Patent ID: 8704405
Filing Date: 2014-04-22
Classification: H01M,H02J,Y02E

Abstract:
1. A parallel device, comprising: a battery module including a plurality of battery groups; a plurality of switching units including a plurality of first switches, each of the switching units being couplable to a respective battery group in series, each series combination of the switching unit and the respective battery group being coupled in parallel with another series combination, and each of the switching unit including a respective first switch coupled with a load in series; and a control module couplable to the battery module, wherein the control module is configured to receive values of measured voltages across at least two battery groups, calculate a voltage difference between the two received voltage values, compare an absolute value of the voltage difference to a reference voltage to obtain a voltage comparison result, and turn ON or OFF at least one of the first switches in accordance with the comparison result, wherein the reference voltage includes a first voltage reference and a second voltage reference, and wherein the first voltage reference is about 0 V-0.5 V, and the second voltage reference is greater than the first reference and is less than or equal to multiplication of a resistance of the and a maximum current value flowing through the battery groups.