Tab die cutting method, device, storage medium and computer program product

Abstract

The present application discloses a method, device, storage medium and computer program product for die-cutting a tab. The method comprises: obtaining the thickness of a pole piece between two adjacent pre-cut tabs among a plurality of pre-cut tabs; determining the target arrangement position of a plurality of pre-cut tabs in the length direction of the tabs according to the thickness of the pole piece between the two adjacent pre-cut tabs; die-cutting the tabs to form a plurality of tabs according to the target arrangement position; wherein, in the case where the nth pre-cut tab is the first pre-cut tab, obtaining the thickness of the pole piece between the first pre-cut tab and the first end of the tab; adjusting the arrangement position of the first pre-cut tab on the tab according to the thickness of the tab to obtain the target arrangement position of the nth pre-cut tab, where n is a positive integer and the first end is an end close to the first pre-cut tab in the length direction of the tab. The method provided by the present application can reduce the risk of tab misalignment and improve the production efficiency and yield rate of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a tab die-cutting method, device, storage medium and computer program product. Background Art

[0002] In the battery cell manufacturing process, in order to increase the battery cell capacity, the length of the pole piece needs to be increased. As the pole piece length increases, the battery cell is prone to the problem of pole tab misalignment. How to solve the problem of pole tab misalignment and improve the yield rate of the battery cell is of great significance to the production of batteries. Summary of the invention

[0003] The present application provides a tab die-cutting method, device, storage medium and computer program product, which can reduce the risk of tab misalignment and improve the production efficiency and yield rate of battery cells.

[0004] In a first aspect, the present application provides a method for die-cutting a pole piece, the method comprising: obtaining the pole piece thickness between two adjacent pre-cut pole pieces among a plurality of pre-cut pole pieces; determining the target arrangement positions of the plurality of pre-cut pole pieces in the length direction of the pole piece according to the pole piece thickness between the two adjacent pre-cut pole pieces; die-cutting the pole piece to form a plurality of pole pieces according to the target arrangement positions; wherein, in the case where the nth pre-cut pole piece is the first pre-cut pole piece, obtaining the pole piece thickness between the first pre-cut pole piece and the first end of the pole piece; adjusting the arrangement position of the first pre-cut pole piece on the pole piece according to the pole piece thickness to obtain the target arrangement position of the nth pre-cut pole piece, wherein n is a positive integer, and the pole piece comprises a first end and a second end along the length direction, the first end being an end close to the first pre-cut pole piece in the length direction of the pole piece, and the second end being an end away from the first pre-cut pole piece in the length direction of the pole piece.

[0005] There are differences in the thickness of the pole pieces between different pole pieces. In the embodiment of the present application, the position of the pre-cut pole piece on the pole piece is dynamically arranged according to the pole piece thickness between two adjacent pole pieces, rather than using a fixed pole piece thickness to determine the arrangement position of the pole piece on the pole piece, so that the pole pieces of the battery cell after winding are arranged in the same position, which solves the problem of pole piece misalignment caused by fluctuations in pole piece thickness, reduces the risk of pole piece misalignment, and improves the production efficiency and yield rate of the battery cell. Moreover, in the embodiment of the present application, by determining the position of the first pre-cut pole piece, a reference is provided for the arrangement position of other pre-cut pole pieces, reducing the risk of pole piece misalignment.

[0006] In some embodiments, obtaining the pole piece thickness between two adjacent pre-cut pole ears among a plurality of pre-cut pole ears includes: obtaining the initial arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole sheet; and determining the pole piece thickness corresponding to the pole sheet between two adjacent pre-cut pole ears according to the initial arrangement positions.

[0007] By determining the pole sheet thickness between two adjacent pre-cut pole tabs, a dynamic pole sheet thickness is used instead of a fixed pole sheet thickness when determining the arrangement position of the pre-cut pole tabs on the pole sheet, thereby reducing the risk of pole tab misalignment caused by pole sheet thickness fluctuations and improving the production efficiency and yield rate of the battery cell.

[0008] In some embodiments, obtaining the initial arrangement positions of multiple pre-cut pole ears in the length direction of the pole piece includes: obtaining a preset pole sheet thickness corresponding to the pole sheet; and determining the initial arrangement positions of multiple pre-cut pole ears in the length direction of the pole sheet based on the preset pole sheet thickness.

[0009] By using a preset pole piece thickness to determine the initial arrangement position of the pre-cut pole ear, the pole sheet can be divided into multiple pole segments according to the initial arrangement position of the pre-cut pole ear, and then the pole sheet thickness corresponding to each pole segment can be calculated, thereby realizing the dynamic acquisition of the pole sheet thickness. In the subsequent process, the target arrangement position of the pre-cut pole ear is determined using the dynamically acquired pole sheet thickness, which can reduce the risk of pole ear misalignment caused by fluctuations in pole sheet thickness and improve the production efficiency and yield of the battery cell.

