Process for producing a material composite for a resistor arrangement
Patent Information
- Application Number
- EP2024709720
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-03-17
- Filing Date
- 2024-03-06
- Publication Date
- 2026-01-21
AI Technical Summary
Existing methods for producing material composites for resistance arrangements are limited to a maximum thickness of 3 to 4 mm, making it difficult to handle thicker metal strips and resulting in limited availability, as they become rigid and uncoilable, which is inadequate for high-current applications like electric vehicles.
A method involving the flat connection of two starting materials, each comprising different metals, with aligned seam areas to form a material composite with increased thickness, allowing for the production of resistance arrangements with thicknesses greater than 4 mm by using readily available thin starting materials that can be easily handled and processed.
Enables the production of thick material composites suitable for high-current applications, reducing current density and thermal issues, while maintaining the electrical properties of the resistance element and connection elements, thus enhancing the reliability of current measurement in electric vehicles.
Smart Images
Figure EP2024055782_26092024_PF_FP
Abstract
Description
[0001] Description
[0002] Method for producing a material composite for a resistor arrangement
[0003] The invention relates to a method for producing a material composite for a resistor arrangement for measuring the strength of an electric current.
[0004] Current measurements in electronic circuits are carried out using measuring resistors connected in series with the component to be monitored. The current is determined according to Ohm's law from the voltage drop across the shunt resistor. The resistance value is assumed to be known. Correct and reliable current measurement is particularly important, for example, in the battery management system of an electric or hybrid vehicle. A resistor assembly comprising such a low-ohm measuring resistor of approximately 10 to 50 pOhm and terminals for connecting the resistor assembly to the circuit can be manufactured from a longitudinally welded composite material. This is known, for example, from document EP 0 605 800 A1.The composite material is manufactured from three metal strips, each of which is joined to one another via a longitudinal seam using an electron beam or laser welding process. The middle metal strip consists of a material with a very low temperature coefficient of resistance. This material forms the actual resistance element of the resistor arrangement. The two outer strips are usually made of a material with high electrical conductivity, such as copper. Such materials usually have a high temperature coefficient of resistance compared to the material of the resistance element. These two outer strips form connection elements, via which the measuring resistor can be connected to an electrical circuit.
[0005] As the power of electric or hybrid vehicles increases, so does the current flow through the measuring resistor. Currents of up to 3000 A are specified, particularly with regard to the MCS (Megawatt Charging System) charging standard for trucks. A high current leads to significant heating, particularly of the resistance element. Excessive heating of the resistance element can lead to an uncontrollable change in the resistance value and must therefore be avoided. This heating can be reduced by increasing the thickness of the resistance element and thus its cross-section. This reduces the current density and increases the thermal mass of the resistance element. Alternatively, to limit the current flow per resistance element, it would also be possible to connect two or more resistor arrangements in parallel.However, this alternative is not cost-effective compared to using a single resistor array made of a thick composite material. Therefore, there is a need for a composite material for resistor arrays with a greater thickness than those used today.
[0006] The process described in EP 0 605 800 A1 is suitable for producing a composite material with a maximum thickness of 3 to 4 mm. Handling thicker metal strips poses problems, particularly due to their rigidity. Above a certain thickness, metal strips can no longer be wound into coils, making their processing on an industrial scale impossible or only possible to a limited extent. The market availability of metal strips with a thickness greater than 4 mm is therefore limited.
[0007] The invention is therefore based on the object of providing a method for producing a material composite for a resistor arrangement comprising an electrical measuring resistor for current measurement and connection elements, with a greater thickness than resistor arrangements currently in use. In particular, the invention is based on the object of providing a method for producing a material composite for such a resistor arrangement with a thickness of more than 4 mm.
[0008] The invention is defined by the features of claim 1. The further dependent claims relate to advantageous embodiments and developments of the invention.
[0009] The invention relates to a method for producing a material composite for a resistor arrangement used to measure the strength of an electric current, wherein the method comprises the following steps: a) providing a first, in particular plate-, strip-, or band-shaped, starting material and a second, in particular plate-, strip-, or band-shaped starting material, wherein the starting materials each comprise a first material made of a first metal and a second material made of a second metal, wherein the second metal is different from the first metal, and wherein both the first starting material and the second starting material each have a seam region at which the first material and the second material of the respective starting material are bonded to one another, in particular by a weld seam, b) bonding the first starting material to the second starting material over a surface area,wherein the first material of the first starting material is materially bonded to the first material of the second starting material and the second material of the first starting material is materially bonded to the second material of the second starting material, and wherein the bonding is carried out such that the seam region of the first starting material and the seam region of the second starting material are aligned with one another.
