US 12,191,514 B2
Power supply device and electric vehicle and power storage device using same, fastening member for power supply device, production method for power supply device, and production method for fastening member for power supply device
Go Yamashiro, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/441,328
Filed by SANYO Electric Co., Ltd., Osaka (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050462
§ 371(c)(1), (2) Date Sep. 21, 2021,
PCT Pub. No. WO2020/202669, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-066828 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0190421 A1, Jun. 16, 2022
Int. Cl. H01M 50/249 (2021.01); H01M 50/209 (2021.01); H01M 50/224 (2021.01); H01M 50/262 (2021.01)
CPC H01M 50/249 (2021.01) [H01M 50/209 (2021.01); H01M 50/224 (2021.01); H01M 50/262 (2021.01); H01M 2220/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A power supply device comprising:
a plurality of secondary battery cells each including a prismatic exterior can;
a pair of end plates covering both end surfaces of a battery stack body in which the plurality of secondary battery cells are stacked; and
a plurality of fastening members each containing metal and including a plate shape extending in a stack direction of the plurality of secondary battery cells, the plurality of fastening members being disposed on opposing side surfaces of the battery stack body to fasten the end plates to each other, wherein
each of the plurality of fastening members includes
fastening portions each including a first metal, the fastening portions each being fixed to a corresponding one of the end plates at both ends in a longer direction of the fastening member, and
an intermediate portion including a second metal different from the first metal, the intermediate portion coupling the fastening portions with each other,
the first metal is higher in strength than the second metal, and
the second metal is higher in stretchability than the first metal.