Lithium battery positive and negative electrode connecting piece stamping die

Abstract

This utility model relates to the field of stamping die technology, specifically a stamping die for positive and negative electrode connecting pieces of lithium batteries. It includes an upper die, a lower die, and a strip material. A stamping plate is mounted on the lower surface of the upper die. A shaped blowpipe and a flexible pusher are installed inside the stamping plate. The shaped blowpipe has several blowholes on its surface. The stamping plate has pressure relief grooves communicating with the blowholes. A receiving box is mounted on the lower surface of the lower die. The receiving box is connected to a suction machine to extract stamping waste discharged from the lower die. The strip material is placed on the upper surface of the lower die. This utility model utilizes a flexible pusher in conjunction with a top plate to press the strip material onto the surface of the lower die, forming a flexible clamping mechanism. During the upward movement of the pre-cutting punch and the edge-trimming punch, the strip material can be pressed down, counteracting the pulling force exerted on the strip by the pre-cutting punch and the edge-trimming punch, preventing warping or displacement of the strip material as the cutters move upward, thus improving the dimensional accuracy of the connecting piece.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically a stamping die for positive and negative electrode connecting pieces of lithium batteries. Background Technology

[0002] The positive and negative electrode connecting pieces of lithium batteries are products formed by stamping strips. The stamping die uses several punches to process and shape the strips.

[0003] In related technologies, a search revealed a solution for connecting inserts and stamping dies (announcement number CN223193715U), which includes an upper die assembly and a lower die assembly. Several guide posts for guiding and positioning are provided between the upper die assembly and the lower die assembly. A conveying section for conveying a material belt is provided between the upper die assembly and the lower die assembly. The material belt is conveyed along the conveying section at preset intervals to form multiple connecting inserts on the material belt.

[0004] However, the above-mentioned stamping dies are commonly used types, and they have the following shortcomings when punching strips: after the strip is punched, it will be fitted onto the punch. When the punch is reset, it may cause the strip to move upward, resulting in strip misalignment, which is especially noticeable when the punch is worn and dull; under high-speed stamping, a local vacuum is formed between the punch and the scrap, causing the scrap to be adsorbed and move upward with the punch, resulting in chip jumping problems. Utility Model Content

[0005] The purpose of this invention is to provide a stamping die for the positive and negative electrode connecting pieces of a lithium battery, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A stamping die for positive and negative electrode connectors of a lithium battery includes an upper die, a lower die, and a strip material; A stamping plate is installed on the lower surface of the upper template. A special-shaped blow pipe and a flexible pusher are installed inside the stamping plate. The surface of the special-shaped blow pipe has several blow ports. The blow ports remove impurities from the surface of the material strip, preventing impurities from causing deformation or damage to the surface of the material strip and improving the quality of the connecting piece. The surface of the stamping plate is provided with a pressure relief groove that communicates with the blow ports. A receiving box is installed on the lower surface of the lower template. The receiving box is connected to a suction machine to extract the stamping waste discharged from the lower template, thereby realizing the automated collection of waste, reducing manual cleaning processes, improving production efficiency, and preventing waste accumulation from affecting subsequent stamping operations. The strip is placed on the upper surface of the lower template. The strip corresponds to the position of the irregular blow tube and the flexible pusher. The flexible pusher and the lower template clamp the strip to ensure the positioning accuracy of the strip during stamping, and to avoid the indentation or deformation caused by rigid clamping. This meets the requirements for stamping thin materials of positive and negative electrode connecting sheets of lithium batteries.

[0007] Furthermore, the surface of the stamping plate is provided with two mounting grooves, and the irregularly shaped blow pipe and the flexible pusher are respectively installed inside the two mounting grooves to prevent the irregularly shaped blow pipe and the flexible pusher from interfering with the stamping of the material strip. The side of the stamping plate is provided with an interface hole for the irregularly shaped blow pipe, which facilitates the connection between the air blowing equipment and the irregularly shaped blow pipe and makes installation convenient.

[0008] Furthermore, the flexible pusher has a hollow structure and a top plate on its surface. The top plate protrudes and ensures that the flexible pusher is in stable contact with the material strip, and the material strip clamping can be stable and long-lasting. The flexible pusher has a compression groove on its side, which can optimize the elastic deformation capability of the flexible pusher, improve the adaptability of flexible clamping, and ensure stable positioning of material strips of different thicknesses.

