Preparation method of battery negative electrode end cover and mold thereof

Abstract

The invention relates to the technical field of battery negative electrode end covers, in particular to a preparation method of a battery negative electrode end cover and a mold of the battery negative electrode end cover. The problems that an existing battery end cover is long in production period and low in product quality are solved. A battery cathode end cover die structurally comprises a fixed die and a movable die, a die-casting hole is formed in the fixed die, and a first die-casting plate and a second die-casting plate are rotationally arranged at the bottom of the die-casting hole. The side wall of the die-casting hole is provided with a connecting structure used for sealing and closing the die-casting hole through the first die-casting plate and the second die-casting plate when the movable die goes deep into the die-casting hole or opening the die-casting hole through the first die-casting plate and the second die-casting plate when the movable die goes away from the die-casting hole. Compared with the prior art, not only is the dependence on workers remarkably reduced, but also the product quality problem caused by the technical level difference of the workers is avoided through a standardized and automatic production mode. Products processed by the embodiment of the invention have higher processing precision and higher strength.

Description

Technical Field

[0001] The invention relates to the technical field of battery negative terminal covers, and in particular to a preparation method of a battery negative terminal cover and a mold thereof. Background Art

[0002] The negative terminal cap of the battery is an important part of the battery. It is located at the negative end of the battery and has the functions of electrical connection and sealing to protect the battery.

[0003] In the prior art, in the process of realizing the rapid production of negative terminal caps, a stamping machine is usually used to process the material to be processed. It uses step-by-step material transportation and partial stamping, so that the negative terminal cap is still partially connected to the raw material after stamping. Subsequently, these parts are removed from the stamping machine, and workers manually remove these negative terminal caps to complete the manufacturing process.

[0004] Although this can achieve rapid processing of the end cap, the following problems still exist: since workers need to add a process of manually removing the negative end cap, not only the production cycle of the end cap is extended and the production cost is increased, but also the workers manually removing the negative end cap may cause damage to the negative end cap itself, affecting product quality. Summary of the invention

[0005] The invention provides a battery negative terminal cover mold, which solves the problems of long production cycle and low product quality of existing battery terminal covers and improves the practicability of the equipment.

[0006] The technical solution of the present invention is as follows: A battery negative terminal cover mold, Its structure includes a fixed mold and a movable mold, the fixed mold is provided with a die-casting hole, the bottom of the die-casting hole is rotatably provided with a first die-casting plate and a second die-casting plate, the side wall of the die-casting hole is provided with a 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 mold penetrates into the die-casting hole, or for the first die-casting plate and the second die-casting plate to open the die-casting hole when the movable mold is away from the die-casting hole, the connecting structure includes a first abutment and a second abutment, the two sides of the die-casting hole are respectively provided with a second sliding groove and a third sliding groove, the first abutment is slidably connected to the second sliding groove, and the second abutment is slidably connected to the third sliding groove, and the fixed mold is also rotatably connected with a first connecting member and a second connecting member, one end of the first connecting member is slidably connected to the first abutment, and the other end of the first connecting member is rotatably connected to the first die-casting plate, one end of the second connecting member is slidably connected to the second abutment, and the other end of the second connecting member is rotatably connected to the second die-casting plate.

[0007] Furthermore, the cross-section of the first abutment member is a right-angled trapezoidal structure, the first abutment member is provided with a second rotating hole, a first sliding rod is fixed in the second rotating hole, the first connecting member is provided with a second sliding hole, the first sliding rod is slidingly connected to the second sliding hole, and the first connecting member and the second connecting member have the same structure.

[0008] Furthermore, a second sliding rod is fixed to the end of the first abutment away from the second abutment, a limiting plate is provided on the side of the second sliding groove away from the die-casting hole, a limiting plate is provided on the limiting plate which is slidably connected to the second sliding rod, a limiting spring is sleeved on the second sliding rod, two ends of the limiting spring are respectively fixedly connected to the first abutment and the limiting plate, a limiting member is fixed to the end of the second sliding rod away from the first abutment, and the first abutment and the second abutment have the same structure.

