Method for calculating laser die cutting distance, laser die cutting method, pole piece, and roll core

Abstract

The application provides a laser die-cutting distance calculation method, a laser die-cutting method, a pole piece and a roll core. The calculation method comprises determining the width J of a preset tab on a to-be-die-cut pole piece n ; obtaining the thickness W1 of a to-be-wound positive pole piece, the thickness W2 of a negative pole piece, the thickness W3 of a diaphragm and the circumference C of a winding needle; based on the geometric center line alignment principle of multiple tabs of the same polarity on the roll core in the width direction after the to-be-die-cut pole piece is wound, when the to-be-die-cut pole piece is a positive pole piece, D 1正 =(C / π+4*W3+2*W2)×π‑J 1正 ; when the to-be-die-cut pole piece is a negative pole piece, D 1负 =(C / π+2*W3)×π‑J 1负 ; D n‑1 =[(D n‑2 +J n‑2 ) / π+4×W3+2×(W1+W2)]×π‑J n‑1 , and the laser die-cutting distance D n‑1 is calculated layer by layer. The application solves the problem that the die-cutting distance of the pole piece in the prior art is difficult to confirm.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a laser die cutting distance calculation method, a laser die cutting method, a pole piece and a roll core. BACKGROUND

[0002] The battery is a core component of a new energy vehicle, and its safety, reliability and economy directly affect the performance and use experience of the new energy vehicle. Among them, the tab is a window for the internal material of the battery to contact the outside world, and its quality is directly related to the electrical performance and safety performance of the battery.

[0003] For the initial production of a new product, it is of great significance to quickly determine the die cutting size of the tab, save manpower and resources, and improve production efficiency. The traditional confirmation method mainly involves multiple cutting, manual measurement of the die cutting size to be adjusted according to the tab state of the roll core, and repeated confirmation, which is time-consuming and laborious and causes great material waste.

[0004] In order to optimize the die cutting size confirmation of the pole piece, a tab edge positioning algorithm based on deep learning is proposed, which extracts features of a tab image through a convolutional neural network to realize tab edge positioning. However, this algorithm only solves the problem of tab edge positioning, and the control effect of key factors such as tab die cutting distance is not good, which cannot effectively improve the tab cutting quality of the lithium battery. SUMMARY

[0005] The main purpose of the present application is to provide a laser die cutting distance calculation method, a laser die cutting method, a pole piece and a roll core to solve the problem of rapid confirmation of the die cutting size of the pole piece in the prior art.

[0006] In order to achieve the above purpose, according to one aspect of the present application, a laser die cutting distance calculation method is provided, which comprises determining the width J n of a preset tab on a to-be-die-cut pole piece, n≥2, and n is a positive integer; wherein J1, J2, J3, …, J n-1 , J n are the widths of the first tab, the second tab, the third tab, …, the (n-1)th tab and the nth tab arranged in the roll core formed after the to-be-die-cut pole piece is wound in turn from the innermost circle to the outermost circle direction in turn; obtaining the thickness W1 of the positive pole piece, the thickness W2 of the negative pole piece, the thickness W3 of the diaphragm and the circumference C of the winding needle; after the to-be-die-cut pole piece is wound to form a roll core, based on the geometric center line alignment principle of the tabs of the same polarity on the roll core in the width direction, the laser die cutting distances D1, D2, …, D n-2 , D n-1 , D1 is the laser die cutting distance between the first tab and the second tab; D n-1is the laser die-cutting distance between the (n-1)th tab and the nth tab; wherein the calculation of D1 is: when the to-be-die-cut tab is a positive tab, then D 1正 = (C / π + 4×W3 + 2×W2)×π-J 1正 ; when the to-be-die-cut tab is a negative tab, then D 1负 = (C / π + 2×W3)×π-J 1负 ; the calculation of D n-1 is: D n-1 = [(D n-2 + J n-2 ) / π + 4×W3 + 2×(W1+W2)]×π-J n-1 ; wherein, when D n-1 is calculated, n≥3, and n is a positive integer.

[0007] Further, when the widths J1, J2, J3, …, J n-1 , J n of the tabs are all equal, the values of the laser die-cutting distances D1, D2, …, D n-2 , D n-1 are gradually increased.

