| 摘要 |
PROBLEM TO BE SOLVED: To easily and surely determine a proper life end of a cell without being influenced by the phenomenon of sudden reduction of capacity caused by memory effect, or by leaving few days in spite that the state just after charging was normal. SOLUTION: The life determining method of the secondary cell is carried out so as to go through a first step, determining whether a first condition, by which the time elapsed until the battery voltage reaches to a prescribed critical voltage of using under a certain discharging state, is longer than the first prescribed standard time, is fulfilled or not; and a second step, determining whether a second condition, by which the time elapsed until the battery voltage reaches to a prescribed discharge stopping voltage under a certain discharging state, is longer than the second prescribed standard time, is fulfilled or not. When both of the first and the second conditions are not fulfilled, the cell is determined that it is in the state of life end, and when either one of the first or the second conditions is not fulfilled, a certain period after full charging, a third step, which determines whether the first condition is fulfilled or not, is carried out, and when the first condition is not fulfilled, the cell is judged that it is in the state of life end.
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