Methods for determining the boundary of the thinned area in electrode coating, electronic devices and storage media

Abstract

This invention provides a method for determining the boundary of the coating thinning area of ​​an electrode sheet, an electronic device, and a storage medium. The method obtains at least one contour curve constituting the shape contour of a thinning area from a set of contour curves corresponding to the initial coating thinning area of ​​the target electrode sheet, and uses this as the initial contour curve. Based on the areal density of the material area corresponding to the material area in the target electrode sheet and the initial contour curve, the initial positive and negative electrode capacity ratio corresponding to the target electrode sheet is determined. If the initial positive and negative electrode capacity ratio satisfies a preset positive and negative electrode capacity ratio, the initial contour curve is determined as the boundary of the initial coating thinning area. Since the initial contour curve quantitatively characterizes the contour of the thinning area, and the determination of the coating thinning area boundary is based on the initial contour curve, the accuracy of the coating thinning area boundary design is ensured. Furthermore, the use of the positive and negative electrode capacity ratio for rationality verification improves the rationality of the coating thinning area boundary design, thereby improving the cell's electrical performance and safety performance.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a method for determining the boundary of the thinned area of ​​electrode coating, an electronic device, and a storage medium. Background Technology

[0002] In the production and processing of power batteries, a series of treatments are typically required for the substrate, which usually consists of steps such as coating and drying. Coating is a fundamental process in lithium-ion battery manufacturing, involving the application of a slurry onto a foil to obtain the positive and negative electrodes. However, when using coating to fabricate battery electrodes, the edges need to be thinned to avoid abnormalities. This thinning process is known as the coating thinning zone. If issues such as thick edges or bulging occur during coating due to factors like the surface tension of the slurry, it will directly affect the quality of the dried film and subsequent processing of the substrate. Therefore, ensuring the accuracy of the boundary design of the electrode coating thinning zone to improve the coating quality of the substrate is a pressing technical problem that needs to be solved.

[0003] In related technologies, the boundary setting of most electrode coating thinning areas relies on empirical values, which cannot ensure the accuracy of the electrode coating thinning area boundary. This can easily lead to insufficient or excessive thinning of the electrode coating edge. This approach results in an unreasonable boundary design of the electrode coating thinning area, affecting the electrode edge of the cell to have excessive lithium plating or insufficient lithium insertion, which is not conducive to improving the cell's electrical performance and safety performance. Summary of the Invention

[0004] The embodiments of the present invention provide a method for determining the boundary of the electrode coating thinning area, an electronic device, and a storage medium, which can improve the technical problems of cell electrical performance and safety performance caused by inaccurate design of the electrode coating thinning area boundary in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a method for determining the boundary of an electrode coating thinning region, the method comprising:

[0006] From the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode, at least one contour curve constituting a thinning area morphology contour is obtained as the initial contour curve, and the set of contour curves includes multiple contour curves constituting multiple thinning area morphology contours.

[0007] The initial positive and negative electrode capacity ratio of the target electrode is determined based on the areal density of the material area corresponding to the material area in the target electrode and the initial contour curve.

[0008] If the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio, then the initial contour curve is determined as the boundary of the initial coating thinning area.

[0009] Secondly, embodiments of the present invention provide a boundary determination device for an electrode coating thinning region, the boundary determination device for the electrode coating thinning region comprising:

[0010] The acquisition module is used to acquire at least one contour curve that constitutes a thinning area morphology contour from the contour curve set corresponding to the initial coating thinning area of ​​the target electrode as an initial contour curve. The contour curve set includes multiple contour curves that constitute multiple thinning area morphology contours.

[0011] The first determining module is used to determine the initial positive and negative electrode capacity ratio of the target electrode based on the material area areal density corresponding to the material area in the target electrode and the initial contour curve.

[0012] The second determining module is used to determine the initial contour curve as the boundary of the initial coating thinning area if the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio.

[0013] Thirdly, embodiments of the present invention provide an electronic device, the electronic device comprising:

[0014] One or more processors;

[0015] Memory; and

[0016] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the steps in the method for determining the boundary of the electrode coating thinning zone as described in any of the first aspects.

[0017] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps in the method for determining the boundary of the electrode coating thinning area as described in any one of the first aspects.

[0018] Fifthly, this application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, are used to perform the steps in the method for determining the boundary of the electrode coating thinning area as described in any of the first aspects above.

[0019] The beneficial effects of the embodiments of the present invention are as follows:

[0020] In an embodiment of the present invention, by obtaining the initial profile curve corresponding to the initial coating thinning area of ​​the electrode, the initial positive and negative electrode capacity ratio of the target electrode is determined based on the initial profile curve. When the initial positive and negative electrode capacity ratio meets the conditions, the initial profile curve is used as the boundary of the coating thinning area of ​​the electrode. Since the initial profile curve quantitatively characterizes the profile of the thinning area, and the determination of the boundary of the coating thinning area is based on the initial profile curve, the accuracy of the boundary design of the coating thinning area is ensured. Furthermore, the rationality of the boundary design of the coating thinning area is improved by using the positive and negative electrode capacity ratio for rationality verification, thereby improving the battery cell's electrical performance and safety performance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic flowchart of an embodiment of the method for determining the boundary of the electrode coating thinning area provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the target electrode provided in the embodiments of this application;

[0024] Figure 3 This is a schematic diagram of the contour curve set provided in the embodiments of this application;

[0025] Figure 4 This is a schematic flowchart of another embodiment of the method for determining the boundary of the electrode coating thinning area provided in the embodiments of the present invention;

[0026] Figure 5 This is a schematic flowchart of another embodiment of the method for determining the boundary of the electrode coating thinning area provided in the embodiments of the present invention;

[0027] Figure 6 This is a schematic flowchart of another embodiment of the method for determining the boundary of the electrode coating thinning area provided in the embodiments of the present invention;

