Male die, stamping die and stamping method

Abstract

The invention relates to a male die, a stamping die and a stamping method. The male die comprises a stamping die body and a flaring die body. The flaring die comprises a first external expansion piece and a second external expansion piece, the first external expansion piece and the second external expansion piece are arranged on the two opposite sides of the stamping die in the first direction correspondingly, and the first external expansion piece and the second external expansion piece can get close to each other or get away from each other in the first direction of the stamping die under the action of external force. When the aluminum plastic film is stamped, the aluminum plastic film is expanded in the first direction of the stamping die. According to the male die, the stamping die and the stamping method, the energy density of the battery and the reliability of the roll core can be well considered.

Description

Technical Field

[0001] The present application belongs to the field of battery technology and relates to a punch, a stamping die and a stamping method. Background Art

[0002] How to maximize space utilization within a limited battery size to achieve higher capacity is a common pursuit among battery manufacturers. Generally, the width of the separator is equal to the length of the core. Because the separator is flexible, its bending is generally considered to have no significant impact on battery reliability. Therefore, the core length is generally equal to the length of the die.

[0003] In the stamping die, a punch and a die are used to punch a hole in the aluminum-plastic film. The punched hole is a cavity for accommodating the core. Because the length of the die is greater than the length of the punch, and the side walls of the punch and the side walls of the die are spaced apart, when the aluminum-plastic film is punched and formed, the cross-section of the punched cavity gradually decreases from its opening to the bottom, causing the side walls of the cavity to tilt. The core is restricted by the tilted side walls of the cavity when it enters the shell. If the core length is too long, the negative electrode sheet may be squeezed and bent by the side walls of the cavity when entering the shell, thereby affecting the reliability of the core. If the core length is designed to be too small, although the risk of squeezing the negative electrode sheet when entering the shell is reduced, it also reduces the energy density of the battery.

[0004] Batteries produced by existing technologies are difficult to meet both high energy density and battery reliability. Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a punch, a stamping die and a stamping method to solve the problem that batteries produced by the prior art are difficult to meet both high energy density and battery reliability.

[0006] In order to solve the above technical problems, on the one hand, the present application provides a punch, including a stamping die and a flaring die; the flaring die includes a first outward expansion part and a second outward expansion part, and the first outward expansion part and the second outward expansion part are respectively arranged on opposite sides of the first direction of the stamping die, and the first outward expansion part and the second outward expansion part can approach or move away from each other along the first direction of the stamping die under the action of external force, so as to expand the aluminum-plastic film along the first direction of the stamping die when stamping the aluminum-plastic film.

[0007] Optionally, the first outward expansion member includes a first outward expansion body, a first bent edge, and a second bent edge, the first outward expansion body is connected between the first bent edge and the second bent edge, and the first bent edge and the second bent edge are located on opposite sides of the stamping die in the second direction; The first direction and the second direction intersect.

[0008] Optionally, the second outward expansion part includes a second outward expansion body, a third bending edge and a fourth bending edge; the second outward expansion body is connected between the third bending edge and the fourth bending edge, and the third bending edge and the fourth bending edge are located on opposite sides of the second direction of the stamping die.

[0009] Optionally, the first bending edge and the third bending edge are located on the same side of the second direction of the stamping die, the first bending edge and the third bending edge are spaced apart in the first direction of the stamping die, the second bending edge and the fourth bending edge are spaced apart in the first direction of the stamping die, and the second bending edge and the fourth bending edge are located on the same side of the second direction of the stamping die.

[0010] Optionally, the first bent edge is in contact with a side wall of the stamping die on one side along the second direction, and the second bent edge is in contact with a side wall of the stamping die on the other side along the second direction; The third bending edge is in contact with the side wall of the stamping die along one side of the second direction, and the fourth bending edge is in contact with the side wall of the stamping die along the other side of the second direction; Optionally, the convex mold has a top surface on the side close to the aluminum-plastic film in the third direction, and the top surface is arc-shaped, and the curvature of the top surface is , =30~60°; The first direction and the third direction intersect.

