How to assemble cylindrical battery pole terminals

Abstract

The present invention relates to the technical field of cylindrical batteries, and more particularly, to a method for assembling pole terminals for cylindrical batteries. Specifically, the method includes the following steps: (1) laser-welding a special-shaped screw to the center of a current collector plate to form a composite current collector plate; (2) laser-welding the current collector plate to a tab on a winding core; (3) placing an insulating sheet over the current collector plate; (4) placing a case over the insulating sheet and winding core with its opening facing downward, the special-shaped screw passing upward through the special-shaped hole and extending to the outside of the top of the case; (5) combining a nut and a nut gasket to form a composite nut; (6) screwing the composite nut onto the special-shaped screw; and (7) laser-welding the threaded joint between the nut and the special-shaped screw from above. This satisfies positioning needs during assembly and ensures good electrical connection. The processing significantly improves yield, significantly saves internal space in cylindrical batteries, and allows for flexible selection of nut materials when used as pack terminals, resulting in high production line compatibility.

Description

[Technical Field]

[0001] The present invention relates to the technical field of cylindrical batteries, and more particularly to a method for assembling pole terminals of cylindrical batteries. [Background technology]

[0002] Currently, the pole terminal structure of a cylindrical battery typically includes a pole body and a case, the pole body being an integrated structure typically made of copper, the inside and outside of the pole body being secured to the case by crimping pieces, and a gasket for sealing and insulation between the pole body and the case. This type of pole terminal structure has the following drawbacks in practical application:

[0003] First, when the crimping piece on the inside of the pole body is bent, it occupies a large amount of the internal space of the cylindrical battery, resulting in a low utilization rate of the internal space of the cylindrical battery. Second, the post body and the current collector plate must be welded together, which makes positioning difficult and tends to generate a lot of metal debris, which can adversely affect the internal electrical characteristics of the battery, resulting in unstable internal resistance. Thirdly, since the terminal post body and the case are integrated, they are made of a single material and cannot be replaced, which means that the flexibility of use for pack terminals is insufficient.

[0004] As described above, the above problems with the pole terminal structure of cylindrical batteries have become technical challenges that must be resolved in the industry. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to overcome the drawbacks of the prior art, the present invention provides a method for assembling a cylindrical battery pole terminal, which solves the following problems: the conventional pole terminal structure occupies a large amount of internal space in a cylindrical battery; the conventional pole body and current collector plate are difficult to position when welded together, which adversely affects the internal electrical characteristics of the battery; and the conventional pole body is made of a single material, which means that it is not flexible enough to be used as a pack terminal. [Means for solving the problem]

[0006] The technical solutions adopted by the present invention to solve the above technical problems are as follows: A method for assembling pole terminals of a cylindrical battery, specifically, Step 1: laser welding a special-shaped screw to the center of a current collecting plate, and fitting a special-shaped gasket around the special-shaped screw to form a composite current collecting plate; Step 2: Laser welding the current collector plate to the tab of the winding core with the deformed screw facing upwards; Step 3: placing an insulating sheet above the current collector plate; Step 4: placing the case over the insulating sheet and the winding core with the opening facing downward, the center of the top of the case being provided with a profiled hole that fits into the profiled gasket for easy positioning, and the profiled screw passing upward through the profiled hole and extending to the outside of the top of the case; Step 5: combining the nut and the nut gasket to form a composite nut; Step 6: Screw the composite nut onto the deformed thread, and then fit the nut onto the deformed thread and tighten it to clamp and secure the case; and step 7 of fixing the threaded joint between the nut and the deformed screw by laser welding from above.

[0007] The deformed screw includes a screw base, a deformed screw rod, and a screw rod, and the screw base and the current collecting plate are laser welded together.

[0008] The profiled gasket and the profiled threaded rod are integrated together.

[0009] The insulating sheet is used to prevent short circuits between the current collector plate and the case.

[0010] The irregularly shaped gasket fits into the irregularly shaped hole to position the case when it is attached.

[0011] The nut and the nut gasket are integrated together.

[0012] The nut gasket is used to fit with the profiled gasket to prevent short circuits between the nut, profiled screw, and case.

