An arc-shaped battery film shell spinning type mold

Abstract

This utility model discloses a rotary stamping mold for arc-shaped battery film housings, comprising a concave mold, a convex mold, and an arc-shaped recess stamping assembly. The concave mold has a recessed cavity, and the convex mold has a convex core with a mounting hole. The arc-shaped recess stamping assembly includes a die base, two punches, and a punch drive mechanism. The die base is mounted in the mounting hole, and the two punches are coaxially hinged. Each punch has an arc-shaped stamping portion, and the two punches have an engaged state and an open state. In the engaged state, one end of the arc-shaped stamping portions of the two punches abuts against each other to form an arc-shaped protrusion. In the open state, the arc-shaped stamping portions of the two punches are separated by a predetermined distance, and the separated ends of the arc-shaped stamping portions have stepped stamping surfaces. The punch drive mechanism controls the switching between the engaged and open states of the two punches. The above-mentioned mold can produce arc-shaped battery film housings with relatively complete arc-shaped recesses, which is beneficial to improving the quality of subsequent assembly and packaging of the core.

Description

Technical Field

[0001] This utility model relates to battery production equipment, and in particular to an arc-shaped battery film shell rotary punching mold. Background Technology

[0002] Currently, curved battery film housings are mainly manufactured using stamping dies. These dies consist of a die and a punch. The die has a cavity, and the punch has a corresponding core. When the die and punch are closed, the aluminum-plastic film placed between them is stamped to form a curved housing. For the installation of the core, curved recesses need to be further stamped into the inner wall of the curved housing. The structure of the completed curved battery film housing is shown in [reference needed]. Figure 1 and Figure 2 As shown. In the prior art, an arc-shaped punch is integrally formed on the core of the punch, and the aforementioned arc-shaped recess can be formed by stamping with the arc-shaped punch. In the aforementioned mold, in order to facilitate the demolding of the battery film shell, both ends of the arc-shaped punch are inclined surfaces, which causes the two ends of the arc-shaped recess to form slopes, affecting the integrity of the arc-shaped recess. When the core and the arc-shaped recess are matched, they cannot be completely sunk into the arc-shaped recess. The core is easy to slide and cannot be positioned, which makes the core prone to displacement during the subsequent packaging process. This makes the operation difficult, affects the work efficiency, and results in an uneven appearance and poor packaging effect after packaging, affecting product performance and failing to meet customer needs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an arc-shaped battery film shell rotary stamping mold, which can produce arc-shaped battery film shells with relatively complete arc-shaped recesses, which is beneficial to improving the quality of subsequent assembly and packaging of the core.

[0004] According to an embodiment of the present invention, an arc-shaped battery film shell rotary stamping die includes: a concave die with a recessed cavity, the cavity wall of which has a relief groove; a convex die with a convex core corresponding to the recessed cavity, the convex core having a mounting hole, the mounting hole being correspondingly opposite to the relief groove; and an arc-shaped recess stamping assembly including a die base, two punches, and a punch driving mechanism, the die base being mounted in the mounting hole, the two punches being coaxially hinged to the die base, and each punch having an arc-shaped stamping portion relative to the convex core. The core has a protruding die surface that corresponds to and is positioned opposite to the relief groove. The two punches have an engaged state and an open state: in the engaged state, one end of the arc-shaped stamping portion of the two punches abuts against each other to form an arc-shaped protrusion; in the open state, the arc-shaped stamping portions of the two punches are moved away from each other by a predetermined distance along the circumferential direction of the hinge axis of the two punches; a stepped stamping surface is provided at the end of the arc-shaped stamping portions that are moved away from each other; the punch driving mechanism is provided on the die holder and is used to control the two punches to switch between the engaged state and the open state.

