| 摘要 |
PROBLEM TO BE SOLVED: To obstruct the generation of breakage of a polymer electrolyte layer in manufacturing of a secondary battery and enhance the energy density of the secondary battery. SOLUTION: A polymer electrolyte layer 17 is interposed between a positive active material layer 13 of a positive sheet 11 and a negative active material layer 16 of a negative sheet 14, and the positive sheet and the negative sheet are stacked. A laminate 20 is folded back once or two or more times in zigzag to form a lithium polymer secondary battery. A negative current collector foil 15, the positive active material layer, the polymer electrolyte layer, and a positive current collector foil are folded back in a belt, with no disconnection, and the positive active material layer is formed on a positive current collector foil so that the folded part of the positive current collector foil is divided with a positive slit 28. |
