In this way, the balancing current is able to be kept at the desired level rather than reduced during the balancing process. We think that this work will lead to an increase in efforts on the development of an advanced BEC for EV applications. If the conduction time T on of the switch Q 1 is fixed, it can be seen from Equation (2) that the peak current I pk will drop, which results in a prolonged equilibrium time. This method can be subdivided into five methods: the shunt inductor, boost shunting, multiple transformers, multi secondary windings transformer, and switched transformer ones. J. Lithium ion battery chemistries from renewable energy storage to automotive and back-up power applications—An overview.

The VOT method measures the voltage of the high-SOC battery to obtain the conduction time of the main switch; thus, the balancing current can be maintained at a constant value. As the switching frequency increases, leakage inductance increases, so the current waveform in Figure 4 is close to linear change. The adaptive duty cycle can be acquired through fuzzification, a rule table, and a defuzzification process.

In Proceedings of the 2nd IEEE Conference Industrial Electronics and Applications, Harbin, China, 23–25 May 2007; pp. With rapid economic development, population growth, and the emissions from internal combustion engine vehicles, the issues of energy shortage and global warming have emerged gradually. H. A Non-Dissipative Equalizer with Fast Energy Transfer Based on Adaptive Balancing Current Control.

To verify the effectiveness of the proposed DAH equalizer used in lithium-ion batteries and its phase shift control strategy, an experimental prototype with 4 lithium-ion cells is established as shown in Figure 7.The VOT method calculates the conduction time every switching cycle by simply detecting the voltage of a high-SOC cell to maintain the balancing current in the whole balancing process. No matter which circuit of the mentioned topology above is utilized, the charge is only transferred from one cell to an adjacent one through an individual cell equalizer with this method. The topology shown in Figure 1 can be extended by adding a transformer coil and two cells in series to form a multi-active half-bridge equalizer. The energy consumption equalizer adopts a resistor and switch tube in series and then in parallel with the cell. Therefore, if the magnitude of the balancing current can be regulated according to the voltage of the battery, it could speed up the balance.