Backpack-Type Power Supply

1 . A backpack-type power supply comprising:

a plurality of secondary battery cells;

a case configured to accommodate the plurality of secondary battery cells and adapted to be worn on a user's back; and

a cooling fan configured to cool the plurality of secondary battery cells.

2 . The backpack-type power supply according to claim 1 , wherein the plurality of secondary battery cells is arrayed in a first direction to form a plurality of battery units, the plurality of battery units being arrayed in a second direction perpendicular to the first direction.

3 . The backpack-type power supply according to claim 2 , wherein the plurality of battery units is independently detachable from and attachable to the case.

4 . The backpack-type power supply according to claim 2 , wherein the plurality of secondary battery cells in each of the plurality of battery units is connected to one another in series, and the plurality of battery units is connected to one another in parallel.

5 . The backpack-type power supply according to claim 2 , wherein the cooling fan comprises a plurality of fans disposed in one-to-one correspondence with the plurality of battery units,

the backpack-type power supply further comprising:

a plurality of temperature sensors each configured to detect a temperature of corresponding one of the plurality of battery units; and

a control unit configured to control each of the plurality of fans independently of one another based on the temperatures detected by the plurality of temperature sensors.

6 . The backpack-type power supply according to claim 5 , wherein the control unit is configured to control each of the plurality of fans independently such that a difference in the temperatures among the plurality of battery units remains within a prescribed range.

7 . The backpack-type power supply according to claim 5 , wherein the control unit is configured to halt a specific one of the plurality of fans corresponding to a specific one of the battery units having a lowest temperature among the temperatures of the plurality of battery units.

8 . The backpack-type power supply according to claim 5 , wherein the control unit is configured to drive a specific one of the plurality of fans corresponding to a specific one of the battery units having a highest temperature among the temperature of the plurality of the battery units.

9 . The backpack-type power supply according to claim 5 , wherein each battery unit has a first end and a second end opposite to the first end in the first direction, the plurality of fans being disposed at the first end and the second end alternately in the second direction.

10 . The backpack-type power supply according to claim 2 , wherein the case has an outer wall, an inner wall opposite to the outer wall and configured to be rested at a user's back, and a pair of side walls each connecting the outer wall to the inner wall, a direction from the outer wall to the inner wall being a third direction perpendicular to the first direction and the second direction, and

wherein a combination of the plurality of battery units define a center in the first direction, the second direction, and the third direction; and

wherein one of the outer wall, the inner wall, and the side walls is formed with an opening at a position corresponding to the center, the opening being at least one of an air inlet opening and an air outlet opening for establishing an air flow flowing through the center by the cooling fan.

11 . The backpack-type power supply according to claim 2 , wherein the case has a pair of side walls each confronting each end of each of the plurality of battery units in the first direction, and has a bottom wall facing an endmost battery unit in the second direction, one of the side walls and the bottom wall being formed with at least one of an inlet opening and an outlet opening for establishing an airflow by the cooling fan.

12 . The backpack-type power supply according to claim 2 , wherein the case has a wall that rests against the user's back, the wall being formed with at least one of an inlet opening and an outlet opening for establishing an airflow by the cooling fan.

13 . The backpack-type power supply according to claim 2 , wherein the case has a wall that rests against the user's back, the wall and the plurality of battery cells defining therebetween a space serving as an air passage extending to or from the cooling fan.

14 . The backpack-type power supply according to claim claim 2 , wherein the plurality of battery units defines a center in the first direction and in the second direction; and

wherein the plurality of battery cells in each battery unit provides first gaps in the first direction between neighboring cells, and the plurality of battery units provide second gaps in the second direction between neighboring battery units, at least one of the first gaps and the second gaps being increased toward the center such that a specific one of the first gap and the second gap located closest to the center is the largest, and another specific one of the first gap and the second gap located farthest from the center is the smallest.

15 . The backpack-type power supply according to claim 2 , further comprising a plurality of heat distribution control members each disposed between the neighboring battery units and configured to control heat distribution among the plurality of battery units.

16 . The backpack-type power supply according to claim 15 , wherein the heat distribution control member comprises a partition plate configured to partially partition a space between the neighboring battery units.

17 . The backpack-type power supply according to claim 15 , wherein the heat distribution control member is made of a thermally insulating material.

18 . The backpack-type power supply according to claim 1 , wherein the secondary battery cells are lithium-ion secondary battery cells.