Battery shell variable cross-section stamping die based on wall thickness adjusting structure

Abstract

The present application relates to the technical field of punch die, in particular to a variable cross-section punch die for battery shell based on wall thickness adjusting structure, which comprises a table pan and a slide plate movably installed above the table pan, a plurality of lower dies are installed on the top of the table pan in equal distance, and a punch mechanism is installed on the bottom of the slide plate. The present application sets the variable diameter upper die, when producing battery shells with different wall thickness, the locking assembly is unlocked to the sub-mold, the lifting assembly drives the sub-mold to move upward, the diameter of the upper die is reduced, when the upper die moves downward and cooperates with the lower die for punching, the cavity formed between the upper die with reduced diameter and the lower die is larger, which can punch out battery shells with larger wall thickness, and the diameter of the upper die is changed to produce battery shells with different wall thickness, without the need to manufacture and replace upper dies with different sizes, which improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping die, in particular to a battery shell variable cross-section stamping die based on wall thickness adjusting structure. BACKGROUND

[0002] The battery shell is an important component for protecting the internal structure of the battery, which can prevent the battery from being affected by external force impact, corrosion, overheating, etc., and ensure the safe and stable operation of the battery. The battery shell is generally made of plastic, metal or composite material.

[0003] The battery shell made of metal material is generally processed by stamping, that is, the metal plate strip is processed into a product with a specific size, shape and depth through a special die through the processes of blanking, multiple stretching and cutting. In the process of battery shell production and processing, due to the difference of metal materials, there is a certain difference in ductility and structural strength of different metals. In order to consider the strength and heat dissipation effect of the battery shell, when different metal materials are used to produce the battery shell, different wall thicknesses are often needed. The upper die and the lower die of the existing stamping die are used one by one, and a set of die can only process a battery shell with a certain wall thickness. When producing battery shells with different wall thicknesses, corresponding dies need to be processed by re-opening the mold, and then the mold needs to be replaced on the stamping machine for production and processing. The cost of re-opening the mold is high, and the time spent on replacement is long, which affects the production efficiency of the battery shell. SUMMARY

[0004] In order to solve the above problems, the present application provides a battery shell variable cross-section stamping die based on wall thickness adjusting structure, which comprises a table disc and a slide plate movably installed above the table disc, a plurality of lower dies are installed on the top of the table disc in equal distance, and a stamping mechanism is installed on the bottom of the slide plate.

[0005] The stamping mechanism comprises an upper die seat fixedly installed on the bottom of the slide plate, a plurality of upper dies corresponding to the lower dies are fixedly installed on the bottom of the upper die seat, a sub-die for increasing the diameter of the upper die is movably sleeved on the outer ring wall of the upper die, the bottom of the sub-die is flush with the bottom of the upper die, a locking assembly for fixing the sub-die is installed on the upper die, and a lifting assembly for driving the sub-die to move up and down is installed on the bottom of the upper die seat.

[0006] The top of the sub-die is fixedly installed with a positioning block, the locking assembly comprises a plurality of locking blocks which are slidably installed in the upper die in the radial direction and are uniformly distributed in the circumferential direction, one end of the locking block away from the center of the upper die is inserted into the inside of the positioning block, and the inside of the upper die is installed with a contraction unit for driving the locking block to move towards the center of the upper die.

[0007] In a possible implementation, the bottom of the upper die seat is further provided with a stripping assembly corresponding to the upper die, the stripping assembly comprises a movable plate movably sleeved on the outside of the sub-die, a plurality of elastic telescopic rods are fixedly connected between the top of the movable plate and the bottom of the upper die seat and symmetrically distributed about the upper die, a stripping cylinder is fixedly connected to the bottom of the movable plate and movably sleeved on the outside of the sub-die.

[0008] In a possible implementation, the contraction unit comprises a rotating disc rotatably installed in the upper die and located above the locking block, a plurality of arc-shaped grooves are uniformly distributed on the rotating disc, the top of one end of the locking block close to the center of the upper die is rotatably connected with a movable rod, the movable rod is slidably installed in the arc-shaped groove, and the inside of the upper die seat is further provided with a driving unit for driving the plurality of rotating discs to synchronously rotate.

