DE102013219404A1 - Method for producing strips and strips of two metallic materials - Google Patents

Abstract

The invention relates to a method for producing a strip (10) from two different metals and / or metallic alloys from strips (1, 2, 3), in which the metals and / or the metallic alloys of the strip (10) are firmly joined together by roll-plating be connected, in which two first metallic bands (1, 2) and a second band (3) made of another metal or another metallic alloy, at each two abutment edges (5) starting from one edge (5) in one of them In the profiling over the entire length of the first strips (1, 2) to be joined, a recess (8) is formed by removing material from two of the strips (1, 2, 3) and these Edge (5) is removed over the entire length to be joined, and the bands (1, 2, 3) are positioned to each other, wherein the two first bands (1, 2) are arranged spaced from each other and wherein the second band (3 ) is arranged adjacent or resting on a respective recess (8) on the first bands (1, 2) and the second band (3) bridges the distance between the two first bands (1, 2), and the bands (1, 2, 3) are joined to each other by roll-plating the juxtaposed tapes (1, 2, 3), whereby by rolling plating a contiguous third strip (10) having two parallel faces is produced. Among other things, the invention relates to the production of strips (11) and stamped gratings and the use of metallic strips (11) and a battery having a plurality of battery elements or a plurality of galvanic cells.

Description

The invention relates to a method for producing a strip of two different metals and / or metallic alloys from strips, in which the metals and / or the metallic alloys of the strip are firmly joined together by roll-plating, as well as a method for producing a plurality of strips or punched gratings two different metals and / or metallic alloys of ribbons, in which the metals and / or metallic alloys are firmly bonded together by roll-bonding.

The invention also relates to the use of metallic strips produced in this way for the electrical contacting of at least two battery elements or at least two galvanic elements. Furthermore, the invention relates to metallic strips, stamped grids and strips made of two different metals and / or metal alloys and a battery comprising a plurality of battery elements or a plurality of galvanic cells, wherein the battery elements or galvanic cells are electrically connected to such metallic strips.

Metallic strips of two different metallic materials are used in particular as connectors for battery elements or galvanic elements of batteries or accumulators. Currently, lithium-ion batteries (or lithium-ion batteries) and nickel-metal hydride batteries (or nickel-metal hydride batteries) are produced in large quantities. In this case, such metallic strips are used to interconnect and connect the individual cells of the batteries or batteries.

The combination of two different metals can be difficult if they can not be joined simply by joining. Walzplattierverfahren are gladly used for this purpose, wherein the metals are initially present in mass production as tapes, which are joined together with a roll by roll-plating. Such a method is for example from the US 4,798,932 A1 known.

For the production of strips or strips produced therefrom for connecting batteries or their cells, these can be produced, for example, by a cold-rolled plating method, as described, for example, in US Pat DE 2008 018 204 A1 is described. Especially the use of these metallic strips as connectors for battery elements requires a double-sided purity of the different metals and / or metal alloys.

The US 2011/0 206 943 A1 proposes to solve these problems, to achieve a connection of the two materials by a larger overlap area. For this purpose, the two adjoining points are suitably shaped so that they can be placed inside each other and grip each other. This has the disadvantage that the two parts to be joined together with great care must be elaborately formed and that the two parts must be placed exactly together before they are joined together with the subsequent rolling process. When rolling a joint, the pressure must be applied with care to the connecting parts so that the connection remains homogeneous through a uniform material flow.

The object of the invention is therefore to overcome the disadvantages of the prior art. In particular, a method is to be found which is as simple as possible to carry out, which can be realized as inexpensively as possible and which is suitable for mass production. At the same time, however, the method is also intended to produce connections of the two metallic materials of the metal strips which are as stable as possible.

• A) Bereitstellen von zwei ersten metallischen Bändern und eines zweiten Bands aus einem anderen Metall oder einer anderen metallischen Legierung, wobei alle Bänder vier Kanten, zwei zueinander parallele Flächen und einen zumindest Näherungsweise rechteckigen Querschnitt aufweisen,
• B) Profilieren der ersten Bänder ausgehend von jeweils einer Kante in eine der zueinander parallelen Flächen hinein, wobei bei dem Profilieren über die gesamte zu verbindende Länge der ersten Bänder eine Ausnehmung durch Entfernen von Material aus den ersten Bändern entsteht und diese Kante auf der gesamten zu verbindenden Länge entfernt wird,
• C) Positionieren der Bänder zueinander, wobei die beiden ersten Bänder zueinander beabstandet angeordnet werden, die nicht profilierten Flächen der ersten Bänder in einer Ebene nebeneinander angeordnet werden und die Ausnehmungen der ersten Bänder zueinander spiegelbildlich und benachbart angeordnet werden, und wobei das zweite Band in den Ausnehmungen der ersten Bänder anliegend oder aufliegend angeordnet wird und das zweite Band den Abstand der beiden ersten Bänder überbrückend angeordnet wird, und
• D) Verbinden der Bänder miteinander durch Walzplattieren der aneinander gelegten Bänder, wobei durch das Walzplattieren ein zusammenhängendes drittes Band mit zwei parallelen Flächen erzeugt wird.

The objects of the invention are achieved by a method for producing a strip of two different metals and / or metallic alloys from strips, in which the metals and / or the metallic alloys of the strip are firmly joined together by roll-bonding, characterized by the following, chronologically consecutive steps:

• A) providing two first metallic bands and a second band made of a different metal or another metallic alloy, wherein all bands have four edges, two mutually parallel surfaces and an at least approximately rectangular cross section,
• B) profiling of the first bands starting from one edge in one of the mutually parallel surfaces, wherein in the profiling over the entire length of the first bands to be connected a recess by removal of material from the first bands is formed and this edge on the whole to connecting length is removed,
• C) positioning the bands to each other, wherein the two first bands are arranged spaced apart, the non-profiled surfaces of the first bands are arranged in a plane next to each other and the recesses of the first bands are mirror images of each other and adjacent, and wherein the second band in the Recesses of the first bands is arranged adjacent or resting and the second band is arranged bridging the distance between the two first bands, and
• D) bonding the tapes together by roll-plating the juxtaposed tapes, wherein the roll-plating produces a continuous third tap having two parallel faces.

