FR3003809A1 - DEVICE FOR ELECTRICALLY HEATING FLUID FOR MOTOR VEHICLE AND HEATING CIRCUIT THEREFOR - Google Patents

Abstract

Motor vehicle fluid, comprising: - at least one heating element (7a, 7b), and - a control means (3) for the heating element (7a, 7b) comprising an electrical circuit board support (13). According to the invention, said device further comprises an electrical connection (17) electrically connecting the heating element (7a, 7b) to the electrical circuit board support (13), said electrical connection (17) comprising at least one piece of interconnection (19) adapted to be assembled with the heating element (7a, 7b) and carrying at least two electrical connectors (21, 22) electrically connected on the one hand to the associated heating element (7a, 7b) and on the other hand to the circuit board support (13). The invention also relates to a heating circuit of a vehicle interior, comprising such a heating device.

Description

The invention relates to an electric fluid heating device for a motor vehicle. The invention also relates to a heating circuit comprising such a heating device. The invention applies more particularly to heating and / or air conditioning apparatus for motor vehicles comprising such a heating device. Usually, the heating of the air for heating the passenger compartment of a motor vehicle, as well as demisting and defrosting, is ensured by the passage of a flow of air through a heat exchanger more specifically by heat exchange between the air flow and a fluid. This is usually the coolant in the case of a heat engine. However, this heating mode may be unsuitable or insufficient to ensure a rapid and efficient heating of the passenger compartment, in particular to ensure a warming of the passenger compartment or defrosting or demisting before use of the vehicle in very cold environment or again when a very rapid rise in temperature is desired. In addition, in the case of an electric vehicle, the heating function is no longer performed by the circulation of the cooling fluid in the heat exchanger. However, it is possible to provide a water circuit for heating the passenger compartment, but this heating mode may also be inadequate or insufficient to ensure rapid and efficient heating of the passenger compartment of the vehicle. Moreover, in order to reduce the space requirement and the cost due to the additional water circuit, it is also known to use an air conditioning loop operating in heat pump mode for the electric vehicle. Thus, the air conditioning loop conventionally to cool a flow of air with a refrigerant is in this case, used to heat the air flow. It is necessary to do this to use an evaporator of the air conditioning loop as a condenser. However, such a heating mode may also be inappropriate or insufficient. Indeed, the performance of the air conditioning loop in heat pump mode depends on the external climatic conditions. For example, when the outside air temperature is too low, this air can not be used as a source of thermal energy. In order to heat the air, a known solution is to add to the heat exchanger or the water circuit or the air conditioning loop, an additional electric heating device. The additional electric heating device may be adapted to heat a fluid, such as the cooling fluid of the heat engine, or the water of the heating water circuit of the passenger compartment of the electric vehicle or the refrigerant fluid of the loop. air conditioning. For this, the additional electric heating device comprises a heating element 10 in contact with the fluid to be heated and a control means provided with a temperature sensor for the temperature control of the heating element. One of the aims of the present invention is to propose an electric vehicle fluid heating device whose connection between the heating element and the control module is at the same time simple, compact and robust. To this end, the subject of the invention is an electric fluid heater for a motor vehicle, comprising: at least one heating element, and a control means for the heating element comprising an electrical circuit card support, characterized in that said device further comprises an electrical connection electrically connecting the heating element to the electrical circuit board support, said electrical connection comprising at least one interconnection piece adapted to be assembled with the heating element and carrying at least one two electrical connectors electrically connected on the one hand to the associated heating element and on the other hand to the support 25 of electrical circuit board. The interconnection piece can be simply assembled to the heating element to electrically connect it to the electrical circuit board holder via the electrical connectors. In addition, this interconnection piece provides mechanical holding of the electrical connectors against the heating element and centering / positioning of the heating elements. The electric heater may further include one or more of the following features, taken separately or in combination: the interconnect piece is removable, and can therefore be easily placed and interchanged; the electrical connection comprises at least a first electrical connector for supplying the heating element, and at least a second electrical connector for transmitting an information signal of the temperature of the heating element; said electrical connectors respectively have at least one contact blade configured to contact an electric electrical connection surface of the heating element; said electrical connectors respectively have electrical contacts whose ends pass through the electrical circuit board holder, for fixing the interconnection piece to the electrical circuit board holder; the electrical connection comprises at least one mechanical holding means configured to mechanically maintain said electrical connectors against the heating element, by mechanical cooperation between the interconnection piece and the heating element. The interconnection piece thus makes it possible to connect both mechanically and electrically the heating element or elements to the electrical circuit board support; the heating element has a substantially cylindrical shape and the interconnection plate has a connecting surface substantially at least partially matching the cylindrical periphery of the heating element. The mechanical cooperation between the interconnection piece and a heating element, and therefore the holding means is by form cooperation; the interconnection plate has at least one substantially annular opening adapted to receive the associated heating element, in particular one of its ends; the interconnect plate is assembled on one side of the electrical circuit board holder opposite the heating element. The interconnection piece is therefore easily interposed between the electrical circuit board support and the heating element (s) during assembly to make the electrical connection; the heating element comprises at least one heating resistor produced by screen printing in the form of a resistive track; said device comprises two heating elements and the electrical connection comprises a common interconnection piece electrically connecting the two heating elements to the electrical circuit board support. The interconnection piece thus allows a simple way the electrical connection of the two heating elements to the electrical circuit board support; the heating elements are arranged side by side, so as to reduce the size of the heater in the longitudinal direction. In addition, this arrangement has a low heating inertia and a low pressure drop. The invention also relates to a heating circuit of a vehicle passenger compartment characterized in that it comprises a heating device as defined above. Other features and advantages of the invention will emerge more clearly on reading the following description, given by way of illustrative and nonlimiting example, and the appended drawings in which: FIG. 1 represents an electric heating device of motor vehicle fluid according to a first embodiment of the present invention, partially depicted in transparency, FIG. 2 shows the electric heater of FIG. 1 shown without fluid inlet housing, FIG. Fig. 4 is a partial perspective view of the heater of Fig. 3 from which an electrical circuit board holder has been removed. Fig. 5 shows a view of the heating device of Fig. 1 according to the first embodiment. a schematic and simplified view of heating elements of the heating device and their electrical connection to the support of 6 illustrates schematically and schematically a perspective view of a first face of an interconnection plate of the heater according to a second embodiment, FIG. perspective view showing a first perspective view of the interconnection plate assembled to two heating elements of the heating device, Figure 8 schematically and simplified a perspective view of a second face of the interconnection plate of the heater according to the second embodiment, and Figure 9 is a perspective view showing a second perspective view of the interconnecting plate assembled to two heating elements of the heater.

