Semi-finished product for the production of a heat exchanger, method for producing such a semi-finished product, method for producing a heat exchanger, heat exchanger and vehicle with the same

Abstract

The present invention relates to a semi-finished product (5) for the production of a heat exchanger. It is essential for the invention that the semi-finished product (5) has a plate (3) to which an adhesive layer (4) made of a hot melt adhesive is applied. The invention further relates to a method for producing such a semi-finished product and to a method for producing a heat exchanger. The invention further relates to a heat exchanger having a base plate (2) and such a semi-finished product (5), which form or delimit a cooling channel through which fluid can flow between them. It is provided that the base plate (2) and a plate (3) of the semi-finished product (5) are connected to one another by an adhesive layer (4) made of a hot melt adhesive pre-applied to the plate (3) of the semi-finished product (5). The invention further relates to a vehicle having at least one such heat exchanger.

Description

The invention relates to a semi-finished product for the production of a heat exchanger according to the subject matter of claim 1. The invention further relates in particular to a method for producing such a semi-finished product and to a method for producing a heat exchanger. The invention relates, finally, to a heat exchanger and, in particular, to a vehicle having such a heat exchanger.In radiator construction, various embodiments for heat exchangers are known, in particular plate heat exchangers or cooling plate arrangements for battery cells for electric vehicles. They generally have at least two plates stacked one above the other, which form between them a cooling channel through which, for example, oil or water can flow. The plates are usually tightly soldered or tightly welded together at their edges. From the standpoint of process engineering, however, soldering and welding processes are associated with numerous disadvantages. Mention should be made above all of relatively high process costs and the use of chemicals. Furthermore, the soldering and welding processes are comparatively time-consuming and cost-intensive. A further disadvantage is that during the soldering or welding of the edges, the original strength of the plates is significantly adversely affected because of the relatively high heat input into the material. In addition, it is usually the case in soldering and welding processes that only materials of the same type can be connected to one another.The object of the invention is therefore to provide an improved or at least one other embodiment for a heat exchanger. Furthermore, attempts should be made to improve the production of such a heat exchanger from an economic as well as from an ecological point of view.In the present invention, this object is achieved in particular by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims and the description.The invention has recognized that an improved heat exchanger can be provided by bonding the plates of the heat exchanger rather than being soldered or welded as it was. The invention has furthermore recognized that an adhesive, in particular a hot melt adhesive, can advantageously be used in this case and furthermore the production of such an adhesively bonded heat exchanger can be improved on the basis of prefabricated semifinished products for the production of heat exchangers.Accordingly, a semi-finished product for the production of a heat exchanger is proposed, which comprises a plate and an adhesive layer. It is essential for the invention that the adhesive layer is formed by an adhesive applied to said plate, in particular a hot melt adhesive. The adhesive layer can preferably be continuous without gaps and / or thin in the form of a film. On the basis of the proposed semi-finished product, a heat exchanger which is glued as it were can be provided, which can be produced relatively cost-effectively and at the same time is of relatively lightweight construction in comparison with known heat exchangers in which the plates are usually soldered or welded to one another. This is due to the fact that the production of a corresponding heat exchanger on the basis of the semi-finished product provided is carried out relatively rapidly and, in addition, installation technology for the soldering and welding processes can be saved. Furthermore, when producing a corresponding heat exchanger on the basis of such a semi-finished product, cost-intensive soldering additives or welding additives can be completely dispensed with. Furthermore, the plates of the heat exchanger maintain their original strength practically unchanged during bonding, since the introduction of temperature into the plate material, i.e. the thermal load, is comparatively low during bonding. This allows the plates of the heat exchanger to be made with a thickness less than that since then, which lowers the overall weight and saves plate material. It should also be emphasized that the semifinished product according to the invention and the heat exchanger according to the invention can be produced in a comparatively environmentally friendly manner, since it is possible in particular to dispense with the use of critical chemicals such as fluxes and the like.Said adhesive is expediently a hot melt adhesive.Said hot melt adhesive, which is also known as a hot melt adhesive or hot melt, can be liquefied by heating to processing temperatures of approximately 100° C. to 280° C. or less, so that it can be applied to components to be connected to one another. During a subsequent cooling, the hot melt adhesive solidifies again, a firm adhesive bond being formed. Because of the relatively low processing temperatures, the thermal load on the components