[0010] The invention is based on the idea that a resistor arrangement is produced from a composite material whose combination of materials already corresponds to the combination of materials of the resistor arrangement. A resistor arrangement used as a shunt resistor for measuring current intensities comprises at least one resistance element, which represents the actual measuring resistance, and at least one connection element for connecting the resistor arrangement to an electrical circuit. The at least one resistance element, on the one hand, and the at least one connection element, on the other hand, consist of different metals. The specific electrical resistance of the metal of the resistance element can be at least a factor of 10 greater than the specific electrical resistance of the metal of the connection element.On the other hand, the magnitude of the temperature coefficient of resistance of the metal of the terminal element is much larger, typically at least a factor of 80, than the magnitude of the temperature coefficient of resistance of the metal of the resistive element. In particular, the magnitude of the temperature coefficient of resistance of the metal of the resistive element can be less than 5 10'. 5 1 / K, while the resistance temperature coefficient of the metal of the terminal element is approximately 4-10 -3 1 / K. The connection element of the resistor arrangement can be made of copper, a preferably low-alloy copper alloy, aluminum, or a preferably low-alloy aluminum alloy, or can comprise at least one of these materials. The resistance element can be made of a copper alloy, which is commonly used as a resistance alloy.
[0011] In the method according to the invention, a material composite is produced by bonding two starting materials together over a large area. The two starting materials themselves are each material composites. They each comprise at least a first material and a second material, which are bonded to one another in a seam region, in particular by a weld seam. The connection element of a resistor arrangement is to be formed from the first material of the provided starting materials in later work steps, while the resistance element is to be formed from the second material of the provided starting materials in later work steps. Thus, the above explanations regarding the electrical properties of the materials of a resistor arrangement can be transferred accordingly to the first and second materials of the two starting materials.Preferably, corresponding materials of the two starting materials are identical, i.e., the same within the tolerances of their chemical composition. However, it is also possible for corresponding materials of the two starting materials to have different chemical compositions.
[0012] In process step b), the first starting material and the second starting material are joined together in such a way that the seam regions of the two starting materials are aligned with one another. In other words, the seam regions are arranged in alignment, i.e. without any significant offset from one another. The first material of the first starting material is joined surface-to-surface with the first material of the second starting material, while the second material of the first starting material is joined surface-to-surface with the second material of the second starting material. The two starting materials, each provided as a material composite, are thus joined together in such a way that they subsequently form a material composite having at least two regions separated by the seam regions of the two starting materials arranged in alignment.These regions each consist of corresponding materials from the two starting materials. Preferably, each region consists of a uniform material. In this preferred case, the composite material produced by the process is identical to the two starting materials in terms of the combination of materials.
[0013] The particular advantage of the method according to the invention is that a material composite can be produced from relatively thin starting materials provided as a material composite. This material composite is suitable for producing a resistor arrangement which, due to its external dimensions, in particular its thickness, can no longer be directly manufactured from a single thin and thus readily available industrial-scale starting material. The proposed method allows the use of relatively thin and thus easily handled starting materials. Such starting materials can be produced using currently available equipment and are therefore readily available. A thick material composite produced using the proposed method can subsequently be separated into intermediate products, for example by cross-cutting.Such an intermediate product then serves as the starting material for the production of a resistor arrangement that can be used to measure the strength of an electric current. This avoids the need to process thick material composites over long lengths. Within the scope of one embodiment of the method, both the first starting material and the second starting material can each comprise a third material, wherein both the first starting material and the second starting material each have a further seam region at which the second material and the third material are bonded to one another, in particular by a weld seam.In step b), the third material of the first starting material is materially joined to the third material of the second starting material, the joining being carried out such that the further seam region of the first starting material and the further seam region of the second starting material are aligned with one another. In this way, a material composite is provided from which a resistor arrangement can be produced in which the resistor element is arranged between two connection elements. In particular, the third material of a starting material can be made of the same metal as the first material of this starting material. Furthermore, in particular the third material of the two starting materials can be made of the same metal as the first material of the two starting materials.
