Title:
SECONDARY BATTERY, ELECTRONIC DEVICE, AND ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2021/177149
Kind Code:
A1
Abstract:
Positive electrode active substance uncoated sections are joined to a positive electrode current collector plate in one end section of an electrode winding body. A negative electrode active substance uncoated section is joined to a negative electrode current collector plate in the other end section of the electrode winding body. The electrode winding body has: a flat surface formed by at least the positive electrode active substance uncoated sections bending towards the central axis of a structure upon which they are wound and overlapping; a groove formed in the flat surface; and an inner circumferential section comprising only a separator and positioned further on the inside than the innermost circumference of the positive electrode and negative electrode. The length E of a section of the positive electrode active substance uncoated sections that protrude from one end of the separator in the thickness direction is greater than the length F of a section of the separator that protrudes from one end of the negative electrode in the width direction. The secondary battery fulfills formula (1) when the number of separator layers in the inner circumferential section is m, the thickness is t, and Z = t × m. Formula (1): 80 ≤ Z ≤ 196 Fig. 5
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Inventors:
OTANI AKIRA (JP)
Application Number:
PCT/JP2021/007248
Publication Date:
September 10, 2021
Filing Date:
February 26, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01M4/02; H01M4/13; H01M4/64; H01M10/04; H01M10/052; H01M10/0587; H01M50/528; H01M50/531
Foreign References:
| JP2000260417A | 2000-09-22 | |||
| JP2008539559A | 2008-11-13 | |||
| JP2006004729A | 2006-01-05 | |||
| JP2002075319A | 2002-03-15 |
Attorney, Agent or Firm:
SUGIURA, Takuma et al. (JP)
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