[0010] In some embodiments, the initial arrangement positions of multiple pre-cut pole ears in the length direction of the pole sheet are determined based on a preset pole sheet thickness, including: when the nth pre-cut pole ear among the multiple pre-cut pole ears is not the first pre-cut pole ear, the pole sheet distance between the nth pre-cut pole ear and the first end of the pole sheet is calculated based on the preset pole sheet thickness; the sum of the pole sheet distances between two adjacent pre-cut pole ears among the first n-1 pre-cut pole ears is calculated to obtain the pole sheet distance of the first n-1 pre-cut pole ears; the difference between the pole sheet distance of the nth pre-cut pole ear and the pole sheet distance of the first n-1 pre-cut pole ears is calculated to obtain the pole sheet distance between the nth pre-cut pole ear and the n-1th pre-cut pole ear; and the initial arrangement position of the nth pre-cut pole ear on the pole sheet is determined based on the pole sheet distance between the nth pre-cut pole ear and the n-1th pre-cut pole ear.

[0011] By using the preset pole sheet thickness to determine the initial arrangement position of the pre-cut pole ears, so that in the subsequent process, the real-time pole sheet thickness can be used to determine the target arrangement position of the pre-cut pole ears, the risk of pole ear misalignment caused by fluctuations in pole sheet thickness can be reduced, thereby improving the production efficiency and yield rate of the battery cell.

[0012] In some embodiments, when the nth pre-cut pole lug is the first pre-cut pole lug, the preset pole lug position is determined as the initial arrangement position of the nth pre-cut pole lug, thereby providing a reference for the arrangement positions of other pre-cut pole lugs by determining the position of the first pre-cut pole lug.

[0013] In some embodiments, the pole piece thickness corresponding to the pole piece between two adjacent pre-cut pole ears is determined according to the initial arrangement position, and the pole piece is divided into a plurality of pole segments according to the initial arrangement position; along the length direction of the pole piece, multi-point sampling is performed on each pole segment according to a preset sampling interval to obtain a plurality of sampling thicknesses corresponding to each pole segment; the mean of the plurality of sampling thicknesses of each pole segment is calculated to obtain the pole piece thickness corresponding to each pole segment.

[0014] The pole piece thickness corresponding to the pole piece between two adjacent pre-cut pole pieces is determined according to the initial arrangement position, and the target arrangement position of the pre-cut pole piece on the pole piece is determined according to the thickness between the two adjacent pre-cut pole pieces, so as to reduce the risk of pole piece misalignment caused by fluctuations in pole piece thickness.

[0015] In some embodiments, the target arrangement positions of multiple pole ears in the length direction of the pole sheet are determined based on the circumference of the winding needle and the pole sheet thickness between two adjacent pole ears, including: when the nth pole ear is not the first pole ear, the pole sheet distance between the nth pole ear and the starting end of the pole sheet is calculated based on the circumference of the winding needle and the pole sheet thickness of the pole segment corresponding to the nth pole ear; the sum of the pole sheet distances between two adjacent pole ears in the first n-1 pole ears is calculated to obtain the pole sheet distance of the first n-1 pole ears; the difference between the pole sheet distance of the nth pole ear and the pole sheet distance of the first n-1 pole ears is calculated to obtain the pole sheet distance between the nth pole ear and the n-1th pole ear; according to the pole sheet distance between the nth pole ear and the n-1th pole ear, the target arrangement position of the nth pole ear on the pole sheet is determined.

[0016] By using the dynamically changing thickness of the pole piece to determine the target arrangement position of the pole lug, the risk of pole lug misalignment caused by fluctuations in pole piece thickness can be reduced, thereby improving the production efficiency and yield rate of the battery cell.

[0017] In the second aspect, the present application also provides a tab die-cutting device, which includes: a data acquisition module for acquiring the circumference of a winding needle and the thickness of a pole piece between two adjacent tabs among a plurality of tabs; a position determination module for determining the target arrangement positions of a plurality of tabs in the length direction of the pole piece according to the circumference of the winding needle and the thickness of a pole piece between two adjacent tabs; the position determination module is also used to obtain the thickness of a pole piece between a first pre-cut tab and a first end of a pole piece when the nth pre-cut tab is the first pre-cut tab; the arrangement position of the first pre-cut tab on the pole piece is adjusted according to the thickness of the pole piece to obtain the target arrangement position of the nth pre-cut tab, wherein n is a positive integer, and the pole piece includes a first end and a second end along the length direction, the first end being an end close to the first pre-cut tab in the length direction of the pole piece, and the second end being an end away from the first pre-cut tab in the length direction of the pole piece.

[0018] In a third aspect, the present application provides a readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the tab die-cutting method described in the first aspect is implemented.

[0019] In a fourth aspect, the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the tab die-cutting method as described in the first aspect.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of pole piece winding under ideal conditions;

[0023] Figure 2 It is a schematic diagram of the pole piece winding in actual state;

[0024] Figure 3 A flowchart of a tab die cutting method according to an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the target arrangement position of the pole lugs on the pole piece according to one embodiment of the present application;

[0026] Figure 5 A flow chart of a method for determining the thickness of a pole piece according to an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the initial arrangement positions of a plurality of pole tabs on a pole piece according to an embodiment of the present application;

[0028] Figure 7 A flow chart of a method for determining the initial arrangement positions of a plurality of pole tabs on a pole piece according to an embodiment of the present application;

[0029] Figure 8 A flow chart of a method for determining the initial arrangement positions of a plurality of tabs according to an embodiment of the present application;

[0030] Fig. 9 A flow chart of a method for determining the thickness of a pole piece between two adjacent pole ears according to an embodiment of the present application;

[0031] Fig.10A flow chart of a method for determining target arrangement positions of a plurality of tabs according to an embodiment of the present application;

[0032] Fig.11 This is a schematic diagram of a tab die-cutting device according to another embodiment of the present application.

