Self-positioning over-welding cylindrical battery pole terminal structure

Abstract

The utility model relates to the technical field of cylindrical batteries, in particular to a self-positioning over-welding cylindrical battery pole end structure. Comprising a current collecting disc, a frustum is welded and fixed to the center of the current collecting disc, the current collecting disc is in laser welding with a tab of a roll core, an insulating sheet is buckled on the current collecting disc, the insulating sheet, the current collecting disc, the frustum and the roll core are buckled into a shell, a pole is arranged in the center of the shell, a conical hole matched with the frustum is formed in the center of the pole, and the conical hole is used for positioning the frustum. The frustum is attached to the conical hole in a sealed mode under the action of pressure, and laser welding is conducted on a gap between the frustum and the pole from the outside. During assembly, the frustum can automatically enter the taper hole under the action of pressure to achieve self-positioning, positioning is accurate, and the positioning requirement in the assembly process is met; the sealing and electric connection reliability is effectively ensured; and over-welding is not prone to occurring during laser welding, multiple-time and high-energy welding modes can be compatible, the fusion depth compatibility range is wide, and gap fusion is easier to achieve to ensure the sealing effect.

Description

Technical field:

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a self-positioning and over-welding cylindrical battery pole terminal structure. Background technology:

[0002] At present, the pole end structure of cylindrical batteries generally includes a pole and a shell. The inner and outer sides of the pole are fixed to the shell by rivets, and a gasket is provided between the pole and the shell for sealing and insulation. The pole also needs to be welded and fixed to the collector plate. This structure is complex in design, the production line equipment manufacturing process is cumbersome, there are many precision positioning, the processing efficiency and qualified rate are low, the welding process consistency and sealing are difficult to ensure, and when welding between the pole and the collector plate, it is not easy to position, and it is easy to over-weld during welding, resulting in sealing difficulties, and a lot of metal debris is generated, which affects the internal electrical performance of the battery, and there is a problem of unstable battery internal resistance.

[0003] In summary, the positioning and over-welding problems of the cylindrical battery terminal structure have become technical problems that need to be solved urgently in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a self-positioning and weldable cylindrical battery pole terminal structure, which solves the problem of difficult positioning in the previous assembly process, and solves the problem of difficult sealing during welding and difficult to ensure welding quality.

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

[0006] A self-positioning and weldable cylindrical battery pole end structure comprises a current collecting plate, a frustum is welded and fixed at the center of the current collecting plate, the current collecting plate and the pole ear of the winding core are laser welded, an insulating sheet is buckled on the current collecting plate, and an outer shell buckles the insulating sheet, the current collecting plate, the frustum and the winding core therein, a pole is provided at the center of the outer shell, a conical hole matching the frustum is provided at the center of the pole, the conical hole is used to position the frustum, the frustum is sealed with the conical hole under pressure, and the gap between the frustum and the pole is laser welded from the outside.

[0007] The frustum is made of the same material as the pole.

[0008] The frustum and the pole are both made of aluminum.

[0009] The insulating sheet is used to isolate the short circuit mode between the collecting plate and the housing.

[0010] The inner and outer sides of the pole are riveted and fixed to the shell respectively, and a sealing gasket is arranged between the pole and the shell.

[0011] The sealing gasket is used to isolate the short circuit mode between the pole and the shell.

[0012] The top of the frustum is flush with the upper surface of the pole.

[0013] The utility model adopts the above scheme and has the following advantages:

[0014] A frustum is fixed by welding at the center of the collecting plate, and a conical hole matching the frustum is provided at the center of the pole. Firstly, the conical hole can be used to position the frustum. During assembly, the frustum will automatically enter the conical hole under pressure to achieve self-positioning, and the positioning is accurate, meeting the positioning requirements during the assembly process; secondly, the frustum and the conical hole fit better under pressure, and the reliability of sealing and electrical connection is effectively guaranteed; thirdly, since the welding diameter at the top of the frustum is small, it is not easy to over-weld during laser welding, and it is compatible with multiple and high-energy welding modes, with a wide compatible range of fusion depth, making it easier to achieve gap fusion to ensure the sealing effect. Description of the drawings:

[0015] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0016] In the figure, 1, collecting plate, 2, cone, 3, winding core, 4, insulating sheet, 5, shell, 6, pole, 7, conical hole, 8, sealing gasket. Specific implementation method:

[0017] 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.