[0009] In a possible implementation, the driving unit comprises a plurality of gears rotatably installed in the upper die seat and equidistantly distributed left and right, a transmission rod is fixedly connected between the bottom of the gear and the top of the rotating disc in a same axis, the transmission rod is rotatably connected with the upper die seat and the upper die, a toothed frame is slidably installed on the upper die seat left and right, the plurality of gears are all in mesh with the toothed frame, and the bottom of the sliding plate is fixedly installed with an electric telescopic rod one for pushing the toothed frame to move left and right.

[0010] In a possible implementation, the lifting assembly comprises an upper cross rod fixedly installed on the bottom of the upper die seat and symmetrically distributed front and back, a lower cross rod movably installed on the bottom of the upper cross rod, a plurality of positioning blocks fixedly connected with the lower cross rod, a scissor frame installed between the upper cross rod and the corresponding lower cross rod, and a sliding groove provided on the side of the upper cross rod and the lower cross rod away from the upper die and used for sliding the left upper end and the left lower end of the scissor frame, respectively, an electric telescopic rod two fixedly installed on the left side of the upper die seat and located on the bottom of the sliding plate, a concave frame fixedly connected to the right side of the telescopic section of the electric telescopic rod two, and the right end of the concave frame rotatably connected with the left upper end of the scissor frame.

[0011] In a possible implementation, the bottom of the upper die seat is further provided with a limiting assembly for limiting the lower cross rod, the limiting assembly comprises a support frame slidably installed on the bottom of the upper die seat and symmetrically distributed front and back, the support frame is supported on the top of the corresponding lower cross rod, and the upper die seat is further provided with a displacement unit for driving the support frame to move away from the center of the upper die seat.

[0012] In a possible implementation manner, the displacement unit comprises wedge-shaped blocks symmetrically arranged on the bottom of the upper die seat and sliding forward and backward, the support frame is fixedly arranged on the bottom of the wedge-shaped blocks, the bottom of the upper die seat is fixedly connected with a stop sheet located on the side of the wedge-shaped blocks away from the center of the upper die seat, the reset spring two is fixedly connected between the wedge-shaped blocks and the stop sheet, and the bottom of the upper die seat is slidingly arranged with the pushing block used for pushing the wedge-shaped blocks to slide away from the center of the upper die seat.

[0013] In a possible implementation manner, the left side of the telescopic section of the electric telescopic rod is fixedly connected with the push rod, the right end of the tooth frame is slidingly connected to the right side of the upper die seat and then fixedly connected with the fixed plate, the left end of the push rod is slidingly connected to the left side of the fixed plate and then fixedly connected with the pushing block, and the reset spring one is fixedly connected between the left side of the telescopic section of the electric telescopic rod and the right side of the fixed plate.

[0014] The present application has the following beneficial effects: 1. The present application sets the upper die with variable diameter. When the battery shell with different wall thickness is produced, the locking assembly is unlocked to the sub-mold, the sub-mold is driven upward by the lifting assembly, the diameter of the upper die is reduced, the cavity formed between the upper die and the lower die is larger when the upper die moves downward and cooperates with the lower die to stamp, the battery shell with larger wall thickness can be stamped, the battery shell with different wall thickness is produced by changing the diameter of the upper die, different size upper dies do not need to be manufactured and replaced, and the production efficiency is improved.

[0015] 2. The locking assembly and the limiting assembly are cooperated to respectively implement double locking and limiting of the sub-mold and the lifting assembly, the locking block is inserted into the inside of the positioning block, the sub-mold is locked with the upper die, the support frame is supported on the top of the lower horizontal rod, the upward movement of the lower horizontal rod is prevented, the relative sliding between the sub-mold and the upper die when the upper die and the sub-mold stamp the battery shell is avoided, and the stability of the cooperation between the sub-mold and the upper die is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the stamping mechanism of the present application.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of the material removing assembly of the present application.

[0019] Figure 4 It is a left side sectional view of the upper die of the present application.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the locking assembly of the present application.

[0021] Figure 6It is a schematic diagram of the three-dimensional structure of the driving unit of the application.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the lifting assembly of the application.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the limiting assembly of the application.