[0011] Optionally, a side of the first outwardly enlarged body close to the top surface smoothly transitions to the top surface, so that the first outwardly enlarged body forms a first top edge R angle on the side close to the top surface, and the first top edge R angle is 0.5-0.8 mm; The side of the second outwardly enlarged body close to the top surface is smoothly transitioned to the top surface, so that the second outwardly enlarged body forms a second top edge R angle on the side close to the top surface, and the second top edge R angle is 0.5-0.8 mm; The sidewall of the first outward expansion member in the second direction and the sidewall of the first outward expansion member in the first direction are smoothly transitioned, so that the intersection of the sidewall of the first outward expansion member in the second direction and the sidewall of the first outward expansion member in the first direction respectively forms a first vertical side R angle, and the first vertical side R angle is 1.15-1.65 mm; The sidewall of the second outward expansion component in the second direction and the sidewall of the second outward expansion component in the first direction are smoothly transitioned so that a second vertical side R angle is formed at the intersection of the sidewall of the second outward expansion component in the second direction and the sidewall of the second outward expansion component in the first direction, and the second vertical side R angle is 1.15~1.65mm.

[0012] On the other hand, an embodiment of the present application further provides a stamping die, comprising a die and the above-mentioned punch, wherein the die is provided with a receiving groove, and the punch can extend into the receiving groove to stamp the aluminum-plastic film.

[0013] Optionally, a distance between an outer surface of the first outer expansion member along the first direction of the stamping die and an inner wall of the concave die is 0.3-0.35 mm; The interval between the outer surface of the second outer expansion piece along the first direction of the stamping die and the inner wall of the concave die is 0.3-0.35 mm.

[0014] Optionally, the die includes an upper punch and a lower die, the upper punch and the lower die are sandwiched with an aluminum-plastic film, the upper punch is provided with a punch hole, the lower die is provided with a slot, the slot is opposite to the punch hole, and the punch hole and the slot constitute the accommodating groove.

[0015] In another aspect, a stamping method, applied to the above-mentioned stamping die, comprises: Placing the cut aluminum-plastic film on the concave mold and fixing it; Controlling the male die to move toward the female die and enter the receiving groove to punch the aluminum-plastic film; The male mold is controlled to move a predetermined distance toward the outside of the receiving groove and then stop, and the first and second external expansion parts are moved away from each other along a first direction of the male mold under the action of an external force, and the aluminum-plastic film is expanded along the first direction until the aluminum-plastic film is in contact with the inner wall of the female mold; After the expansion is completed, the first outer expansion piece and the second outer expansion piece move closer to each other along the first direction of the punch until they are reset; Control the punch to completely withdraw from the receiving groove of the die.

[0016] Optional, The predetermined distance is D, ; The convex mold has a top surface on a side close to the aluminum-plastic film in the third direction, and θ is the radian of the top surface; L is the length of the chord corresponding to the radian θ.

[0017] In the embodiments of the present application, the punch, stamping die, and stamping method are configured such that after the punch fully enters the die and stamps the aluminum-plastic film, the punch is withdrawn a predetermined distance, and the first and second outer expansion members move away from each other in a first direction, expanding the width of the aluminum-plastic film. After expansion, the first and second outer expansion members move toward each other in the first direction, return to their original position, and finally engage the stamping die, whereupon they are fully ejected from the die. These punch, stamping die, and stamping method can improve the energy density of batteries and reduce interference between the winding core and the aluminum-plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a male mold provided in one embodiment of the present application; Figure 2 This is a schematic diagram of the exploded structure of a punch provided in one embodiment of the present application; Figure 3 This is a schematic diagram of a structure in which a male mold fully enters a female mold according to an embodiment of the present application; Figure 4 This is a schematic diagram of a structure in which a male die is retreated a predetermined distance from a female die according to an embodiment of the present application; Figure 5 It is a structural schematic diagram of a concave mold provided in one embodiment of the present application.

