US 12,412,961 B2
Square secondary battery
Yuma Kamiyama, Osaka (JP); and Ryoichi Wakimoto, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/791,328
Filed by SANYO Electric Co., Ltd., Kadoma (JP)
PCT Filed Jan. 19, 2021, PCT No. PCT/JP2021/001683
§ 371(c)(1), (2) Date Jul. 7, 2022,
PCT Pub. No. WO2021/161738, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 2020-022465 (JP), filed on Feb. 13, 2020.
Prior Publication US 2023/0352799 A1, Nov. 2, 2023
Int. Cl. H01M 50/474 (2021.01); H01M 50/103 (2021.01); H01M 50/15 (2021.01); H01M 50/486 (2021.01); H01M 50/538 (2021.01); H01M 10/04 (2006.01); H01M 50/477 (2021.01)
CPC H01M 50/474 (2021.01) [H01M 50/103 (2021.01); H01M 50/15 (2021.01); H01M 50/486 (2021.01); H01M 50/538 (2021.01); H01M 10/0431 (2013.01); H01M 10/0468 (2013.01); H01M 50/477 (2021.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11)] 6 Claims
OG exemplary drawing
 
1. A rectangular secondary battery comprising:
a flat electrode body configured such that a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween;
a rectangular battery case having an opening and housing the electrode body; and
a sealing plate sealing the opening,
wherein the electrode body is housed in the battery case such that a winding axis of the electrode body is parallel with a longitudinal direction of the sealing plate,
at an end portion of the electrode body in a winding axis direction thereof, an edge of the positive or negative electrode plate is connected to an external terminal fixed to the sealing plate through a current collector,
an insulating pressing member contacting the sealing plate and the electrode body is arranged between the sealing plate and the electrode body,
the pressing member is configured to press a portion of the electrode body in a direction perpendicular to the winding axis of the electrode body thereby maintaining said portion in a bent state such that a distance between said portion of the electrode body contacting the pressing member and the sealing plate is longer than a distance between the end portion of the electrode body in the winding axis direction thereof and the sealing plate, and
wherein the pressing member is located only on an end portion of the electrode body facing the sealing plate and along an adjacent curved shape of the end portion of the electrode body.