[0008] Further, when the widths J1, J2, J3, …, J n-1 , J n of the tabs are gradually increased, the values of the laser die-cutting distances D1, D2, …, D n-2 , D n-1 are all equal.

[0009] According to another aspect of the present application, there is provided a laser die-cutting method for laser die-cutting a to-be-die-cut tab according to the laser die-cutting distance obtained by the above-mentioned laser die-cutting distance calculation method.

[0010] According to another aspect of the present application, there is provided a tab formed after laser die-cutting a to-be-die-cut tab according to the above-mentioned laser die-cutting method.

[0011] According to another aspect of the present application, there is provided a roll core comprising the above-mentioned tab, wherein the tab comprises a negative tab and a positive tab, and the roll core comprises a winding layer, the winding layer is arranged on the outer circumferential side of a winding needle, and in the radial direction of the winding needle, the winding layer comprises, in sequence from inside to outside, a diaphragm, a negative tab, a diaphragm, and a positive tab.

[0012] According to another aspect of the present application, there is provided a battery comprising the above-mentioned roll core.

[0013] Further, the battery further comprises a cover plate and a switching piece, and the tabs on the roll core are connected through the switching piece and the cover plate.

[0014] Furthermore, the adapter includes a tab connection portion and a pole connection portion, wherein the tab connection portion is connected to the tab on the winding core, and the pole connection portion is connected to the pole on the cover plate.

[0015] Furthermore, the battery also includes a housing, which is a hollow cavity with an opening at one end, with the winding core located inside the housing and a cover plate sealing the opening of the housing.

[0016] The present invention provides a method for calculating the laser die-cutting blade distance, including determining the width J of a preset tab on the electrode sheet to be die-cut. n , n≥2, and n is a positive integer; where J1, J2, J3, ..., J n-1 J n The widths of the first, second, third, ..., n-1th, and nth tabs, arranged sequentially from the innermost to the outermost ring of the core formed after the electrode sheet to be die-cut is wound, are given respectively; the thicknesses W1 of the positive electrode sheet to be wound, W2 of the negative electrode sheet, W3 of the diaphragm, and the circumference C of the winding needle are obtained; after the electrode sheet to be die-cut is wound to form the core, the laser die-cutting distances D1, D2, ..., D are calculated based on the principle of aligning the geometric center lines of multiple tabs of the same polarity on the core in the width direction. n-2 D n-1 D1 is the laser die-cutting distance between the first and second electrodes; D n-1 Let D1 be the laser die-cutting distance between the (n-1)th electrode tab and the nth electrode tab; where D1 is calculated as follows: when the electrode to be die-cut is a positive electrode, then D... 1正 = (C / π + 4 × W³ + 2 × W²) × π - J 1正 When the electrode to be die-cut is a negative electrode, then D 1负 = (C / π + 2 × W³) × π - J 1负 ;D n-1 The calculation is: D n-1 =[(D n-2 +J n-2 ) / π+4×W3+2×(W1+W2)]×π-J n-1 Among them, calculating D n-1 When n ≥ 3, and n is a positive integer. This application simulates the core using a simplified model and establishes the width J of the tab through a formulaic approach. n Laser die-cutting blade distance D n-1 The mathematical relationship between the thickness W1 of the positive electrode, the thickness W2 of the negative electrode, the thickness W3 of the separator, and the circumference C of the winding needle helps to ensure the accuracy of die cutting, and the method is simple and easy to implement. Attached Figure Description

[0017] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated into and constitute a part of the specification. The drawings illustrate one illustrative embodiment of the application and, although the application is not limited to

[0018] Figure 1 Fig. 4 shows a structure schematic diagram of the positive electrode tab, the negative electrode tab and the separator after being wound on the winding needle according to an optional embodiment of the application, and the structure schematic diagram of the structure formed after the tab is omitted;

[0019] Figure 2 Fig. 5 shows a structure schematic diagram of the axial end surface of the winding core according to an optional embodiment of the application; Figure 1

[0020] Figure 3 Fig. 6 shows a die-cutting schematic diagram of the negative electrode tab according to an optional embodiment of the application;

[0021] Figure 4 Fig. 7 shows a structure schematic diagram of the positive electrode tab and the negative electrode tab after being wound according to an optional embodiment of the application, and the structure schematic diagram of the structure formed after the separator is omitted in the figure.

