Pole lug die cutting size information confirmation method, device and battery cell cutting and winding equipment

Abstract

The application relates to a tab die cutting size information confirmation method and device, a battery cell cutting and winding equipment, a storage medium and a computer program product. The method comprises the following steps: obtaining an initial battery cell according to initial tab die cutting size information of a battery cell tab; correcting the initial tab die cutting size information according to a tab offset of the initial battery cell to obtain corrected initial tab die cutting size information; determining an increased tab area of a last layer of battery cell tabs and an increased tab area of a first layer of battery cell tabs according to the corrected initial tab die cutting size information; and correcting the corrected initial tab die cutting size information again according to the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs to obtain target tab die cutting size information. The method can improve the tab alignment accuracy of the battery cell tabs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery manufacturing, and in particular to a tab die-cutting size information confirmation method and device, a battery cell cutting and winding apparatus, a storage medium, and a computer program product. BACKGROUND

[0002] With the continuous development of human society, the demand for lithium batteries is growing rapidly. The alignment of the tab is a very important factor affecting the quality of the lithium battery.

[0003] In the traditional technology, the alignment of the tab is generally ensured by ensuring the accuracy of the thickness of the material belt in the upstream production process. However, in actual situations, during the winding process in the downstream process, the tab will still have a deviation problem due to the influence of the winding tension. Therefore, the alignment accuracy of the tab of the battery cell produced based on the traditional technology is low. SUMMARY

[0004] Therefore, it is necessary to provide a tab die-cutting information confirmation method and device, a battery cell cutting and winding apparatus, a computer readable storage medium, and a computer program product that can improve the alignment accuracy of the tab of the battery cell.

[0005] In a first aspect, the present application provides a tab die-cutting size information confirmation method. The method comprises:

[0006] obtaining an initial battery cell according to initial tab die-cutting size information of the battery cell tab;

[0007] correcting the initial tab die-cutting size information according to a tab deviation of the initial battery cell to obtain corrected initial tab die-cutting size information; the tab deviation is a tab deviation of a last layer of battery cell tab of the initial battery cell relative to a first layer of battery cell tab of the initial battery cell;

[0008] determining an increased tab area of the last layer of battery cell tab and an increased tab area of the first layer of battery cell tab according to the corrected initial tab die-cutting size information;

[0009] correcting the corrected initial tab die-cutting size information again according to the increased tab area of the last layer of battery cell tab and the increased tab area of the first layer of battery cell tab to obtain target tab die-cutting size information.

[0010] In one of the embodiments, before obtaining an initial battery cell according to initial tab die-cutting size information of the battery cell tab, the method further comprises:

[0011] Obtain initial area information and preset distribution information corresponding to the initial battery cell; the initial area information is used to characterize the area of ​​the battery cell tabs of the initial battery cell, and the preset distribution information is used to characterize the distribution of the battery cell tabs of the initial battery cell.

[0012] Based on the initial area information and the preset distribution information, the initial die-cutting size information of the battery cell tab is confirmed.

[0013] In one embodiment, before correcting the initial die-cutting size information based on the initial cell tab offset to obtain the corrected initial die-cutting size information, the method further includes:

[0014] The center lines of the tabs of each layer of the initial battery cell are identified to obtain the tab offset of the initial battery cell; the tab offset includes the offset between the center lines of the tabs of each layer of the initial battery cell.

[0015] The step of correcting the initial die-cutting size information based on the initial electrode offset of the battery cell to obtain the corrected initial die-cutting size information includes:

[0016] From the tab offset of the initial cell, the tab offset between the last cell tab and the first cell tab is identified and used as a reference offset;

[0017] Based on the relationship between the reference offset and the number of winding layers of the initial cell, the initial die-cutting size information is corrected to obtain the corrected initial die-cutting size information.

[0018] In one embodiment, the step of further revising the modified initial die-cutting size information based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells includes:

[0019] Obtain the area difference information between the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells;

[0020] Based on the relationship between the area difference information and the number of winding layers of the initial cell, the corrected initial die-cutting size information is adjusted again.

[0021] In one embodiment, determining the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells based on the corrected initial die-cutting size information includes:

[0022] Obtain the preset area information of the battery cell tabs in each layer;

[0023] increase the tab area of each layer of the cell tab based on the corrected initial die-cut size information and the preset area information, to obtain an increased tab area of each layer of the cell tab;

[0024] Among the increased tab area of each layer of the cell tab, the increased tab area of the last layer of the cell tab and the increased tab area of the first layer of the cell tab are identified.

[0025] In one embodiment, the increasing of the tab area of each layer of the cell tab based on the corrected initial die-cut size information and the preset area information comprises:

[0026] obtaining fan angle information corresponding to the preset area information of each layer of the cell tab, and cell radius information corresponding to each layer of the cell tab;

[0027] confirming the tab area to be increased for each layer of the cell tab according to the fan angle information and the cell radius information;

[0028] updating the tab area of each layer of the cell tab according to the tab area to be increased for each layer of the cell tab.

[0029] In a second aspect, the application further provides a device for confirming tab die-cut size information. The device comprises:

[0030] a cell production module configured to obtain an initial cell according to initial die-cut size information of a cell tab;

[0031] a first correction module configured to correct the initial die-cut size information according to a tab offset of the initial cell to obtain corrected initial die-cut size information; the tab offset is a tab offset of a last layer of the cell tab of the initial cell relative to a first layer of the cell tab of the initial cell;

[0032] an area increasing module configured to determine an increased tab area of the last layer of the cell tab and an increased tab area of the first layer of the cell tab according to the corrected initial die-cut size information;

[0033] a second correction module configured to correct the corrected initial die-cut size information again according to the increased tab area of the last layer of the cell tab and the increased tab area of the first layer of the cell tab to obtain target die-cut size information.

