CELL BALANCING TOPOLOGIES FOR A LITHIUM ION BASED BATTERY FOR ELECTRIC VEHICLE APPLICATION
The work focusses on cell equalization techniques for a Li-ion battery for EV application. The cell balancing plays a significant role for the long lasting of a battery. For an ideal condition, each of these battery cells connected series in a string are assumed to be identical with respect to each other. But due to some factors there would be imbalance between each of these cells. The charging and discharging cycles of the batteries will fluctuate as a result of these variations, resulting in differences in the SOCs or terminal voltages of each cell. The battery pack's entire charging process is limited by the highest charged cell (stored energy) during the charging cycle. Similarly, the battery pack's least charged (stored energy) cell limits the total discharge of the battery pack. As such, the battery pack remains underutilized when the battery cells are imbalanced. The underutilization of the usable cell energy will eventually lead to permanent damage of the cells. Hence, the life of the whole battery pack is influenced by the cell imbalances which would accelerate the aging of the pack. reducing the battery life drastically. A cell balancing or equalization circuit works on the principle of equating the cell voltages or cell SOCs of all cells of a battery pack.
V, Vipin, "CELL BALANCING TOPOLOGIES FOR A LITHIUM ION BASED BATTERY FOR ELECTRIC VEHICLE APPLICATION" (2022). Technical Collection. 45.