CN117429264B

CN117429264B - Maintenance detection method of battery module, storage medium, automobile and energy storage system

Info

Publication number: CN117429264B
Application number: CN202311769932.8A
Authority: CN
Inventors: 陈召凡; 叶宏; 汪晓阳
Original assignee: Tai Shen Technology Shenzhen Co ltd
Current assignee: Tai Shen Technology Shenzhen Co ltd
Priority date: 2023-12-21
Filing date: 2023-12-21
Publication date: 2024-03-29
Anticipated expiration: 2043-12-21
Also published as: CN117429264A

Abstract

The application discloses a maintenance detection method of a battery module, a storage medium, an automobile and an energy storage system, and belongs to the technical field of new energy. The method comprises the following steps: acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the expansion force information indicates the degree of expansion between the battery to be detected and the adjacent object of the battery to be detected; and detecting the internal expansion force of the battery module to reflect the structural deformation caused by expansion, thereby completing detection and identification. Then, determining a state index of the battery module according to a preset maintenance strategy and expansion force information; the state index indicates whether the battery module needs maintenance. According to the scheme, by detecting the internal expansion force of the battery module and combining a preset maintenance strategy corresponding to an application scene and a battery structure, whether the battery module needs maintenance or not is judged, and the accuracy of a maintenance detection result is improved.

Description

Maintenance detection method of battery module, storage medium, automobile and energy storage system

Technical Field

The application relates to the technical field of new energy, in particular to a maintenance detection method of a battery module, a storage medium, an automobile and an energy storage system.

Background

For traditional energy storage power station, use infrared discernment to detect the heat signal generally, combine the mode of artifical auxiliary inspection equipment to carry out artifical inspection, and then judge whether the battery needs the maintenance according to the heat signal. However, when the battery structure is deformed abnormally, the thermal signal is not necessarily abnormal, so that the accuracy of the detection result of the conventional maintenance detection method is not high.

Disclosure of Invention

The application provides a maintenance detection method of a battery module, a storage medium, an automobile and an energy storage system, and accuracy of maintenance detection results is improved. The technical scheme is as follows:

in a first aspect, a maintenance detection method of a battery module is provided, the method including: acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the swelling force information indicates a swelling degree between the battery to be detected and an adjacent object of the battery to be detected; determining a state index of the battery module according to a preset maintenance strategy and the expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structural type and application scene of the battery module.

In a second aspect, there is provided a maintenance detection device for a battery module, the device including: the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the swelling force information indicates a swelling degree between the battery to be detected and an adjacent object of the battery to be detected; the determining module is used for determining the state index of the battery module according to a preset maintenance strategy and the expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structural type and application scene of the battery module.

In a third aspect, there is provided a maintenance detection device of a battery module, the maintenance detection device of a battery module including a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program implementing the method of the first aspect when executed by the processor.

In a fourth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a computer program, which when executed by a processor, implements the method of the first aspect.

In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.

In a sixth aspect, a maintenance detection system of a battery module is provided, the maintenance detection system of the battery module comprises a pressure sensing device, a collector and a battery management system, the collector is respectively connected with the pressure sensing device and the battery management system, and the battery module comprises a battery to be detected; the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the battery management system; the battery management system is configured to implement the method according to the first aspect according to the swelling force information.

In a seventh aspect, a new energy automobile is provided, the new energy automobile comprises a battery module, a pressure sensing device, a collector and a controller, the collector is respectively connected with the pressure sensing device and the controller, and the battery module comprises a battery to be detected; the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the controller; the controller is configured to implement the method according to the first aspect according to the expansion force information.

In an eighth aspect, an energy storage system is provided, where the energy storage system includes a battery module, a pressure sensing device, a collector and a controller, the collector is connected with the pressure sensing device and the controller, and the battery module includes a battery to be detected; the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the controller; the controller is configured to implement the method according to the first aspect according to the expansion force information.

The embodiment of the application provides a maintenance detection method, a storage medium, an automobile and an energy storage system of a battery module, and according to the scheme provided by the application, expansion force information detected by a pressure sensing device corresponding to a battery to be detected in the battery module is obtained; the expansion force information indicates the degree of expansion between the battery to be detected and the adjacent object of the battery to be detected; and detecting the internal expansion force of the battery module to reflect the structural deformation caused by expansion, thereby completing detection and identification. Then, determining a state index of the battery module according to a preset maintenance strategy and expansion force information; the state index indicates whether the battery module needs maintenance. The method comprises the steps of presetting a preset maintenance strategy according to the structure type of the battery module and an application scene, judging whether the battery module needs maintenance according to the relation between the expansion force information and the preset maintenance strategy, wherein the judgment scheme has no limit on the application scene of the battery module, and enriches the application scene of a maintenance detection method. According to the scheme, by detecting the internal expansion force of the battery module and combining a preset maintenance strategy corresponding to an application scene and a battery structure, whether the battery module needs maintenance or not is judged, and the accuracy of a maintenance detection result is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a maintenance detection system of a battery module according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of another battery module according to an embodiment of the present disclosure;

fig. 4 is a flowchart of a maintenance detection method of a battery module according to an embodiment of the present application;

fig. 5 is a schematic diagram of an interaction process of a maintenance detection method of a battery module according to an embodiment of the present application;

fig. 6 is a schematic diagram of an interaction process of another maintenance detection method of a battery module according to an embodiment of the present application;

fig. 7 is a schematic diagram of an interaction process of a maintenance detection method of a battery module according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a maintenance detection device of a battery module according to an embodiment of the present disclosure;

Fig. 9 is a schematic structural diagram of a maintenance detection device for a battery module according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that reference herein to "a plurality" means two or more. In the description of the present application, "/" means or, unless otherwise indicated, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, for the purpose of facilitating the clear description of the technical solutions of the present application, the words "first", "second", etc. are used to distinguish between the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

Before explaining the embodiments of the present application in detail, application scenarios and related techniques of the embodiments of the present application are described.

The embodiment of the application relates to the field of battery detection, and can be applied to the energy storage industry or the new energy automobile industry and the like. In the related battery maintenance detection technology, in the energy storage industry, detection and identification can not be completed for the problem of module deformation caused by internal expansion of a battery system by adopting a traditional manual inspection method. In the new energy automobile industry, low-frequency store-in maintenance has poor hysteresis, chassis battery pack unpacking inspection is not carried out, and high-frequency indiscriminate store-in inspection often brings huge economic cost and labor cost to the new energy automobile industry. Therefore, it is needed to provide a method for detecting the maintenance of the battery module, so as to solve the technical problems of insufficient fault identification and over-high maintenance cost in the existing maintenance detection means in the energy storage industry and the new energy industry, and to improve the convenience of the maintenance detection of the battery module and the reference value of the maintenance detection result by detecting the maintenance time of the battery.

The embodiment of the application provides a maintenance detection system of a battery module, which is used for executing a maintenance detection method of the battery module, as shown in fig. 1, and fig. 1 is a schematic structural diagram of the maintenance detection system of the battery module. In fig. 1, a battery module is shown with two interconnected batteries (shown as a battery 11 and a battery 12 in fig. 1), the maintenance detection system of the battery module includes a pressure sensing device 20 (shown as a film type pressure sensing device in fig. 1), a collector 30, and a battery management system 40 (Battery Management System, BMS), the collector 30 is respectively connected with the pressure sensing device 20 and the battery management system 40, the battery module includes a battery to be detected, and the battery to be detected may be the battery 11 or the battery 12; a pressure sensing device 20 for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; a collector 30 for acquiring the expansion force information of the pressure sensing device 20 and transmitting the expansion force information to the battery management system 40; the battery management system 40 is used for implementing the maintenance detection method of the battery module described in any of the embodiments below according to the expansion force information.

In this embodiment, the pressure sensing device 20 is provided with one or more detection points, and the detection points are used for sensing the expansion force of the area where the pressure sensing device is located, and the collector 30 collects the expansion force of the one or more detection points connected with the pressure sensing device and sends the expansion force to the battery management system 40. The battery management system 40 realizes maintenance detection of the battery module according to the expansion force (i.e., expansion force information) of different detection points in a period of time.

In this embodiment, at least two rechargeable batteries are disposed in the battery module, that is, the battery to be detected is a rechargeable battery, the maintenance detection system of the battery module includes a pressure sensing device 20, a collector 30 and a battery management system 40, the pressure sensing device 20 is disposed between two rechargeable batteries (for example, the battery 11 and the battery 12 in fig. 1), and the pressure sensing device 20 may be a film type pressure sensing device for acquiring expansion force information of the rechargeable battery.

It should be noted that the number of rechargeable batteries and the number of pressure sensing devices 20 in the battery module may be set according to specific requirements, and a plurality of rechargeable batteries and a plurality of pressure sensing devices may be disposed in the battery module, and these pressure sensing devices may be disposed between different rechargeable batteries. The relative position between the pressure sensing device 20 and the rechargeable battery is not particularly limited in the embodiments of the present application, as long as the expansion force can be directly or indirectly transmitted to the pressure sensing device 20 and detected by the pressure sensing device 20 when the rechargeable battery expands.

The maintenance detection method provided by the embodiment of the application is applied to a device provided with at least two rechargeable batteries, and the device can be a battery module, a battery pack provided with a plurality of battery modules or other types of devices. The battery module is a common battery integrated unit, and the embodiment of the application uses maintenance detection of the battery module as an example, and does not limit the maintenance detection object.

