Patent ID: 7470482

Claim:
A rectangular air battery comprising: a) a rectangular first case serving as a positive electrode terminal, said first case comprising: a bottom with air holes; four sidewalls that are continuous and connected to said bottom; and an upper opening that is defined by said sidewalls; b) a rectangular second case serving as a negative electrode terminal, said second case comprising: a bottom; four sidewalls that are continuous and connected to said bottom; and an upper opening that is defined by said sidewalls; c) an air diffusion paper, a water repellent film, an air electrode, and a separator, which are layered in this order on the bottom inside the first case; d) an insulating gasket with a substantially U-shaped cross-section, said insulating gasket comprising: four outer sidewalls; four inner sidewalls; and a bottom connecting said outer sidewalls with said inner sidewalls, said insulating gasket being fitted to said second case so as to sandwich the sidewalls of said second case between the outer sidewalls and the inner sidewalls; and e) a negative electrode which contains an electrolyte and is accommodated in the second case, said first case and said second case being joined such that the opening of the second case faces the bottom of the first case, said first case and said second case being sealed by crimping the opening edge of the sidewalls of the first case onto the outer face of the second case, with the outer sidewalls of said insulating gasket interposed therebetween, wherein a rib is provided on the bottom of the first case so as to protrude inward inside the first case, said rib extends along the sidewalls of said first case, and said rib supports the inner lower end of the inner sidewalls of said insulating gasket, with at least said separator interposed therebetween.