[0009] Furthermore, the receiving box is connected to a connector pipe on its side, which can be quickly connected to the suction machine. It is also easy to assemble and disassemble, which facilitates the maintenance of the negative pressure system and enables the automatic collection and discharge of waste. The left end of the receiving box is higher than the right end, which uses gravity to make the waste gather at the right end. Combined with the negative pressure suction, it improves the conveying efficiency of waste and avoids the accumulation and blockage of waste in the box.

[0010] Furthermore, the surface of the stamping plate is sequentially provided with a pre-cutting punch, a trimming punch, a first trimming knife, a second trimming knife, a face plate, and a cutting knife. The surface of the lower template is provided with punches, realizing integrated continuous stamping of the connecting piece from pre-punching, trimming, forming to cutting. The processes are implemented sequentially, which can ensure the stable forming of the connecting piece, ensuring production efficiency while ensuring the stable quality of the connecting piece.

[0011] Furthermore, the stamping plate surface is provided with a first lower folding blade and a second lower folding blade, and the lower template surface is provided with a bending opening. The bending angle of the first lower folding blade is smaller than that of the second lower folding blade, so as to realize the step-by-step bending and forming of the connecting piece. Compared with a single bending, step-by-step bending can effectively reduce the springback of the strip and ensure the accuracy and stability of the bending angle.

[0012] Furthermore, the surface of the stamping plate is provided with positioning rods corresponding to the holes of the strip, which can realize the precise positioning and step guidance of the strip, ensure the consistency of position for each stamping action, avoid the dimensional deviation of the stamped parts caused by strip offset, and improve the qualification rate of connecting pieces.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) The flexible pusher and the top plate are used to press the strip onto the surface of the lower template to form a flexible clamp. During the upward movement of the pre-cutting punch and the edge-cutting punch, the top plate applies a continuous and uniform downward pressure to the strip, which counteracts the pulling force on the strip when the pre-cutting punch and the edge-cutting punch move upward. This prevents the strip from warping or shifting as the tool moves upward, which is beneficial to improving the dimensional accuracy of the connecting piece.

[0014] (2) The waste generated by the strip punching enters the punch hole. The suction machine maintains the negative pressure state of the receiving box. The receiving box extracts the waste from the punch hole. Small metal chips can also be sucked away in time, solving the problem that small waste is easy to stick to the mold or strip surface under the traditional gravity feeding method, and there will be no chip jumping problem.

[0015] (3) The use of irregularly shaped blow tubes can clean the material strip, remove impurities from the material strip and the lower die, prevent impurities from being pressed into the surface of the connecting piece during the stamping process to form dents and scratches, prevent impurities from entering the gap between the tool and the lower die, avoid problems such as die jamming, tool breakage or increased wear, and extend the service life of the tool and the die.

[0016] (4) The material strip is bent by the distribution of the first and second lower folding blades to avoid defects such as wrinkles and cracks caused by excessive local stress on the material during a single bend, ensuring the surface flatness and structural integrity of the bending part of the connecting piece, while reducing the risk of material strip displacement during the bending process and improving the overall quality of the connecting piece. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the material strip structure of this utility model; Figure 3 This is a schematic diagram of the lower template of this utility model; Figure 4 This is a schematic diagram of the material receiving box of this utility model; Figure 5 This is a schematic diagram of the structure of the stamping plate of this utility model; Figure 6 This is a schematic diagram of the irregular-shaped purge tube of this utility model; Figure 7 This is a schematic diagram of the structure of the flexible pusher of this utility model.

[0018] In the diagram: 1. Upper template; 2. Stamping plate; 3. Lower template; 4. Material strip; 5. Receiving box; 6. Bending opening; 7. Punch; 8. Connecting pipe; 9. Flexible pusher; 10. Top plate; 11. Irregular shaped blow pipe; 12. Pre-cut punch; 13. Edge trimming punch; 14. First edge trimming knife; 15. Second edge trimming knife; 16. Face pressure plate; 17. First lower folding knife; 18. Second lower folding knife; 19. Cutting knife; 20. Mounting groove; 21. Pressure relief groove; 22. Positioning rod; 23. Compression groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Please see Figure 1-7 This utility model provides a technical solution: A stamping die for positive and negative electrode connectors of a lithium battery includes an upper die plate 1, a lower die plate 3, and a strip material 4.