In this embodiment of the application, the battery module includes a plurality of rechargeable batteries, and a plurality of rechargeable batteries are arranged in an array. The batteries are provided with front faces and side faces adjacent to the front faces, the front faces of the two batteries are oppositely arranged, and the pressure sensing device 20 is clamped between the front faces of the two batteries; when a baffle is disposed between the front faces of two cells, the pressure sensing device 20 is interposed between either of the front faces of the cells and the baffle. That is, the pressure sensing device 20 is disposed between two adjacent cells, and when there is no other member between the two adjacent cells, the pressure sensing device 20 is interposed between the two adjacent cells; when a separator is provided between two adjacent cells, the pressure sensing device 20 is sandwiched between the separator and the cell to be detected. The adjacent object of the cell to be detected may be another cell adjacent to the cell to be detected, or may be an adjacent separator.

In some embodiments, the pressure sensing device 20 is a thin film pressure sensing device. On which one or more expansion force detection points are arranged, pressure data of different areas of the battery can be acquired. The type of the film type pressure sensing device is not particularly limited, and the film type pressure sensing device can only acquire the expansion force information of the surface of the rechargeable battery. Illustratively, the thin film pressure sensing device sandwiched between two rechargeable batteries is a thin film flexible pressure sensing device having a thickness of less than 0.5 mm.

As shown in fig. 2, fig. 2 is a schematic structural diagram of a battery module according to an embodiment of the present application, and the battery module shown in fig. 2 includes two batteries. Two adjacent cells are shown in a disassembled form in fig. 2 to more fully see the placement of the thin film pressure sensing device. The film type pressure sensing device comprises an expansion force sensing part, one or a plurality of detection points can be arranged on the expansion force sensing part, and the expansion force sensing part is clamped and arranged between the front surfaces of the two batteries.

The battery module in this embodiment of the present application may also include more batteries, as shown in fig. 3, fig. 3 is a schematic structural diagram of another battery module provided in this embodiment of the present application, and fig. 3 illustrates 6 batteries as an example, and the arrangement manner of the pressure sensing device 20 may be referred to the battery module illustrated in fig. 2.

It should be noted that, the battery module may include a plurality of batteries, and the dimension protection detection method of the battery module provided in the embodiment of the present application is directed to dimension protection detection of a battery (to-be-detected battery) provided with a pressure sensing device, and not all the batteries of the battery module.

The embodiment of the application provides a maintenance detection system of a battery module, which adopts the maintenance detection method described in any embodiment to carry out maintenance detection on the battery module. The maintenance detection system at least comprises a pressure sensing device (e.g. a film type pressure sensing device), a collector and a controller (e.g. a BMS). The film type pressure sensing device is used for detecting the expansion force information of the rechargeable battery, and the collector acquires the expansion force information detected by the film type pressure sensing device; the controller judges whether the battery module needs maintenance or not according to a preset maintenance strategy and expansion force information. And when the battery module needs maintenance, the controller acquires maintenance information of the battery module.

The embodiment of the application provides a maintenance detection method of a battery module, relates to the field of new energy safety detection, and is described by taking a maintenance detection system of the battery module in fig. 1 as an example. As shown in fig. 4, fig. 4 is a flowchart of a maintenance detection method of a battery module according to an embodiment of the present application, where the maintenance detection method of the battery module includes:

S101, acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the swelling force information indicates a degree of swelling between the battery to be detected and an adjacent object of the battery to be detected.

The maintenance detection method of the battery module provided by the embodiment of the application can be applied to maintenance detection of the battery module provided with a plurality of rechargeable battery monomers, and can also be used for maintenance detection of a battery pack provided with a plurality of battery modules.

A plurality of detection points are arranged between the battery to be detected and the adjacent object, and the detection points detect the pressure data of the battery to be detected and can reflect the structural deformation caused by the internal expansion of the battery module, and the pressure data are used as expansion force information to reflect the expansion degree between the battery to be detected and the adjacent object. The expansion force information may include, but is not limited to: the expansion force magnitude and the expansion force change condition (i.e., the expansion force change rate) of a single detection point, the expansion force magnitude sum of a plurality of detection points, and the change condition (i.e., the sum change rate) of the expansion force magnitude sum.

And grabbing and analyzing the expansion force information of the battery to be detected so as to judge whether maintenance is needed for the battery to be detected later.

It should be noted that, in this embodiment, one detection point corresponds to one expansion force value at one detection time. Illustratively, the detected inflation force value at the detection point is the inflation force value at the current time.

S102, determining a state index of the battery module according to a preset maintenance strategy and expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structure type and application scene of the battery module.

In the embodiment of the application, the battery module can be applied to application scenes such as an energy storage system or a new energy automobile, and the corresponding maintenance strategies are different. The types (namely, types) of the battery modules are various, and the corresponding maintenance strategies are different. Based on this, a preset maintenance policy is preset in the embodiment of the present application, and may be set appropriately by a person skilled in the art according to the structure type and application scenario of the battery module. The preset maintenance policy may be determined according to a number of different structure types and experimental thresholds of whether maintenance is required in different application scenarios.

The preset maintenance policy indicates a mapping relationship between the expansion force information interval and whether maintenance is required, for example, when the expansion force information is expansion force, the preset maintenance policy may be a mapping relationship between an expansion force threshold and whether maintenance is required, and the mapping relationship is greater than the expansion force threshold, which indicates that the battery module needs to perform maintenance; and the expansion force threshold value is smaller than or equal to the expansion force threshold value, which indicates that the battery module does not need maintenance.

It can be understood that the preset maintenance policy may be a mapping relationship between an expansion force interval and whether maintenance is required, for example, the expansion force interval may be an interval formed by 0 to an expansion force threshold, where the expansion force value falls, which indicates that the battery module does not need to perform maintenance. The expansion force value does not fall in the interval, which indicates that the battery module needs maintenance.

In some embodiments, the maintenance detection method of the battery module further includes the following steps before the expansion force information detected by the pressure sensing device is acquired: and acquiring a maintenance strategy (namely, a preset maintenance strategy) corresponding to the battery module.

Rechargeable batteries applied to battery modules in different scenes, the overall structure of the battery modules and the use environment of the battery modules may be slightly different, and the differences often cause different influences on the fault change condition of the battery modules under long-term operation. That is, the magnitude of the rechargeable battery swelling force or the change in the rechargeable battery swelling force or the rate of the rechargeable battery swelling force detected by the pressure sensing device in the different battery modules may be different when the same or similar faults occur. Therefore, if the same maintenance strategy is adopted to perform maintenance detection on the battery modules in different scenes, the detection result is often inaccurate. Based on this, in the embodiment of the present application, the battery modules applied to different scenes have the corresponding maintenance policies, for example, the use environments of the battery modules applied to the new energy automobile and the battery modules applied to the energy storage system are very different, so before the pressure detection information of the pressure sensing device is obtained, the maintenance policies corresponding to the battery modules should be obtained, so as to improve the accuracy of the maintenance detection on the battery modules.

It should be noted that, the executing entity for obtaining the preset maintenance policy and the executing entity for determining whether the battery module needs maintenance according to the preset maintenance policy and the expansion force information are the same executing entity, for example, the maintenance detection system of the battery module in fig. 1. In one embodiment, the preset maintenance policies corresponding to the battery modules in different scenarios may be stored in the cloud server, and the execution body (for example, the maintenance detection system of the battery module in fig. 1) is in communication connection with the cloud server to obtain the corresponding preset maintenance policies. In other embodiments, the preset maintenance policy corresponding to the battery module may be stored in advance in the execution body (for example, the maintenance detection system of the battery module in fig. 1 described above), and the execution body may directly call the preset maintenance policy when whether the maintenance detection is required for the battery module.

In some embodiments, based on fig. 4 described above, after S102, the maintenance detection method of the battery module further includes the following steps. When the state index indicates that the battery module needs maintenance, acquiring maintenance information of the battery module; the maintenance information is determined according to preset maintenance information, and the preset maintenance information is related to the structural type and application scene of the battery module.

The maintenance information indicates maintenance items, maintenance steps, and the like for the battery module. The maintenance information is obtained from the terminal equipment or the cloud server after the battery module is judged to need to carry out maintenance detection.

The application scenes of the battery modules are different, and the corresponding maintenance strategies are different; the battery modules are different in structure types and different in corresponding maintenance strategies. Based on this, the preset maintenance information may be appropriately set by those skilled in the art according to the structure type and application scenario of the battery module itself. For example, the preset maintenance information can be determined according to a large number of different structure types, maintenance matters under different application scenes and experimental thresholds of maintenance steps.

It should be noted that, the preset maintenance information may be set in the maintenance control device (terminal device or cloud server), and the device performing whether maintenance is needed (for example, the maintenance detection system of the battery module in fig. 1) is connected with the maintenance control device in a communication manner, and if it is determined that maintenance is needed, the state index is sent to the maintenance control device, so as to obtain the maintenance information of the battery module from the maintenance control device.

In the embodiment of the application, taking the case that the pressure sensing device is a film type pressure sensing device as an example, the expansion force information detected by the film type pressure sensing device is obtained; judging whether the battery module needs maintenance or not according to a preset maintenance strategy and expansion force information; when the battery module needs maintenance, acquiring maintenance information of the battery module; wherein the swelling force information is one or more of the swelling force magnitude of the rechargeable battery (i.e., absolute value of the swelling force), the swelling force change rate of the rechargeable battery, and the swelling force change magnitude of the rechargeable battery (i.e., relative value of the swelling force, which may be a difference between the absolute value and the initial value).

According to the embodiment of the application, the expansion force information is adopted to reflect structural deformation caused by internal expansion of the battery module, and the preset maintenance strategy is combined to judge whether the battery module needs maintenance or not.

