Aluminum-casing cylindrical battery structure into which electrolyte is injected from post end

Abstract

The present invention relates to the technical field of cylindrical batteries, and in particular to an aluminum-casing cylindrical battery structure into which an electrolyte is injected from a post end. The structure comprises a casing, in which a jellyroll is provided, the top of the jellyroll being a negative electrode end, and the bottom of the jellyroll being a positive electrode end. The positive electrode end comprises a cover plate, the edge of the cover plate being laser welded to the bottom of the casing. The bottom of the cover plate is laser welded to a positive tab of the jellyroll, an explosion-proof valve being provided in the center of the cover plate. An electrolyte injection hole for electrolyte injection is provided in the centers of a negative electrode current collector disc and a stud. The present invention simplifies the structure of the positive electrode end, greatly reduces the costs of structural parts, takes full advantage of the internal space of a battery cell, and changes the previous mode of electrolyte injection from the bottom to electrolyte injection from the top, such that the number of times of flipping over the cylindrical battery is reduced, simplifying the process and reducing device investment costs. After electrolyte injection and formation, a sealing nail is mounted into the electrolyte injection hole of the stud, and the top end of the sealing nail and the stud are laser welded to each other, thus effectively ensuring the reliability of sealing and electrical connection.

Description

Pole end liquid injection aluminum shell cylindrical battery structure TECHNICAL FIELD

[0001] The present application relates to the technical field of cylindrical battery, in particular to a pole end liquid injection aluminum shell cylindrical battery structure. BACKGROUND

[0002] At present, in the production and manufacturing process of the aluminum shell cylindrical battery, the negative pole end is generally riveted with the copper-nickel plated pole and the aluminum shell, the negative pole current collector is laser welded with the negative pole lug of the winding core, and the copper needle is inserted into the winding core to resistance weld the negative pole current collector and the copper-nickel plated pole; then liquid injection is performed, during which the cylindrical battery needs to be turned over by 180 degrees for liquid injection from the positive pole end, and after the battery is completed liquid injection and formed, the positive pole end is installed; at present, the positive pole end is generally riveted with the cover plate and the adapter piece, one end of the adapter piece is welded with the positive pole current collector of the winding core, the positive pole current collector is laser welded with the positive pole lug of the winding core, and then the adapter piece is bent to buckle the cover plate on the shell for peripheral welding. The defects of the existing structure are that the welding slag generated in the winding core of the negative pole end cannot be effectively removed, the overcurrent capacity is generally poor, and the negative pole riveting method has poor flexibility for the use of the pack end; and the cover plate and the adapter piece of the positive pole end have complex structure design, high cost, and the bending of the adapter piece occupies a large internal space of the cylindrical battery; in addition, the cylindrical battery needs to be turned over multiple times in the production process, which leads to complex production process and increases the equipment investment cost.

[0003] In summary, the above-mentioned problems of the negative pole end and the positive pole end of the aluminum shell cylindrical battery have become technical problems that need to be solved in the industry. SUMMARY

[0004] The present application provides a pole end liquid injection aluminum shell cylindrical battery structure to solve the problems of the previous negative pole end internal welding slag not easy to remove, poor overcurrent capacity, and poor flexibility for the use of the pack end, the problems of the previous positive pole end structure design complex, high cost, and occupying a large internal space of the cylindrical battery, and the problem of the previous production process needing to turn over the cylindrical battery multiple times.

[0005] The technical scheme adopted by the present application to solve the above technical problems is:

[0006] The application discloses a cylindrical battery structure with liquid injection at the end of a pole, which comprises a shell, a winding core arranged in the shell, a negative pole end at the top of the winding core and a positive pole end at the bottom of the winding core.

[0007] The positive pole end comprises a cover plate, the edge of the cover plate is laser welded with the bottom of the shell, the bottom of the cover plate is laser welded with the positive pole lug of the winding core, and the middle of the cover plate is provided with an explosion-proof valve.

[0008] The middle of the negative pole current collector and the stud is provided with an injection hole for liquid injection, a sealing nail is arranged in the injection hole of the stud after liquid injection, and the top end of the sealing nail is laser welded with the stud.

[0009] The upper part of the injection hole of the stud is a polygonal hole for locking and fixing, and the lower part is a circular hole.

[0010] The upper part of the sealing nail is a polygonal platform matched with the polygonal hole, and the lower part is a cylinder matched with the circular hole.

[0011] The nut and the stud flange cooperate to clamp and fix the upper insulating sheet, the shell and the sealing gasket.

[0012] The nut and the top of the stud are flush in height, and the stud and the top of the sealing nail are flush in height.

[0013] The lower insulating sheet is used for isolating the short circuit mode between the negative pole current collector and the shell.

