SECONDARY CELL AND METHOD FOR BONDING LEAD THEREOF, AND BATTERY POWER SUPPLY

A battery power source device including a plurality of rechargeable batteries (1) having a laminated sheet as an outer case, and having extended positive and negative electrode leads of a metal foil is provided. A circuit board (3) and a plurality of rechargeable batteries are positioned in a pack case (2), a soldering land (21) is formed in the extending direction of the positive and negative electrode leads (11) and (12) of the rechargeable batteries, and a circuit pattern formed on the circuit board allows the circuit board and the rechargeable batteries to be connected without applying force in the bending or distortional direction to the positive and negative electrode leads of a foil.