EP3537034B1 - Cooling plate for electronic components in vehicle lamps and method for producing the same - Google Patents

Description

The invention relates to a cooling plate for electronic components in vehicle lights according to the preamble of claim 1 and a method for its production according to the preamble of claim 8.

In particular, the invention is concerned with improving the cooling performance of cooling plates for electronic components in vehicle lights.

Electronic components such as diodes are widely used in vehicle lights. This is clearly the case, for example, in vehicle lights with semiconductor diodes, which are briefly referred to as semiconductor light sources and which emit light when current flows through, as light sources.

A vehicle lamp comprises, for example, a lamp interior substantially enclosed by a lamp housing and a lens and at least one lamp, optionally at least partially housed therein, comprising at least one light source, for at least one light function of the vehicle lamp.

Examples of vehicle lights are on the front of the vehicle, on the vehicle flanks and / or on the side mirrors as well as on the rear of the vehicle, exit lights, e.g. for ambient lighting, marker lights, brake lights, fog lights, reversing lights, and typically high-set third brake lights, so-called central, high-mounted Braking lights, daytime running lights, headlights and fog lights used as turning or cornering lights, as well as combinations thereof.

Such a combination is, for example, regularly implemented in the known rear lights. In these, for example, repeater lights, marker lights, brake lights, fog lights and reversing lights are used, to name just one of the many combinations implemented in rear lights. This list does not claim to be exhaustive, nor does it mean This means that all of the lights mentioned must be combined in a rear light. For example, only two or three of the named or other lights can be combined with one another in a common light housing of a rear light.

Each vehicle light fulfills one or more tasks or functions, depending on its configuration. A light function of the vehicle light is provided to fulfill each task or function. Light functions are, for example, a function that illuminates the lane when configured as a headlight, or when configured as a signal light, a signal function, such as a repeating flashing light function to indicate the direction of travel or a brake light function to indicate braking activity, or, for example, a position light function, such as a rear light function, to ensure a Visibility of the vehicle during the day and / or night, such as when configured as a rear light or daytime running light.

Each lighting function must fulfill a legally prescribed light distribution, for example. The light distribution defines at least to be observed, colloquially referred to as brightness, luminous fluxes in at least to be observed solid angle areas. The higher the brightness, the farther the light function or the greater the distance, briefly referred to as the visual range, from which it can be perceived.

For the individual light functions, in some cases different brightnesses or visibility ranges and in some cases different light colors are specified.

Due to their high efficiency in converting electrical current into light that is visible to the human eye, semiconductor light sources are increasingly being used as light sources for illuminants for vehicle lights, above all inorganic light-emitting diodes and, in a few vehicle models, organic light-emitting diodes.

Inorganic light-emitting diodes consist of at least one light-emitting diode semiconductor chip, or LED chip for short, as well as at least one primary optic which is molded on, for example by injection molding, and which completely or partially envelops the at least one LED chip. Vehicle lights are also known in which pure LED chips without molded primary optics are used.

In the following, for the sake of simplicity, a distinction is no longer made between inorganic light-emitting diodes and LED chips and instead the term LED is used uniformly to represent both, unless something else is explicitly mentioned.

An organic light-emitting diode, referred to for short as OLED (Organic Light Emitting Diode; OLED), is a luminous thin-film component made of organic semiconducting materials with at least one emitter layer enclosed between electrically conductive, for example metallic layers for the anode and cathode. The thickness or, in other words, the thickness of the layers is in the order of magnitude of about 100 nm. Depending on the structure, it is typically 100 nm to 500 nm.

The layers of an OLED are applied one after the other to a substrate which, together with an encapsulation applied to the top layer, protects the layers of the OLED against water, oxygen and other environmental influences such as scratch damage and / or pressure.

In contrast to inorganic light-emitting diodes, OLEDs do not require any single-crystal materials. In comparison to LEDs, OLEDs can therefore be manufactured using cost-effective thin-film technology. OLEDs thereby enable the production of flat light sources which, on the one hand, are very thin and, on the other hand, have a particularly homogeneous appearance when used as a luminous surface visible through the lens of a vehicle lamp.

For example, to implement a function of a vehicle light that goes beyond a light function, but also to operate both LEDs and OLEDs as light sources for a lamp in a vehicle light, one or more of one or more electronic components, more or less complex, or in short, electronic circuits designated electronic control circuits can be provided, which can be arranged, for example, on one or more illuminant carriers of a illuminant and housed in the interior of the luminaire.

A simple example of an electronic circuit relates to the equalization of different brightnesses of individual LEDs or of LED strings within a group of jointly operated ones on one or more illuminant carriers arranged LEDs. Such an electronic circuit consists of at least one or more series resistors as electronic components for adapting the forward voltage of the LEDs to the vehicle electrical system. For example, it is known to sort the LEDs in so-called binning according to forward voltage and intensity. In order to compensate for differences between several LED strings, which each consist of LEDs connected in series with the same forward voltage and intensity, and in order to obtain a homogeneous brightness distribution of the neighboring LED strings made of LEDs with different forward voltage and intensity, at least each LED strand is provided with one other series resistor.

LEDs and OLDEs also often require separate failure detection when used as a light source, especially in vehicle lights. This is due to the low power consumption of LEDs and OLEDs in general. For example, a control unit housed in a vehicle is not able to detect a change in the power drawn from the vehicle electrical system corresponding to the failure of one or a few LEDs or OLEDs, since a resulting electrical system voltage change is below the electrical system voltage fluctuations that occur during normal operation of a vehicle. An electronic circuit for failure detection that is accommodated in the vehicle light, for example, detects the failure of one or more light-emitting diodes in the vehicle light, e.g. using one or more comparators, and reports this to the control unit.

• zur Regelung und/oder Steuerung der Helligkeit bzw. Leuchtkraft der LEDs und/oder OLEDs, beispielsweise durch eine pulsweitenmodulierte Taktung der Stromversorgung für einen außerhalb des für das menschliche Auge wahrnehmbaren Bereichs gepulsten Betrieb,
• zur Kompensation oder Vermeidung elektromagnetischer Störungen, beispielsweise aufgebaut aus Kondensatoren und/oder Ferriten,
• zum Schutz der LEDs und/oder OLEDs z.B. vor einer Überspannung des Bordnetzes oder vor fehlerhafter Polung, beispielsweise umfassend eine oder mehrere Zenerdioden.

