| 摘要 |
The present invention is related to a battery system for which a battery balancing method is applied. The battery balancing method comprises: checking a voltage balance of a battery pack (10); in case that no low voltage is generated in the battery pack, making the battery pack charge an assistant battery (20) and an ESS (40) using an LDC (30); and in case that a low voltage is generated in the battery pack, making the ESS charge the battery pack via a BMS (50), a controller (60) and a boost converter (70). Therefore, the present invention solves the collapse in the cell balancing of the battery pack in all vehicle state, and specifically enhances the applicability even in a hybrid electric vehicle (HEV) mode and an electric vehicle (EV) mode by widening the usability of the assistant battery and the ESS. [Reference numerals] (AA) Start;(BB) (High voltage) battery pack;(CC) Charge an ESS;(DD) Charge a voltage 12V assistant battery;(EE) End;(S10) Low voltage balancing of the battery pack collapses;(S100) Emergency charging system;(S110) Perform cell balancing;(S120) Detect a specific low voltage cell by checking a (high voltage) battery pack of BMS;(S130) BMS commands to charge the ESS;(S140) Low voltage amplification with a booster converter;(S150) Controller controls a switch relevant to the cell;(S160) Charge a (high voltage) battery pack by using a controlled relevant switch and the amplified voltage of a booster converter;(S170) Detect another low voltage cell;(S20) Normal charging system;(S30) Perform cell balancing |
