BATTERY PACK, BATTERY PACK STRUCTURE, VEHICLE EQUIPPED WITH BATTERY PACK OR BATTERY PACK STRUCTURE, AND CONTROL METHOD OF BATTERY PACK OR BATTERY PACK STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a battery pack capable of bringing the charge/discharge cycle life close to that of a battery pack assembled with cells containing no defects even in the charge/discharge cycle life in the case where defective cells having high internal resistance are mixed or internal resistance is increased caused by mixing of one or more cells whose capacities are early deteriorated. SOLUTION: This battery pack is equipped with a battery line in which x pieces of unit cells of a secondary battery are connected in series; a battery group in which y lines of the battery line are connected in parallel (wherein, x>=1, y>=2); a voltmeter 9 connected to the battery group in parallel and detecting the voltage of the battery group; a measured signal detecting means detecting a measured signal from the voltmeter 9; and a controller 12 connected to the voltmeter 9 and a generator 11, and the voltmeter 9 and a driving motor 10 respectively in series, and the controller 12 judges a charged state of the battery group based on the detected measured signal, and indicates charge/ discharge to the generator 11 and the driving motor 10.