Patent ID: 8142919
Filing Date: 2012-03-27
Classification: H01M,Y02E

Abstract:
1. A battery pack apparatus comprising: at least one battery assembly including at least one secondary battery connected in series; a plurality of medium feeding parts for feeding medium to said battery assembly and a neighborhood thereof to adjust a temperature of at least a part of said battery assembly; at least one temperature detector for detecting a temperature of said battery assembly; a storage unit for storing a relation between a temperature of said battery assembly and a revolution level indicating a relative level of a revolution of said medium feeding parts, wherein said storage unit further stores a resonance point frequency of a package of the battery pack apparatus which packs at least one battery assembly therein; and a controller for receiving the temperature of said battery assembly detected by said temperature detector, reading out a revolution level corresponding to the temperature of said battery assembly from said storage unit, and allocating the revolution level to said plurality of medium feeding parts, wherein when all of the revolution levels allocated to said respective medium feeding parts are substantially equal to each other, said controller controls said plurality of medium feeding parts so that a revolution level that is different from the value of the all same revolution levels is sequentially selected in each predetermined time by at least one medium feeding part, and wherein said controller changes the revolution level of at least one of the plurality of medium feeding parts when an absolute value of a difference between oscillation frequencies of the medium feeding parts corresponding to the revolution levels of any two of said plurality of medium feeding parts is in a predetermined range including the resonance point frequency stored in the storage unit.