According to the scheme provided by the application, the expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module is obtained; the expansion force information indicates the degree of expansion between the battery to be detected and the adjacent object of the battery to be detected; and detecting the internal expansion force of the battery module to reflect the structural deformation caused by expansion, thereby completing detection and identification. Then, determining a state index of the battery module according to a preset maintenance strategy and expansion force information; the state index indicates whether the battery module needs maintenance. The method comprises the steps of presetting a preset maintenance strategy according to the structure type of the battery module and an application scene, judging whether the battery module needs maintenance according to the relation between the expansion force information and the preset maintenance strategy, wherein the judgment scheme has no limit on the application scene of the battery module, and enriches the application scene of a maintenance detection method. According to the scheme, by detecting the internal expansion force of the battery module and combining a preset maintenance strategy corresponding to an application scene and a battery structure, whether the battery module needs maintenance or not is judged, and the accuracy of a maintenance detection result is improved.

In some embodiments, where the pressure sensing device includes a single detection point, the inflation force information includes at least one of: expansion force value, expansion force variation amount, and expansion force variation rate; the expansion force variation indicates a relative value between the currently detected expansion force value and the initial expansion force value; in the case where the pressure sensing device includes a plurality of detection points, the inflation force information includes at least one of: the expansion force value of each detection point, the expansion force variation amount of each detection point, the expansion force variation rate of each detection point, the sum of expansion forces of a plurality of detection points, the sum variation amount and the sum variation rate; wherein, the expansion force change rate of the detection point is: detecting a plurality of change rates detected by the point in a preset time period; or, calculating a single change rate according to the expansion force values obtained by the detection points at the starting time and the ending time of the preset time period.

In this embodiment of the present application, the pressure sensing device may be a pressure sensing device provided with one expansion force detection point (hereinafter referred to as detection point), or the pressure sensing device may be a pressure sensing device provided with a plurality of detection points. The expansion force information detected by the detection points on the different pressure sensing devices can be acquired at the same time, and the expansion force information detected by the detection points on the different pressure sensing devices can also be acquired sequentially, which is not limited in this embodiment of the present application.

It can be understood that, since the pressure sensing device is clamped between the two rechargeable batteries, when the pressure sensing device is provided with a plurality of detection points, the detection points on the pressure sensing device respectively correspond to different positions of the rechargeable batteries, and the detection points can respectively detect the expansion force information at the corresponding positions. And summing the expansion force detected by each detection point on the pressure sensing device to obtain the total expansion force detected by the pressure sensing device (the sum of the expansion forces of a plurality of detection points).

When the pressure sensing device is provided with a detection point, the expansion force information may be: the expansion force detected by the detection point (i.e., the expansion force value), the expansion force detected by the detection point (i.e., the expansion force variation amount), the expansion force detected by the detection point (i.e., the expansion force variation rate).

When the pressure sensing device is provided with a plurality of detection points, the expansion force information may be: a combination of one or more of an expansion force magnitude (i.e., an expansion force value) detected by each detection point, an expansion force magnitude change (i.e., an expansion force change amount) detected by each detection point, an expansion force change rate detected by each detection point, a total expansion force magnitude of the pressure sensing device (i.e., a sum of expansion forces of a plurality of detection points), a total expansion force magnitude change of the pressure sensing device (a sum change amount), and a total expansion force magnitude change rate of the pressure sensing device (i.e., a sum change rate).

In the embodiment of the application, the pressure sensing device is clamped between two rechargeable batteries, the initial battery module (the unused battery module) itself has an expansion force, and the different types of battery modules have different initial expansion forces. The initial expansion force value corresponds to the structural type of the battery module itself. According to the embodiment of the application, not only the expansion force value but also the expansion force variation is obtained, the expansion force value indicates the expansion force value detected at a certain moment, the expansion force variation indicates the relative value between the expansion force value detected at a certain moment and the initial expansion force value, and the comprehensiveness of the expansion force information is improved.

In the embodiment of the present application, the expansion force change rate detected by the detection point may be an expansion force change rate obtained in a preset period of time. The expansion force change speed can be a plurality of continuous change rates in a preset time period, namely, N expansion force values at N detection moments in the preset time period are taken, N is an integer larger than 1, and N-1 continuous change rates can be calculated; the expansion force change speed may be a change rate calculated from the expansion force data obtained at the start time and the end time of the preset time period, that is, 1 change rate may be calculated from the expansion force values at the start time and the end time of the preset time period. The pressure data used for calculating the expansion force change speed are continuously acquired expansion force values.

It can be understood that, due to the reason of the battery itself or the outside, when the thickness of the battery is abnormally increased or the battery is irreversibly deformed, the overall bulge deformation of the battery module is brought to a certain extent, the structural member is damaged when serious, and the battery module may be damaged when the battery module is used under the condition for a long time, thereby causing the risk problems such as thermal runaway and the like. The deformation of the battery in the early stage structure does not necessarily cause abnormal generation of thermal signals, so that the problem of deformation of the module caused by expansion of the battery cannot be detected and identified. In the embodiment of the application, the pressure sensing device is arranged between two rechargeable batteries, the expansion force generated when the rechargeable batteries expand can be directly obtained through the pressure sensing device, and the problems of abnormal increase of the pressure among the batteries caused by the expansion of the rechargeable batteries can be identified through analyzing the expansion force. The safety fault accurate positioning identification of the battery structure is realized through the related expansion force, the accuracy of the maintenance detection result is improved, the abnormal expansion of the rechargeable battery can be identified without disassembling the battery module, the input cost of the existing maintenance labor and expenses is greatly reduced, the problems of incomplete fault identification, overhigh maintenance cost and the like of the current maintenance detection means are solved, and the method has great industrial application and popularization values.

It will be appreciated that rechargeable batteries tend to experience different swelling phenomena when they experience abnormal swelling, and that these different swelling phenomena tend to correspond to different faults. For example, when the swelling force of the rechargeable battery is so great that it rapidly exceeds the swelling force threshold that the structure of the rechargeable battery itself can withstand, the rechargeable battery is liable to fail and leak; irreversible damage to the rechargeable battery may occur when the expansion force of the rechargeable battery is small but the rate of change is too fast. Based on this, in the embodiment of the present application, the determination as to whether the battery module needs to perform maintenance or not is made based on the expansion force information used, which may be one or more of the expansion force magnitude (i.e., the expansion force value) of the rechargeable battery, the expansion force change rate of the rechargeable battery, and the expansion force change magnitude (i.e., the expansion force change amount) of the rechargeable battery. Therefore, the expansion force of the rechargeable battery can be detected in different dimensions according to specific requirements, the fault information of the rechargeable battery can be more accurately identified by grabbing data in multiple dimensions, and the accuracy of maintenance detection results is improved.

In this example, by counting the local information (for example, the inflation force value, the inflation force variation rate, and the inflation force variation amount) and the whole information (for example, the sum of inflation forces, the sum variation amount, and the sum variation rate of the plurality of detection points), the comprehensiveness and diversity of the statistical information are improved, so that the abundant local information and whole information are provided in the process of judging whether the maintenance is required or not later, to improve the reliability of the maintenance detection result.

In some embodiments, a preset maintenance policy indicates a mapping relationship between the expansion force information interval and whether maintenance is required; based on the expansion force information described above, S102 in fig. 4 may also be implemented in the following manner. Under the condition that the pressure sensing device comprises a single detection point, when any condition that the expansion force value is larger than a preset expansion force threshold value, the expansion force change rate is larger than a preset expansion force change rate threshold value and the expansion force change amount is larger than a preset expansion force change amount threshold value is met, the state index indicates that the battery module needs maintenance; under the condition that the pressure sensing device comprises a plurality of detection points, when any one condition that any one expansion force value is larger than a preset expansion force threshold value, any one expansion force change rate is larger than a preset expansion force change rate threshold value, any one expansion force change quantity is larger than a preset expansion force change quantity threshold value, the sum is larger than a preset expansion force sum threshold value, the sum change quantity is larger than a preset expansion force sum change quantity threshold value and the sum change rate is larger than a preset expansion force sum change rate threshold value is met, the state index indicates that the battery module needs maintenance.

In this embodiment, when the expansion force information is the expansion force (i.e., expansion force value) of the rechargeable battery, the step of determining whether the battery module needs maintenance according to the preset maintenance policy and the expansion force information may be: judging whether the expansion force (namely, the expansion force value) of the rechargeable battery exceeds a preset expansion force threshold value or not; if the expansion force of the rechargeable battery exceeds a preset expansion force threshold, the battery module needs maintenance.

Further, when the expansion force information is the expansion force change rate of the rechargeable battery, the step of judging whether the battery module needs maintenance according to the preset maintenance strategy and the expansion force information may be: judging whether the expansion force change rate of the rechargeable battery exceeds a preset expansion force change rate threshold value; if the expansion force change rate of the rechargeable battery exceeds a preset expansion force change rate threshold, the battery module needs maintenance.

Further, when the expansion force information is the expansion force variation (i.e., expansion force variation) of the rechargeable battery, the step of determining whether the battery module needs maintenance according to the preset maintenance policy and the expansion force information may be: judging whether the expansion force change of the rechargeable battery exceeds a preset expansion force change threshold (namely, a preset expansion force change amount threshold); if the expansion force change of the rechargeable battery exceeds a preset expansion force change threshold, the battery module needs maintenance.

Further, in the case that the pressure sensing device includes a plurality of detection points, when the expansion force information is a sum of expansion forces of the plurality of detection points of the rechargeable battery, determining whether the sum of expansion forces of the rechargeable battery exceeds a preset expansion force sum threshold; if the expansion force variation of the rechargeable battery exceeds the preset expansion force sum threshold, the battery module needs maintenance.

Further, in the case where the pressure sensing device includes a plurality of detection points, when the swelling force information is a total amount of change in the swelling force of the plurality of detection points of the rechargeable battery, determining whether the total amount of change in the swelling force of the rechargeable battery exceeds a preset swelling force total amount of change threshold; if the total variation of the expansion forces of the rechargeable battery exceeds the preset threshold of the total variation of the expansion forces, the battery module needs maintenance.