wetted with the hot-melt adhesive is relatively low, so that the strength of the components remains virtually unchanged. In addition, components of different material groups can also be connected to one another. The adhesive bond produced with the hot melt adhesive is reversible, i.e. releasable, or irreversible, i.e. non-non-destructively releasable, depending on the chemical composition of the hot melt adhesive. A reversible adhesive bond can expediently be achieved with a hot melt adhesive without chemical postcrosslinking, for example a thermoplastic hot melt adhesive (hotmelt). An irreversible adhesive bond can be expediently achieved with a hot melt adhesive with chemical postcrosslinking.Furthermore, it is expedient if the said adhesive, in particular a hot melt adhesive, is a polyolefin-based hot melt adhesive. As a result, the base polymer of the adhesive used is a polyolefin. In this way, preferred material properties of the adhesive layer can be adjusted with respect to adhesion, cohesion and temperature behavior. An adhesive bond produced with this adhesive, in particular a hot melt adhesive, is expediently completely reversible, i.e. the adhesive bond can be released in a non-destructive manner. This opens up, for example, the possibility of simple repair of a bonded heat exchanger.In particular, it can be provided that the adhesive, in particular a hot melt adhesive, is dry to the touch at room temperature. It is expedient here if the adhesive, in particular a hot melt adhesive, is present in a touch-dry manner in the delivery state of the semi-finished product. The term "dry to the touch" in the sense of the invention expediently means that the adhesive, in particular a hot melt adhesive, is not tacky at room temperature. This means that objects do not stick to the adhesive when in contact with the adhesive, in particular a hot melt adhesive. A temperature of 20° C. can be assumed as room temperature, for example. The adhesive, in particular a hot melt adhesive, can, if it is present in a touch-dry state, be in a fully solidified state or a partially solidified state in which the adhesive, in particular a hot melt adhesive, is not tacky at least on its surface accessible from the outside. This prevents, in particular, unintentional adhesion and, if appropriate, contamination of tools, transport means and the like.Said plate of the semi-finished product is expediently produced from a metallic material, for example a sheet metal plate or an aluminum plate. The plate of the semi-finished product can alternatively be made of a plastic or composite material and therefore in particular form a plastic plate or a composite plate. This is because in the present case an adhesive bonding of the plates of the heat exchange is provided and therefore the severe restrictions with respect to possible material pairings that apply during the soldering and welding process do not engage.According to a further basic idea of the invention, a method for producing a semi-finished product, in particular the semi-finished product according to the invention described above, is proposed, which is suitable for producing a heat exchanger. In the context of the proposed method, it is provided that:providing an adhesive film of consolidated, film-like shaped adhesive, in particular a hot melt adhesive, which is moving at a tape speed in the range from 0.5 meter / minute to 50.0 meter / minute or in the range from 0.5 meter / minute to 200.0 meter / minute, for example,providing a material belt moving at a belt speed in the range from 0.5 meter / minute to 50.0 meter / minute or in the range from 0.5 meter / minute to 200.0 meter / minute, for example,wherein the adhesive film and the material strip are guided through a first processing station, expediently formed by a pair of pressing rollers, in which the adhesive film is pressed onto the material strip, in particular with a pressure in the range of greater than 0 N / cm 2 to 90 N / cm 2, preferably in the range of greater than 0 N / cm 2 to 30 N / cm 2, and further preferably in the range of greater than 0 N / cm 2 to 20 N / cm 2 so that the adhesive film and the material strip form a loosely contactingly contiguous composite,wherein the composite is guided through a second processing station, expediently formed by a heating device and / or by a pair of rollers or a plurality of pairs of rollers, in which the composite is heated, in particular to a processing temperature in the range from 100° C. to 280° C., and / or is rolled, in particular with a pressure in the range from greater than 0 N / cm 2 to 90 N / cm 2, so that the composite is converted into a semi-finished strand in which the adhesive, in particular a hot-melt adhesive, of the adhesive film is melted and arranged as a continuous adhesive layer on the material strip,wherein the semi-finished product strand is guided through a third processing station, expediently formed by a cooling device and / or by a pair of rollers or a plurality of pairs of rollers, in which the semi-finished product strand is cooled and / or rolled, wherein the adhesive layer is present in a touch-dry manner at room temperature.The semi-finished product strand provided therewith is, in the sense of the invention, a semi-finished product which can be used for the production of a heat exchanger. The production method for the semi-finished product is cost-effective and environmentally friendly, since neither additional soldering materials or additional welding materials have to be used nor the use of chemicals is necessary. In addition, the introduction of temperature into the material strip within the scope of the method specified, i.e. the thermal load of the material strip, is comparatively low, so that an original strength of the material strip is maintained.An "adhesive film" may conveniently