[0022] In the above drawings, the following reference signs are used:

[0023] 10, winding needle; 20, winding layer; 21, separator; 22, negative electrode tab; 23, positive electrode tab; 24, tab. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the application will be clearly and completely described with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means constitutes any limitation on the application and its application or use. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0025] In order to solve the problem of rapid confirmation of the die-cutting size of the electrode tab in the prior art, the application provides a laser die-cutting knife distance calculation method, a winding core, a battery, and a laser die-cutting method. The battery comprises the winding core, and the winding core is the winding core described above. The laser die-cutting method comprises laser die-cutting the electrode tab to be die-cut according to the laser die-cutting knife distance calculation method described above.

[0026] As shown in Figures 1 to 4 , the laser die-cutting knife distance calculation method comprises:

[0027] determining the width J of the preset tab 24 on the electrode tab to be die-cut n , n≥2, and n is a positive integer; wherein J1, J2, J3, …, J​n-1 , J n The widths of the first, second, third, …, n-1th and nth pole tabs 24 arranged in the direction from the innermost circle to the outermost circle of the roll core formed by the roll-wound to-be-molded pole piece are respectively J

[0028] Obtain the thickness W1 of the positive pole piece 23, the thickness W2 of the negative pole piece 22, the thickness W3 of the separator 21, and the circumference C of the winding needle 10;

[0029] After the to-be-molded pole piece is wound to form a roll core, based on the principle of aligning the geometric center lines of the pole tabs 24 of the same polarity in the width direction thereof on the roll core, the laser mold cutting knife distances D1, D2, …, D n-2 , D n-1 is the laser mold cutting knife distance between the first pole tab 24 and the second pole tab 24; D n-1 is the laser mold cutting knife distance between the n-1th pole tab 24 and the nth pole tab 24;

[0030] D n-1 is calculated as follows: when the to-be-molded pole piece is the positive pole piece 23, then D 1正 = (C / π+4×W3+2×W2)×π-J 1正 ; when the to-be-molded pole piece is the negative pole piece 22, then D 1负 = (C / π+2×W3)×π-J 1负 ;

[0031] D n-1 is calculated as follows: D n-1 = [(D n-2 + J n-2 ) / π+4×W3+2×(W1+W2)]×π-J n-1 ; wherein, when D n-1 is calculated, n≥3, and n is a positive integer.

[0032] The technical scheme of the present application provides a laser mold cutting knife distance calculation method, based on a simplified model to simulate a roll core, and by formulating a mathematical relationship between the width J n of the pole tab 24, the laser mold cutting knife distance D n-1 , the thickness W1 of the positive pole piece, the thickness W2 of the negative pole piece, the thickness W3 of the separator, and the circumference C of the winding needle, the accuracy of mold cutting can be ensured, and the method is simple and easy to implement.

[0033] It should be noted that in the present application, the subscript “positive” in the above D 1正 indicates the positive pole piece 23, and the subscript “negative” in the above D 1负 indicates the negative pole piece 22.

[0034] It can be understood that, as Figure 3 and Figure 4 D1 corresponds to the laser die-cutting gap between the first pole lug 24 of the innermost circle and the second pole lug 24 adjacent thereto. Since the diaphragm 21, the negative pole piece 22, the diaphragm 21 and the positive pole piece 23 are sequentially arranged from inside to outside on the winding needle 10 in general. Therefore, the respective D1 of the negative pole piece 22 and the positive pole piece 23 is different, and the calculation of D1 needs to be divided into two cases at this time:

[0035] For the negative pole piece 22, since there is only one layer of diaphragm 21 between the first negative pole lug 24 and the winding needle, D1 负 = (diameter of the winding needle 10 + 2*thickness of the diaphragm 21) x π - J 1负 , that is, D1 负 = (C / π + 2*W3) x π - J 1负 .

