阅读说明：本技术 一种ptc电加热器用汇流板组件 (Bus bar assembly for PTC electric heater ) 是由 丛文豪 常发明 于 2020-04-03 设计创作，主要内容包括：本发明提供一种PTC电加热器用汇流板组件,其解决了现有汇流板为了满足用户加热速度快的需求而汇流板预留的安装空间大大增加的技术问题,其设有汇流板和绝缘盖板,汇流板设有汇流母排和导电连接片,汇流母排设有正极汇流母排和负极汇流母排,正极汇流母排开设第一插孔,负极汇流母排开设第二插孔；导电连接片设有第一导电连接片和第二导电连接片；第一导电连接片与正极汇流母排电连接；第二导电连接片与负极汇流母排电连接；正极汇流母排上开设有安装缺口,负极汇流母排设置在安装缺口内,与负极汇流母排相连接的第二导电连接片的另一端从正极汇流母排的上方或者下方通过后向外延伸。可广泛应用于PTC电加热器技术领域。(The invention provides a bus bar assembly for a PTC electric heater, which solves the technical problem that the installation space reserved by a bus bar is greatly increased in order to meet the requirement of high heating speed of a user by the conventional bus bar; the conductive connecting sheet is provided with a first conductive connecting sheet and a second conductive connecting sheet; the first conductive connecting sheet is electrically connected with the positive bus bar; the second conductive connecting sheet is electrically connected with the negative bus bar; the installation gap is arranged on the positive busbar, the negative busbar is arranged in the installation gap, and the other end of the second conductive connecting sheet connected with the negative busbar extends outwards from the upper part or the lower part of the positive busbar. Can be widely applied to the technical field of PTC electric heaters.)

1. A bus bar assembly for a PTC electric heater is provided with a bus bar, wherein the bus bar is provided with a bus bar and a conductive connecting sheet connected with the bus bar, the bus bar is provided with a positive bus bar and a negative bus bar, and the positive bus bar and the negative bus bar are completely isolated; the PTC heating device is characterized in that the positive busbar is provided with a first jack for the plug-in type electric connection of a positive terminal of a PTC heating pack, and the negative busbar is provided with a second jack for the plug-in type electric connection of a negative terminal of the PTC heating pack; the conductive connecting sheet is provided with a first conductive connecting sheet and a second conductive connecting sheet; one end of the first conductive connecting sheet is electrically connected with the positive busbar, and the other end of the first conductive connecting sheet extends outwards and is used for being electrically connected with the positive end of a current output circuit of the PTC controller; one end of the second conductive connecting sheet is electrically connected with the negative bus bar, and the other end of the second conductive connecting sheet extends outwards and is used for being electrically connected with the negative end of the current input circuit of the PTC controller; the positive bus bar is provided with an installation gap, the installation gap is provided with a longitudinal through groove and a longitudinal through hole, the side surface of the edge of the positive bus bar is provided with the longitudinal through groove, and the interior of the positive bus bar is provided with the longitudinal through hole; the negative bus bar is arranged in the mounting notch, each negative bus bar is connected with one second conductive connecting piece, and the other end of the second conductive connecting piece connected with the negative bus bar extends outwards from the upper part or the lower part of the positive bus bar after passing through the second conductive connecting piece.

2. A busbar assembly according to claim 1, wherein said positive busbar is provided in number of one, and one negative busbar is provided for each of said mounting notches.

3. A bus bar assembly for a PTC electrical heater according to claim 2, wherein the other end of each of the second conductive connecting pieces extends in substantially the same direction; when the second conductive connecting sheet extends outwards and is blocked by the position of the positive bus bar, the second conductive connecting sheet turns to bypass the positive bus bar and then continues to extend outwards.

4. A bus bar assembly for a PTC electric heater according to claim 3, wherein the other end of the first conductive connecting piece extends in substantially the same direction as the other end of the second conductive connecting piece, and the end of the other end of the first conductive connecting piece and the end of the other end of the second conductive connecting piece are substantially on the same horizontal plane.

5. A busbar assembly according to claim 1, wherein said positive busbar and said first conductive tab connected thereto are of unitary construction; the negative bus bar and the second conductive connecting sheet connected with the negative bus bar are of an integral structure.

