Aluminum shell cylindrical battery structure for liquid injection at pole terminal

Abstract

The utility model relates to the technical field of cylindrical batteries, in particular to an aluminum shell cylindrical battery structure with liquid injected at a pole end. Comprising a shell, a roll core is arranged in the shell, the top of the roll core is a negative electrode end, the bottom of the roll core is a positive electrode end, the positive electrode end comprises a cover plate, the edge of the cover plate and the bottom of the shell are subjected to laser welding, the bottom of the cover plate and a positive electrode lug of the roll core are subjected to laser welding, and an anti-explosion valve is arranged in the middle of the cover plate; and a liquid injection hole for injecting liquid is formed between the negative collector plate and the stud. The structure of the positive electrode end is simplified, the cost of structural parts is greatly reduced, and meanwhile, the internal space of the battery cell is fully utilized; compared with the prior art, a conventional bottom liquid injection mode is changed into a top liquid injection mode, so that the turning frequency of the cylindrical battery is reduced, the process is simplified, the equipment investment cost is reduced, the sealing nail is arranged in the liquid injection hole of the stud after the liquid injection is finished, the top end of the sealing nail and the stud are subjected to laser welding, and the sealing and electric connection reliability is effectively ensured.

Description

Technical field:

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to an aluminum shell cylindrical battery structure with liquid injected at the pole end. Background technology:

[0002] At present, in the production and manufacturing process of aluminum shell cylindrical batteries, the negative terminal is generally a copper nickel-plated pole riveted to the aluminum shell, and after the negative current collector and the negative ear of the winding core are laser welded, the copper needle is penetrated from the inside of the winding core to perform resistance welding on the negative current collector and the copper nickel-plated pole; then the liquid is injected. When injecting liquid, the cylindrical battery needs to be turned 180 degrees and the liquid is injected from the positive end. After the battery is completed, the positive end is installed; currently, the positive end is generally a cover plate and an adapter plate riveted, one end of the adapter plate is welded to the positive current collector of the winding core, the positive current collector and the positive ear of the winding core are laser welded, and then the adapter plate is bent to buckle the cover plate on the shell for peripheral welding. The defects of the existing structural form are: the welding slag generated by the internal welding of the negative terminal core cannot be effectively removed, the current carrying capacity is generally poor, and the riveting method of the negative electrode column has poor flexibility for use on the pack end due to the single material; the cover plate and adapter plate at the positive terminal have complex structural designs and high costs, and the bending of the adapter plate occupies more internal space of the cylindrical battery; in addition, the cylindrical battery needs to be flipped multiple times during the production process, which makes the production process complicated and increases the equipment investment cost.

[0003] In summary, the above-mentioned problems at the negative and positive ends of aluminum shell cylindrical batteries have become technical challenges that urgently need to be solved in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides an aluminum shell cylindrical battery structure with liquid injection at the pole end, which solves the problems of difficult removal of welding slag inside the negative terminal, poor current flow capacity, and poor flexibility in using the pack end, the problem of complex positive terminal structure design, high cost, and more internal space occupied by the cylindrical battery, and the problem of multiple flipping of the cylindrical battery in the previous production process.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An aluminum shell cylindrical battery structure with liquid injection at the pole end, comprising a shell, a winding core is arranged in the shell, the top of the winding core is the negative terminal, and the bottom of the winding core is the positive terminal, characterized in that: the negative terminal comprises a negative current collector plate laser welded to the negative pole ear of the winding core, the center position of the negative current collector plate is laser welded to the stud flange at the bottom of the stud, a lower insulating sheet is arranged between the negative current collector plate and the shell, a sealing gasket is arranged between the stud and the stud flange and the shell, the stud passes through the center hole of the shell upwards and is threadedly connected with a nut arranged on the outside of the shell, an upper insulating sheet is arranged between the nut and the shell, and the threaded joint of the nut and the stud is laser welded;

[0007] The positive terminal includes a cover plate, the edge of the cover plate is laser welded to the bottom of the shell, the bottom of the cover plate is laser welded to the positive ear of the winding core, and an explosion-proof valve is provided in the middle of the cover plate;

[0008] A liquid injection hole is provided between the negative electrode current collecting plate and the stud for liquid injection. After liquid injection, a sealing nail is installed in the liquid injection hole of the stud, and laser welding is performed between the top end of the sealing nail and 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 round 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 cooperates with the stud flange to clamp and fix the upper insulating sheet, the shell and the sealing gasket.