[0013] The material of the nut includes aluminum, copper, nickel, or nickel-plated copper.

[0014] The current collector plate and profile screw are made of copper.

[0015] The case is made of aluminum. [Effects of the Invention]

[0016] By adopting the above technical solutions, the present invention has the following advantages:

[0017] A composite current collector plate is provided, and a special-shaped screw is fixed at the center of the composite current collector plate. The special-shaped screw penetrates to the top of the case and is threaded onto a composite nut. The composite nut is then fitted onto the special-shaped screw and tightened to clamp and secure the case. This significantly reduces the cost of the structure and the investment in equipment, achieves a high degree of automation and reliability in assembly, enables mass production, meets the positioning needs during assembly, and ensures good electrical connections. The processing yield is significantly improved, the reliability of the seal and electrical connection is effectively ensured, and the internal space of cylindrical batteries is fully saved. When used as a pack terminal, the nut material can be flexibly selected, which has a wide range of applications, improves productivity, and improves production line compatibility. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional schematic diagram of a structure of the present invention. [Figure 2] 1 is a cross-sectional schematic diagram of the structure of a composite current collector plate of the present invention. [Figure 3] 1 is a top view schematic diagram of the structure of a composite current collector plate of the present invention. [Figure 4] 1 is a cross-sectional schematic diagram of the structure of the composite nut of the present invention. [Figure 5] 1 is a top view schematic diagram of the structure of the composite nut of the present invention. [Figure 6] 1 is a cross-sectional view of the structure of the case of the present invention. [Figure 7] FIG. 2 is a top view schematic diagram of the structure of the case of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] In order to illustrate the technical features of the technical solution of the present invention, the present invention will be described in detail below through specific embodiments and with reference to the accompanying drawings.

[0020] As shown in Figures 1 to 7, in the method for assembling a pole terminal for a cylindrical battery, the pole terminal structure for a cylindrical battery includes a composite current collector plate, which includes a current collector plate 1. A deformed screw 2 is fixed at the center of the current collector plate 1, and a deformed gasket 3 is fitted around the deformed screw 2. The current collector plate 1 is laser welded to a tab on a winding core 4. An insulating sheet 5 is placed on the current collector plate 1. A case 6 houses the insulating sheet 5, the composite current collector plate, and the winding core 4. A deformed hole 7 is provided in the center of the case 6 to engage with the deformed gasket 3. The deformed screw 2 passes upward through the deformed hole 7 and extends to the outside of the upper part of the case 6, where it is threaded into a composite nut. The composite nut includes a nut 8 and a nut gasket 9 provided between the nut 8 and the case 6. The nut 8 is fitted onto the deformed screw 2 and tightened to clamp and secure the case 6. The threaded joint between the nut 8 and the profile screw 2 is welded and fixed by a laser, which prevents the nut 8 from loosening and also welds the seam, ensuring the reliability of the electrical connection.

[0021] The deformed screw 2 includes a screw base 10, a deformed threaded rod 11, and a screw rod 12, and the screw base 10 and the current collecting plate 1 are laser welded together.

[0022] The deformed gasket 3 and the deformed threaded rod 11 are integrated together, and the deformed gasket 3 and the deformed threaded rod 11 may have various shapes, preferably a hexagonal shape.

[0023] The insulating sheet 5 is used to prevent a short circuit between the current collector plate 1 and the case 6 .

[0024] The profiled gasket 3 is fitted into the profiled hole 7 to position the case 6 when it is attached, thereby meeting the need for positioning when the case 6 and the profiled screw 2 are assembled.

[0025] The nut 8 and the nut gasket 9 are integrated together.

[0026] The nut gasket 9 is fitted with the profiled gasket 3 to prevent short circuits between the nut 8, profiled screw 2, and case 6.

[0027] The nut 8 may be made of aluminum, copper, nickel, nickel-plated copper, etc. In pack applications, the material of the nut 8 can be flexibly selected, and the range of application is wide.

[0028] The current collector plate 1 and the profile screw 2 are made of copper.

[0029] The case 6 is made of aluminum.

