A method, device, equipment and medium for non-destructive detection of battery health

Abstract

The present application provides a method, apparatus, device and medium for non-destructive detection of battery health, which relates to the field of battery technology. The method collects charging data of a target battery and calculates a lithium deposition determination value of the target battery based on the collected charging data; compares the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery has lithium deposition; and determines the health of the target battery based on the degree of lithium deposition of the target battery. In some embodiments, the lithium deposition threshold value K0 is obtained by making multiple sample batteries, charging them at different current rates, recording the charging data and plotting a dv / dq graph, and then calculating the lithium deposition determination value K for the target battery. X , through the lithium precipitation determination value K X By comparing it with the lithium plating threshold K0, it is possible to determine whether lithium plating occurs in the target battery and the extent of lithium plating, and thus the health of the batch of batteries can be determined.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a method, apparatus, device, and medium for non-destructive detection of battery health. Background Art

[0002] With technological advancements and rising consumer demands for material well-being, battery safety requirements are becoming increasingly stringent. However, current commercial batteries, when charged at high rates and low temperatures, can experience reduced kinetic performance and increased polarization, leading to lithium deposition, which in turn affects battery safety. Therefore, the extent of lithium deposition is often used to assess battery health throughout its lifecycle. Currently, the most common method involves disassembling the battery to visually determine the presence and extent of lithium deposition. This is time-consuming and can damage the battery during disassembly, posing potential safety risks. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a method, device, electronic device and storage medium for non-destructive detection of battery health, which can analyze whether lithium plating occurs in the battery and the degree of lithium plating through charging data, and then make a judgment on the battery health.

[0004] In a first aspect, an embodiment of the present application provides a method for non-destructive detection of battery health, the method comprising the following steps:

[0005] Collecting charging data of a target battery, and calculating a lithium plating determination value of the target battery based on the collected charging data;

[0006] Comparing the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery has deposited lithium; wherein, if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, it is determined that the target battery has deposited lithium;

[0007] The health of the target battery is determined according to the lithium plating degree of the target battery.

[0008] In some embodiments, the lithium precipitation threshold is determined as follows:

[0009] making a plurality of sample batteries having the same parameters as the target battery;

[0010] Charging each of the sample batteries with a different rate current, and collecting charging data of each of the sample batteries in real time; wherein the charging data includes negative electrode potential data;

[0011] Finding the charging current corresponding to when all the negative electrode potential data reaches zero from the collected charging data of each sample battery, and analyzing the critical lithium deposition current based on the charging current;

[0012] According to the charging data of the sample battery corresponding to the recorded critical lithium deposition current, a dv / dq graph is drawn, and the highest peak in the drawn dv / dq graph is used as the lithium deposition threshold; wherein dv / dq is used to represent the change in negative electrode potential within a constant battery capacity interval.

[0013] In some embodiments, the different rate currents used for charging each sample battery are 0.1C-20C; and the period for real-time collection of charging data of each sample battery is 1s-10s.

[0014] In some embodiments, the charging current corresponding to all the negative electrode potential data reaching zero is summarized and fitted to analyze the critical lithium deposition current.

[0015] In some embodiments, the lithium plating degree of the target battery corresponds to the health of the target battery, wherein, before determining the health of the target battery according to the lithium plating degree of the target battery, the following steps are further included:

[0016] Pre-set lithium plating degree classification strategy.

[0017] In some embodiments, the lithium plating degree classification strategy is pre-set in the following manner:

[0018] Dividing the lithium deposition determination value into several intervals based on the lithium deposition threshold; wherein different intervals represent different lithium deposition degrees;

[0019] The lithium deposition degree of the target battery is determined according to the range in which the lithium deposition determination value of the target battery falls.

[0020] In some embodiments, the lithium deposition threshold is K0, and the lithium deposition determination value is K X , dividing the lithium deposition determination value into a first interval, a second interval, and a third interval based on the lithium deposition threshold;

[0021] The first interval is K0<K X ≤1.2K0, indicating that the degree of lithium precipitation is low;

[0022] The second interval is 1.2K0<K X ≤1.5K0, indicating that the degree of lithium precipitation is medium;

[0023] The third interval is K X >1.5K0, indicating that the degree of lithium deposition is high.

