Preparation method of battery negative end cover and mold thereof

Abstract

The present application relates to the technical field of battery negative end cover, and particularly relates to a preparation method of a battery negative end cover and a mold thereof. The present application solves the problems of long production cycle and low product quality of the existing battery end cover. The structure of the battery negative end cover mold comprises a fixed mold and a movable mold, the fixed mold is provided with a die casting hole, the first die casting plate and the second die casting plate are rotatably arranged at the bottom of the die casting hole, and the side wall of the die casting hole is provided with a connecting structure for sealing and closing the die casting hole by the first die casting plate and the second die casting plate when the movable mold is deeply inserted into the die casting hole or opening the die casting hole by the first die casting plate and the second die casting plate when the movable mold is away from the die casting hole. Compared with the prior art, the present application not only significantly reduces the dependence on workers, but also avoids the product quality problems caused by the difference in technical level of workers through the standardized and automated production mode. The product processed by the embodiment has higher machining precision and stronger strength.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery negative end cover, in particular, relates to a kind of battery negative end cover preparation method and its mould. BACKGROUND

[0002] Battery negative end cover is an important part of battery, it is located at the end of battery negative, with electrical connection and sealing protection function of battery.

[0003] In the prior art, in the process of realizing the rapid production of negative end cover, stamping machine is usually used to process the material to be processed. It is through step feeding and partial stamping, so that the negative end cover is still partially connected with the original material after stamping. Then, these parts are moved away from the stamping machine, and the workers manually remove these negative end covers to complete the manufacturing process.

[0004] Although this can realize the rapid processing of end cover, there are still the following problems: since the process of manually removing the negative end cover by workers needs to be added, not only the production cycle of end cover is prolonged, but also the production cost is increased, and the manual removal of negative end cover by workers may cause damage to the negative end cover itself, affecting the product quality. SUMMARY

[0005] The present application provides a kind of battery negative end cover mould, solve the problems of long production cycle and low product quality of existing battery end cover, improve the practicability of equipment.

[0006] The technical scheme of the present application is as follows:

[0007] A kind of battery negative end cover mould,

[0008] Its structure includes fixed mould and movable mould, the fixed mould is provided with die casting hole, the first die casting plate and the second die casting plate are rotated at the bottom of the die casting hole, the connecting structure for the first die casting plate and the second die casting plate to seal and close the die casting hole when the movable mould is deeply into the die casting hole or open the die casting hole when the movable mould is away from the die casting hole is arranged on the side wall of the die casting hole, the connecting structure includes first abutment and second abutting piece, the second sliding groove and the third sliding groove are respectively arranged on both sides of the die casting hole, the first abutment is slidably connected with the second sliding groove, the second abutment is slidably connected with the third sliding groove, the first connecting piece and the second connecting piece are further rotatably connected on the fixed mould, one end of the first connecting piece is slidably connected with the first abutment, the other end of the first connecting piece is rotatably connected with the first die casting plate, one end of the second connecting piece is slidably connected with the second abutment, the other end of the second connecting piece is rotatably connected with the second die casting plate, the die casting hole is provided with discharge hole below the side facing the ground;

[0009] The first abutting piece is a right-angled ladder structure in cross section, a second rotating hole is arranged on the first abutting piece, a first sliding rod is fixed in the second rotating hole, a second sliding hole is arranged on the first connecting piece, the first sliding rod is in sliding connection with the second sliding hole, and the first connecting piece and the second connecting piece are the same in structure;

[0010] The first abutting piece is fixed with a second sliding rod away from the second abutting piece, a limiting plate is arranged away from the side of the pressure casting hole of the second sliding groove, the limiting plate is provided with a second sliding rod in sliding connection, a limiting spring is sleeved on the second sliding rod, the limiting spring is fixedly connected with the first abutting piece and the limiting plate at both ends, respectively, and the second sliding rod is fixed with a limiting piece away from the first abutting piece end.

