Lithium battery detection method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a lithium battery detection method and device, electronic equipment and a storage medium, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: acquiring at least two to-be-tested batteries, and preprocessing each to-be-tested battery; carrying out charging and discharging treatment on each to-be-detected battery after the pretreatment is completed, and obtaining a positive electrode diffusion coefficient and a negative electrode diffusion coefficient of each to-be-detected battery; obtaining a first difference value between the positive electrode diffusion coefficients of the to-be-detected batteries and a second difference value between the negative electrode diffusion coefficients of the to-be-detected batteries; and obtaining a comparison result of the first difference value and the second difference value, and determining an electrode influencing the consistency of the to-be-tested battery according to the comparison result. According to the scheme provided by the invention, the electrode influencing the consistency of the battery can be determined.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a lithium battery detection method, device, electronic equipment and storage medium. Background Art

[0002] At present, lithium-ion batteries are widely used in the power battery system of electric vehicles due to their high power, high energy density and long cycle life. Lithium-ion batteries commonly used in electric vehicles require multiple small-capacity, low-voltage battery cells to be connected in parallel or in series to form a battery module in order to form a high-voltage, high-capacity battery pack. Therefore, the performance and life of the battery module are limited by the consistency of each individual battery in the battery module. Existing battery consistency detection methods cannot determine which electrode affects the battery consistency. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a lithium battery detection method, device, electronic device and computer-readable storage medium.

[0004] In a first aspect, an embodiment of the present application provides a lithium battery detection method, the method comprising:

[0005] Obtain at least two batteries to be tested, and pre-process each of the batteries to be tested;

[0006] Performing charge and discharge processing on each of the batteries to be tested that has completed the pretreatment, and obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested;

[0007] Obtaining a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested;

[0008] A comparison result of the first difference and the second difference is obtained, and an electrode that affects the consistency of the battery to be tested is determined according to the comparison result.

[0009] In one embodiment, each of the batteries to be tested is controlled to perform cyclic charge and discharge for a preset number of times within a preset voltage range.

[0010] In one embodiment, each of the batteries to be tested is controlled to be charged at a constant current of a first preset rate until the charging time reaches the first preset time, each of the batteries to be tested is left to stand for a second preset time, and if the charging capacity of each of the batteries to be tested is greater than or equal to a charging capacity threshold, each of the batteries to be tested is controlled to enter a discharge state;

[0011] Control each of the batteries to be tested to discharge at a constant current of a second preset rate until the discharge time reaches the first preset time, and let each of the batteries to be tested stand for a second preset time. If the charging capacity of each of the batteries to be tested is greater than or equal to a discharge capacity threshold, control each of the batteries to be tested to stop discharging.

[0012] In one embodiment, if the charging capacity of each of the batteries to be tested is less than the charging capacity threshold, each of the batteries to be tested is controlled to be charged at a constant current of a first preset rate;

[0013] If the charging capacity of each of the batteries to be tested is less than the discharge capacity threshold, each of the batteries to be tested is controlled to discharge at a constant current of a second preset rate.

[0014] In one embodiment, a voltage change curve in a discharge state is obtained, wherein the voltage change curve includes a positive electrode voltage change curve and a negative electrode voltage change curve;

[0015] Obtaining a first change value and a second change value according to the voltage change curve;

[0016] Substituting the first change value and the second change value into a diffusion coefficient calculation formula to obtain the diffusion coefficient, wherein the diffusion coefficient includes a positive electrode diffusion coefficient and a negative electrode diffusion coefficient.

[0017] In one embodiment, the diffusion coefficient calculation formula is as follows:

[0018]

[0019] Where D is the diffusion coefficient, τ is the current pulse duration, Vm is the electrode molar volume, and n m is the number of moles, S is the electrode contact area, ΔE t is the first change value, ΔE s is the second change value.

[0020] In one embodiment, if the first difference is greater than the second difference, it is determined that the positive electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested;

[0021] If the first difference is smaller than the second difference, it is determined that the negative electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested.

