WO2012019918A1

WO2012019918A1 - Heat-conducting module and method for producing a heat exchanger

Info

Publication number: WO2012019918A1
Application number: PCT/EP2011/062964
Authority: WO
Inventors: Tobias Isermeyer; Holger Schroth; Uwe Weichelt; Martin Steinbach
Original assignee: Behr Gmbh & Co. Kg
Priority date: 2010-08-10
Filing date: 2011-07-28
Publication date: 2012-02-16
Also published as: DE102010039149A1

Abstract

The invention relates to a heat-conducting module (102) for controlling the temperature of at least one element (209), in particular an electrochemical energy store unit. The heat-conducting module (102) has a receiving surface for receiving the at least one element (209), a connecting surface for connecting the heat-conducting module (102) to a heat sink (104), and at least one detent hook (210). The detent hook (210) projects from the connecting surface and is shaped so as to engage in a detent opening in the heat sink (104) when the heat-conducting module (102) is moved relative to the heat sink (104) along a latching direction (215).

Description

Wärmeleitmodul and method for manufacturing

a heat exchanger

The present invention relates to a Wärmeleitmodul, a heat sink, a heat exchanger and a method for producing a heat exchanger, which is suitable for cooling an electrochemical energy storage unit.

DE 195 28 116 B4 describes the construction of Kühfplatten from laminated cores. By this approach, it is possible to realize channel structures in cooling plates without a machining, which allows a significant reduction in manufacturing costs. This technology can be further developed by embossing webs, so that the minimum number of channel plates can be reduced from two to one.

DE 43 14 808 C1 describes the construction of plate heat exchangers from trough-shaped identical parts, which can be stacked by 180 ° offset to a fluid fluid heat exchanger. The special feature lies here in the same part principle. DE 10 2007 009315 A1 describes the thermal connection of battery cells to a heat sink by means of material connection (potting of battery cells). The thermal coupling point focuses on the bottom area of the cell.

US 5,756,227 A describes a surface enlargement towards the front of a cooling plate.

If the "cell adaptation" function is required, for example with Batierie cells in contact with a heat sink, the cell adaptation is to be represented by another component, for example in the form of a cooling plate or a heat conductor bar in order to minimize the number of components, to improve the strength or the heat transfer resistance is optimized, the function of the cell adaptation is sometimes integrated into the function of the heat sink, ie the heat sink receives a contoured surface die casting as an economic manufacturing process of complex geometries segregates at low wall thicknesses or the use of refrigerant (HVAC system) for reasons of tightness ( Porosity), heat sinks are therefore constructed, for example, from sheets and tubes.

It is the object of the present invention to provide an improved Wärmeleitmodul, an improved heat sink, an improved heat exchanger and an improved method for producing a heat exchanger.

This object is achieved by a Wärmeleitmodul for controlling the temperature of at least one element, by a heat sink for a Wärmeleitmodul, by a heat exchanger and by a method for producing a heat exchanger according to the independent claims. The present invention is based on the finding that two elements of a heat exchanger can advantageously be connected together by means of a bayonet fitting or a locking mimic.

The inventive approach allows a cost-effective cooling plate for cooling, in particular electrochemical components such as Li-ion battery and EE components. A modular concept for separating the "tent adaptation" function from the "heat sink" function can be implemented. As a result, the choice of the optimal manufacturing method for both functions.

Apply the approach of the invention for connecting an arbitrarily complex cell adaptation geometry with a flow-through cooling plate. In this case, the representation of complex adaptation geometries can preferably take place via a casting. The representation of the cooling mat can be made of laminated cores and additionally or alternatively made of pipes in conventional construction.

The inventive use of a Verrastmimik having one or more locking hooks and optionally one or more locking bars and guides, a soldering, gluing, screwing or riveting of heat sink and cell adaptation can be omitted.

This results in an economic advantage. In addition, a very favorable die casting for more complex geometries of cell adaptation can be used. Due to the Verrastmimik it is not necessary that the Zeiladaption takes part in the thermal joining process, such as brazing, the cooling plates. In contrast to rivets and screws, no additional parts are required here. This also results in a lower susceptibility to corrosion. By means of a device according to the invention a simple and quick joining process is possible. There is no or at least no mechanically loaded adhesive bond required. Thus, there is no waiting time (eg pot life) after the joining process. The present invention provides a heat conduction module for tempering at least one element, in particular an electrochemical energy storage unit, having the following features: a receiving surface for receiving the at least one element; a connection surface for connecting the heat conduction module to a heat sink; and at least one latching hook, which projects from the connection surface and is shaped to engage in a latching opening of the heat sink, when the heat conduction module is moved relative to the heat sink along a Vertastrlchtung.

