High power and long life lithium-ion battery for backup power sources

Japan Storage Battery Co., Ltd. developed new prismatic lithium-ion batteries for the stationary applications such as short-period backup power sources, especially for demand of the high-rate discharge capability. Our lithium-ion batteries have a rated capacity ranging from 10 to 80 Ah capable of continuous full discharge at from 5 to 10 C rate with about 1/3 and 1/4 of the lead-acid battery with the same energy in the volume and weight, respectively. Our battery module consisting of the lithium-ion battery with battery management unit (BMU) exhibits extremely the excellent high-rate discharge performance, which leads to make the 5 kVA power supply system half in both size and weight compared with the conventional one equipped with lead-acid battery. Furthermore, the calendar life of longer than 10 years at room temperature is to be predicted for our lithium-ion battery using improved positive and negative active materials, based on the battery-life theory.