• A) Bereitstellen von zwei ersten metallischen Bändern und eines zweiten Bands aus einem anderen Metall oder einer anderen metallischen Legierung, wobei alle Bänder vier Kanten, zwei zueinander parallele Flächen und einen zumindest Näherungsweise rechteckigen Querschnitt aufweisen,
• B) Profilieren des zweiten Bands ausgehend von jeweils einer Kante in eine der zueinander parallelen Flächen hinein, wobei diese Fläche diese beiden Kanten verbindet, wobei bei dem Profilieren über die gesamte zu verbindende Länge des zweiten Bands zwei Ausnehmungen durch Entfernen von Material aus dem zweiten Band entstehen und die beiden Kanten auf der gesamten zu verbindenden Länge durch jeweils eine der beiden Ausnehmungen entfernt werden,
• C) Positionieren der Bänder zueinander, wobei die beiden ersten Bänder zueinander beabstandet angeordnet werden und die parallelen Flächen der ersten Bänder in je einer Ebene nebeneinander angeordnet werden, und wobei das zweite Band derart an die ersten Bänder anliegend oder aufliegend angeordnet wird, dass die beiden ersten Bänder in je einer Ausnehmung des zweiten Bands angeordnet werden und dass das zweite Band den Abstand der beiden ersten Bänder überbrückend angeordnet wird, und
• D) Verbinden der Bänder miteinander durch Walzplattieren der aneinander gelegten Bänder, wobei durch das Walzplattieren ein zusammenhängendes drittes Band mit zwei parallelen Flächen erzeugt wird.

According to an alternative solution, the objects according to the invention are also achieved by a method for producing a strip of two different metals and / or metallic alloys from strips, in which the metals and / or the metallic alloys of the strip are firmly joined together by roll-bonding, characterized by the following, chronologically consecutive steps:

• A) providing two first metallic bands and a second band made of a different metal or another metallic alloy, wherein all bands have four edges, two mutually parallel surfaces and an at least approximately rectangular cross section,
• B) profiling of the second band starting from one edge into each of the mutually parallel surfaces, said surface connecting these two edges, wherein in the profiling over the entire length of the second band to be joined two recesses by removing material from the second band arise and the two edges are removed on the entire length to be connected by one of the two recesses,
• C) Positioning the bands to each other, wherein the two first bands are arranged spaced from each other and the parallel surfaces of the first bands are arranged in a plane next to each other, and wherein the second band is arranged adjacent to the first bands or resting, that the two first bands are arranged in a respective recess of the second band and that the second band is bridged over the distance of the two first bands, and
• D) bonding the tapes together by roll-plating the juxtaposed tapes, wherein the roll-plating produces a continuous third tap having two parallel faces.

• A) Bereitstellen von zwei ersten metallischen Bändern und eines zweiten Bands aus einem anderen Metall oder einer anderen metallischen Legierung, wobei alle Bänder vier Kanten, zwei zueinander parallele Flächen und einen zumindest Näherungsweise rechteckigen Querschnitt aufweisen,
• B) Profilieren eines der ersten Bänder und des zweiten Bands ausgehend von jeweils einer Kante in eine der zueinander parallelen Flächen hinein, wobei bei dem Profilieren über die gesamte zu verbindende Länge des einen ersten Bands und des zweiten Bands eine Ausnehmung durch Entfernen von Material aus den beiden Bändern entsteht und diese Kante auf der gesamten zu verbindenden Länge entfernt wird,
• C) Positionieren der Bänder zueinander, wobei die beiden ersten Bänder zueinander beabstandet angeordnet werden, die parallelen Flächen der ersten Bänder in je einer Ebene nebeneinander angeordnet werden, und wobei das zweite Band in der Ausnehmung des profilierten ersten Bands anliegend oder aufliegend angeordnet wird, das nicht profilierte erste Band in der Ausnehmung des zweiten Bands angeordnet wird und das zweite Band den Abstand der beiden ersten Bänder überbrückend angeordnet wird, und
• D) Verbinden der Bänder miteinander durch Walzplattieren der aneinander gelegten Bänder, wobei durch das Walzplattieren ein zusammenhängendes drittes Band mit zwei parallelen Flächen erzeugt wird.

However, the objects of the invention are also achieved by a method for producing a strip of two different metals and / or metallic alloys from strips, in which the metals and / or the metallic alloys of the strip are firmly joined together by roll-bonding, characterized by the following , chronologically consecutive steps:

• A) providing two first metallic bands and a second band made of a different metal or another metallic alloy, wherein all bands have four edges, two mutually parallel surfaces and an at least approximately rectangular cross section,
• B) profiling one of the first bands and the second band starting from one edge into one of the mutually parallel surfaces, wherein in the profiling over the entire length to be joined of a first band and the second band a recess by removing material from the both bands are created and this edge is removed over the entire length to be connected,
• C) positioning the bands relative to one another, wherein the two first bands are arranged spaced apart from one another, the parallel surfaces of the first bands being juxtaposed in a plane, and the second band being disposed in the recess of the profiled first band unprofiled first band is arranged in the recess of the second band and the second band is arranged bridging the distance between the two first bands, and
• D) bonding the tapes together by roll-plating the juxtaposed tapes, wherein the roll-plating produces a continuous third tap having two parallel faces.

The entire length of the bands to be connected preferably extends over the entire length of the bands. The entire length to be connected thereby relates at least to the area of a band which is then to be used to build up the strips, that is to say the area over which the bands are to be connected to one another. It can thus be provided that at the beginning and at the end of the bands or of the band with respect to the total length of the bands or the band short sections are not profiled.

The rectangular cross-section of the bands must be only roughly adhered to, so that it is sufficient if the bands have an approximate rectangular cross-section. Preferably, the bands have a good approximation rectangular cross-section, it being sufficient if the right angles are maintained with an accuracy of 5 °. The four corners of the cross section are formed by the edges. The cutting process (overcut or undercut) or the folding of the tapes causes inaccuracies in the shape of the edges, so that the corners of the rectangular cross section will always differ from an ideal corner shape. For example, the edges can be warped (eg pulled down) during separation. The edges can also be slightly rounded. The edges bound the parallel surfaces of the two bands in their entire length.

Also preferably, the two surfaces of the bands are plane-parallel to each other. Furthermore, it is preferred if the ratio of the width of the bands (parallel to the broad sides) to the height of the bands (parallel to the narrow sides, which may also be referred to as the thickness of the bands), in particular also of the produced band, is at least 10: 1, preferably between 20: 1 and 100: 1.

The third band is thus made from the first two bands and the second.

