Fiberglass battery separator is the separation between the battery body and electrolyte, which mainly plays the role of isolation, conductivity and increase the mechanical strength of the battery. Battery separator can not only improve the performance of the battery, but also improve the safety performance of the battery, to ensure the stable operation of the battery. Separator material is mainly fiberglass, its thickness is generally 0.18mm to 0.25mm. Fiberglass battery separator as an integral part of the battery, it plays an important role in the battery. Different types of battery separators have their own advantages and disadvantages and are suitable for different application scenarios. Choosing the right fiberglass battery separator material not only improves battery performance, but also reduces the probability of battery damage, thus increasing the service life and safety of the battery.