Heating element for a fluid heating device

Abstract

Title: Heating Element for a Fluid Heating Device. The invention relates to a heating element (2) for a fluid heating device (4). Said heating element comprises: - a casing (6); - a support (8) around which at least one heating wire (10) is wound so as to form a wound support (12), said wound support being located at least partially inside the casing (6); - a thermal fuse (14), located inside the casing (6) and electrically connected to the heating wire (10), said thermal fuse being intended to interrupt the flow of electric current (70) in said heating wire 10 when the thermal fuse (14) is subjected to a temperature that reaches a predetermined threshold; and the casing (6) having an inner face (11) oriented towards an electrically insulating and thermally conductive material (34) enclosing the heating wire (10) and an outer face (13) oriented towards the fluid.Figure for the summary: Fig. 2.

Description

Title of the invention: Heating element for a fluid heating device

[0001] The field of the present invention relates to a heating element for a device for heating a fluid, in particular a heat transfer fluid. The present invention also relates to a fluid heating device comprising such a heating element.

[0002] A fluid heating device, particularly for vehicles, typically comprises heat exchangers that heat the airflow intended for temperature regulation, especially in vehicle passenger compartments. It is known to circulate a fluid, particularly a heat transfer fluid, through these heat exchangers to transfer the heat generated by the exchanger to the airflow.

[0003] The term "vehicles" refers to maritime, land and air vehicles. In particular, motor vehicles, and especially vehicles powered by an electric or hybrid propulsion engine.

[0004] It is also known to add a fluid heater to the heat exchanger.

[0005] The fluid heater is supplied with electrical current by a high-voltage network capable of delivering heating powers of the order of 2 to 10 kW. The heater can advantageously be controlled by a dedicated control circuit, said circuit comprising, for example, insulated-gate bipolar transistors.

[0006] In the event of a control circuit failure, the heating element may continue to heat even after the fluid, particularly the heat transfer fluid, has reached the desired temperature. Worse still, due to the failure, the heating element may continue to heat even when the fluid is no longer circulating. This can cause serious damage, such as fluid overheating, boiling, or an explosion of the heater.

[0007] The invention aims to overcome these aforementioned drawbacks, in particular to protect said heating device from overheating, boiling of the fluid or explosion of the heater.

[0008] The invention thus relates to a heating element for a device for heating a fluid, in particular a heat transfer fluid, particularly for a motor vehicle, said heating element comprising:

[0009] - an envelope;

[0010] - a support around which at least one heating wire is wound so as to form a wound support, said wound support being placed at least partially inside the envelope;

[0011] - a thermal fuse, located inside the casing and electrically connected to the heating wire, said thermal fuse being intended to interrupt the flow of electric current in said heating wire when the thermal fuse is subjected to a temperature that reaches a predetermined threshold; and

[0012] the envelope having an inner face oriented towards an electrically insulating and thermally conductive material encasing the heating wire and an outer face oriented towards the fluid.

[0013] Thanks to the invention, the heat produced by the heating wire is transferred to the thermal fuse by conduction. Thus, when there is overheating from the heating wire,

[0014] The thermal fuse is subjected to a temperature that reaches a predetermined threshold so as to interrupt the flow of electric current in the heating wire. When the thermal fuse is exposed to an excess of electric current, the thermal fuse also melts so as to interrupt the flow of electric current in the heating wire.

[0015] Furthermore, the fact that the thermal fuse is located inside the casing protects it from potential damage during the assembly of the heating element in a heating device. In addition, this clever positioning of the thermal fuse inside the casing reduces the overall size of the heating device.

[0016] In addition, the electrically insulating and thermally conductive material coating the heating wire protects the heating wire from any possible fluid leakage from the outer face of the casing, while ensuring thermal conduction between the outer face of the casing and the heating wire.

[0017] In summary, the invention makes it possible to protect the heating device of a fluid from overheating, while also improving the robustness of the assembly of the heating device, and reducing its overall size.

