LIQUID-COOLED BRAKE RESISTOR IN PLATE HEAT EXCHANGER DESIGN

Description

[0001] The present invention relates to a system for transferring thermal energy to a liquid medium. This system is used, for example, as a liquid-cooled braking resistor.

[0002] In the area of ​​drive technology, excess braking energy can be converted in braking resistors - kinetic energy is converted into electrical energy, for example by a generator brake such as the drive motor in recuperation mode, and this energy is converted into a cooled braking resistor if it cannot be used for any other purpose - the resistor acts as a consumer, converting the electrical energy into thermal energy, which must then be dissipated accordingly to avoid local overheating of the braking resistor.

[0003] Such a braking resistor must have an appropriate dielectric strength, sufficiently high pressure stability (if the medium flowing through has a higher pressure) and be able to withstand a power load in order to be suitable for use.

[0004] Braking resistors are used, for example, in e-trucks (trucks with electric motors) and e-buses, but braking resistors can also be used in rail vehicles and other drive concepts, especially in drive concepts where space is limited and noise emission limits are limited.

[0005] They are used to convert excess electrical energy when it cannot be stored otherwise - for example, when a battery that supplies power to the electric motor is fully charged, but the vehicle still needs to be braked using a generator brake.

[0006] Many air-cooled braking resistors are known from the state of the art. However, these require a corresponding ventilation system for cooling and therefore a correspondingly large installation space.

[0007] Various designs of liquid-cooled braking resistors are also known in the prior art. For example, an active element, i.e., the actual electrical resistor, can be embedded in an aluminum housing or tubular heater. The cooling medium then has no direct contact with the resistor but is guided through corresponding holes in the aluminum housing, where it absorbs heat and thereby cools the resistor. Tubular heaters can also be installed in a closed container, which is cooled accordingly.

[0008] Furthermore, liquid-cooled braking resistors in modular designs are possible, and the actual resistor, i.e., the active element, can be embedded in a flow channel within a housing. The electrical insulation between the coolant and the active element can be achieved, for example, by a silicone sheath.

[0009] In the design in which the active element is insulated within a tubular heater, the tubular heater is insulated and constructed to be liquid-tight. The coolant can then flow around the tubular heater and dissipate heat accordingly.

[0010] Document EP 2 592 633 A1 discloses a liquid-cooled braking resistor comprising a block, a liquid inlet, a liquid outlet, and a cavity. The cavity has an open side closed by a thermally conductive but electrically insulating flat layer. This flat layer supports a flat resistor, the main planes of which are aligned parallel to each other. The cavity is provided with a liquid flow path between the liquid inlet and the liquid outlet, and elastically pressing means are housed within the cavity, which are designed to press the flat layer against the resistor. The elastic means comprise a plurality of springs arranged in the internal liquid flow path of the block.

[0011] The coolant is guided in a meandering pattern along the insulated active element to ensure sufficient heat absorption. However, such a flow pattern causes a high pressure drop, which is further amplified by the elastic elements. A similar resistance is disclosed in document EP 0585 611 A2.

[0012] It is therefore an object of the invention to provide a liquid-cooled system for heat energy transfer that has minimal space requirements and is scalable. Nevertheless, a large heat transfer area, low internal pressure drop, high dielectric strength, and improved heat transfer efficiency are to be realized.

[0013] This object is achieved by a shaped sheet according to claim 1 and a coolable resistor according to claim 4. Further preferred embodiments of the present invention are the subject of the subclaims.

[0014] A shaped sheet according to the invention has the following features: a first side coated with an electrically insulating layer, with an electrically conductive device applied to or embedded in the electrically insulating layer, and a second side. This side serves as the coolant flow.

[0015] An inlet opening and an outlet opening are provided in the molded sheet.

[0016] A first bead is provided on the edge of the first side of the shaped sheet, which is preferably open on at least one side.

[0017] Furthermore, third beads are provided on the first side, each surrounding the inlet opening and the outlet opening. All beads have the same height profile and are planar to each other.

[0018] Beads are groove-shaped depressions or embossments which, in this case, serve to tightly connect two shaped sheets.

