CN111586907A - heater assembly and ptc heater - Google Patents

Abstract

The invention provides a heater assembly and a ptc heater, wherein the heater assembly comprises a first electrode plate, a second electrode plate, a ceramic plate group and two heat-conducting insulating plates, the ceramic plate group is clamped between the first electrode plate and the second electrode plate, the two heat-conducting insulating plates are respectively attached to the outer side of the first electrode plate and the outer side of the second electrode plate, and at least one heat-conducting insulating plate is used for being in direct contact with a to-be-heated member so as to conduct heat to the to-be-heated member. The heater assembly has high heating efficiency, energy conservation, light weight and convenient transportation and installation.

Description

heater assembly and ptc heater

technical field

The present invention relates to the field of heating equipment, in particular, to a heater assembly and a ptc heater.

Background technique

At present, the on-board air conditioning system includes a ptc (Positive Temperature Coefficient thermistor) heater. When the on-board air-conditioning system is heating, the ptc heater generates heat under high voltage or low voltage through a ceramic sheet, and the heat is transferred to the on-board system. Coolant, the coolant passes through the heater of the air conditioning box to heat the passenger compartment.

After research, it is found that the existing ptc heater has the following shortcomings:

Heating efficiency is low.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a heater assembly and a ptc heater capable of improving heating efficiency.

Embodiments of the present invention are implemented as follows:

In a first aspect, an embodiment of the present invention provides a heater assembly, including:

A first electrode sheet, a second electrode sheet, a ceramic sheet group and two thermally conductive insulating plates, the ceramic sheet group is clamped between the first electrode sheet and the second electrode sheet, and the two thermally conductive insulating plates are respectively connected to the first electrode sheet The outer side of the second electrode sheet is bonded to the outer side of the second electrode sheet, and at least one of the thermally conductive insulating plates is used for direct contact with the to-be-heated element, so as to conduct heat to the to-be-heated element.

In an optional embodiment, the thermally conductive insulating plate is a ceramic insulating plate.

In an optional embodiment, the ceramic sheet group includes a plurality of ceramic sheets arranged in sequence, adjacent ceramic sheets in the same group are bonded together, and opposite sides of each ceramic sheet are respectively connected to the first electrode sheet and the second electrode sheet fit.

In an optional embodiment, the number of ceramic sheet groups is multiple, and the multiple ceramic sheet groups are arranged at intervals; the number of first electrode sheets is the same as the number of ceramic sheet groups, and the multiple ceramic sheet groups are connected to The electrode sheets are attached one by one.

In an optional embodiment, both the first electrode sheet and the second electrode sheet are bonded to the ceramic sheet group.

In an optional embodiment, both the first electrode sheet and the second electrode sheet are bonded to the thermally conductive insulating plate.

In a second aspect, an embodiment of the present invention provides a ptc heater, where the ptc heater includes:

The heater assembly of any of the preceding embodiments.

In an optional embodiment, the ptc heater further includes a first flow channel plate and a second flow channel plate, the first flow channel plate is connected to the second flow channel plate, and the heater assembly is clamped between the first flow channel plate and the second flow channel plate. between the flow channel plates, and the two thermally conductive insulating plates of the heater assembly are in direct contact with the first flow channel plate and the second flow channel plate respectively.

In an optional embodiment, the first flow channel plate is provided with a first flow channel, and the first flow channel has at least one bent section in its extending direction.

In an optional embodiment, the second flow channel plate is provided with a second flow channel, and the second flow channel has at least one bent section in its extending direction.

The beneficial effects of the embodiments of the present invention are:

To sum up, this embodiment provides a heater assembly, which includes a ceramic sheet group, two electrode sheets, and two thermally conductive insulating plates. The plate is attached to the outside of the two electrode sheets. When in use, the heater assembly is matched with the part to be heated. Specifically, the thermally conductive insulating plate of the heater assembly is directly contacted with the part to be heated, and the two electrode sheets are electrically connected to the positive electrode and the negative electrode of the power supply respectively, and the ceramic sheet group generates heat. The heat is conducted directly to the object to be heated through the thermally conductive insulating plate. Since the thermally conductive insulating plate is in direct contact with the object to be heated, the thermal resistance between the two is small and the heat transfer efficiency is high, so that the heating efficiency of the heater assembly is high and energy is saved. At the same time, the heater assembly has a simple structure, is lighter in weight than conventional heater assemblies, and is easy to transport and assemble.