[0024] In a second aspect, an embodiment of the present application provides a device for non-destructively detecting battery health, the device comprising:

[0025] An acquisition module is used to collect charging data of a target battery and calculate a lithium deposition determination value of the target battery based on the collected charging data;

[0026] A determination module, configured to compare the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery has deposited lithium; wherein, if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, it is determined that the target battery has deposited lithium;

[0027] A determination module is used to determine the health of the target battery according to the lithium plating degree of the target battery.

[0028] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the method for non-destructive battery health detection described in any one of the above items are performed.

[0029] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any of the above-mentioned methods for non-destructive battery health detection are executed.

[0030] The present application describes a method, apparatus, device, and medium for non-destructive battery health detection, which collects charging data of a target battery and calculates a lithium deposition determination value for the target battery based on the collected charging data; compares the calculated lithium deposition determination value with a lithium deposition threshold to determine whether the target battery has undergone lithium deposition; and determines the health of the target battery based on the degree of lithium deposition. In some embodiments, the lithium deposition threshold K0 is obtained by making multiple sample batteries, charging them at different current rates, recording the charging data, and plotting a dv / dq graph. The lithium deposition determination value K is then calculated for the charging data of the target battery. X , through the lithium precipitation determination value K X By comparing it with the lithium plating threshold K0, it is possible to determine whether lithium plating occurs in the target battery and the extent of lithium plating, and thus the health of the batch of batteries can be determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A flowchart of the method for non-destructive battery health detection according to an embodiment of the present application is shown;

[0033] Figure 2 A flow chart of determining the lithium deposition threshold value according to an embodiment of the present application is shown;

[0034] Figure 3 shows a dv / dq diagram drawn in an embodiment of the present application;

[0035] Figure 4 The following is a structural block diagram of a device for non-destructive battery health detection according to an embodiment of the present application;

[0036] Figure 5 The figure shows a structural block diagram of the electronic device described in the embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0038] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0039] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0040] When a lithium-ion battery is charging, Li+ is deintercalated from the positive electrode and embedded in the negative electrode; however, when some abnormal conditions occur, such as insufficient lithium embedding space in the negative electrode, too much resistance to Li+ embedding in the negative electrode, too fast deintercalation of Li+ from the positive electrode but inability to embed an equal amount into the negative electrode, etc., the Li+ that cannot be embedded in the negative electrode can only obtain electrons on the surface of the negative electrode, thereby forming a silvery-white metallic lithium element, which is often called lithium plating. Lithium plating not only reduces battery performance and significantly shortens cycle life, but also limits the fast charging capacity of the battery and may cause catastrophic consequences such as combustion and explosion. Therefore, in the prior art, when detecting the health of the battery throughout its life cycle, it is often necessary to visually determine whether the battery has lithium plating by disassembling it, which is time-consuming and labor-intensive. Based on this, the present application provides a method, device, equipment and medium for non-destructive detection of battery health, which is described below through examples.

[0041] Instructions attached Figure 1 A flow chart of a method for non-destructive battery health detection provided by an embodiment of the present application is shown, wherein the method includes steps S1-S3, specifically:

[0042] S1. Collect charging data of a target battery, and calculate a lithium deposition determination value of the target battery based on the collected charging data;

[0043] S2. Compare the calculated lithium deposition determination value with the lithium deposition threshold to determine whether the target battery has deposited lithium; if the calculated lithium deposition determination value is greater than the lithium deposition threshold, determine that the target battery has deposited lithium;

[0044] S3. Determine the health of the target battery according to the lithium plating degree of the target battery.

[0045] This application can analyze whether the battery has lithium plating and the extent of lithium plating through charging data, and then make a judgment on the battery health, which is quick and effective.

[0046] The following describes some embodiments of the present application in detail. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0047] Before executing the above steps S1-S3, the lithium plating threshold of the target battery must be determined. Specifically, when the lithium insertion impedance of the battery's negative electrode increases, the battery's potential will decrease, and lithium plating will occur. The peak value of dv / dq is exactly the change in battery potential, where V is the negative electrode potential of the battery, q is the battery's capacity, and dv / dq is its voltage differential. Therefore, the peak value of dv / dq can be used as a basis for judging battery lithium plating.

