Cylindrical battery and cap assembly thereof

Abstract

The invention discloses a cylindrical battery and a cap assembly thereof, and the cap assembly of the cylindrical battery comprises: a first cap; a second cap; the polarity of the first cover cap is opposite to that of the second cover cap, the first cover cap and the second cover cap are insulated through the insulating part and form an integral structure, and a reinforcing structure is arranged between the first cover cap and / or the second cover cap and the insulating part; the cap assembly can have different polarities effectively, pole columns do not need to be machined on the cap assembly, the procedure that an existing cap assembly needs to machine the pole columns is omitted, cost is saved, meanwhile, the reinforcing structure is arranged and used for improving the bonding strength between the first cap and / or the second cap and the insulating part, and therefore the bonding strength of the first cap and / or the second cap and the insulating part is improved. Therefore, the situation that the insulating part falls off between the first cap and the second cap to cause air leakage of the battery is prevented, and the air tightness effect of the battery is guaranteed.

Description

technical field [0001] The invention relates to the technical field of batteries and battery manufacturing, in particular to a cylindrical battery and a cap assembly thereof. Background technique [0002] Lithium batteries refer to batteries containing lithium (including metal lithium, lithium alloys, lithium ions, and lithium polymers) in an electrochemical system. Lithium batteries have the advantages of small size, large capacity, long service life, low self-discharge rate, no memory effect, and green environmental protection. They are currently widely used in commercial vehicles, special vehicles, electric bicycles, energy storage systems, medical equipment, etc. [0003] When the top cover of the existing battery is combined with the injection molded part to achieve insulation and sealing, due to the different materials of the top cover and the injection molded part, poor air tightness is likely to occur, resulting in poor battery sealing effect. SUMMARY OF THE INVENT...

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is to provide a cap assembly for a cylindrical battery, which solves the problem that the top cap in the prior art is provided with a pole, and an insulating member is arranged between the pole and the top cap. The technical problem in the case of poor airtightness of the pole has realized the improvement of the bonding force between the first cap, the second cap and the insulator, and ensured that the connection between the first cap, the second cap and the insulator has good airtightness

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