[0018] According to one aspect of the invention, the casing is open at one end and closed at the opposite end by a base. The casing includes a lateral area that connects the edges of the closed base to the edges of an open end.

[0019] According to one aspect of the invention, the open end of the envelope is arranged to receive the wound support.

[0020] According to one aspect of the invention, the envelope has a general shape of a cylinder, preferably a general shape of a cylinder of revolution, open at one end and closed at the other opposite end by a base.

[0021] According to one aspect of the invention, the base of the casing serves as a stop for the wound support. The electrically insulating and thermally conductive material is interposed between the lateral area of ​​the casing and the outer face of the wound support.

[0022] According to one aspect of the invention, the thermal fuse is located inside the wound support.

[0023] According to one aspect of the invention, the wound support is hollow, so as to form at least partially a dead volume inside the wound support.

[0024] In one embodiment, the thermal fuse is positioned on the inner face of the wound support, the inner face being an opposite face to the outer face of the support around which the heating wire is wound and oriented towards the electrically insulating and thermally conductive material.

[0025] For example, the outer face and the inner face are respectively located on opposite faces of the lateral area of ​​the envelope.

[0026] According to one aspect of the invention, the electrically insulating and thermally conductive material on the external face of the wound support comprises mica, magnesia (MgO), and / or electrically insulating and thermally conductive ceramic.

[0027] Alternatively, the inside of the wound support is at least partially filled with an electrically insulating and thermally conductive material, for example an electrically insulating and thermally conductive ceramic.

[0028] Alternatively, the interior of the wound support is solid or completely filled with an electrically insulating and thermally conductive material, for example, an electrically insulating and thermally conductive ceramic. The electrically insulating and thermally conductive material advantageously comprises mica, magnesia (MgO), beryllium oxide (BeO), aluminum oxide (Al₂O₃), or a combination thereof.

[0029] Thus, the heat emitted from the heating wire on the outer face of the wound support can be transmitted to the inside of the wound support mainly by thermal conduction.

[0030] The "inside" of the wound support means the side of the inner face of the wound support, as opposed to the "outside" of the wound support, the side of the outer face around which the heating wire is wound.

[0031] According to one aspect of the invention, the thermal fuse is positioned centrally inside the wound support, in a radial arrangement.

[0032] According to one aspect of the invention, the heating element comprises: a support around which is wound at least one heating wire, with a regular pitch, the pitch being between 0.3 and 2 mm, preferably between 0.5 and 1 mm, so as to form a wound support, said wound support being placed at least partially inside the envelope.

[0033] In one embodiment of the invention, the casing has the general shape of a longitudinal tube. The tube has two parallel principal faces connected by rounded edges. The principal faces of the tube are substantially flat.

[0034] According to one aspect of the invention, the wound supports have a general shape of plates.

[0035] According to one aspect of the invention, the wound support(s) comprise at least one electrical connector arranged to be connected to a positive terminal or a negative terminal of an electrical power supply device.

[0036] According to one aspect of the invention, the wound support(s) comprise at one of its longitudinal ends at least one electrical connector arranged to be connected to a positive terminal or a negative terminal of an electrical power supply device.

[0037] According to one aspect of the invention, one of the wound supports includes the thermal fuse.

[0038] According to one aspect of the invention, the thermal fuse is arranged to be adjacent to an electrical connector which is arranged to be connected to a positive or negative terminal of a power supply device. Thus, manufacturing the heating element incorporating the thermal fuse is simpler, particularly for making an electrical connection, for example, an electrical solder joint, between the electrical connector and the thermal fuse.

[0039] According to one aspect of the invention, the thermal fuse is centrally arranged along the longitudinal direction of the wound support. Thus, the fact that the thermal fuse is centrally arranged allows for optimal heat transfer on both sides of the thermal fuse, and therefore for better responsiveness in the event of a malfunction of the heating element.

