Shell punching die and shell punching equipment

Abstract

The utility model provides a shell punching die and shell punching equipment, the shell punching die comprises a first die plate and a punch assembly, the first die plate is provided with a first groove in the first direction, and the first groove comprises a first avoiding area and a second avoiding area; the punch assembly is located on the side, provided with the first groove, of the first die plate in the first direction, the punch assembly comprises a punch body and a protruding part, the protruding part is connected to one side of the punch body in the second direction, and the second direction is perpendicular to the first direction; in the first direction, the punch body is projected into the first avoiding area, and the protruding part is projected into the second avoiding area. The shell punching die is used for punching the shell to produce the aluminum plastic film capable of accommodating the false tab structure, and is beneficial to ensuring the reliability of the battery. The shell punching equipment comprises a driving device and the shell punching die, the driving device is used for driving the shell punching die to conduct shell punching operation, and the aluminum plastic film capable of improving the reliability of the battery is produced.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and particularly relates to a shell punching die and a shell punching device. Background Art

[0002] After multiple charge and discharge cycles, lithium plating is likely to occur in the battery. Lithium plating in the battery will affect the performance and lifespan of the battery. Currently, a dummy tab structure is usually provided at the positive electrode and / or negative electrode of the battery to improve the uniformity of current distribution inside the battery and thus improve the lithium plating phenomenon. The problem is that the dummy tab structure has a certain thickness. Affected by the dummy tab structure, defects such as abnormal packaging thickness are likely to occur during the encapsulation of the battery core, affecting the performance of the battery. Summary of the Utility Model

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present application provides a shell punching die for producing an aluminum-plastic film capable of accommodating a dummy tab structure, which is beneficial to ensuring the reliability of battery encapsulation.

[0004] The present application also provides a shell punching device having the above shell punching die.

[0005] According to an embodiment of the present application, the shell punching die includes a first template and a punch assembly;

[0006] The first template is provided with a first groove along a first direction. The first groove includes a first avoidance area and a second avoidance area;

[0007] Along the first direction, the punch assembly is located on one side of the first template where the first groove is provided. The punch assembly includes a punch body and a protruding portion. Along a second direction perpendicular to the first direction, the protruding portion is connected to one side of the punch body;

[0008] Wherein, along the first direction, the projection of the punch body is within the first avoidance area, and the projection of the protruding portion is within the second avoidance area. The punch body is used to punch at least part of the packaging material into the first avoidance area to form a battery core main body groove, and the protruding portion is used to punch at least part of the packaging material into the second avoidance area to form a dummy tab groove.

[0009] According to an embodiment of the present application, the shell punching die has at least the following beneficial effects: The first template is used to carry the packaging material, the punch assembly is used to punch the packaging material, and the first groove is used to avoid the punch assembly and the packaging material during punching to ensure the deformation of the packaging material. The punch body is used to punch at least part of the packaging material into the first avoidance area to form a battery core main body groove, and the protruding portion is used to punch at least part of the packaging material into the second avoidance area to form a dummy tab groove. The battery core main body groove is used to accommodate the battery core main body, and the dummy tab groove is used to accommodate the dummy tab structure, realizing the clearance of the dummy tab structure, effectively avoiding the adverse effects of the dummy tab structure on battery encapsulation, and being beneficial to ensuring the safety and reliability of the battery.

[0010] According to some embodiments of the present application, the shell punching die further includes a second template. The second template is provided with a second groove. Part of the punch body and the convex portion are located in the second groove, and the punch body and the convex portion located in the second groove are arranged to match the shape of the second groove. Along the first direction, the first template is located on the side where the punch assembly is exposed outside the second groove.

[0011] According to some embodiments of the present application, along the first direction, a first abutting surface is provided on the side of the punch body facing the first template, and a second abutting surface is provided on the side of the convex portion facing the first template, and there is a height difference between the first abutting surface and the second abutting surface;

[0012] Wherein, the punch assembly is configured to approach the first template along the first direction so that the first abutting surface and the second abutting surface sequentially abut against the encapsulating material.

[0013] According to some embodiments of the present application, along the second direction, a plurality of convex portions are connected to one side of the punch body, and the plurality of convex portions are arranged at intervals along the third direction. The third direction is perpendicular to the first direction and perpendicular to the second direction.