[0036] For the positive pole piece 23, since there are two layers of diaphragm 21 and one layer of negative pole piece 22 between the first positive pole lug 24 and the winding needle, that is, D 1正 = (diameter of the winding needle 10 + 4*thickness of the diaphragm 21 + 2*thickness of the negative pole piece 22) x π - J 1正 , that is, D 1正 = (C / π + 4*W3 + 2*W2) x π - J 1正 .

[0037] For D n-1 , and when n≥3 here, in order to reduce the error, D n-1 and D n-2 can be used to calculate. In addition, the relationship between D n-1 and D n-2 of the positive pole piece 23 and the negative pole piece 22 is the same in this case, so the positive pole piece 23 and the negative pole piece 22 do not need to be distinguished. Specifically, there is one layer of negative pole piece 22, one layer of positive pole piece 23 and two layers of diaphragm 21 between D n-1 and D n-2 , thereby establishing the relationship between D n-1 and D n-2 as follows:

[0038] D n-1(n≥3) = [(D n-2 + J n-2 ) / π + 4*thickness of the diaphragm 21 + 2*(thickness of the positive pole piece 23 + thickness of the negative pole piece 22)] x π - J n-1 ; that is, D n-1 = [(D n-2 + J n-2 ) / π + 4*W3 + 2*(W1 + W2)] x π - Jn-1 .

[0039] Therefore, when calculating D2, D2 = [(D1 + J1) / π + 4 × W3 + 2 × (W1 + W2)] × π - J2. Similarly, D3, D4, …, D n-2 , D n-1 , and so on.

[0040] Specifically, in actual calculation, π can be taken as 3.14 for simplicity.

[0041] In some embodiments, when the widths J1, J2, J3, …, J n-1 , J n of the tabs 24 are all equal, the laser die-cutting distances D1, D2, …, D n-2 , D n-1 are gradually increased.

[0042] In some embodiments, when the widths J1, J2, J3, …, J n-1 , J n of the tabs 24 are gradually increased, the laser die-cutting distances D1, D2, …, D n-2 , D n-1 are all equal.

[0043] In some embodiments, the laser die-cutting distances further include D B and D E , as Figure 3 illustrated, DB is the distance between the winding start side of the pole piece and the first tab 24, and D E is the distance between the winding end side of the pole piece and the last tab 24. Specifically, D B and D E can be adjusted according to specific product requirements (i.e., mainly derived from design input), such as the insertion position of D B and the ending position of D E are both at the corner (R angle) of the winding core, and D B and D E are also related to the positive and negative tab 24 edge distance requirements and the tab 24 width. That is, in practice, D B , D E , as well as the tab 24 width on the positive pole piece 23 and the tab 24 width on the negative pole piece 22 are all determined according to the requirements of specific products.

[0044] By applying the technical solutions of the present application, the present application provides a laser die-cutting method for laser die-cutting the to-be-cut pole piece according to the laser die-cutting distances obtained by the above and below-mentioned laser die-cutting distance calculation methods.

[0045] The application provides an electrode sheet, which is formed after the laser die-cutting method is used to perform laser die-cutting on the electrode sheet to be die-cut.

[0046] The application provides a roll core, which comprises the electrode sheet.

[0047] Specifically, the schematic diagram of the roll core is as shown in the figure. Figure 2 It can be known that, during the winding process, the separator 21 first contacts the winding needle 10, and then the negative electrode sheet 22, then the separator 21, then the positive electrode sheet 23, then the separator 21, and so on. Figure 2 The specific roll core with the tabs 24 is as shown in the figure. Figure 4 The three tabs 24 on the lower left side in the figure are positive electrode tabs 24. Figure 4 The four tabs 24 on the lower right side in the figure are negative electrode tabs 24. Figure 4 The specific roll core with the tabs 24 is as shown in the figure.

[0048] As shown in the figure, the winding process comprises the winding needle 10 and the winding layer 20. Figure 1 The winding layer 20 is arranged on the outer circumferential side of the winding needle 10 and comprises, in the radial direction of the winding needle 10, the separator 21, the negative electrode sheet 22, the separator 21 and the positive electrode sheet 23 from inside to outside.