In addition, both LEDs and OLEDs may require additional electronic circuits. Examples of this are electronic circuits:

• for regulating and / or controlling the brightness or luminosity of the LEDs and / or OLEDs, for example by means of a pulse-width-modulated clocking of the power supply for pulsed operation outside the area that is perceptible to the human eye,
• to compensate or avoid electromagnetic interference, for example made up of capacitors and / or ferrites,
• to protect the LEDs and / or OLEDs, for example against overvoltage in the vehicle electrical system or against incorrect polarity, for example comprising one or more Zener diodes.

In summary, for almost all LED and / or OLED applications, a more or less extensive electronic circuit designed for the special LEDs and / or OLEDs, e.g. on the at least one light source carrier, must be applied. In the simplest case, the electronic circuit comprises a series resistor and a protective diode, but depending on the application, it can also contain significantly more electronic components, such as microcontrollers or controllers, comparators, transistors, protective diodes, electrical resistors, e.g. as series resistors, capacitors, ferrites, etc.

Thus, a light source with one or more LEDs and / or OLEDs as a light source usually comprises at least one further electronic component mentioned above in addition to one or more LEDs and / or OLEDs which themselves represent electronic components due to their diode structure. Accordingly, a light source with one or more LEDs and / or OLEDs as light sources can have at least one further electronic component in addition to the at least one LED and / or OLED.

The at least one light source of a light source and at least one further electronic component can be on a common light source carrier representing a conductor track carrier, or on spatially separated conductor track carriers, electrically connected to one another, for example by a cable harness or one or more parts of a cable harness, of which at least one forms the light source carrier, be arranged.

The conductor track carriers used in connection with a lamp carrier are conductor track carriers such as are also used for the electrical interconnection of electronic components, for example to control lamps other than LEDs and OLEDs.

Conductor track carriers can be designed to be rigid, for example, as so-called printed circuit boards, or as so-called flexible circuit boards, also referred to as conductor track flex foils, to be flexible, for example elastically or flexibly deformable. In addition, injection-molded circuit carriers produced using MID technology (MID technology: Molded Interconnect Device Technology) are known, which are manufactured in the form of a component, for example a vehicle lamp with integrated conductor tracks, using injection molding technology and, in addition to their function for making electrical contact, for example of electronic components and / or light sources simultaneously one Take over the mechanical function of the vehicle lamp, for example an arrangement of light sources along a given geometry with the simultaneous formation of a reflector.

The most widespread printed circuit supports are rigid circuit boards, known as printed circuit boards, printed circuit boards, or PCBs.

A printed circuit board is a carrier for electronic components. It is used for mechanical fastening and electrical connection. Almost every electronic device contains one or more printed circuit boards.

What all semiconductor light sources have in common is their rapid response with the start of a current flow in the forward direction, corresponding to their instantaneous light emission without delay, in contrast to, for example, conventional light sources such as incandescent lamps and gas discharge lamps, which are also used as light sources for lamps in vehicle lights, along with a higher light output compared to conventional light sources with the same energy requirement or reduced energy requirement with the same light emission.

In addition to their many advantages, however, semiconductor light sources, like the electronic components used in electronic circuits necessary for their operation, in particular based on semiconductor technology, have the disadvantage of aging that is accelerated with increasing temperature and can even be completely destroyed.

A significant cost factor of electronic circuits in vehicle lights, such as in rear lights, and / or in connection with electronic components in vehicle lights, is caused by the necessary cooling of the electronic components or at least some of the electronic components.

A cooling plate usually comprises a partial area that is thermally coupled to a heat source, for example to a printed circuit board fitted with electronic components that emit heat during its operation, or directly to one or more electronic components that emit heat during its operation. The coupling takes place, for example, with a thermally conductive adhesive. In addition, it includes another sub-area exclusively used for heat dissipation. The other part of the cooling plate therefore serves as a cooling surface over which the one Part of the absorbed heat is given off to the surrounding air. This arrangement leads to a directed flow of heat from the partial area of the cooling plate coupled to the heat source in the direction of the distal end of the cooling surface. In order to transport this heat flow, a high thermal conductivity in the direction of the heat flow is desirable. No high thermal conductivity is required across the heat flow or across the direction of heat transport.

Without further measures, a sheet does not have a preferred direction of its thermal conductivity.

Often, cooling plates made of a particularly metallic material with good heat conduction, such as aluminum, are used for passive cooling. The size of the surface of the cooling plates is essential for the cooling effect, because the heat transfer from the cooling plate to the air contained in the interior of the vehicle lamp has a thermal resistance that is much greater than the thermal resistance of the heat conduction in the cooling plate. The thermal conductivity of the cooling plates themselves is in some cases many times higher than is thermally necessary because the thickness of the cooling plates cannot be further reduced due to mechanical requirements, in particular on the flexural rigidity.

The cooling plates are usually punched from sheet metal and bent into a suitable shape. The punching and bending can take place in two process steps, but also as punch bending in one process step.

The size of the cooling plates is selected according to the thermal requirements. The shape of the cooling plates is mainly determined by the space requirements in the vehicle light; the size is selected so that there is sufficient surface for heat dissipation to the air contained in the interior of the vehicle light. As far as this is possible from the available space, the surface provided for heat dissipation into the air is placed vertically in the installation position of the vehicle light in order to reduce the thermal resistance of the heat transfer through convection caused by gravity, which is sometimes also referred to as free. In this way, the free convection supports the cooling in the best possible way. If the plate is lying horizontally, the cooling capacity is lower.

By DE 10 2012 012 853 A1 there is known a lamp with a lighting fixture with a plurality of LEDs as light sources. The LEDs are connected to cooling pegs to transfer heat, in particular to conduct heat. In a rear area facing away from the main light emission of the lighting fixture, the cooling pegs emit heat generated by the operation of the LEDs through heat transfer to the air in the surroundings of the lighting fixture within the lamp.

It is basically known to provide cooling plates with slots by removing parts of the cooling plate. This reduces the total area of the cooling plate, but the air circulation can be improved, accompanied by an increase in the cooling capacity (relationship between Reynolds and Nusselt numbers).

This is known from the prior art, for example, in the case of cooling plates on rotors of electrical machines comprising both generators and motors.

By DE 1 967 311 U It is known to produce cooling fins of an electrical converter from copper, these having transverse slots in order to prevent distortion of both the cooling fins themselves and of a vessel to which they are welded.

In static applications, in which an air flow occurs at most through gravitational convection, the surface available for heat dissipation is reduced as a result, accompanied by a deterioration in the heat transfer from the cooling plate to the surrounding air contained in the interior of a vehicle lamp.

