| abstract |
(57) [Problem] To provide a prismatic battery, a thick outer resin film has been used in terms of workability, but the thickness of the battery has been increased, resulting in a decrease in volume energy efficiency. SOLUTION: Only one of the side surfaces of the bare cell has a resin film overlap along the bare cell, and the portion is bonded by at least one of heat fusion, an adhesive or an adhesive, In addition, the resin film is given a shrinkage stress by bonding the side surface of the bare cell and the resin film or heating after the exterior. At this time, it is desirable that the adhesive strength be 400 dyn / cm or more, and it was effective to perform a corona discharge treatment or a plasma discharge treatment on the resin film surface. |