SECONDARY BATTERY, ELECTRONIC DEVICE, AND ELECTRIC TOOL

WIPO Patent Application WO/2022/153647

A1

Provided is a battery for high-rate discharging that does not cause internal short-circuiting, while improving battery capacity.　In this secondary battery, a negative electrode has, on a strip-shaped negative electrode foil, a negative electrode active material covered part covered by a negative electrode active material layer, a first negative electrode active material non-covered part that extends in a longitudinal direction of the negative electrode foil, a second negative electrode active material non-covered part provided at a winding start-side end in the longitudinal direction, and an insulating resin part provided between the negative electrode active material covered part and the first negative electrode active material non-covered part. A positive electrode active material non-covered part is joined to a positive electrode current collector plate at one end of an electrode wound body, and the first negative electrode active material non-covered part is joined to a negative electrode current collector plate at the other end of the electrode wound body. The electrode wound body has: a flat surface formed by bending one or both of the positive electrode active material non-covered part and the first negative electrode active material non-covered part toward the central axis of a wound structure and overlapping them with each other; and a groove formed in the flat surface.

TANAKA SATORU (JP)

PCT/JP2021/040358

July 21, 2022

November 02, 2021

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MURATA MANUFACTURING CO (JP)

H01M4/02; H01M10/04; H01M10/0587; H01M50/533; H01M50/538; H01M50/586; H01M50/591

WO2011001639A1

2011-01-06

JP2008166030A	2008-07-17
JP2001313079A	2001-11-09

SUGIURA PATENT OFFICE et al. (JP)

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