[0022] In a second aspect, an embodiment of the present application provides a lithium battery detection device, the lithium battery detection device comprising:

[0023] A preprocessing module, used for obtaining at least two batteries to be tested and performing preprocessing on each of the batteries to be tested;

[0024] A charge and discharge processing module, used to perform charge and discharge processing on each of the batteries to be tested that has completed the preprocessing, and obtain the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested;

[0025] An acquisition module, used to acquire a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested;

[0026] A determination module is used to obtain a comparison result of the first difference and the second difference, and determine an electrode that affects the consistency of the battery to be tested according to the comparison result.

[0027] In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and when the computer program is run by the processor, the lithium battery detection method provided in the first aspect is executed.

[0028] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, which executes the lithium battery detection method provided in the first aspect when running on a processor.

[0029] The lithium battery detection method, device, electronic device and storage medium provided by the present application, wherein the method includes: obtaining at least two batteries to be tested, and pre-processing each of the batteries to be tested; performing charge and discharge processing on each of the batteries to be tested that has completed the pre-processing, and obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested; obtaining the first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and the second difference between the negative electrode diffusion coefficients of each of the batteries to be tested; obtaining the comparison result of the first difference and the second difference, and determining the electrode that affects the consistency of the battery to be tested according to the comparison result. By obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each battery to be tested, and determining the electrode that affects the consistency of the battery to be tested according to the difference between the positive electrode diffusion coefficient and the negative electrode diffusion coefficient, the service life of the battery is further extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution 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 illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0031] Figure 1 A schematic diagram of a process of a lithium battery detection method provided in an embodiment of the present application is shown;

[0032] Figure 2 A schematic diagram of a voltage variation curve provided in an embodiment of the present application is shown;

[0033] Figure 3 A schematic diagram of the structure of a lithium battery detection device provided in an embodiment of the present application is shown;

[0034] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown.

[0035] Icons: 300 - lithium battery detection device, 301 - pre-processing module, 302 - charge and discharge processing module, 303 - acquisition module, 304 - determination module, 400 - electronic device, 401 - transceiver, 402 - processor, 403 - memory. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] The components of the embodiments of the present application generally described and shown in the drawings herein may 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 application claimed for protection, but merely represents the 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 belong to the scope of protection of the present application.

[0038] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0039] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0040] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0041] Currently, in the battery industry, there are usually two methods to test the consistency of a single battery: one is the static test method, which mainly judges the consistency of a single battery based on the capacity, DC internal resistance, AC impedance and voltage difference of a single battery; the other method is the dynamic test method, which evaluates the consistency of a single battery by observing the charging and discharging process.

[0042] However, both of the above-mentioned two detection methods are intended to detect and evaluate the consistency of the entire battery, but cannot correctly distinguish whether the difference in battery consistency comes from the positive electrode or the negative electrode. Therefore, an embodiment of the present application provides a lithium battery detection method that can correctly distinguish the electrodes that affect the battery consistency.

[0043] Example 1

[0044] An embodiment of the present application provides a lithium battery detection method.

[0045] See also Figure 1 , lithium battery testing methods include:

[0046] S101, obtaining at least two batteries to be tested, and performing preprocessing on each of the batteries to be tested.

[0047] It should be noted that before obtaining at least two batteries to be tested, a reference electrode is embedded in each battery to be tested to make a three-electrode battery containing a reference electrode, and the three-electrode battery is used as the battery to be tested.

[0048] In one embodiment, each of the batteries to be tested is controlled to perform cyclic charge and discharge for a preset number of times within a preset voltage range.

[0049] In the embodiment of the present application, the preset voltage interval needs to be any voltage interval within 3V to 4.2V as the voltage interval for cyclic charge and discharge, and each battery to be tested is controlled to be charged at a charge rate of 0.5C and discharged at a discharge rate of 1C, and the cycle test is performed for 50 cycles. When the cycle test number of cycles is completed, it is determined that the battery to be tested has completed the pretreatment. The battery to be tested completes one charge and one discharge to complete one cycle test.

[0050] It should be noted that, any value in the charging rate range of 0.5C-1C can be selected as the charging rate for the cycle test of the battery to be tested, and any value in the discharge rate range of 1C-5C can be selected as the discharge rate for the cycle test of the battery to be tested, wherein the discharge rate must be greater than the charging rate, and any value within 20-100 circles can be selected as the number of cycle test circles.