[0033] In the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Mentioning "embodiment" in the embodiments of the present application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiment described in the embodiments of the present application can be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] At present, in the process of manufacturing battery cells, first, the position and size of the tabs on the cathode and anode plates of the battery cells are designed, and then the tabs are cut on the cathode and anode plates by laser die-cutting technology to ensure that the tabs on each circle of the plate remain in the same position after the plate is wound by the winding equipment, which is convenient for the subsequent welding and assembly of the battery cells.

[0043] In the existing battery cell process design, the capacity of a single battery cell can be increased by increasing the length of the electrode sheet while keeping the electrode sheet width unchanged. However, as the length of the electrode sheet increases, the thickness of the single battery cell gradually increases. Affected by process fluctuations, the change in electrode sheet thickness is also significantly amplified, and the single battery cell after winding is more prone to the problem of misalignment of the pole lugs. For example, under ideal conditions, the thickness T of the pole sheet remains unchanged. In the process of designing the battery cell, the positions of all the pole lugs in the battery cell are calculated, and the die-cutting dimensions are determined. The pole sheet is then wound with a winding needle. During the winding process, the pole lugs of each turn of the battery cell can be aligned, thereby obtaining Figure 1The schematic diagram of the winding of the pole piece under the ideal state is shown in the figure. In actual production, the thickness of the pole piece is constantly changing due to the influence of the process. Since the position of the first pole ear is fixed, all the pole ear positions are aligned with the first pole ear as the reference. When the pole sheet thickness T increases, the calculated distance between the pole ears increases. However, in the actual production process of the battery cell, the pole sheet thickness is assumed to be fixed by default, which leads to the phenomenon of misalignment of the pole ears during the actual winding process of the pole sheet as the pole sheet thickness changes, such as Figure 2 The schematic diagram of the pole piece winding in the actual state is shown.

[0044] Moreover, the actual production of battery cells has also proved that the proportion of lug misalignment gradually worsens with the increase of electrode length. At the same time, in actual production, reverse investigation of the thickness / length change of the electrode will only be carried out after batch misalignment occurs in the winding of the electrode. At this time, a batch of defective products have been scrapped, and there is an obvious lag in the only way to realize it, which greatly affects the production efficiency and yield rate of the battery cells.

[0045] To sum up, in the relevant technology, the die-cutting size design of the tab is fixed before mass production. In the actual production process, affected by the equipment, personnel operation, etc., the thickness of the pole piece has abnormal fluctuations, which leads to abnormal misalignment of the tab during the winding process of the single battery cell and cannot be adjusted in time.

[0046] To solve the above problems, the embodiments of the present application provide a method, device, storage medium and computer program product for tab die cutting. In the embodiments of the present application, the thickness of the pole piece is detected in real time to achieve accurate measurement of the thickness of the pole piece, and then the real-time thickness data of the pole piece is analyzed to achieve intelligent adjustment of the tab die cutting position, thereby adjusting the tab die cutting size from a fixed size to a dynamic size, reducing the risk of tab misalignment and improving the production efficiency and yield rate of the battery cell.

[0047] In one embodiment, Figure 3 A flow chart of a tab die-cutting method is shown, and the method can be applied to a tab die-cutting system. As an example, the tab die-cutting system can include a thickness detection device, a data processing device, and a tab die-cutting device, wherein the thickness detection device can measure the thickness of the pole piece in real time, and transmit the measured thickness to the data processing device, so that the data processing device determines the tab position according to the real-time thickness of the pole piece; and then the tab die-cutting device performs tab die-cutting on the pole piece according to the arrangement position of the tab determined by the data processing device.

[0048] It should be noted that in the above embodiments, the thickness detection equipment can measure the thickness of the pole piece in real time by laser detection, can also measure the thickness of the pole piece in real time by image recognition, and can also detect the thickness of the pole piece in real time by other methods that can detect thickness, which will not be listed one by one here.

[0049] like Figure 3 As shown, the tab die cutting method may include the following steps S301 to S303:

[0050] Step S301, obtaining the thickness of the electrode sheet between two adjacent pre-cut electrode tabs among a plurality of pre-cut electrode tabs.

[0051] In step S301, for winding a single cell, when producing the cell, the electrode sheet needs to be wound on a winding needle, such as Figure 1 and Figure 2 As shown. The winding needle is a mechanical structure. When the design requirements of the battery cell are determined, the circumference of the winding needle is usually fixed. As an example, the circumference of the winding needle L=2πR, where R is the radius of the winding needle.

[0052] In addition, in step S301, the existing pole ear die-cutting method can be used to determine the position between two adjacent pre-cut pole ears in the pole piece, and then the pole sheet thickness between two adjacent pre-cut pole ears in the pole piece can be detected in real time by a thickness detection device, thereby realizing dynamic measurement of the pole sheet thickness. Compared with the existing method of using a fixed pole sheet thickness to determine the pole ear position, the embodiment of the present application uses the real-time determined pole sheet thickness to determine the pole ear position, which can improve the accuracy of pole ear die-cutting and thereby reduce the risk of pole ear misalignment.

