| 摘要 |
PROBLEM TO BE SOLVED: To make extremely thin an insulated coat for improving battery capacity, and reduce the deterioration of battery performance under high temperature by fixing the insulated coat, composed of an aggregate of insulating material particles, to a surface on a side wherein the active material of the current collecting foil of positive and negative electrodes is not formed covered. SOLUTION: A positive electrode active material dispersion is applied to one side surface of a current-collecting body foil 4a of a positive electrode plate 4 to be dried, and is formed covered of a positive electrode active material layer 4b. Negative electrode active material slurry is applied to one side surface of a current-collecting body layer 5a of a negative electrode plate 5 to be dried, and is formed covered of a negative electrode active material layer 5b. Then, an α-Al2 O3 fine powder and polyvinylidene fluoride powder are mixed, and N-methyl pyrrolidone is added to form dispersion by further mixing thereto. The dispersion is applied uniformly to the surface of the current collecting body foil 4a and 4b on a side (where the active materials of the positive and negative electrodes 4 and 5 are not formed covered), and is dried, and an insulated coat 7, composed of an insulation material particle aggregate, is fixed thereto. Separators 6 are nippedly wound on the positive and negative electrodes 4 and 5, thereto the insulated coat 7 is fixed, to obtain an electrode laminating layer body 1 composed of a unit battery layer 3. |
