Patent ID: 8680878

Claim:
A current measuring device for measuring an electric current flowing through between a terminal of a battery and a wire, the battery having a side surface and an upper surface continuous with the side surface, the current measuring device comprising: a resistance member having a length and first and second ends in a direction of the length, the first end to be secured electrically to the terminal of the battery, the second end to be secured electrically to the wire, the resistance member constituting a current flow path between the terminal of the battery and the wire; and a circuit board in which a current measuring circuit is installed, the current measuring circuit being configured to measure an electric current flowing through the resistance member based on a potential difference between two different first and second points defined on the resistance member, wherein the resistance member comprises: a resistor, the resistor comprising: a first resistance portion extending along one of the side surface and the upper surface of the battery; a second resistance portion extending along the one of the side surface and the upper surface of the battery; a turned through which the current flow path extends, the turned portion continuously physically joining the first and second resistance portions, the first and second points being defined on the respective first and second resistance portions; and a pair of potential-difference sensing terminals connected to the respective first and second points.