[0014] The process is not limited to composite materials comprising two or three materials, but can also be used to produce a composite material comprising four or more materials, as known, for example, from the document DE 10 2020 101 070 A1.
[0015] Within the scope of a preferred embodiment of the method, both the first material and the second material of the first starting material can be strip-shaped materials, wherein the at least one seam region of the first starting material is located at contacting strip edges of these strip-shaped materials of the first starting material, so that the first starting material is a strip-shaped, quasi-endless material composite. At the same time, both the first material and the second material of the second starting material can be strip-shaped materials, wherein the at least one seam region of the second starting material is located at contacting strip edges of these strip-shaped materials of the second starting material, so that the second starting material is also a strip-shaped, quasi-endless material composite. The provision of the starting materials takes place continuously.This can be achieved, for example, by unwinding the starting materials from a coil. The proposed process is particularly advantageous for production from strip, because strip material up to 4 mm thick can be easily wound into coils. For thicker materials, this is only possible with increased effort due to their rigidity. Using the proposed process, for example, a composite material with a thickness of approximately 8 mm can be produced from two starting materials, each 4 mm thick.
[0016] Within the scope of a specific embodiment of this preferred embodiment, the surface bonding of the first starting material to the second starting material can be achieved by continuous plating, preferably by roll bonding, in particular by laser roll bonding. Plating, in particular laser roll bonding, is particularly suitable for the surface and material-to-material bonding of strip-shaped materials.
[0017] Within the scope of an alternative embodiment of the method, the first starting material can be a material composite of finite extent, in particular finite length, and the second starting material can be a material composite of finite extent, in particular finite length. In particular, the first and the second starting material can each be a discrete plate- or strip-shaped material composite, i.e. a material composite with defined dimensions in all spatial directions. In a preferred embodiment of this alternative embodiment, the extension of the first and the second starting material in the direction transverse to the respective planar seam regions is greater than the extension of the first and the second starting material in the direction longitudinal to the respective planar seam regions. In other words, in this preferred embodiment of the invention, the width of the two starting materials is greater than their length.The use of material composites of finite extension, especially finite length, as starting materials enables the production of a material composite with a complex geometry that is specifically tailored to the requirements of the resistor arrangement. For example, the material composite can feature steps or a taper.
[0018] Within the scope of a specific embodiment of this alternative embodiment, the surface connection of the first starting material to the second starting material can be achieved by welding, in particular resistance welding or laser welding. When producing a material composite of finite expansion, welding is a suitable method for the surface connection of the starting materials.
[0019] Embodiments of the invention are explained in more detail with reference to the schematic drawings.
[0020] Showing:
[0021] Fig. 1 schematically shows the process sequence in cross section Fig. 2 a preferred embodiment of the process Fig. 3 an alternative embodiment of the process
[0022] Corresponding parts are provided with the same reference numerals in all figures.
[0023] Fig. 1 shows a schematic diagram of the process steps. In the left half of Fig. 1, the two starting materials 1, 2 are shown in cross-section, while on the right side of Fig. 1, the produced material composite 3 is shown in cross-section. The two starting materials 1, 2 each consist of a first material 11, 21, a second material 12, 22 and a third material 13, 23. In the case shown, the materials 11, 12, 13, 21, 22, 23 are each in the form of a plate, strip or band with a rectangular cross-section. The materials 11, 12, 13 of the first starting material 1 all have the same thickness D1 and the materials 21, 22, 23 of the second starting material 2 all have the same thickness D2.For both starting materials 1, 2, the second material 12, 22 is arranged between the first material 11, 21 and the third material 13, 23 and is materially bonded to the first material 11, 21 and the third material 13, 23 on its narrow sides. In the case shown, each of the two starting materials 1, 2 forms a plate-, strip-, or band-shaped material composite with a uniform thickness D1 or D2. The thicknesses D1, D2 of the two starting materials 1, 2 are usually between 2 mm and 4 mm. The two starting materials 1, 2 can - as shown in Fig. 1 - have the same thickness or have different thicknesses.
