Battery tab punching die

Abstract

The utility model relates to a battery tab punching die which comprises an upper cutter die, a lower cutter die, a lower cutter die and a lower cutter die, first punching cutting edges are symmetrically arranged at the two ends of the upper cutter die, and a first round corner and a second round corner are arranged at the two ends of each first punching cutting edge; the lower cutter die is provided with a die cutting groove matched with the upper cutter die, second punching cutting edges are symmetrically arranged at the two ends of the die cutting groove, and a third round corner and a fourth round corner are arranged at the two ends of each second punching cutting edge. The upper cutter die and the lower cutter die which are matched with each other to punch the pole piece to form the pole lug are arranged, and the first punching cutting edge of the upper cutter die and the second punching cutting edge of the lower cutter die are matched with each other to be used for punching to form the pole lug. The first round corner and the third round corner are matched with each other for punching two sides of the top of the tab to form top round corners, and the second round corner and the fourth round corner are matched with each other for punching two sides of the root of the tab to form root round corners, so that the periphery of the tab is smoother, and the phenomenon of damage or folding is avoided.

Description

Technical Field

[0001] This application relates to the technical field of battery tab processing and forming, and particularly relates to a battery tab punching die. Background Art

[0002] The tabs of existing batteries are generally rectangular or trapezoidal, and the two sides of the tab edge are sharp corner structures equal to or close to 90°. During the die-cutting, winding (or laminating) and assembling processes, they are prone to collide with equipment components and break or fold. When the damaged area is too large or the number of damaged or folded layers is too many, it will affect the current-carrying capacity of the battery tab, and thus affect the performance and quality of the battery product. For folded tabs, generally, additional manpower is required to manually process them, reducing the yield and efficiency of battery production.

[0003] Currently, during the process of pole piece processing, a die-cutting machine is often used for die-cutting. In the prior art, a metal knife die is used to punch the pole piece to form the shape of the tab. The root of the tab is rounded and the top is a straight edge. During the die-cutting roller passing and winding processes, it may cause defects such as the tab being folded, wrinkled, or flipped, with a certain quality risk. To reduce the defects of the tab during the pole winding process and the tab flipping during the cell winding process, it is necessary to improve the die for punching the tab. Summary of the Invention

[0004] An embodiment of this application provides a battery tab punching die to solve the problem that in the related art, when the battery tab punching die punches the pole piece to form the shape of the tab, the root of the tab is rounded and the top is a straight edge, which may cause the tab to be folded or wrinkled during the die-cutting roller passing and winding processes.

[0005] An embodiment of this application provides a battery tab punching die, including:

[0006] An upper cutting die, with symmetrically arranged first punching edges at both ends of the upper cutting die, and a first rounded corner and a second rounded corner at both ends of each of the first punching edges;

[0007] A lower cutting die, with a die-cutting groove adapted to the upper cutting die opened in the lower cutting die, and second punching edges symmetrically arranged at both ends of the die-cutting groove, and a third rounded corner and a fourth rounded corner at both ends of each of the second punching edges.

[0008] In some embodiments: The first punching edge and the first rounded corner and the second rounded corner at both ends of the first punching edge together form a "∫"-shaped punching edge;

[0009] The second punching edge and the third rounded corner and the fourth rounded corner at both ends of the second punching edge together form a "∫"-shaped punching edge.

[0010] In some embodiments, a third punching edge is provided on one side of the upper cutting die, and both ends of the third punching edge are connected to the first rounded corner;

[0011] A fourth punching edge is provided on one side of the die-cutting groove, and both ends of the fourth punching edge are connected to the third rounded corner;

[0012] The third punching edge is adapted to the fourth punching edge.

[0013] In some embodiments, the included angle between the first punching edge and the third punching edge is 90 - 100 degrees, and the included angle between the second punching edge and the fourth punching edge is 90 - 100 degrees.

[0014] In some embodiments, the die-cutting groove is located on the upper surface of the lower cutting die or penetrates through the upper and lower surfaces of the lower cutting die;

[0015] The other side of the die-cutting groove is a notch communicating with the side wall of the lower cutting die, and the fourth rounded corners are located on both sides of the notch.

