Separator for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorHidekazu Tamai
Life of this patent
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Abstract
A nonaqueous electrolyte secondary battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator and a nonaqueous electrolyte. The separator includes a porous resin sheet having at least a three-layer structure consisting of an A-layer, a B-layer, and a C-layer stacked in that order. The average thermal expansion coefficient of each of the A-layer and the C-layer at a temperature of 0° C. to 50° C. is 100 ppm/K or more less than the average thermal expansion coefficient of the B-layer at a temperature of 0° C. to 50° C.
Claims6
A separator for nonaqueous electrolyte secondary batteries, comprising a porous resin sheet having at least a three-layer structure consisting of an A-layer, a B-layer, and a C-layer stacked in that order,
- wherein the average thermal expansion coefficient of the A-layer at a temperature of 0° C. to 50° C. is 100 ppm/K or more less than the average thermal expansion coefficient of the B-layer at a temperature of 0° C. to 50° C. and the average thermal expansion coefficient of the C-layer at a temperature of 0° C. to 50° C. is 100 ppm/K or more less than the average thermal expansion coefficient of the B-layer at a temperature of 0° C. to 50° C.
Dependencies are inferred from the claim text.