This embodiment also provides a ptc heater, including the above heater assembly, which is light in weight, high in heating efficiency, energy-saving and environmentally friendly.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram of an exploded structure of a heater assembly according to an embodiment of the present invention;

2 is a schematic structural diagram of a modified structure of the heater assembly according to the embodiment of the present invention (the thermally conductive insulating plate is not shown);

3 is a schematic structural diagram of another modified structure of the heater assembly according to the embodiment of the present invention (the thermally conductive insulating plate is not shown);

4 is a schematic structural diagram of a ptc heater according to an embodiment of the present invention;

Fig. 5 is the exploded structure schematic diagram of the ptc heater of the embodiment of the present invention;

6 is a schematic structural diagram of a first flow channel plate according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a second flow channel plate according to an embodiment of the present invention.

icon:

001-ptc heater; 100-heater assembly; 110-first electrode sheet; 120-second electrode sheet; 130-ceramic sheet group; 140-thermal insulating plate; 150-plug; 200-installation shell; 1 mounting lug; 220 - second mounting lug; 300 - cover body; 310 - third mounting lug; 400 - circuit board; 500 - first flow channel plate; 510 - first flow channel; 520 - inlet; 521 -water inlet pipe; 530-outlet; 531-outlet pipe; 540-first barrier strip; 550-first shunt strip; 551-first sub-channel; 560-first installation side; 570-second installation side; 580 - first connecting hole; 590 - second connecting hole; 591 - mounting protrusion; 600 - second flow channel plate; 610 - second flow channel; 620 - second barrier strip; 630 - third connecting hole; 640 - Fourth connection hole; 650-fourth mounting lug; 660-fifth mounting lug; 670-third mounting side; 680-fourth mounting side; 700-flow channel cover plate; 710-sixth mounting lug; 800-Seal.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Referring to FIGS. 1 to 3 , this embodiment provides a heater assembly 100 , which can be applied to a vehicle-mounted air-conditioning system to heat the cooling liquid of the vehicle-mounted air-conditioning system. Obviously, the heater assembly 100 can also be applied to other devices that need to be heated. environment, and are not listed one by one in this embodiment. The heater assembly 100 has high heating efficiency, light weight and low manufacturing cost.

Referring to FIG. 1 , in this embodiment, the heater assembly 100 includes a first electrode sheet 110 , a second electrode sheet 120 , a ceramic sheet group 130 and two thermally conductive insulating plates 140 , and the ceramic sheet group 130 is sandwiched by the first electrode Between the sheet 110 and the second electrode sheet 120, two thermally conductive insulating plates 140 are respectively attached to the outside of the first electrode sheet 110 and the outside of the second electrode sheet 120, and at least one thermally conductive insulating plate 140 is used to directly connect with the element to be heated. contact to conduct heat to the object to be heated.

In the heater assembly 100 provided in this embodiment, when in use, the heater assembly 100 is matched with the element to be heated. Electrically connected to the positive and negative electrodes of the power supply, respectively, the ceramic sheet group 130 generates heat, and conducts the heat directly to the object to be heated through the thermally conductive insulating plate 140 . Since the thermally conductive insulating plate 140 is in direct contact with the object to be heated, the thermal resistance between the two is small and the heat transfer efficiency is high, so that the heating efficiency of the heater assembly 100 is high and energy is saved. Meanwhile, the heater assembly 100 has a simple structure, is lighter in weight than the conventional heater assembly 100, and is convenient for transportation and assembly.

It should be noted that, the heater assembly 100 can heat a flow channel plate having a flow channel, so as to heat a fluid, such as a cooling liquid, circulating in the flow channel. Optionally, the heater assembly 100 may be sandwiched between two flow channel plates, and the two thermally conductive insulating plates 140 are in direct contact with the two flow channel plates, respectively, so as to heat the fluid through the flow channel plates.

