Canada Excellence Research Chair (CERC) in Hybrid Powertrain Program: Electric, Hybrid and Plug-in Hybrid Electric Vehicle Research

Energy Storage Systems Solutions

The trend toward more electric vehicles has created a need for high voltage, high efficiency, and long life energy storage systems. The objective of this project is to use our expertise and testing capabilities to develop a complete integrated energy storage systems solution for electric, hybrid electric, and plug-in hybrid electric vehicles. This modular design solution is able to work with battery systems with different chemical composition, capacity, and voltage. Several projects of the Canada Excellence Research Chair (CERC) in Hybrid Powertrain Program are being used to test the proposed solutions. The battery system solutions cover battery protection, energy management, thermal management, and cell balancing.

Battery protection is important to protect the battery system from undesirable conditions including over voltage, under voltage, over current, over temperature, and under temperature. Electronic control/management unit is the intelligent system, which is used to collect the information of the battery and to communicate with the main electronic control unit of the vehicle. Balancing is of critical importance concerning the life of the battery system because, without the balancing system, the individual cell voltages will drift apart over time. The capacity of the total pack will decrease more quickly during operation, which will result in the failure of the battery system. This condition is especially severe when the battery has a long string of cells (high voltage battery systems) and frequent regenerative braking (charging) is done.