| abstract |
The present invention relates to an alkaline battery having a flat, preferably rectangular parallelepiped housing. The battery can be equipped with a negative electrode containing zinc and a positive electrode containing nickel oxohydroxide. The total thickness of the casing is relatively thin, typically about 5-10 mm, but may be thinner than that. The battery contents can be filled into the casing from the open end, and then the end cap assembly can be inserted into the open end to seal the battery. The end cap assembly is provided with a venting mechanism, preferably a slotted vent, where the gas pressure in the battery is at a threshold level of about 1,724 × 10 3 to 5,515 × 10 3 Pascal gauge (250 ˜800 psig) can be activated. The battery can be equipped with a complementary venting mechanism (such as a laser welding area on the casing surface) that operates at a pressure level higher than the pressure. |