[0028] Figure 7 This is a schematic diagram of an embodiment of the electrode coating thinning zone boundary determination device provided in this application;

[0029] Figure 8 This is a schematic diagram of an embodiment of the electronic device provided in this application. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] Currently, most standards for the coating thinning zone of electrode sheets are set based on empirical values ​​combined with actual verification results from cell electrode pad suppliers. Typically, the width and thickness difference between the starting point and the ending point of the coating thinning zone is used as the boundary of the thinning zone. The goal is to ensure that the electrode edge is not thickened (a thick edge can be understood as the electrode edge thickness being greater than the material area) and that there is no powder shedding (smooth edge thinning transition), thus avoiding process abnormalities. This method of determining the boundary of the coating thinning zone results in overly broad design standards and makes it difficult to effectively verify the rationality of the boundary design, leading to frequent instances of insufficient or excessive thinning during production. Therefore, to solve the above problems, this application proposes a method, apparatus, electronic device, and computer-storable medium for determining the boundary of the electrode coating thinning zone.

[0032] like Figure 1 The diagram shown is a flowchart illustrating an embodiment of the method for determining the boundary of the electrode coating thinning area in this application. This method can be executed by a screening and judgment device for defective coating of battery electrodes. The device can be integrated into an electronic device and can be implemented by software and / or hardware. The method for determining the boundary of the electrode coating thinning area includes:

[0033] 101. From the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode, obtain at least one contour curve that constitutes a thinning area morphology contour as an initial contour curve, wherein the set of contour curves includes multiple contour curves that constitute multiple thinning area morphology contours.

[0034] The target electrode can be a lithium-ion battery cell electrode, which consists of a positive electrode and a negative electrode. The target electrode includes a coating thinning area and a material area; that is, both the positive and negative electrode contain corresponding coating thinning and material areas. The coating thinning area refers to the region where the coating process and thinning treatment are performed. In this embodiment, the initial coating thinning area is a thinning area with acceptable electrode edges. This can be determined by detecting the edge of a given initial thinning area, or by obtaining a database of acceptable electrode edges and comparing the data corresponding to the initial thinning area with the database to select acceptable electrode edges as the initial coating thinning area.

[0035] The initial profile curve is the curve corresponding to the profile of the initial coating thinning zone, that is, the boundary of the initial coating thinning zone. For example... Figure 2 The diagram shows a schematic of the target electrode, where A1 represents the material area and A2 represents the morphological contour of the thinning area. The initial contour curve is at least one contour curve constituting a thinning area morphological contour. This contour curve can be one, two, or more, as long as it forms the thinning area morphological contour. For the case of a single contour curve, one contour curve can be pre-selected, and this selected contour curve, along with another contour curve from the set of contour curves, constitutes a thinning area morphological contour. Preferably, in this embodiment, the two contour curves with the largest enclosing area from the multiple contour curves constituting multiple thinning area morphological contours can be selected as the initial contour curves. These two contour curves include an initial upper limit contour curve and an initial lower limit contour curve. The area between the initial upper limit contour curve and the lower limit contour curve is larger than the area between the two contour curves constituting any thinning area morphological contour. This ensures that the boundary of the initially determined coating thinning area is maximized, thereby improving the efficiency of the initial coating thinning area boundary. Figure 3 The diagram shows a set of contour curves, where L1, L2, L3, and L4 are contour curves. Among them, L1 and L4 enclose the largest area. L1 is the initial upper limit contour curve, and L4 is the initial lower limit contour curve.

[0036] Specifically, before step 101, the method further includes: determining the initial coating thinning area of ​​the target electrode; performing scanning tests on the initial coating thinning area and the material area in the target electrode to measure multiple sets of the width of the initial coating thinning area and the thickness of the material area; and performing curve fitting based on the width of the multiple sets of the initial coating thinning area and the thickness of the material area, with the width as the independent variable and the thickness as the dependent variable, to obtain the set of contour curves.

[0037] Specifically, the initial thinning area of ​​the target electrode can be obtained based on manual experience. Then, the edges of the initial thinning area are inspected, and the initial thinning areas with qualified electrode edges are selected as the initial coating thinning areas. Alternatively, the initial coating thinning areas of the target electrode can be stored in the terminal's memory beforehand, allowing direct acquisition of the initial coating thinning areas. Then, using an online inspection device, such as a laser profile tester, the material area and the initial coating thinning area of ​​the target electrode are scanned laterally at a certain speed, with each data point spaced 0.5mm to 1mm apart. The thickness data of the electrode along the width direction is measured, thus obtaining the width of the initial coating thinning area (denoted by b) and the thickness of the material area (denoted by h). Then, curve fitting is performed with the width b as the independent variable and the thickness h as the dependent variable to obtain multiple profile curves y = h(x). At least one profile curve from the set of profile curves that constitutes the morphological profile of a thinning area is selected as the initial profile curve.

[0038] Understandably, in this embodiment, by measuring the continuous width data of the qualified initial coating thinning area at the edge of the electrode and the thickness data of the material area, the contour of the initial coating thinning area is quantitatively characterized. This overcomes the problem of inaccurate contour of the initial coating thinning area caused by relying on empirical values ​​in traditional solutions. At the same time, it realizes the data-driven characterization of the contour of the initial coating thinning area from a theoretical perspective. The initial contour curve is determined by continuous function fitting, which improves the accuracy of the initial contour curve. This allows for subsequent improvement of the accuracy of the boundary of the coating thinning area of ​​the target electrode based on the initial contour curve.

[0039] 102. Determine the initial positive and negative electrode capacity ratio of the target electrode based on the material area areal density corresponding to the material area in the target electrode and the initial profile curve.

[0040] The positive-to-negative capacity ratio (cell balance, CB value), also known as N / P (Negative / Positive), is the ratio of the capacity of the negative electrode active material to the capacity of the positive electrode active material under the same conditions and in the same stage.

