Power battery expansion force boundary detection method and performance degradation mitigation method

Abstract

The application provides a power battery swelling force boundary detection method and a performance attenuation alleviation method. A battery cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between a side surface of the battery cell and the constant gap clamp. The swelling force boundary detection method comprises the following steps: in a cyclic charging and discharging process of the battery cell, a stress area and a swelling force collected by the pressure sensor are obtained according to a preset sampling frequency; target stress area and target swelling force when an inflection point appears are determined based on the obtained stress area and swelling force; and the target swelling force is taken as a swelling force boundary. The swelling force of the battery cell can be detected in real time in the actual working condition of the power battery, and the stress area corresponding to the inflection point of the battery cell attenuation and the swelling force boundary of the battery cell attenuation can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and particularly relates to a power battery swelling force boundary detection method and a performance attenuation alleviation method and device. BACKGROUND

[0002] Lithium ion batteries have the advantages of light weight, large energy storage, long service life, wide temperature adaptation range, etc., and thus gradually gain favor of people, and gradually replace other traditional batteries in the fields of energy storage and power batteries.

[0003] The cell of a power battery may swell and deform during use, and the force of swelling and deformation is referred to as swelling force. With use of the power battery, the swelling force may be abnormal, and the cell may cause performance attenuation due to the abnormal swelling force. In the related art, the swelling force of the cell cannot be detected in real time during actual working conditions of the power battery, and the abnormal situation of the swelling force of the cell cannot be monitored, resulting in performance attenuation of the cell. SUMMARY

[0004] The present application provides a power battery swelling force boundary detection method and a performance attenuation alleviation method and device to detect the swelling force of the cell in real time during actual working conditions of the power battery. The technical solution of the present application is as follows:

[0005] In a first aspect, the present application provides a power battery swelling force boundary detection method, wherein the cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the cell and the constant gap clamp; the method comprises the following steps:

[0006] During a cycle charging and discharging process of the cell, a force bearing area and a swelling force collected by the pressure sensor are acquired according to a preset sampling frequency.

[0007] Based on the acquired force bearing area and swelling force, a target force bearing area and a target swelling force when an inflection point appears are determined, and the target swelling force is taken as a swelling force boundary; wherein the inflection point is an inflection point when the swelling force appears mutation or an inflection point when the cell appears capacity cycle attenuation.

[0008] In a second aspect, the present application provides a power battery performance attenuation alleviation method, wherein the cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the cell and the constant gap clamp; the method comprises the following steps:

[0009] A force bearing area collected by the pressure sensor is acquired in real time.

[0010] An area ratio of the force bearing area to a front surface area of the cell is calculated.

[0011] determining that the area ratio meets a target preset threshold among a plurality of preset thresholds, and obtaining a parameter value of the charging power corresponding to the target preset threshold; wherein the preset threshold is obtained based on an area ratio upper limit of different size batteries under the same chemical system to which the battery cell belongs;

[0012] charging the power battery according to the parameter value of the charging power when the power battery needs to be charged.

[0013] In a third aspect, an embodiment of the present application provides a power battery, wherein a battery cell of the power battery is arranged in a constant gap clamp, first and second thin film pressure sensors are arranged respectively between two sides of the battery cell and the constant gap clamp, and a heat insulation layer is arranged between the battery cell and the first and second thin film pressure sensors.

[0014] In a fourth aspect, an embodiment of the present application provides a power battery swelling force boundary detection device, wherein a battery cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between a side surface of the battery cell and the constant gap clamp; the device comprises:

[0015] a data acquisition module configured to acquire a force bearing area and a swelling force collected by the pressure sensor according to a preset sampling frequency during a cyclic charging and discharging process of the battery cell;

[0016] a boundary determination module configured to determine a target force bearing area and a target swelling force when an inflection point appears based on the acquired force bearing area and swelling force, and take the target swelling force as a swelling force boundary; wherein the inflection point is an inflection point when the swelling force suddenly changes or an inflection point when the battery cell appears capacity cycle attenuation.