[0053] Step S302, determining the target arrangement positions of the plurality of pre-cut pole tabs in the length direction of the pole sheet according to the thickness of the pole sheet between two adjacent pre-cut pole tabs.

[0054] In step S302, the target arrangement position of the plurality of pre-cut tabs may be characterized by the distance between two adjacent pre-cut tabs, or by the distance between the other pre-cut tabs and the first pre-cut tab, or by the distance between the pre-cut tab and the first end of the pole piece along the length direction. In the embodiment of the present application, the distance between two adjacent pre-cut tabs is used as an example to illustrate the arrangement position of the pre-cut tabs.

[0055] As an example, the target arrangement position of the pre-cut tab on the pole piece can be as follows: Figure 4 As shown, in Figure 4 In the process, the pre-cut tab R is along the length direction of the pole piece (such as Figure 4', D2', D3', D4', D5', and Dn' are respectively the distances between the first pre-cut tab and the first end of the pole piece, D2' is the distance between the second pre-cut tab and the first pre-cut tab, D3' is the distance between the third pre-cut tab and the second pre-cut tab, D4' is the distance between the fourth pre-cut tab and the third pre-cut tab, D5' is the distance between the fifth pre-cut tab and the fourth pre-cut tab, and Dn' is the distance between the nth pre-cut tab and the n-1th pre-cut tab. In an embodiment of the present application, the distance between the pre-cut pole ears can be the distance between the center lines of the two pre-cut pole ears, or the distance between the starting ends of the two pre-cut pole ears, or the distance between the ending ends of the two pre-cut pole ears. In an embodiment of the present application, the distance between the center lines of the two pre-cut pole ears is used as an example for explanation.

[0056] In step S302, the arrangement position of the pre-cut pole lugs on the pole sheet is determined by the circumference of the winding needle and the pole sheet thickness between two adjacent pre-cut pole lugs. This method takes into account the impact of the dynamic change of the pole sheet thickness on the pole lug position, thereby reducing the risk of pole lug misalignment caused by uneven pole sheet thickness.

[0057] Step S303 , die-cutting the electrode piece to form a plurality of electrode ears according to the target arrangement position.

[0058] After determining the target arrangement position of the pre-die-cut tabs on the pole piece, the tab die-cutting equipment can perform tab die-cutting at the target arrangement position on the pole piece.

[0059] Based on the scheme defined by the above steps S301 to S303, it can be known that there are differences in the thickness of the pole sheets between different pole ears. In the embodiment of the present application, the position of the pre-cut pole ear on the pole sheet is dynamically arranged according to the pole sheet thickness between two adjacent pole ears, rather than using a fixed pole sheet thickness to determine the arrangement position of the pole ear on the pole sheet, so that the pole ears of the battery cell after winding are arranged in the same position, which solves the problem of pole ear misalignment caused by fluctuations in pole sheet thickness, reduces the risk of pole ear misalignment, and improves the production efficiency and yield rate of the battery cell.

[0060] The specific implementation process of the method provided in the embodiment of the present application is introduced below.

[0061] In one embodiment, in the tab die-cutting method provided in the embodiment of the present application, it is first necessary to obtain the thickness of the pole piece between two adjacent pre-cut tabs among a plurality of pre-cut tabs. Figure 5 As shown in the flowchart of the method for determining the thickness of the pole piece, the process includes the following steps S501 to S502:

[0062] Step S501, obtaining the initial arrangement positions of a plurality of pre-cut pole ears in the length direction of the pole piece;

[0063] Step S502, determining the electrode thickness corresponding to the electrode between two adjacent pre-cut electrode tabs according to the initial arrangement position.

[0064] It should be noted that in the embodiment of the present application, the target arrangement position of the multiple pre-cut pole ears is determined by the pole sheet thickness between two adjacent pre-cut pole ears. Therefore, it is necessary to obtain the pole sheet thickness between two adjacent pre-cut pole ears. Before obtaining the pole sheet thickness between two adjacent pre-cut pole ears, it is necessary to determine the initial arrangement positions of the multiple pre-cut pole ears, and then the pole sheet thickness between two adjacent pre-cut pole ears can be determined based on the initial arrangement positions of the multiple pre-cut pole ears.

[0065] By determining the pole sheet thickness between two adjacent pre-cut pole tabs, a dynamic pole sheet thickness is used instead of a fixed pole sheet thickness when determining the arrangement position of the pole tab on the pole sheet, thereby reducing the risk of pole tab misalignment caused by pole sheet thickness fluctuations and improving the production efficiency and yield rate of the battery cell.

[0066] As an example, Figure 6 A schematic diagram showing the initial arrangement positions of multiple pre-cut tabs on a pole piece, and Figure 4 Similar, in Figure 6 , DI, D2, D3, D4, D5, and Dn are respectively the distances between the first pre-cut tab and the first end of the pole piece, D2 is the distance between the second pre-cut tab and the first pre-cut tab, D3 is the distance between the third pre-cut tab and the second pre-cut tab, D4 is the distance between the fourth pre-cut tab and the third pre-cut tab, D5 is the distance between the fifth pre-cut tab and the fourth pre-cut tab, and Dn is the distance between the nth pre-cut tab and the n-1th pre-cut tab, wherein the distance between two pre-cut tabs is the distance between the center lines of the two pre-cut tabs.