In these figures, the substantially identical elements bear the same references. Figures 1 to 4 show an electric fluid heater 1 for a motor vehicle for a heater and / or air conditioning. The electric heating device 1 is for example an additional heating device 15 for heating water before entering a water heating circuit for heating the passenger compartment of an electric vehicle. In another example, the electric heating device 1 is disposed upstream of an evaporator of an air conditioning loop capable of operating in heat pump mode, so as to heat the refrigerant. According to yet another example, the electric heating device 1 is arranged upstream of a heat exchanger using the cooling fluid of a heat engine as heat transfer fluid. It would also be possible to provide such an electric heating device 1 upstream of a heat exchanger intended for the thermal regulation of a storage device 25 of electrical energy, sometimes referred to as a set of batteries, for a propulsion vehicle. electric or hybrid. The electric heater 1 shown includes first and second heater modules 2a, 2b, control means 3, a fluid inlet housing and a fluid outlet housing (not shown). Only one fluid inlet box 30 is shown in FIG. 1. Each heating module 2a, 2b has a core, for example hollow (not visible in the figures), and a heating element 7a, 7b produced under the shape of a cylindrical envelope surrounding the core (not shown) so as to define a fluid guide circuit to be heated between the outer surface of the core (not shown) and the inner surface of the shell of the heating element 7a , 7b. The guiding circuit is the volume located between the outer surface of the core (not shown) and the inner surface of the shell of the heating element 7a, 7b in which fluid can flow from the fluid inlet housing 5 to the fluid outlet housing (not shown).