[0017] In a fifth aspect, an embodiment of the present application provides a power battery performance attenuation mitigation device, wherein a battery cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between a side surface of the battery cell and the constant gap clamp; the device comprises:

[0018] an area acquisition module configured to acquire a force bearing area collected by the pressure sensor in real time;

[0019] a calculation module configured to calculate an area ratio of the force bearing area of the battery cell to a front area of the battery cell;

[0020] a determination module configured to determine that the area ratio meets a target preset threshold among a plurality of preset thresholds, and obtain a parameter value of the charging power corresponding to the target preset threshold; wherein the preset threshold is obtained based on an area ratio upper limit of different size batteries under the same chemical system to which the battery cell belongs;

[0021] The charging setting module is configured to charge the power battery according to the parameter value of the charging power when the power battery needs to be charged.

[0022] In a sixth aspect, an electronic device is provided, including: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the power battery swelling force boundary detection method in the first aspect or the power battery performance degradation mitigation method in the second aspect.

[0023] In a seventh aspect, a non-transitory computer-readable storage medium storing computer instructions is provided, and the computer instructions are used to cause a computer to perform the power battery swelling force boundary detection method in the first aspect or the power battery performance degradation mitigation method in the second aspect.

[0024] In an eighth aspect, a computer program product is provided, including computer instructions, and the computer instructions are executed by a processor to implement the power battery swelling force boundary detection method in the first aspect or the power battery performance degradation mitigation method in the second aspect.

[0025] The technical solutions provided in the embodiments of the present application at least bring the following beneficial effects:

[0026] The battery swelling force boundary detection method can detect the swelling force of the battery cell in real time during the actual working condition of the power battery, and can obtain the stress area corresponding to the inflection point of the battery cell degradation and the swelling force boundary of the battery cell degradation. The power battery performance degradation mitigation method can detect the swelling force of the battery cell in real time during the actual working condition of the power battery, and set the charging power according to the swelling force boundary, so as to slow down the time of reaching the inflection point of the swelling force and prolong the service life of the power battery.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application, and are not intended to limit the application.

[0029] Figure 1 is a flow chart of a power battery swelling force boundary detection method according to an exemplary embodiment.

[0030] Figure 2 is a flow chart of a method for detecting an expansion force boundary of a power battery according to another example embodiment.

[0031] Figure 3 is a graph of the relationship between expansion force and capacity according to an example embodiment.

[0032] Figure 4 is a flow chart of a method for mitigating performance degradation of a power battery according to an example embodiment.

[0033] Figure 5 is a structural diagram of a cell portion of a power battery according to an example embodiment.

[0034] Figure 6 is a block diagram of a device for detecting an expansion force boundary of a power battery according to an example embodiment.

[0035] Figure 7 is a block diagram of a device for mitigating performance degradation of a power battery according to an example embodiment.

[0036] Figure 8 is a block diagram of an electronic device according to an example embodiment.

[0037] Figure 5 In the above embodiments, the power battery is a lithium ion battery.

[0038] 1-Constant gap clamp, 2-Thin film pressure sensor, 3-Thermal insulation layer. DETAILED DESCRIPTION

[0039] In order to make the ordinary person skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0040] It should be noted that the terms "first", "second", and the like in the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The implementation described in the following example embodiments does not represent all implementations consistent with the present application. Rather, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0041] Figure 1is a flow chart of a power battery swelling force boundary detection method according to an embodiment of the present application. It should be noted that the power battery swelling force boundary detection method of the embodiment of the present application can be applied to the power battery swelling force boundary detection device of the embodiment of the present application. The power battery swelling force boundary detection device can be configured on an electronic device. As shown in Figure 1 , the power battery swelling force boundary detection method can include steps S101-S102.

[0042] In step S101, during the cyclic charging and discharging process of the cell, the stress area and swelling force collected by the pressure sensor are obtained according to a preset sampling frequency.

[0043] It should be noted that the cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the cell and the constant gap clamp.

[0044] It can be understood that only by limiting the cell of the power battery in a constant gap of a certain distance, the swelling force of the cell can be collected. And a large amount of stress area and swelling force data need to be obtained to determine the swelling force boundary point.

[0045] In step S102, based on the obtained stress area and swelling force, the target stress area and target swelling force when the inflection point occurs are determined; and the target swelling force is taken as the swelling force boundary; wherein the inflection point is an inflection point when the swelling force suddenly changes or an inflection point when the capacity of the cell cyclically attenuates.

[0046] The power battery swelling force boundary detection method of the embodiment of the present application can detect the swelling force of the cell in real time during the actual working condition process of the power battery, and obtain the stress area and swelling force boundary of the cell corresponding to the inflection point of the cell attenuation or the inflection point of the swelling force sudden change according to a large amount of collected stress area and swelling force of the cell.