[0048] In one embodiment, please refer to the attached specification. Figure 2, this application obtains the lithium plating threshold of the target battery by drawing a dv / dq curve graph, which specifically includes the following steps:

[0049] P1. Prepare multiple sample batteries with the same parameters as the target battery;

[0050] P2. Charging each of the sample batteries with a different rate current and collecting charging data of each of the sample batteries in real time; wherein the charging data includes negative electrode potential data;

[0051] P3. Finding the charging current corresponding to when all the negative electrode potential data reaches zero from the collected charging data of each sample battery, and analyzing the critical lithium deposition current based on the charging current;

[0052] P4. Draw a dv / dq graph based on the recorded charging data of the sample battery corresponding to the critical lithium deposition current, and use the highest peak in the drawn dv / dq graph as the lithium deposition threshold; wherein dv / dq is used to represent the change in negative electrode potential within a constant battery capacity interval.

[0053] In step P1, in order to obtain the lithium plating threshold of the target battery, it is first necessary to produce multiple three-electrode sample batteries with the same design system as the target battery. The same system means that the positive and negative electrode main materials, electrolyte, separator, positive and negative electrode formulas of the battery are all consistent, wherein the positive electrode main material is ternary, lithium iron phosphate, lithium cobalt oxide, etc., and the negative electrode main material is graphite, silicon negative electrode, lithium titanate, etc.; the so-called three electrodes refer to the positive electrode, the negative electrode and the reference electrode, wherein the reference electrode is the electrode used as a reference comparison when measuring the potential of various electrodes. This should be a technical means well known to those skilled in the art and will not be elaborated here.

[0054] In step P2, the different rate currents used for charging each of the sample batteries are 0.1C-20C; the period for real-time collection of charging data of each of the sample batteries is 1s-10s. For example, in one embodiment, 10 three-electrode sample batteries with the same design system as the target battery are prepared, and each of the three-electrode sample batteries is charged with a rate current of 0.1C, 0.5C, 1C, 2C, 4C, 8C, 10C, 12C, 15C, and 20C, respectively. The charging data of each three-electrode sample battery, especially the power and voltage data, is collected, and the sampling period is 5s.

[0055] In step P3, the charging current corresponding to the minimum negative electrode potential reaching zero V is found from the recorded charging data of each three-electrode sample battery. This is because when the current is too small, the minimum negative electrode potential cannot reach zero V; and although multiple charging currents with different rates are selected, it is impossible to make the minimum negative electrode potential of a certain three-electrode sample battery equal to zero V by chance. Therefore, in order to calculate the charging current corresponding to the minimum negative electrode potential of the three-electrode sample battery equal to zero V, it is necessary to summarize and fit the charging currents corresponding to the multiple minimum negative electrode potentials reaching zero V found, and analyze the critical lithium deposition current.

[0056] In step P4, after analyzing the critical lithium deposition current, the charging data of the three-electrode sample battery charged by the critical lithium deposition current is recorded, and a dv / dq graph is drawn. Specifically, the voltage and power data of the nth data point are subtracted from the voltage and power data of the nth data point to obtain a dv and dq data. All data are processed in sequence to obtain a series of dv and dq data. Then we divide dv by dq to obtain another data dv / dq. Then we use dv / dq as the vertical coordinate and capacity as the horizontal coordinate to obtain a standard dv / dq curve graph, which can be seen in the attached figure of the manual. Figure 3 , among which, characteristic peak 1 and characteristic peak 2 mainly reflect the phase change of the positive electrode material, characteristic peak 3 is composed of the phase change reaction of the positive and negative electrodes, characteristic peak 4 mainly reflects the phase change of the negative electrode material, and battery lithium plating occurs at the end of charging, which corresponds to characteristic peak 4 of dv / dq. Therefore, characteristic peak 4 of dv / dq can be used to determine lithium plating, and then the value of characteristic peak 4 is used as the lithium plating threshold K0 of the target battery. It can be seen that K0 is the peak value of the critical point of lithium plating determined by the real potential of the negative electrode. When lithium plating occurs in the battery, the negative electrode potential of the battery will be lower than the potential corresponding to K0. At this time, the potential change of the battery when lithium plating occurs will be greater than the potential change at K0, and the peak value of dv / dq will be greater than K 0时 dv / dq peak value (here refers to 4 peak values).

