Battery cell air bag and flexible package lithium ion battery

The utility model discloses a cell air bag and a flexible package lithium ion battery, the cell air bag comprises an aluminum plastic film, a folding part and an adjusting part, the aluminum plastic film has a first surface and a second surface opposite to each other, the folding part is a pit protruding from the second surface to the first surface, and a symmetry axis of the pit is parallel to a center line of the aluminum plastic film; on the center line, the area, without the pits, of the aluminum plastic film is an adjusting part, and the folding part is sequentially connected with the adjusting part. The folding part and the adjusting part are arranged on the aluminum-plastic film, and the folding part is a pit formed in the aluminum-plastic film and is equivalent to a pre-folding mark during folding. During application, the aluminum plastic film is pre-folded along the concave pit, if the concave pit deviates from the center line during folding, the relative position of the aluminum plastic film on the