[0041] The area within the target electrode that does not contain the initial coating thinning zone is the material region. This material region is divided into the positive electrode material region and the negative electrode material region; that is, the material region within the positive electrode is the positive electrode material region, and the material region within the negative electrode is the negative electrode material region. The areal density, specific capacity of active material, and percentage of active material content for both the positive and negative electrode material regions are predetermined during battery fabrication and are all known quantities.

[0042] In one specific implementation, the initial positive-to-negative electrode capacity ratio, i.e., CB, is calculated using the following formula:

[0043]

[0044] In formula (1), CW 负 The negative electrode surface density, C, is expressed as the negative electrode plate. 负克 Expressed as the specific capacity of the active material in the negative electrode region, Wt 负 Expressed as the percentage of active material content in the negative electrode region, CW 正 The positive electrode surface density, C, is expressed as the positive electrode plate. 正克 Expressed as the specific capacity of the active material in the positive electrode region, Wt 正 It is expressed as the percentage of active material content in the positive electrode area.

[0045] Since the negative electrode surface density of the negative electrode sheet can be calculated from the surface density of the negative electrode material area and the initial contour curve, and the positive electrode surface density of the positive electrode sheet can be calculated from the surface density of the positive electrode material area and the initial contour curve, in this embodiment, the negative electrode surface density and positive electrode surface density can be calculated based on the surface density of the material area and the initial contour curve of the positive electrode material area and the negative electrode material area, and the initial positive and negative electrode capacity ratio corresponding to the target electrode sheet can be determined.

[0046] Specifically, step 102 includes: determining the areal density of the target electrode based on the areal density of the material area corresponding to the material area and the initial contour curve; and determining the initial positive and negative electrode capacity ratio based on the areal density of the target electrode.

[0047] Specifically, the areal density of the target electrode is determined based on the areal density of the material area corresponding to the material area and the initial profile curve. After determining the areal density of the target electrode, the initial positive and negative electrode capacity ratio can be determined based on the areal density of the target electrode.

[0048] Specifically, such as Figure 4 As shown, the target electrode includes a positive electrode and a negative electrode. The material area in the target electrode that does not contain the initial coating thinning area includes the positive material area in the positive electrode and the negative material area in the negative electrode. The material area surface density includes the material area surface density corresponding to the positive electrode and the negative electrode respectively. Step 102 includes 102A-102B.

[0049] 102A. Determine the positive electrode surface density corresponding to the positive electrode sheet based on the surface density of the material area corresponding to the positive electrode material area and the initial contour curve, and determine the negative electrode surface density corresponding to the negative electrode sheet based on the surface density of the material area corresponding to the negative electrode material area and the initial contour curve.

[0050] Among them, the negative electrode surface density is the sum of the surface density of the material area corresponding to the negative electrode material area and the surface density of the negative electrode thinning area, and the positive electrode surface density is the sum of the surface density of the material area corresponding to the negative electrode material area and the surface density of the positive electrode thinning area.

[0051] In one specific implementation, the formulas for calculating the positive electrode areal density and the negative electrode areal density are as follows:

[0052] CW 正 =cw 正料 +cw 正削 (2)

[0053] CW 负 =cw 负料 +cw 负削 (3)

[0054] In formulas (2) and (3), cw 负料 cw represents the surface density of the material area corresponding to the negative electrode material area. 负削 cw represents the areal density corresponding to the negative electrode thinning region. 正料 cw represents the surface density of the material area corresponding to the positive electrode material area. 正削 This represents the areal density corresponding to the thinned region of the positive electrode.

[0055] Since the areal density corresponding to the negative electrode thinning area can be calculated from the initial profile curve and the areal density of the material area corresponding to the negative electrode material area, and the areal density corresponding to the positive electrode thinning area can be calculated from the initial profile curve and the areal density of the material area corresponding to the positive electrode material area, the positive electrode areal density and the negative electrode areal density can be determined based on the areal density of the material area corresponding to the positive electrode material area and the negative electrode material area, as well as the initial profile curve.

[0056] Specifically, such as Figure 5 As shown, the initial coating thinning area includes the positive electrode thinning area corresponding to the positive electrode sheet and the negative electrode thinning area corresponding to the negative electrode sheet; step 102A includes 102A1-102A4.

[0057] 102A1. Based on the surface density of the material area corresponding to the positive electrode material area and the initial contour curve, determine the surface density of the positive electrode thinning area corresponding to the positive electrode thinning area.

[0058] Specifically, the surface density of the material area in the initial coating thinning zone can be calculated using the known surface density of the material area. Based on the proportional relationship between the coating height, coating length, width of the initial coating thinning zone and thickness of the material area, it can be converted into the ratio of the surface area to the cross-sectional area of ​​the initial coating thinning zone.

[0059]

[0060] In formula (4), a represents the length of the target electrode, b represents the width of the initial coating thinning zone, h represents the thickness of the material zone, and CW 削 CW represents the areal density of the initial coated thinned region. 料 The density of the material area is represented by ρ, and the density of the target electrode is represented by s. 削截S represents the cross-sectional area of ​​the initial coated thinned region. 料截 The cross-sectional area of ​​the material zone is represented by s. 削表 Let s represent the surface area of ​​the initially coated thinned region. 削表 =ab,s 料表 denoted as the surface area of ​​the material zone, a represents the length of the target electrode, and b represents the width of the initial coating thinning zone.

[0061] s 削表 Substituting into formula (4) above and performing the transformation, we can see that...

[0062] The initial coating thinning region includes the positive electrode thinning region and the negative electrode thinning region. For the areal density of the positive electrode thinning region, cw in the above formula can be used as an example. 削 Replace with cw 正削 CW .料 Replace with CW .正料 s 削截 Replace with s 正削截 ,For example:

[0063] In the formula, b 正 The width of the positive electrode thinning region, h 正 The thickness of the positive electrode region is represented by cw. 正削 CW represents the areal density of the thinned region of the positive electrode. 正料 The surface density of the positive electrode material region is expressed as s. 正削截 It represents the cross-sectional area of ​​the positive electrode thinning region.