[0019] The reference numerals in the specification are as follows: 100, first direction; 200, second direction; 300, third direction; 1. Concave die; 11. Upper punch die; 12. Lower concave die; 13. Punching hole; 14. Notching groove; 2. Punch die; 21. Stamping die; 22. First outward expansion member; 221. First outward expansion body; 222. First bending edge; 223. Second bending edge; 23. Second outward expansion member; 231. Second outward expansion body; 232. Third bending edge; 233. Fourth bending edge; 24. Top surface; 25. First top edge R angle; 26. First side edge R angle; 27. First vertical edge R angle; 28. First spherical surface R angle; 9. Aluminum-plastic film. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0021] See also Figures 1 to 4The present application provides a punch, including a stamping die 21 and an expanding die; the expanding die includes a first outward expansion piece 22 and a second outward expansion piece 23, which are respectively arranged on opposite sides of the first direction 100 of the stamping die 21. Under the action of external force, the first outward expansion piece 22 and the second outward expansion piece 23 can approach or move away from each other along the first direction 100 of the stamping die 21, so as to expand the aluminum-plastic film 9 along the first direction 100 of the stamping die 21 when stamping the aluminum-plastic film 9.

[0022] The first direction 100 of the punching die 21 in this embodiment is the length direction of the punching die 21 , and the first direction 100 of the punching die 21 is also the length direction of the punch 2 .

[0023] In combination with the background technology, the existing punch 2 is usually in the shape of a rectangular parallelepiped, and an R angle is set at the top of the existing punch 2 (the end extending into the die 1). The aluminum-plastic film 9 is punched through the existing die 1 and the existing punch 2. During stamping, there is a gap between the side wall of the existing die 1 and the side wall of the existing punch 2. The gap causes the side wall of the pit punched out by the aluminum-plastic film 9 to tilt. These tilted pit side walls affect the shelling of the core or the energy density of the battery.

[0024] After the punching die 21 of this embodiment enters the deepest distance of the groove, the punching action is completed. Thereafter, the punch 2 retreats a preset distance from its deepest distance in the groove, so that the aluminum-plastic film 9 and the top end of the punch 2 (the end extending into the die 1) are spaced apart. At this time, the bottom of the pit of the aluminum-plastic film 9 does not contact the top end of the punch 2 and this portion is called the deformation margin. At this time, under the action of an external force, the external force drives the first outer expansion member 22 and the second outer expansion member 23 to move away from each other along the first direction 100 of the punch 2. The first outer expansion member 22 and the second outer expansion member 23 respectively drive the side walls of the opposite sides of the aluminum-plastic film 9 to expand, thereby expanding the length of the pit of the aluminum-plastic film 9. Since the length of the pit punched on the aluminum-plastic film 9 is the width of the core, the first outer expansion member 22 and the second outer expansion member 23 further expand the width of the core that can be accommodated in the aluminum-plastic film 9. Therefore, this embodiment achieves the advantages of being able to accommodate a wider core and improving the energy density of the battery without changing the length of the existing die 1 and reducing the bending of the core by the aluminum-plastic film 9.

[0025] As an example, the first outward expansion member 22 includes a first outward expansion body 221, a first bent edge 222, and a second bent edge 223. The first outward expansion body 221 is connected between the first bent edge 222 and the second bent edge 223. The first bent edge 222 and the second bent edge 223 are located on opposite sides of the second direction 200 of the stamping die 21. The first direction 100 and the second direction 200 intersect. The second direction 200 is the width direction of the punch 2, and the second direction 200 is also the width direction of the stamping die 21. The first direction 100 and the second direction 200 are perpendicular. The general shape of the stamping die 21 in this embodiment can be regarded as a rectangular parallelepiped. The first outward expansion body 221 is plate-shaped, and the second bent edge 223 and the second bent edge 223 are respectively integrally formed with the first outward expansion body 221. The second outward expansion member 23 includes a second outward expansion body 231, a third bending edge 232 and a fourth bending edge 233; the second outward expansion body 231 is connected between the third bending edge 232 and the fourth bending edge 233, and the third bending edge 232 and the fourth bending edge 233 are located on opposite sides of the second direction 200 of the stamping die 21.