By US 2011 005 725 A1 a heat sink with a heat sink connected to a plate-like, flat heat pipe is known. The heat pipe is filled with a medium which evaporates at the heat source and condenses at the heat sink. The return of the medium from the heat sink to the heat source for renewed evaporation takes place through capillary action. The heat pipe comprises a sealed housing, a capillary formed as a wick layer for returning the condensate and a support element arranged in the interior of the housing. The support member is formed by successively stamping high strength sheet metal from opposite sides thereof. The support element includes a plurality of support sections and a plurality of rectangular bodies connecting the support sections. Two adjacent support sections are connected to one another by a body arranged between them. In a transverse direction, the body and the support sections are arranged alternately. Each support portion includes a plurality of upwardly curved portions contacting the wick layer on the upper inside of the housing and a plurality of downwardly curved portions contacting the wick layer on the lower inside of the housing. In a longitudinal direction, the upwardly and downwardly curved parts are arranged in layers.

By CN 1404145 A a heat sink is known which comprises a cooling element made of cooling sheet metal arches which are curved alternately upwards and downwards in the transverse direction. The cooling sheet metal arches are connected in the longitudinal direction by connecting sections. In the longitudinal direction, each connecting section is followed by a cooling sheet metal arch, the cooling sheet metal arches arranged one after the other in the longitudinal direction interrupted by the connecting sections also being alternately curved up and down.

By CN 202056819 U a heat sink with right-angled cooling plates is known.

By US 2003 155 110A1 a heat sink with a cooling plate bent in a serpentine fashion is known. The longitudinal extension of the cooling plate, along which it is bent like a serpentine, runs orthogonally to the heat flow. In the cooling plate, air slots are arranged transversely to its longitudinal extent, in which slots are arranged guide grids rotated out of the area occupied by the cooling plate.

One object of the invention is to provide a cooling plate with improved heat dissipation to the surrounding air contained in the interior of a vehicle lamp, and to create a method for producing such a cooling plate.

The object is achieved in each case by the features of the independent claims. Advantageous embodiments are reproduced in the claims, the drawings and in the following description, including that associated with the drawings.

A first subject matter of the invention accordingly relates to a cooling plate with a first section provided for the thermal coupling of a heat source and at least one second section connected to the first section at least in a thermally conductive manner and provided for heat emission.

The first part comprises or forms a first partial area of the cooling plate, which is thermally coupled to the heat source for heat transfer from a heat source to the cooling plate, for example to a printed circuit board fitted with electronic components that emit heat during its operation, or directly to one or more during its operation heat-emitting electronic components.

The coupling takes place in particular by means of thermally conductive contact, for example by screwing and / or clamping, for example supported by a thermally conductive adhesive introduced between the heat source and at least the first part of the cooling plate.

The first part can transfer part of the heat directly coupled into it to the surroundings of the cooling plate.

The second part comprises or forms a second partial area of the cooling plate, which serves to dissipate at least the heat introduced into it by conduction from the first part to the surroundings of the cooling plate.

The second part thus serves to give off at least a substantial part of the heat introduced by a heat source into the first part of the cooling plate to the surroundings of the cooling plate.

Every second part comprises at least one distal end spaced from a boundary with the first part.

When heat is introduced into the first part, a directed heat transport is established in every second part from the boundary between the respective second part and the first part to the respective distal end of the corresponding second part.

Due to the heat transfer taking place from the second part to the environment, the heat flow within the second part decreases in the direction of heat transport.

The cooling plate is characterized in that the second part is divided at least in sections between its boundary to the first part and its distal end into a plurality of lamellar strips running away from the first part.

The strips run at least in sections between the boundary to the first part and the distal end in several planes, which are preferably parallel and offset from one another.

The strips are alternately bent up and down out of the plane of the sheet.

The strips are arranged rotated at least in sections between the boundary and the distal end about axes each running from the boundary to the distal end.

In this way, at least in sections, passage openings for the circulation of air are formed between the adjacent strips, through which spaces air can pass.

For example, the cooling plate can be characterized in that the strips are alternately offset, at least in sections between the boundary between the first part and the second part and the distal end of the second part, in two mutually spaced, parallel planes.

Adjacent strips run on different levels. A first strip runs in a first plane and a second strip, which is adjacent to the first strip, runs in a second plane. A third strip adjacent to the second strip again runs in the first plane, a fourth strip adjacent to the third strip again runs in the second plane, and so on.

The lamellar strips, which are alternately offset in opposite directions, thus span two parallel planes that are spaced apart from one another.

Due to the staggered arrangement in the two planes spaced apart from one another, passage openings for the circulation of air are formed between the adjacent strips at least in sections, through which air can pass.

As a result, the lamellar strips not only form an enlarged, open surface of the cooling plate, they also encompass a larger volume of air compared to a closed surface of an unslotted cooling plate that is not offset in two parallel planes, accompanied by an improved heat transfer to the surrounding air .

Without further measures, a sheet does not have a preferred direction of its thermal conductivity.

By dividing the second part of the cooling plate according to the invention into parallel strips that alternately run in two spaced planes, the second part has an improved thermal conductivity away from the first part, whereas the thermal conductivity within the second part is prevented across the lamellar strips .

For the cooling plate according to the invention, the partial area formed by the at least one second section, which is used to give off heat to the air, is slit and bent open at least in some areas in the direction of heat transport.

The first part is excluded from the slitting. It comprises one or more areas in which the cooling plate should remain closed, for example for thermal coupling to a heat source, such as an electronic component or another component, such as a circuit board, or to bend the cooling plate.

This means that the high thermal conductivity for the heat transport away from the first section provided for coupling heat from a heat source is not only maintained, but also improved by a larger volume coverage of the strips running in offset planes, accompanied by an improved heat transfer to the air surrounding the cooling plate. The side edges of the slotted areas increase the surface area for heat dissipation to the ambient air considerably. The cooling effect is improved by the larger surface. In addition to the increased surface, there are gaps in the cooling plate through which air can penetrate. Thus, a horizontally installed cooling plate according to the invention hinders the air convection less than a conventional, closed cooling plate. The advantage of the invention is therefore particularly great when the The space available in a vehicle light does not allow the cooling surfaces to be installed vertically.

In practical implementation, the direction of the slots in the cooling plate only has to correspond approximately to the direction of heat propagation in the closed cooling plate. Even with significant deviations, sufficient heat transport can still be ensured. In practice, therefore, regularly arranged slots that roughly follow the expected direction of heat transport are completely sufficient. The course of the slots can be carried out with sufficient accuracy through assessment. However, measurements or computer simulations of the heat flow in the solid sheet can also be used as a basis or as an aid for the design of the slot course.