be or form an adhesive tape.Said adhesive film may be provided as an endless belt on an adhesive film roll. Furthermore, the material belt can be provided as an endless belt on a material belt roll. As a result, both the adhesive, in particular a hot-melt adhesive, and the material strip are stored, so that the proposed method can be carried out continuously, viewed over a certain period of time. This allows the costs for the provision of the semi-finished products to be further reduced.Said material strip is expediently produced from a metallic material, for example a sheet metal strip or an aluminium sheet strip. The material band may alternatively be made of a plastic or composite material and therefore in particular form a plastic band or a composite band. This is because in the present case an adhesive bonding of the plates of the heat exchange is provided and therefore the severe restrictions with respect to possible material pairings that apply during the soldering and welding process do not engage. For the adhesive used in the context of the method for producing a semi-finished product, in particular a hot melt adhesive, the above applies analogously.It is further expedient if the semi-finished product strand, after passing through the third processing station, is guided through a fourth processing station in which the semi-finished product strand is subjected to a quality test. Quality defects in the semi-finished product strand, in particular air bubbles and the like unwanted defects, can thus be found. Corresponding quality defects can be removed from the semi-finished product strand, for example, by cutting, in particular punching, so that the provision of the semi-finished product and the subsequent production of a heat exchanger on the basis of the semi-finished product is possible with high quality. In this way, in particular a conventional laminating installation can be dispensed with, as a result of which the production of a semi-finished product according to the proposed method is even more cost-effective.It is expedient if the first processing station is preceded by a charging station for electrostatically charging the adhesive film and / or the material strip. In this case, the adhesive film and the material strip are guided jointly through the charging station, wherein the adhesive film and / or the material strip are electrostatically charged in the charging station. The electrostatic charging can take place in particular with an electrical voltage of less than or equal to 60 kV. This makes it possible to ensure complete, in particular defect-free and preferably bubble-free, contact of the adhesive film on the material strip.It is furthermore expedient if an input band buffer is connected upstream of the charging station. The input tape buffer has a first buffer section for the adhesive film and a second buffer section for the material tape, wherein the adhesive film is guided through the first buffer section of the input tape buffer and the material tape is guided through the second buffer section of the input tape buffer. The first buffer portion is configured to store a tape length of the adhesive film and / or to influence a tape speed of the adhesive film. The second buffer section is designed in an analogous manner to store a strip length of the material strip and / or to influence a strip speed of the material strip. Alternatively or additionally, it can be provided that the third processing station or the fourth processing station is followed by an output belt buffer for the semi-finished product strand, through which the semi-finished product strand is guided. The output belt buffer is designed to store a belt length of the semi-finished strand and / or to influence a belt speed of the semi-finished strand. By means of corresponding band buffers, variations in the band length and / or variations in the band speed can be compensated.Furthermore, it can be provided that the semi-finished product strand is wound onto a supply roll after leaving the third processing station or after leaving the fourth processing station or after leaving the output band buffer. Alternatively, it can be provided that the semi-finished product strand, after leaving the third processing station or after leaving the fourth processing station or after leaving the starting belt buffer or after transport and within the scope of further processing, is guided through a fifth processing station in which the semi-finished product strand provided is converted into semi-finished products having a predetermined contour, in particular by cutting, punching or embossing. The semi-finished products provided each have the said plate of the semi-finished product, which is formed by the material strip of the semi-finished strand, and the adhesive applied thereto, in particular a hot-melt adhesive, in the form of the adhesive layer. As a result, either a semi-finished product strand on a supply roll, which can be transported, stored and further processed at a later point in time in particular, or pre-finished products for the production of heat exchangers are provided.According to a further basic idea of the invention, a method for producing a heat exchanger is proposed. In the context of the proposed method, it is provided that:providing a base plate,a semi-finished product is provided which is formed according to the preceding semi-finished product according to the invention and / or which is produced according to the method according to the invention for producing a semi-finished product,wherein the base plate and the semi-finished product are arranged opposite each other such that the adhesive layer of the semi-finished product is arranged contacting the base plate and a preassembled heat exchanger is formed,wherein the preassembled heat exchanger is heated by a heating field