The heating modules 2a, 2b have a substantially cylindrical general shape defined by the casing of the heating element 7a, 7b. The guiding circuit thus has an annular shape extending along the longitudinal axis A of the core (not shown) and of the heating element 7a, 7b, so that the flow of the fluid is guided substantially parallel to the axis. longitudinal A (Figure 1). Each heating element 7a, 7b has at least one electric heating means such as a heating resistor 8 (see FIG. 5). This heating resistor 8 can be made in the form of a resistive track 8. According to the embodiment shown in FIG. 5, a heating element 7a, 7b has two electric heating means made in the form of two resistive tracks 8 The two resistive tracks 8 extend for example parallel to each other over the height of a heating element 7a, 7b. The two resistive tracks 8 are for example nested one inside the other, superimposed on one another or interlaced. The two resistive tracks 8 extend at least partially over the outer surface of the heating element 7a, 7b. The resistive tracks 8 are for example made by screen printing on the outer surface of the heating element 7a or 7b, that is to say on the surface opposite to the surface of the heating body 7a, 7b opposite the core (not illustrated in the figures). The resistive tracks 8 are therefore out of the fluid guide circuit to be heated. According to the present invention, the heat produced by the resistor is directly transmitted to the fluid to be heated through the wall of the corresponding heating body 7a or 7b, which minimizes heat losses and reduces the thermal inertia of the device, the fluid can therefore -7- be heated quickly. Moreover, the heating modules 2a, 2b can be identical and arranged side by side in substantially parallel manner as illustrated in FIGS. 1 to 4. This side-by-side arrangement makes it possible to reduce the space requirement of the heating device 1 in the direction longitudinal. In addition, this arrangement has a low heating inertia and a low pressure drop. According to the embodiment illustrated in FIG. 1, a fluid inlet box 5 has a substantially parallelepipedal base 9 receiving the respective inlet ends 10 of the heating modules 2a, 2b. The fluid inlet box 5 also comprises a projecting intake pipe 10 of the device 1. The intake projection pipe 10 is connected in parallel to the two circuits for guiding the heating modules 2a, 2b. To do this, the protruding intake manifold 10 communicates respectively with the guide circuit of the first heating module 2a and the guiding circuit of the second heating module 2b. The inlet and fluid outlet boxes 5 may be connected symmetrically at the two opposite ends of the heating modules 2a, 2b. The flow of the fluid is thus effected from the fluid inlet pipe 10, then in parallel in the guiding circuits of the heating modules 2a, 2b and spring in the outlet pipe (not shown) of the outlet casing fluid (not shown). With regard to the control means 3 of the heating elements 7a, 7b, it comprises an electric circuit support 13, better visible in FIGS. 2 and 3, and a temperature sensor 14 associated with each heating element 7a, 7b ( see Figure 5). The control means 3 of the heating modules 2a, 2b is electrically powered. For this purpose, a high-voltage electrical harness 11 is better visible in FIGS. 1 to 3. In the example shown, the bundle 11 is divided into two channels 12 for supplying the electrical circuit support 13. The temperature sensors 14 are configured to measure the temperature of a respective heating element 7a, 7b. The temperature sensors 14 comprise, for example, a thermistor, such as a "CTN" (Negative Temperature Coefficient), the resistance of which decreases uniformly with the temperature. 14 is for example brazed or welded to the outer surface of the respective heating element 7a, 7b, that is to say out of the guiding circuit, for example two connection surfaces 15a, 15b are provided for this purpose on the external surface of the heating element 7a or 7b The control means 3 controls the heating elements 7a and 7b by controlling the supply of a heating resistor, for example screen-printed in the form of resistive tracks 8 on the external surface of the heating element 7a and 7b. heating element 7a or 7b, as shown schematically in Figure 5. For this purpose, there is provided on the outer surface of the heating element 7a or 7b two connection surfaces 16a, 16b elec The control means 3 is electrically connected to these connection surfaces 16a, 16b. The control means 3 can control the supply of the heating resistors according to a heating set point and the temperature measured by the temperature sensor 14 of each heating element 7a, 7b. The fluid is thus heated by heat exchange between each heating element 7a, 7b and the fluid flowing in the guiding circuit. The electrical circuit support 13, such as a printed circuit board (or PCB in English for "Printed circuit board"), carries the electronic and / or electrical components. These electronic and / or electrical components may for example comprise a microcontroller, one or more electric current switches for controlling the power supply of the heating elements 7a, 7b, electrical tracks connecting the heating elements 7a, 7b to the electric current switches. , high-voltage power connectors, a low-voltage power connector, and a data bus, for example.