[0009] Another object of the present invention is to provide a method for preparing a negative terminal cover of a battery. S1: Select 30-40 micron aluminum and add it to acetone solution to remove oil stains and dirt on the surface of the aluminum; S2: Select appropriate movable die and fixed die according to actual processing needs, and install them on the mounting slot and mounting hole of the punching machine respectively; S3: placing the aluminum material on the stamping machine and starting the driving motor to transport the aluminum material step by step. When the aluminum material stops being transported, the telescopic part is started to stamp the aluminum material. S4: After the stamping is completed, the movable die is separated from the fixed die, and under the action of the limit spring, the first connecting member and the second connecting member respectively carry the first die-casting plate and the second die-casting plate to rotate to the bottom of the die-casting hole and open, and the stamped end cover is separated from the die-casting hole and flows out from the discharge hole; S5: Polishing and grinding the obtained end cap, and then coating a layer of copper on the surface thereof.

[0010] Furthermore, the punching machine includes a fixed frame, a workbench is provided on the fixed frame, a first material transport roller and a second material transport roller are provided at both ends of the workbench, a control box is provided on the fixed frame close to the first material transport roller, a stepping structure for making the first material transport roller and the second material transport roller rotate step by step is provided in the control box, a pressing plate is provided on the top of the workbench, a mounting hole is provided at the lower end of the pressing plate, the movable mold is fixed to the mounting hole by a threaded connection, a control structure for controlling the pressing plate to approach or move away from the workbench is provided between the fixed frame and the top of the pressing plate, a mounting groove is also provided on the workbench, a plurality of threaded holes are provided in the mounting groove, the fixed mold is arranged in the mounting groove and is connected and fixed to the mounting groove by threaded holes, and a discharge hole is provided at the bottom of the mounting groove.

[0011] Furthermore, the stepping structure includes a driving motor, which is fixedly connected to a control box. A first stepping member and a second stepping member are provided in the control box. The second stepping member is fixedly connected to an output shaft of the driving motor. The first stepping member is fixedly connected to a first transport roller. A plurality of limiting holes are provided on the first stepping member, each of which points to a center of the first stepping member. A sliding cylinder is fixed on the second stepping member, and the sliding cylinder is slidingly connected to each limiting hole.

[0012] Furthermore, the cross-section of the second stepping member is a circular structure, the second stepping member is provided with a rotating notch, the rotating notch is 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 member, a synchronous belt is provided between the first material transport roller and the second material transport roller, a limiting arc surface is provided between each of the limiting holes, and the second stepping member abuts against the limiting arc surface.

[0013] Furthermore, the connecting rod is provided with a first sliding groove, the cross-section of the first sliding groove is a "convex" shape, a sliding member is slidingly connected in the first sliding groove, the sliding cylinder is rotatably connected to the sliding member, a limiting groove is provided on the sliding member, a first rotating hole is provided 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 to the connecting rod, a limiting bolt is provided in the limiting groove, and the limiting bolt is fixedly connected to the adjusting bolt.

[0014] Furthermore, the control structure includes a telescopic member, the fixed end of the telescopic member is fixedly connected to the top of the fixed frame, the top of the fixed frame is provided with a first sliding hole, the telescopic end of the telescopic member is slidingly connected to the first sliding hole, and the telescopic end of the telescopic member is fixedly connected to the pressure plate.

[0015] The working principle and beneficial effects of the present invention are: The working process of this embodiment is as follows: first, the material to be processed is passed under the first material transport roller and the second material transport roller respectively, and then the adjusting bolt is rotated to make the spacing of the punching holes reach an appropriate distance according to the demand, and then the driving motor and the telescopic part are started. When the telescopic part punches the movable mold into the die-casting hole in the fixed mold, the first abutment and the second abutment in the die-casting hole are squeezed to both sides by the movable mold, driving the first connecting part and the second connecting part 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 material is die-cast under the action of the movable mold, the first die-casting plate and the second die-casting plate; when the telescopic part brings the movable mold away from the die-casting hole, under the action of the limit spring, the first abutment and the second abutment move closer to each other, driving the first connecting part and the second connecting part to rotate in the opposite direction. 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.

