Power supply device

1. A power supply device comprising:

a battery cell assembly being an assembly of battery cells each having electrodes; and

a battery connecting block placed on a side of the battery cell assembly where the electrodes are located, the battery connecting block comprising a case body including an adjacent first and second divided fixing portions connected to each other in a first direction via a flexural deformation portion,

wherein the flexural deformation portion is substantially U-shaped and includes

a first rising linear portion having one end fixed to the first divided fixing portion,

a second rising linear portion having one end fixed to the second divided fixing portion,

first and second curve portions, and

a linear portion connecting the first and second curve portions to each other,

wherein the first curve portion bends at the other end of the first rising linear portion at a side of one surface of the linear portion and the second curve portion bends at the other end of the second rising linear portion at the side of the one surface of the linear portion,

wherein the flexural deformation portion comprises:

a first portion for connection between the first rising linear portion and the first divided fixing portion; and

a second portion for connection between the second rising linear portion and the second divided fixing portion,

wherein the first portion for connection comprises:

a first central portion located at a center of the first portion for connection in a second direction perpendicular to the first direction; and

a first set of reinforcement ribs located at both sides of the first central portion in the second direction, extending in the first direction, and having a thickness greater than a thickness of the first central portion, and

wherein the second portion for connection comprises:

a second central portion located at a center of the second portion for connection in the second direction; and

a second set of reinforcement ribs located at both sides of the second central portion in the second direction, extending in the first direction, and having a thickness greater than a thickness of the second central portion.

2. The power supply device according to claim 1 , wherein the first and second divided fixing portions are terminal fixing portions configured to fix terminals.

3. The power supply device according to claim 1 , wherein the first and second divided fixing portions are wire housing portions configured to house wires.

4. The power supply device according to claim 1 , wherein a stress caused by deformation of the flexural deformation portion is distributed to a plurality of locations on the flexural deformation portion.

5. The power supply device according to claim 4 , wherein the plurality of locations comprises a first location provided on the first curve portion and a second location provided on the second curve portion.

6. The power supply device according to claim 1 , wherein the linear portion has a length extending from the first curve portion to the second curve portion so as to separate the first curve portion from the second curve portion.

7. The power supply device according to claim 1 , wherein the linear portion is configured to refrain from deforming during deformation of the flexural deformation portion.

8. The power supply device according to claim 1 , wherein the flexural deformation portion is substantially U-shaped from the one end of the first rising linear portion to the one end of the second rising linear portion.

9. The power supply device according to claim 1 ,

wherein the first rising linear portion extends only to one side of the first divided fixing portion, and

wherein the second rising linear portion extends only to one side of the second divided fixing portion.