Method for cutting an electrode of an electrochemical generator

Patent metadata

Field	Value
Publication number	US-10601028-B2
Application number	US-201615093898-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Apr 9, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A method for cutting an electrode of an electrochemical generator including a metal sheet with a laser beam of a power lower than or equal to 600 W, one face of the metal sheet being partially coated with a thinly layered band called the cutting band, the optical absorption factor of which for an emission wavelength of the laser beam is higher than or equal to 0.5 and preferably higher than or equal to 0.8, and extends so as to define a cutting path, in which the laser beam is focused on the cutting band and the laser beam is animated with a relative movement with respect to the electrode so as to travel the cutting path.

First claim

The invention claimed is:

1. A method for cutting an electrode of an electrochemical generator comprising a metal sheet with a laser beam of a power lower than or equal to 600 W, comprising:
partially coating one face of the metal sheet with a thin layer band being a cutting band, the optical absorption factor of which, for an emission wavelength of said laser beam, being higher than or equal to 0.5, said cutting band extending over said face to define a cutting path, said face of the metal sheet being partially coated with a thin layer being an active layer, which is adapted to react electrochemically during operation of the generator, said cutting band extending at least partially around the active layer, and being located, on at least one section of the cutting path, away from the active layer; and
focusing the laser beam on the cutting band and moving the laser beam with a relative movement with respect to the electrode to travel along said cutting path.

2. The cutting method according to claim 1 , wherein the cutting band is made of one or more materials, at least one material of which is the same as one or more materials of the active layer.

3. The cutting method according to claim 2 , wherein the active layer is produced from a mixture of a plurality of the one or more materials of the active layer, including an electrochemically active material, the cutting band being produced from a mixture of the same materials as those of the active layer, with a proportion by weight of the active material of the cutting band lower than a proportion by weight of the active material in the mixture of the active layer.

4. The cutting method according to claim 1 , wherein the active layer comprises a carbon-containing component or a component based on lithiated metal oxide or comprises the carbon-containing component and the component based on lithiated metal oxide.

5. The cutting method according to claim 1 , wherein the cutting band comprises a carbon-containing component or a component based on lithiated metal oxide or comprises the carbon-containing component and the component based on lithiated metal oxide.

6. The cutting method according to claim 1 , wherein the metal sheet is produced from aluminium or copper or nickel or stainless steel.

7. The method according to claim 1 , wherein the optical absorption factor is higher than or equal to 0.8.

8. A method for producing an electrode for an electrochemical generator comprising:
depositing a thin layer band being a cutting band, the optical absorption factor of which, for a given wavelength range which is an emission wavelength of a laser beam, being higher than or equal to 0.5 on a portion of one face of a metal sheet of the electrode, said cutting band extending over said face to define a cutting path;
depositing a thin layer being an active layer, which is adapted to react electrochemically during operation of the generator, on said face of the metal sheet, said cutting band extending at least partially around the active layer and being located, on at least one section of the cutting path, away from the active layer; and
cutting said electrode with the laser beam of a power lower than or equal to 600 W, the cutting including:
focusing the laser beam on the cutting band and moving the laser beam with a relative movement with respect to the electrode to travel along said cutting path.

9. The method for producing an electrode according to claim 8 , wherein the steps of depositing the active layer and cutting band on said face of the metal sheet are carried out simultaneously.

10. The method for producing an electrode according to claim 9 , wherein the steps of depositing the active layer and cutting band on said face of the metal sheet are carried out by screen printing.

Assignees

• Commissariat Energie Atomique

Inventors

• Barthe Benoit
• Salomon Jeremie
• Vincent Remi

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• B23K26/38

  by boring or cutting · CPC title

• B23K2103/10

  Aluminium or alloys thereof · CPC title

• H01M4/0471 Primary

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title