[0021] A stamping plate 2 is installed on the lower surface of the upper template 1. A special-shaped blow pipe 11 and a flexible pusher 9 are installed inside the stamping plate 2. The flexible pusher 9 pushes the material strip 4 downward to prevent the material strip 4 from separating from the lower template 3 and the material strip 4 from curling up. The surface of the special-shaped blow pipe 11 has several blow ports to realize multi-point blowing of the material strip 4. It uses gas pressure to remove tiny impurities and ensures the cleanliness of the material strip 4 and the lower template 3. The surface of the stamping plate 2 is provided with a pressure relief groove 21 that communicates with the blow ports. Excess gas is discharged from the pressure relief groove 21 and will not affect the stamping of the material strip 4.

[0022] A receiving box 5 is installed on the lower surface of the lower template 3. The receiving box 5 is connected to a suction machine to extract the stamping waste discharged from the lower template 3. The receiving box 5 covers all the punch holes 7. When the receiving box 5 is in a negative pressure state, during the stamping process, the punch holes 7 can also be used to hold the material strip 4, realize the positioning of the material strip 4, and prevent the material strip 4 from moving up with the punch.

[0023] The strip 4 is placed on the upper surface of the lower template 3. The strip 4 corresponds to the position of the irregular blow pipe 11 and the flexible pusher 9. The flexible pusher 9 and the lower template 3 clamp the strip 4. The blowing and clamping are precisely matched with the strip 4 in space, so that the cleaning and clamping actions are carried out simultaneously with the subsequent stamping process. There is no need to add a separate positioning and cleaning station, which simplifies the mold structure, shortens the production cycle, and improves the overall stamping efficiency.

[0024] In this embodiment, as Figure 5 As shown, the surface of the stamping plate 2 is provided with two mounting grooves 20. The irregularly shaped purge pipe 11 and the flexible pusher 9 are respectively installed inside the two mounting grooves 20. The thickness of the irregularly shaped purge pipe 11 is less than the depth of the mounting groove 20, which is conducive to the gas being discharged from the mounting groove 20 and also avoids the irregularly shaped purge pipe 11 from contacting the material belt 4. This avoids leaving indentations on the material belt 4 and also prevents the irregularly shaped purge pipe 11 from being worn. The side of the stamping plate 2 is provided with interface holes corresponding to the position of the irregularly shaped purge pipe 11, so that the pipe fittings of the air blowing equipment can be quickly inserted into the irregularly shaped purge pipe 11.

[0025] In this embodiment, as Figure 5 and Figure 7 As shown, the flexible pusher 9 has a hollow structure. The surface of the flexible pusher 9 is provided with a top plate 10, and the side of the flexible pusher 9 is provided with a compression groove 23. The compression groove 23 and the hollow structure improve the toughness of the flexible pusher 9 and can avoid excessive compression of the material strip 4. The flexible pusher 9 can be compressed, which improves the adaptability of the flexible pusher 9 and ensures the stable positioning of material strips 4 of different thicknesses. The top plate 10 protrudes from the stamping plate 2 and contacts the material strip 4 before each punch. The top plate 10 can achieve the compression and positioning of the material strip 4 before stamping.

[0026] In this embodiment, as Figure 4 As shown, a connector pipe 8 is connected to the side of the receiving box 5. The height of the left end of the receiving box 5 is greater than that of the right end, so that the receiving box 5 is in an inclined state. With the help of the suction force, the waste material in the receiving box 5 can be quickly discharged. A solenoid valve can be installed between the connector pipe 8 and the suction machine. A high-frequency response two-position solenoid valve is selected. The two working positions of the solenoid valve correspond to the negative pressure on and the non-negative state, respectively. When the material belt 4 needs to move, the non-negative state will not affect the movement of the material belt 4. When it is being stamped, the negative pressure on state can extract the waste material in time.

[0027] In this embodiment, as Figure 5 As shown, the surface of the stamping plate 2 is sequentially provided with a pre-cutting punch 12, a trimming punch 13, a first trimming knife 14, a second trimming knife 15, a face plate 16, and a cutting knife 19, so as to realize the step-by-step stamping of the strip 4. The face plate 16 can flatten the strip 4, thereby ensuring the flatness of the connecting piece and preventing the problem of warping. The surface of the lower template 3 is provided with punches 7, which are precisely matched with the punches above to ensure the dimensional accuracy of the punches 7 and the trimming, improve the consistency of the connecting piece, and meet the high-precision assembly requirements of the positive and negative electrode connecting pieces of lithium batteries.

