| 摘要 |
In an electric tool battery, even in a case where poor connection or the like is generated in the wiring between one voltage monitoring element (32) and the cells (S3, S4), it is possible to monitor the voltages of the cells (S3, S4) by another voltage monitoring element (33), so that it is possible to achieve an improvement in terms of the reliability of the electric tool battery against overcharge etc. The electric tool battery includes a plurality of cells (S3, S4) connected in series and a plurality of voltage monitoring elements (32, 33) capable of doubly monitoring of the voltages of the individual cells (S3, S4) at the time of charging and discharging, and a lead plate (24) electrically connecting an electrode of the cell (S3) and an electrode of the cell (S4) has voltage signal extraction portions (24a, 24b) respectively corresponding to the voltage monitoring elements (32, 33), with the voltage signal extraction portions 24a, 24b and the voltage monitoring elements (32, 33) being respectively connected to each other by different conductors (36, 36c, 37, 37c). |