The heating device 1 further comprises an electrical connection 17 as shown in FIG. 2, electrically connecting the heating element 7a, 7b to the electrical circuit card support 13 as shown diagrammatically in FIG. 5. Referring to FIGS. 2 and 6 to 9, the electrical connection 17 comprises: - at least one interconnection piece 19 adapted to be assembled with at least one heating element 7a or 7b, and - at least two electrically connected electrical connectors 21 and 22 of a 5 to the associated heating element 7a, 7b and to the electrical circuit board support 13. The interconnection piece 19 forms a support for the electrical connectors 21, 22. This interconnection piece 19 is interposed between a respective heating element 7a, 7b and the electrical circuit board support 13. This interconnection piece 19 is for example removable. According to the embodiment described illustrated in Figures 6 to 9, the electrical connector 17 comprises a common interconnection piece 19 associated with the two heating elements 7a, 7b. The interconnection piece 19 is thus interposed between the two heating elements 7a and 7b and the electrical circuit card support 13. More specifically, the interconnection piece 19 has a first face 19A arranged opposite the electrical circuit board support 13 and a second opposite face 19B facing the heating elements 7a, 7b. For the assembly of the interconnection piece 19 with at least one heating element 7a and / or 7b associated, the electrical connection 17 comprises a mechanical holding means 20 configured to mechanically hold the interconnection piece 19 against the heating element 7a, 7b, in this example against one end of the heating element 7a, 7b. The mechanical holding means is according to the embodiment formed by mechanical cooperation between the interconnection piece 19 and the end of each heating element 7a, 7b. To this end, the interconnection piece 19 may have at least one housing, such as an opening 23, adapted to receive an associated heating element 7a, 7b, and more particularly, the end of this heating element 7a, 7b . The end of a heating element 7a, 7b can be forcefully mounted in an associated opening 23 of the interconnection plate 19 which forms a mechanical holding means and provides the electrical connection of the heating elements 7a, 7b to the support According to the example illustrated in the figures, the interconnection piece 19 has two openings 23 respectively associated with a heating element 7a or 7b. An opening 23 thus has a shape complementary to the end of a heating element 7a or 7b associated. Specifically, the openings 23 of the interconnection plate 19 at least partially match the shape, here cylindrical, of the heating element 7a, 7b. Each opening 23 thus forms a connecting surface substantially at least partially matching the cylindrical periphery of the heating element. As said above, a heating element 7a, 7b is for example of substantially cylindrical shape. In this case, an opening 23 associated with a heating element 7a, 7b is for example substantially annular. In addition, the interconnection piece 19 has as an example a generally oblong general shape with two substantially annular openings 23. In addition to the holding function, the interconnection piece 19 provides a centering / positioning function of the heating elements 7a, 7b. Furthermore, the interconnection piece 19 is made of electrically insulating material. The interconnection piece 19 may for example be made of plastic material. Such a material must be able to withstand high temperatures to which the heating device 1 is subjected during operation. The material of the interconnection piece 19 may comprise, by way of nonlimiting example, a thermoplastic material, such as polybutylene terephthalate known by the acronym PBT having a rigidity and a very high mechanical strength and which possesses excellent electrical insulation properties. The material may also comprise polyamide 6-6 known as PA 6-6. Furthermore, by reference, the electrical connection 17 comprises at least a first connector 21 for supplying the heating resistor of the heating elements 7a and 7b via the serigraphed tracks 8 (see FIG. 5) to each heating element 7a, 7b, and at least one second connector 22 for transmitting a temperature information signal to the control means 3. Referring again to FIGS. 2 and 6 to 9, the common interconnection piece 19 for the two modules The two electrical connectors 21 and 22 are for example common to both heating elements 7a and 7b. More specifically, the electrical connector 17 comprises a first electrical connector 21 common to the two heating elements 7a and 7b and a second connector 22 common to the two heating elements 7a and 7b. The first connector 21 and the second connector 22 comprise electrical contacts extending on either side of the interconnection piece 19 on the one hand to the heating elements 7a, 7b to contact the serigraphed tracks 8 and the sensors of temperature 14, and secondly towards the electrical circuit board support 13. With reference to Figures 2 and 6 to 9, the first connector 21 has on the second face 19B of the interconnection piece 19, at least two first electrical contacts 25a, 25b or 25c, 25d adapted to be arranged on the connecting surfaces 16a, 16b for contacting the serigraphed tracks 8 of the associated heating element 7a or 7b, for supplying the heating resistor of the heating elements 7a and 7b via the serigraphed tracks 8 on each heating element 7a, 7b. By way of example, the first common connector 21 has on the second face 19B of the interconnection piece 19 four first electrical contacts 25a, 25b, 25c, 25d (better visible in FIG. 6) intended to be arranged on the surfaces. connection 16a, 16b to contact the serigraphed tracks 8 of the associated heating element 7a, 7b (see Figure 5).