[0012] The nut is flush with the top of the stud, and the stud is flush with the top of the sealing nail.

[0013] The lower insulating sheet is used to isolate the short circuit mode between the negative electrode current collecting disc and the shell.

[0014] The sealing gasket is used to isolate the short circuit mode between the stud, the stud flange and the housing.

[0015] The upper insulating sheet is used to isolate the short circuit mode between the nut and the housing.

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

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

[0018] The utility model adopts the above scheme and has the following advantages:

[0019] The negative terminal is laser welded to the negative collector plate and the stud flange at the bottom of the stud. The stud passes through the center hole of the shell and is threadedly connected to the nut on the outside of the shell, avoiding welding slag from internal welding and ensuring the flow capacity. The nut can be made of a variety of materials to match the application requirements of the pack end, with a wide range of applications and strong production line compatibility.

[0020] Only a cover plate and an explosion-proof valve need to be provided at the positive end, which simplifies the structure, greatly reduces the cost of structural parts, and makes full use of the internal space of the battery cell.

[0021] An injection hole is provided between the negative electrode current collector and the stud for injection, which changes the previous bottom injection method to top injection, reduces the number of flipping of the cylindrical battery, simplifies the process, and reduces the equipment investment cost. After the injection, the sealing nail is installed in the injection hole of the stud, and the top of the sealing nail is laser welded to the stud, so that the reliability of the sealing and electrical connection is effectively guaranteed. Description of the drawings:

[0022] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0023] Figure 2 It is a schematic diagram of the top structure of the utility model.

[0024] Figure 3 It is a schematic diagram of the structure of the utility model when viewed from above.

[0025] In the figure, 1, shell, 2, winding core, 3, negative electrode current collecting plate, 4, studs, 5, stud flange, 6, lower insulating sheet, 7, sealing gasket, 8, nut, 9, upper insulating sheet, 10, cover plate, 11, explosion-proof valve, 12, injection hole, 13, sealing nail. Specific implementation method:

[0026] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0027] like Figure 1-3As shown, an aluminum shell cylindrical battery structure with liquid injection at the pole end includes a shell 1, a winding core 2 is arranged in the shell 1, the top of the winding core 2 is the negative terminal, and the bottom of the winding core 2 is the positive terminal, characterized in that: the negative terminal includes a negative current collector 3 laser-welded to the negative pole ear of the winding core 2, the center position of the negative current collector 3 is laser-welded to the stud flange 5 at the bottom of the stud 4, a lower insulating sheet 6 is arranged between the negative current collector 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 passes through the center hole of the shell 1 upwards and is threadedly connected with a nut 8 arranged on the outside of the shell 1, an upper insulating sheet 9 is arranged between the nut 8 and the shell 1, and the threaded joints of the nut 8 and the stud 4 are laser-welded to prevent loosening, seal and prevent dust, and achieve reliable electrical connection;

[0028] The positive terminal includes a cover plate 10, the edge of the cover plate 10 is laser welded to the bottom of the shell 1, the bottom of the cover plate 10 is laser welded to the positive ear of the winding core 2, and the middle of the cover plate 10 is provided with an explosion-proof valve 11 to play an overpressure protection role;

[0029] A liquid injection hole 12 is provided between the negative electrode current collecting plate 3 and the stud 4 for liquid injection. After liquid injection, a sealing nail 13 is installed in the liquid injection hole 12 of the stud 4. The top of the sealing nail 13 is laser welded to the stud 4, and the reliability of sealing and electrical connection is effectively guaranteed.

[0030] The upper portion of the injection hole 12 of the stud 4 is a polygonal hole for positioning the stud in cooperation with a wrench during tightening, and the lower portion is a round hole.

[0031] The upper part of the sealing nail 13 is a polygonal table matched with the polygonal hole, and the lower part is a cylinder matched with the circular hole, so as to achieve the sealing of the injection hole 12.

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

[0033] The nut 8 is flush with the top of the stud 4 , and the stud 4 is flush with the top of the sealing nail 13 .

