Electrical energy storage device and method for producing an electrical energy storage device

1. An electrical energy storage device ( 1 ) comprising

a plurality of capacitors ( 2 ), and

a busbar ( 5 ) for electric power distribution,

wherein the busbar ( 5 ) is covered at least partially by an insulation layer ( 21 ) and the capacitors ( 2 ) are connected to the busbar ( 5 ),

wherein for reducing an inductance of the energy storage device, the capacitors ( 2 ) are arranged directly on the insulation layer ( 21 ) of the busbar ( 5 ); and

wherein at least one of said capacitors ( 2 ) is free from an insulation wrap.

2. The electrical energy storage device ( 1 ) according to claim 1 , wherein the plurality of capacitors ( 2 ) comprises a plurality of uninsulated capacitors that are free from an insulation wrap.

3. The electrical energy storage device ( 1 ) according to claim 2 , wherein the respective uninsulated capacitors are separated from each other by a distance of 0.5 mm to 5 mm.

4. The electrical energy storage device ( 1 ) according to claim 1 , wherein the busbar ( 5 ) comprises a first conductive layer ( 31 ) and a second conductive layer ( 32 ), wherein the first conductive layer ( 31 ) and the second conductive layer ( 32 ) are insulated from each other by a further insulation layer ( 22 ).

5. The electrical energy storage device ( 1 ) according to claim 4 , wherein the capacitors ( 2 ) are connected to the first conductive layer ( 31 ) and/or the second conductive layer ( 32 ) by reaching through the insulation layer ( 21 ).

6. The electrical energy storage device ( 1 ) according to claim 4 , wherein the capacitors ( 2 ) are connected to the first conductive layer ( 31 ) and/or the second conductive layer ( 32 ) by a connection means ( 8 ).

7. The electrical energy storage device ( 1 ) according to claim 6 , wherein the connector means ( 8 ) is configured such that for fixing the capacitors ( 2 ) in an assembled state a clamping force affects the capacitors ( 2 ).

8. The electrical energy storage device ( 1 ) according to claim 4 , wherein a first set of capacitors ( 2 ) is arranged in the first row ( 41 ) and a second set of capacitors ( 2 ) is arranged in the second row ( 42 ), wherein

the first set of capacitors ( 2 ) and the second set of capacitors ( 2 ) are connected to the first conductive layer ( 31 ) by a common connector means ( 8 ),

the first set of capacitors ( 2 ) is connected to the first conductive layer ( 31 ) by a connection means ( 8 ) and the second set of capacitors ( 2 ) is connected to the first conductive layer ( 31 ) by a further connection means ( 8 ′) and/or

the capacitors ( 2 ) of the first set of capacitors ( 2 ) and the capacitors ( 2 ) of the second set of capacitors ( 2 ) are each connected to the first conductive layer ( 31 ) by the connection means ( 8 ) or the further connection means ( 8 ′), individually.

9. The electrical energy storage device ( 1 ) according to claim 8 , wherein the further connection means ( 8 ′) reaches through the insulation layer ( 21 ) and/or a further insulation layer ( 22 ).

10. The electrical energy storage device ( 1 ) according to claim 1 , wherein the capacitors ( 2 ), being arranged next to each other on the busbar ( 5 ), are connected in series and/or in parallel to produce a capacitor bank.

11. The electrical energy storage device ( 1 ) according to claim 1 , wherein the capacitors ( 2 ) comprise a positive contact ( 11 ) and a negative contact ( 12 ), wherein the capacitors ( 2 ) are orientated such that

all negative contacts ( 12 ) or all positive contacts ( 11 ) face away from the busbar ( 5 ),

all negative contacts ( 12 ) facing away from the busbar ( 5 ) are located in a first row ( 41 ) and all positive contacts ( 11 ) facing away from the busbar ( 5 ) are located in a second row ( 42 ) or

a negative contact ( 12 ) of a first capacitor ( 2 ) facing away from the busbar ( 5 ) is located adjacent to a positive contact ( 11 ) of a neighbouring capacitor ( 2 ) facing away from the busbar ( 5 ) in the first row ( 41 ) and/or the second row ( 42 ).

12. The electrical energy storage device ( 1 ) according to claim 1 , wherein the capacitors ( 2 ) comprise at least one of

a metallized film that is wound;

a dielectric comprising at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulphide (PPS), polypropylene (PP), polycarbonate (PC) and the like; and

a positive contact ( 11 ) and a negative contact ( 12 ) made from metal being sprayed.

13. A method for producing the electrical energy storage device ( 1 ) according to claim 1 , comprising the steps:

providing the busbar ( 5 ),

covering the busbar ( 5 ) at least partially by an insulation layer ( 21 ),

arranging the plurality of capacitors ( 2 ) on the insulation layer ( 21 ) and

connecting the capacitors ( 2 ) to the busbar ( 5 ).

14. The method according to claim 13 , wherein the capacitors ( 2 ) are orientated on the busbar ( 5 ) such that the total inductance of the capacitors ( 2 ) is minimalized.

15. The method according to claim 13 , wherein the capacitors ( 2 ) are located at an edge ( 7 ) or rim of the busbar ( 5 ).

16. The method according to claim 13 , wherein the electrical energy storage device ( 1 ) is arranged at least partially in a casing.