[0057] In step S1, the target battery is charged by the critical lithium deposition current, and its charging data is collected, and the lithium deposition judgment value K of the target battery is calculated based on the collected charging data. X , where x is the battery capacity retention rate, that is, x = C / C0, C is the discharge capacity corresponding to different cycle numbers, C0 is the nominal capacity of the battery, and the lithium plating judgment value K of the target battery is calculated. X The steps can also be performed by drawing a dv / dq diagram, which will not be described in detail here.

[0058] In step S2, specifically, the calculated lithium deposition judgment value K XCompared with the lithium deposition threshold K0, if K X ≤K0, it is determined that the target battery has no lithium deposition. If K X >K0, it is determined that the target battery is undergoing lithium deposition.

[0059] In step S3, after determining that the target battery has deposited lithium, the extent of its deposited lithium is further determined. When the battery deposits lithium to varying degrees, the rate of change of the battery's potential is different. When the battery deposits lithium severely, the potential change is large, and the 4-peak value of dv / dq is large. Conversely, when the battery deposits lithium severely, the potential change is small, and the 4-peak value of dv / dq is small. Therefore, in this application, K0 / K X The lithium deposition degree is semi-quantitatively judged by the numerical value of the target battery, that is, it is necessary to pre-set a lithium deposition degree classification strategy before determining the health of the target battery according to the lithium deposition degree of the target battery. In one embodiment, the lithium deposition determination value K0 is pre-divided into a first interval, a second interval and a third interval based on the lithium deposition threshold K0, that is, a lithium deposition degree classification strategy is pre-set, and the first interval is K0<K X ≤1.2K0, indicating that the degree of lithium precipitation is low; the second interval is 1.2K0<K X ≤1.5K0, indicating that the degree of lithium precipitation is medium; the third interval is K X >1.5K0, indicating that the degree of lithium deposition is high.

[0060] Since the lithium deposition degree reflects the health of the target battery, the health of the target battery is also divided into several levels, and the health of the target battery corresponds to the lithium deposition degree. For example, in one embodiment, if the calculated lithium deposition judgment value K X If the calculated lithium deposition threshold value K0 is less than or equal to the lithium deposition threshold value K0, and the target battery has not deposited lithium, the health of the target battery is judged to be excellent; if the calculated lithium deposition judgment value K X If the calculated lithium deposition threshold value K0 is greater than or equal to 1.2 times, the target battery lithium deposition degree is low, and the health of the target battery is judged to be good; if the calculated lithium deposition judgment value K X If the value is greater than 1.2 times the lithium deposition threshold K0 and less than or equal to 1.5 times the lithium deposition threshold K0, the target battery has a medium lithium deposition degree, and the health of the target battery is judged to be medium; if the calculated lithium deposition judgment value K X If the lithium plating threshold K0 is greater than 1.5 times, the lithium plating degree of the target battery is high, and the health of the target battery is judged to be poor.

[0061] This application provides a nondestructive battery health testing method that collects and processes charging data to output the required lithium deposition determination value Kx, which can then be used to determine whether lithium deposition has occurred in the battery. Specifically, the presence of lithium deposition in the battery can be determined by comparing the lithium deposition determination value Kx with the lithium deposition threshold K0. The degree of lithium deposition can also be semi-quantitatively determined by the value of K0 / Kx, allowing for quick and effective battery health assessments.

[0062] Based on the same inventive concept, an embodiment of the present application also provides a device for non-destructive detection of battery health. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned method for non-destructive detection of battery health in the embodiment of the present application, the implementation of the device can refer to the implementation of the method for non-destructive detection of battery health, and the repeated parts will not be repeated.

[0063] See the instructions attached Figure 4 In some embodiments, a device for non-destructively detecting battery health comprises:

[0064] An acquisition module 401 is configured to acquire charging data of a target battery and calculate a lithium deposition determination value of the target battery based on the acquired charging data;

[0065] The determination module 402 is configured to compare the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery has deposited lithium; if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, the target battery is determined to have deposited lithium;

[0066] The determination module 403 is configured to determine the health of the target battery according to the lithium plating degree of the target battery.