[0019] The electrically insulating layer, which is applied between the molded sheet and the electrically conductive device, ensures that no electrical current flows into the metallic molded sheet. At the same time, the electrically insulating layer exhibits very good thermal conductivity, so that the heat flow generated by the electrically conductive device can be effectively transferred to the molded sheet and, from its other side, convectively to the coolant. The electrically insulating layer is preferably made of ceramic, sintered ceramic paste, or a ceramic composite material and can be applied by thermal spraying of ceramic, sintering of ceramic pastes, or similar insulating materials. The materials used are designed in such a way that thermal stresses do not lead to cracking.

[0020] The layer thickness is applied according to the insulation requirements and has a very low thermal resistance, which can be achieved in particular by ceramic composite materials.

[0021] The thickness of the electrically insulating layer is preferably 50-500 µm. The thermal conductivity of the material of the electrically conductive layer is preferably between 0.5 and 2 W / mK, more preferably 1 W / mK.

[0022] The electrically conductive device preferably comprises a conductor applied by the screen printing process.

[0023] The shaped sheet, constructed as a plate with a stamped contour, combines the heat source (electrically conductive device) on one side and the heat sink (coolant flow) on the other. The compact design enables a large heat transfer surface with a short thermal conduction distance, ensuring optimal heat dissipation to the coolant and thus increasing heat transfer efficiency.

[0024] The shaped sheet is preferably rectangular and therefore easy to manufacture.

[0025] Preferably, the first bead protrudes from the first side of the formed sheet, more preferably obliquely (i.e., it forms an acute angle with the normal vector of the first side of the formed sheet). This facilitates connection to other formed sheets that have the same structure – if the first sides of two formed sheets are opposite each other, two first beads are also opposite each other and can thus be easily connected to each other. Furthermore, this creates a sufficiently large cavity between two first sides of two formed sheets, providing enough space and distance for two electrically conductive devices – one on the first side of each formed sheet.

[0026] Preferably, a second bead is provided on the edge of the second side of the shaped sheet, which serves for the flow of coolant, and further preferably surrounds the shaped sheet. This bead serves for connection to a second side of another shaped sheet.

[0027] Further preferably, at least one fourth bead is provided, which divides the second side of the shaped sheet, thus enabling a U-shaped flow path. If the second sides of two shaped sheets are opposite each other and both fourth beads are connected to each other, the fourth beads can be used to define the longest possible flow path for the coolant.

[0028] The formed sheet is preferably made of stainless steel. This material is corrosion-resistant, has good thermal conductivity, and is easy to process.

[0029] Preferably, at least two contact surfaces are provided on the first side of the shaped sheet, each of which is electrically connected to one end of the electrically conductive device. A connection element can be connected to each of these contact surfaces.

[0030] Further preferably, a clearance (a type of recess or depression) is provided on one edge of the first side of the shaped sheet, which borders the at least two contact surfaces. This clearance is configured to provide sufficient space for the provision of connection elements (for electrical connections) or other connecting elements.

[0031] A coolable electrical resistor according to the invention comprises at least two shaped sheets according to the invention – this is, so to speak, the smallest unit of a coolable resistor. The combination of exactly two shaped sheets to form a coolable electrical resistor is also referred to below as a shaped sheet pair.

[0032] The respective first sides of two shaped sheets are arranged opposite each other. In the case of a rectangular shape of both shaped sheets, the respective first beads (which are then preferably arranged on three circumferential sides of the shaped sheets) and third beads are connected to each other.

[0033] The connection of the first beads creates a cavity between the first two sides of the two molded sheets, and both molded sheets are firmly and tightly connected to each other on at least three sides at the edge (if the molded sheets are rectangular). Furthermore, the third beads, which surround the inlet and outlet openings of the molded sheets, are also connected to each other. This means that there is no cavity in the area of ​​the inlet and outlet openings, but rather a common inlet and outlet opening, through which no liquid can penetrate into the cavity.

[0034] Furthermore, the cavity, i.e., the cavity between the respective first sides of two molded sheets, is preferably at least partially filled with a filler, wherein the filler even more preferably contains silicone. Filling the cavity with a filler, primarily silicone, serves to ensure pressure stability and homogeneous temperature distribution.

[0035] This means that even a side where there is no first bead on the shaped sheets can be sealed.

[0036] Preferably, the respective second sides of two shaped sheets are arranged opposite one another, and both shaped sheets are connected to one another by the respective second beads. This also creates a cavity between the respective second sides of two shaped sheets, with the edges sealed by the connection of the respective second beads. The cavity between the respective second sides of two shaped sheets serves for the flow of coolant.