[0016] In this embodiment, the first die-casting plate and the second die-casting plate are rotatably arranged in the fixed mold, and the first die-casting plate and the second die-casting plate are controlled by the connecting structure to seal or open the lower end of the die-casting hole, so that the first die-casting plate and the second die-casting plate can not only stamp out the processing material in a sealed state, but also automatically open the first die-casting plate and the second die-casting plate after the stamping is completed, and the material stamped in the die-casting hole can be discharged through the discharge hole. The present invention replaces the existing technology of using partial stamping and manual picking to produce the negative terminal cover of the battery, reduces the process of manually picking the negative terminal cover, improves production efficiency and product quality, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a structural schematic diagram of the prior art; Figure 2 Schematic diagram of the internal structure of the fixed mold in Example 1; Figure 3 It is a schematic diagram of the overall structure of the second embodiment; Figure 4 The internal structure of the control box in the second embodiment is shown in FIG. Figure 1 ; Figure 5 The internal structure of the control box in the second embodiment is shown in FIG. Figure 2 ; Figure 6 is a schematic structural diagram of a connecting rod in Embodiment 2; Figure 7 It is a schematic diagram of the connection structure of the pressing plate in the second embodiment; Figure 8 It is a schematic diagram of the overall structure in the second embodiment.

[0019] In the figure: 1. Fixing frame; 11. Discharging hole; 12. Mounting slot; 121. Threaded hole; 13. First sliding hole; 14. Workbench; 2. Control box; 21. Driving motor; 31. First conveying roller; 32. Second conveying roller; 311. Synchronous belt; 4. Telescopic member; 5. Pressing plate; 51. Moving die; 52. Mounting hole; 6. Fixed die; 61. Die-casting hole; 611. Second sliding slot; 612. Third sliding slot; 62. Limiting plate; 71. First step of feeding; 711. Limiting hole; 712. Limiting arc surface; 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 notch; 81, first die-cast plate; 82, second die-cast 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

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0021] like Figure 2 As shown, this embodiment proposes a battery negative terminal cap mold, which includes a fixed mold 6 and a movable mold 51. The die-casting hole 61 is set on the fixed mold 6 to facilitate the installation and disassembly of the movable mold 51 and the fixed mold 6. The first die-casting plate 81 and the second die-casting plate 82 are rotatably set at the bottom of the die-casting hole 61, and the side wall of the die-casting hole 61 is provided with a connection structure for the first die-casting plate 81 and the second die-casting plate 82 to seal and close the die-casting hole 61 when the movable mold 51 penetrates into the die-casting hole 61, or the first die-casting plate 81 and the second die-casting plate 82 to open the die-casting hole 61 when the movable mold 51 is far away from the die-casting hole 61. In this embodiment, the first die-casting plate 81 and the second die-casting plate 82 can be provided with a protrusion required for the manufacture of the battery negative terminal cap, and the protrusion cooperates with the movable mold 51 to realize the press molding of the battery negative terminal cap. 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 downward to die-cast the material to be stamped with the first die-casting plate 81 and the second die-casting plate 82, so that the material to be stamped is die-cast. 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 stamped end cover flows out from the discharge hole 11.

[0022] The connection structure in this embodiment includes a first abutment 91 and a second abutment 92, and a second sliding groove 611 and a third sliding groove 612 are arranged on both sides of the die-casting hole 61. The first abutment 91 is slidably connected to the second sliding groove 611, and the second abutment 92 is slidably connected to the third sliding groove 612, which is used to prevent the first abutment 91 and the second abutment 92 from being offset when sliding, so that the movement of the first abutment 91 and the second abutment 92 is more stable and reliable. The first connecting member 83 and the second connecting member 84 are rotatably arranged on the fixed mold 6, one end of the first connecting member 83 is slidably connected to the first abutment 91, and the other end of the first connecting member 83 is rotatably connected to the first die-casting plate 81, and one end of the second connecting member 84 is slidably connected to the second abutment 92, and the other end of the second connecting member 84 is rotatably connected to the second die-casting plate 82. When the movable die 51 waits for the material to be punched to enter the die-casting hole 61, it is squeezed by the movable die 51, and the first abutment member 91 and the second abutment member 92 move away from each other, and the first connecting member 83 and the second connecting member 84 respectively rotate with the first die-casting plate 81 and the second die-casting plate 82, so that the lower end of the die-casting hole 61 is sealed. In this way, the material can be die-casted under the action of the first die-casting plate 81, the second die-casting plate 82 and the movable die 51.