[0018] like Figure 1 As shown, a self-positioning and over-weldable cylindrical battery pole end structure includes a current collecting plate 1, a frustum 2 is welded and fixed at the center of the current collecting plate 1, the pole ears of the current collecting plate 1 and the winding core 3 are laser welded, an insulating sheet 4 is buckled on the current collecting plate 1, and the outer shell 5 buckles the insulating sheet 4, the current collecting plate 1, the frustum 2 and the winding core 3 therein, a pole 6 is provided at the center of the outer shell 5, and a conical hole 7 matching the frustum 2 is provided at the center of the pole 6, the conical hole 7 is used to position the frustum 2, the frustum 2 is sealed with the conical hole 7 under pressure, and the gap between the frustum 2 and the pole 6 is laser welded from the outside.

[0019] The frustum 2 and the pole 6 are made of the same material.

[0020] The frustum 2 and the pole 6 are both made of aluminum.

[0021] The insulating sheet 4 is used to isolate the short circuit mode between the collecting plate 1 and the housing 5 .

[0022] The inner and outer sides of the pole 6 are riveted and fixed to the housing 5 respectively, and a sealing gasket 8 is provided between the pole 6 and the housing 5 .

[0023] The sealing gasket 8 is used to isolate the short circuit mode between the pole 6 and the housing 5 .

[0024] The top of the frustum 2 is flush with the upper surface of the pole 6 to ensure a beautiful appearance.

[0025] Working principle:

[0026] During assembly, first weld a frustum 2 of fixed size at the central position of the current collecting disk 1, then laser weld the pole ears of the current collecting disk 1 and the winding core 3, so that one side of the frustum 2 faces upward, then buckle the insulating sheet 4 on the top of the current collecting disk 1, and the frustum 2 passes through the through hole in the center of the insulating sheet 4 upward, and then buckle the insulating sheet 4, the current collecting disk 1, the frustum 2 and the winding core 3 into the shell 5 with the opening facing downward, and the frustum 2 is self-positioned in the conical hole 7 in the center of the pole 6. Under the action of pressure, the frustum 2 enters the middle of the conical hole 7 and achieves top fitting, and finally, the gap between the frustum 2 and the pole 6 is laser welded vertically from top to bottom to achieve gap fusion and ensure sealing.

[0027] The above 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.

[0028] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A self-positioning and over-weldable cylindrical battery pole terminal structure, characterized in that: It includes a collecting plate, a frustum is welded and fixed at the center of the collecting plate, the collecting plate and the pole ears of the winding core are laser welded, an insulating sheet is buckled on the collecting plate, the insulating sheet, the collecting plate, the frustum and the winding core are buckled into the outer shell, a pole is provided at the center of the outer shell, a conical hole matching the frustum is provided at the center of the pole, the conical hole is used to position the frustum, the frustum is sealed with the conical hole under pressure, and the gap between the frustum and the pole is laser welded from the outside.

2. A self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 1, characterized in that: The frustum is made of the same material as the pole.

3. A self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 2, characterized in that: The frustum and the pole are both made of aluminum.

4. The self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 1, characterized in that: The insulating sheet is used to isolate the short circuit mode between the collecting plate and the housing.

5. The self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 1, characterized in that: The inner and outer sides of the pole are riveted and fixed to the shell respectively, and a sealing gasket is arranged between the pole and the shell.

6. A self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 5, characterized in that: The sealing gasket is used to isolate the short circuit mode between the pole and the shell.

7. The self-positioning and over-weldable cylindrical battery pole terminal structure according to claim 1, characterized in that: The top of the frustum is flush with the upper surface of the pole.

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