| 摘要 |
PURPOSE: Provided are a secondary battery device which comprises an overdischarge protective unit and a method of protecting an overdischarge of the secondary battery. CONSTITUTION: The secondary battery device comprises: a secondary battery for supplying electric power into a load circuit; a load state judging unit for judging an operation state of said load circuit; and an overdischarge protective unit connected to the secondary battery for detecting a discharged state of the secondary battery and breaking the discharge from the secondary battery when the secondary battery reaches a predetermined overdischarged state. The over discharge protective unit allows the supply of electric power into the load circuit to continue without breaking the discharge from the secondary battery when the load state judging unit judges that the load circuit stays in a predetermined operation state requiring a protection of power supply. The method for protecting an overdischarge of a secondary battery comprises: supplying electric power into a load circuit; judging an operation state of the load circuit; and detecting a discharged state of said secondary battery and breaking the discharge from the secondary battery when the secondary battery reaches a predetermined overdischarged state, wherein the supply of electric power into the load circuit continues without breaking the discharge from the secondary battery when the load circuit is judged that it stays in a predetermined operation state requiring a protection of power supply.
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