[0023] The cross section of the first abutment 91 in this embodiment is a right-angled trapezoidal structure, which is used to push the first abutment 91 to move away from the second abutment 92 when the movable mold 51 moves downward. The second rotating hole 911 is provided on the first abutment 91 to facilitate the rotation of the first sliding rod 912. The first sliding rod 912 is fixedly provided in the second rotating hole 911, and the second sliding hole 831 is provided on the first connecting member 83. The first sliding rod 912 is slidingly connected with the second sliding hole 831, and the first connecting member 83 and the second connecting member 84 have the same structure. Such a design allows the first abutment 91 to drive the first connecting member 83 to rotate when it moves, thereby controlling and driving the first die-casting plate 81 to rotate.

[0024] In this embodiment, the second sliding rod 93 is fixedly arranged at the end of the first abutment 91 away from the second abutment 92, and the limiting plate 62 is arranged on the side of the second sliding groove 611 away from the die-casting hole 61. The limiting plate 62 is slidingly connected to the second sliding rod 93. The limiting spring 931 is sleeved on the second sliding rod 93, and the two ends of the limiting spring 931 are fixedly connected to the first abutment 91 and the limiting plate 62 respectively. The limiting member 932 is fixedly arranged at the end of the second sliding rod 93 away from the first abutment 91, and is used to prevent the first abutment 91 and the second abutment 92 from being too close to each other under the action of the spring, so that the movable mold 51 is stuck and difficult to enter. The first abutment 91 and the second abutment 92 have the same structure. In this embodiment, under the action of the limit spring 931, the first abutment member 91 and the second abutment member 92 move closer to each other. Through the action of the first connecting member 83 and the second connecting member 84, the first die-casting plate 81 and the second die-casting plate 82 open the lower end of the die-casting hole 61. At this time, the die-cast end cover can flow out from the discharge hole 11. Example 2

[0025] like Figures 3~8 As shown, the present invention, based on Example 1, proposes a method for preparing a negative terminal cover of a battery. S1: Select 30~40 micron aluminum and add it to acetone solution to remove oil stains and dirt on the surface of the aluminum. Using acetone solution as a cleaning agent for cleaning aluminum can dissolve the dirt and oil stains on the surface of the aluminum, making the end cap cleaner.

[0026] S2: Place the cleaned aluminum material into the punching machine to obtain the punched end cap. The punching machine can complete a large number of end caps in a short time, and through automated punching, reduce the generation of waste caused by human operation errors.

[0027] S3: The end cap is polished and ground, and then a layer of copper is coated on its surface. Polishing and grinding can make the surface of the end cap smoother and more delicate, and the copper coating is flatter and smoother. The purpose of the copper coating is to increase the conductivity of the end cap.

[0028] The control structure in this embodiment includes a telescopic member 4, a fixed end of the telescopic member 4 is fixedly connected to the top of the fixed frame 1, a first sliding hole 13 is arranged on the top of the fixed frame 1, the telescopic end of the telescopic member 4 is slidingly connected to the first sliding hole 13, and the telescopic end of the telescopic member 4 is fixedly connected to the die plate 5. The telescopic member 4 used in this embodiment is preferably a hydraulic cylinder or a pneumatic cylinder. Among them, the hydraulic cylinder or the cylinder are both prior art, and will not be described in detail in this embodiment. In this embodiment, a hydraulic cylinder or a cylinder is used to control the die plate 5 to move close to or away from the workbench 14, so that when stamping is performed, a buffering force can be generated by the hydraulic cylinder or the pneumatic cylinder during stamping, thereby reducing collision damage to the mold.

