Cylindrical battery sealed and connected by glue

Abstract

The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery sealed and connected by glue. Comprising a negative current collecting disc, a pole is welded and fixed to the center of the negative current collecting disc, an insulating sheet is buckled on the negative current collecting disc and the pole, the insulating sheet and the pole are bonded and fixed through structural adhesive, the insulating sheet, the pole, the negative current collecting disc and a roll core are buckled into a shell, and the shell and the insulating sheet are bonded and fixed through structural adhesive; the bottom of the shell is fixedly welded to the edge of the positive collector plate, a liquid injection hole is formed in the center of the positive collector plate, a mounting groove is formed in the lower surface of the positive collector plate, the positive collector plate and a positive lug of the roll core are subjected to laser welding from the outer side of the mounting groove, and a sealing piece is arranged in the mounting groove. And the sealing sheet and the positive collector plate are bonded and fixed through a structural adhesive. The conventional welding and riveting procedures are cancelled, the process steps are simplified, the cost is reduced, metal chips and high temperature are prevented from being generated inside to scald the diaphragm, and the percent of pass is greatly improved.

Description

Technical field:

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery sealed and connected with glue. Background technology:

[0002] At present, when assembling the negative electrode structure of a cylindrical battery, the negative electrode current collector is first welded to the pole ear of the winding core, and then an insulating sheet is covered on the negative electrode current collector, and finally the battery is put into the shell. The pole and the outer shell are generally riveted and sealed, and the pole and the negative electrode current collector are welded. This structure is complex in design, the production line equipment manufacturing process is cumbersome, the equipment investment is heavy, the processing qualification rate is low, and the internal space utilization rate is low. At the same time, due to the large welding thickness between the pole and the negative electrode current collector, resistance welding or ultrasonic torque welding with high heat generation is generally used, which can easily lead to the generation of internal metal chips and burns of the diaphragm. Similarly, when assembling the positive electrode structure of a cylindrical battery, resistance welding or ultrasonic torque welding is generally used when the positive electrode current collector is welded to the pole ear of the winding core due to the large welding thickness. The welding slag generated during welding will remain in the battery and cannot be removed, which can easily cause discharge, short circuit and other faults, affecting the battery quality, and it is difficult to seal after welding, which is prone to leakage.

[0003] In summary, the assembly and sealing problems of the positive and negative electrode structures in cylindrical batteries have become technical problems that need to be urgently solved in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a cylindrical battery sealed and connected with glue, which solves the problems of complex design and high cost of negative electrode structure, easy generation of metal chips and scald of diaphragm when welding the pole and the negative electrode collector, and solves the problem of welding slag remaining inside the battery and difficulty in sealing when welding the positive electrode structure.

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

[0006] A cylindrical battery sealed and connected with glue, comprising a negative current collector disk, a pole is welded and fixed at the center of the negative current collector disk, an insulating sheet is buckled on the negative current collector disk and the pole, the insulating sheet and the pole are bonded and fixed by structural adhesive, a plurality of holes are provided on the insulating sheet, the negative current collector disk and the negative pole ear of the winding core are welded and fixed at the hole positions, an outer shell buckles the insulating sheet, the pole, the negative current collector disk and the winding core therein, a through hole is provided at the center of the outer shell to match the pole, the pole passes through the through hole upward to the outside of the top of the outer shell, and the outer shell and the insulating sheet are bonded and fixed by structural adhesive; the bottom of the outer shell is welded and fixed to the edge of the positive current collector disk, a liquid injection hole is provided at the center of the positive current collector disk, a mounting groove is provided on the lower surface of the positive current collector disk, the positive current collector disk and the positive pole ear of the winding core are laser welded from the outside of the mounting groove, a sealing sheet is provided in the mounting groove, and the sealing sheet and the positive current collector disk are bonded and fixed by structural adhesive.

[0007] The pole comprises a pole body and a pole flange, and the pole body and the pole flange are respectively fixedly connected to the negative electrode current collecting plate by annular laser welding.

[0008] The pole flange is bonded and fixed to the insulating sheet by means of structural adhesive.

[0009] The lower surface of the insulating sheet is provided with a positioning groove which matches the shape of the pole flange.

[0010] The insulating sheet is provided with an insulating sleeve located between the pole body and the shell.