Further, in the case that the pressure sensing device includes a plurality of detection points, when the swelling force information is a total change rate of the swelling force of the plurality of detection points of the rechargeable battery, determining whether the total change rate of the swelling force of the rechargeable battery exceeds a preset swelling force total change rate threshold; if the total change rate of the expansion forces of the rechargeable battery exceeds the preset total change rate threshold of the expansion forces, the battery module needs maintenance.

The preset expansion force threshold value, the preset expansion force change rate threshold value, the preset expansion force change amount threshold value, the preset expansion force sum change amount threshold value and the preset expansion force sum change rate threshold value are further descriptions of preset maintenance strategies, are examples of the preset maintenance strategies, and are related to the structure type and application scene of the battery module.

In this embodiment, when the expansion force information of the rechargeable battery includes at least one item of information, the expansion force information of the rechargeable battery satisfies any one of the above embodiments, and the battery module needs to be maintained. Moreover, in the case that the pressure sensing device includes a plurality of detection points, any detection point satisfies any of the above embodiments, and the battery module needs to be maintained. Through carrying out single comparison on the data of a plurality of dimensions, when any condition is met, the battery module is judged to need to be subjected to maintenance, and accuracy of a maintenance detection result is improved.

In some embodiments, the inflation force information includes absolute values of differences between the first inflation force value and the second inflation force value at different detection times under the preset condition; the time interval between the detection time of the first expansion force value and the detection time of the second expansion force value is larger than the preset time interval, and the preset condition is that the residual electric quantity of the battery module is the preset electric quantity, or the interval where the residual electric quantity of the battery module is located is the preset electric quantity interval.

The expansion force variation amount described above indicates a relative value between the expansion force value detected at one time and the initial expansion force value, which can be regarded as the expansion force value detected at another time. Based on this, the expansion force variation amount may also indicate a relative value between the expansion force values detected at a certain two specific times. For the convenience of distinguishing the two, the former is referred to as the expansion force variation amount, and the latter is referred to as the absolute value of the difference value.

On the basis, the step of acquiring the expansion force information of the pressure sensing device may be: acquiring a first expansion force value and a second expansion force value detected by a pressure sensing device; acquiring an absolute value of a difference value between the first expansion force value and the second expansion force value; the first expansion force value and the second expansion force value are expansion force values obtained by the pressure sensing device under the same set condition (namely, the preset condition is met), and the obtaining time interval of the first expansion force value and the second expansion force value is larger than the preset time interval.

In practical application, the pressure sensing device periodically or continuously collects the expansion force value, the BMS can know the remaining capacity of the battery module, the remaining capacity can be represented by a State of Charge (SOC) of the rechargeable battery, and the SOC can reflect the remaining capacity of the battery module, which refers to the ratio of the current remaining Charge and the rated Charge of the battery. Based on this, among the plurality of expansion force values detected by the pressure sensing device, two expansion force values (i.e., a first expansion force value and a second expansion force value) in which the remaining capacity of the battery module is identical are selected, or two expansion force values in which the interval in which the remaining capacity of the battery module is located is identical are selected, and a detection time interval between the two expansion force values is greater than a preset time interval. The absolute value of the difference between the first expansion force value and the second expansion force value is calculated as expansion force information.

In this embodiment of the present application, the SOC interval (i.e., the interval in which the remaining capacity of the battery module is located) may be any one of 90% -100%, or 80% -90%, or 70% -80%, or 60% -70%, or 50% -60%, or 40% -50%, or 30% -40%, or 20% -30%, which is not limited to this embodiment of the present application. It will be appreciated that the above SOC interval is merely illustrated as an example, and in practical applications, the setting of the SOC interval may be set according to whether the change of the normal expansion force of the rechargeable battery in the SOC interval adversely affects the detection result, and the interval in which the change of the normal expansion force caused in the charging or discharging process does not substantially affect the detected abnormal expansion force value is set as the preset power interval. For example, when the SOC of the rechargeable battery is within a certain interval (for example, between 80% and 90%), the setting of the SOC interval is reliable, that is, the interval may be regarded as a preset charge interval when the normal expansion force variation due to charge and discharge is much smaller than the abnormal expansion force variation of the rechargeable battery.

It will be appreciated that the rechargeable battery will expand normally during normal charge and discharge, for example, when the SOC of the rechargeable battery increases from 20% to 90%, the rechargeable battery expands normally to some extent; when the SOC of the rechargeable battery is reduced from 90% to 20%, the expanded rechargeable battery retracts to a certain extent; and the rechargeable battery can generate lithium precipitation phenomenon in the normal use process, and the lithium precipitation can also cause the expansion of the battery to a certain extent. Therefore, in the embodiment of the application, the fault of the rechargeable battery can be more accurately identified by detecting the expansion force values of the rechargeable battery at different detection moments under the preset condition. When the first expansion force value and the second expansion force value detected by the pressure sensing device are obtained, the first expansion force value and the second expansion force value should be the expansion force values obtained by the pressure sensing device under the same set condition. The first expansion force value and the second expansion force value should be expansion force values detected by the pressure sensing device in the same SOC condition (i.e., the remaining capacity of the battery module is a preset capacity) or the same SOC interval (i.e., the interval in which the remaining capacity of the battery module is located is a preset capacity interval) of the rechargeable battery.

In one embodiment, the first and second expansion force values are expansion force values detected by the pressure sensing device at the same SOC of the rechargeable battery. For example, the first expansion force value is obtained when the SOC of the rechargeable battery is 50%, and the corresponding second expansion force value is also obtained when the SOC of the rechargeable battery is 50%, so that the influence of the expansion force variation caused by the normal charge and discharge of the battery itself can be avoided. The accuracy of obtaining the absolute value of the difference between the first expansion force value and the second expansion force value is improved, and the accuracy of fault judgment and maintenance judgment can be further improved by obtaining the absolute value of the more accurate difference.

In another embodiment, the first expansion force value and the second expansion force value are expansion force values detected by the pressure sensing device in the same SOC interval of the rechargeable battery. For example, when the SOC of the rechargeable battery is in the 50% -60% interval, the first expansion force value is obtained by the pressure sensing device, and the corresponding second expansion force value should also be obtained when the SOC of the rechargeable battery is in the 50% -60% interval. It can be understood that in the actual operation of the battery module, according to the usage habit of the user, the charging is often stopped when the SOC of the rechargeable battery reaches a certain value, and the charging is also often started when the electric quantity of the rechargeable battery is lower than a certain value, so that the first expansion force value and the second expansion force value under the same SOC are difficult to obtain after a period of time. Therefore, in this example, the first expansion force value and the second expansion force value are expansion force values detected by the pressure sensing device in the same SOC interval of the rechargeable battery, so that the applicability of the differential absolute value obtaining mode is improved.

In some embodiments, the remaining power of the battery module indicates the remaining power of the battery module during charging; the preset time interval is greater than or equal to one day.

The preset time interval can be set according to actual conditions, the preset time interval can be 30 days, the preset time interval can also be 20 days, the preset time interval can also be 10 days, the preset time interval can also be 1 day, and the size of the preset time interval is not limited in detail.

It can be appreciated that in the embodiments of the present application, the problem of abnormal increase in the inter-cell expansion force caused by expansion of the rechargeable battery is identified by analyzing the expansion force value. The abnormal swelling of the rechargeable battery may be classified into two types, one in which abnormal swelling occurs in a short time and the other in which abnormal swelling occurs in a long time. The occurrence of abnormal swelling in a short period of time may cause thermal runaway of the rechargeable battery, and at this time, thermal runaway risk management of the rechargeable battery should be performed. The phenomenon of abnormal expansion occurring in a long time may cause some damage to the rechargeable battery, and maintenance of the rechargeable battery should be performed. Therefore, in the embodiment of the application, the time interval for acquiring the first expansion force value and the second expansion force value is limited, so that the time interval for acquiring the data twice is larger than the preset time interval, the state of the battery module is not required to be monitored in real time, the detection frequency is further reduced while the detection requirement is met, the lower risk of losing control which is required to be maintained is avoided being determined as the higher risk of losing control, and the accuracy of the maintenance detection result is improved.

Further, in the embodiment of the application, the maintenance detection can be performed on the battery module at intervals of a certain time, the maintenance detection can be performed on the battery module at intervals of 1 day, the maintenance detection can be performed on the battery module at intervals of 5 days, and the maintenance detection can be performed on the battery module at intervals of 10 days.

Illustratively, the step of obtaining expansion force information of the pressure sensing device may be: acquiring a first expansion force value and a second expansion force value detected by a pressure sensing device; acquiring an absolute value of a difference value between the first expansion force value and the second expansion force value; the first expansion force value and the second expansion force value are expansion force values obtained by the pressure sensing device under the same SOC condition of the rechargeable battery and/or in the same SOC interval, and the time interval for obtaining the first expansion force value and the second expansion force value is not less than 20 days.

In general, the abnormal expansion process of the battery module occurs during the charging process, and therefore, in this example, the first expansion force value and the second expansion force value at different detection moments are obtained under the condition that the remaining capacity of the battery module or the interval where the remaining capacity is located is identical during the charging process.

In general, thermal runaway of a rechargeable battery occurs in a short time, for example, within 1 day, and therefore, in this example, by setting the acquisition time interval between the first expansion force value and the second expansion force value to be greater than 1 day, interference caused by abnormality of the expansion force value due to thermal runaway can be reduced, and accuracy of maintenance detection results can be improved.

In some embodiments, the preset maintenance policy indicates a mapping relationship between the expansion force information interval and whether maintenance is required, and the state index indicates whether maintenance is required by the battery module and a maintenance level when maintenance is required; based on the expansion force information described above, S102 in fig. 4 may also be implemented in the following manner. When the absolute value of the difference value is larger than the first expansion force variation threshold and smaller than or equal to the second expansion force variation threshold, the state index indicates that the battery module needs to be subjected to primary maintenance; the first expansion force variation threshold and the second expansion force variation threshold are related to the structure type and application scene of the battery module; when the absolute value of the difference value is larger than the second expansion force variation threshold value, the state index indicates that the battery module needs to be subjected to secondary maintenance; the security risk degree corresponding to the second-level maintenance is greater than the security risk degree corresponding to the first-level maintenance.