6. A bus bar assembly for an electric PTC heater according to any one of claims 1-5, wherein a plurality of first spring tongues for inserting the positive terminal of the PTC heating pack are provided at the edges of the first insertion holes; and a plurality of second spring tongues used for being inserted into the negative terminal of the PTC heating bag are arranged at the edge of the second jack.

7. A bus bar assembly for a PTC electric heater according to any of claims 1-5, further comprising an insulating cover plate for use with the bus bar for a PTC electric heater, wherein the insulating cover plate is provided on both the upper and lower surfaces of the bus bar for electrical insulation; the insulating cover plate is provided with an upper insulating cover plate and a lower insulating cover plate, the upper insulating cover plate is arranged on the upper surface of the bus bar, the lower insulating cover plate is arranged on the lower surface of the bus bar, and the upper insulating cover plate and the lower insulating cover plate are connected in a matched mode through a buckle; the positive bus bar and the negative bus bar are provided with first through holes, and the buckle penetrates through the first through holes; the upper insulating cover plate is provided with a second through hole for the positive terminal or the negative terminal of the PTC heating bag to pass through, and the lower insulating cover plate is provided with a third through hole for the positive terminal or the negative terminal of the PTC heating bag to pass through; in a space region where the positive bus bar is located, the second through hole and the third through hole are arranged opposite to the first jack up and down; and the second through hole, the third through hole and the second jack are arranged oppositely up and down in the space area where the negative bus bar is located.

8. A bus bar assembly for a PTC electrical heater according to claim 7, wherein the lower insulating cover plate is provided with a positioning plate in connection therewith, the positioning plate being disposed between the upper insulating cover plate and the lower insulating cover plate; the positioning plate is provided with a concave through groove, and the second conductive connecting sheet is arranged in the concave through groove.

9. A busbar assembly according to claim 7, wherein the lower insulating cover plate is provided with locating grooves adapted to the positive busbar and the negative busbar.

10. A bus bar assembly for an electrical PTC heater according to claim 7, wherein said upper insulating cover has a guiding hole, said lower insulating cover has a guiding post, and said guiding post is connected to said guiding hole.

Technical Field

The invention relates to the technical field of PTC electric heaters, in particular to a bus plate component for a PTC electric heater.

Background

The PTC (Positive Temperature coefficient) heater is a PTC heater. The PTC heater has the characteristics of high starting speed, good temperature controllability, ideal working reliability, energy conservation, long service life and the like, so the PTC heater is widely used as an electric heating element for manufacturing various electric heating appliances such as an air conditioner, a heater, a clothes dryer, a dish washing machine, a water heater, a food processor, a heating floor cleaning machine and the like, and even used as an important part of a control and protection device such as a current limiter, a filter protector, an overload protector, a demagnetization controller, a starting controller and the like. At present, PTC heaters are often deployed on new energy electric vehicles for battery thermal management and air conditioning heating. At present, in the field of new energy automobiles, certain heat is needed for comfort of carriages in winter and charge and discharge of power batteries, an electric heating system is needed for heating due to the fact that the existing electric automobiles lack the waste heat of engines of traditional automobiles, and a PTC heater is an ideal choice. The PTC heating pack is a very important heating element in the PTC heater, and includes a positive electrode tab, a negative electrode tab, a PTC resistor sheet interposed between the positive and negative electrode tabs, and the like. Because the PTC heater needs to output power of different gears, the PTC heating pack groups are divided into a plurality of groups and are controlled by the PTC controller, so that circuit switching is difficult to complete in a small space, and a junction plate is needed to complete the electricity connection of different series PTC heating pack groups; the PCB board in the PTC controller is electrically connected with the PTC heating package through the bus board, wherein the bus board plays a very important role in electric connection and switching between the PTC controller and the PTC heating package.

Along with the sustainable development of new energy automobile technology, the user also becomes higher and higher to the requirement of PTC heater, in order to satisfy the fast demand of user's rate of heating, the PTC heater needs to promote output power, consequently need increase the quantity of PTC heating package, and then increase the area of cylinder manifold, for example promote output power from 5 kilowatts to 1 ten thousand watts, the quantity of PTC heating package often needs to increase 1 time, corresponding current cylinder manifold needs to increase 1 time on the basis of original area, cause the installation space greatly increased that the PTC heater reserved for the cylinder manifold.

Disclosure of Invention

The invention aims to solve the technical defects and provide the bus plate assembly for the PTC electric heater, so that the reserved installation space of the bus plate is reduced, and the requirement of high heating speed of a user is met.