[0067] In one embodiment, the initial arrangement positions of the plurality of pre-cut tabs on the pole piece can be Figure 7 The method shown is determined by Figure 7 It can be seen that the method includes the following steps:

[0068] Step S5011, obtaining a preset electrode thickness corresponding to the electrode;

[0069] Step S5012, determining the initial arrangement positions of the plurality of pre-cut pole tabs in the length direction of the pole piece according to the preset pole piece thickness.

[0070] In the above steps S5011 to S5012, the preset electrode sheet thickness is pre-set and can be specifically determined according to the design requirements of the battery cell. That is, in the embodiment of the present application, when the design requirements of the battery cell are determined, the theoretical thickness of the electrode sheet can be used as the preset electrode sheet thickness, and then the preset electrode sheet thickness is used to determine the initial arrangement position of the pre-cut electrode ear in the length direction of the electrode sheet.

[0071] By using a preset pole piece thickness to determine the initial arrangement position of the pre-cut pole ear, the pole sheet can be divided into multiple pole segments according to the initial arrangement position of the pre-cut pole ear, and then the pole sheet thickness corresponding to each pole segment can be calculated, thereby realizing the dynamic acquisition of the pole sheet thickness. In the subsequent process, the target arrangement position of the pre-cut pole ear is determined using the dynamically acquired pole sheet thickness, which can reduce the risk of pole ear misalignment caused by fluctuations in pole sheet thickness and improve the production efficiency and yield of the battery cell.

[0072] In one embodiment, in the process of determining the initial arrangement position of the pre-die-cut pole ear, after obtaining the preset pole sheet thickness of the pole sheet, the initial arrangement position of the plurality of pre-die-cut pole ears in the length direction of the pole sheet can be determined according to the winding needle circumference and the preset pole sheet thickness. The process is as follows: Figure 8 As shown:

[0073] Step S50121, when the nth pre-cut tab is the first pre-cut tab, the preset tab position is used to determine the initial arrangement position of the nth pre-cut tab. That is, the position of the first pre-cut tab is a fixed position, which can be determined according to the design requirements of the battery cell, wherein the position of the first pre-cut tab can be represented by the distance between the first pre-cut tab and the first end of the pole piece.

[0074] By determining the position of the first pre-cut tab, a reference is provided for the arrangement positions of other pre-cut tabs.

[0075] Step S50122, when the nth pre-cut pole ear among multiple pre-cut pole ears is not the first pre-cut pole ear, calculate the pole sheet distance between the nth pre-cut pole ear and the first end of the pole sheet according to the preset pole sheet thickness; calculate the sum of the pole sheet distances between two adjacent pre-cut pole ears among the first n-1 pre-cut pole ears, and obtain the pole sheet distance of the first n-1 pre-cut pole ears; calculate the difference between the pole sheet distance of the nth pre-cut pole ear and the pole sheet distance of the first n-1 pre-cut pole ears, and obtain the pole sheet distance between the nth pre-cut pole ear and the n-1 pre-cut pole ear; determine the initial arrangement position of the nth pre-cut pole ear on the pole sheet according to the pole sheet distance between the nth pre-cut pole ear and the n-1 pre-cut pole ear.

[0076] In steps S50121-S50122, n is a positive integer, and the pole piece includes a first end and a second end along the length direction, the first end is an end close to the first pre-cut pole ear in the length direction of the pole piece; the second end is an end away from the first pre-cut pole ear in the length direction of the pole piece.

[0077] In one example, the pole piece distance between the nth pre-cut pole tab and the n-1th pre-cut pole tab can be determined by formula (1):

[0078] (1)

[0079] In formula (1), is the distance between the nth pre-cut tab and the n-1th pre-cut tab, is the preset pole piece thickness; is the circumference of the rolling needle; It is the distance between the first pre-cut pole ear and the first end of the pole piece.

[0080] By using the preset pole sheet thickness to determine the initial arrangement position of the pre-cut pole ears, so that in the subsequent process, the real-time pole sheet thickness can be used to determine the target arrangement position of the pre-cut pole ears, the risk of pole ear misalignment caused by fluctuations in pole sheet thickness can be reduced, thereby improving the production efficiency and yield rate of the battery cell.

[0081] It should be noted that the use of a fixed pole piece thickness to determine the arrangement position of the pre-cut pole lugs will be affected by the fluctuation of the pole piece thickness, thereby causing the pole lugs to be misaligned. To solve this problem, in an embodiment of the present application, after determining the initial arrangement position of the pre-cut pole lugs on the pole piece, the pole piece thickness corresponding to the pole piece between two adjacent pre-cut pole lugs can be determined according to the initial arrangement position, thereby determining the target arrangement position of the pre-cut pole lugs on the pole piece according to the pole piece thickness between two adjacent pre-cut pole lugs, so as to reduce the risk of pole lug misalignment caused by fluctuations in pole piece thickness.