[0014] According to some embodiments of the present application, the punch assembly further includes an airbag punch. Along the third direction, the airbag punch is located on one side of the punch body. The first template is further provided with a third groove. Along the first direction, the airbag punch is projected into the third groove. The third direction is perpendicular to the first direction and perpendicular to the second direction.

[0015] According to some embodiments of the present application, there are a plurality of airbag punches, and the plurality of airbag punches are arranged at intervals along the second direction.

[0016] According to some embodiments of the present application, the shell punching die further includes a second template. Along the first direction, the second template is further provided with a fourth groove. Part of the airbag punches are located in the fourth groove, and the part of the airbag punches located in the fourth groove matches the shape of the fourth groove.

[0017] According to some embodiments of the present application, the shell punching die further includes a second template. Along the first direction, the punch assembly is movably connected to the second template, and at least a part of the punch assembly protrudes outside the second template toward the first template.

[0018] According to some embodiments of the present application, the punch assembly further includes a connecting piece and an airbag punch. The punch body and the airbag punch are both connected to the connecting piece, and the punch body and the airbag punch are movably connected to the second template.

[0019] The shell punching device according to the embodiment of the second aspect of the present application includes a driving device and the shell punching die in any of the above embodiments. The shell punching die is connected to the driving device, and the driving device is used to drive the first template and the punch assembly to approach or move away from each other.

[0020] The shell punching device according to the embodiment of the present application has at least the following beneficial effects: The driving device is used to drive the shell punching die to perform the shell punching operation to produce an aluminum-plastic film that can improve the reliability of the battery, which is beneficial to improving the efficiency of the shell punching operation.

[0021] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0022] The following further describes the present application with reference to the drawings and embodiments, where:

[0023] Figure 1 is a schematic structural diagram of the aluminum-plastic film according to the embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of the punch assembly according to the embodiment of the present application;

[0025] Figure 3 is an exploded view of the shell punching die according to the embodiment of the present application;

[0026] Figure 4 is a side view of the punch body and the convex portion according to the embodiment of the present application;

[0027] Figure 5 is Figure 1 a cross-sectional view taken along line A-A in ;

[0028] Figure 6 is Figure 5 a partially enlarged schematic view at A in ;

[0029] Figure 7 is a schematic structural diagram of the punch body and the convex portion according to another embodiment of the present application;

[0030] Figure 8 is a schematic structural diagram of the aluminum-plastic film according to another embodiment of the present application.

[0031] Reference numerals: first template 100, first groove 110, first avoidance area 111, second avoidance area 112, third groove 120;

[0032] second template 200, second groove 210, fourth groove 220;

[0033] Punch assembly 300, punch body 310, first abutting surface 311, protruding portion 320, second abutting surface 321, airbag punch 330, connecting member 340;

[0034] Aluminum-plastic film 400, main battery cell groove 410, dummy tab groove 420, airbag groove 430. Detailed implementation manners

[0035] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for facilitating the description of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0037] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0038] In the description of the present application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0039] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0040] The embodiments of the present application will be introduced below in conjunction with the accompanying drawings of the specification:

[0041] Refer toFigures 1 to 3 According to the shell punching die of an embodiment of the present application, it includes a first template 100 and a punch assembly 300. The first template 100 is provided with a first groove 110 along a first direction. The first groove 110 includes a first avoidance area 111 and a second avoidance area 112. Along the first direction, the punch assembly 300 is located on one side of the first template 100 where the first groove 110 is provided. The punch assembly 300 includes a punch main body 310 and a protrusion 320. Along a second direction perpendicular to the first direction, the protrusion 320 is connected to one side of the punch main body 310. Along the first direction, the projection of the punch main body 310 is within the first avoidance area 111, and the projection of the protrusion 320 is within the second avoidance area 112. The punch main body 310 is used to punch at least part of the packaging material into the first avoidance area 111 to form a battery cell main body groove 410, and the protrusion 320 is used to punch at least part of the packaging material into the second avoidance area 112 to form a false tab groove 420. The packaging material may be an aluminum plastic film 400.

