CN216600105U - PTC heater - Google Patents

Abstract

The utility model provides a PTC heater, which comprises a controller, a heating box body, a sealing plug and a connecting conductor, wherein the heating box body is arranged on the heating box body; a first heat dissipation cavity, a heat production cavity and a second heat dissipation cavity are arranged in the heating box body from top to bottom; the heat-generating cavity is a sealed cavity and contains PTC thermistor elements for dissipating heat to the first heat-dissipating cavity and the second heat-dissipating cavity; the heat-generating cavity is provided with an upward connecting channel communicated with the outside of the heat-generating cavity, and the connecting channel is positioned outside the first heat-radiating cavity; the sealing plug is arranged in the connecting channel, the force of the sealing plug is stored, and sealing is formed between the sealing plug and the connecting channel; the controller is arranged above the heating box body and is electrically connected with the PTC thermistor element through the connecting conductor. The volume is small, and the occupied space is small.

Description

PTC heater

Technical Field

The utility model relates to the technical field of heaters, in particular to a PTC heater.

Background

The PTC heater is a device which generates heat by an internal PTC thermistor element and radiates the heat to a heat transfer medium, and can be used for heating a motor vehicle, for example, a pure electric vehicle does not have an engine and cannot use waste heat of the engine to supply heat for an air conditioning system of the vehicle, so the PTC heater is often used for supplying heat for the air conditioning system of the vehicle in the pure electric vehicle.

The existing PTC heater has the problem of larger volume.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of the problems in the art described above, the present invention is at least partially addressed. Therefore, the PTC heater provided by the utility model has the advantages of small volume and small occupied space.

(II) technical scheme

In order to achieve the purpose, the utility model adopts the main technical scheme that:

the utility model provides a PTC heater, which comprises a controller, a heating box body, a sealing plug and a connecting conductor, wherein the heating box body is arranged on the controller; the heating box body is internally provided with a first heat dissipation cavity, a heat production cavity and a second heat dissipation cavity from top to bottom; the heat-generating cavity is a sealed cavity and contains PTC thermistor elements for dissipating heat to the first heat-dissipating cavity and the second heat-dissipating cavity;

the heat-generating cavity is provided with an upward connecting channel communicated with the outside of the heat-generating cavity, and the connecting channel is positioned outside the first heat-radiating cavity; the sealing plug is arranged in the connecting channel, the force of the sealing plug is stored, and sealing is formed between the sealing plug and the connecting channel; the controller is arranged above the heating box body and is electrically connected with the PTC thermistor element through a connecting conductor.

Optionally, the PTC thermistor component includes a resistance layer, a positive plate and a negative plate, the resistance layer is located between the positive plate and the negative plate, and the resistance layer is electrically connected with the positive plate and the negative plate respectively; and the position of the positive pole piece corresponding to the connecting channel is provided with an upward positive pole rigid metal sheet as a connecting conductor, and the position of the negative pole piece corresponding to the connecting channel is provided with an upward negative pole rigid metal sheet as a connecting conductor.

Optionally, the connecting channel is disposed at an end of the heat generating cavity, the positive rigid metal sheet is located at an end of the positive plate, and the negative rigid metal sheet is located at an end of the negative plate.

Optionally, the terminal of the positive electrode tab protrudes from the resistance layer, and the terminal of the negative electrode tab protrudes from the resistance layer.

Alternatively, the positive electrode rigid metal piece and the negative electrode rigid metal piece are collinear in the left-right direction.

