	US 12,463,235 B2
	Cylindrical battery
Shuji Sugimoto, Hyogo (JP); Takahiro Fukuoka, Tokushima (JP); Kazuhiko Watanabe, Osaka (JP); and Toshihiko Mori, Shiga (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP)
Appl. No. 17/798,199
Filed by SANYO Electric Co., Ltd., Kadoma (JP)
PCT Filed Feb. 2, 2021, PCT No. PCT/JP2021/003703 § 371(c)(1), (2) Date Aug. 8, 2022, PCT Pub. No. WO2021/166631, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2020-026265 (JP), filed on Feb. 19, 2020.
Prior Publication US 2023/0090756 A1, Mar. 23, 2023
Int. Cl. H01M 50/107 (2021.01); H01M 10/04 (2006.01); H01M 50/179 (2021.01); H01M 50/186 (2021.01); H01M 50/342 (2021.01); H01M 50/46 (2021.01); H01M 50/559 (2021.01); H01M 50/562 (2021.01)

CPC H01M 10/0422 (2013.01) [H01M 50/107 (2021.01); H01M 50/179 (2021.01); H01M 50/186 (2021.01); H01M 50/3425 (2021.01); H01M 50/46 (2021.01); H01M 50/559 (2021.01); H01M 50/562 (2021.01)]

10 Claims

1. A cylindrical battery, comprising:

an electrode assembly in which a positive electrode plate and a negative electrode plate are wound with a separator interposed between the positive electrode plate and the negative electrode plate;

an electrolyte;

a bottomed cylindrical exterior housing can that houses the electrode assembly and the electrolyte; and

a sealing assembly that seals an opening of the exterior housing can,

wherein the sealing assembly includes a rupture disk that is fixed by crimping to the opening of the exterior housing can with a gasket interposed between the exterior housing can and the rupture disk, and an external terminal that is not fixed by crimping to the opening of the exterior housing can,

the rupture disk has a vent part that ruptures when an internal pressure of the battery increases,

the external terminal is fixed to an upper face part of the vent part, and

the external terminal has a recess which is a recessed upper face part at a substantially central part, and in the recess, the external terminal and the vent part are welded to each other.