In addition, the shape of the bends can be selected in such a way that they cause additional stiffening of the cooling plate. Thus, in addition to the length and width dimensions, the sheet metal thickness can possibly also be reduced compared to the prior art.

The bends are preferably shaped in such a way that no pointed corners or sharp edges arise, in order to keep the risk of injury during further handling when handling the cooling plate low.

The lamellar strips can lie in a common plane at the distal end of the second part which is spaced apart from the first part.

There the lamellar strips can be connected to one another transversely to their extension, for example by the second part being unslotted in the region of its distal end.

The lamellar strips can be bent back and forth between the two parallel planes. Adjacent strips can be curved in opposite waves.

In sections, the lamellar strips can be connected to one another for stiffening transversely to their extension. This can be achieved by dispensing with a separation between the strips in sections.

At the distal end, adjacent lamellar strips can lie in different of the two mutually offset parallel planes spanned by them.

A second subject matter of the invention relates to a method for producing a previously described cooling plate with improved heat transfer to surrounding air, in particular enclosed in a confined space, such as a luminaire interior.

The method provides that the second part of the cooling plate serving for heat dissipation at least the heat introduced into it by conduction from the first part to the surroundings of the cooling plate between its boundary to the first part and its distal end in several sections in the direction of the heat transport provided there to divide parallel, lamellar strips, preferably to cut and / or slit.

Furthermore, the method provides for the previously produced lamellar strips to be bent at least in sections between the boundary of the second part to the first part and the distal end of the second part, alternately offset in two mutually spaced, parallel planes, so that the offset arrangement in the two spaced-apart planes between the adjacent, previously directly adjoining strips, at least in sections, each create passage openings for the circulation of air, through which air can pass.

The strips are bent into several planes spaced apart from one another by alternately bending the adjacent strips out of an area occupied by the sheet metal into two planes spaced apart from one another.

The strips are arranged rotated at least in sections between the boundary and the distal end about axes each running from the boundary to the distal end.

According to this, the method provides, at least in sections in the area of the second part, solely by bending or the like, for the cooling plate to be widened to form a body that takes up a volume of space that is greater than the volume of the air it displaces.

The at least section-wise division of the second part into parallel, lamellar strips is preferably carried out free of material removal and / or material removal.

Alternatively, the second part is at least partially divided into parallel, lamellar strips with the least possible material removal, for example by laser cutting or precision sawing.

The strips are therefore preferably made by cutting or punching. A production method that does not remove material and / or does not remove material is advantageously used to produce the strips.

The sheet metal is preferably bent open in the same stamping process or stamping and bending process in which the contour of the cooling plate is stamped out. In the same process step, shearing creates slits that separate the bent lamellas or lamellar strips from one another. Thus, to implement the method according to the invention in a manufacturing process based on a production process for manufacturing a cooling plate according to the prior art, a modified punching tool can be provided which, at the same time as the cooling plate is punched out, separates the lamellar strips of the second section from one another in sections.

However, it is also possible to make the slots in the sheet metal in a separate, upstream process step. This is particularly useful if the sheet metal contour is also cut out, for example with laser cutting, in a first process step and the bending takes place in a second process step. In such a production process, additional cuts could be made in the sheet metal in the first process step and the lamellae thus created could be bent open in the second process step.

By slitting and bending the cooling plate, the surface of the cooling plate is increased significantly relative to its volume. At the same time, passage openings for air-forming spaces are created, which enable air convection through the space occupied by the second part of the cooling plate and thus additionally support the heat transfer from the cooling plate to the ambient air.

An embodiment is particularly advantageous in which the cross-section of the sheet metal available for heat conduction is not changed in the main direction of the heat flow.

With a suitable geometry of the bent-up areas, the cooling plate can also be stiffened, thereby achieving the desired mechanical Rigidity with a smaller sheet thickness than can be achieved according to the prior art.

Overall, a higher cooling effect can thereby be achieved and / or the use of material for the cooling plate and the weight of the cooling plate can be reduced.

It can be seen that the invention proposes to improve the cooling performance of a cooling plate to slit the cooling plate in sections without significant material removal, for example by punching, cutting, laser cutting, the lamellae thus produced running parallel to the heat propagation in the cooling plate, and the lamellae produced in this way alternating To offset directions against each other.

Additional advantages over the prior art that go beyond the complete solution of the task set and / or over the advantages mentioned above for the individual features are listed below.

Advantages over the prior art include, among other things, that the costs for cooling electronic components, including semiconductor light sources, are reduced with a cooling plate according to the invention in that less material is required for the production of the cooling plates. If the number of items is sufficiently high, this cost reduction exceeds the costs for the punching or punching and bending tool, which are higher than in the prior art.

By bending open the cooling plate in the punching process, the surface of the cooling plate is increased significantly relative to the volume. The enlargement of the surface compared to a cooling plate that has not been bent up depends on the dimensioning and geometry of the strips, also known as lamellas, that result from the bending. For example, surface enlargements in the range from 10% to 50% can be achieved. Typical values are around 30%. This enlarged surface has the effect that less sheet metal is required in order to achieve the same cooling effect as with a cooling sheet according to the prior art. This enables material, cost and weight savings. If additional rigidity is achieved by the bending up, the sheet thickness can also be reduced and thus additional material and weight can be saved.

At the same time, passage openings for the circulation of air are created, which allow air convection through the cooling plate, more precisely through the space occupied by the second part of the cooling plate, and thus additionally support the heat transfer from the cooling plate to the ambient air. This is especially true for cooling plates that are horizontal.

This property is particularly noticeable in vehicle lights in which the cooling plate can only be installed horizontally for reasons of space. This can also apply to vehicle lights in the trunk lid of a vehicle. These are rotated by approximately 90 ° when the trunk lid is opened, so that the convection inside the vehicle light changes. A cooling plate according to the state of the art can therefore come into a horizontal position under certain circumstances. The air can flow through a cooling plate according to the invention through the volume of space occupied by the second part of the cooling plate, so that the cooling is improved even with this unfavorable position of the vehicle light. There is also an improved cooling performance in a vertical position. In this case, the larger surface and the turbulence of an air flow around the air caused by the lamellae, which are arranged offset from one another with gaps in the two parallel planes, have a positive effect.

