Heating device and electric automobile

Abstract

The utility model relates to a heating device and an electric automobile. Provided is a technique capable of suppressing a short circuit between a high-potential-side terminal and a low-potential-side terminal while eliminating a magnetic field generated by a current. A heating device heats a fluid to be heated using a heater that generates heat by a current flowing therethrough. The heater is provided with: a first end part connected to a high-potential-side terminal; a second end portion connected to the low-potential-side terminal; and an extension portion extending from the first end portion to the second end portion. The first end portion and the second end portion are disposed at positions separated from each other. The extension part is provided with: a reversal part that reverses the extension direction between the first end part and the second end part; a first extension portion closer to the first end portion side than the reversal portion; and a second extension section that is closer to the second end section side than the reversal section. The first extension portion and the second extension portion are disposed adjacent to each other such that the direction of the current flowing through the first extension portion and the direction of the current flowing through the second extension portion are opposite to each other.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a heating device and an electric vehicle. Background Art

[0002] A heating device is disclosed in Patent Document 1. The heating device of Patent Document 1 has a heating conductor layer formed on a substrate. The heating conductor layer includes heating conductor traces extending on the substrate. The heating conductor traces are configured to form a plurality of trace portions extending adjacent to each other. In addition, an inversion portion is provided at a portion where the orientation of the heating conductor trace changes. A plurality of connection portions for connecting the heating conductor trace to a power source are arranged in the edge region of the heating device, and the plurality of connection portions are arranged adjacent to each other.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 6451870 Gazette Summary of the Utility Model

[0006] Problems to be Solved by the Utility Model

[0007] In the heating device of Patent Document 1, since a plurality of connection portions for connecting the heating conductor trace to a power source are adjacent to each other, there is a possibility that the connection portion connected to the high-potential side of the power source and the connection portion connected to the low-potential side of the power source may be short-circuited.

[0008] This specification provides a technology capable of eliminating the magnetic field generated by current and suppressing short-circuiting between the high-potential side terminal and the low-potential side terminal.

[0009] Solutions to Solve the Problems

[0010] In the first aspect of the present technology, a heating device heats a fluid to be heated by a heater that generates heat when an electric current flows through it. Alternatively, the heater may include: a first end portion connected to a high-potential side terminal; a second end portion connected to a low-potential side terminal; and an extension portion extending from the first end portion to the second end portion. Alternatively, the first end portion and the second end portion may be arranged at positions separated from each other. Alternatively, the extension portion may include: an inversion portion that reverses the extension direction between the first end portion and the second end portion; a first extension portion closer to the first end portion side than the inversion portion; and a second extension portion closer to the second end portion side than the inversion portion. Alternatively, the first extension portion and the second extension portion may be arranged adjacent to each other such that the direction of the current flowing in the first extension portion and the direction of the current flowing in the second extension portion are opposite directions.

[0011] According to this structure, the magnetic field generated due to the current flowing in the first extension part and the magnetic field generated due to the current flowing in the second extension part can cancel each other out. In addition, since the terminal on the high potential side to which the first end is connected and the terminal on the low potential side to which the second end is connected are separated from each other, short - circuiting between the terminal on the high potential side and the terminal on the low potential side can be suppressed.

[0012] In the second aspect, according to the first aspect above, it may also be that the first end portion and the second end portion are arranged at positions separated by 90° or more in the circumferential direction of the heater with the inversion portion as the center.

[0013] According to this structure, the terminals on the high potential side and the low potential side can be separated to a large extent, and short - circuiting between the two can be suppressed.

[0014] In the third aspect, according to the first aspect or the second aspect above, it may also be that the first end portion and the second end portion are arranged at positions opposite to each other in the radial direction of the heater with the inversion portion therebetween.

[0015] According to this structure, since the length of the first extension part on the side of the first end portion relative to the inversion portion and the length of the second extension part on the side of the second end portion relative to the inversion portion can be made equal, the magnetic field generated due to the current flowing in the first extension part and the magnetic field generated due to the current flowing in the second extension part can be made equal. Thus, the magnetic field can be eliminated with good balance. In addition, the terminals on the high potential side and the low potential side can be separated to a large extent, and short - circuiting between the two can be suppressed.

[0016] In the fourth aspect, according to any one of the first aspect to the third aspect above, it may also be that the heating device further includes a lead - out portion for leading out the heated fluid heated by the heater. It may also be that the first end portion and the second end portion are arranged at positions opposite to the lead - out portion.