to a processing temperature in the range from 100° C. to 280° C.,wherein the preassembled heat exchanger is subsequently acted upon by means of a fixing press at the processing temperature in the range from 100° C. to 280° C. and with a processing pressure in the range from greater than 0.01 N / cm 2 to 10 N / cm 2 wherein the processing temperature and the processing pressure are maintained for a period of from 0.5 minutes to 10 minutes,wherein the preassembled heat exchanger is subsequently cooled by means of the fixing press and is held at a holding temperature in the range from 10° C. to 105° C. and is subjected to a holding pressure in the range from greater than 0.01 N / cm 2 to 10 N / cm 2 wherein the holding temperature and the holding pressure are maintained for a period from 0.5 minutes to 10 minutes.As a result, a cost-effective and lightweight heat exchanger, in particular a plate heat exchanger or a cooling plate arrangement for a vehicle battery for an electric vehicle, can be provided, which combines the advantages explained above in itself. Said heating field can be realized by a radiation-based heating element, for example an infrared heating element or a convective heating element. Alternatively, the heating field can also be realized by an induction device or a mirror deflection for deflecting and guiding heating radiation. The temperatures required for melting the adhesive, in particular a hot melt adhesive, can thus be introduced rapidly and efficiently into the workpiece, as a result of which significantly higher cycle times, in particular strip speeds, can be realized.Said base plate is suitably made of a metallic material, for example a sheet metal plate or an aluminium plate. The base plate may alternatively be made of a plastic or composite material and therefore in particular form a plastic plate or a composite plate. This is because in the present case an adhesive bonding of the plates of the heat exchange is provided and therefore the severe restrictions with respect to possible material pairings that apply during the soldering and welding process do not engage. For the adhesive used in the context of the method for producing a heat exchanger, in particular a hot melt adhesive, the above applies analogously.According to a further basic idea of the invention, a heat exchanger, in particular a plate heat exchanger or a cooling plate arrangement for a vehicle battery for an ejector vehicle, is proposed, which has a base plate and a prefabricated semi-finished product, which is designed in particular according to the preceding description and / or is produced according to the preceding description. The base plate and the semi-finished product form or delimit between them a cooling channel through which fluid, in particular oil or water, can flow. It is essential that the base plate and the plate of the semi-finished product are connected to one another by the adhesive layer of the semi-finished product, which consists of the adhesive, in particular a hot melt adhesive, pre-coated onto the plate of the semi-finished product. As a result, a bonded heat exchanger is provided which, in comparison with known heat exchangers in which plates are usually soldered or welded to one another, can be produced relatively cost-effectively and at the same time is of relatively lightweight construction. This is because cost-intensive soldering additives or welding additives can be completely dispensed with. Furthermore, the sheets retain their original strength practically unchanged during bonding, since the introduction of temperature into the sheet material, i.e. the thermal load, is comparatively low. This allows the panels to be made with a thickness less than that since then, which reduces weight and saves cost-intensive panel material. It should also be emphasized that the heat exchanger according to the invention can be produced in a comparatively environmentally friendly manner, since in particular the use of critical chemicals such as fluxes and the like can be dispensed with.It is expedient if the adhesive, in particular a hot melt adhesive, is a polyolefin-based hot melt adhesive. As a result, the base polymer of the adhesive used is a polyolefin. In this way, preferred material properties of the adhesive layer can be adjusted with respect to adhesion, cohesion and temperature behavior. An adhesive bond produced with this adhesive, in particular a hot melt adhesive, is completely reversible, i.e. the adhesive bond can be released in a non-destructive manner. In practice, a polyolefin-based hot melt adhesive is also referred to in particular as a hot melt.It is further expedient if the base plate of the heat exchanger is a channel plate formed in a channel-like manner by forming and the plate of the semi-finished product is a substantially planar cover plate. This specifies a substantially planar cooling plate arrangement for a vehicle battery for an electric vehicle, for example, which has two plates bonded to one another. By gluing the two plates together, the cooling plate arrangement can be manufactured relatively cost-effectively and in a robust manner. Moreover, the cooling plate arrangement is at the same time relatively light in weight. It is understood that alternatively the plate of the semi-finished product can be provided by forming as a channel plate formed in a channel-like manner and the base plate of the heat exchanger as a substantially planar cover plate.It is furthermore expedient if the heat exchanger has a predefined number of base plates and a predefined number of semi-finished products with plates. In this case, the base plates and the plates of the semi-finished products are stacked one on top of the other in alternating sequence, wherein adjacent plates are connected to one another by an adhesive layer made of an adhesive, in