It may be provided that not only the edges from which the recesses extend are removed by the recesses, but also the nearest edge of the same band. This closest edge limits the opposite face of the tape on the same side. This practically creates a new edge on the underside. This is advantageous if the newly created edge is to be executed particularly tapered.

It may also be provided in the method according to the invention that the production of the two recesses during profiling is carried out with a machining technique. The profiling preferably takes place by milling.

These techniques are particularly applicable to continuous tape processing.

With a preferred further development of the method according to the invention, it is proposed that each band consist of only one metal or one metallic alloy, wherein preferably the two first bands consist of the same metal or the same metallic alloy.

As a result, the method can be simplified because the bands can also be arranged offset in the longitudinal direction against each other, without thereby the wrong areas would be interconnected.

Particularly preferably, it is proposed that the material of which the bands consist is selected from copper, aluminum, aluminum-based alloys and / or copper-base alloys.

Preferably, the first bands of copper and the second band of aluminum or the first bands of aluminum and the second band of copper.

These materials are particularly well suited for battery connectors and the strips produced therefrom therefore economically particularly well usable.

According to a further development of the methods according to the invention, it can be provided that, when the strips are connected to one another by roll-plating, the strips are deformed, the height of the generated third strip being less than the height of the first strips and the second strip.

The height of a band (which may also be referred to as the thickness of the band) corresponds to the distance between the two parallel faces of the unprofiled band. By forming a stable connection of the different materials of the bands is achieved.

In this further development, it may further be provided that heat is supplied to the bands during the forming and the height of the generated third band is at least 20% less than the height of the three output bands.

This small deformation may already be sufficient in the supply of heat energy in order to achieve a stable connection of the materials. The heat can be supplied for example by means of a current, inductive or heated roll cladding.

Alternatively, it can be provided that during the forming of the bands no heat is supplied and the height of the generated third band is at least 40% less than the height of the three output bands.

This degree of deformation is necessary when no heat is applied to achieve the desired stable bond between the materials.

The method according to the invention can be implemented particularly well if it is provided that the heights of the first two bands and of the second band are between 0.5 mm and 5 mm and after the roll cladding the generated third band has a height of 0.1 mm to 2 mm wherein the height of the generated third band is less than the height of the first bands and the second band.

These dimensions are well processable and sufficient for the use of connectors for batteries or accumulators or for punched grid.

It can also be provided that the first two bands have a width between 10 mm and 100 mm and the second band is at least as wide as the first bands and up to three times as wide as the first bands.

The width of the bands corresponds to the width of the parallel surfaces of the bands. Preferably, the two first bands are the same width or the width deviates only by a maximum of 10% from each other.

Through these widths of the bands connecting the bands can be done by roll cladding without much technical effort. Preferably, the second band is between 90% and 140% wider than the equal width first bands. This has the advantage that in a separation of the generated third band by a longitudinal section in the second band two bands are formed, which have approximately the same length of the two materials to the compound and the connection of the two materials runs centrally.

In order to provide a method which is particularly suitable for mass production, it can preferably be provided in all methods according to the invention that, when profiling the two bands or the second band, an unprofiled band is first unwound from a roll, the recess being produced by a subtractive method, preferably with a chipping technique or a milling technique is generated, and the profiled strip is then wound up again into a roll.

The use of wound rolls makes it possible to process large quantities of strips with compact equipment.

In order to produce a particularly stable connection, it can be provided according to the invention that a roll-plating method is used when joining the strips together. Roll-plating processes are particularly advantageous for implementing the process according to the invention.

For the mass production of the strips can also be preferably provided that when positioning the bands to each other, the bands are unwound from one roll, then the bands are positioned by deflection rollers in front of a nip in the desired manner to each other, then the thus positioned to each other bands rolled together and with each other and then the third band thus produced is wound into a roll.

By deflecting by means of guide rollers, it is possible to store the coils also spaced from each other and unwind.

In order to achieve a slight joining of the bands, it is proposed that each profiled band having at least one recess has the same cross-section at least along the length to be joined.

This means that all profiled tapes are just general cylinders at least along the length to be connected. Of course, the same applies to the non-profiled tapes. That is, the profiled ribbons in this region have a geometric shape that results from translating the cross-sectional area in a direction perpendicular to the cross-sectional area.

This simplifies the further processing of the tapes. When roll cladding or joining the metallic materials can be used with a uniform pressure and optionally with a constant supply of heat.

According to a particularly preferred development of the method according to the invention, it can be provided that each of the two recesses is produced with a first, a second and a third plane boundary surface, wherein the first boundary surface and the third boundary surface to the surface of the belt, in which the recess is generated or the recesses are generated are inclined, the second boundary surface is generated parallel to the plane of this surface of the belt, so that the parallel second boundary surface between the two inclined boundary surfaces is arranged and the first boundary surface adjacent to the surface of the tape, in which the recess is produced or the recesses are generated.

Such a recess results in an inserted band having a rectangular cross section to a particularly stable connection after the roll cladding, since the edge of the inserted tape can cut well into the inclined first boundary surface.

It can be provided that the recess is produced such that the angle of the first boundary surface to the Lot of the surface of the belt in which the recess is generated or the recesses are generated, between 7 ° and 25 °, preferably between 15 ° and 20 °, and the angle of the third boundary surface to the Lot of the surface of the belt in which the recess is generated or the recesses are generated, is between 20 ° and 60 °, preferably between 30 ° and 45 °.

At these angles, a particularly stable incision (sometimes referred to as "beaking") of the applied edges occurs.

Furthermore, it can be provided in these embodiments that the recess is produced such that the width of the second boundary surface is between 2 mm and 10 mm.

The width ensures a good circulation of the band to be connected via the recess.

In a further development of the invention, it is proposed that the recess be produced in such a way that the distance of the second boundary surface from the non-deformed surface of the band is between 60% and 20% of the height of the band without the recess, preferably between 25% and 40%. ,

Due to this depth of the recess, the recess is able to absorb a suitable volume of the applied band during roll cladding, that is to say during the forming, wherein not too much material has to be displaced from the connection points.

According to a further embodiment of the invention can also be provided that the distance between the two first bands is adjusted such that the edges of the voltage applied to the recesses bands rest on inclined boundary surfaces of the recesses. In the case of recesses with an inclined boundary surface, it may be provided that the edges of the bands resting in the recesses rest on the first boundary surfaces of the recesses.

