Lithium polymer battery (also known as polymer lithium battery): it is a new type of battery with many obvious advantages, such as high energy density, miniaturization, ultra-thin, lightweight, high safety and low cost. In terms of shape, lithium polymer battery has ultra-thin characteristics, which can be made into batteries of any shape and capacity to meet the needs of various products. The minimum thickness that can be achieved by this kind of battery is 0.5mm. Lithium ion polymer batteries are generally named by 6-7 digits, which respectively represent thickness / width / height. For example, pl6567100 represents lithium ion polymer batteries with thickness of 6.5mm, width of 67mm and height of 100mm, in which PL represents that the battery belongs to polymer category. The manufacturing process of lithium ion polymer battery generally adopts laminated soft packaging, so the size change is very flexible and convenient, and there are relatively many models.