Post terminal end assembling method for cylindrical battery

Abstract

The present invention relates to the technical field of cylindrical batteries, and in particular to a post terminal end assembling method for a cylindrical battery. The specific steps are as follows: step 1, laser-welding a special-shaped screw at the central position of a current collector plate, so as to form a composite current collector plate; step 2, laser-welding the current collector plate to a tab of a jelly roll; step 3, snap-fastening an insulating piece above the current collector plate; step 4, snap-fastening a housing with an opening facing downward above the insulating piece and the jelly roll, wherein the special-shaped screw penetrates upwardly through a special-shaped hole and extends to the outside of the top of the housing; step 5, compositing a nut with a nut sealing gasket to form a composite nut; step 6, mounting the composite nut onto the special-shaped screw by means of rotation; and step 7, using laser to weld and fix the threaded engagement part of the nut and the special-shaped screw from above. Positioning requirements during an assembling process are met, and a good electrical connection can also be ensured, such that the pass rate of a machining process is significantly improved; in addition, the internal space of a cylindrical battery is fully saved on, the material of a nut can be flexibly selected for a pack application end, and the compatibility of a production line is high.

Description

A method for assembling a cylindrical battery terminal Technical field:

[0001] The present invention relates to the technical field of cylindrical batteries, and in particular to a method for assembling a pole end of a cylindrical battery. Background technology:

[0002] Currently, the terminal structure of cylindrical batteries generally consists of a terminal body and a shell. The terminal body is a monolithic structure, generally made of copper. The outer shell is fixed to the terminal body by rivets on both the inner and outer sides. A sealing gasket is installed between the terminal body and the shell for sealing and insulation. This type of terminal structure has the following main disadvantages in practical application:

[0003] First, the rivet on the inside of the terminal body is bent and occupies more space inside the cylindrical battery, resulting in poor utilization of the internal space of the cylindrical battery;

[0004] Secondly, the pole body and the collector plate need to be welded, which is not easy to position. In addition, a lot of metal debris is easily generated during welding, which can easily affect the internal electrical performance of the battery and cause unstable internal resistance of the battery.

[0005] Third, since the pole body and the shell are composited into one body, the material is single and cannot be replaced, which leads to poor flexibility in the use of the pack end.

[0006] In summary, the above-mentioned problems with the terminal structure of cylindrical batteries have become technical difficulties that urgently need to be solved in the industry.

[0007] Summary of the invention:

[0008] In order to make up for the shortcomings of the existing technology, the present invention provides a method for assembling the terminal of a cylindrical battery, which solves the problem that the previous terminal structure occupies more internal space of the cylindrical battery, solves the problem that the terminal body and the collecting plate are difficult to position during welding, which affects the internal electrical performance of the battery, and solves the problem that the previous terminal body is made of a single material and has poor flexibility in using the pack end.

[0009] The technical solution adopted by the present invention to solve the above technical problems is:

[0010] A method for assembling a cylindrical battery terminal, the specific steps are as follows:

[0011] Step 1: Laser weld a special-shaped screw at the center of the current collecting plate, and sleeve a special-shaped sealing gasket on the outside of the special-shaped screw to form a composite current collecting plate;

[0012] Step 2: Laser weld the collector plate to the tabs of the winding core, with the special-shaped screws facing upwards;

[0013] Step 3: Snap the insulation sheet onto the collecting plate;

[0014] Step 4: Snap the housing opening downward onto the insulating sheet and winding core. There is a special-shaped hole in the center of the top of the housing that matches the special-shaped sealing gasket for easy positioning. The special-shaped screw passes through the special-shaped hole upward and extends to the outside of the top of the housing;

[0015] Step 5: Compound the nut and the nut gasket to form a composite nut;

[0016] Step 6: Rotate the composite nut onto the special-shaped screw and tighten the nut and special-shaped screw to clamp the housing.

[0017] Step 7: Use laser welding to fix the thread joints of the nut and the special-shaped screw from above.

[0018] The special-shaped screw comprises a screw seat, a special-shaped screw rod and a threaded rod, and the screw seat and the collecting plate are laser welded.

[0019] The special-shaped sealing gasket and the special-shaped screw are combined into one body.

