Low resistance Li-ion battery cap

Abstract

The invention discloses a low-resistance lithium-ion battery cap, which includes a sealing ring. A top cover, an explosion-proof sheet and a hole plate are respectively packaged in the sealing ring from top to bottom. Laser welding point connection, the orifice plate is welded to the bottom of the explosion-proof plate, and an insulating sheath is arranged between the two, and the explosion-proof plate has a wrapping extending inwardly above the top cover, and the wrapping and the top cover The cover is tightly fitted, and there is a circle of dents on the inner side of the explosion-proof disc and the top cover, and a support step extends inward from the bottom of the sealing ring, and the orifice plate falls off the support step In addition, the above-mentioned low-resistance lithium-ion battery cap not only greatly reduces the internal resistance of the battery cap, but also has a simple structure, saves costs, and has high safety and reliability.

Description

technical field [0001] The invention relates to a battery cap, in particular to a low-resistance lithium-ion battery cap. Background technique [0002] With the development of the economy and the continuous improvement of people's living standards, portable mobile devices such as video cameras, digital cameras, and notebook computers have been more and more widely used, creating a good platform for the development of the battery industry. Lithium-ion Batteries, as one of many batteries, are increasingly favored by people because of their high energy density and various excellent performances. [0003] As we all know, lithium-ion batteries are composed of many parts. Among the many parts, the cap of lithium-ion batteries is one of the key parts of lithium-ion batteries. The quality of its design is related to the size, life and manufacturing cost of the battery's internal resistance. , with the application of lithium batteries becoming more and more extensive and in-depth, u...

AI Technical Summary

Problems solved by technology

When PTC was first used, the internal resistance was required to be less than 20mΩ; later, when the nickel ring was used, the internal resistance was required to be less than 5mΩ; and now it is generally required that the internal resistance is less than 0.5mΩ, and there are even requirements for less than 0.3mΩ, such low resistance requirements. , which is difficult to achieve with the existing cap structure

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