Shaping device and shaping method for battery cell tab and battery monomer

Abstract

The invention provides a shaping device and a shaping method for a battery cell tab and a battery monomer, the shaping device comprises a first shaping piece and a second shaping piece which are oppositely arranged, a shaping gap for accommodating a tab structure is formed between the first shaping piece and the second shaping piece, and in a first direction, the shaping gap is formed between the first shaping piece and the second shaping piece; the minimum distance from the second shaping piece to the battery cell body is smaller than the minimum distance from the first shaping piece to the battery cell body; the base and the second shaping piece are positioned on the same side of the battery cell body and are used for supporting the battery cell body; the pre-folding part is connected with the second shaping piece or the base, and is used for pre-shaping the tab structure, so that the tab structure forms an outer bending point, the region, which is extruded and folded by the second shaping piece, of the tab on one side of the second shaping piece is larger, and the tab on the side is better folded; the tab on the side is further extruded and folded through the pre-folding part to form the outer bending point, so that the tab on the side is further folded inwards, the possibility that the tab group on the outer side protrudes outwards is reduced, and the problem of insertion of the tab group on the outer side is solved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a cell tab shaping device, shaping method and cell. Background Technology

[0002] During battery assembly, the tabs need to be placed horizontally for welding and then welded to the cover plate. The welded cells are then rotated to ensure they are placed vertically; this process is called cell assembly. After cell assembly, the tabs are shaped before the cells are installed into the casing. However, the shaping effect of cell assembly is limited, often resulting in the tabs becoming embedded or torn. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a shaping device, shaping method and battery cell for shaping the battery cell tab.

[0004] To achieve the above objectives, a first aspect of this application provides a shaping device for a battery cell tab, the battery cell including a battery cell body and a tab structure extending from the battery cell body along a first direction, the shaping device comprising:

[0005] The first shaping member and the second shaping member are arranged opposite to each other, and there is a shaping gap between the first shaping member and the second shaping member for accommodating the electrode structure. In the first direction, the minimum distance from the second shaping member to the cell body is less than the minimum distance from the first shaping member to the cell body.

[0006] The base, located on the same side of the battery cell body as the second shaping component, is used to support the battery cell body;

[0007] The pre-folded portion is connected to the second shaping member or the base. The pre-folded portion is used to pre-shape the tab structure so that the tab structure forms an outward bending point.

[0008] Optionally, the pre-folded portion is connected to the end of the second shaping member near the cell body, the pre-folded portion extends along the thickness direction of the cell, and the pre-folded portion includes a pressing end near the tab structure, the pressing end protruding from the second shaping member.

[0009] Optionally, the extrusion end extends to the side of the first plane away from the second shaping member, where the first plane is the plane where the shaping gap is located.

[0010] Optionally, the centerline of the cell in the thickness direction is the first axis, and the extrusion end is located between the first axis and the first plane.

[0011] Optionally, the electrode structure includes multiple electrodes, the multiple electrodes located on the side of the first plane closer to the first shaping member are called the inner electrode group, and the multiple electrodes located on the side of the first plane closer to the second shaping member are called the outer electrode group.

[0012] The pre-folded portion is connected to the side of the base near the second shaping member. The pre-folded portion can move along the thickness direction of the cell towards the outer tab group to squeeze the outer tab group and form the outer bending point, or move away from the outer tab group to move away from the outer tab group.

[0013] Based on the same inventive concept, a second aspect of this application provides a method for shaping a battery cell tab, wherein the battery cell includes a battery cell body and a tab structure extending from the battery cell body along a first direction, the method comprising:

[0014] Provide the shaping device as described in any of the first aspects above;

[0015] The shaping device shapes the tab structure, causing the outer tab group of the tab structure to converge toward the inner tab group to form an outer bending point, and causing the inner tab group of the tab structure to converge toward the outer tab group to form an inner bending point.

[0016] The electrode structure includes multiple electrodes. The multiple electrodes located on the side of the first plane closer to the first shaping member are called the inner electrode group, and the multiple electrodes located on the side of the first plane closer to the second shaping member are called the outer electrode group. The first plane is the plane where the shaping gap is located.

[0017] In the first direction, the minimum distance between the outer bending point and the cell body is less than the minimum distance between the inner bending point and the cell body.

[0018] In the thickness direction of the battery cell, the outer bending point is located on the side of the inner bending point away from the second shaping member.

[0019] Optionally, the shaping of the tab structure based on the shaping device, causing the outer tab group of the tab structure to converge towards the inner tab group to form an outward bending point, and causing the inner tab group of the tab structure to converge towards the outer tab group to form an inward bending point, includes:

[0020] The battery cell is placed on the base, and the tab structure is placed on the second shaping component, with the outer tab assembly fitting against the second shaping component;

[0021] Based on the second shaping component and the pre-folded portion, the outer tab group is shaped so that the outer tab group is brought closer to the inner tab group to form an outward bending point.

[0022] The inner tab group is shaped based on the first shaping component, so that the inner tab group is brought closer to the outer tab group to form an inner bending point.

[0023] Optionally, the pre-folded portion is connected to the end of the second shaping member near the cell body, and the pre-folded portion includes a pressing end near the tab structure, the pressing end protruding from the second shaping member;

[0024] The shaping of the outer tab assembly based on the second shaping member and the pre-folded portion, causing the outer tab assembly to converge towards the inner tab assembly to form an outward bending point, includes:

[0025] The second shaping component is driven to move closer to the first shaping component, thereby causing the pre-folded portion to move closer to the outer tab assembly and causing the extrusion end to extrude the outer tab assembly to form an outer bending point.

[0026] Optionally, the step of shaping the inner tab group based on the first shaping member, causing the inner tab group to converge towards the outer tab group to form an inner bending point, includes:

[0027] The first shaping member is driven to move closer to the second shaping member, so that the first shaping member squeezes the inner tab group, causing the inner tab group to converge closer to the outer tab group to form an inner bending point.

[0028] Optionally, after shaping the inner tab assembly based on the first shaping element, the method further includes:

[0029] The electrode structure is welded to form a welded part, and the orthographic projection of the welded part on the first plane does not coincide with the orthographic projection of the outer bending point and the inner bending point on the first plane.

[0030] Optionally, the centerline of the battery cell in the thickness direction is the first axis, and the centerline of the welding part in the thickness direction of the battery cell is the second axis. In the thickness direction of the battery cell, the second axis is located on the side of the first axis closer to the second shaping part.

[0031] Optionally, after welding the tab structure to form a welded portion, the method further includes:

[0032] The base is driven to rotate, so that the base drives the battery cell to rotate towards the first shaping component, until the center line of the battery cell in the thickness direction is perpendicular to the first direction.