[0017] There is a tendency that the temperature of the heater is higher near the first end portion and the second end portion of the heater than in other parts. On the other hand, near the lead - out portion, the heated fluid flows in a manner concentrated toward the lead - out portion. According to the above structure, since the heated fluid can be heated by using the parts near the first end portion and the second end portion of the heater in the portion where the heated fluid is concentrated, the heated fluid can be heated efficiently.

[0018] In the fifth aspect, according to any one of the first aspect to the fourth aspect above, it may also be that the first extension part and the second extension part are each configured in a spiral shape. It may also be that the heating device further includes a flow path for allowing the heated fluid to flow in the radial direction of the spiral - shaped first extension part and second extension part.

[0019] According to this structure, since the fluid to be heated can flow in a direction orthogonal to the extending directions (vortex directions) of the first extension part and the second extension part, the fluid to be heated can be heated efficiently.

[0020] In the sixth aspect, the electric vehicle may be provided with the heating device according to any one of the first to fifth aspects. According to this structure, the accuracy of temperature management of the fluid to be heated used in the electric vehicle can be improved. Description of the Drawings

[0021] Figure 1 is a longitudinal sectional view of the heating device of the embodiment.

[0022] Figure 2 is a top view of the heater of the embodiment.

[0023] Figure 3 is Figure 1 an enlarged view of part III of

[0024] Description of Reference Numerals

[0025] 2. Heating device; 4. Housing; 6. Introduction pipe; 7. Discharge pipe; 10. Heater; 22. Upper surface side flow path; 24. Lower surface side flow path; 26. Outer side flow path; 28. Connection flow path; 31. First end; 32. Second end; 33. Extension part; 35. Reversing part; 42. Upper side member; 44. Lower side member; 46. Cover member; 48. Lower surface side member; 50. First spacer; 52. Second spacer; 80. Pressing member; 100. Elastic member; 102. First terminal; 104. Second terminal; 331. First extension part; 332. Second extension part; 351. First reversing part; 352. Second reversing part. Detailed Description of the Invention

[0026] (Embodiment)

[0027] The heating device 2 of the embodiment will be described with reference to the drawings. As Figures 1 to 3 shown, the heating device 2 includes a heater 10, a pressing member 80, an elastic member 100, and a housing 4. The heater 10, the pressing member 80, and the elastic member 100 are accommodated inside the housing 4. In addition, the heating device 2 includes an introduction pipe 6 (first introduction pipe 6a and second introduction pipe 6b) for introducing the fluid to be heated into the housing 4 and a discharge pipe 7 for discharging the fluid to be heated to the outside of the housing 4. The fluid to be heated introduced into the housing 4 is, for example, water, coolant, etc. The fluid to be heated introduced into the housing 4 functions as a heat medium of the heating device 2. The heating device 2 is a device that heats the fluid to be heated by the heater 10.

[0028] (Structure of Heater 10)

[0029] Heater 10 is an electric heater that generates heat when an electric current flows through it. Heater 10 is formed by winding a tubular member in a spiral shape. Heater 10 is, for example, a sheathed heater or a ceramic heater. Heater 10 includes, for example, a heating element 90, a tubular housing 94 that houses the heating element 90, and a powdery insulating material 96 filled in the gap between the heating element 90 and the housing 94 (see Figure 3 ). The heating element 90 is formed of, for example, a helical nickel-chromium alloy wire. Heater 10 generates heat when an electric current flows through the heating element 90.

[0030] As Figure 2 shown, Heater 10 includes a first end portion 31, a second end portion 32, and an extension portion 33 between the first end portion 31 and the second end portion 32. The first end portion 31 of Heater 10 is located at one end in the length direction of Heater 10. The first end portion 31 is electrically connected to a first terminal 102 on the high potential side. The first terminal 102 is electrically connected to the high potential side of a power supply (not shown).

[0031] The second end portion 32 of Heater 10 is located at the other end in the length direction of Heater 10. The second end portion 32 is electrically connected to a second terminal 104 on the low potential side. The second terminal 104 is electrically connected to the low potential side of a power supply (not shown).

[0032] The first end portion 31 and the second end portion 32 are arranged at positions separated from each other. For example, the first end portion 31 and the second end portion 32 are arranged at positions separated by 90° or more in the circumferential direction of Heater 10 with a later-described inversion portion 35 as the center. For example, the first end portion 31 and the second end portion 32 are arranged at positions facing each other in the radial direction of Heater 10 with the inversion portion 35 interposed therebetween.

