Abstract: A method for charging a non-aqueous electrolyte secondary battery, the battery comprising a positive electrode that comprises a lithium-containing composite oxide, a negative electrode, and a non-aqueous electrolyte. The method comprises the step of detecting an open-circuit-voltage of the battery to determine which of voltage regions A, B and C the detected value is included in. The region A is not smaller than a prescribed value X. The region B is smaller than the prescribed value X and larger than a prescribed value Y (Y<X). The region C is not larger than the value Y. According to the determination, charging is stopped when the detected value is included in the region A, charging is conducted when the detected value is included in the region B, or discharging is conducted until a closed-circuit-voltage of the battery becomes not larger than a prescribed value Z and then charging is conducted, when the detected value is included in the region C.

Abstract: 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.

Abstract: A battery and a battery pack comprising a rechargeable battery (2) and a circuit substrate (3) integrated therein by a resin mold package (11) are provided.

Abstract: 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.

Abstract: A battery pack that reduces thickness and lightens weight as required for battery power sources of portable electronic equipment. A battery pack is constituted by accommodating a battery and battery protection device between a top case and bottom case forming a pack case. Since the battery is formed accommodated within an external casing wherein positive and negative electrode plates are formed by laminated sheet, reduced thickness and reduced weight of battery pack can be achieved. Also, since the face of bottom case opposite the battery is formed as a resiliently deformable face which is formed of small thickness, when expansion takes place such that the thickness of the battery as a whole increases, resiliently deformable face deforms maintaining a planar condition by resilient deformation, so that there is no possibility of an adverse effect on the equipment due to drum-shaped swelling being produced in battery pack, by such swelling.