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

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

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

[0037] The material of the nut 8 includes aluminum, copper, nickel or copper-plated nickel. The nut material can be flexibly selected for the pack application end, and the application range is wide. The material of the sealing nail is copper-plated nickel.

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

[0039] Working principle:

[0040] During assembly, first laser weld the stud flange 5 and the negative electrode collector plate 3, then install the sealing gasket 7 to form a composite collector plate, then laser weld the negative electrode collector plate 3 and the negative ear of the winding core 2, then turn the stud 4 upward, buckle the lower insulating sheet 6 on the negative electrode collector plate 3, and then buckle the winding core 2 into it with the shell 1 opening facing downward, and the central raised part of the sealing gasket 7 on the stud 4 passes through the circular hole on the top of the shell 1, and then put the upper insulating sheet 9 on the stud 4 above the shell 1, and then rotate the nut 8 to install it on the stud 4. When tightening, a hexagonal wrench of the corresponding size needs to be inserted into the polygonal hole of the middle injection hole 12 of the stud 4, and at the same time, a socket wrench of the corresponding size is put on the outside of the nut 8 and tightened clockwise to a fixed torque. At this time, the sealing gasket 7 will produce a certain shape. Deform into a seal, and then use laser welding to fix the threaded joints of the nut 8 and the stud 4 from above to prevent the nut 8 from loosening and fuse the gap to ensure reliable electrical connection, and the negative terminal is assembled; then press the positive cover 10 tightly on the bottom opening side of the shell 1 to press the positive ear of the winding core 2, and then perform peripheral laser welding after pressing, and then perform laser penetration welding at the bottom of the cover 10 to achieve electrical connection between the cover 10 and the internal positive ear, and the positive terminal is assembled; then inject liquid from the injection hole 12 of the stud 4 and the negative current collecting plate 3. After the battery is injected and formed, install the sealing nail 13 into the injection hole 12 of the stud 4 and press it tightly, and then perform laser welding to complete the sealing of the entire winding core 2, and the entire cylindrical battery is assembled.

[0041] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0042] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An aluminum shell cylindrical battery structure with liquid injection at the pole end, comprising a shell, a winding core is arranged in the shell, the top of the winding core is the negative terminal, and the bottom of the winding core is the positive terminal, characterized in that: The negative terminal includes a negative electrode collector plate laser welded to the negative electrode ear of the winding core, the center position of the negative electrode collector plate is laser welded to the stud flange at the bottom of the stud, a lower insulating sheet is provided between the negative electrode collector plate and the shell, a sealing gasket is provided between the stud and the stud flange and the shell, the stud passes upward through the center hole of the shell and is threadedly connected to a nut provided on the outside of the shell, an upper insulating sheet is provided between the nut and the shell, and the threaded joint of the nut and the stud is laser welded; The positive terminal includes a cover plate, the edge of the cover plate is laser welded to the bottom of the shell, the bottom of the cover plate is laser welded to the positive ear of the winding core, and an explosion-proof valve is provided in the middle of the cover plate; A liquid injection hole is provided between the negative electrode current collecting plate and the stud for liquid injection. After liquid injection, a sealing nail is installed in the liquid injection hole of the stud, and laser welding is performed between the top end of the sealing nail and the stud.

2. The aluminum shell cylindrical battery structure with liquid injection at the pole 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 shell cylindrical battery structure with liquid injection at the pole end according to claim 2, characterized in that: 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.

4. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The nut cooperates with the stud flange to clamp and fix the upper insulating sheet, the shell and the sealing gasket.

5. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The nut is flush with the top of the stud, and the stud is flush with the top of the sealing nail.

6. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The lower insulating sheet is used to isolate the short circuit mode between the negative electrode collector disc and the shell.

7. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The sealing gasket is used to isolate the short circuit mode between the stud, the stud flange and the housing.

8. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The upper insulating sheet is used to isolate the short circuit mode between the nut and the housing.

9. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The material of the nut includes aluminum, copper, nickel or copper plated with nickel, and the material of the sealing pin is copper plated with nickel.

10. The aluminum shell cylindrical battery structure with liquid injection at the pole end according to claim 1, characterized in that: The upper insulating sheet and the lower insulating sheet are made of PP or PET.

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