[0011] Another object of the present application is to provide a preparation method of a battery negative electrode end cover,

[0012] S1: select 30-40 microns of aluminum material, add it to the acetone solution, remove the oil stains and dirt on the surface of the aluminum material;

[0013] S2: according to the actual processing needs, select appropriate movable die and fixed die, and install them on the installation slot and installation hole of the punching machine, respectively;

[0014] S3: place the aluminum material on the punching machine, and start the driving motor to step the aluminum material, when the aluminum material stops transporting, start the telescopic piece to punch the aluminum material;

[0015] S4: after the punching is completed, the movable die is separated from the fixed die, under the action of the limiting spring, the first connecting piece and the second connecting piece respectively with the first pressure casting plate and the second pressure casting plate are rotated to the bottom of the pressure casting hole to open, the punched end cover is separated from the pressure casting hole and flows out from the discharge hole, and the step-by-step transportation realizes adjustable spacing through the driving motor control first step piece and second step piece;

[0016] S5: polish and polish the obtained end cover, and then coat a layer of copper on the surface thereof.

[0017] Further, the punch press comprises a fixing frame, a workbench is arranged on the fixing frame, first and second material conveying rollers are arranged at two ends of the workbench, a control box is arranged on the fixing frame close to the first material conveying roller, a stepping structure for step-by-step rotating the first and second material conveying rollers is arranged in the control box, a die plate is arranged on the top of the workbench, a mounting hole is arranged at the lower end of the die plate, the movable die is fixedly connected with the mounting hole through screw threads, a control structure for controlling the die plate to approach or move away from the workbench is arranged between the top of the fixing frame and the die plate, a mounting groove is further arranged on the workbench, a plurality of screw holes are arranged in the mounting groove, the fixed die is arranged in the mounting groove and is fixedly connected with the mounting groove through the screw holes, and a discharging hole is arranged at the bottom of the mounting groove.

[0018] Further, the stepping structure comprises a driving motor, the driving motor is fixedly connected with the control box, a first stepping piece and a second stepping piece are arranged in the control box, the second stepping piece is fixedly connected with the output shaft of the driving motor, the first stepping piece is fixedly connected with the first material conveying roller, a plurality of limiting holes are arranged on the first stepping piece, each of the limiting holes is directed to the center of the first stepping piece, a sliding cylinder is fixedly arranged on the second stepping piece, and the sliding cylinder is slidingly connected with each of the limiting holes.

[0019] Further, the second stepping piece has a circular cross section, a rotating notch is arranged on the second stepping piece, the rotating notch has a fan-shaped structure, the sliding cylinder is arranged in the rotating notch, a connecting rod is connected between the sliding cylinder and the second stepping piece, a synchronous belt is arranged between the first and second material conveying rollers, a limiting arc surface is arranged between each of the limiting holes, and the second stepping piece is in abutment with the limiting arc surface.

[0020] Further, a first sliding groove is arranged on the connecting rod, the first sliding groove has a "convex" cross section, a sliding piece is slidingly connected in the first sliding groove, the sliding cylinder is rotatably connected with the sliding piece, a limiting groove is arranged on the sliding piece, a first rotating hole is arranged on the inner wall of the limiting groove, an adjusting bolt is rotatably connected in the first rotating hole, the adjusting bolt is threadedly connected with the connecting rod, and a limiting bolt is arranged in the limiting groove and is fixedly connected with the adjusting bolt.

[0021] Further, the control structure comprises a telescopic piece, the fixed end of the telescopic piece is fixedly connected with the top of the fixing frame, a first sliding hole is arranged on the top of the fixing frame, the telescopic end of the telescopic piece is slidingly connected with the first sliding hole, and the telescopic end of the telescopic piece is fixedly connected with the die plate.

