Tab die-cutting method and tab die-cutting device

Abstract

The application provides a tab die-cutting method and a tab die-cuting device, and relates to the technical field of battery manufacturing. The tab die-cutting method comprises the following steps: obtaining a starting interval DB, an ending interval DE, and control coefficients K1, K2, K3,..., K t‑1 , die-cutting a tab starting end on a tab substrate, die-cutting a first tab at a position away from the tab starting end by the starting interval DB, calculating the interval between two adjacent tabs according to a tab interval calculation formula, and sequentially die-cutting corresponding tabs on the tab substrate based on the interval between the two adjacent tabs, and after the tth tab is die-cut, die-cutting the tab substrate at a position away from the tth tab by the ending interval DE to form a tab ending end. In this way, the error sources of the tab interval can be reduced, the accumulation of the tab tolerance can be reduced, and the possibility of tab misplacement can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a method and apparatus for die-cutting tabs. Background Technology

[0002] With the rapid development of the new energy power battery and energy storage battery industry, the market is placing increasingly stringent requirements on battery energy density, cycle life, and production consistency. This has led to an increase in the number of electrode layers and the number of tabs in batteries.

[0003] In the related technology, when the number of electrodes increases during the die-cutting process, the tolerance generated during the die-cutting process of each electrode also increases, which in turn increases the amount of electrode misalignment, reduces the yield, and makes the production cost higher. Summary of the Invention

[0004] This application provides a tab die-cutting method and a tab die-cutting apparatus, which can reduce the tolerance in tab die-cutting, reduce the misalignment of tabs, improve yield, and reduce production costs.

[0005] In a first aspect, this application provides a method for die-cutting electrode tabs, used to die-cut multiple electrode tabs on an electrode substrate to form an electrode. The method includes: obtaining a starting spacing DB, a finishing spacing DE, and control coefficients K1, K2, K3…K… t-1 The electrode substrate is die-cut to form the electrode starting end. The first electrode tab is die-cut at a position at a distance DB from the starting end of the electrode. The distance between two adjacent electrode tabs is calculated according to the electrode tab distance calculation formula. Based on the distance between two adjacent electrode tabs, the corresponding electrode tabs are die-cut on the electrode substrate in sequence. After the t-th electrode tab is die-cut, the electrode substrate is die-cut at a position at a distance DE from the t-th electrode tab to form the electrode end.

[0006] The formula for calculating the electrode spacing is as follows: D2=DB*K1, D3=DB*K2.

[0007] D 2n =DB*K 2n-1 * , i Take even numbers.

[0008] D 2n+1 =DB*K 2n * , i Take even numbers.

[0009] n is an integer greater than 1, D2 is the distance between the 2nd and 1st pole pieces, D3 is the distance between the 3rd and 2nd pole pieces, and the pole piece spacing D... 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D.2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

[0010] In summary, in the embodiments of this application, after obtaining the starting distance DB, the ending distance DE, and the control coefficients K1, K2, K3…Kt-1, the distance between all adjacent pairs of electrodes can be determined according to the electrode spacing calculation formula, thereby facilitating the fabrication of electrodes with multiple electrodes. Specifically, in the electrode spacing calculation formula proposed in this application, the positions of electrodes with odd-numbered orders control each other, while the positions of electrodes with even-numbered orders are controlled by the positions of electrodes with odd-numbered orders. Thus, in a plurality of electrodes, approximately half of the electrodes' positions relative to the preceding electrode do not affect the distance between the following electrode and that electrode, reducing the sources of error in electrode spacing, thereby reducing the accumulation of electrode tolerances and lowering the possibility of electrode misalignment.

[0011] Optionally, obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K t-1 This includes: obtaining the design parameters and winding parameters of the electrode sheet; determining the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent electrode tabs based on the design parameters and winding parameters; and calculating the control coefficients K1, K2, K3…K based on the theoretical gap between two adjacent electrode tabs. t-1 .

[0012] In this step, the starting gap DB, ending gap DE, and control coefficients K1, K2, K3…K are confirmed based on the electrode design parameters and winding parameters. t-1 It has good compatibility with the electrode sheet to be produced, which is beneficial for controlling the position of the electrode tab during the subsequent electrode tab die-cutting process.

[0013] Optionally, the method may further include the following steps during the process of sequentially die-cutting the tabs.

[0014] The actual distance between the tab and the starting end of the electrode sheet being die-cut can be obtained in real time.

[0015] Obtain the theoretical interval between the tab and the starting end of the electrode sheet in the current die-cutting process.

[0016] The verification results are obtained by comparing the theoretical interval with the actual interval.

[0017] If the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the spacing between the next tab and the currently die-cut tab is compensated according to the error.

[0018] Thus, this application can also provide real-time compensation during the electrode die-cutting process based on the theoretical interval between the currently die-cut tab and the starting end of the electrode sheet, and the interval between the currently die-cut tab and the starting end of the electrode sheet. Furthermore, during the compensation process, only tabs with odd-numbered sequences are compensated; tabs with even-numbered sequences are not compensated separately. This reduces the possibility of misalignment between the two tabs following the odd-numbered tab and simplifies the compensation process.

[0019] Optionally, after die-cutting the t-th electrode tab, the electrode substrate is die-cut at a position at a distance DE from the t-th electrode tab to form the electrode end. The method further includes the following steps.

[0020] The actual distance between the first tab and the starting end of the electrode is detected, as well as the actual spacing between any two adjacent tabs, to obtain the actual control coefficient K. 1. K 2. K 3…K t-1 .

[0021] The actual control coefficient is compared with the control coefficient to obtain the comparison result.

[0022] If the comparison results indicate that there is a deviation between the actual control coefficient and the control coefficient, obtain the subscript r of the actual control coefficient corresponding to the deviation.

[0023] When r is odd, the control coefficient K is kept constant. r Without changing the value of r, when r is even, adjust the control coefficient K based on the comparison results. r Make corrections.

