Apparatus for stabilizing second protection using delay circuit

The invention first primary protection circuit over a non-operation or damage, or to stabilize the delay circuit capable of improving the open defect of the fuse due to a momentary IC output or noise due to the outside by the malfunction secondary protection of the battery pack circuit of the serves to provide a device, a plurality of cells are stacked layers of the lithium-ion batteries (Li-ion cell stack) it generates and monitors the voltage of each cell 1 to control the charging and discharging when charging or discharging at least the first voltage and a primary protection circuit, when monitoring the voltage of each cell, said first voltage is a higher voltage level than the higher to check this output secondary protection circuit, and a time at which the voltage level held output from the second primary protection circuit that defines When the time is to keep the threshold value at least by a first turn-on (turn-on) the switching device is to include a delay circuit for controlling such that the fuse is open. The battery pack, the protection circuit, the secondary protection circuit, the fuse open