US 12,080,855 B2
Non-aqueous electrolyte secondary battery
Takafumi Hosokawa, Hyogo (JP); Takashi Hosokawa, Hyogo (JP); Kyohei Kobayashi, Kyoto (JP); and Shuji Ogawa, Fukuoka (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/286,683
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Nov. 25, 2019, PCT No. PCT/JP2019/045912
§ 371(c)(1), (2) Date Apr. 19, 2021,
PCT Pub. No. WO2020/110975, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 2018-222463 (JP), filed on Nov. 28, 2018.
Prior Publication US 2021/0351441 A1, Nov. 11, 2021
Int. Cl. H01M 10/0587 (2010.01); H01M 10/0525 (2010.01); H01M 50/46 (2021.01); H01M 50/463 (2021.01); H01M 50/489 (2021.01); H01M 50/409 (2021.01)
CPC H01M 10/0587 (2013.01) [H01M 10/0525 (2013.01); H01M 50/46 (2021.01); H01M 50/463 (2021.01); H01M 50/489 (2021.01); H01M 50/409 (2021.01)] 6 Claims
OG exemplary drawing
 
1. A nonaqueous electrolyte secondary battery comprising:
an electrode assembly formed by winding, into a flat shape, a first electrode plate having a first electrode mixture layer formed on a first electrode current collector, a second electrode plate having a second electrode mixture layer formed on a second electrode current collector, and a separator therebetween,
wherein the electrode assembly has a pair of curved portions located at either end and a flat portion between the pair of curved portions,
wherein in at least one of the pair of curved portions, at least two layers of the second electrode plate are disposed on an inner side of a curved portion of the first electrode plate located at an innermost circumference, and
wherein each of the at least two layers of the second electrode plate disposed on the inner side of the curved portion of the first electrode plate located at the innermost circumference has the second electrode mixture layer formed on both sides of the second electrode current collector.