[0022] The working principle and beneficial effects of the present application are as follows:

[0023] The working process of the embodiment is as follows: the materials to be processed are respectively fed below the first material conveying roller and the second material conveying roller, then the adjusting bolt is rotated to make the distance between the punched holes reach a proper distance according to the requirement, and then the driving motor and the telescopic piece are started, when the telescopic piece punches the movable die into the die casting hole of the fixed die, the first abutting piece and the second abutting piece in the die casting hole are extruded by the movable die to move to two sides, driving the first connecting piece and the second connecting piece to rotate, so that the first die casting plate and the second die casting plate seal the lower end of the die casting hole, at this time, the materials are die cast into shape under the action of the movable die, the first die casting plate and the second die casting plate; when the telescopic piece takes the movable die away from the die casting hole, under the action of the limiting spring, the first abutting piece and the second abutting piece move towards each other, driving the first connecting piece and the second connecting piece to reverse rotation, at this time, the first die casting plate and the second die casting plate open the die casting hole, and the pressed end cover flows out from the discharge hole.

[0024] The first die casting plate and the second die casting plate are arranged in the fixed die, the first die casting plate and the second die casting plate are controlled to seal or open the lower end of the die casting hole through the connecting structure, so that the first die casting plate and the second die casting plate not only punch the processing materials into shape in the sealing state, but also can automatically open the first die casting plate and the second die casting plate after the punching is completed, and the materials punched in the die casting hole are guided out through the discharge hole, the present application replaces the prior art of producing the negative end cover of the battery by using partial punching and manual picking, reduces the process of manually picking the negative end cover, improves the production efficiency and the quality of the product, and has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0026] Figure 1 It is a structural schematic diagram of the prior art;

[0027] Figure 2 It is a structural schematic diagram of the fixed die in the first embodiment;

[0028] Figure 3 It is a structural schematic diagram of the whole structure of the second embodiment;

[0029] Figure 4 It is a structural schematic diagram of the control box in the second embodiment Figure 1 ;

[0030] Figure 5 It is a structural schematic diagram of the control box in the second embodiment Figure 2 ;

[0031] Figure 6 It is a structural schematic diagram of the connecting rod in the second embodiment;

[0032] Figure 7Fig. 2 is a schematic view of the connecting structure of the mold plate in Example 2;

[0033] Figure 8 Fig. 3 is a schematic view of the overall structure in Example 2.

[0034] Fig. 1 is a schematic view of the connecting structure of the mold plate in Example 2.

[0035] 1, fixed frame; 11, discharge hole; 12, mounting groove; 121, threaded hole; 13, first sliding hole; 14, workbench; 2, control box; 21, driving motor; 31, first material conveying roller; 32, second material conveying roller; 311, synchronous belt; 4, telescopic member; 5, mold plate; 51, movable mold; 52, mounting hole; 6, fixed mold; 61, die casting hole; 611, second sliding groove; 612, third sliding groove; 62, limiting plate; 71, first stepping member; 711, limiting hole; 712, limiting camber; 713, sliding cylinder; 714, connecting rod; 7141, first sliding groove; 715, sliding member; 7151, limiting groove; 7152, first rotating hole; 716, adjusting bolt; 7161, limiting bolt; 72, second stepping member; 721, rotating gap; 81, first die casting plate; 82, second die casting plate; 83, first connecting member; 831, second sliding hole; 84, second connecting member; 91, first abutting member; 911, second rotating hole; 912, first sliding rod; 92, second abutting member; 93, second sliding rod; 931, limiting spring; 932, limiting member. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor also fall within the scope of protection of the present application. EMBODIMENT