[0029] The punching machine in this embodiment includes a fixed frame 1, a workbench 14 is arranged on the fixed frame 1, and a first material transport roller 31 and a second material transport roller 32 are arranged at both ends of the workbench 14 to provide transportation power for the material to be punched, so that the material to be punched can be punched automatically. The control box 2 is arranged on the side of the fixed frame 1 close to the first material transport roller 31, and the stepping structure is arranged in the control box 2 to make the first material transport roller 31 and the second material transport roller 32 step and rotate. The pressing plate 5 is arranged on the top of the workbench 14, and the mounting hole 52 is arranged at the lower end of the pressing plate 5 to connect the movable mold 51 by threading, so as to facilitate the disassembly and installation of the movable mold 51. The movable mold 51 is fixed to the mounting hole 52 by threading. The control structure is arranged between the fixed frame 1 and the top of the pressing plate 5 to control the pressing plate 5 to approach or move away from the workbench 14. The mounting groove 12 is arranged on the workbench 14, and a plurality of threaded holes 121 are arranged in the mounting groove 12 to facilitate the installation and disassembly of the fixed mold 6, and to facilitate the replacement of the fixed mold 6 to adapt to the processing of battery negative terminal covers of different specifications. The fixed mold 6 is arranged in the mounting groove 12 and is connected and fixed to the mounting groove 12 through the threaded hole 121. The discharge hole 11 is arranged at the bottom of the mounting groove 12 and is used to discharge the processed negative terminal cap.

[0030] The stepping structure in this embodiment includes a driving motor 21, which is fixedly connected to the control box 2. A first stepping member 71 and a second stepping member 72 are arranged in the control box 2. The second stepping member 72 is fixedly connected to the output shaft of the driving motor 21. The first stepping member 71 is fixedly connected to the first transport roller 31. A plurality of limiting holes 711 are arranged on the first stepping member 71, and each limiting hole 711 points to the center of the first stepping member 71. A sliding cylinder 713 is fixedly arranged on the second stepping member 72, and the sliding cylinder 713 is slidingly connected to each limiting hole 711. When the sliding cylinder 713 on the second stepping member 72 is in the limiting hole 711, the sliding cylinder 713 can rotate with the first stepping member 71. When the sliding cylinder 713 on the second stepping member 72 is out of the limiting hole 711, the sliding cylinder 713 is no longer in contact with the first stepping member 71 and no longer drives the first stepping member 71 to rotate, thereby realizing that the material to be stamped is transported forward a certain distance driven by the first conveying roller 31 and the second conveying roller 32, and then pauses for a period of time, during which time the stamping is performed, thereby realizing automatic stamping.

[0031] In this embodiment, the cross section of the second stepping member 72 is a circular structure, a rotating notch 721 is provided on the second stepping member 72, the rotating notch 721 is a fan-shaped structure, a sliding cylinder 713 is provided in the rotating notch 721, and a connecting rod 714 is provided between the sliding cylinder 713 and the second stepping member 72. The synchronous belt 311 is provided between the first material transport roller 31 and the second material transport roller 32, so that the first material transport roller 31 and the second material transport roller 32 have the same rotation speed, so that the transportation of the material to be processed is more stable and reliable. The limiting arc surface 712 is arranged between each limiting hole 711, and the second stepping member 72 abuts against the limiting arc surface 712 to ensure that when the sliding cylinder 713 on the second stepping member 72 is separated from the limiting hole 711, due to the abutment between the limiting arc surface 712 and the second stepping member 72, when the second stepping member 72 rotates, the first stepping member 71 is limited and cannot rotate, so that the sliding cylinder 713 can enter the next limiting hole 711 more accurately, thereby realizing a more stable stepping movement of the stepping structure.

[0032] In this embodiment, the first sliding groove 7141 is arranged on the connecting rod 714 , and the cross section of the first sliding groove 7141 is a “convex” shape, which is used to ensure that the sliding member 715 slides more smoothly in the first sliding groove 7141 and is not prone to sliding and displacement. The sliding member 715 is slidingly arranged in the first sliding groove 7141, the sliding cylinder 713 is rotationally connected to the sliding member 715, the limiting groove 7151 is arranged on the sliding member 715, the first rotating hole 7152 is arranged on the inner wall of the limiting groove 7151, the adjusting bolt 716 is rotationally arranged in the first rotating hole 7152, the adjusting bolt 716 is threadedly connected to the connecting rod 714, the limiting bolt 7161 is arranged in the limiting groove 7151, and 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 stops rotating, the position of the sliding member 715 on the connecting rod 714 is locked and fixed, making the stepping structure more firm and reliable. In this embodiment, after increasing or decreasing the number of limit 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 a single movement of the first step feeder 71 can be adjusted. In this embodiment, the stamping interval of the stamping parts can be adjusted according to actual needs to ensure that the material can be fully utilized.