[0024] In the figure: 1, table; 2, slide plate; 3, lower die; 4, stamping mechanism; 41, upper die seat; 42, upper die; 43, material removal assembly; 431, movable plate; 432, elastic telescopic rod; 433, material removal cylinder; 44, auxiliary die; 441, positioning block; 45, locking assembly; 451, locking block; 452, contraction unit; 4521, rotating disc; 4522, arc-shaped groove; 4523, movable rod; 453, driving unit; 4531, gear; 4532, transmission rod; 4533, gear frame; 4534, electric telescopic rod one; 4535, push rod; 4536, fixed plate; 4537, reset spring one; 46, lifting assembly; 461, upper cross rod; 462, lower cross rod; 463, scissor frame; 464, sliding groove; 465, electric telescopic rod two; 466, concave frame; 47, limiting assembly; 471, support frame; 472, displacement unit; 4721, wedge-shaped block; 4722, baffle; 4723, reset spring two; 4724, pushing block. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] Please refer to Figure 1 - Figure 8 A battery shell variable cross-section stamping die based on a wall thickness adjusting structure, comprising a table 1 and a slide plate 2 movably mounted above the table 1, a plurality of lower dies 3 are installed on the top of the table 1 in equal distance from left to right, and a stamping mechanism 4 is installed on the bottom of the slide plate 2. It should be noted that the slide plate 2 is a structure of the prior art, and the stamping process is implemented by moving the slide plate 2 up and down by the existing stamping machine.

[0027] The stamping mechanism 4 comprises an upper die seat 41 fixedly installed at the bottom of the slide plate 2, the bottom of the upper die seat 41 is fixedly installed with a plurality of upper dies 42 corresponding to the lower dies 3, the upper dies 42 are matched with the corresponding lower dies 3, the outer ring wall of the upper dies 42 movably sheaths a sub die 44 for increasing the diameter thereof, the bottom of the sub die 44 is flush with the bottom of the upper die 42, the upper die 42 is installed with a locking assembly 45 for fixing the sub die 44, the bottom of the upper die seat 41 is installed with a lifting assembly 46 for driving the sub die 44 to move up and down.

[0028] The top of the sub die 44 is fixedly installed with a positioning block 441, the locking assembly 45 comprises a plurality of locking blocks 451 slidably installed in the inner portion of the upper die 42 and uniformly distributed in the circumferential direction, one end of the locking blocks 451 away from the center of the upper die 42 is inserted into the inner portion of the positioning block 441, the inner portion of the upper die 42 is installed with a contraction unit 452 for driving the locking blocks 451 to move towards the center of the upper die 42.

[0029] In specific use, the blank is placed on the corresponding lower die 3, the upper die seat 41 and the upper die 42 are driven by the slide plate 2 to move downwards, the upper die 42 is matched with the corresponding lower die 3 in a clearance fit, and the blank is gradually stamped and processed into a battery shell. When battery shells with different wall thicknesses are to be processed, the locking blocks 451 are driven by the contraction unit 452 to move towards the center of the upper die 42, the end of the locking blocks 451 is separated from the positioning block 441 to be unlocked, then the sub die 44 is driven by the lifting assembly 46 to move upwards, the diameter of the bottom end of the upper die 42 is reduced, and then the upper die 42 is matched with the corresponding lower die 3 to stamp the battery shell, the cavity formed between the upper die 42 and the lower die 3 is larger, and the battery shell with a larger wall thickness can be stamped out. By changing the diameter of the upper die 42, battery shells with different wall thicknesses can be produced, and different sizes of upper dies 42 do not need to be manufactured and replaced, thereby improving the production efficiency.

[0030] Please refer to Figure 1 - Figure 4 The bottom of the upper die seat 41 is also installed with a stripping assembly 43 corresponding to the upper dies 42, the stripping assembly 43 comprises a movable plate 431 movably sheathed outside the sub die 44, the top of the movable plate 431 is fixedly connected with elastic extension rods 432 symmetrically distributed about the upper dies 42 between the bottom of the upper die seat 41, the bottom of the movable plate 431 is fixedly connected with a stripping cylinder 433, and the stripping cylinder 433 is movably sheathed outside the sub die 44.

