US 12,119,439 B2
Energy storage device
Yudai Kawasoe, Kyoto (JP); and Kenta Nagamine, Kyoto (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 16/764,212
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Nov. 22, 2018, PCT No. PCT/EP2018/082214
§ 371(c)(1), (2) Date May 14, 2020,
PCT Pub. No. WO2019/105840, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-230906 (JP), filed on Nov. 30, 2017.
Prior Publication US 2020/0395578 A1, Dec. 17, 2020
Int. Cl. H01M 10/0525 (2010.01); H01M 10/0563 (2010.01); H01M 50/103 (2021.01)
CPC H01M 10/0525 (2013.01) [H01M 10/0563 (2013.01); H01M 50/103 (2021.01); H01M 2220/20 (2013.01); H01M 2300/002 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An energy storage device comprising: an electrode assembly including a negative electrode and a positive electrode that are stacked on each other with a separator interposed therebetween; a nonaqueous electrolyte containing a nonaqueous solvent; and a flat outer case housing the electrode assembly and the nonaqueous electrolyte, wherein the electrode assembly is disposed in the outer case in a compressed state so that the electrode assembly is pressurized in a direction of stack,
the energy storage device further comprises a pressing member that pressurizes the electrode assembly in the direction of stack,
a surface pressure acting on the outer case in the direction of stack is 100 kPa or more, the nonaqueous solvent contains a fluorinated cyclic carbonate, the nonaqueous electrolyte has an electric conductivity at 250 C of 0.75 S/m or more and 0.95 S/m or less, and the nonaqueous solvent further contains a linear carbonate.