particular a hot-melt adhesive, which is respectively pre-coated onto the plates of the semi-finished products. This specifies a plate heat exchanger which has a plate stack comprising a plurality of plates stacked one on top of the other in alternating sequence. The plates are glued to one another, so that the plate heat exchanger can be produced relatively cost-effectively and at the same time is of relatively lightweight construction.Said base plate is suitably made of a metallic material, for example a sheet metal plate or an aluminium plate. The base plate may alternatively be made of a plastic or composite material and therefore in particular form a plastic plate or a composite plate. This is because in the present case an adhesive bonding of the plates of the heat exchange is provided and therefore the severe restrictions with respect to possible material pairings that apply during the soldering and welding process do not engage. For the adhesive used in the context of the method for producing a heat exchanger, in particular a hot melt adhesive, the above applies analogously.According to a further basic idea of the invention, a vehicle, in particular an electric vehicle, is proposed, which has at least one heat exchanger according to the invention or at least one heat exchanger produced according to the method according to the invention for producing a heat exchanger.In summary, the present invention relates preferably to a semi-finished product for the production of a heat exchanger. It is essential for the invention that the semi-finished product has a plate to which an adhesive layer made of an adhesive, in particular a hot-melt adhesive, is applied. The invention further relates to a method for producing such a semi-finished product and to a method for producing a heat exchanger. The invention further relates to a heat exchanger with a base plate and such a semi-finished product, which form or delimit between them a cooling channel through which fluid can flow. It is provided here that the base plate and a plate of the semi-finished product are connected to one another by an adhesive layer made of an adhesive, in particular a hot-melt adhesive, that is pre-coated onto the plate of the semi-finished product. The invention further relates to a vehicle having at least one such heat exchanger.Further important features and advantages of the invention are evident from the dependent claims, from the drawings and from the associated description of the figures with reference to the drawings.It is understood that the features mentioned above and those still to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention.Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally the same components.They show, in each case schematically FIG. 1 shows a device for carrying out the method according to the invention for producing a semi-finished product for producing a heat exchanger, FIG. 2 shows a graph of preferred temperature and pressure profiles which can be set within the scope of the method according to the invention for producing a semi-finished product for producing a heat exchanger, and FIGS. 3-5 show successive steps of the method according to the invention for producing a heat exchanger.FIG. 1 shows a preferred embodiment of a device denoted overall by 7, which is designed to carry out the method according to the invention for producing a semi-finished product 5 for producing a heat exchanger.Within the scope of the method according to the invention for producing the semi-finished product 5, the provision of starting materials is first provided, namely an adhesive film 6, which is provided in an exemplary manner such that it can be unwound on an adhesive film roll 26 as an endless film, on the one hand, and a material strip 8, in particular a sheet metal strip, an aluminum sheet strip, a plastic strip or a composite strip, which is provided in an exemplary manner such that it can be unwound on a material strip roll 27 as an endless strip, on the other hand. The adhesive film 6 is a consolidated hotmelt adhesive, in particular a consolidated polyolefin-based hotmelt adhesive, which is present in sheet-like form. The adhesive film 6 could therefore also be referred to as an adhesive film. The adhesive film 6 and the material tape 8 are preferably each unwound from the rollers 26, 27 and moved away with a tape speed in the range from 0.5 meter / minute to 50.0 meter / minute or preferably up to 200.0 meter / minute; the tape movement directions are indicated in FIG. 1 by corresponding arrows.According to FIG. 1, it is provided that the device 7 has an input tape buffer, generally designated 21, which has a first buffer section 22 for the adhesive film 6 and a second buffer section 23 for the material tape 8. The unwound adhesive film 6 is introduced into the first buffer section 22 of the input belt buffer 21 downstream of the adhesive film roll 26 and passes through the latter, wherein the first buffer section 22 is designed to store a belt length of the adhesive film 6 and / or to influence the belt speed of the adhesive film 6. Analogously, the unwound material strip 8 is introduced into the second buffer section 23 of the input strip buffer 21 downstream of the material strip roll 27 and passes through the latter, wherein the second buffer section 23 is configured to store a strip length of the material strip 8 and / or to influence the strip speed of the material strip 8.The device 7 has a first processing station 10 which is connected downstream of the input belt buffer 21 and which can be formed, for example, by a pair of contact pressure rollers 11. In the context of the method according to the invention, it is provided that the adhesive film 6 and the material strip 8 are guided jointly through the first processing station 10, wherein the adhesive