[0047] Figure 2 is a flow chart of a power battery swelling force boundary detection method according to another embodiment of the present application. As shown in Figure 2 , the power battery swelling force boundary detection method includes the following steps:

[0048] In step S201, during the cyclic charging and discharging process of the cell, the stress area and swelling force collected by the pressure sensor are obtained according to a preset sampling frequency.

[0049] It should be noted that the cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the cell and the constant gap clamp. The cell of the power battery is arranged in a constant gap clamp, and a constant gap of a certain distance is formed by the constant gap clamp.

[0050] Optionally, a film pressure sensor is arranged between the side of the battery cell and the constant gap clamp, and the stress area and the expansion force are collected through the film pressure sensor. Other pressure sensors capable of collecting the stress area and the expansion force can also be used, which are not limited herein.

[0051] The pressure sensor of the embodiment of the application can output not only the pressure signal but also the stress area signal. It can be understood that a diagram containing many squares can be pressed by one finger to press only one square on the diagram, and the area of one hand can be pressed if the whole hand is used to press the diagram.

[0052] In the embodiment of the application, the film pressure sensor can be arranged on one side of the battery cell, or the film pressure sensor can be arranged on both sides of the battery cell. When one film pressure sensor or two film pressure sensors are arranged, the width of the constant gap clamp is different.

[0053] When the film pressure sensor is arranged between one side of the battery cell and the constant gap clamp, only the stress area and the expansion force output by the film pressure sensor need to be collected.

[0054] When the first film pressure sensor and the second film pressure sensor are arranged between the two sides of the battery cell and the constant gap clamp respectively, the first stress area and the first expansion force output by the first film pressure sensor and the second stress area and the second expansion force output by the second film pressure sensor need to be collected simultaneously.

[0055] Optionally, a heat insulation layer is arranged between the battery cell and the film pressure sensor. The material of the heat insulation layer can be selected from fiber, aerogel, asbestos, polyethylene, fiber+aerogel, etc. The heat insulation layer can prevent the heat dissipation of the battery cell from affecting the performance and service life of the film pressure sensor, and the heat insulation layer does not affect the output of the film pressure sensor.

[0056] In step S202, based on the collected stress area and expansion force, the target stress area and the target expansion force when the inflection point occurs are determined, wherein the inflection point is the inflection point when the expansion force changes suddenly or the inflection point when the capacity of the battery cell cycles and attenuates.

[0057] It should be noted that the inflection point when the expansion force changes suddenly or the inflection point when the capacity of the battery cell cycles and attenuates is consistent, that is, it occurs at the same time.

[0058] When the first film pressure sensor and the second film pressure sensor are arranged between the two sides of the battery cell and the constant gap clamp respectively, based on the collected first stress area and first expansion force, second stress area and second expansion force between the two sides of the battery cell and the constant gap clamp respectively, the first stress area and the first expansion force, the second stress area and the second expansion force when the inflection point occurs are determined.

[0059] The greater one of the first force area and the second force area at the inflection point is determined as a target force area, and the greater one of the first expansion force and the second expansion force at the inflection point is determined as a target expansion force.

[0060] The capacity of the battery gradually decreases after use, and the internal resistance increases, and the battery attenuation is a gradual process. During this battery attenuation process, the performance test RPT (Reference Performance Test) can be used to collect the changes in the characteristics of the battery during the process. Among them, the RPT test is like a probe, which periodically measures the current actual state of the battery during the running of the battery according to a certain cycle experiment. It should be noted that, as shown in Figure 3 The time point at which the capacity cycle attenuation inflection point of the battery cell occurs is also the time point at which the inflection point of the expansion force of the battery cell occurs.

[0061] When the thin film pressure sensor is arranged between one side of the battery cell and the constant gap clamp, the expansion force of the battery cell at the time point is determined as the expansion force boundary of the battery cell, and the force area at the time point is determined as the target force area.

[0062] It can be understood that the inflection point at which the expansion force of the battery cell occurs is taken as the expansion force boundary, and when the expansion force of the battery cell exceeds the expansion force boundary, it will have an adverse effect on the structure of the battery module.

[0063] When the first thin film pressure sensor and the second thin film pressure sensor are arranged between the two sides of the battery cell and the constant gap clamp respectively, the first force area S1 and the first expansion force F1 output by the first thin film pressure sensor at the time point, and the second force area S2 and the second expansion force F2 output by the second thin film pressure sensor are determined.

