Storage for electric cable

1. An electric connection system, comprising:

a helical electric cable having a spring effect; and

a cable storage device, defining a cable housing space and comprising at least one first cable guiding pulley, the first pulley being arranged on a horizontal axis and so that, on storage of the cable in the device, the cable is both pulled back by its spring effect and pulled down by the weight of the cable portion present under the first pulley, the cable storage device further comprising a housing defining the cable housing space extending below the first pulley.

2. The system of claim 1 , wherein the first pulley is rotatably mobile around an approximately horizontal shaft.

3. The system of claim 1 , wherein the first pulley comprises an external peripheral groove having a width, greater than the external diameter of the cable helix.

4. The system of claim 1 , wherein the first pulley and/or the storage device pivot around a vertical axis.

5. The system of claim 1 , wherein:

a first end of the cable is fixed with respect to the storage device; and

a second end of the cable is flee and comes out of a case of the storage device through an opening approximately tangentially to the first pulley.

6. The system of claim 1 , comprising at least one second pulley rotatably mobile around an approximately horizontal shaft, a shaft of the first pulley being higher than the shaft of the second pulley and the pulleys rotating, driven by the cable, in opposite or identical directions.

7. The system of claim 6 , wherein:

a first end of the cable is fixed with respect to the storage device; and

a second end of the cable is free and comes out of a case of the storage device through an opening approximately tangentially to the first pulley, and

wherein the vertical position of the fixed end of the cable is between the shafts of the two pulleys.

8. The system of claim 6 , wherein the second pulley is approximately vertically mobile in translation.

9. The system of claim 8 , wherein a spring pulls the second pulley back downwards.

10. The system of claim 6 , comprising a plurality of first pulleys and a plurality of second pulleys, the cable successively running from a first pulley to a second pulley from its first fixed end to the opening.

11. The system of claim 1 , wherein the cable has a deployed length in the range from approximately 4 meters to approximately 9 meters and a relaxed length in the range from approximately 0.8 meter to approximately 1.5 meters.

12. The system of claim 1 , wherein the cable has a cross-section in the range from approximately, 0.5 cm 2 to approximately 1.5 cm 2 , the diameter of the helix formed by the relaxed cable being in the range from approximately 4 cm to approximately 8 cm.

13. The system of claim 1 , intended for the charging of an electric vehicle battery.