LEAD ACID BATTERY MANUFACTURING METHOD AND LEAD ACID BATTERY

It is an object of the present invention to provide a lead-acid battery having a reliable exhaust structure suppressing unexpected leakage of acid mist and gas to outside the battery, and a method for fabricating such a lead-acid battery. [0002] A first gas exhaust path A for guiding gas generated in a plate pack from a cell compartment 2a to a recess 4 formed in a cover 3 is formed in the cover 3 of a lead-acid battery. A top lid 7 is placed on the top surface of the cover 3 to extend over the recess 4. Then, when the top lid 7 and the cover 3 are welded together by applying laser light 8a onto the top lid 7, a joint 10 is formed to continuously extend in the form of a band and form a closed shape so that the recess 4 and the top lid 7 form an exhaust chamber 11. A through hole 5 for establishing communication between a first opening 6a formed in the recess 4 and a second opening 6b formed in the outer surface of the cover 3, serves as a second gas exhaust path B which establishes communication with the first gas exhaust path A through the exhaust chamber 11.