FR3053205A1 - ELECTRIC ADDITIONAL HEATING DEVICE AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

The present invention relates to an additional electric heating device (1) for heating a flow of air passing through including a duct of a ventilation system, heating and / or air conditioning of a motor vehicle, the additional heating device (1) comprising at least one heating module (4), extending longitudinally, the additional heating device (1) also comprising, overmolded at the ends of the heating module or modules (4): • an electrical connection interface (31) which allows the connection of the heating module or modules (4) to a power source of the vehicle, • a heel (32), opposite to the connection interface (31).

Description

The invention relates to an additional electric heating device for a motor vehicle as well as to the method of manufacturing said heating device. More particularly, the invention relates to an electric additional heating device integrated in a ventilation system, heating and / or air conditioning of a motor vehicle.

The additional electrical heating devices generally comprise a housing in which at least one heating module is inserted. The housing comprises: an electrical connection interface that allows the connection of the heating module (s) to a power source of the vehicle, a heel, opposite to the connection interface, at least two sleepers connecting the interface connection and the heel, and • at least one intermediate amount connecting the longitudinal cross members. The connection interface, the heel and the two cross members frame the heating module (s). The intermediate amount (s) hold the heating module (s) within the frame formed by the connection interface, the heel and the crosspieces. However, said intermediate amounts are placed in the flow of air passing through the heating modules and therefore, they impede the flow of air flow and therefore can reduce the efficiency of the additional heating device.

In addition, in the method of manufacturing such an additional heating device, the housing is manufactured beforehand and the heating modules are then inserted inside said housing, in particular by the heel. This involves incorporating into the housing devices for fixing and holding the heating modules, which can increase production costs.

One of the aims of the present invention is therefore to at least partially overcome the disadvantages of the prior art and to provide an improved additional heating device, as well as its manufacturing process.

The present invention therefore relates to an additional electrical heating device for heating a flow of air passing through a duct of a ventilation system, heating and / or air conditioning of a motor vehicle, the additional heating device having the minus a heating module, extending longitudinally, the additional heating device also comprising, overmolded at the ends of the heating module or modules: an electrical connection interface which allows the connection of the heating module or modules to a power supply source of the vehicle, • a stub, opposite the connection interface.

The fact that the connection interface and the bead are overmoulded at the ends of the heating module or modules allows a saving of time in the manufacture of the additional heating device because these two elements are directly overmoulded on the heating module or modules. In addition, this allows good cohesion and good maintenance of the heating modules.

According to one aspect of the invention, the additional heating device comprises at least one cross member connecting the connection interface and the heel.

Because the elements forming the housing are overmolded around the heating module or modules, it is not necessary to have intermediate amounts connecting the cross members and which could impede the flow of air flow through the or the heating modules. In addition, since the heating module or modules are overmolded, it is no longer necessary to provide means for fixing said heating modules within the housing or with the connection interface and the heel.

According to another aspect of the invention, a heating module comprises: at least two conductive assemblies formed of a conductive electrode longitudinally extended by an electrode free end, said free electrode end being able to be connected to the power source of the vehicle at the connection interface, a holding plate, and an insert sandwiched and held between the conducting electrode and the holding plate, at least one effect ceramic of positive temperature coefficient, said at least one ceramic being sandwiched between two conductive assemblies, said conductive assemblies also being extended, opposite to the free ends of the electrode, by holding appendages, able to be overmolded within heel.

These holding appendices allow in particular a good grip overmoulding around the heating module or modules and allow the maintenance of said heating modules.

According to another aspect of the invention, the holding appendages are an extension of the conductive electrodes.

According to another aspect of the invention, the holding appendages are an extension of the holding plates.

According to another aspect of the invention, the holding appendages are inclined relative to the planes of the conductive electrodes of an angle greater than 0 ° and less than or equal to 90 °.

This inclination of the holding appendices makes it possible to limit the thickness of the heel so that it completely encompasses the said holding appendages. It is thus possible to obtain a relatively thin heel and thus requiring less material and thus more economical.

According to another aspect of the invention, the free ends of electrodes (420) have protrusions protruding from their surface.

According to another aspect of the invention, the free ends of electrodes comprise connectors able to receive power cables configured to be electrically connected to the vehicle's electrical power source and said free ends of electrodes and said connectors. are overmolded in the electrical connection interface.