[0024] The first 11, 21 and third 13, 23 materials of the two starting materials 1, 2 preferably consist of copper, a copper alloy, aluminum or an aluminum alloy, while the respective second materials 12, 22 preferably consist of a copper-based resistance alloy, in particular a copper-manganese alloy or a copper-manganese-nickel alloy. In particular, CuMn10Ni4, CuMn12Ni2, CuMn14Ni2 and CuZn15Mn15AI can be mentioned as examples of resistance alloys. Opposing materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2 are identical. At the contact surfaces of two materials, a seam region 15, 16, 25, 26 is formed as a result of the material connection. The seam area 15, 16, 25, 26 can, for example, be a weld seam. The seam area 15, 16, 25, 26 extends over the entire thickness D1, D2 of the respective starting material 1, 2.The width, i.e. the lateral extent of the seam region 15, 16, 25, 26 is usually smaller than the thickness D1, D2 of the respective starting material 1, 2. The lateral distance between the two seam regions 15, 16 of the first starting material 1 is equal to the lateral distance between the two seam regions 25, 26 of the second starting material 2.
[0025] The two starting materials 1, 2 are joined together over a wide area to form a material composite 3. This is shown on the right-hand side of Fig. 1. The connecting plane 39 between the two starting materials is indicated as a dashed line in the cross-sectional view. The joining of the two starting materials 1, 2 is carried out in such a way that the first material 11 of the first starting material 1 is joined over a wide area to the first material 21 of the second starting material 2, the second material 12 of the first starting material 1 is joined over a wide area to the second material 22 of the second starting material 2, and the third material 13 of the first starting material 1 is joined over a wide area to the third material 23 of the second starting material 2.Because the distance between the two seam areas 15, 16 of the first starting material 1 is the same as the distance between the two seam areas 25, 26 of the second starting material 2, it is possible to join the two starting materials 1, 2 in such a way that corresponding seam areas 15 / 25, 16 / 26 of the two starting materials 1, 2 are arranged in alignment with one another: The seam areas 15, 25 between the first material 11, 21 and the second material 12, 22 of the two starting materials 1, 2 are arranged opposite one another in alignment, and the seam areas 16, 26 between the second material 12, 22 and the third material 13, 23 of the two starting materials 1, 2 are arranged opposite one another in alignment. Corresponding seam areas 15 / 25 and 16 / 26 are therefore arranged in alignment. The material composite 3 thus produced has a thickness D3 that is approximately equal to the sum of the thicknesses D1 and D2 of the two starting materials 1, 2. The thickness D3 can in particular be between 4 mm and 8 mm.Furthermore, the produced material composite 3 is characterized in that it has three regions 31, 32, 33, each of which consists of a uniform material: A first region 31 consists of the two first materials 11, 21 of the first and second starting materials 1, 2 and thus uniformly of a first metal, a second region 32 consists of the two second materials 12, 22 of the first and second starting materials 1, 2 and thus uniformly of a second metal, which can be a resistance alloy, and a third region 33 consists of the two third materials 13, 23 of the first and second starting materials 1, 2 and thus uniformly of a third metal, which can be identical to the first metal. Because opposing seam areas 15 / 25, 16 / 26 are aligned, the three areas 31, 32, 33 each have a cross-section with a smooth edge, here in the form of a rectangle.Therefore, the material composite 3 has the same characteristics as the two starting materials 1 , 2 with regard to the combination of its materials, but it has approximately twice the thickness of a single starting material 1 , 2.
[0026] To carry out the invention, it is not necessary for the two starting materials 1, 2 to have a uniform thickness. It is also possible for the materials 11, 13, 21, 23 arranged on the outside to be thinner than the material 12, 22 arranged in the middle. Alternatively, it is also possible for the materials 11, 13, 21, 23 arranged on the outside to be thicker than the material 12, 22 arranged in the middle. It is also possible for one of the two starting materials 1, 2 to have a uniform thickness, while the other starting material 1, 2 has a varying thickness. Fig. 2 shows a schematic view of a preferred embodiment of the method, namely the method using strip-shaped starting materials 1, 2. The arrows marked with an X show the processing direction. A first strip-shaped starting material 1 and a second strip-shaped starting material 2 are fed to a rolling device 5.Of the rolling device 5, only the two rolling tools 5a, 5b are shown. The two starting materials 1, 2 have a thickness of typically no more than 4 mm, so that they can each be unwound as a quasi-endless strip from a coil (not shown) and fed to the rolling device 5. As explained in connection with Fig. 1, the two starting materials 1, 2 each consist of a first strip-shaped material 11, 21, a second strip-shaped material 12, 22 and a third strip-shaped material 13, 23, wherein the second material 12, 22 is in each case materially bonded at its narrow sides to the first material 11, 21 or the third material 13, 23 of the respective starting material 1, 2. The two starting materials 1, 2 are thus each configured as a tri-strip. Such Th-bands can be produced, for example, using the process described in document EP 0 605 800 A1.In the illustrated case, the dimensions of the opposing materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2 are identical. In particular, the distance between the two seam areas 15, 16 of the first starting material 1 is equal to the distance between the two seam areas 25, 26 of the second starting material 2.