[0037] As Figure 2As shown, the battery negative end cover mold of the embodiment comprises a fixed mold 6 and a movable mold 51. A die casting hole 61 is arranged on the fixed mold 6 to facilitate the installation and dismounting of the movable mold 51 and the fixed mold 6. A first die casting plate 81 and a second die casting plate 82 are rotatably arranged at the bottom of the die casting hole 61. A connecting structure is arranged on the sidewall of the die casting hole 61 to seal the die casting hole 61 with the first die casting plate 81 and the second die casting plate 82 when the movable mold 51 is deep into the die casting hole 61 or to open the die casting hole 61 when the movable mold 51 is away from the die casting hole 61. The first die casting plate 81 and the second die casting plate 82 can be provided with protrusions required for the manufacture of the battery negative end cover. The protrusions are matched with the movable mold 51 to realize the press forming of the battery negative end cover. When the first die casting plate 81 and the second die casting plate 82 seal the lower end of the die casting hole 61, the movable mold 51 presses the to-be-stamped material against the first die casting plate 81 and the second die casting plate 82 to make the to-be-stamped material be press formed. When the first die casting plate 81 and the second die casting plate 82 are opened, the lower end of the die casting hole 61 is no longer sealed, and the end cover after stamping flows out of the discharge hole 11.

[0038] The connecting structure of the embodiment comprises a first abutting piece 91 and a second abutting piece 92. A second sliding groove 611 and a third sliding groove 612 are arranged on both sides of the die casting hole 61. The first abutting piece 91 is slidably connected with the second sliding groove 611, and the second abutting piece 92 is slidably connected with the third sliding groove 612 to prevent the first abutting piece 91 and the second abutting piece 92 from deviating when sliding, so that the first abutting piece 91 and the second abutting piece 92 move more stably and reliably. A first connecting piece 83 and a second connecting piece 84 are rotatably arranged on the fixed mold 6. One end of the first connecting piece 83 is slidably connected with the first abutting piece 91, and the other end of the first connecting piece 83 is rotatably connected with the first die casting plate 81. One end of the second connecting piece 84 is slidably connected with the second abutting piece 92, and the other end of the second connecting piece 84 is rotatably connected with the second die casting plate 82. When the movable mold 51 is deep into the die casting hole 61, the first abutting piece 91 and the second abutting piece 92 move away from each other under the extrusion of the movable mold 51, and the first connecting piece 83 and the second connecting piece 84 respectively rotate with the first die casting plate 81 and the second die casting plate 82 to seal the lower end of the die casting hole 61. In this way, the material can be press formed under the action of the first die casting plate 81, the second die casting plate 82 and the movable mold 51.

[0039] The first abutting piece 91 in the embodiment has a right-angled ladder-shaped cross section, which is used to push the first abutting piece 91 to move away from the second abutting piece 92 when the movable mold 51 moves downward. The second rotating hole 911 is arranged on the first abutting piece 91, which is used to facilitate the rotation of the first sliding rod 912. The first sliding rod 912 is fixedly arranged in the second rotating hole 911, the second sliding hole 831 is arranged on the first connecting piece 83, the first sliding rod 912 is in sliding connection with the second sliding hole 831, and the first connecting piece 83 and the second connecting piece 84 are the same in structure. Such a design can make the first abutting piece 91 rotate by driving the first connecting piece 83 to rotate, thereby controlling the first die-casting plate 81 to rotate.

[0040] The second sliding rod 93 in the embodiment is fixedly arranged at the end of the first abutting piece 91 away from the second abutting piece 92, the limiting plate 62 is arranged at the side of the second sliding groove 611 away from the die-casting hole 61, and the limiting plate 62 is in sliding connection with the second sliding rod 93. The limiting spring 931 is sleeved on the second sliding rod 93, and the limiting spring 931 has two ends fixedly connected with the first abutting piece 91 and the limiting plate 62 respectively. The limiting piece 932 is fixedly arranged at the end of the second sliding rod 93 away from the first abutting piece 91, which is used to prevent the first abutting piece 91 and the second abutting piece 92 from being too close under the action of the spring, so that the movable mold 51 is stuck and difficult to enter. The first abutting piece 91 and the second abutting piece 92 are the same in structure. Under the action of the limiting spring 931, the first abutting piece 91 and the second abutting piece 92 move towards each other, the first die-casting plate 81 and the second die-casting plate 82 open the lower end of the die-casting hole 61 under the action of the first connecting piece 83 and the second connecting piece 84, and at this time, the end cover formed by die casting can flow out of the discharge hole 11. Embodiment