[0011] The insulating sheet is used to isolate the short circuit mode between the pole, the negative electrode collector and the shell.

[0012] The insulating sheet and the negative electrode current collecting disk are respectively provided with a plurality of corresponding immersion holes.

[0013] The structural adhesive between the sealing sheet and the positive electrode current collecting disc is arranged on the outer ring of the laser welding.

[0014] The utility model adopts the above scheme and has the following advantages:

[0015] By bonding the insulating sheet to the pole and the shell to the insulating sheet with structural adhesive, the previous welding and riveting processes are eliminated, the process steps are simplified, the cost is reduced, the internal metal chips and high temperature that burns the diaphragm are avoided, and the qualified rate is greatly improved;

[0016] By providing a mounting groove on the lower surface of the positive current collecting disc, the positive current collecting disc and the positive ear of the winding core are laser welded from the outside of the mounting groove, thereby reducing the welding thickness between the positive current collecting disc and the positive ear, avoiding the generation of welding slag inside the battery to cause discharge, short circuit and other faults. The sealing sheet is bonded and fixed between the positive current collecting disc in the mounting groove by structural adhesive, which has a better sealing effect and avoids bottom leakage. Description of the drawings:

[0017] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the top view of the structure of the negative electrode current collecting disk and the pole of the utility model.

[0019] Figure 3 It is a schematic diagram of the top view of the insulating sheet of the utility model.

[0020] Figure 4 The utility model is a schematic diagram of a top view of the structure of the insulating sheet, the negative electrode current collecting plate and the pole after being combined.

[0021] Figure 5 It is a schematic diagram of the structure of the positive electrode current collecting disk of the utility model when viewed from above.

[0022] In the figure, 1, negative electrode current collecting plate, 2, pole body, 3, pole flange, 4, insulating sheet, 5, structural adhesive, 6, perforation, 7, winding core, 8, negative electrode ear, 9, shell, 10, positive electrode current collecting plate, 11, liquid injection hole, 12, positive electrode ear, 13, sealing sheet, 14, insulating sleeve, 15, immersion hole. Specific implementation method:

[0023] 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.

[0024] like Figure 1-5 As shown, a cylindrical battery sealed and connected with glue comprises a negative current collector 1, a pole is welded and fixed at the center of the negative current collector 1, an insulating sheet 4 is buckled on the negative current collector 1 and the pole, the insulating sheet 4 and the pole are bonded and fixed by a structural adhesive 5, a plurality of holes 6 are provided on the insulating sheet 4, the negative current collector 1 and the negative ear 8 of the winding core 7 are welded and fixed at the position of the holes 6, a shell 9 buckles the insulating sheet 4, the pole, the negative current collector 1 and the winding core 7, and a through hole matching the pole is provided in the center of the shell 9 The pole passes through the through hole upward and extends to the outside of the top of the shell 9. The shell 9 and the insulating sheet 4 are bonded and fixed by the structural adhesive 5; the bottom of the shell 9 is welded and fixed to the edge of the positive current collecting disk 10. The center position of the positive current collecting disk 10 is provided with a liquid injection hole 11. The lower surface of the positive current collecting disk 10 is provided with a mounting groove. The positive current collecting disk 10 and the positive ear 12 of the winding core 7 are laser welded from the outside of the mounting groove. A sealing sheet 13 is provided in the mounting groove. The sealing sheet 13 and the positive current collecting disk 10 are bonded and fixed by the structural adhesive 5.

[0025] The pole comprises a pole body 2 and a pole flange 3, and the pole body 2 and the pole flange 3 are respectively fixedly connected to the negative electrode collector 1 by circular laser welding. Welding in advance on the outside avoids metal chips generated during internal welding and high temperature that may burn the diaphragm.

[0026] The pole flange 3 is bonded and fixed to the insulating sheet 4 by means of a structural adhesive 5 . The structural adhesive 5 can be applied in a circle along the pole flange 3 to ensure a firm bonding and sealing.

[0027] The lower surface of the insulating sheet 4 is provided with a positioning groove that matches the shape of the pole flange 3 and is used to install and position the pole flange 3 to prevent deviation.

[0028] The insulating sheet 4 is provided with an insulating sleeve 14 located between the pole body 2 and the shell 9 for insulating the pole body 2 and the shell 9 .

