| 摘要 |
A temperature detection device (4) of the present invention is provided in a battery pack (1) for electric power tool and detects a temperature inside the battery pack (1). The temperature detection device (4) includes a signal output circuit (6, D2) and an output signal-based temperature detection unit (5). The signal output circuit (6, D2) is configured to output an output signal for use other than for indicating an ambient temperature thereof. A state of the output signal changes depending on the ambient temperature. The output signal-based temperature detection unit (5) is configured to detect the temperature inside of the battery pack (1) based on the state of the output signal from the signal output circuit (6, D2). |
