| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of heat when overcharging or overdischarging. SOLUTION: In this lithium ion polymer secondary battery, a positive electrode sheet 11 with a positive electrode active material 13 formed on the surface of positive electrode current collector foil 12, and a negative electrode sheet 14 with a negative electrode active material 16 formed on the surface of negative electrode current collector foil 15, are laminated interposing a polymer electrolyte layer 17 between the positive electrode active material of the positive electrode sheet 11 and the negative electrode active material of the negative electrode sheet 14. Film-like insulating members 18 are provided projecting from both side edges of the polymer electrolyte layer over the whole length of the side edges, and a part or the whole of the insulating member 18 is formed of a temperature sensitive member having a melting or softening point or a temperature of 80-180 deg.C to dissolved or softened in a battery internal constituent. The whole or part of the side edge of the positive electrode active material and the side edge of the negative electrode active material are laminated through the temperature sensitive member. The insulating member is formed of polyethylene, polypropylene or an ethylene-propylene copolymer, or a hexafluoropropylene-fluoride vinylidene copolymer. |