[0033] Optionally, the pre-folded portion is connected to the side of the base near the second shaping member, and the pre-folded portion can move along the thickness direction of the cell towards the outer tab group to squeeze the outer tab group, or move away from the outer tab group to move away from the outer tab group.

[0034] The shaping of the electrode structure based on the shaping device, causing the outer electrode group of the electrode structure to converge towards the inner electrode group to form an outward bending point, and causing the inner electrode group of the electrode structure to converge towards the outer electrode group to form an inward bending point, includes:

[0035] The battery cell is placed on the base, and the electrode structure is placed in the shaping gap between the first shaping component and the second shaping component, with the outer electrode assembly fitting against the second shaping component;

[0036] Drive the first shaping member to move closer to the second shaping member, so that the first shaping member squeezes the inner tab group, and the inner tab group is brought together closer to the outer tab group to form an inner bending point.

[0037] The base is driven to rotate so that the base drives the battery cell to rotate toward the first shaping component, and the angle between the first axis and the first direction is determined in real time. The first axis is the center line of the thickness direction of the battery cell.

[0038] In response to the included angle reaching a first preset included angle, the pre-folded portion is driven to move along the thickness direction of the battery cell towards the outer tab group to squeeze the outer tab group, causing the outer tab group to fold towards the inner tab group to form an outer bending point.

[0039] Optionally, the method further includes:

[0040] In response to the included angle reaching a second preset included angle, the pre-folded portion is driven to move away from the outer tab group along the thickness direction of the battery cell, so as to move away from the outer tab group, while the rotation of the base is stopped; wherein, the second preset included angle is greater than the first preset included angle.

[0041] Optionally, among the multiple tabs of the tab structure, the tab that contacts the first shaping member is the first tab, and the tab that contacts the second shaping member is the second tab. Both the first tab and the second tab include a solder area.

[0042] Before the shaping of the electrode structure based on the shaping device, the method further includes:

[0043] Adhesive pieces are attached to the side of the first electrode tab away from the first shaping member and the side of the second electrode tab away from the second shaping member;

[0044] Wherein, the orthographic projection of the adhesive on the first plane does not coincide with the orthographic projection of the solder area on the first plane, and the first plane is the plane where the shaping gap is located.

[0045] Based on the same inventive concept, a third aspect of this application provides a battery cell, the battery cell including a tab structure shaped according to the shaping method described in the second aspect above.

[0046] As can be seen from the above, the battery cell tab shaping device, shaping method, and battery cell provided in this application include a first shaping member and a second shaping member disposed opposite to each other, with a shaping gap between the first shaping member and the second shaping member for accommodating the tab structure. In a first direction, the minimum distance from the second shaping member to the battery cell body is less than the minimum distance from the first shaping member to the battery cell body. A base and the second shaping member are located on the same side of the battery cell body and are used to support the battery cell body. A pre-folding portion is connected to the second shaping member or the base, and the pre-folding portion is used to pre-shape the tab structure so that the tab structure forms an outward bending point. Thus, by setting the minimum distance from the second shaping member to the battery cell body to be less than the minimum distance from the first shaping member to the battery cell body, the first shaping member and the second shaping member are used to press the tab structure together to shape the tab structure. During assembly, because the second shaping component is positioned closer to the cell body, the area on the tab closest to the second shaping component that is squeezed and gathered by the second shaping component is larger. This allows for better gathering of the tab on that side, resulting in a smaller area of ​​free movement within the tab during subsequent cell assembly. This reduces the possibility of the tab protruding outwards and lowers the risk of the tab being inserted internally. Furthermore, by providing a pre-folded portion on the same side of the second shaping component, the tab on that side can be further squeezed and gathered to form an outward bending point. The formation of the outward bending point causes the tab to gather further inwards, further reducing the area of ​​the tab that is not gathered during subsequent cell assembly. This further reduces or even eliminates the possibility of the tab protruding outwards, effectively solving the problem of the tab being inserted internally. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic diagram of the existing electrode assembly welding process is shown;

[0049] Figure 2 This diagram shows the structure of a battery cell before tab shaping and welding.

[0050] Figure 3 A schematic diagram of the first shaping device is shown;

[0051] Figure 4 This diagram shows a structural schematic of the battery cell tabs being shaped using a first shaping device.

[0052] Figure 5 This diagram illustrates the structure of the battery cell tabs when a second shaping device is used to shape them.

[0053] Figure 6 A schematic diagram of the third shaping device is shown;

[0054] Figure 7 This diagram illustrates the structure of the battery cell tabs when a third shaping device is used to shape them.

[0055] Figure 8 A schematic diagram of the first structure is shown during the process of simultaneously shaping the tab structure of four battery cells;

[0056] Figure 9 A schematic diagram of the structure after the four battery cells are shaped, welded, and joined together is shown.

[0057] Figure 10 A second structural schematic diagram is shown during the process of simultaneously shaping the tab structure of four battery cells;

[0058] Figure 11 A schematic diagram of the third structure is shown during the process of simultaneously shaping the tab structure of four battery cells;

[0059] Figure 12 A schematic diagram of a battery cell with an adhesive component attached to the outside of the tab structure is shown.

[0060] In the diagram: 001, upper pressure plate; 002, lower pressure plate; 003, battery cell to be welded; 004, electrode assembly; 005, gathering point; 100, first forming part; 110, first pressure plate; 120, first welding head; 200, forming gap; 300, second forming part; 310, second pressure plate; 320, second welding head; 400, pre-folded part; 410, extrusion end; 500, base; 60 0. Battery cell; 610. Electrode structure; 611. Inner electrode assembly; 6111. Inner bending point; 612. Outer electrode assembly; 6121. Outer bending point; 613. First electrode; 614. Second electrode; 620. Soldering area; 630. Welding part; 700. Drive structure; 710. Fixing component; 720. Drive component; 800. Cover plate; 810. Terminal post; 900. Adhesive component. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0062] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0063] It should be noted that, unless otherwise defined, the terms "parallel" and "perpendicular" as used in the embodiments of this application include the described situation and situations similar to the described situation, where the range of similar situations is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism may be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity may also be, for example, within 5°.

[0064] A battery cell is made by stacking or winding positive and negative electrode plates. Copper foil or copper sheets are led out from the electrode plates, and the corresponding copper foil or copper sheets from each electrode plate are stacked to form the electrode tabs of the battery cell. During battery assembly, the electrode tabs need to be placed horizontally and welded to the cover plate. Then, the welded battery cell is rotated to make it vertical. This process is called cell assembly. After cell assembly, the electrode tabs are shaped, and then the battery cell is assembled into the casing.