[0064] Since the cross-sectional area of ​​the initial coating thinning region can be calculated based on the initial profile function, the surface density of the positive electrode thinning region can be determined based on the surface density of the material area corresponding to the positive electrode material area and the initial profile curve. Similarly, the surface density of the positive electrode thinning region can be determined based on the surface density of the material area corresponding to the negative electrode material area and the initial profile curve.

[0065] Specifically, the initial profile curve includes the negative electrode profile curve corresponding to the negative electrode thinning area; determining the negative electrode thinning area surface density based on the material area surface density corresponding to the negative electrode material area and the initial profile curve includes: determining the negative electrode cross-sectional area corresponding to the negative electrode thinning area based on the negative electrode profile curve; and determining the negative electrode thinning area surface density based on the negative electrode profile curve, the negative electrode cross-sectional area, and the material area surface density corresponding to the negative electrode material area.

[0066] Specifically, for the surface density of the negative electrode thinning region, it can be... cw in the formula 削 Replace with cw 负削 CW料 Replace with CW 负料 S 削截 Replace with s 负削截 ,For example: In the formula, b 负 The width of the negative electrode thinning region, h 负 The thickness of the negative electrode region is represented by cw. 负削 CW is represented as the areal density of the negative electrode thinning region. 负料 The surface density of the negative electrode material region is expressed as s. 负削截 It is represented as the cross-sectional area of ​​the negative electrode thinning region.

[0067] Specifically, such as Figure 6 As shown, the initial profile curve includes the positive electrode profile curve corresponding to the positive electrode thinning region. Step 102A1 includes 102A11-102A12.

[0068] 102A11. Determine the cross-sectional area of ​​the positive electrode corresponding to the positive electrode thinning region based on the positive electrode profile curve.

[0069] Specifically, step 102A11 includes: performing an integral calculation on the positive electrode profile curve to obtain the positive electrode cross-sectional area.

[0070] Accordingly, the initial profile curve also includes the negative electrode profile curve corresponding to the negative electrode thinning region.

[0071] The initial profile curve h(x) includes the positive electrode profile curve h corresponding to the positive electrode thinning region. 正 (x) and the negative electrode profile curve h corresponding to the negative electrode thinning region. 负 (x).

[0072] Specifically, the cross-sectional area of ​​the initial coated thinning region is the integral of the initial profile curve h(x), i.e. For the positive electrode cross-sectional area, it can be obtained through the formula... Calculated.

[0073] Accordingly, the negative electrode cross-sectional area can be determined using the formula... Calculated.

[0074] 102A12. The surface density of the cathode thinning area is determined based on the cathode profile curve, the cathode cross-sectional area, and the surface density of the material area corresponding to the cathode material area.

[0075] Specifically, step 102A12 includes: obtaining the interval endpoint values ​​corresponding to the independent variable in the positive electrode profile curve; determining the interval endpoint values ​​corresponding to the dependent variable in the positive electrode profile curve based on the interval endpoint values ​​corresponding to the independent variable in the positive electrode profile curve; determining the width of the initial coating thinning area and the thickness of the positive electrode material area based on the interval endpoint values ​​corresponding to the independent variable and the dependent variable in the positive electrode profile curve, thereby obtaining the width value corresponding to the positive electrode coating thinning area and the thickness value corresponding to the positive electrode material area; and determining the surface density of the positive electrode thinning area based on the product of the thickness value corresponding to the positive electrode coating thinning area and the width value corresponding to the positive electrode material area, the surface density of the material area corresponding to the positive electrode material area, and the cross-sectional area of ​​the positive electrode.

[0076] Specifically, based on the endpoint values ​​of the interval corresponding to the independent variable in the positive electrode profile curve, such as [0, b 正 ], b 正 Substituting these values ​​into the positive electrode profile curve, the corresponding dependent variable, such as h, is calculated. 正 Thus, the width b of the positive electrode thinning region is obtained. 正 and the thickness h of the positive electrode material region 正 Substitute the cross-sectional area of ​​the positive electrode into the formula for calculating the surface density of the thinned region of the positive electrode. In the middle, it can be calculated

[0077] Specifically, determining the surface density of the negative electrode thinning area based on the negative electrode profile curve, the negative electrode cross-sectional area, and the surface density of the material area corresponding to the negative electrode material area includes: obtaining the interval endpoint values ​​corresponding to the independent variable in the negative electrode profile curve; determining the interval endpoint values ​​corresponding to the dependent variable in the negative electrode profile curve based on the interval endpoint values ​​corresponding to the independent variable in the negative electrode profile curve; determining the width of the negative electrode thinning area and the thickness of the negative electrode material area based on the interval endpoint values ​​corresponding to the independent variable and the dependent variable in the negative electrode profile curve, thereby obtaining the width value and the thickness value corresponding to the negative electrode coating thinning area; and determining the surface density of the negative electrode thinning area based on the product of the thickness value and the width value of the negative electrode material area, the surface density of the material area corresponding to the negative electrode material area, and the negative electrode cross-sectional area.

[0078] Specifically, based on the endpoint values ​​of the interval corresponding to the independent variable in the negative electrode profile curve, such as [0, b 负 ], b 负 Substituting into the negative electrode profile curve, the corresponding dependent variable, such as h, is calculated. 负 Thus, the width b of the negative electrode thinning region is obtained. 负 and the thickness h of the negative electrode material region 负 Substitute the cross-sectional area of ​​the negative electrode into the formula for calculating the surface density of the thinned region of the negative electrode. In the middle, it can be calculated

[0079] 102A2. Based on the surface density of the material area corresponding to the negative electrode material area and the initial contour curve, determine the surface density of the negative electrode thinning area corresponding to the negative electrode thinning area.

