A method, device, electronic device and storage medium for detecting lithium plating in a battery

Abstract

The present application provides a method, device, electronic device and storage medium for detecting lithium plating of a battery, relating to the technical field of battery detection. Among them, the method for detecting lithium plating of a battery can, without damaging the battery structure, generate a differential curve of the expansion force and capacity by detecting the expansion force and capacity of the battery in real time, and determine whether the battery has lithium plating according to the differential curve of the expansion force and capacity, so as to ensure the safe use of the battery during charging and discharging of the battery.

Description

Technical Field

[0001] This application relates to the technical field of battery detection, and particularly to a method, device, electronic device and storage medium for detecting lithium plating of a battery. Background Art

[0002] Lithium-ion batteries have excellent performance such as high capacity and long life, and are widely used in various fields. The problem of lithium plating in lithium-ion batteries is also a hot issue in the current application and research during the charging process of lithium-ion batteries. Multiple different reasons may cause lithium plating in the battery. After lithium plating in the battery, the separator will be pierced, causing the battery to fail, and in severe cases, there will be a greater potential safety hazard. Therefore, it is crucial to judge whether the battery has lithium plated.

[0003] Currently, there are two common methods for detecting lithium plating in batteries: First, by disassembling the battery, the staff visually observes the surface condition of the negative electrode sheet to judge whether the battery has lithium plated; Second, a third electrode is added to a battery with an existing positive electrode and negative electrode to make a three-electrode battery, and the potential between the third electrode and the negative electrode is used to judge whether the battery has lithium plated.

[0004] However, the first method will damage the structure of the battery, and the implementation process of the second method is relatively complex and inefficient. Therefore, how to provide a method that can detect lithium plating in batteries efficiently without damaging the battery structure is an urgent problem to be solved. Summary of the Invention

[0005] To solve the problems existing in the prior art, embodiments of the present application provide a method, device, electronic device and storage medium for detecting lithium plating of a battery, which can quickly and efficiently detect whether the battery has lithium plated without damaging the battery structure.

[0006] To achieve the above object, the technical solution of the embodiments of the present application is realized as follows:

[0007] In a first aspect, an embodiment of the present application provides a method for detecting lithium plating of a battery, the method including:

[0008] Detecting the expansion force and capacity of the battery;

[0009] Generating a differential curve of the expansion force and capacity according to the expansion force and capacity of the battery;

[0010] Determining whether the battery has lithium plated according to the differential curve.

[0011] In a second aspect, an embodiment of the present application provides a device for detecting lithium plating of a battery, the device including:

[0012] A detection unit, configured to detect the expansion force and capacity of the battery;

[0013] A data processing unit, configured to generate a differential curve of the expansion force and the capacity according to the expansion force and the capacity of the battery; and determine whether the battery is lithium plated according to the differential curve.

[0014] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where a computer program that can run on the processor is stored on the memory. When the computer program is executed by the processor, the processor implements the battery lithium plating detection method in the first aspect described above.

[0015] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the battery lithium plating detection method in the first aspect described above is implemented.

[0016] The battery lithium plating detection method, device, electronic device, and storage medium provided by the embodiments of the present application can automatically calculate whether the battery is lithium plated without damaging the battery structure by analyzing the changes in the differential curves of the battery expansion force and capacity. This method not only does not damage the battery structure, but also has a simpler and more efficient execution process, which can ensure the safe use of the battery and reduce the accident rate to a certain extent. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a flowchart of a battery lithium plating detection method provided by an embodiment of the present application;

[0019] Figure 2 It is a flowchart of another battery lithium plating detection method provided by an embodiment of the present application;

[0020] Figure 3 It is a differential curve of the expansion force and the capacity provided by an embodiment of the present application;

[0021] Figure 4 It is a flowchart of another battery lithium plating detection method provided by an embodiment of the present application;

[0022] Figure 5 It is a structural block diagram of a battery lithium plating detection device provided by an embodiment of the present application;

[0023] Figure 6 It is a structural block diagram of an electronic device provided by an embodiment of the present application. Detailed Implementation Manner

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe this application in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0025] It should be noted that the application scenarios described in the embodiments of this application below are for more clearly explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art can know that with the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0026] In recent years, with the booming development of the new energy industry, lithium-ion batteries have been widely used in various fields due to their excellent performance characteristics such as high capacity and long life. At the same time, the problem of lithium plating in lithium-ion batteries is also a hot issue in the application and research of current lithium-ion batteries during charging. If lithium plating occurs in a lithium-ion battery, the battery will pierce the separator, causing the battery to fail, and in severe cases, it will also pose a greater safety hazard.