According to another aspect of the invention, the connectors comprise projections protruding from their surface.

These excrescences facilitate overmolding and maintaining the connectors.

According to another aspect of the invention, the free ends of electrodes, the connectors and the ends of the power cables are overmolded in the connection interface.

The electrical connection between the power cables and the free ends of the electrodes via the connectors is then protected within the connection interface itself.

According to another aspect of the invention, the free ends of electrodes comprise connection terminals and said connection terminals are overmolded in the electrical connection interface.

According to another aspect of the invention, the connection terminals comprise projections protruding from their surface.

According to another aspect of the invention, the outer cross or bolsters comprise deflectors obstructing the flow of air flow on the sides of said additional heating device.

These deflectors make it possible to increase and regulate the pressure losses within the conduit of the ventilation, heating and / or air-conditioning system of a motor vehicle, so as to redirect the flow of air so that it passes through the or the heating modules.

According to another aspect of the invention, the connection interface comprises a housing inside which is disposed an electronic device for managing and supplying the heating module or modules.

According to another aspect of the invention, the electronic device for managing and supplying the heating module or modules is molded into the connection interface.

According to another aspect of the invention, overmolding is a multi-injection overmoulding.

According to another aspect of the invention, the electrical connection interface is made of a plastic material that is more resistant to heat than the heel and / or the cross member (s).

The present invention also relates to a method of manufacturing an additional electric heating device for heating a flow of air passing through including a duct of a ventilation system, heating and / or air conditioning of a motor vehicle, said manufacturing method comprising the following steps: • supply of at least one heating module, • placement of the at least one heating module longitudinally within a mold, • overmolding at the ends of the heating module (s): electrical connection interface that allows the connection or the heating modules to a power source of the vehicle, and ° a heel, opposite the connection interface.

The fact that the connection interface and the bead are overmoulded at the ends of the heating module or modules allows a saving of time in the manufacture of the additional heating device because these two elements are directly overmoulded on the heating module or modules. In addition it allows a good cohesion and good maintenance of the heating modules.

This manufacturing method makes it possible in particular to group the manufacture of the connection interface and the heel with the mounting within the heating module or modules. Instead of having two separate manufacturing and assembly stages, everything is grouped into one more economical step. In addition, since the heating module or modules are overmolded, it is no longer necessary to provide means for fixing said heating modules in a previously manufactured housing.

According to another aspect of the manufacturing method according to the invention, the overmolding step may also comprise the overmolding of at least one cross member connecting the connection interface and the heel.

According to another aspect of the manufacturing method according to the invention, the heating module or modules comprise: at least two conductive assemblies, formed: a conductive electrode longitudinally extended by an electrode free end, said free end of electrode being adapted to be connected to the electrical source of the vehicle at the electrical connection interface, ° a holding plate, and ° an insert sandwiched and held between the conductive electrode and the holding plate, at least one ceramic having a positive temperature coefficient effect, said at least one ceramic being sandwiched between two conductive assemblies, said conductive assemblies being also extended, opposite the electrode free ends, by holding appendages, and the overmolding step further allowing overmolding said appendages holding in the heel.

According to another aspect of the manufacturing method according to the invention, said manufacturing method comprises, prior to the overmolding step, a step of twisting the holding appendages so that said holding appendages are inclined relative to the planes of the electrodes conductors greater than 0 ° and less than or equal to 90 °.

According to one aspect of the manufacturing method according to the invention, during the overmoulding step, a housing is formed in the connection interface and said method comprises, after the overmoulding step, a step of setting up the an electronic device for managing and supplying the heating module or modules in said housing.

According to one aspect of the manufacturing method according to the invention, during the overmolding step, an electronic device for managing and feeding the heating module or modules is molded into a housing in the connection interface.

According to one aspect of the manufacturing method according to the invention, the overmolding step is a multi-injection overmolding step.

