High-reliability lithium battery cap

Abstract

The invention discloses a high-reliability lithium battery cap, which comprises an upper cover (1), a pore plate (4), a seal ring (2), an insulating spacer (3), a spring (5), an electric conductor (6) and an explosion-proof body (7), wherein the high-reliability lithium battery cap is characterized in that the explosion-proof body (7) is connected with the upper cover (1) through the spring (5); the electric conductor (6) is arranged on the upper cover (1) and the pore plate (4); the electric conductor (6) and the explosion-proof body (7) form a battery switch; and the pore plate (4) is connected with the insulating spacer (3). The high-reliability lithium battery cap has the advantages that the internal pressure of a battery can be accurately judged, the pressure can be timely released and exhausting can be repeated. Furthermore, the improved cap is provided with the switch and can be powered off and powered on, so that the utilization rate is high, scrapping of the battery caused by a fault can be well prevented and the cost is reduced.

Description

[0001] 【Technical field】 [0002] The invention relates to a cap structure of a lithium-ion battery, in particular to a high-reliability lithium battery cap. [0003] 【Background technique】 [0004] At present, cylindrical lithium batteries are developing towards high rate and high energy density, but safety performance has become an obstacle restricting their widespread use. In the case of high-rate charging and discharging, overcharging, abuse, etc., the temperature of the battery rises, and the electrolyte decomposes to generate gas. With the increase of gas, the internal pressure of the battery increases, and when it reaches a certain value, it will cause an explosion and cause safety problems. [0005] In order to prevent safety accidents caused by excessive internal pressure and battery explosion, the cap of the lithium battery is designed with a safety valve, the tabs are welded on the orifice plate, and the orifice plate is welded on the explosion-proof sheet. Disconne...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned structure controls the internal pressure of the battery through the solder joint strength of the orifice plate and the explosion-proof plate, and the explosion-proof line, and operates with the change of the internal pressure of the battery. This action is very unreliable and cannot accurately determine the internal pressure of the battery.

There are many factors affecting the strength of solder joints and the internal pressure of the explosion-proof line control, and there is no stable data or formula as a basis, so this structure is not reliable for judging the internal pressure of the battery. failure, this one-time feature increases the cost of

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