[0082] In one embodiment, the thickness of the pole piece between two adjacent pre-cut pole ears can be Fig. 9 The method shown is to determine:

[0083] Step S901, dividing the pole piece into a plurality of pole segments according to the initial arrangement position;

[0084] Step S902, performing multi-point sampling on each pole segment according to a preset sampling interval along the length direction of the pole piece to obtain multiple sampling thicknesses corresponding to each pole segment;

[0085] Step S903, calculating the mean of multiple sampled thicknesses of each pole segment to obtain the pole piece thickness corresponding to each pole segment.

[0086] As an example, the pole piece between two adjacent pre-cut pole ears is divided into a pole segment, such as Figure 6 As shown, the pole piece between the first pre-cut pole ear and the second pre-cut pole ear is a pole segment. The thickness detection device can perform multi-point sampling on each pole segment according to a preset sampling interval. For example, the thickness detection device performs sampling on the pole piece at every preset sampling interval (for example, 1mm) along the length direction of the pole piece, thereby obtaining multiple sampling thicknesses corresponding to each pole segment. Then, the multiple sampling thicknesses corresponding to each pole segment are averaged to obtain the pole piece thickness corresponding to each pole segment.

[0087] Furthermore, after determining the electrode thickness corresponding to each electrode segment, the target arrangement positions of the plurality of pre-cut electrode tabs in the length direction of the electrode tab can be determined according to the winding needle circumference and the electrode thickness between two adjacent pre-cut electrode tabs. Fig.10 As shown, the process includes the following steps S3021 to S3022:

[0088] Step S3021, when the nth pre-cut pole ear is the first pre-cut pole ear, obtain the pole sheet thickness between the first pre-cut pole ear and the first end of the pole sheet; adjust the arrangement position of the first pre-cut pole ear on the pole sheet according to the pole sheet thickness to obtain the target arrangement position of the nth pre-cut pole ear.

[0089] In one example, the position of the first pre-cut pole ear is a fixed position, which can be determined according to the design requirements of the battery cell, wherein the position of the first pre-cut pole ear can be represented by the distance between the first pre-cut pole ear and the first end of the pole piece.

[0090] In the case where the position of the first pre-cut pole ear is not reasonably determined, the position of the first pre-cut pole ear can also be adjusted according to the pole piece thickness corresponding to the first pre-cut pole ear using the method provided in the embodiment of the present application.

[0091] By determining the position of the first pre-cut tab, a reference is provided for the arrangement positions of other pre-cut tabs.

[0092] Step S3022, when the nth pre-cut pole ear is not the first pre-cut pole ear, calculate the pole sheet distance between the nth pre-cut pole ear and the first end of the pole sheet according to the pole sheet thickness of the pole segment corresponding to the nth pre-cut pole ear; calculate the sum of the pole sheet distances between two adjacent pre-cut pole ears in the first n-1 pre-cut pole ears, and obtain the pole sheet distance of the first n-1 pre-cut pole ears; calculate the difference between the pole sheet distance of the nth pre-cut pole ear and the pole sheet distance of the first n-1 pre-cut pole ears, and obtain the pole sheet distance between the nth pre-cut pole ear and the n-1 pre-cut pole ear; determine the target arrangement position of the nth pre-cut pole ear on the pole sheet according to the pole sheet distance between the nth pre-cut pole ear and the n-1 pre-cut pole ear.

[0093] In step S3021-step S3022, n is a positive integer, and the pole piece includes a first end and a second end along the length direction, the first end is an end close to the first pre-cut pole ear in the length direction of the pole piece, and the second end is an end away from the first pre-cut pole ear in the length direction of the pole piece.

[0094] In one example, the pole piece distance between the nth pre-cut pole tab and the n-1th pre-cut pole tab can be determined by formula (2):

[0095] (2)

[0096] In formula (2), is the pole piece distance between the nth pre-cut pole tab and the n-1th pre-cut pole tab; is the thickness of the pole piece corresponding to the nth pre-cut pole ear; is the circumference of the rolling needle; It is the distance between the first pre-cut pole ear and the first end of the pole piece.

[0097] It can be seen from formula (2) that in the process of determining the arrangement position of the pre-cut pole ear on the pole piece, a fixed pole piece thickness is not used. Instead, the pole piece thickness required for arranging the pre-cut pole ear is determined according to the arrangement order of the pre-cut pole ear on the pole piece. That is, in the embodiment of the present application, the pole piece thickness corresponding to the pre-cut pole ear is dynamically changed.

[0098] By using the dynamically changing pole sheet thickness to determine the target arrangement position of the pre-cut pole lugs, the risk of pole lug misalignment due to fluctuations in pole sheet thickness can be reduced, thereby improving the production efficiency and yield rate of the battery cells.

[0099] This completes the explanation of the method provided in the embodiments of the present application.

[0100] As can be seen from the above introduction, in the embodiment of the present application, by collecting the data of the thickness of the pole piece in real time and using the formula for determining the arrangement position of the pole ear to determine the arrangement position of the pre-die-cut pole ear on the pole piece, after the pole piece is wound on the winding needle, all the pre-die-cut pole ears are aligned with the first pre-die-cut pole ear, thereby improving the influence of the fluctuation of the pole piece thickness on the misalignment of the pole ear of a single battery cell, and improving the production efficiency and quality rate of the battery cell. In addition, the die-cutting size can be adjusted in real time according to the actual production situation to adapt to the changing manufacturing scenarios and reduce the risk of pole ear misalignment.