[0037] Further preferably, the fourth beads are also connected to one another, thus defining a flow path between the respective second sides of the two shaped sheets, which flow path is adapted to allow a coolant to flow from the inlet opening to the outlet opening. A U-shaped flow path is generally preferred and, in the preferred embodiment described here, also necessary to avoid a direct connection between the inlet and outlet openings.

[0038] However, the position of the inlet and outlet openings can basically be chosen arbitrarily.

[0039] The fourth bead 6 serves only to guide the flow in the case of adjacent inlet and outlet openings 13, 12. In the case of opposite openings, the fourth bead 6 would not be necessary or would at most contribute to the homogenization of the flow.

[0040] A pair of shaped sheets of a coolable resistor according to the invention thus comprises two shaped sheets, an insulation layer, and an electrically conductive device per shaped sheet, which is located between two shaped sheets, as well as two electrical connection elements that electrically connect the electrically conductive devices in parallel. The two shaped sheets, preferably of identical design, are combined with one another in such a way that the first sides, i.e., the resistor sides, are aligned with one another and form a cavity.

[0041] For applications with higher insulation requirements, the electrical conductor can also be introduced as a meandering, thin, metallic plate, which is inserted into the cavity of the formed sheet pair through an insulating encapsulation, primarily with silicone.

[0042] The outer sides of the pair of molded sheets, i.e., the respective second sides of the molded sheets, represent the heat sink and are designed so that an additional cavity is created when at least two pairs of molded sheets are aligned. The cavity is constructed so that the coolant flows past the second sides of the molded sheets at high flow velocity, creating a high degree of turbulence that ensures heat transfer to the coolant.

[0043] The construction of pairs of shaped sheets, which have electrically conductive devices in the inner cavity and around which coolant flows on the second sides of the pair of shaped sheets (i.e. on both sides), ensures a large heat exchanger surface with high pressure stability at the same time.

[0044] It is precisely the small distance between the second sides of two shaped plates (or between a shaped plate and an edge of a flow space) that leads to sufficiently high flow velocities, which ensure a sufficiently high degree of turbulence for the heat transfer from the shaped plate or pair of shaped plates to the coolant.

[0045] This enables good heat transfer to the coolant with a very compact design. The volume and weight of a coolable resistor are reduced by several times compared to liquid-cooled braking resistors currently on the market.

[0046] Furthermore, the simple design and the use of identical parts result in a very low number of parts, which leads to cost reduction.

[0047] By scaling the number of forming sheet pairs, the performance class can be easily scaled and a modular design is possible, depending on the performance requirements.

[0048] Preferably, the first, second, third, and / or fourth beads of two formed sheets are joined together by a joint, preferably a laser weld. Such joining methods are easy to implement and cost-effective. Flanging or resistance roll welding are also possible.

[0049] Further preferably, any number of shaped sheets (two shaped sheets each form a shaped sheet pair) are connected to one another, and even more preferably arranged in parallel. The shaped sheet pairs are thus stackable.

[0050] As an outer boundary, a closure plate is preferably provided in each case, wherein a second side of the uppermost shaped sheet is connected to a first closure plate and forms a flow channel with the latter, and wherein a second side of the lowermost shaped sheet is connected to a second closure plate and also forms a flow channel with the latter.

[0051] This allows for a modular arrangement of the shaped plate pairs with a maximum compact design, and furthermore, no additional housing is required to maintain the protection level. The systemic pressure can be absorbed by the end plates, thus ensuring that the inner shaped plate pairs (whose shaped plates are preferably thinner than the end plates) are pressure-resistant.

[0052] The force vectors of the coolant pressure therefore cancel each other out, so no further external stresses arise.

[0053] Preferably, an inlet nozzle and / or an outlet nozzle are provided either on the first end plate or on the second end plate.

[0054] However, one of the two nozzles can also be located on the first end plate, and the other on the second end plate. However, the inlet nozzles and / or outlet nozzles could also be arranged arbitrarily, provided the shaped sheet metal adheres to the condition of axial symmetry and the inlet nozzles and / or outlet nozzles are parallel to the normal vector of the shaped sheet metal side.