[0042] Wherein, when punching the packaging material, the groove wall of the first groove 110 cooperates with the punch main body 310 and the protrusion 320 to cause the aluminum plastic film 400 to deform, forming the battery cell main body groove 410 and the false tab groove 420. The battery cell main body groove 410 is used to accommodate the battery cell main body, and the false tab groove 420 is used to accommodate the false tab structure. The aluminum plastic film 400 punched by the shell punching die of the present application can accommodate the false tab structure, making the packaging thickness of the battery cell more uniform and the structure more compact, which is beneficial to ensuring the packaging performance of the battery cell.

[0043] Specifically, the first template 100 and the punch assembly 300 can approach or move away from each other along the first direction. The aluminum plastic film 400 is placed on the first template 100, and the aluminum plastic film 400 covers the first groove 110. The punch assembly 300 approaches the first template 100 to punch the position of the aluminum plastic film 400 corresponding to the first groove 110. Part of the punch main body 310 and the protrusion 320 punch part of the aluminum plastic film 400 into the first groove 110. The position where the aluminum plastic film 400 abuts against the punch main body 310 deforms to form the battery cell main body groove 410, and the position where the aluminum plastic film 400 abuts against the protrusion 320 forms the false tab groove 420. The punch main body 310 and the protrusion 320 are connected, so that the battery cell main body groove 410 is communicated with the false tab groove 420. After the shell punching is completed, the punch assembly 300 and the first template 100 move away from each other, which is convenient for removing the aluminum plastic film 400 and, moreover, re-placing the un-shelled aluminum plastic film 400. The shell punching die is used to produce the aluminum plastic film 400 with the battery cell main body groove 410 and the false tab groove 420. Encapsulating the battery cell with this aluminum plastic film 400 is beneficial to improving the packaging quality of the battery and ensuring the safety and reliability of the battery.

[0044] It should be noted that the packaged battery cell includes at least a battery cell body and a fake pole ear structure, which is connected to the battery cell. The battery cell body can be placed in the battery cell body groove 410, and the fake pole ear structure can be placed in the fake pole ear groove 420 to accommodate the battery cell body and the fake pole ear structure. The battery cell body and the fake pole ear structure have different packaging thicknesses. The aluminum-plastic film 400 formed by stamping with a shell punching mold can avoid the interference of the fake pole ear structure on the battery cell packaging operation, so that the packaging thickness of each part of the packaged battery is more uniform, avoiding poor packaging phenomena such as air leakage and liquid leakage.

[0045] refer to Figures 1 to 3 In some embodiments, the punching die further comprises a second template 200, the second template 200 is provided with a second groove 210, part of the punch body 310 and the protrusion 320 are located in the second groove 210, that is, a part of the punch body 310 is located in the second groove 210, and a part of the protrusion 320 is also located in the second groove 210. The punch body 310 and the protrusion 320 located in the second groove 210 match the shape of the second groove 210, and are used to position and limit the punch body 310 and the protrusion 320, so as to facilitate the positioning and installation of the punch body 310 and the protrusion 320, and the second groove 210 is used to limit the deflection or shaking of the punch body 310 and the protrusion 320 relative to the second template 200, so as to improve the precision of stamping. Along the first direction, the first template 100 is located on the side of the punch assembly 300 exposed in the second groove 210. When the first template 100 and the second template 200 approach each other along the first direction, the punch assembly 300 can punch the aluminum-plastic film 400 covering the first groove 110 to form the battery body groove 410 and the fake pole ear groove 420.

[0046] Specifically, the punch body 310 and the protrusion 320 include a portion located in the second groove 210 and a portion located outside the second groove 210. A portion of the punch body 310 and the protrusion 320 are located outside the second groove 210. The shape of the second groove 210 matches the shape setting of the punch body 310 and the protrusion 320. The punch body 310 and the protrusion 320 are both in contact with the groove wall of the second groove 210, which is used to limit the deflection or shaking of the punch body 310 and the protrusion 320 relative to the second template 200, thereby ensuring the molding accuracy of the aluminum-plastic film 400, thereby improving the packaging performance of the battery.

