brief introduction Lithium polymer battery (also known as polymer lithium battery): compared with previous batteries, it is a chemical battery with high energy, miniaturization and lightweight. In terms of shape, lithium polymer batteries have the feature of ultra-thin, which can be used to make batteries with different shapes and capacities to meet the needs of some products. In theory, the small thickness of this type of battery can reach 0.5mm. At present, there are two types of lithium-ion batteries: liquid lithium-ion batteries (LIB) and lithium polymer batteries (PLIB).