[0005] According to an embodiment of the present invention, a rotary stamping die for an arc-shaped battery film shell has at least the following beneficial effects: When producing an arc-shaped battery film shell, the two stamping blocks are first kept in an engaged state, and the aluminum-plastic film is placed between the concave die and the convex die, so that the concave die and the convex die are closed, and the convex core and the concave cavity are closed to form the aluminum-plastic film into an arc-shaped battery film shell. The arc-shaped stamping parts of the two stamping blocks in the engaged state are combined to form an arc-shaped convex strip structure, and further stamping is performed on the inner wall of the arc-shaped battery film shell to form an arc-shaped recess. Then, the two stamping blocks are driven from the engaged state to the open state by the stamping block driving mechanism, so that the arc-shaped stamping parts of the two stamping blocks are moved away from each other, and the stepped stamping surface is used to stamp and extend and expand outward at both ends of the arc-shaped recess to form a stepped structure, thereby effectively ensuring the integrity of the arc-shaped recess. The two ends of the arc-shaped recess can have sufficient installation space for the core to be inserted, thereby facilitating the subsequent assembly and sealing of the core, which is beneficial to improving the quality of subsequent assembly and sealing of the core. After molding is completed, the two punches are reset to the mating state by the punch drive mechanism, so as not to affect demolding.

[0006] According to some embodiments of the present invention, the arc-shaped stamping part has an arc-shaped forming surface, the arc-shaped forming surface is a circular arc surface and the center of the circle coincides with the hinge axis of the two stamping blocks.

[0007] According to some embodiments of the present invention, the stepped stamping surface is the end face of the arc-shaped stamping part, the end face is a plane, and the extension surface of the end face passes through the hinge axis of the two stamping blocks.

[0008] According to some embodiments of the present invention, one end of the die holder is provided with an adapter die surface, the adapter die surface is flush with the die surface of the protruding core, the adapter die surface is provided with a punch block setting hole, two punch blocks are disposed in the punch block setting hole, the arc-shaped stamping portion of the two punch blocks protrudes out of the punch block setting hole and protrudes from the adapter die surface; the adapter die surface is a cylindrical surface, at least a portion of the arc-shaped stamping portion is an arc-shaped piece, the arc-shaped piece is adapted to the cylindrical surface and slides with each other, and the center of the cylindrical surface coincides with the hinge axis of the two punch blocks.

[0009] According to some embodiments of the present invention, the punch drive mechanism includes a drive member, a punch reset elastic structure, and a drive member reset elastic structure. The punch includes a pivot portion and a linkage portion. The linkage portion and the arc-shaped stamping portion are connected to both sides of the pivot portion. Two punches are cross-hinged through the pivot portion. The punch reset elastic structure is disposed on the die base and is used to make the two linkage portions tend to approach each other. The drive member is telescopically disposed on the die base. The drive member has a pressing portion. The pressing portion is positioned corresponding to the two linkage portions and can be inserted into and withdrawn from the position between the two linkage portions. When the pressing portion is inserted into the position between the two linkage portions, it can open the two linkage portions and cause the two punches to enter the opened state. When the pressing portion withdraws from the position between the two linkage portions, the two linkage portions approach each other through the punch reset elastic structure and cause the two punches to enter the engaged state. The drive member reset elastic structure is disposed on the die base and is used to make the drive member tend to withdraw from the position between the two linkage portions.

[0010] According to some embodiments of this utility model, the driving member is a push rod structure. The driving member extends along the mold opening and closing direction and slides on the die holder along the mold opening and closing direction. The driving member is located on the side of the two punches away from the die. The pressing part is located at one end of the driving member close to the two punches. The pushing part is located at one end of the driving member away from the two punches. When the pressing part is withdrawn from the position between the two linkage parts, the pushing part extends relative to the die holder and the punch in a direction away from the die.

[0011] According to some embodiments of the present invention, when the two linkage parts approach each other through the punch block reset elastic structure, they are mutually limited and an insertion gap is formed between them. The pressing part includes a front insertion section and a spreading section. The front insertion section is disposed at the end of the pushing part and is disposed corresponding to the insertion gap. The front insertion section is adapted to be inserted into the insertion gap. The spreading section is adjacent to the front insertion section. Guide surfaces for corresponding sliding cooperation with the two linkage parts are respectively provided on both sides of the spreading section. The guide surfaces are used to guide the two linkage parts away from each other.