[0033] In heating device 2, electric power is supplied to Heater 10 from a power supply (not shown) via the first terminal 102 and the second terminal 104. Heater 10 generates heat by the electric power supplied from the power supply. Heating device 2 heats the fluid to be heated with the heat generated in Heater 10.

[0034] The extension portion 33 of Heater 10 extends from the first end portion 31 to the second end portion 32. The extension portion 33 includes an inversion portion 35 that reverses the extension direction between the first end portion 31 and the second end portion 32. In addition, the extension portion 33 includes a first extension portion 331 on the first end portion 31 side with respect to the inversion portion 35 and a second extension portion 332 on the second end portion 32 side with respect to the inversion portion 35.

[0035] The first extension part 331 extends from the first end part 31 to the inversion part 35. The first extension part 331 is configured, for example, in a spiral shape that spirals clockwise from the first end part 31 to the inversion part 35 in a plan view state. The first extension part 331 extends along the spiral direction.

[0036] The second extension part 332 extends from the second end part 32 to the inversion part 35. The second extension part 332 is configured, for example, in a spiral shape that spirals clockwise from the second end part 32 to the inversion part 35 in a plan view state. The second extension part 332 extends along the spiral direction.

[0037] The first extension part 331 and the second extension part 332 are adjacently arranged such that the direction of the current flowing in the first extension part 331 and the direction of the current flowing in the second extension part 332 are opposite. The first extension part 331 and the second extension part 332 are arranged at intervals. The first extension part 331 and the second extension part 332 are alternately arranged along the radial direction of the heater 10.

[0038] The inversion part 35 between the first extension part 331 and the second extension part 332 is a part that reverses the extension direction of the extension part 33. The inversion part 35 is located at the central part in the radial direction of the spiral extension part 33. The inversion part 35 includes a first inversion part 351 and a second inversion part 352. In the second inversion part 352, the extension direction of the extension part 33 reverses, for example, clockwise from the first extension part 331 to the first inversion part 351. In the first inversion part 351, the extension direction of the extension part 33 reverses, for example, clockwise from the second extension part 332 to the second inversion part 352.

[0039] (Structure of the pressing member 80)

[0040] As Figure 1 shown, the pressing member 80 is arranged inside the housing 4 so as to cover the upper surface 10a of the heater 10. The pressing member 80 is configured in a substantially disc shape. The pressing member 80 extends in the radial direction of the heater 10 ( Figure 1 the left - right direction). The pressing member 80 is arranged to be movable up and down between the heater 10 and the housing 4. The pressing member 80 faces the upper surface 10a of the heater 10 and extends laterally along the upper surface 10a of the heater 10.

[0041] An upper surface side flow path 22 is provided between the upper surface 10a of the heater 10 and the lower surface 80b of the pressing member 80. The upper surface side flow path 22 extends laterally along the upper surface 10a of the heater 10. The upper surface side flow path 22 extends in the radial direction of the heater 10. The upper surface side flow path 22 is a flow path for allowing the heated fluid to flow laterally along the upper surface 10a of the heater 10. The upper surface side flow path 22 is a flow path for allowing the heated fluid to flow in the radial direction of the heater 10 (i.e., the radial direction of the spiral extension portion 33 (the first extension portion 331 and the second extension portion 332) of the heater 10).

[0042] A plurality of first spacers 50 are provided on the lower surface 80b (the surface on the heater 10 side) of the pressing member 80. The plurality of first spacers 50 are arranged between the lower surface 80b of the pressing member 80 and the upper surface 10a of the heater 10. A plurality of first spacers 50 are fixed to the lower surface 80b of the pressing member 80. The plurality of first spacers 50 extend radially in the radial direction of the heater 10. The plurality of first spacers 50 are arranged at intervals along the circumferential direction of the heater 10. Each first spacer 50 ensures the interval between the upper surface 10a of the heater 10 and the lower surface 80b of the pressing member 80. Thus, each first spacer 50 ensures the width of the upper surface side flow path 22 in the vertical direction. The pressing member 80 presses the heater 10 downward by means of the plurality of first spacers 50.

[0043] (Structure of the housing 4)

[0044] The housing 4 includes a first accommodation portion 40 for accommodating the heater 10, the pressing member 80, the elastic member 100, etc. In addition, the housing 4 includes a second accommodation portion 41 for accommodating the wiring board 140.