[0065] Figure 1A schematic diagram of the existing welding process for the tab assembly 004 is shown. During welding, the tab assembly 004 is placed between the upper pressure plate 001 and the lower pressure plate 002, which press the tab assembly 004 together. Then, a welding head is used to weld the portion of the tab assembly 004 located between the upper pressure plate 001 and the lower pressure plate 002, thereby achieving the welding of the tab assembly 004. Welding allows multiple tabs of the tab assembly 004 to be welded together, facilitating subsequent assembly.

[0066] However, the welding only applies to the welding area of ​​the tabs, leaving the ends of the tabs near the electrode plates (i.e., the roots of the tabs) unwelded. This results in the roots of the tabs not fitting together, which makes it easy for the roots of the tabs to tear during the later adjustment and insertion of the battery cell 600 into the casing. It is also very easy for the tabs to be inserted into the battery cell 600.

[0067] To solve this problem, existing methods typically involve shaping the tab assembly 004 after welding and during the core-joining process. This is done by pressing the root of the tab assembly 004 inward through methods such as extrusion, to prevent the root of the tab assembly 004 from protruding outward during the core-joining process, thereby solving the problem of tab insertion.

[0068] Since tab shaping is performed after welding, and the welding has already fixed the tab assembly 004, the range and extent to which the tabs can be shaped are relatively small. Meanwhile, because the existing upper pressure plate 001 and lower pressure plate 002 are essentially the same size, when using the upper pressure plate 001 and lower pressure plate 002 to press the tab assembly 004, the convergence points 005 formed by the upper pressure plate 001 and lower pressure plate 002 on the tab assembly 004 are almost in the same position. In other words, the dimensions of all the unpressed and unconvinced portions on the tabs in the tab assembly 004 are consistent. Therefore, the range and extent to which the inner tabs can be shaped are essentially the same as those on the outer tabs.

[0069] However, during the 600 cell assembly, the bending degree and point of the tabs near the inner and outer sides of the 004 electrode assembly differ. The outer tabs bend more significantly than the inner tabs, making the outer tabs more prone to insertion and tearing compared to the inner tabs. Therefore, using essentially the same shaping amplitude for both the inner and outer tabs cannot completely resolve the tearing or warping of the outer tabs during assembly, and consequently, cannot solve the problem of insertion of the outer tabs.

[0070] Therefore, how to reshape the tabs to solve the tearing and insertion problems during the core assembly process is a problem that needs to be addressed.

[0071] Based on this, this application provides a shaping device for a 600-tab battery cell. Figure 2 A schematic diagram of the cell 600 before tab shaping and welding is shown.

[0072] like Figure 2 As shown, the battery cell 600 includes a battery cell 600 body and an electrode structure 610 extending from the battery cell 600 body along a first direction. The battery cell 600 body is formed by sequentially stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet. Both the positive and negative electrode sheets are along the first direction (i.e., Figure 2 Extending from the direction shown in Figure A, a tab extends out, which is a positive tab and a negative tab respectively. Multiple positive tabs extending from multiple positive electrode plates are stacked together to form a positive electrode tab structure 610, and multiple negative tabs extending from multiple negative electrode plates are stacked together to form a negative electrode tab structure 610. The tab structure 610 of this application can be either a positive electrode tab structure 610 or a negative electrode tab structure 610.

[0073] Figure 3 A schematic diagram of the first shaping device is shown. Figure 4 This diagram shows the structure of the battery cell 600 tabs being shaped using the first shaping device. Figure 5 A schematic diagram of the structure is shown when the second shaping device is used to shape the tabs of the battery cell 600.

[0074] See Figure 3 , Figure 4 and Figure 5 As shown, the shaping device includes: a first shaping member 100 and a second shaping member 300 disposed opposite to each other, with a shaping gap 200 between the first shaping member 100 and the second shaping member 300 for accommodating the tab structure 610; in a first direction, the minimum distance from the second shaping member 300 to the battery cell 600 body is less than the minimum distance from the first shaping member 100 to the battery cell 600 body; a base 500 located on the same side of the battery cell 600 body as the second shaping member 300, for supporting the battery cell 600 body; and a pre-folding portion 400 connected to the second shaping member 300 or the base 500, the pre-folding portion 400 being used to pre-shape the tab structure 610 so that the tab structure 610 forms an external bending point 6121.

[0075] Specifically, the first shaping component 100 may include a first pressure plate 110 and a first welding head 120, the first welding head 120 passing through the first pressure plate 110 so that the first welding head 120 can weld the tab structure 610 located within the shaping gap 200. The second shaping component 300 may include a second pressure plate 310 and a second welding head 320, the second welding head 320 passing through the second pressure plate 310 so that the second welding head 320 can weld the tab structure 610 located within the shaping gap 200.

[0076] A shaping gap 200 for accommodating the tab structure 610 is provided between the first shaping member 100 and the second shaping member 300. During the shaping and welding of the tab, a portion of the tab structure 610 extends into the shaping gap 200. By driving the first shaping member 100 and / or the second shaping member 300 closer together, the tab structure 610 can be squeezed, thereby shaping the tab structure 610. After shaping the tab structure 610, the first welding head 120 and the second welding head 320 are activated to weld the solder area 620 of the tab structure 610, thereby completing the welding of the tab structure 610.

[0077] The tab structure 610 includes multiple tabs. Among the multiple tabs, the multiple tabs located on the inner side when the core is closed are called the inner tab group 611. The innermost tab in the inner tab group 611 is called the first tab 613. The multiple tabs located on the outer side when the core is closed are called the outer tab group 612. The outermost tab in the outer tab group 612 is called the second tab 614.

[0078] When shaping and welding the tabs, when a portion of the tab structure 610 is inserted into the shaping gap 200, the first shaping component 100 is attached to the first tab 613, and the second shaping component 300 is attached to the second tab 614.

[0079] In the first direction, the minimum distance between the second shaping member 300 and the battery cell 600 body is less than the minimum distance between the first shaping member 100 and the battery cell 600 body. Thus, the second shaping member 300 is positioned closer to the battery cell 600 body, while the first shaping member 100 is positioned further away. Therefore, when the first shaping member 100 and the second shaping member 300 are used to press the tab structure 610 together to retract the tab structure 610, the second shaping member 300, being closer to the battery cell 600 body, will result in a greater degree of convergence. This configuration results in a smaller area on the outer tab assembly 612 that is not compressed and gathered by the second shaping member 300. In other words, the area on the outer tab assembly 612 that is compressed and gathered by the second shaping member 300 is larger. This allows for better gathering of the individual tabs in the outer tab assembly 612, resulting in a smaller area of ​​tabs that can move freely during subsequent core assembly. This reduces the possibility of the outer tab assembly 612 bulging outward and lowers the risk of the outer tab assembly 612 being inserted inward.

[0080] The base 500 supports the battery cell 600 body. When shaping the tab structure 610, the battery cell 600 body is placed on the base 500 to support it and ensure its stability during shaping and welding. The base 500 and the second shaping component 300 are located on the same side of the battery cell 600 body.

