Sealing device for protecting terminal posts of power lithium ion battery from weeping

Abstract

Provided is a sealing device for protecting terminal posts of a power lithium ion battery from weeping. The sealing device comprises lower terminal posts 1, battery covers 2, sealing rings 3, sealing rings 4, fixing nuts 5, upper terminal posts 6, sheet metals 7 and brim-shaped structures 8. The invention is characterized in that: each terminal post comprises an upper terminal post 6 and a lower terminal post 1; the lower terminal post 1 is a cuboid with two circular holes; the upper part of the cuboid is a lamellar square sheet metal, a hollow screw is fixed above the sheet metal, and the outwardly projecting brim-shaped structure with a length of 2 to 4 mm is arranged 3 mm far from the sheet metal. The sealing rings 3 and 4 are respectively arranged above and below the brim-shaped structure; the lower terminal posts and battery covers are fixed together by moulding, and the lower terminal posts are further fixed by the nuts 5 above the battery covers after passing through the battery covers; the upper terminal posts sequentially pass through spring washers and plain washers and are screwed into the lower terminal posts.

Description

technical field [0001] The invention relates to a sealing device, in particular to a liquid leakage prevention device for a power lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in communications, power tools, and energy storage equipment because of their high specific energy, long cycle life, low self-discharge rate, no pollution, and good safety. In recent years, in order to meet the electricity demand of electric cars and electric buses, people have begun to research and produce high-power lithium-ion batteries with lithium iron phosphate as the cathode material. Although lithium-ion batteries are constantly developing toward high capacity and high power, the sealing technology between the pole and the battery cover has not been solved, so that it has become a resistance to the rapid development of lithium-ion batteries. Some people have tried to use glass and ceramics to complete the sealing between the battery pole and the batte...

AI Technical Summary

Problems solved by technology

At present, most of the large-capacity lithium iron phosphate batteries are sealed by adding glue to the electrodes, sealing rings, and battery covers and then compressing them. However, because the electrolyte of lithium-ion batteries is carbonates, such as ethylene carbonate, methyl carbonate, Dimethyl carbonate, this type of electrolyte has a strong ability to dissolve organic polymer glue, and it is easy to melt the sealant and cause battery leakage

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