[0031] Specifically, when the upper die holder 41 drives the upper die 42 to move downward to cooperate with the lower die 3 to stamp the blank, the upper die holder 41 drives the movable plate 431 to move downward together, the upper die 42 contacts the top of the blank, the material removal cylinder 433 is pressed on the top of the blank, then the upper die holder 41 drives the upper die 42 to continue to move downward to stamp the blank into the inside of the lower die 3, so that the blank is gradually formed. At this time, the movable plate 431 and the material removal cylinder 433 no longer continue to move downward, the elastic expansion rod 432 is contracted under the extrusion of the upper die holder 41, after the blank is formed, the upper die holder 41 drives the upper die 42 to move upward, at this time, the elastic expansion rod 432 is used to push the movable plate 431 and the material removal cylinder 433 downward by the elastic restoring force, the material removal cylinder 433 is used to press on the top of the battery shell, so that the battery shell is separated from the upper die 42, and the battery shell is prevented from moving upward together with the upper die 42.

[0032] When the battery shell is completely separated from the upper die 42, the bottom of the upper die 42 moves to be flush with the bottom of the material removal cylinder 433, at this time, the elastic expansion rod 432 returns to the maximum length, then the upper die holder 41 drives the movable plate 431, the elastic expansion rod 432 and the upper die 42 to move upward together through the material removal cylinder 433.

[0033] Please refer to Figure 4 and Figure 5 , the contraction unit 452 includes a rotating disc 4521 rotatingly installed in the inside of the upper die 42 and located above the locking block 451, a plurality of arc-shaped grooves 4522 are arranged on the rotating disc 4521 and uniformly distributed in the circumferential direction, the locking block 451 is rotationally connected with a movable rod 4523 at the top of one end of the locking block 451 close to the center of the upper die 42, the movable rod 4523 is slidingly installed in the inside of the arc-shaped groove 4522, and the inside of the upper die holder 41 is further provided with a driving unit 453 for driving a plurality of rotating discs 4521 to rotate synchronously.

[0034] Specifically, the positioning block 441 is locked by the locking block 451, the secondary die 44 is fixed with the upper die 42, the secondary die 44 is prevented from relatively sliding with the upper die 42 when the battery shell is stamped, and the stability of the secondary die 44 cooperating with the upper die 42 is improved.

[0035] When the locking of the positioning block 441 by the locking block 451 is to be released, the rotating disc 4521 is driven by the driving unit 453 to rotate counterclockwise, the movable rod 4523 is guided by the arc-shaped groove 4522 on the rotating disc 4521 to move toward the center of the rotating disc 4521, the locking block 451 is driven by the movable rod 4523 to move toward the center of the upper die 42, the end of the locking block 451 is separated from the positioning block 441, so that the locking of the positioning block 441 is released, the secondary die 44 can move upward, and the diameter of the upper die 42 is conveniently adjusted.

[0036] Conversely, when the locking of the positioning block 441 is needed, the same driving unit 453 drives the rotating disc 4521 to rotate clockwise, so that the arc-shaped groove 4522 guides the movable rod 4523 to move away from the center of the rotating disc 4521, and the movable rod 4523 drives the locking block 451 to move away from the center of the upper mold 42, so that the end of the locking block 451 is reinserted into the inside of the positioning block 441 to implement the locking.

[0037] Please refer to Figure 2 - Figure 6 The driving unit 453 comprises a plurality of gears 4531 rotatably installed inside the upper mold base 41 and equidistantly distributed left and right, a transmission rod 4532 coaxially and fixedly connected between the bottom of the gear 4531 and the top of the rotating disc 4521, the transmission rod 4532 being rotatably connected with the upper mold base 41 and the upper mold 42, a toothed frame 4533 being slidably installed on the upper mold base 41 left and right, and the plurality of gears 4531 being engaged with the toothed frame 4533. The bottom of the sliding plate 2 is fixedly installed with an electric telescopic rod one 4534 for pushing the toothed frame 4533 to move left and right.

[0038] Specifically, when the rotating disc 4521 is to be counterclockwise rotated for unlocking, the toothed frame 4533 is pushed to move left by the electric telescopic rod one 4534, the gear 4531 is counterclockwise rotated by the toothed frame 4533, the rotating disc 4521 is counterclockwise rotated by the gear 4531 through the transmission rod 4532, and the locking block 451 is unlocked. Conversely, the toothed frame 4533 is pushed to move right by the electric telescopic rod one 4534, the gear 4531 is clockwise rotated, the rotating disc 4521 is clockwise rotated, the locking block 451 is locked, the plurality of gears 4531 are simultaneously rotated by the toothed frame 4533, and the plurality of locking blocks 451 are simultaneously unlocked or locked, thereby improving the switching efficiency.