[0014] The sealing gasket is used for isolating the short circuit mode between the stud, the stud flange and the shell.

[0015] The upper insulating sheet is used for isolating the short circuit mode between the nut and the shell.

[0016] The material of the nut comprises aluminum, copper, nickel or nickel-plated copper, and the material of the sealing nail is nickel-plated copper.

[0017] The upper insulating sheet and the lower insulating sheet are made of PP or PET.

[0018] The application has the following advantages by adopting the above scheme.

[0019] The negative pole end is welded by laser welding the negative pole current collector plate and the stud flange at the bottom of the stud, the stud is threaded through the center hole of the shell and is connected with the nut arranged outside the shell, the welding slag generated by internal welding is avoided, the overcurrent capacity is ensured, the nut can be selected according to the application requirements of the pack end, the application range is wide, and the production line compatibility is strong.

[0020] The positive pole end only needs to be provided with a cover plate and an explosion-proof valve, the structure is simplified, the cost of structural parts is greatly reduced, and meanwhile, the internal space of the battery cell is fully utilized.

[0021] A liquid injection hole is arranged between the negative pole current collector plate and the stud for liquid injection, the bottom liquid injection mode is changed into top liquid injection, the number of times of turning over of the cylindrical battery is reduced, the process is simplified, the equipment investment cost is reduced, after liquid injection and chemical reaction, the sealing pin is arranged in the liquid injection hole of the stud, laser welding is performed between the top end of the sealing pin and the stud, and the sealing and electrical connection reliability are effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a schematic view of the sectional structure of the present application.

[0023] Fig. 2 is a schematic view of the top structure of the present application.

[0024] Fig. 3 is a schematic view of the bottom structure of the present application.

[0025] In the drawings, 1 is a shell, 2 is a winding core, 3 is a negative pole current collector plate, 4 is a stud, 5 is a stud flange, 6 is a lower insulating sheet, 7 is a sealing gasket, 8 is a nut, 9 is an upper insulating sheet, 10 is a cover plate, 11 is an explosion-proof valve, 12 is a liquid injection hole, and 13 is a sealing pin. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of the present application, the present application will be described in detail below with reference to specific embodiments and in combination with the accompanying drawings.

[0027] As shown in Figs. 1-3, an aluminum shell cylindrical battery structure with liquid injection at the pole end comprises a shell 1, a winding core 2 is arranged in the shell 1, the top of the winding core 2 is a negative pole end, and the bottom of the winding core 2 is a positive pole end, characterized in that the negative pole end comprises a negative pole current collector plate 3 laser welded with the negative pole lug of the winding core 2, the center position of the negative pole current collector plate 3 is laser welded with a stud flange 5 at the bottom of a stud 4, a lower insulating sheet 6 is arranged between the negative pole current collector plate 3 and the shell 1, a sealing gasket 7 is arranged between the stud 4 and the stud flange 5 and the shell 1, the stud 4 is threaded through the center hole of the shell 1 and is connected with a nut 8 arranged outside the shell 1, an upper insulating sheet 9 is arranged between the nut 8 and the shell 1, laser welding is performed at the threaded joint of the nut 8 and the stud 4 to prevent loosening, dustproof sealing is achieved, and reliable electrical connection is realized.

[0028] The positive electrode end comprises a cover plate 10, the edge of which is laser welded with the bottom of the shell 1, the bottom of which is laser welded with the positive electrode tab of the roll core 2, and the middle of which is provided with an explosion-proof valve 11 for overpressure protection;

[0029] The middle of the negative electrode current collector 3 and the stud 4 is provided with a liquid injection hole 12 for liquid injection, and after the liquid injection is completed, a sealing pin 13 is installed in the liquid injection hole 12 of the stud 4, and the top end of the sealing pin 13 is laser welded with the stud 4, so that the sealing and electrical connection reliability are effectively guaranteed.

[0030] The upper part of the liquid injection hole 12 of the stud 4 is a polygonal hole for positioning the stud when locked with a wrench, and the lower part is a circular hole.

[0031] The upper part of the sealing pin 13 is a polygonal platform matched with the polygonal hole, and the lower part is a circular column matched with the circular hole, so as to seal the liquid injection hole 12.

[0032] The nut 8 cooperates with the stud flange 5 to clamp and fix the upper insulating sheet 9, the shell 1, and the sealing gasket 7.

[0033] The top of the stud 4 is flush with the top of the sealing pin 13.

[0034] The lower insulating sheet 6 is used to isolate the short circuit mode between the negative electrode current collector 3 and the shell 1.

[0035] The sealing gasket 7 is used to isolate the short circuit mode between the stud 4, the stud flange 5, and the shell 1, and also plays a sealing role.

