Production of metal-based thin foils

Patent metadata

Field	Value
Publication number	US-11890659-B2
Application number	US-201916406266-A
Country	US
Kind code	B2
Filing date	May 8, 2019
Priority date	Nov 9, 2016
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A method for producing metal-based thin foils is provided, which includes the steps of extruding a metal through an extruder to form a preliminary foil, cooling the preliminary foil in a coolant bath, and rolling the preliminary foil in a rolling system containing at least two rollers to form a metal-based thin foil.

First claim

What is claimed is:

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.

2. The process according to claim 1 , wherein the thin metal-based foil is a foil selected from the group consisting of an alkali metal, an alkaline earth metal, an alloy of alkali metal and an alloy of alkaline earth metal.

3. The process according to claim 2 , wherein the thin metal-based foil is a lithium-based foil.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Andre Dave
• Antonopoulos Byron Konstantinos
• Schneider Saskia
• Schuenemann Dennis
• Stiaszny Barbara
• Zugmann Sandra

Classifications

• B21B1/40 Primary

  for rolling foils which present special problems, e.g. because of thinness · CPC title

• B21C23/002

  Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences · CPC title

• B21C23/06

  Making sheets · CPC title

• B21C35/023

  Work treatment directly following extrusion, e.g. further deformation or surface treatment  (B21C35/03 takes precedence; gas treatment B21C23/009) · CPC title

• C22F1/16 Primary

  of other metals or alloys based thereon · CPC title