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A Battery Management System Using an Active Charge Equalization Yechnique Based on DC-DC Converter Topology

Yarlagadda, Sriram

Abstract Details

2011, Master of Science in Engineering, University of Akron, Electrical Engineering.

Several alternative approaches are presently being considered to replace gasoline for portable energy. The efficient utilization, storage and management of energy are extremely important with regard to portable energy supply. The most abundant commodity available in the market for portable energy storage is the battery. Series strings of storage batteries are used in portable electrical appliances, electric vehicles, space vehicles, telephone industry, power system industries and military applications. Each battery when operating in series has a slightly different capacity due to manufacturing tolerances and environmental conditions. After several charge/discharge cycles, the battery strings tend to go out of balance. This is the motivation to develop a Battery Management system (BMS) to increase the capacity and efficiency of batteries. In this work, a BMS is developed for lead-acid batteries in series which monitors the state of all the batteries in the stack by keeping track of battery operational parameters such as voltage, charge during charging/discharging, idle periods and ensures proper operational conditions to safeguard the battery pack from degrading its useful life.

A novel active charge equalization technique is proposed to achieve the balancing of batteries in a stack in terms of both voltage and charge as the battery is being charged/discharged, and in idle periods in order to maximize the energy of stack. In the proposed scheme, the energy is transferred to the battery with lowest voltage from a battery with highest voltage. An overvoltage and over-discharge protection circuit has also been developed to reduce the degradation of battery life. The proposed scheme comprises of the following: • Dissipative schemes of charge equalization where extra energy is somehow dissipated across passive elements. • Bidirectional DC/DC converters which are expensive and tough to implement. • Switching capacitive schemes of equalization where energy is transferred to the neighboring cells.

Tom T. Hartley, PhD (Advisor)
Iqbal Husain, PhD (Advisor)
Yilmaz Sozer, PhD (Committee Member)
143 p.

Recommended Citations

Citations

  • Yarlagadda, S. (2011). A Battery Management System Using an Active Charge Equalization Yechnique Based on DC-DC Converter Topology [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1306852610

    APA Style (7th edition)

  • Yarlagadda, Sriram. A Battery Management System Using an Active Charge Equalization Yechnique Based on DC-DC Converter Topology. 2011. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1306852610.

    MLA Style (8th edition)

  • Yarlagadda, Sriram. "A Battery Management System Using an Active Charge Equalization Yechnique Based on DC-DC Converter Topology." Master's thesis, University of Akron, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1306852610

    Chicago Manual of Style (17th edition)