[0101] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0102] In one embodiment, Fig.11 A schematic diagram of a tab die cutting device is shown. Fig.11 It can be known that the tab die-cutting device 1100 includes: a data acquisition module 1101 , a position determination module 1102 and a tab die-cutting module 1103 .

[0103] A data acquisition module 1101 is used to acquire the thickness of a pole piece between two adjacent pre-cut pole ears among a plurality of pre-cut pole ears;

[0104] A position determination module 1102 is used to determine the target arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole sheet according to the thickness of the pole sheet between two adjacent pre-cut pole ears;

[0105] The tab die-cutting module 1103 is used to die-cut the pole piece to form a plurality of tabs according to the target arrangement position.

[0106] In one example, the data acquisition module includes: an initial position acquisition module and a thickness determination module. The initial position acquisition module is used to obtain the initial arrangement position of multiple pre-cut pole ears in the length direction of the pole piece; the thickness determination module is used to determine the pole piece thickness corresponding to the pole piece between two adjacent pre-cut pole ears according to the initial arrangement position.

[0107] In one example, the initial position acquisition module includes: a preset thickness acquisition module and an initial arrangement module. The preset thickness acquisition module is used to obtain the preset pole piece thickness corresponding to the pole piece; the initial arrangement module is used to determine the initial arrangement positions of multiple pre-cut pole ears in the length direction of the pole piece according to the preset pole piece thickness.

[0108] In one example, the initial arrangement module is specifically used to calculate the pole piece distance between the nth pre-cut pole piece and the first end of the pole piece according to the preset pole piece thickness when the nth pre-cut pole piece among the multiple pre-cut pole pieces is not the first pre-cut pole piece, wherein n is a positive integer, the pole piece includes a first end and a second end along the length direction, the first end is an end close to the first pre-cut pole piece in the length direction of the pole piece, and the second end is an end away from the first pre-cut pole piece in the length direction of the pole piece; Calculate the sum of the pole piece distances between two adjacent pre-cut pole ears in the first n-1 pre-cut pole ears to obtain the pole piece distance of the first n-1 pre-cut pole ears; calculate the difference between the pole piece distance of the nth pre-cut pole ear and the pole piece distance of the first n-1 pre-cut pole ears to obtain the pole piece distance between the nth pre-cut pole ear and the n-1th pre-cut pole ear; determine the initial arrangement position of the nth pre-cut pole ear on the pole piece according to the pole piece distance between the nth pre-cut pole ear and the n-1th pre-cut pole ear. In the case where the nth pre-cut pole ear is the first pre-cut pole ear, the preset pole ear position is determined as the initial arrangement position of the nth pre-cut pole ear.

[0109] In one example, the thickness determination module is specifically used to divide the pole piece into multiple pole segments according to the initial arrangement position; along the length direction of the pole piece, multi-point sampling is performed on each pole segment according to a preset sampling interval to obtain multiple sampling thicknesses corresponding to each pole segment; the average of the multiple sampling thicknesses of each pole segment is calculated to obtain the pole piece thickness corresponding to each pole segment.

[0110] In one example, the position determination module is specifically used to calculate the pole piece distance between the nth pre-cut pole ear and the first end of the pole piece according to the pole piece thickness of the pole segment corresponding to the nth pre-cut pole ear when the nth pre-cut pole ear is not the first pre-cut pole ear, wherein n is a positive integer, and the pole piece includes a first end and a second end along the length direction, the first end is an end close to the first pre-cut pole ear in the length direction of the pole piece, and the second end is an end away from the first pre-cut pole ear in the length direction of the pole piece. end; calculate the sum of the pole piece distances between two adjacent pre-die-cut pole ears in the first n-1 pre-die-cut pole ears to obtain the pole piece distance of the first n-1 pre-die-cut pole ears; calculate the difference between the pole piece distance of the nth pre-die-cut pole ear and the pole piece distance of the first n-1 pre-die-cut pole ears to obtain the pole piece distance between the nth pre-die-cut pole ear and the n-1th pre-die-cut pole ear; determine the target arrangement position of the nth pre-die-cut pole ear on the pole piece according to the pole piece distance between the nth pre-die-cut pole ear and the n-1th pre-die-cut pole ear. In the case where the nth pre-die-cut pole ear is the first pre-die-cut pole ear, obtain the pole piece thickness between the first pre-die-cut pole ear and the first end of the pole piece; adjust the arrangement position of the first pre-die-cut pole ear on the pole piece according to the pole piece thickness to obtain the target arrangement position of the nth pre-die-cut pole ear.

[0111] In one embodiment, the present application further provides a readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the above-mentioned tab die-cutting method is implemented.

[0112] In one embodiment, the present application further provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the above-mentioned tab die-cutting method.

