BATTERY CONTROL DEVICE, ELECTRICITY STORAGE DEVICE, METHOD FOR OPERATING ELECTRICITY STORAGE DEVICE, AND PROGRAM

摘要

According to the present invention, secondary battery cells (100) are connected to each other in series. A measuring part (120) measures the total value of the voltages of the plurality of secondary battery cells (100). A balancing circuit (140) balances the voltages of the plurality of secondary battery cells (100). A controller (160) controls the balancing circuit (140). Specifically, the controller (160) operates the balancing circuit (140) either when the charging rate of the plurality of secondary battery cells (100) is 50% or less, or when the total value of voltages of the secondary battery cells (100) is equal to or less than a first reference value and a graph showing the total values of voltages using the charging rate as a variable has a differential absolute value equal to or greater than a second reference value.