[0027] To monitor whether a battery has lithium plating, the embodiments of this application provide a method, device, electronic device, and storage medium for detecting lithium plating in a battery. When the battery is charged and discharged, the expansion force and capacity of the battery are detected. According to the expansion force and capacity of the battery, a differential curve of the expansion force and capacity is generated. Based on the differential curve, it is determined whether the battery has lithium plating, so that during the charging and discharging process of the battery, it can be monitored in real time whether the battery has lithium plating, improving the safety performance of the battery during charging.

[0028] The following further elaborates on this application in detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 The flowchart of a method for detecting lithium plating in a battery provided by the embodiments of this application is shown. This method can be executed by an electronic device. As Figure 1 shown, this method may include the following steps:

[0030] S101, detect the expansion force and capacity of the battery.

[0031] During the process of charging and discharging the battery, the expansion force of the battery can be detected in real time. Exemplarily, the battery can be placed in an expansion force tooling and connected to a charge and discharge machine. A constant clamping force is applied to the battery through the expansion force tooling to obtain the pressure caused by the expansion of the battery, that is, the expansion force of the battery.

[0032] During the charging and discharging process of the battery, the capacity of the battery can be detected in real time.

[0033] In some embodiments, N batteries can be detected. For example, N batteries are placed in an expansion force tooling and connected to a charging and discharging machine, and constant current charging is performed on different batteries at different charging rates, and the expansion force and capacity of each battery are detected in real time. Where N is an integer greater than 1.

[0034] In other embodiments, only one battery can be detected. For example, during the charging and discharging process of battery a, the expansion force and capacity of battery a are detected.

[0035] S102, generate a differential curve of the expansion force and capacity according to the expansion force and capacity of the battery.

[0036] Exemplarily, the expansion force and capacity of the battery detected in real time can be input into curve plotting software to obtain the differential curve generated by the curve plotting software.

[0037] In some embodiments, if only N batteries are detected, the expansion force and capacity of the N batteries detected in real time can be input into curve plotting software to obtain N differential curves generated by the curve plotting software.

[0038] In other embodiments, if only one battery is detected, the expansion force and capacity of the one battery detected in real time can be input into curve plotting software to obtain one differential curve generated by the curve plotting software.

[0039] S103, determine whether the battery is lithium plating according to the differential curve of the expansion force and capacity.

[0040] In some embodiments, it can be determined whether the battery is lithium plating by comparing the differential curves corresponding to different charging rates; if the difference between the peaks of any two differential curves exceeds the set difference threshold, it is determined that the battery is lithium plating at the charging rate corresponding to the K differential curves with the highest peaks; the K is a positive integer less than N.

[0041] In other embodiments, the differential curve can be compared with a pre-stored non-lithium-plating differential curve; if the difference between the differential curve and the non-lithium-plating differential curve exceeds the set difference threshold, it is determined that the battery is lithium plating.

[0042] Using the battery lithium plating detection method provided by the embodiments of the present application, it is possible to more conveniently and efficiently determine whether the battery is lithium plating without damaging the battery structure.

[0043] For easier understanding, the following combines two specific application scenarios to detail the specific execution process of the battery lithium plating detection method provided by the embodiments of the present application.

[0044] Figure 2 The flowchart of another method for detecting lithium plating in a battery provided by an embodiment of the present application is shown. This method for detecting lithium plating in a battery can be applied to analyze the lithium plating situation of a battery before leaving the factory, so as to formulate a battery charging strategy according to the analysis result. As Figure 2 shown, the method may include the following steps:

[0045] S201, after discharging N batteries until they are completely discharged, recharge them to the same state of charge.

[0046] Wherein, N is an integer greater than 1. For example, the value of N can be 4, that is, 4 batteries can be discharged until they are completely discharged and then charged with 10 Ah, so that the 4 batteries are in the same state of charge. The 4 batteries can all be single cells.

[0047] S202, place the N batteries into the expansion force tooling respectively and connect them to the charge and discharge machine.

[0048] Exemplarily, the above-mentioned 4 batteries in the same state of charge can be placed into the expansion force tooling respectively, so that the expansion force tooling applies a set clamping force to the batteries. Among them, the expansion force tooling may include a plurality of battery clamping devices, and each battery clamping device may include a first moving plate and a second moving plate. Each battery can be placed in a battery clamping device. For example, for any one battery, the battery can be placed between the first moving plate and the second moving plate of any one battery clamping device. By adjusting the actuating rod, the first moving plate and the second moving plate can be moved towards the battery to clamp the battery until the force detected by the force sensor reaches the predetermined clamping force.

