A secondary battery includes an electrode wound body including a stacked structure wound around a central axis extending in a first direction. The stacked structure includes a positive electrode and a negative electrode that are stacked with a separator interposed therebetween. The separator includes a stacked part in which three or more bases are stacked. At least two of the three or more bases are folded back in a center region of the electrode wound body. The center region of the electrode wound body is a region located on an inner winding side relative to an inner winding side end part of a negative electrode current collector. In the electrode wound body, an inner winding side edge of the positive electrode, the negative electrode, and the stacked part overlap each other.
SECONDARY BATTERY, BATTERY PACK, ELECTRONIC EQUIPMENT, ELECTRIC TOOL, ELECTRIC AIRCRAFT, AND ELECTRIC VEHICLE
2024-12-05
Patent
Electronic Resource
English
European Patent Office | 2024
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