[0026] More specifically, the first bent edge 222 and the third bent edge 232 are located on the same side of the second direction 200 of the stamping die 21, and the first bent edge 222 and the third bent edge 232 are spaced apart in the first direction 100 of the stamping die 21. If the length of the first bent edge 222 and the third bent edge 232 along the first direction 100 is too long, it is easy to cause the first outward expansion body 221 and the second outward expansion body 231 to interfere with each other when the first outward expansion body 221 and the second outward expansion body 231 are close to each other. The second bent edge 223 and the fourth bent edge 233 are spaced apart in the first direction 100 of the stamping die 21, and the second bent edge 223 and the fourth bent edge 233 are located on the same side of the second direction 200 of the stamping die 21.

[0027] The first bent edge 222 fits the side wall of the stamping die 21 along one side of the second direction 200, and the second bent edge 223 fits the side wall of the stamping die 21 along the other side of the second direction 200; the third bent edge 232 fits the side wall of the stamping die 21 along one side of the second direction 200, and the fourth bent edge 233 fits the side wall of the stamping die 21 along the other side of the second direction 200.

[0028] When the first outwardly expanding body 221 moves away from the second outwardly expanding body 231, the first and second bent edges 222, 223 guide the first outwardly expanding body 221, ensuring that the first outwardly expanding body 221 always moves linearly along the first direction 100. Similarly, when the second outwardly expanding body 231 moves, the third and fourth bent edges 232, 233 also guide it, which will not be described in detail here.

[0029] As an example, the punch 2 has a top surface 24 on the side near the aluminum-plastic film 9 along the third direction 300. The top surface 24 is arc-shaped, and the curvature of the top surface 24 is θ, where θ=30-60°. The first direction 100 intersects the third direction 300. In this embodiment, the top surface 24 is provided on the side of the stamping die 21 along the third direction 300 near the aluminum-plastic film 9, and the top surface 24 is arc-shaped. During stamping, the bottom wall of the pit punched out on the aluminum-plastic film 9 is an arc-shaped pit. The arc-shaped bottom wall of the pit serves as a deformation allowance. When the first outer expansion member 22 and the second outer expansion member 23 respectively drive the side walls on the opposite sides of the aluminum-plastic film 9 to expand, the inclined side walls of the aluminum-plastic film 9 are driven to fit tightly against the side walls of the groove, and the inclined pit side walls are transformed into flat pit side walls. At the same time, the arc-shaped bottom wall of the pit is pulled into a flat shape, so that the length of the pit bottom wall along the first direction 100 increases, so that the pit punched out on the aluminum-plastic film 9 can accommodate a wider winding core.

[0030] Reference Figure 3 and Figure 4 As an example, the side of the first outer expansion member 22 close to the top surface 24 is smoothly transitioned to the top surface 24, so that the first outer expansion member 22 forms a first top edge R angle 25 on the side close to the top surface 24, and the first top edge R angle 25 is 0.5-0.8 mm; The side of the second outer expansion member 23 close to the top surface 24 is smoothly transitioned to the top surface 24, so that the second outer expansion member 23 forms a second top edge R angle on the side close to the top surface 24, and the second top edge R angle is 0.5-0.8 mm; The side walls of the first outward expansion member 22 in the second direction 200 and the side walls of the first outward expansion member 22 in the first direction 100 are smoothly transitioned, so that the intersection of the side walls of the first outward expansion member 22 in the second direction 200 and the side walls of the first outward expansion member 22 in the first direction 100 respectively forms a first vertical side R angle 27, and the first vertical side R angle 27 is 1.15~1.65mm; in this embodiment, there are two first vertical side R angles 27, one first vertical side R angle 27 is formed at the intersection of the first outward expansion body 221 and the first bent edge 222, and the other first vertical side R angle 27 is formed at the intersection of the first outward expansion body 221 and the second bent edge 223.

