Abstract
This paper presents a method to control the current
of each battery cell in a serially connected battery stack according
to each cell capacity. With this method, the performance of a battery
stack can be increased significantly. In a second life concept,
battery cells with different capacities and even battery cells with
different chemistries can be connected together. Moreover, if one
or more battery cells become inoperative, then the battery stack
can still be used in the limp-home operation mode. The required
power converter structure and the calculation of the individual
cell currents are presented, and a simulation for two different
power converters during discharging and charging is performed.
A current equalization prototype is used to validate the simulation
results and to show the performance on a real battery stack with
12 serially connected cells. Finally, the influence of the equalization currents and the capacity variance in the battery stack on the discharging energy are investigated.
| Original language | English |
|---|---|
| Pages (from-to) | 4227-4237 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Vehicular Technology |
| Publication status | Published - 2011 |
Research Field
- Not defined
Keywords
- Active balancing
- battery management
- lithiumion battery
- second life option