[0016] In some embodiments, the upper cutting die includes a die-cutting section located inside the die-cutting groove and a connecting section located outside the notch. The connecting section is connected to the die-cutting section, the length of the connecting section is greater than the length of the die-cutting section and symmetrically extends from both ends of the die-cutting section;

[0017] The first punching edge and the first rounded corner are both located at both ends of the die-cutting section. The first rounded corner is located on the side away from the connecting section, and the second rounded corner is located at the connection between the connecting section and the die-cutting section.

[0018] In some embodiments, the first rounded corner and the third rounded corner have the same radius and are 3 mm to 9 mm, and the second rounded corner and the fourth rounded corner have the same radius and are 3 mm to 9 mm.

[0019] In some embodiments, both the upper cutting die and the lower cutting die are long strip flat plate structures with a set thickness, and the upper cutting die and the lower cutting die are made of tungsten steel material.

[0020] In some embodiments, the distance between the end of the die-cutting groove and the end of the lower cutting die is 30 mm to 45 mm.

[0021] In some embodiments, it further includes an upper die base connecting the upper cutting die and a lower die base connecting the lower cutting die. A driving mechanism for controlling the movement of the upper cutting die in a direction approaching or away from the lower cutting die is connected to the upper die base.

[0022] The beneficial effects brought by the technical solution provided in this application include:

[0023] An embodiment of the present application provides a battery tab punching die. Since the battery tab punching die of the present application is provided with an upper cutting die, symmetrically arranged first punching edges are provided at both ends of the upper cutting die, and a first rounded corner and a second rounded corner are provided at both ends of each first punching edge; a lower cutting die, the lower cutting die is provided with a die-cutting groove adapted to the upper cutting die, and symmetrically arranged second punching edges are provided at both ends of the die-cutting groove, and a third rounded corner and a fourth rounded corner are provided at both ends of each second punching edge.

[0024] Therefore, the battery tab punching die of the present application is provided with an upper cutting die and a lower cutting die that cooperate with each other to punch a pole piece to form a tab. Among them, the first punching edge of the upper cutting die and the second punching edge of the lower cutting die cooperate with each other to punch and form a tab. The first rounded corner and the third rounded corner cooperate with each other to punch and form a top rounded corner on both sides of the top of the tab, and the second rounded corner and the fourth rounded corner cooperate with each other to punch and form a root rounded corner on both sides of the root of the tab. The upper cutting die and the lower cutting die cooperate with each other to punch and form a tab, and rounded corners are formed at one time at the top and root of the tab, making the periphery of the tab smoother and preventing breakage or folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the cooperation between the upper cutting die and the lower cutting die of the embodiment of the present application;

[0027] Figure 2 It is a partial structural schematic diagram of the lower cutting die of the embodiment of the present application;

[0028] Figure 3 It is a partial structural schematic diagram of the upper cutting die of the embodiment of the present application;

[0029] Figure 4 It is a schematic structural diagram of the punched pole piece and tab of the embodiment of the present application.

[0030] Reference numerals:

[0031] 1, pole piece; 2, tab; 3, root rounded corner; 4, top rounded corner;

[0032] 10. Upper cutting die; 11. First punching edge; 12. First fillet; 13. Second fillet; 14. Third punching edge; 15. Die cutting section; 16. Connecting section;

[0033] 20. Lower cutting die; 21. Die cutting groove; 22. Second punching edge; 23. Third fillet; 24. Fourth fillet; 25. Fourth punching edge. Specific embodiments

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0035] The embodiments of this application provide a battery tab punching die, which can solve the problem that in the related art, when the battery tab punching die punches a tab shape on a pole piece, the root of the tab is a fillet and the top is a straight edge, which may cause the tab to be folded or wrinkled during die cutting over-rolling and winding processes.

