Method for the production of an electrode for a battery cell of an electrical energy storage device, electrode and generator

Abstract

A method for production of an electrode for a battery cell of an electrical energy storage device by a generator includes spraying an electrode powder onto a metallic substrate web by a spraying device of the generator and compressing the electrode powder onto the metallic substrate web by a stamping device of the generator. Before the spraying, the electrode powder is electrically charged by corona or tribological charging.

Claims

1. A method for production of an electrode (12) for a battery cell of an electrical energy storage device by a generator (10), comprising the steps of: spraying an electrode powder (18) received from a reservoir (30) onto a metallic substrate web (20) by a spraying device (14) of the generator (10); compressing the electrode powder (18) onto the metallic substrate web (20) by a stamping device (16) of the generator (10); before the spraying, electrically charging the electrode powder (18) by corona or tribological charging; removing uncompressed electrode powder (18) from the metallic substrate web (20) after the compressing by an air jet (28); and feeding the uncompressed electrode powder (18) after the removing into the reservoir (30).

2. The method according to claim 1, wherein the electrode powder (18) is sprayed onto both sides of the metallic substrate web (20).

3. The method according to claim 1, wherein a cathode material or an anode material is mixed dry with a binder and at least one additive to form the electrode powder (18).

4. The method according to claim 1, wherein the metallic substrate web (20) is earthed.

5. The method according to claim 1, wherein the electrode powder (18) is fluidized before the spraying.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The single FIGURE shows a schematic side view of an embodiment of a generator.

DETAILED DESCRIPTION OF THE DRAWING

(2) Identical or functionally identical elements are provided with the same reference signs in the FIGURE.

(3) The FIGURE shows a schematic side view of an embodiment of a generator 10. The generator 10 is designed to produce an electrode 12 for a battery cell (not depicted) of an electrical energy storage device (not depicted). The generator 10 has at least one spraying device 14 and a stamping device 16.

(4) In the method according to the invention for producing an electrode 12, it is provided that an electrode powder 18 is sprayed onto a metallic substrate web 20 by means of the spraying device 14. The electrode powder 18 is then compressed on the substrate web 20 by means of the stamping device 16.

(5) In the present exemplary embodiment, it is in particular shown that the substrate web 20 is unrolled or rolled up on two rollers 22, 24. In particular, the substrate web 20 is rolled up on the first roller 22, and the substrate web is unrolled with the electrode 12 or the electrodes 12 on the second roller 24. It is further shown that in the present exemplary embodiment, the second roller 24 is earthed via an earthing 26.

(6) The FIGURE further shows that the electrode powder 18 is in particular sprayed onto both sides of the metallic substrate web 20. It can further in particular be provided that the uncompressed electrode powder is removed from the metallic substrate web 20 by means of an air jet 28 after compression. In particular, the uncompressed electrode powder 18 can be re-used for a further spraying process. For this purpose, it can for example be provided that a reservoir 30 is provided, in which the electrode powder 18 is introduced or returned, in order then to be used for the spraying process in turn.

(7) The electrode powder 18 is in particular mixed dry from a cathode material or an anode material with binders and an additive. It can further be provided that the electrode powder 18 is electrically charged before spraying by means of corona or tribological charging 32. The electrode powder 18 is further fluidized before spraying.

(8) In particular, the invention thus provides that, after the electrode powder 18 is mixed together dry, the electrode powder goes through a roll-to-roll process in turn, wherein the mixed electrode powder 18 is sprayed onto one or both sides, i.e., it is then fluidized via a gas flow, and for example exits via a nozzle near the metallic substrate web 20. The electrode powder 18 itself is electrically charged either by means of corona or tribological charging. Meanwhile, the metallic substrate film is earthed. The electrode powder 18 is first layered onto the material in a disordered manner and without the required sharp contour edges. Directly afterwards, the electrode powder 18 is compressed with the substrate film by means of one or both sides of the stamp. On the other hand, the electrode powder 18 is only bound to the substrate film by electrostatic forces at the uncompressed points. At the end of the process, the uncompressed electrode powder 18 is then removed, for example by means of compressed air, and can then be fed back into the process. In this manner, the recovered electrode powder 18 can be re-used, which, in addition to energy saving, leads to a reduction in waste or offcuts, because only the compressed active material remains on the substrate film.