[0113] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0114] The functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. "Machine-readable medium" may include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0115] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0116] The above reference to the flowchart and / or block diagram of the ear die cutting method, device, storage medium and computer program product according to the embodiment of the present application describes various aspects of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for die-cutting a tab, characterized in that: include: Obtaining a thickness of a pole piece between two adjacent pre-cut pole ears among a plurality of pre-cut pole ears; Determining target arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole sheet according to the pole sheet thickness between two adjacent pre-cut pole ears; According to the target arrangement position, die-cutting the pole piece to form a plurality of pole ears; Wherein, when the nth pre-cut pole ear is the first pre-cut pole ear, the pole sheet thickness between the first pre-cut pole ear and the first end of the pole sheet is obtained; the arrangement position of the first pre-cut pole ear on the pole sheet is adjusted according to the pole sheet thickness to obtain the target arrangement position of the nth pre-cut pole ear, wherein n is a positive integer, and the pole sheet includes the first end and the second end along the length direction, the first end is an end close to the first pre-cut pole ear in the length direction of the pole sheet, and the second end is an end away from the first pre-cut pole ear in the length direction of the pole sheet.

2. The method according to claim 1, characterized in that The step of obtaining the thickness of the electrode sheet between two adjacent pre-cut electrode tabs in the plurality of pre-cut electrode tabs comprises: Acquire the initial arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole piece; The thickness of the pole piece corresponding to the pole piece between the two adjacent pre-cut pole ears is determined according to the initial arrangement position.

3. The method according to claim 2, characterized in that The obtaining of the initial arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole piece includes: Obtaining a preset pole piece thickness corresponding to the pole piece; According to the preset pole piece thickness, the initial arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole piece are determined.

4. The method according to claim 3, characterized in that Determining the initial arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole sheet according to the preset pole sheet thickness includes: When the nth pre-cut pole lug among the plurality of pre-cut pole lugs is not the first pre-cut pole lug, calculating the pole piece distance between the nth pre-cut pole lug and the first end of the pole piece according to the preset pole piece thickness; Calculating the sum of the pole piece distances between two adjacent pre-cut pole ears in the first n-1 pre-cut pole ears to obtain the pole piece distances of the first n-1 pre-cut pole ears; Calculating the difference between the pole piece distance of the nth pre-cut pole tab and the pole piece distance of the first n-1 pre-cut pole tabs to obtain the pole piece distance between the nth pre-cut pole tab and the n-1th pre-cut pole tab; The initial arrangement position of the nth pre-die-cut electrode tab on the electrode tab is determined according to the electrode sheet distance between the nth pre-die-cut electrode tab and the n-1th pre-die-cut electrode tab.

5. The method according to claim 4, characterized in that The method further comprises: In the case where the nth pre-cut electrode tab is the first pre-cut electrode tab, the preset electrode tab position is determined as the initial arrangement position of the nth pre-cut electrode tab.

6. The method according to any one of claims 2 to 5, characterized in that The step of determining the electrode thickness corresponding to the electrode between the two adjacent pre-cut electrode ears according to the initial arrangement position includes: Dividing the pole piece into a plurality of pole segments according to the initial arrangement position; Performing multi-point sampling on each pole segment according to a preset sampling interval along the length direction of the pole piece to obtain multiple sampling thicknesses corresponding to each pole segment; The average of multiple sampled thicknesses of each pole segment is calculated to obtain the pole piece thickness corresponding to each pole segment.

7. The method according to claim 6, characterized in that The step of determining the target arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole ear according to the pole sheet thickness between the two adjacent pre-cut pole ears comprises: When the nth pre-cut electrode tab is not the first pre-cut electrode tab, a pole piece distance between the nth pre-cut electrode tab and the first end of the pole piece is calculated according to a pole piece thickness of a pole segment corresponding to the nth pre-cut electrode tab; Calculating the sum of the pole piece distances between two adjacent pre-cut pole ears in the first n-1 pre-cut pole ears to obtain the pole piece distances of the first n-1 pre-cut pole ears; Calculating the difference between the pole piece distance of the nth pre-cut pole tab and the pole piece distance of the first n-1 pre-cut pole tabs to obtain the pole piece distance between the nth pre-cut pole tab and the n-1th pre-cut pole tab; According to the pole piece distance between the nth pre-die-cut pole tab and the (n-1)th pre-die-cut pole tab, a target arrangement position of the nth pre-die-cut pole tab on the pole piece is determined.

8. A tab die cutting device, characterized in that: include: A data acquisition module, used for acquiring the thickness of a pole piece between two adjacent pre-cut pole ears among a plurality of pre-cut pole ears; A position determination module, used to determine the target arrangement positions of the plurality of pre-cut pole ears in the length direction of the pole sheet according to the thickness of the pole sheet between the two adjacent pre-cut pole ears; A tab die-cutting module, used for die-cutting the pole piece to form a plurality of tabs according to the target arrangement position; The position determination module is also used to obtain the pole piece thickness between the first pre-cut pole piece and the first end of the pole piece when the nth pre-cut pole piece is the first pre-cut pole piece; adjust the arrangement position of the first pre-cut pole piece on the pole piece according to the pole piece thickness to obtain the target arrangement position of the nth pre-cut pole piece, wherein n is a positive integer, and the pole piece includes the first end and the second end along the length direction, the first end is an end close to the first pre-cut pole piece in the length direction of the pole piece, and the second end is an end away from the first pre-cut pole piece in the length direction of the pole piece.

9. A readable storage medium, characterized in that: Computer program instructions are stored on the readable storage medium, and when the computer program instructions are executed by the processor, the tab die-cutting method according to any one of claims 1 to 8 is implemented.

10. A computer program product, characterized in that When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the tab die-cutting method as described in any one of claims 1 to 8.

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