film 6 is pressed onto the material strip 8 by means of the first processing station 10, so that the adhesive film 6 and the material strip 8 are transferred into a contiguous composite 12 in a touching manner. The first processing station 10 preferably works with a contact pressure in the range of greater than 0 N / cm 2 to 90 N / cm 2.Purely by way of example, in the present case, the first processing station 10 is preceded by a so-called charging station 9, which serves for electrostatically charging the adhesive film 6 and / or the material strip 8. This is achieved by the adhesive film 6 and the material strip 8 being sent together through the charging station 9, wherein the adhesive film 6 and / or the material strip 8, which expediently still have a certain distance from one another, are electrostatically charged with an electrical voltage of less than or equal to 60 kV by means of the charging station 9. Due to the electrostatic charge, the contact of the adhesive film 6 with the material tape 8 can be improved. Thus, for example, disturbing air inclusions which form bubbles in the belt can be prevented. However, the electrostatic charge of the adhesive film 6 and / or of the material strip 8 is optional.The composite 12 of adhesive film 6 and material strip 8 present after the first processing station 10 is guided downstream of the first processing station 10 through a second processing station 13 of the device 7 according to the method according to the invention. This is formed, for example, by a heating device 14 and / or a pair of rollers or a plurality of pairs of rollers 15. It is provided that, when passing through the second processing station 13, the composite 12 is heated, for example, stepwise or continuously to a processing temperature in the range from 100° C. to 280° C. and / or is rolled with a contact pressure in the range from greater than 0 N / cm 2 to 90 N / cm 2. As a result, the adhesive film 6 liquifies on the material strip 8 and the composite 12 is converted into a semi-finished strand 16, in which the hot-melt adhesive of the adhesive film 6 melts and is present as a continuous, i.e. contiguous, adhesive layer 4 on the material strip 8.The semi-finished product strand 16 provided is then, in the still hot state, led out of the second processing station 13 into a downstream third processing station 17 expediently formed by a cooling device 18 and / or by a roller pair or a plurality of roller pairs 19, in which the semi-finished product strand 16 is cooled and / or rolled stepwise or continuously. The adhesive layer 4 cools down so that it then solidifies at room temperature or in a temperature window of 10° C. to 105° C. and is dry to the touch. As a result, a semi-finished product 5 in the form of an endless semi-finished product strand 16 is provided, which can be used as starting material for the production of a heat exchanger. The proposed production method for the semi-finished product 5 is cost-effective and environmentally friendly, since neither additional soldering materials or additional welding materials have to be used nor the use of chemicals is necessary. In addition, the introduction of temperature into the material strip 8 is comparatively low within the scope of the specified method, so that an original strength of the material strip 8 is maintained.In the present case, it is also provided in FIG. 1 that the semi-finished product strand 16 is guided through a fourth processing station 20 after passing through the third processing station 17, which is symbolized by a box in FIG. 1. In this processing station, the semi-finished product strand 16 is subjected to a quality test, so that quality defects, in particular air bubbles and the like unwanted objects, can be detected in the semi-finished product strand 16 and can be removed, for example.Furthermore, in the present case, the device 7 is equipped with an output belt buffer 24 for the semi-finished product strand 16 downstream of the third processing station 17 and the fourth processing station 20. The semi-finished product strand 16 is guided through the output belt buffer 24, wherein the output belt buffer 24 is designed to store a belt length of the semi-finished product strand 16 and / or to influence a belt speed of the semi-finished product strand 16. This can accommodate variations in the tape length and / or variations in the tape speed.In the present case, it is furthermore provided that the semi-finished product strand 16 is wound onto a supply roll 25 after leaving the output belt buffer 24. The correspondingly stored semi-finished product strand 16 can then be easily transported away and further processed elsewhere. Alternatively, the semi-finished product strand 16 could be guided after leaving the exit belt buffer 24 through a fifth processing station, not shown, in which the semi-finished product strand 16 is directly transferred into individual semi-finished products 5 having a predetermined contour. This could be accomplished, for example, by a cutting, punching or embossing step. A correspondingly cut semi-finished product 5 then has a plate 3 formed by the material strip 8 and the adhesive layer 4 made of hot-melt adhesive pre-coated on the plate 3.FIG. 2 shows a graph of preferred temperature and pressure profiles which can be set within the scope of the method according to the invention for producing the semi-finished product 5 for producing a heat exchanger, for example when passing through the second processing station 13 and / or third processing station 17. The process time is plotted on the abscissa in, for example, minutes and the temperature in ° C. and the pressure in N / cm 2 are plotted on the ordinate. It can be seen that the composite 12 is heated to a processing temperature in the range from 100° C. to 280° C. and then cooled, wherein