US 11,890,659 B2
Production of metal-based thin foils
Dave Andre, Munich (DE); Byron Konstantinos Antonopoulos, Munich (DE); Saskia Schneider, Munich (DE); Dennis Schuenemann, Mauern (DE); Barbara Stiaszny, Obergriesbach (DE); and Sandra Zugmann, Garching (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed on May 8, 2019, as Appl. No. 16/406,266.
Application 16/406,266 is a continuation of application No. PCT/EP2017/076142, filed on Oct. 13, 2017.
Claims priority of application No. 10 2016 222 004.7 (DE), filed on Nov. 9, 2016.
Prior Publication US 2019/0262878 A1, Aug. 29, 2019
Int. Cl. B21B 1/40 (2006.01); B21C 23/00 (2006.01); B21C 23/06 (2006.01); B21C 35/02 (2006.01); H01M 4/04 (2006.01); H01M 4/40 (2006.01); H01M 10/04 (2006.01); C22F 1/16 (2006.01); H01M 4/38 (2006.01); H01M 10/00 (2006.01); H01M 10/0525 (2010.01)
CPC B21B 1/40 (2013.01) [B21C 23/002 (2013.01); B21C 23/06 (2013.01); B21C 35/023 (2013.01); C22F 1/16 (2013.01); H01M 4/0435 (2013.01); H01M 4/38 (2013.01); H01M 4/405 (2013.01); H01M 10/00 (2013.01); H01M 10/04 (2013.01); H01M 10/0525 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A process for the production of thin metal-based foils, comprising the acts of:
providing an extruder, a coolant bath, and a rolling system comprising at least two rollers;
extruding a metal through the extruder to form a preliminary foil, wherein the preliminary foil has a thickness from 100 to 150 μm;
cooling the preliminary foil in the coolant bath containing liquid nitrogen at a temperature between 63 K and 77 K; and
then rolling the preliminary foil at least once in the rolling system comprising at least two rollers to form a thin metal-based foil with a thickness from 5 to 80 μm, wherein during rolling, the preliminary foil is kept below its tear threshold by increasing the temperature of the center of the foil,
wherein the rolling system is cooled by the same coolant used in the coolant bath, and wherein the rolling system is not immersed in the coolant bath.