SEALED SECONDARY BATTERY

摘要

Disclosed is a sealed secondary battery in which an electrode group (1), comprising a positive electrode plate and a negative electrode plate wrapped or stacked with a porous insulator interposed therebetween, is housed in a metal case (4). The opening of the metal case (4) is sealed by a sealing plate (6) which is also one of the electrode terminals, and either the positive electrode plate or the negative electrode plate is connected to the sealing plate (6) via a lead. Disposed on top of the electrode group (1) is a top insulation plate, in which a first insulation plate (2) and a second insulation plate (7) with a higher softening temperature than the first insulation plate (2) are stacked, and the peripheral portion of the top insulation plate is disposed so as to engage with an engaging portion (9) formed on the side of the metal case (4).