[0064] The greater one of the first expansion force F1 and the second expansion force F2 is taken as the expansion force boundary F of the battery cell, and the greater one of the first target force area S1 and the second target force area S2 is taken as the target force area S.

[0065] That is, S is the maximum value of S1 and S2 (S = MAX (S1, S2)), and F is the maximum value of F1 and F2 (F = MAX (F1, F2)).

[0066] The expansion force boundary of the battery cell corresponds to the external performance output of two parameters, which are the inflection point contact area S of the battery cell attenuation and the expansion force boundary F of the battery cell attenuation.

[0067] S203, obtain the area ratio of the target force area to the front area of the battery cell, and take the area ratio as the area ratio upper limit of the different size battery cells belonging to the same chemical system as the battery cell.

[0068] The electric core in the embodiment of the present application is a cuboid structure, and the large face area of the electric core is the front face area S3 of the electric core.

[0069] The area ratio S / S3 can be used to obtain the area ratio corresponding to the inflection point of the expansion force of the battery of different sizes in the system, and the area ratio is the upper limit of the area ratio in the system, which can be defined as L1. The inflection point of the expansion force of the battery in the system can be obtained by S / S3, which is applicable to different sizes of the electric core.

[0070] The method for detecting the expansion force boundary of the power battery in the embodiment of the present application can obtain the contact area corresponding to the inflection point of the attenuation of the electric core and the expansion force boundary of the attenuation of the electric core, and can also obtain the inflection point of the expansion force of the battery of different sizes in the same system and the upper limit of the area ratio.

[0071] After obtaining the expansion force boundary of the power battery in the embodiment of the present application, the following method can be used to slow down the arrival time of the inflection point of the expansion force and prolong the service life of the power battery. Figure 4 is a flowchart of the method for alleviating the performance attenuation of the power battery according to an embodiment of the present application. It should be noted that the method for alleviating the performance attenuation of the power battery in the embodiment of the present application can be applied to the device for alleviating the performance attenuation of the power battery in the embodiment of the present application. The device for alleviating the performance attenuation of the power battery can be configured on an electronic device. As shown in the figure, the method for detecting the expansion force boundary of the power battery can include steps S401-S404. Figure 4

[0072] It should be noted that the electric core of the power battery is arranged in the constant gap clamp, and a pressure sensor is arranged between the side surface of the electric core and the constant gap clamp.

[0073] In step S401, the force area collected by the pressure sensor is obtained in real time.

[0074] A thin film pressure sensor is arranged between the side of the electric core and the constant gap clamp, and the force area of the electric core output by the thin film pressure sensor is obtained in real time.

[0075] When the first thin film pressure sensor and the second thin film pressure sensor are arranged between the two sides of the electric core and the constant gap clamp, the first force area output by the first thin film pressure sensor and the second force area output by the second thin film pressure sensor are obtained in real time, and the larger one of the first force area and the second force area is taken as the force area of the electric core.

[0076] In step S402, the area ratio of the force area of the electric core to the front face area of the electric core is calculated.

[0077] The electric core is a cuboid structure, and the large face area of the electric core is the front face area of the electric core. After obtaining the force area of the electric core, the area ratio S / S3 of the force area S of the electric core to the front face area S3 of the electric core can be calculated.​

[0078] In step S403, it is determined whether the area ratio satisfies a target preset threshold among multiple preset thresholds, and a parameter value of the charging power corresponding to the target preset threshold is obtained; wherein the preset threshold is obtained based on the upper limit of the area ratio of battery cells of different sizes under the same chemical system to which the battery cells belong.

[0079] Optionally, the upper limit of the area ratio of different sized cells in the same chemical system can be obtained by Figure 1 Obtained in the manner shown.

[0080] As an example, the method of the above embodiment is used to obtain the upper limit L1 of the area ratio of different-sized battery cells in the same chemical system:

[0081] When the preset threshold is 50%*L1, that is, when S / S3≤50%*L1, the charging power of the battery needs to be reduced to 80% of the maximum charging power, and the parameter value is 80% of the maximum charging power.

[0082] When the preset threshold is 70%*L1, that is, when S / S3≤70%*L1, the charging power of the battery needs to be reduced to 60% of the maximum charging power, and the parameter value is 60% of the maximum charging power.