[0024] By using the above settings, the control coefficient K for matching the tabs with odd-numbered sequences can be corrected, reducing the possibility of tab misalignment during the die-cutting process of the next electrode. Furthermore, it reduces the need for comparison and compensation of control coefficients, significantly reducing computational load and improving compensation efficiency.

[0025] Secondly, embodiments of this application also propose a tab die-cutting device, including: a parameter configuration module, a calculation module, and a die-cutting module. The parameter configuration module is used to obtain the starting gap DB, the ending gap DE, and the control coefficients K1, K2, K3…K t-1The calculation module is used to calculate the distance between two adjacent electrodes according to the electrode spacing calculation formula. The die-cutting module is used to die-cut the starting end of the electrode on the electrode substrate, die-cut the first electrode at a position at a distance DB from the starting end of the electrode, die-cut the corresponding electrodes sequentially based on the distance between two adjacent electrodes, and die-cut the end of the electrode at a position at a distance DE from the t-th electrode to form the electrode.

[0026] The formula for calculating the distance between the electrodes is as follows: D2=DB*K1, D3=DB*K2.

[0027] D 2n =DB*K 2n-1 * , i Take even numbers.

[0028] D 2n+1 =DB*K 2n * , i Take even numbers.

[0029] n is an integer greater than 1, D2 is the distance between the 2nd and 1st pole pieces, D3 is the distance between the 3rd and 2nd pole pieces, and the pole piece spacing D... 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D. 2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

[0030] Optionally, the electrode die-cutting device also includes a generation module, which is used to calculate the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent electrodes based on the electrode design parameters and winding parameters, and to calculate control coefficients K1, K2, K3…K based on the theoretical gap of the electrodes. t-1 .

[0031] Optionally, the tab die-cutting device may also include a real-time compensation module and a detection module.

[0032] The generation module is also used to obtain the theoretical interval between each tab and the starting end of the electrode.

[0033] The detection module is used to obtain the actual interval between the tab and the starting end of the electrode sheet in real time.

[0034] The real-time compensation module is used to verify the theoretical and actual intervals. When the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the module compensates for the distance between the next tab and the currently die-cut tab based on the error.

[0035] Optionally, the tab die-cutting device may also include a batch detection module and a batch compensation module.

[0036] The batch detection module is also used to obtain the actual distance between the first tab and the starting end of the electrode sheet after the die-cutting module has formed the electrode sheet by die-cutting the electrode sheet substrate, as well as the actual spacing between each pair of adjacent tabs, and to obtain the actual control coefficient K. 1. K 2. K 3…K t-1 .

[0037] The batch compensation module compares the corresponding actual control coefficient with the control coefficient to obtain the comparison result. If the comparison result indicates a deviation between the actual control coefficient and the control coefficient, it obtains the index r of the actual control coefficient corresponding to the deviation. If r is odd, it maintains the control coefficient K. r Without changing the value of r, when r is even, adjust the control coefficient K based on the comparison results. r Make corrections.

[0038] Optionally, the electrode die-cutting device may also include a conveying module for conveying electrode substrates.

[0039] The die-cutting module is used to die-cut the starting end of the electrode sheet on the electrode sheet substrate according to the conveying distance of the conveying module, to die-cut the corresponding tabs on the electrode sheet substrate according to the spacing between two adjacent tabs, and to die-cut the end of the electrode sheet on the electrode sheet substrate to form an electrode sheet.

[0040] Optionally, the conveying module includes an unwinding servo motor, a winding servo mechanism, an unwinding mechanism, and a winding mechanism.

[0041] The unwinding mechanism is driven by the unwinding servo mechanism, and the winding mechanism is driven by the winding servo mechanism. The electrode substrate is wound around the unwinding mechanism and pulled by the winding mechanism. The unwinding mechanism is used to supply and transport the electrode substrate, and the winding mechanism is used to wind the electrode. The die-cutting module is located between the unwinding mechanism and the winding mechanism.

[0042] The beneficial effects of the tab die-cutting apparatus provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0043] Figure 1 This is a flowchart of a tab die-cutting method according to an embodiment of this application.

[0044] Figure 2 This is a schematic diagram of a control mode for the tab spacing according to an embodiment of this application.

[0045] Figure 3 This is a schematic diagram showing the position of the tabs on the electrode sheet in this application.

[0046] Figure 4 This is a schematic diagram of an electrode after winding, according to an embodiment of this application.

[0047] Figure 5 This is a step diagram illustrating real-time compensation for a tab die-cutting method according to an embodiment of this application.

[0048] Figure 6 This is a schematic diagram of another electrode die-cutting method according to an embodiment of this application.

[0049] Figure 7 This is a schematic diagram of a tab die-cutting device according to an embodiment of this application.

[0050] Figure 8 This is a structural diagram of a tab die-cutting device according to an embodiment of this application.

[0051] Explanation of reference numerals in the attached figures: 10: Electrode; 11: Electrode; 20: Electrode die-cutting device; 21: Parameter configuration module; 22: Calculation module; 23: Die-cutting module; 24: Detection module; 25: Conveying module; 251: Rewinding mechanism; 252: Unwinding mechanism. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0054] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0055] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0057] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0058] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0060] Reference Figure 1 As shown, this application provides a method for die-cutting tabs, used to die-cut multiple tabs 11 on an electrode substrate to form an electrode 10, wherein the multiple tabs 11 can be die-cut sequentially. The method includes the following steps.

[0061] Step 101: Obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K t-1 .

[0062] In this step, the starting spacing DB, ending spacing DE, and control coefficients K1, K2, K3…K can be obtained based on the electrode to be manufactured. t-1 .

[0063] Wherein, the initial spacing DB represents the distance between the first electrode tab and the beginning of the electrode plate, and the final spacing DE represents the distance between the last electrode tab and the end of the electrode plate. Control coefficients K1, K2, K3…K t-1 This is related to the spacing between adjacent tabs, representing the spacing ratio between two consecutive adjacent tabs. Obtaining these parameters can provide a basis for the subsequent die-cutting process of the tabs 11.

[0064] Step 102: Die-cut the electrode substrate to form the electrode starting end.