[0051] In other embodiments, a 0-100% SOC (State of Charge) interval can be set, and the 0-100% SOC interval can be divided into several intervals with an interval of 10%, and 0-100%, 10-100% or 10-90% SOC intervals are obtained respectively, and the battery to be tested is cycled at a temperature of 25°C or 45°C at a 1C discharge rate or a 2C discharge rate to obtain a pre-treated battery.

[0052] S102, performing charge and discharge processing on each of the batteries to be tested that has completed the preprocessing, and obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested.

[0053] In one embodiment, each of the batteries to be tested is controlled to be charged at a constant current of a first preset rate until the charging time reaches the first preset time, each of the batteries to be tested is left to stand for a second preset time, and if the charging capacity of each of the batteries to be tested is greater than or equal to the charging capacity threshold, each of the batteries to be tested is controlled to enter a discharge state; each of the batteries to be tested is controlled to be discharged at a constant current of a second preset rate until the discharge time reaches the first preset time, each of the batteries to be tested is left to stand for a second preset time, and if the charging capacity of each of the batteries to be tested is greater than or equal to the discharge capacity threshold, each of the batteries to be tested is controlled to stop discharging. In the above embodiment, if the charging capacity of each of the batteries to be tested is less than the charging capacity threshold, each of the batteries to be tested is controlled to be charged at a constant current of a first preset rate; if the charging capacity of each of the batteries to be tested is less than the discharge capacity threshold, each of the batteries to be tested is controlled to be discharged at a constant current of a second preset rate.

[0054] In this embodiment, the pre-treated battery is controlled to cycle three times at a charge and discharge rate of 0.1C in the range of 0-100% SOC, and the charge capacity obtained in the last cycle is used as the charge capacity threshold, and the discharge capacity obtained in the last cycle is used as the discharge capacity threshold.

[0055] The battery to be tested is controlled to perform constant current intermittent charge and discharge. For example, the battery to be tested is charged with a constant current of 0.1C for 10 minutes, and then allowed to stand for 10 minutes until the charge capacity is greater than or equal to the charge capacity threshold; then the battery to be tested is discharged with a constant current of 0.1C for 10 minutes, and then allowed to stand for 10 minutes until the discharge capacity is greater than or equal to the discharge capacity threshold, and the discharge is stopped.

[0056] In one embodiment, a voltage change curve in a discharge state is obtained, wherein the voltage change curve includes a positive electrode voltage change curve and a negative electrode voltage change curve; a first change value and a second change value are obtained according to the voltage change curve; the first change value and the second change value are substituted into a diffusion coefficient calculation formula to obtain the diffusion coefficient, wherein the diffusion coefficient includes a positive electrode diffusion coefficient and a negative electrode diffusion coefficient.

[0057] It should be noted that the positive electrode voltage curve and the negative electrode voltage curve of the battery to be tested are obtained during the constant current intermittent discharge process, wherein the positive electrode voltage curve is a voltage difference change curve between the positive electrode voltage and the reference electrode voltage, and the negative electrode voltage curve is a voltage difference change curve between the negative electrode voltage and the reference electrode voltage.

[0058] It is further explained that the positive electrode voltage change curve and the negative electrode voltage change curve are obtained, and the first change value and the second change value are obtained according to the positive electrode voltage change curve; the first change value and the second change value obtained by the positive electrode voltage change curve are substituted into the diffusion coefficient calculation formula to obtain the positive electrode diffusion coefficient; the first change value and the second change value are obtained according to the negative electrode voltage change curve; the first change value and the second change value obtained by the negative electrode voltage change curve are substituted into the diffusion coefficient calculation formula to obtain the negative electrode diffusion coefficient.

[0059] In one embodiment, the diffusion coefficient calculation formula is as follows:

[0060]

[0061] Where D is the diffusion coefficient, τ is the current pulse duration, Vm is the electrode molar volume, n m is the number of moles, S is the electrode contact area, ΔE t is the first change value, ΔE s is the second change value.