In this embodiment, optionally, the number of ceramic sheet groups 130 may be multiple, the plurality of ceramic sheet groups 130 are arranged at intervals, and the distance between adjacent ceramic sheet groups 130 is set as required.

Each ceramic sheet group 130 includes a plurality of ceramic sheets, the plurality of ceramic sheets of the same ceramic sheet group 130 are arranged in sequence, two adjacent ceramic sheets are attached, and the opposite sides of the plurality of ceramic sheets of the same group are respectively connected to the first The motor sheet and the second electrode sheet 120 are attached. In other words, the plurality of ceramic sheets are evenly spread between the first electrode sheet 110 and the second electrode sheet 120 .

Optionally, multiple ceramic sheet groups 130 are sandwiched between the same first electrode sheet 110 and the second electrode sheet 120. When the first electrode sheet 110 and the second electrode sheet 120 are powered on, all the ceramic sheet groups 130 Both can heat up at the same time.

Referring to FIG. 2 or FIG. 3 , in other embodiments, at least two ceramic sheet groups 130 do not share the first electrode sheet 110 . For example, the number of the first electrode sheets 110 is equal to the number of the ceramic sheet groups 130 . A first electrode sheet 110 is attached to the sheet group 130 correspondingly, and a plurality of ceramic sheet groups 130 share a second electrode sheet 120 . Each of the first electrode sheet 110 and the second electrode sheet 120 can form an independent passage, and the on-off of the corresponding passage is controlled by different switches. After the first electrode sheet 110 and the second electrode sheet 120 are energized, the corresponding first The ceramic sheet group 130 between the electrode sheet 110 and the second electrode sheet 120 . In other words, the plurality of ceramic sheet groups 130 are provided independently, and each ceramic sheet group 130 can be controlled by a corresponding switch, so as to heat the corresponding ceramic sheet group 130, which can reduce the current fluctuation during power adjustment.

For example, in this embodiment, the number of ceramic sheet groups is three, the number of first electrode sheets 110 is three, and the three first electrode sheets 110 are respectively attached to the three ceramic sheet groups 130 . In addition, the shape and position of each ceramic sheet set 130 are set as required, and are not specifically limited.

It should be noted that the first electrode sheet 110 can be connected to a positive electrode, and correspondingly, the second electrode sheet 120 can be connected to a negative electrode; obviously, the first electrode sheet 110 can be connected to a negative electrode, and the second electrode sheet 120 is connected to a positive electrode. In addition, a first pin may be provided on the first electrode sheet 110, a second pin may be provided on the second electrode sheet 120, and a plurality of pins may be integrated together to form a plug 150, thereby facilitating connection with a control system. The control system includes: The circuit board 400 and the plug 150 are electrically connected to the circuit board 400 .

In this embodiment, optionally, the ceramic sheet may be in the shape of a rectangular plate, and a plurality of ceramic sheets are tiled in such a manner that the length sides of adjacent ceramic sheets are attached to each other.

Optionally, both the first electrode sheet 110 and the second electrode sheet 120 may be configured as rectangular sheets.

In this embodiment, the ceramic sheet is fixed to the first electrode sheet 110 and the second electrode sheet 120 by bonding. For example, thermally conductive adhesive can be used for bonding and fixing.

In this embodiment, optionally, two thermally conductive insulating plates 140 are attached to the outer sides of the first electrode sheet 110 and the second electrode sheet 120 , and the thermally conductive insulating plates 140 can completely cover the first electrode sheet 110 and the second electrode sheet 120 the outer side, thereby enhancing the insulation effect.

In addition, when the number of the first electrode sheets 110 or the second electrode sheets 120 is multiple, the thermally conductive insulating plate 140 may cover the multiple first electrode sheets 110 and the second electrode sheets 120 at the same time.

It should be noted that the thermally conductive insulating plate 140 and the first electrode sheet 110 and the second electrode sheet 120 are all fixed by means of bonding. For example, the thermally conductive insulating plate 140 and the first electrode sheet 110 and the second electrode sheet 120 are both Glue to fix.