[0036] See Figures 1 to 4 As shown, the embodiments of this application provide a battery tab punching die, including:

[0037] An upper cutting die 10, with symmetrically arranged first punching edges 11 at both ends of the upper cutting die 10, and first fillets 12 and second fillets 13 at both ends of each first punching edge 11; the first punching edge 11 is used to punch and form a tab 2 on the pole piece 1, the first fillet 12 is used to punch out the root fillet 3 of the tab 2, and the second fillet 13 is used to punch out the top fillet 4 of the tab 2.

[0038] A lower cutting die 20, which is provided with a die cutting groove 21 adapted to the upper cutting die 10, and symmetrically arranged second punching edges 22 at both ends of the die cutting groove 21, and third fillets 23 and fourth fillets 24 at both ends of each second punching edge 22. The second punching edge 22 is used to punch and form a tab 2 on the pole piece 1, the third fillet 23 is used to punch out the root fillet 3 of the tab 2, and the fourth fillet 24 is used to punch out the top fillet 4 of the tab 2.

[0039] The battery tab punching die of the embodiments of this application is provided with an upper cutting die 10 and a lower cutting die 20 that cooperate with each other to punch and form a tab 2 on the pole piece 1, wherein the first punching edge 11 of the upper cutting die 10 and the second punching edge 22 of the lower cutting die 20 cooperate with each other to punch and form the tab 2.

[0040] The first rounded corner 12 and the third rounded corner 23 cooperate with each other to punch and form a top rounded corner 4 on both sides of the top of the tab 2, and the second rounded corner 13 and the fourth rounded corner 24 cooperate with each other to punch and form a root rounded corner 3 on both sides of the root of the tab 2.

[0041] The upper cutting die 10 and the lower cutting die 20 cooperate with each other to punch and form the tab 2 on the electrode sheet 1, and rounded corners are punched and formed at the top and the root of the tab 2 at one time, making the periphery of the tab 2 smoother and preventing the tab 2 from being damaged or folded.

[0042] In some alternative embodiments: Refer to Figures 1 to 3 As shown, the embodiment of the present application provides a battery tab punching die. The first cutting edge 11 of the battery tab punching die and the first rounded corner 12 and the second rounded corner 13 at both ends of the first cutting edge 11 together form a "∫"-shaped cutting edge. The second cutting edge 22 of the battery tab punching die and the third rounded corner 23 and the fourth rounded corner 24 at both ends of the second cutting edge 22 together form a "∫"-shaped cutting edge.

[0043] The first cutting edge 11 of the embodiment of the present application, the first rounded corner 12 and the second rounded corner 13 at both ends of the first cutting edge 11, and the second cutting edge 22 of the battery tab punching die and the third rounded corner 23 and the fourth rounded corner 24 at both ends of the second cutting edge 22 together form a "∫"-shaped cutting edge. When punching the electrode sheet 1 with the "∫"-shaped cutting edge, not only can rounded corners be punched and formed at the top and the root of the tab 2 at one time, but also the shape of the tab 2 is an isosceles trapezoid structure, improving the structural strength at the connection between the tab 2 and the electrode sheet 1.

[0044] In some alternative embodiments: Refer to Figures 1 to 4 As shown, the embodiment of the present application provides a battery tab punching die. A third cutting edge 14 is provided on one side of the upper cutting die 10 of the battery tab punching die, and the first rounded corner 12 is connected to both ends of the third cutting edge 14. A fourth cutting edge 25 is provided on one side of the die-cutting groove 21, and the third rounded corner 23 is connected to both ends of the fourth cutting edge 25. The third cutting edge 14 is adapted to the fourth cutting edge 25, and thus the excess current collector between two adjacent tabs 2 is cut off from the electrode sheet 1.

[0045] In some alternative embodiments: Refer to Figures 1 to 3 As shown, the embodiment of the present application provides a battery tab punching die. The included angle between the first cutting edge 11 and the third cutting edge 14 of the battery tab punching die is 90 - 100 degrees. Preferably, the included angle between the first cutting edge 11 and the third cutting edge 14 is 93 degrees. The included angle between the second cutting edge 22 and the fourth cutting edge 25 is 90 - 100 degrees. Preferably, the included angle between the second cutting edge 22 and the fourth cutting edge 25 is 93 degrees.

