CN218731348U

CN218731348U - Secondary battery top cap

Info

Publication number: CN218731348U
Application number: CN202222871619.2U
Authority: CN
Inventors: 戈志敏; 何庆庆; 唐晓伟; 张丽花; 倪大卫; 王隽; 胡庆; 黄晓伟; 李涛; 胡艳兰; 钟宇豪
Original assignee: Jiangxi Ganfeng Lienergy Technology Co Ltd
Current assignee: Jiangxi Ganfeng Lienergy Technology Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-03-24
Anticipated expiration: 2032-10-31

Abstract

The utility model provides a secondary battery top cover, including top cap piece, utmost point post, last plastic, top cap piece both ends are equipped with the fixed recess that runs through, all install utmost point post in the fixed recess, the utmost point post outside all encircles and is equipped with last plastic, all be equipped with solid fixed ring below the last plastic, gu be equipped with the reserve tank between fixed ring and the fixed recess, the utmost point post bottom all installs the sealing washer; can avoid welding when going up the plastic excessively to cause the plastic to weld and wear or to go up the plastic and weld the condition together with lower plastic, adopt laser to pierce through to weld after last plastic injection moulding, can accomplish the welding in the preformed groove, can avoid going up the plastic and weld and wear or to go up the plastic and weld together with lower plastic, the practicality is strong.

Description

Secondary cell top cap

Technical Field

The utility model relates to a lithium ion battery field especially relates to a secondary cell top cap.

Background

The power lithium battery cell is divided into a square-shell cell, a soft-package cell and a cylindrical cell. The square-shell battery is a hard-shell battery formed by combining an aluminum alloy shell and a top cover, and has the advantages of light weight, strong hardness and the like.

Among the prior art, the last plastic of square shell battery is injection moulding usually, and can appear welding excessively when all carrying out welded fastening to last plastic and lead to the fact to weld the condition of wearing the plastic, and the excessive problem of plastic welding can't effectual solution go up to current top cap piece.

To this end, we propose a secondary battery top cap to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a secondary battery top cover.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a secondary battery top cap, includes top cap piece, utmost point post, goes up the plastic, top cap piece both ends are equipped with the fixed recess that runs through, and fixed recess is formed for machining according to utmost point post size, all install utmost point post in the fixed recess, utmost point post divide into anodal utmost point post and negative terminal post, the utmost point post outside all encircles and is equipped with the plastic, goes up the plastic and be polyethylene or polypropylene material, it all is equipped with solid fixed ring to go up the plastic below, and solid fixed ring is the metal material, the solid fixed ring preferred aluminum alloy material of preferred, gu fixed ring with be equipped with the preformed groove between the fixed recess, the sealing washer is all installed to utmost point post bottom.

Further preferably, the fixed ring surrounds the outside of the pole, the sealing ring is located below the fixed ring and surrounds the outside of the pole, and the fixed ring and the sealing ring are both located in the fixed groove.

Preferably, the upper plastic is injection molded, and the upper plastic and the fixing ring are fixed by laser penetration welding.

Further preferably, a lower plastic is arranged below the top cover plate, the top cover plate and the lower plastic are clamped through bolts, and bolt holes corresponding to the bolts are formed in the lower end face of the top cover plate.

Further preferably, a buffer groove is formed in the lower plastic corresponding to the sealing ring, a chamfer is formed in the buffer groove, and the angle of the chamfer is 45 degrees.

Further preferably, the top cover plate is provided with a penetrating liquid injection hole, one side of the liquid injection hole is provided with an explosion-proof valve, and the top end of the explosion-proof valve is provided with an explosion-proof sheet.

Further preferably, the fixing ring is uniformly provided with a plurality of penetrating circular holes, and the inner surfaces of the circular holes are smooth surfaces.

Compared with the prior art, the beneficial effects of the utility model are that:

can avoid welding when going up the plastic excessively to cause the plastic to weld and wear or to go up the plastic and weld the condition together with lower plastic, adopt laser to pierce through to weld after last plastic injection moulding, can accomplish the welding in the preformed groove, can avoid going up the plastic and weld and wear or to go up the plastic and weld together with lower plastic, the practicality is strong.

Drawings

Fig. 1 is a schematic view of a secondary battery top cap provided by the present invention;

fig. 2 is an exploded view of a secondary battery top cap according to the present invention;

fig. 3 is a cross-sectional view of a top cap of a secondary battery provided by the present invention;

fig. 4 is an enlarged schematic view of a portion a in fig. 3.

In the figure: 1. a top cover sheet; 2. a pole column; 3. plastic is coated; 4. plastic is discharged; 5. a fixing ring; 6. a seal ring; 7. fixing the groove; 8. a liquid injection hole; 9. an explosion-proof valve; 10. an explosion-proof sheet; 11. reserving a groove; 12 a buffer tank.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-4, a secondary battery top cover comprises a top cover plate 1, a pole 2 and an upper plastic 3, wherein two ends of the top cover plate 1 are provided with penetrating fixing grooves 7, and the fixing grooves 7 are machined according to the size of the pole 2, specifically, are formed by mechanical punching;

the pole posts 2 are mounted in the fixing grooves 7, the pole posts 2 are divided into positive pole posts and negative pole posts, the mounting positions of upper plastic 3 outside the positive pole posts and the negative pole posts are consistent with those of the metal rings and the sealing rings 6, the upper plastic 3 surrounds the outer sides of the pole posts 2, the upper plastic 3 is made of polyethylene or polypropylene, the polyethylene or polypropylene is low in cost and stable in chemical property;

go up 3 below of plastic and all be equipped with solid fixed ring 5, gu fixed ring 5 is the metal material, gu the preferred aluminum alloy material of fixed ring 5, aluminum alloy material electric conductivity is strong, and is close with 2 electric conductivities of utmost point post, so current loss can not appear, gu fixed ring 5 with be equipped with preformed groove 11 between the fixed recess 7, sealing washer 6 is all installed to 2 bottoms of utmost point post, and sealing washer 6 is the insulating rubber material to sealing washer 6 has good compressive capacity promptly, also can effectually prevent the electric leakage.