Therefore, the invention provides a bus bar assembly for a PTC electric heater, which is provided with a bus bar, wherein the bus bar is provided with a bus bar and a conductive connecting sheet connected with the bus bar, the bus bar is provided with a positive bus bar and a negative bus bar, and the positive bus bar and the negative bus bar are completely isolated; the positive busbar is provided with a first jack for the plug-in type electric connection of a positive terminal of the PTC heating bag, and the negative busbar is provided with a second jack for the plug-in type electric connection of a negative terminal of the PTC heating bag; the conductive connecting sheet is provided with a first conductive connecting sheet and a second conductive connecting sheet; one end of the first conductive connecting sheet is electrically connected with the positive busbar, and the other end of the first conductive connecting sheet extends outwards and is used for being electrically connected with the positive end of the current output circuit of the PTC controller; one end of the second conductive connecting sheet is electrically connected with the negative bus bar, and the other end of the second conductive connecting sheet extends outwards and is used for being electrically connected with the negative end of the current input circuit of the PTC controller; the positive bus bar is provided with an installation gap, the installation gap is provided with a longitudinal through groove and a longitudinal through hole, the side surface of the edge of the positive bus bar is provided with the longitudinal through groove, and the interior of the positive bus bar is provided with the longitudinal through hole; the negative bus bar is arranged in the mounting notch, each negative bus bar is connected with a second conductive connecting piece, and the other end of the second conductive connecting piece connected with the negative bus bar extends outwards from the upper part or the lower part of the positive bus bar.

Preferably, the number of the positive bus bars is set to be one, and each installation notch is provided with one negative bus bar.

Preferably, the other end of each second conductive connecting piece extends in substantially the same direction; when the second conductive connecting sheet extends outwards and is blocked by the position of the positive bus bar, the second conductive connecting sheet turns around the positive bus bar and continues to extend outwards.

Preferably, the extending direction of the other end of the first conductive connecting sheet is substantially the same as the extending direction of the other end of the second conductive connecting sheet, and the end of the other end of the first conductive connecting sheet and the end of the other end of the second conductive connecting sheet are substantially on the same horizontal plane.

Preferably, the positive bus bar and the first conductive connecting sheet connected with the positive bus bar are of an integral structure; the negative bus bar and the second conductive connecting sheet connected with the negative bus bar are of an integral structure.

Preferably, a plurality of first spring tongues for inserting the positive terminal of the PTC heating pack are arranged at the edges of the first jacks; the edge of the second jack is provided with a plurality of second spring tongues for plugging the negative terminal of the PTC heating bag.

Preferably, the PTC electric heater is also provided with an insulating cover plate, the insulating cover plate is matched with a bus plate for the PTC electric heater, and the upper surface and the lower surface of the bus plate are respectively provided with the insulating cover plate for electrical insulation; the insulating cover plate is provided with an upper insulating cover plate and a lower insulating cover plate, the upper insulating cover plate is arranged on the upper surface of the bus bar, the lower insulating cover plate is arranged on the lower surface of the bus bar, and the upper insulating cover plate and the lower insulating cover plate are connected in a matched mode through a buckle; the positive bus bar and the negative bus bar are both provided with first through holes, and the buckles penetrate through the first through holes; the upper insulating cover plate is provided with a second through hole for the positive terminal or the negative terminal of the PTC heating bag to pass through, and the lower insulating cover plate is provided with a third through hole for the positive terminal or the negative terminal of the PTC heating bag to pass through; in the space area where the positive bus bar is located, the second through hole, the third through hole and the first jack are arranged in an up-down opposite mode; and in the space area where the negative bus bar is located, the second through hole, the third through hole and the second jack are arranged up and down oppositely.

Preferably, the lower insulating cover plate is connected with a positioning plate, and the positioning plate is arranged between the upper insulating cover plate and the lower insulating cover plate; the positioning plate is provided with a concave through groove, and the second conductive connecting sheet is arranged in the concave through groove.

Preferably, the lower insulating cover plate is provided with positioning grooves matched with the positive busbar and the negative busbar.

Preferably, the upper insulating cover plate is provided with a guide hole, the lower insulating cover plate is connected with a guide post, and the guide post is in adaptive connection with the guide hole.