The heat-conducting module is preferably made of a good heat-conducting material, for example made of metal. For example, the Wärmeleitmodul be formed as a one-piece metal casting. Heat can be supplied to the at least one element via the heat conduction module or heat can be dissipated from the element. The element may be a battery, such as an electric or hybrid vehicle. A shape of the receiving surface may be adapted to the element, so that a good heat transfer between the element and the Aufnahmefiäche is made possible. For this purpose, the receiving surface may have indentations or elevations. The receiving surface can be designed so that it provides or supports a mechanical fixation of the element to the Wärmeleitmodul. The connection surface may be arranged opposite the receiving surface. In order to connect the heat-conducting module to the heat sink, the heat-conducting module can be moved starting from a mounting position along the latching direction into an end position. A geometry of the latching hook can be adapted to a geometry of the latching opening, so that the latching hook enters into a frictional connection with the latching opening, if the heat conduction module is in the end position. For this purpose, the latching opening may have an undercut, onto which a free section of the latching hook is pushed during the movement along the latching direction.

The Wärmeleitmodul may further comprise at least one locking bar. The locking bar may protrude from the connecting surface and be formed to enter a locking opening of the heat sink when the Wärmeleitmodul is moved relative to the heat sink along the Verreastrichtung. Further, the locking latch may be formed to prevent movement of the Wärmeleitmoduls relative to the heat sink against the Verreastrichtung when the Sperrrtegel has entered the locking opening. The locking bolt can thus enter the locking opening when the Wärmeleitmodul reaches the end position. An oppositely disposed with respect to the latching direction end portion of the locking bar may form a stop which bears against an edge region of the locking opening when the locking bar is located within the locking opening. The locking bar provides a reliable and cost effective method to prevent loosening of the Wärmeleitmoduls of the heat sink.

The heat-conducting module can also have at least one guide. The guide may protrude from and be shaped to define, in interaction with a guide opening of the heat sink, the latching direction upon movement of the heat conducting module relative to the heat sink when the guide has entered the guide opening. The guide can be designed as a bar. A longitudinal extension direction of the guide and the guide opening can be aligned along the latching direction. The interaction can be caused by side areas of the guide abutting or rubbing along edge areas of the guide opening. As a result, movements of the Wärmeleitmoduls, which differ from the Verreastrichtung be prevented. The present invention further provides a heat sink for a Wärmeleitmodul having at least one latching hook which protrudes from a connection surface of the Wärmeleitmoduls, comprising the following feature: a Wärmeleitplatte having at least one latching opening for receiving the at least one latching hook of the Wärmeleitmoduls, wherein the latching opening a Undercut to cause a latching of the latching hook in the latching opening when the Wärmeleitmodul is moved relative to the heat sink along a Verreastrichtung.

The heat sink may be suitable for guiding a fluid and have corresponding openings for supplying or removing the fluid and a corresponding fluid channel. The fluid may be a coolant or a refrigerant. The heat conduction plate may constitute a main surface of the heat sink. If the heat sink is made up of a plurality of laminations, the heat conduction plate can serve as a cover.

For example, the heat-conducting plate may have a layer structure of at least two metal sheets which at least partially overlap in the region of the latching opening in order to form the undercut. On this catfish the detent opening can be produced inexpensively.

The heat conducting plate may include at least one locking hole for receiving a locking bar which protrudes from the connecting surface of the heat conducting module. The locking opening may have an edge portion forming a stop for the locking bar to prevent movement of the Wärmeleltmoduls relative to the heat sink against the latching direction when the locking bar has entered the locking opening. Additionally or alternatively, the heat conducting plate may have at least one guide opening for receiving a guide which protrudes from the connecting surface of the Wärmeleitmoduls, wherein the guide opening has a shape which interacts with the guide, the Verreastrichtung upon movement of the Defined Wärmeleitmoduls relative to the heat sink, when the guide has entered the guide opening. The locking opening can prevent in combination with the locking bolt and located in the locking opening latching hook loosening the Wärmeleitmoduls of the heat conducting. The guide on the other hand facilitates the assembly.

