US 12,463,254 B2
Solid state battery
Ryuto Sakamoto, Okazaki (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Mar. 4, 2022, as Appl. No. 17/686,959.
Claims priority of application No. 2021-041075 (JP), filed on Mar. 15, 2021.
Prior Publication US 2022/0294019 A1, Sep. 15, 2022
Int. Cl. H01M 10/0585 (2010.01); H01M 4/02 (2006.01); H01M 4/38 (2006.01); H01M 4/58 (2010.01)
CPC H01M 10/0585 (2013.01) [H01M 4/386 (2013.01); H01M 4/5825 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An all solid state battery comprising an electrode body A and an electrode body B connected in parallel and stacked along a thickness direction;
the electrode body A includes
a first current collector A,
a first active material layer A1, a solid electrolyte layer A1, a second active material layer A1, and a second current collector A1, formed in this order from one surface side of the first current collector A, and
a first active material layer A2, a solid electrolyte layer A2, a second active material layer A2, and a second current collector A2, formed in this order from another surface side of the first current collector A;
the electrode body B is an electrode body wherein two unit cells are connected in series and stacked along the thickness direction;
each unit cell is a cell including a first current collector B, a first active material layer B, a solid electrolyte layer B, a second active material layer B, and a second current collector B, in this order;
as an anode active material, the electrode body A includes a Si based active material;
as an anode active material, the electrode body B includes an anode active material B having lower expansion/contraction than the Si based active material; and
a proportion of a capacity of the electrode body A with respect to a capacity of a total of the electrode body A and the electrode body B is 25% or more and 60% or less.