[0047] It should be noted that the second template 200 can drive the punch assembly 300 to move synchronously relative to the first template 100. Along the first direction, the projections of the punch body 310 and the convex portion 320 on the first template 100 are both located in the first groove 110. The shape of the first groove 110 is set to match the projection shapes of the punch body 310 and the convex portion 320 along the first direction. Both the punch body 310 and the convex portion 320 are in contact with the groove wall of the second groove 210, which is used to prevent the punch body 310 and the convex portion 320 from being skewed during stamping, ensuring the forming accuracy of the aluminum-plastic film 400 and being beneficial to improving the packaging performance of the battery.

[0048] Reference Figures 2 to 4 , in some embodiments, along the first direction, a first abutting surface 311 is provided on the side of the punch body 310 facing the first template 100, and a second abutting surface 321 is provided on the side of the convex portion 320 facing the first template 100. And along the first direction, there is a height difference a between the first abutting surface 311 and the second abutting surface 321. The punch assembly 300 is configured to approach the first template 100 along the first direction, so that the first abutting surface 311 and the second abutting surface 321 are in contact with the packaging material in sequence. The packaging material can be the aluminum-plastic film 400, that is, the first abutting surface 311 contacts the aluminum-plastic film 400 first, and then the second abutting surface 321 contacts the aluminum-plastic film 400. The first abutting surface 311 contacting the aluminum-plastic film 400 forms the core body groove 410, and the second abutting surface 321 contacting the aluminum-plastic film 400 forms the false tab groove 420. When punching the shell, the first abutting surface 311 contacts the aluminum-plastic film 400 first, so that the depth of the core body groove 410 is greater than the depth of the false tab groove 420. The core body groove 410 is used to accommodate the core body, and the false tab groove 420 is used to accommodate the false tab structure. Compared with the first abutting surface 311 and the second abutting surface 321 being in the same plane, it is beneficial to ensure the accommodation of the false tab structure by the aluminum-plastic film 400 formed by stamping, and can also reduce the space occupied by the false tab groove 420, thereby reducing the overall volume of the battery and being beneficial to improving the energy density of the battery.

[0049] Specifically, the first abutting surface 311 and the second abutting surface 321 can be planar structures. The first abutting surface 311 and the second abutting surface 321 are arranged in parallel, and both the first abutting surface 311 and the second abutting surface 321 are perpendicular to the first direction. The first abutting surface 311 and the second abutting surface 321 are used to contact the aluminum-plastic film 400. There is a height difference a between the first abutting surface 311 and the second abutting surface 321, so that the core body groove 410 and the false tab groove 420 formed by the aluminum-plastic film 400 after punching the shell have a depth difference b, and the height difference a is equal to the depth difference b. Compared with the first abutting surface 311 and the second abutting surface 321 being in the same plane, it reduces the space occupied by the false tab groove 420, is beneficial to improving the utilization rate of space, and improves the energy density of the battery.

[0050] It should be noted that the thickness of the battery cell body is greater than that of the dummy tab structure, and the depth of the battery cell body groove 410 is greater than that of the dummy tab groove 420. This can adaptively accommodate the battery cell body and the dummy tab structure, avoid wasting the space of the dummy tab groove 420, make the packaged battery cell more compact, and is beneficial to improving the energy density of the battery. In addition, the space occupied by a single packaged battery is reduced, so that more batteries can be accommodated in a certain space, which is beneficial to improving the energy density of the battery pack.

[0051] Referring to Figure 7 and Figure 8 , in some embodiments, along the second direction, a plurality of protrusions 320 are connected to one side of the punch body 310, and the plurality of protrusions 320 are arranged at intervals along the third direction. The third direction is perpendicular to the first direction and perpendicular to the second direction. By abutting the aluminum-plastic film 400 with the plurality of protrusions 320, dummy tab grooves 420 are formed at the abutting positions of the aluminum-plastic film 400 corresponding to the respective protrusions 320. That is, after punching the shell, the aluminum-plastic film 400 has a plurality of dummy tab grooves 420, and each dummy tab groove 420 is located at a different position for accommodating the dummy tab structures at different positions.

[0052] For example, the battery cell may include combinations such as two dummy negative tabs, one dummy positive tab and one dummy negative tab, etc. Each dummy tab is located at a different position. The number and position of the protrusions 320 can be set according to the position and number of the dummy tabs to adaptively accommodate different combinations of dummy tab structures, which helps to improve the applicability of the punching die for the shell.

