| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery system that performs an appropriate abnormality determination of cells based on an internal resistance of the cells.SOLUTION: The battery system includes: an assembled battery 20 including a plurality of battery cells 21 connected in series; voltage sensors 41 for detecting output voltages of the battery cells 21, respectively; a current sensor 42 for detecting a charge/discharge current of the assembled battery 20; and a control device 10. The control device 10 sets any one of the plurality of battery cells 21 as a reference cell. The control device 10 also calculates each resistance ratio that is the ratio of a value of internal resistance of the reference cell to a value of internal resistance of a battery cell different from the reference cell on the basis of detection values of output voltages of the battery cells 21 and a detection value of a charge/discharge current of the assembled battery. The control device 10 then determines whether or not an abnormal rise in temperature occurs in each battery cell on the basis of the resistance ratio. |