[0045] The housing 4 includes: an upper side member 42 that faces the pressing member 80; a lower side member 44 that faces the heater 10; and a cover member 46 that faces the lower side member 44. The first accommodation portion 40 is formed in the portion surrounded by the upper side member 42 and the lower side member 44. The second accommodation portion 41 is formed in the portion surrounded by the lower surface side member 48 and the cover member 46.

[0046] An outer side flow path 26 is provided between the upper side member 42 of the housing 4 and the pressing member 80. The outer side flow path 26 extends laterally along the pressing member 80. The outer side flow path 26 extends in the radial direction of the heater 10. The outer side flow path 26 is a flow path for allowing the heated fluid to flow laterally along the pressing member 80. The outer side flow path 26 is a flow path for allowing the heated fluid to flow in the radial direction of the heater 10.

[0047] An elastic member 100 is disposed in an outer flow path 26 between the upper side member 42 and the pressing member 80. The elastic member 100 functions as a spring that presses the pressing member 80. The upper end portion of the elastic member 100 contacts the upper side member 42 of the housing 4, and the lower end portion of the elastic member 100 contacts the pressing member 80. The elastic member 100 presses the pressing member 80 toward the heater 10 by the reaction force of the upper side member 42 of the housing 4. Thus, the pressing member 80 presses the heater 10 downward.

[0048] The lower side member 44 of the housing 4 includes a lower surface side member 48 that faces the lower surface 10b of the heater 10. The lower surface side member 48 is disposed so as to cover the lower surface 10b of the heater 10. The lower surface side member 48 is configured in a substantially disk shape. The lower surface side member 48 extends in the radial direction of the heater 10. The lower surface side member 48 extends laterally along the lower surface 10b of the heater 10.

[0049] A lower surface side flow path 24 is provided between the lower surface 10b of the heater 10 and the upper surface 48a of the lower surface side member 48. The lower surface side flow path 24 extends laterally along the lower surface 10b of the heater 10. The lower surface side flow path 24 extends in the radial direction of the heater 10. The lower surface side flow path 24 is a flow path that allows the fluid to be heated to flow laterally along the lower surface 10b of the heater 10. The lower surface side flow path 24 is a flow path that allows the fluid to be heated to flow in the radial direction of the heater 10 (i.e., the radial direction of the spiral extension portion 33 (the first extension portion 331 and the second extension portion 332) of the heater 10).

[0050] A plurality of second spacers 52 are provided on the upper surface 48a (the surface on the heater 10 side) of the lower surface side member 48. The plurality of second spacers 52 are disposed between the upper surface 48a of the lower surface side member 48 and the lower surface 10b of the heater 10. A plurality of second spacers 52 are fixed to the upper surface 48a of the lower surface side member 48. The plurality of second spacers 52 extend radially in a radial direction of the heater 10. The plurality of second spacers 52 are arranged at intervals along the circumferential direction of the heater 10. Each second spacer 52 ensures a gap between the lower surface 10b of the heater 10 and the upper surface 48a of the lower surface side member 48. Thus, each second spacer 52 ensures the width in the vertical direction of the lower surface side flow path 24.

[0051] A connection flow path 28 is provided between the outer end portion of the lower surface side member 48 and the outer end portion of the pressing member 80 (see Figure 3). The connecting flow path 28 is provided around the outermost periphery of the heater 10, surrounding the outermost periphery of the heater 10. The connecting flow path 28 extends in the circumferential direction of the heater 10 along the outermost periphery of the heater 10. The connecting flow path 28 is provided at a position opposite to the first end 31 and the second end 32 of the heater 10. In addition, the connecting flow path 28 is connected to the upper surface side flow path 22 and the lower surface side flow path 24. The connecting flow path 28 is a flow path that guides the heated fluid after flowing through the upper surface side flow path 22 and the lower surface side flow path 24 to the outer flow path 26.

[0052] (Structure of Inlet Pipe 6 (First Inlet Pipe 6a and Second Inlet Pipe 6b) and Discharge Pipe 7)

[0053] like Figure 1 As shown, the first inlet pipe 6a of the heating device 2 is connected to the upper member 42 of the housing 4. The downstream end of the first inlet pipe 6a is fixed to the upper member 42 of the housing 4. The first inlet pipe 6a extends upward from the upper member 42 of the housing 4. The first inlet pipe 6a can also be manufactured integrally with the housing 4. The first inlet pipe 6a has an inlet flow path 60 for introducing the heated fluid into the interior of the housing 4.