[0031] The side walls of the second outward expansion member 23 in the second direction 200 and the side walls of the second outward expansion member 23 in the first direction 100 are smoothly transitioned so that the intersection of the side walls of the second outward expansion member 23 in the second direction 200 and the side walls of the second outward expansion member 23 in the first direction 100 respectively forms a second vertical side R angle, and the second vertical side R angle is 1.15~1.65mm.

[0032] In this embodiment, there are two second vertical R angles. One second vertical R angle is formed at the junction of the second outwardly expanded body 231 and the third bent edge 232 , and another second vertical R angle is formed at the junction of the second outwardly expanded body 231 and the third bent edge 232 .

[0033] Along the second direction 200, the side wall of the stamping die 21 close to the top surface 24 protrudes outward to form a first side R angle 26, and the other side wall of the stamping die 21 close to the top surface 24 protrudes outward to form a second side R angle. The first side R angle 26 and the second side R angle are both 0.45-0.55 times the depth of the punch 2 entering the die 1, preferably 0.5 times, because the two sides of the battery cell are semicircular, the first side R angle and the second side R angle punched out on the aluminum-plastic film must be able to cover the two sides of the battery cell, and the first side R angle and the second side R angle formed by the shell are about half the thickness of the battery cell. Therefore, the first side R angle 26 and the second side R angle are both controlled to be 0.45-0.55 times the depth of the punch 2 entering the die 1.

[0034] Figure 2 In the figure, the intersection of the first side R angle 26, the first top R angle 25 and the first vertical R angle 27 is smoothly transitioned to form a first spherical R angle 28. In this embodiment, there are two first spherical R angles 28, and the two first spherical R angles 28 are respectively located at the two corners on the side of the first expansion piece 22 close to the top surface 24. The intersection of the second side R angle, the second top R angle and the second vertical R angle is smoothly transitioned to form a second spherical R angle. In this embodiment, there are two second spherical R angles, and the two second spherical R angles are respectively located at the two corners on the side of the second expansion piece 23 close to the top surface 24. That is, the two first spherical R angles 28 are located on the same side of the first direction 100, and the two second spherical R angles are located on the other side of the first direction 100. In this embodiment, the size and structure of the first spherical R angle 28 are the same as the size and structure of the second spherical R angle, so Figure 2 One of the first spherical surface R angles 28 is described below: Because the three sides corresponding to the first spherical surface R angle have different chamfer sizes, to ensure a smoother chamfer at the SR angle, the chamfer distance must be designed based on the different chamfer sizes. The smaller the chamfer of the top, side, or vertical edge, the earlier the chamfer should be started to achieve a smooth transition to the first spherical R angle. The top edge, with an R angle of 0.5-0.7mm, is the smallest of the three sides and should be chamfered first. If the chamfer distance is too large, the first spherical R angle will shift toward the battery body, making it difficult to roll the core into the shell. The distance between the adjacent edges of the first top edge R corner 25 and the first side edge R corner 26 is L2, L2=6h / 8~7h / 8, the distance between the adjacent edges of the first top edge R corner 25 and the first vertical side R corner 27 is L1, L1=3h / 8~4h / 8; the distance between the adjacent edges of the first vertical side R corner 27 and the first side edge R corner 26 is L3, L3=1h / 4~3h / 8, where h is the stamping depth, that is, h is the deepest depth of the punch 2 entering the die 1.