The present invention further provides a heat exchanger comprising: a first heat conduction member having a connection surface for connecting the first heat conduction member to a second heat conduction member, the connection surface having at least one latching hook protruding from the connection surface; and the second heat conducting element with a Wärmeleitpiatte having at least one Raetöffnung for receiving the at least one latching hook of the first Wärmeleitelements, wherein the latching opening has an undercut to effect a latching of the latching hook in the latching opening when the Wärmeleitmodui relative to the heat sink along a Locking direction is moved.

The first heat-conducting element and the second heat-conducting element may be any elements of a heat exchanger which are held together by means of a locking mechanism.

For example, the first heat-conducting element may be a Wärmeleitmodui according to an embodiment of the invention and the second heat-conducting element may be a heat sink according to an embodiment of the invention.

The present invention further provides a method for producing a heat exchanger, comprising the following steps: Providing a Wärmeleitmoduls according to an embodiment of the invention;

Providing a heat sink according to an embodiment of the invention;

Aligning the Wärmeleitmoduls and the heat sink against each other, so that the at least one latching hook of the Wärmeleitmoduls is inserted into the at least one latching opening of the heat sink; and

Moving the Wärmeleitmoduls relative to the heat sink along a latching direction until the latching hook of the Wärmeleitmoduls is engaged in the latching opening of the heat sink.

By means of the method, the heat exchanger can be produced easily and inexpensively. By locking, a sufficiently high surface pressure can be achieved, which is required for heat transfer between the heat sink and the heat conduction module.

In an alternative embodiment, the Verrastmimik invention could also be formed directly on an electrochemical energy storage unit.

Advantageous embodiments of the present invention will be explained below with reference to the accompanying drawings. Show it:

Fig. 1 is an illustration of a heat exchanger, according to an embodiment of the present invention;

FIG. 2 is an illustration of a latching hook according to an embodiment of the present invention; FIG. Flg. 3 is an illustration of a locking bar according to an embodiment of the present invention;

4 shows an illustration of a guide strip, according to an exemplary embodiment of the present invention;

5 shows an illustration of a latching opening, according to an embodiment of the present invention; and

FIGS. 6 to 15 are further illustrations of a Wärmeiteitmoduls, according to embodiments of the present invention.

In the following description of the preferred embodiments of the present invention, the same or similar reference numerals will be used for the elements shown in the various drawings and similar, and a repeated description of these elements will be omitted.

1 shows an exploded perspective view of a heat exchanger 100 according to an embodiment of the present invention. The heat exchanger 100 has a Wärmeleitmodul 102, a cover plate 104, two channel plates 106 and another cover plate 106, which are arranged übereinandergestapeit. The heating module 102 has a base plate with a plurality of bars. The rods are spaced from each other at right angles to the base plate. In each case one cell of an electrochemical energy storage unit can be arranged between the rods. The sheets 104, 106, 108 form a heat sink through which a fluid can be passed.

The basic structure of the heat exchanger 100 shown in FIG. 1 is chosen only as an example. In particular, the heat conductivity module 102 and the heat sink 104, 106, 108 can also be designed differently. The heating module 102 represents a cell adaptation or another element of a heat exchanger and the heat sink is representative of a heat sink or a heat source. According to the exemplary embodiment shown, the cell adaptation is carried out in the form of the heat-insulating module 102 as a cast part, for example as a diecast part, and via a bayonet catch or latching mimic with the preferably soldered cooler, here in the form of a laminated plate cooler 104, 106, 108.

FIG. 2 shows a detail of a heat exchanger, according to an embodiment of the present invention. Shown is a portion of a heat-insulating module 102 and a heat sink 104, which may be a soldered radiator. The Wärmeleitmodul 102 has a base plate which rests on a surface of the heat sink 104. On a side facing away from the heat sink 104, a body 209 to be cooled, for example a battery cell, may be arranged on the heat conduction module 102. An attachment of the body

