Anti-explosion cover cap assembly of power lithium battery

Abstract

The invention discloses an anti-explosion cover cap assembly of a power lithium battery. The anti-explosion cover cap assembly consists of a top cover, an anti-explosion sheet, an insulating ring, a pore plate and a sealing ring from the top to bottom in sequence; a plurality of convex laser welding lines are arranged on the upper end plane of the top cover; and the laser welding lines are used for enabling the anti-explosion sheet and the top cover to be welded. The top cover and the anti-explosion sheet are welded through the laser welding lines, without needing an edge wrapping structure, so that an edge wrapping process is omitted and secondary damage to the anti-explosion sheet caused by the edge wrapping process also can be avoided; in addition, the laser welding lines are relatively attractive in appearance and high in reliability, so that the safety can be further reinforced; and meanwhile, the overall height of the cover cap is lowered and the effective capacity of the battery is improved, so that the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of new energy, in particular to an explosion-proof cap assembly for a power lithium battery. Background technique [0002] The cap of the lithium battery is one of the key components of the power lithium battery. It bears the safety and reliability of the battery and directly affects the personal safety and property safety of production and life. [0003] Such as figure 1 , figure 2 As shown, the cap assembly of the prior art includes a top cover 10, an explosion-proof disk 20, an insulating ring 30, an orifice 40 and a sealing ring 50, wherein the top cover 10 and the explosion-proof disk 20 are welded to form a solder joint 101, and the welding At point 101, the edge of the top cover 10 is covered by the edge wrapping process with the explosion-proof disk 20 to form the wrapping structure 201, and then the two are connected together by welding with a welding machine. This increases the overall thickness of the c...

AI Technical Summary

Problems solved by technology

In this way, the overall thickness of the cap is increased, and the thickness value is more than 3.9 cm. Under the condition of a specific overall size of the battery, the battery energy storage cylinder is required to reduce the space, resulting in a short service life of the battery.

At the same time, the hemming process itself is relatively complicated, and the processing process will more or less cause damage to the explosion-proof disk 20, which makes the reliability of the explosion-proof disk 20 worse and brings hidden dangers to safety.

In addition, the explosion-proof plate 20 and the orifice plate 40 are also connected through the preset solder joints 401. Although this connection method is simple to weld, the consistency of power failure is poor, and it is easy to cause a short circuit, or even the possibility of deflagration or explosion. Production and life bring serious safety challenges

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