Ultra-thin dynamic combined cap for lithium battery

Abstract

The invention relates to the technical field of lithium battery assemblies, in particular to an ultra-thin dynamic combined cap for a lithium battery. The ultra-thin dynamic combined cap comprises a top cover, an explosion-proof plate, a spacing ring, a connecting plate and a sealing ring, wherein the explosion-proof plate is arranged below the top cover; the connecting plate is arranged below the explosion-proof plate; a covered edge which is rolled up inwards is arranged on the edge of the explosion-proof plate; the covered edge wraps the edge of the top cover; the explosion-proof plate is fixedly connected with the middle part of the connecting plate; the spacing ring is arranged between the edge of the connecting plate and the explosion-proof plate; and the sealing ring sleeves the outside of the top cover, the explosion-proof plate, the spacing ring and the connecting plate. According to the ultra-thin dynamic combined cap for the lithium battery provided by the invention, the height of the cap can be reduced to below 3mm; the height of an internal space of the battery is increased; the height of a roll core of the lithium battery can be increased by about 1mm; and the energy density of the battery is effectively improved. The structures of the spacing ring, the explosion-proof plate and the connecting plate are changed, so that the target of reducing the overall height of the cap is achieved; ultra-thinning of the cap is achieved; the ultra-thin dynamic combined cap is high in shock resistance and reliable in application; and massive automatic production is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium battery components, in particular to an ultra-thin power combination cap for lithium batteries. Background technique [0002] The emergence of batteries provides an important power supply guarantee for our human life, entertainment and work. With the development of society and the progress of human civilization, primary batteries will gradually be eliminated due to their environmental pollution, low capacity, and short service life, and replaced by secondary batteries with advantages such as no pollution, large capacity, and long service life. Among them, the unique structure and performance of cylindrical lithium batteries are widely used in various fields, such as notebook computers, mobile power supplies, power tools, electric vehicles, etc. are the representatives. [0003] The safety combination cap is the most important safety guarantee component of the lithium battery, and its own structur...

AI Technical Summary

Problems solved by technology

Existing combination caps such as Figure 9 As shown, including the external sealing ring, connection piece, isolation ring, explosion-proof disk, inner ring and top cover, the height h1 from the top cover to the bottom of the connection piece is about 3.5mm, which is the height of the cap. The thicker the thickness, the greater the capacity of the battery. The smaller it is, so the technicians have adopted a variety of solutions to reduce its thickness, such as reducing the height of the top cover, which is prone to two problems. One is that the top cover is lower than the edge of the battery table, which will affect the normal use of the battery. Affect the opening of the safety valve in the battery, or even fail to open; another example is to make the explosion-proof disc short, but because the explosion-proof disc is too low, the safety distance will not be enough, resulting in the explosion-proof disc and the connecting piece after being cut off. situation, resulting in incomplete power failure of the battery

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