Additional advantages result from dispensing with the removal of material from the cooling plate. As a result, there is no risk of contamination from chips or the like in a vehicle lamp.

Furthermore, the thermal conductivity is neither reduced nor interrupted because the material boundaries created between the lamellae always run parallel to the direction of heat propagation.

Moving the lamellas in alternating directions creates a widening of the cooling plate, which means that it encompasses a larger volume of space and accordingly takes up more space. In particular, in environments with weak or no air flow, this space-consuming design means that the lamellae basically reach into cooler areas of the air, which improves the heat transfer.

Further advantages over the prior art include cost savings through material savings, in particular for cooling plates unfavorable installation position in the interior of the luminaire, in which a conventional cooling plate with a closed surface cuts the convection volume and / or the arrangement of a larger cooling plate is not possible due to lack of space.

An additional advantage with a far-reaching synergy effect is a weight saving due to the need for smaller cooling plates due to the improved heat transfer.

The cooling plate can have individual or a combination of the features described above and / or below in connection with the method, just as the method can have and / or implement single or a combination of several features described above and / or below in connection with the cooling plate.

The cooling plate and / or the method can alternatively or additionally be single or a combination of several introductory in connection with the prior art and / or in one or more of the documents mentioned for the prior art and / or in the following description of the in the drawings Have illustrated embodiments described features.

• Fig. 1 ein erstes nicht beanspruchtes Ausführungsbeispiel eines Kühlblechs in einer Draufsicht in Fig. 1 a) und in einer Seitenansicht in Fig. 1 b).
• Fig. 2 ein zweites nicht beanspruchtes Ausführungsbeispiel eines Kühlblechs in einer Draufsicht in Fig. 2 a) und in einer Seitenansicht in Fig. 2 b).
• Fig. 3 ein drittes nicht beanspruchtes Ausführungsbeispiel eines Kühlblechs in einer Draufsicht in Fig. 3 a) und in einer Seitenansicht in Fig. 3 b).
• Fig. 4 ein viertes Ausführungsbeispiel eines Kühlblechs in einer Draufsicht in Fig. 4 a) und in einer Seitenansicht in Fig. 4 b).
• Fig. 5 einen Schnitt durch das Kühlblech aus Fig. 4 entlang der Linie A - A in Fig. 4 a).
• Fig. 6 ein fünftes Ausführungsbeispiel eines Kühlblechs in einer Draufsicht.

The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. The proportions of the individual elements to one another in the figures do not always correspond to the real proportions, since some forms are simplified and other forms are shown enlarged in relation to other elements for better illustration. Identical reference symbols are used for identical or identically acting elements of the invention. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures which are necessary for the description of the respective figure. The illustrated embodiments merely represent examples of how the invention can be configured and do not represent a final limitation. They show in a schematic representation:

• Fig. 1 a first not claimed embodiment of a cooling plate in a plan view in Fig. 1 a) and in a side view in Fig. 1 b) .
• Fig. 2 a second not claimed embodiment of a cooling plate in a plan view in Fig. 2 a) and in a side view in Fig. 2 b) .
• Fig. 3 a third not claimed embodiment of a cooling plate in a plan view in Fig. 3 a) and in a side view in Fig. 3 b) .
• Fig. 4 a fourth embodiment of a cooling plate in a plan view in Fig. 4 a) and in a side view in Fig. 4 b) .
• Fig. 5 a section through the cooling plate Fig. 4 along the line A - A in Fig. 4 a) .
• Fig. 6 a fifth embodiment of a cooling plate in a plan view.

An in Fig. 1 , Fig. 2 , Fig. 3 , Fig. 4 , Fig. 5 , Fig. 6 The cooling plate 01 shown entirely or in parts comprises a first part 02 provided for the thermal coupling of a heat source and at least one adjoining the first part 02, adjoining it and at least thermally connected to the first part 02, provided for heat dissipation, up to a distant one , the distal end 05 of the cooling plate 01 reaching second part 03.

Every second part 03 thus comprises at least one distal end 05 spaced from a boundary 04 to the first part 02.

The first part 02 comprises or forms a first partial area of the cooling plate 01, which is thermally coupled to the heat source for heat transfer from a heat source to the cooling plate 01, for example to a printed circuit board fitted with electronic components that emit heat during its operation, or directly to one or more electronic components emit heat during their operation.

The coupling takes place in particular by means of thermally conductive contact, for example by screwing and / or clamping, for example supported by a thermally conductive adhesive introduced between the heat source and at least the first part of the cooling plate.

The first part 02 can transfer part of the heat directly coupled into it to the surroundings of the cooling plate 01.

The second part 03 comprises or forms a second sub-area of the cooling plate 01, which serves to dissipate at least the heat introduced into it by heat conduction from the first part 02 to the surroundings of the cooling plate 01.

The second part 03 thus serves to give off at least a substantial part of the heat introduced by a heat source into the first part 02 of the cooling plate 01 to the surroundings of the cooling plate 01.

The second part 03 comprises between their in Fig. 1 , Fig. 2 , Fig. 3 , Fig. 4 , Fig. 6 Boundary 04 to the first part 02 and its distal end 05, indicated by a dashed line in its approximate position and approximate course, several lamellar strips 06 running in the direction away from the first part 02 towards the distal end 05, at least in sections.

The strips run at least in sections between the boundary 04 to the first part and the distal end 05 in several planes, which are preferably parallel and offset from one another.

In this way, at least in sections, passage openings for the circulation of air-forming intermediate spaces 09 are formed between the adjacent strips 06, through which air can pass.

When heat is introduced into the first part 02, a directed heat transport from the boundary 04 between the respective second part 03 and the first part 02 to the respective distal end 05 of the corresponding second part 03 occurs in every second part 03.

As a result of the heat transfer taking place from the second part 03 to the environment, the heat flow within the second part 03 decreases in the direction of heat transport.

The strips 06 can alternate, for example, at least in sections between the boundary 04 between the first part and the second part 03 and the distal end 05 of the second part 03 or between the boundary 04 of the second part 03 and the first part and the distal end 05 of the cooling plate 01 be arranged offset in at least two mutually spaced, parallel planes 07, 08.

Fig. 1 shows an embodiment of a cooling plate 01 in a top view ( Fig. 1 a) and in a side view ( Fig. 1 b) . The sub-area of the cooling plate 01 encompassed by the second part 03, on which it is not thermally coupled, for example to an electronic circuit board, and on which the cooling plate 01 was not otherwise bent into shape, is divided into strips 06 by parallel slots, the extent of which extends along the Oriented towards the intended heat conduction. The slots are for example 2 mm to 10 mm apart. The strips 06 are correspondingly wide.