[0055] The inlet nozzle is in fluid communication with all inlet openings of all pairs of shaped plates and thus also with the shaped plates, and the outlet nozzle is in fluid communication with all outlet openings of all pairs of shaped plates and thus also with the shaped plates.

[0056] Since all pairs of shaped plates have inlet and outlet openings, internal collection areas are formed, from which fluid is distributed or collected. Fluid can thus flow around all pairs of shaped plates.

[0057] The flow between the stacks is directed from the internal collection areas into the individual spaces between pairs of shaped plates, where one or more deflections guide the flow to the opposite collection area.

[0058] A single diversion, in particular, results in a low internal pressure loss. Thus, by setting up a parallel connection of the coolant flow, starting from a collection area and ideally with only one diversion, a low pressure loss can be achieved.

[0059] Preferably, respective contact surfaces of two opposite first sides of two shaped sheets in a coolable resistor are each connected to a connection element, which preferably protrudes beyond the shaped sheets or the pair of shaped sheets.

[0060] Preferably, connection elements are arranged on the opposite side of the inlet opening and outlet opening - for example, the inlet opening and outlet opening are arranged on one short side of a rectangle, the connection elements on the other short side.

[0061] For a system comprising multiple coolable resistors, an electrical interface such as a connector with at least one contact element is preferably provided. However, there must be as many contact elements as there are connection elements provided - usually two per coolable resistor (positive pole and negative pole - however, more than two connection elements can be provided for phase current). The position of the connection elements can be varied in such a way that, when assembled, a multi-phase system can be connected; the connection elements for each phase are not directly above one another.

[0062] The connection elements are each adapted to be connected to a contact element of the electrical interface or connector, wherein a contact element preferably further comprises spring-loaded clips. These ensure that secure contact can be established with the connection elements, and the assembly of the connector (which may contain multiple contact elements) is also simple. Thus, the available current can be easily distributed to a system of coolable resistors.

[0063] In the following, a preferred embodiment of the present invention is described in more detail with reference to the accompanying figures. Fig. 1 shows a first side of a shaped sheet with printed insulation and an electrically conductive device. Fig. 2 shows a shaped sheet with the second side (coolant side) facing upwards. Fig. 3a shows a coolable resistor according to the invention, composed of two shaped sheets (pair of shaped sheets), in plan view according to an embodiment of the present invention. Fig. 3b shows three detailed cross-sectional views of the coolable resistor according to the invention. Fig. 4 shows a coolable resistor according to the invention in an isometric view as a partial sectional view. Fig. 5 shows a coolable resistor (system consisting of several pairs of shaped sheets) in plan view. Fig. 6 shows the system in a sectional view and in detail of the flow inlet (left) and the electrical connection (right). Fig. 7 shows a coolable resistor (system consisting of several pairs of shaped sheets) in an isometric view.

[0064] In Fig. 1 a first side FE, the resistance side, of a shaped sheet F is shown in isometric view.

[0065] The shaped sheet F is surrounded on three sides by a first bead 1, which projects diagonally upwards from the shaped sheet F. Beads are groove-shaped depressions or elevations in a sheet. Two openings 12, 13 are provided in the shaped sheet F, here an outlet opening 12 and an inlet opening 13. These are each surrounded by a third bead 5, which also projects upwards from the shaped sheet F. The first bead 1 and the third beads 5 are designed in such a way that they form a plane and, in conjunction with another shaped sheet and its corresponding first and third beads (not shown here), create a cavity.

[0066] An electrically insulating layer 2 is arranged in the interior region of the first side FE of the shaped sheet F. The electrically conductive device 4 is arranged thereon in a meandering pattern. Furthermore, two contact surfaces 3a, 3b are provided, each of which is connected to one end of the electrically conductive device 4. At the end of the shaped sheet F facing away from the outlet opening 12 and inlet opening 13, on which no first bead 1 is provided, a clearance 8 in the form of a recess is provided. Connection elements (not shown here) can be arranged in this recess.

[0067] In Fig. 2 a second side FZ of the formed sheet, the coolant side, is shown in isometric view.