[0040] According to one aspect of the invention, the heating device includes a connecting wire configured to connect the heating wire of the heating element to an electrical power supply device.

[0041] According to one aspect of the invention, the heating element has an axis of symmetry S parallel to the longitudinal direction of the heating device and centered along the transverse direction of the heating device.

[0042] According to one aspect of the invention, the heating element comprises at least two wound supports.

[0043] According to one aspect of the invention, the heating element comprises at least two wound supports distributed on either side of the axis of symmetry S. In other words, these two wound supports are in axial symmetry along the axis of symmetry S.

[0044] According to one aspect of the invention, the heating element comprises a contiguous overheating prevention device, preferably contiguous along the direction transverse, to one of the wound supports, this overheating prevention device includes the thermal fuse, so that the heat emitted by the heating wire of the wound support can reach the thermal fuse of the overheating prevention device.

[0045] According to one aspect of the invention, the support or the wound support has a general shape of a plate.

[0046] The "longitudinal direction" of a heating element or heating device means the direction defined along its greatest length of the heating element or heating device.

[0047] In particular, the envelope is made of metal. For example, the envelope is made from a sheet of aluminum, in particular folded.

[0048] The invention also relates to a device for heating a fluid, in particular a heat transfer fluid, said heating device comprising a housing arranged to receive at least one heating element as described above.

[0049] According to one aspect of the invention, the heating device comprises at least one fluid inlet and outlet arranged to be connected to external fluid conduits.

[0050] According to one aspect of the invention, the heating device further comprises at least one fluid circulation channel configured to exchange heat with the external face of the casing.

[0051] According to one aspect of the invention, the fluid circulation channel is supplied by the fluid inlet and is connected to the fluid outlet.

[0052] According to one aspect of the invention, the heating device further comprises a housing arranged to receive the heating element's casing. The housing includes the fluid circulation channel formed by a space between the inner face of the housing and the casing, in particular the outer face of the casing.

[0053] According to one aspect of the invention, the heating element comprises a circuit including an electrical discharge component arranged in parallel with the thermal fuse, so as to discharge an excess of electrical current passing through the thermal fuse.

[0054] According to one aspect of the invention, the electrical discharge component comprises an electrical resistor. This electrical resistor includes an electrical wire having a resistance value Rr.

[0055] According to one aspect of the invention, when the electrical wire of the electrical resistance and the electrical wire of the thermal fuse are made of the same material, in particular metal, the cross-section of the electrical wire of the electrical resistance is less than that of the electrical wire of the thermal fuse.

[0056] Thus, in the parallel configuration of the circuit formed by the electrical resistor and the thermal fuse, the electric current passes preferentially through the thermal fuse, in particular through the electrical wire of the thermal fuse, having a lower resistance value than that of the resistance of the electrical wire of the electrical discharge component.

[0057] In fact, when the thermal fuse is no longer operational due to melting, resulting from its exposure to heat emitted by the heating wire or to an excess of electrical current passing through said thermal fuse, an electric arc can form across its terminals. The electrical discharge component thus prevents this phenomenon, which could cause serious damage to the heating device, or even a fire.

[0058] According to one aspect of the invention, the thermal fuse comprises an electrical wire having a resistance value Rf.

[0059] According to one aspect of the invention, the resistance value Rr of the electrical wire of the electrical resistor is higher than the resistance value Rf of the electrical wire of the thermal fuse.

[0060] When the thermal fuse melts due to a high electric current passing through it, the fuse's wire breaks, creating an open circuit across its terminals. This allows residual electric current to pass through the electrical discharge component, specifically through its wire. In this way, an electric arc is prevented across the open circuit of the thermal fuse.

[0061] After a short period of time, on the order of a few milliseconds, the electrical wire of the heating element breaks due to the passage of residual electrical current, thus forming an open circuit across the terminals of the heating element. In this way, following the break in the electrical wire of the heating element, the flow of electrical current in the heating wire is interrupted.