The strips 06 created by these adjacent slots, which can also be referred to as webs, are or are alternately bent up and down out of the plane of the sheet metal, as a result of which gaps 09 are created between them. With the in Fig. 1 cooling plate 01 shown the entire free length of the cooling surface.

Alternatively, several slotted areas can be provided one behind the other, for example to increase mechanical stability ( Fig. 2 ). Between the repetitions there are approximately 2 mm to 5 mm wide interruptions at which the cooling plate 01 thus has cross connections. The slots of the repetitions can be in direct extension of the previous slots.

However, an offset arrangement of the slots and thus the strips 06 is also possible. It promises additional flexural rigidity in the direction across the slots ( Fig. 3 ). With such a staggered arrangement, the interruptions between areas arranged one behind the other can be selected to be very short or even be omitted entirely. The repetitions need not be identical or periodic to the first slotted areas. It can be advantageous to vary the slot lengths, the slot spacing or the type of bend.

Adjacent strips 06 run at the in Fig. 1 , Fig. 2 , Fig. 3 shown embodiments cooling plates 01 in two different planes 06, 07. A first strip 06 runs in a first plane 07 and a second strip 06 adjacent to the first strip 06 in a second plane 08 running parallel to the first plane 07. A third, to the second strip 06 neighboring Stripe 06 again runs in the first plane 07, a fourth stripe 06 adjacent to the third stripe 06 again runs in the second plane 08 and so on.

The lamellar strips 06, which are arranged alternately offset in opposite directions, thus span two planes 07, 08 that are spaced apart from one another and run parallel.

The lamellar strips 06 form due to the staggered arrangement in the two spaced-apart planes 07, 08, whereby passage openings for the circulation of air are formed between the adjacent strips, at least in sections, through which air can pass, not just one Enlarged, open surface of the cooling plate 01, they also encompass a larger air volume compared to a closed surface of an unslotted cooling plate 01 not having strips 06 offset in several parallel planes, accompanied by an improved heat transfer to the surrounding air.

Thus, the high thermal conductivity for the heat transport away from the first part 02 provided for coupling heat from a heat source is not only still given, but even through a larger volume wrap around the strips 06 running in offset planes 07, 08, accompanied by an improved heat transfer to the cooling plate 01 surrounding air improved.

The side edges of the strips 06 additionally increase the surface area for heat dissipation to the ambient air. The cooling effect is improved by the larger surface. In addition to the increased surface, there are spaces 09 between adjacent strips 06, which form gaps in the cooling plate 01 through which air can penetrate. Thus, a horizontally installed cooling plate 01 according to the invention hinders the air convection less than a conventional, closed cooling plate. The advantage of the invention is therefore particularly great when the space available in a vehicle lamp prevents the cooling surfaces from being installed vertically.

In the case of the cooling plate 01, the partial area formed by the at least one second part 03, which is used to give off heat to the air, is slit and bent open at least in some areas in the direction of the heat transport.

The first part 02 remains excluded from the slitting. It comprises one or more areas in which the cooling plate 01 is to remain closed, for example for thermal coupling to a heat source, such as an electronic component or another component, such as a printed circuit board, or around to bend the heat sink 01.

By dividing the second part 03 of the cooling plate 01 according to the invention into parallel strips 06, which run alternately in two planes 07, 08 spaced apart from one another, the second part 03 has an improved thermal conductivity away from the first part 02.

In the practical implementation, the direction of the slots in the cooling plate 01 producing the strips 06 only has to correspond approximately to the direction of the heat propagation in the closed cooling plate. Even with significant deviations, sufficient heat transport can still be ensured. In practice, therefore, regularly arranged slots that roughly follow the expected direction of heat transport are completely sufficient. The course of the slots can be carried out with sufficient accuracy through assessment. However, measurements or computer simulations of the heat flow in the solid sheet can also be used as a basis or as an aid for the design of the slot course.

In addition, the shape of the bends can be selected in such a way that they cause additional stiffening of the cooling plate 01. Thus, in addition to the dimensions of length and width, the sheet metal thickness can possibly also be reduced compared to the prior art.

The bends are preferably shaped in such a way that no pointed corners or sharp edges arise in order to keep the risk of injury during further handling when handling the cooling plate 01 low.

For example, at least in sections between the boundary 04 between the first part and the second part 03 and the distal end 05 of the second part 03 or between the boundary 04 of the second part 03 to the first part and the distal end 05 of the cooling plate 01, alternating in at least two Strips 06 spaced apart from one another and running parallel to planes 07, 08 offset can lie at the distal end 05 in a common plane ( Fig. 1 , Fig. 2 , Fig. 3 , Fig. 6 ).

Here, the lamellar strips 06 lie in a common plane at the distal end 05 of the second part 03, which is spaced apart from the first part 02.

The lamellar strips 06 lying in a common plane at the distal end 05 of the second part 03, which is spaced apart from the first part 02, can be connected to one another at the distal end 05 transversely to their extension ( Fig. 1 , Fig. 2 , Fig. 3 , Fig. 4 , Fig. 6 ), for example in that the second part 03 is unslotted in the area of its distal end 05.

Alternatively, adjacent lamellar strips 06 at the distal end 05 can lie in different of the two mutually offset parallel planes 07, 08 spanned by them.

The lamellar strips 06 can be arranged, for example, curved in a wave-like manner between the, for example, two parallel planes 07, 08 running to and fro.

Adjacent strips 06 can be curved in opposite waves ( Fig. 2 , Fig. 3 ).

The lamellar strips 06 can, for example, be connected to one another in sections transversely to their extension in order to stiffen the cooling plate 01.

This can be achieved by dispensing with a separation between the strips 06 in sections ( Fig. 2 , Fig. 3 , Fig. 6 ).

Fig. 6 shows an embodiment with non-parallel slots. As a result, the strips 06 have a width that is variable at least in sections along their extension from the boundary 04 to the distal end 05.

The in Fig. 4 and Fig. 5 The cooling plate 01 shown, the strips 06 are arranged in a number of parallel, spaced-apart planes 10 corresponding to their number. In addition, the strips 06 are at least partially between the boundary 04 between the first part 02 and second part 03 and the distal end 05 of the second part 05 about axes running from the boundary 04 to the distal end 05 relative to the boundary 04 and the distal end 05 encompassing and rotated by the border 04 and the distal end 05 spanned surface.

