Abstract
Researchers at The Industrial Technology Research Institute (ITRI) have developed a new 8Ah prismatic lithium battery cell with high current charge and discharge capability for use in hybrid electric systems applications. When 40 cells are combined in series, the system is capable of producing 144V which can be boosted up to 288V by using a high power DC-DC converter. The design results in (1) lower manufacturing and operating costs, (2) improved safety characteristics, (3) improved heat dissipation, and (4) improved battery management.Particular emphasis have been given to enhancing both discharge and charge performance of the cell by optimizing material selection and structure to lower the internal resistance of the system, thereby improving both performance and safety characteristics for the single cell. By carefully tuning the design of both electrodes, this second generation cell can provide 300A of continuous discharge current while maintaining the ability to meet the minimum requirement for pulse power characteristics. This provides 625W of discharge power and the ability to accept 500W of regenerative power when the system is operated with the State of Charge (SoC) between 50 and 70%. The cell has also been designed to meet the abusive physical requirements associated with hybrid vehicle applications.This paper highlights system requirements, describes the research and development process, and provides experimental test results for the 8Ah cell. The battery module design is also described.
Highlights
Due to the oil crisis and environmental issues, Hybrid Electric Vehicles (HEV’s) have became popular during the past few years
The cell was discharged to 0% State of Charge (SoC) and rested for 1 hour, charged with 40A constant current until the cell voltage reached 4.2V
Due to higher internal resistance, the working region was narrowed to 52%-70% Depth of Discharge (DoD) in the mixed cathode cell, but was still found to be capable of meeting the minimum power-assist requirements established as goals for the Freedom CAR
Summary
Due to the oil crisis and environmental issues, Hybrid Electric Vehicles (HEV’s) have became popular during the past few years. A high power, high current charge/discharge capability battery system is needed for improved performance of HEV’s. The power and high current capability of lithium ion cell have increased dramatically, making lithium ion batteries an attractive alternative to lead-acid batteries for HEV applications. A new 8Ah prismatic lithium ion battery with high current charge and discharge capability has been developed in our research institute (ITRI). This is a research project of HEV development sponsored by the Bureau of Energy (BOE), Ministry of Economic Affair (MOEA) in Taiwan. The 2nd generation cell was designed to meet both the discharge and regeneration requirement for HEV applications. The test procedures from the Freedom CAR [4] program were used to evaluate performance of the 2nd generation cell
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