It should be understood that the thermally conductive insulating plate 140 may be, but is not limited to, a ceramic insulating plate.

The heater assembly 100 provided in this embodiment has high heating efficiency, simple structure and light weight.

Referring to FIGS. 4-7 , this embodiment also provides a ptc heater 001, which includes a mounting shell 200, a cover 300, a circuit board 400, a first flow channel plate 500, a second flow channel plate 600, a flow channel The cover plate 700 and the heater assembly 100 mentioned in the above embodiments.

The circuit board 400 is disposed in the cavity formed by the installation shell 200 and the cover body 300 . A first flow channel 510 is provided on one side. The first flow channel plate 500 is further provided with an inlet 520 and an outlet 530 , and the inlet 520 communicates with one end of the first flow channel 510 . The second flow channel plate 600 is connected to the side of the first flow channel plate 500 away from the mounting shell 200 , the side of the second flow channel plate 600 facing away from the first flow channel plate 500 is provided with a second flow channel 610 , and the heater assembly 100 is clamped Hold between the first flow channel plate 500 and the second flow channel plate 600 , the two thermally conductive insulating plates 140 of the heater assembly 100 are in direct contact with the first flow channel plate 500 and the second flow channel plate 600 , respectively. The flow channel cover plate 700 is sealedly connected to the side of the second flow channel plate 600 facing away from the first flow channel plate 500 , and one end of the second flow channel 610 on the second flow channel plate 600 communicates with the other end of the first flow channel 510 , The second flow channel 610 is communicated with the outlet 530 on the first flow channel plate 500, so that after the fluid flows in from the inlet 520, it flows out from the outlet 530 after passing through the first flow channel 510 and the second flow channel 610. During the fluid flow process , the heater assembly 100 exchanges heat with the fluid.

Please refer to FIG. 6 , optionally, the first flow channel plate 500 is provided with a plurality of first barrier bars 540 , and the plurality of first barrier bars 540 are arranged at intervals along the extending direction of the first flow channel 510 . The first flow channel 510 It has a first installation side 560 and a second installation side 570 perpendicular to its extending direction, and one end of two adjacent first barrier bars 540 is connected to the first installation side 560 and the second installation side 570 respectively. The other end of the first barrier strip 540 is spaced from the second mounting side 570 and the first mounting side 560, so that the first flow channel channel forms at least one bent section, thereby changing the direction of fluid flow in the first flow channel channel, The time for the fluid to flow in the first flow channel 510 is prolonged, and the heat exchange efficiency between the fluid and the thermally conductive insulating plate 140 is improved.

Optionally, the number of the first barrier strips 540 is four, and in the extending direction of the first flow channel 510, they are the barrier strip a, the barrier bar b, the barrier bar c, and the barrier bar d, and the barrier bar a and the barrier bar c. Both are connected to the first installation side 560 , and the barrier strips b and d are both connected to the second installation side 570 . The inlet 520 is provided on the side of the barrier bar a away from the barrier bar b, and is located on the first installation side 560 , and the first flow channel plate 500 is provided with the second flow channel 610 on the side of the barrier bar d away from the barrier bar c. The first connection hole 580 communicates with the first flow channel 510 . The first flow channel plate 500 is further provided with a second connection hole 590 for communicating with the second flow channel 610 on the side where the first connection hole 580 is provided. The second connection hole 590 is also communicated with the outlet 530 and the first connection hole 580 and the second connection hole 590 are independent of each other.

Optionally, a plurality of first shunt bars 550 are further provided in the first flow channel 510 , the first shunt bars 550 are arranged in a direction perpendicular to the first flow channel 510 , and two ends of the first shunt bars 550 are respectively connected with the first flow channel 510 . The first installation side 560 and the second installation side 570 are spaced apart, the first flow channel 510 is separated by the first flow channel 550 to form a plurality of first sub-flow channels 551, and the plurality of first flow separation bars 550 have the function of fins. When flowing in the first flow channel 510, it is in contact with the plurality of first diverting bars 550, thereby increasing the heat exchange area of the fluid and improving the heat exchange efficiency.

