Patent ID: 8648570
Filing Date: 2014-02-11
Classification: H02J,Y02E

Abstract:
1. A cell balancing method for a high-voltage battery pack, comprising steps of: a) measuring an electromotive force of each cell composing the battery pack; b) selecting a cell to be balanced based on the electromotive force of each cell; c) computing a total amount of charges used for balancing of the cell to be balanced from a state of charge (SOC) of each cell corresponding to the electromotive force of each cell using a lookup table, the lookup table being a two-dimensional lookup table of the electromotive force, a temperature and the state of charge (SOC); d) obtaining an accumulative amount of charges by measuring a terminal voltage of the cell to be balanced at a regular time interval when performing the balancing, finding a balancing amount of charges consumed for the regular time interval using another lookup table, and accumulating the balancing amount of charges while performing the balancing of the cell to be balanced, the other lookup table being a two-dimensional lookup table of the terminal voltage, the temperature and the state of charge (SOC); e) completing the balancing of the cell to be balanced when the accumulative amount of charges equals the total amount of charges, wherein: step a) further comprises the steps of: the first threshold time t the threshold amount of current i