According to one aspect of the manufacturing method according to the invention, during the multi-injection overmolding step, the connection interface is made of a plastic material that is more resistant to heat than the heel and the crossmember (s). Other features and advantages of the invention will appear more clearly on reading the following description, given by way of illustrative and nonlimiting example, and the appended drawings in which: FIGS. 1 and 1 'show a diagrammatic representation of an additional heating device according to two embodiments, FIGS. 2a and 2b show schematic representations of a heating module according to a first embodiment, FIG. 2c shows a schematic representation of a heating module according to a second embodiment of FIG. 3 shows a schematic representation of an end of a heating module, FIGS. 4 and 5 show schematic representations of additional heating devices according to different embodiments. FIG. 6 shows a schematic representation of free ends of electrodes according to a first variant, FIGS. 7a and 7b show schematic representations of free ends of electrodes according to a second variant, FIG. 8 shows a schematic representation of ends. free of electrodes according to a third variant.

The identical elements in the different figures bear the same references.

The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined and / or interchanged to provide other embodiments.

In the present description, it is possible to index certain elements or parameters, for example first element or second element as well as first parameter and second parameter, or first criterion and second criterion, and so on. In this case, it is a simple indexing to differentiate and name elements or parameters or criteria close but not identical. This indexing does not imply a priority of one element, parameter or criterion with respect to another, and it is easy to interchange such denominations without departing from the scope of the present description. This indexing does not imply either an order in time for example to appreciate such or such criteria.

FIG. 1 shows a schematic representation of an additional electric heating device 1 for heating a flow of air passing through in particular a duct of a ventilation, heating and / or air-conditioning system of a motor vehicle or HVAC ( acronym for English Heating, Ventilation and Air-Conditioning).

The additional heating device 1 comprises at least one heating module 4 which extends longitudinally. The additional heating device 1 also comprises, overmolded at the ends of the heating module or modules 4: • an electrical connection interface 31 which allows the connection of the heating module or modules 4 to a vehicle power source, said connection interface 31 may for example comprise a skirt 310 inside which are placed electrode free ends 420 of the heating modules 4, so as to electrically supply said heating modules in the connected state, and • a heel 32, opposite to the connection interface 31, said heel may comprise pins 320 for positioning the additional heating device 1 within the conduit of the HVAC.

The fact that the connection interface 31 and the heel 32 are overmolded at the ends of the heating module or modules allows a saving of time in the manufacture of the additional heating device 1 because these two elements are directly on the heating module or modules 4. In addition it allows a good cohesion and good maintenance of the heating modules 4.

As shown in Figure 1 ', the connection interface 31 and the heel 32 may be interconnected by at least one cross member 33 also overmolded. The additional heating device 1 may comprise at least two so-called external crosspieces 33, that is to say situated on the periphery of said additional heating device 1 and which, in combination with the connection interface 31 and the heel 32, frame or heating modules 4 so as to form a housing 3.

Because the elements forming the housing 3 are overmoulded around the heating module or modules 4, it is not necessary to have intermediate amounts connecting the cross members 33 and which could hinder the flow of an air flow through the heating module (s) 4. In addition, since the heating module (s) 4 are overmolded, it is no longer necessary to provide means for fixing said heating modules 4 within the housing 3 or with the connection interface 31. and the heel 32.

Overmoulding may be more particularly a multi-injection overmoulding. Thus, the various overmolded elements can be made of different plastics, adapted to the constraints they undergo. In particular, the electrical connection interface 31 may be made of a plastic material that is more heat-resistant than the heel 32 and / or the cross-members 33. Indeed, the connection interface 31 being the place where the electrical connections are achieved, this is the area that can experience the highest temperatures. Thus, the connection interface 31 may be made of polybutylene terephthalate (PBT) or polyamide (PA), for example filled with fiberglass, and the heel 32 and / or the cross-member (s) 33 may be made of polypropylene (PP), less heat resistant.

As illustrated in FIGS. 2a to 2c, a heating module 4 comprises: at least two conductive assemblies 4a, 4b formed of a conductive electrode 42 extended longitudinally by an electrode free end 420, said free electrode end 420 being able to be connected to the vehicle power source at the connection interface 31, a holding plate 43 can be made of a metal material such as aluminum for example, and a spacer 44 sandwiched and held between the conductive electrode 42 and the holding plate 43, said spacer 44 may in particular be a metal band folded accordion and placed between the conductive electrode 42 and the holding plate 43 so that a flow air can pass through said spacer 44, at least one ceramic 45 with a positive temperature coefficient effect CTP, said at least one ceramic 45 being taken into account. ndwich between two conductive assemblies 4a, 4b.