[0081] The pre-folded portion 400 is connected to the second shaping member 300 or the base 500. Specifically, the pre-folded portion 400 can be connected to the base 500 or the second shaping member 300. Regardless of whether the pre-folded portion 400 is located on the second shaping member 300 or the base 500, the pre-folded portion 400 and the second shaping member 300 are located on the same side of the cell 600 body.

[0082] Thus, when the pre-folded portion 400 pre-shapes the tab structure 610, an outward bending point 6121 can be formed on the outer tab group 612 of the tab structure 610. After the first shaping member 100 and the second shaping member 300 initially compress and gather the tab structure 610, the pre-folded portion 400 can further compress and gather the outer tab group 612 of the tab structure 610, forming the outward bending point 6121 on the outer tab group 612. The formation of the outward bending point 6121 causes the outer tab group 612 to further gather inward, thus further reducing the area of ​​the tabs that are not gathered in the outer tab group 612 during subsequent core assembly. This can further reduce or even eliminate the possibility of the outer tab group 612 protruding outward, thereby effectively solving the problem of the outer tab group 612 being inserted inward.

[0083] In this application, the minimum distance between the second shaping member 300 and the battery cell 600 body is less than the minimum distance between the first shaping member 100 and the battery cell 600 body. When the first shaping member 100 and the second shaping member 300 are used to press the tab structure 610 to close the tab structure 610, since the second shaping member 300 is closer to the battery cell 600 body, the area on the outer tab group 612 that is not squeezed and closed by the second shaping member 300 is smaller. That is, the area on the outer tab group 612 that is squeezed and closed by the second shaping member 300 is larger. This allows for better closure of each tab in the outer tab group 612, making the area of ​​the tabs that can move freely in the outer tab group 612 smaller during subsequent core assembly. This reduces the possibility of the outer tab group 612 bulging outward and lowers the risk of the outer tab group 612 being inserted inward.

[0084] Furthermore, by providing a pre-folded portion 400 on the same side of the second shaping member 300, the pre-folded portion 400 can further compress and gather the outer tab group 612 of the tab structure 610, so that an outward bending point 6121 is formed on the outer tab group 612. In this way, the formation of the outward bending point 6121 causes the outer tab group 612 to gather further inward, so that the area of ​​the tab that is not gathered in the outer tab group 612 is further reduced during subsequent core assembly, which can further reduce or even eliminate the possibility of the outer tab group 612 bulging outward, thereby effectively solving the problem of the outer tab group 612 being inserted inward.

[0085] In some embodiments, see continue to see Figure 4 and Figure 5 The pre-folded portion 400 is connected to the end of the second shaping member 300 near the body of the cell 600, and the pre-folded portion 400 is along the thickness direction of the cell 600 (i.e., Figure 4 Extending in the direction shown in B, the pre-folded portion 400 includes a pressing end 410 near the tab structure 610, the pressing end 410 protruding from the second shaping member 300.

[0086] Specifically, when the first shaping member 100 and the second shaping member 300 are driven to approach each other to shape the tab structure 610, the first shaping member 100 can shape the inner tab group 611 of the tab structure 610 to form an inner bending point 6111 on the inner tab group 611. The inner bending point 6111 is flush with the end face of the first shaping member 100 near the shaping gap 200. The second shaping member 300 can shape the outer tab group 612 of the tab structure 610.

[0087] The pre-folded portion 400 is connected to the end of the second shaping member 300 near the body of the cell 600. The pressing end 410 protrudes from the second shaping member 300. Thus, when the second shaping member 300 shapes the outer tab assembly 612 of the tab structure 610, the pressing end 410 protruding from the second shaping member 300 can further press and shape the outer tab assembly 612 to form an outer bending point 6121 on the outer tab assembly 612. In this way, the initial shaping of the second shaping member 300 and the further shaping of the pre-folded portion 400 can be performed simultaneously, reducing the number of shaping steps and lowering the complexity of the shaping operation.

[0088] Furthermore, since the extrusion end 410 protrudes from the second forming member 300, the outer bending point 6121 formed by the extrusion end 410 also protrudes from the second forming member 300. As a result, the outer bending point 6121 and the inner bending point 6111 are not on the same plane. The outer bending point 6121 and the inner bending point 6111 are staggered. In this way, the outer bending point 6121 and the inner bending point 6111 will not interfere with each other. In the subsequent core-forming process, the tab at the outer bending point 6121 and the tab at the inner bending point 6111 will not interfere with each other and will not affect the bending of the tab.

[0089] In some embodiments, see continue to see Figure 4 and Figure 5 The extrusion end 410 extends to the side of the first plane away from the second forming part 300, and the first plane is the plane where the forming gap 200 is located (i.e., Figure 4 (The plane shown in D).

[0090] Specifically, the extrusion end 410 extends to the side of the first plane away from the second forming part 300, so that the outer bending point 6121 formed by the extrusion end 410 also protrudes from the first plane. As a result, the outer bending point 6121 and the inner bending point 6111 are not on the same plane. The outer bending point 6121 and the inner bending point 6111 are staggered. In this way, the outer bending point 6121 and the inner bending point 6111 will not interfere with each other. In the subsequent core-forming process, the tab at the outer bending point 6121 and the tab at the inner bending point 6111 will not interfere with each other and will not affect the bending of the tab.

[0091] In some embodiments, see continue to see Figure 4 The centerline of the thickness direction of cell 600 is the first axis (i.e. Figure 4 As shown by line C in the diagram, the extrusion end 410 is located between the first axis and the first plane. This ensures that the outer bending point 6121 formed by the extrusion end 410 is located between the first axis and the first plane. This ensures that the outer bending point 6121 and the inner bending point 6111 are not on the same plane and will not interfere with each other. It also ensures that the inward extrusion size of the outer bending point 6121 formed by the extrusion end 410 is appropriate and will not affect the subsequent welding of the outer tab assembly 612.

[0092] If the extrusion end 410 protrudes beyond the first axis, then the outer bending point 6121 formed by the extrusion end 410 will also protrude beyond the first axis. This will cause the outer bending point 6121 to be extruded inward too much, and the outer tab group 612 to be retracted inward too much. Consequently, the length of the outer tab group 612 within the shaping gap 200 will be too small, which will result in the solder area 620 of the outer tab group 612 being unable to be effectively soldered, affecting the soldering quality and thus affecting the performance of the cell 600.

[0093] Figure 6 A schematic diagram of the third shaping device is shown. Figure 7 A schematic diagram of the structure is shown when the third shaping device is used to shape the tabs of the battery cell 600.

