit voltage U LSL voltage balancing can be performed first for such a failure, that is, execute Step 209.

[0122] Step 209: Voltage balancing; if the voltage difference cannot be compensated by balancing, the battery management system issues a low voltage alarm again, that is, execute Step 210.

[0123] Step 210: Low voltage alarm;

[0124] Step 211: Determine that it is a capacity attenuation anomaly;

[0125] Step 212: Capacity anomaly alarm;

[0126] Step 213: The battery is normal; if both Step 207 and Step 208 are not established, it is determined that there are only minor differences in the voltage levels of all single cells in the whole vehicle, and there is no faulty battery.

[0127] According to the vehicle background data in the embodiments of the present application, the reason for insufficient vehicle endurance is locked as a capacity anomaly or a self-discharge anomaly, and then effective fault handling operations are carried out, reducing the discharge balancing of other batteries by the whole vehicle during capacity anomalies and slowing down the impact of balancing on the life of other batteries.

[0128] Figure 3 It is a schematic structural diagram of a battery anomaly diagnosis device provided by an embodiment of the present application. As Figure 3 shown, the device includes a parameter acquisition module 301 and a diagnosis module 302; where:

[0129] The parameter acquisition module 301 is used to acquire battery parameters of the battery; where the battery parameters include voltage information of each battery cell at a preset state of charge; the diagnosis module 302 is used to determine whether there is a battery cell with a voltage anomaly according to the voltage information of the battery cell, and determine the anomaly reason of the battery cell with a voltage anomaly.

[0130] Based on the above embodiments, the voltage information of each battery cell at the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold during discharge;

[0131] The diagnosis module 302 is specifically used for:

[0132] If the lowest first voltage is less than the preset voltage, determine that the battery cell with the lowest voltage is the battery cell with a voltage anomaly, and the anomaly reason is the first self-discharge anomaly.

[0133] Based on the above embodiments, the battery parameters further include the position information of each battery cell. The voltage information of each battery cell under the preset state of charge includes the first voltage corresponding to each battery cell when the state of charge of the battery is lower than the first threshold, and the second voltage of each battery cell when the state of charge of the battery is higher than the second threshold; where the second threshold is greater than the first threshold.

[0134] The diagnostic module 302 is specifically configured to:

[0135] Judge whether the battery contains battery cells with abnormal voltages based on the first voltage, the second voltage, and the position information, and determine the cause of the abnormality.

[0136] Based on the above embodiments, the battery parameters further include the position information of each battery cell. The voltage information of each battery cell under the preset state of charge further includes the second voltage of each battery cell when the state of charge of the battery is higher than the second threshold during charging; where the second threshold is greater than the first threshold.

[0137] The diagnostic module 302 is specifically configured to:

[0138] If the first voltage with the lowest voltage is not less than the preset voltage, judge whether the battery contains battery cells with abnormal voltages based on the first voltage, the second voltage, and the position information, and determine the cause of the abnormality.

[0139] Based on the above embodiments, the diagnostic module 302 is specifically configured to:

[0140] If the position information of the first target battery cell corresponding to the maximum value of the second voltage is the same as the position information of the second target battery cell corresponding to the minimum value of the first voltage, determine that the first target battery cell is a battery cell with abnormal voltage, and the cause of the abnormality is abnormal capacity attenuation.

[0141] Based on the above embodiments, the diagnostic module 302 is specifically configured to:

[0142] If the position information of the third target battery cell corresponding to the minimum value of the second voltage is the same as the position information of the second target battery cell corresponding to the minimum value of the first voltage, determine that the third target battery cell is a battery cell with abnormal voltage, and the cause of the abnormality is abnormal second self-discharge.

[0143] Based on the above embodiments, the diagnostic module 302 is specifically configured to:

[0144] If the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the first target battery cell corresponding to the maximum value of the second voltage, and the position information of the second target battery cell corresponding to the minimum value of the first voltage is different from the position information of the third target battery cell corresponding to the minimum value of the second voltage, determine that the battery is normal.

[0145] Based on the above embodiments, the device further includes an alarm module, which is used for:

[0146] If the abnormal reason is abnormal capacity attenuation, an alarm is triggered.

[0147] Based on the above embodiments, the device further includes a balancing module, which is used for:

[0148] If the abnormal reason is the second self-discharge abnormality, voltage balancing processing is performed on the battery;

[0149] If the battery still contains low-voltage battery cells after the voltage balancing processing, a low-voltage alarm is issued.

[0150] Figure 4 It is a schematic diagram of the physical structure of the electronic device provided by the embodiment of the present application. As Figure 4 shown, the electronic device includes: a processor 401, a memory 402, and a bus 403; wherein,

[0151] The processor 401 and the memory 402 complete mutual communication through the bus 403;

[0152] The processor 401 is used to call program instructions in the memory 402 to execute the methods provided by the above method embodiments, for example, including: obtaining battery parameters of the battery, where the battery parameters include voltage information of each battery cell under a preset state of charge; performing voltage abnormality detection based on the voltage information of the battery cells, determining whether there are battery cells with voltage abnormalities, and determining the abnormal reasons for the battery cells with voltage abnormalities.

[0153] The processor 401 can be an integrated circuit chip with signal processing capabilities. The above processor 401 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0154] The memory 402 may include, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc.

[0155] This embodiment discloses a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided in the above method embodiments. For example, it includes: obtaining battery parameters of a battery, where the battery parameters include voltage information of each battery cell under a preset state of charge; performing voltage anomaly detection based on the voltage information of the battery cells, determining whether there are battery cells with voltage anomalies, and determining the reasons for the anomalies of the battery cells with voltage anomalies.