Optionally, the first flow channel plate 500 is provided with mounting protrusions 591 , the number of the mounting protrusions 591 is multiple, and the plurality of mounting protrusions 591 are arranged at intervals along the circumferential direction of the first flow channel plate 500 . Each mounting protrusion 591 is provided with a screw hole, and the screw hole penetrates the mounting protrusion 591 along the thickness direction of the first flow channel plate 500 .

Optionally, the installation shell 200 is provided with a first installation lug 210 and a second installation lug 220, and both the first installation lug 210 and the second installation lug 220 are provided with threaded holes.

Optionally, the cover body 300 is provided with third mounting lugs 310 .

Referring to FIG. 7 , optionally, a plurality of second barrier bars 620 are installed on the side of the second flow channel plate 600 away from the second flow channel plate 600 , and the plurality of second barrier bars 620 extend along the second flow channel 610 The directions are spaced apart, the second flow channel 610 has a third mounting side 670 and a fourth mounting side 680 perpendicular to its extending direction, and one end of the two adjacent second barrier bars 620 is respectively mounted on the third mounting side 670 and the fourth mounting side 680 The sides 680 are connected. Correspondingly, the other ends of the two adjacent second barrier strips 620 are spaced from the fourth mounting side 680 and the third mounting side 670, so that the second flow channel channel forms at least one bent section, thereby changing the The direction in which the fluid flows in the second flow channel extends the time for the fluid to flow in the second flow channel 610 , and improves the heat exchange efficiency between the fluid and the thermally conductive insulating plate 140 .

Optionally, the second flow channel plate 600 is provided with a third connection hole 630 and a fourth connection hole 640 that are independent of each other, and both the third connection hole 630 and the fourth connection hole 640 communicate with the second flow channel 610 .

Optionally, in the second flow channel 610 is further provided a plurality of second distribution bars, the second distribution bars are arranged in a direction perpendicular to the second flow channel 610, and the two ends of the second distribution bars are respectively installed with the third distribution bar. The side 670 and the fourth installation side 680 are spaced apart, the second flow channel 610 is separated by the second flow channel 610 to form a plurality of second sub-flow channels, the plurality of second flow channels have the function of fins, and the fluid flows in the second flow channel 610 When flowing in the middle, it is in contact with a plurality of second shunt bars, thereby increasing the heat exchange area of the fluid and improving the heat exchange efficiency.

Optionally, the second flow channel plate 600 is provided with a plurality of fourth mounting lugs 650 and a plurality of fifth mounting lugs 660, and the fourth mounting lugs 650 and the fifth mounting lugs 660 are both provided with threaded holes. .

Optionally, a plurality of sixth mounting lugs 710 are provided on the flow channel cover plate 700 , and each sixth mounting lug 710 is provided with a threaded hole.

For the ptc heater 001 provided in this embodiment, during assembly, the circuit board 400 is accommodated between the mounting shell 200 and the cover body 300 , and the second mounting lugs 220 on the mounting shell 200 are mounted with the third mounting lugs on the cover body 300 . The lugs 310 are in one-to-one correspondence, and the second mounting lugs 220 and the third mounting lugs 310 are fixedly connected by screwing them in the threaded holes communicated with each other. The side of the first flow channel plate 500 with the first flow channel 510 is attached to the mounting shell 200, and a sealing ring 800 is provided in the circumferential direction of the connecting position of the two. The plurality of mounting protrusions 591 on the first flow channel plate 500 and the mounting shell The plurality of first mounting lugs 210 on the 200 are in one-to-one correspondence, and are screwed together by screws. A water inlet pipe 521 and a water outlet pipe 531 are respectively provided at the inlet 520 and the outlet 530 of the first flow channel plate 500 . The heater assembly 100 is sandwiched between the first flow channel plate 500 and the second flow channel plate 600, and the two thermally conductive insulating plates 140 of the heater assembly 100 are in direct contact with the first flow channel plate 500 and the second flow channel plate 600, respectively , the plug 150 of the heater assembly 100 integrated by the pins of the first electrode sheet 110 and the second electrode sheet 120 is electrically connected to the circuit board 400 , and the second flow channel 610 on the second flow channel plate 600 faces away from the heater assembly 100 . The fourth mounting lugs 650 on the second flow channel plate 600 cooperate with the mounting protrusions 591 on the first flow channel plate 500, and the two are fixedly connected by screws. The first connecting hole 580 on the first flow channel plate 500 communicates with the third connecting hole 630 on the second flow channel, and the second connecting hole 590 on the first flow channel plate 500 communicates with the fourth connecting hole on the second flow channel plate 600 640 Connected. The flow channel cover plate 700 is covered on the side where the second flow channel plate 600 is provided with the second flow channel 610, and a sealing ring 800 is provided at the connection position of the flow channel cover plate 700 and the second flow channel 610, so as to realize the communication between the two. Seal the connection. The sixth mounting lugs 710 on the flow channel cover 700 cooperate with the fifth mounting lugs 660 on the second flow channel plate 600, and the two are fixedly connected by screws.

