Abstract
The Kansai Electric Power Co., Inc.(Kansai Denryoku) and Sumitomo Electric Industries, Ltd. began a joint research project on Redoxflow flow batteries in 1985. At the start of the research, mini cells with an electrode area of 9(cm)^2 were developed in order to select appropriate battery materials. As progress was made in the research, the battery scale has been successively enlarged, and the project has now reached the stage of practical application with Redoxflow battery systems as large as several hundred kW, and even several MW, being delivered to universities and factories. This paper describes the principle and features of Redoxflow batteries, reports the scope of applicability and gives examples of practical applications of Redoxflow batteries.