[0062] The circuit thus designed makes it possible, in two stages, to slow down or even stop the creation of an electric arc which may be caused at the terminals of the thermal fuse.

[0063] It can be foreseen that other types of thermal fuses other than those based on wire, such as thermal fuses based on solder, of thermosensitive polymer, can be used.

[0064] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and several illustrative and non-limiting examples of embodiments given with reference to the accompanying schematic drawings on the other hand, in which:

[0065] [Fig-1] The [Fig. 1] is a perspective representation of a heating element according to an alternative embodiment of the invention;

[0066] [Fig.2] Fig.2 is a schematic, cross-sectional representation of a device heating including the heating element of [Fig.1];

[0067] [Fig. 3] Fig. 3 is a schematic, cross-sectional representation of a device heating comprising the heating element according to another embodiment of the invention;

[0068] [Fig.4] Fig.4 is a schematic, perspective representation of an element heated according to another embodiment of the invention;

[0069] [Fig. 5] Fig. 5 is a schematic cross-sectional representation of the element heating of the [Fig.4];

[0070] [Fig.6] Fig.6 is a schematic, cross-sectional representation of the element heated according to another variant of the invention;

[0071] [Fig.7] Fig.7 is a schematic cross-sectional representation of the element heated according to another variant of the invention;

[0072] [Fig.8] Fig.8 is a schematic cross-sectional representation of the element heated according to another variant of the invention;

[0073] [Fig.9] Figure [Fig.9] schematically illustrates the normal operation of the configuration of a circuit including an electrical discharge component arranged in parallel with the thermal fuse;

[0074] [Fig. 10] The [Fig. 10] schematically illustrates the operation of the circuit following the exposure of the thermal fuse to the heat emitted by the heating wire or to an excess of electric current passing through said thermal fuse;

[0075] [Fig. 11] The [Fig. 11] schematically illustrates the operation of the circuit when the electrical wire of the resistor is broken following the passage of a residual electrical current.

[0076] The features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0077] Figures 1 to 8 show a heating element 2 for a heating device 4 of a heat transfer fluid for a motor vehicle (not shown).

[0078] Said heating element 2 comprises:

[0079] - a 6-piece metal envelope;

[0080] - a support 8 around which a heating wire 10 is wound, with a regular pitch, the pitch being between 0.3 and 2 mm, preferably between 0.5 and 1 mm, so as to form a wound support 12, said wound support being placed partially inside the envelope 6.

[0081] - a thermal fuse 14, located inside the casing 6 and electrically connected to the heating wire 10, said thermal fuse being intended to interrupt the flow of electric current 70 in said heating wire when the thermal fuse 14 is subjected to a temperature that reaches a predetermined threshold; and

[0082] the envelope 6 having an inner face 11 oriented towards an electrically insulating and thermally conductive material 34 enclosing the heating wire 10 and an outer face 13 oriented towards the heat transfer fluid.

[0083] Thanks to the invention, the heat produced by the heating wire 10 is transferred to the thermal fuse 14 by conduction. Thus, when there is overheating from the heating wire 10, the thermal fuse 14 is subjected to a temperature that reaches a predetermined threshold so as to interrupt the flow of electric current in the heating wire 10. When the thermal fuse 14 is exposed to an excess of electric current, the thermal fuse 14 also melts so as to interrupt the flow of electric current in the heating wire 10.

[0084] Furthermore, the fact that the thermal fuse 14 is located inside the casing 6 protects it from potential damage during the assembly of the heating element 2 in a heating device. In addition, this clever positioning of the thermal fuse 14 inside the casing 6 reduces the overall size of the heating device 4.

[0085] In addition, the electrically insulating and thermally conductive material 34 encasing the heating wire 10 protects the heating wire 10 from any possible fluid leakage from the outer face 13 of the casing 6, while ensuring thermal conduction between the outer face 13 of the casing 6 and the heating wire 10.