[0030] The operating principle is as follows. When assembling, the specific steps are as follows: Step 1: A deformed screw 2 is laser welded to the center of a current collecting plate 1, and a deformed gasket 3 is fitted around the outside of the deformed screw 2 to form a composite current collecting plate. Step 2: Laser weld the current collector plate 1 to the tab of the winding core 4 so that the profile screw 2 faces upward. Step 3: The insulating sheet 5 is placed above the current collector plate 1. Step 4: The case 6 is placed above the insulating sheet 5 and the winding core 4 with the opening facing downward, and a special hole 7 is provided in the center of the top of the case 6 to fit into the special gasket 3 for easy positioning, and the special screw 2 passes upward through the special hole 7 and extends to the outside of the top of the case 6. Step 5: The nut 8 and the nut gasket 9 are combined to form a composite nut. Step 6: The composite nut is screwed onto the profile screw 2, and the nut 8 is fitted onto the profile screw 2 and tightened to clamp and fix the case 6. Step 7: The threaded joint between the nut 8 and the profile screw 2 is fixed by laser welding from above, which prevents the nut 8 from loosening, welds the seam, and ensures the reliability of the electrical connection.

[0031] The above specific embodiments do not limit the protection scope of the present invention, and it is obvious to those skilled in the art that any alternative improvements or transformations made to the embodiments of the present invention also fall within the protection scope of the present invention.

[0032] The parts of the present invention that are not described in detail are well known to those skilled in the art. [Explanation of symbols]

[0033] 1 Current collector plate 2. Irregular shaped screws 3. Irregular shaped gasket 4-wound core 5. Insulation sheet 6 cases 7 Irregular hole 8 nuts 9 Nut gasket 10 Screw base 11 Irregular threaded rod 12 threaded rod

Claims

1. A method for assembling pole terminals for a cylindrical battery, comprising the steps of: in particular, Step 1: laser welding a special-shaped screw to the center of a current collecting plate, and fitting a special-shaped gasket around the special-shaped screw to form a composite current collecting plate; Step 2: laser welding the current collector plate to the tab of the winding core so that the profile screw faces upward; Step 3: placing an insulating sheet above the current collector plate; Step 4: placing the case over the insulating sheet and the winding core with the opening facing downward, the center of the top of the case being provided with a profiled hole that fits into the profiled gasket for easy positioning, and the profiled screw passing upward through the profiled hole and extending to the outside of the top of the case; Step 5: combining the nut and the nut gasket to form a composite nut; Step 6: screwing a composite nut onto the profiled thread, and then fitting and tightening the nut onto the profiled thread to clamp and fix the case; and step 7 of fixing the threaded joint between the nut and the deformed screw by laser welding from above.

2. 2. The method for assembling a pole terminal of a cylindrical battery according to claim 1, wherein the irregular screw comprises a screw base, an irregular threaded rod, and a screw rod, and the screw base and the current collecting plate are laser welded together.

3. 3. The method for assembling a cylindrical battery pole terminal according to claim 2, wherein the deformed gasket and the deformed threaded rod are integrated together.

4. 2. The method for assembling a cylindrical battery post terminal according to claim 1, wherein the insulating sheet is used to prevent a short circuit between the current collector plate and the case.

5. 2. The method for assembling a cylindrical battery post terminal according to claim 1, wherein the irregularly shaped gasket fits into the irregularly shaped hole to perform positioning when the case is attached.

6. 2. The method for assembling a cylindrical battery post terminal according to claim 1, wherein the nut and the nut gasket are integrated.

7. 2. The method for assembling a cylindrical battery pole terminal according to claim 1, wherein the nut gasket is fitted with a deformed gasket to prevent short circuits between the nut, the deformed screw, and the case.

8. 2. The method for assembling a cylindrical battery pole terminal according to claim 1, wherein the material of the nut includes aluminum, copper, nickel, or nickel-plated copper.

9. 2. The method for assembling a cylindrical battery pole terminal according to claim 1, wherein the current collector plate and the deformed screw are made of copper.

10. 2. The method for assembling a cylindrical battery pole terminal according to claim 1, wherein the case is made of aluminum.

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