[0062] like Figure 2 As shown, Figure 2 It is a voltage change curve, where ΔEs is the steady-state voltage change caused by the charging pulse, and ΔEt is the voltage change during the charging pulse. For example, for a battery system with a slow response, the charging pulse may only last for 1 second, but it may take 5 seconds or even longer to reach a steady state. The calculation of ΔEs is based on the difference between the stable voltage after 5 seconds and the initial voltage, so ΔEt is the voltage change from the 0th second to the 1st second from the start of the pulse.

[0063] Since the current pulse duration, electrode molar volume, molar number and electrode contact area are all constant, the change in diffusion coefficient depends only on the changes in ΔEs and ΔEt.

[0064] Therefore, the embodiment of the present application can directly obtain the diffusion coefficient by obtaining ΔEs and ΔEt through the diffusion coefficient calculation formula, and determine the performance of the battery through the diffusion coefficient. At the same time, for a battery pack composed of multiple batteries, the consistency of the diffusion coefficient can be used as an important indicator for evaluating the consistency of the battery pack. If the diffusion coefficients of the batteries in the battery pack are quite different, then during the charging and discharging process, the transmission speed of ions in the electrodes will be inconsistent, resulting in a decrease in the performance of the battery pack, such as overcharging or over-discharging of some batteries. By obtaining the diffusion coefficients and comparing the differences between them, battery pack consistency problems can be discovered in advance, and measures can be taken to improve the overall quality of the battery pack.

[0065] S103, obtaining a first difference between the positive electrode diffusion coefficients of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of the batteries to be tested.

[0066] S104, obtaining a comparison result of the first difference and the second difference, and determining an electrode that affects the consistency of the battery to be tested according to the comparison result.

[0067] In one embodiment, if the first difference is greater than the second difference, the positive electrode of the battery to be tested is determined to be the electrode that affects the consistency of the battery to be tested; if the first difference is less than the second difference, the negative electrode of the battery to be tested is determined to be the electrode that affects the consistency of the battery to be tested.

[0068] It should be noted that, assuming that the positive electrode diffusion coefficients and negative electrode diffusion coefficients of the three batteries are compared, if the difference between the positive electrode diffusion coefficient of the first battery and the second positive electrode diffusion coefficient is A, the difference between the positive electrode diffusion coefficient of the second battery and the third positive electrode diffusion coefficient is B, the difference between the positive electrode diffusion coefficient of the first battery and the third positive electrode diffusion coefficient is C, the difference between the negative electrode diffusion coefficient of the first battery and the second negative electrode diffusion coefficient is D, the difference between the negative electrode diffusion coefficient of the second battery and the third negative electrode diffusion coefficient is E, and the difference between the negative electrode diffusion coefficient of the first battery and the third negative electrode diffusion coefficient is F, if A is greater than D, B is greater than E, and C is less than F, then it is determined that the positive electrode affects the consistency difference of the batteries to be tested.

[0069] In other embodiments, a plurality of batteries to be tested may be grouped and pre-processed before comparison, and the electrodes that affect the consistency of the batteries to be tested may be determined based on the comparison results.

[0070] The present embodiment provides a lithium battery detection method, wherein the method includes: obtaining at least two batteries to be tested, and pre-processing each of the batteries to be tested; performing charge and discharge processing on each of the batteries to be tested that has completed the pre-processing, and obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested; obtaining a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested; obtaining a comparison result of the first difference and the second difference, and determining the electrode that affects the consistency of the batteries to be tested based on the comparison result. By obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each battery to be tested, and determining the electrode that affects the consistency of the battery to be tested based on the difference between the positive electrode diffusion coefficient and the negative electrode diffusion coefficient, the service life of the battery is further extended.

[0071] Example 2

[0072] In addition, an embodiment of the present application provides a lithium battery detection device.

[0073] like Figure 3 As shown, the lithium battery detection device 300 includes:

[0074] A preprocessing module 301 is used to obtain at least two batteries to be tested and preprocess each of the batteries to be tested;

[0075] A charge and discharge processing module 302 is used to perform charge and discharge processing on each of the batteries to be tested that has completed the preprocessing, and obtain the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested;

[0076] An acquisition module 303 is used to acquire a first difference between the positive electrode diffusion coefficients of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of the batteries to be tested;

[0077] The determination module 304 is used to obtain a comparison result between the first difference and the second difference, and determine the electrode that affects the consistency of the battery to be tested according to the comparison result.