As a result, a particularly stable connection of the different materials can be produced by cutting or biting the applied edges in the recesses during roll cladding.

• E) das derart erzeugte dritte Band wird in Streifen getrennt.

The objects relating to the production of strips of at least two different metals and / or metallic alloys is achieved by a method for producing a plurality of strips of two different metals and / or metallic alloys from strips, in which the metals and / or metallic alloys are bonded together by roll-bonding the strips are produced from a strip which has been produced by a described method according to the invention, the following step being carried out after the production of the third strip:

• E) the third band thus produced is separated into strips.

In this method according to the invention, provision can be made for the method to produce a plurality of battery connectors or accumulator connectors.

The metallic strips of two metallic materials are then the battery connectors or accumulator connectors.

With the method according to the invention, battery connectors or accumulator connectors can be mass-produced quickly and inexpensively. This is particularly interesting with increasing economic use of batteries and accumulators.

Furthermore, according to the invention it can be provided that the separation of the generated third band is carried out by cutting or punching in the longitudinal direction of the third band in the metal or the metallic alloy of the second band and the strips are then cut parallel or parallel to the longitudinal direction of the third band third bands are generated.

Strictly speaking, the strips are then produced by parallel cuts or parallel punchings perpendicularly or diagonally to the longitudinal direction of both separate parts or halves of the third strip.

This specifies a method which can be implemented easily and inexpensively, with which the strips can be produced.

In a preferred further development of the method relating to the strips, it is proposed that in step E) the generated third strip be separated into strips each containing exactly one compound of two different materials of a first band and the second band, the portion of the third band , which has been generated from the second band, is separated and perpendicular or diagonal to make several separations to produce the strips.

This allows many strips to be produced in a simple manner.

• E) das derart erzeugte dritte Band wird durch Ausstanzen von Bereichen des dritten Bands in das Stanzgitter umgeformt.

The objects of the invention are further achieved by a method for producing a stamped grid of two or three different metals and / or metallic alloys from strips, in which the metals and / or metallic alloys are firmly joined together by roll-bonding, wherein the stamped grid of a Produced by a method according to the invention described, wherein after the production of the third band of the following process step is carried out:

• E) the third band thus produced is transformed into the stamped grid by punching out areas of the third band.

The objects underlying the invention are also achieved by the use of metallic strips produced in this way for the electrical contacting of at least two battery elements or at least two galvanic elements.

The strips produced according to the invention can be used well for the purposes mentioned and at the same time are inexpensive to manufacture.

Furthermore, the objects of the invention are also achieved by a metallic strip consisting of two different metals and / or metal alloys prepared by such a method.

Furthermore, the objects of the invention are also achieved by a stamped grid consisting of two or three different metals and / or metal alloys, prepared by a described inventive method for its production.

The objects of the invention are also achieved by a metallic band consisting of at least two different metals and / or metal alloys, produced by one of the above-described methods for producing a band.

Finally, advantageous batteries or accumulators result from the use of the metallic strips according to the invention, so that the invention also comprises a battery having a plurality of battery elements or a plurality of galvanic cells, wherein the battery elements or galvanic cells are electrically connected or interconnected with such metallic strips.

The invention is based on the surprising finding that it is sufficient if two or even only one of the bands to be connected is reshaped or structured before the bands are connected to one another, and yet a stable connection over an extensive connection area is possible. An exact fit of the joints is due to deformation during roll cladding not necessary anymore. In addition, with a suitable shape of the recesses and with suitable positioning of the edges of the bands in the recesses, a particularly stable connection can be achieved in which the non-planar abutting each other but edges on boundary surfaces adjacent bands are pressed into each other during roll cladding and so by cutting or beaks very stable connect with each other.

By connecting a central second belt with two bands in the region of recesses which partially overlap the middle band, it is achieved that a homogeneous material flow during roll cladding takes place at both connection points, thereby producing a uniformly stable connection. The pressure of the rolls will be uniform on both sides and therefore will produce a more uniform pressure for roll cladding than if only one joint surface were made. The symmetry of the positioning of the bands thus causes a simplification of the manufacturing process, since the mechanical pressure in the roll cladding and the predetermined dimensions of the rollers must be set less accurately than if only two bands were connected together.

In the following, embodiments of the invention will be explained with reference to four schematically illustrated figures, without, however, limiting the invention. Showing:

1 : schematic views of starting, intermediate and end products of a method according to the invention according to claim 1 and 21 for explaining the same;

2 : schematic views of starting, intermediate and end products of a method according to the invention according to claim 2 and 21 for explaining the same;

3 : schematic views of starting, intermediate and end products of a method according to the invention according to claim 3 and 21 for explaining the same; and

4 : An enlarged schematic cross-sectional view through a band with a recess to illustrate a variant of the method according to the invention.

In the figures, the same reference numerals are sometimes used for the same or similar parts.

1 shows schematic views of chronologically successive starting, intermediate and end products of a method according to the invention according to claim 1 for explaining the same. The 1A) to 1D) show schematic cross-sectional views and the 1E) and 1F) show schematic perspective views of these products. The sequence of 1A) to 1D) corresponds to the chronological sequence of the inventive method steps according to claim 1. The sequence of 1A) to 1E) corresponds to the chronological sequence of the method steps according to the invention according to claim 21, which refers back to claim 1 or a dependent claim, while 1F) the final product produced, that is, the strip according to the invention 11 shows.

Analogously shows 2 schematic views of chronologically consecutive starting, intermediate and end products of an alternative method according to claim 2 for explaining the same. The 2A) to 2D) show schematic cross-sectional views and the 2E) and 2F) show schematic perspective views of these products. The sequence of 2A) to 2D) corresponds to the chronological sequence of the inventive method steps according to claim 2. The sequence of 2A) to 2E) corresponds to the chronological sequence of the method steps according to the invention according to claim 21, which refers back to claim 2 or a dependent claim, while 2F) the final product produced, that is, the strip according to the invention 11 shows.

Accordingly also shows 3 schematic views of chronologically consecutive starting, intermediate and end products of a third inventive method according to claim 3 for explaining the same. The 3A) to 3D) show schematic cross-sectional views and the 3E) and 3F) show schematic perspective views of these products. The sequence of 3A) to 3D) corresponds to the chronological sequence of the inventive method steps according to claim 3. The sequence of 3A) to 3E) corresponds to the chronological sequence of the method steps according to the invention according to claim 21, which refers to claim 3 or a dependent claim, while 3F) the final product produced, that is, the strip according to the invention 11 shows.