[0049] After placing the 4 batteries into the expansion force tooling respectively, the 4 batteries can be connected to the charge and discharge machine so that the charge and discharge machine can charge and discharge the 4 batteries.

[0050] S203, charge and discharge the N batteries, and detect the expansion force and capacity of the N batteries.

[0051] In some embodiments, different batteries can be charged at different constant current charging rates until the set full charge voltage is reached. For example, for the above-mentioned 4 batteries, they can be charged to 4.35 V at 2C, 3C, 4C, and 5C respectively. Wherein, C is used to represent the set charging current, 2C means the multiple of the set charging current is 2 times, 3C means the multiple of the set charging current is 3 times, 4C means the multiple of the set charging current is 4 times, and 5C means the multiple of the set charging current is 5 times.

[0052] After the battery reaches the full charge voltage, the battery can be charged at a constant voltage. When charging at a constant voltage, the charging rate can be reduced to 0.05C. After charging at a constant voltage for a period of time, the battery can be discharged to the discharged voltage. For example, the battery can be discharged at 1C until the battery voltage is 2.75V.

[0053] In some other embodiments, other charging methods can also be adopted for the charging process of the battery. For example, the battery can be charged at a constant current according to a set rate first, and after reaching the full charge voltage, the battery can be charged with a stepped current. The embodiments of the present application do not limit the specific charging method.

[0054] During the charging and discharging process of 4 batteries, the capacities of the 4 batteries can be detected in real time.

[0055] During the charging and discharging process of 4 batteries, the swelling forces of the 4 batteries can also be detected synchronously in real time. Specifically, for any one battery, the swelling force of the battery can be detected through the swelling force tooling. During the charging and discharging process of the battery, the force detected by the force sensor is converted into a control signal and sent to the micro-displacement adjustment device. The micro-displacement adjustment device responds to the control signal, controls the actuator rod to move the first moving plate or the second moving plate away from the battery, and keeps the force detected by the force sensor at a predetermined clamping force level. The swelling force of the battery can be determined in real time according to the moving distance of the first moving plate or the second moving plate.

[0056] Exemplarily, for any one battery, during the charging and discharging process of the battery, the swelling force and capacity of the battery can be detected at multiple different times respectively to obtain multiple sets of swelling force and capacity; wherein, each set of swelling force and capacity is the swelling force and capacity of the battery detected at the same time.

[0057] S204, generate differential curves corresponding to different charging rates according to the swelling forces and capacities of N batteries.

[0058] Exemplarily, for each of the 4 batteries, the multiple sets of swelling force and capacity of the battery tested can be input into origin software or other drawing software respectively. The origin software or other drawing software can output the differential curve corresponding to the battery. Obtain the charging rate corresponding to the battery, and use the differential curve corresponding to the battery as the differential curve corresponding to the charging rate. For 4 batteries, 4 differential curves corresponding to different charging rates can be obtained, as Figure 3 shown.

[0059] S205, determine whether the battery is lithium plated according to the differential curve, and formulate a battery charging strategy.

[0060] In some embodiments, differential curves at different charging rates are compared. If the difference between the peaks of at least two differential curves does not exceed a set difference threshold, the differential curve with the lowest peak is saved as the non-lithium-depositing differential curve. For example, Figure 3 Among the 4 differential curves shown, the difference between the peak of the differential curve corresponding to the 2C charging rate and the peak of the differential curve corresponding to the 3C charging rate is small and does not exceed the set difference threshold, and the peak of the differential curve corresponding to the 2C charging rate is the lowest. Then, the differential curve corresponding to the 2C charging rate can be saved as the non-lithium-depositing differential curve.

[0061] Compare the Figure 3 4C charging rate shown with the differential curve corresponding to any one of the 2C or 3C charging rates. When charging to a battery capacity of about 32 Ah, the differential curve corresponding to the 4C charging rate reaches its peak, and compared with the peak of the differential curve corresponding to any one of the 2C or 3C charging rates, the difference is large and exceeds the set difference threshold. Then, it is determined that when charging at the 4C charging rate and the battery capacity reaches about 32 Ah, the battery experiences lithium deposition. Compare the Figure 3 5C charging rate shown with the differential curve corresponding to any one of the 2C or 3C or 4C charging rates. When charging to a battery capacity of about 30 Ah, the differential curve corresponding to the 5C charging rate reaches its peak, and compared with the peak of the differential curve corresponding to any one of the 2C or 3C or 4C charging rates, the difference is large and exceeds the set difference threshold. Then, it is determined that when charging at the 5C charging rate and the battery capacity reaches about 30 Ah, the battery experiences lithium deposition.

