PTC heating element and PTC heater

Abstract

The invention relates to the technical field of heating, and particularly provides a PTC heating element and a PTC heater, the PTC heating element comprises a PTC component and two electrodes with opposite polarities; the PTC component comprises two first surfaces which are oppositely arranged along a first direction and two second surfaces which are oppositely arranged along a second direction; each second surface is connected with the two first surfaces, and the second direction is perpendicular to the first direction; each electrode comprises a main body part and two polarity parts; main body parts of the two electrodes are respectively arranged on the two first surfaces, and current is introduced into the PTC component through the main body parts; in each electrode, the two polarity parts are arranged on the two second surfaces respectively, and the two polarity parts on each second surface are arranged in a spaced mode. The device is small in size, high in space utilization rate, convenient to assemble and high in heating efficiency.

Description

Technical Field

[0001] The present invention relates to the field of heating technology, in particular to a PTC heating element and a PTC heater. Background Art

[0002] PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient. The resistance value of materials with positive temperature coefficient increases as the temperature rises. Using this characteristic, PTC components can be combined with heat dissipation components to form heaters, which are widely used in electric mosquito coils, electric perfume holders, air conditioning auxiliary heating, automotive thermal management systems, etc., with a large market scale.

[0003] In a typical PTC heating element, the metallized electrodes are usually located on the upper and lower main surfaces of the PTC element, and the current is also introduced from the upper and lower main surfaces. For SMT and cable-type PTC heating elements, the introduction of current from the upper and lower main surfaces will make the heater structure complex and difficult to miniaturize. Summary of the invention

[0004] The PTC heating element and PTC heater provided by the embodiments of the present invention at least solve the problems of complex structure and large size of existing elements, and are compact in size, high in space utilization, easy to assemble, and high in heating efficiency.

[0005] In the first aspect, the present invention provides a PTC heating element, including a PTC component, the PTC component including two first surfaces arranged opposite to each other along a first direction, and two second surfaces arranged opposite to each other along a second direction; each of the second surfaces is respectively connected to two of the first surfaces, and the second direction is perpendicular to the first direction; two electrodes with opposite polarities; each of the electrodes includes a main body and two polarity parts; the main bodies of the two electrodes are respectively arranged on the two first surfaces, and current is introduced into the PTC component through the main body; in each of the electrodes, the two polarity parts are respectively arranged on the two second surfaces, and the two polarity parts on each second surface are arranged at intervals; wherein, when power is turned on, heat is generated through the surface resistance of the PTC component between the two polarity parts with opposite polarities located on the same second surface; heat is generated through the body resistance of the PTC component between the two polarity parts with opposite polarities located on different second surfaces.

[0006] In one embodiment of the present invention, the two polarity portions with opposite polarities located on different second surfaces have the same shapes.

[0007] In one embodiment of the present invention, the polarity portion is configured as a rectangular structure, and the areas of the two polarity portions located on the same second surface are different.

[0008] In one embodiment of the present invention, the polarity portion includes a first extension portion, which is connected to the main body portion and extends along a third direction; wherein the third direction is perpendicular to the first direction and the second direction respectively; and a second extension portion, which extends along the first direction and one end of the second extension portion is connected to one end of the first extension portion; wherein the two second extension portions located on the same second surface are arranged sequentially along the third direction.

[0009] In one embodiment of the present invention, the polarity portion includes a first extension portion, which is connected to the main body portion and extends along a third direction; at least one second extension portion, which extends along the first direction and one end of the second extension portion is connected to the first extension portion; wherein a plurality of the second extension portions located on the same second surface are arranged alternately in sequence along the third direction.

[0010] In one embodiment of the present invention, the thickness of the electrode is not less than 3 microns.

[0011] In one embodiment of the present invention, along the third direction, the size of the main body is not less than 2 mm.

[0012] In one embodiment of the present invention, along the first direction, the size of each of the polarity portions is not less than 1 mm; or / and, the first distance and the second distance are both related to the maximum operating voltage; wherein, the first distance is the spacing distance between two of the polarity portions located on the same second surface; and the second distance is the distance between two of the second surfaces.

[0013] In a second aspect, the present invention further provides a PTC heater, comprising a plurality of PTC heating elements as described in any one of the above items; and two pole pieces with opposite polarities, wherein the two pole pieces are electrically connected to the corresponding main body parts respectively.

[0014] In one embodiment of the present invention, the plurality of PTC heating elements are sequentially arranged at intervals along the third direction; or, the plurality of PTC heating elements are sequentially arranged along the third direction.