[0054] The second inlet pipe 6b is connected to the pressing member 80. The downstream end of the second inlet pipe 6b is fixed to the pressing member 80. The second inlet pipe 6b extends upward from the pressing member 80. The second inlet pipe 6b can also be manufactured integrally with the pressing member 80. The upstream end of the second inlet pipe 6b is inserted into the inlet flow path 60 of the first inlet pipe 6a. A sealing member 68 (for example, an O-ring) is arranged between the second inlet pipe 6b and the first inlet pipe 6a. The second inlet pipe 6b can move up and down along the first inlet pipe 6a. The second inlet pipe 6b moves up and down as the pressing member 80 moves up and down.

[0055] The second inlet pipe 6b includes an inlet port 62 for introducing the heated fluid into the housing 4. The inlet port 62 is located above the upper surface 10a of the heater 10. The inlet port 62 opens above the upper surface 10a of the heater 10. The inlet port 62 is located opposite the inverting portion 35 of the heater 10. The inlet port 62 opens toward the inverting portion 35 of the heater 10. The inlet port 62 introduces the heated fluid toward the inverting portion 35 of the heater 10.

[0056] The discharge pipe 7 is connected to the upper side member 42 of the housing 4. The upstream end of the discharge pipe 7 is fixed to the upper side member 42 of the housing 4. The discharge pipe 7 extends upward from the upper side member 42 of the housing 4. The discharge pipe 7 may also be integrally manufactured with the housing 4. The discharge pipe 7 has a discharge flow path 70 for discharging the heated fluid to the outside of the housing 4. The discharge flow path 70 communicates with the outer flow path 26 inside the housing 4. The discharge flow path 70 discharges the heated fluid from the outer flow path 26 to the outside of the housing 4.

[0057] (Operation of the heating device 2)

[0058] In the above-mentioned heating device 2, the heated fluid is introduced into the inside of the housing 4 through the introduction pipe 6 connected to the housing 4. The heated fluid is introduced toward the reversing portion 35 of the heater 10. The heated fluid introduced into the inside of the housing 4 flows into the upper surface side flow path 22 and the lower surface side flow path 24. The heated fluid flows radially outward along the upper surface 10a and the lower surface 10b of the heater 10 in a radial direction. The heated fluid flowing in the upper surface side flow path 22 and the lower surface side flow path 24 is heated by the heater 10 during the radial flow.

[0059] The heated fluid heated by the heater 10 is discharged to the outer flow path 26 through the connection flow path 28. The heated fluid discharged to the outer flow path 26 is discharged to the outside of the housing 4 through the discharge pipe 7 connected to the housing 4.

[0060] (Effect)

[0061] As described above, the heating device 2 of the embodiment has been described. As described above, the heating device 2 includes a heater 10 that generates heat when an electric current flows through it and heats the heated fluid. The heater 10 includes: a first end 31 connected to the first terminal 102 on the high potential side; a second end 32 connected to the second terminal 104 on the low potential side; and an extension portion 33 extending from the first end 31 to the second end 32. The first end 31 and the second end 32 are arranged at positions separated from each other. The extension portion 33 includes: a reversing portion 35 that reverses the extension direction between the first end 31 and the second end 32; a first extension portion 331 closer to the first end 31 than the reversing portion 35; and a second extension portion 332 closer to the second end 32 than the reversing portion 35. The first extension portion 331 and the second extension portion 332 are adjacently arranged such that the direction of the current flowing in the first extension portion 331 and the direction of the current flowing in the second extension portion 332 are opposite.

[0062] According to this structure, the magnetic field generated due to the current flowing in the first extension portion 331 and the magnetic field generated due to the current flowing in the second extension portion 332 can cancel each other out. In addition, since the first terminal 102 on the high potential side connected to the first end portion 31 and the second terminal 104 on the low potential side connected to the second end portion 32 are separated from each other, short - circuiting between the first terminal 102 on the high potential side and the second terminal 104 on the low potential side can be suppressed.

[0063] The first end portion 31 and the second end portion 32 of the heater 10 are arranged, for example, at positions separated by 90° or more in the circumferential direction of the heater 10 with the inversion portion 35 as the center. According to this structure, the first terminal 102 on the high potential side and the second terminal 104 on the low potential side can be separated to a greater extent, and short - circuiting between the two can be suppressed.