[0062] In some other embodiments, differential curves at different charging rates are compared. If the difference between the peaks of any two differential curves exceeds the set difference threshold, it can be determined that lithium deposition occurs in the battery at the charging rates corresponding to the K differential curves with the highest peaks; K is a positive integer less than N. Exemplarily, when N is 4, K can be 2 or 3.

[0063] The above strategy for determining whether the battery experiences lithium deposition and the set difference threshold are determined based on historical experimental measurement results. During the historical experiment, after charging the battery at the 3C charging rate, the battery is disassembled and the negative electrode sheet is observed, and it can be seen that no lithium deposition occurs on the negative electrode sheet of the battery. Through the differential curves obtained in the embodiments of the present application, it can also be determined that when charging the battery at the 3C charging rate, the battery does not experience lithium deposition.

[0064] During historical experiments, the battery was charged at a 4C charging rate. When the battery capacity reached approximately 30 Ah, the battery was disassembled and the negative electrode was observed. It was found that no lithium deposition occurred on the negative electrode of the battery. After the battery capacity reached approximately 32 Ah, the battery was disassembled and the negative electrode was observed. It was found that strip-shaped lithium deposition occurred in the middle of the negative electrode of the battery. Through the differential curve obtained in the embodiments of the present application, it can also be determined that when the battery is charged at a 4C charging rate and the battery capacity reaches approximately 32 Ah, the differential curve reaches its peak and the battery begins to experience lithium deposition.

[0065] During historical experiments, the battery was charged at a 5C charging rate. When the battery capacity reached approximately 28 Ah, the battery was disassembled and the negative electrode was observed. It was found that no lithium deposition occurred on the negative electrode of the battery. After the battery capacity reached approximately 30 Ah, the battery was disassembled and the negative electrode was observed. It was found that lithium deposition occurred on the entire large surface of the negative electrode of the battery. Through the differential curve obtained in the embodiments of the present application, it can also be determined that when the battery is charged at a 5C charging rate and the battery capacity reaches approximately 30 Ah, the differential curve reaches its peak and the battery begins to experience lithium deposition.

[0066] By comparing with the historical experimental results as described above, it can be seen that the lithium deposition detection method for batteries provided in the embodiments of the present application can accurately detect whether lithium deposition occurs in the battery.

[0067] Based on the differential curves corresponding to different charging rates and the lithium deposition analysis results of the battery obtained from the above process, a battery charging strategy can be formulated. Exemplarily, Figure 3 A battery charging strategy formulated according to each of the differential curves shown can be: when the battery starts to be charged from a discharged state, it can be charged at a relatively large charging rate. For example, it can be charged at 5C. When the battery capacity reaches 28 Ah, the charging rate can be reduced to 4C. When the battery capacity reaches 30 Ah, the charging rate can be reduced again to 3C until the battery is fully charged.

[0068] Using the method of the above embodiments, it is possible to nondestructively detect whether a battery has lithium deposition before the battery leaves the factory, so as to formulate a battery charging strategy and facilitate the subsequent use of the battery.

[0069] Figure 4 The flowchart of another battery lithium deposition detection method provided in the embodiments of the present application is shown. This battery lithium deposition detection method can be used by users to detect in real time whether a battery has lithium deposition during the charging process. For example, when charging the battery in a new energy vehicle, it is possible to monitor in real time whether the battery has lithium deposition, so as to protect the health and safety of the battery during the charging of the new energy vehicle. The following takes the detection of whether the battery of a new energy vehicle has lithium deposition as an example for explanation.

[0070] S401. During the charging and discharging process of the battery, the expansion force and capacity of the battery are detected in real time.

[0071] Exemplarily, when a new energy vehicle user charges and discharges the new energy vehicle, the expansion force and capacity of the battery can be detected in real time. For example, the expansion force and capacity of the battery can be detected at multiple different times respectively to obtain multiple sets of expansion force and capacity; among them, each set of expansion force and capacity is the expansion force and capacity of the battery detected at the same time.

[0072] S402. According to the expansion force and capacity of the battery, a differential curve of the expansion force and capacity is generated.