[0012] According to some embodiments of the present invention, the guide surface includes a primary inclined surface and a secondary inclined surface. One end of the primary inclined surface is connected to the front insertion section, and one end of the secondary inclined surface is connected to the other end of the primary inclined surface. The angle between the primary inclined surface and the mold opening and closing direction is greater than the angle between the secondary inclined surface and the mold opening and closing direction.

[0013] According to some embodiments of the present invention, the punch block reset elastic structure includes two first springs corresponding to the two linkage parts, and the two ends of the first springs abut against the corresponding linkage part and the punch die base; the drive member reset elastic structure includes two second springs, and spring abutment parts corresponding to the two second springs extend from both sides of the drive member, and the two ends of the second springs abut against the corresponding spring abutment parts and the punch die base.

[0014] According to some embodiments of the present invention, the die is provided with stepped stamping mating surfaces that correspond one-to-one with the stepped stamping surfaces of the arc-shaped stamping part. When the die is closed and the two punches are in the open state, the stepped stamping surfaces and the stepped stamping mating surfaces correspond one-to-one.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 For producing curved battery film housings using existing molds; Figure 2 for Figure 1 A cross-sectional view of the structure shown; Figure 3 This is a perspective view of an embodiment of the present utility model; Figure 4 This is an exploded view of an embodiment of the present invention; Figure 5This is a three-dimensional schematic diagram of the concave mold according to an embodiment of the present utility model; Figure 6 This is an exploded view of the arc-shaped recess stamping assembly according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the punch block in the engagement state according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the punch block in the extended state according to an embodiment of the present invention; Figure 9 for Figure 8 Enlarged view of point B; Figure 10 The arc-shaped battery film shell produced through the embodiments of this utility model; Figure 11 for Figure 10 A cross-sectional view of the structure shown.

[0017] Figure label: Arc-shaped battery film shell 1, arc-shaped recess 2; Die 100, cavity 110, relief groove 120, stepped stamping mating surface 130; Punch 200, protruding core 210, mounting hole 220; Arc-shaped recess stamping assembly 300, die base 310, punch block 320, punch block drive mechanism 330, pin shaft 340, adapter die surface 311, punch block setting hole 312, arc-shaped stamping part 321, stepped stamping surface 322, arc-shaped forming surface 323, pivot part 324, linkage part 325, drive component 331, punch block reset elastic structure 332, drive component reset elastic structure 333, insertion gap 334, pressing part 3311, pushing part 3312, front insertion section 3311a, spreading section 3311b, first-level inclined surface 3311c, second-level inclined surface 3311d, first spring 3321, second spring 3331. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 2 The arc-shaped battery film shell 1 is produced by existing molds, wherein the arc-shaped recess 2 has sloping ends and no further extension for installation.

[0023] Reference Figures 3 to 9 A rotary stamping die for an arc-shaped battery film casing includes: a concave die 100, a convex die 200, and an arc-shaped recess stamping assembly 300. The concave die 100 has a cavity portion 110, and the cavity wall of the cavity portion 110 has a relief groove 120. The convex die 200 has a protruding core portion 210 corresponding to the cavity portion 110, and the protruding core portion 210 has a mounting hole 220, which is correspondingly and opposite to the relief groove 120. The arc-shaped recess stamping assembly 300 includes a die base 310, two punch blocks 320, and a punch block driving mechanism 330. The die base 310 is mounted in the mounting hole 220. The two punch blocks 320 are coaxially hinged to the die base 310. Each punch block 320 is provided with an arc-shaped stamping part 321, which protrudes from the die surface of the convex core part 210 and is correspondingly positioned opposite to the relief groove 120. The two punch blocks 320 have an engaged state and an open state: in the engaged state... In the open state, one end of the arc-shaped stamping portion 321 of the two punches 320 abuts against each other to form an arc-shaped protrusion; in the open state, the arc-shaped stamping portions 321 of the two punches 320 are moved away from each other by a predetermined distance along the circumferential direction of the hinge axis of the two punches 320; a stepped stamping surface 322 is provided at the end of the two arc-shaped stamping portions 321 that are moved away from each other; the punch driving mechanism 330 is provided on the die holder 310 and is used to control the two punches 320 to switch between the mating state and the open state.

