Insulation film...? What type of insulation film is the poster talking about? Is it the separator between the pole pieces or the housing film on the outside of the battery? negative poles and prevents the battery from short-circuiting. A membrane which has the following characteristics: (1) It has electronic insulation, providing mechanical isolation of the positive and negative electrodes. (2) It has a certain pore size and porosity, ensuring low porosity; strength and high ionic conductivity, and is resistant to lithium ions. It has good permeability; (3) Since the electrolyte solvent is a highly polar organic compound, the separator should be resistant to electrolyte corrosion and have sufficient chemical and electrochemical stability; (4) It has good wettability for the electrolyte and it has sufficient liquid absorption and hydration capacity; (5) It has mechanical propertiessufficient strength, including puncture resistance, tensile strength, etc., but the thickness is as small as possible; ) It has good spatial stability and flatness; (7) Thermal stability and automatic shutdown protection performance are good.
If the poster talks about the casing film on the outside of the battery, it's relatively simple. It is usually a PVC or PET heat shrink film whose main purpose is to protect and prevent leakage of positive and negative electrodes. from being damaged by external conductive materials. The positive and negative conductors are short-circuited.
I hope the answer can be useful to you!