Battery electrode and method for producing same
In order to allow for maximum freedom of design in the selection of an electrode or battery shape, a compact configuration and low production costs, the invention specifies a battery electrode and a method for producing same, wherein a collector substrate is coated with a coating film and at least one arrester region is produced thereon by removing the coating film by means of laser ablation.
1. A method for producing a battery electrode, the method comprising:
continuously applying a coating film onto a first side of a metal collector substrate over a large surface area in a uniform thickness, the metal collector substrate being a bulk or rolled material, the coating film including graphite, binder, carbon black and solvent, and wherein the coating film fully covers and coats the first side of the metal collector substrate,
then, drying and curing the metal collector substrate having the coating film thereon;
then, calendering the metal collector substrate after the drying and curing step;
following the calendaring step, then forming at least one arrester region on the first side of the metal collector substrate and projecting into the battery electrode, the forming of the at least one arrestor region including:
removing the coating film and a surface layer on the first side of the metal collector substrate using laser ablation and controlling the penetration of a laser into the metal collector substrate to a desired depth of the surface layer of the metal collector substrate in the at least one arrester region, wherein an edge of the at least one arrestor region is surrounded by a covered region of the metal collector substrate having the coating film; and
cutting out at least one battery electrode in any desired form from the metal collector substrate having the at least one arrester region.
2. The method as claimed in claim 1 , further comprising applying the coating film on a second side of the metal collector substrate that is opposite the first side of the collector substrate.
3. The method as claimed in claim 2 , further comprising forming at least one arrester region on the second side of the metal collector substrate, including removing the coating film on the second side of the metal collector substrate using laser ablation.
4. The method as claimed in claim 1 , further comprising contacting the at least one arrester region on the first side of the metal collector substrate using a connection lug immediately after forming the at least one arrester region.
5. The method as claimed in claim 4 , further comprising laser cutting the battery electrode, a cutout region, or both, in which the cutout region is a cutout of the coating film and the metal collector substrate, wherein the cutout region corresponds to the at least one arrester region.
6. The method as claimed in claim 1 , further comprising forming the at least one arrester region on the first side of the metal collector substrate in a round, annular, rectangular, or triangular shape or as a cutout therefrom.
7. The method as claimed in claim 5 , further comprising blowing a process gas onto the first side of the metal collector substrate during the step of using laser ablation or during the step of laser cutting.
8. A battery electrode made in accordance with the method of claim 1 .
9. A battery comprising: a battery electrode made in accordance with the method of claim 1 .
10. The method as claimed in claim 2 , wherein the step of applying the coating film on the first side or the second side of the metal collector substrate comprises using a continuous coating technology.
11. The method as claimed in claim 3 , wherein the step of removing the coating film on the second side of the metal collector substrate includes removing a layer of the second side of the metal collector substrate using laser ablation in the at least one arrester region, thereby forming a clean surface free of impurities and oxidized layers.
12. The method as claimed in claim 11 , further comprising contacting the at least one arrester region on the second side of the collector substrate using a connection lug immediately after forming the at least one arrester region.
13. The method as claimed in claim 12 , further comprising laser cutting the battery electrode, a cutout region, or both, wherein the cutout region is a cutout of the coating film and the metal collector substrate, wherein the cutout region corresponds to the at least one arrester region.
14. The method as claimed in claim 2 , further comprising forming the battery electrode in the metal collector substrate as a round, annular, rectangular, triangular shape or as a cutout therefrom.
15. The method as claimed in claim 13 , further comprising blowing a process gas onto the second side of the metal collector substrate during the step of using laser ablation or during the step of laser cutting.