[0065] In this step, the starting end of the electrode can be formed on the electrode substrate, defining the starting position of the electrode 10 to be processed, and providing a positional reference for the subsequent die-cutting of the electrode tab 11.

[0066] Step 103: Die-cut the first tab at a position at a distance DB from the starting end of the electrode sheet.

[0067] In this way, the position of the first electrode tab can be located by the starting end of the electrode and the starting spacing DB, so as to die-cut the first electrode tab on the electrode substrate.

[0068] In this embodiment, multiple tabs 11 are die-cut sequentially. The first tab serves as the reference and prerequisite for the die-cutting of subsequent tabs, so that other tabs 11 can be die-cut subsequently.

[0069] Step 104: Calculate the distance between two adjacent electrodes according to the electrode spacing formula, and then die-cut the corresponding electrodes on the electrode substrate according to the distance between two adjacent electrodes.

[0070] In this step, the distance between all adjacent tabs 11 can be calculated. Thus, after the previous tab 11 is die-cut, the position of the next tab 11 can be determined based on the distance between this tab 11 and the next tab 11, and then the position of the next tab 11 can be die-cut.

[0071] In this embodiment, the spacing between adjacent tabs 11 can be calculated based on the initial spacing DB and the control coefficient, according to the tab spacing calculation formula.

[0072] The formula for calculating the electrode spacing is as follows: D2=DB*K1, D3=DB*K2.

[0073] D 2n =DB*K 2n-1 * , i Take even numbers.

[0074] D 2n+1 =DB*K 2n * , i Take even numbers.

[0075] n is an integer greater than 1, D2 is the distance between the 2nd and 1st pole pieces, D3 is the distance between the 3rd and 2nd pole pieces, and the pole piece spacing D... 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D. 2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

[0076] In the above formula, ∏ represents the multiplication symbol, the superscript indicates the end value of the multiplication, and the subscript indicates the beginning value of the multiplication. For example, in In the middle, is i The initial value is 2, and so on. i Multiplying terms equal to 2n-2 is performed continuously, starting with K2 as the first term and continuing until K is reached. 2n-2 Until then. Continue with For example, when n is 5, it means K2*K4*K6*K8.

[0077] In this step, the distance between each tab and the previous tab can be calculated according to the above tab spacing formula, so that the position of each tab can be determined on the electrode substrate, and then all tabs can be die-cut accordingly.

[0078] To clarify the scheme of this application, the following explanation uses the distance between the 2nd and 1st electrodes, and the distance between the 9th and 8th electrodes as examples. To facilitate understanding the relationship and calculation rules between the distances of adjacent electrodes, a value D1 is defined. D1 represents the distance between the 1st electrode and the starting end of the electrode plate, and D1 = DB.

[0079] D2=DB*K1=D1*K1.

[0080] D3=DB*K2=D1*K2.

[0081] D4=DB*K2*K3=D3*K3.

[0082] D5 = DB * K2 * K4 = D3 * K4.

[0083] D6=DB*K2*K4*K5=D5*K5.

[0084] D7=DB*K2*K4*K6=D5*K6.

[0085] D8=DB*K2*K4*K6*K7=D7*K7.

[0086] D9=DB*K2*K4*K6*K8=D7*K8.

[0087] According to the above formula for calculating the electrode spacing, in this embodiment, the spacing between the odd-numbered electrode and the previous electrode determines the spacing between the next electrode with an even-numbered order and the corresponding previous electrode, as well as the spacing between the next electrode with an odd-numbered order and the corresponding previous electrode.

[0088] Wherein, D2 represents the distance between the second and first electrode tabs, indicating the position of the second electrode tab. D3 represents the distance between the third and second electrode tabs, indicating the position of the third electrode tab. D4 represents the distance between the fourth and second electrode tabs, indicating the position of the fourth electrode tab. And so on, D5 indicates the position of the fifth electrode tab, D6 indicates the position of the sixth electrode tab, D7 indicates the position of the seventh electrode tab, D8 indicates the position of the eighth electrode tab, and D9 indicates the position of the ninth electrode tab.

[0089] Therefore, in the electrode die-cutting method proposed in this application, the position of the odd-numbered electrode determines the positions of the next two electrodes. In this way, the positions of the odd-numbered electrodes control each other, and the positions of the even-numbered electrodes are also controlled by the positions of the odd-numbered electrodes. In other words, except for the first electrode, all electrode positions are determined solely by the positions of the odd-numbered electrodes, which reduces the accumulation of electrode tolerances and lowers the possibility of electrode misalignment.

[0090] Step 105: After die-cutting the t-th electrode tab, die-cut the electrode substrate at a position DE away from the t-th electrode tab to form the electrode end.

[0091] After die-cutting the t-th tab, all the tabs on the electrode sheet to be manufactured have been die-cut. Then, using the t-th tab as a reference, the position of the electrode end can be determined, and the electrode end can be formed by die-cutting on the electrode substrate. In this way, the manufacturing of the electrode sheet is completed on the electrode substrate, forming a complete electrode sheet.

[0092] In summary, in the embodiments of this application, after obtaining the starting distance DB, the ending distance DE, and the control coefficients K1, K2, K3…Kt-1, the distance between all adjacent pairs of electrodes can be determined according to the electrode distance calculation formula, thereby facilitating the fabrication of electrodes with multiple electrodes 11. Specifically, in the electrode distance calculation formula proposed in this application, the positions of electrodes with odd-numbered orders control each other, while the positions of electrodes with even-numbered orders are controlled by the positions of electrodes with odd-numbered orders. Thus, in the multiple electrodes 11, approximately half of the electrodes' positions relative to the preceding electrode do not affect the distance between the following electrode and that electrode, reducing the sources of error in the electrode distance, thereby reducing the accumulation of electrode tolerances and lowering the possibility of electrode misalignment.

[0093] In order to make the solution and beneficial effects of this application clearer, this application will be described in detail in conjunction with relevant technologies.