[0094] In some embodiments, see Figure 6 and Figure 7 As shown, the electrode structure 610 includes multiple electrodes. The multiple electrodes located on the side of the first plane closer to the first shaping member 100 are called the inner electrode group 611, located on the first plane (i.e., Figure 7 The multiple tabs (as shown in plane D) near the second shaping member 300 are called the outer tab group 612. The pre-folded portion 400 is connected to the base 500 near the second shaping member 300, and the pre-folded portion 400 can be folded along the thickness direction of the cell 600 (i.e., Figure 7(As shown in B) Move towards the outer tab group 612 to compress the outer tab group 612 and form an outer bending point 6121, or move away from the outer tab group 612 to move away from the outer tab group 612.

[0095] Specifically, the pre-folded portion 400 is connected to the side of the base 500 near the second shaping member 300 via the drive structure 700. The drive structure 700 includes a fixing member 710 and a drive member 720. The fixing member 710 is connected to the side of the base 500 away from the battery cell 600 body, and the drive member 720 is connected to the side of the fixing member 710 near the second shaping member 300. The drive member 720 is located between the base 500 and the second shaping member 300.

[0096] The driving member 720 has a pre-folded portion 400 on the side near the first shaping member 100, so that the pre-folded portion 400 is located between the base 500 and the second shaping member 300. The driving member 720 can drive the pre-folded portion 400 so that the pre-folded portion 400 can be folded along the thickness direction of the cell 600 (i.e., Figure 7 The pre-folded portion 400 moves towards the outer tab group 612 in the direction shown in B, thereby compressing the outer tab group 612 and forming an outer bending point 6121. After the compression is completed, the drive member 720 continues to drive the pre-folded portion 400 to move away from the outer tab group 612.

[0097] Thus, the compression and retraction of the pre-folded portion 400 onto the outer tab group 612 and the compression and retraction of the second shaping component 300 onto the outer tab group 612 are two independent steps, with no necessary correlation between them. This enhances the flexibility of the compression and retraction step of the pre-folded portion 400 onto the outer tab group 612, allowing for flexible control of the compression and retraction of the pre-folded portion 400 onto the outer tab group 612 at different times and according to different needs during actual use.

[0098] Figure 8 A first structural schematic diagram is shown during the process of simultaneously shaping the tab structure 610 of four battery cells 600.

[0099] See Figures 1 to 8 As shown, this application also provides a method for shaping the tabs of a battery cell 600. The battery cell 600 includes a battery cell 600 body and a tab structure 610 extending from the battery cell 600 body along a first direction.

[0100] The methods include:

[0101] Step S100: Provide the shaping device according to any of the above embodiments;

[0102] Step S200: Based on the shaping device, the tab structure 610 is shaped so that the outer tab group 612 of the tab structure 610 is brought closer to the inner tab group 611 to form an outer bending point 6121, and the inner tab group 611 of the tab structure 610 is brought closer to the outer tab group 612 to form an inner bending point 6111.

[0103] The electrode structure 610 includes multiple electrodes. The multiple electrodes located on the side of the first plane close to the first shaping member 100 are called the inner electrode group 611, and the multiple electrodes located on the side of the first plane close to the second shaping member 300 are called the outer electrode group 612. The first plane is the plane where the shaping gap 200 is located.

[0104] In the first direction, the minimum distance between the outer bending point 6121 and the body of the cell 600 is less than the minimum distance between the inner bending point 6111 and the body of the cell 600; in the thickness direction of the cell 600, the outer bending point 6121 is located on the side of the inner bending point 6111 that is away from the second forming member 300.

[0105] In practice, during the closing process, the tab structure 610 of only one cell 600 can be closed, or the tab structures 610 of two cells 600 can be closed simultaneously (e.g., Figure 5 and Figure 7 As shown), it can also simultaneously compress the structure of four 600-cell batteries (as shown). Figure 8 (As shown).

[0106] The shaping device shapes the tab structure 610, causing the outer tab group 612 of the tab structure 610 to be drawn closer to the inner tab group 611 to form an outer bending point 6121, and causing the inner tab group 611 of the tab structure 610 to be drawn closer to the outer tab group 612 to form an inner bending point 6111.

[0107] In the first direction (i.e.) Figure 7 In the direction shown in A, the minimum distance between the outer bending point 6121 and the body of the cell 600 is less than the minimum distance between the inner bending point 6111 and the body of the cell 600. This makes the area on the outer tab group 612 that is not squeezed and gathered smaller, that is, the area on the outer tab group 612 that is squeezed and gathered larger. This allows for better gathering of each tab in the outer tab group 612, making the area of ​​the tabs that can move freely in the outer tab group 612 smaller during subsequent core assembly. This can reduce or even eliminate the possibility of the outer tab group 612 bulging outward, and thus effectively solve the problem of the outer tab group 612 being inserted.

[0108] In the thickness direction of cell 600 (i.e. Figure 7In the direction shown in B, the outer bending point 6121 is located on the side of the inner bending point 6111 away from the second forming part 300, so that the outer bending point 6121 and the inner bending point 6111 are not on the same plane. The outer bending point 6121 and the inner bending point 6111 are staggered, so that the outer bending point 6121 and the inner bending point 6111 will not interfere with each other. In the subsequent core-joining process, the tab at the outer bending point 6121 and the tab at the inner bending point 6111 will not interfere with each other and will not affect the bending of the tab.

[0109] In some embodiments, step S200 involves shaping the tab structure 610 using a shaping device, causing the outer tab group 612 of the tab structure 610 to converge toward the inner tab group 611 to form an outer bending point 6121, and causing the inner tab group 611 of the tab structure 610 to converge toward the outer tab group 612 to form an inner bending point 6111, including:

[0110] The battery cell 600 is placed on the base 500, and the tab structure 610 is placed on the second shaping component 300, with the outer tab assembly 612 attached to the second shaping component 300.

[0111] Based on the second shaping component 300 and the pre-folding part 400, the outer electrode group 612 is shaped so that the outer electrode group 612 is folded towards the inner electrode group 611 to form an outer bending point 6121.

[0112] The inner tab group 611 is shaped by the first shaping component 100, so that the inner tab group 611 is brought closer to the outer tab group 612 to form an inner bending point 6111.

[0113] Specifically, the outer tab assembly 612 is shaped based on the second shaping member 300 and the pre-folding part 400. In this way, the outer tab assembly 612 can be double-compressed by the second shaping member 300 and the pre-folding part 400, so that the outer tab assembly 612 is gathered towards the inner tab assembly 611 to form an outer bending point 6121. The double compression and gathering makes the area of ​​the outer tab assembly 612 that is compressed and gathered larger, so that the area of ​​the tab that can move freely in the outer tab assembly 612 during subsequent core assembly is smaller, which can reduce or even eliminate the possibility of the outer tab assembly 612 bulging outward, thereby effectively solving the problem of the outer tab assembly 612 being inserted inward.