[0046] In some alternative embodiments: Refer to Figures 1 to 3 As shown, an embodiment of the present application provides a battery tab punching die. The die-cutting groove 21 of the battery tab punching die is located on the upper surface of the lower cutting die 20 or penetrates through the upper and lower surfaces of the lower cutting die 20. One side of the die-cutting groove 21 away from the fourth cutting edge 25 is a notch communicating with the side wall of the lower cutting die, and the fourth fillets 24 are located on both sides of the notch.

[0047] The upper cutting die 10 includes a die-cutting section 15 located inside the die-cutting groove 21 and a connecting section 16 located outside the notch. The connecting section 16 is connected to the die-cutting section 15. The length of the connecting section 16 is greater than the length of the die-cutting section 15 and symmetrically extends beyond both ends of the die-cutting section 15. The first cutting edge 11 and the first fillet 12 are both located at both ends of the die-cutting section 15. The first fillet 12 is located on the side away from the connecting section 16, and the second fillet 13 is located at the connection between the connecting section 16 and the die-cutting section 15.

[0048] In some alternative embodiments: Refer to Figures 1 to 3 As shown, an embodiment of the present application provides a battery tab punching die. The first fillet 12 and the third fillet 23 of the battery tab punching die have the same radius, which is 3 mm to 9 mm, preferably 9 mm. The second fillet 13 and the fourth fillet 24 have the same radius, which is 3 mm to 9 mm, preferably 9 mm.

[0049] Both the upper cutting die 10 and the lower cutting die 20 are long strip flat plate structures with a set thickness. The upper cutting die 10 and the lower cutting die 20 are made of tungsten steel material, which has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. In particular, its high hardness and wear resistance remain basically unchanged even at a temperature of 500 °C and still have a high hardness at 1000 °C.

[0050] The distance between the end of the die-cutting groove 21 and the end of the lower cutting die 20 is 30 mm to 45 mm. The distance between the end of the die-cutting groove 21 and the end of the lower cutting die 20 is half of the width of the tab 2. By setting the distance between the end of the die-cutting groove 21 and the end of the lower cutting die 20, the width of the tab 2 can be changed.

[0051] In some alternative embodiments: Refer to Figures 1 to 3 As shown, an embodiment of the present application provides a battery tab punching die. The battery tab punching die further includes an upper die base (not shown in the figure) connected to the upper cutting die 10 and a lower die base (not shown in the figure) connected to the lower cutting die 20. A driving mechanism (not shown in the figure) for controlling the movement of the upper cutting die 10 in a direction approaching or away from the lower cutting die 20 is connected to the upper die base.

[0052] When it is necessary to punch the electrode tab 1 to form the tab 2, the driving mechanism drives the upper cutting die 10 downward through the upper die base into the die-cutting groove 21 of the lower cutting die 20. The tab 2 is punched and formed on the electrode tab 1 by the cooperation of the upper cutting die 10 and the lower cutting die 20. A top fillet 4 is punched at the top of the tab 2, and a root fillet 3 is punched at the root of the tab 2.

[0053] Working principle

[0054] The embodiment of the present application provides a battery tab punching die. Since the battery tab punching die of the present application is provided with an upper cutting die 10, symmetrically arranged first cutting edges 11 are provided at both ends of the upper cutting die 10, and a first fillet 12 and a second fillet 13 are provided at both ends of each first cutting edge 11; a lower cutting die 20, and the lower cutting die 20 is provided with a die-cutting groove 21 adapted to the upper cutting die 10. Symmetrically arranged second cutting edges 22 are provided at both ends of the die-cutting groove 21, and a third fillet 23 and a fourth fillet 24 are provided at both ends of each second cutting edge 22.

[0055] Therefore, the battery tab punching die of the present application is provided with an upper cutting die 10 and a lower cutting die 20 that cooperate with each other to punch the electrode tab 1 to form the tab 2. The first cutting edge 11 of the upper cutting die 10 and the second cutting edge 22 of the lower cutting die 20 cooperate with each other to punch and form the tab 2. The first fillet 12 and the third fillet 23 cooperate with each other to punch and form the top fillet 4 on both sides of the top of the tab 2, and the second fillet 13 and the fourth fillet 24 cooperate with each other to punch and form the root fillet 3 on both sides of the root of the tab 2. The upper cutting die 10 and the lower cutting die 20 cooperate with each other to punch and form the tab 2, and fillets are punched at both the top and the root of the tab 2 at one time, making the periphery of the tab 2 smoother and preventing breakage or folding.

