US 12,244,027 B2
Sealing gasket and tubular battery incorporating sealing gasket
Tatsuya Yamazaki, Tokyo (JP); and Shigeyuki Kuniya, Tokyo (JP)
Assigned to FDK CORPORATION, Tokyo (JP)
Filed by FDK CORPORATION, Tokyo (JP)
Filed on Jul. 14, 2021, as Appl. No. 17/374,993.
Application 17/374,993 is a continuation of application No. PCT/JP2019/050912, filed on Dec. 25, 2019.
Claims priority of application No. 2019-011488 (JP), filed on Jan. 25, 2019.
Prior Publication US 2021/0344069 A1, Nov. 4, 2021
Int. Cl. H01M 50/171 (2021.01); H01M 6/02 (2006.01); H01M 50/152 (2021.01); H01M 50/184 (2021.01); H01M 50/186 (2021.01); H01M 50/193 (2021.01); H01M 50/198 (2021.01)
CPC H01M 50/171 (2021.01) [H01M 6/02 (2013.01); H01M 50/152 (2021.01); H01M 50/184 (2021.01); H01M 50/186 (2021.01); H01M 50/193 (2021.01); H01M 50/198 (2021.01)] 3 Claims
OG exemplary drawing
 
1. A sealing gasket for a tubular battery, the sealing gasket comprising:
a disc-shaped partition portion;
an outer peripheral portion provided to stand from a peripheral edge of the partition portion and held between an open end of a metal battery can and a dish-shaped metal sealing plate; and
a plurality of stress buffer portions formed of annular grooves formed concentrically in the partition portion,
the tubular battery including
the metal battery can having a bottomed tubular shape and has the open end subjected to inward diameter reduction,
a power generation element housed in the metal battery can,
the dish-shaped metal sealing plate fitted and attached to the open end subjected to the inward diameter reduction, and
the sealing gasket, made of resin and held between the open end and the sealing plate,
wherein Ha/H, a ratio of a thickness Ha of a region of the partition portion in which the plurality of stress buffer portions are formed to an overall height H from a lowest position to a highest position of the sealing gasket, is 15% or more and 30% or less,
the plurality of stress buffer portions are offset from each other and formed alternately on opposite surfaces of the partition portion,
the annular grooves that form the stress buffer portions are formed within the thickness Ha of the partition portion,
a depth of the annular grooves that form the plurality of stress buffer portions is determined by the thickness Ha and is the same for all the stress buffer portions, and
a thickness of bottoms of the annular grooves that form the plurality of stress buffer portions is the same for all the stress buffer portions.