[0015] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0016] The PTC heating element of the present invention provides a main body on the first surface, connects the polarity parts on the two second surfaces with the main body, and introduces current into the PTC component through the main body. On the one hand, the volume of the PTC heating element can be effectively reduced, the space utilization rate can be improved, and the assembly of the heater is convenient. On the other hand, the surface and the body of the PTC heating element generate heat at the same time, which ensures the overall temperature uniformity of the PTC heating element and has high heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 It is one of the structural schematic diagrams of the PTC heating element in the preferred embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the PTC component in the preferred embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the electrode in a preferred embodiment of the present invention.

[0021] Figure 4 It is one of the structural schematic diagrams of the main body in the preferred embodiment of the present invention.

[0022] Figure 5 This is the second structural schematic diagram of the main body in the preferred embodiment of the present invention.

[0023] Figure 6 It is one of the dimension diagrams of the polar part in the preferred embodiment of the present invention.

[0024] Figure 7 This is the second structural schematic diagram of the PTC heating element in the preferred embodiment of the present invention.

[0025] Figure 8 This is the second structural diagram of the polar part in the preferred embodiment of the present invention.

[0026] Fig. 9 This is the third structural schematic diagram of the PTC heating element in the preferred embodiment of the present invention.

[0027] Fig.10 This is the third structural diagram of the polar part in the preferred embodiment of the present invention.

[0028] Fig.11This is the fourth structural diagram of the PTC heating element in the preferred embodiment of the present invention.

[0029] Fig.12 This is the fourth structural diagram of the polar part in the preferred embodiment of the present invention.

[0030] Fig.13 It is one of the structural schematic diagrams of the PTC heater in the preferred embodiment of the present invention.

[0031] Fig.14 This is the second structural schematic diagram of the PTC heater in the preferred embodiment of the present invention.

[0032] The above drawings include the following reference numerals:

[0033] D1, first direction; D2, second direction; D3, third direction; 10, PTC component; 11, first surface; 12, second surface; 20, electrode; 21, main body; 22, polarity part; 221, first extension part; 222, second extension part; 30, pole piece. DETAILED DESCRIPTION

[0034] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0035] Reference Figure 1 As shown, the present invention provides a PTC heating element, including a PTC component 10 and two electrodes 20 .

[0036] The PTC component 10 is made of a material with a positive temperature coefficient; preferably, the material of the PTC component 10 is a thermistor ceramic. Figure 2 As shown, the PTC component 10 includes two first surfaces 11 arranged opposite to each other along a first direction D1, and two second surfaces 12 arranged opposite to each other along a second direction D2. Each second surface 12 connects the two first surfaces 11 respectively, and the second direction D2 is perpendicular to the first direction D1.

[0037] Preferably, the PTC component 10 is configured as a rectangular parallelepiped structure, which further includes two surfaces along the third direction D3, and the third direction D3 is perpendicular to the first direction D1 and the second direction D2, respectively. Preferably, in the rectangular parallelepiped PTC component 10, the first direction D1 is the length direction, the second direction D2 is the thickness direction, and the third direction D3 is the width direction. Preferably, the dimension H of the PTC component 10 in the second direction D2 is smaller than its dimension W in the third direction D3; the dimension W of the PTC component 10 in the third direction D3 is smaller than its dimension L in the first direction D1. The square PTC component 10 is easy to prepare, has high space utilization, is easy to assemble, and has high uniformity of heat conduction.

[0038] The polarities of the two electrodes 20 are opposite, and it can be understood that one electrode 20 is positive and the other electrode 20 is negative. Figure 1 and Figure 3 As shown, each electrode 20 includes a main body portion 21 and two polarity portions 22 .

[0039] The main bodies 21 of the two electrodes 20 are respectively arranged on the two first surfaces 11, and are electrically connected to the PTC component 10 and the corresponding polarity parts 22. When in use, current is introduced into the PTC component 10 through the main body 21. Since the current is introduced into the PTC component 10 from the first surface 11, the volume of the PTC heating element can be effectively reduced, the space utilization rate can be improved, and the assembly of the heater is convenient.

[0040] Those skilled in the art can set the shape of the main body 21 according to actual needs. Figure 4 and Figure 5 As shown, the main body 21 is configured as a strip structure, or the main body 21 is configured as a plurality of strip structures sequentially arranged in intervals along the third direction D3. Of course, the main body 21 can also cover the entire first surface 11, that is, the size of the main body 21 along the third direction D3 is less than or equal to the size of the PTC component 10 along the third direction D3.