[0068] Second beads 7 protrude upwards on four sides of the shaped sheet F on the second side FZ and therefore extend in the opposite direction to the first bead 1. On one short side of the shaped sheet F there is a fifth bead 9 which is wider than the second beads 7 - this is the back of the cutout 8 on the first side FE. Furthermore, in the middle between the two long sides FZ of the shaped sheet F there is a fourth bead 6 arranged parallel to the first bead, which however does not extend over the entire length of the shaped sheet F. The second bead 7 and the fourth bead 6 are of the same height so that they form a plane. The fifth bead 9 is slightly offset to ensure a cavity for cooling the connection area. The second beads 7 form a circumferential contour which closes off a cavity when another shaped sheet is arranged (not shown here), thus defining the coolant area.The fourth bead 6 serves to guide the flow between the inlet and outlet 13, 12.

[0069] In Fig. 3a is a coolable resistor W according to the invention, consisting of two shaped sheets F, F' (hereinafter also referred to as a pair of shaped sheets), shown in plan view - here you can see the second side FZ of one shaped sheet F (the further shaped sheet F' connected to the shaped sheet F is not visible here). The first beads 1, 1' of the shaped sheets F, F' are connected by a material-to-material process, for example lasering, gluing, resistance welding or similar, to create a cavity (not visible in this figure). The second bead 7 (for connecting to further pairs of shaped sheets and for coolant sealing) is also visible on the top side of the second side FZ of the shaped sheet F. The fourth bead 6 serves to guide the flow between the inlet and outlet 13, 12. The fifth bead 9 can be seen at the right edge of the shaped sheet F. The second bead 7 serves to connect to a second side of another shaped sheet F" (not shown here).Furthermore, a first and second connection element 10a, 10b, which are preferably made of copper or another highly conductive material, protrude above the coolable resistor W, here on the side of the shaped sheet F facing away from the inlet 13 and outlet 12.

[0070] In Fig. 3b are detailed cross-sectional views of the coolable resistor W according to the invention from Fig. 3a shown.

[0071] The bottom view represents a cross section AA (position in Fig. 3a shown). This shows that two shaped sheets F, F' are connected to each other at their respective first beads 1, 1'. At the right end, a first connection element 10a protrudes above the coolable resistor W.

[0072] The middle view, which shows details of the left and right ends of the coolable resistor W, clearly shows that the edge areas of the coolable resistor W are filled with a filler 11, in this case silicone. The silicone additionally seals the inner space of the coolable resistor W.

[0073] The top view shows more details of the right edge area. Here, it can be seen that two first contact surfaces 3a, 3a', each arranged on the inner side of two shaped sheets F, F', are both electrically connected to a first connection element 10a. The corresponding cavity between the two shaped sheets F, F' is in turn filled with a filler 11.

[0074] In Fig. 4 the coolable resistor W is shown in an isometric partial sectional view. It is shown here that two shaped sheets F, F' are connected, among other things via the respective first beads 1, 1' and third beads 5, 5' (not shown here) - by connecting two third beads 5, 5' of the two shaped sheets F, F', a common inlet 13 and outlet 12 are formed, without liquid being able to penetrate into the interior of the coolable resistor W. The third beads 5, 5' therefore serve to close the pair of shaped sheets in the area of ​​the coolant guide.

[0075] This allows for a design as a pair of shaped plates, with one shaped plate serving as the resistor carrier and one shaped plate for coolant separation. The two shaped plates F, F' form a coolable electrical resistor W.

[0076] The second side from the top of the shaped sheet F' is shown, i.e. the side along which coolant is to flow - this flows from the inlet 13 to the outlet 12, it is directed at the edge by the second bead 7, as well as the fourth bead 6, which serves to guide the flow.

[0077] Furthermore, it can be seen that the two shaped sheets F, F' enclose an inner cavity - this is filled with a filler 11 on the right edge - the first connecting element 10a is embedded in this filler and is also insulated by the filler from the two shaped sheets F, F'.

[0078] In Fig. 5 several pairs of shaped sheets W (only the top one is visible here) are shown in a top view. The inlet nozzle 14 and the outlet nozzle 15 are shown, which are attached to the inlet 13 and outlet 12 (not shown here). The fourth bead 6, which is located within the first pair of shaped sheets, is indicated by dashed lines. Arrows outline the flow direction of the coolant within the topmost coolable resistor W. The coolant flows within all of the coolable resistors arranged one above the other from the inlet nozzle 14 to the outlet nozzle 15 and is distributed among them depending on the number of coolable resistors arranged one above the other. A plug 20 is arranged on the right edge, which serves for the electrical connection.