[0041] As Figures 3-8 shown in the embodiment 1, a preparation method of a battery negative end cover is provided,

[0042] S1: select 30-40 microns of aluminum material, add it into the acetone solution, and remove the oil stains and dirt on the surface of the aluminum material. The acetone solution is used as a cleaning agent for cleaning the aluminum material, which can dissolve the dirt and oil stains on the surface of the aluminum material, so that the end cover is cleaner.

[0043] S2: the cleaned aluminum material is placed in a punch, and the punched end cover is obtained. A large number of end cover processing can be completed in a short time by the punch, and the automatic punching reduces the waste caused by human operation errors.

[0044] S3: the obtained end cover is polished, polished, and then a layer of copper is coated on the surface. The polishing and polishing can make the surface of the end cover smoother and finer, so that the copper coating is more smooth and flat, and the copper on the coating is to increase the conductivity of the end cover.

[0045] The control structure in the embodiment comprises a telescopic member 4, a fixed end of the telescopic member 4 is fixedly connected with the top of the fixed frame 1, a first sliding hole 13 is arranged at the top of the fixed frame 1, a telescopic end of the telescopic member 4 is slidably connected with the first sliding hole 13, and the telescopic end of the telescopic member 4 is fixedly connected with the press die plate 5. The telescopic member 4 adopted in the embodiment is preferably a hydraulic cylinder or an air cylinder. The hydraulic cylinder or the air cylinder is prior art, and the embodiment will not be described in detail. The hydraulic cylinder or the air cylinder is adopted in the embodiment to control the press die plate 5 to approach or move away from the workbench 14, so that when stamping is performed, the buffering force generated during stamping can be controlled by the hydraulic cylinder or the air cylinder, and the collision damage to the die is reduced.

[0046] The stamping machine in the embodiment comprises the fixed frame 1, the workbench 14 is arranged on the fixed frame 1, the first material conveying roller 31 and the second material conveying roller 32 are arranged at two ends of the workbench 14, and are used to provide conveying power for the material to be stamped, so that the material to be stamped can be automatically stamped. The control box 2 is arranged on the fixed frame 1 close to the first material conveying roller 31, the stepping structure is arranged in the control box 2, and is used to step the first material conveying roller 31 and the second material conveying roller 32 to rotate. The press die plate 5 is arranged at the top of the workbench 14, the mounting hole 52 is arranged at the lower end of the press die plate 5, and is used to be threadedly connected with the movable die 51, so as to facilitate dismounting and mounting of the movable die 51. The movable die 51 is fixedly connected with the mounting hole 52 through the thread. The control structure is arranged between the fixed frame 1 and the top of the press die plate 5, and is used to control the press die plate 5 to approach or move away from the workbench 14. The mounting groove 12 is arranged on the workbench 14, a plurality of threaded holes 121 are arranged in the mounting groove 12, and are used to facilitate mounting and dismounting of the fixed die 6, so as to facilitate replacement of the fixed die 6 to adapt to different specifications of the battery negative electrode end cover. The fixed die 6 is arranged in the mounting groove 12 and is fixedly connected with the mounting groove 12 through the threaded holes 121. The discharge hole 11 is arranged at the bottom of the mounting groove 12, and is used to guide the negative electrode end cover processed to be discharged.