[0035] Reference Figure 5 , Figure 5 The punch 2 formed by the stamping die 21, the first outer expansion piece 22, and the second outer expansion piece 23 is schematically illustrated with a gray box in the figure. One embodiment of the present application also provides a stamping die, comprising a die 1 and the aforementioned punch 2. The die 1 is provided with a receiving groove, into which the punch 2 can extend to stamp the aluminum-plastic film 9. The die 1 comprises an upper punch 11 and a lower die 12. The upper and lower dies 11 and 12 sandwich the aluminum-plastic film 9. The upper punch 11 is provided with a punch hole 13, and the lower die 12 is provided with a punch groove 14. The punch hole 14 is opposite the punch hole 13, and the punch hole 13 and the punch groove 14 form a receiving groove.

[0036] In this embodiment, the aluminum-plastic film 9 is positioned and fixed between the upper punch die 11 and the lower die 12. The upper punch die 11 and the lower die 12 clamp the aluminum-plastic film 9 therebetween. The punch 2 first enters the punching groove 14 and then enters the punching hole 13 to punch the aluminum-plastic film 9 between the upper punch die 11 and the lower die 12 to form a punching pit on the aluminum-plastic film 9.

[0037] As an example, the spacing between the outer surface of the first outer expansion member 22 along the first direction 100 of the stamping die 21 and the inner wall of the die 1 is d, d = 0.3-0.35 mm; the spacing between the outer surface of the second outer expansion member 23 along the first direction 100 of the stamping die 21 and the inner wall of the die 1 is 0.3-0.35 mm. In the first direction 100, the spacing between the outer surface of the first outer expansion member 22 and the outer surface of the second outer expansion member 23 and the side wall of the groove in this embodiment is generally controlled to be 0.3-0.35 mm. In the second direction 200, it is only necessary to ensure that the spacing between the outer surface of the punch 2 and the inner wall of the die 1 is 0.3-0.35 mm. Generally, in the second direction 200, the spacing between the outer surface of the first bent edge 222, the outer surface of the second bent edge 223, the outer surface of the third bent edge 232, and the outer surface of the fourth bent edge 233 and the side wall of the groove is 0.3-0.35 mm.

[0038] Reference Figure 3 and Figure 4 In one embodiment, the die 1 is in the shape of a block, not Figure 5 In the split design, the receiving groove is set on the die 1, and the punch 2 directly enters the die 1. Figure 3 In the process, the punch 2 enters the receiving groove and punches the aluminum-plastic film 9. Figure 4 In the embodiment, after the aluminum-plastic film 9 is punched, the punch 2 as a whole retreats 1-1.5 mm relative to the die 1 , and the first and second outer expansion pieces 22 and 23 are expanded in the length direction of the punching die 21 .

[0039] An embodiment of the present application further provides a stamping method, which is applied to the above-mentioned stamping die, comprising: Place the cut aluminum-plastic film 9 on the die 1 and fix it; Control the punch 2 to move toward the die 1 and enter the receiving groove to punch the aluminum-plastic film 9; The male mold 2 is controlled to move toward the outside of the receiving groove for a predetermined distance and then stop. Under the action of an external force, the first external expansion member 22 and the second external expansion member 23 move away from each other along the first direction 100 of the male mold 2, and the aluminum-plastic film 9 is expanded along the first direction 100 until the aluminum-plastic film 9 fits the inner wall of the female mold 1. After the expansion is completed, the first outer expansion piece 22 and the second outer expansion piece 23 move closer to each other along the first direction 100 of the punch 2 until they are reset; Control the punch 2 to completely withdraw from the receiving groove of the die 1.

[0040] Reference Figure 3 and Figure 4In this embodiment, the aluminum-plastic film 9 is first cut to the appropriate size based on the dimensions of the stamping die. The film 9 is then placed and secured between the upper punch die 11 and the lower concave die 12. The stamping die is then placed under the platen of a pneumatic press operating at a pressure of 800-1500 kg. The press is then activated, and the punch 2 enters the concave die 1, forming the desired dent in the aluminum-plastic film 9. The punch 2 then retreats 1-1.5 mm relative to the concave die 1, allowing the first and second outer expansion members 22 and 23 to expand along the length of the stamping die 21. The air pressure applied by the first and second outer expansion members 22 and 23 is controlled at 0.3-0.6 MPa.

