Patent ID: 7998612
Filing Date: 2011-08-16
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery comprising: an electrode group that includes a positive electrode plate and a negative electrode plate that are constructed by forming a material mixture layer made of an electrode material mixture that contains an active material on one surface or both surfaces of a strip-shaped current collector, and forming an exposed portion in which a surface of said current collector is exposed in one end portion in a width direction of said current collector, and a separator that is interposed between said positive electrode plate and said negative electrode plate, said electrode group being constructed by spirally winding or laminating said positive electrode plate, said negative electrode plate and said separator; a positive electrode current collector terminal plate that is disposed on one end side of said electrode group and is connected to said current collector exposed portion of said positive electrode plate; a negative electrode current collector terminal plate that is disposed on the other end side of said electrode group and is connected to said current collector exposed portion of said negative electrode plate; an electrolyte; a battery case that has a bottom portion and an opening portion disposed opposite to said bottom portion, is connected to one of said positive electrode current collector terminal plate and said negative electrode current collector terminal plate, and houses said electrode group, said positive electrode current collector terminal plate, said negative electrode current collector terminal plate and said electrolyte; a sealing plate that is connected to the other of said positive electrode current collector terminal plate and said negative electrode current collector terminal plate and seals the opening portion in an insulated state from said battery case; and one or more elastic members that have conductivity, are disposed at least one of between said the bottom portion of said battery case and one of said current collector terminal plates and between said sealing plate and the other of said current collector terminal plates, electrically connect members that sandwich the elastic member, bias said electrode group toward said bottom portion of said battery case or said sealing plate, have a dead zone in which an elastic force does not fluctuate according to an amount of deformation in a range from a first predetermined amount X to a second predetermined amount Y, wherein 0<x<Y, and are compressed upon installation to the extent that the amount of deformation is within said dead zone.