[0036] The upper insulating sheet 9 is used to isolate the short circuit mode between the nut 8 and the shell 1.

[0037] The material of the nut 8 includes aluminum, copper, nickel, or copper-plated nickel, and the nut material can be flexibly selected for pack application, so as to have a wide range of applications, and the material of the sealing pin is copper-plated nickel.

[0038] The upper insulating sheet 9 and the lower insulating sheet 6 are made of PP or PET material.

[0039] Working principle:

[0040] In assembly, first, the stud flange 5 and the negative current collector 3 are laser welded to form a composite current collector with the gasket 7, then the negative current collector 3 is laser welded with the negative tab of the core 2, then the stud 4 is upward, the lower insulating sheet 6 is buckled above the negative current collector 3, then the core 2 is buckled into the shell 1 with the opening downward, the central protruding part of the gasket 7 on the stud 4 passes through the round hole on the top of the shell 1, then the upper insulating sheet 9 is sleeved on the stud 4 above the shell 1, then the nut 8 is rotated and installed on the stud 4, when fastening, the hexagonal wrench of corresponding size needs to be inserted into the multi-angle hole of the liquid injection hole 12 in the middle of the stud 4, at the same time, the sleeve wrench of corresponding size is sleeved on the outside of the nut 8 and is rotated clockwise to be tightened to the fixed torque, at this time, the gasket 7 is deformed to form a seal, then the thread joint between the nut 8 and the stud 4 is welded and fixed by laser from above, so that the nut 8 is not loose, at the same time, the gap is fused to ensure reliable electrical connection, and the negative terminal is completed; then the positive cover plate 10 is tightly pressed on the bottom opening side of the shell 1, so as to press the positive tab of the core 2, then the periphery is laser welded, then the laser penetration welding is performed at the bottom of the cover plate 10 to realize the electrical connection between the cover plate 10 and the internal positive tab, and the positive terminal is completed; then the liquid is injected from the liquid injection hole 12 of the stud 4 and the negative current collector 3, after the battery is completed, the sealing nail 13 is installed in the liquid injection hole 12 of the stud 4 and is tightly welded by laser to complete the sealing of the entire core 2, and the entire cylindrical battery is assembled.

[0041] The above specific embodiments cannot be regarded as a limitation on the protection scope of the present application, and any alternative improvement or change made by those skilled in the art to the embodiments of the present application falls within the protection scope of the present application.

[0042] The details not described in the present application are the known technology of those skilled in the art.

Claims

1. A cylindrical aluminum-cased battery structure with electrolyte injection at the terminal end, comprising a casing, a winding core disposed within the casing, the top of the winding core being the negative terminal and the bottom of the winding core being the positive terminal, characterized in that: The negative electrode includes a negative electrode current collector that is laser-welded to the negative electrode lug of the core. The center of the negative electrode current collector is laser-welded to the stud flange at the bottom of the stud. A lower insulating sheet is provided between the negative electrode current collector and the housing. A sealing gasket is provided between the stud and the stud flange and the housing. The stud passes upward through the center hole of the housing and is threadedly connected to a nut located on the outside of the housing. An upper insulating sheet is provided between the nut and the housing. The threaded engagement point of the nut and the stud is laser-welded. The positive terminal includes a cover plate, the edge of which is laser-welded to the bottom of the housing, the bottom of which is laser-welded to the positive electrode lug of the core, and the cover plate has an explosion-proof valve in the middle. The negative electrode current collector and the stud are provided with a liquid injection hole for liquid injection. After the liquid is injected and formed, the sealing nail is installed into the liquid injection hole of the stud, and the top of the sealing nail is laser welded to the stud.

2. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The upper part of the injection hole of the stud is a polygonal hole for locking and fixing, and the lower part is a round hole.

3. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 2, characterized in that: The upper part of the sealing nail is a multi-faceted platform that mates with a multi-faceted hole, and the lower part is a cylinder that mates with a round hole.

4. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The nut, in conjunction with the stud flange, clamps and secures the upper insulating sheet, housing, and sealing gasket.

5. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The nut is level with the top of the stud, and the stud is level with the top of the sealing pin.

6. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The lower insulating sheet is used to isolate the short circuit mode between the negative current collector and the housing.

7. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The sealing gasket is used to isolate short-circuit modes between the stud, stud flange and housing.

8. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The upper insulating sheet is used to isolate short circuits between the nut and the housing.

9. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The nut is made of aluminum, copper, nickel, or nickel-plated copper, and the sealing nail is made of nickel-plated copper.

10. The aluminum-cased cylindrical battery structure with electrolyte injection at the terminal end according to claim 1, characterized in that: The upper and lower insulating sheets are made of PP or PET material.

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