An apparatus for measuring accumulator essential resistance

The utility model discloses an apparatus for measuring accumulator essential resistance, it includes square wave pulse generating circuit, constant current discharge circuit and capacitance voltage memory circuit, constant current discharge circuit connection is between two outputs of battery, square wave pulse generating circuit connects the constant current discharge circuit and can drive this constant current discharge circuit and carries out intermittent type nature with constant current source and discharge, capacitance voltage memory circuit connects the voltage information between two outputs that can remember this battery between two outputs of battery, and then obtain the interior resistance of battery. It has following advantage: simple structure measures the stable performance, does not receive external signal interference, and measurement accuracy is high, simultaneously through carrying out pulsed intermittent discharge to the constant current discharge circuit, there is not any harm to the battery, the security of device operation has improved.