Method for Producing an Electrode

Abstract

A method for producing an electrode, especially for a lithium-ion battery, includes coating a carrier material, machining the carrier material to produce at least one single sheet, and adjusting the porosity of the electrode at the single sheet level.

Claims

1-15. (canceled)

16. A method for producing an electrode for an energy storage cell, comprising: coating a carrier material; processing the carrier material in order to produce at least one single sheet; and adjusting a porosity of the electrode on the single sheet.

17. The method according to claim 16, comprising: processing by cutting out or trimming by means of a thermal or mechanical cutting method.

18. The method according to claim 16, wherein the carrier material is coated only locally, and wherein the method further comprises: processing the carrier material along the coated regions.

19. The method according to claim 16, comprising: forming a lead region during the processing of the carrier material.

20. The method according to claim 16, comprising: shaping a lead region after the adjustment of the porosity.

21. The method according to claim 16, comprising: adjusting the porosity by pressing and/or rolling.

22. The method according to claim 21, comprising: rolling along different directions.

23. The method according to claim 16, comprising: moving the single sheets by means of suction pads.

24. The method according to claim 16, comprising: moving or transporting the single sheets by means of transport films.

25. The method according to claim 16, comprising: recutting the single sheet after the adjustment of the porosity.

26. The method according to claim 16, comprising: coating the single sheet by a method selected from at least one of the following: lamination, adhesive bonding, masking, extrusion, dry coating, wet coating, or direct wet coating.

27. An electrode, comprising: a carrier material that has single sheet dimensions, wherein the carrier material has a coating which is uncompacted.

28. An electrode stack comprising a plurality of electrodes arranged in the form of a stack, produced by the method according to claim 16.

29. An energy storage unit comprising the electrode stack according to claim 28.

30. A traction battery comprising the energy storage unit according to claim 29.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG. 1 shows a schematic representation of one embodiment of a method sequence according to the invention for producing an electrode; and

[0052] FIG. 2 shows a schematic representation of an alternative method sequence according to one embodiment of the method according to the invention.

DETAILED DESCRIPTION

[0053] FIG. 1 shows on the left two embodiments of carrier materials or carrier films 10, which extend along a web direction B. The upper variant is coated in the shape of a strip, cf. the reference 22, and the lower variant is coated in the shape of a strip and intermittently along the web direction B. The uncoated regions are outlined with the reference 26. Compacting has not yet been carried out, that is to say a porosity of the electrode has not yet been adjusted. Expediently, single sheets are produced from such carrier materials 10, cf. the reference 20. In the embodiment represented here, a lead region 24 is in this case automatically formed jointly. The adjustment of the porosity of the electrode(s), or the compacting or pressing, do not take place until in a subsequent step, that is to say advantageously directly on the single sheet 20. The references W1 and W2 denote by way of example two rolling directions. Compacting along different directions increases the process stability, since any deformations can be compensated for optimally. After the pressing or compacting of the electrodes, recutting of the single sheet 20 to net shape is optionally carried out in a final step. This step may also be omitted however, depending on the embodiment. For the case in which the lead region 24 is coated, it may likewise be exposed subsequently.

[0054] FIG. 2 shows an alternative embodiment of a method for producing an electrode, the essential steps being known from FIG. 1. One crucial difference is that a lead region 24 is not already jointly produced when producing a single sheet 20 from a carrier film 10. Instead, the lead region 24 is not produced until in a final processing step. The single sheet 20 initially has strip-shaped uncoated regions 26. These may advantageously be used to handle the single sheet 20 better in the process. In this case, the uncoated regions 26 are configured to be so small that no folds, cracks or the like occur during the pressing, compacting or calendering.

List of References

[0055] TABLE-US-00001 10 carrier material, carrier film 20 single sheet 22 coating, coating compound 24 lead region 26 uncoated region W1 first rolling direction W2 second rolling direction B web direction