[0083] When the preset threshold is 90%*L1, that is, when S / S3≤90%*L1, the charging power of the battery needs to be reduced to 40% of the maximum charging power, and the parameter value is 40% of the maximum charging power.

[0084] It's understandable that the inflection point of the cell's expansion force is considered the expansion force limit. When the cell's expansion force exceeds this limit, it can adversely affect the battery module structure, thereby shortening the battery life. To mitigate the effects of abnormal expansion force on the cell, the battery's charging power is reduced when the area ratio S / S3 reaches a certain level. The greater the cell's expansion force and the larger the area ratio S / S3, the lower the battery's charging power.

[0085] In step S404, the power battery is charged when it needs to be charged according to the parameter value of the charging power.

[0086] When charging the battery, charging the power battery according to the charging power corresponding to the parameter value can slow down the arrival time of the expansion force inflection point and extend the service life of the power battery.

[0087] The power battery performance attenuation mitigation method of the embodiment of the application can detect the expansion force of the battery cell in real time during the actual working condition process of the power battery, can alarm the health degree of the battery pack according to the contact area of the battery cell and the film sensor, can monitor the expansion force of the battery cell in real time, and can slow down the time of reaching the inflection point of the expansion force and prolong the service life of the power battery by controlling the charging power.

[0088] As shown in Figure 5 The example of the application provides a power battery, the battery cell of the power battery is arranged in a constant gap clamp 1, film pressure sensors 2 are arranged between the two sides of the battery cell and the constant gap clamp, and the film pressure sensors are respectively a first film pressure sensor and a second film pressure sensor; a heat insulation layer 3 is arranged between the battery cell and the first film pressure sensor and the second film pressure sensor.

[0089] The material of the heat insulation layer can be selected from fiber, aerogel, asbestos, polyethylene, etc., and is preferably fiber + aerogel, and the width is 0.5-5 mm, which is K2. The heat insulation layer prevents the battery cell from affecting the performance and service life of the film pressure sensor due to heat dissipation.

[0090] The battery cell is placed in the constant gap clamp (the gap is K), the width of the battery cell is K0, and a certain width K1 (0.5-10 mm, preferably 3 mm) is reserved on both sides of the battery cell; the heat insulation layer is placed on both sides of the battery cell.

[0091] The film pressure sensors are placed on both sides of the heat insulation layer (the width of the film pressure sensor is K3, and the width is 0.5-5 mm), wherein K-(K0+2K1+2K2)≤1 mm, and this width setting requirement must be met, otherwise the accuracy of the output of the film pressure sensor may be affected.

[0092] The power battery of the embodiment of the application can detect the expansion force of the battery cell in real time during the actual working condition process of the power battery, can obtain the expansion force boundary of the battery cell according to the real-time obtained expansion force, and can also adjust the charging power of the battery according to the stress area corresponding to the expansion force, slow down the time of reaching the inflection point of the expansion force, and prolong the service life of the power battery.

[0093] Figure 6 is a block diagram of a power battery expansion force boundary detection device according to an example embodiment. Referring to Figure 6 The power battery expansion force boundary detection device can include a data acquisition module 601 and a boundary determination module 602.

[0094] It should be noted that the battery cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the battery cell and the constant gap clamp.

[0095] Specifically, the data acquisition module 601 is configured to acquire the stress area and the expansion force collected by the pressure sensor according to a preset sampling frequency during a cyclic charging and discharging process of the battery cell.

[0096] The boundary determination module 602 is configured to determine a target stress area and a target expansion force when an inflection point occurs based on the acquired stress area and expansion force, and take the target expansion force as an expansion force boundary; wherein the inflection point is an inflection point when the expansion force changes abruptly or an inflection point when the battery cell has a capacity cycle attenuation.

[0097] In some embodiments of the present application, pressure sensors are arranged between two side surfaces of the battery cell and the constant gap clamp, and the data acquisition module 601 is configured to acquire the stress area and the expansion force collected by the pressure sensor according to a preset sampling frequency during a cyclic charging and discharging process of the battery cell.

[0098] In some embodiments of the present application, the data acquisition module 601 is configured to acquire a first stress area and a first expansion force, and a second stress area and a second expansion force collected by the two pressure sensors according to a preset sampling frequency during a cyclic charging and discharging process of the battery cell.