Optionally, the PTC thermistor component comprises a resistance layer, a positive tab and a negative tab, the resistance layer being located between the positive tab and the negative tab; the resistance layer comprises a plurality of PTC thermistors which are sequentially arranged into a layer, and the plurality of PTC thermistors are divided into a plurality of groups; the number of the positive plates is one, and the number of the negative plates is the same as the number of the groups of the PTC thermistors; each group of PTC thermistors is electrically connected with the positive plate, and each group of PTC thermistors is electrically connected with each negative plate; alternatively, the first and second electrodes may be,

the number of the negative plates is one, and the number of the positive plates is the same as the number of the groups of the PTC thermistors; each group of PTC thermistors is electrically connected with the negative plate, and each group of PTC thermistors is electrically connected with each positive plate; alternatively, the first and second electrodes may be,

the number of the positive plates and the number of the negative plates are the same as the grouping number of the PTC thermistors; each group of PTC thermistors is electrically connected with each positive plate, and each group of PTC thermistors is electrically connected with each negative plate.

Optionally, the PTC heater further comprises a first heat dissipation housing, a second heat dissipation housing, a clamp, and a sealing ring; the bottom of first heat dissipation casing forms the heat production cavity through the sealing washer lock on the bottom of the heat dissipation casing of second, a plurality of first tight bosss that press from both sides have on the outside portion of first heat dissipation casing, a plurality of second tight bosss that press from both sides have on the outside portion of the heat dissipation casing of second, the second presss from both sides tight boss and corresponds to first tight boss setting of clamp according to the position relation, press from both sides tight boss pair according to a first tight boss of clamp and a second that the position relation correspondence set up, press from both sides tight boss pair of clamp to the card in a clamp, press from both sides tight first heat dissipation casing and the heat dissipation casing of second.

Optionally, the first clamping boss comprises a first clamping position and a first blocking position from inside to outside, and the first blocking position is higher than the first clamping position in the direction from bottom to top; the second clamping boss comprises a second clamping position and a second blocking position from inside to outside, and the second blocking position is higher than the second clamping position in the direction from top to bottom; when the clamping boss is clamped into the clamp, the clamp sleeve is arranged on the first clamping position and the second clamping position.

Optionally, the first clamping bosses are evenly distributed around the outer side of the first heat dissipation case and the second clamping bosses are evenly distributed around the outer side of the second heat dissipation case.

Optionally, the first clamping boss and the second clamping boss are both semi-cylindrical, the pair of clamping bosses is cylindrical, and the clamp is circular.

(III) advantageous effects

The utility model has the beneficial effects that:

1. the PTC heater provided by the utility model has the advantages that the controller is arranged above the heating box body, the size is small, and the occupied space is small.

2. The positive electrode rigid metal sheet is arranged on the positive electrode sheet corresponding to the connecting channel and serves as a connecting conductor, and the negative electrode rigid metal sheet is arranged on the negative electrode sheet corresponding to the connecting channel and serves as a connecting conductor, so that the PTC thermistor element is conveniently and electrically connected with the controller.

3. Through the cooperation of pressing from both sides tight boss to and the clamp, press from both sides tight first heat dissipation casing and the heat dissipation casing of second, can make first heat dissipation casing pass through the sealing washer and form sealedly with the junction of the heat dissipation casing of second on the one hand, and then do benefit to the sealed of heat production cavity, on the other hand is convenient for dismantle first heat dissipation casing and the heat dissipation casing of second when needing, does benefit to PTC heating element's maintenance and change.

Drawings

The utility model is described with the aid of the following figures:

FIG. 1 is a schematic perspective view of a heating cartridge according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the heating cartridge of FIG. 1 taken along direction AB;

FIG. 3 is a cross-sectional view of the heating cartridge of FIG. 1 taken along the CD direction;

fig. 4 is an exploded view of the PTC thermistor assembly according to the embodiment of the present invention before the assembly is completed;

fig. 5 is a schematic view of the structure of the PTC thermistor device according to the embodiment of the present invention after the assembly is completed;

fig. 6 is an exploded view of the first heat dissipation case, the second heat dissipation case and the PTC thermistor device according to the embodiment of the present invention before the assembly is completed;

fig. 7 is a schematic perspective view of a sealing plug according to an embodiment of the utility model;

fig. 8 is a schematic perspective view of the first heat dissipation case, the second heat dissipation case, and the PTC thermistor according to the embodiment of the present invention after the assembly is completed.

