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release time:2023-09-04
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Lithium ion batteries generally have four major components in structure: positive electrode, negative electrode, electrolyte, separator, and shell. The interior of the battery adopts a spiral wound structure, which is separated by a very fine and highly permeable polyethylene film isolation material between the positive and negative electrodes. Before the emergence of polymer batteries, lithium batteries mostly used liquid lithium batteries represented by 18650. However, after the emergence of thinning requirements in the market, the existing market of 18650 was gradually eroded.
Compared with liquid lithium-ion batteries, polymer lithium-ion batteries have advantages such as thinness, arbitrary area and shape, and do not pose safety issues such as liquid leakage and combustion explosion. Therefore, the shell material can be lighter, which can improve the specific capacity of the entire battery.
Currently, polymer batteries replace 18650 and 16650 in laptops, and square batteries in smartphones. From the perspective of product design and production, polymers have the greatest design flexibility and can be customized according to the design requirements of end products, including the production of special-shaped batteries, fully utilizing product space, and their production automation level is also constantly improving.
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