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We propose a magnetic field resonance type wireless power transfer system for the Li-ion battery (Lithium-ion battery). The transmitting efficiency is changed by the changing of the charging current to the storage battery. The system places the DC/DC converter at both of the primary and secondary sides. This system suppresses the degradation of transmitting efficiency due to the secondary side load...
Development of distributed power systems with photovoltaic (PV) panels and storage batteries has become very active. Since the generated power by PV panel is unstable, development of an intelligent and efficient charging system is strongly demanded. Also, the distributed systems are optimized by co-operating by each node. Thus, inexpensive and quickly responding PV emulation system is effective to...
This paper discusses an SOC estimation system for lithium ion batteries based on the extended Kalman filter. The accuracy of the estimation is strongly dependent on accuracy of the battery model. We have newly formulated the equivalent circuit model that covers temperature and SOC dependencies. As the result, the error rate of the estimation has been improved significantly. The experimental results...
This paper discusses the theory and experiments of heating and air cooling of battery modules. Heating mechanism is shown first, and cooling of a single battery is examined. Optimum air flow speed is discussed. Then, similar discussion is made for a battery module of six serial cells.
Mobile systems with lithium-ion batteries have become very popular. Higher performance, longer battery life, and safer operation are required for those systems. We have developed a method of the thermal management system for lithium-ion batteries for mobile systems. An evaluation system has been built with micro-processor with analog interface, and FPGA. It provides a charge and discharge speed control...
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