[0073] In some embodiments, according to the multiple sets of expansion force and capacity obtained in step S401, a differential curve of the expansion force and capacity of the new energy vehicle battery during the charging and discharging process can be generated.

[0074] S403. Compare the generated differential curve with a pre-stored non-lithium precipitation differential curve to obtain a comparison result.

[0075] Among them, the non-lithium precipitation differential curve can be generated during the Figure 2 shown detection process. The differential curve of the expansion force and capacity of the new energy vehicle battery detected in real time in step S402 can be compared with the pre-stored non-lithium precipitation differential curve in the new energy vehicle to obtain a comparison result.

[0076] S404. Determine whether the battery is lithium-precipitated according to the comparison result.

[0077] Exemplarily, according to the comparison result obtained in step S403, it can be determined whether the battery of the new energy vehicle is lithium-precipitated. For example, if the difference between the detected real-time differential curve and the pre-stored non-lithium precipitation differential curve exceeds the set difference threshold, it is determined that the new energy vehicle battery is lithium-precipitated; otherwise, the new energy vehicle battery is not lithium-precipitated.

[0078] S405. If it is determined that the battery is lithium-precipitated, an alarm signal is issued and / or the charging power supply is cut off.

[0079] In some embodiments, if it is determined that the new energy vehicle battery is lithium-precipitated, an alarm signal is sent to the user through the audio or video output device of the new energy vehicle; if the new energy vehicle user does not perform processing within the preset time after the alarm signal is sent, the new energy vehicle can also autonomously cut off the charging power supply to form a power-off protection.

[0080] Using the method of the above embodiments, when the user charges and discharges the new energy vehicle, it is possible to detect in real time whether the battery is lithium-precipitated, thereby ensuring the use safety of the new energy vehicle battery during charging and discharging.

[0081] Based on the same inventive concept, an embodiment of the present application further provides a battery lithium plating detection device, as Figure 5 shown. The battery lithium plating detection device includes:

[0082] A detection unit 501 for detecting the expansion force and capacity of the battery;

[0083] A data processing unit 502 for generating a differential curve of the expansion force and capacity according to the expansion force and capacity of the battery; and determining whether the battery has lithium plating according to the differential curve.

[0084] In an optional embodiment, the detection unit 501 may specifically be used for:

[0085] During the charge and discharge process of the battery, the expansion force and capacity of the battery are respectively detected at multiple different times to obtain multiple sets of expansion force and capacity; wherein, each set of expansion force and capacity is the expansion force and capacity of the battery detected at the same time.

[0086] In an optional embodiment, the data processing unit 502 may specifically be used for:

[0087] For the same battery, differentiating the multiple sets of expansion force and capacity, and generating a differential curve corresponding to the same battery according to the differentiation result.

[0088] In an optional embodiment, the detection unit 501 may specifically be used for:

[0089] During the charge and discharge process of N batteries, the expansion force and capacity of the N batteries are respectively detected at multiple different times; the N batteries are in the same state of charge, and are all located in an expansion force tooling and connected to a charge and discharge machine; N is an integer greater than 1.

[0090] In an optional embodiment, the detection unit 501 may specifically be used for:

[0091] Constant current charging different batteries at different charging rates until the full charge voltage is reached;

[0092] Constant voltage charging the N batteries at the full charge voltage; or, performing stepped current charging on the N batteries;

[0093] Discharging to the discharge cut-off voltage;

[0094] The generating a differential curve of the expansion force and capacity according to the expansion force and capacity of the battery includes:

[0095] Respectively generating differential curves corresponding to different charging rates according to the expansion force and capacity of the N batteries, and obtaining N differential curves.

[0096] In an alternative embodiment, the data processing unit 502 may specifically be configured to:

[0097] Compare differential curves corresponding to different charging rates;

[0098] If the difference between the peaks of any two differential curves exceeds a set difference threshold, determine that lithium plating occurs in the battery at the charging rates corresponding to the K differential curves with the highest peaks; K is a positive integer less than N. In an alternative embodiment, the data processing unit 502 may specifically be configured to: The determining whether the battery has lithium plating according to the differential curve includes:

[0099] Compare the differential curve with a pre-stored differential curve without lithium plating;

[0100] If the difference between the differential curve and the differential curve without lithium plating exceeds the set difference threshold, determine that the battery has lithium plating;

[0101] If it is determined that the battery has lithium plating, send an alarm signal and / or cut off the charging power supply.