[0024] When producing the arc-shaped battery film housing 1, the two punches 320 are first kept in an engaged state. The aluminum-plastic film is placed between the concave mold 100 and the convex mold 200, so that the concave mold 100 and the convex mold 200 are closed, and the convex core part 210 and the concave cavity part 110 are closed to form the aluminum-plastic film into an arc-shaped battery film housing 1. The arc-shaped stamping parts 321 of the two punches 320 in the engaged state are combined to form an arc-shaped convex strip structure, and further stamping is performed on the inner wall of the arc-shaped battery film housing 1 to form an arc-shaped recess 2. Then, through stamping... The block drive mechanism 330 drives the two punch blocks 320 from the mating state to the open state, causing the arc-shaped stamping portions 321 of the two punch blocks 320 to move away from each other. The stepped stamping surfaces 322 extend and expand outwards at both ends of the arc-shaped recess 2, forming a stepped structure. This effectively ensures the integrity of the arc-shaped recess 2, providing ample installation space at both ends for the core to be inserted, facilitating subsequent core assembly and encapsulation, and improving the quality of subsequent core assembly and encapsulation. After molding, the punch drive mechanism 330 resets the two punch blocks 320 to the mating state, thus not affecting demolding. For the arc-shaped battery film shell 1 formed by the above mold, please refer to... Figure 10 and Figure 11 As shown.

[0025] In one embodiment, the clearance groove 120 is a through groove that allows the arc-shaped stamping part 321 to be accommodated. In other embodiments, the clearance groove 120 is not limited to a through groove; for example, it can also be a cavity adapted to the arc-shaped stamping part 321. The specific configuration can be made according to the actual situation.

[0026] In this embodiment, the arc-shaped stamping part 321 has an arc-shaped profile surface 323, which is a circular arc surface and whose center coincides with the hinge axis of the two stamping blocks 320. With the above structure, the two stamping blocks 320 can smoothly move away from each other and be pushed apart.

[0027] In this embodiment, the stepped stamping surface 322 is the end face of the arc-shaped stamping part 321. This end face is planar, and its extension surface passes through the hinge axis of the two stamping blocks 320. With the above structure, the stepped stamping surface 322 can be stamped to form a right-angle platform, which makes it more convenient for the subsequent assembly of the core.

[0028] In this embodiment, one end of the die holder 310 is provided with an adapter die surface 311, which is flush with the die surface of the protruding core 210. The adapter die surface 311 is provided with a punch block setting hole 312, and two punch blocks 320 are disposed in the punch block setting hole 312. The arc-shaped stamping portions 321 of the two punch blocks 320 protrude from the punch block setting hole 312 and protrude from the adapter die surface 311. The adapter die surface 311 is a cylindrical surface, and at least a portion of the arc-shaped stamping portion 321 is an arc-shaped piece. The arc-shaped piece is adapted to the cylindrical surface and slides with it. The center of the cylindrical surface coincides with the hinge axis of the two punch blocks 320. With the above structure, the two punch blocks 320 can move stably and smoothly engage and disengage with each other.