[0029] The insulating sheet 4 is used to isolate the short circuit mode between the pole, the negative electrode current collecting disc 1 and the housing 9 .

[0030] The insulating sheet 4 and the negative electrode current collecting disc 1 are respectively provided with a plurality of corresponding immersion holes 15, which are helpful for the electrolyte to penetrate into the winding core, and more electrolyte can be stored at the same time, making full use of the internal space.

[0031] The structural adhesive 5 between the sealing sheet 13 and the positive electrode current collecting disc 10 is arranged on the outer ring of the laser welding to ensure a firm bonding and sealing.

[0032] During installation, the specific assembly steps are as follows:

[0033] (1) The pole body 2 and the pole flange 3 are fixedly connected to the center of the negative electrode current collector 1 by circular laser welding to conduct the current of the winding core 7;

[0034] (2) Apply structural glue 5 along the circumference of the upper surface of the pole flange 3, then buckle the insulating sheet 4 in and press and fix it;

[0035] (3) The negative electrode current collector 1 and the negative electrode ear 8 of the winding core 7 are fixed by laser welding at the position of the hole 6 of the insulating sheet 4;

[0036] (4) Apply structural glue 5 along the circumference of the step position on the upper surface of the insulating sheet 4, and then buckle the housing 9 into place and press and fix it;

[0037] (5) Press the positive electrode current collector 10, the positive electrode ear 12 of the winding core 7 and the bottom of the shell 9 tightly, and perform peripheral welding and penetration welding;

[0038] (6) Structural glue 5 is applied along the circumference of the laser-welded outer ring in the installation groove, and then the sealing sheet 13 is fixedly pressed into the installation groove and pressed and bonded to complete the assembly.

[0039] 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.

[0040] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A cylindrical battery sealed and connected with glue, characterized in that: It comprises a negative current collector disk, a pole is welded and fixed at the center of the negative current collector disk, an insulating sheet is buckled on the negative current collector disk and the pole, the insulating sheet and the pole are bonded and fixed by structural adhesive, a plurality of holes are arranged on the insulating sheet, the negative current collector disk and the negative ear of the winding core are welded and fixed at the hole positions, the insulating sheet, the pole, the negative current collector disk and the winding core are buckled into the outer shell, a through hole matching with the pole is arranged at the center of the outer shell, the pole passes through the through hole upward and extends to the outer side of the top of the outer shell, the outer shell and the insulating sheet are bonded and fixed by structural adhesive; the bottom of the outer shell is welded and fixed to the edge of the positive current collector disk, a liquid injection hole is arranged at the center of the positive current collector disk, a mounting groove is arranged on the lower surface of the positive current collector disk, the positive current collector disk and the positive ear of the winding core are laser welded from the outside of the mounting groove, a sealing sheet is arranged in the mounting groove, and the sealing sheet and the positive current collector disk are bonded and fixed by structural adhesive.

2. A cylindrical battery sealed and connected with glue according to claim 1, characterized in that: The pole comprises a pole body and a pole flange, and the pole body and the pole flange are respectively fixedly connected to the negative electrode current collecting plate by annular laser welding.

3. A cylindrical battery sealed and connected with glue according to claim 2, characterized in that: The pole flange is bonded and fixed to the insulating sheet by means of structural adhesive.

4. A cylindrical battery sealed and connected with glue according to claim 3, characterized in that: The lower surface of the insulating sheet is provided with a positioning groove which matches the shape of the pole flange.

5. A cylindrical battery sealed and connected with glue according to claim 2, characterized in that: The insulating sheet is provided with an insulating sleeve located between the pole body and the shell.

6. A cylindrical battery sealed and connected with glue according to claim 5, characterized in that: The insulating sheet is used to isolate the short circuit mode between the pole, the negative electrode collector and the shell.

7. A cylindrical battery sealed and connected with glue according to claim 1, characterized in that: The insulating sheet and the negative electrode current collecting disk are respectively provided with a plurality of corresponding immersion holes.

8. A cylindrical battery sealed and connected with glue according to claim 1, characterized in that: The structural adhesive between the sealing sheet and the positive electrode current collecting disc is arranged on the outer ring of the laser welding.

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