[0078] The lithium battery detection device 300 provided in this embodiment can implement the lithium battery detection method provided in Embodiment 1, and will not be described again here to avoid repetition.

[0079] The lithium battery detection device provided in this embodiment obtains the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each battery to be tested, and determines the electrode that affects the consistency of the battery to be tested according to the difference between the positive electrode diffusion coefficient and the negative electrode diffusion coefficient, thereby further extending the service life of the battery.

[0080] Example 3

[0081] In addition, an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program runs on the processor, the lithium battery detection method provided in Embodiment 1 is executed.

[0082] For details, see Figure 4 The electronic device 400 includes: a transceiver 401, a bus interface and a processor 402, wherein the processor 402 is used to: obtain at least two batteries to be tested and pre-process each of the batteries to be tested; perform charge and discharge processing on each of the batteries to be tested that has completed the pre-processing, and obtain the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested; obtain a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested; obtain a comparison result of the first difference and the second difference, and determine the electrode that affects the consistency of the batteries to be tested according to the comparison result.

[0083] In one embodiment, the processor 402 is further configured to: control each of the batteries to be tested to perform cyclic charge and discharge for a preset number of times within a preset voltage range.

[0084] In one embodiment, the processor 402 is further used to: control each of the batteries to be tested to be charged at a constant current of a first preset rate until the charging time reaches the first preset time, and place each of the batteries to be tested for a second preset time, and if the charging capacity of each of the batteries to be tested is greater than or equal to the charging capacity threshold, control each of the batteries to be tested to enter a discharge state;

[0085] Control each of the batteries to be tested to discharge at a constant current of a second preset rate until the discharge time reaches the first preset time, and let each of the batteries to be tested stand for a second preset time. If the charging capacity of each of the batteries to be tested is greater than or equal to a discharge capacity threshold, control each of the batteries to be tested to stop discharging.

[0086] In one embodiment, the processor 402 is also used for: if the charging capacity of each of the batteries to be tested is less than the charging capacity threshold, then controlling each of the batteries to be tested to be charged at a constant current of a first preset rate; if the charging capacity of each of the batteries to be tested is less than the discharge capacity threshold, then controlling each of the batteries to be tested to be discharged at a constant current of a second preset rate.

[0087] In one embodiment, the processor 402 is also used to: obtain a voltage change curve under a discharge state, wherein the voltage change curve includes a positive electrode voltage change curve and a negative electrode voltage change curve; obtain a first change value and a second change value according to the voltage change curve; substitute the first change value and the second change value into a diffusion coefficient calculation formula to obtain the diffusion coefficient, wherein the diffusion coefficient includes a positive electrode diffusion coefficient and a negative electrode diffusion coefficient.

[0088] In one embodiment, the processor 402 is further configured to: the diffusion coefficient calculation formula is as follows:

[0089]

[0090] Where D is the diffusion coefficient, τ is the current pulse duration, Vm is the electrode molar volume, n m is the number of moles, S is the electrode contact area, ΔE t is the first change value, ΔE s is the second change value.

[0091] In one embodiment, the processor 402 is further used to: if the first difference is greater than the second difference, determine that the positive electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested; if the first difference is less than the second difference, determine that the negative electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested.

[0092] In the embodiment of the present application, the electronic device 400 further includes a memory 403. Figure 4 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 402 and memory represented by memory 403. The bus architecture may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 401 may be a plurality of components, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 402 is responsible for managing the bus architecture and general processing, and the memory 403 may store data used by the processor 402 when performing operations.

[0093] The electronic device 400 provided in the embodiment of the present application can execute the steps of the lithium battery detection method provided in the above method embodiment 1, which will not be described again here to avoid repetition.

[0094] The electronic device provided in this embodiment obtains the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each battery to be tested, and determines the electrode that affects the consistency of the battery to be tested according to the difference between the positive electrode diffusion coefficient and the negative electrode diffusion coefficient, thereby further extending the service life of the battery.

[0095] Example 4

[0096] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the lithium battery detection method provided in Example 1 is implemented.

[0097] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0098] The computer-readable storage medium provided in this embodiment can implement the lithium battery detection method provided in Example 1, and will not be described again here to avoid repetition.