[0094] In related technologies, the logic of die-cutting tabs is a chain dependency. Specifically, the position of the first tab is the starting point. The distance between the second tab and the first tab is determined by the distance between the first tab and the starting end of the electrode sheet. The distance between the third tab and the second tab is determined by the distance between the second tab and the first tab. The distance between the fourth tab and the third tab is determined by the distance between the third tab and the second tab, and so on.

[0095] In this way, the distance between the tabs at each location is determined by the distance between the tabs at the previous location. As the number of tabs increases, the tolerance of each tab accumulates, resulting in a larger amount of tab misalignment, which reduces the yield of the electrode and increases production costs.

[0096] In this application, the distance between the odd-numbered electrode and the previous electrode is used to determine the distance between the next electrode with an even-numbered order and its corresponding previous electrode, and the distance between the next electrode with an odd-numbered order and its corresponding previous electrode, as shown below. Figure 2 As shown. This forms a two-level control mode of "baseline → critical node → subsequent node", breaking the traditional chain dependency of "the next electrode spacing is controlled by the previous electrode spacing", avoiding error accumulation from the root, reducing the misalignment of electrode 11 during the winding process, and facilitating the formation of electrode sheets 10 with better electrode alignment, such as... Figure 3 As shown.

[0097] It should be noted that the electrode tab die-cutting method proposed in this application can be used to die-cut electrode sheets 10 with electrode tabs 11 on both sides, such as... Figure 4 As shown, this method is better suited to the rapid development of the current new energy power battery and energy storage battery industry. Of course, the tab die-cutting method proposed in this application can also be used to die-cut electrode sheets 10 with tabs 11 on one side.

[0098] In some embodiments, step 101 involves obtaining the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K. t-1 Specifically, it includes the following steps.

[0099] Obtain the design and winding parameters of the electrode sheet. Based on these parameters, determine the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent electrode tabs. Calculate the control coefficients K1, K2, K3…K based on the theoretical gap between two adjacent electrode tabs. t-1 .

[0100] The design parameters and winding parameters of electrode 10 can be determined during the development stage of the secondary battery on which electrode 10 is mounted. These parameters are then used to determine and obtain the starting gap DB, ending gap DE, and control coefficients K1, K2, K3…K. t-1 The theoretical basis.

[0101] Specifically, the design parameters of the electrode 10 may include the inherent structural dimensions of the electrode 10, such as the overall length of the electrode 10, the number of tabs 11, and the length of the tabs 11. The winding parameters of the electrode 10 are the operating process conditions of the winding equipment when winding the electrode, such as the diameter of the winding needle, the number of winding layers, the winding alignment tolerance, and the winding stretching length.

[0102] After obtaining the design parameters and winding parameters of the electrode 10, the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent tabs 11 can be determined accordingly.

[0103] There are several ways to determine the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent tabs 11. For example, design parameters and winding parameters can be input into a computational model, and the appropriate starting gap DB, ending gap DE, and theoretical gap between adjacent tabs 11 can be obtained through the computational model. Specifically, the computational model can be a model that can generate a simulated structure of the electrode 10 after winding according to the winding parameters and design parameters, and determine the position of each tab 11 based on the simulated structure.

[0104] Alternatively, the operator can manually calculate DB, DE, and the theoretical spacing between adjacent tabs 11 based on the electrode design parameters and winding parameters, and then enter the calculated values ​​into the system. Then, during the actual die-cutting of the tabs 11, the operator retrieves the corresponding DB, DE, and the theoretical spacing between adjacent tabs 11 from the system based on the electrode design parameters and winding parameters.

[0105] The specific methods for determining the starting distance DB, the ending distance DE, and the theoretical distance between two adjacent tabs 11 are not specifically limited in this embodiment.

[0106] After obtaining the theoretical spacing between two adjacent tabs 11, the control coefficients K1, K2, K3…K can be determined based on the initial spacing DB and the theoretical spacing between two adjacent tabs 11. t-1 For example, specifically, one can calculate the ratio of D9 to D7 and then calculate K8, or calculate the ratio of D9 to D8 and then calculate K7, and so on.

[0107] In this step, the starting gap DB, ending gap DE, and control coefficients K1, K2, K3…K are confirmed based on the design parameters and winding parameters of electrode 10. t-1 It has good compatibility with the electrode sheet 10 to be produced, which is beneficial for controlling the position of the electrode tab 11 during the subsequent electrode tab die-cutting process.

[0108] In some embodiments, during the process of sequentially die-cutting out the tabs, the method further includes the following steps, such as... Figure 5 As shown.

[0109] Step 501: Obtain the actual interval between the currently die-cut tab and the starting end of the electrode sheet in real time.

[0110] In this step, each electrode tab 11 is die-cut, and the actual distance between the electrode tab 11 and the starting end of the electrode sheet can be obtained in real time. This reflects the actual die-cut position of the electrode tab 11 and can be used as a basis for judging whether there is an error in the die-cutting of the electrode tab 11.

[0111] Specifically, during each die-cutting operation, the actual interval between the currently die-cut tab 11 and the starting end of the electrode sheet can be directly detected. Alternatively, the interval between the currently die-cut tab and the previous tab can be detected in real time during each die-cutting operation. Then, the intervals between each tab and the previous tab are accumulated, and combined with the interval between the first tab and the starting end of the electrode sheet, the actual interval between the currently die-cut tab and the starting end of the electrode sheet is obtained.

[0112] Step 502: Obtain the theoretical interval between the currently die-cut tab and the starting end of the electrode sheet.

[0113] In this step, the theoretical interval between the current die-cut tab and the starting end of the electrode sheet can be determined. This reflects the theoretical position of each tab, which is a standard position with precise numerical values ​​without dimensional tolerances, and is also the expected actual forming position of the tab during the die-cutting process.

[0114] Step 503: Verify the theoretical interval and the actual interval to obtain the verification result.

[0115] In step 503, the actual interval obtained in step 501 can be verified with the theoretical interval obtained in step 502 to determine whether the actual die-cut position of the current die-cut tab is consistent with the theoretical position, which can be used as a reference for subsequent compensation of the tab die-cutting.