[0053] Referring to Figures 1 to 8 , specifically, along the first direction, the punch assembly 300 punches the aluminum-plastic film 400. Along the second direction, a plurality of protrusions 320 are connected to the same side of the punch body 310. Along the third direction, the plurality of protrusions 320 are arranged at intervals to prevent the plurality of protrusions 320 from overlapping along the second direction, and are used for punching to form spaced dummy tab grooves 420.

[0054] Referring to Figures 1 to 3, in some embodiments, the punch assembly 300 further includes an airbag punch 330. Along the third direction, the airbag punch 330 is located on one side of the punch body 310 and is used to punch an airbag groove 430 in the aluminum-plastic film 400. The airbag punch 330 is spaced apart from the punch body 310 to ensure a gap between the main cell body groove 410 and the airbag groove 430, thus ensuring the safety of the battery. The first template 100 is further provided with a third groove 120. Along the first direction, the airbag punch 330 projects into the third groove 120. The aluminum-plastic film 400 covers both the first groove 110 and the third groove 120 at the same time. The airbag punch 330 is used to punch a part of the aluminum-plastic film 400 into the third groove 120 to cause deformation, so as to form the airbag groove 430. The third direction is perpendicular to the first direction and perpendicular to the second direction. Thus, the shell punching die of the present application can punch the airbag groove 430 while punching the false tab groove 420, improving the safety and reliability of the battery.

[0055] Specifically, the shape of the third groove 120 matches the shape of the airbag punch 330. The side wall of the airbag punch 330 and the groove wall of the third groove 120 jointly punch the aluminum-plastic film 400 to deform it, forming the airbag groove 430.

[0056] Reference Figures 1 to 3 , in some embodiments, the number of the airbag punches 330 is plural. Along the second direction, the plural airbag punches 330 are spaced apart, so that the airbag grooves 430 formed by shell punching are spaced apart, ensuring that each airbag groove 430 is independent of each other, which is beneficial to blocking the chain reaction between the airbag grooves 430 and avoiding the simultaneous failure of multiple airbag grooves 430, thereby ensuring the safety of the main cell.

[0057] Specifically, the number of the airbag punches 330 can be two, three or other numbers. Correspondingly, the number of the third grooves 120 is equal to the number of the airbag punches 330, and the position of each airbag punch 330 corresponds to the position of each third groove 120. Taking the punch assembly 300 including two airbag punches 330 as an example, the number of the third grooves 120 is also two. One airbag punch 330 projects into one of the third grooves 120 along the first direction, and the other airbag punch 330 projects into the other third groove 120 along the first direction. The third groove 120 is used to provide a clearance space for the airbag punch 330 to punch the aluminum-plastic film 400, so as to ensure the formation of the airbag groove 430.

[0058] Reference Figure 1, in some embodiments, the shell punching die further includes a second template 200. Along the first direction, the second template 200 is further provided with a fourth groove 220. Part of the airbag punch 330 is located in the fourth groove 220. The part of the airbag punch 330 located in the fourth groove 220 matches the shape of the fourth groove 220. The setting of the fourth groove 220 facilitates the positioning and installation of the airbag punch 330 and restricts the airbag punch 330 from shaking relative to the second template 200 during the shell punching operation, which is beneficial to ensuring the shell punching accuracy of the aluminum-plastic film 400.

[0059] For example, the fourth groove 220 can be in the shape of a square, a triangle, etc. Correspondingly, the shape of the part of the airbag punch 330 located in the fourth groove 220 is a square, a triangle, etc., realizing the shape matching between the airbag punch 330 and the fourth groove 220, avoiding the shaking of the airbag punch 330 relative to the second template 200 during shell punching, and being beneficial to ensuring the shell punching accuracy.

[0060] Reference Figures 1 to 3 , in some embodiments, the shell punching die further includes a second template 200. Along the first direction, the punch assembly 300 is movably connected to the second template 200, and at least a part of the punch assembly 300 protrudes from the outer surface of the second template 200 facing the first template 100, so as to ensure that when the first template 100 abuts against the second template 200, the punch assembly 300 punches the aluminum-plastic film 400. The punch assembly 300 moves relative to the second template 200 along the first direction to adjust the height of the punch assembly 300 protruding from the outer surface of the second template 200, and further, during the shell punching operation, change the depths of the false tab groove 420 and the cell body groove 410 formed by the shell punching die punching the aluminum-plastic film 400, so as to facilitate adjusting the punching depth according to the sizes of the cell body and the false tab.

