US 12,462,987 B2
Power storage device
Toshitaka Kobayashi, Osaka (JP); Hiroki Hayashi, Kyoto (JP); Eiko Ishii, Osaka (JP); Hideki Shimamoto, Kyoto (JP); and Ryota Morioka, Kyoto (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/260,316
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 20, 2021, PCT No. PCT/JP2021/047005
§ 371(c)(1), (2) Date Jul. 3, 2023,
PCT Pub. No. WO2022/163210, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 2021-014468 (JP), filed on Feb. 1, 2021.
Prior Publication US 2024/0170227 A1, May 23, 2024
Int. Cl. H01G 9/12 (2006.01); H01G 9/10 (2006.01); H01G 11/80 (2013.01); H01M 50/107 (2021.01)
CPC H01G 9/12 (2013.01) [H01G 9/10 (2013.01); H01G 11/80 (2013.01); H01M 50/107 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A power storage device comprising:
a power storage element;
a case that houses the power storage element, the case having a bottomed tubular shape and including an opening at one end of the case; and
a sealing body that seals the opening, the sealing body including an elastic resin, wherein:
the case includes a first pressing part and a second pressing part in a vicinity of the opening,
the first pressing part presses a side surface of the sealing body and protrudes to an inside of the case,
the second pressing part presses an upper surface of the sealing body,
the sealing body includes a slit on the upper surface of the sealing body,
the power storage element as a whole is disposed under the sealing body,
the slit extends radially inward of the case with respect to the second pressing part and opens at the side surface of the sealing body, and
the sealing body is configured to deform such that, by an increase in an internal pressure of the case, a gap is formed between the side surface of the sealing body and the inside of the case at the first pressing portion to allow a gas in the case to escape to an outside of the case through the gap, while maintaining a lower surface of the sealing body opposite to the upper surface being located below the first pressing portion.