[0099] In some embodiments of the present application, the boundary determination module 602 is further configured to:

[0100] determine a first stress area and a first expansion force, and a second stress area and a second expansion force when an inflection point occurs based on the acquired first stress area and first expansion force, and second stress area and second expansion force;

[0101] determine a larger one of the first stress area and the second stress area when the inflection point occurs as a target stress area, and determine a larger one of the first expansion force and the second expansion force when the inflection point occurs as a target expansion force.

[0102] In some embodiments of the present application, the device further comprises an area ratio upper limit acquisition module 603 configured to:

[0103] acquire an area ratio of the target stress area to a front area of the battery cell, and take the area ratio as an area ratio upper limit of different size battery cells belonging to the same chemical system as the battery cell.

[0104] As to the device in the above-mentioned embodiments, the specific manners in which various modules perform operations have been described in detail in the embodiments of the method, and will not be described in detail here.

[0105] The power battery expansion force boundary detection device provided in the embodiment of the application can detect the expansion force of the battery cell in real time during the actual working condition of the power battery, and can obtain the contact area corresponding to the inflection point of the battery cell attenuation and the expansion force boundary of the battery cell attenuation, and can obtain the expansion force inflection point and the area ratio upper limit of the battery of different sizes in the same system.

[0106] Figure 7 is a block diagram of a power battery performance attenuation mitigation device according to an exemplary embodiment. Referring to Figure 7 The power battery performance attenuation mitigation device can include an area acquisition module 701, a calculation module 702, a determination module 703, and a charging setting module 704.

[0107] It should be noted that the battery cell of the power battery is arranged in a constant gap clamp, and a pressure sensor is arranged between the side surface of the battery cell and the constant gap clamp.

[0108] Specifically, the area acquisition module 701 is configured to acquire the force area collected by the pressure sensor in real time.

[0109] The calculation module 702 is configured to calculate the area ratio of the force area of the battery cell to the front area of the battery cell.

[0110] The determination module 703 is configured to determine that the area ratio satisfies a target preset threshold value among a plurality of preset threshold values, and obtain a parameter value of a charging power corresponding to the target preset threshold value, wherein the preset threshold value is obtained based on the area ratio upper limit of the battery cell of different sizes in the same chemical system.

[0111] The charging setting module 704 is configured to charge the power battery according to the parameter value of the charging power when the power battery needs to be charged.

[0112] As to the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

[0113] The power battery performance attenuation mitigation device provided in the embodiment of the application can detect the expansion force of the battery cell in real time during the actual working condition of the power battery, can alarm the health degree of the battery pack according to the contact area of the battery cell and the thin film sensor, can monitor the expansion force of the battery cell in real time, and can slow down the time of reaching the expansion force inflection point by controlling the charging power, and can prolong the service life of the power battery.

[0114] According to the embodiment of the application, the application further provides an electronic device and a readable storage medium.

[0115] As Figure 8, is a block diagram of an electronic device for implementing a method for detecting the expansion force boundary of a power battery according to an embodiment of the present application. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0116] like Figure 8 As shown, the electronic device includes: one or more processors 801, a memory 802, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In other embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple electronic devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 801 is taken as an example.

[0117] Memory 802 is the non-transitory computer-readable storage medium provided in this application. The memory stores instructions executable by at least one processor, causing the at least one processor to perform the method for detecting the expansion force boundary of a power battery provided in this application. The non-transitory computer-readable storage medium of this application stores computer instructions for causing a computer to perform the method for detecting the expansion force boundary of a power battery provided in this application.

[0118] The memory 802 is a non-transient computer-readable storage medium that can be used to store non-transient software programs, non-transient computer executable programs and modules, such as the program instructions / modules corresponding to the method for detecting the expansion force boundary of a power battery in the embodiment of the present application (for example, the attached Figure 5 The data acquisition module 501 and the boundary determination module 502 shown, or, Figure 6The illustrated area obtaining module 601, calculation module 602, determination module 603 and charging setting module 604). The processor 801 performs various functions of the server by running non-transitory software programs, instructions and modules stored in the memory 802.

[0119] The memory 802 can include a program storage area and a data storage area, where the program storage area can store an operating system, at least one application program required by a function, and the data storage area can store data created according to the use of the power battery expansion force boundary detection electronic device and the like. In addition, the memory 802 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 802 can optionally include a memory disposed remotely with respect to the processor 801, which can be connected to the power battery expansion force boundary detection electronic device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0120] The power battery expansion force boundary detection method electronic device can also include an input device 803 and an output device 804. The processor 801, the memory 802, the input device 803 and the output device 804 can be connected by a bus or other means, Figure 8 For example, by bus connection.