[0041] After expansion, the first outer expansion piece and the second outer expansion piece approach each other until they fit into the stamping die, and the punch is completely withdrawn from the die. After withdrawal, the processed aluminum-plastic film 9 can be taken out.

[0042] Specifically, The predetermined distance is D, ; The male mold 2 has a top surface 24 on the side close to the aluminum-plastic film 9 in the third direction 300, and θ is the radian of the top surface 24; L is the length of the chord corresponding to the radian θ.

[0043] The aluminum-plastic film 9 processed by the method in this application can achieve the following effects: Take the specific parameters of the battery as an example: the top seal width is 2.3mm and the design average length of the battery cell is 44.7mm.

[0044] For this type of battery, a single pit is punched out using a 0.113mm aluminum-plastic film 9 with a depth of 5.6mm. To ensure the reliability of such a large stretching of the single pit in the aluminum-plastic film 9, the top edge R angle, vertical edge R angle and side edge R angle of the punch 2 are all 0.8mm in the length direction of the die 1 (the length direction of the punch 2), and the gap between one side wall of the die 1 and the side wall of the punch 2 opposite to it is 0.35mm.

[0045] The battery produced by the method of the present application is compared with the existing battery. The comparison results are shown in the following table (Table 1): Table 1 It can be seen from the above table that the battery manufactured by the stamping method of the present application has improved the energy density of the battery compared with the existing battery.

[0046] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A punch, characterized in that: The invention comprises a stamping die (21) and an expanding die; the expanding die comprises a first expanding part (22) and a second expanding part (23); the first expanding part (22) and the second expanding part (23) are respectively arranged on opposite sides of a first direction (100) of the stamping die (21); the first expanding part (22) and the second expanding part (23) can move closer to or farther away from each other along the first direction (100) of the stamping die (21) under the action of an external force, so as to expand the aluminum-plastic film (9) along the first direction (100) of the stamping die (21) when stamping the aluminum-plastic film (9).

2. The punch according to claim 1, wherein: The first outward expansion member (22) comprises a first outward expansion body (221), a first bending edge (222) and a second bending edge (223); the first outward expansion body (221) is connected between the first bending edge (222) and the second bending edge (223); the first bending edge (222) and the second bending edge (223) are located on opposite sides of the second direction (200) of the stamping die (21); The first direction (100) and the second direction (200) intersect.

3. The punch according to claim 2, characterized in that The second outward expansion member (23) comprises a second outward expansion body (231), a third bent edge (232) and a fourth bent edge (233); the second outward expansion body (231) is connected between the third bent edge (232) and the fourth bent edge (233), and the third bent edge (232) and the fourth bent edge (233) are located on opposite sides of the second direction (200) of the stamping die (21).

4. The punch according to claim 3, characterized in that The first bending edge (222) and the third bending edge (232) are located on the same side of the second direction (200) of the stamping die (21), the first bending edge (222) and the third bending edge (232) are spaced apart in the first direction (100) of the stamping die (21), the second bending edge (223) and the fourth bending edge (233) are spaced apart in the first direction (100) of the stamping die (21), and the second bending edge (223) and the fourth bending edge (233) are located on the same side of the second direction (200) of the stamping die (21).

5. The punch according to claim 3, characterized in that The first bending edge (222) is in contact with the side wall of the stamping die (21) on one side along the second direction (200), and the second bending edge (223) is in contact with the side wall of the stamping die (21) on the other side along the second direction (200); The third bending edge (232) is in contact with the side wall of the stamping die (21) on one side along the second direction (200), and the fourth bending edge (233) is in contact with the side wall of the stamping die (21) on the other side along the second direction (200).