[0020] The insulating sheet is used to isolate the short circuit mode between the collecting disc and the housing.

[0021] The special-shaped sealing gasket cooperates with the special-shaped hole to position the installation of the housing.

[0022] The nut and the nut sealing gasket are composited into one body.

[0023] The nut sealing gasket and the special-shaped sealing gasket are used in conjunction with each other to isolate the short circuit mode between the nut and the special-shaped screw and the housing.

[0024] The material of the nut includes aluminum, copper, nickel or copper plated with nickel.

[0025] The collecting plate and the special-shaped screws are made of copper.

[0026] The housing is made of aluminum.

[0027] The present invention adopts the above solution and has the following advantages:

[0028] By setting a composite collecting plate, a special-shaped screw is fixed at the center of the composite collecting plate, and the special-shaped screw passes through the top of the shell and is threadedly connected to the composite nut. The shell is clamped and fixed by tightening the composite nut and the special-shaped screw. The cost of structural parts is greatly reduced, and the equipment investment cost is greatly reduced. High-speed automated high-reliability assembly can be achieved, and it can be applied in mass production and manufacturing processes. It not only meets the positioning requirements in the assembly process, but also ensures good electrical connection. The qualified rate of the processing process is significantly improved, and the reliability of sealing and electrical connection is effectively guaranteed. At the same time, it fully saves the internal space of the cylindrical battery, and the nut material can be flexibly selected for the pack application end. It has a wide range of applications, improved manufacturability, and strong production line compatibility. Description of the drawings:

[0029] FIG1 is a schematic cross-sectional view of the present invention.

[0030] FIG2 is a schematic cross-sectional view of the composite current collecting plate of the present invention.

[0031] FIG3 is a schematic diagram of the top view of the composite current collecting plate of the present invention.

[0032] FIG4 is a schematic cross-sectional view of the composite nut of the present invention.

[0033] FIG5 is a schematic diagram of the top view of the composite nut of the present invention.

[0034] FIG6 is a schematic cross-sectional view of the housing of the present invention.

[0035] FIG7 is a schematic diagram of the top structure of the housing of the present invention.

[0036] In the figure, 1. collecting plate, 2. special-shaped screw, 3. special-shaped sealing gasket, 4. winding core, 5. insulating sheet, 6. outer shell, 7. special-shaped hole, 8. nut, 9. nut sealing gasket, 10. screw seat, 11. special-shaped screw, 12. threaded rod. Specific implementation method:

[0037] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0038] As shown in Figures 1-7, a method for assembling the pole end of a cylindrical battery includes a composite current collecting plate, which includes a current collecting plate 1. A special-shaped screw 2 is fixed at the center of the current collecting plate 1, and a special-shaped sealing gasket 3 is sleeved on the outside of the special-shaped screw 2; the current collecting plate 1 is laser welded to the pole tab of the winding core 4, and an insulating sheet 5 is buckled on the current collecting plate 1. The outer shell 6 buckles the insulating sheet 5, the composite current collecting plate and the winding core 4 therein, and a special-shaped hole 7 is provided in the center of the outer shell 6 to match the special-shaped sealing gasket 3. The special-shaped screw 2 passes through the special-shaped hole 7 upward and extends to the outside of the top of the outer shell 6 and is threadedly connected to the composite nut. The composite nut includes a nut 8 and a nut sealing gasket 9 provided between the nut 8 and the outer shell 6. The nut 8 is tightened with the special-shaped screw 2 to clamp the outer shell 6, and is fixed by laser welding at the threaded joint of the nut 8 and the special-shaped screw 2 to prevent the nut 8 from loosening and achieve gap fusion to ensure reliable electrical connection.

[0039] The special-shaped screw 2 includes a screw seat 10 , a special-shaped screw rod 11 and a threaded rod 12 . The screw seat 10 and the collecting plate 1 are laser welded.

[0040] The special-shaped sealing gasket 3 and the special-shaped screw 11 are combined into one body. The special-shaped sealing gasket 3 and the special-shaped screw 11 can have various shapes, and preferably a hexagonal shape.

[0041] The insulating sheet 5 is used to isolate the short circuit mode between the collecting plate 1 and the housing 6 .