209 on a receiving surface of the Wärmeleitmoduls 102 may be made in any suitable manner. The heating module 102 is fastened to the heat sink 104 by means of a latching hook 210. The latching hook 210 is part of the Wärmeleitmoduls 102 and has two orthogonal or substantially rectangular connected sections. A first portion of the latching hook 210 extends substantially orthogonal to the base plate of the heat-melody module 102, and a second portion extends substantially parallel to the base plate. The heat sink 104 has a latching opening into which the latching hook 210 is inserted. The latching opening has an opening cross-section to the surface of the heat sink 104, which makes it possible to introduce the latching hook 210 orthogonal to the surface in the latching opening. Spaced to the surface, the detent opening has a shoulder which forms an undercut. The undercut is formed on the side of the detent opening to which the free end of the second portion of the latching hook 210 points. Belm mounting is the Wärmeieitmodul 102 after the latch hook

210 has been inserted into the latching opening, moved in a latching direction 215. The latching direction 215 here corresponds to the direction in which the latching hook 210 shows. By moving into the latching direction 215, the free end of the second section is inserted into a free space formed by the undercut. Oabei the latching hook 210 comes into direct contact with an overhanging portion of the undercut, so that the latching hook 210 is fixed when it is in an end position.

According to this exemplary embodiment, the heat-conducting module 102 has a plurality of latching hooks 210. The latching hooks 210 on the Wärmeleitmodul 202 are arranged and configured such that a sufficiently high surface pressure with minimal thermal resistance can be represented. Alternatively, the latching hooks 210 could also be arranged on the cooling plate 104, in which case corresponding latching openings would be provided in the heat-conducting module 102.

The latch hooks 210 are chamfered to ensure a continuous increase in force until the end of the joining process. The latching hooks 210 are dimensioned so that the deformations occurring during joining are linear and elastic.

FIG. 3 shows a further detail of a heat exchanger, according to an exemplary embodiment of the present invention. Shown is a part of a Wärmeleitmoduls 102 and a heat sink 104. The Wärmeieitmodul 102 has on a side facing the heat sink 104 a locking bar 320. The locking bar 320 is in the form of a ramp which is oriented along the latching direction 215 so that the flat end points in the direction of the latching direction 215 and the edge is aligned counter to the latching direction. The heat sink 104 has a first radiator opening 322 and a second radiator opening 324, which are arranged at a distance from each other. At the beginning of assembly, the locking bar 320 is inserted into the first radiator opening 322. Subsequently, the heat conductivity module 102 is moved along the latching direction 215, whereby the heat conductivity module 102 in the region of the locking bar 320 is lifted slightly, while the locking bar 320 is turned off the first radiator opening 322 out and over the web between the first radiator opening 322 and the second radiator opening 324 moves. As soon as the edge of the locking bar 320 is above the second radiator opening 324, the locking bar 320 moves into the second radiator opening 324 and the heat-conducting duct 102 is thus returned to the heat sink 104. In an end position, the heat conduction module 102 rests on the heat sink 104 and the edge of the locking bar 320 abuts against a rear wall of the second radiator opening 324 with respect to the latching direction 215. The locking bar 320 prevents movement of the Wärmeleitmoduls 102 against the latching direction 215th

The locking bar 320 can be used in combination with the latching hook shown in Fig. 3. In this case, the or a plurality of locking bolts 320 are part of the Verrastmimik to announce an accidental opening of the compound. In the case of the locking bolts 320, these are ramps which, at some point in the joining process, enter into an undercut and prevent a rearward opening of the connection.

4 shows a further detail of a heat-insulating module 102, according to an exemplary embodiment of the present invention. The heat-conducting module 102 has a guide 430 on a side facing the heat sink 104 in addition to latching hooks 210. The guide 430 has the shape of a guide bar, which is arranged on the Wärmeleitmodul 102 and protrudes from a surface of the Wärmeleitmoduls 102. A longitudinal extension direction of the guide 430 is aligned along the latching direction 215. Instead of a continuous guide strip and at least two spaced-apart and aligned in the latching direction 215 guide elements can be provided. In the heat sink 104, a corresponding opening is provided into which the guide 430 is inserted at the beginning of the assembly and which is oriented and shaped to guide the heat conduction module 102 along the latching direction 215. During assembly, the locking hooks 210 are themselves inserted through openings on the radiator, which have sufficient excess to absorb manufacturing tolerances. In order nevertheless to achieve a laterally defined guidance of the two joining partners, the more closely tolerated guide strip 430 is part of the Verrastmimik.

