US 12,451,486 B2
Energy storage device and energy storage apparatus
Yuta Nakamura, Kyoto (JP); and Yohei Shibata, Kyoto (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 17/778,740
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Nov. 20, 2020, PCT No. PCT/JP2020/043408
§ 371(c)(1), (2) Date May 20, 2022,
PCT Pub. No. WO2021/100858, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-211061 (JP), filed on Nov. 22, 2019.
Prior Publication US 2023/0055952 A1, Feb. 23, 2023
Int. Cl. H01M 4/525 (2010.01); H01M 4/131 (2010.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [H01M 4/131 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] 1 Claim
OG exemplary drawing
 
1. An energy storage apparatus comprising a plurality of energy storage devices and a voltage controller, wherein each of the plurality of energy storage devices includes a positive electrode including a positive active material layer, a negative electrode, and a nonaqueous electrolyte,
the positive active material layer contains, as a positive active material, a lithium transition metal composite oxide containing cobalt, manganese, and nickel, and the positive active material layer contains boron and aluminum,
an atomic ratio of nickel to a total of cobalt, manganese, and nickel in the lithium transition metal composite oxide is 0.4 or more and less than 1.0, and
the voltage controller is configured to control the plurality of energy storage devices such that a maximum voltage width that is a difference between a charge upper limit voltage and a discharge lower limit voltage under normal usage is 1.1 V or less.