[0039] Please refer to Figure 2 and Figure 7 The lifting assembly 46 comprises an upper cross rod 461 fixedly installed at the bottom of the upper mold base 41 and symmetrically distributed front and back, a lower cross rod 462 movably installed at the bottom of the upper cross rod 461, a plurality of positioning blocks 441 fixedly connected with the lower cross rod 462, a scissor frame 463 installed between the upper cross rod 461 and the corresponding lower cross rod 462, and a slide groove 464 formed in the side of the upper cross rod 461 and the lower cross rod 462 away from the upper mold 42 and used for sliding the left upper end and the left lower end of the scissor frame 463. The bottom of the sliding plate 2 is fixedly installed with an electric telescopic rod two 465 located at the left side of the upper mold base 41, the right side of the telescopic section of the electric telescopic rod two 465 is fixedly connected with a concave frame 466, and the right end of the concave frame 466 is rotatably connected with the left upper end of the scissor frame 463.

[0040] In specific use, the concave frame 466 is driven to move left by the electric telescopic rod two 465, the upper left end of the scissor frame 463 is driven to move left by the concave frame 466, the lower horizontal rod 462 is driven to move up by the scissor frame 463, and the plurality of positioning blocks 441 and the secondary mold 44 are driven to move up together by the lower horizontal rod 462, so as to reduce the diameter of the bottom end of the upper mold 42, and the wall thickness of the battery shell produced by the upper mold 42 is relatively thick.

[0041] When a battery shell with a smaller wall thickness is to be produced, the concave frame 466 is driven to move right by the electric telescopic rod two 465, the lower horizontal rod 462 is driven to move down by the scissor frame 463, and the secondary mold 44 is driven to move down and re-set on the bottom end of the upper mold 42, so as to increase the diameter of the upper mold 42, and the wall thickness of the battery shell produced by the upper mold 42 is relatively thin.

[0042] Please refer to Figure 2 , Figure 7 and Figure 8 , the bottom of the upper mold seat 41 is also provided with a limiting assembly 47 for limiting the lower horizontal rod 462, the limiting assembly 47 comprises support frames 471 symmetrically distributed in front and back and slidingly installed on the bottom of the upper mold seat 41, the support frames 471 are supported on the top of the corresponding lower horizontal rod 462, and the upper mold seat 41 is also provided with a displacement unit 472 for driving the support frames 471 to move away from the center of the upper mold seat 41.

[0043] In specific use, when the secondary mold 44 is set on the bottom end of the upper mold 42, the support frames 471 are supported on the top of the lower horizontal rod 462, the lower horizontal rod 462 is further supported and limited by the support frames 471, the stability of the lower horizontal rod 462 supporting the positioning blocks 441 is improved, and the relative sliding between the secondary mold 44 and the upper mold 42 in the process of stamping is avoided, so as to ensure the consistency of the secondary mold 44 and the upper mold 42.

[0044] Please refer to Figure 7 and Figure 8 , the displacement unit 472 comprises wedge-shaped blocks 4721 symmetrically distributed in front and back and slidingly installed on the bottom of the upper mold seat 41, the support frames 471 are fixedly installed on the bottom of the wedge-shaped blocks 4721, the bottom of the upper mold seat 41 is fixedly connected with a baffle 4722 located on the side of the wedge-shaped blocks 4721 away from the center of the upper mold seat 41, a reset spring two 4723 is fixedly connected between the wedge-shaped blocks 4721 and the baffle 4722, and the bottom of the upper mold seat 41 is slidingly installed with a pushing block 4724 for driving the wedge-shaped blocks 4721 to slide away from the center of the upper mold seat 41, and the side of the pushing block 4724 facing the wedge-shaped blocks 4721 is provided with an inclined surface.

