US 9,812,686 B2
Manufacturing method of secondary battery, secondary battery, and assembled battery
Tomonori Kako, Kyoto (JP); and Sumio Mori, Kyoto (JP)
Assigned to GS YUASA INTERNATIONAL LTD., Kyoto-Shi, Kyoto (JP)
Appl. No. 13/806,995
Filed by Tomonori Kako, Kyoto (JP); and Sumio Mori, Kyoto (JP)
PCT Filed Jun. 22, 2011, PCT No. PCT/JP2011/064202
§ 371(c)(1), (2), (4) Date Feb. 4, 2013,
PCT Pub. No. WO2012/002201, PCT Pub. Date Jan. 5, 2012.
Claims priority of application No. 2010-148475 (JP), filed on Jun. 30, 2010.
Prior Publication US 2013/0130079 A1, May 23, 2013
Int. Cl. H01M 2/12 (2006.01); H01M 2/36 (2006.01); H01M 10/04 (2006.01); H01M 2/02 (2006.01); H01M 10/0525 (2010.01); H01M 10/058 (2010.01)
CPC H01M 2/1223 (2013.01) [H01M 2/365 (2013.01); H01M 10/04 (2013.01); H01M 2/0217 (2013.01); H01M 2/367 (2013.01); H01M 10/058 (2013.01); H01M 10/0525 (2013.01); Y10T 29/4911 (2015.01)] 17 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a case;
a lid formed in an opening of the case, and comprising a safety valve and an opening portion;
a first sealing body formed in the opening portion, the first sealing body being displaced or deformed by a pressure difference between an inside and an outside of the case in such manners that the first sealing body is pressed by internal pressure to allow outflow of inside air from the opening portion when the internal pressure in the case is higher than external pressure and that the first sealing body is pressed by the external pressure to prevent entry of outside air from the opening portion when the internal pressure in the case is lower than the external pressure, and the first sealing body being displaced to allow the inside air to flow out of the case through the opening portion, by an internal pressure which is less than an actuation pressure of the safety valve; and
a second sealing body comprising a sealing plate formed on the opening portion and welded to the lid so as to seal the opening portion, the second sealing body being resistant to an internal pressure greater than the actuation pressure of the safety valve,
wherein the first sealing body and the second sealing body are fixed to each other, and
wherein the opening portion comprises a first portion and a second portion having a width which is greater than a width of the first portion.