[0079] In Fig. 6 is the sectional view of an exemplary system along the line BB in Fig. 5 shown, where hydraulically parallel connected coolable electrical resistors (pair of shaped plates) W, W', ... and a corresponding electrical connection are shown.

[0080] The bottom view shows an overall sectional view.

[0081] The inlet nozzle 14 is attached to an upper end plate 17.

[0082] The coolant reaches the individual coolable electrical resistors W, W'... via the inlet nozzle 14 and is distributed parallel into the intermediate spaces, where it exits again at the outlet nozzle 15 (not shown here) after being deflected.

[0083] The inlet opening 13 and outlet opening 12 (not shown here) of the individual coolable resistors W, W', ..... form internal collectors, so to speak, which are then fluidly connected to the inlet connection 14 and the outlet connection 15. This enables the hydraulic parallel connection of the individual coolable resistors W, W, ..... A small number of deflections allows for a low internal pressure loss.

[0084] A lower end plate 16 and an upper end plate 17 are arranged at the respective beginning and end of the lined-up coolable electrical resistors W, W', ..., i.e., pairs of shaped sheets. The lower end plate 16 and the upper end plate 17 are designed to be sufficiently rigid to withstand the systemic compressive stress. The lower end plate 16 can be used to secure the entire system and, along with the upper end plate 17, forms the attachment of the front plate 18 at the right edge, to which a protective cap 19 is attached. The connector 20, which includes contact elements 21, is attached to the protective cap 19.

[0085] The upper right detailed view shows that a contact element 21 is designed to accommodate spring-loaded clips 22 made of a material with good electrical conductivity. A round cutout and a transverse locking mechanism, for example, a tongue and groove combination (not shown here), prevent the clips 22 from becoming loose. The clips 22 are slightly undersized and expand slightly when the contact elements 10b are inserted. The internal load on the contact element 21 in the area of ​​the clips 22 is very low and only requires reinforced material at the edges.

[0086] The upper left detailed view shows how coolant enters through the inlet nozzle 14 and flows between the uppermost coolable resistor W and the upper end plate 17 as well as between the uppermost and second uppermost coolable resistors W, W'.

[0087] In Fig. 7The entire system is arranged in an isometric view and illustrates the compact design of a braking resistor with integrated connection plug 20.

[0088] Several coolable resistors W, W', ... are arranged beneath the upper end plate 17. The inlet connection 14 and the outlet connection 15 for the coolant are also located on the upper end plate 17. Optional sensors for monitoring the coolant temperature can be attached to the connection ports (not shown here). The front plate 18 is attached to the front end and is covered by the protective cap 19. The connector 20 can be attached to the protective cap 19.

[0089] The present invention is not limited to the embodiment described above. For example, the inlet and outlet ports 14 and 15 can take on various geometric shapes, as can the inlet 13 and outlet 12.

[0090] The coolable resistors W or shaped sheets F are preferably rectangular, but can also take on other geometric shapes, such as round, oval, polygonal - depending on the available space.

[0091] The present invention relates to a shaped sheet F and a liquid-cooled resistor which is constructed from several shaped sheets F, F', ..., F n<.

[0092] The shaped sheets F have a first side FE which is coated with an electrically insulating layer 2, wherein an electrically conductive device 4 is applied to the electrically insulating layer 2 or embedded therein, and a second side FZ which can be flowed onto by coolant.

[0093] By connecting several shaped sheets F, F', ..., F n< a coolable resistor is created which is very compact, space-saving and scalable. LIST OF REFERENCE SYMBOLS

[0094] FFormed sheet FEfirst side FZsecond side Wcoolable resistor / shaped sheet pair 1first bead 2electrically insulating layer 3afirst contact surface 3bsecond contact surface 4electrically conductive device 5third bead 6fourth bead 7second bead 8clearance 9fifth bead 10afirst connection element 10bsecond connection element 11filler 12outlet 13inlet 14inlet nozzle 15outlet nozzle 16lower end plate 17upper end plate 18front plate 19protective cap 20electrical interface / connector 21contact element / copper 22spring clip

Claims

1. Shaped metal sheet (F), having: a first side (FE) which is coated with an electrically insulating layer (2), wherein an electrically conductive device (4) is applied to or embedded into the electrically insulating layer (2), as well as a second side (FZ), wherein an inlet opening (13) and an outlet opening (12) are provided in the shaped metal sheet (F), wherein a first bead (1) is provided on an edge of the first side (FE), and furthermore third beads (5) are also provided on the first side, which surround the inlet opening (13) and the outlet opening (12).