Two first metallic bands 1 . 2 are in the 1A) . 2A) and 3A) shown to the right and left of a middle, second metallic band 2 shown with greater width. The bands 1 . 2 . 3 are not necessarily physically juxtaposed in this process step. The 1A) . 2A) and 3A) So first, just show that these three metallic bands 1 . 2 . 3 to be provided. The same is true for the 1B) . 2 B) and 3B) ,

The bands 1 . 2 . 3 may for example consist of aluminum, copper, a copper-based alloy or an aluminum-based alloy. The band shown in the middle 3 but in any case it is made of a different metal or metallic alloy than the two outer bands 1 . 2 , Every band 1 . 2 . 3 has a rectangular cross-section, four edges 4 . 5 (the corners of the rectangular cross section) and two planes parallel to each other 6 . 7 (the sides of the rectangular cross section). The surfaces 6 . 7 are hereafter referred to as the first area 6 and the second surface 7 designated. In addition, the uniform name in the 1 . 2 and 3 because of always assumed that the edges 5 the first area 6 on one side or on both sides.

In a next process step, two recesses 8th in the tapes 1 . 2 . 3 generated by means of a milling process. Here are the two edges 5 completely removed. The milled bands 1 . 2 . 3 are in the 1B) . 2 B) and 3B) shown. In the method that is in 1 is shown, the two recesses 8th in the outer bands 1 . 2 (one each) generated and the middle band 3 is not excluded / structured. In the method that is in 2 is shown, the two recesses 8th in the middle band 3 on the same side or the same (first) surface 6 generated and the later outer bands 1 . 2 are not excluded / structured. In the method that is in 3 is shown, a recess 8th in the middle band 3 and another recess 8th in one of the later outer bands 1 produced and the other later outboard band 2 is not excluded / structured.

The milled bands 1 . 2 . 3 extend with the cross section shown along its entire length or at least along the length on which the bands 1 . 2 . 3 to be joined or fastened together. The recesses 8th A few millimeters extend into one of the surfaces (into the first surface 6 ) and reach to the edge 4 that the distant edge 5 on the second surface 7 opposite. It is also possible that this edge 4 is also removed with and so a new edge 4 forms.

Every recess 8th has three boundary surfaces that the recesses 8th or the bands 1 . 2 . 3 in the recesses 8th limit. A first boundary surface 9 extends from the first surface 6 out into the respective band 1 . 2 . 3 and is at an angle of 15 ° to 20 ° from the perpendicular of the first surface 6 towards the far edge 5 the recess 8th inclined. A second boundary surface is parallel to the second side 7 and a third boundary surface of the recess 8th adjoins the former edge 5 opposite edge 4 and is at an angle of 30 ° to 60 ° from the perpendicular of the second surface 7 towards the far edge 5 the recess 8th inclined. A detailed representation of the recess 8th is in 4 shown.

The boundary surface 9 is used to make a stable connection to the other bands 1 . 2 . 3 to generate by edges 4 the other bands 1 . 2 . 3 be created there. These are the bands 1 . 2 . 3 positioned immediately prior to roll cladding in this manner to each other. When the ribbons 1 . 2 . 3 are not very long, they can simply be put together. When the ribbons 1 . 2 . 3 long rolled up ribbons 1 . 2 . 3 are, they must be aligned during unwinding or unwinding or unwinding over guide rollers or pulleys when conveying in the roller according to each other. After positioning, the result in the 1C) . 2C) and 3C) shown arrangements. In contrast to the 1A) . 2A) . 3A) . 1B) . 2 B) and 3B) are in the 1C) . 2C) and 3C) So the actual arrangements of the bands 1 . 2 . 3 shown to each other.

The two outer bands 1 . 2 are thus arranged at a defined distance from each other and the middle band 3 For example, from above exactly on the two outer bands 1 . 2 always put up an edge 4 of a band 1 . 2 . 3 at a first boundary surface 9 in a recess 8th of another band to be connected to it 1 . 2 . 3 is created. The middle band 3 bridges the distance between the outer bands 1 . 2 ,

Subsequently, the bands 1 . 2 . 3 in a further process step with a cold rolling process, in particular by roll cladding, or with a Walzplattierverfahren, wherein the bands 1 . 2 . 3 be heated, interconnected. The result is in the 1D) . 2D) and 3D) shown in a schematic cross-sectional view. This creates a new third volume 10 from the tapes 1 . 2 . 3 , which consists of three sub-areas or three metallic materials, the original bands 1 . 2 . 3 were formed. The large-area overlap also ensures a stable connection of the different metallic materials, such as the fact that the edges 4 good in the flanks of the boundary surfaces 9 incise or beak. The pressure during roll cladding is first loaded along two lines (namely the edges) 4 ) on the boundary surfaces 9 , Due to the small contact surface creates a high pressure, which leads to a strong deformation and cold-welding of the bands 1 . 2 . 3 leads in these places.

The bands 1 . 2 . 3 are formed during roll cladding, so that the resulting new third band 10 is flatter than the output tapes 1 . 2 . 3 , The connecting line between the metallic materials in the 1D) . 2D) and 3D) but also in the 1E) . 2E) . 3E) . 1F) . 2F) and 3F) are only schematically indicated to understand. In reality, other forms, in particular due to the impression of the edges 4 and the connecting lines will in reality be clearly "frayed" or mixed and less straightforward.

In the 1D) . 2D) and 3D) is the method of making the tape 10 made of at least two different metals and / or metallic alloys already completed and a band according to the invention 10 produced.

In a further subsequent method step, which is used to implement a method for producing strips according to the invention 11 is necessary, the resulting third volume 10 separated by cuts in the 1E) . 2E) and 3E) are indicated by dashed lines. This creates the desired stripes 11 , one each in the 1F) . 2F) and 3F) is shown and can be used as connecting strips for batteries or accumulators to connect the individual battery elements or galvanic cells together and electrically contact.

The advantage of the metal strips produced in this way 11 of two metallic materials is to be seen in that on the one hand, the connection between the two metallic materials is very stable and at the same time the manufacturing process is simple and inexpensive. At least one of the bands does not have to be profiled with the method according to the invention, that is to say not be formed. At the same time, care must not be taken that the shaped recesses 8th fit exactly to a corresponding recess. The strips produced by the methods according to the invention 11 Thus, they are even more stable with respect to the bonding of the metallic materials and at the same time less expensive to produce than the stable compounds known from the prior art (US Pat. US 2011/0 206 943 A1 ) are known.