[0027] Immediately before entering the gap between the two rolling tools 5a, 5b, the two starting materials 1, 2 are heated by a laser beam 6. It is also possible to use multiple laser beams 6, the power and / or wavelength of which is each adapted to the properties of the different, adjacently arranged materials 11, 12, 13, 21, 22, 23 of the two starting materials 1, 2. Between the rolling tools 5a, 5b, opposing materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2 are bonded to one another by the rolling force applied by the rolling tools 5a, 5b. The materials heated by the laser beam 6 are bonded to one another in a material-to-material bond.Because the distance between the two seam regions 15, 16 of the first starting material 1 is equal to the distance between the two seam regions 25, 26 of the second starting material 2, it is possible to join the two starting materials 1, 2 such that corresponding seam regions 15 / 25, 16 / 26 of the two starting materials 1, 2 are arranged in alignment with one another. The material composite 3, which leaves the rolling device 5, has three adjacent regions 31, 32, 33, which are each formed from the corresponding materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2. As explained in connection with Fig. 1, the material composite 3 has a thickness D3 which is approximately equal to the sum of the thicknesses of the starting materials 1, 2. The thickness D3 can be at least 4 mm and up to 8 mm. Strip material of this thickness cannot be satisfactorily wound into a coil due to its stiffness.Therefore, it is expedient to separate the produced material composite 3 into intermediate products of a finite length by cross-cutting. Such an intermediate product can subsequently be used to manufacture a resistor assembly. The cross-cutting step is not shown in Fig. 2.
[0028] Fig. 3 schematically shows an alternative embodiment of the method, namely the method using starting materials 1, 2 with finite external dimensions. The two starting materials 1, 2 are each designed as discrete plate- or strip-shaped material composites with a finite length and a finite width. The width of a starting material 1, 2 is understood to be its extension measured perpendicular to the contact surfaces corresponding to the respective planar seam regions 15, 16, 25, 26. The length of a starting material 1, 2 is understood to be its extension longitudinal to the contact surfaces corresponding to the respective planar seam regions 15, 16, 25, 26, measured in the intended connection plane 39. As explained in connection with Fig.1, the two starting materials 1, 2 each consist of a first plate- or strip-shaped material 11, 21, a second plate- or strip-shaped material 12, 22 and a third plate- or strip-shaped material 13, 23, wherein the second material 12, 22 is materially bonded at its narrow sides to the first 11, 21 or the third 13, 23 material of the respective starting material 1, 2. In the case shown in Fig. 3, the two starting materials 1, 2 each have a uniform thickness D1, D2 of typically no more than 4 mm. They can be produced by cross-cutting a tri-strip. Such Th-strips can be produced, for example, using the process described in the document EP 0 605 800 A1. In Fig.For reasons of clarity, in Figure 3, the seam areas 15, 16, 25, 26 between the individual materials of the starting materials 1, 2 are each shown only by a line, i.e., as a surface, neglecting the thickness of the seam areas. The distance between the two seam areas 15, 16 of the first starting material 1 is equal to the distance between the two seam areas 25, 26 of the second starting material 2.
[0029] The two starting materials are brought together in such a way that corresponding materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2 come into contact. Because the distance between the two seam areas 15, 16 of the first starting material 1 is equal to the distance between the two seam areas 25, 26 of the second starting material 2, the two starting materials 1, 2 can be brought together in such a way that corresponding seam areas 15 / 25, 16 / 26 of the two starting materials 1, 2 are aligned with one another. The starting materials 1, 2 are then joined to one another over a wide area and in a material-to-material bond using a suitable joining process, for example, resistance welding. The resulting material composite 3 has three adjacently arranged areas 31, 32, 33, each of which is formed from the corresponding materials 11 / 21, 12 / 22, 13 / 23 of the two starting materials 1, 2.The three regions 31, 32, 33 each consist of a uniform material. As explained in connection with Fig. 1, the composite material 3 has a thickness D3 that is approximately equal to the sum of the thicknesses D1, D2 of the starting materials 1, 2. The thickness D3 can be at least 4 mm and up to 8 mm. The connection plane 39, which is defined in the composite material 3 by the contact surface of the two starting materials, is indicated by dashed lines in Fig. 3.