[0114] The inner tab assembly 611 is shaped by the first shaping component 100. In this way, the inner tab assembly 611 can be squeezed by the first shaping component 100 so that the inner tab assembly 611 is gathered towards the outer tab assembly 612 to form an inner bending point 6111. This can prevent the inner tab assembly 611 from bulging outward during subsequent core assembly, thereby preventing the inner tab assembly 611 from being inserted inward.

[0115] In this application, the outer tab assembly 612 is shaped by the second shaping member 300 and the pre-folding part 400, and the inner tab assembly 611 is shaped by the first shaping member 100. This allows both the inner tab assembly 611 and the outer tab assembly 612 to be shaped, and the outer tab assembly 612 is shaped and gathered in a larger area. This ensures that neither the outer tab assembly 612 nor the inner tab assembly 611 will bulge outwards during subsequent core assembly, thus preventing the tabs from being inserted into the core.

[0116] In some embodiments, shaping the outer tab assembly 612 based on the second shaping member 300 and the pre-folded portion 400 to bring the outer tab assembly 612 closer to the inner tab assembly 611 to form an outer bending point 6121 includes: driving the second shaping member 300 to move closer to the first shaping member 100 to move the pre-folded portion 400 closer to the outer tab assembly 612 and causing the pressing end 410 to press the outer tab assembly 612 to form an outer bending point 6121.

[0117] Specifically, the second shaping member 300 is driven to move closer to the first shaping member 100, thereby causing the pre-folded portion 400 to move closer to the outer tab assembly 612 and causing the pressing end 410 to press the outer tab assembly 612 to form an outer bending point 6121. Thus, when the second shaping member 300 shapes the outer tab assembly 612 of the tab structure 610, the pressing end 410 protruding from the second shaping member 300 can further press and shape the outer tab assembly 612 to form the outer bending point 6121 on the outer tab assembly 612. In this way, the initial shaping by the second shaping member 300 and the further shaping by the pre-folded portion 400 can be performed simultaneously, reducing the number of shaping steps and lowering the complexity of the shaping operation.

[0118] In some embodiments, the inner tab assembly 611 is shaped based on the first shaping member 100, causing the inner tab assembly 611 to converge toward the outer tab assembly 612 to form an inner bending point 6111, including:

[0119] The first shaping member 100 is driven to move closer to the second shaping member 300, so that the first shaping member 100 squeezes the inner tab group 611, causing the inner tab group 611 to shrink closer to the outer tab group 612 to form an inner bending point 6111. In this way, the inner tab group 611 can be squeezed by the first shaping member 100, which can prevent the inner tab group 611 from bulging outward during subsequent core assembly, thereby preventing the inner tab group 611 from being inserted inward.

[0120] Figure 9 A schematic diagram of the structure after four 600 battery cells are shaped, welded, and joined together is shown.

[0121] In some embodiments, after shaping the inner tab assembly 611 based on the first shaping member 100, the method further includes welding the tab structure 610 to form a welded portion 630, wherein the orthographic projection of the welded portion 630 on the first plane does not coincide with the orthographic projections of the outer bending point 6121 and the inner bending point 6111 on the first plane.

[0122] Specifically, after shaping the tab structure 610, the tab structure 610 is welded to complete the welding between each electrode piece in the tab structure 610 and the tab structure 610 and the cover plate 800 and / or the adapter piece.

[0123] In this application, the tab structure 610 is shaped before it is welded. This method of shaping before welding ensures that the shaping process is not affected by welding. The area and range of the tab structure 610 that can be shaped are larger, which allows for double shaping of the outer tab assembly 612, improving the shaping effect and ensuring that the tabs will not be inserted into the core during subsequent core assembly.

[0124] The orthographic projection of the welding part 630 on the first plane does not coincide with the orthographic projections of the outer bending point 6121 and the inner bending point 6111 on the first plane. This ensures that the presence of the inner bending point 6111 and the outer bending point 6121 will not affect the welding process, thus ensuring the welding effect.

[0125] In some embodiments, the centerline of the cell 600 in the thickness direction is the first axis (i.e., Figure 8 The center line of the welding part 630 in the thickness direction of the cell 600 (as shown by line C) is the second axis (i.e., Figure 8 As shown in line F, in the thickness direction of the cell 600, the second axis is located on the side of the first axis closer to the second shaping part 300, that is, the second axis is not flush with the second axis. The welding part 630 is not exactly on the center line of the thickness of the cell 600. The welding part 630 is set closer to the second shaping part 300. In this way, the welding part 630 and the center line of the thickness of the cell 600 are staggered, which is more conducive to the formation of the staggered inner bending point 6111 and outer bending point 6121, and facilitates the shaping process.

[0126] In some embodiments, see continue to see Figure 9 As shown, after welding the tab structure 610 to form the welded part 630, the method further includes: driving the base 500 to rotate so that the base 500 drives the cell 600 to rotate toward the first shaping member 100, until the center line of the thickness direction of the cell 600 is perpendicular to the first direction.

[0127] Specifically, after the shaping and welding processes are completed, the first shaping component 100 is removed, and then the base 500 is driven to rotate, causing the base 500 to rotate the battery cell 600 towards the first shaping component 100, until the center line of the thickness direction of the battery cell 600 is perpendicular to the first direction. At this point, the battery cell 600 is joined together. The structural diagram of the four battery cells 600 after shaping, welding, and joining together is shown below. Figure 9 As shown.

[0128] In this application, the core-joining process is carried out only after the shaping and welding processes are completed. Since the tab structure 610 has been shaped before core-joining and the outer tab group 612 has been double-shaped, it can be ensured that the tabs will not bulge outward during and after core-joining, thus preventing the tabs from being inserted into the core.

[0129] Figure 10 This shows a second structural schematic diagram during the process of simultaneously shaping the tab structure 610 of four battery cells 600. Figure 11 A schematic diagram of the third structure is shown during the process of simultaneously shaping the tab structure 610 of four cells 600.

[0130] In some embodiments, see Figure 10 and Figure 11 As shown, the electrode structure 610 is shaped using a shaping device, causing the outer electrode group 612 of the electrode structure 610 to converge towards the inner electrode group 611 to form an outer bending point 6121, and causing the inner electrode group 611 of the electrode structure 610 to converge towards the outer electrode group 612 to form an inner bending point 6111, including:

[0131] The battery cell 600 is placed on the base 500, and the tab structure 610 is placed in the shaping gap 200 between the first shaping member 100 and the second shaping member 300, and the outer tab assembly 612 is attached to the second shaping member 300.

[0132] Drive the first shaping member 100 to move closer to the second shaping member 300, so that the first shaping member 100 squeezes the inner tab group 611, and causes the inner tab group 611 to fold closer to the outer tab group 612 to form an inner bending point 6111.