[0086] In summary, the invention makes it possible to protect the heating device 4 of a fluid from overheating, while also improving the robustness of the assembly of the heating device 4, and reducing its overall size.

[0087] The heating device 4 includes a connecting wire 16 configured to connect the heating wire 10 of the heating element 2 to a power supply device (not shown).

[0088] In the examples illustrated in Figures 2 and 3, a heating device 4 for a heat transfer fluid is shown. This heating device includes a housing 18 arranged to receive the heating element 2 as described above.

[0089] The heating device 4 has a fluid inlet 20 and a fluid outlet 22 arranged to be connected to external fluid conduits (not shown).

[0090] The heating device 4 includes a fluid circulation channel 24 configured to exchange heat with the external face 13 of the casing 6.

[0091] The fluid circulation channel 24 is supplied by the fluid inlet 20 and is connected to the fluid outlet 22.

[0092] The heating device 4 further comprises a housing 28 arranged to receive the casing 6 of the heating element 2. The housing 28 includes the fluid circulation channel 24 formed by spaces between the inner face of the housing 28 and the outer face 13 of the casing 6.

[0093] As can be seen particularly in Figures 1 to 3, the envelope 6 has a general shape of a cylinder of revolution, open at one end and closed at the opposite end by a base 30.

[0094] The envelope 6 includes a lateral area 32 which connects the edges of the closed base 30 to the edges of an open end 33. The open end 33 of the envelope 6 is arranged to receive the wound support 12.

[0095] The base 30 of the envelope 6 serves as a stop for the wound support 12. The electrically insulating and thermally conductive material 34 is interposed between the lateral area 32 of the envelope 6 and the external face of the wound support 12.

[0096] Figures 2 and 3 make it particularly visible that the thermal fuse 14 is located inside the wound support 12.

[0097] As illustrated in [Fig.2], the wound support 12 is hollow, so as to form at least partially a dead volume 36 inside the wound support 12.

[0098] Still in the example of [Fig.2], the thermal fuse 14 is positioned on the inner face of the wound support 12. The "inner face" is understood to be a face opposite to the "outer face" of the support 8 around which the heating wire 10 is wound and oriented towards the electrically insulating and thermally conductive material 34. The "inside" of the wound support 12 is understood to be on the side of the inner face of the wound support, as opposed to the "outside" of the wound support 12, on the side of the outer face around which the heating wire 10 is wound.

[0099] The external face 13 and the internal face 11 are respectively located on the opposite faces of the lateral area of ​​the envelope 6.

[0100] The electrically insulating and thermally conductive material 34 on the outer face 13 of the wound support 12 comprises mica, magnesia (MgO), and / or electrically insulating and thermally conductive ceramic.

[0101] As illustrated in [Fig. 3], the interior of the wound support 12 is solid or completely filled with the electrically insulating and thermally conductive material 34, for example, an electrically insulating and thermally conductive ceramic. The electrically insulating and thermally conductive material comprises advantageously mica, magnesia (MgO), beryllium oxide (BeO), aluminium oxide (Al2O3), or a combination thereof.

[0102] Thus, the heat emitted from the heating wire 10 on the outer face of the wound support 12 can be transmitted to the inside of the wound support 12 mainly by thermal conduction.

[0103] Still in the example of [Fig.3], the thermal fuse 14 is positioned centrally inside the wound support 12, in a radial arrangement.

[0104] Figures 4 to 8 illustrate alternative embodiments of a heating element 2 as previously described with reference to Figures 1 to 3.

[0105] With reference in particular to figures 4 to 8, the envelope 6 has a general shape of a longitudinal tube, said tube having two main faces 40 parallel and connected to each other by rounded edges 42. The main faces 40 of the tube are substantially flat.

[0106] The "longitudinal direction" X of the heating element 2 or heating device 4 means the direction defined along its greatest length of the heating element 2 or heating device 4.

