US 12,444,790 B2
Electricity storage device
Shinya Geshi, Osaka (JP); and Yoshiyuki Okamura, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/904,193
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 19, 2021, PCT No. PCT/JP2021/006495
§ 371(c)(1), (2) Date Aug. 12, 2022,
PCT Pub. No. WO2021/172235, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-034473 (JP), filed on Feb. 28, 2020.
Prior Publication US 2023/0065382 A1, Mar. 2, 2023
Int. Cl. H01M 50/107 (2021.01); H01M 50/186 (2021.01); H01M 50/566 (2021.01)
CPC H01M 50/107 (2021.01) [H01M 50/186 (2021.01); H01M 50/566 (2021.01); H01M 2220/20 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An electricity storage device comprising:
an electrode group including a first electrode and a second electrode;
a case accommodating the electrode group therein, the case having an opening provided therein; and
a sealing body covering the opening of the case, wherein
the case includes a tubular part, a curved part connected to one end of the tubular part, and a bottom part closing another end of the tubular part,
the curved part includes an opening rim, a crimp part connected to the opening rim, and a groove part connected to the crimp part, the crimp part being located outward from the opening rim along a radial direction of the tubular part, the groove part being recessed to protrude inward in the radial direction of the tubular part and having an annular shape,
the sealing body includes:
a sealing plate having conductivity; and
a gasket having electric insulation, the gasket being compressed between the sealing plate and a portion of the crimp part facing the groove part and between the sealing plate and an inner surface of the groove part,
the case is electrically connected to the first electrode,
the sealing plate is electrically connected to the second electrode,
the opening rim does not contact the gasket,
the curved part includes a first bending portion at a boundary between the opening rim and the crimp part, the first bending portion being directed to a direction opposite to a bending direction of the crimp part,
the curved part further includes a second bending portion between the first bending portion and a tip of the opening rim, the second bending portion being directed to a direction same as the bending direction of the crimp part, and
the second bending portion does not contact the gasket.
 
5. An electricity storage device comprising:
an electrode group including a first electrode and a second electrode;
a case accommodating the electrode group therein, the case having an opening provided therein; and
a sealing body covering the opening of the case, wherein:
the case includes a tubular part, a curved part connected to one end of the tubular part, and a bottom part closing another end of the tubular part,
the curved part includes an opening rim, a crimp part connected to the opening rim, and a groove part connected to the crimp part, the crimp part being located outward from the opening rim along a radial direction of the tubular part, the groove part being recessed to protrude inward in the radial direction of the tubular part and having an annular shape,
the sealing body includes:
a sealing plate having conductivity; and
a gasket having electric insulation, the gasket being compressed between the sealing plate and a portion of the crimp part facing the groove part and between the sealing plate and an inner surface of the groove part,
the case is electrically connected to the first electrode,
the sealing plate is electrically connected to the second electrode,
the opening rim does not contact the gasket,
a first collector lead having a same polarity as the first electrode is welded to an outer surface of the opening rim which does not contact the gasket, and
a second collector lead having a same polarity as the second electrode is welded to an outer surface of the sealing plate.