Sealed safe combined lithium battery cap

Abstract

The invention discloses a sealed safe combination lithium battery cap, which comprises a shell, wherein a clamping ring is inserted into the shell, a bottom cover is in threaded connection with the inner wall of the bottom end of the shell, a rubber pad is bonded to the inner wall of the bottom cover, a second sealing ring is bonded to the outer wall of the top of the bottom cover, a first sealingring, a cap top, a thermistor ring and an explosion-proof sheet which are sequentially distributed from top to bottom are inserted between the inner wall of the top of the clamping ring and the outerwall of the top of the second sealing ring, and a groove with an annular structure is formed in the concave position of the outer wall of the explosion-proof sheet. According to the invention, the electrolyte in the lithium battery is not easy to flow out; when any one of the first sealing ring and the second sealing ring is damaged, the other one can play sealing role normally, so that the sealing effect of the lithium battery can be enhanced; and when the pressure in the battery is increased and the temperature is increased, the resistance of the thermistor ring is increased in a step manner, and then the circulation of current in the battery is blocked, so that the safety of the lithium battery in use is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a sealed safety combined lithium battery cap. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Lithium-ion batteries have gained a lot of attention because of their high specific energy, high specific power, long cycle life, and no toxic substances. increasingly widespread applications. [0003] At present, when the internal voltage of the existing lithium battery is too high, the explosion-proof plate will deform and squeeze the sealing ring, resulting in deformation and damage of the sealing ring, which in turn will cause the electrolyte in the lithium battery to leak, resulting in the lithium battery not being used normally, which will endanger The health and safety of users, therefore, urgently need to design a kind of sealed sa...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that the current of the existing lithium battery is too large so that the short circuit of the lithium battery and the deformation of the explosion-proof plate cause the damage of the sealing ring, and propose a sealed safety combined lithium battery cap

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