Title:
円筒形電池
Document Type and Number:
Japanese Patent JP7403481
Kind Code:
B2
Abstract:
The purpose of the present disclosure is to maintain a stable state of contact between the outer circumferential surface of an electrode body and the inner surface of an exterior can, thereby reducing a variation in the internal resistance value. A cylindrical battery, as one example according to an embodiment of the present disclosure, is provided with: an electrode body formed by spirally winding a positive electrode and a negative electrode with a separator interposed therebetween; and a bottomed cylindrical exterior can for accommodating the electrode body. The negative electrode has a negative-electrode core body and a negative-electrode mixture layer provided on a surface of the negative-electrode core body. An exposed area in which the surface of the negative-electrode core body is exposed is formed on an outer circumferential surface of the electrode body, and the exposed area is in contact with the inner surface of the exterior can. The negative-electrode mixture layer contains, as a negative-electrode active material, graphite particles having an internal porosity of 5% or less and a fracture strength of 25-55 MPa.
Inventors:
Naoya Morisawa
Shinpei Yamagami
Takamitsu Tage
Bunichi Mizukoshi
Shinpei Yamagami
Takamitsu Tage
Bunichi Mizukoshi
Application Number:
JP2020571239A
Publication Date:
December 22, 2023
Filing Date:
February 05, 2020
Export Citation:
Assignee:
Panasonic Energy Co., Ltd.
Panasonic Holdings Co., Ltd.
Panasonic Holdings Co., Ltd.
International Classes:
H01M10/0587; H01M4/133; H01M4/587
Domestic Patent References:
| JP2014102877A | ||||
| JP2013134938A | ||||
| JP2011060465A |
Foreign References:
| WO2012077653A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation YKI International Patent Office
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