[0121] The input device 803 can receive inputted digital or character information, and generate key signal input related to user settings and function control of the power battery expansion force boundary detection electronic device, such as touch screen, keypad, mouse, trackpad, touchpad, pointing stick, one or more mouse buttons, trackball, joystick, and the like input device. The output device 704 can include a display device, an auxiliary lighting device (such as an LED), and a tactile feedback device (such as a vibration motor), and the like. The display device can include but is not limited to a liquid crystal display (LCD), a light-emitting diode (LED) display, and a plasma display. In some embodiments, the display device can be a touch screen.

[0122] Various implementations of the systems and techniques described here can be realized in digital electronic circuitry, integrated circuitry, specially designed ASICs (application specific integrated circuits), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0123] These computer programs (also known as programs, software, software applications or code) include machine instructions for the programmable processor, and can be implemented in a high-level procedural and / or object-oriented programming language, and / or in assembly / machine language. As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus and / or device (e.g., magnetic discs, optical disks, memory, Programmable Logic Devices (PLDs)) used to provide machine instructions and / or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal used to provide machine instructions and / or data to a programmable processor.

[0124] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0125] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), and the Internet.

[0126] The computer system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.

[0127] In an example embodiment, also provided is a computer program product, which when the instructions in the computer program product are executed by a processor of an electronic device, enables the electronic device to perform the above method.

[0128] It should also be noted that the example embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps are performed simultaneously.

[0129] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application be limited only by the scope of the claims, including any appropriate amendments thereof, and that there be no intention to limit the application to the equivalents of the specifi c embodiments recited herein. The specification and examples given herein are to be considered exemplary of the application, and are presented for the purpose of illustration and description only.

[0130] It is to be understood that the application is not limited to the precise construction described and as shown in the attached figures, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be defined by the claims appended hereto.

Claims

1. A method for alleviating power battery performance degradation, characterized in that: The power battery cell is arranged in a constant gap fixture, and a pressure sensor is arranged between the side of the cell and the constant gap fixture; comprising: Acquiring the force-bearing area collected by the pressure sensor in real time; Calculating an area ratio of the force-bearing area to the front area of ​​the battery cell; Determining whether the area ratio satisfies a target preset threshold among a plurality of preset thresholds, and obtaining a parameter value of a charging power corresponding to the target preset threshold; wherein the preset threshold is obtained based on an upper limit of area ratios of battery cells of different sizes in the same chemical system to which the battery cell belongs; According to the parameter value of the charging power, the power battery is charged when it needs to be charged.

2. A device for alleviating power battery performance degradation, characterized in that: The power battery cell is placed in a constant gap fixture, and a pressure sensor is placed between the side of the cell and the constant gap fixture; the device comprises: An area acquisition module, used to acquire the force-bearing area collected by the pressure sensor in real time; a calculation module, configured to calculate an area ratio of a force-bearing area of ​​the battery cell to a front area of ​​the battery cell; a determination module, configured to determine whether the area ratio satisfies a target preset threshold among a plurality of preset thresholds, and obtain a parameter value of a charging power corresponding to the target preset threshold; wherein the preset threshold is obtained based on an upper limit of area ratios of battery cells of different sizes in the same chemical system to which the battery cell belongs; The charging setting module is used to charge the power battery when it needs to be charged according to the parameter value of the charging power.

3. A power battery, characterized in that: The power battery cell is placed in a constant gap fixture, with a first thin film pressure sensor and a second thin film pressure sensor respectively placed between the two sides of the cell and the constant gap fixture; a heat insulation layer is provided between the cell and the first and second thin film pressure sensors; the power battery is equipped with a device for mitigating power battery performance degradation, the device being configured to obtain the force area collected by the pressure sensor in real time; and calculate the ratio of the force area to the front area of ​​the cell; Determine whether the area ratio satisfies a target preset threshold among multiple preset thresholds, and obtain a parameter value of the charging power corresponding to the target preset threshold; wherein the preset threshold is obtained based on the upper limit of the area ratio of battery cells of different sizes under the same chemical system to which the battery cells belong; and charge the power battery when it needs to be charged according to the parameter value of the charging power.

4. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method for mitigating power battery performance degradation as described in claim 1.

5. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to enable the computer to execute the method for alleviating power battery performance degradation according to claim 1.

Images