The area spanned by the boundary 04 and the distal end 05 includes the axes running from the boundary 04 to the distal end 05, about which the strips 06 are rotated.

The strips 06 are rotated out of a plane spanned by the border 04 and the distal end 05 about their own axes running from the border 04 to the distal end 05.

Fig. 4 and Fig. 5 hereinafter show according to the invention that instead of the arched bending of the strips 06 forming the webs between the slots, the webs can also be rotated, whereby louvre-like slats are produced. This rotation can take place in the same direction for all slats, but also in different directions of rotation, for example rotated alternately to the right and to the left.

Fig. 5 shows the in Fig. 4 a) Section through the cooling plate 01 indicated by the dashed line A - A.

An above-described cooling plate 01 with improved heat transfer to surrounding air, in particular enclosed in a confined space such as a luminaire interior, can be produced by a method described below for producing a cooling plate 01 with a first section 02 and at least a second part 03 that adjoins the first part, adjoins it and is at least thermally conductively connected to the first part 02, intended for heat emission and reaching as far as a distal, distal end 05 of the cooling plate 01.

The method provides for the second part 03 of the cooling plate, which is used to dissipate at least the heat introduced into it by heat conduction from the first part 02 to the surroundings of the cooling plate 01, for example by means of parallel cuts or slits between its boundary 04 to the first part 02 and to divide the distal end 05 at least in sections into several lamellar strips running parallel in the direction of the heat transport provided there away from the first part 02 and towards the distal end 05, for example to cut them.

The strips 06 remain connected to the first part 02 in one piece. Cuts or slits are only made between the strips 06 in order to produce them in a previously closed sheet metal.

The method then provides for the previously produced lamellar strips 06, at least in sections between the boundary 04 of the second part 03 to the first part 02 and the distal end 05 of the second part 03, for example alternately offset in several spaced apart, for example parallel planes 07, 08 To bend 10.

As a result, the arrangement in the at least two spaced planes 07, 08, 10 between the adjacent strips 06, which were, for example, directly adjoining each other prior to bending, creates at least some sections of through openings for the circulation of air, through which air can pass.

The bending of the strips 06 into several planes 07, 08 spaced apart from one another can take place, for example, by alternately bending the adjacent strips 06 out of an area previously occupied by the sheet metal of the second section into two planes 07, 08 spaced from one another ( Fig. 1 , Fig. 2 , Fig. 3 , Fig. 6 ).

Alternatively or additionally, the strips 06 can be bent into several planes 10 spaced apart from one another by rotating the strips 06 around their own, for example parallel axes from the surface previously occupied by the sheet metal of the second section 03, running from the boundary 04 to the distal end 05.

According to this, at least in sections in the area of the second part 03, the cooling plate 01 is only widened by bending or the like to form a body that takes up a volume that is greater than the volume of the air displaced by the cooling plate 01.

The method preferably provides that the at least partial division of the second part 03 into parallel, lamellar strips 06 takes place free of material removal and / or material removal, preferably by cutting and / or punching and / or slitting.

Alternatively, the method provides that the second part 03 is at least partially divided into parallel, lamellar strips 06 with the least possible material removal and / or removal, preferably by laser cutting or precision sawing.

The strips 06 are therefore preferably produced by cutting or punching. A production method that does not remove material and / or does not remove material is advantageously used to produce the strips 06.

An advantageous embodiment of the method provides that the bending of the strips 06, for example their alternating bending up into two parallel, spaced-apart planes 07, 08, but also the twisting into a number of spaced-apart, for example parallel planes 10 corresponding to the number of strips 06 , takes place at the same time as the production of the strips 06 and / or the cutting out of the outer contour of the cooling plate 01 from a sheet metal blank, for example a semi-finished product.

For example, the cooling plate 01 is preferably bent open in the same stamping process or stamping and bending process in which the contour of the cooling plate 01 is stamped out. By shearing, slots can be produced in the same process step, which separate the bent-up lamellae or lamellar strips 06 from one another.

Thus, to implement the method according to the invention in a manufacturing process based on a production process for manufacturing a cooling plate according to the prior art, a modified punching tool can be provided which, at the same time as the cooling plate 01 is punched out, separates the lamellar strips 06 of the second part 03 from one another in sections.

However, it is also possible to make the slots in the sheet metal in a separate, upstream process step. This is particularly useful if the sheet metal contour is also cut out, for example with laser cutting, in a first process step and the bending takes place in a second process step. In such a production process, additional cuts could be made in the sheet metal in the first process step and the lamellae thus created could be bent open in the second process step.

By slitting and bending the cooling plate 01, the surface of the cooling plate 01 is considerably enlarged relative to its volume. At the same time, passage openings for air-forming spaces 09 are created, which enable air convection through the volume of space occupied by the second part 03 of the cooling plate 01 and thus additionally support the heat transfer from the cooling plate 01 to the ambient air.

The offset of the strips 06 in several planes 07, 08, 10, for example in alternating directions in two parallel planes 07, 08 forms a widening of the cooling plate 01, whereby it encompasses a larger volume of space and accordingly takes up more space. In particular in environments with a weak or no air flow at all, the strips 06 basically extend into cooler areas of the air as a result of this space-consuming design, whereby the heat transfer is improved.

An embodiment is particularly advantageous in which the cross-section of the sheet metal available for heat conduction is not changed in the main direction of the heat flow.

A stiffening of the cooling plate 01 can additionally be achieved by means of a suitable geometry of the bent-up areas, as a result of which the desired mechanical rigidity can be achieved with a smaller plate thickness than according to the prior art.

Overall, a higher cooling effect can thereby be achieved and / or the use of material for the cooling plate 01 and the weight of the cooling plate 01 can be reduced.

It can be seen that the invention proposes to improve the cooling performance of a cooling plate to slit the cooling plate in sections without significant material removal, for example by punching, cutting, laser cutting, the lamellas produced in this way running parallel to the heat propagation in the cooling plate, and the lamellas produced in this way To bend strips 06 in several planes, for example to offset alternating directions with respect to one another.

Advantages resulting from the invention include, among other things, that the costs for cooling electronic components, including semiconductor light sources, with a cooling plate 01 according to the invention are reduced in that less material is used for the Production of the cooling plates 01 is required. If the number of items is sufficiently high, this cost reduction exceeds the costs for the punching or punching and bending tool, which are higher than in the prior art.

