US 12,080,916 B2
Cylindrical battery
Naoya Morisawa, Hyogo (JP); Shimpei Yamagami, Osaka (JP); Takamitsu Tashita, Tokushima (JP); and Fumikazu Mizukoshi, Osaka (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP); and PANASONIC HOLDINGS CORPORATION, Osaka (JP)
Appl. No. 17/426,001
Filed by SANYO Electric Co., Ltd., Daito (JP); and Panasonic Corporation, Kadoma (JP)
PCT Filed Feb. 5, 2020, PCT No. PCT/JP2020/004405
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/162504, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-021656 (JP), filed on Feb. 8, 2019.
Prior Publication US 2022/0166115 A1, May 26, 2022
Int. Cl. H01M 50/528 (2021.01); H01M 4/02 (2006.01); H01M 4/62 (2006.01); H01M 10/0587 (2010.01); H01M 50/107 (2021.01)
CPC H01M 50/528 (2021.01) [H01M 4/625 (2013.01); H01M 10/0587 (2013.01); H01M 50/107 (2021.01); H01M 2004/027 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A cylindrical battery, comprising:
an electrode assembly having a positive electrode and a negative electrode wound into a spiral shape with a separator intervening therebetween; and
a bottomed cylindrical exterior can housing the electrode assembly, wherein
the negative electrode has a negative electrode core, and a negative electrode mixture layer provided on a surface of the negative electrode core,
an exposed part from which a surface of the negative electrode core is exposed is formed on an outer peripheral surface of the electrode assembly, and the exposed part is in contact with an inner surface of the exterior can, and
the negative electrode mixture layer includes, as a negative electrode active material, graphite particles having 5% or less of internal porosity and 25 MPa to 55 MPa of breaking strength.