When the expansion force information is the absolute value of the difference between the first expansion force value and the second expansion force value, the step of judging whether the battery module needs maintenance according to the preset maintenance strategy and the expansion force information may be: it is determined whether an absolute value of a difference between the first expansion force value and the second expansion force value exceeds a preset first expansion force variation magnitude threshold value (i.e., a first expansion force variation amount threshold value) and a second expansion force variation magnitude threshold value (i.e., a second expansion force variation amount threshold value). When the absolute value is larger than the first expansion force change size threshold value but smaller than or equal to the second expansion force change size threshold value, judging that the first-level maintenance is performed; when the absolute value is larger than the second expansion force change threshold value, judging that the second-level maintenance is performed; the security risk degree corresponding to the second-level maintenance is greater than the security risk degree corresponding to the first-level maintenance. Wherein the first inflation force variation magnitude threshold is less than the second inflation force variation magnitude threshold.

When the expansion force variation indicates an absolute value of a difference between the first expansion force value and the second expansion force value, the preset expansion force variation threshold is the first expansion force variation threshold.

The magnitude of the first expansion force change magnitude threshold and the magnitude of the second expansion force change magnitude threshold can be set according to specific battery modules, and the magnitude of the first expansion force change magnitude threshold and the magnitude of the second expansion force change magnitude threshold corresponding to different battery modules may be different. It can be appreciated that the structure, the installation mode and the use environment of the battery module applied to different scenes may be slightly different, and these differences often have different effects on the fault change condition of the battery module under long-term operation. That is, the magnitude of the battery swelling force or the variation of the battery swelling force detected by the pressure sensing device in the different battery modules may be different when the same malfunction occurs. Therefore, the magnitude of the first expansion force variation threshold and the magnitude of the second expansion force variation threshold should be set according to the structure type and application scenario of the battery module.

For example, when the acquisition time interval of the first expansion force value and the second expansion force value is 30 days, the first expansion force variation size threshold value is set to 200 kilogram force (kgf), and the second expansion force variation size threshold value is set to 500kgf. Based on this, the step of judging whether the battery module needs maintenance may be: acquiring a first expansion force value and a second expansion force value detected by a pressure sensing device, wherein the acquisition time interval of the first expansion force value and the second expansion force value is 30 days, and the first expansion force value and the second expansion force value are expansion force values acquired by the pressure sensing device under the same SOC condition of the rechargeable battery and/or in the same SOC interval; acquiring an absolute value of a difference value between the first expansion force value and the second expansion force value; judging whether the absolute value of the difference between the first expansion force value and the second expansion force value exceeds 200kgf and 500kgf; when the absolute value of the difference is greater than 200kgf but less than or equal to 500kgf, judging that the first-level maintenance is performed; when the absolute value of the difference is greater than 500kgf, it is judged as a secondary dimension.

In the embodiment of the present application, it is practical to set the first expansion force variation size threshold to 200kgf and the second expansion force variation size threshold to 500kgf. Experiments on rechargeable batteries commonly used at present show that when the absolute value of the difference value between the first expansion force value and the second expansion force value is larger than 200kgf but smaller than or equal to 500kgf within 30 days, the pressure between the rechargeable batteries in the battery module is larger, so that the battery module is abnormally swelled, and the problems of subsequent acquisition faults, structural failure, insulation faults and the like can be caused. When the absolute value of the difference between the first expansion force value and the second expansion force value is greater than 500kgf, the pressure between the rechargeable batteries in the battery module is seriously increased, so that the overall abnormal bulge of the battery module is caused, and the subsequent structural safety risk is possibly caused.

In the embodiment of the application, the absolute value of the difference value is compared with the first expansion force variation threshold value and the second expansion force variation threshold value by setting the first expansion force variation threshold value and the second expansion force variation threshold value, so that whether maintenance is needed or not and the level when maintenance is needed are determined, the diversity and the comprehensiveness of the maintenance detection method are improved, and personalized requirements of different users are met.

In some embodiments, based on the level of maintenance indicated by the state index, after S102 in fig. 4, the method further comprises the steps of: when the state index indicates that the battery module needs to perform primary maintenance, primary maintenance information of the battery module is obtained; when the state index indicates that the battery module needs to perform secondary maintenance, acquiring secondary maintenance information of the battery module; the first-level maintenance information and the second-level maintenance information are used for providing reference for maintenance operation of the battery module, and the inspection comprehensiveness corresponding to the second-level maintenance information is larger than that corresponding to the first-level maintenance information.

In this embodiment of the present application, the maintenance information (including the primary maintenance information and the secondary maintenance information) indicates maintenance items, maintenance steps, and the like for the battery module, and is used to provide a reference for the maintenance operation of the battery module. The primary maintenance information and the secondary maintenance information can be stored in the terminal equipment or the cloud server, and are acquired from the terminal equipment or the cloud server after the battery module is judged to be required to carry out maintenance detection.

The primary maintenance information and the secondary maintenance information can be appropriately set by a person skilled in the art according to the structure type and the application scene of the battery module. The first-level maintenance information corresponds to the first-level maintenance in the state index, the second-level maintenance information corresponds to the second-level maintenance in the state index, and the higher the level is, the higher the corresponding security risk degree is, and the more comprehensive and deeper the inspection is. That is, the second-level maintenance information has more checking items than the first-level maintenance information, and the second-level maintenance information has a checking step that is more complex than the first-level maintenance information.

It should be noted that the first-level maintenance information and the second-level maintenance information may be set in the maintenance control device (terminal device or cloud server), and the device performing whether maintenance is required (for example, the maintenance detection system of the battery module in fig. 1) is in communication connection with the maintenance control device, and if it is determined that maintenance is required, the state index (including the first-level maintenance and the second-level maintenance) is sent to the maintenance control device, so as to obtain the maintenance information (including the first-level maintenance information and the second-level maintenance information) of the battery module from the maintenance control device.

In the embodiment of the application, the maintenance information corresponding to the maintenance levels is acquired when the battery module needs to be maintained by setting the maintenance information corresponding to the maintenance levels, so that the diversity and the comprehensiveness of the maintenance detection method are improved, and the personalized requirements of different users are met.

In the following, an exemplary application of the embodiments of the present application in a practical application scenario will be described.

The embodiment of the application provides a maintenance detection method of a battery module, which comprises the following steps: acquiring a preset maintenance strategy corresponding to the battery module; and acquiring a first expansion force value and a second expansion force value detected by the pressure sensing device, wherein the acquisition time interval of the first expansion force value and the second expansion force value is 30 days, and the first expansion force value and the second expansion force value are expansion force values acquired by the pressure sensing device under the same SOC condition of the rechargeable battery and/or in the same SOC interval. The absolute value of the difference between the first expansion force value and the second expansion force value is obtained, and whether the absolute value exceeds 200kgf and 500kgf is judged. When the absolute value is greater than 200kgf but less than or equal to 500kgf, judging that the first-level maintenance is performed; when the absolute value is greater than 500kgf, it is judged as a secondary maintenance. When the battery module needs to perform primary maintenance, primary maintenance information of the battery module is acquired; and when the battery module needs to perform secondary maintenance, acquiring secondary maintenance information of the battery module.

In this scheme, through obtaining the inflation power information of waiting to detect the battery surface, realize accurate location and the discernment of battery structure safety failure. Meanwhile, aiming at the battery modules under different application scenes (such as new energy automobiles, energy storage power stations and the like), corresponding active screening and active maintenance pushing strategies are further formulated, the input cost of the existing maintenance manpower and expenses is greatly reduced, and the method has great industrial application value.

In some embodiments, the embodiments of the present application further provide a maintenance detection method of a battery module, including the following steps: acquiring expansion force information, temperature information, internal resistance information and gas concentration information corresponding to a battery to be detected; and determining the state index of the battery module according to the expansion force information, the temperature information, the internal resistance information and the gas concentration information.

In this embodiment of the present application, a temperature sensor for acquiring an internal temperature of the battery module, an internal resistance sensor for acquiring an internal resistance of the battery, a gas sensor for acquiring a gas concentration in the battery module, and the like may be further provided in the battery module. When the sensor is combined with the pressure sensing device to maintain the battery module, whether the battery module needs maintenance or not is judged according to the expansion force information, the temperature information, the internal resistance information and the gas concentration information and the comprehensive maintenance strategy.

The comprehensive maintenance policy refers to a policy after comprehensively considering the expansion force information, the temperature information, the internal resistance information and the gas concentration information, for example, judging whether the expansion force value is greater than a preset expansion force threshold, judging whether the expansion force change rate is greater than a preset expansion force change rate threshold, judging whether the expansion force change amount is greater than a preset expansion force change amount threshold, judging whether the temperature value is greater than a preset temperature threshold, judging whether the temperature change rate is greater than a preset temperature change rate, judging whether the internal resistance value is greater than a preset internal resistance threshold, judging whether the internal resistance change rate is greater than a preset internal resistance change rate, judging whether the gas concentration value is greater than a preset gas concentration threshold, and the like. The comprehensive maintenance policy may be any two dimensions (e.g., an expansion force value and a temperature value) or a combination of more than two dimensions, and the embodiments of the present application are not limited thereto.

Whether maintenance is needed or not is judged by comprehensively considering information of multiple dimensions, accuracy of maintenance detection results is improved, and comprehensiveness and accuracy of maintenance of faults of the battery module are improved.

