Battery monitoring module and flexible printed wiring board

A flexible printed wiring board attached to a battery, comprising:

• a trunk portion;
• a first branch portion;
• a second branch portion;
• a bent portion;
• and
• multiple lines,
• wherein
• the multiple lines are provided only on one surface of the flexible printed wiring board, and include a first line group, a second line group, and a third line group,
• the first line group is arranged over the trunk portion, the first branch portion, and the bent portion,
• the second line group is arranged over the trunk portion and the second branch portion, the third line group is arranged at the trunk portion,
• one end of each line of the first line group is connected to a corresponding one of multiple terminals of the battery, and the other end of each line of the first line group is arranged in the bent portion,
• one end of each line of the second line group is connected to a corresponding one of the multiple terminals of the battery, and the other end of each line of the second line group is arranged at an end portion of the trunk portion in a longitudinal direction of the flexible printed wiring board,
• one end of each line of the third line group is arranged at the end portion of the trunk portion, and the other end of each line of the third line group is arranged in the trunk portion,
• the bent portion is bent to fold over the trunk portion such that the other end of each line of the first line group arranged in the bent portion and the other end of each line of the third line group arranged in the trunk portion are connected to each other, and
• the bent portion is positioned between the first branch portion and the second branch portion, and extends on an opposite side of the end of the trunk portion.