[0116] Step 504: When the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the spacing between the next tab and the currently die-cut tab is compensated according to the error.

[0117] If the verification result indicates an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, it means that the currently die-cut tab is misaligned. In this case, the order of the currently die-cut tabs can be determined. If the tab order is even, the spacing between the next tab and the currently die-cut tab can be compensated.

[0118] In the above process, if the even-numbered tabs are misaligned, the error corresponding to the interval between the even-numbered tabs and the starting end of the electrode sheet can be compensated in the die-cutting of the next tab, thereby reducing the misalignment of the tabs in odd order.

[0119] For example, during the die-cutting of the 6th tab, errors resulted in a smaller actual distance between the 6th tab and the starting end of the electrode sheet, causing the 6th tab to be positioned further forward than theoretically. Subsequently, during the die-cutting of the 7th tab, the distance between it and the 6th tab can be determined by D7=DB*K2*K4*K6, and then the error of the 6th tab can be added to make the position of the 7th tab closer to its theoretical position. Therefore, the actual positions of the 8th and 9th tabs, determined based on the position of the 7th tab, will also have smaller deviations from their theoretical positions.

[0120] When the current die-cutting tab order is odd, for example, the current die-cutting tab is the 9th tab, and the detection shows that the initial distance between the 9th tab and the electrode sheet is small, causing the 9th tab to be positioned earlier than the theoretical distance, then when die-cutting the 10th tab, D, determined by the tab spacing calculation formula, is still used. 10 And taking the 9th pole as the reference, combined with D 10 Die-cut the 10th tab. This way, the 10th tab will be positioned relatively forward.

[0121] Subsequently, the actual interval between the 10th tab and the starting end of the electrode can be detected, and it can be determined that there is an error in the actual interval between the 10th tab and the starting end of the electrode. Compensation is then performed when die-cutting the 11th tab.

[0122] That is, in this embodiment of the application, real-time compensation can also be provided during the electrode die-cutting process based on the theoretical interval between the currently die-cut tab and the starting end of the electrode sheet, and the interval between the currently die-cut tab and the starting end of the electrode sheet. Furthermore, during the compensation process, only tabs with odd-numbered sequences are compensated, while tabs with even-numbered sequences are not compensated separately. This reduces the possibility of misalignment between the two tabs following the odd-numbered tabs and simplifies the compensation process.

[0123] It is understandable that when die-cutting tabs to form electrode sheets 10, it is usually done in batches, that is, within a certain period of time, the die-cutting of tabs 11 on multiple electrode sheets 10 with the same design parameters and winding parameters is completed in batches. In the embodiments of this application, after the die-cutting of all tabs 11 on the electrode sheet 10 is completed, the entire electrode sheet 10 can be inspected and the control coefficient can be corrected to reduce the possibility of tab misalignment during the subsequent die-cutting process of the electrode sheets 10.

[0124] Specifically, such as Figure 6 As shown, this application also provides a method for die-cutting tabs, which further includes the following steps.

[0125] Step 601: Obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K t-1 .

[0126] Step 602: Die-cut the electrode substrate to form the electrode starting end.

[0127] Step 603: Die-cut the first tab at a position at a distance DB from the starting end of the electrode sheet.

[0128] Step 604: Calculate the distance between two adjacent electrodes according to the electrode spacing formula, and die-cut the corresponding electrodes on the electrode substrate according to the distance between two adjacent electrodes.

[0129] Step 605: After die-cutting the t-th electrode tab, die-cut the electrode substrate at a position DE away from the t-th electrode tab to form the electrode end.

[0130] For a detailed explanation of steps 601, 602, 603, 604 and 605, please refer to the foregoing explanation of steps 101, 150, 150, 104 and 105. The embodiments of this application will not be repeated here.

[0131] Step 606: Detect the actual distance between the first tab and the starting end of the electrode, and the actual spacing between any two adjacent tabs, to obtain the actual control coefficient K. 1. K 2. K 3…K t-1 .

[0132] In this way, after all the tabs 11 in the current electrode sheet 10 have been die-cut, the actual distance between the first tab and the starting end of the electrode sheet, as well as the actual spacing between every two adjacent tabs 11, can be detected. Then, the actual control coefficient K can be derived from the calculated tab spacing value. 2. K 3…K t-1 Calculate the ratio between the actual distance between the second electrode tab and the first electrode tab, and the actual distance between the first electrode tab and the starting end of the electrode plate, to obtain the actual control coefficient K. 1.

[0133] Step 607: Compare the corresponding actual control coefficient with the control coefficient to obtain the comparison result.

[0134] The control coefficient is determined under an ideal, tolerance-free condition, while the actual control coefficient is obtained from the measured spacing of the on-site simulation. The actual control coefficient reflects the current proportion of the actual deviation transmission of the die-cutting device. This step compares the corresponding actual control coefficient with the control coefficient to intuitively quantify the magnitude of the deviation transmission, providing a reference for subsequent compensation.

[0135] The corresponding actual control coefficient and control coefficient refer to the actual control coefficient and control coefficient matched with the same electrode.

[0136] For example, K is calculated from the actual distance between the fourth and third electrodes, and the actual distance between the third and second electrodes. 3. Matching the fourth electrode, this is the actual control coefficient used to determine the position of the fourth electrode. The corresponding control coefficient is K3, which is the actual control coefficient used to determine the theoretical position of the fourth electrode. This is reflected in K... 1. K 2. K 3…K t-1 With K1, K2, K3…K t-1 In the middle, the K values ​​with the same subscript are corresponding.

[0137] Step 608: If the comparison result indicates a deviation between the actual control coefficient and the control coefficient, obtain the index r of the actual control coefficient corresponding to the deviation. If r is odd, maintain the control coefficient K. r Without changing the value of r, when r is even, adjust the control coefficient K based on the comparison results. r Make corrections.

