Electrically driven industrial vehicle

1. An industrial vehicle comprising:

a vehicle body provided on a traveling body;

an implement for receiving a hydraulic drive force, the implement being attached to said vehicle body; and

a hydraulic drive force generating unit for generating the hydraulic drive force for operating said implement, the hydraulic drive force generating unit being provided to said vehicle body;

wherein

said hydraulic drive force generating unit has a hydraulic fluid tank for storing hydraulic fluid; a hydraulic pump for feeding the hydraulic fluid in said hydraulic fluid tank to said implement; an electric motor for driving said hydraulic pump; and power storage means for feeding electric drive power to said electric motor;

said hydraulic pump, said electric motor, and said hydraulic fluid tank are disposed on a same plane inside said vehicle body and in a position lower than said power storage means; and

said power storage means is composed of at least one of a high-capacity secondary battery and a high-capacity capacitor.

2. The electrically driven industrial vehicle according to claim 1 , wherein said high-capacity secondary battery is composed of a lithium ion battery or an organic radical battery.

3. The electrically driven industrial vehicle according to claim 1 , wherein

a battery storage part is formed for storing said power storage means in said vehicle body; and

a battery storage opening that opens facing said battery storage part is formed in an external peripheral surface of said vehicle body, and said power storage means can be inserted into and withdrawn from said battery storage part through said battery storage opening.

4. The electrically driven industrial vehicle according to claim 1 , wherein said vehicle body is composed of a revolving body attached on said traveling body, the revolving body is adapted to turn horizontally via a revolving mechanism.

5. The electrically driven industrial vehicle according to claim 4 , wherein

at least a portion of an external peripheral surface of said revolving body is formed as a surface curved about an axis of revolution thereof;

the battery storage part is formed in a curved surface along said external peripheral surface inside said revolving body;

said power storage means is composed of a plurality of battery cells; and

said plurality of battery cells is arranged in a line along an external peripheral surface of said curved surface inside said battery storage part.

6. The electrically driven industrial vehicle according to claim 4 or 5 , wherein

said implement is attached to a front part of said revolving body; and

an external peripheral surface of a rear part of said revolving body is formed in a curved surface, said battery storage part is formed along the curved surface, and said power storage means accommodated in said battery storage part functions as a counterweight.

7. The electrically driven industrial vehicle according to claim 1 , wherein

said power storage means is composed of a plurality of electrically connected battery cells having mutually equal electrical capacities; and

said plurality of battery cells has equal surface areas and different shapes as viewed from above, is formed in columnar shapes having equal thickness dimensions, and is configured to have mutually equal volumes.

8. The electrically driven industrial vehicle according to claim 7 , wherein a battery storage part having a prescribed shape is formed within said vehicle body, and said plurality of battery cells is arranged compactly and efficiently as a combination of said plurality of different shapes in conformity to the shape of said battery storage part.

9. The electrically driven industrial vehicle according to claim 7 or 8 , wherein said plurality of battery cells is arranged in a plurality of tiers disposed one above another inside said battery storage part.

10. The industrial vehicle according to any of claims 1 through 4 , wherein

said power storage means is stored and disposed at a rear end side inside said vehicle body.