[0047] The stepping structure in the embodiment comprises a driving motor 21 fixedly connected with the control box 2, a first stepping piece 71 and a second stepping piece 72 arranged in the control box 2, the second stepping piece 72 is fixedly connected with an output shaft of the driving motor 21, the first stepping piece 71 is fixedly connected with the first material conveying roller 31, a plurality of limiting holes 711 are arranged on the first stepping piece 71, each limiting hole 711 points to the center of the first stepping piece 71, a sliding cylinder 713 is fixedly arranged on the second stepping piece 72, and the sliding cylinder 713 is in sliding connection with each limiting hole 711. When the sliding cylinder 713 on the second stepping piece 72 is in the limiting hole 711, the sliding cylinder 713 can rotate with the first stepping piece 71, when the sliding cylinder 713 on the second stepping piece 72 is out of the limiting hole 711, the sliding cylinder 713 is not in contact with the first stepping piece 71 and no longer drives the first stepping piece 71 to rotate, thereby realizing that the material to be punched is transported by the first material conveying roller 31 and the second material conveying roller 32 for a distance, then paused for a period of time, and punching is performed in the period of time, thereby realizing automatic punching.

[0048] The second stepping piece 72 in the embodiment has a circular cross section, a rotating gap 721 is arranged on the second stepping piece 72, the rotating gap 721 has a fan-shaped structure, the sliding cylinder 713 is arranged in the rotating gap 721, and a connecting rod 714 is arranged between the sliding cylinder 713 and the second stepping piece 72. A synchronous belt 311 is arranged between the first material conveying roller 31 and the second material conveying roller 32, so that the rotating speeds of the first material conveying roller 31 and the second material conveying roller 32 are the same, and the material to be processed is transported more stably and reliably. A limiting arc surface 712 is arranged between each limiting hole 711, the second stepping piece 72 abuts against the limiting arc surface 712, and is used to ensure that, when the sliding cylinder 713 on the second stepping piece 72 is out of the limiting hole 711, the second stepping piece 72 rotates while abutting against the limiting arc surface 712, the first stepping piece 71 is limited from rotating, the sliding cylinder 713 can more accurately enter the next limiting hole 711, and the stepping structure more stably performs stepping movement.

[0049] In this embodiment, the first sliding groove 7141 is provided on the connecting rod 714. The cross-section of the first sliding groove 7141 is "convex" shaped, which is used to ensure that the sliding member 715 slides more smoothly in the first sliding groove 7141 and is less prone to sliding deviation. The sliding member 715 is slidably disposed in the first sliding groove 7141. The sliding cylinder 713 is rotatably connected to the sliding member 715. The limiting groove 7151 is disposed on the sliding member 715. The first rotating hole 7152 is disposed on the inner wall of the limiting groove 7151. The adjusting bolt 716 is rotatably disposed in the first rotating hole 7152. The adjusting bolt 716 is threadedly connected to the connecting rod 714. The limiting bolt 7161 is disposed in the limiting groove 7151. The limiting bolt 7161 is fixedly connected to the adjusting bolt 716. In this embodiment, the adjusting bolt 716 is used to control the position of the sliding member 715, so that when the adjusting bolt 716 is stopped from rotating, the sliding member 715 is locked and fixed on the connecting rod 714, making the stepping structure more robust and reliable. In this embodiment, after increasing or decreasing the number of limiting holes 711, the position of the sliding member 715 in the first sliding groove 7141 can be adjusted by rotating the adjusting bolt 716, so that the distance of the first step feed member 71 in a single movement is adjustable. In this embodiment, the stamping interval of the stamping part can be adjusted according to actual needs to ensure that the material can be fully utilized.

[0050] This embodiment employs fully automated processing and production. Compared to existing technologies, it significantly reduces reliance on workers and improves production efficiency. Furthermore, through standardized and automated production, it avoids product quality issues caused by variations in worker skill levels. Therefore, the products processed in this embodiment have higher precision. Because it reduces the number of manual handling steps, the manufacturing process is more robust.