[0080] Specifically, since the calculation methods for the areal density of the negative electrode thinning region and the positive electrode thinning region are the same, the formula for calculating the areal density of the negative electrode thinning region is as follows:

[0081]

[0082] In formula (5), b 负 The width of the negative electrode thinning region, h 负 The thickness of the negative electrode region is represented by cw. 负削 CW is represented as the areal density of the negative electrode thinning region. 负料 The surface density of the material corresponding to the negative electrode material area is expressed as s. 负削截 It is represented as the cross-sectional area of ​​the negative electrode thinning region.

[0083] 102A3. The positive electrode surface density is determined based on the surface density of the thinned positive electrode region and the surface density of the material region corresponding to the positive electrode material region.

[0084] Specifically, the positive electrode surface density is the sum of the surface density of the thinned positive electrode region and the surface density of the corresponding material region in the positive electrode material region, that is:

[0085] 102A4. The surface density of the negative electrode is determined based on the surface density of the thinned negative electrode area and the surface density of the corresponding material area of ​​the negative electrode material area.

[0086] Specifically, similar to step 102A3, the negative electrode surface density is the sum of the surface density of the negative electrode thinning area and the surface density of the corresponding material area of ​​the negative electrode material area, that is:

[0087] 102B. Determine the initial positive-to-negative electrode capacity ratio based on the positive electrode surface density and the negative electrode surface density.

[0088] Specifically, after determining the areal density of the positive electrode and the areal density of the negative electrode, the initial positive-to-negative electrode capacity ratio is determined based on the specific capacity of the active material, the percentage of active material content, the areal density of the positive electrode, and the areal density of the negative electrode in each of the positive and negative electrode regions. The initial positive-to-negative electrode capacity ratio CB can then be calculated using the following formula:

[0089]

[0090] Understandably, in this embodiment, the initial positive and negative electrode capacity ratio can be calculated based on the initial profile curve. Since the initial profile curve is relatively accurate, the initial positive and negative electrode capacity ratio is also more precise, improving the accuracy of the calculation of the initial positive and negative electrode capacity ratio.

[0091] It should be noted that the initial profile curve includes an initial upper limit profile curve h_pos(x) and an initial lower limit profile curve. For the positive electrode profile curve, it includes a positive electrode upper limit profile curve h1_pos(x) and a positive electrode lower limit profile curve h2_pos(x); for the negative electrode profile curve h_neg(x), it includes a negative electrode upper limit profile curve h1_neg(x) and a negative electrode lower limit profile curve h2_neg(x). To ensure the accuracy of the subsequent verification of the initial positive and negative electrode capacity ratio, the maximum value CBmax and the minimum value CBmin of the initial positive and negative electrode capacity ratio can be calculated:

[0092]

[0093]

[0094] 103. If the initial positive and negative electrode capacity ratio meets the preset positive and negative electrode capacity ratio, the initial profile curve is determined as the boundary of the initial coating thinning area.

[0095] Among them, the preset positive and negative electrode capacity ratio is a threshold value of the positive and negative electrode capacity ratio preset for determining whether the initial coating thinning area is accurate. In this embodiment, the preset positive and negative electrode capacity ratio CB0 includes a lower limit value CB0min of the positive and negative electrode capacity ratio and an upper limit value CB0max of the positive and negative electrode capacity ratio.

[0096] Specifically, when the maximum value of the initial positive and negative electrode capacity ratio is less than the upper limit value of the positive and negative electrode capacity ratio, and the minimum value of the initial positive and negative electrode capacity ratio is greater than the lower limit value of the positive and negative electrode capacity ratio, that is, CBmax < CB0max and CBmin > CB0min, it is determined that the initial positive and negative electrode capacity ratio meets the preset positive and negative electrode capacity ratio, indicating that the initial profile curve meets the conditions of the electrode coating process. Therefore, the initial profile curve is determined as the boundary of the initial coating thinning area, realizing the determination of the boundary of the coating thinning area of the target electrode.

[0097] Specifically, the method further includes: if the initial positive and negative electrode capacity ratio does not meet the preset positive and negative electrode capacity ratio, at least one profile curve constituting the morphology profile of the next thinning area is obtained from the set of profile curves corresponding to the initial coating thinning area of the target electrode as the initial profile curve until the boundary of the initial coating thinning area is determined.

[0098] Specifically, if the initial positive and negative electrode capacity ratio does not meet the preset positive and negative electrode capacity ratio, then at least one contour curve constituting the morphological contour of the next thinning area is obtained from the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode as the initial contour curve, and the step of determining the initial positive and negative electrode capacity ratio of the target electrode based on the material area areal density corresponding to the material area in the target electrode and the initial contour curve is executed until the boundary of the initial coating thinning area is obtained.

[0099] More specifically, when the initial positive and negative electrode capacity ratio does not meet the preset positive and negative electrode capacity ratio, it indicates that the initial profile curve does not meet the electrode coating process conditions. In this case, it is necessary to adjust the initial profile curve to obtain at least one profile curve that constitutes the shape profile of a thinning region as the initial profile curve, and continue to determine the corresponding initial positive and negative electrode capacity ratio. When selecting at least one curve with the largest enclosing area as the initial profile curve, the original profile curve set can be narrowed, that is, the initial upper limit profile curve or lower limit profile curve can be deleted. In the remaining profile curve set, the initial profile curve can be determined to obtain the updated initial profile curve. Then, the embodiments of steps 102-103 are repeated until the initial positive and negative electrode capacity ratio corresponding to the updated initial profile curve meets the preset positive and negative electrode capacity ratio. The updated initial profile curve is determined as the boundary of the initial coating thinning region, thereby obtaining the boundary of the initial coating thinning region.