[0138] When the comparison result indicates a deviation between a certain set of actual control coefficients and the control coefficients, it means that the position of the tab 11 that matches the actual control coefficients is misaligned. At this time, the control coefficients can be corrected according to the deviation to adapt to the current actual deviation transmission ratio of the die-cutting device, thereby reducing the possibility of tab 11 misalignment during the die-cutting process of the next electrode 10.

[0139] Specifically, it can be determined whether the subscript r of the actual control coefficient is odd or even. When r is even, the order of the corresponding poles is odd. In this case, for K... r Make corrections. When r is odd, and the matching pole order is even, then keep K. r The control coefficient remains unchanged, meaning it is not modified for matching with poles of even order.

[0140] In this application, the control coefficients matched with even-numbered tabs 11 are not included in the subsequent calculation of tab spacing, and therefore do not affect the subsequent calculation of tab spacing. In this step, only the control coefficients K matched with odd-numbered tabs are corrected, which can reduce the comparison and compensation of control coefficients, significantly reduce the amount of calculation, and improve the compensation efficiency.

[0141] Steps 501 to 503 involve real-time compensation during the tab die-cutting process, while steps 506 to 608 involve detection performed after the electrode 10 is manufactured. This detection is intended to compensate for the subsequent tab die-cutting in the electrode 10. It can be understood that these two types of compensation are non-conflicting and work in synergy, respectively correcting dynamic random errors and batch systematic errors, thereby jointly improving the forming accuracy of the tab 11.

[0142] In summary, in this embodiment, the spacing between all adjacent tabs 11 is determined according to the tab spacing calculation formula, which facilitates the fabrication of an electrode sheet with multiple tabs 11. Furthermore, in the multiple tabs 11, approximately half of the tabs 11 do not affect the spacing between the preceding tab and the following tab, reducing the sources of error in the tab spacing, thereby reducing the accumulation of tab tolerances and lowering the possibility of tab misalignment.

[0143] The tab die-cutting method provided in this application can be executed by a tab die-cutting device 20. This application uses the tab die-cutting device 20 as an example to illustrate the tab die-cutting device 20 provided in this application.

[0144] like Figure 7 As shown in the embodiment of this application, a tab die-cutting device 20 is also proposed, including a parameter configuration module 21, a calculation module 22 and a die-cutting module 23.

[0145] Among them, the parameter configuration module 21 is used to obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K t-1 .

[0146] The calculation module 22 is used to calculate the distance between two adjacent electrodes 11 according to the electrode spacing calculation formula.

[0147] The die-cutting module 23 is used to die-cut the starting end of the electrode on the electrode substrate, to die-cut the first electrode tab at a position at a distance DB from the starting end of the electrode, to die-cut the corresponding electrode tabs 11 sequentially based on the distance between two adjacent electrode tabs 11, and to die-cut the end of the electrode at a position at a distance DE from the t-th electrode tab to form the electrode 10.

[0148] The formula for calculating the electrode spacing is as follows: D2=DB*K1, D3=DB*K2.

[0149] D 2n =DB*K 2n-1 * , i Take even numbers.

[0150] D 2n+1 =DB*K 2n * , i Take even numbers.

[0151] n is an integer greater than 1, D2 is the distance between the 2nd and 1st pole pieces, D3 is the distance between the 3rd and 2nd pole pieces, and the pole piece spacing D... 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D. 2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

[0152] Optionally, the electrode die-cutting device also includes a generation module. The generation module is used to calculate the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent electrodes based on the electrode design parameters and winding parameters, and to determine control coefficients K1, K2, K3…K based on the theoretical electrode gap. t-1 .

[0153] Optionally, the electrode die-cutting device 20 further includes a real-time compensation module and a detection module 24. In this embodiment, the generation module is also used to obtain the theoretical interval between each electrode tab and the starting end of the electrode sheet.

[0154] The detection module 24 is used to obtain the actual interval between the tab and the starting end of the electrode sheet in real time.

[0155] The real-time compensation module is used to verify the theoretical interval and the actual interval to obtain the verification result. When the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the spacing between the next tab and the currently die-cut tab is compensated according to the error.

[0156] Optionally, the tab die-cutting device 20 may also include a batch detection module and a batch compensation module.

[0157] The batch detection module is also used to obtain the actual distance between the first tab and the starting end of the electrode sheet after the die-cutting module 23 has die-cut the electrode sheet substrate to form the electrode sheet 10, as well as the actual spacing between each pair of adjacent tabs, and to obtain the actual control coefficient K. 1. K 2. K 3…K t-1 .

[0158] The batch compensation module compares the corresponding actual control coefficient with the control coefficient to obtain the comparison result. If the comparison result indicates a deviation between the actual control coefficient and the control coefficient, it obtains the index r of the actual control coefficient corresponding to the deviation. If r is odd, the control coefficient Kr remains unchanged; if r is even, the control coefficient Kr is corrected based on the comparison result.

[0159] The tab die-cutting device 20 provided in this application embodiment can achieve the following: Figure 1 , Figure 3 and Figure 4 To avoid repetition, the various processes in the method embodiments described herein will not be repeated here.

[0160] In some embodiments, the electrode tab die-cutting apparatus 20 further includes a conveying module 25 for conveying the electrode substrate. The die-cutting module 23 is used to die-cut the starting end of the electrode on the electrode substrate according to the conveying distance of the conveying module 25, to die-cut the corresponding electrode tab 11 on the electrode substrate sequentially based on the spacing between two adjacent electrode tabs, and to die-cut the end of the electrode on the electrode substrate to form the electrode 10.

[0161] In this embodiment, the conveying module 25 can convey the electrode substrate to continuously and smoothly convey different positions on the electrode substrate to the die-cutting station, so that the die-cutting module 23 can die-cut the tab 11 at the position of the part of the electrode substrate opposite to it, and perform die-cutting to form the electrode start end and the electrode end.

[0162] That is, the electrode tab die-cutting method in this application is applicable to the dynamic feeding condition of electrode substrate. In this case, the starting distance DB, the ending distance DE, and the distance between two adjacent electrode tabs 11 can be determined by the conveying length. Specifically, during the continuous conveying of the electrode substrate, the conveying length can be obtained, and when the conveying length meets the requirements, the die-cutting module 23 can be controlled to perform die-cutting.