In some embodiments, the maintenance detection method of the battery module is applied to a battery management system (for example, the battery management system 40 shown in fig. 1), and the battery management system is in communication connection with a maintenance control device, wherein the maintenance control device is a cloud server or a terminal device. As shown in fig. 5, fig. 5 is a schematic diagram of an interaction process of a maintenance detection method of a battery module according to an embodiment of the present application.

S201, the expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module is obtained.

Wherein the swelling force information indicates a degree of swelling between the battery to be detected and an adjacent object of the battery to be detected.

S202, determining a state index of the battery module according to a preset maintenance strategy and expansion force information.

The state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structure type and application scene of the battery module.

The implementation manner and the achieved technical effects of S201 and S202 may be referred to the descriptions of S101 and S102, and are not described herein.

And S203, when the state index indicates that the battery module needs maintenance, sending the state index to maintenance control equipment.

S204, the maintenance control equipment determines target maintenance information of the battery module according to preset maintenance information based on the state index.

The preset maintenance information is related to the structural type and application scene of the battery module.

S205, the maintenance control device sends target maintenance information to the battery management system.

In the embodiment of the application, the preset maintenance information is stored in the maintenance control device, and when the battery module needs to be maintained, the battery management system sends the state index to the maintenance control device, so that the maintenance control device determines the target maintenance information of the battery module according to the preset maintenance information based on the state index, and sends the target maintenance information to the battery management system.

When the state index indicates that the battery module needs maintenance and does not relate to the maintenance level, the preset maintenance information is target maintenance information. When the state index indicates that the battery module needs to be subjected to maintenance and the maintenance level, the preset maintenance information comprises primary maintenance information and secondary maintenance information. The maintenance control device may determine maintenance information corresponding to the maintenance level according to the maintenance level, and use the maintenance information as target maintenance information.

The execution subjects of S201 and S202 may be energy management systems (Energy Management System, EMS), and correspondingly S203 to S205 are information transmission and reception between the Energy Management Systems (EMS) and the maintenance control device.

The execution body for acquiring the expansion force information detected by the pressure sensing device is not particularly limited, and as a possible implementation manner, the expansion force information detected by the pressure sensing device may be acquired by a Battery Management System (BMS); as another possible embodiment, the expansion force information detected by the pressure sensing device may be acquired by an Energy Management System (EMS); also as a possible implementation, the expansion force information detected by the pressure sensing device may be obtained by other systems.

The execution subject for determining whether the battery module needs maintenance is not particularly limited. In one possible embodiment, the execution body for acquiring the expansion force information detected by the pressure sensing device may be further used to determine whether the battery module needs maintenance. For example, when the executing body for acquiring the expansion force information detected by the pressure sensing device and the executing body for determining whether the battery module needs maintenance are both battery management systems, the battery management systems first acquire the expansion force information detected by the pressure sensing device, and then determine whether the battery module needs maintenance according to the maintenance policy and the expansion force information.

The embodiment of the application provides different execution bodies for executing the maintenance detection method, and increases the application scenes of the maintenance detection method so as to meet the personalized requirements of different users.

In some embodiments, the maintenance detection method of the battery module is applied to a cloud server, the cloud server is in communication connection with the battery management system, and preset maintenance information is stored in the cloud server. As shown in fig. 6, fig. 6 is a schematic diagram illustrating an interaction process of another dimension protection detection method for a battery module according to an embodiment of the present application.

And S301, the battery management system sends expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module to the cloud server.

S302, determining a state index of the battery module according to a preset maintenance strategy and expansion force information.

And S303, when the state index indicates that the battery module needs maintenance, determining target maintenance information of the battery module according to preset maintenance information.

In the embodiment of the application, the preset maintenance information is stored in the cloud server, the cloud server acquires expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module from the battery management system, and whether the battery module needs maintenance or not is judged according to the preset maintenance strategy and the expansion force information. When the battery module needs to be maintained, the cloud server can determine target maintenance information according to preset maintenance information stored by the cloud server.

In this embodiment of the present application, an execution body for determining whether the battery module needs maintenance and an execution body for acquiring the expansion force information detected by the pressure sensing device are different execution bodies, and the two execution bodies are in communication connection. For example, when the executing body for acquiring the expansion force information detected by the pressure sensing device is a battery management system and the executing body for judging whether the battery module needs maintenance is a cloud server, the cloud server is in communication connection with the battery management system, the battery management system transmits the acquired expansion force information to the cloud server, and the cloud server judges whether the battery module needs maintenance according to the maintenance strategy and the expansion force information.

It should be noted that, the execution bodies of S302 and S303 may be terminal devices, and the preset maintenance information is stored in the terminal devices, and correspondingly, S301 is information interaction between the terminal devices and the battery management system. That is, in the embodiment of the present application, the execution body for obtaining the preset maintenance information of the battery module is not specifically limited, and the execution body may be a terminal device, or may be a cloud server.

In some embodiments, the maintenance detection method of the battery module is applied to a cloud server, the cloud server is respectively in communication connection with a battery management system and a terminal device, preset maintenance information is stored in the terminal device, as shown in fig. 7, and fig. 7 is an interaction process schematic diagram of the maintenance detection method of the battery module provided by the embodiment of the application.

S401, the battery management system sends expansion force information detected by a pressure sensing device corresponding to a battery to be detected in the battery module to the cloud server.

S402, determining a state index of the battery module according to a preset maintenance strategy and expansion force information.

S403, receiving preset maintenance information sent by the terminal equipment.

And S404, when the state index indicates that the battery module needs maintenance, determining target maintenance information of the battery module according to preset maintenance information.

In the embodiment of the application, the preset maintenance information is stored in the terminal equipment, the cloud server acquires expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module from the battery management system, and whether the battery module needs maintenance or not is judged according to the preset maintenance strategy and the expansion force information. The cloud server acquires preset maintenance information from the terminal equipment in advance, and when maintenance needs to be carried out on the battery module, the cloud server can determine target maintenance information according to the preset maintenance information.

Further, if the executing body of the maintenance detection method is a cloud server, when the battery module needs to perform maintenance, the corresponding maintenance information needs to be transmitted to the terminal device or a platform serving the terminal device according to the judgment result. For example, the maintenance information may be directly sent to the user terminal, and the user terminal obtains the relevant maintenance information; the maintenance information can also be sent to a platform serving the terminal equipment, and the platform contacts the user after acquiring the maintenance information to remind the user to carry out maintenance on the battery module.

It can be understood that the three steps of acquiring the expansion force information, judging whether maintenance is needed or not, and determining the maintenance information can be correspondingly executed by three different execution subjects, or the three steps can be executed by two execution subjects.

Based on the maintenance detection method of the battery module provided in the foregoing embodiment, fig. 8 is a schematic structural diagram of a maintenance detection device of the battery module provided in the embodiment of the present application. The apparatus may be implemented as part or all of a computer device by software, hardware, or a combination of both. Referring to fig. 8, the maintenance detecting device 80 of the battery module includes: an obtaining module 801, configured to obtain expansion force information detected by a pressure sensing device corresponding to a battery to be detected in the battery module; the expansion force information indicates the degree of expansion between the battery to be detected and the adjacent object of the battery to be detected; a determining module 802, configured to determine a state index of the battery module according to a preset maintenance policy and expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structure type and application scene of the battery module.

Optionally, in the case where the pressure sensing device comprises a single detection point, the inflation force information comprises at least one of: expansion force value, expansion force variation amount, and expansion force variation rate; the expansion force variation indicates a relative value between the currently detected expansion force value and the initial expansion force value; in the case where the pressure sensing device includes a plurality of detection points, the inflation force information includes at least one of: the expansion force value of each detection point, the expansion force variation amount of each detection point, the expansion force variation rate of each detection point, the sum of expansion forces of a plurality of detection points, the sum variation amount and the sum variation rate; wherein, the expansion force change rate of the detection point is: detecting a plurality of change rates detected by the point in a preset time period; or, calculating a single change rate according to the expansion force values obtained by the detection points at the starting time and the ending time of the preset time period.

Optionally, a preset maintenance policy indicates a mapping relationship between the expansion force information interval and whether maintenance is required;

the determining module 802 is further configured to, in a case where the pressure sensing device includes a single detection point, indicate that the battery module needs maintenance when any one of the conditions that any one of the expansion force value is greater than the preset expansion force threshold, any one of the expansion force change rate is greater than the preset expansion force change rate threshold, and any one of the expansion force change amount is greater than the preset expansion force change amount threshold is satisfied; under the condition that the pressure sensing device comprises a plurality of detection points, when any one condition that any one expansion force value is larger than a preset expansion force threshold value, any one expansion force change rate is larger than a preset expansion force change rate threshold value, any one expansion force change quantity is larger than a preset expansion force change quantity threshold value, the sum is larger than a preset expansion force sum threshold value, the sum change quantity is larger than a preset expansion force sum change quantity threshold value and the sum change rate is larger than a preset expansion force sum change rate threshold value is met, the state index indicates that the battery module needs maintenance.

Optionally, the inflation force information includes an absolute value of a difference between the first inflation force value and the second inflation force value at different detection times when the preset condition is satisfied; the time interval between the detection time of the first expansion force value and the detection time of the second expansion force value is larger than the preset time interval, and the preset condition is that the residual electric quantity of the battery module is the preset electric quantity, or the interval where the residual electric quantity of the battery module is located is the preset electric quantity interval.

Optionally, a preset maintenance policy indicates a mapping relationship between the expansion force information interval and whether maintenance is required, and a state index indicates whether maintenance is required by the battery module and a maintenance level when maintenance is required;

the determining module 802 is further configured to indicate that the battery module needs to perform primary maintenance when the absolute value of the difference is greater than the first expansion force variation threshold and less than or equal to the second expansion force variation threshold; the first expansion force variation threshold and the second expansion force variation threshold are related to the structure type and application scene of the battery module; when the absolute value of the difference value is larger than the second expansion force variation threshold value, the state index indicates that the battery module needs to be subjected to secondary maintenance; the security risk degree corresponding to the second-level maintenance is greater than the security risk degree corresponding to the first-level maintenance.