[0100] In one example, the laser profilometer scans at a certain speed, measuring the thickness data of the lateral material area and thinned area of ​​the positive and negative electrode sheets of the battery every 0.5 mm, and fitting the function.

[0101] h(x) = ax⁴ + bx³ + cx² + dx + e. For this battery with tabs on the same side, the upper and lower contour curves of the coating thinning area of ​​the corresponding negative electrode sheet are: h(x) 负1 =-0.0220x 4 +1.2588x 3 -26.8828x 2 +254.2183x-817.4318、h(x) 负2 =-0.0150x 4 +0.8585x 3 -18.3276x 2 +

[0102] 172.4165x-527.1755, the upper and lower limit profile curves of the coating thinning region of the positive electrode are respectively: h(x) 正1 =0.0207x 4 -1.1670x 3 +23.6862x 2-201.1107x+677.0181、h(x) 正2 = -0.0002x 4 +0.0222x 3 -0.9451x 2 +17.1150x-19.3267, the width range of the positive electrode thinning area is 13mm to 19mm, and the width range of the corresponding negative electrode thinning area is 11.5mm to 17.5mm. Other physical quantities are known. The calculated values ​​are CBmin = 1.1434 and CBmax = 1.2492, which meet the CB value control requirements. The coating thinning area production is normal. The upper and lower limit contour curves of the coating thinning area of ​​the negative electrode sheet and the upper and lower limit contour curves of the coating thinning area of ​​the positive electrode sheet can be used as the boundary model of the control standard for the coating thinning area of ​​the positive and negative electrodes of this product model.

[0103] The above-mentioned method for determining the boundary of the electrode coating thinning area obtains the initial contour curve corresponding to the initial coating thinning area of ​​the electrode, determines the initial positive and negative electrode capacity ratio of the target electrode based on the initial contour curve, and uses the initial contour curve as the boundary of the electrode coating thinning area when the initial positive and negative electrode capacity ratio meets the conditions. Since the initial contour curve quantitatively characterizes the contour of the thinning area, and the determination of the boundary of the coating thinning area is based on the initial contour curve, the accuracy of the boundary design of the coating thinning area is ensured. Furthermore, the rationality of the boundary design of the coating thinning area is improved by using the initial positive and negative electrode capacity ratio for verification, thereby improving the battery cell's electrical performance and safety performance.

[0104] like Figure 7 As shown, this application embodiment also provides a boundary determination device 200 for the electrode coating thinning area, the boundary determination device for the electrode coating thinning area includes:

[0105] The acquisition module 201 is used to acquire at least one contour curve that constitutes a thinning area morphology contour from the contour curve set corresponding to the initial coating thinning area of ​​the target electrode as an initial contour curve. The contour curve set includes multiple contour curves that constitute multiple thinning area morphology contours.

[0106] The first determining module 202 is used to determine the initial positive and negative electrode capacity ratio of the target electrode based on the material area areal density corresponding to the material area in the target electrode and the initial contour curve.

[0107] The second determining module 203 is used to determine the initial contour curve as the boundary of the initial coating thinning area if the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio.

[0108] In one embodiment, the device further includes:

[0109] The third determining module is used to, if the initial positive and negative electrode capacity ratio does not meet the preset positive and negative electrode capacity ratio, obtain at least one contour curve from the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode as the initial contour curve, until the boundary of the initial coating thinning area is determined.

[0110] In one embodiment, the device further includes:

[0111] The fourth determining module is used to determine the initial coating thinning area of ​​the target electrode.

[0112] The testing module is used to scan and test the initial coating thinning area and the material area in the target electrode, and measure the width of the initial coating thinning area and the thickness of the material area in multiple sets;

[0113] The fitting module is used to perform curve fitting based on the width of multiple initial coating thinning zones and the thickness of the material zone, with the width as the independent variable and the thickness as the dependent variable, to obtain the set of contour curves.

[0114] In one embodiment, the first determining module 202 is further configured to:

[0115] The surface density of the target electrode is determined based on the surface density of the material area corresponding to the material area and the initial contour curve;

[0116] The initial positive and negative electrode capacity ratio is determined based on the areal density of the target electrode.

[0117] In one embodiment, the target electrode includes a positive electrode and a negative electrode, the material region in the target electrode includes a positive material region in the positive electrode and a negative material region in the negative electrode, and the material region areal density includes the material region areal densities corresponding to the positive electrode and the negative electrode respectively; the first determining module 202 is further configured to:

[0118] The positive electrode surface density corresponding to the positive electrode material area is determined based on the material area surface density corresponding to the positive electrode material area and the initial contour curve, and the negative electrode surface density corresponding to the negative electrode material area is determined based on the material area surface density corresponding to the negative electrode material area and the initial contour curve.

[0119] The initial positive-to-negative electrode capacity ratio is determined based on the positive electrode areal density and the negative electrode areal density.

[0120] In one embodiment, the initial coating thinning area includes a positive electrode thinning area corresponding to the positive electrode sheet and a negative electrode thinning area corresponding to the negative electrode sheet; the first determining module 202 is further configured to:

[0121] Based on the surface density of the material area corresponding to the positive electrode material area and the initial contour curve, the surface density of the positive electrode thinning area corresponding to the positive electrode thinning area is determined.

[0122] Based on the surface density of the negative electrode material area and the initial contour curve, the surface density of the negative electrode thinning area corresponding to the negative electrode thinning area is determined.

[0123] The positive electrode surface density is determined based on the surface density of the thinned positive electrode region and the surface density of the corresponding material region of the positive electrode material region.

[0124] The surface density of the negative electrode is determined based on the surface density of the thinned negative electrode region and the surface density of the corresponding material region of the negative electrode.

[0125] In one embodiment, the initial profile curve includes the positive electrode profile curve corresponding to the positive electrode thinning region; the first determining module 202 is further configured to:

[0126] The cross-sectional area of ​​the positive electrode corresponding to the thinned region is determined based on the positive electrode profile curve.