[0042] The special-shaped sealing gasket 3 cooperates with the special-shaped hole 7 to position the installation of the housing 6, meeting the positioning requirements during the assembly process of the housing 6 and the special-shaped screw 2.

[0043] The nut 8 and the nut sealing gasket 9 are combined into one body.

[0044] The nut sealing gasket 9 cooperates with the special-shaped sealing gasket 3 to isolate the short circuit mode between the nut 8 and the special-shaped screw 2 and the housing 6.

[0045] The material of the nut 8 includes aluminum, copper, nickel or copper-plated nickel and the like. The material of the nut 8 can be flexibly selected for the pack application end, and has a wide range of applications.

[0046] The collecting plate 1 and the special-shaped screws 2 are made of copper.

[0047] The housing 6 is made of aluminum.

[0048] Working principle:

[0049] When assembling, the specific steps are as follows:

[0050] Step 1: Laser weld a special-shaped screw 2 at the center of the current collecting plate 1, and sleeve a special-shaped sealing gasket 3 on the outside of the special-shaped screw 2 to form a composite current collecting plate;

[0051] Step 2: Laser weld the collecting plate 1 and the tabs of the winding core 4, with the special-shaped screws 2 facing upwards;

[0052] Step 3: Buckle the insulating sheet 5 onto the collecting plate 1;

[0053] Step 4: Buckle the housing 6 with the opening facing downward over the insulating sheet 5 and the winding core 4. A special-shaped hole 7 is provided at the top center of the housing 6 to match the special-shaped sealing gasket 3 for easy positioning. The special-shaped screw 2 extends upward through the special-shaped hole 7 to the outside of the top of the housing 6;

[0054] Step 5: Compound the nut 8 and the nut sealing gasket 9 to form a composite nut;

[0055] Step 6: Rotate and install the composite nut onto the special-shaped screw 2. Tighten the nut 8 and the special-shaped screw 2 to clamp and fix the housing 6.

[0056] Step 7: Use laser welding to fix the threaded joints of the nut 8 and the special-shaped screw 2 from above to prevent the nut 8 from loosening and to fuse the gap to ensure reliable electrical connection.

[0057] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any replacement, improvement or transformation made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0058] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. A method for assembling the pole end of a cylindrical battery, characterized in that: The specific steps are as follows: Step 1: Laser-weld a special-shaped screw at the center position of the current collector plate, and sleeve a special-shaped gasket outside the special-shaped screw to form a composite current collector plate; Step 2: Laser-weld the current collector plate to the tab of the winding core, with the special-shaped screw facing upward; Step 3: Snap the insulating sheet onto the upper part of the current collector plate; Step 4: Snap the shell with the opening facing downward onto the insulating sheet and the winding core. There is a special-shaped hole matching the special-shaped gasket at the center of the top of the shell for positioning. The special-shaped screw passes upward through the special-shaped hole and extends to the outside of the top of the shell; Step 5: Combine the nut and the nut gasket to form a composite nut; Step 6: Rotate and install the composite nut onto the special-shaped screw, and the nut and the special-shaped screw cooperate to tighten and clamp the shell; Step 7: Laser-weld and fix the threaded mating part of the nut and the special-shaped screw from above.

2. The pole end assembly method of a cylindrical battery according to claim 1, characterized in that: The special-shaped screw includes a screw seat, a special-shaped screw rod and a threaded rod, and laser welding is performed between the screw seat and the current collector plate.

3. A method for assembling the pole end of a cylindrical battery according to claim 2, characterized in that: The special-shaped gasket is integrated with the special-shaped screw rod.

4. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The insulating sheet is used to isolate the short-circuit mode between the current collector plate and the shell.

5. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The special-shaped gasket cooperates with the special-shaped hole to position the installation of the shell.

6. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The nut is integrated with the nut gasket.

7. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The nut gasket cooperates with the special-shaped gasket to isolate the short-circuit mode between the nut and the special-shaped screw and the shell.

8. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The material of the nut includes aluminum, copper, nickel or nickel-plated copper.

9. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The current collector plate and the special-shaped screw are made of copper.

10. A method for assembling the pole end of a cylindrical battery according to claim 1, characterized in that: The shell is made of aluminum.

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