Alternatively to the generation of stripes 11 like this in the 1 to 3 can also be followed by a stamping process, in which at equal intervals uniform areas of the third band 10 are punched out and so a continuous punched grid (not shown) is generated with juxtaposed uniform units. The stamped grid may for example be a coherent substrate for the mass production of electronic components or assemblies. In this case, the stamped grid is equipped with a variety of electronic components or assemblies in the prestructured units of the stamped grid and attached to the stamped grid and contacted with the stamped grid and / or each other electrically. Subsequently, the populated stamped grid is separated into individual components. The stamped grid and in particular the prestructured units of the stamped grid all have at least two different, in particular interconnected, metals and / or metallic alloys.

4 shows an enlarged schematic cross-sectional view through a band 1 . 2 or 3 with a recess 8th as well as in the 1B) . 2 B) and 3B) is shown. The recess 8th extends from the missing edge 5 in the first area 6 into it and reaches to the opposite edge 4 the second surface 7 , The original form of the not yet profiled or not formed band 1 . 2 . 3 as they are in the 1A) . 2A) and 3A) are shown in 4 indicated by dashed line with long lines.

The recess 8th has three flat boundary surfaces 9 . 12 . 13 on. The first boundary surface 9 extends from the first surface 6 out into the respective band 1 . 2 . 3 in and is at an angle of 15 ° to 20 ° from the perpendicular of the first surface 6 towards the far edge 5 the recess 8th inclined. The second boundary surface 12 is parallel to the second page 7 and the third boundary surface 13 the recess 8th adjoins the former edge 5 opposite edge 4 and is at an angle of about 30 ° to 40 ° from the solder of the second surface 7 towards the far edge 5 the recess 8th inclined.

As geometric sizes are in 4 the following are plotted: α as the angle of the first boundary surface to the perpendicular of the first surface of the band, β as the angle of the third boundary surface to the perpendicular of the second surface of the band, b ₀ as the width of the first surface to the recess, b ₁ as the Width of the second boundary surface, bα, as the width of the first boundary surface in the plane of the first surface of the band, bβ as the width of the third boundary surface in the second surface of the band, h ₁ as the height (thickness) of bands in the region of the second boundary surface of the band Recess and h _ges as the height (thickness) of the tape.

As a preferred embodiment of the present invention, the two outer bands exist 1 . 2 made of copper and the recesses 8th are milled, cut or peeled into the copper strips. The middle band 3 consists of aluminum and is not profiled or reshaped. The geometrical sizes of the copper strips are chosen as follows: total width 45 mm of the strips, α = 17 °, β = 45 °, b ₀ = 38 mm, b ₁ = 5 mm, bα = 0.6 mm, bβ = 1.4 mm, h ₁ = 1.4 mm and h _ges = 3.5 mm. The aluminum strip has a height (thickness) of 4 mm and a width of 114 mm.

Flow chart for inventive method:

Shown is a flow diagram for a method according to the invention, in which long strips, which are present as rolled-up coils, are processed. First of all, three rolled-up metallic metal strips of at least two different metals or alloys are provided. These have an at least approximately rectangular cross-section. A tape is unwound and a recess milled at one edge. The milled band is wound up again. Subsequently, a second tape or the milled same band in the same manner, so that either two bands, each with a recess or a band with two mirror-image recesses.

Theoretically, only one band can be milled out by first providing only two bands, one of which is twice the length of the other band, is milled out, and then the band is separated in the middle of the length and wound up as two coils. Furthermore, theoretically and according to the invention, if only one strip is milled, both recesses can also be milled out in one process step.

The un-formed strip or ribbon is placed in a roll-plating machine along with the milled strip or strips in which the strips are conveyed at equal speed through a roll-platen and fed to the nip in a desired position. A similar Walzplattier machine is for example in the US 4,798,932 A1 described.

Then, all the bands are unrolled and the bands are deflected so that one middle band separates the two other bands, the middle band being made of a different metallic material than the outer ones, and in each of the two milled recesses there is an edge of another band , After inserting the juxtaposed tapes in the nip of the Walzplattiereinrichtung, the strips are rolled and joined together. The resulting from the three bands new tape is then wound up as a spool.

At this point, the inventive method with respect to the production of the tape is already completed. The last three steps shown are optional and represent an exemplary embodiment of a method according to the invention for producing strips according to the invention or a stamped grid according to the invention.

The wound coil of the new tape is clamped in an automated cutting device, unwound there and first cut in the middle in the longitudinal direction and then perpendicular or diagonally thereto, so that strips are formed, each having two, joined together by roll-plating metallic materials.

If a punched grid is to be produced, the wound coil of the new tape is clamped in an automated punching device, unrolled there and stamped the desired structures of the stamped grid in the new band, so that stamped grid arise, each two or three, joined together by roll-plating metallic Have materials.

All process steps can be fully automated. The change of the coils from one device to the other can also be done manually without much effort.

The features of the invention disclosed in the foregoing description, as well as the claims, figures and embodiments may be essential both individually and in any combination for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1

Metallic band / outer band

2

Metallic band / outer band

3

Second metallic band / middle band made of other material

4

Edge / edge remaining during profiling

5

Edge / edge to be removed during profiling

6

First surface / area into which the recess is formed

7

Second surface / first plane plane-parallel surface

8th

recess

9

First boundary surface of the recess / contact surface for the edge of another band

10

Third volume / new band

11

Metallic strip / battery connector

12

Second boundary surface of the recess

13

Third boundary surface of the recess

α

Angle of the first boundary surface to the perpendicular of the first surface of the band

β

Angle of the third boundary surface to the solder of the second surface of the band

b ₀

Width of the first surface to the recess

b ₁

Width of the second boundary surface

B.alpha

Width of the first boundary surface in the plane of the first surface of the band

B.beta

Width of the third boundary surface in the second surface of the band

h ₁

Height (thickness) bands in the area of the second boundary surface of the recess

h _sat

Height (thickness) of the tape

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• US 4798932 A1 [0004, 0098]
• DE 2008018204 A1 [0005]
• US 2011/0206943 A1 [0006, 0090]

Claims (30)