[ description of reference ]

1: heating the box body;

11: a first heat dissipation cavity; 12: a heat generating cavity; 13: a second heat dissipation cavity; 14: a connecting channel;

2: a sealing plug;

21: a through hole;

3: a PTC thermistor element;

31: a resistive layer; 32: a positive plate; 33: a negative plate; 34: a positive electrode rigid metal sheet; 35: a negative electrode rigid metal sheet; 36: a first thermally conductive insulating film; 37: a second thermally conductive insulating film; 38: a PTC thermistor; 39: a mounting frame;

41: a first heat dissipation housing; 42: a second heat dissipation housing; 44: a first clamping boss; 45: a second clamping boss; 46: clamping a hoop;

411: a first clamping position; 412: a first blocking position; 421: a second clamping position; 422: and a second blocking position.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. As used herein, the terms "upper," "lower," "front," "rear," "left," "right," and the like are used with reference to the orientation of FIG. 1.

As shown in fig. 1, 2 and 3, the PTC heater provided in the present embodiment includes a controller (not shown in the drawings), a heating case 1, a sealing plug 2 and a connecting conductor. The heating box body 1 is internally provided with a first heat dissipation cavity 11, a heat generating cavity 12 and a second heat dissipation cavity 13 from top to bottom; the heat generating cavity 12 is a sealed cavity, and accommodates the PTC thermistor component 3, and is configured to dissipate heat to the first heat dissipating cavity 11 and the second heat dissipating cavity 13. The heat-generating cavity 12 is provided with a connecting channel 14 which is upward and communicated with the outside of the heat-generating cavity 12, and the connecting channel 14 is positioned outside the first heat-radiating cavity 11; a through hole 21 is formed in the sealing plug 2, the connecting conductor penetrates through the through hole 21, the through hole 21 stores force, sealing is formed between the through hole 21 and the connecting conductor, the sealing plug 2 is plugged in the connecting channel 14, the sealing plug 2 stores force, and sealing is formed between the sealing plug 2 and the connecting channel 14; the controller is installed above the heating box body 1, and the controller is electrically connected with the PTC thermistor element 3 through a connecting conductor. The PTC heater arranged in this way has small volume and small occupied space by arranging the controller above the heating box body 1.

The force accumulation means the deformation generated by the outward expansion of the through hole 21 and the deformation generated by the compression of the sealing plug 2. Thereby, sealing of heat-generating cavity 12 is achieved. The number of the through holes 21 formed in the sealing plug 2 may be one, or may be set in accordance with the number of the connecting conductors, as long as the heat generating cavity 12 can be sealed.

Preferably, as shown in fig. 4 and 5, the PTC thermistor component 3 includes a resistance layer 31, a positive tab 32 and a negative tab 33, the resistance layer 31 is located between the positive tab 32 and the negative tab 33, the resistance layer 31 is electrically connected to the positive tab 32 and the negative tab 33 respectively, so that the resistance layer 31 can be electrically heated; the positive electrode sheet 32 has an upward positive electrode rigid metal sheet 34 as a connecting conductor at a position corresponding to the connecting passage 14, and the negative electrode sheet 33 has an upward negative electrode rigid metal sheet 35 as a connecting conductor at a position corresponding to the connecting passage 14. Thus, the PTC thermistor device 3 is electrically connected to the controller.

Preferably, the positive electrode rigid metal sheet 34 and the negative electrode rigid metal sheet 35 are wrapped with an insulating rubber sleeve. The insulating rubber sleeve can be a silica gel sleeve.

Preferably, in the present embodiment, the connecting passage 14 is one. The structure is simple. It is conceivable that a plurality of connecting channels 14 may be provided to electrically connect the PTC thermistors of the controller; as an example, the similar effect can be achieved by providing two connecting passages 14, i.e., the first connecting passage 14 and the second connecting passage 14, respectively, and the positive electrode rigid metal piece 34 passing through the first connecting passage 14 and the negative electrode rigid metal piece 35 passing through the second connecting passage 14.