[0067] In some embodiments, the device further includes an acquisition module for determining a lithium deposition threshold, including:

[0068] making a plurality of sample batteries having the same parameters as the target battery;

[0069] Each sample battery is charged using a different rate current, and charging data of each sample battery is collected in real time; wherein the different rate currents used for charging each sample battery are 0.1C-20C; the period for collecting the charging data of each sample battery in real time is 1s-10s, and the charging data includes negative electrode potential data;

[0070] From the collected charging data of each sample battery, find out the charging current corresponding to when all the negative electrode potential data reaches zero, and analyze the critical lithium deposition current based on the charging current; wherein, the charging current corresponding to when all the found negative electrode potential data reaches zero is summarized and fitted to analyze the critical lithium deposition current;

[0071] According to the charging data of the sample battery corresponding to the recorded critical lithium deposition current, a dv / dq graph is drawn, and the highest peak in the drawn dv / dq graph is used as the lithium deposition threshold; wherein dv / dq is used to represent the change in negative electrode potential within a constant battery capacity interval.

[0072] In some embodiments, the lithium deposition degree of the target battery corresponds to the health of the target battery, and the device further includes a setting module for pre-setting a lithium deposition degree classification strategy before determining the health of the target battery according to the lithium deposition degree of the target battery, including:

[0073] Dividing the lithium deposition determination value into several intervals based on the lithium deposition threshold; wherein different intervals represent different lithium deposition degrees;

[0074] The lithium deposition degree of the target battery is determined according to the range in which the lithium deposition determination value of the target battery falls.

[0075] In some embodiments, the lithium deposition threshold is K0, and the lithium deposition determination value is K X The setting module divides the lithium deposition determination value into a first interval, a second interval and a third interval based on the lithium deposition threshold; wherein the first interval is K0<K X ≤1.2K0, indicating that the degree of lithium precipitation is low; the second interval is 1.2K0<K X ≤1.5K0, indicating that the degree of lithium precipitation is medium; the third interval is K X >1.5K0, indicating that the degree of lithium deposition is high.

[0076] The device for non-destructive detection of battery health described in the present application collects charging data of a target battery through an acquisition module, and calculates a lithium deposition determination value of the target battery based on the collected charging data; compares the calculated lithium deposition determination value with a lithium deposition threshold value through a determination module to determine whether the target battery has undergone lithium deposition; wherein, if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, the target battery is determined to have undergone lithium deposition; and the health of the target battery is determined based on the degree of lithium deposition of the target battery through a determination module. wherein, the lithium deposition threshold value K0 is obtained by making multiple sample batteries, charging them at different current rates, recording the charging data, and drawing a dv / dq graph, and then analyzing the result. The lithium deposition determination value K is obtained by calculating the charging data of the target battery. X , through the lithium precipitation determination value K X By comparing it with the lithium plating threshold K0, it is possible to determine whether lithium plating exists in the target battery and the extent of lithium plating, and then make a health assessment of batch batteries, which is quick and effective.

[0077] Based on the same concept of the present invention, the specification Figure 5 As shown, an embodiment of the present application provides a structure of an electronic device 500, which includes: at least one processor 501, at least one network interface 504 or other user interface 503, a memory 505, and at least one communication bus 502. The communication bus 502 is used to realize the connection and communication between these components. The electronic device 500 optionally includes a user interface 503, including a display (for example, a touch screen, LCD, CRT, holographic imaging (Holographic) or projection (Projector), etc.), a keyboard or a pointing device (for example, a mouse, trackball (trackball), touchpad or touch screen, etc.).

[0078] The memory 505 may include a read-only memory and a random access memory, and provides instructions and data to the processor 501. A portion of the memory 505 may also include a non-volatile random access memory (NVRAM).

[0079] In some embodiments, the memory 505 stores the following elements, protectable modules or data structures, or a subset or extended set thereof:

[0080] Operating system 5051, including various system programs for implementing various basic services and processing hardware-based tasks;

[0081] The application module 5052 includes various application programs, such as a launcher, a media player, a browser, etc., which are used to implement various application services.

[0082] In an embodiment of the present application, by calling the program or instructions stored in the memory 505, the processor 501 is used to execute steps in a method for non-destructive detection of battery health, and can analyze whether lithium plating occurs in the battery and the degree of lithium plating through charging data, and then make a judgment on the battery health, which is quick and effective.

[0083] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps in the method for non-destructive detection of battery health are executed.

[0084] Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, etc. When the computer program on the storage medium is run, the above-mentioned method for non-destructive detection of battery health can be executed.