[0034] In a third aspect, the application further provides a cell cutting and winding device. The cell cutting and winding device comprises a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0035] obtaining an initial battery cell according to the initial die-cut size information of the battery cell tab;

[0036] correcting the initial die-cut size information according to a tab offset of the initial battery cell, to obtain corrected initial die-cut size information; the tab offset is a tab offset of a last layer battery cell tab of the initial battery cell relative to a first layer battery cell tab of the initial battery cell;

[0037] determining an increased tab area of the last layer battery cell tab and an increased tab area of the first layer battery cell tab according to the corrected initial die-cut size information;

[0038] correcting the corrected initial die-cut size information again according to the increased tab area of the last layer battery cell tab and the increased tab area of the first layer battery cell tab, to obtain target die-cut size information.

[0039] In a fourth aspect, the present application further provides a computer readable storage medium. The computer readable storage medium has a computer program stored thereon, and the computer program is executed by a processor to implement the following steps:

[0040] obtaining an initial battery cell according to the initial die-cut size information of the battery cell tab;

[0041] correcting the initial die-cut size information according to a tab offset of the initial battery cell, to obtain corrected initial die-cut size information; the tab offset is a tab offset of a last layer battery cell tab of the initial battery cell relative to a first layer battery cell tab of the initial battery cell;

[0042] determining an increased tab area of the last layer battery cell tab and an increased tab area of the first layer battery cell tab according to the corrected initial die-cut size information;

[0043] correcting the corrected initial die-cut size information again according to the increased tab area of the last layer battery cell tab and the increased tab area of the first layer battery cell tab, to obtain target die-cut size information.

[0044] In a fifth aspect, the present application further provides a computer program product. The computer program product comprises a computer program, and the computer program is executed by a processor to implement the following steps:

[0045] obtaining an initial battery cell according to the initial die-cut size information of the battery cell tab;

[0046] According to the tab offset of the initial battery cell, the initial die cutting size information is corrected to obtain corrected initial die cutting size information; the tab offset is the tab offset of the last layer of battery cell tabs relative to the first layer of battery cell tabs of the initial battery cell;

[0047] According to the corrected initial die cutting size information, the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs are determined;

[0048] According to the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs, the corrected initial die cutting size information is corrected again to obtain target die cutting size information.

[0049] The above-mentioned tab die cutting size information confirmation method, device, battery cell cutting and winding equipment, storage medium and computer program product first obtain an initial battery cell according to the initial die cutting size information of the battery cell tabs; then correct the initial die cutting size information according to the tab offset of the initial battery cell to obtain corrected initial die cutting size information; then determine the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs according to the corrected initial die cutting size information; and finally correct the corrected initial die cutting size information again according to the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs to obtain target die cutting size information. In this way, the initial die cutting size information is corrected for the first time according to the tab offset of the initial battery cell, which can adjust the alignment of the tabs to meet the requirements; and the initial die cutting size information is corrected for the second time according to the increased tab area of the last layer of battery cell tabs and the first layer of tabs, which can make the tab area meet the preset requirements, thereby obtaining the target die cutting size information. The above-mentioned target die cutting size information confirmation process starts from the winding process affected by tension twice, and the die cutting size information is corrected twice. The battery cell produced according to the target die cutting size information can overcome the influence of tension in the winding process, meet the preset tab area requirements, and also meet the alignment requirements of the tabs, thereby improving the tab alignment accuracy of the battery cell tabs. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a flowchart of the tab die cutting size information confirmation method in one embodiment;

[0051] Figure 2 It is a schematic diagram of the ideal tab distribution of the initial battery cell in one embodiment;

[0052] Figure 3 It is a schematic diagram of the actual tab distribution of the initial battery cell in one embodiment;

[0053] Figure 4 A schematic diagram of a tab material belt in an embodiment;

[0054] Figure 5 A schematic diagram of a battery cell meeting a preset tab area in an embodiment;

[0055] Figure 6 A schematic diagram of a comparison between initial die cutting size information and target die cutting size information in an embodiment;

[0056] Figure 7 A schematic diagram of a flow of a tab die cutting size information confirmation method in another embodiment;

[0057] Figure 8 A process flow diagram of a method of adjusting the alignment of same-side cylindrical tabs by adjusting the slope of the die cutting size in an embodiment;

[0058] Figure 9 A structural block diagram of a tab die cutting size information confirmation device in an embodiment;

[0059] Figure 10 An internal structural diagram of a battery cell cutting and winding device in another embodiment. DETAILED DESCRIPTION

[0060] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0061] In an exemplary embodiment, as shown in Figure 1 A tab die cutting size information confirmation method is provided, and the present embodiment illustrates the application of the method to a server corresponding to a battery cell cutting and winding device. It should be understood that the method can also be applied to a terminal corresponding to the cutting and winding device, and can also be applied to a system including the server and the terminal, and is realized through the interaction between the server and the terminal. In the present embodiment, the application of the method to the alignment adjustment of same-side tabs of cylindrical battery cells is illustrated, and the method includes the following steps:

[0062] Step S102: obtaining an initial battery cell according to initial die cutting size information of battery cell tabs.