Optionally, the obtaining module 801 is further configured to obtain first-level maintenance information of the battery module when the state index indicates that the battery module needs first-level maintenance; when the state index indicates that the battery module needs to perform secondary maintenance, acquiring secondary maintenance information of the battery module; the first-level maintenance information and the second-level maintenance information are used for providing reference for maintenance operation of the battery module, and the inspection comprehensiveness corresponding to the second-level maintenance information is larger than that corresponding to the first-level maintenance information.

Optionally, the remaining capacity of the battery module indicates the remaining capacity of the battery module in the charging process; the preset time interval is greater than or equal to one day.

Optionally, the acquiring module 801 is further configured to acquire temperature information, internal resistance information, and gas concentration information corresponding to the battery to be detected;

the determining module 802 is further configured to determine a state index of the battery module according to the expansion force information, the temperature information, the internal resistance information, and the gas concentration information.

Optionally, the maintenance detection method of the battery module is applied to a battery management system, the battery management system is in communication connection with a maintenance control equipment system, and the maintenance control equipment system is a cloud server or terminal equipment;

The maintenance detection device 80 of the battery module includes a communication module 803;

the communication module 803 is configured to send a state index to the maintenance control device system when the state index indicates that the battery module needs maintenance, so that the maintenance control device system determines target maintenance information of the battery module according to preset maintenance information; the preset maintenance information is related to the structure type and application scene of the battery module; and receiving target maintenance information sent by the maintenance control equipment system.

Optionally, the maintenance detection method of the battery module is applied to a cloud server, and the cloud server is in communication connection with the battery management system;

the obtaining module 801 is further configured to obtain expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module from the battery management system.

Optionally, the cloud server is in communication connection with the terminal device;

the acquiring module 801 is further configured to acquire preset maintenance information from a terminal device; the preset maintenance information is related to the structure type and application scene of the battery module;

the determining module 802 is further configured to determine, when the state index indicates that the battery module needs maintenance, target maintenance information of the battery module according to preset maintenance information.

It should be noted that, when the maintenance detection device for a battery module provided in the foregoing embodiment detects whether the battery module needs maintenance, only the division of the foregoing functional modules is used for illustrating, in practical application, the foregoing functional allocation may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

The functional units and modules in the above embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the embodiments of the present application.

The maintenance detection device of the battery module provided in the above embodiment and the maintenance detection method embodiment of the battery module belong to the same concept, and specific working processes and technical effects brought by the units and the modules in the above embodiment can be referred to in the method embodiment section, and are not repeated herein.

Based on the method for detecting the maintenance of the battery module provided in the foregoing embodiment, fig. 9 is a schematic structural diagram of a device for detecting the maintenance of the battery module provided in the embodiment of the present application, as shown in fig. 9, where the device 90 for detecting the maintenance of the battery module includes: the battery module maintenance detection method in the above embodiment is implemented by the processor 901, the memory 902, and the computer program 903 stored in the memory 902 and executable on the processor 901, when the processor 901 executes the computer program 903.

The maintenance detecting device 90 of the battery module may be a general-purpose computer device or a special-purpose computer device. In a specific implementation, the maintenance detection device 90 of the battery module may be a desktop computer, a portable computer, a network server, a palm computer, a mobile phone, a tablet computer, a wireless terminal device, a communication device or an embedded device, and the embodiment of the present application does not limit the type of the maintenance detection device 90 of the battery module. It will be understood by those skilled in the art that fig. 9 is merely an example of the maintenance detection device 90 of the battery module, and does not constitute a limitation of the maintenance detection device 90 of the battery module, and may include more or less components than those illustrated, or may combine some components, or different components, such as an input-output device, a network access device, and the like.

The processor 901 may be a central processing unit (Central Processing Unit, CPU), the processor 901 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or may be any conventional processor.

The memory 902 may be an internal storage unit of the maintenance detection device 90 of the battery module in some embodiments, such as a hard disk or a memory of the maintenance detection device 90 of the battery module. The memory 902 may also be an external storage device of the maintenance detection device 90 of the battery module in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the maintenance detection device 90 of the battery module. Further, the memory 902 may also include both an internal storage unit and an external storage device of the maintenance detection device 90 of the battery module. The memory 902 is used to store an operating system, application programs, boot Loader (Boot Loader), data, and other programs, etc. The memory 902 may also be used to temporarily store data that has been output or is to be output.

The embodiment of the application also provides a maintenance detection device of a battery module, which comprises: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, which when executed by the processor performs the steps of any of the various method embodiments described above.

The present application also provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the respective method embodiments described above.

The present embodiments provide a computer program product which, when run on a computer, causes the computer to perform the steps of the various method embodiments described above.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. With such understanding, the present application implements all or part of the flow of the above-described method embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, may implement the steps of the above-described method embodiments. Wherein the computer program comprises computer program code which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal device, recording medium, computer Memory, ROM (Read-Only Memory), RAM (Random Access Memory ), CD-ROM (Compact Disc Read-Only Memory), magnetic tape, floppy disk, optical data storage device, and so forth. The computer readable storage medium mentioned in the present application may be a non-volatile storage medium, in other words, a non-transitory storage medium.

The embodiment of the application also provides a new energy automobile, which comprises a battery module, a pressure sensing device, a collector and a controller, wherein the collector is respectively connected with the pressure sensing device and the controller, and the battery module comprises a battery to be detected; the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the controller; and the controller is used for realizing the maintenance detection method of the battery module according to any embodiment according to the expansion force information.

In this embodiment of the present application, the main body of the new energy automobile executing the maintenance detection method may be a controller, and its function is equivalent to that of the battery management system in fig. 1, and the implementation process and the achieved technical effects of the maintenance detection may be referred to the description of fig. 1, which is not repeated herein.

In some embodiments, the new energy automobile further comprises a central control system, the central control system is connected with a maintenance control device, and the maintenance control device is a cloud server or a terminal device; the central control system is used for receiving the target maintenance information sent by the maintenance control equipment; when the target maintenance information is primary maintenance information, generating a risk list of the new energy automobile according to the primary maintenance information; the risk list is used for prompting attention to the running condition of the new energy automobile; when the target maintenance information is the secondary maintenance information, generating first prompt information according to the secondary maintenance information; the first prompt message is used for prompting unpacking inspection on the battery module.

The embodiment of the application also provides a system for the new energy automobile, when the maintenance of the battery module used in the new energy automobile is required, the central control system can generate a maintenance scheme according to the maintenance information, and the maintenance scheme comprises a risk list and first prompt information.

Illustratively, for a primary dimension: the method does not interfere with the operation of a local normal function strategy, and synchronizes information such as vehicle global positioning system (Global Positioning System, GPS) coordinate information, vehicle owner registration mobile phone numbers, vehicle identification codes (Vehicle Identification Number, VIN) and the like with vehicle abnormal module number information and the like, and pushes the information to a terminal information presentation Unit (Head Unit & Telecommatics, HUT) at a vehicle end, a vehicle operation and maintenance service platform and an after-sales service platform. The relevant platform adds the vehicle to the risk list and focuses on the following vehicle operation conditions. For the second-level dimension protection: the operation of the local normal function strategy is not interfered, and the user is prompted to enter the store battery maintenance and inspection through an automobile central control HUT, or an Application (APP), or a mobile phone short message. Synchronizing information such as GPS coordinate information of a vehicle, a vehicle owner registration mobile phone number, a vehicle frame number VIN number and the like with vehicle abnormal module number information and the like, and pushing the information to a vehicle end HUT, a vehicle operation and maintenance service platform and an after-sales service platform; after a specific vehicle subjected to active screening enters a store, vehicle-to-electric separation and battery pack unpacking inspection are carried out, and the conditions of module deformation, abnormal smell, liquid leakage and the like are inspected.

In this scheme, through obtaining the inflation power information of waiting to detect the battery surface, realize accurate location and the discernment of battery structure safety failure. Meanwhile, aiming at the battery module under the application scene of the new energy automobile, a corresponding active screening and active maintenance pushing strategy (namely, a risk list is formulated and first prompt information is generated) is further formulated so as to prompt a user to execute a corresponding maintenance flow, and the maintenance detection efficiency is improved.

The embodiment of the application also provides an energy storage system, which comprises a battery module, a pressure sensing device, a collector and a controller, wherein the collector is respectively connected with the pressure sensing device and the controller, and the battery module comprises a battery to be detected; the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected; the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the controller; and the controller is used for realizing the maintenance detection method of the battery module according to any embodiment according to the expansion force information.

In this embodiment of the present application, the main body of the energy storage system for executing the maintenance detection method may be a controller, and the function of the controller is equivalent to that of the battery management system in fig. 1, and the implementation process and the achieved technical effects of the maintenance detection may be referred to the description of fig. 1 and will not be repeated herein.

In some embodiments, the energy storage system further comprises an energy management system, the energy management system is connected with a maintenance control device, and the maintenance control device is a cloud server or a terminal device; the energy management system is used for receiving the target maintenance information sent by the maintenance control equipment; when the target maintenance information is the primary maintenance information, generating second prompt information according to the primary maintenance information; the second prompt information is used for prompting maintenance and investigation of the battery module; when the target maintenance information is the secondary maintenance information, generating third prompt information according to the primary maintenance information; the third prompt message is used for prompting to carry out unpacking inspection on the battery module.

The embodiment of the application also provides an energy storage system, such as an energy storage power station, a power grid and the like. When the battery module used in the energy storage system needs to be maintained, the energy management system can generate a maintenance scheme according to the maintenance information, and the maintenance scheme comprises second prompt information and third prompt information.