[0033] This embodiment adopts fully automated processing and production. Compared with the prior art, it not only significantly reduces the dependence on workers and improves production efficiency, but also avoids product quality problems caused by differences in workers' technical levels through standardized and automated production models. Therefore, the products processed by this embodiment have higher processing accuracy. This embodiment reduces the workers' picking process, and the product manufacturing strength is higher.

[0034] The working process of this embodiment is as follows: first, the material to be processed is passed under the first material transport roller 31 and the second material transport roller 32 respectively, and then the adjusting bolt 716 is rotated to make the spacing of the punching holes reach a suitable distance according to the requirements, and then the driving motor 21 and the telescopic member 4 are started. When the telescopic member 4 punches the movable mold 51 into the die-casting hole 61 in the fixed mold 6, the first abutment 91 and the second abutment 92 in the die-casting hole 61 are squeezed to both sides by the movable mold 51, driving the first connecting member 83 and the second connecting member 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-casted under the action of the movable mold 51, the first die-casting plate 81 and the second die-casting plate 82; when the telescopic member 4 brings the movable mold 51 away from the die-casting hole 61, under the action of the limit spring 931, the first abutment 91 and the second abutment 92 move closer to each other, driving the first connecting member 83 and the second connecting member 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 cover flows out from the discharge hole 11.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery negative terminal cover mold, comprising a fixed mold (6) and a movable mold (51), characterized in that: The fixed mold (6) is provided with a die-casting hole (61), and 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 provided on the side wall of the die-casting hole (61) for the first die-casting plate (81) and the second die-casting plate (82) to seal and close the die-casting hole (61) when the movable mold (51) penetrates into the die-casting hole (61), or for the first die-casting plate (81) and the second die-casting plate (82) to open the die-casting hole (61) when the movable mold (51) is away from the die-casting hole (61). The connecting structure includes a first abutment member (91) and a second abutment member (92). Second sliding grooves ( The first abutment (91) is slidably connected to the second sliding groove (611), and the second abutment (92) is slidably connected to the third sliding groove (612). The fixed mold (6) is also rotatably connected with a first connecting member (83) and a second connecting member (84), one end of the first connecting member (83) is slidably connected to the first abutment (91), and the other end of the first connecting member (83) is rotatably connected to the first die-casting plate (81), one end of the second connecting member (84) is slidably connected to the second abutment (92), and the other end of the second connecting member (84) is rotatably connected to the second die-casting plate (82).

2. A battery negative terminal cover mold according to claim 1, characterized in that: The cross section of the first abutment member (91) is a right-angled trapezoidal structure. The first abutment member (91) is provided with a second rotation hole (911), a first sliding rod (912) is fixed in the second rotation hole (911), the first connecting member (83) is provided with a second sliding hole (831), the first sliding rod (912) is slidably connected to the second sliding hole (831), and the first connecting member (83) and the second connecting member (84) have the same structure.

3. A battery negative terminal cover mold according to claim 2, characterized in that: A second sliding rod (93) is fixed to the end of the first abutment member (91) away from the second abutment member (92); a limiting plate (62) is provided on the side of the second sliding groove (611) away from the die-casting hole (61); the limiting plate (62) is provided with a sliding connection with the second sliding rod (93); a limiting spring (931) is sleeved on the second sliding rod (93); two ends of the limiting spring (931) are respectively fixedly connected to the first abutment member (91) and the limiting plate (62); a limiting member (932) is fixed to the end of the second sliding rod (93) away from the first abutment member (91); the first abutment member (91) and the second abutment member (92) have the same structure.