Solid fixed ring 5 encircles 2 outsides of utmost point post, sealing washer 6 is located gu fixed ring 5 below just encircles 2 outsides of utmost point post, gu fixed ring 5 with sealing washer 6 all is located in fixed recess 7, when top cap piece 1 assembled, earlier solid fixed ring 5 card in 2 outsides of utmost point post, install solid fixed ring 5 and utmost point post 2 in fixed recess 7 again, later carry out injection moulding and go up plastic 3, at last again to last plastic 3 and solid fixed ring 5 carry out laser and pierce through the welding.

Go up plastic 3 and be injection moulding, have some to stand out in the preformed groove 11 behind the injection moulding to can carry on spacingly to sealing washer 6, sealing washer 6 can not get into in the preformed groove 11, can promote sealed effect simultaneously, go up plastic 3 with gu fixed ring 5 pierces through the laser and welds fixedly, thereby can avoid welding 3 the time-out welding of plastic to excessively cause plastic 3 to weld and wear or go up plastic 3 and the condition that plastic 4 welds down together, adopt laser to pierce through to weld after last plastic 3 injection moulding, can accomplish the welding in preformed groove 11, can avoid going up plastic 3 to weld and wear or be in the same place last plastic 3 and lower plastic 4 welding, the practicality is strong.

Top cap piece 1 below is equipped with down plastic 4, top cap piece 1 passes through the bolt joint with

lower plastic

4, and 1 terminal surface is equipped with the bolt hole corresponding with the bolt down of top cap piece, is equipped with the rectangle recess that corresponds with fixed recess 7 down on the plastic 4, can put into copper aluminium foil and 2 ultrasonic bonding of utmost point post in the rectangle recess to realize the series connection of the inside electrically conductive piece of electricity core.

Lower plastic 4 go up with sealing washer 6 corresponds department and is equipped with dashpot 12, be equipped with the chamfer on dashpot 12, the chamfer angle is 45, need push down utmost point post 2 when installing utmost point post 2, compress tightly utmost point post 2, utmost point post 2 can extrude sealing washer 6 this moment, the part of sealing washer 6 can be pushed down to dashpot 12 in to sealing washer 6 can directly not be extrudeed and cause irreversible deformation, can cushion in dashpot 12, can promote the life of sealing washer 6, the chamfer is 45 can be to sealing washer 6 better guide in the dashpot 12.

Be equipped with the notes liquid hole 8 that runs through on the top plate piece 1, it is equipped with explosion-proof valve 9 to annotate liquid hole 8 one side, explosion-proof valve 9 top is equipped with explosion-proof piece 10, and after installing top plate piece 1, can annotate liquid in to electric core through annotating liquid hole 8, later annotate liquid hole 8 through the plug is sealed, when electric core internal pressure is great when ejecting deformation of top plate piece 1, can stab explosion-proof valve 9 and explosion-proof piece 10, to the inside pressure release that carries out of electric core, can further protect top plate piece 1.

The even circular port that is equipped with a plurality of penetrations on solid fixed ring 5, and the internal surface of circular port is smooth surface, thereby when injection moulding goes up plastic 3, polyethylene or polypropylene can follow the even inflow predetermined position of circular port, thereby even circular port can realize flow equalizing and the effect that promotes the velocity of flow, can make the better faster shaping of

plastic

3, and 3 of last plastic after the shaping are filled up the circular port, form many antitorque dead levers in the circular port, can promote utmost point post 2's antitorque ability.

Claims

1. The utility model provides a secondary battery top cap, includes top cap piece, utmost point post, goes up the plastic, its characterized in that, top cap piece both ends are equipped with the fixed recess that runs through, all install utmost point post in the fixed recess, the utmost point post outside all encircles and is equipped with the plastic, it all is equipped with solid fixed ring all to go up the plastic below, gu fixed ring with be equipped with the preformed groove between the fixed recess, the sealing washer is all installed to utmost point post bottom.

2. The secondary battery top cap according to claim 1, wherein the fixing ring surrounds the outside of the post, the sealing ring is located below the fixing ring and surrounds the outside of the post, and the fixing ring and the sealing ring are both located in the fixing groove.

3. The secondary battery top cap according to claim 1, wherein the upper plastic is injection molded, and the upper plastic and the fixing ring are fixed by laser penetration welding.

4. The secondary battery top cap according to claim 1, wherein a lower plastic is arranged below the top cap piece, and the top cap piece and the lower plastic are clamped by bolts.

5. The top cap of claim 4, wherein a buffer groove is formed in the lower plastic corresponding to the sealing ring, and a chamfer is formed in the buffer groove.

6. The secondary battery top cover according to claim 1, wherein the top cover piece is provided with a liquid injection hole therethrough, an explosion-proof valve is arranged on one side of the liquid injection hole, and an explosion-proof sheet is arranged on the top end of the explosion-proof valve.

7. The secondary battery top cap according to claim 1, wherein the fixing ring is uniformly provided with a plurality of circular holes therethrough.