This commodity is in the shape of a rectangular block, with a stainless - steel shell, and is composed of positive and negative electrode plates, diaphragms, tabs, packaging films, electrolyte, etc. It is mainly used to form a lithium - ion rechargeable battery together with a charge - discharge protection circuit board and a metal or plastic shell, and is the main component of the battery. This commodity is not equipped with a charge - discharge protection circuit and cannot be charged or discharged.