NOVELTY - The device comprises a laser light source (1) that provides a laser beam (8), and an optical element for beam splitting (2) that produces a laser cutting beam (9) and a laser heating beam (10). An optical element for beam deflection (3) deflects the laser cutting beam or laser heating beam. An optical element for expanding (13) expands the laser cutting beam and/or defocuses the laser heating beam and An optical element configured for beam superposition (5) performs beam superposition of the laser cutting beam and the laser heating beam.    USE - Device for cutting electrode foils and/or separator foils for electrochemical energy storage such as secondary battery e.g. lithium ion battery for portable electronic device for use in field of consumer electronics such as mobile phones, laptops and tablet personal computers, tools such as drills and flashlights, kitchen appliances, and electric vehicle. Uses include but are not limited to nickel-cadmium battery, nickel metal hydride battery, lithium cobalt dioxide battery, lithium-polymer battery, lithium manganese battery, lithium iron phosphate battery, lithium-sulfur battery, and lithium titanate battery.    ADVANTAGE - The formation of particles on the surface of the material to be cut electrode foils and the separator foils is reduced or avoided during laser cutting of the electrode foils and/or the separator foils. The energy density and the power density of the laser beam on the object to be cut are as high as possible. The necessary residence time is reduced for cutting of the laser to a point and the cutting speed is increased.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of laser cutting of the electrode foils and/or separator foils for the electrochemical energy storage.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the beam profile of laser beam.    Laser light source (1)    Optical element for beam splitting (2)    Optical element for beam deflection (3)    Optical element for beam superposition (5)    Laser beam (8)    Laser cutting beam (9)    Laser heating beam (10)    Optical element for expanding (13)