The invention has the beneficial effects that: the invention provides a bus plate component for a PTC electric heater, which is novel in design, simple and reasonable in structure and remarkable in technical effect. The method is mainly characterized in the following three aspects:

firstly, a circuit channel of the positive bus bar is naturally formed between two adjacent installation gaps, so that more paths are provided for current to reach the positive terminal of each PTC heating package through the positive bus bar, the time is shorter, and the requirement of the current amount required by heating of each PTC heating package is met.

And secondly, the negative bus bar is arranged in the mounting notch of the positive bus bar, particularly in the longitudinal through hole, compared with the existing bus plate, the positive bus bar and the negative bus bar of the bus plate are more compactly arranged in the whole structure, and the selection of the plugging position of the PTC heating packs and the bus plate is more flexible, so that the PTC heating packs are more compactly arranged, and the mounting space reserved for the bus plate by the PTC heater is effectively reduced on the whole.

And the other end of the second conductive connecting sheet connected with the negative bus bar extends outwards from the upper part or the lower part of the positive bus bar, the area occupied by the second conductive connecting sheet on the existing bus bar is reduced through the overhead structure design, and the installation space reserved for the bus bar by the PTC heater is effectively reduced.

Drawings

FIG. 1 is a schematic structural view of a bus bar of the present invention;

FIG. 2 is a schematic structural view of the perspective view shown in FIG. 1;

fig. 3 is a schematic structural view of the positive bus bar in fig. 1;

FIG. 4 is a schematic structural view of the perspective view shown in FIG. 3;

FIG. 5 is a schematic view of the structure of the lower insulating cover plate of the present invention;

FIG. 6 is a schematic structural view of the perspective view shown in FIG. 5;

fig. 7 is a schematic view of the structure of the bus bar of the present invention mounted on the lower insulating cover plate;

FIG. 8 is a schematic structural view of the perspective view shown in FIG. 7;

FIG. 9 is a schematic structural view of an upper insulating cover plate according to the present invention;

FIG. 10 is a schematic structural view of the perspective view shown in FIG. 9;

FIG. 11 is a schematic structural view of the present invention;

FIG. 12 is a schematic structural view of the perspective view shown in FIG. 11;

FIG. 13 is a schematic diagram of the structure of the exploded view shown in FIG. 11;

fig. 14 is a schematic structural view of an exploded view of the sectional view a-a shown in fig. 11;

fig. 15 is a structural view of an exploded view of the B-B sectional view shown in fig. 11.

The labels in the figure are: 1. the structure of the bus bar comprises a bus bar body, 2 conductive connecting pieces, 3 mounting notches, 4 positioning plates, 5 concave through grooves, 6 positioning grooves, 7 guide holes, 8 guide posts, 9 elastic clamping pieces, 10 clamping holes, 11 positive electrode bus bars, 12 negative electrode bus bars, 13 gaps, 21 first conductive connecting pieces, 22 second conductive connecting pieces, 31 longitudinal through grooves, 32 longitudinal through holes, 41 first jacks, 42 second jacks, 51 first spring tongues, 52 second spring tongues, 61 upper insulating cover plates, 62 lower insulating cover plates, 71 first through holes, 72 second through holes and 73 third through holes.

Detailed Description

The invention is further described below in conjunction with the drawings and the specific embodiments to assist in understanding the contents of the invention. The method used in the invention is a conventional method if no special provisions are made; the raw materials and the apparatus used are, unless otherwise specified, conventional commercially available products.

As shown in fig. 1 to 4, the present invention provides a busbar assembly for a PTC electrical heater, which comprises a busbar, wherein the busbar is provided with a busbar 1 and a conductive connecting sheet 2 connected with the busbar 1, the busbar 1 is provided with a positive busbar 11 and a negative busbar 12, and the positive busbar 11 and the negative busbar 12 are completely isolated from each other; usually, according to actual conditions, the positive bus bar 11 and the negative bus bar 12 are separated by a gap 13 with a proper width to form an air resistor, so as to prevent short circuit between the positive bus bar 11 and the negative bus bar 12. The positive busbar 11 is provided with a first jack 41 for the plug-in type electric connection of a positive terminal of the PTC heating pack, and the negative busbar 12 is provided with a second jack 42 for the plug-in type electric connection of a negative terminal of the PTC heating pack; each PTC heating package is provided with a positive terminal and a negative terminal, the positive terminal of the PTC heating package is inserted into the first jack 41 in a matching manner to be electrically connected, and the negative terminal of the PTC heating package is inserted into the second jack 42 in a matching manner to be electrically connected, so that the PTC heating package is convenient to mount and dismount; on the other hand, the risk that the traditional soldering tin connection has tin melting at high temperature is effectively avoided.