[0045] Specific use, before driving the sub-mold 44 upward, first drive the pushing block 4724 to the left, the use of pushing block 4724 slope to push the wedge block 4721 to move away from the center of the upper die seat 41 direction, at this time the reset spring two 4723 is compressed shrink, the use of wedge block 4721 drive support frame 471 to move away from the center of the upper die seat 41 direction, so that the support frame 471 from the upper horizontal rod 462 above no longer limit, then drive the horizontal rod 462 upward can drive the sub-mold 44 upward.

[0046] When the horizontal rod 462 drive sub-mold 44 downward and re-set to the bottom of the upper die 42, by driving the pushing block 4724 to the right, so that the pushing block 4724 no longer push the wedge block 4721, at this time the wedge block 4721 in the reset spring two 4723 rebound under the push of the direction close to the center of the upper die seat 41, the use of wedge block 4721 drive support frame 471 to close to the center of the upper die seat 41 direction and re-support in the top of the horizontal rod 462, can be again on the horizontal rod 462 limit.

[0047] Please refer to Figure 7 and Figure 8 , the left side of the telescopic section of the electric telescopic rod one 4534 is fixedly connected with the push rod 4535, the right end of the tooth frame 4533 is slidably penetrated to the right side of the upper die seat 41 and then fixedly connected with the fixed plate 4536, the left end of the push rod 4535 is slidably penetrated to the left side of the fixed plate 4536 and then fixedly connected with the pushing block 4724, the left side of the telescopic section of the electric telescopic rod one 4534 and the right side of the fixed plate 4536 are fixedly connected with the reset spring one 4537.

[0048] Specific use, when the telescopic section of the electric telescopic rod one 4534 moves to the left, the telescopic section of the electric telescopic rod one 4534 pushes the push rod 4535 to move to the left, the push rod 4535 pushes the pushing block 4724 to move to the left, at the same time the electric telescopic rod one 4534 pushes the fixed plate 4536 to move to the left through the push rod 4535, the fixed plate 4536 pushes the tooth frame 4533 to move to the left, so that the locking block 451 releases the locking of the positioning block 441, after the locking block 451 is unlocked, the fixed plate 4536 abuts against the right side of the upper die seat 41 and no longer moves to the left, then the electric telescopic rod one 4534 continues to push the push rod 4535 to move to the left, at this time the reset spring one 4537 is compressed shrink, the pushing block 4724 can continue to move to the left and push the wedge block 4721, so that the support frame 471 releases the support limit of the horizontal rod 462.

[0049] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, or slidingly connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] The embodiments of the present specific embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A variable cross-section press die for a battery case based on a wall thickness adjustment structure, comprising, characterized by: A platform (1) and a sliding plate (2) that is movably mounted on the platform (1). The top of the platform (1) is equipped with several lower molds (3) that are equidistantly distributed on the left and right. The bottom of the sliding plate (2) is equipped with a stamping mechanism (4). The stamping mechanism (4) includes an upper die base (41) fixedly installed at the bottom of the slide plate (2). A plurality of upper dies (42) corresponding one-to-one with the lower die (3) are fixedly installed at the bottom of the upper die base (41). A secondary die (44) for increasing its diameter is movably sleeved on the outer ring wall of the upper die (42). The bottom of the secondary die (44) is flush with the bottom of the upper die (42). A locking component (45) for fixing the secondary die (44) is installed on the upper die (42). A lifting component (46) for driving the secondary die (44) to move up and down is installed at the bottom of the upper die base (41). The top of the sub-mold (44) is fixedly installed with a positioning block (441). The locking assembly (45) includes a plurality of locking blocks (451) that are slidably installed inside the upper mold (42) in the radial direction and are evenly distributed in the circumference. One end of the locking block (451) away from the center of the upper mold (42) is inserted into the interior of the positioning block (441). The interior of the upper mold (42) is equipped with a shrinking unit (452) that drives the locking block (451) to move closer to the center of the upper mold (42). The bottom of the upper mold base (41) is also equipped with a stripping component (43) corresponding to the upper mold (42). The stripping component (43) includes a movable plate (431) that is movably sleeved on the outside of the sub-mold (44). The top of the movable plate (431) and the bottom of the upper mold base (41) are fixedly connected with elastic telescopic rods (432) that are symmetrically distributed on the left and right sides of the upper mold (42). The bottom of the movable plate (431) is fixedly connected with a stripping cylinder (433), which is movably sleeved on the outside of the sub-mold (44). The shrinking unit (452) includes a turntable (4521) rotatably mounted inside the upper mold (42) and located above the locking block (451). The turntable (4521) has several arc-shaped grooves (4522) evenly distributed in the circumference. The top of the locking block (451) near the center of the upper mold (42) is rotatably connected to a movable rod (4523). The movable rod (4523) is slidably mounted inside the arc-shaped grooves (4522). The upper mold base (41) is also equipped with a drive unit (453) for driving several turntables (4521) to rotate synchronously. The driving unit (453) comprises a plurality of gears (4531) rotatably mounted inside the upper die seat (41) and equidistantly distributed left and right, transmission rods (4532) are fixedly connected between the bottoms of the gears (4531) and the top of the rotating disc (4521) in a same axis, the transmission rods (4532) are rotatably connected with the upper die seat (41) and the upper die (42), a toothed frame (4533) is slidably mounted on the upper die seat (41) left and right, a plurality of the gears (4531) are engaged with the toothed frame (4533), and the bottom of the sliding plate (2) is fixedly installed with an electric telescopic rod one (4534) for pushing the toothed frame (4533) to move left and right.

