CN219164966U - PCB positioning structure of power device, power device and new energy automobile - Google Patents

Abstract

The utility model provides a PCB positioning structure of a power device, the power device and a new energy automobile, wherein the PCB positioning structure of the power device comprises a heat dissipation bottom shell provided with a tooling limiting structure; the fixture locating plate is provided with a locating structure matched with the fixture locating structure, is correspondingly matched and located and installed on the heat dissipation bottom shell through the locating structure and the fixture locating structure, and is provided with a terminal locating groove opposite to the corresponding side wall of the heat dissipation bottom shell at the periphery; the PCB board, its working face top edge interval sets up a plurality of signal terminal, and a plurality of signal terminal's extension distance and the length phase-match of terminal spacing groove, and PCB board is installed in the heat dissipation drain pan through its cooling surface and the cooperation location of corresponding lateral wall surface, signal terminal and terminal spacing groove. The PCB positioning structure of the power device can enable the PCB to be accurately positioned and assembled with the main board and the shell of the power device, realize rapid heat dissipation and stable communication, and reduce the finish machining cost of the shell.

Description

PCB positioning structure of power device, power device and new energy automobile

Technical Field

The utility model relates to the technical field of power devices of new energy automobiles, in particular to a PCB positioning structure of a power device, the power device and a new energy automobile, which are particularly suitable for an electric automobile vehicle-mounted charger.

Background

Along with the progress of science and technology, new energy automobiles, particularly electric automobiles and the matched automobile electronic industry are also greatly developed, and electronic products equipped with various new energy automobiles are also required to be lighter, thinner, shorter, smaller and higher in density along with the increasing various demands of people, and the requirements of improving the heat dissipation performance, reducing the cost and the like are met.

For the charger carried by the electric automobile in the new energy automobile, the electric automobile is fully charged for more than ten hours from the beginning of development, only 8-10 hours in recent years, and then the current super fast charging only needs less than half an hour, so that the electric automobile can be charged and can travel for hundreds of kilometers, which means that the working power, voltage and current of the charging pile and the vehicle-mounted charger are rapidly improved in the technical field of the electric automobile, for example, the power of some super fast charging piles can reach 40kw, and the power of some large mechanical equipment processing machine tools, for example, the power of a certain planer is 55kw, and the charging pile is used as a small charging equipment, and the volume of the charging equipment is greatly different from that of the planer serving as the large mechanical equipment, so that the improvement of the charging power is obvious.

In order to realize larger charging power, the heating value of the power device is necessarily larger, and the heat dissipation of the power device is also required to be synchronously accelerated. At present, a water-cooled heat dissipation structure is almost commonly adopted by a power device matched with a vehicle-mounted charger in the field of electric automobiles. Since the vehicle-mounted battery charger is built in the vehicle body and is usually mounted in front of the vehicle body, miniaturization of the power device of the vehicle-mounted battery charger is a necessary development trend for facilitating the mounting in the vehicle. In order to achieve fast heat dissipation and miniaturization, a high-efficiency heat dissipation structure is needed to be provided for the power device, and the space inside the shell of the whole system of the power device can be fully utilized, wherein one heat dissipation structure is to integrally weld the power device with high heat generation on one printed circuit board (namely, the power board), a main board (generally one or a plurality of printed circuit boards) of the whole system of the power device is communicated with each independent power board through a signal terminal (namely, a connector with a connecting pin for transmitting an electric signal), and each power board is connected with the outer wall of a water cooling channel arranged on the shell through heat conducting glue or silicone grease and other heat conducting materials, so that the heat generated by the power device is dissipated to the external environment through the printed circuit board, the heat conducting materials, the water cooling channel and the shell to achieve heat dissipation.

The contact layout of the power plate and the outer wall of the water cooling channel is mainly divided into two main types of transverse placement and vertical placement, wherein the transverse placement of the heat dissipation layout is very precious for most electric automobiles due to the fact that the transverse space is very precious, and therefore the heat dissipation layout cannot meet the requirement of miniaturization of the heat dissipation structure of the power device. While vertically placed heat dissipating layouts currently still suffer from the following drawbacks: if screw positioning is adopted, a transverse screw fixing hole is difficult to set for a narrow in-vehicle installation space; if the positioning column in the X/Y direction (i.e., the horizontal direction) is used for positioning (as shown in fig. 1), the positioning column formed by the mold is difficult to achieve higher positioning accuracy (less than 0.5 mm), so that the precision positioning column in the horizontal direction usually needs to be formed integrally with the casing by the mold and then finish the inner side, and the processing difficulty and the cost in the limited space inside the casing are high. If the fine positioning groove is used for positioning, the power board is contacted with the casing through heat conducting materials such as heat conducting glue or silicone grease, and the heat conducting materials generally have certain vertical flow property, so that the thickness of the heat conducting materials cannot be quite thick (generally within 500 micrometers), and therefore two sides of the fine positioning groove matched with the fine positioning column are required to be processed to be vertical to the surface of the casing (as shown in fig. 2), and additional fine processing cost is increased.

