Patent ID: 8044638

Claim:
A monitoring system for monitoring low voltage disconnecting value of a secondary battery connected between a secondary battery and a functional unit, the monitoring system comprising: a signal collecting apparatus connected to the secondary battery and capable of reading voltage signals of the secondary battery at regular intervals; an analog-digital converter connected to the signal collecting apparatus and capable of receiving the voltage signals and converting the voltage signals into digital signals; a processor connected to the analog-digital converter and capable of processing the digital signals and evaluating a voltage change ratio to determine whether the voltage of the secondary battery reach a low voltage disconnecting value; a switch comprising a switch input terminal, a switch output terminal, and a switch control terminal, wherein the switch input terminal is connected to the secondary battery, the switch output terminal is connected to the functional unit, the switch being capable of connecting and disconnecting the secondary battery; and a controller connected between the switch control terminal and the processor and capable of controlling status of the switch according to the determined result of the processor.