The second connector 22 has meanwhile on the second face 19B of the interconnection piece 19, at least two second electrical contacts 27a, 27b or 27c, 27d (better visible in Figure 6) intended to be arranged on the surfaces of connection 15a, 15b to be connected to the temperature sensor 14 of each heating element 7a, 7b (see Figure 5). For example, the second common connector 22 has on the second face 19B of the interconnection piece 19 four second electrical contacts 27a, 27b, 27c, 27d connected in pairs to a temperature sensor 14 of a heating element 7a, 7b associated. The four second electrical contacts 27a, 27b, 27c, 27d comprise for example two second electrical contacts 27a, 27b connected to the temperature sensor of the first heating element 7a and two second electrical contacts 27c, 27d to the temperature sensor 14 of the second heating element 7b, via the respective connection surfaces 15a, 15b, for measuring the temperature and transmitting a temperature information signal to the control means 3. The first electrical contacts 25a, 25b, 25c, 25d and the second electrical contacts 27a, 27b, 27c, 27d respectively have at least one contact blade 29, 31 adapted to contact a corresponding connection surface 15a, 15b, 16a, 16b of the heating element 7a or 7b. According to the example illustrated in Figures 1 to 4, the electrical contacts 25a, 25b, 25c, 25d and 27a, 27b, 27c, 27d respectively have more than one contact blade, for example three contact blades 29, 31 fit contacting a corresponding connecting surface 15a, 15b, 16a, 16b of the heating element 7a or 7b. The number of contact blades can be increased to make the electrical connection more reliable. A first electrical contact 25a, 25b, 25c, 25d for example has a common base fixed to the interconnection piece 19, here on the second face 19B of the interconnection piece 19, and several, for example three, blades. contact 29 free to bear against the heating element 7a, 7b. Similarly, a second electrical contact 27a, 27b, 27c, 27d for example has a common base fixed to the interconnection piece 19, here on the second face 19B of the interconnection piece 19, and several, for example three, contact blades 31 free to bear against the heating element 7a, 7b. In addition, the first connector 21 includes ends of the first electrical contacts 25a, 25b, 25c, 25d extending from the first face 19A of the interconnection piece 19 to the electrical circuit card holder 13. According to the embodiment of FIG. As illustrated in FIGS. 1 to 4, the first electrical contacts 25a, 25b, 25c, 25d respectively have at least one end 33, for example two ends 33 (better visible in FIG. 4) extending towards the card support. The electrical circuit board support 13 is traversed by the ends 33 of the electrical contacts 25a, 25b, 25c, 25d of the first connector 21. The first electrical contacts 25a, 25b, 25c, 25d according to the embodiment 1 to 4 show, on one side of the interconnection piece 19, three contact blades 29 and on the other side of the interconnection piece 19, two ends 33 adapted to FIG. plug in the circuit board holder 13. -13- Of course, the number of contact blades 29 and the number of ends 33 of the first electrical contacts 25a, 25b, 25c, 25d extending towards the card support electrical circuit 13 can be adapted as needed. Regarding the second connector 22, it has ends 35 of 5 second electrical contacts 27a, 27b, 27c, 27d extending from the first face 19A of the interconnection piece 19 to the electrical circuit card holder 13 According to the embodiment illustrated in FIGS. 1 to 4, the second electrical contacts 27a, 27b, 27c, 27d respectively have at least one end 35 extending towards the electrical circuit card holder 13. The card holder electrical circuit 13 is traversed by the ends 35 of the second electrical contacts 27a, 27b, 27c, 27d of the second connector 22. Of course, the number of contact blades 31 and the number of ends 35 of the electrical contacts 27a, 27b, 27c, 27d extending towards the electrical circuit board support 13 may be adapted as required.

