Surface treatment processes

Abstract

The invention relates to a method for surface treatment of a cylindrical housing (110) of an electrical energy storage device (100) made of metal by means of laser structuring, wherein the housing (110) has a housing shell (120) and an upper housing cover (111) surrounded by the housing shell (120) and a lower housing cover (112) surrounded by the housing shell (120), and the housing shell (120) is surface treated.According to the invention, during surface treatment, the housing (120) is guided in a holder (500) in a rotating manner such that a distance of a surface (130) of the housing shell (120) to a laser optics (200) emitting at least one laser beam (210) onto the surface (130), in particular a focus position of the laser optics (200), is kept constant and at least one structure (300, 310) is produced in the surface (130) surrounding the housing shell (120) by means of the at least one laser beam (210).

Description

[0001] The invention relates to a method for surface treatment of a cylindrical housing made of metal of an electrical energy storage device according to the preamble of claim 1.

[0002] From US 11 777 165 B2 a battery is known, comprising a battery casing made of metal, which has a tubular portion with an opening edge portion at a first end of the tubular portion and a bottom portion closing a second end of the tubular portion, having an electrode body located in the battery casing, an electrolyte solution filling the battery casing, and a sealing member having an outer peripheral surface facing an inner peripheral surface of the opening edge portion of the tubular portion and configured to seal the opening edge portion.

[0003] The invention is based on the object of providing an improved method for surface treatment of a cylindrical housing of an electrical energy storage device.

[0004] The object is achieved according to the invention by a method having the features of claim 1.

[0005] Advantageous embodiments of the invention are the subject of the subclaims.

[0006] In a method for surface treatment of a cylindrical housing of an electrical energy storage device made of metal by means of laser structuring, wherein the housing has a housing shell and an upper housing cover surrounded by the housing shell and a lower housing cover surrounded by the housing shell, the housing shell is surface treated.

[0007] According to the invention, during surface treatment, the housing is guided by means of a rotating holder in such a way that a distance of a surface of the housing shell to a laser optic emitting at least one laser beam onto the surface, in particular a focus position of the laser optic, is kept constant and at least one structure is produced in the surface, encircling the housing shell, by means of the at least one laser beam.

[0008] The present method enables adhesion optimization by creating the structure in the surface of the housing shell, so that, for example, a potting compound or an adhesive with improved adhesion to the housing can be applied.

[0009] By maintaining a constant distance between the surface of the housing shell and the focus position of the laser optics during laser structuring by means of the rotating holder, the energy input of the laser optics onto the surface of the housing is kept constant during the creation of the structure, whereby the created structure has a uniform texture on the surface.

[0010] Embodiments of the invention are explained in more detail below with reference to a drawing.

[0011] It shows: Fig. 1 a schematic representation of a device for surface treatment of an electrical energy storage device.

[0012] The only Fig. 1 shows a possible embodiment of a device 400 for carrying out a method for surface treatment of a cylindrical housing 110 of an electrical energy storage device 100 formed from metal by means of laser structuring.

[0013] The device 400 comprises a holder 500 and a laser device, of which only one laser optics 200 is shown. A laser beam 210 is coupled into the laser optics 200 by means of a laser emitter (not shown). The laser beam 210 is optically deflected and / or formed by the laser optics 200 and emitted toward the holder 500.

[0014] The electrical energy storage device 100 is, for example, a single cell and has the housing 110. The housing 110 has an upper housing cover 111, a lower housing cover 112, and a housing shell 120 with an outer surface 130. For example, the energy storage device 100 is a single cell for a traction battery of a vehicle.

[0015] The housing 110 is bounded on one side by the upper housing cover 111 and on a side opposite the upper housing cover 111 by the lower housing cover 112.

[0016] The housing shell 120 is formed so as to surround the housing covers 111, 112. At least the surface 130 of the housing shell 120 is made of a metal, for example, aluminum.

[0017] For surface treatment of the surface 130 of the housing shell 120, the energy storage device 100 is arranged within the holder 500 and the laser beam 210 emitted by the laser optics 200 is directed onto the surface 130.

[0018] To create a first structure 300 surrounding the housing shell 120, the energy storage device 100 is guided in rotation by means of the holder 500 during surface processing in such a way that a distance between the surface 130 of the housing shell 120 and the laser optics 200 emitting the laser beam 210 onto the surface 130, in particular a focal position of the laser optics 200, is kept constant. The energy storage device 100 is rotated by means of the holder 500 in such a way that the first structure 300 can be created circumferentially on the surface 130. Due to the constant distance between the surface 130 and the focal position of the laser optics 200, a constant depth of the first structure 300 can be achieved circumferentially.

[0019] The first structure 300 is created in a first processing area 301 with a first width 302. The first width 302 is, for example, 6 mm. The first structure 300 is arranged at an end of the housing shell 120 facing the upper housing cover 111, with its first width 302 extending from this end toward the lower housing cover 112.

[0020] In the lower region of the energy storage device 100, a second structure 310 with a second width 312 is created in the surface 130 in a similar manner in a second processing area 311. The second width 312 is, for example, 6 mm. The second structure 310 is arranged at an end of the housing shell 120 facing the lower housing cover 112, with its second width 312 extending from this end toward the upper housing cover 111.

[0021] Between the first structure 300 and the second structure 310 there is an unprocessed area which in particular has no structuring.

[0022] For example, the first structure 300 and the second structure 310 form unevenness on the surface 130, thereby increasing the application area for an adhesive or potting compound. The increase in the application area results in a larger contact area for the adhesive or potting compound, thereby achieving improved adhesion to the surface 130. List of reference symbols 100 electrical energy storage units 110 housings 111 upper housing cover 112 lower housing cover 120 Housing shell 130 surface 200 laser optics 210 laser beam 300 first structure 301 first processing area 302 first width 310 second structure 311 second processing area 312 second width 400 device 500 bracket QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 11 777 165 B2

[0002]

Claims

[1] Method for surface treatment of a cylindrical housing (110) of an electrical energy storage device (100) made of metal by means of laser structuring, wherein the housing (110) has a housing shell (120) and an upper housing cover (111) surrounded by the housing shell (120) and a lower housing cover (112) surrounded by the housing shell (120), and the housing shell (120) is surface-treated, characterized by that during surface treatment the housing (120) is guided in a holder (500) in a rotating manner such that a distance of a surface (130) of the housing shell (120) to a laser optics (200) emitting at least one laser beam (210) onto the surface (130), in particular a focus position of the laser optics (200), is kept constant and by means of the at least one laser beam (210) at least one structure (300, 310) is produced in the surface (130), encircling the housing shell (120). [2] Method according to claim 1, characterized by that a first structure (300) is produced in a first processing area (301) extending around the housing shell (120) and a second structure (310) is produced in a second processing area (311) extending around the housing shell (120) by means of laser structuring. [3] Method according to claim 2, characterized by , that - the first processing area (301) is selected such that the first structure (300) is arranged at an end of the housing shell (120) facing the upper housing cover (111) and extends from this end with a predetermined first width (302) in the direction of the lower housing cover (112), - the second processing area (311) is selected such that the second structure (310) is arranged at an end of the housing shell (120) facing the lower housing cover (112) and extends from this end with a predetermined second width (312) in the direction of the upper housing cover (111) and - the two structures (300, 310) are spaced apart from each other. [4] Method according to claim 3, characterized by that the first structure (300) is produced with a first width (302) of at least 6 mm and the second structure (310) is produced with a second width (312) of at least 6 mm.

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