[0049] The application provides a battery, which comprises the roll core.

[0050] In an embodiment, the battery further comprises a cover plate and a connecting piece.

[0051] In an embodiment, the connecting piece comprises a tab connecting part and a post connecting part.

[0052] In an embodiment, the battery further comprises a shell.

[0053] The application provides a method for calculating a laser die-cutting distance. n, n>=2, and n is a positive integer; wherein J1, J2, J3,..., J n-1 , J n are the widths of the first tab 24, the second tab 24, the third tab 24,..., the (n-1)th tab 24, and the nth tab 24 of the core formed by the winding of the to-be-cut tab from the innermost circle to the outermost circle, respectively; the thickness W1 of the positive electrode tab, the thickness W2 of the negative electrode tab, the thickness W3 of the separator, and the circumference C of the winding needle are obtained; based on the principle of geometric center line alignment of the plurality of tabs 24 of the same polarity on the core after the winding of the to-be-cut tab in the width direction thereof, the laser cutting knife distances D1, D2,..., D n-2 , D n-1 are calculated, wherein D1 is the laser cutting knife distance between the first tab 24 and the second tab 24; D n-1 is the laser cutting knife distance between the (n-1)th tab 24 and the nth tab 24; wherein the calculation of D1 is: when the to-be-cut tab is a positive electrode tab, D 1正 = (C / π+4*W3+2*W2) x π-J 1正 ; when the to-be-cut tab is a negative electrode tab, D 1负 = (C / π+2*W3) x π-J 1负 ; the calculation of D n-1 is: D n-1 = [(D n-2 +J n-2 ) / π+4 x W3+2 x (W1+W2)] x π-J n-1 ; wherein when D n-1 is calculated, n>=3, and n is a positive integer. The present application simulates the core based on a simplified model, and establishes the mathematical relationship between the width J n of the tab 24, the laser cutting knife distance D n-1 , the thickness W1 of the positive electrode tab, the thickness W2 of the negative electrode tab, the thickness W3 of the separator, and the circumference C of the winding needle in a formulaic manner, thereby facilitating the accuracy of cutting, and the method is simple and easy to implement.

[0054] The laser die-cutting distance calculation method provided by the present application effectively improves the precision and efficiency of the laser die-cutting process through accurate parameter acquisition and dynamic size calculation. The application of this method not only optimizes the die-cutting process, but also significantly improves the tab quality in the battery manufacturing process, providing a strong guarantee for the stability and safety of battery performance. In practical applications, this method can significantly improve the production efficiency of batteries, reduce production costs, and ensure high performance and high reliability of batteries, providing advanced technical support for battery manufacturing in new energy vehicle, energy storage equipment and other fields. Especially in the trend of precision and automation of battery manufacturing, the implementation effect of this method is more significant, which can effectively cope with various challenges in the battery manufacturing process and promote the continuous progress of battery manufacturing technology.

[0055] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not meant to limit the scope of the present application. It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for ease of illustration. Techniques, methods, and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the authorized description where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the application as it is oriented in the drawing figures. The terms "on", "above", "under", "below" and derivatives thereof shall relate to the application as it is oriented in the drawing figures. Where, for purposes of clarity, or the like, directional terms are used in the description herein (e.g., "forward", "rearward", "up", "down", "left", "right", "vertical", "horizontal", "upper", "lower", "above", "below", "upward", "downward", "top", "bottom" and the like), it is understood that these terms are used to facilitate the description of the application, and do not limit the scope of the application. For example, if the application is turned over, or rotated 90 degrees, or inverted, the directional terms are reversed. Accordingly, the directional terms are interchangeable under appropriate circumstances such that the application described herein describes the application in one orientation, and is equally applicable to other orientations, unless otherwise specifically noted.

[0058] It is also important to note that the term "or" as used herein is intended to mean any of the possible options. For example, if X or Y or both are present, that covers the options of X being present and Y being absent, Y being present and X being absent, and both X and Y being present.