[0063] The battery cell tab refers to a metal conductor that leads the positive and negative electrodes out of the battery cell, and is divided into a positive tab and a negative tab. The initial die cutting size information is used to represent the relationship between the initial die cutting sizes of the battery cell tabs, and specifically can be the slope relationship of each initial die cutting size. According to the slope relationship of the initial die cutting size, cutting is performed on the material belt to obtain a tab material belt of the battery cell tab.

[0064] It should be noted that, as Figure 2 The ideal tab distribution diagram of the initial battery cell is shown in the figure, and the initial die cutting size information will make the width of the tab of each layer of the initial battery cell consistent, and the positive and negative tabs of each layer are uniformly distributed.

[0065] Specifically, the server determines the initial die cutting size of each layer of the battery cell tab according to the same arc length of each layer of the battery cell tab, thereby determining the initial die cutting size information representing the initial die cutting size slope; then cuts the tape according to the initial die cutting size information to obtain the positive electrode tape, the negative electrode tape and the separator tape; Finally, according to the order of the separator tape, the negative electrode tape, the separator tape and the positive electrode tape, the initial battery cell is obtained.

[0066] It should be noted that, in the ideal case, that is, the tab does not shift, the ideal tab distribution of the initial battery cell obtained according to the initial die cutting size information should be as Figure 2 But in the actual winding process, the tape will deform due to the tension, resulting in the alignment of the battery cell tabs shifting, so the actual tab distribution of the initial battery cell is as Figure 3 .

[0067] For example, referring to the tab tape diagram in Figure 4 The server first obtains the first initial die cutting size, the second initial die cutting size and the third initial die cutting size of the tab tape; then determines the initial die cutting size information according to the slope between the three initial die cutting sizes; then cuts the tape according to the initial die cutting size information to obtain the tab tape of the initial battery cell; and then winds the tab tape to obtain the initial battery cell as Figure 3 .

[0068] Step S104, according to the tab offset of the initial battery cell, the initial die cutting size information is corrected to obtain the corrected initial die cutting size information.

[0069] The tab offset is the tab offset of the last layer of the battery cell tab relative to the first layer of the battery cell tab of the initial battery cell; the corrected initial die cutting size information is used to represent the slope relationship between the die cutting sizes after the actual winding of the battery cell while maintaining the alignment of the tabs, so the corrected initial die cutting size information will make the tab distribution of the initial battery cell consistent with the ideal case of Figure 2 .

[0070] Specifically, the server first detects the tab distribution of the initial battery cell, then identifies the tab offset of the last layer of battery cell tabs relative to the first layer of battery cell tabs from the tab distribution; and inputs the tab offset of the last layer of battery cell tabs relative to the first layer of battery cell tabs into the first correction model, which is used to determine the first correction amount for the initial die cutting size information, and corrects the initial die cutting size information based on the first correction amount. The first correction model is a deep learning model obtained by training multiple times based on historical correction experience, which can determine the correction amount for the initial die cutting size according to the tab offset.

[0071] For example, the server detects the tab distribution of the initial battery cell, then identifies the tab offset of the last layer of battery cell tabs relative to the first layer of battery cell tabs from the tab distribution; and according to the tab offset of the last layer of battery cell tabs relative to the first layer of battery cell tabs, obtains the first correction amount for correcting the initial die cutting size information through the first correction model, and corrects the initial die cutting size information according to the first correction amount, outputs the initial die cutting size information that can compensate for the tab offset and make the tab distribution of the initial battery cell conform to the ideal situation as shown in FIG. 8, as the corrected initial die cutting size information. Figure 2

[0072] Step S106, according to the corrected initial die cutting size information, determine the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs.

[0073] Wherein, the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs refer to the tab area obtained by adjusting the area of each layer of battery cell tabs according to the preset tab area on the basis of the corrected initial die cutting size information; the preset tab area refers to the area of each layer of tabs preset according to process requirements, Figure 5 A battery cell schematic diagram to meet the preset tab area.

[0074] It should be noted that since the material belt will be stretched during winding, the actual tab area after winding has changed compared to the tab area corresponding to the initial die cutting size information in step S102; therefore, the increase in the tab area is not simply a process of calculating the difference between the preset tab area and the tab area corresponding to the initial die cutting size information, but a process involving a large amount of machine detection, machine recognition and machine learning, which will not be expanded here.

[0075] Specifically, the server adjusts the tab area of the initial battery cell to Figure 5 ​As shown, the area of ​​the initial cell after adjustment is detected, and the area of ​​the last cell tab after the increase and the area of ​​the first cell tab after the increase are identified from the detection results.

[0076] For example, after the server corrects the initial die-cutting dimensions for the first time, it is able to ensure that the initial electrode distribution of the battery cell is as follows: Figure 2 As shown; however, in actual production, there are preset requirements for the width of each layer of battery cell tabs, so it is also necessary to adjust the area of ​​each layer of battery cell tabs. The tab distribution after area adjustment not only meets the preset tab area requirements but also ensures tab alignment. Therefore, the server needs to use a machine to detect the initial battery cell after area adjustment, obtain the area detection results, and determine the increased area of ​​the last layer of battery cell tabs and the increased area of ​​the first layer of tabs from the area detection results.

[0077] Step S108: Based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells, the modified initial die-cutting size information is further modified to obtain the target die-cutting size information.

