Polymer battery is a polymer lithium-ion battery, which is a kind of lithium-ion battery. The advantages of polymer lithium-ion battery are summarized as follows:
1. the capacity density is large, and its capacity density is 1.5-2.5 times of that of Ni h battery or Ni Cd battery, or higher;
2. the self discharge is small, and its capacity loss is also small after a long time;
3. long life, and its cycle life can reach more than 500 times in normal use;