[0099] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or terminal including the element.

[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0101] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A lithium battery detection method, characterized in that: The method comprises: Obtain at least two batteries to be tested, and pre-process each of the batteries to be tested; Performing charge and discharge processing on each of the batteries to be tested that has completed the pretreatment, and obtaining the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested; Obtaining a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested; A comparison result of the first difference and the second difference is obtained, and an electrode that affects the consistency of the battery to be tested is determined according to the comparison result.

2. The lithium battery detection method according to claim 1, characterized in that: The obtaining of at least two batteries to be tested and preprocessing each of the batteries to be tested includes: Each of the batteries to be tested is controlled to perform cyclic charge and discharge for a preset number of times within a preset voltage range.

3. The lithium battery detection method according to claim 1, characterized in that: The charging and discharging process of each of the batteries to be tested that have completed the pre-processing includes: Controlling each of the batteries to be tested to be charged at a constant current of a first preset rate until the charging time reaches the first preset time, leaving each of the batteries to be tested to stand for a second preset time, and if the charging capacity of each of the batteries to be tested is greater than or equal to a charging capacity threshold, controlling each of the batteries to be tested to enter a discharge state; Control each of the batteries to be tested to discharge at a constant current of a second preset rate until the discharge time reaches the first preset time, and let each of the batteries to be tested stand for a second preset time. If the charging capacity of each of the batteries to be tested is greater than or equal to a discharge capacity threshold, control each of the batteries to be tested to stop discharging.

4. The lithium battery detection method according to claim 3, characterized in that: The method further comprises: If the charging capacity of each of the batteries to be tested is less than the charging capacity threshold, controlling each of the batteries to be tested to be charged at a constant current of a first preset rate; If the charging capacity of each of the batteries to be tested is less than the discharge capacity threshold, each of the batteries to be tested is controlled to discharge at a constant current of a second preset rate.

5. The lithium battery detection method according to claim 3, characterized in that: The obtaining of the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested comprises: Acquire a voltage variation curve in a discharge state, wherein the voltage variation curve includes a positive electrode voltage variation curve and a negative electrode voltage variation curve; Obtaining a first change value and a second change value according to the voltage change curve; Substituting the first change value and the second change value into a diffusion coefficient calculation formula to obtain the diffusion coefficient, wherein the diffusion coefficient includes a positive electrode diffusion coefficient and a negative electrode diffusion coefficient.

6. The lithium battery detection method according to claim 5, characterized in that: The diffusion coefficient calculation formula is as follows: Where D is the diffusion coefficient, τ is the current pulse duration, Vm is the electrode molar volume, n m is the number of moles, S is the electrode contact area, ΔE t is the first change value, ΔE s is the second change value.

7. The lithium battery detection method according to claim 1, characterized in that: The obtaining a comparison result of the first difference and the second difference, and determining an electrode that affects the consistency of the battery to be tested according to the comparison result, includes: If the first difference is greater than the second difference, determining that the positive electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested; If the first difference is smaller than the second difference, it is determined that the negative electrode of the battery to be tested is the electrode that affects the consistency of the battery to be tested.

8. A lithium battery detection device, characterized in that: The device comprises: A preprocessing module, used for obtaining at least two batteries to be tested and performing preprocessing on each of the batteries to be tested; A charge and discharge processing module, used to perform charge and discharge processing on each of the batteries to be tested that has completed the preprocessing, and obtain the positive electrode diffusion coefficient and the negative electrode diffusion coefficient of each of the batteries to be tested; An acquisition module, used to acquire a first difference between the positive electrode diffusion coefficients of each of the batteries to be tested and a second difference between the negative electrode diffusion coefficients of each of the batteries to be tested; A determination module is used to obtain a comparison result of the first difference and the second difference, and determine an electrode that affects the consistency of the battery to be tested according to the comparison result.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a computer program, and the computer program executes the lithium battery detection method according to any one of claims 1 to 7 when the processor is running.

10. A computer-readable storage medium, characterized in that: The computer program stores a computer program, and when the computer program is run on a processor, the lithium battery detection method according to any one of claims 1 to 7 is executed.

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