[0061] Specifically, the second template 200 may include a second groove 210. The punch body 310 is connected to the protruding part 320. A part of the punch body 310 and the protruding part 320 is located in the second groove 210, and along the first direction, a part of the punch body 310 and the protruding part 320 protrude from the outer surface of the second template 200 facing the first template 100. When the first template 100 abuts against the second template 200, the parts of the punch body 310 and the protruding part 320 protruding from the second template 200 punch the aluminum-plastic film 400. The cell body groove 410 is formed at the position where the punch body 310 abuts against the aluminum-plastic film 400, and the false tab groove 420 is formed at the position where the protruding part 320 abuts against the aluminum-plastic film 400. The punch body 310 and the protruding part 320 can move relative to the second substrate along the first direction to adjust the height of the punch body 310 and the protruding part 320 protruding from the outer surface of the second template 200 facing the first template 100, and further adjust the depths of the cell body groove 410 and the false tab groove 420.

[0062] ReferenceFigures 1 to 3 In some embodiments, the punch assembly 300 further includes a connecting member 340 and an airbag punch 330. Both the punch body 310 and the airbag punch 330 are connected to the connecting member 340, and the punch body 310 and the airbag punch 330 are movably connected to the second template 200. The punch body 310 is connected to the protrusion 320. By relatively adjusting the heights of the punch body 310 and the airbag punch 330 exposed outside the second template 200 respectively, and connecting the punch body 310 and the airbag punch 330 through the connecting member 340, the punch body 310, the protrusion 320 and the airbag punch 330 can be moved synchronously relative to the second template 200, and at the same time, the outer convex heights of the punch body 310, the protrusion 320 and the airbag punch 330 relative to the second template 200 can be adjusted, so that the depths of the false tab groove 420, the cell body groove 410 and the airbag groove 430 formed by punching the aluminum-plastic film 400 can be adjusted simultaneously, and the adjustment is more convenient and rapid.

[0063] The following further describes the shell punching die of the present application in combination with the specific shell punching process of the shell punching die:

[0064] Refer to Figures 1 to 3 Before the shell punching operation, the first template 100 and the second template 200 are arranged at intervals in the first direction. The first template 100 is provided with a first groove 110 and a third groove 120. The aluminum-plastic film 400 is placed on the first template 100, and the aluminum-plastic film 400 covers the first groove 110 and the third groove 120. The second template 200 is connected with a punch assembly 300. A part of the punch assembly 300 protrudes outside the second template 200 toward the side of the first template 100. The first template 100 and the second template 200 approach each other in the first direction. The part of the punch assembly 300 that protrudes outside the second template 200 toward the first template 100 is used to abut against the aluminum-plastic film 400. The aluminum-plastic film 400 deforms under the abutment of the punch assembly 300. The position where the punch assembly 300 abuts against the aluminum-plastic film 400 corresponds to the first groove 110 and the third groove 120. The punch assembly 300 punches and deforms the aluminum-plastic film 400. A part of the aluminum-plastic film 400 is located in the first groove 110 and the third groove 120. The punch assembly 300 cooperates with the groove wall of the first groove 110 to punch and form a cell body groove 410 and a false tab groove 420 on the aluminum-plastic film 400, and, cooperates with the groove wall of the third groove 120 to punch and form an airbag groove 430 on the aluminum-plastic film 400 until the first template 100 abuts against the second template 200.

[0065] After the first template 100 abuts against the second template 200, it is maintained for a preset time, and then the first template 100 and the second template 200 are separated again. The punch assembly 300 moves with the second template 200 to disengage from the abutment with the aluminum-plastic film 400, and the punched aluminum-plastic film 400 is taken off.