Further preferably, as shown in fig. 2 and 5, the connection passage 14 is provided at the end of the heat-generating chamber 12, the positive rigid metal plate 34 is located at the end of the positive plate 32, and the negative rigid metal plate 35 is located at the end of the negative plate 33. Thus, the structure is compact.

Further preferably, the terminal of the positive tab 32 (i.e. the end of the positive tab 32 provided with the positive rigid metal tab 34) protrudes out of the resistance layer 31, and the terminal of the negative tab 33 (i.e. the end of the negative tab 33 provided with the negative rigid metal tab 35) protrudes out of the resistance layer 31. In this way, the heat transfer area between the positive electrode sheet 32 and the negative electrode sheet 33 is increased.

Further preferably, the positive electrode rigid metal piece 34 and the negative electrode rigid metal piece 35 are collinear in the left-right direction.

In order to improve the heat exchange efficiency, the casing forming the heat-generating cavity 12 is generally made of metal, the PTC thermistor device 3 is placed in the heat-generating cavity 12 formed of metal, and the PTC thermistor device 3 is likely to leak electricity to the casing of the heat-generating cavity 12 after being powered on, so that the work is not good. Therefore, in the present embodiment, the PTC thermistor component 3 further includes a first thermally conductive insulating film 36 and a second thermally conductive insulating film 37, and as shown in fig. 5, the first thermally conductive insulating film 36 covers the outer surface of the positive electrode tab 32 (i.e., the surface of the positive electrode tab 32 away from the resistance layer 31), and the second thermally conductive insulating film 37 covers the outer surface of the negative electrode tab 33 (i.e., the surface of the negative electrode tab 33 away from the resistance layer 31). Therefore, when the heat-generating cavity 12 is ensured to radiate heat outwards, the leakage of electricity in the working process of the PTC thermistor element 3 can be avoided, and the work is stable. When the PTC thermistor components 3 are accommodated in the heat-generating chamber 12, the heat-generating chamber 12 clamps the first and second heat-conductive insulating films 36 and 37.

Preferably, the first and second thermally conductive insulating films 36 and 37 are each composed of one insulating film and one thermally conductive film. The insulating film mainly plays an insulating role and transfers heat to the heat conducting film, and the insulating film can be a polyimide film; the heat conduction membrane plays high-efficient heat conduction's effect, with heat transfer to first heat dissipation cavity 11 and second heat dissipation cavity 13, the heat conduction membrane can be the silicone mould. Further, of the first and second heat-conductive insulating films 36 and 37, the insulating film is closer to the resistive layer 31 than the heat-conductive film. Further preferably, the thickness of the insulating film is 0.05-0.1 mm, and the thickness of the heat conducting film is 0.2-0.8 mm, so that efficient heat conduction is facilitated while insulation is guaranteed.

Specifically, the resistance layer 31 includes a plurality of PTC thermistors 38, and the plurality of PTC thermistors 38 are sequentially arranged in a layer to form a plurality of rows and a plurality of columns; the plurality of PTC thermistors 38 are electrically connected to the positive electrode tab 32 and the negative electrode tab 33, respectively. The number of the PTC thermistors 38 is not limited, and may be set according to actual conditions, and generally, the PTC thermistors may be arranged in a certain area as many as possible. In a preferred embodiment, the number of PTC thermistors 38 in the resistive layer 31 is 44. The thickness of each PTC thermistor 38 should be substantially uniform.