[0127] The surface density of the cathode thinning area is determined based on the cathode profile curve, the cathode cross-sectional area, and the surface density of the material area corresponding to the cathode material area.

[0128] In one embodiment, the first determining module 202 is further configured to:

[0129] The positive electrode cross-sectional area is obtained by integrating the positive electrode profile curve.

[0130] In one embodiment, the first determining module 202 is further configured to:

[0131] Based on the endpoint values ​​of the independent and dependent variables in the positive electrode profile curve, the width of the positive electrode thinning area and the thickness of the positive electrode material area are determined, and the width value of the positive electrode coating thinning area and the thickness value of the positive electrode material area are obtained.

[0132] The surface density of the thinned area of ​​the positive electrode is determined based on the product of the thickness value and the width value, the surface density of the material area corresponding to the positive electrode material area, and the cross-sectional area of ​​the positive electrode.

[0133] This application embodiment also provides an electronic device that integrates any of the electrode coating thinning area boundary determination devices provided in this application embodiment, the electronic device comprising:

[0134] One or more processors;

[0135] Memory; and

[0136] One or more applications, wherein the one or more applications are stored in the memory and configured by the processor to execute the boundary determination method for the electrode coating thinning area as described in any of the embodiments of the above-described electrode coating thinning area boundary determination method.

[0137] This application also provides an electronic device that integrates any of the electrode coating thinning area boundary determination devices provided in this application. For example... Figure 8 As shown, it illustrates a structural schematic diagram of the electronic device involved in the embodiments of this application, specifically:

[0138] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will understand that... Figure 8 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0139] The processor 301 is the control center of the electronic device. It connects various parts of the electronic device via various interfaces and lines, and performs various functions and processes data by running or executing software programs and / or modules stored in the memory 302, and by calling data stored in the memory 302, thereby providing overall monitoring of the electronic device. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 301.

[0140] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and data processing by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0141] The electronic device also includes a power supply 303 that supplies power to various components. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 303 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0142] The electronic device may also include an input unit 304, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0143] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 301 in the electronic device loads the executable files corresponding to the processes of one or more applications into the memory 302 according to the following instructions, and the processor 301 runs the applications stored in the memory 302 to realize various functions, as follows:

[0144] From the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode, at least one contour curve constituting a thinning area morphology contour is obtained as the initial contour curve, and the set of contour curves includes multiple contour curves constituting multiple thinning area morphology contours.

[0145] The initial positive and negative electrode capacity ratio of the target electrode is determined based on the areal density of the material area corresponding to the material area in the target electrode and the initial contour curve.

[0146] If the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio, then the initial contour curve is determined as the boundary of the initial coating thinning area.

[0147] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0148] Therefore, embodiments of this application provide a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk, etc. A computer program is stored thereon, which is loaded by a processor to execute the steps in any of the electrode coating thinning region boundary determination methods provided in embodiments of this application. For example, the computer program loaded by the processor can execute the following steps:

[0149] From the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode, at least one contour curve constituting a thinning area morphology contour is obtained as the initial contour curve, and the set of contour curves includes multiple contour curves constituting multiple thinning area morphology contours.

[0150] The initial positive and negative electrode capacity ratio of the target electrode is determined based on the areal density of the material area corresponding to the material area in the target electrode and the initial contour curve.

[0151] If the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio, then the initial contour curve is determined as the boundary of the initial coating thinning area.

[0152] This application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, is used to perform the steps in any of the electrode coating thinning area boundary determination methods provided in the application embodiments.

[0153] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0154] In practice, each of the above units or structures can be implemented as an independent entity or can be arbitrarily combined to be implemented as the same or several entities. For the specific implementation of each of the above units or structures, please refer to the previous method embodiments, which will not be repeated here.

[0155] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for determining the boundary of the thinning zone in an electrode coating, characterized in that, The method includes: Determine the initial coating thinning area of ​​the target electrode; Scanning tests were performed on the initial coating thinning area and the material area in the target electrode to measure multiple sets of the width of the initial coating thinning area and the thickness of the material area; Based on the width of the initial coating thinning area and the thickness of the material area in multiple sets, curve fitting is performed with the width as the independent variable and the thickness as the dependent variable to obtain the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode. From the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode, at least one contour curve constituting a thinning area morphology contour is obtained as an initial contour curve, and the set of contour curves includes multiple contour curves constituting multiple thinning area morphology contours. The initial positive and negative electrode capacity ratio of the target electrode is determined based on the areal density of the material area corresponding to the material area in the target electrode and the initial contour curve. If the initial positive and negative electrode capacity ratio satisfies the preset positive and negative electrode capacity ratio, then the initial contour curve is determined as the boundary of the initial coating thinning area.

2. The method for determining the boundary of the electrode coating thinning zone according to claim 1, characterized in that, The method further includes: If the initial positive and negative electrode capacity ratio does not meet the preset positive and negative electrode capacity ratio, then at least one contour curve constituting the shape contour of the next thinning area is obtained from the set of contour curves corresponding to the initial coating thinning area of ​​the target electrode as the initial contour curve, until the boundary of the initial coating thinning area is determined.

3. The method for determining the boundary of the electrode coating thinning zone according to claim 1, characterized in that, The step of determining the initial positive-to-negative electrode capacity ratio corresponding to the target electrode based on the areal density of the material area corresponding to the material area in the target electrode and the initial profile curve includes: The areal density of the target electrode is determined based on the areal density of the material area corresponding to the material area and the initial contour curve; The initial positive and negative electrode capacity ratio is determined based on the areal density of the target electrode.