in the present case a line T 1 indicates a temperature profile with comparatively high or maximum temperatures. Furthermore, a line T 2 can be seen which in the present case indicates a temperature profile with comparatively low or minimum temperatures. Furthermore, a dashed line T 3 is drawn, which in the present case indicates an ideal or preferred or average temperature profile, at which the temperatures lie between those of the line T 1 and line T 2. Furthermore, as mentioned, two different pressure profiles can be seen in FIG. 2, wherein the composite 12 is rolled with a contact pressure in the range from 0 N / cm 2 to 90 N / cm 2. A pressure curve P1 indicated by a dot-dash line indicates comparatively high or maximum pressures. In addition, a dash-double-dotted line represents a further pressure curve P2 which is distinguished by comparatively low or minimum pressures.FIG. 3 shows, by way of example, an individual semi-finished product 5 produced according to the proposed method. It has a flat plate 3 to which an adhesive layer 4 made of said hot melt adhesive is applied. The semi-finished product 5 is present at room temperature, wherein the hot melt adhesive is dry to the touch, i.e. is not tacky, which considerably simplifies handling in the production of a heat exchanger described below.According to the method for manufacturing a heat exchanger illustrated in Figures 3-5, it is provided that said semi-finished product 5 and a base plate 2, for example a planar metallic plate, in particular a sheet metal plate or an aluminum plate, a plastic plate or a composite plate, are provided. The base plate 2 can be, for example, a channel component formed in a channel-like manner by forming, and the plate 3 of the semi-finished product 5 can be a substantially planar cover component. The base plate 2 and the semi-finished product 5 are then arranged opposite each other in such a way that the adhesive layer 4 of the semi-finished product 5 is arranged contacting the base plate 2 and a preassembled heat exchanger 29 is formed. According to the method, it is provided that the preassembled heat exchanger 29 is then heated by a heating field 30, which is indicated in the present case by a box drawn with dashed line, to a processing temperature in the range from 100° C. to 280° C. Subsequently, the heated, preassembled heat exchanger 29 is acted upon by means of a fixing press 31, which is only schematically shown, at the processing temperature in the range from 100° C. to 280° C. and with a processing pressure in the range from greater than 0.01 N / cm 2 to 10 N / cm 2 wherein said processing temperature and said processing pressure are maintained for a period of time from 0.5 minutes to 10 minutes. The preassembled heat exchanger 29 is then cooled by means of the fixing press 31 to a holding temperature in the range from 10° C. to 105° C. and held at the holding temperature. At the same time, the preassembled heat exchanger 29 is subjected to a holding pressure in the range of greater than 0.01 N / cm 2 to 10 N / cm 2 by means of the fixing press 31. The holding temperature and the holding pressure are maintained for a period of 0.5 minutes to 10 minutes. As a result, the preassembled heat exchanger 29 is transferred into a heat exchanger or, if appropriate, into a component for such a heat exchanger.

Claims

Semi-finished product (5) for producing a heat exchanger, - having a plate (3) to which an adhesive forming an adhesive layer (4), in particular a hot melt adhesive, is applied.Semi-finished product (5) according to claim 1, characterised in that - the adhesive, in particular a hot melt adhesive, is a polyolefin-based adhesive.Semi-finished product (5) according to claim 1 or 2, characterised in that - the adhesive, in particular a hot melt adhesive, is dry to touch at room temperature.Method for producing a semi-finished product (5) for producing a heat exchanger, - wherein a moving adhesive film (6) is provided from consolidated, film-like shaped adhesive, in particular a hot melt adhesive, - wherein a moving material strip (8) is provided, - wherein the adhesive film (6) and the material strip (8) are guided through a first processing station (10), in which the adhesive film (6) is fed onto the material strip (8), in particular with a pressure in the range of greater than 0 N / cm 2 to 90 N / cm 2, preferably in the range of greater than 0 N / cm 2 to 40 N / cm 2, further preferably in the range between greater than 0 N / cm 2 to 20 N / cm 2, is pressed on, so that the adhesive film (6) and the material strip (8) form a loosely contactingly contiguous composite (12), - wherein the composite (12) is guided through a second processing station (13), in which the composite (12) is heated, in particular to a processing temperature in the range from 100° C. to 280° C., and / or is rolled, in particular with a pressure in the range from greater than 0 N / cm 2 to 90 N / cm 2, so that the composite (12) is converted into a semi-finished product strand (16), in which the adhesive, in particular a hot-melt adhesive, is heated and / or rolled, in particular with a pressure in the range from greater than 0 N / cm to 90 N / cm , the semi-finished product strand (16) is melted and / or rolled as a continuous adhesive layer (4) on the material strip (8), - wherein the semi-finished product strand (16) is guided through a third processing station (17), in which the semi-finished product strand (16) is cooled and / or rolled, wherein the adhesive layer (4) is dry to the touch at room temperature.Method according to Claim 4, characterized in that - after passing through the third processing station (17), the semi-finished product strand (16) is guided through a fourth processing station (20), in which the semi-finished product strand (16) is subjected to a quality test.Method