2. The variable cross-section punch die for a battery case based on the thickness adjustment structure according to claim 1, characterized in that: The lifting assembly (46) comprises an upper cross rod (461) fixedly installed at the bottom of the upper die seat (41) and symmetrically distributed front and back, a lower cross rod (462) movably installed on the bottom of the upper cross rod (461) up and down, a plurality of the positioning blocks (441) are fixedly connected with the lower cross rod (462), a scissor jack (463) is installed between the upper cross rod (461) and the corresponding lower cross rod (462), the upper cross rod (461) and the lower cross rod (462) are respectively provided with a sliding groove (464) on the side away from the upper die (42) and used for allowing the left upper end and the left lower end of the scissor jack (463) to slide, and the bottom of the sliding plate (2) is fixedly installed with an electric telescopic rod two (465) located at the left side of the upper die seat (41), the right side of the telescopic section of the electric telescopic rod two (465) is fixedly connected with a concave frame (466), and the right end of the concave frame (466) is rotatably connected with the left upper end of the scissor jack (463).

3. The variable cross-section punch die for a battery case based on the thickness adjustment structure according to claim 2, characterized in that: The bottom of the upper die seat (41) is also provided with a limiting assembly (47) for limiting the lower cross rod (462), the limiting assembly (47) comprises support frames (471) slidably installed on the bottom of the upper die seat (41) front and back and symmetrically distributed front and back, the support frames (471) are supported on the top of the corresponding lower cross rod (462), and the upper die seat (41) is also provided with a displacement unit (472) for driving the support frames (471) to move away from the center of the upper die seat (41).

4. The variable cross-section punch die for a battery case based on the thickness adjustment structure according to claim 3, characterized in that: The displacement unit (472) comprises wedge-shaped blocks (4721) slidably installed on the bottom of the upper die seat (41) front and back and symmetrically distributed front and back, the support frames (471) are fixedly installed on the bottom of the wedge-shaped blocks (4721), the bottom of the upper die seat (41) is fixedly connected with a baffle (4722) located on the side of the wedge-shaped blocks (4721) away from the center of the upper die seat (41), a reset spring two (4723) is fixedly connected between the wedge-shaped blocks (4721) and the baffle (4722), and the bottom of the upper die seat (41) is slidably installed with a pushing block (4724) for pushing the wedge-shaped blocks (4721) to slide away from the center of the upper die seat (41).

5. The variable cross-section punch die for a battery case based on the thickness adjustment structure according to claim 4, characterized in that: The left side of the electric telescopic rod one (4534) telescopic section is fixedly connected with a push rod (4535), the right end of the gear frame (4533) is slidably penetrated to the right side of the upper mold base (41) and is fixedly connected with a fixed plate (4536), the left end of the push rod (4535) is slidably penetrated to the left side of the fixed plate (4536) and is fixedly connected with a pushing block (4724), and the left side of the electric telescopic rod one (4534) telescopic section and the right side of the fixed plate (4536) are fixedly connected with a reset spring one (4537).

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