In a first embodiment of a heating module 4, illustrated in Figures 2a and 2b, said heating module 4 comprises two conductive assemblies 4a and 4b superimposed and between which are placed ceramics 45 CTP. In the case illustrated in FIGS. 2a and 2b, there are four ceramics 45 CTP, but this number may vary in particular as a function of the length of the heating module 4. The longer a heating module 4, the greater the number of 45 CTP ceramics required. will be large, and conversely, plus a heating module 4 will be short, the more the number of ceramic 45 CTP needed will be small.

In this first embodiment of the heating module 4, said heating module 4 then comprises two electrode free ends 420, a first free electrode end 420 being able to be connected to a positive power supply terminal and a second end free electrode 420 being adapted to be connected to a negative power supply terminal.

In a second embodiment of the heating module 4 illustrated in Figure 2c, said heating module 4 comprises three conductive assemblies 4a, 4b and 4c superimposed and between which are placed ceramics 45 CTP. In the case illustrated in FIG. 2c, there are four ceramics 45 CTP, but this number may vary in particular as a function of the length of the heating module 2.

In this second embodiment of the heating module 4, said heating module 4 then comprises three electrode free ends 420, two free ends of electrodes 420 being able to be connected to a positive power supply terminal, in particular the free ends. of electrodes 420 of the conductive assemblies 4a and 4b placed at the periphery of the superposition of the conductive assemblies 4a, 4b and 4c, and an electrode free end 420 being able to be connected to a negative power supply terminal, in particular the free electrode end 420 of the conductive assembly 4c placed in the center of the superposition of the conductive assemblies 4a, 4b and 4c.

The additional heating devices 1 illustrated in FIGS. 4, 4 and 5, both comprise heating modules 4. They more particularly comprise a first heating module 4 according to the first embodiment described above and a second heating module 4 according to the second embodiment described above. These two heating modules 4 are separated from each other by a crossbar 33 called internal. It is nevertheless conceivable to imagine, without departing from the scope of the invention, an additional heating device 1 comprising fewer or more heating modules 4, according to any embodiment of said heating modules 4.

The conductive assemblies 4a, 4b are also extended, opposite the free ends of the electrode 420, by holding appendages 46, able to be overmolded within the heel 32. These holding appendices 46 allow in particular a good grip of the overmoulding of the heel 32 at the end of the heating module or modules 4 and allow the maintenance of said heating modules 4 sets.

The holding appendages 46 may be an extension of the conductive electrodes 42, as illustrated in Figures 2a and 2b, or said holding appendages 46 may be an extension of the holding plates 43, as shown in Figure 2c.

In addition, as shown in particular in Figure 3, the holding appendices 46 may be inclined relative to the planes of the conductive electrodes 42 of an angle greater than 0 ° and less than or equal to 90 °. This inclination makes it possible to limit the thickness of the heel 32 so that it completely encloses said holding appendages 46. It is thus possible to obtain a relatively thin heel 32 and thus requiring less material and thus more economical. These holding appendices 46 may be planar, as illustrated in the various figures, but it is quite possible without departing from the scope of the invention to imagine holding appendices 46 having a particular shape such as a curve or twisted.

As illustrated in FIGS. 4 and 5, the additional heating device 1 may also include baffles 330 on the external crosspieces 33, that is to say the crosspieces 33 located on the periphery of said additional heating device 1. These deflectors 330 , overmoulded at the same time as the crosspieces 33, make it possible to increase and regulate the pressure losses within the HVAC duct, so as to redirect the flow of air so that it passes through the heating module (s). deflectors 330 may also include openings 331 whose number and size, decided upon overmoulding sleepers 33, is variable according to the pressure drop needs.

As illustrated in FIG. 5, the connection interface 31 may comprise a housing 311, made of material with said connection interface 31, inside which is disposed an electronic device 312 for managing and feeding the module or modules 4. This electronic management device 312 and power supply can be overmolded directly in the connection interface 31 or be positioned a posteriori.

As shown in FIG. 6, the electrode free ends 420 may include protuberances 422 protruding from their surface to facilitate their overmolding within the connection interface 31.