Therefore, the PCB of the power device of the vehicle-mounted charger in the prior art is difficult to realize accurate positioning assembly between the limited vehicle-mounted space and the radiating water channel, and the positioning piece is high in finish machining cost, so that the technical problem to be solved in the field is urgent.

Disclosure of Invention

The utility model provides a PCB positioning structure of a power device of a vehicle-mounted charger of an electric automobile, the power device and a new energy automobile, which are particularly suitable for solving the technical problems that the PCB of the power device of the vehicle-mounted charger in the prior art is difficult to realize accurate positioning assembly between a limited vehicle-mounted mounting space and a radiating water channel and the positioning piece is high in finish machining cost.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a PCB positioning structure of a power device, which comprises:

the heat dissipation bottom shell is provided with a plurality of tooling limiting structures;

the tool positioning plate is provided with a plurality of positioning structures matched with the tool limiting structures, the tool positioning plate is positioned and installed at the top end of the heat dissipation bottom shell in a one-to-one corresponding matching manner through the plurality of positioning structures and the plurality of tool limiting structures, and at least one terminal limiting groove opposite to the corresponding side wall of the heat dissipation bottom shell is formed in the periphery of the tool positioning plate;

at least one PCB board, the linear interval in working face top edge of PCB board sets up a plurality of signal terminals, and the linear extension distance of a plurality of signal terminals matches with the extension length phase-match of terminal spacing groove, and the PCB board passes through the cooperation location of the heat dissipation face of PCB board back to working face and the surface of the lateral wall that corresponds, signal terminal and terminal spacing groove and installs on the heat dissipation drain pan.

Further, at least one PCB limit groove is formed in the outer surface of the side wall of at least one side of the heat dissipation bottom shell, and the at least one terminal limit groove is opposite to the corresponding PCB limit groove;

the PCB board is installed in the corresponding PCB limiting groove through the cooperation location of the heat radiating surface of PCB board back facing working surface and the bottom surface of corresponding PCB limiting groove, the week side of PCB board and the week side of corresponding PCB limiting groove, corresponding signal terminal and terminal limiting groove.

Preferably, the edge of the top end of the working face is provided with at least one terminal fixing frame, the terminal fixing frame is provided with a plurality of fixing holes matched with the appearance of the signal terminals, and the signal terminals penetrate through the corresponding fixing holes to fix the leading-out directions of the signal terminals relative to the PCB.

Preferably, the heat dissipation drain pan is rectangle heat dissipation drain pan, and the frock locating plate is the rectangular plate, and one side of frock locating plate is equipped with spacing arch, and spacing bellied both ends correspond respectively and are equipped with two terminal spacing grooves, and the lateral wall surface of the just protruding one side of spacing of heat dissipation drain pan is equipped with the support boss, is close to spacing bellied one end location butt in spacing arch and support between the boss.

Preferably, the other opposite side of the tooling positioning plate is provided with another terminal limiting groove.

Preferably, the tooling limiting structure is a plurality of limiting columns arranged on the bottom wall of the periphery side of the side wall of the heat dissipation bottom shell, and limiting holes are formed in the top ends, far away from the bottom wall, of the limiting columns;

the locating structure is a locating hole matched with the limiting hole, and the tool locating plate is located and installed at the top end of the heat dissipation bottom shell in a one-to-one corresponding mode through a plurality of screws, a plurality of locating holes and a plurality of limiting holes.

Preferably, a heat conducting layer made of heat conducting materials is filled between the heat radiating surface and the bottom surface of the PCB limiting groove.

The utility model also provides a power device, which comprises a main board, and the PCB positioning structure of the power device, wherein the main board is arranged at the top end of the heat dissipation bottom shell and is connected with the signal terminal.

Preferably, the power device is a vehicle-mounted charger, a water cooling channel is arranged at the top end of the side wall of the periphery side of the heat dissipation bottom shell, and a water inlet and a water outlet which are respectively correspondingly communicated with two ends of the water cooling channel are arranged at the side wall of one end of the heat dissipation bottom shell.

The utility model also provides a new energy automobile, and the whole automobile system of the new energy automobile comprises the power device.

Compared with the prior art, the PCB positioning structure of the power device can accurately position and assemble the PCBA of the power device such as the vehicle-mounted charger by using the tool, so that the PCBA can be accurately positioned and assembled with the main board and the shell of the power device, and the quick heat dissipation and stable electrical communication performance of the PCBA can be realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an assembly schematic diagram of a PCB positioning structure of a conventional power device employing a fine positioning column;

fig. 2 is an assembly schematic diagram of a PCB positioning structure of a conventional power device employing a fine positioning groove;

fig. 3 is an assembled perspective view of an embodiment of a PCB positioning structure of a power device of the present utility model;

fig. 4 is an assembled front view of an embodiment of a PCB positioning structure of a power device of the present utility model;

fig. 5 is an assembled side view of an embodiment of a PCB positioning structure of a power device of the present utility model;

fig. 6 is an assembled bottom view of an embodiment of a PCB positioning structure of a power device of the present utility model;

fig. 7 is an exploded view of an embodiment of a PCB positioning structure of a power device of the present utility model.