[0078] Among them, the target die-cutting size information is used to characterize, for example... Figure 5 The relationship between the die-cutting dimensions of the battery cell tabs, which satisfy both the tab alignment requirements and the preset tab area, can be specifically described as follows: Figure 5 The slopes between various die-cut dimensions corresponding to the tab distribution shown are illustrated. By cutting and winding the strip according to the target die-cut size information, the tab distribution can be obtained as shown below. Figure 5 The battery cell shown.

[0079] Specifically, the server inputs the increased area of ​​the last layer of battery tabs and the increased area of ​​the first layer of battery tabs into the second correction model. This second correction model is used to confirm the second correction amount corresponding to the corrected initial die-cutting size information, and then further corrects the initial die-cutting size information based on this second correction amount. Similar to the first correction model, the second correction model is a deep learning model trained multiple times based on historical correction experience. It can determine the correction amount for the corrected initial die-cutting size according to the change in tab area.

[0080] For example, based on the increased area of ​​the last layer of battery cell tabs and the increased area of ​​the first layer of battery cell tabs, the server determines a second correction amount that needs to be adjusted in the initial die-cutting size information using a second correction model. Then, based on this second correction amount, the server further adjusts the initial die-cutting size information, outputting target die-cutting size information that satisfies both tab alignment requirements and preset area requirements. Figure 6As shown, the initial die cutting size slope represented by the initial die cutting size information is compared with the target die cutting size slope represented by the target die cutting size information.

[0081] It should be noted that by winding the material belt cut according to the target die cutting size information, an ideal distribution of the cell tabs can be obtained as shown, which meets both the tab area requirement and the tab alignment requirement. Figure 5

[0082] In the above method for confirming the tab die cutting size information, the server first obtains an initial cell according to the initial die cutting size information of the cell tabs; then modifies the initial die cutting size information according to the tab offset of the initial cell to obtain modified initial die cutting size information; then determines the increased tab area of the cell tabs of the last layer and the increased tab area of the cell tabs of the first layer according to the modified initial die cutting size information; and finally modifies the modified initial die cutting size information again according to the increased tab area of the cell tabs of the last layer and the increased tab area of the cell tabs of the first layer to obtain target die cutting size information. In this way, the server adjusts the first modification of the initial die cutting size information through the tab offset of the initial cell, which can adjust the alignment of the tabs; and the second modification of the initial die cutting size information through the increased tab area of the cell tabs of the last layer and the first layer, which can make the tab area meet the preset requirement, so as to obtain the target die cutting size information. In the above confirmation process of the target die cutting size information, the server modifies the die cutting size information twice from the winding process affected by tension, and the cell produced according to the target die cutting size information can overcome the influence of tension in the winding process, meet the preset tab area requirement, and also meet the tab alignment requirement, thereby improving the tab alignment precision of the cell tabs.

[0083] In an example embodiment, before the step S102 of obtaining an initial cell according to the initial die cutting size information of the cell tabs, the following contents are further included: obtaining initial area information corresponding to the initial cell and preset distribution information corresponding to the initial cell; and confirming the initial die cutting size information of the cell tabs according to the initial area information and the preset distribution information.

[0084] The initial area information is used to represent the area of the cell tabs of the initial cell; the preset distribution information is used to represent the distribution of the cell tabs of the initial cell; and in this embodiment, the initial area information is taken as the same tab width of each layer, for example, 4mm, and the preset distribution information is taken as the uniform distribution of the positive and negative tabs, for example, 180° apart.

[0085] ​Specifically, the server needs to confirm the initial cutting size information of the cell tab before obtaining the initial cell according to the initial cutting size information of the cell tab. The initial cutting size information of the cell tab is confirmed as follows: the server first obtains the initial area information and preset distribution information corresponding to the initial cell and the cell production information from the database; then, according to the needle diameter, winding angle and reference thickness of the tape in the cell production information, the cell winding radius is confirmed, and according to the cell winding radius and the winding angle, the length of the tape in the winding process is confirmed; then, according to the length of the tape in the winding process, the initial cutting size information of the cell tab is confirmed according to the initial area information, that is, the width of each layer of the tab is consistent, and the preset distribution information, that is, the positive and negative tabs are separated by 180°.

[0086] It can be understood that there are many specifications of cells in actual production, and the initial area information and preset distribution information of the initial cell corresponding to different specifications of cells and the cell production information may be different. Therefore, before obtaining these information, the server needs to receive the cell production instruction of the initial cell first, and according to the cell production identifier carried by the cell production instruction, query the data corresponding to the cell production identifier from the database.

[0087] In this embodiment, the server confirms the initial cutting size information of the initial cell through the initial area information and preset distribution information corresponding to the initial cell and the cell production information, so as to cut and wind the initial cell according to the initial cutting size information, facilitate the subsequent correction and the final confirmation of the target cutting size information, and improve the tab alignment accuracy of the cell tab.

[0088] In an exemplary embodiment, before the step S104 of correcting the initial cutting size information according to the tab offset of the initial cell to obtain the corrected initial cutting size information, the following contents are further included: identifying the center line of each layer of the same-pole cell tab of the initial cell to obtain the tab offset of the initial cell.

[0089] The step S104 of correcting the initial cutting size information according to the tab offset of the initial cell to obtain the corrected initial cutting size information includes the following contents: identifying the tab offset between the last layer of cell tab and the first layer of cell tab from the tab offset of the initial cell as a reference offset; correcting the initial cutting size information according to the relationship between the reference offset and the winding layer number of the initial cell to obtain the corrected initial cutting size information.

