APPARATUS AND METHOD FOR DETERMINING DEGRADATION OF STORAGE BATTERY

摘要

PROBLEM TO BE SOLVED: To determine the presence or absence of degradation of a storage battery during the operation of a load in an apparatus and a method for determining degradation of the backup storage battery for an electric power supply.

SOLUTION: The storage battery degradation determining apparatus includes: a current detection circuit by a resistor 4 etc. for detecting a current supplied for the load 3; an electronic load circuit including a transistor 10 etc. capable of regulating a passing current by applying a voltage of the storage battery at the determination of degradation of the storage battery 1; a current control circuit 11 for controlling the electronic load circuit in such a way that the sum of the current supplied for the load 3 and the current passing though the electronic load circuit may become a prescribed value corresponding to the capacity of the storage battery 1 at the determination of degradation of the storage battery 1; and a determining circuit 15 for determining the presence or absence of degradation of the storage battery 1 by measuring changes in a terminal voltage of the storage battery 1 at the determination of degradation of the storage battery 1. It is determined that the storage battery 1 has degraded when the terminal voltage is reduced to a determination voltage or lower.

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