[0085] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0086] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0087] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0088] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0089] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above embodiments within the technical scope disclosed in the present application, or replace some of the technical features therein with equivalents. However, these modifications, changes, or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for non-destructive testing of battery health, characterized in that: The method comprises the following steps: Collecting charging data of a target battery, and calculating a lithium plating determination value of the target battery based on the collected charging data; Comparing the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery is lithium deposited; wherein, if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, the target battery is determined to be lithium deposited; and determining the lithium deposition threshold value by: making a plurality of sample batteries with the same parameters as the target battery; charging each of the sample batteries with a different rate current, and collecting charging data of each of the sample batteries in real time; wherein, the charging data includes negative electrode potential data; from the collected charging data of each of the sample batteries, finding the charging current corresponding to all the negative electrode potential data reaching zero, and analyzing the critical lithium deposition current based on the charging current; drawing a dv / dq graph based on the recorded charging data of the sample batteries corresponding to the critical lithium deposition current, and taking the highest peak in the drawn dv / dq graph as the lithium deposition threshold; wherein, dv / dq is used to represent the change in negative electrode potential within a constant battery capacity interval; The health of the target battery is determined according to the lithium plating degree of the target battery.

2. The method for non-destructive battery health detection according to claim 1, characterized in that: The different rate currents used for charging each sample battery are 0.1C-20C; The period for real-time collection of charging data of each sample battery is 1s-10s.

3. The method for non-destructive battery health detection according to claim 2, characterized in that: in, The charging current corresponding to all the negative electrode potential data found to reach zero is summarized and fitted to analyze the critical lithium deposition current.

4. The method for non-destructive battery health detection according to claim 3, characterized in that: The lithium deposition degree of the target battery corresponds to the health of the target battery. Before determining the health of the target battery according to the lithium deposition degree of the target battery, the method further includes the following steps: Pre-set lithium plating degree classification strategy.

5. The method for non-destructive battery health detection according to claim 4, characterized in that: The lithium plating degree division strategy is pre-set in the following ways: Dividing the lithium deposition determination value into several intervals based on the lithium deposition threshold; wherein different intervals represent different lithium deposition degrees; The lithium deposition degree of the target battery is determined according to the range in which the lithium deposition determination value of the target battery falls.

6. The method for non-destructive battery health detection according to claim 5, characterized in that: The lithium deposition threshold is K0, the lithium deposition determination value is KX, and the lithium deposition determination value is divided into a first interval, a second interval, and a third interval based on the lithium deposition threshold; The first interval is K0<K X ≤1.2K0, indicating that the degree of lithium precipitation is low; The second interval is 1.2K0<K X ≤1.5K0, indicating that the degree of lithium precipitation is medium; The third interval is K X >1.5K0, indicating that the degree of lithium deposition is high.

7. A device for non-destructive testing of battery health, characterized in that: The device comprises: An acquisition module is used to collect charging data of a target battery and calculate a lithium deposition determination value of the target battery based on the collected charging data; A determination module, configured to compare the calculated lithium deposition determination value with a lithium deposition threshold value to determine whether the target battery is undergoing lithium deposition; wherein, if the calculated lithium deposition determination value is greater than the lithium deposition threshold value, the target battery is determined to be undergoing lithium deposition; and the lithium deposition threshold value is determined by: producing a plurality of sample batteries having the same parameters as the target battery; charging each of the sample batteries with a different rate current, and collecting charging data of each of the sample batteries in real time; wherein, the charging data includes negative electrode potential data; finding the charging current corresponding to the negative electrode potential data reaching zero from the collected charging data of each of the sample batteries, and analyzing the critical lithium deposition current based on the charging current; drawing a dv / dq graph based on the recorded charging data of the sample batteries corresponding to the critical lithium deposition current, and taking the highest peak in the drawn dv / dq graph as the lithium deposition threshold value; wherein, dv / dq is used to represent the change in negative electrode potential within a constant battery capacity interval; A determination module is used to determine the health of the target battery according to the lithium plating degree of the target battery.

8. An electronic device, characterized in that: The electronic device comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor and the memory communicate via the bus. When the machine-readable instructions are executed by the processor, the steps of the method for non-destructive detection of battery health according to any one of claims 1 to 6 are performed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the steps of the method for non-destructive battery health detection according to any one of claims 1 to 6.

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