[0090] Among them, the tab offset includes the offset between the center lines of the tabs of each layer of the same electrode cell; the relationship between the reference offset and the number of winding layers of the initial cell is learned by the server based on historical correction experience, and is used to correct the initial die-cutting size so that the cell obtained according to the corrected initial die-cutting size can meet the initial area information requirements and the preset distribution information requirements; the number of winding layers of the initial cell refers to the number of winding layers of the material strip during the production of the initial cell.

[0091] Specifically, after obtaining the initial battery cell, the server uses machine detection to obtain the electrode distribution information of the initial battery cell. Based on the electrode distribution information, it identifies the center lines of the electrode tabs of each layer of the initial battery cell and selects the offset between the center lines of the same electrode tabs as the electrode offset. Then, it identifies the electrode offset between the last layer electrode tab and the first layer electrode tab from the electrode offset, such as the electrode offset between the last positive electrode tab and the first positive electrode tab, and confirms it as the reference offset. Finally, it linearly fuses the initial die-cutting size with the relationship between the reference offset learned by the server and the number of winding layers of the initial battery cell to complete the correction of the initial die-cutting size.

[0092] Understandably, assuming the server learns from historical correction experience the relationship between the reference offset and the initial number of winding layers in the battery cell—a ratio between the reference offset and the number of winding layers—the server linearly fuses the initial die-cutting size with this ratio to obtain the corrected initial die-cutting size. It should be noted that this linear fusion can be one or more of the following: addition, subtraction, multiplication, or division; the choice is made by the server based on its historical correction experience.

[0093] In this embodiment, the server detects and identifies the initial battery cell, obtaining the tab offset of the initial battery cell affected by tension. Then, based on the tab offset, it determines the correction amount and method for the initial die-cutting size, thereby achieving the first correction of the initial die-cutting size. The first correction can be understood as adjusting the alignment of the battery cell tabs, so that the battery cell tab distribution obtained based on the die-cutting size information after the first correction can meet the alignment accuracy requirements, thus improving the tab alignment accuracy of the battery cell.

[0094] In an exemplary embodiment, step S108 above, which involves further revising the modified initial die-cutting size information based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells, specifically includes the following: obtaining the area difference information between the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells; and revising the modified initial die-cutting size information again based on the relationship between the area difference information and the number of winding layers of the initial battery cell.

[0095] The area difference information between the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs is used to represent the difference relationship between the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs, and specifically can be the difference value between the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs. The relationship between the area difference information and the number of winding layers of the initial cell is learned by the server according to historical correction experience, and is used to further correct the initial die cutting size, so that the cell obtained according to the initial die cutting size after two corrections can meet the correction amount of the preset area information requirement and the preset distribution information requirement. The preset area information is used to represent the preset tab area, and it can be understood that the preset tab area of each layer of tabs can be determined according to the preset area information.

[0096] Specifically, the server detects the initial cell after the increase in area to obtain the tab distribution information of the initial cell after the increase in area, identifies the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs, such as the increased tab area of the last layer of positive electrode tabs and the increased tab area of the first layer of positive electrode tabs, from the tab distribution information after the increase in area, and obtains the area difference value between the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs. Finally, the corrected initial die cutting size is linearly fused with the relationship between the area difference information and the number of winding layers of the initial cell to complete the further correction of the corrected initial die cutting size.

[0097] It can be understood that if the relationship between the area difference information and the number of winding layers of the initial cell learned by the server through historical correction experience is a ratio relationship between the area difference value and the number of winding layers, the server linearly fuses the corrected initial die cutting size with the ratio relationship to complete the further correction of the corrected initial die cutting size. It should be noted that the linear fusion can be one or more of addition, subtraction, multiplication and division, which is also selected by the server based on historical correction experience.

[0098] In this embodiment, the server can confirm the area difference value between the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs by detecting and identifying the increased area of the initial cell, and then determine the correction amount and correction method of the second correction of the initial die cutting size based on the area difference value, so as to realize the second correction of the initial die cutting size. The second correction can be understood as adjusting the area based on the adjustment of the tab alignment degree, so that the cell tab distribution obtained according to the die cutting size information after the second correction can meet the requirements of tab alignment degree accuracy and preset tab area, thereby further improving the tab alignment degree accuracy of the cell tab.

[0099] In an exemplary embodiment, the step S106 of determining the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs according to the corrected initial die cutting size information specifically includes the following contents: obtaining preset area information of each layer of cell tabs; increasing the tab area of each layer of cell tabs based on the corrected initial die cutting size information and the preset area information to obtain the increased tab area of each layer of cell tabs; identifying the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs from the increased tab area of each layer of cell tabs.

[0100] Specifically, the server queries the preset area information corresponding to the cell production identifier from the database according to the cell production identifier carried by the received cell production instruction; then increases the tab area of each layer of cell tabs based on the corrected initial die cutting size information and the preset area information, so that each layer of cell tabs after increasing the area meets the preset area information; and then detects the increased tab area of each layer of cell tabs to identify the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs.

[0101] In this embodiment, the server queries the corresponding preset area information through the cell production instruction corresponding to the initial cell, and adjusts the area of each layer of cell tabs based on the corrected die cutting size information according to the preset area information, so that the adjusted area of the cell tabs meets the preset tab area information requirement, and then identifies the increased tab area of the last layer of cell tabs and the increased tab area of the first layer of cell tabs from the adjusted area of the cell tabs, which is helpful for the server to determine the correction amount of the corrected die cutting size information, thereby improving the tab alignment degree accuracy of the cell tabs.

