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Title:
SECONDARY BATTERY, BATTERY PACK, ELECTRONIC DEVICE, POWER TOOL, ELECTRICALLY POWERED AIRCRAFT, AND ELECTRIC VEHICLE
Document Type and Number:
WIPO Patent Application WO/2021/024942
Kind Code:
A1
Abstract:
Provided is a secondary battery in which: a positive electrode has, on a belt-like positive electrode foil, a coated part coated with a positive electrode active material layer and a part not coated with the positive electrode active material; a negative electrode has, on a belt-like negative electrode foil, a coated part coated with a negative electrode active material layer and a part not coated with the negative electrode active material; the part not coated with the positive electrode active material is joined to a positive electrode collector plate at one end face of a wound electrode body; the part not coated with the negative electrode active material is joined to a negative electrode collector plate at the other end face of the wound electrode body; the part not coated with the positive electrode active material and/or the part not coated with the negative electrode active material has a surface formed by being bent and folded toward a central axis of the wound structure so as to overlap; and the surface has a groove extending from an inner peripheral part toward an outer peripheral part of the wound electrode body, wherein the depth of the groove at the inner peripheral part is smaller than the depth of the groove at the outer peripheral part.

Inventors:
HAMAGUCHI KUNIAKI (JP)
Application Number:
PCT/JP2020/029450
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; H01M4/13; H01M4/66; H01M10/04; 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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