In the ptc heater 001 provided in this embodiment, the cooling liquid enters from the water inlet pipe 521 , flows in the first flow channel 510 , and enters the second flow channel 610 from the first connection hole 580 , and flows in the second flow channel 610 The cooling liquid flows through the second connection hole 640 of the second flow channel 610 back to the second connection hole 590, and then flows out from the water outlet pipe 531. The cooling liquid exchanges heat with the heat generated by the heater assembly 100 during the flow. The heat-conducting insulating plate 140 of the heater assembly 100 is in direct contact with the flow channel plate, so that the heat-conducting effect is good and the heating efficiency is high.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A heater assembly, characterized in that, comprising: A first electrode sheet, a second electrode sheet, a ceramic sheet group and two thermally conductive insulating plates, the ceramic sheet group is sandwiched between the first electrode sheet and the second electrode sheet, the two thermally conductive sheets The insulating plates are respectively attached to the outside of the first electrode sheet and the outside of the second electrode sheet, and at least one of the thermally conductive insulating plates is used for direct contact with the element to be heated, so as to conduct heat to the element to be heated superior. 2. The heater assembly of claim 1, wherein: The thermally conductive insulating plate is a ceramic insulating plate. 3. The heater assembly of claim 1, wherein: The ceramic sheet group includes a plurality of ceramic sheets arranged in sequence, the adjacent ceramic sheets in the same group are bonded together, and the opposite sides of each ceramic sheet are respectively connected with the first electrode sheet and the second electrode sheet. The electrode pads are attached. 4. The heater assembly of claim 1, wherein: The number of the ceramic sheet groups is multiple, and the plurality of the ceramic sheet groups are arranged at intervals; the number of the first electrode sheets is the same as the number of the ceramic sheet groups, and the plurality of the ceramic sheet groups are the same as the multiple ceramic sheet groups. The first electrode sheets are attached in a one-to-one correspondence. 5. The heater assembly of claim 1, wherein: Both the first electrode sheet and the second electrode sheet are bonded to the ceramic sheet group. 6. The heater assembly of claim 1, wherein: Both the first electrode sheet and the second electrode sheet are bonded to the thermally conductive insulating plate. 7. A ptc heater, wherein the ptc heater comprises: 6. The heater assembly of any of claims 1-6. 8. ptc heater according to claim 7, is characterized in that: The ptc heater further includes a first flow channel plate and a second flow channel plate, the first flow channel plate is connected with the second flow channel plate, and the heater assembly is clamped between the first flow channel plate and the second flow channel plate. between the second flow channel plates, and the two thermally conductive insulating plates of the heater assembly are in direct contact with the first flow channel plate and the second flow channel plate, respectively. 9. ptc heater according to claim 8, is characterized in that: The first flow channel plate is provided with a first flow channel, and the first flow channel has at least one bent section in its extending direction. 10. The ptc heater according to claim 8, characterized in that: The second flow channel plate is provided with a second flow channel, and the second flow channel has at least one bent section in the extending direction thereof.

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