[0102] In an example embodiment, based on the corrected initial die cutting size information and the preset area information, the tab area of each layer of the battery tab is increased, specifically including the following contents: obtaining the sector angle information corresponding to the preset area information of each layer of the battery tab and the battery radius information corresponding to each layer of the battery tab; according to the sector angle information and the battery radius information, confirming the tab area to be increased for each layer of the battery tab; and updating the tab area of each layer of the battery tab according to the tab area to be increased for each layer of the battery tab.

[0103] Among them, the sector angle information is used to represent the sector angle corresponding to the preset area of each layer of the battery tab, for example, the preset area of the last layer of the battery tab is 10 mm, and the corresponding sector angle is 90°; the battery radius information is used to represent the battery radius corresponding to each layer of the battery tab, for example, the battery radius corresponding to the last layer of the battery tab is 7 mm.

[0104] Specifically, the server obtains the sector angle corresponding to the preset area of each layer of the battery tab and the battery radius corresponding to each layer of the battery tab; then according to the sector angle and the battery radius, the tab arc length of each layer of the battery tab is determined, so as to determine the area increment of each layer of the battery tab; according to the area increment, the tab area to be increased for each layer of the battery tab is determined, and the tab area of each layer of the battery tab is updated according to the tab area to be increased, so that the updated area of the battery tab meets the preset area requirement.

[0105] In this embodiment, the server determines the area increment of each layer of the battery tab through the sector angle information and the battery radius, so as to determine the tab area to be increased for each layer of the battery tab, which can realize the adjustment of the area of each layer of the battery tab, further realize the second correction of the corrected initial die cutting size information, and improve the tab alignment accuracy of the battery tab.

[0106] In an example embodiment, as shown in Figure 7 Another tab die cutting size information confirmation method is provided, which is applied to a server corresponding to a battery cutting and winding device, including the following steps:

[0107] Step S701, according to the initial area information obtained from the battery tab production instruction of the battery tab and the preset distribution information, confirming the initial die cutting size information of the battery tab.

[0108] Step S702, according to the initial die cutting size information, obtaining the initial battery.

[0109] Step S703, identifying the center line of each layer of the same polarity battery tab of the initial battery, and confirming the tab offset between the last layer of the battery tab and the first layer of the battery tab as the reference offset.

[0110] Step S704, the initial die cutting size information is fused with the relationship between the reference offset and the winding layer number of the initial battery cell to obtain modified initial die cutting size information.

[0111] Step S705, the sector angle information corresponding to the preset area information of the battery cell tab and the battery cell radius information corresponding to the battery cell tab are obtained.

[0112] Step S706, according to the sector angle information and the battery cell radius information, the increased tab area of the last layer of battery cell tab and the increased tab area of the first layer of battery cell tab are obtained, and the area difference information between them is confirmed.

[0113] Step S707, the modified initial die cutting size information is fused with the relationship between the area difference information and the winding layer number of the initial battery cell to obtain target die cutting size information.

[0114] In the embodiment, the server adjusts the first correction of the initial die cutting size information through the tab offset of the initial battery cell, which can adjust the alignment of the tab; and the second correction of the initial die cutting size information through the increased tab area of the last layer of battery cell tab and the first layer of tab, which can make the tab area further meet the preset requirement, so as to obtain the target die cutting size information. The confirmation process of the above target die cutting size information is that the server corrects the die cutting size information twice from the winding process affected by tension, and the battery cell produced according to the target die cutting size information can overcome the influence of tension in the winding process, meet the preset tab area requirement, and also meet the requirement of tab alignment, thereby improving the tab alignment precision of the battery cell tab.

[0115] In order to more clearly illustrate the tab die cutting size information confirmation method provided by the embodiment of the application, the tab die cutting size information confirmation method is specifically described below with one specific embodiment. In an exemplary embodiment, as shown in the process flowchart of Figure 8 The application also provides a method for adjusting the alignment of the same side cylindrical tab by adjusting the die cutting size slope, which specifically includes the following steps:

[0116] Step 1: determine the length of the tape for each turn through the relationship between the length of the tape, the diameter of the winding needle, the winding angle, the winding radius of the battery cell, and the reference thickness of the tape during the winding process of the battery cell.

[0117] Step 2: according to the length of the tape for each turn, confirm the die cutting size of the tab and the initial die cutting size slope according to the requirement that the positive and negative tabs are separated by 180° and each layer of tab has the same width.

[0118] Step 3: cutting the material according to the die cutting size to obtain the positive electrode material belt, the negative electrode material belt and the separator material belt; and winding in the order of the separator material belt, the negative electrode material belt, the separator material belt and the positive electrode material belt to obtain the battery cell with the tab distribution as shown in Figure 3 . .

[0119] Step 4: confirming the center line of the last layer of the same-polarity tab of the battery cell obtained in Step 3 relative to the offset of the center line of the first layer of the battery cell tab, and correcting the initial die cutting size slope confirmed in Step 2 according to the relationship between the center line offset and the number of winding layers, so that the tab distribution of the battery cell wound according to the corrected initial die cutting size slope can satisfy the requirement of consistent tab width of each layer as shown in Figure 2 . .

[0120] Step 5: based on the corrected initial die cutting size slope confirmed in Step 4, increasing the area of each layer of the battery cell tab according to the preset area of each layer of the battery cell tab to obtain the tab distribution as shown in Figure 5 . .