According to a first variant illustrated in FIGS. 7a and 7b, the electrode free ends 420 may comprise connectors 421 capable of receiving power cables 424. The power supply cables 424 are fixed to the connectors 421 by clamping means 423. , formed for example of one or more metal strips folded over the cable to crimp it. These power cables 424 are configured to be electrically connected to the power source of the vehicle. The electrode free ends 420 and said connectors 421 may in particular be overmoulded and encompassed in the connection interface 31. In order to facilitate the overmolding and the holding of said connectors 421, these connectors may also include protuberances 422 projecting from their area.

It is also quite possible to imagine that the electrode free ends 420, the connectors 421 and the ends of the power cables 424 are overmolded in the connection interface 31. The electrical connection between the cables supply 424 and the free ends of electrodes 420 via connectors 421 is then protected within connection interface 31 itself.

According to a second variant illustrated in FIG. 8, the free ends of electrodes 420 may comprise connection terminals 425. These connection terminals 425 make it possible to interface the free ends of electrodes 420 with the connectors 421. Indeed, depending on the type of heating module 4, the free ends of electrodes 420 may be very thin and not suitable for directly receiving the connectors 421.

The electrode free ends 420 and said connection terminals 425 may in particular be overmoulded and encompassed in the connection interface 31, with or without the connectors 421. To facilitate overmolding and maintenance of said connection terminals 425, the latter may also include protrusions 422 protruding from their surface.

The present invention also relates to a method of manufacturing an additional electric heating device 1 as described above, for heating a flow of air passing through including a duct of a ventilation, heating and / or air conditioning system. 'a motor vehicle.

This manufacturing method comprises the following steps: • supply of at least one heating module 4, • installation of the at least one heating module 4 longitudinally within a mold, • overmoulding at the ends of the heating module (s) 4: An electrical connection interface 31 which allows the connection of the heating module or modules 4 to a power supply source of the vehicle, and of a heel 32, opposite to the connection interface 31 and allowing the connection with the conduit of a ventilation, heating and / or air conditioning of a motor vehicle. The overmolding step may also comprise an overmoulding of at least one crossmember 33 connecting the connection interface 31 and the heel 33.

This manufacturing method makes it possible in particular to group together the manufacture of the connection interface 31 and the heel 32 with the mounting of the heating module or modules 4. Instead of having two distinct manufacturing and assembly stages, everything is grouped into one. single step more economical. In addition, since the heating module (s) 4 are overmoulded, it is no longer necessary to provide means for fixing said heating modules 4 in a previously manufactured housing.

As shown above, the overmoulding step may be a multi-injection overmolding step. Thus, during the multi-injection overmolding step, the connection interface 31 can be made of a plastic material that is more heat-resistant than the heel 32 and / or the crossmember (s) 33.

Similarly, the conductive assemblies 4a, 4b of a heating module 4 can be extended, opposite the free ends of the electrode 420, by holding appendices 46. Then, the overmolding step makes it possible to encompass said holding appendages 46 in the heel 32 for a better cohesion and strength of the additional heating device 1.

The manufacturing process of the additional electric heating device 1 may include, prior to the overmolding step, a step of twisting the holding appendages 46 so that said holding appendices 46 are inclined relative to the planes of the conductive electrodes 42 d an angle greater than 0 ° and less than or equal to 90 °. As indicated above, this inclination makes it possible to limit the thickness of the heel 32 so that it completely encompasses said holding appendages 46. It is thus possible to obtain a heel 32 that is relatively thin and therefore requires less material and is more economical.

According to a particular embodiment of the manufacturing method, during the overmolding step, a housing 311 can be made in the connection interface 31. In addition, after the overmolding step, the manufacturing process can comprise a step of setting up an electronic device 312 for managing and supplying the heating module or modules 4 in said housing 311.

According to another particular embodiment of the manufacturing method, during the overmolding step, an electronic device 312 for managing and supplying the heating module (s) 4 may be molded into a housing 311 in the connection interface. 31.

Thus, it is clear that the additional heating device 1 according to the invention, because the connection interface 31, the heel 32, and the cross or 33 are overmolded around the heating module or modules 4, allows a better circulation of the air flow within the one or more heating modules 4, because of the absence of intermediate amounts. In addition, the additional heating device 1 according to the invention is simpler and more economical to manufacture.

