Patent ID: 9219366
Filing Date: 2015-12-22
Classification: H01M,H02J,Y02E,Y02P

Abstract:
1. An energy storage device for reducing a rush current, the device comprising: at least three battery packs configured to be coupled to a grid in parallel with each other; switches configured to electrically couple or block the at least three battery packs to or from the grid; and a battery management system (BMS) configured to control the at least three battery packs and the switches, wherein the BMS is configured to control the switches to sequentially couple the at least three battery packs to the grid in a lowest to highest order according to a voltage of each of the battery packs, wherein the BMS is configured to stabilize respective voltages and currents of the at least three battery packs during a first time holding operation when the at least three battery packs are blocked from the grid, and wherein the BMS is configured to stabilize voltages and currents of at least two battery packs that are coupled to the grid from among the at least three battery packs during a second time holding operation before additionally coupling a blocked battery pack from among remaining ones of the at least three battery packs that are blocked from the grid.