5 shows a further detail of a heat exchanger, according to an exemplary embodiment of the present invention. Shown is a part of a Wärmeleitmoduls 102 with a latching hook 210 which is engaged in a heat sink 104. The cooler 104 is constructed according to this embodiment in laminated sheet construction. In this embodiment of the cooler 104 in laminated sheet construction of the stratification can be used to represent the necessary for the representation undercuts. The shown portion of the laminated heat sink 104 may be constructed of two superimposed sheets, wherein an undercut portion 513 is located in a transition region between the two sheets. In this way, the latching opening, in which the latching hook 210 is latched, be formed by the fact that in each case a through opening is provided in the two sheets. In this case, the passage opening of the lower plate in the direction of the latching direction has a larger dimension than the passage opening of the upper sheet.

6 shows a further detail of a heat-conducting module 102, according to an exemplary embodiment of the present invention. The heat-conducting module 102 has, on a side facing the heat sink, a guide 430 in addition to a latching hook 210. The latching hook 210 projects further than the guide 430 out of the heating unit. On a side facing away from the heat sink, a body 209 to be cooled is connected to the heat conductivity module 102.

FIG. 7 shows a heating module 102 according to an exemplary embodiment of the present invention. The Wärmeieitmodul 102 has on a heat sink side facing six latching hooks 210, a locking bar 320 and a guide 430. Three of the latching hooks 210 are in a row arranged opposite edge portions of the Wärmeleitmoduls 102. The locking bar 320 and the guide 430 are arranged approximately centrally between the two rows of latching hooks 210. On the Wärmeleitmodul 209 three rectangular cells 209 are arranged. The latching hooks 210, the locking bolt 320 and the guide 430 form a Verrastmimik that allow a fixation of the Wärmeleitmoduls 209 on a suitably shaped heat sink.

FIG. 6 shows an enlarged view of a section of the heat-conducting module 102 shown in FIG. 7.

FIG. 9 shows a further view of the heat-conducting module 102 shown in FIG. 7.

10 shows a further detail of a heat-conducting module 102, according to an embodiment of the present invention. Shown is a section of the Wärmeleitmoduls 102 with a latching hook 210th

Fig. 1 1 shows a view of a latching hook 210, according to an embodiment of the present invention.

FIG. 12 shows a section of a heat exchanger, according to an embodiment of the present invention. Shown is a part of a Wärmeleit- module 102 with a latching hook 210 and part of a heat sink 104. The heat sink 104 has a latching opening, in which the latching hook 210 is engaged. The detent opening has a recess in a wall region, which is formed by an undercut. The latching hook 210 is chamfered in its hook-shaped section. In this way, the latching hook 210 can be inserted as far into the recess until it abuts against a wall surface of the recess shown in FIG. 12 above. In the position shown in FIG. 12, the latching hook 210 can neither be moved further in the latching direction nor upwards, out of the latching opening. FIG. 13 shows an outer section of a heat exchanger according to an embodiment of the present invention. FIG. Shown are a part of a Wärmeleitmoduls 102 with a locking bar 320 and a portion of a heat sink 104. The Wärmeleitmodul 102 rests on a surface of the heat sink 104 on. The locking bar 320 projects into a radiator opening of the heat sink 104 and, as a stop against a wall of the radiator opening, prevents movement of the heat-conducting module counter to the latching direction.

FIG. 14 shows an enlarged view of a section of the heat-conducting module 102 shown in FIG. 13.

Fig. 15 shows a heat exchanger 100, according to an embodiment of the present invention. Shown is a heat sink 104, to which a Wärmeleitmodul 102, the three cells 209 carries, is placed. The Wärmeleitmodul 102 is fixed by means of a Verrastmimik to the heat sink 104. The heat sink 104 has corresponding openings to which the Verrastmimik can intervene.

The described Ausführungsbeispieie the heat exchanger for contact cooling of solids with the aid of a heat conducting element are chosen only by way of example and can be combined.

Instead of stacked sheets, a cooling plate can also be constructed from parallel juxtaposed flat tubes. In addition, numerous other designs are conceivable. In general, the approach according to the invention is not limited to a cooling plate but can be used in general for a connection of two functional elements, for example a cell adaptation and a heat sink.