[0121] Step 6: based on the tab distribution as shown in Figure 5 , confirming the area increase difference between the area increase of the last layer of the same-polarity tab and the area increase of the first layer of the battery cell tab, and correcting the corrected initial die cutting size slope obtained in Step 5 to obtain a target die cutting size slope according to the relationship between the area increase difference and the number of winding layers. Winding the material belt cut according to the target die cutting size slope can obtain the battery cell with the tab distribution as shown in Figure 5 . .

[0122] In this embodiment, the server first corrects the initial die cutting size slope by the center line offset to adjust the tab alignment of the battery cell tab, and then corrects the initial die cutting size slope by the area increase from the consistent tab width to the preset tab area to adjust the area of the battery cell tab. In other words, the two corrections of the initial die cutting size slope are based on the actual winding result, which can overcome the tab misalignment caused by factors such as unstable material belt tension, uneven positive electrode tab thickness, uneven negative electrode tab thickness, uneven diaphragm thickness, change of winding needle diameter and existence of round runout of the winding needle, thereby improving the tab alignment of the battery cell tab and further ensuring the production requirements of the later process and the quality of the lithium battery.

[0123] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other sequences. Moreover, at least some of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of the steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0124] Based on the same inventive concept, the embodiments of the present application also provide a tab die cutting size information device for implementing the above-mentioned tab die cutting size information method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more tab die cutting size information device embodiments provided below can refer to the limitations of the tab die cutting size information method in the above text, which will not be repeated here.

[0125] In an exemplary embodiment, as shown in Figure 9 A tab die cutting size information confirmation device is provided, comprising: a battery cell production module 902, a first correction module 904, an area increase module 906, and a second correction module 908, wherein:

[0126] The battery cell production module 902 is configured to obtain an initial battery cell according to initial die cutting size information of the battery cell tab.

[0127] The first correction module 904 is configured to correct the initial die cutting size information according to a tab offset of the initial battery cell to obtain corrected initial die cutting size information; the tab offset is a tab offset of a last layer of battery cell tabs relative to a first layer of battery cell tabs of the initial battery cell.

[0128] The area increase module 906 is configured to determine an increased tab area of the last layer of battery cell tabs and an increased tab area of the first layer of battery cell tabs according to the corrected initial die cutting size information.

[0129] The second correction module 908 is configured to correct the corrected initial die cutting size information again according to the increased tab area of the last layer of battery cell tabs and the increased tab area of the first layer of battery cell tabs to obtain target die cutting size information.

[0130] In an exemplary embodiment, the electrode die-cutting size information device further includes an information acquisition module, which is used to acquire initial area information corresponding to the initial battery cell and preset distribution information corresponding to the initial battery cell; the initial area information is used to characterize the area of ​​the battery cell electrode of the initial battery cell, and the preset distribution information is used to characterize the distribution of the battery cell electrode of the initial battery cell; and the initial die-cutting size information of the battery cell electrode is confirmed based on the initial area information and the preset distribution information.

[0131] In an exemplary embodiment, the tab die-cutting size information device further includes an offset recognition module for recognizing the center lines of the tabs of each layer of the initial cell to obtain the tab offset of the initial cell; the tab offset includes the offset between the center lines of the tabs of each layer of the initial cell.

[0132] The first correction module 904 is further configured to identify the tab offset between the last layer of battery cell tab and the first layer of battery cell tab from the tab offset of the initial battery cell, and use it as a reference offset; and correct the initial die-cutting size information according to the relationship between the reference offset and the number of winding layers of the initial battery cell, so as to obtain the corrected initial die-cutting size information.

[0133] In an exemplary embodiment, the second correction module 908 is further configured to obtain the area difference information between the increased tab area of ​​the last layer of battery cell tab and the increased tab area of ​​the first layer of battery cell tab; and to correct the corrected initial die-cutting size information again based on the relationship between the area difference information and the number of winding layers of the initial battery cell.

[0134] In an exemplary embodiment, the area increasing module 906 is further configured to obtain preset area information of each layer of battery cell tabs; based on the corrected initial die-cutting size information and preset area information, increase the tab area of ​​each layer of battery cell tabs to obtain the increased tab area of ​​each layer of battery cell tabs; and identify the increased tab area of ​​the last layer of battery cell tabs and the increased tab area of ​​the first layer of battery cell tabs among the increased tab areas of each layer of battery cell tabs.

[0135] In an exemplary embodiment, the area increasing module 906 is further configured to obtain sector angle information corresponding to the preset area information of each layer of battery cell tabs, and battery cell radius information corresponding to each layer of battery cell tabs; determine the tab area to be increased for each layer of battery cell tabs based on the sector angle information and the battery cell radius information; and update the tab area of ​​each layer of battery cell tabs based on the tab area to be increased for each layer of battery cell tabs.

[0136] The various modules in the above tab tip cutting size information confirmation device can be implemented in whole or in part by software, hardware, and combinations thereof. The various modules can be embedded in or independent of the processor in the battery cell cutting and winding equipment in hardware form, or stored in the memory in the battery cell cutting and winding equipment in software form, so that the processor can call and execute the operations corresponding to the various modules.

