Patent ID: 9013148
Filing Date: 2015-04-21
Classification: H01M,H02J,Y02B,Y02E,Y02P

Abstract:
1. A basic unit for a lithium-ion battery pack, comprising: two or more serially-connected lithium-ion cells; a balancing lithium-ion cell configured to be separately connected, in parallel, with each of the serially-connected lithium-ion cells during a charging operation or a discharging operation; and a controller configured to selectively connect the balancing lithium-ion cell in parallel to one of the serially-connected lithium-ion cells that has a highest voltage among the serially-connected lithium-ion cells during a charging operation of the serially-connected lithium-ion cells, wherein the controller is configured to selectively connect the balancing lithium-ion cell in parallel to one of the serially-connected lithium-ion cells that has a lowest voltage among the serially-connected lithium-ion cells during a discharging operation of the serially-connected lithium-ion cells.