Battery pack

A battery pack, comprising:

• an assembled battery;
• and
• a flexible printed circuit board arranged along the assembled battery and configured to detect a voltage and a temperature of the assembled battery, wherein
• the flexible printed circuit board includes:
• a substrate having a front surface and a back surface;
• a thermistor which detects the temperature of the assembled battery;
• temperature detection lines electrically connected to the thermistor and arranged between the back surface and the assembled battery;
• and
• voltage detection lines arranged on the front surface to overlap the temperature detection lines in a case that the flexible printed circuit board is observed in a plane view in a transmissive manner from the back surface to the front surface, and
• a wiring pattern of the temperature detection lines and a wiring pattern of the voltage detection lines are substantially the same so that the voltage detection lines function as shield lines which electrically shield the temperature detection lines and improve noise resistance of the temperature detection lines.