[0051] The working process of this embodiment is as follows: First, the material to be processed passes under the first conveying roller 31 and the second conveying roller 32 respectively. Then, the adjusting bolt 716 is rotated to make the spacing of the punching holes reach a suitable distance according to the requirements. Then, the drive motor 21 and the telescopic component 4 are started. When the telescopic component 4 presses the moving mold 51 into the die-casting hole 61 in the fixed mold 6, the first abutting component 91 and the second abutting component 92 in the die-casting hole 61 are squeezed to both sides by the moving mold 51, which drives the first connecting component 83 and the second connecting component 84 to rotate, so that the first die-casting plate 81 and the second die-casting plate 82 seal the lower end of the die-casting hole 61. At this time, the material is die-cast under the action of the moving mold 51, the first die-casting plate 81 and the second die-casting plate 82. When the telescopic component 4 takes the moving mold 51 away from the die-casting hole 61, under the action of the limiting spring 931, the first abutting component 91 and the second abutting component 92 move closer to each other, which drives the first connecting component 83 and the second connecting component 84 to rotate in the opposite direction. At this time, the first die-casting plate 81 and the second die-casting plate 82 open the die-casting hole 61, and the pressed end cap flows out from the discharge hole 11.

[0052] The above merely preferred embodiments of the present application are not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A die for a battery negative electrode end cover, comprising a fixed die (6) and a movable die (51), characterized in that, the fixed die (6) is provided with a die casting hole (61), the bottom of the die casting hole (61) is rotatably provided with a first die casting plate (81) and a second die casting plate (82), the sidewall of the die casting hole (61) is provided with a connecting structure for sealingly closing the die casting hole (61) when the movable die (51) is deep into the die casting hole (61) or opening the die casting hole (61) when the movable die (51) is away from the die casting hole (61), the connecting structure comprises a first abutting piece (91) and a second abutting piece (92), the two sides of the die casting hole (61) are respectively provided with a second sliding groove (611) and a third sliding groove (612), the first abutting piece (91) is slidably connected with the second sliding groove (611), the second abutting piece (92) is slidably connected with the third sliding groove (612), the fixed die (6) is further rotatably connected with a first connecting piece (83) and a second connecting piece (84), one end of the first connecting piece (83) is slidably connected with the first abutting piece (91), the other end of the first connecting piece (83) is rotatably connected with the first die casting plate (81), one end of the second connecting piece (84) is slidably connected with the second abutting piece (92), the other end of the second connecting piece (84) is rotatably connected with the second die casting plate (82), and the side of the die casting hole (61) facing the ground is provided with a discharge hole (11); the first abutting piece (91) has a right-angled ladder structure in cross section, the first abutting piece (91) is provided with a second rotating hole (911), the second rotating hole (911) is fixedly provided with a first sliding rod (912), the first connecting piece (83) is provided with a second sliding hole (831), the first sliding rod (912) is slidably connected with the second sliding hole (831), and the first connecting piece (83) and the second connecting piece (84) are the same in structure; the first abutting piece (91) is fixedly provided with a second sliding rod (93) away from the second abutting piece (92), the side of the second sliding groove (611) away from the die casting hole (61) is provided with a limiting plate (62), the limiting plate (62) is provided with a second sliding rod (93) slidably connected therewith, the second sliding rod (93) is sleeved with a limiting spring (931), the two ends of the limiting spring (931) are fixedly connected with the first abutting piece (91) and the limiting plate (62) respectively, and the end of the second sliding rod (93) away from the first abutting piece (91) is fixedly provided with a limiting piece (932), and the first abutting piece (91) and the second abutting piece (92) are the same in structure. 2.A preparation method of a battery negative electrode end cover, the method using the battery negative electrode end cover according to claim 1, characterized in that, S1: selecting 30-40 microns of aluminum material, adding it into an acetone solution, and removing oil stains and dirt on the surface of the aluminum material; S2: according to the actual processing needs to select the appropriate dynamic die and fixed die, and respectively installed to the installation slot and installation hole on the punch press; S3: the aluminum material is placed on the punch press, and the driving motor is started to step the transportation of the aluminum material, when the aluminum material stops transportation, the telescopic part is started to stamp the aluminum material; S4: after stamping, the dynamic die is separated from the fixed die, under the action of the limiting spring, the first connecting part and the second connecting part respectively with the first die casting plate and the second die casting plate rotate to the bottom of the die casting hole to open, the stamped end cover is separated from the die casting hole and flows out from the discharge hole, the step-by-step transportation realizes adjustable spacing through the driving motor control first step-by-step part and second step-by-step part; S5: the obtained end cover is polished, polished, and then a layer of copper is coated on the surface.

