Power source device

1. A power source device comprising:

a plurality of battery cells respectively having electrode terminals;

a rigid circuit board including a detection circuit for detecting states in the plurality of the battery cells;

a flexible printed circuit board electrically connecting the electrode terminals and the detection circuit; and

a connecting member provided at a tip of the flexible printed circuit board, and electrically connecting the plurality of the battery cells and the flexible printed circuit board,

wherein the flexible printed circuit board has a plurality of fixing portions fixed to the rigid circuit board,

wherein the plurality of the fixing portions include: a signal line connecting portion having a plurality of conductive foils of which one side ends are fixed to the rigid circuit board, and which electrically connect the electrode terminals and the detection circuit; and one or more of reinforcing portions having a fixing metal foil of which one side end is fixed to the rigid circuit board, and which is insulated from the electrode terminals,

wherein the signal line connecting portion have a connecting area overlapping the rigid circuit board,

wherein the power source device further comprises:

a reinforcing pad extending in a direction perpendicular to an extending direction of the plurality of the conductive foils within the connecting area.

2. The power source device according to claim 1 ,

further comprising:

a battery block having a rectangular parallelepiped shape, and including the plurality of the battery cells,

wherein the rigid circuit board is disposed so as to face one surface of the battery block.

3. The power source device according to claim 1 ,

wherein in the connecting area, the rigid circuit board is positioned between the flexible printed circuit board and the plurality of the battery cells.

4. The power source device according to claims claim 1 ,

wherein the plurality of the conductive foils and the fixing metal foil are fixed to the rigid circuit board through solder.

5. The power source device according to claim 4 ,

wherein another fixing metal foil is provided at the signal line connecting portion,

the reinforcing pad is configured of a solder welded to the another fixing metal foil at the signal line connecting portion.

6. The power source device according to claim 1 ,

wherein the rigid circuit board has a rectangular shape in a plan view,

the plurality of the fixing portions are disposed in parallel along a long side of the rigid circuit board.

7. The power source device according to claim 6 ,

further comprising a plurality of the reinforcing portions,

wherein the signal line connecting portion is disposed between the plurality of the reinforcing portions disposed in parallel along the long side of the rigid circuit board.

8. The power source device according to claim 6 ,

wherein the plurality of the battery cells are disposed to be stacked so as to make a plurality of terminal lines and,

the rigid circuit board is disposed between the plurality of the terminal lines such that the long side of the rigid circuit board is along an arrangement direction of the plurality of the terminal lines.

9. The power source device according to claim 6 ,

further comprising:

a plurality of bus-bars electrically connecting the electrode terminals each other of the plurality of the battery cells,

wherein the connecting members are a plurality of tabs welded to the bus-bars.