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Patent Searching and Data


Title:
SECONDARY BATTERY, BATTERY PACK, ELECTRONIC DEVICE, ELECTRIC POWER TOOL, ELECTRIC-POWERED AIRCRAFT, AND ELECTRIC-POWERED VEHICLE
Document Type and Number:
WIPO Patent Application WO/2021/024940
Kind Code:
A1
Abstract:
Provided is a secondary battery, wherein a positive electrode has, on belt-shaped positive electrode foil, a coated part coated with a positive electrode active material layer, and a positive electrode active material-uncoated part, a negative electrode has, on belt-shaped negative electrode foil, a coated part coated with a negative electrode active material layer, and a negative electrode active material-uncoated part, the positive electrode active material-uncoated part is joined to a positive electrode collector plate at one end surface of an electrode-wound body, the negative electrode active material-uncoated part is joined to a negative electrode collector plate at the other end surface of the electrode-wound body, the positive electrode active material-uncoated part and/or the negative electrode active material-uncoated part has a flat surface formed by bending toward the central axis of a wound structure and overlapping, the flat surface has grooves extending from an inner peripheral part to an outer peripheral part of the electrode-wound body, and the width (W1) of the groove in the inner peripheral part is smaller than the width (W2) of the groove in the outer peripheral part. FIG. 6

Inventors:
MUROI YUSUKE (JP)
Application Number:
PCT/JP2020/029444
Publication Date:
February 11, 2021
Filing Date:
July 31, 2020
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01M10/0587; H01M4/02; H01M4/13; H01M4/66; H01M10/04; H01M10/052; H01M50/531
Foreign References:
JP2001068379A2001-03-16
JP2015106614A2015-06-08
JP2015106613A2015-06-08
JPS471520A
KR20060022358A2006-03-10
US20120171535A12012-07-05
JP2001028274A2001-01-30
Attorney, Agent or Firm:
SUGIURA, Takuma et al. (JP)
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