Patent ID: 8323811

Claim:
A lead acid storage battery comprising: a battery container housing a plurality of cells; a middle lid arranged so as to cover the battery container; and an upper lid arranged so as to cover the middle lid, wherein, on an upper surface of the middle lid, gas discharging ports are formed for discharging gas generated inside of the cells, respectively, and electrolyte recirculating ports are formed for recirculating moisture to be discharged along with the gas within the cells, respectively, wherein at least a plurality of exhaust chambers are formed in a space surrounded by the middle lid and the upper lid such that adjacent ones of the exhaust chambers are separated by an exhaust chamber partition, the plurality of exhaust chambers being interconnected for collectively exhausting the gas discharged from the gas discharging ports to an outside of the battery, and wherein at least one of the upper lid and the middle lid comprises a high thermal conduction member and porous members, the high thermal conduction member having a thermal conductivity higher than that of a member composing a wall surface of the exhaust chambers, the porous members being arranged on a bottom surface of the upper lid such that a porous member is provided in each of the cells, the porous members being made of porous material.