[0041] Preferably, in some embodiments, when the main body 21 is configured as a strip structure, the dimension W of the main body 21 along the third direction D3 is 1 Not less than 2 mm to prevent electrical breakdown. 1 Settings are 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm etc.

[0042] In each electrode 20 , two polarity portions 22 are respectively disposed on two second surfaces 12 , and the two polarity portions 22 on each second surface 12 are disposed at intervals.

[0043] Those skilled in the art can set the material of the electrode 20 according to actual needs, such as aluminum, copper, silver, aluminum, zinc, etc.

[0044] Those skilled in the art can set the way of connecting the electrode 20 to the PTC component 10 according to actual needs, for example, by soldering, surface mounting, snap connection, spraying, screen printing, chemical plating, electroplating, sputtering, etc.

[0045] Exemplarily, first, a 100-500 mesh screen is used to print the slurry onto the two second surfaces 12 to form the polar portions 22. After each side is printed, it is dried at a temperature of 100-350°C before printing the other side.

[0046] Next, the PTC components 10 with the two second surfaces 12 printed are arranged neatly, and the slurry is printed on the two first surfaces 11 using a 100-450 mesh screen to form the main body 21. After printing one side, it is dried at a temperature of 100-350°C before printing the other side.

[0047] Finally, each printed PTC component 10 is laid flat on a setter plate, and placed in a muffle furnace for heat treatment at a temperature of 400-800° C. / 5 min-120 min to obtain a finished PTC heating element.

[0048] Preferably, in the PTC heating element of the present invention, in some embodiments, the thickness of the electrode 20 is not less than 3 microns to prevent electrical breakdown. Exemplarily, the thickness of the electrode 20 can be set to 3 microns, 3.5 microns, 4 microns, 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, etc.

[0049] In actual use, when the PTC heating element is powered on, heat is generated between the two polarity parts 22 with opposite polarities on the same second surface 12 through the surface resistance of the PTC component 10; and heat is generated between the two polarity parts 22 with opposite polarities on different second surfaces 12 through the body resistance of the PTC component 10. The surface and body of the PTC heating element are heated simultaneously, which ensures the overall temperature uniformity of the PTC heating element and has high heating efficiency.

[0050] The PTC heating element of the present invention is provided with a main body 21 on the first surface 11, the main body 21 is connected to the polarity parts 22 on the two second surfaces 12, and the current is introduced into the PTC component 10 through the main body 21. On the one hand, the volume of the PTC heating element can be effectively reduced, the space utilization rate can be improved, and the assembly of the heater is convenient. On the other hand, the surface and the body of the PTC heating element generate heat at the same time, which ensures the overall temperature uniformity of the PTC heating element and has high heating efficiency.

[0051] In some embodiments of the PTC heating element of the present invention, the shapes of the two polarity portions 22 with opposite polarities on different second surfaces 12 are consistent. By setting this structure, the PTC heating element can be ensured to have good temperature uniformity, stable performance, and easy production.

[0052] On the premise that the shape of the polar portion 22 is consistent, further, refer to Figure 1 and Figure 6 As shown, in some embodiments of the PTC heating element of the present invention, the polarity portion 22 is configured as a rectangular structure, and the areas of the two polarity portions 22 located on the same second surface 12 are different. The working state of the PTC heating element of this structure when in use is a DC working state.

[0053] Although the PTC heating element of this structure has the advantages of small size, high space utilization, easy assembly, high heating efficiency, etc., in actual use, the staff found that under a certain duty cycle, the PTC heating element in the DC working state will produce abnormal noise, which can be clearly heard in a low-noise environment. As one of the important components of the thermal management system of new energy vehicles, the abnormal noise produced by the PTC heating element greatly affects the comfort of passengers.

[0054] On the premise that the shape of the polarity portion 22 is consistent, further, in some embodiments of the PTC heating element of the present invention, the polarity portion 22 includes a first extension portion 221 and a second extension portion 222. The first extension portion 221 is connected to the main body portion 21, and the first extension portion 221 extends along the third direction D3. The second extension portion 222 extends along the first direction D1, and one end of the second extension portion 222 is connected to one end of the first extension portion 221, so that the working state of the PTC heating element when in use is an AC working state, thereby effectively reducing the abnormal noise generated during use in the DC working state.

[0055] Specifically, refer to Figure 7As shown, in some embodiments, on the same second surface 12, the polarity portion 22 of each electrode 20 includes only one first extension portion 221 and one second extension portion 222. On the same second surface 12, only two second extension portions 222 are provided, and the second extension portions 222 are sequentially provided along the third direction D3.