[0059] It should be noted that the terms "first", "second", and the like, used herein do not necessarily have an ordinal meaning. Rather these terms are generally used to distinguish or identify different structures. Thus, such terms are also inter-changeable under appropriate circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Thus, for example, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0060] The preferred embodiments of the application are described herein with reference to the accompanying drawings, wherein: The application is described and illustrated herein, in the specification, drawings and claims using a wide variety of exemplary language, which is provided solely for the purpose of clarity and illustration. However, the application described and illustrated herein should not necessarily be limited to the specific exemplary embodiments disclosed.

Claims

1. A method for calculating the laser die-cutting blade distance, characterized in that, include: Determine the width J of the pre-set tab (24) on the electrode sheet to be die-cut. n , n≥2, and n is a positive integer; where J1, J2, J3, ..., J n-1 J n The widths of the first tab (24), the second tab (24), the third tab (24), ..., the (n-1)th tab (24), and the nth tab (24) are arranged sequentially from the innermost circle to the outermost circle of the core formed after the die-cut electrode sheet is wound. Obtain the thickness W1 of the positive electrode sheet (23) to be wound, the thickness W2 of the negative electrode sheet (22), the thickness W3 of the separator (21), and the circumference C of the winding needle (10); After the electrode sheet to be die-cut is wound to form the core, the laser die-cutting distances D1, D2, ..., D are calculated based on the alignment principle of the geometric center lines of the multiple tabs (24) of the same polarity on the core in its width direction. n-2 D n-1 D1 is the laser die-cutting distance between the first tab (24) and the second tab (24); D n-1 The laser die-cutting distance is between the (n-1)th electrode (24) and the nth electrode (24); Wherein, D1 is calculated as follows: when the electrode to be die-cut is the positive electrode (23), then D 1正 = (C / π + 4 × W³ + 2 × W²) × π - J 1正 When the electrode to be die-cut is the negative electrode (22), then D 1负 = (C / π + 2 × W³) × π - J 1负 ; D n-1 The calculation is: D n-1 =[(D n-2 +J n-2 ) / π+4×W3+2×(W1+W2)]×π-J n-1 Among them, calculating D n-1 When n≥3, and n is a positive integer.

2. The method for calculating the laser die-cutting blade distance according to claim 1, characterized in that, When the widths of the tabs (24) are J1, J2, J3, ..., J... n-1 J n When the values ​​are all equal, the laser die-cutting blade distances D1, D2, ..., D... n-2 D n-1 The value increases gradually.

3. The method for calculating the laser die-cutting blade distance according to claim 1, characterized in that, When the widths of the tabs (24) are J1, J2, J3, ..., J... n-1 J n As the values ​​gradually increase, the laser die-cutting blade distances D1, D2, ..., D... n-2 D n-1 The values ​​are all equal.

4. A laser die-cutting method, characterized in that, The laser die-cutting blade distance obtained by the laser die-cutting blade distance calculation method according to any one of claims 1 to 3 is used for laser die-cutting of the electrode sheet to be die-cut.

5. An electrode sheet, characterized in that, The electrode to be die-cut is formed by laser die-cutting according to the laser die-cutting method described in claim 4.

6. A type of winding core, characterized in that, Including the electrode sheet as described in claim 5, the electrode sheet comprising a negative electrode sheet (22) and a positive electrode sheet (23), the winding core comprising: The winding layer (20) is wound around the outer periphery of the winding needle (10) and in the radial direction of the winding needle (10), the winding layer (20) includes, from the inside to the outside, a diaphragm (21), the negative electrode plate (22), the diaphragm (21), and the positive electrode plate (23).

7. A battery, characterized in that, Includes a core, wherein the core is the core as described in claim 6.

8. The battery according to claim 7, characterized in that, The battery also includes a cover plate and an adapter plate, and the tabs (24) on the winding core are connected to the cover plate via the adapter plate.

9. The battery according to claim 8, characterized in that, The adapter includes a tab connection part and a pole connection part, wherein the tab connection part is connected to the tab (24) on the winding core, and the pole connection part is connected to the pole on the cover plate.

10. The battery according to claim 9, characterized in that, The battery also includes a housing, which is a hollow cavity with an opening at one end. The winding core is located inside the housing, and the cover plate seals the opening of the housing.

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