Thus, the electrical circuit board support 13 is traversed by the electrical contacts 25a, 25b, 25c, 25d, 27a, 27b, 27c, 27d of the two electrical connectors 21 and 22. The embodiment variant illustrated in FIGS. 9 differs from the first embodiment with reference to FIGS. 1 to 4, in that the first electrical contacts 25a, 25b, 25c, 25d and the second electrical contacts 27a, 27b, 27c, 27d respectively have a single contact blade 129, 131 adapted to contact a corresponding connecting surface 15a, 15b, 16a, 16b of the heating element 7a or 7b.

The contact blades 129, 131 have an end fixed to the interconnection piece 19, here the second face 19B, and a free end intended to bear against the heating element 7a, 7b. Further, the first connector 21 includes ends of the first electrical contacts 25a, 25b, 25c, 25d extending from the first face 19A of the interconnection piece 19 to the electrical circuit board holder 13. According to the embodiment illustrated in FIGS. 8 and 9, two first electrical contacts 25a, 25c, respectively contacting a connection surface 16a of an associated heating element 7a, 7b may have a respective end 133a, 133c extending towards the 13. The two other first electrical contacts 25b, 25d, respectively contacting the other connection surface 16b of the heating elements 7a, 7b associated 5 may have the same end 134. The electrical circuit card support 13 is crossed by the ends 133a, 133c, 134 of the electrical contacts 25a, 25b, 25c, 25d of the first connector 21. The second connector 22 comprises meanwhile ends of the second electrical contacts 27a, 27b, 27c, 27d extending from the first face 19A of the interconnection piece 19 towards the electrical circuit board support 13. According to the embodiment illustrated in FIGS. 9, two second electrical contacts 27a, 27c, respectively contacting a connecting surface 15a of a heating element 7a, 7b associated may have the same end 137.

The other two second electrical contacts 27b, 27d, respectively contacting the other connection surface 15b of the associated heating elements 7a, 7b may have a respective end 139b, 139d extending towards the electrical circuit card holder 13. Of course the number of ends of the first and / or second electrical contacts 25a to 25d and 27a to 27d extending towards the electrical circuit board support 13 may be adapted as required. In addition, the interconnection piece 19 may have at least one projection 41 forming one or more ends of the first and / or second electrical contacts 25a to 25d, 27a to 27d. In the example of Figure 4, the interconnection piece 19 has two projections 41. The two projections 41 may be arranged opposite on two side edges of the interconnection piece 19. Each projection 41 carries for example the two ends 33 respective two first electrical contacts 25a, 25c or 25b, 25d and two ends 35 of two second electrical contacts 27a, 27c or 27b, 27d. According to the embodiment illustrated in FIGS. 6 to 9, a first projection 41 carries, for example, the two ends 133 of two first electrical contacts 25a, 25c and one end 137 of two second electrical contacts 27a, 27c, and one second projection 41 carries for example a common end 134 of two first electrical contacts 25b, 25d and the two respective ends 13b, 139d of the two second electrical contacts 27b, 27d. Thus, the electrical connection between each heating element 7a, 7b and the electrical circuit board support 13 is ensured in particular by the mechanical maintenance of the contact between the electrical connectors 21, 22 connected to each heating element 7a, 7b and the card support. electrical circuit 13 by the interconnection plate 19. The interconnection plate 19 is fixed on one side of the electrical circuit support 13 vis-à-vis the heating element 7a, 7b. The two heating elements 7a and 7b can be assembled to the electrical circuit card holder 13, mechanically and electrically by a common interconnection plate 19. The interconnection plate 19 enables the electrical contacts 25a, 25b, 25c, 25d, 27a, 27b, 27c, 27d to be pressed and secured to contact areas of the electrical circuit support 13. The interconnection plate 19 thus provides the mechanical holding and the electrical contact between the electrical contacts 25a, 25b, 25c, 25d, 27a, 27b, 27c, 27d and the electrical circuit support 13. In addition, the assembly of the interconnection plate 19 with the The heating elements 7a, 7b and the electrical circuit board holder 13 mechanically hold the contact blades 29, 31, 129, 131 against the serigraphed tracks 8 of the heating elements 7a, 7b. It is understood that the electrical connection and the mechanical connection of the heating device are made in a simple and reliable way by means of an interconnection plate 19 as described previously and which can be common for the two heating elements 7a and 7b.