As shown in fig. 1 and 2, the conductive connecting piece 2 is provided with a first conductive connecting piece 21 and a second conductive connecting piece 22; the first conductive connection pad 21 and the second conductive connection pad 22 are both conductive materials, and may be metal conductive materials, typically copper, aluminum or alloys thereof. One end of the first conductive connecting sheet 21 is electrically connected with the positive busbar 11, and the other end of the first conductive connecting sheet 21 extends outwards and is used for being electrically connected with the positive end of a current output circuit of the PTC controller; one end of the second conductive connecting sheet 22 is electrically connected with the negative bus bar 12, and the other end of the second conductive connecting sheet 22 extends outwards and is used for being electrically connected with the negative end of the current input circuit of the PTC controller; the PTC controller is a commercially available device and is electrically connected with the PTC heating package through a bus bar 1 of the bus plate, wherein the bus bar 1 of the bus plate plays a role in circuit switching, and the PTC heating package generates heat after being electrified.

As shown in fig. 3 and 4, an installation notch 3 is formed in the positive bus bar 11, the installation notch 3 is provided with a longitudinal through groove 31 and a longitudinal through hole 32, and a longitudinal through groove 31 is formed in a side surface at the edge of the positive bus bar 11; a longitudinal through hole 32 is formed inside the positive bus bar 11, a longitudinal through groove 31 is formed on each of the left and right sides of the positive bus bar 11, and three longitudinal through holes 32 are formed in the positive bus bar 11 at intervals. Referring to fig. 1 and 2, the negative bus bar 12 is disposed in the mounting notch 3, each negative bus bar 12 is connected to a second conductive connecting piece 22, and the other end of the second conductive connecting piece 22 connected to the negative bus bar 12 extends outward from the upper or lower side of the positive bus bar 11 for electrically connecting to the negative end of the current input circuit of the PTC controller.

The invention has novel design, simple and reasonable structure and obvious technical effect, meets the requirement of effectively reducing the installation space reserved for the bus board by the PTC heater, and is mainly embodied in the following three aspects:

firstly, a circuit channel of the positive busbar 11 is naturally formed between two adjacent installation gaps 3, so that more paths of current passing through the positive busbar 11 and reaching the positive terminal of each PTC heating package are obtained, the time is shorter, the requirement of the current capacity required by the heating of each PTC heating package is met, the defect that the current capacity required by the heating of each PTC heating package cannot be fully met when the number of the PTC heating packages is increased because the current of the conventional busbar structure reaches the far end from the near end of the positive busbar 11 and sequentially passes through the positive terminal of each PTC heating package is overcome.

Secondly, the negative bus bar 12 is arranged in the mounting notch 3 of the positive bus bar 11, especially in the longitudinal through hole 32, compared with the existing bus board, the overall structure arrangement of the positive bus bar 11 and the negative bus bar 12 of the bus board is more compact, the selection of the insertion position of the positive terminal and the negative terminal of each PTC heating pack on the bus board is more flexible, the PTC heating packs are more compactly arranged, and the mounting space reserved for the bus board by the PTC heater is effectively reduced on the whole.

Thirdly, the other end of the second conductive connecting piece 22 connected with the negative bus bar 12 extends outwards from the upper part or the lower part of the positive bus bar 11, and through the design of an overhead structure, the area occupied by the second conductive connecting piece 22 on the existing bus bar is reduced, and the installation space reserved for the bus bar by the PTC heater is effectively reduced.

In conclusion, the special structural design has obvious technical effect, meets the requirement of effectively reducing the installation space reserved for the bus board by the PTC heater, simultaneously makes the manufacture and the installation more convenient, effectively improves the production efficiency and reduces the labor cost. Through practical inspection, the output power of the PTC heater is increased from 5 kilowatts to 1 kilowatt, the number of the PTC heating packs needs to be increased by 1 time, the existing bus board needs to be increased by 1 time on the basis of the original area, and the bus board only needs to be increased by 0.5 time on the basis of the original area, so that the installation space of the PTC heater reserved for the bus board is greatly reduced.