[0133] The base 500 is driven to rotate so that the base 500 drives the cell 600 to rotate toward the first shaping part 100, and the angle between the first axis and the first direction is determined in real time. The first axis is the center line of the thickness direction of the cell 600.

[0134] In response to the included angle reaching the first preset included angle, the pre-folded portion 400 is driven to move along the thickness direction of the cell 600 toward the direction close to the outer tab group 612, so as to squeeze the outer tab group 612 and cause the outer tab group 612 to fold toward the direction close to the inner tab group 611 to form an outer bending point 6121.

[0135] Specifically, the first shaping member 100 is first driven to move closer to the second shaping member 300, so that the first shaping member 100 squeezes the inner tab group 611, so that the inner tab group 611 is gathered closer to the outer tab group 612 to form an inner bending point 6111. This can prevent the inner tab group 611 from bulging outward during subsequent core assembly, thereby preventing the inner tab group 611 from being inserted inward.

[0136] Then, the tab structure 610 is welded.

[0137] Then, the base 500 is driven to rotate, so that the base 500 drives the battery cell 600 to rotate closer to the first shaping member 100, and the first axis is determined in real time (i.e., Figure 11 The line shown in C) and the first direction (i.e. Figure 11 The angle between (direction A shown in the diagram) and (direction A). The process of determining the angle can be done manually or based on sensors or angle measuring tools, and is not limited here.

[0138] It is worth noting that the first shaping component 100 needs to be removed before or during the rotation of the drive base 500 to avoid the first shaping component 100 affecting the cell 600's core bonding.

[0139] When the included angle reaches the first preset included angle, the drive pre-folding part 400 moves along the thickness direction of the cell 600 toward the direction close to the outer tab group 612 to squeeze the outer tab group 612, so that the outer tab group 612 is folded toward the direction close to the inner tab group 611 to form an outer bending point 6121.

[0140] The first preset angle is the angle between the preset start-up pre-fold 400 and the outer tab assembly 612 during shaping. For example, the first preset angle can be 30° to 50°. Preferably, the first preset angle can be 45°.

[0141] When the included angle reaches the first preset included angle, it is necessary to drive the pre-folding part 400 to straighten the outer tab group 612. At this time, the outer tab group 612 can be squeezed and shaped in time to ensure that the outer tab group 612 will not bulge outward during the core closing process and will not be inserted inward.

[0142] If the pre-folding section 400 is started when the included angle is less than the first preset included angle, the closing angle of the battery cell 600 is too small, and the pre-folding section 400 may not be able to squeeze the outer tab group 612 well. If the pre-folding section 400 is started when the included angle is greater than the first preset included angle, the closing angle of the battery cell 600 is too large, and the outer tab group 612 may have already bulged outward before the pre-folding section 400 is started, which is not conducive to the squeezing and shaping of the pre-folding section 400 and may affect the shaping effect of the outer tab group 612.

[0143] In some embodiments, the method further includes: in response to the included angle reaching a second preset included angle, driving the pre-folded portion 400 to move away from the outer tab group 612 along the thickness direction of the cell 600, so as to move away from the outer tab group 612, while stopping the rotation of the driving base 500; wherein the second preset included angle is greater than the first preset included angle.

[0144] Specifically, the second preset angle is the angle at the end of the core-combining process. The second preset angle is greater than the first preset angle. For example, the second preset angle can be 90°.

[0145] As the base 500 drives the battery cell 600 to rotate, the pre-folding part 400 continuously squeezes the outer tab group 612 to shape the outer tab group 612 during the core-closing process. This ensures that the outer tab group 612 is squeezed and shaped by the pre-folding part 400 throughout the entire core-closing process, ensuring that the outer tab group 612 does not bulge outward.

[0146] When the included angle reaches the second preset included angle, the core joining is complete, and there is no need to continue pressing and shaping the outer tab group 612. Therefore, the drive pre-folding part 400 moves away from the outer tab group 612 along the thickness direction of the cell 600, and at the same time, the drive base 500 stops rotating. At this point, the core joining is complete. The structural diagram of the four cells 600 after shaping, welding and joining is shown in the figure. Figure 9 As shown.

[0147] Figure 12 A schematic diagram of the cell 600 is shown with an adhesive 900 provided on the outside of the tab structure 610.

[0148] In some embodiments, see Figure 12 As shown, among the multiple tabs of the tab structure 610, the tab that contacts the first shaping member 100 is the first tab 613, and the tab that contacts the second shaping member 300 is the second tab 614. Both the first tab 613 and the second tab 614 include a solder area 620. Before the tab structure 610 is shaped by the shaping device, the following steps are also included:

[0149] On the side of the first tab 613 away from the first shaping member 100 and on the side of the second tab 614 away from the second shaping member 300, an adhesive member 900 is attached; wherein the orthographic projection of the adhesive member 900 on the first plane does not coincide with the orthographic projection of the solder area 620 on the first plane, and the first plane is the plane where the shaping gap 200 is located.

[0150] Specifically, an adhesive member 900 is attached to the side of the first tab 613 away from the first shaping member 100 and the side of the second tab 614 away from the second shaping member 300. The adhesive member 900 can fix the first tab 613 and the second tab 614 in place. During the core assembly process, the adhesive member 900 can also exert an inward squeezing effect to further prevent the tabs from protruding outward during the core assembly process, so as to avoid the tabs being inserted into the core.

[0151] The orthographic projection of the adhesive component 900 on the first plane does not coincide with the orthographic projection of the solder area 620 on the first plane. This ensures that the setting of the adhesive component 900 will not affect the subsequent welding process and ensures the welding quality.

[0152] This application also provides a battery cell, characterized in that the battery cell includes a tab structure 610 shaped by the shaping method based on any of the above embodiments.

[0153] Specifically, a battery cell is used to provide electrical energy to an electrical device. The battery cell can be used as a power source for the electrical device or as an energy storage unit for the device. Electrical devices can include, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0154] The battery cells have the technical effects of any of the above embodiments, which will not be elaborated here.

[0155] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0156] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the above embodiments of this application, which are not provided in detail for the sake of brevity.

[0157] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A shaping device for battery cell tabs, the battery cell comprising a battery cell body and tab structures extending from the battery cell body along a first direction, characterized in that, The shaping device includes: The first shaping member and the second shaping member are arranged opposite to each other, and there is a shaping gap between the first shaping member and the second shaping member for accommodating the electrode structure. In the first direction, the minimum distance from the second shaping member to the cell body is less than the minimum distance from the first shaping member to the cell body. The base, located on the same side of the battery cell body as the second shaping component, is used to support the battery cell body; The pre-folded portion is connected to the second shaping member or the base. The pre-folded portion is used to pre-shape the tab structure so that the tab structure forms an outward bending point.

