US 12,266,779 B2
Method for the production of an electrode powder mixture for a battery cell
Sven Schopf, Braunschweig (DE); Alba Tunas Cantorna, Braunschweig (DE); Bastian Westphal, Sickte (DE); and Malte Meitz, Hildesheim (DE)
Assigned to VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg (DE)
Filed by VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg (DE)
Filed on Dec. 23, 2021, as Appl. No. 17/560,600.
Claims priority of application No. 10 2020 216 546.7 (DE), filed on Dec. 23, 2020.
Prior Publication US 2022/0199963 A1, Jun. 23, 2022
Int. Cl. H01M 4/04 (2006.01); H01M 4/139 (2010.01); H01M 4/62 (2006.01)
CPC H01M 4/0411 (2013.01) [H01M 4/04 (2013.01); H01M 4/623 (2013.01); H01M 4/139 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for the production of an electrode powder mixture for a battery cell, comprising:
filling an active material, a binder and a conductive additive into a filling section of a machine that has a first driven screw which extends in a lengthwise direction and which serves for thoroughly blending and conveying a powder in the lengthwise direction,
using the first screw, blending the binder, the active material and the conductive additive in order to form a first powder in a first section of the machine, wherein the binder, the active material and the conductive additive are homogenized by a first grinder having a plurality of teeth,
conveying the first powder from the first section to a second section by means of the first screw,
using the first screw, forming a second powder out of the first powder in the second section of the machine, wherein the binder is fibrillated, wherein during fibrillation the binder is drawn in order to create individual fibers so that the binder is present in the second powder in the form of fibers or clusters, whereby the second powder contains several such fibers,
conveying the second powder to a third section by means of the first screw,
using the first screw, producing the electrode powder mixture out of the second powder in the third section of the machine, wherein the fibrillated binder is comminuted using a second grinder having a plurality of teeth, wherein the second grinder has fewer teeth than the first grinder, such that individual fibers present in the second powder are disaggregated so that each has a certain length, and
removing the electrode powder mixture from the machine at a removal opening, wherein the removal opening is at a distance from the filling section in the lengthwise direction.