As a preferred embodiment, as shown in fig. 1 to 4, the number of the positive bus bars 11 is set to be one, and the number of the positive bus bars is changed from a plurality of the prior art to one of the present invention, so that the installation space of the PTC heater reserved for the bus bars is effectively reduced; each mounting notch 3 is provided with one negative bus bar 12, so that the number of the second conductive connecting pieces 22 is reduced, and the structure of the invention is simpler.

As shown in fig. 1 and 2, the other end of each second conductive connecting piece 22 preferably extends in substantially the same direction, i.e., in substantially the same direction, so that the second conductive connecting pieces 22 do not interfere with each other and are easy to assemble, and the second conductive connecting pieces 22 are easy to check for assembly errors in a short time due to the design of the second conductive connecting pieces. When the second conductive connecting piece 22 extends outwards and is blocked by the position of the positive bus bar 11, the second conductive connecting piece 22 turns to and bypasses the positive bus bar 11 and then extends outwards continuously, and when the positive bus bar 11 and the negative bus bar 12 are generally positioned on the same horizontal plane, a situation that one end of the second conductive connecting piece 22 is connected with the negative bus bar 12 and the other end of the second conductive connecting piece 22 extends outwards and is blocked by the position of the positive bus bar 11 occurs, at this time, in order to completely isolate the second conductive connecting piece 22 from the positive bus bar 11 and prevent short circuit, an overhead structure design is adopted for the second conductive connecting piece 22, and the second conductive connecting piece extends outwards continuously after bypassing the positive bus bar 11, which can be detailed in fig. 2.

As shown in fig. 1 and 2, the other end of the first conductive connecting piece 21 preferably extends in substantially the same direction as the other end of the second conductive connecting piece 22, and the end of the other end of the first conductive connecting piece 21 is preferably substantially flush with the end of the other end of the second conductive connecting piece 22. On one hand, the structure design makes the invention simpler and more reasonable, and the production and the installation are convenient; on the other hand, the error-proof design facilitates the detection of the error in the assembly of the first conductive connecting piece 21 and the second conductive connecting piece 22 in a short time.

As shown in fig. 3 and 4, the positive bus bar 11 and the first conductive connecting piece 21 connected thereto are preferably integrated; as shown in fig. 1 and 2, the negative bus bar 12 and the second conductive connecting piece 22 connected thereto are an integral structure. The problem that the bus bar 1 and the conductive connecting sheet 2 are split and separated in the use process of the conventional bus bar is solved, and in addition, the bus bar is more convenient to produce and install, and the working efficiency is improved.

As shown in fig. 1 to 4, in order to facilitate the positive terminal and the negative terminal of the PTC heating pack to be plugged onto the bus bar more firmly and ensure the stability of the electrical connection, a plurality of first spring tongues 51 (see fig. 3 and 4 for details) for plugging the positive terminal of the PTC heating pack are respectively disposed at the edge of the first insertion hole 41 of the positive bus bar 11; a plurality of second spring tongues 52 (see fig. 1 and 2 in detail) for plugging the negative terminal of the PTC heating pack are disposed at the edge of the second insertion hole 42 of the negative bus bar 12. The first spring tongue 51 and the second spring tongue 52 are both spring tongues, belong to the existing structural device, and are used for clamping and limiting the positive terminal and the negative terminal of the PTC heating bag, so that the connection is firmer and more stable.