2. The shaping device according to claim 1, characterized in that, The pre-folded portion is connected to the end of the second shaping member near the cell body. The pre-folded portion extends along the thickness direction of the cell. The pre-folded portion includes a pressing end near the tab structure, and the pressing end protrudes from the second shaping member.

3. The shaping device according to claim 2, characterized in that, The extrusion end extends to the side of the first plane away from the second shaping part, and the first plane is the plane where the shaping gap is located.

4. The shaping device according to claim 3, characterized in that, The centerline of the cell in the thickness direction is the first axis, and the extrusion end is located between the first axis and the first plane.

5. The shaping device according to claim 3, characterized in that, The electrode structure includes multiple electrodes. The multiple electrodes located on the side of the first plane closer to the first shaping member are called the inner electrode group, and the multiple electrodes located on the side of the first plane closer to the second shaping member are called the outer electrode group. The pre-folded portion is connected to the side of the base near the second shaping member. The pre-folded portion can move along the thickness direction of the cell towards the outer tab group to squeeze the outer tab group and form the outer bending point, or move away from the outer tab group to move away from the outer tab group.

6. A method for shaping a battery cell tab, the battery cell comprising a battery cell body and a tab structure extending from the battery cell body along a first direction, characterized in that, The method includes: Provide a shaping device according to any one of claims 1 to 5; The shaping device shapes the tab structure, causing the outer tab group of the tab structure to converge toward the inner tab group to form an outer bending point, and causing the inner tab group of the tab structure to converge toward the outer tab group to form an inner bending point. The electrode structure includes multiple electrodes. The multiple electrodes located on the side of the first plane closer to the first shaping member are called the inner electrode group, and the multiple electrodes located on the side of the first plane closer to the second shaping member are called the outer electrode group. The first plane is the plane where the shaping gap is located. In the first direction, the minimum distance between the outer bending point and the cell body is less than the minimum distance between the inner bending point and the cell body. In the thickness direction of the battery cell, the outer bending point is located on the side of the inner bending point away from the second shaping member.

7. The shaping method according to claim 6, characterized in that, The shaping of the electrode structure based on the shaping device, causing the outer electrode group of the electrode structure to converge towards the inner electrode group to form an outward bending point, and causing the inner electrode group of the electrode structure to converge towards the outer electrode group to form an inward bending point, includes: The battery cell is placed on the base, and the tab structure is placed on the second shaping component, with the outer tab assembly fitting against the second shaping component; Based on the second shaping component and the pre-folded portion, the outer tab group is shaped so that the outer tab group is brought closer to the inner tab group to form an outward bending point. The inner tab group is shaped based on the first shaping component, so that the inner tab group is brought closer to the outer tab group to form an inner bending point.

8. The shaping method according to claim 7, characterized in that, The pre-folded portion is connected to the end of the second shaping member near the cell body. The pre-folded portion includes a pressing end near the tab structure, and the pressing end protrudes from the second shaping member. The shaping of the outer tab assembly based on the second shaping member and the pre-folded portion, causing the outer tab assembly to converge towards the inner tab assembly to form an outward bending point, includes: The second shaping component is driven to move closer to the first shaping component, thereby causing the pre-folded portion to move closer to the outer tab assembly and causing the extrusion end to extrude the outer tab assembly to form an outer bending point.

9. The shaping method according to claim 7, characterized in that, The step of shaping the inner tab assembly based on the first shaping member, causing the inner tab assembly to converge towards the outer tab assembly to form an inner bending point, includes: The first shaping member is driven to move closer to the second shaping member, so that the first shaping member squeezes the inner tab group, causing the inner tab group to converge closer to the outer tab group to form an inner bending point.

10. The shaping method according to claim 7, characterized in that, After shaping the inner tab assembly based on the first shaping element, the process further includes: The electrode structure is welded to form a welded part, and the orthographic projection of the welded part on the first plane does not coincide with the orthographic projection of the outer bending point and the inner bending point on the first plane.

11. The shaping method according to claim 10, characterized in that, The centerline of the battery cell in the thickness direction is the first axis, and the centerline of the welding part in the thickness direction of the battery cell is the second axis. In the thickness direction of the battery cell, the second axis is located on the side of the first axis closer to the second shaping part.

12. The shaping method according to claim 10, characterized in that, After welding the electrode structure to form a welded portion, the process further includes: The base is driven to rotate, so that the base drives the battery cell to rotate towards the first shaping component, until the center line of the battery cell in the thickness direction is perpendicular to the first direction.

13. The shaping method according to claim 7, characterized in that, The pre-folded portion is connected to the side of the base near the second shaping member. The pre-folded portion can move along the thickness direction of the cell towards the outer tab group to squeeze the outer tab group, or move away from the outer tab group to move away from the outer tab group. The shaping of the electrode structure based on the shaping device, causing the outer electrode group of the electrode structure to converge towards the inner electrode group to form an outward bending point, and causing the inner electrode group of the electrode structure to converge towards the outer electrode group to form an inward bending point, includes: The battery cell is placed on the base, and the electrode structure is placed in the shaping gap between the first shaping component and the second shaping component, with the outer electrode assembly fitting against the second shaping component; Drive the first shaping member to move closer to the second shaping member, so that the first shaping member squeezes the inner tab group, and the inner tab group is brought together closer to the outer tab group to form an inner bending point. The base is driven to rotate so that the base drives the battery cell to rotate toward the first shaping component, and the angle between the first axis and the first direction is determined in real time. The first axis is the center line of the thickness direction of the battery cell. In response to the included angle reaching a first preset included angle, the pre-folded portion is driven to move along the thickness direction of the battery cell towards the outer tab group to squeeze the outer tab group, causing the outer tab group to fold towards the inner tab group to form an outer bending point.

14. The shaping method according to claim 13, characterized in that, The method further includes: In response to the included angle reaching a second preset included angle, the pre-folded portion is driven to move away from the outer tab group along the thickness direction of the battery cell, so as to move away from the outer tab group, while the rotation of the base is stopped; wherein, the second preset included angle is greater than the first preset included angle.

15. The shaping method according to claim 1, characterized in that, Among the multiple tabs of the tab structure, the tab that contacts the first shaping component is the first tab, and the tab that contacts the second shaping component is the second tab. Both the first tab and the second tab include a solder area. Before the shaping of the electrode structure based on the shaping device, the method further includes: Adhesive pieces are attached to the side of the first electrode tab away from the first shaping member and the side of the second electrode tab away from the second shaping member; Wherein, the orthographic projection of the adhesive on the first plane does not coincide with the orthographic projection of the solder area on the first plane, and the first plane is the plane where the shaping gap is located.

16. A single battery cell, characterized in that, The battery cell includes a tab structure shaped according to the shaping method described in claims 6 to 15.

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