4. A method for preparing a negative terminal cap of a battery, the method using a negative terminal cap of a battery as claimed in any one of claims 1 to 3, characterized in that: S1: Select 30-40 micron aluminum and add it to acetone solution to remove oil stains and dirt on the surface of the aluminum; S2: Select appropriate movable die and fixed die according to actual processing needs, and install them on the mounting slot and mounting hole of the punching machine respectively; S3: placing the aluminum material on the stamping machine and starting the driving motor to transport the aluminum material step by step. When the aluminum material stops being transported, the telescopic part is started to stamp the aluminum material. S4: After the stamping is completed, the movable die is separated from the fixed die, and under the action of the limit spring, the first connecting member and the second connecting member respectively carry the first die-casting plate and the second die-casting plate to rotate to the bottom of the die-casting hole and open, and the stamped end cover is separated from the die-casting hole and flows out from the discharge hole; S5: Polishing and grinding the obtained end cap, and then coating a layer of copper on the surface thereof.

5. The method for preparing a negative terminal cover of a battery according to claim 4, characterized in that: The punching machine comprises a fixed frame (1), a workbench (14) is provided on the fixed frame (1), a first material transport roller (31) and a second material transport roller (32) are provided at both ends of the workbench (14), a control box (2) is provided on the fixed frame (1) near the first material transport roller (31), a stepping structure for causing the first material transport roller (31) and the second material transport roller (32) to rotate step by step is provided in the control box (2), a pressing plate (5) is provided on the top of the workbench (14), a mounting hole (52) is provided at the lower end of the pressing plate (5), and the movable die ( The fixing frame (51) is fixed to the mounting hole (52) by threaded connection, a control structure for controlling the pressing plate (5) to move closer to or farther from the workbench (14) is provided between the fixing frame (1) and the top of the pressing plate (5), the workbench (14) is also provided with a mounting groove (12), a plurality of threaded holes (121) are provided in the mounting groove (12), the fixed mold (6) is arranged in the mounting groove (12) and is connected and fixed to the mounting groove (12) by threaded holes (121), and a discharge hole (11) is provided at the bottom of the mounting groove (12).

6. A method for preparing a negative terminal cap of a battery according to claim 5, characterized in that: The stepping structure comprises a driving motor (21), the driving motor (21) being fixedly connected to a control box (2), a first stepping member (71) and a second stepping member (72) being arranged in the control box (2), the second stepping member (72) being fixedly connected to an output shaft of the driving motor (21), the first stepping member (71) being fixedly connected to a first material transporting roller (31), the first stepping member (71) being provided with a plurality of limiting holes (711), each of the limiting holes (711) pointing to the center of the first stepping member (71), and a sliding cylinder (713) being fixed to the second stepping member (72), the sliding cylinder (713) being slidingly connected to each limiting hole (711).

7. A method for preparing a negative terminal cap of a battery according to claim 6, characterized in that: The cross section of the second stepping member (72) is a circular structure. The second stepping member (72) is provided with a rotation notch (721), and the rotation notch (721) is a fan-shaped structure. The sliding cylinder (713) is arranged in the rotation notch (721). A connecting rod (714) is connected between the sliding cylinder (713) and the second stepping member (72). A synchronous belt (311) is provided between the first material transport roller (31) and the second material transport roller (32). A limiting arc surface (712) is provided between each of the limiting holes (711), and the second stepping member (72) abuts against the limiting arc surface (712).

8. The method for preparing a negative terminal cap of a battery according to claim 7, characterized in that: The connecting rod (714) is provided with a first sliding groove (7141), the cross section of the first sliding groove (7141) is in the shape of a "convex" character, a sliding member (715) is slidingly connected in the first sliding groove (7141), the sliding cylinder (713) is rotatably connected to the sliding member (715), a limiting groove (7151) is provided on the sliding member (715), a first rotating hole (7152) is provided on the inner wall of the limiting groove (7151), an adjusting bolt (716) is rotatably connected in the first rotating hole (7152), the adjusting bolt (716) is threadedly connected to the connecting rod (714), a limiting bolt (7161) is provided in the limiting groove (7151), and the limiting bolt (7161) is fixedly connected to the adjusting bolt (716).

9. The method for preparing a negative terminal cover of a battery according to claim 5, characterized in that: The control structure comprises a telescopic member (4), a fixed end of the telescopic member (4) being fixedly connected to the top of a fixed frame (1), a first sliding hole (13) being provided at the top of the fixed frame (1), the telescopic end of the telescopic member (4) being slidably connected to the first sliding hole (13), and the telescopic end of the telescopic member (4) being fixedly connected to a pressing plate (5).

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