Claims (13)

REVENDICATIONS1. An electric fluid heater for a motor vehicle, comprising: at least one heating element (7a, 7b), and control means (3) for the heating element (7a, 7b) having an electrical circuit card holder ( 13), characterized in that said device further comprises an electrical connection (17) electrically connecting the heating element (7a, 7b) to the electrical circuit board support (13), said electrical connection comprising at least one piece of interconnection (19) adapted to be assembled with the heating element (7a, 7b) and carrying at least two electrical connectors (21, 22) electrically connected on the one hand to the associated heating element (7a, 7b) and to on the other hand to the circuit board support (13). 2. Heating device according to claim 1, wherein the interconnection piece (19) is removable. Heating device according to one of the preceding claims, wherein the electrical connection (17) comprises at least a first electrical connector (21) for feeding the heating element (7a, 7b), and at least one second electrical connector (22) for transmitting an information signal of the temperature of the heating element (7a, 7b). A heater as claimed in any one of the preceding claims, wherein said electrical connectors (21,22) respectively have at least one contact blade (29,31; 129; 131) configured to contact an electrical connection surface ( 15a, 15b, 16a, 16b) of the heating element (7a, 7b). 5. Heating device according to any one of the preceding claims, wherein said electrical connectors (21, 22) respectively have electrical contacts (25a, 25b, 25c, 25d, 27a, 27b, 27c, 27d) whose ends ( 33, 35; 133a, 133c, 134, 137, 139b, 139d) pass through the electrical circuit board holder (13). 6. Heating device according to one of the preceding claims, wherein the electrical connection (17) comprises at least one mechanical holding means configured to mechanically hold said electrical connectors (21, 22) against the heating element ( 7a, 7b), by mechanical cooperation between the interconnection piece (19) and the heating element (7a, 7b). 7. Heating device according to any one of the preceding claims, wherein the heating element (7a, 7b) has a substantially cylindrical shape and the interconnection plate (19) has a connection surface (23) substantially conforming to the less partially the cylindrical periphery of the heating element (7a, 7b). 8. Heating device according to the preceding claim, wherein the interconnection plate (19) has at least one opening (23) substantially annular adapted to receive the heating element (7a, 7b) associated. Heating device according to one of the preceding claims, wherein the interconnection plate (19) is assembled on one side of the electrical circuit support (13) opposite the heating element (7a). , 7b). 10. Heating device according to any one of the preceding claims, wherein the heating element (7a; 7b) comprises at least one heating resistor produced by screen printing in the form of a resistive track (8). 11. Heating device according to any one of the preceding claims, comprising two heating elements (7a, 7b) and the electrical connection (17) comprises a common interconnection piece (19) electrically connecting the two heating elements (7a, 7b). ) to the electrical circuit board support (13). 12. Heating device according to the preceding claim, wherein the heating elements (7a, 7b) are arranged side by side. 13. Heating circuit of a vehicle interior, characterized in that it comprises a heating device (1) according to any one of the preceding claims.