[0163] For example, the calculation module 22 calculates D2 to be 154.00 mm and D3 to be 289.76 mm. After the first tab is die-cut, the third tab can be die-cut when the conveying distance between the conveying module 25 and the electrode substrate reaches 154.00 mm. After the third tab is die-cut, the fourth tab can be die-cut when the conveying distance between the conveying module 25 and the electrode substrate reaches 289.76 mm, and so on.

[0164] In the above-mentioned configuration of this application, the electrode tab 11 can be die-cut under dynamic material feeding conditions of the electrode substrate, reducing the tedious process of frequent loading and unloading and repositioning, and improving processing capacity.

[0165] Among them, such as Figure 8 As shown, the conveying module 25 may specifically include an unwinding servo motor, a winding servo mechanism, an unwinding mechanism 252, and a winding mechanism 251. The unwinding mechanism 252 is drivenly connected to the unwinding servo mechanism, and the winding mechanism 251 is drivenly connected to the winding servo mechanism. The electrode substrate is wound around the unwinding mechanism 252 and pulled by the winding mechanism 251. The unwinding mechanism 252 is used to supply and convey the electrode substrate, and the winding mechanism 251 is used to wind the electrode. The die-cutting module 23 is disposed between the unwinding mechanism 252 and the winding mechanism 251.

[0166] In the above configuration, one end of the electrode substrate can be connected to the unwinding mechanism 252, and the middle portion of the electrode substrate is wound around the unwinding mechanism 252. The other end of the electrode substrate can be connected to the winding mechanism 251. Thus, when the winding mechanism 251 rotates, the winding mechanism 251 can pull the portion of the electrode substrate wound on the unwinding mechanism 252 through the other end of the electrode substrate, thereby completing the conveying of the electrode substrate.

[0167] The electrode substrate wound on the unwinding mechanism 252 is the electrode substrate without die-cut tabs, while the electrode substrate wound on the winding mechanism 251 is the electrode formed after die-cut tabs.

[0168] In this application, the unwinding servo motor and the unwinding mechanism 252 are connected by a transmission, and the winding servo motor and the winding mechanism 251 are connected by a transmission. This allows the unwinding servo motor to control the movement of the unwinding mechanism 252 at a set speed, and the winding servo motor to control the movement of the winding mechanism 251 at a set speed. During this process, the actual conveying stroke of the electrode substrate can be calculated from the encoder rotation pulses in the winding servo motor and / or the encoder ratchet rotation pulses in the unwinding servo motor, thereby determining the conveying distance of the electrode substrate by the conveying module 25.

[0169] In the above embodiments, multiple electrode sheets 10 can be fabricated on the electrode substrate. To ensure that the fabricated electrode sheets 10 can be continuously wound in the winding mechanism 251, they can be partially cut when die-cutting the starting or ending ends of the electrode sheets. This allows multiple fabricated electrode sheets 10 to form a continuous electrode sheet, ensuring stable tension and preventing strip breakage throughout the entire conveying process. The continuous electrode sheets can then be wound up and transported together. In subsequent processes of cell assembly, the continuous electrode sheets are cut and separated into independent single electrode sheets for use.

[0170] Furthermore, in two adjacent electrodes 10 in a continuous electrode sheet, there can be a blank space between the electrode end of one electrode 10 and the electrode start end of the other electrode 10. At this time, the electrode start end and electrode end of each electrode 10 can be die-cut separately.

[0171] Or, such as Figure 4 As shown, the end of one electrode 10 and the beginning of another electrode 10 can be at the same position. In this case, during the actual die-cutting process, the die-cutting depth at the beginning and end of the electrode can be different. For example, after the tab 11 in the previous electrode 10 is die-cut, the end of the electrode 10 can be determined by combining the last tab 11 and the end-to-end distance DE, and a shallow cut can be made at the end. Then, using this position as the beginning of the next electrode 10, a deep cut is made, and then the first tab of the next electrode 10 can be die-cut according to DB, and so on.

[0172] It is understandable that, in addition to the dynamic feeding condition of the electrode substrate mentioned above, the electrode die-cutting method proposed in this application can also be applied to the process of die-cutting tabs on a static electrode substrate. In this case, the two ends of the electrode substrate can be fixed in advance, and then the die-cutting module 23 can be controlled to die-cut the starting end of the electrode based on the starting spacing DB, die-cut multiple tabs 11 based on the spacing between two adjacent tabs, and die-cut the end of the electrode based on the ending spacing DE.

[0173] Additionally, this application also provides an electronic device, including a processor and a memory. The memory stores a program or instructions that can run on the processor. The program or instructions are executed by the processor to implement the steps of the aforementioned tab die-cutting method. The program or instructions, when executed by the processor, implement the various steps of the above-described tab die-cutting method embodiments and achieve the same technical effects; therefore, to avoid repetition, they will not be described again here.

[0174] The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, mobile internet device (MID), ultra-mobile personal computer (UMPC), or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. The embodiments of this application do not specifically limit it.

[0175] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0176] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for die-cutting electrode tabs, used to die-cut multiple electrode tabs on an electrode substrate to form an electrode sheet, characterized in that, The method includes: Obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K t-1 ; Die-cutting electrode substrate forms the starting end of the electrode; The first electrode tab is die-cut at a position at a distance DB from the starting end of the electrode sheet; The distance between two adjacent electrodes is calculated according to the electrode spacing formula, and the corresponding electrodes are die-cut on the electrode substrate in sequence based on the distance between two adjacent electrodes. After die-cutting the t-th electrode tab, the electrode substrate is die-cut at a position away from the t-th electrode tab from the end-cut distance DE to form the electrode end; The formula for calculating the electrode spacing is as follows: D2=DB*K1, D3=DB*K2; D 2n =DB*K 2n-1 * , i Take even numbers; D 2n+1 =DB*K 2n * , i Take even numbers; n is an integer greater than 1, D2 is the distance between the second electrode plate and the first electrode plate, D3 is the distance between the third electrode plate and the second electrode plate, and the electrode spacing D 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D. 2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

2. The electrode die-cutting method according to claim 1, characterized in that, The initial spacing DB, the final spacing DE, and the control coefficients K1, K2, K3…K are obtained. t-1 ,include: Obtain the design parameters and winding parameters of the electrode sheet; The starting gap DB, the ending gap DE, and the theoretical gap between two adjacent tabs are determined based on the design parameters and the winding parameters. The control coefficients K1, K2, K3…K are calculated based on the theoretical distance between two adjacent electrodes. t-1 .