Method for producing a tape ( 10 ) of two different metals and / or metallic alloys of tapes ( 1 . 2 . 3 ), in which the metals and / or the metallic alloys of the strip ( 10 ) are joined together by roll-bonding, characterized by the following, chronologically successive steps: A) providing two first metallic strips ( 1 . 2 ) and a second band ( 3 ) of another metal or other metallic alloy, all 1 . 2 . 3 ) four edges ( 4 . 5 ), two mutually parallel surfaces ( 6 . 7 ) and have an at least approximately rectangular cross section, B) profiling the first bands ( 1 . 2 ) starting from one edge each ( 5 ) in one of the mutually parallel surfaces ( 6 ), wherein during the profiling over the entire length of the first strips ( 1 . 2 ) a recess ( 8th ) by removing material from the first bands ( 1 . 2 ) and this edge ( 5 ) is removed over the entire length to be connected, C) Positioning the bands ( 1 . 2 . 3 ), the first two bands ( 1 . 2 ) are spaced apart, the non-profiled surfaces ( 7 ) of the first bands ( 1 . 2 ) are arranged in a plane next to each other and the recesses ( 8th ) of the first bands ( 1 . 2 ) are arranged mirror-inverted and adjacent to each other, and wherein the second band ( 3 ) in the recesses ( 8th ) of the first bands ( 1 . 2 ) is placed adjacent or overlying and the second band ( 3 ) the distance of the first two bands ( 1 . 2 ) is bridged, and D) connecting the bands ( 1 . 2 . 3 ) with each other by roll-plating the juxtaposed tapes ( 1 . 2 . 3 ), whereby roll-bonding forms a coherent third band ( 10 ) is generated with two parallel surfaces. Method for producing a tape ( 10 ) of two different metals and / or metallic alloys of tapes ( 1 . 2 . 3 ), in which the metals and / or the metallic alloys of the strip ( 10 ) are joined together by roll-bonding, characterized by the following, chronologically successive steps: A) providing two first metallic strips ( 1 . 2 ) and a second band ( 3 ) of another metal or other metallic alloy, all 1 . 2 . 3 ) four edges ( 4 . 5 ), two mutually parallel surfaces ( 6 . 7 ) and have an at least approximately rectangular cross section, B) profiling the second band ( 3 ) starting from one edge each ( 5 ) in one of the mutually parallel surfaces ( 6 ), this area ( 6 ) these two edges ( 5 ), wherein in the profiling over the entire length of the second band to be connected ( 3 ) two recesses ( 8th ) by removing material from the second band (3) and the two edges ( 5 ) over the entire length to be connected by one of the two recesses ( 8th ), C) Positioning the bands ( 1 . 2 . 3 ), the first two bands ( 1 . 2 ) are arranged at a distance from each other and the parallel surfaces ( 6 . 7 ) of the first bands ( 1 . 2 ) are arranged side by side in each case in a plane, and wherein the second band ( 3 ) to the first bands ( 1 . 2 ) adjacent or overlying, that the first two bands ( 1 . 2 ) in a respective recess ( 8th ) of the second band ( 3 ) and that the second band ( 3 ) the distance of the first two bands ( 1 . 2 ) is bridged, and D) connecting the bands ( 1 . 2 . 3 ) with each other by roll-plating the juxtaposed tapes ( 1 . 2 . 3 ), whereby roll-bonding forms a coherent third band ( 10 ) is generated with two parallel surfaces. Method for producing a tape ( 10 ) of two different metals and / or metallic alloys of tapes ( 1 . 2 . 3 ), in which the metals and / or the metallic alloys of the strip ( 10 ) are joined together by roll-bonding, characterized by the following, chronologically successive steps: A) providing two first metallic strips ( 1 . 2 ) and a second band ( 3 ) of another metal or other metallic alloy, all 1 . 2 . 3 ) four edges ( 4 . 5 ), two mutually parallel surfaces ( 6 . 7 ) and have an at least approximately rectangular cross section, B) profiling one of the first bands ( 1 ) and the second band ( 3 ) starting from one edge each ( 5 ) in one of the mutually parallel surfaces ( 6 ), wherein in the profiling over the entire length to be connected of a first band ( 1 ) and the second band ( 3 ) a recess ( 8th ) by removing material from the two bands ( 1 . 3 ) and this edge ( 5 ) is removed over the entire length to be connected, C) Positioning the bands ( 1 . 2 . 3 ), the first two bands ( 1 . 2 ) are arranged at a distance from one another, the parallel surfaces ( 6 . 7 ) of the first bands ( 1 . 2 ) are arranged side by side in each case in a plane, and wherein the second band ( 3 ) in the recess ( 8th ) of the profiled first band ( 1 ) is placed adjacent or overlying, the unprofiled first band ( 2 ) in the recess ( 8th ) of the second band ( 3 ) and the second band ( 3 ) the distance of the first two bands ( 1 . 2 ) is bridged, and D) connecting the bands ( 1 . 2 . 3 ) with each other by roll-plating the juxtaposed tapes ( 1 . 2 . 3 ), whereby roll-bonding forms a coherent third band ( 10 ) is generated with two parallel surfaces. Method according to one of the preceding claims, characterized in that the production of the two recesses ( 8th ) takes place during profiling with a machining technique, preferably by milling. Method according to one of the preceding claims, characterized in that each band ( 1 . 2 . 3 ) consists of only one metal or a metallic alloy, wherein preferably the two first bands ( 1 . 2 ) consist of the same metal or the same metallic alloy. Method according to one of the preceding claims, characterized in that the material from which the bands ( 1 . 2 . 3 ) selected from copper, aluminum, aluminum-based alloys and / or copper-based alloys. Method according to one of the preceding claims, characterized in that when joining the bands ( 1 . 2 . 3 ) with each other by roll-bonding the strips ( 1 . 2 . 3 ), wherein the height of the generated third band ( 10 ) is less than the height of the first bands ( 1 . 2 ) and the second band ( 3 ). A method according to claim 7, characterized in that in the forming of the bands ( 1 . 2 . 3 ) Heat is supplied and the height of the generated third band ( 10 ) is at least 20% less than the height of the three output tapes ( 1 . 2 . 3 ). A method according to claim 7, characterized in that in the forming of the bands ( 1 . 2 . 3 ) no heat is supplied and the height of the generated third band ( 10 ) is at least 40% less than the height of the three output tapes ( 1 . 2 . 3 ). Method according to one of the preceding claims, characterized in that the heights of the two first bands ( 1 . 2 ) and the second band ( 3 ) between 0.5 mm and 5 mm and after roll-plating the generated third band ( 10 ) has a height of 0.1 mm to 2 mm, the height of the generated third band ( 10 ) is less than the height of the first bands ( 1 . 