[0056] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present application. Unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0058] The above are only specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A battery tab punching die, characterized in that: include: An upper cutting die (10), wherein two ends of the upper cutting die (10) are provided with symmetrically arranged first punching edges (11), and two ends of each of the first punching edges (11) are provided with a first rounded corner (12) and a second rounded corner (13); A lower cutting die (20) is provided with a die-cutting groove (21) adapted to the upper cutting die (10), second punching edges (22) are symmetrically provided at both ends of the die-cutting groove (21), and third rounded corners (23) and fourth rounded corners (24) are provided at both ends of each of the second punching edges (22).

2. A battery tab punching die as claimed in claim 1, characterized in that: The first punching edge (11) and the first rounded corners (12) and the second rounded corners (13) at both ends of the first punching edge (11) together form a "∫"-shaped punching edge; The second punching edge (22) and the third rounded corners (23) and the fourth rounded corners (24) at both ends of the second punching edge (22) together form a "∫"-shaped punching edge.

3. A battery tab punching die as claimed in claim 1 or 2, characterized in that: A third punching edge (14) is provided on one side of the upper cutting die (10), and two ends of the third punching edge (14) are connected to the first fillet (12); A fourth punching edge (25) is provided on one side of the die-cutting groove (21), and two ends of the fourth punching edge (25) are connected to the third fillet (23); The third punching edge (14) is matched with the fourth punching edge (25).

4. A battery tab punching die as claimed in claim 3, characterized in that: The included angle between the first punching edge (11) and the third punching edge (14) is 90-100 degrees, and the included angle between the second punching edge (22) and the fourth punching edge (25) is 90-100 degrees.

5. A battery tab punching die as claimed in claim 1 or 2, characterized in that: The die-cutting groove (21) is located on the upper surface of the lower cutting die (20) or runs through the upper and lower surfaces of the lower cutting die (20); The other side of the die-cutting groove (21) is a notch connected to the side wall of the lower cutting die, and the fourth fillet (24) is located on both sides of the notch.

6. A battery tab punching die as claimed in claim 5, characterized in that: The upper cutting knife mold (10) comprises a die-cutting section (15) located inside the die-cutting groove (21), and a connecting section (16) located outside the groove, wherein the connecting section (16) is connected to the die-cutting section (15), the length of the connecting section (16) is greater than the length of the die-cutting section (15) and extends symmetrically from both ends of the die-cutting section (15); The first punching edge (11) and the first rounded corner (12) are both located at two ends of the die-cutting section (15); the first rounded corner (12) is located on a side away from the connecting section (16); and the second rounded corner (13) is located at the connection between the connecting section (16) and the die-cutting section (15).

7. A battery tab punching die as claimed in claim 1, characterized in that: The radius of the first rounded corner (12) and the third rounded corner (23) is the same and is between 3 mm and 9 mm, and the radius of the second rounded corner (13) and the fourth rounded corner (24) is the same and is between 3 mm and 9 mm.

8. A battery tab punching die as claimed in claim 1, characterized in that: The upper cutting knife mold (10) and the lower cutting knife mold (20) are both long strip flat plate structures with a set thickness, and the upper cutting knife mold (10) and the lower cutting knife mold (20) are made of tungsten steel material.

9. A battery tab punching die as claimed in claim 1, characterized in that: The distance between the end of the die-cutting groove (21) and the end of the lower cutting die (20) is 30 mm to 45 mm.

10. A battery tab punching die as claimed in claim 1, characterized in that: It also comprises an upper die base connected to the upper cutting die (10) and a lower die base connected to the lower cutting die (20); the upper die base is connected to a driving mechanism for controlling the upper cutting die (10) to move in a direction close to or away from the lower cutting die (20).

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