[0156] This embodiment provides a non-transitory computer-readable storage medium. The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the methods provided in the above method embodiments. For example, it includes: obtaining battery parameters of a battery, where the battery parameters include voltage information of each battery cell under a preset state of charge; performing voltage anomaly detection based on the voltage information of the battery cells, determining whether there are battery cells with voltage anomalies, and determining the reasons for the anomalies of the battery cells with voltage anomalies.

[0157] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection to each other can be through some communication interfaces. The indirect coupling or communication connection of devices or units can be in an electrical, mechanical or other form.

[0158] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0159] Furthermore, in each embodiment of this application, the various functional modules may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

[0160] In this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0161] The above description is only for the embodiments of this application and is not used to limit the protection scope of this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A battery abnormality diagnosis method, characterized in that: include: Obtaining battery parameters of the battery; wherein the battery parameters include voltage information of each battery cell of the battery at a preset state of charge; determining, based on the voltage information of the battery cells, whether there is a battery cell with abnormal voltage, and determining the abnormal cause of the battery cell with abnormal voltage, wherein the abnormal cause is abnormal self-discharge; The battery parameters also include location information of the battery cells; the voltage information of each battery cell at the preset state of charge includes a first voltage corresponding to each battery cell when the state of charge of the battery is lower than a first threshold, and a second voltage corresponding to each battery cell when the state of charge of the battery is higher than a second threshold; wherein the second threshold is greater than the first threshold; Determining whether there is a battery cell with abnormal voltage for each battery cell in the battery according to the battery parameters, and determining the abnormal cause of the battery cell with abnormal voltage, including: It is determined whether the battery includes a battery cell with abnormal voltage according to the first voltage, the second voltage, and the position information, and a cause of the abnormality is determined.

2. The method according to claim 1, characterized in that in, The voltage information of each battery cell under the preset state of charge includes a first voltage corresponding to each battery cell when the state of charge of the battery is lower than a first threshold; The determining, based on the battery parameters, whether there is a battery cell with abnormal voltage and determining the abnormal cause of the battery cell with abnormal voltage includes: If the first voltage with the lowest voltage is lower than the preset voltage, it is determined that the battery cell with the lowest voltage is a battery cell with abnormal voltage, and the abnormality is caused by the first self-discharge abnormality.

3. The method according to claim 2, characterized in that in, The battery parameters further include location information of the battery cells; the voltage information of each battery cell at the preset state of charge also includes a second voltage of each battery cell when the state of charge of the battery is higher than a second threshold; wherein the second threshold is greater than the first threshold; The method further comprises: If the lowest first voltage is not less than the preset voltage, it is determined whether the battery includes a battery cell with abnormal voltage according to the first voltage, the second voltage and the position information, and the cause of the abnormality is determined.

4. The method according to claim 1 or 3, characterized in that The determining whether the battery includes a battery cell with abnormal voltage according to the first voltage, the second voltage, and the position information, and determining the cause of the abnormality, includes: If the position information of the third target battery cell corresponding to the second minimum voltage value is the same as the position information of the second target battery cell corresponding to the first minimum voltage value, it is determined that the third target battery cell is a battery cell with abnormal voltage, and the abnormality is caused by the second self-discharge abnormality.

5. The method according to claim 1 or 3, characterized in that The determining whether the battery includes a battery cell with abnormal voltage according to the first voltage, the second voltage, and the position information, and determining the cause of the abnormality, includes: If the position information of the second target battery cell corresponding to the first minimum voltage value is different from the position information of the first target battery cell corresponding to the second maximum voltage value, and the position information of the second target battery cell corresponding to the first minimum voltage value is different from the position information of the third target battery cell corresponding to the second minimum voltage value, it is determined that the battery has no abnormality.

6. The method according to claim 4, characterized in that The method further comprises: If the abnormality is caused by the second self-discharge abnormality, performing voltage balancing processing on the battery; If the battery still contains low-voltage battery cells after the voltage equalization process, a low-voltage alarm is issued.

7. A battery abnormality diagnosis device, characterized in that: include: a parameter acquisition module, configured to acquire battery parameters of the battery, wherein the battery parameters include voltage information of each battery cell of the battery at a preset state of charge; a diagnosis module, configured to determine, based on the voltage information of the battery cells, whether there is a battery cell with abnormal voltage, and determine the abnormal cause of the battery cell with abnormal voltage, wherein the abnormal cause is abnormal self-discharge; The battery parameters also include location information of the battery cells; the voltage information of each battery cell at the preset state of charge includes a first voltage corresponding to each battery cell when the state of charge of the battery is lower than a first threshold, and a second voltage corresponding to each battery cell when the state of charge of the battery is higher than a second threshold; wherein the second threshold is greater than the first threshold; Determining whether there is a battery cell with abnormal voltage for each battery cell in the battery according to the battery parameters, and determining the abnormal cause of the battery cell with abnormal voltage, including: It is determined whether the battery includes a battery cell with abnormal voltage according to the first voltage, the second voltage, and the position information, and a cause of the abnormality is determined.

8. An electronic device, characterized in that: include: processor, memory, and bus, wherein The processor and the memory communicate with each other via the bus; The memory stores program instructions that can be executed by the processor, and the processor can execute the method according to any one of claims 1 to 6 by calling the program instructions.

9. A non-transitory computer-readable storage medium, characterized in that The non-transitory computer-readable storage medium stores computer instructions, which, when executed by a computer, enable the computer to perform the method according to any one of claims 1 to 6.

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