Illustratively, for a primary dimension: the energy management system feeds back maintenance prompt information and a position number of a cabinet-cluster-pack-module corresponding to the fault to a service APP or an after-sales service platform website to perform accurate active maintenance and investigation, so that risk hidden danger is solved. For the second-level dimension protection: the method has the advantages that the local normal functions and strategy operation are not affected, only a webpage or a system management interface is used for prompting staff, and the manager performs battery module (pack) unpacking inspection, module deformation quantity inspection, sampling harness state, abnormal smell, leakage and other conditions according to field equipment and area maintenance personnel.

In this scheme, through obtaining the inflation power information of waiting to detect the battery surface, realize accurate location and the discernment of battery structure safety failure. Meanwhile, aiming at the battery module under the application scene of the energy storage system, a corresponding active screening and active maintenance pushing strategy (namely, generating second prompt information and third prompt information) is further formulated so as to prompt a user to execute a corresponding maintenance flow, and the maintenance detection efficiency is improved.

It should be understood that all or part of the steps to implement the above-described embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer instructions may be stored in the computer-readable storage medium described above.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. The maintenance detection method of the battery module is characterized by comprising the following steps:

acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the swelling force information indicates a swelling degree between the battery to be detected and an adjacent object of the battery to be detected;

determining a state index of the battery module according to a preset maintenance strategy and the expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structure type and application scene of the battery module, the preset maintenance strategy indicates the mapping relation between an expansion force information interval and whether maintenance is needed or not, and the application scene indicates the execution equipment of the maintenance detection method, and the execution equipment comprises an energy storage system, a new energy automobile and a maintenance detection system;

The expansion force information comprises absolute values of differences between a first expansion force value and a second expansion force value at different detection moments under the condition that preset conditions are met; the time interval between the detection time of the first expansion force value and the detection time of the second expansion force value is larger than a preset time interval, and the preset condition is that the residual electric quantity of the battery module is preset electric quantity, or the interval where the residual electric quantity of the battery module is located is a preset electric quantity interval;

in the case where the pressure sensing means comprises a single detection point, the expansion force information comprises at least one of: expansion force value, expansion force variation amount, and expansion force variation rate; the expansion force variation indicates a relative value between the currently detected expansion force value and the initial expansion force value;

in the case where the pressure sensing means includes a plurality of detection points, the expansion force information includes at least one of: the expansion force value of each detection point, the expansion force variation amount of each detection point, the expansion force variation rate of each detection point, the sum of the expansion forces of the plurality of detection points, the sum variation amount, and the sum variation rate;

wherein the expansion force change rate of the detection point is as follows: a plurality of change rates detected by the detection point in a preset time period; or, calculating a single change rate according to the expansion force values obtained by the detection point at the starting time and the ending time of the preset time period.

2. The method of claim 1, wherein the determining the state index of the battery module according to a preset maintenance strategy and the expansion force information comprises:

under the condition that the pressure sensing device comprises a single detection point, when any condition that the expansion force value is larger than a preset expansion force threshold value, the expansion force change rate is larger than a preset expansion force change rate threshold value and the expansion force change amount is larger than a preset expansion force change amount threshold value is met, the state index indicates that the battery module needs maintenance;

under the condition that the pressure sensing device comprises a plurality of detection points, when any condition that any expansion force value is larger than a preset expansion force threshold value, any expansion force change rate is larger than a preset expansion force change rate threshold value, any expansion force change amount is larger than a preset expansion force change amount threshold value, the sum is larger than a preset expansion force sum threshold value, the sum change amount is larger than a preset expansion force sum change amount threshold value and the sum change rate is larger than a preset expansion force sum change rate threshold value is met, the state index indicates that maintenance of the battery module is needed.

3. The method of claim 1, wherein the state index indicates whether the battery module requires maintenance and a level of maintenance when maintenance is required;

the determining the state index of the battery module according to the preset maintenance strategy and the expansion force information comprises the following steps:

when the absolute value of the difference value is larger than a first expansion force variation threshold and smaller than or equal to a second expansion force variation threshold, the state index indicates that the battery module needs to be subjected to primary maintenance; the first expansion force variation threshold and the second expansion force variation threshold are related to the structure type and application scene of the battery module;

when the absolute value of the difference value is larger than the second expansion force variation threshold value, the state index indicates that the battery module needs to be subjected to secondary maintenance; the security risk degree corresponding to the secondary maintenance is greater than the security risk degree corresponding to the primary maintenance.

4. A method as claimed in claim 3, wherein the method further comprises:

when the state index indicates that the battery module needs to perform primary maintenance, primary maintenance information of the battery module is obtained;

When the state index indicates that the battery module needs to perform secondary maintenance, acquiring secondary maintenance information of the battery module;

the primary maintenance information and the secondary maintenance information are used for providing reference for maintenance operation of the battery module, and the inspection comprehensiveness corresponding to the secondary maintenance information is larger than that corresponding to the primary maintenance information.

5. The method of claim 1, wherein a remaining capacity of the battery module indicates a remaining capacity of the battery module during charging; the preset time interval is greater than or equal to one day.

6. The method of any one of claims 1-5, wherein the method further comprises:

acquiring temperature information, internal resistance information and gas concentration information corresponding to the battery to be detected;

and determining a state index of the battery module according to the expansion force information, the temperature information, the internal resistance information and the gas concentration information.

7. The method according to any one of claims 1-5, wherein the method is applied to a battery management system, the battery management system being communicatively connected to a maintenance control device, the maintenance control device being a cloud server or a terminal device;

After determining the state index of the battery module according to the preset maintenance strategy and the expansion force information, the method further comprises:

when the state index indicates that the battery module needs maintenance, the state index is sent to the maintenance control equipment, so that the maintenance control equipment determines target maintenance information of the battery module according to preset maintenance information; the preset maintenance information is related to the structural type and application scene of the battery module;

and receiving the target maintenance information sent by the maintenance control equipment.

8. The method of any one of claims 1-5, wherein the method is applied to a cloud server communicatively coupled to a battery management system;

the obtaining of the expansion force information detected by the pressure sensing device corresponding to the battery to be detected in the battery module comprises the following steps:

and acquiring expansion force information detected by a pressure sensing device corresponding to the battery to be detected in the battery module from the battery management system.

9. The method of claim 8, wherein the cloud server is communicatively connected to a terminal device; the method further comprises the steps of:

Acquiring preset maintenance information from the terminal equipment; the preset maintenance information is related to the structural type and application scene of the battery module;

and when the state index indicates that the battery module needs maintenance, determining target maintenance information of the battery module according to the preset maintenance information.

10. A maintenance detection device for a battery module, the device comprising:

the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring expansion force information detected by a pressure sensing device corresponding to a battery to be detected in a battery module; the swelling force information indicates a swelling degree between the battery to be detected and an adjacent object of the battery to be detected;

the determining module is used for determining the state index of the battery module according to a preset maintenance strategy and the expansion force information; the state index indicates whether the battery module needs maintenance or not; the preset maintenance strategy is related to the structure type and application scene of the battery module, the preset maintenance strategy indicates the mapping relation between an expansion force information interval and whether maintenance is needed or not, and the application scene indicates the execution equipment of the maintenance detection method, and the execution equipment comprises an energy storage system, a new energy automobile and a maintenance detection system;

11. A maintenance detection device of a battery module, characterized in that the maintenance detection device of a battery module comprises a memory, a processor and a computer program stored in the memory and executable on the processor, which computer program, when executed by the processor, implements the method according to any one of claims 1-9.

12. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method according to any of claims 1-9.

13. The maintenance detection system of the battery module is characterized by comprising a pressure sensing device, a collector and a battery management system, wherein the collector is respectively connected with the pressure sensing device and the battery management system, and the battery module comprises a battery to be detected;

the pressure sensing device is used for detecting expansion force information between the battery to be detected and an adjacent object of the battery to be detected;

the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the battery management system;

The battery management system for implementing the method according to any one of claims 1-9 based on the swelling force information.

14. The new energy automobile is characterized by comprising a battery module, a pressure sensing device, a collector and a controller, wherein the collector is respectively connected with the pressure sensing device and the controller, and the battery module comprises a battery to be detected;

the collector is used for acquiring the expansion force information of the pressure sensing device and sending the expansion force information to the controller;

the controller being adapted to implement the method according to any one of claims 1-9 based on the expansion force information.

15. The new energy automobile of claim 14, further comprising a central control system, wherein the central control system is connected with a maintenance control device, and the maintenance control device is a cloud server or a terminal device;

the central control system is used for receiving the target maintenance information sent by the maintenance control equipment; when the target maintenance information is primary maintenance information, generating a risk list of the new energy automobile according to the primary maintenance information; the risk list is used for prompting attention to the running condition of the new energy automobile; when the target maintenance information is the secondary maintenance information, generating first prompt information according to the secondary maintenance information; the first prompt message is used for prompting to carry out unpacking inspection on the battery module.

16. The energy storage system is characterized by comprising a battery module, a pressure sensing device, a collector and a controller, wherein the collector is respectively connected with the pressure sensing device and the controller, and the battery module comprises a battery to be detected;

17. The energy storage system of claim 16, further comprising an energy management system, the energy management system being coupled to a maintenance control device, the maintenance control device being a cloud server or a terminal device;

the energy management system is used for receiving the target maintenance information sent by the maintenance control equipment; when the target maintenance information is the primary maintenance information, generating second prompt information according to the primary maintenance information; the second prompt information is used for prompting maintenance and investigation of the battery module; when the target maintenance information is the secondary maintenance information, generating third prompt information according to the primary maintenance information; the third prompt message is used for prompting to carry out unpacking inspection on the battery module.