US 12,463,255 B2
Energy storage device, method for manufacturing energy storage device, and energy storage apparatus
Takeshi Sasaki, Kyoto (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 17/799,554
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Mar. 15, 2021, PCT No. PCT/JP2021/010300
§ 371(c)(1), (2) Date Aug. 12, 2022,
PCT Pub. No. WO2021/193184, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-050931 (JP), filed on Mar. 23, 2020.
Prior Publication US 2023/0055059 A1, Feb. 23, 2023
Int. Cl. H01M 10/0587 (2010.01); H01M 4/02 (2006.01)
CPC H01M 10/0587 (2013.01) [H01M 2004/021 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An energy storage device comprising:
an electrode assembly obtained by winding a band-shaped positive electrode including a positive active material layer, a band-shaped negative electrode including a negative active material layer, and a band-shaped separator in a longitudinal direction;
an electrolyte solution; and
a case that houses the electrode assembly and the electrolyte solution,
wherein at least one of the positive active material layer and the negative active material layer contains a hollow active material particle,
a winding axis of the electrode assembly is located parallel to a horizontal direction,
at least a central part of the electrode assembly is pressed with the case pressed,
an excess electrolyte solution that is a part of the electrolyte solution is present between the electrode assembly and the case,
a lower end of the electrode assembly has contact with the excess electrolyte solution, and
at least one of formulas 1 to 3 below is satisfied, where H, Wc, Wa, and Ws respectively represent a height from a liquid level of the excess electrolyte solution to an upper end of the electrode assembly, a width of the positive active material layer, a width of the negative active material layer, and a width of the separator:
0.8H≤Wc≤2.0H  1
0.9H≤Wa≤2.1H  2
1.0H≤Ws≤2.2H  3.