6. The punch according to claim 3, characterized in that The male mold (2) has a top surface (24) on one side close to the aluminum-plastic film (9) in the third direction (300), and the top surface (24) is arc-shaped, and the curvature of the top surface (24) is θ, θ=30-60°; The first direction (100) and the third direction (300) intersect.

7. The punch according to claim 6, characterized in that The side of the first outwardly expanding body (221) close to the top surface (24) smoothly transitions to the top surface (24), so that the first outwardly expanding body (221) forms a first top edge R angle on the side close to the top surface (24), and the first top edge R angle is 0.5-0.8 mm; The side of the second outwardly expanded body (231) close to the top surface (24) smoothly transitions to the top surface (24), so that the second outwardly expanded body (231) forms a second top edge R angle on the side close to the top surface (24), and the second top edge R angle is 0.5-0.8 mm; The side wall of the first outer expansion member (22) in the second direction (200) and the side wall of the first outer expansion member (22) in the first direction (100) are smoothly transitioned, so that the intersection of the side wall of the first outer expansion member (22) in the second direction (200) and the side wall of the first outer expansion member (22) in the first direction (100) respectively forms a first vertical side R angle, and the first vertical side R angle is 1.15~1.65mm; The side wall of the second outer expansion piece (23) in the second direction (200) and the side wall of the second outer expansion piece (23) in the first direction (100) are smoothly transitioned, so that the intersection of the side wall of the second outer expansion piece (23) in the second direction (200) and the side wall of the second outer expansion piece (23) in the first direction (100) respectively forms a second vertical side R angle, and the second vertical side R angle is 1.15~1.65mm.

8. A stamping die, characterized in that: It comprises a die (1) and a punch (2) according to any one of claims 1 to 7, wherein the die (1) is provided with a receiving groove, and the punch (2) can extend into the receiving groove to punch the aluminum-plastic film (9).

9. The stamping die according to claim 8, characterized in that: The spacing between the outer surface of the first outer expansion piece (22) along the first direction (100) of the punching die (21) and the inner wall of the concave die (1) is 0.3-0.35 mm; The spacing between the outer surface of the second outer expansion piece (23) along the first direction (100) of the punching die (21) and the inner wall of the concave die (1) is 0.3-0.35 mm.

10. The stamping die according to claim 8, characterized in that: The die (1) comprises an upper punch (11) and a lower die (12); an aluminum-plastic film (9) is sandwiched between the upper punch (11) and the lower die (12); a punch hole (13) is provided on the upper punch (11); a punch groove (14) is provided on the lower die (12); the punch groove (14) is opposite to the punch hole (13); and the punch hole (13) and the punch groove (14) constitute the accommodating groove.

11. A stamping method, characterized in that: The stamping die according to claim 8 comprises: The cut aluminum-plastic film (9) is placed on the concave mold (1) and fixed; Controlling the male die (2) to move toward the female die (1) and enter the receiving groove to punch the aluminum-plastic film (9); The male mold (2) is controlled to move a predetermined distance toward the outside of the receiving groove and then stop, and the first external expansion piece (22) and the second external expansion piece (23) are moved away from each other along a first direction (100) of the male mold (2) under the action of an external force, and the aluminum-plastic film (9) is expanded along the first direction (100) until the aluminum-plastic film (9) is attached to the inner wall of the female mold (1); After the expansion is completed, the first outer expansion piece (22) and the second outer expansion piece (23) approach each other along the first direction (100) of the male mold (2) until they are reset; The male die (2) is controlled to completely withdraw from the accommodating groove of the female die (1).

12. The stamping method according to claim 11, characterized in that: The predetermined distance is D, ; The male mold (2) has a top surface (24) on a side close to the aluminum-plastic film (9) in the third direction, and θ is the radian of the top surface (24); L is the length of the chord corresponding to radian θ.

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