US 11,811,050 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, Osaka (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by Panasonic Corporation, Kadoma (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Feb. 11, 2021, as Appl. No. 17/173,736.
Claims priority of application No. 2020-021759 (JP), filed on Feb. 12, 2020.
Prior Publication US 2021/0249646 A1, Aug. 12, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/587 (2010.01); H01M 50/46 (2021.01); H01M 4/38 (2006.01); H01M 50/471 (2021.01); H01M 4/58 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/133 (2013.01) [H01M 4/134 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 50/46 (2021.01); H01M 50/471 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 7 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 negative-electrode active material particles, 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 negative-electrode active material particles contained in the first layer include graphite particles and at least one Si particle selected from the group consisting of lithium silicate particles and silicon carbon composite particles,
the graphite particles contained in the first layer have a BET specific surface area of 1 to 2.5 m2/g, and
a content of the Si particles is 6 mass % to 13 mass % relative to a total amount of the negative-electrode active material layer.