[0137] In an exemplary embodiment, a battery cell cutting and winding equipment is provided, which can be a server, and its internal structure diagram can be as shown in Figure 10 The battery cell cutting and winding equipment includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the battery cell cutting and winding equipment is used to provide computing and control capabilities. The memory of the battery cell cutting and winding equipment includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the battery cell cutting and winding equipment is used to store production information data of battery cells of different specifications. The input / output interface of the battery cell cutting and winding equipment is used to exchange information between the processor and external devices. The communication interface of the battery cell cutting and winding equipment is used to communicate with external terminals through network connection. The computer program is executed by the processor to implement a battery cell cutting and winding method.

[0138] Those skilled in the art can understand that Figure 10 The structure shown in the above is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the battery cell cutting and winding equipment to which the scheme of the present application is applied. The specific battery cell cutting and winding equipment can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0139] In an exemplary embodiment, a battery cell cutting and winding equipment is also provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0140] In an exemplary embodiment, a computer readable storage medium is provided, which stores a computer program. The computer program is executed by a processor to implement the steps in the above method embodiments.

[0141] In an exemplary embodiment, a computer program product is provided, which includes a computer program. The computer program is executed by a processor to implement the steps in the above method embodiments.

[0142] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant laws, regulations and standards of the country and region.

[0143] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiments of the methods. Any reference to a memory, database or other medium used in the embodiments provided by the present application can include at least one of a non-volatile and volatile memory. The non-volatile memory can include a read-only memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical storage, a high-density embedded non-volatile memory, a resistive memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric memory (FRAM), a phase change memory (PCM), a graphene memory, etc. The volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as a static random access memory (SRAM) or a dynamic random access memory (DRAM), etc. The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a blockchain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0144] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0145] The above embodiments only express several implementation ways of the present application, and the description is more specific and detailed, but it should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for confirming the die-cutting dimensions of electrode tabs, characterized in that, The method includes: Based on the initial die-cutting dimensions of the battery cell tabs, the initial battery cell is obtained; Based on the tab offset of the initial cell, the initial die-cutting size information is corrected to obtain the corrected initial die-cutting size information; the tab offset is the tab offset of the last layer of the initial cell relative to the first layer of the initial cell. Based on the corrected initial die-cutting size information, the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells are determined. Based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells, the modified initial die-cutting size information is further modified to obtain the target die-cutting size information.

2. The method according to claim 1, characterized in that, Before obtaining the initial battery cell based on the initial die-cutting dimensions of the battery cell tabs, the process also includes: Obtain initial area information and preset distribution information corresponding to the initial battery cell; the initial area information is used to characterize the area of ​​the battery cell tabs of the initial battery cell, and the preset distribution information is used to characterize the distribution of the battery cell tabs of the initial battery cell. Based on the initial area information and the preset distribution information, the initial die-cutting size information of the battery cell tab is confirmed.

3. The method according to claim 1, characterized in that, Before correcting the initial die-cutting size information based on the initial electrode offset of the battery cell to obtain the corrected initial die-cutting size information, the process further includes: The center lines of the tabs of each layer of the initial battery cell are identified to obtain the tab offset of the initial battery cell; the tab offset includes the offset between the center lines of the tabs of each layer of the initial battery cell. The step of correcting the initial die-cutting size information based on the initial electrode offset of the battery cell to obtain the corrected initial die-cutting size information includes: From the tab offset of the initial cell, the tab offset between the last cell tab and the first cell tab is identified and used as a reference offset; Based on the relationship between the reference offset and the number of winding layers of the initial cell, the initial die-cutting size information is corrected to obtain the corrected initial die-cutting size information.

4. The method according to claim 1, characterized in that, The step of further revising the modified initial die-cutting size information based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells includes: Obtain the area difference information between the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells; Based on the relationship between the area difference information and the number of winding layers of the initial cell, the corrected initial die-cutting size information is adjusted again.

5. The method according to any one of claims 1 to 4, characterized in that, The step of determining the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells based on the corrected initial die-cutting size information includes: Obtain the preset area information of the battery cell tabs in each layer; Based on the corrected initial die-cutting size information and the preset area information, the tab area of ​​each layer of battery cell tabs is increased to obtain the increased tab area of ​​each layer of battery cell tabs; Among the increased tab areas of each layer of battery cell tabs, the increased tab area of ​​the last layer of battery cell tabs and the increased tab area of ​​the first layer of battery cell tabs are identified.

6. The method according to claim 5, characterized in that, The step of increasing the tab area of ​​each layer of battery cells based on the corrected initial die-cutting size information and the preset area information includes: Obtain the sector angle information corresponding to the preset area information of each layer of battery cell tabs, and the cell radius information corresponding to each layer of battery cell tabs; Based on the sector angle information and the cell radius information, the area of ​​the tabs to be added to each layer of cell tabs is determined; Update the tab area of ​​each layer of battery cells according to the tab area to be increased.

7. A device for confirming electrode tab die-cutting size information, characterized in that, The device includes: The cell production module is used to obtain the initial cell according to the initial die-cutting size information of the cell tabs; The first correction module is used to correct the initial die-cutting size information according to the tab offset of the initial cell to obtain the corrected initial die-cutting size information; the tab offset is the tab offset of the last layer of the initial cell relative to the first layer of the initial cell. An area increase module is used to determine the increased tab area of ​​the last layer of battery cell tabs and the increased tab area of ​​the first layer of battery cell tabs based on the corrected initial die-cutting size information. The second correction module is used to further correct the initial die-cutting size information based on the increased tab area of ​​the last layer of battery cells and the increased tab area of ​​the first layer of battery cells, so as to obtain the target die-cutting size information.

8. A battery cell cutting and winding device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

Images