2. Shaped metal sheet (F) according to claim 1, wherein the first bead (1) protrudes from the first side (FE), preferably at an angle, and preferably a second bead (7) is provided on an edge of the second side (FZ), and further preferably furthermore at least one fourth bead (6) is also provided on the second side (FZ), and wherein the shaped metal sheet (F) is preferably made of stainless steel.

3. Shaped metal sheet (F) according to claim 1 or 2, wherein at least two contacting surfaces (3a, 3b) are provided on the first side (FE), which are each electrically conductively connected to one end of the electrically conductive device (4), wherein furthermore a clearance (8) is provided on one edge of the first side (FE), which is adjacent to the at least two contacting surfaces (3, 3).

4. Coolable resistor (W), which comprises at least two shaped metal sheets (F, F') according to any one of the preceding claims, wherein the respective first side (FE, FE') of two shaped metal sheets (F, F') is arranged opposite one another and both shaped metal sheets (F, F') are connected to one another at the respective first beads (1, 1') and third beads (5, 5').

5. Coolable resistor according to claim 4, wherein the cavity between the respective first sides (FE, FE') of two shaped metal sheets (F, F') is filled at least partially with a nonconductive filler (11), wherein the filler (11) preferably contains silicone.

6. Coolable resistor (W) according to any one of the preceding claims, wherein the respective second sides (FZ, FZ') of two shaped metal sheets (F, F') are arranged opposite one another and both shaped metal sheets (F, F') are connected to one another other at the respective second beads (7, 7'), and preferably the fourth beads (6, 6') are connected to one another, and thus a flow path is defined between the respective second sides (FZ, FZ') of the two shaped metal sheets (F, F'), which flow path is adapted to allow a fluid to flow from the inlet opening (13) to the outlet opening (12).

7. Coolable resistor (W) according to any one of claims 4 to 6, wherein the first, second, third and / or fourth beads (1, 1'; 7, 7'; 5, 5'; 6, 6') of two shaped metal sheets (F, F') are connected to one another by a joint, preferably a laser weld seam.

8. Coolable resistor (W) according to any one of claims 4 to 7, wherein any number of shaped metal sheets (F, F', ..., Fn) or pairs of shaped metal sheets (W, W, ..., Wn) are connected to one another, wherein an end plate (16, 17) is provided as an outer delimitation in each case, wherein a second side (FZ) of the first shaped metal sheet (F) is connected to a first end plate (16) and forms a flow channel therewith, and wherein a second side (FZ) of a last pair of shaped metal sheets (Wn) is connected to a second end plate (17) and forms a flow channel therewith, wherein any number of shaped metal plates (F, F', ..., Fn) are preferably arranged in parallel.

9. Coolable resistor (W) according to claim 8, wherein an inlet connector (14) and an outlet connector (15) are provided either on the first end plate (6) or on the second end plate (17), wherein the inlet connector (14) is in fluid connection with all inlet openings (13, 13', ..., 13n) of all shaped metal sheets (F, F', ..., Fn), and the outlet connector (15) is in fluid connection with all outlet openings (12, 12', ..., 12n) of all shaped metal sheets (F, F', ..., Fn) or pairs of shaped metal sheets (W, W, ..., Wn).

10. Coolable resistor (W) according to any one of claims 4 to 9, wherein the shaped metal sheets contained therein are configured according to claim 3, wherein the respective contacting surfaces (3a, 3b; 3a', 3b') of two opposing first sides (FE, FE') of two shaped metal sheets (F, F') are each connected to a connecting element (10a, 10b), which preferably projects beyond the shaped metal sheets (F, F').

11. Coolable resistor according to claim 10, furthermore having an electrical interface (20) with at least one contact element (21), wherein the connecting elements (10a, 10b) are adapted to each be connected to a contact element (21a, 21b), wherein a contact element (21a, 21b) preferably has resilient clips (22).