Abstract
An 8Ah prismatic lithium ion cell with high current charge and discharge ability has been developed. Due to the safety and cost issues, the power type Li-ion cell was designed by using LiMn2O4 and carbon as cathode and anode materials, respectively. Specific power, discharge rate capability and safety performance of the battery is enhanced through the receipt of material system, electrodes design and new conducting mechanism for the cell structure. The internal resistance of the cell is lower than 2mΩ. The performance tests show the specific power of the new developed cell is over 2000W/kg at 80% SOC. For the rate capability characteristic at room temperature (25 oC), the cell can be retained 93.6% of its initial capacity when discharge at 15C rate (120A). Safety tests including nail penetration, external short circuit and overcharge are investigated. The results show neither explosion nor fire under all safety test conditions. A 14.4V battery module including 4 cells in series and integrated battery management system (BMS) has been developed. The BMS is capable of monitoring cell condition (voltage, temperature and current), charge/discharge management and safety protection. 10 modules (40 cells) are connected in series to achieve a 144V battery system for HEV. The discharge power of this battery system is higher than 12.5kW at 50%SOC, which meets the requirements of HEV applications.
Highlights
Due to oil crisis and environmental issue, Hybrid Electric Vehicle (HEV) became popular during past years
Battery system still plays an important role in HEV application
It is known that lithium ion battery has superior energy and power density
Summary
Due to oil crisis and environmental issue, Hybrid Electric Vehicle (HEV) became popular during past years. A previous work has been done for developing propulsion system is a full parallel hybrid electric 18kW power-train and consists of a 375cc lean burn engine and a 6kW motor with an 88.8V, 20Ah Li-ion battery system [1,2,3]. This is a national research project for HEV development from the support of Bureau of Energy, Ministry of Economic Affair in Taiwan.
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