2 ) and the second band ( 3 ). Method according to one of the preceding claims, characterized in that the two first bands ( 1 . 2 ) have a width between 10 mm and 100 mm and the second band ( 3 ) at least as wide as the first bands ( 1 . 2 ) and is up to three times as wide as the first bands ( 1 . 2 ). Method according to one of the preceding claims, characterized in that when profiling the two strips ( 1 . 3 ) or ( 1 . 2 ) or the second band ( 3 ) first an unprofiled tape ( 1 . 2 . 3 ) is unwound from a roll, the recess ( 8th ) is produced by a subtractive method, preferably produced by a cutting technique or a milling technique, and the profiled strip ( 1 . 2 . 3 ) is then rewound into a roll. Method according to one of the preceding claims, characterized in that when profiling the two strips ( 1 . 3 ) or ( 1 . 2 ) or the second band ( 3 ) first an unprofiled tape ( 1 . 2 . 3 ) is unwound from a roll, the recess ( 8th ) is produced by a subtractive method, preferably produced by a cutting technique or a milling technique, and the profiled strip ( 1 . 2 . 3 ) is then rewound into a roll. Method according to one of the preceding claims, characterized in that each profiled band ( 1 . 2 . 3 ), the at least one recess ( 8th ), at least along the length to be joined has the same cross-section. Method according to one of the preceding claims, characterized in that each of the two recesses ( 8th ) having first, second and third planar boundary surfaces ( 9 . 12 . 13 ) is generated, wherein the first boundary surface ( 9 ) and the third boundary surface ( 13 ) to the surface ( 6 ) of the band ( 1 . 2 . 3 ), in which the recess ( 8th ) or the recesses ( 8th ) are generated, are generated inclined towards the second boundary surface ( 12 ) parallel to the plane of this surface ( 6 ) of the band ( 1 . 2 . 3 ) is generated, so that the parallel second boundary surface ( 12 ) between the two inclined boundary surfaces ( 9 . 13 ) is arranged and the first boundary surface ( 9 ) to the surface ( 6 ) of the band ( 1 . 2 . 3 ) borders, in which the recess ( 8th ) or the recesses ( 8th ) be generated. Method according to claim 15, characterized in that the recess ( 8th ) is generated such that the angle (α) of the first boundary surface ( 9 ) to the solder of the surface ( 6 ) of the band ( 1 . 2 . 3 ), in which the recess ( 8th ) or the recesses ( 8th ) is between 7 ° and 25 °, preferably between 15 ° and 20 °, and the angle (β) of the third boundary surface ( 13 ) to the solder of the surface ( 6 ) of the band ( 1 . 2 . 3 ), in which the recess ( 8th ) or the recesses ( 8th ), is between 20 ° and 60 °, preferably between 30 ° and 45 °. A method according to claim 15 or 16, characterized in that the recess ( 8th ) is generated such that the width (b1) of the second boundary surface ( 12 ) is between 2 mm and 10 mm. Method according to one of claims 15 to 17, characterized in that the recess ( 8th ) is generated such that the distance (h1) of the second boundary surface ( 12 ) from the unformed surface ( 7 ) of the band ( 1 . 2 . 3 ) between 60% and 20% of the height (hges) of the band ( 1 . 2 . 3 ) without the recess ( 8th ), preferably between 25% and 40%. Method according to one of the preceding claims, characterized in that the distance of the two first bands ( 1 . 2 ) is adjusted such that the edges ( 4 ) in the recesses ( 8th ) adjacent bands ( 1 . 2 . 3 ) on inclined boundary surfaces ( 9 . 13 ) of the recesses ( 8th ), preferably on the first boundary surfaces ( 9 ) of the recesses ( 8th ) issue. Method for producing a plurality of strips ( 11 ) of two different metals and / or metallic alloys from tapes ( 1 . 2 . 3 ), in which the metals and / or metallic alloys are firmly bonded together by roll-bonding, the strips ( 11 ) from a band ( 10 ) produced by the method steps according to one of the preceding claims, wherein after the production of the third strip ( 10 ) the following method step takes place: E) the third band ( 10 ) is placed in strips ( 11 ) separated. A method according to claim 20, characterized in that with the method a plurality of battery connectors ( 10 ) or accumulator connector ( 10 ) getting produced. Method according to one of claims 20 or 21, characterized in that the separation of the generated third band ( 10 ) by cutting or punching in the longitudinal direction of the third band ( 10 ) in the metal or metallic alloy of the second band ( 3 ) and the strips ( 11 ) by parallel cuts or parallel cuts perpendicular or diagonal to the longitudinal direction of the third band ( 3 ) be generated. Method according to one of claims 20 to 22, characterized in that in step E) the generated third band ( 10 ) in stripes ( 11 ), which in each case exactly one connection of two different materials of a first band ( 1 . 2 ) and the second band ( 3 ), the area of the third band ( 10 ), from the second volume ( 3 ) is separated and perpendicular or diagonal to several separations for the production of strips ( 11 ) respectively. Use of metallic strips ( 11 ) produced by a method according to one of claims 20 to 23 for electrically contacting at least two battery elements or at least two galvanic elements. Method for producing a stamped grid of two or three different metals and / or metallic alloys from strips ( 1 . 2 . 3 ), in which the metals and / or metallic alloys are firmly joined together by roll-bonding, wherein the stamped grid is made of a strip ( 10 ) prepared by the process steps according to any one of claims 1 to 19, wherein after the production of the third strip ( 10 ) the following method step takes place: E) the third band ( 10 ) is made by punching out areas of the third band ( 10 ) formed in the stamped grid. Metallic strip ( 11 ) consisting of two different metals and / or metal alloys, produced by a method according to one of claims 20 to 23. Metallic band ( 10 ) consisting of at least two different metals and / or metal alloys, produced by a method according to one of claims 1 to 19. Punching grid consisting of two or three different metals and / or metal alloys, produced by a method according to claim 25. Battery having a plurality of battery elements or a plurality of galvanic cells, wherein the battery elements or galvanic cells with metallic strips ( 11 ) are electrically connected according to claim 26. Battery according to claim 29, characterized in that the battery elements or the galvanic cells with the strips ( 11 ) are electrically connected.

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