[0029] In this embodiment, the punch drive mechanism 330 includes a drive member 331, a punch reset elastic structure 332, and a drive member reset elastic structure 333. The punch 320 includes a pivot portion 324 and a linkage portion 325. The linkage portion 325 and the arc-shaped punching portion 321 are connected to both sides of the pivot portion 324. The two punches 320 are cross-hinged through the pivot portion 324. The punch reset elastic structure 332 is disposed on the die holder 310 and is used to make the two linkage portions 325 tend to move closer to each other. The drive member 331 is telescopically and movably disposed on the die holder 310. The drive member 331 is provided with a pressing portion 3311. The position of the top pressing part 3311 corresponds to that of the two linkage parts 325, and it can be inserted into and withdrawn from the position between the two linkage parts 325. When the top pressing part 3311 is inserted into the position between the two linkage parts 325, it can open the two linkage parts 325 and cause the two punches 320 to enter the open state. When the top pressing part 3311 withdraws from the position between the two linkage parts 325, the two linkage parts 325 move closer to each other through the punch reset elastic structure 332 and cause the two punches 320 to enter the engaged state. The drive member reset elastic structure 333 is provided on the die holder 310 and is used to make the drive member 331 tend to withdraw from the position between the two linkage parts 325. Before production, the two punches 320 are kept in the engaged state by the drive member reset elastic structure 333 and the punch reset elastic structure 332. During production, after the die 100 and punch 200 are closed, the driving component 331 is activated. The pressing part 3311 of the driving component 331 inserts between the two linkage parts 325, thus opening the two linkage parts 325, similar to a scissor structure. The opened linkage parts 325 then move the two arc-shaped stamping parts 321 away from each other, thus entering the open state. After production is completed, the driving component 331 and the punch 320 are reset by the driving component reset elastic structure 333 and the punch reset elastic structure 332, respectively. The aforementioned punch drive mechanism 330 is ingeniously designed, simple in structure, and easy to implement.

[0030] In one embodiment, the pivot portions 324 of the two punch blocks 320 are hinged together by a pin 340, which can be pivotally connected to the die holder 310, so that the two punch blocks 320 can rotate stably relative to each other. In another embodiment, the two punch blocks 320 are cross-hinged by the pivot portions 324, that is, the arc-shaped stamping portions 321 of the two punch blocks 320 are arranged left and right, while the linkage portions 325 of the two punch blocks 320 are arranged right and left, thus forming a structure similar to scissors.

[0031] In this embodiment, the driving member 331 is a push rod structure. The driving member 331 extends along the mold opening and closing direction and slides on the die holder 310 along the same direction. The driving member 331 is located on the side of the two punches 320 away from the die cavity 100. A pressing part 3311 is located at the end of the driving member 331 near the two punches 320. A pushing part 3312 is located at the end of the driving member 331 away from the two punches 320. When the pressing part 3311 retracts from the position between the two linkage parts 325, the pushing part 3312 extends relative to the die holder 310 and the punch 200 in a direction away from the die cavity 100. With this structure, the driving member 331 can be driven by driving the pushing part 3312 along the mold opening and closing direction. The driving structure is simple and convenient for the stamping machine. In this embodiment, the mold opening and closing direction is shown by double arrow A in the attached figure.

[0032] In this embodiment, when the two linkage parts 325 approach each other via the punch-block reset elastic structure 332, they are mutually limited and an insertion gap 334 is formed between them. The pressing part 3311 includes a front insertion section 3311a and a spreading section 3311b. The front insertion section 3311a is located at the end of the pushing part 3312 and is correspondingly positioned to the insertion gap 334. The front insertion section 3311a is adapted to be inserted into the insertion gap 334. The spreading section 3311b is adjacent to the front insertion section 3311a. Guide surfaces are respectively provided on both sides of the spreading section 3311b for corresponding sliding cooperation with the two linkage parts 325. The guide surfaces are used to guide the two linkage parts 325 away from each other. The driving member 331 spreads the two linkage parts 325 through the above structure, which is simple in structure and smooth in operation. In this embodiment, when the two linkage parts 325 approach each other, they are mutually limited by abutting each other.

[0033] In this embodiment, the guide surface includes a primary inclined surface 3311c and a secondary inclined surface 3311d. One end of the primary inclined surface 3311c is connected to the front insertion section 3311a, and one end of the secondary inclined surface 3311d is connected to the other end of the primary inclined surface 3311c. The angle between the primary inclined surface 3311c and the mold opening / closing direction is greater than the angle between the secondary inclined surface 3311d and the mold opening / closing direction. Using this structure, a two-stage guide can be formed, resulting in smoother and more stable movement of the punch block 320.

[0034] It is conceivable that the guiding surface is not limited to the structure described above. For example, the guiding surface may be a single inclined plane or an arc-shaped surface, and the specific configuration can be made according to the actual situation.