[0107] As can be seen in particular in figures 5 to 8, the wound support(s) 12, having a general shape of one or more plates, have at one of its longitudinal ends one or more electrical connectors 44 arranged to be connected to a positive terminal or a negative terminal of an electrical power supply device (not shown).

[0108] Still in the examples of figures 4 to 8, the heating element 2 has an axis of symmetry S parallel to the longitudinal direction of the heating device 4 and centered along the transverse direction of the heating device 4.

[0109] The heating element 2 has two wound supports 12 distributed on either side of the axis of symmetry S. In other words, these two wound supports 12 are in axial symmetry along the axis of symmetry S.

[0110] In an example of an embodiment such as can be seen in [Fig.6], the heating element 2 includes an overheating prevention device 50 contiguous, contiguous along the transverse direction Y, to one of the wound supports 12, this prevention device 50 having the thermal fuse 14, so that the heat emitted by the heating wire 10 of the wound support 12 can reach the thermal fuse 14 of the prevention device 50.

[0111] As can be seen particularly in figures 7 and 8, one of the wound supports 12 includes the thermal fuse 14.

[0112] In an example of an embodiment such as can be seen in [Fig.7], the thermal fuse 14 is arranged so as to be adjacent to the electrical connector 44, arranged to be connected to a positive or negative terminal of a power supply device electrical (not shown). Thus, the manufacture of the heating element 2 including the thermal fuse 14 is simpler to carry out, to make an electrical connection, for example an electrical solder, between the electrical connector 44 and the thermal fuse 14.

[0113] In an example of an embodiment such as can be seen in [Fig.8], the thermal fuse 14 is arranged centrally along the longitudinal direction X of the wound support 12. Thus, the fact that the thermal fuse 14 is arranged centrally allows for optimal heat transfer on both sides of the thermal fuse 14, and therefore for better responsiveness in the event of a malfunction of the heating element 2.

[0114] As can be seen in particular in figures 9 to 11, the heating element 2 comprises: -a circuit 60 comprising an electrical discharge component arranged in parallel with the thermal fuse 14, so as to discharge an excess of electrical current 70 passing through the thermal fuse 14. The thermal fuse 14 comprises an electrical wire 62 having a resistance value Rf.

[0115] The electrical discharge component 64 includes an electrical resistor 64 having an electrical wire 66 having a resistance value Rr, higher than the resistance value Rf of the electrical wire 62 of the thermal fuse 14.

[0116] As illustrated in particular in [Fig.9], when the electrical wire 66 of the electrical resistor 64 and the electrical wire 62 of the thermal fuse 14 are made of the same material, in particular metal, the cross-section of the electrical wire 66 of the electrical resistor 64 is less than that of the electrical wire 62 of the thermal fuse 14. Thus, in the parallel configuration of the circuit formed by the electrical resistor and the thermal fuse 14, the electric current 70 passes preferentially through the electrical wire 62 of the thermal fuse 14, having a lower resistance value than that of the resistance of the electrical wire 66 of the electrical discharge component 64.

[0117] In fact, when the thermal fuse 14 is no longer operational due to its melting, as can be seen in [Fig. 10], and this following exposure of the thermal fuse 14 to the heat emitted by the heating wire 10 or to an excess of electric current 70 passing through said thermal fuse 14, an electric arc can form at the terminals of this thermal fuse 14. The electrical discharge component 64 thus makes it possible to avoid this phenomenon which could cause serious degradation of the heating device 4, or even a fire thereof.

[0118] Continuing with the example in [Fig. 10], when the thermal fuse 14 melts following the passage of a high electric current 70 through said thermal fuse 14, the electrical wire 62 of the thermal fuse 14 is broken so as to form an open circuit across the terminals of the thermal fuse 14. Thus, the residual electric current 70 can pass through the electrical wire 66 of the discharge component electrical 64 (electrical resistance 64). In this way, the formation of an electric arc across the open circuit terminals of the thermal fuse 14 is avoided.