By bending open the cooling plate 01 in the punching process, the surface of the cooling plate 01 is considerably enlarged relative to its volume. The enlargement of the surface compared to a cooling plate that has not been bent up depends on the dimensioning and geometry of the strips 06 that are produced by the bending and are also referred to as lamellas. For example, surface enlargements in the range from 10% to 50% can be achieved. Typical values are around 30%. This enlarged surface has the effect that less sheet metal is required in order to achieve the same cooling effect as with a cooling sheet according to the prior art. This enables material, cost and weight savings. If additional rigidity is achieved through the bending up, the sheet thickness can also be reduced, thus saving additional material and weight.

At the same time, passage openings are created for the circulation of air forming spaces 09, which allow air convection through the cooling plate 01, more precisely through the space occupied by the second part 03 of the cooling plate 01 and thus additionally support the heat transfer from the cooling plate 01 to the ambient air. This applies in particular to cooling plates 01 that are horizontal.

This property is particularly advantageous in vehicle lights in which the cooling plate 01 can only be installed horizontally for reasons of space. This can also apply to vehicle lights in the trunk lid of a vehicle. These are rotated by approximately 90 ° when the trunk lid is opened, so that the convection inside the vehicle light changes. A cooling plate according to the state of the art can thus under certain circumstances come into a horizontal position and hinder or even completely block the air circulation in the interior of the luminaire through its closed surface.

The air can flow through a cooling plate 01 according to the invention through the volume of space occupied by the second part 03 of the cooling plate 01, so that the cooling is improved even with this unfavorable position of the vehicle lamp.

There is also an improved cooling performance in a vertical position. In this case, the larger surface and the turbulence of an air flow around the air caused by the strips 06 or lamellas arranged offset from one another with gaps 09 from one another in several planes have a positive effect.

Additional advantages result from dispensing with the removal of material from the cooling plate 01. As a result, there is no risk of contamination from chips or the like in a vehicle lamp.

Furthermore, the thermal conductivity is neither reduced nor interrupted because the material boundaries produced between the strips 06 or always run parallel to the direction of heat propagation.

Further advantages over the prior art include cost savings through material savings, in particular for cooling plates with an unfavorable installation position in the interior of the luminaire, where a conventional cooling plate with a closed surface cuts up the convection volume and / or the arrangement of a larger cooling plate is not possible due to a lack of space.

An additional advantage with a far-reaching synergy effect is a weight saving due to the need for smaller cooling plates due to the improved heat transfer.

The cooling plate 01 and / or the method can alternatively or additionally be single or a combination of several introductory in connection with the prior art and / or in one or more of the documents mentioned for the prior art and / or in the above description both for the same, as well as features mentioned for the respective other subject matter of the invention and / or devices realizing features mentioned for the respective other subject matter of the invention and / or features realizing features mentioned for the respective other subject matter of the invention.

The cooling plate 01 can have individual features or a combination of the features described above in connection with the method, just like the method can have and / or implement individual features or a combination of several features previously described in connection with the cooling plate 01.

The invention is not restricted by the description based on the exemplary embodiments. Rather, the invention encompasses every new feature and every combination of features, which in particular includes every combination of features in the claims, even if this feature or this combination itself is not explicitly specified in the claims or exemplary embodiments.

The invention can be used commercially in particular in the field of the production of vehicle lights, especially vehicle lights.

The invention has been described with reference to preferred embodiments. However, it is conceivable for a person skilled in the art that modifications or changes can be made to the invention without departing from the scope of protection of the claims below.

List of reference symbols

01

Heat sink

02

first batch

03

second batch

04

border

05

distal end

06

Stripes

07

level

08

level

09

Space

10

level

Claims (11)

1. A cooling plate (01) having a first portion (02) and, adjoining thereto, at least one second portion (03) reaching up to a distal end (05), wherein:

   - the second portion (03) comprises, at least in sections between its border (04) to the first portion (02) and the distal end (05), a plurality of strips (06) extending in the direction away from the first portion (02) toward the distal end (05),

   - the strips (06) extend, at least in sections between the border (04) and the distal end (05), in a plurality of planes (07, 08, 10) offset in relation to one another,

   - spaces (09) are formed between the adjacent strips (06), and

   - the strips (06) are arranged, at least in sections between the border (04) and the distal end (05), so as to be twisted about axes extending in each case from the border (04) to the distal end (05),

   characterised in that the strips (06) are bent alternately upward and downward out of the plane of the plate.
2. The cooling plate according to claim 1, wherein the strips (06) are arranged, at least in sections between the border (04) and the distal end (05), so as to be offset alternately in two spaced apart, parallel extending planes (07, 08).
3. The cooling plate according to claim 2, wherein, at the distal end (05), the strips (06) lie in a common plane.
4. The cooling plate according to claim 3, wherein, at the distal end (05), the strips (06) are connected to each other transverse to their extension.
5. The cooling plate according to claim 2, wherein, at the distal end (05), adjacent strips (06) lie in different of the two parallel planes (07, 08) that are offset in relation to one another.
6. The cooling plate according to one of the claims 1 to 5, wherein the strips (06) are arranged so as to extend back and forth between the two parallel extending planes (07, 08).
7. The cooling plate according to one of the previous claims, wherein the strips (06) are in sections connected to each other transverse to their extension.
8. A method used to produce a cooling plate (01) having a first portion (02) and, adjoining thereto, at least one second portion (03) reaching up to a distal end (05), wherein the second portion (03) is first divided, at least in sections between its border (04) to the first portion (02) and the distal end (05), into a plurality of strips (06) extending in the direction away from the first portion (02) and toward the distal end (05), and subsequently, the strips (06) are bent, at least in sections between the border (04) and the distal end (05), into a plurality of spaced apart planes (07, 08, 10) such that, at least in sections, spaces (09) are created in each case between the adjacent strips (06) abutting on each other before the bending, and wherein the strips (06) are arranged, at least in sections between the border (04) and the distal end (05), so as to be twisted about axes extending in each case from the border (04) to the distal end (05), characterised in that the bending of the strips (06) into a plurality of spaced apart planes (07, 08) is carried out by the alternating bending of the adjacent strips (06) out of a planar surface, which is occupied by the plate, into two spaced apart planes (07, 08).
9. A method according to claim 8, wherein the division, at least in sections, of the second portion (03) is carried out without material stripping and/or material removal.
10. The method according to claim 8, wherein the division, at least in sections, of the second portion (03) is carried out with the least possible material stripping and/or material removal.
11. The method according to one of the claims 8 to 10, wherein the bending is carried out together with the production of the strips (06) and/or with the cutting of the cooling plate out of a sheet metal blank.

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