[0035] In this embodiment, the punch reset elastic structure 332 includes two first springs 3321 corresponding to the two linkage parts 325. The two ends of the first springs 3321 abut against the corresponding linkage part 325 and the die holder 310. It is conceivable that the punch reset elastic structure 332 is not limited to the structure of the two first springs 3321 described above. For example, a torsion spring can also be used, and the specific configuration can be made according to the actual situation.

[0036] In this embodiment, the drive member reset elastic structure 333 includes two second springs 3331. Spring abutment portions corresponding to the two second springs 3331 extend from both sides of the drive member 331. The two ends of the second springs 3331 abut against the corresponding spring abutment portions and the die holder 310, respectively. It is conceivable that the drive member reset elastic structure 333 is not limited to using the aforementioned second springs 3331; for example, it could also be a spring sheet or a tension spring, and the specific configuration can be determined according to the actual situation.

[0037] In this embodiment, the die 100 is provided with stepped stamping mating surfaces 130 that correspond one-to-one with the stepped stamping surfaces 322 of the arc-shaped stamping portion 321. When the die is closed and the two stamping blocks 320 are in the open state, the stepped stamping surfaces 322 and the stepped stamping mating surfaces 130 correspond to each other. With the above structure, the forming effect at both ends of the arc-shaped recess 2 is good and the structure is regular.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An arc-shaped battery can shell rotary-pressing die, characterized in that, include: The die (100) is provided with a cavity (110), and the cavity wall of the cavity (110) is provided with a relief groove (120). The punch (200) is provided with a core portion (210) corresponding to the cavity portion (110), and a mounting hole (220) is provided at the core portion (210), and the mounting hole (220) is correspondingly and opposite to the relief groove (120); An arc-shaped recessed stamping assembly (300) includes a die base (310), two punch blocks (320), and a punch block driving mechanism (330). The die base (310) is mounted in the mounting hole (220). The two punch blocks (320) are coaxially hinged to the die base (310). Each punch block (320) is provided with an arc-shaped stamping part (321). The arc-shaped stamping part (321) protrudes from the die surface of the convex core part (210) and is correspondingly opposite to the relief groove (120). The two punch blocks (320) have an engaged state and an open state. In the mating state, one end of the arc-shaped stamping portion (321) of the two punches (320) abuts against each other to form an arc-shaped protrusion; in the open state, the arc-shaped stamping portions (321) of the two punches (320) are circumferentially separated from each other by a predetermined distance along the hinge axis of the two punches (320); a stepped stamping surface (322) is provided at the separated ends of the two arc-shaped stamping portions (321); the punch driving mechanism (330) is disposed on the die holder (310) and is used to control the two punches (320) to switch between the mating state and the open state.

2. The arc-shaped battery film shell rotary stamping die according to claim 1, characterized in that: The arc-shaped stamping part (321) has an arc-shaped profile (323), which is a circular arc surface and whose center coincides with the hinge axis of the two stamping blocks (320).

3. The arc-shaped battery film shell rotary stamping die according to claim 1 or 2, characterized in that: The stepped stamping surface (322) is the end face of the arc-shaped stamping part (321), the end face is a plane and the extension surface of the end face passes through the hinge axis of the two stamping blocks (320).

4. The rotary piercer mold for an arched battery film can as defined in claim 1, wherein: One end of the die holder (310) is provided with an adapter die surface (311), which is flush with the die surface of the protruding core (210). The adapter die surface (311) is provided with a punch block setting hole (312), and two punch blocks (320) are provided in the punch block setting hole (312). The arc-shaped stamping part (321) of the two punch blocks (320) protrudes out of the punch block setting hole (312) and protrudes from the adapter die surface (311). The adapter die surface (311) is a cylindrical surface, and at least a part of the arc-shaped stamping part (321) is an arc-shaped piece. The arc-shaped piece is adapted to the cylindrical surface and slides with it. The center of the cylindrical surface coincides with the hinge axis of the two punch blocks (320).