[0056] In some embodiments, on the same second surface 12, the polarity portion 22 of each electrode 20 includes only one first extension portion 221 and at least one second extension portion 222. The specific number of the second extension portions 222 can be one, two, three, etc. The multiple second extension portions 222 located on the same second surface 12 are sequentially staggered along the third direction D3.

[0057] Reference Fig. 9 As shown, the polarity portion 22 of one electrode 20 includes two second extension portions 222 , and the polarity portion 22 of the other electrode 20 includes one second extension portion 222 . Correspondingly, on the other second surface 12 , the numbers of the second extension portions 222 of the polarity portions 22 of the two electrodes 20 are opposite.

[0058] Reference Fig.11 As shown, the polarity portion 22 of one electrode 20 includes three second extension portions 222 , and the polarity portion 22 of another electrode 20 includes two second extension portions 222 . Correspondingly, on the other second surface 12 , the numbers of the second extension portions 222 of the polarity portions 22 of the two electrodes 20 are opposite.

[0059] By setting this structure, in actual use, the current polarity changes alternately, so that the working state of the PTC heating element during use is an AC working state, thereby effectively reducing the abnormal noise generated during use in the DC working state.

[0060] Regardless of the shape of the polarity portion 22, the first distance and the second distance of the PTC heating element of the present invention are related to the maximum operating voltage. The first distance is the spacing distance between two polarity portions 22 located on the same second surface 12; the second distance is the distance between the two second surfaces 12, that is, the thickness H. Specifically, the corresponding relationship is shown in Table 1.

[0061] Table 1. Relationship between the first distance, the second distance and the maximum operating voltage

[0062]

[0063] In the table, VDC is the abbreviation of Voltage Direct Current, and the corresponding number represents the DC voltage of the corresponding volt. mm is millimeter. By limiting the maximum operating voltage that can be applied to PTC heating elements of different distance sizes, the power can be controlled, electrical breakdown can be avoided, and the service life of the element can be extended to a certain extent.

[0064] Regardless of the shape of the polar portion 22, refer to Figure 6 , Figure 8 , Fig.10 and Fig.12 As shown, in the PTC heating element of the present invention, along the first direction D1, the size of each polarity portion 22 is not less than 1 mm. The following is an analysis of PTC heating elements of different sizes in combination with Table 2 and Table 3.

[0065] Table 2. PTC heating elements of different sizes

[0066]

[0067] Table 3. Performance of corresponding PTC heating elements

[0068]

[0069] Among them, the shapes of the polarity parts 22 of the electrodes 20 of the PTC heating elements No. 1, 2, 4 and 6 refer to Figure 1 and Figure 6 As shown. The shape of the polarity portion 22 of the electrode 20 of the PTC heating element No. 3 is as shown in FIG. Fig. 9 and Fig.10 The shape of the polarity portion 22 of the electrode 20 of the PTC heating element No. 5 is as shown in FIG. Figure 7 and Figure 8 As shown. The shape of the polarity portion 22 of the electrode 20 of the PTC heating element No. 6 is as shown in FIG. Fig.11 and Fig.12 shown.

[0070] When the PTC heating element has not reached the Curie temperature, the resistance is relatively low, and when the current passes through it, it will generate more heat to achieve heating. When the PTC heating element reaches the Curie temperature, the resistance increases and the current decreases, thereby achieving the effect of self-limiting temperature.

[0071] It can be seen from this that the PTC heating element of the present invention has excellent performance, especially the PTC heating element capable of heating in an AC working state can effectively reduce abnormal noise.

[0072] On the other hand, an embodiment of the present invention further provides a PTC heater, comprising a plurality of PTC heating elements as described in any of the above embodiments, and two types of pole pieces 30. Since the PTC heater of the present invention comprises the PTC heating elements described in the above embodiments, the beneficial effects thereof are also possessed by the PTC heater, which will not be described in detail.

[0073] Preferably, each PTC heating element has the same structure, and multiple PTC heating elements of the same structure are arranged in sequence along the third direction D3. The polarities of the two pole pieces 30 are opposite. The two pole pieces 30 are electrically connected to the corresponding main body 21, respectively. Exemplarily, only one positive pole piece and one negative pole piece are provided, the positive pole piece is connected to one of the two electrodes 20 of each PTC heating element, and the negative pole piece is connected to the other of the two electrodes 20 of each PTC heating element.

[0074] Depending on the different shapes of the electrodes 20 of the PTC heating elements on the second surface 12 , there are certain differences when a plurality of PTC heating elements are connected in series using the pole pieces 30 .