[0066] Refer to Figures 1 to 3, The shell punching device according to the embodiment of the present application includes a driving device and the shell punching die in any of the above embodiments. The shell punching die is connected to the driving device. The driving device at least includes a first template 100 and a punch assembly 300. The driving device is configured to drive the first template 100 and the punch assembly 300 to approach or separate from each other. When the first template 100 and the punch assembly 300 are separated, the aluminum-plastic film 400 is placed on the first template 100, and the aluminum-plastic film 400 covers the first groove 110. When the first template 100 and the punch assembly 300 approach each other, the punch assembly 300 punches the aluminum-plastic film 400 to punch a part of the aluminum-plastic film 400 into the first groove 110. The aluminum-plastic film 400 deforms under the punching action of the punch body 310 to form a battery cell main body groove 410 and a false tab groove 420. The battery cell main body groove 410 is communicated with the false tab groove 420. The battery cell main body groove 410 is used to accommodate the battery cell main body, and the false tab groove 420 is used to accommodate the false tab structure. It is beneficial to accommodate the false tab structure and ensure the battery performance after battery packaging.

[0067] It should be noted that, compared with the shell punching device that punches the aluminum-plastic film 400 to form only the battery cell main body groove 410, the aluminum-plastic film 400 formed by the shell punching device in the present application can effectively avoid packaging defects such as poor packaging sealing and uneven packaging thickness, which is beneficial to improving the energy density of the battery and improving the lithium deposition phenomenon at the corners of the battery.

[0068] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present application within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A shell punching die, characterized in that, Comprising: A first template having a first groove along a first direction, the first groove including a first avoidance area and a second avoidance area; A punch assembly, along the first direction, the punch assembly is located on one side of the first template where the first groove is provided, the punch assembly includes a punch body and a protruding portion, along a second direction, the protruding portion is connected to one side of the punch body, and the second direction is perpendicular to the first direction; Wherein, along the first direction, the punch body projects into the first avoidance area, and the protruding portion projects into the second avoidance area, the punch body is configured to punch at least part of the encapsulation material into the first avoidance area to form a battery cell body groove, and the protruding portion is configured to punch at least part of the encapsulation material into the second avoidance area to form a false tab groove.

2. The shell punching die according to claim 1, characterized in that, The shell punching die further includes a second template having a second groove, part of the punch body and the protruding portion are located in the second groove, and the punch body and the protruding portion located in the second groove are arranged to match the shape of the second groove, along the first direction, the first template is located on one side of the punch assembly exposed from the second groove.

3. The shell punching die according to claim 1, characterized in that, Along the first direction, a first abutting surface is provided on one side of the punch body facing the first template, a second abutting surface is provided on one side of the protruding portion facing the first template, and there is a height difference between the first abutting surface and the second abutting surface; Wherein, the punch assembly is configured to approach the first template along the first direction so that the first abutting surface and the second abutting surface sequentially abut against the encapsulation material.

4. The shell punching die according to claim 1, wherein Along the second direction, a plurality of the protruding portions are connected to one side of the punch body, and the plurality of protruding portions are spaced along a third direction, the third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction.

5. The shell punching die according to claim 1, wherein, The punch assembly further includes an air bag punch, along the third direction, the air bag punch is located on one side of the punch body, the first template further has a third groove, along the first direction, the air bag punch projects into the third groove, the third direction is perpendicular to the first direction, and the third direction is perpendicular to the second direction.

6. The shell punching die according to claim 5, characterized in that, There are a plurality of the air bag punches, and the plurality of air bag punches are spaced along the second direction.

7. The shell punching die according to claim 5, characterized in that, The shell punching die further includes a second template, along the first direction, the second template further has a fourth groove, part of the air bag punches are located in the fourth groove, and the part of the air bag punch located in the fourth groove matches the shape of the fourth groove.

8. The shell punching die according to claim 1, characterized in that, The shell punching die further includes a second template, along the first direction, the punch assembly is movably connected to the second template, and at least a part of the punch assembly protrudes from the second template towards the first template side.

9. The shell punching die according to claim 8, wherein, The punch assembly further includes a connecting member and an air bag punch, the punch body and the air bag punch are both connected to the connecting member, and the punch body and the air bag punch are movably connected to the second template.

10. A shell punching device, characterized in that, Comprising: A driving device; The shell punching die according to any one of claims 1 to 9, wherein the shell punching die is connected to the driving device, and the driving device is used to drive the first template and the punch assembly to approach or move away from each other.

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