Claims (19)

1. Additional electric heating device (1) for heating a flow of air passing through including a duct of a ventilation system, heating and / or air conditioning of a motor vehicle, the additional heating device (1) comprising at least one heating module (4), extending longitudinally, characterized in that the additional heating device (1) also comprises, overmolded at the ends of the heating module or modules (4): • a connection interface (31) electrical connection that allows the connection or the heating modules (4) to a power source of the vehicle, • a heel (32), opposite the connection interface (31). 2. Additional electric heating device (1) according to the preceding claim, characterized in that it comprises at least one cross member (33) connecting the connection interface (31) and the heel (32). 3. Additional electric heating device (1) according to one of the preceding claims, characterized in that a heating module (4) comprises: • at least two conductive assemblies (4a, 4b), formed: ° of an electrode conductive member (42) longitudinally extended by an electrode free end (420), said electrode free end (420) being adapted to be connected to the vehicle power source at the connection interface (31). ), A holding plate (43), and a spacer (44) sandwiched and held between the conductive electrode (42) and the holding plate (43), • at least one ceramic (45) having an effect positive temperature coefficient (PTC), said at least one ceramic (45) being sandwiched between two conductive assemblies (4a, 4b), said conductive assemblies (4a, 4b) being also extended, opposite the free ends electrode (420), by hand appendages tien (46), able to be overmoulded within the heel (32). 4. Additional electric heating device (1) according to claim 3, characterized in that the holding appendices (46) are an extension of the conductive electrodes (42). 5. Additional electric heating device (1) according to claim 3, characterized in that the holding appendices (46) are an extension of the holding plates (43). 6. Additional electric heating device (1) according to one of claims 3 to 5, characterized in that the holding appendices (46) are inclined relative to the planes of the conductive electrodes (42) by an angle greater than 0 ° and less than or equal to 90 °. 7. Additional electric heating device (1) according to one of claims 3 to 6, characterized in that the free ends of electrodes (420) have protrusions (422) projecting from their surface. 8. Additional electric heating device (1) according to one of claims 3 to 7, characterized in that the free ends of electrodes (420) comprise connectors (421) able to receive power cables (424). configured to be electrically connected to the vehicle power source and said electrode free ends (420) and said connectors (421) are overmolded in the electrical connection interface (31). 9. Additional electric heating device (1) according to the preceding claim, characterized in that the connectors (421) comprise protrusions (422) projecting from their surface. 10. Additional electrical heating device (1) according to one of claims 8 or 9, characterized in that the free ends of electrodes (420), the connectors (421) and the ends of the power cables (424) are overmolded in the connection interface (31). 11. Additional electric heating device (1) according to one of claims 3 to 10, characterized in that the free ends of electrodes (420) comprise connection terminals (425) and said connection terminals (425). are overmolded in the electrical connection interface (31). 12. Additional electrical heating device (1) according to the preceding claim, characterized in that the connection terminals (425) comprise protrusions (422) projecting from their surface. 13. Additional electric heating device (1) according to one of claims 2 to 12, characterized in that the or the cross (33) external comprise baffles (330) obstructing the flow of an air flow on the sides of said additional heating device (1). 14. Additional electric heating device (1) according to one of the preceding claims, characterized in that the connection interface (31) comprises a housing (311) inside which is disposed an electronic device (312) of management and supply of the heating module (s) (4). 15. Additional electric heating device (1) according to the preceding claim, characterized in that the electronic device (312) for managing and supplying the heating module or modules (4) is overmolded in the connection interface (31). . 16. Additional electric heating device (1) according to one of the preceding claims, characterized in that the overmolding is a multi-injection overmoulding. 17. Additional electric heating device (1) according to claims 2 and 16, characterized in that the electrical connection interface (31) is made of a plastic material more heat-resistant than the heel (32) and / or the sleepers (33). 18. A method of manufacturing an additional electric heating device (1) for heating a flow of air passing through including a duct of a ventilation system, heating and / or air conditioning of a motor vehicle, said method manufacturing method comprising the following steps: • provision of at least one heating module (4), • installation of the at least one heating module (4) longitudinally within a mold, • overmoulding at the ends of the heating module (s) (4): ° an electrical connection interface (31) which allows the connection of the heating module (s) (4) to a power source of the vehicle, and ° a heel (32), opposite to the electrical connection interface (31). 19. A method of manufacturing an additional electric heating device (1) according to the preceding claim, characterized in that the overmolding step may also include overmolding at least one cross member (33) connecting the connection interface. (31) and the heel (32).