As a preferred embodiment, as shown in fig. 11 to 15, the present invention further includes an insulating cover plate, the insulating cover plate is used in combination with the bus plate for the PTC electric heater, and the bus plate is provided with insulating cover plates for electrical insulation on both the upper and lower surfaces thereof; usually, the insulating cover plate is made of insulating rubber and plastic materials, the bus bar 1 of the bus bar plate is electrically insulated, the anti-vibration capability is improved, and the service life of the bus bar plate is prolonged. The insulating cover plate is provided with an upper insulating cover plate 61 and a lower insulating cover plate 62, the upper insulating cover plate 61 is arranged on the upper surface of the bus bar 1 of the bus bar in a matching manner, the lower insulating cover plate 62 is arranged on the lower surface of the bus bar 1 of the bus bar in a matching manner, and the bus bar 1 of the bus bar is arranged between the upper insulating cover plate 61 and the lower insulating cover plate 62 in a matching manner; generally, one end of the first conductive connecting piece 21 and the second conductive connecting piece 22, which is used for electrically connecting the PTC controller, extends out of the upper insulating cover plate 61 and the lower insulating cover plate 62, so as to be conveniently plugged with the PTC controller. The upper insulating cover plate 61 and the lower insulating cover plate 62 are connected in a matched mode through a buckle; as shown in fig. 1 to 4, the positive busbar 11 and the negative busbar 12 are both provided with a first through hole 71, and the upper insulating cover plate 61 and the lower insulating cover plate 62 are connected in a matching manner by a buckle passing through the first through hole 71; the snap fit connection is a conventional connection mode, and as shown in fig. 5 and 6, two elastic clamping pieces 9 which are oppositely bent are generally connected to the lower insulating cover plate 62; as shown in fig. 9 and 10, the upper insulating cover 61 is provided with a card hole 10 corresponding to the elastic card 9 up and down; as shown in fig. 11 and 12, the elastic card 9 passes through the first through hole 71 and then is adapted to be fastened in the card hole 10 of the upper insulating cover plate 61, so that on one hand, the upper insulating cover plate 61 and the lower insulating cover plate 62 are convenient to mount and dismount, and on the other hand, the positive bus bar 11 and the negative bus bar 12 are convenient to limit, and the phenomenon of short circuit caused by offset contact in the using process is avoided. As shown in fig. 9 and 10, the upper insulating cover plate 61 is provided with a second through hole 72 for passing through the positive terminal or the negative terminal of the PTC heating pack; as shown in fig. 5 and 6, the lower insulating cover 62 is provided with a third through hole 73 through which the positive electrode terminal or the negative electrode terminal of the PTC heating pack passes. As shown in fig. 13, in the spatial region where the positive bus bar 11 is located, the second through hole 72 and the third through hole 73 are disposed opposite to the first through hole 41, the positive terminal of the PTC heating pack sequentially passes through the third through hole 73, the first through hole 41 and the second through hole 72 from bottom to top, wherein the positive terminal of the PTC heating pack is electrically connected to the positive bus bar 11 through the first through hole 41, and the second through hole 72 and the third through hole 73 cooperate to position and guide the positive terminal of the PTC heating pack. In the space area where the negative bus bar 12 is located, the second through hole 72, the third through hole 73 and the second jack 42 are arranged in an up-down opposite mode, the negative terminal of the PTC heating pack sequentially penetrates through the third through hole 73, the second jack 42 and the second through hole 72 from bottom to top, wherein the negative terminal of the PTC heating pack is electrically connected with the negative bus bar 12 through the second jack 42, and the second through hole 72 and the third through hole 73 cooperatively play a role in positioning and guiding the negative terminal of the PTC heating pack.

As shown in fig. 5 to 8, 13 and 15, the positioning plate 4 is connected to the lower insulating cover plate 62, and the positioning plate 4 is disposed between the upper insulating cover plate 61 and the lower insulating cover plate 62; a concave through groove 5 is arranged on the positioning plate 4, and the second conductive connecting sheet 22 is arranged in the concave through groove 5; the positioning plate 4 is used for fixing and limiting the second conductive connecting sheet 22, and the phenomenon that the second conductive connecting sheet 22 is deviated in the use process and is in contact with the positive bus bar 11 to cause short circuit is avoided.

As shown in fig. 5 to 8, the lower insulating cover plate 62 is preferably provided with a positioning groove 6 adapted to the shape of the positive busbar 11 and the negative busbar 12, so as to fix and limit the positive busbar 11 and the negative busbar 12, and prevent short circuit caused by offset contact in the using process; on the other hand, the installation of the positive busbar 11 and the negative busbar 12 is convenient, time and labor are saved, and the production efficiency is improved.

As shown in fig. 9, 10, and 13, the upper insulating cover plate 61 is preferably provided with a guide hole 7; as shown in the figures 5, 6 and 13, the lower insulating cover plate 62 is connected with the guide posts 8, the guide posts 8 are connected with the guide holes 7 in an adaptive mode, the upper insulating cover plate 61 and the lower insulating cover plate 62 are aligned and installed conveniently, time and labor are saved, and production efficiency is improved.

In the description of the present invention, it is to be understood that the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. It should be noted that, in the above-mentioned embodiments, the terms "first", "second" and "third" do not represent absolute differences in structure and/or function, nor represent a sequential order of execution, but merely serve to facilitate description.

However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.