[0075] Specifically, refer to Fig.13 As shown, when using a PTC heating element having a polarity portion 22 consisting of a first extension portion 221 and a second extension portion 222, since the polarities of the polarity portions 22 of two adjacent PTC heating elements are opposite, a plurality of PTC heating elements need to be arranged in sequence along the third direction D3.

[0076] Accordingly, refer to Fig.14 As shown, if the polarity of the polarity portions 22 of two adjacent PTC heating elements is the same, the plurality of PTC heating elements are sequentially arranged along the third direction D3 without any interval.

[0077] It should be noted that, under the premise that the polarity of the polarity parts 22 of two adjacent PTC heating elements is opposite, the electrodes 20 can also be arranged at a certain interval along the third direction D3, so that two adjacent PTC heating elements with opposite polarity of the polarity parts 22 can be arranged in sequence without interval.

[0078] Working principle:

[0079] After the plurality of PTC heating elements are sequentially arranged along the third direction D3 , the main bodies 21 of the electrodes 20 of the respective PTC heating elements are connected in series through the pole pieces 30 .

[0080] After current is passed through, heat is generated between two polarity parts 22 with opposite polarities located on the same second surface 12 through the surface resistance of the PTC component 10; heat is generated between two polarity parts 22 with opposite polarities located on different second surfaces 12 through the body resistance of the PTC component 10, thereby achieving heating of the component to be heated.

[0081] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0082] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0083] The various steps described in the method implementation methods provided by the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0084] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0085] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A PTC heating element, characterized in that: include: A PTC component, the PTC component comprising two first surfaces arranged opposite to each other along a first direction, and two second surfaces arranged opposite to each other along a second direction; each of the second surfaces is respectively connected to two of the first surfaces, and the second direction is perpendicular to the first direction; Two electrodes with opposite polarities; each of the electrodes comprises a main body and two polarity parts; the main bodies of the two electrodes are respectively arranged on the two first surfaces, and current is introduced into the PTC component through the main bodies; in each of the electrodes, the two polarity parts are respectively arranged on the two second surfaces, and the two polarity parts on each second surface are arranged at intervals; When power is turned on, heat is generated through the surface resistance of the PTC component between the two polarity parts with opposite polarities located on the same second surface; heat is generated through the body resistance of the PTC component between the two polarity parts with opposite polarities located on different second surfaces.

2. The PTC heating element according to claim 1, characterized in that: The two polarity portions with opposite polarities located on different second surfaces have the same shape.

3. The PTC heating element according to claim 2, characterized in that: The polarity portion is configured as a rectangular structure, and the areas of the two polarity portions located on the same second surface are different.

4. The PTC heating element according to claim 2, characterized in that: The polar portion includes: a first extension portion, the first extension portion being connected to the main body portion, and the first extension portion extending along a third direction; wherein the third direction is perpendicular to the first direction and the second direction respectively; A second extension portion, wherein the second extension portion extends along the first direction, and one end of the second extension portion is connected to one end of the first extension portion; wherein two second extension portions located on the same second surface are arranged in sequence along the third direction.

5. The PTC heating element according to claim 2, characterized in that: The polar portion includes: a first extension portion, the first extension portion being connected to the main body portion and extending along a third direction; At least one second extension portion, the second extension portion extends along the first direction, and one end of the second extension portion is connected to the first extension portion; wherein a plurality of second extension portions located on the same second surface are alternately arranged in sequence along the third direction.

6. The PTC heating element according to any one of claims 1 to 5, characterized in that: The thickness of the electrode is not less than 3 microns.

7. The PTC heating element according to any one of claims 1 to 5, characterized in that: Along the third direction, the size of the main body is not less than 2 mm.

8. The PTC heating element according to any one of claims 1 to 5, characterized in that: Along the first direction, the size of each polar portion is not less than 1 mm; or / and, The first distance and the second distance are both related to the maximum operating voltage; wherein the first distance is the spacing distance between the two polarity portions located on the same second surface; and the second distance is the distance between the two second surfaces.

9. A PTC heater, characterized in that: include: A plurality of PTC heating elements according to any one of claims 1 to 8; as well as Two pole pieces with opposite polarities, the two pole pieces are electrically connected to the corresponding main body parts respectively.

10. The PTC heater according to claim 9, characterized in that: The plurality of PTC heating elements are sequentially arranged at intervals along the third direction; or, The plurality of PTC heating elements are arranged in sequence along the third direction.

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