according to Claim 4 or 5, characterized in that - the first processing station (10) is preceded by a charging station (9) for electrostatically charging the adhesive film (6) and / or the material strip (8), - the adhesive film (6) and the material strip (8) being guided jointly through the charging station (9) in which the adhesive film (6) and / or the material strip (8) are electrostatically charged.Method according to Claims 4 to 6, characterized in that - an input band buffer (21) is connected upstream of the charging station (9), the input band buffer (21) having a first buffer section (22) for the adhesive film (6) and a second buffer section (23) for the material band (8), the adhesive film (6) being guided through the first buffer section (22) of the input band buffer (21), the material band (8) being guided through the second buffer section (23) of the input band buffer (21), the first buffer section (22) being designed to store a band length of the adhesive film (6) and / or to influence a band speed of the adhesive film (6), the second buffer section (23) being designed to store a band length of the adhesive film (6) and to influence a band speed of the adhesive film (6), a strip length of the material strip (8) and / or to influence a strip speed of the material strip (8), and / or - an initial strip buffer (24) for the semi-finished strand (16) is arranged downstream of the third processing station (17) or the fourth processing station (20), wherein the semi-finished strand (16) is guided through the initial strip buffer (24), wherein the initial strip buffer (24) is configured to store a strip length of the semi-finished strand (16) and / or to influence a strip speed of the semi-finished strand (16).Method according to one of Claims 4 to 7, characterized in that - the semi-finished product strand (16) is wound onto a storage roll (25) after leaving the third processing station (17) or after leaving the fourth processing station (20) or after leaving the starting strip buffer (24), or - the semi-finished product strand (16) is guided through a fifth processing station after leaving the third processing station (17) or after leaving the fourth processing station (20) or after leaving the starting strip buffer (24), in which fifth processing station the semi-finished product strand (16) is converted, in particular cut, stamped or stamped, into semi-finished products (5) having a predefined contour.Method for producing a heat exchanger, - wherein a base plate (2) is provided, - wherein a semi-finished product (5) is provided which is formed according to one of Claims 1 to 3 and / or is produced according to one of Claims 4 to 8, - wherein the base plate (2) and the semi-finished product (5) are arranged opposite one another such that the adhesive layer (4) of the semi-finished product (5) is arranged in contact with the base plate (2) and a preassembled heat exchanger (29) is formed, - wherein the preassembled heat exchanger (29) is heated by a heating field (30) to a processing temperature in the range from 100°C to 280°C, wherein the preassembled heat exchanger (29) is subsequently subjected to a processing pressure in the range from 100° C. to 280° C. using a fixing press (31) and to a processing pressure in the range from greater than 0.01 N / cm 2 to 10 N / cm 2 wherein the processing temperature and the processing pressure are maintained for a period from 0.5 minutes to 10 minutes, - wherein the preassembled heat exchanger (29) is subsequently cooled by means of the fixing press (31) and is maintained at a holding temperature in the range from 10° C. to 105° C. and is subjected to a holding pressure in the range from greater than 0.01 N / cm 2 to 10 N / cm 2, wherein the holding temperature and the holding pressure are maintained for a period of 0.5 minutes to 10 minutes.Heat exchanger, in particular a plate heat exchanger, a cooling plate arrangement for a vehicle battery for an electric vehicle, a heat exchanger for a photovoltaic application, a heat exchanger for an electronic cooling, a heat exchanger for an industrial cooling or a heat exchanger for domestic engineering, - with a base plate (2) and a prefabricated semi-finished product (5) which is in particular formed according to one of claims 1 to 3 and / or is produced according to one of claims 4 to 8, - wherein the base plate (2) and the semi-finished product (5) form or delimit between them a cooling channel through which fluid can flow, - wherein the base plate (2) and the plate (3) of the semi-finished product (5) are connected to one another by the adhesive layer (4) which consists of an adhesive, in particular a hot-melt adhesive, applied to the plate (3) of the semi-finished product (5) during the pre-production of the semi-finished product (5).Heat exchanger according to claim 10, characterised in that - the adhesive, in particular a hot melt adhesive, is a polyolefin-based adhesive.Heat exchanger according to claim 10 or 11, characterised in that - the base plate (2) is a channel plate formed in the manner of a channel by forming and the plate (3) of the semi-finished product (5) is a substantially planar cover plate.Heat exchanger according to one of Claims 10 to 12, characterized in that - a predefined number of base plates (2) and a predefined number of plates (3) are provided, wherein the base plates (2) and the plates (3) are stacked one on top of the other in alternating sequence, wherein adjacent plates (2, 3) are connected to one another by an adhesive layer (4) made of an adhesive, in particular a hotmelt adhesive, which is respectively pre-coated onto the plate (3).Vehicle, in particular an electric vehicle, having a heat exchanger according to one of Claims 10 to 13 or a heat exchanger produced according to Claim 9.

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