Method and device for cutting a multilayer assembly composed of a plurality of thin films and comprising a thin film electrochemical generator or a component part thereof
First Claim
1. A process for carrying out the cutting, to a desired shape, of a multilayer assembly selected from the group consisting of a thin layer electrochemical generator and a constituent part of such a generator, said multilayer assembly comprising a plurality of thin layers at least one of which is selected from the group consisting of a metal ribbon and a macromolecular material containing layer, said process comprising the steps of:
- focusing at least one laser beam on a face of the assembly to be cut, at a point on said cancelled face lying on the outline to be cut and termed point of impact and said beam on said face, so as to provide at said point a disintegration of the material of said assembly;
driving the laser beam in a relative movement with respect to the assembly to be cut such that said point of impact describes a trajectory corresponding to the outline to be cut out, while maintaining a controlled atmosphere in a zone surrounding said point of impact; and
selecting as the controlled atmosphere a reactive atmosphere which reacts with at least one of the components of the multilayer assembly in order to form a protective layer on a slice of the cut part of the assembly.
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Abstract
At least one laser beam is focused on one side of an assembly to be cut at a point on the side which is part of the cutting profile and which is called the point of impact of the beam on side side, in order to cause at that point a disintegration of the material of the assembly. The laser beam is moved in relation to the assembly so that the impact point describes a trajectory which corresponds to the desired cutting profile, while maintaining a controlled atmosphere in the area around the impact point. Uses particularly include cutting solid polymer electrolyte lithium thin film electrochemical generators, or cutting precursors of such generators.
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Citations
20 Claims
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1. A process for carrying out the cutting, to a desired shape, of a multilayer assembly selected from the group consisting of a thin layer electrochemical generator and a constituent part of such a generator, said multilayer assembly comprising a plurality of thin layers at least one of which is selected from the group consisting of a metal ribbon and a macromolecular material containing layer, said process comprising the steps of:
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focusing at least one laser beam on a face of the assembly to be cut, at a point on said cancelled face lying on the outline to be cut and termed point of impact and said beam on said face, so as to provide at said point a disintegration of the material of said assembly; driving the laser beam in a relative movement with respect to the assembly to be cut such that said point of impact describes a trajectory corresponding to the outline to be cut out, while maintaining a controlled atmosphere in a zone surrounding said point of impact; and selecting as the controlled atmosphere a reactive atmosphere which reacts with at least one of the components of the multilayer assembly in order to form a protective layer on a slice of the cut part of the assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for carrying out the cutting, to a desired shape, of a multilayer assembly selected from the group consisting of a lithium-based thin layer electrochemical generator containing solid polymer electrolyte and a lithium-containing precursor of such a generator, said process comprising the steps of:
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focusing at least one laser beam on a face of the assembly to be cut, at a point on said face lying on the outline to be cut and termed point of impact of said beam of said face, so as to provide at said point of disintegration of the material of said assembly; driving the laser beam in a relative movement with respect to the assembly to be cut such that said point of impact describes a trajectory corresponding to the outline to be cut out, while maintaining a controlled atmosphere in a zone surrounding said point of impact; and selecting as the controlled atmosphere a reactive atmosphere consisting in total or in part of CO2, which reacts with the lithium in the multilayer assembly at the point of cutting to form a protective layer of electrochemically inert lithium carbonate on a slice of the cut part of the assembly. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification