Device for cutting electrode foils

Patent metadata

Field	Value
Publication number	US-2026061653-A1
Application number	US-202519305913-A
Country	US
Kind code	A1
Filing date	Aug 21, 2025
Priority date	Aug 29, 2024
Publication date	Mar 5, 2026
Grant date	—

Abstract

A device for cutting a strip-shaped electrode foil into narrower strips has two parallel driven shafts and two pairs of circular blades that are attached to the shafts. An elastic element is arranged between the blades of one shaft and presses them against the blades on the other shaft. Each circular blade has a radially outwardly facing cylindrical outer surface and a flat annulus-shaped side surface that extends perpendicular to the respective axis of rotation and forms a circumferential cutting edge where it adjoins the outer surface. The cutting edges of the second circular blades have a similar construction, but face each other and are separated by a circumferential interspace. A non-destructively exchangeable spacer element is arranged between the two second circular blades, thereby determining the axial width of the interspace.

First claim

1 . A device for cutting a strip-shaped electrode foil into narrower strips, wherein the device comprises:
a first shaft; a second shaft extending parallel to the first shaft; a drive configured to set the first shaft and the second shaft in counter-rotation; a first pair of first circular blades that is attached to the first shaft in a rotationally fixed manner; a second pair of second circular blades that is attached to the second shaft in a rotationally fixed manner; and an elastic element that:
comprises an elastomer, a compression spring or a disk spring,
is arranged between the two first circular blades, and
exerts a pressure force on the first two circular blades that acts towards the adjacent second circular blades,
wherein each circular blade has a radially outwardly facing cylindrical outer surface and a flat annulus-shaped side surface that extends perpendicular to the respective axis of rotation and forms a circumferential cutting edge where it adjoins the outer surface, wherein the cutting edges of the second circular blades of the second pair face each other and are separated from each other by a circumferential interspace having an axial width, wherein the cutting edges of the first circular blades of the first pair face away from each other and engage in the circumferential interspace in such a way that adjacent first and second circular blades cooperate to produce a respective cutting edge in the electrode foil, and wherein a non-destructively exchangeable spacer element is arranged between the two second circular blades of the second pair, thereby determining the axial width of the circumferential interspace.

2 . The device of claim 1 , comprising an ejector ring extending through the circumferential interspace, wherein the ejector ring is rotatably mounted about an axis of rotation that is independent of and arranged eccentrically to the second shaft.

3 . The device of claim 2 , wherein the ejector ring is supported on two rotatably mounted rollers.

Assignees

• Varta Microbattery Gmbh

Inventors

• Barenthin Nils
• Gaugler Andreas
• Kienle Daniel

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• B26D1/245

  for thin material, e.g. for sheets, strips or the like · CPC title

• B23D35/007

  for circular cutting members · CPC title

• B23D19/06

  with several spaced pairs of shearing discs working simultaneously, e.g. for trimming or making strips · CPC title

• B26D7/265

  Journals, bearings or supports for positioning rollers or cylinders relatively to each other · CPC title