3. The method of claim 2, wherein the method further comprises: The punch press comprises a fixed frame (1), a workbench (14) is arranged on the fixed frame (1), first and second material conveying rollers (31) and (32) are arranged at both ends of the workbench (14), a control box (2) is arranged on the fixed frame (1) close to the first material conveying roller (31), a step-by-step structure for step-by-step rotating the first and second material conveying rollers (31) and (32) is arranged in the control box (2), a die plate (5) is arranged on the top of the workbench (14), a mounting hole (52) is arranged at the lower end of the die plate (5), the dynamic die (51) is fixedly connected with the mounting hole (52) through threads, a control structure for controlling the die plate (5) to approach or move away from the workbench (14) is arranged between the top of the fixed frame (1) and the die plate (5), and a mounting slot (12) is further arranged on the workbench (14), a plurality of threaded holes (121) are arranged in the mounting slot (12), the fixed die (6) is arranged in the mounting slot (12) and fixedly connected with the mounting slot (12) through the threaded holes (121), and a discharge hole (11) is arranged at the bottom of the mounting slot (12).

4. The method of claim 3, wherein the method further comprises: The step-by-step structure comprises a driving motor (21), the driving motor (21) is fixedly connected with the control box (2), a first step-by-step part (71) and a second step-by-step part (72) are arranged in the control box (2), the output shaft of the driving motor (21) is fixedly connected with the second step-by-step part (72), the first step-by-step part (71) is fixedly connected with the first material conveying roller (31), a plurality of limiting holes (711) are arranged on the first step-by-step part (71), each limiting hole (711) points to the center of the first step-by-step part (71), and a sliding cylinder (713) is fixedly arranged on the second step-by-step part (72) and slidably connected with each limiting hole (711).

5. The method of claim 4, wherein the method further comprises: The cross section of the second stepper (72) is circular structure, the second stepper (72) is provided with rotating gap (721), the rotating gap (721) is fan structure, the sliding cylinder (713) is arranged in rotating gap (721), the sliding cylinder (713) is connected with second stepper (72) between connecting rod (714), the first material roller (31) and second material roller (32) are provided with synchronous belt (311), each the limiting hole (711) is provided with limiting arc surface (712) between, the second stepper (72) and limiting arc surface (712) abut.

6. The method of claim 5, wherein the method further comprises: The connecting rod (714) is provided with first sliding groove (7141), the cross section of first sliding groove (7141) is " convex ” type, the first sliding groove (7141) is slidably connected with sliding piece (715), the sliding cylinder (713) is rotatably connected with sliding piece (715), the sliding piece (715) is provided with limiting slot (7151), the inner wall of limiting slot (7151) is provided with first rotating hole (7152), the first rotating hole (7152) is rotatably connected with adjusting bolt (716), the adjusting bolt (716) is threadedly connected with connecting rod (714), the limiting slot (7151) is provided with limiting bolt (7161), the limiting bolt (7161) is fixedly connected with adjusting bolt (716).

7. The method of claim 3, wherein the method further comprises: The control structure includes telescopic piece (4), the fixed end of telescopic piece (4) is fixedly connected with the top of fixed frame (1), the top of fixed frame (1) is provided with first sliding hole (13), the telescopic end of telescopic piece (4) is slidably connected with first sliding hole (13), the telescopic end of telescopic piece (4) is fixedly connected with press plate (5).

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