Preferably, the plurality of PTC thermistors 38 of the resistive layer 31 are divided into a plurality of groups. The number of the positive electrode tabs 32 is one, and the number of the negative electrode tabs 33 is the same as the number of the groups of the PTC thermistors 38; each set of PTC thermistors 38 is electrically connected to the positive plate 32, and each set of PTC thermistors 38 is electrically connected to each negative plate 33. Alternatively, the number of the negative electrode tabs 33 is one, and the number of the positive electrode tabs 32 is the same as the number of the groups of the PTC thermistors 38; each group of PTC thermistors 38 is electrically connected to the negative plate 33, and each group of PTC thermistors 38 is electrically connected to each positive plate 32. Alternatively, the number of positive electrode tabs 32 and the number of negative electrode tabs 33 are both the same as the number of groups of PTC thermistors 38; each set of PTC thermistors 38 is electrically connected to each positive plate 32, and each set of PTC thermistors 38 is electrically connected to each negative plate 33. In this way, each set of PTC thermistors 38 can be individually controlled to heat as desired. In the present embodiment, the plurality of PTC thermistors 38 of the resistance layer 31 are divided into 3 groups, the number of positive electrode tabs 32 is one, and the number of negative electrode tabs 33 is three.

Specifically, the PTC thermistor components 3 further include a mounting frame 39 for fixing the PTC thermistor, the mounting frame 39 being partitioned into a plurality of blocks, the PTC thermistor being disposed in the blocks of the mounting frame 39. Preferably, the divided blocks may be strip-shaped blocks arranged in parallel, and each column of the PTC thermistors is arranged in one strip-shaped block. Preferably, the separate blocks may be block blocks, and each PTC thermistor is disposed in one block. It should be understood that the block may be in other forms, and may be divided according to actual requirements. The mounting frame 39 is made of a heat insulating material.

The maximum thickness of the mounting frame 39 after thermal expansion is not greater than the thickness of the resistance layer 31, so as to avoid the positive electrode tab 32 and the negative electrode tab 33 from separating from the resistance layer 31. Preferably, the specific shape structure of the PTC thermistor components 3 can be adjusted according to the layout of the PTC heater. For example, in order to fully exchange heat between the PTC heater and the heat transfer medium, medium passages are opened at two corresponding corners of the first heat dissipation cavity 11 and the second heat dissipation cavity 13, so that the first heat dissipation cavity 11 and the second heat dissipation cavity 13 are communicated, and thus fewer PTC thermistors can be disposed at corresponding positions of the resistance layer 31, so that the resistance layer 31 forms a convex shape. Accordingly, the shapes of the positive electrode tab 32, the negative electrode tab 33, the first insulating heat-conductive film, the second insulating heat-conductive film, and the mounting frame 39 are also adjusted accordingly.

Further, as shown in fig. 6, 7 and 8, the PTC heater provided by the present embodiment includes a first heat dissipation case 41, a second heat dissipation case 42 and a sealing ring. It should be noted that, in the present invention, the upper portion of the first heat dissipation housing 41 is defined as the top portion of the first heat dissipation housing 41, and the lower portion of the first heat dissipation housing 41 is defined as the bottom portion of the first heat dissipation housing 41, so that the front portion, the rear portion, the left portion and the right portion of the first heat dissipation housing 41 form the side portions of the first heat dissipation housing 41, specifically corresponding to the front side portion, the rear side portion, the left side portion and the right side portion of the first heat dissipation housing 41; the lower portion of the second heat dissipation case 42 is defined as the top of the second heat dissipation case 42, and the upper portion of the second heat dissipation case 42 is defined as the bottom of the second heat dissipation case 42, and then the front, rear, left, and right portions of the second heat dissipation case 42 form the side portions of the second heat dissipation case 42, specifically corresponding to the front, rear, left, and right side portions of the second heat dissipation case 42.

Preferably, the bottom of the first heat dissipating housing 41 is fastened to the bottom of the second heat dissipating housing 42 by a sealing ring to form the heat generating cavity 12, the outer side of the first heat dissipating housing 41 is provided with a plurality of first clamping bosses 44, the outer side of the second heat dissipating housing 42 is provided with a plurality of second clamping bosses 45, the second clamping bosses 45 are arranged corresponding to the first clamping bosses 44 according to the position relationship, one first clamping boss 44 and one second clamping boss 45 correspondingly arranged according to the position relationship form a clamping boss pair, and one clamping boss pair is clamped into one clamp 46 to clamp the first heat dissipating housing 41 and the second heat dissipating housing 42. With such an arrangement, the first heat dissipation casing 41 is sealed at the connection position between the sealing ring and the second heat dissipation casing 42, so as to facilitate the sealing of the heat generating cavity 12, and meanwhile, the first heat dissipation casing 41 and the second heat dissipation casing 42 are convenient to detach when necessary, thereby facilitating the maintenance and replacement of the PTC thermistor device 3.