[0119] As can be seen in particular in [Fig. 11], after a short period of time, on the order of a few milliseconds, the electrical wire 66 of the electrical resistor 64 is broken by the passage of residual electrical current 70, thus forming an open circuit across the terminals of the electrical resistor 64 as well. In this way, following the breaking of the electrical wire 66 of the electrical resistor 64, the flow of electrical current 70 in the heating wire 10 is interrupted.

[0120] The circuit 60 thus designed makes it possible, in two stages, to slow down or even stop the creation of an electric arc which may be caused at the terminals of the thermal fuse 14.

[0121] It can be foreseen that other types of thermal fuses 14 other than those based on wire 62, such as thermal fuses 14 based on solder, of thermosensitive polymer, can be used.

Claims

Demands

1. Heating element (2) for a heating device (4) of a fluid, in particular a heat transfer fluid, in particular for a motor vehicle, said heating element comprising: - a casing (6); - a support (8) around which at least one heating wire (10) is wound so as to form a wound support (12), said wound support being placed at least partially inside the casing (6); - a thermal fuse (14), located inside the casing (6) and electrically connected to the heating wire (10), said thermal fuse being intended to interrupt an electrical current flow (70) in said heating wire 10 when the thermal fuse (14) is subjected to a temperature that reaches a predetermined threshold; and the casing (6) having an inner face (11) oriented towards an electrically insulating and thermally conductive material (34) enclosing the heating wire (10) and an outer face (13) oriented towards the fluid.

2. Heating element (2) according to claim 1, comprising a circuit (60) having an electrical discharge component (64) arranged in parallel with the thermal fuse (14), so as to discharge an excess of electrical current (70) passing through the thermal fuse (14).

3. Heating element (2) according to claim 1 or 2, wherein the thermal fuse (14) is arranged so as to be adjacent to an electrical connector (44) which is arranged to be connected to a positive terminal or a negative terminal of an electrical power supply device.

4. Heating element (2) according to any one of claims 1 to 3, wherein the interior of the wound support (12) is at least partially filled with electrically insulating and thermally conductive material (34), for example, an electrically insulating and thermally conductive ceramic.

5. Heating element (2) according to claim 4, wherein the thermal fuse (14) is centrally arranged along the longitudinal direction (X) of the wound support (12).

6. Heating element (2) according to any one of claims 1 to 5, wherein the thermal fuse (14) is positioned on the inner face of the wound support (12), the inner face being an opposite face of the outer face of the support (8) around which the heating wire (10) is wound and oriented towards the electrically insulating and thermally conductive material (34).

7. Heating element (2) according to any one of claims 1 to 6, wherein the thermal fuse (14) is positioned centrally inside the wound support (12) in a radial arrangement.

8. Heating element (2) according to any one of claims 1 to 8, wherein the casing (6) has a general cylindrical shape, preferably a general cylindrical shape of revolution, open at one end and closed at the opposite end by a base (30).

9. Heating element (2) according to any one of claims 1 to 6, wherein the casing (6) has a general shape of a longitudinal tube.

10. Heating element (2) according to any one of the preceding claims, comprising: - an axis of symmetry (S) parallel to a longitudinal direction (X) of the heating device (4) and centered along the transverse direction (Y) of the heating device; and - at least two wound supports (12) distributed on either side of the axis of symmetry.

11. Heating element (2) according to claim 10, comprising: - an overheating prevention device (50) contiguous, preferably contiguous along the transverse direction (X), to one of the wound supports (12), this overheating prevention device comprising the thermal fuse (14), so that the heat emitted by the heating wire (10) of the wound support (12) can reach the thermal fuse (14) of the overheating prevention device (50).

12. Heating device (4) for a fluid, in particular a heat transfer fluid, said heating device (4) comprising a housing (18) arranged to receive at least one heating element (2) according to any one of claims 1 to 11.

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