5. The rotary piercer mold for an arched battery film can as defined in claim 1, wherein: The punch drive mechanism (330) includes a drive member (331), a punch return elastic structure (332), and a drive member return elastic structure (333). The punch (320) includes a pivot part (324) and a linkage part (325). The linkage part (325) and the arc-shaped stamping part (321) are connected to both sides of the pivot part (324). The two punches (320) are cross-hinged through the pivot part (324). The punch return elastic structure (332) is disposed on the die holder (310) and is used to make the two linkage parts (325) tend to move closer to each other. The drive member (331) is telescopically disposed on the die holder (310). The drive member (331) is provided with a pressing part (3311). 1) The position is corresponding to the position between the two linkage parts (325) and can be inserted and withdrawn between the two linkage parts (325). When the top pressing part (3311) is inserted between the two linkage parts (325), it can open the two linkage parts (325) and make the two punches (320) enter the opened state. When the top pressing part (3311) withdraws from the position between the two linkage parts (325), the two linkage parts (325) move closer to each other through the punch reset elastic structure (332) and make the two punches (320) enter the mating state. The drive member reset elastic structure (333) is provided on the die holder (310) and is used to make the drive member (331) have a tendency to withdraw from the position between the two linkage parts (325).

6. The rotary die for a curved battery film can shell according to claim 5, characterized in that: The driving member (331) is a push rod structure. The driving member (331) extends along the mold opening and closing direction and slides along the mold opening and closing direction on the punch base (310). The driving member (331) is located on the side of the two punches (320) away from the die (100). The top pressing part (3311) is located at one end of the driving member (331) close to the two punches (320). The driving member (331) is provided with a push part (3312) at one end away from the two punches (320). When the top pressing part (3311) is out of position between the two linkage parts (325), the push part (3312) extends relative to the punch base (310) and the punch (200) in a direction away from the die (100).

7. The rotary die for a curved battery can shell according to claim 6, characterized by: When the two linkage parts (325) approach each other through the punch block reset elastic structure (332), they are mutually limited and an insertion gap (334) is formed between them. The pressing part (3311) includes a front insertion section (3311a) and a spreading section (3311b). The front insertion section (3311a) is disposed at the end of the pushing part (3312) and is correspondingly disposed with respect to the insertion gap (334). The front insertion section (3311a) is adapted to be inserted into the insertion gap (334). The spreading section (3311b) is adjacent to the front insertion section (3311a). The two sides of the spreading section (3311b) are respectively provided with guide surfaces for corresponding sliding cooperation with the two linkage parts (325). The guide surfaces are used to guide the two linkage parts (325) away from each other.

8. The rotary die for a curved battery film can shell according to claim 7, characterized in that: The guide surface includes a primary inclined surface (3311c) and a secondary inclined surface (3311d). One end of the primary inclined surface (3311c) is connected to the front insertion section (3311a), and one end of the secondary inclined surface (3311d) is connected to the other end of the primary inclined surface (3311c). The angle between the primary inclined surface (3311c) and the mold opening and closing direction is greater than the angle between the secondary inclined surface (3311d) and the mold opening and closing direction.

9. The arc-shaped battery film shell rotary stamping die according to claim 5, characterized in that: The punch reset elastic structure (332) includes two first springs (3321) corresponding to the two linkage parts (325) respectively. The two ends of the first springs (3321) abut against the corresponding linkage part (325) and the punch die base (310). The drive member reset elastic structure (333) includes two second springs (3331). The two sides of the drive member (331) have spring abutment parts corresponding to the two second springs (3331) respectively. The two ends of the second springs (3331) abut against the corresponding spring abutment parts and the punch die base (310) respectively.

10. The rotary piercer mold for an arched battery film can according to claim 1, wherein: The die (100) is provided with a stepped stamping mating surface (130) that corresponds one-to-one with the stepped stamping surface (322) of the arc-shaped stamping part (321). When the die is closed, the two punches (320) are in the open state, and the stepped stamping surface (322) and the stepped stamping mating surface (130) correspond one-to-one.

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