[0028] In this embodiment, as Figure 3 and Figure 5 As shown, the surface of the stamping plate 2 is provided with a first lower folding blade 17 and a second lower folding blade 18, and the surface of the lower template 3 is provided with a bending opening 6. The bending angle of the first lower folding blade 17 is smaller than that of the second lower folding blade 18. The bending angle of the first lower folding blade 17 is 45 degrees, and the bending angle of the second lower folding blade 18 is 90 degrees.

[0029] In this embodiment, as Figure 5 As shown, the surface of the stamping plate 2 is provided with positioning rods 22 corresponding to the holes of the strip 4. During the stamping process, the positioning rods 22 pass through the strip 4, which not only realizes the positioning of the strip 4, but also prevents the strip 4 from being pulled due to stamping. It also helps to maintain stamping accuracy.

[0030] Specifically, during use, the upper template 1 and the lower template 3 are installed on the stamping machine, the material strip 4 is placed on the lower template 3, and when the stamping plate 2 moves down, the air blowing device cleans the material strip 4 and the lower template 3 through the irregularly shaped blowing pipe 11. The top plate 10 of the flexible pusher 9 first contacts the material strip 4 and flexibly clamps the material strip 4 with the lower template 3. At the same time, the suction machine makes the receiving box 5 a negative pressure state. When the stamping plate 2 stamps the strip 4, the pre-cutting punch 12, the trimming punch 13, the first trimming knife 14, the second trimming knife 15, the face plate 16, the first lower folding knife 17, the second lower folding knife 18, and the cutting knife 19 sequentially complete the stamping and cutting processes; the first lower folding knife 17 and the second lower folding knife 18 cooperate with the bending opening 6 of the lower template 3 to realize the step-by-step bending of the two strips; The stamping waste is sucked into the receiving box 5 through the punch 7. The inclined structure accelerates the discharge of waste. The negative pressure is activated to discharge waste during stamping. The negative pressure state of the receiving box 5 is released when the material belt 4 moves. The material belt 4 moves and is continuously stamped, and finally the material belt 4 is stamped into a single lithium battery positive and negative electrode connecting piece.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stamping die for positive and negative electrode connecting pieces of a lithium battery, characterized in that, include: The upper template has a stamping plate installed on its lower surface. The stamping plate has an irregularly shaped blow pipe and a flexible pusher installed inside it. The surface of the irregularly shaped blow pipe has several blow ports. The surface of the stamping plate is provided with a pressure relief groove that communicates with the blow ports. The lower template has a receiving box installed on its lower surface, and the receiving box is connected to a suction machine to extract the stamping waste discharged from the lower template. The material strip is placed on the upper surface of the lower template, and the material strip corresponds to the position of the irregular blow pipe and the flexible pusher. The flexible pusher and the lower template clamp the material strip.

2. The stamping die for positive and negative electrode connecting pieces of a lithium battery according to claim 1, characterized in that: The stamping plate has two mounting slots on its surface. The irregularly shaped purge pipe and the flexible pusher are respectively installed inside the two mounting slots. The side of the stamping plate has an interface hole for the irregularly shaped purge pipe.

3. The stamping die for positive and negative electrode connecting pieces of a lithium battery according to claim 1, characterized in that: The flexible pusher has a hollow structure, with a top plate on its surface and a compression groove on its side.

4. The stamping die for positive and negative electrode connecting pieces of a lithium battery according to claim 1, characterized in that: The receiving box is connected to a connector pipe on its side, and the height of the left end of the receiving box is greater than the height of the right end.

5. A stamping die for positive and negative electrode connectors of a lithium battery according to claim 1, characterized in that: The surface of the stamping plate is sequentially provided with a pre-cutting punch, a trimming punch, a first trimming knife, a second trimming knife, a face plate, and a cutting knife, and the surface of the lower template is provided with punches.

6. The stamping die for positive and negative electrode connecting pieces of a lithium battery according to claim 1, characterized in that: The stamping plate surface is provided with a first lower folding blade and a second lower folding blade, and the lower template surface is provided with a bending opening. The bending angle of the first lower folding blade is smaller than that of the second lower folding blade.

7. A stamping die for positive and negative electrode connectors of a lithium battery according to claim 1, characterized in that: The surface of the stamping plate is provided with positioning rods corresponding to the holes in the strip.

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