[0064] The first end portion 31 and the second end portion 32 of the heater 10 are arranged, for example, at positions radially opposite to each other across the inversion portion 35. According to this structure, since the length of the first extension portion 331 on the side of the first end portion 31 closer to the inversion portion 35 and the length of the second extension portion 332 on the side of the second end portion 32 closer to the inversion portion 35 can be made equal, the magnetic field generated by the first extension portion 331 and the magnetic field generated by the second extension portion 332 can be made equal. Thus, the magnetic field can be eliminated with good balance. In addition, the first terminal 102 on the high potential side and the second terminal 104 on the low potential side can be separated to a greater extent, and short - circuiting between the two can be suppressed.

[0065] In addition, the heating device 2 includes a connecting flow path 28 (an example of a leading - out portion) that leads the heated fluid heated by the heater 10 to the outer flow path 26. The first end portion 31 and the second end portion 32 of the heater 10 are arranged at positions facing the connecting flow path 28.

[0066] In the heater 10 that generates heat by the flow of current, there is a tendency for the vicinity of the first end portion 31 connected to the first terminal 102 and the vicinity of the second end portion 32 connected to the second terminal 104 to be hotter than other parts. On the other hand, in the vicinity of the connecting flow path 28, the heated fluid flows in a manner concentrated toward the connecting flow path 28. According to the above - described structure, since the heated fluid can be heated by the portions near the first end portion 31 and the second end portion 32 of the heater 10 in the portion where the heated fluid is concentrated, the heated fluid can be heated efficiently.

[0067] In addition, the first extension portion 331 and the second extension portion 332 of the heater 10 are each configured in a spiral shape. The heating device 2 is provided with flow paths (an upper surface side flow path 22 and a lower surface side flow path 24) that allow the fluid to be heated to flow in the radial direction of the spiral first extension portion 331 and second extension portion 332. According to this configuration, since the fluid to be heated can flow in a direction orthogonal to the extension direction (spiral direction) of the first extension portion 331 and the second extension portion 332, the fluid to be heated can be efficiently heated.

[0068] The above-described heating device 2 may also be mounted on an automobile (e.g., an electric vehicle, a hybrid vehicle, a gasoline vehicle, etc.). For example, the heating device 2 may also be used to heat the heat medium of the heating device of an automobile. According to this configuration, the accuracy of temperature management of the fluid to be heated (heat medium) used in an automobile can be improved.

[0069] As described above, specific examples of the present utility model have been described in detail, but these are merely illustrative and are not intended to limit the claims. The technology described in the claims includes technologies obtained by various modifications and changes to the above-described specific examples. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or the drawings can achieve multiple purposes simultaneously, and achieving one of the purposes itself has technical usefulness.

Claims

1. A heating device that heats a fluid by using a heater that generates heat when an electric current flows through it, characterized in that: The heater comprises: a first end portion connected to a terminal on a high potential side; a second end portion connected to the terminal on the low potential side; and an extension portion extending from the first end portion to the second end portion, The first end portion and the second end portion are arranged at positions separated from each other, The extension portion includes: a reversing portion that reverses the extension direction between the first end portion and the second end portion; a first extension portion that is closer to the first end portion than the reversing portion; and a second extension portion that is closer to the second end portion than the reversing portion. The first extension portion and the second extension portion are adjacently arranged so that a direction of current flowing through the first extension portion and a direction of current flowing through the second extension portion are opposite to each other.

2. The heating device according to claim 1, characterized in that The first end portion and the second end portion are arranged at positions separated by 90° or more in the circumferential direction of the heater with the inversion portion as the center.

3. The heating device according to claim 1 or 2, characterized in that The first end portion and the second end portion are arranged at positions facing each other in the radial direction of the heater with the inversion portion interposed therebetween.

4. The heating device according to claim 1, characterized in that The heating device further includes a discharge portion for discharging the heated fluid heated by the heater. The first end portion and the second end portion are arranged at positions facing the lead-out portion.

5. The heating device according to claim 1, characterized in that The first extension portion and the second extension portion are respectively configured in a spiral shape. The heating device further includes a flow path for causing a heated fluid to flow in a radial direction of the spirally shaped first extending portion and the second extending portion.

6. An electric vehicle, characterized in that: This electric vehicle includes the heating device according to claim 1 .

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