Preferably, the first clamping boss 44 includes a first clamping position 411 and a first blocking position 412 from inside to outside (i.e. from the inside of the heat-generating cavity 12 to the outside of the heat-generating cavity 12), and the first blocking position 412 is higher than the first clamping position 411 in the direction from bottom to top; the second clamping boss 45 comprises a second clamping position 421 and a second blocking position 422 from inside to outside, and the second blocking position 422 is higher than the second clamping position 421 in the direction from top to bottom; when the pair of clamping bosses is snapped into the clamp 46, the clamp 46 is disposed at the first clamping position 411 and the second clamping position 421. The clamping boss arranged in this way can prevent the clamp 46 from slipping off, and ensures stable clamping.

Preferably, the first clamping bosses 44 are evenly distributed around the outer side of the first heat dissipation case 41, and the second clamping bosses 45 are evenly distributed around the outer side of the second heat dissipation case 42. In this way, after the pair of clamping bosses are engaged in the clips 46, the first heat dissipation case 41 and the second heat dissipation case 42 are clamped well.

Further preferably, the first clamping boss 44 and the second clamping boss 45 are both semi-cylindrical, the pair of clamping bosses are cylindrical, and the collar 46 is annular. Accordingly, the first clamping position 411 and the second clamping position 421 are both semi-circular grooves. Of course, it is only preferable to provide both the first clamping boss 44 and the second clamping boss 45 with a semi-cylindrical shape, and it is conceivable to provide the first clamping boss 44 and the second clamping boss 45 with a cubic shape or other shapes, and a similar effect can be achieved.

In the present embodiment, the clip 46 is an open-sided annular elastic clip 46, but may be an elastic clip 46 of other shapes.

It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.

Claims (10)

1. A PTC heater is characterized in that the PTC heater is provided with a heater body,

comprises a controller, a heating box body (1), a sealing plug (2) and a connecting conductor;

the heating box body (1) is internally provided with a first heat dissipation cavity (11), a heat production cavity (12) and a second heat dissipation cavity (13) from top to bottom; the heat-generating cavity (12) is a sealed cavity and contains the PTC thermistor element (3) used for radiating heat to the first heat-radiating cavity (11) and the second heat-radiating cavity (13);

the heat-generating cavity (12) is provided with a connecting channel (14) which is upward and communicated with the outside of the heat-generating cavity (12), and the connecting channel (14) is positioned outside the first heat-radiating cavity (11); a through hole (21) is formed in the sealing plug (2), the connecting conductor penetrates through the through hole (21), the through hole (21) stores force, sealing is formed between the through hole (21) and the connecting conductor, the sealing plug (2) is arranged in the connecting channel (14) in a plugging mode, the sealing plug (2) stores force, and sealing is formed between the sealing plug (2) and the connecting channel (14); the controller is arranged above the heating box body (1) and is electrically connected with the PTC thermistor element (3) through a connecting conductor.

2. The PTC heater according to claim 1,

the PTC thermistor element (3) comprises a resistance layer (31), a positive plate (32) and a negative plate (33), wherein the resistance layer (31) is positioned between the positive plate (32) and the negative plate (33), and the resistance layer (31) is electrically connected with the positive plate (32) and the negative plate (33) respectively;

an upward positive rigid metal sheet (34) is arranged on the positive plate (32) corresponding to the connecting channel (14) and serves as a connecting conductor, and an upward negative rigid metal sheet (35) is arranged on the negative plate (33) corresponding to the connecting channel (14) and serves as a connecting conductor.