3. The electrode die-cutting method according to claim 2, characterized in that, The method further includes the following steps during the sequential die-cutting of the electrode tabs: Real-time acquisition of the actual interval between the currently die-cut tab and the starting end of the electrode sheet; Obtain the theoretical interval between the currently die-cut tab and the starting end of the electrode sheet; The verification results are obtained by verifying the theoretical interval and the actual interval. When the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the spacing between the next tab and the currently die-cut tab is compensated according to the error.

4. The electrode die-cutting method according to claim 2, characterized in that, After die-cutting the t-th electrode tab, the electrode substrate is die-cut at a position away from the t-th electrode tab from the end-cut distance DE to form the electrode end. The method further includes: Obtain the actual distance between the first tab and the starting end of the electrode, and the actual spacing between any two adjacent tabs, to obtain the actual control coefficient K.

1. K 2. K 3…K t-1 ; The actual control coefficient is compared with the control coefficient to obtain the comparison result; If the comparison result indicates a deviation between the actual control coefficient and the control coefficient, obtain the index r of the actual control coefficient corresponding to the deviation; if r is odd, maintain the control coefficient K. r Without changing the value of r, when r is even, adjust the control coefficient K based on the comparison results. r Make corrections.

5. A tab die-cutting device, characterized in that, include: The parameter configuration module is used to obtain the starting spacing DB, the ending spacing DE, and the control coefficients K1, K2, K3…K. t-1 ; The calculation module is used to calculate the distance between two adjacent electrodes according to the electrode spacing formula; The die-cutting module is used to die-cut the starting end of the electrode on the electrode substrate, die-cut the first electrode tab at a position away from the starting end of the electrode from the starting distance DB, die-cut the corresponding electrode tabs sequentially based on the distance between two adjacent electrode tabs, and die-cut the end of the electrode at a position away from the ending distance DE of the t-th electrode tab to form an electrode. The formula for calculating the electrode spacing is as follows: D2=DB*K1, D3=DB*K2; D 2n =DB*K 2n-1 * , i Take even numbers; D 2n+1 =DB*K 2n * , i Take even numbers; n is an integer greater than 1, D2 is the distance between the second electrode plate and the first electrode plate, D3 is the distance between the third electrode plate and the second electrode plate, and the electrode spacing D 2n The distance between the 2nth electrode and the (2n-1)th electrode is called the electrode spacing D. 2n+1 t represents the distance between the (2n+1)th electrode and the 2nth electrode, and t represents the total number of electrodes.

6. The electrode die-cutting device according to claim 5, characterized in that, The electrode die-cutting device also includes a generation module; The generation module is used to determine the starting gap DB, the ending gap DE, and the theoretical gap between two adjacent tabs based on the design parameters and winding parameters of the electrode sheet, and to calculate control coefficients K1, K2, K3…K based on the theoretical gap of the tabs. t-1 .

7. The electrode die-cutting device according to claim 6, characterized in that, The electrode die-cutting device also includes a real-time compensation module and a detection module; The generation module is also used to obtain the theoretical interval between each tab and the starting end of the electrode sheet; The detection module is used to obtain the actual interval between the currently die-cut tab and the starting end of the electrode sheet in real time. The real-time compensation module is used to verify the theoretical interval and the actual interval to obtain the verification result. When the verification result indicates that there is an error in the actual interval between the currently die-cut tab and the starting end of the electrode sheet, and the current order of the die-cut tabs is even, the module compensates for the distance between the next tab and the currently die-cut tab according to the error.

8. The electrode die-cutting device according to claim 6, characterized in that, The electrode die-cutting device also includes a batch detection module and a batch compensation module; The batch detection module is also used to obtain the actual distance between the first tab and the starting end of the electrode sheet after the die-cutting module has formed the electrode sheet by die-cutting the electrode sheet substrate, and the actual spacing between each pair of adjacent tabs, and to obtain the actual control coefficient K.

1. K 2. K 3…K t-1 ; The batch compensation module is used to compare the corresponding actual control coefficient with the control coefficient to obtain a comparison result; if the comparison result indicates that there is a deviation between the actual control coefficient and the control coefficient, the subscript r of the actual control coefficient corresponding to the deviation is obtained; if r is an odd number, the control coefficient K is maintained. r Without changing the value of r, when r is even, adjust the control coefficient K based on the comparison results. r Make corrections.

9. The electrode die-cutting apparatus according to claim 6, characterized in that, The electrode die-cutting device further includes a conveying module, which is used to convey the electrode substrate. The die-cutting module is used to die-cut the starting end of the electrode sheet on the electrode sheet substrate according to the conveying distance of the conveying module, to die-cut the corresponding tabs on the electrode sheet substrate in sequence based on the spacing between two adjacent tabs, and to die-cut the end of the electrode sheet on the electrode sheet substrate to form an electrode sheet.

10. The electrode die-cutting apparatus according to claim 9, characterized in that, The conveying module includes: Unwinding servo motor and winding servo mechanism; The unwinding mechanism is connected to the unwinding servo mechanism via a transmission connection. The winding mechanism is connected to the winding servo mechanism via a transmission connection. The electrode substrate is wound around the unwinding mechanism and pulled by the winding mechanism. The unwinding mechanism is used to supply and transport the electrode substrate, and the winding mechanism is used to wind the electrode. The die-cutting module is disposed between the unwinding mechanism and the winding mechanism.

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