US 11,791,471 B2
Nonaqueous-electrolyte secondary battery and secondary battery module
Kaoru Inoue, Osaka (JP); Akihiro Taniguchi, Hyogo (JP); Hideki Sano, Hyogo (JP); Kouhei Tsuzuki, Hyogo (JP); and Hiroki Iguchi, Nagoya (JP)
Assigned to PANASONIC HOLDINGS CORPORATION, Kadoma (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by Panasonic Corporation, Kadoma (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Feb. 9, 2021, as Appl. No. 17/171,445.
Claims priority of application No. 2020-021651 (JP), filed on Feb. 12, 2020.
Prior Publication US 2021/0249662 A1, Aug. 12, 2021
Int. Cl. H01M 4/66 (2006.01); H01M 4/36 (2006.01); H01M 4/13 (2010.01); H01M 50/46 (2021.01); H01M 50/471 (2021.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 4/131 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/661 (2013.01) [H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 10/0525 (2013.01); H01M 50/46 (2021.01); H01M 50/471 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A secondary battery module comprising: at least one nonaqueous-electrolyte secondary battery, and an elastic body that is placed with the nonaqueous-electrolyte secondary battery and receives a load from the nonaqueous-electrolyte secondary battery in a placement direction of the elastic body,
wherein the nonaqueous-electrolyte secondary battery includes an electrode body in which a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode are stacked, and a housing accommodating the electrode body,
the negative electrode includes a negative-electrode current collector, and a negative-electrode active material layer that is formed on the negative-electrode current collector and contains graphite particles as a negative-electrode active material, the negative-electrode active material layer including a first layer formed on the negative-electrode current collector, and a second layer that is formed on the first layer and has a higher compression modulus than the first layer,
the separator has a lower compression modulus than the first layer,
the elastic body has a lower compression modulus than the separator,
the graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m2/g,
the first layer contains 0.01 mass % to 0.4 mass % of a carbon nanotube having one to five graphene sheets,
the negative-electrode active material layer contains silicon oxide (SiOx) and a content of the silicon oxide is 1 mass % to 6 mass % relative to the negative-electrode active material layer, and
a content of Si particles in the silicon oxide (SiOx) is 35 mass % to 75 mass %.