3. The PTC heater according to claim 2,

the connecting channel (14) is arranged at the end part of the heat generating cavity (12), the positive rigid metal sheet (34) is positioned at the end part of the positive sheet (32), and the negative rigid metal sheet (35) is positioned at the end part of the negative sheet (33).

4. The PTC heater according to claim 3,

the terminal of the positive electrode sheet (32) protrudes out of the resistance layer (31), and the terminal of the negative electrode sheet (33) protrudes out of the resistance layer (31).

5. The PTC heater according to claim 2,

the positive electrode rigid metal piece (34) and the negative electrode rigid metal piece (35) are aligned in the left-right direction.

6. The PTC heater according to claim 1,

the PTC thermistor element (3) comprises a resistance layer (31), a positive plate (32) and a negative plate (33), wherein the resistance layer (31) is positioned between the positive plate (32) and the negative plate (33);

the resistance layer (31) includes a plurality of PTC thermistors (38), the plurality of PTC thermistors (38) being arranged in sequence in one layer, the plurality of PTC thermistors (38) being divided into a plurality of groups;

the number of the positive plates (32) is one, and the number of the negative plates (33) is the same as the number of the groups of the PTC thermistors (38); each group of PTC thermistors (38) is electrically connected with the positive plate (32), and each group of PTC thermistors (38) is electrically connected with each negative plate (33) respectively; alternatively, the first and second electrodes may be,

the number of the negative electrode plates (33) is one, and the number of the positive electrode plates (32) is the same as the number of the groups of the PTC thermistors (38); each group of PTC thermistors (38) is electrically connected with the negative plate (33), and each group of PTC thermistors (38) is electrically connected with each positive plate (32); alternatively, the first and second electrodes may be,

the number of the positive plates (32) and the number of the negative plates (33) are the same as the number of the groups of the PTC thermistors (38); each group of PTC thermistors (38) is electrically connected with each positive plate (32), and each group of PTC thermistors (38) is electrically connected with each negative plate (33).

7. The PTC heater according to claim 1,

the heat dissipation device also comprises a first heat dissipation shell (41), a second heat dissipation shell (42), a clamp (46) and a sealing ring;

the bottom of first heat dissipation casing (41) passes through the sealing washer lock and forms heat production cavity (12) on the bottom of second heat dissipation casing (42), a plurality of first tight boss (44) of clamp have on the outside portion of first heat dissipation casing (41), a plurality of second clamp are tight boss (45) have on the outside portion of second heat dissipation casing (42), second clamp boss (45) set up according to position relation corresponding to first clamp boss (44), press from both sides tight boss pair according to a first tight boss (44) of clamp and a second clamp that position relation corresponds the setting and press from both sides tight boss (45) and form, a clamp is pressed from both sides tight boss pair and is gone into in a clamp (46), press from both sides tight first heat dissipation casing (41) and second heat dissipation casing (42).

8. The PTC heater according to claim 7,

the first clamping boss (44) comprises a first clamping position (411) and a first blocking position (412) from inside to outside, and the first blocking position (412) is higher than the first clamping position (411) in the direction from bottom to top;

the second clamping boss (45) comprises a second clamping position (421) and a second blocking position (422) from inside to outside, and the second blocking position (422) is higher than the second clamping position (421) in the direction from top to bottom;

when the clamping boss is clamped into the clamp (46), the clamp (46) is sleeved on the first clamping position (411) and the second clamping position (421).

9. The PTC heater according to claim 7,

the first clamping bosses (44) are evenly distributed around the outer side of the first heat-dissipating housing (41), and the second clamping bosses (45) are evenly distributed around the outer side of the second heat-dissipating housing (42).

10. The PTC heater according to claim 7,

the first clamping boss (44) and the second clamping boss (45) are both semi-cylindrical, the pair of clamping bosses is cylindrical, and the hoop (46) is annular.

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