US 11,699,825 B2
Secondary battery and method for manufacturing the same
Ryoichi Wakimoto, Hyogo (JP); Hirofumi Furukawa, Hyogo (JP); and Hiroyuki Yamada, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 16/479,744
Filed by SANYO Electric Co., Ltd., Daito (JP)
PCT Filed Jan. 23, 2018, PCT No. PCT/JP2018/001995
§ 371(c)(1), (2) Date Jul. 22, 2019,
PCT Pub. No. WO2018/139451, PCT Pub. Date Aug. 2, 2018.
Claims priority of application No. 2017-011354 (JP), filed on Jan. 25, 2017.
Prior Publication US 2021/0336305 A1, Oct. 28, 2021
Int. Cl. H01M 50/183 (2021.01); H01M 50/30 (2021.01); H01M 50/578 (2021.01); H01M 50/593 (2021.01); H01M 10/04 (2006.01); H01M 50/536 (2021.01)
CPC H01M 50/183 (2021.01) [H01M 10/0413 (2013.01); H01M 10/0436 (2013.01); H01M 50/30 (2021.01); H01M 50/578 (2021.01); H01M 50/593 (2021.01); H01M 50/536 (2021.01)] 10 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
an electrode assembly including a positive electrode plate and a negative electrode plate;
an exterior body having an opening and containing the electrode assembly;
a sealing plate that seals the opening;
a conductive member having an opening portion at a side facing the electrode assembly and disposed near a side of the sealing plate facing the electrode assembly;
a deformation plate that seals the opening portion and that is deformed in response to an increase in a pressure in the exterior body;
a current collecting member that electrically connects the positive electrode plate or the negative electrode plate to the deformation plate;
an insulating member disposed between the deformation plate and the current collecting member; and
a terminal that is electrically connected to the positive electrode plate or the negative electrode plate via the current collecting member, the deformation plate, and the conductive member,
wherein the insulating member includes a fixing projection and a displacement prevention projection on a surface thereof that faces the electrode assembly,
wherein the current collecting member has a fixing hole and a displacement prevention hole,
wherein the insulating member and the current collecting member are fixed to each other such that the fixing projection is disposed in the fixing hole and has a large-diameter portion formed at an end of the fixing projection,
wherein the displacement prevention projection is disposed in the displacement prevention hole,
wherein a conductive path between the positive electrode plate and the terminal or between the negative electrode plate and the terminal is broken in response to a deformation of the deformation plate,
wherein an outer dimension of a distal end of the displacement prevention projection is smaller than an inner dimension of the displacement prevention hole in a direction perpendicular to a thickness direction of the sealing plate, wherein the inner dimension of the displacement prevention hole is measured on a first surface opposed to a second surface of the current collecting member, the second surface facing to the electrode assembly in the thickness direction of the sealing plate, and
wherein an outer diameter of the fixing projection is greater than an outer diameter of the displacement prevention projection.