[0102] Corresponding to the embodiment of the above battery lithium plating detection method, an embodiment of the present application further provides an electronic device. The electronic device may be a terminal device, for example, it may be an electronic device such as a smart phone, a tablet computer, a laptop computer or a PC. The terminal device at least includes a memory for storing data and a processor for data processing. Among them, for the processor for data processing, when performing processing, it may be implemented by a microprocessor, a CPU, a DSP or an FPGA; for the memory, it contains operation instructions, and the operation instructions may be computer-executable code, and each step in the battery lithium plating detection method process of the above embodiment of the present application is implemented through the operation instructions.

[0103] Figure 6 A schematic structural diagram of an electronic device provided by an embodiment of the present application; as Figure 6 As shown, the electronic device 170 in the embodiment of the present application includes: a processor 171, a display 172, a memory 173, and a bus 174. The processor 171, the memory 173, and the display 172 are connected through the bus 174, and the bus 174 is used for transmitting data between the processor 171, the memory 173, and the display 172.

[0104] The memory 173 stores a computer storage medium, and the computer storage medium stores computer-executable instructions for implementing the battery lithium plating detection method described in the embodiment of the present application. The processor 171 is configured to execute the above battery lithium plating detection method and display information on whether the battery has lithium plating on the display 172.

[0105] An embodiment of the present application also provides a computer storage medium, in which computer-executable instructions are stored, and the computer-executable instructions are used to implement the battery lithium plating detection method described in any embodiment of the present application.

[0106] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 one process or multiple processes and / or blocks Figure 1 a device for the functions specified in one block or multiple blocks.

[0108] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements in the process Figure 1 one process or multiple processes and / or blocks Figure 1 the functions specified in one block or multiple blocks.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0110] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

Claims

1. A method for detecting lithium plating in a battery, characterized in that, The method includes: Performing charge and discharge on N batteries, and detecting the swelling force and capacity of the N batteries; Generating differential curves with different charge rates according to the swelling force and capacity of the N batteries; Comparing the differential curves with different charge rates; If the difference between the peaks of any two differential curves exceeds a set difference threshold, determining that lithium plating occurs in the battery at the charge rate corresponding to the K differential curves with the highest peaks, where K is a positive integer less than N; Formulating a battery charging strategy according to the differential curves corresponding to different charge rates and the battery lithium plating result.

2. The method according to claim 1, characterized in that, The detecting the swelling force and capacity of the N batteries includes: During the charge and discharge of the battery, detecting the swelling force and capacity of the battery at multiple different times respectively to obtain multiple sets of swelling force and capacity; wherein, each set of swelling force and capacity is the swelling force and capacity detected for the same battery at the same time.

3. The method according to claim 2, characterized in that, For the same battery, differentiating the multiple sets of swelling force and capacity, and generating a differential curve corresponding to the same battery according to the differentiation result.

4. The method according to claim 2, wherein The during the charge and discharge of the battery, detecting the swelling force and capacity of the battery at multiple different times respectively includes: During the charge and discharge of N batteries, detecting the swelling force and capacity of the N batteries at multiple different times respectively; the N batteries are in the same state of charge, and are all located in a swelling force tooling and connected to a charge and discharge machine; N is an integer greater than 1.

5. The method according to claim 4, characterized in that The process of performing charge and discharge on N batteries includes: Performing constant current charging on different batteries at different charge rates until the full charge voltage is reached; Performing constant voltage charging on the N batteries at the full charge voltage; or performing stepped current charging on the N batteries; Discharging to the discharged voltage; Respectively generating differential curves corresponding to different charge rates according to the swelling force and capacity of the N batteries to obtain N differential curves.

6. A battery lithium plating detection device, characterized in that, It includes: A detection unit for performing charge and discharge on N batteries and detecting the swelling force and capacity of the N batteries; A data processing unit for generating differential curves with different charge rates according to the swelling force and capacity of the N batteries; comparing the differential curves with different charge rates; if the difference between the peaks of any two differential curves exceeds a set difference threshold, determining that lithium plating occurs in the battery at the charge rate corresponding to the K differential curves with the highest peaks, where K is a positive integer less than N; formulating a battery charging strategy according to the differential curves corresponding to different charge rates and the battery lithium plating result.

7. An electronic device, characterized in that, It includes a memory and a processor, and a computer program is stored on the memory and can run on the processor. When the computer program is executed by the processor, the processor implements the method according to any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program therein, characterized in that: When the computer program is executed by the processor, the method according to any one of claims 1 to 5 is implemented.

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