4. The method for determining the boundary of the electrode coating thinning zone according to claim 3, characterized in that, The target electrode includes a positive electrode and a negative electrode. The material region in the target electrode includes a positive material region in the positive electrode and a negative material region in the negative electrode. The areal density of the material region includes the areal density of the material region corresponding to each of the positive and negative electrode regions. The areal density of the target electrode includes the positive areal density corresponding to the positive electrode and the negative areal density corresponding to the negative electrode. Determining the areal density of the target electrode based on the areal density of the material region and the initial contour curve includes: The positive electrode surface density corresponding to the positive electrode material area is determined based on the material area surface density corresponding to the positive electrode material area and the initial contour curve, and the negative electrode surface density corresponding to the negative electrode material area is determined based on the material area surface density corresponding to the negative electrode material area and the initial contour curve. Determining the initial positive-to-negative electrode capacity ratio based on the areal density of the target electrode includes: The initial positive-to-negative electrode capacity ratio is determined based on the positive electrode areal density and the negative electrode areal density.

5. The method for determining the boundary of the electrode coating thinning zone according to claim 4, characterized in that, The initial coating thinning area includes the positive electrode thinning area corresponding to the positive electrode sheet and the negative electrode thinning area corresponding to the negative electrode sheet; the step of determining the positive electrode surface density corresponding to the positive electrode sheet based on the surface density of the material area corresponding to the positive electrode material area and the initial contour curve, and determining the negative electrode surface density corresponding to the negative electrode sheet based on the surface density of the material area corresponding to the negative electrode material area and the initial contour curve, includes: Based on the surface density of the material area corresponding to the positive electrode material area and the initial contour curve, the surface density of the positive electrode thinning area corresponding to the positive electrode thinning area is determined. Based on the surface density of the material area corresponding to the negative electrode material area and the initial contour curve, the surface density of the negative electrode thinning area corresponding to the negative electrode thinning area is determined. The positive electrode surface density is determined based on the surface density of the thinned positive electrode region and the surface density of the corresponding material region of the positive electrode material region. The surface density of the negative electrode is determined based on the surface density of the thinned negative electrode region and the surface density of the corresponding material region of the negative electrode.

6. The method for determining the boundary of the electrode coating thinning zone according to claim 5, characterized in that, The initial profile curve includes the positive electrode profile curve corresponding to the positive electrode thinning region; determining the surface density of the positive electrode thinning region corresponding to the positive electrode thinning region based on the surface density of the material area corresponding to the positive electrode material area and the initial profile curve includes: The cross-sectional area of ​​the positive electrode corresponding to the thinned region is determined based on the positive electrode profile curve. The surface density of the cathode thinning area is determined based on the cathode profile curve, the cathode cross-sectional area, and the surface density of the material area corresponding to the cathode material area.

7. The method for determining the boundary of the electrode coating thinning zone according to claim 6, characterized in that, Determining the positive electrode cross-sectional area corresponding to the positive electrode thinning region based on the positive electrode profile curve includes: The positive electrode cross-sectional area is obtained by integrating the positive electrode profile curve.

8. The method for determining the boundary of the electrode coating thinning zone according to claim 6, characterized in that, The determination of the surface density of the thinned region of the positive electrode based on the positive electrode profile curve, the positive electrode cross-sectional area, and the surface density of the material area corresponding to the positive electrode material area includes: Obtain the interval endpoint values ​​corresponding to the independent variables in the positive electrode profile curve; The interval endpoint values ​​corresponding to the dependent variable in the positive electrode profile curve are determined based on the interval endpoint values ​​corresponding to the independent variable in the positive electrode profile curve. Based on the interval endpoint values ​​corresponding to the independent and dependent variables in the positive electrode profile curve, the width of the positive electrode thinning area and the thickness of the positive electrode material area are determined, thus obtaining the width value corresponding to the positive electrode coating thinning area and the thickness value corresponding to the positive electrode material area. The surface density of the cathode thinning area is determined based on the product of the thickness value corresponding to the cathode coating thinning area and the width value corresponding to the cathode material area, the surface density of the material area corresponding to the cathode material area, and the cross-sectional area of ​​the cathode.

9. The method for determining the boundary of the electrode coating thinning zone according to claim 5, characterized in that, The initial profile curve includes the negative electrode profile curve corresponding to the negative electrode thinning region; determining the surface density of the negative electrode thinning region corresponding to the negative electrode material region based on the material area surface density corresponding to the negative electrode material region and the initial profile curve includes: The negative electrode cross-sectional area corresponding to the negative electrode thinning region is determined based on the negative electrode profile curve. The surface density of the negative electrode thinning area is determined based on the negative electrode profile curve, the negative electrode cross-sectional area, and the surface density of the material area corresponding to the negative electrode material area.

10. The method for determining the boundary of the electrode coating thinning zone according to claim 9, characterized in that, The determination of the surface density of the thinned area of ​​the negative electrode based on the negative electrode profile curve, the negative electrode cross-sectional area, and the surface density of the material area corresponding to the negative electrode material area includes: Obtain the interval endpoint values ​​corresponding to the independent variables in the negative electrode profile curve; The interval endpoint values ​​corresponding to the dependent variable in the negative electrode profile curve are determined based on the interval endpoint values ​​corresponding to the independent variable in the negative electrode profile curve. Based on the interval endpoint values ​​corresponding to the independent and dependent variables in the negative electrode profile curve, the width of the negative electrode thinning area and the thickness of the negative electrode material area are determined, thus obtaining the width value corresponding to the negative electrode coating thinning area and the thickness value corresponding to the negative electrode material area. The surface density of the negative electrode thinning area is determined based on the product of the thickness value corresponding to the negative electrode coating thinning area and the width value corresponding to the negative electrode material area, the surface density of the material area corresponding to the negative electrode material area, and the cross-sectional area of ​​the negative electrode.

11. An electronic device, characterized in that, The electronic device includes: One or more processors; Memory; and One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the method for determining the boundary of the electrode coating thinning zone as described in any one of claims 1 to 10.

12. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the method for determining the boundary of the electrode coating thinning area as described in any one of claims 1 to 10.

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