US 12,176,567 B2
Sealed battery
Takahiro Nogami, Osaka (JP); Masayoshi Yoshida, Osaka (JP); Oose Okutani, Hyogo (JP); and Akira Takano, Osaka (JP)
Assigned to PANASONIC ENERGY CO., LTD., Osaka (JP)
Appl. No. 17/311,834
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Nov. 13, 2019, PCT No. PCT/JP2019/044541
§ 371(c)(1), (2) Date Jun. 8, 2021,
PCT Pub. No. WO2020/129480, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-239241 (JP), filed on Dec. 21, 2018.
Prior Publication US 2022/0021072 A1, Jan. 20, 2022
Int. Cl. H01M 50/342 (2021.01); H01M 50/152 (2021.01); H01M 50/531 (2021.01)
CPC H01M 50/3425 (2021.01) [H01M 50/152 (2021.01); H01M 50/531 (2021.01)] 7 Claims
OG exemplary drawing
 
1. A sealed battery, comprising:
a battery case including a bottomed tubular exterior can and a sealing assembly sealing an opening of the exterior can; and
an electrode assembly housed in the battery case, wherein
the sealing assembly includes a metal plate,
the metal plate includes
a projection expanding toward the outside of the battery case, and
a flange part formed around the projection,
the projection includes an inclined part inclined so as to be gradually apart from the electrode assembly as going toward an inside from an outside of the sealing assembly in a radial direction, and
a thin part that has a smaller thickness than the flange part and takes priority in fracturing when an internal pressure of the battery case exceeds a predetermined threshold is formed in at least part of the inclined part,
wherein the smaller thickness of the thin part is less than a thickness at a boundary between the inclined part and the flange part, and
the projection includes a flat top part enclosed by the inclined part, wherein the inclined part forms an obtuse angle with respect to the flat top part.