| 摘要 |
PROBLEM TO BE SOLVED: To suppress large-sizing of a battery pack by enabling to wire a plurality of signal wires compactly. SOLUTION: The battery pack of an electric tool is equipped with the case body part 12 open in the upper part, a lid part to occlude an opening 12h of the case body part 12, a plurality of pieces of storage batteries Se housed in the case body part 12, terminals Pt, Nt for charge and discharge in order to connect the storage battery Se to the electric tool or a charger, a control part 22 to monitor charge-discharge states of the storage battery Se based on a signal from the storage battery Se, and a signal wire to lead the signal of the storage battery Se to the control part 22. Signal wires are installed in a plurality of numbers, and those signal wires are formed in a sheet of a belt-like flexible substrate 30. COPYRIGHT: (C)2010,JPO&INPIT |