The heat conduction module can be used for receiving prismatic hard-case cells, that is to say a cell in a cuboidal aluminum container, in which a heat-conducting element is already represented via the cell outer body. is provided that the wall thickness of the cell cup sufficiently thick and the Kontaktierungsgeometrie is sufficiently flat. In addition, the heat conduction module can be a cell adaptation for frontal cell cooling of pouch cells ("cells in vacuum tubes") or circular cells (cylindrical hardcase) .To support the heat conduction to the cooling plate can be used in pouch cells bends that are glued or compressed between the cell stacks and Due to the cylindrical geometry, the adaptation of round cells to a cooler or a supporting structure is associated with difficulties because of the cylindrical geometry In the interstices between the cells thermally conductive rods or the like are introduced.

Claims

Patent claims

1. Wärmeleitmodul (102) for tempering at least one element (209), in particular an electrochemical energy storage unit, with the following features: a receiving surface for receiving the at least one element; a bonding surface for connecting the heat conduction module (102) to a heat sink (104); and at least one latch hook (210) protruding from the connection surface and formed to lock in a latching hole of the heat sink when the heat conduction module is moved relative to the heat sink along a latching direction (215).

The thermal conduction module (102) of claim 1 including at least one locking bar (320) protruding from the interface surface and shaped to enter a barrier opening of the heat sink (104) when the heat conduction module (102) moves relative to the heat sink along the heat sink Locking direction (215) is moved, and to prevent movement of the Wörme- control module relative to the heat sink against the latching direction when the locking bar has entered the locking opening.

A heat-insulating module (102) according to any one of the preceding claims, comprising at least one guide (430) protruding from and formed from the connection surface to interact with a guide opening of the heat sink (104), the latching direction (215) upon movement of the heat-conducting module (102) to specify relative to the heat sink, when the guide has entered the guide opening.

4. Wärmeleitmodul (102) according to one of the preceding claims, which is formed as a one-piece metal casting.

5. heat sink (104) for a Wärmeleitmodul (102), which has at least one latching hook (210) which protrudes from a Ve ig ngsfläche the heat conduction module, with the following feature of a heat conduction plate, the at least one detent opening for receiving the at least one Latching hook (210) of the Wärmeleitmoduls (102), wherein the latching opening has an undercut (513) to effect a latching of the latching hook in the latching opening when the Wärmeleitmodul is moved relative to the heat sink (104) along Verrastrlchtung (215) ,

6. heat sink (104) according to claim 5, wherein the heat meltsplate has a layer structure of at least two sheets which overlap at least partially in the region of the latching opening to form the undercut (513).

7. The heat sink (104) according to claim 5 or 6, wherein the heat conduction plate has at least one barrier opening for receiving a Sperrriegeis (320) protruding from the connecting surface of the Wärmeleitmoduls, wherein the locking opening has an edge region which forms a stop for the locking bar to prevent movement of the heat conducting module (102) relative to the heat sink (104) against the latching direction (215) when the latch has entered the latch opening and / or wherein the heat sheet has at least one guide opening for receiving a guide (430). protruding from the connecting surface of the Wärmeleitmoduls, wherein the guide opening has a shape which interacts with the guide, the Verreastrichtung at a Specifies movement of the Wärmeleitmoduls relative to the heat sink when the guide has entered the guide opening.

8. A heat exchanger (100), comprising: a first heat conduction member (102, 104) having a connection surface for connecting the first heat conduction member to a second heat conduction member, the connection surface having at least one latch hook (210) protruding from the connection surface; and the second heat-conducting element (102, 104) having a heat-conducting plate which has at least one latching opening for receiving the at least one latching hook of the first heat-conducting element, wherein the latching opening has an undercut (513) to effect latching of the latching hook into the latching opening, if the heat conduction module is moved relative to the heat sink along a latching direction (215).

9. Heat exchanger (100) according to claim 8, wherein the first heat-conducting element is a heat-conducting module (102) according to one of claims 1 to 4 and the second heat-conducting element is a heat sink (104) according to one of claims 5 to 7.

10. A method of making a heat exchanger (100) comprising the steps of:

Providing a Wärmeleitmoduls (102) according to any one of claims 1 to 4;

Providing a heat sink (104) according to one of claims 5 to 7; Aligning the Wärmeleitmoduls and the heat sink against each other, so that the at least one latching hook (210) of the Wärmeleitmoduls is inserted into the at least one latching opening of the heat sink; and

Moving the Wärmeleitmoduls relative to the heat sink along the latching direction (215) until the latching hook of the Wärmeleitmoduls is engaged in the latching opening of the heat sink.