[0030] In particular, in the embodiment of the manufacturing method schematically shown in Fig. 3, it is not necessary for the two starting materials 1, 2 to have a uniform thickness D1, D2. It is also possible for the materials 11, 13, 21, 23 arranged on the outside to be thinner than the material 12, 22 arranged in the middle. Alternatively, it is also possible for the materials 11, 13, 21, 23 arranged on the outside to be thicker than the material 12, 22 arranged in the middle. It is also possible for one of the two starting materials 1, 2 to have a uniform thickness, while the other starting material has a varying thickness. This enables the production of resistor arrangements whose geometry is flexibly adapted to the respective requirements.
[0031] List of reference symbols
[0032] 1 , 2 Source material
[0033] 11 , 21 first material
[0034] 12, 22 second material
[0035] 13, 23 third material
[0036] 15. 25 Seam area
[0037] 16. 26 Seam area
[0038] 3 Material composite
[0039] 31 first area
[0040] 32 second area
[0041] 33 third area
[0042] 39 Connection level
[0043] 5 Rolling device
[0044] 5a, 5b rolling tool
[0045] 6 laser beam
[0046] D1, D2, D3 thickness
[0047] X Machining direction
Claims
Patent claims 1. A method for producing a material composite (3) for a resistance arrangement for measuring the strength of an electric current, the method comprising the following steps: a) providing a first starting material (1) and a second starting material (2), wherein the starting materials (1, 2) each comprise a first material (11, 21) made of a first metal and a second material (12, 22) made of a second metal, wherein the second metal differs from the first metal, and wherein both the first starting material (1) and the second starting material (2) each have a seam region (15, 25) at which the first material (11, 21) and the second material (12, 22) of the respective starting material (1, 2) are bonded to one another in a material-to-material manner, b) bonding the first starting material (1) to the second starting material (2) over a surface area,wherein the first material (11) of the first starting material (1) is materially bonded to the first material (21) of the second starting material (2) and the second material (12) of the first starting material (1) is materially bonded to the second material (22) of the second starting material (2), and wherein the bonding is carried out such that the seam region (15) of the first starting material (1) and the seam region (25) of the second starting material (2) are arranged in alignment with one another.
2. Method according to claim 1, characterized in that both the first starting material (1) and the second starting material (2) each comprise a third material (13, 23), wherein both the first starting material (1) and the second starting material (2) each have a further seam region (16, 26) at which the second material (12, 22) and the third material (13, 23) are materially joined to one another, and in that in step b) the third material (13) of the first starting material (1) is materially joined to the third material (23) of the second starting material (2), wherein the joining is carried out in such a way that the further seam region (16) of the first starting material (1) and the further seam region (26) of the second starting material (2) are arranged in alignment with one another.
3. Method according to claim 1 or 2, characterized in that both the first material (11) and the second material (12) of the first starting material (1) are band-shaped materials and the at least one seam region (15, 16) of the first starting material (1 ) is located at contacting strip edges of these strip-shaped materials (11 , 12) of the first starting material (1 ), so that the first starting material (1 ) is a strip-shaped material composite, that both the first material (21 ) and the second material (22) of the second starting material (2) are strip-shaped materials and the at least one seam region (25, 26) of the second starting material (2) is located at contacting strip edges of these strip-shaped materials (21, 22) of the second starting material (2), so that the second starting material (2) is a strip-shaped material composite, and that the provision of the starting materials (1, 2) takes place continuously.
4. Method according to claim 3, characterized in that the planar joining of the first starting material (1) with the second starting material (2) is carried out by continuous plating.
5. Method according to claim 1 or 2, characterized in that the first starting material (1) is a material composite of finite extension and that the second starting material (2) is a material composite of finite extension.
6. Method according to claim 5, characterized in that the planar The first starting material (1) is connected to the second starting material (2) by welding.