Wherein, each reference numeral in the figure mainly marks:

1. a heat dissipation bottom shell; 11. a bottom wall; 12. a sidewall; 121. a PCB limit groove; 122. a support boss; 13. a water cooling channel; 2. a tooling positioning plate; 21. a terminal limit groove; 22. a limit protrusion; 23. positioning holes; 3. a PCB board; 4. a signal terminal; 5. a screw; 6. a terminal fixing frame; 7. a limit column; 71. a limiting hole; 8. a water inlet; 9. and a water outlet.

Wherein, other marks in the figure:

x, a first direction; y, second direction; z, vertical direction.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the principles and structures of the present utility model are further described in detail below with reference to fig. 3-7 and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 and 2, the positioning mode of the PCBA board (i.e. power board) of the traditional power device (such as the vehicle-mounted charger) is realized by the casing design positioning component of the power device, if the positioning is performed by adopting the precise positioning column, the processing space on the side surface inside the casing is very limited, the precise processing difficulty is increased, so that the positioning precision is reduced and the processing cost is greatly increased. If the groove positioning is adopted, the side walls 12 on two sides of the groove are required to be approximately 90 degrees vertical to the inner surface of the shell, so that the processing cost of the shell is increased, and the positioning accuracy is difficult to reach the standard. In addition, for some occasions with strict heat dissipation requirements, the side wall 12 of the casing cannot be milled and positioned in order to avoid influencing the heat dissipation effect and the structural strength. In addition, when the PCBA is assembled with the shell, because the PCBA and the shell are assembled with each other, a series of tolerance chains such as the manufacturing form tolerance of the parts, the relative coordinate tolerance of the PCBA parts, the manufacturing tolerance of the shell positioning column, the relative positioning column tolerance of other areas of the shell and the like are considered, and the assembly of the parts faces the problems of looseness, stress cracking and the like after calculation of a plurality of tolerances.

Referring to fig. 3-7, the present utility model provides a PCB positioning structure of a power device, including:

a heat dissipation bottom shell 1, wherein the heat dissipation bottom shell 1 comprises a bottom wall 11 and a plurality of side walls 12 surrounding the periphery of the bottom wall 11, the bottom wall 11 and the side walls 12 integrally form a semi-closed space, and the semi-closed space is opened at the top end of the heat dissipation bottom shell 1 opposite to the heat dissipation bottom shell 1 (namely, the top side of the side walls 12 far away from the bottom wall 11 is opened); the surface of the side wall 12 of at least one side of the heat dissipation base 1 facing the outside of the heat dissipation base 1 is the outer surface of the side wall 12 (regarding the semi-enclosed space surrounded by the bottom wall 11 and the plurality of side walls 12 as the inside of the heat dissipation base 1, the external environment space of the opposite semi-enclosed space of the heat dissipation base 1 is the outside of the heat dissipation base 1); a plurality of tooling limiting structures arranged on the heat dissipation bottom shell 1; the fixture positioning plate 2, the fixture positioning plate 2 is provided with a plurality of positioning structures matched with the fixture limiting structures, the fixture positioning plate 2 is positioned and installed at the top end of the heat dissipation bottom shell 1 in a one-to-one corresponding matching mode through the plurality of positioning structures and the plurality of fixture limiting structures, and at least one terminal limiting groove 21 which is opposite to the corresponding side wall 12 of the heat dissipation bottom shell 1 is formed in the periphery of the fixture positioning plate 2.

The PCB positioning structure of the power device provided by the utility model further comprises:

at least one PCB 3, the working face of PCB 3 keeps away from the top edge linear interval of diapire 11 and sets up a plurality of signal terminal 4, the linear extension distance of a plurality of signal terminal 4 and the extension length phase-match of terminal spacing groove 21, and PCB 3 is installed on heat dissipation drain pan 1 through the cooperation location of the heat dissipation face of PCB 3 back to the working face and the surface of corresponding lateral wall 12, signal terminal 4 and terminal spacing groove 21 to through screw 5 or bolt fastening in the corresponding position of heat dissipation drain pan 1. As a preferred embodiment, the PCB board 3 is a PCBA; in other embodiments, the PCB board may also employ an FPC (flexible circuit board), a rigid-flex circuit board, a semi-flexible circuit board, a metal substrate circuit board (power board, copper substrate), a ceramic substrate circuit board, or other forms of printed circuit boards.

In one embodiment, at least one PCB limiting groove 121 is formed on the outer surface of the side wall 12 of at least one side of the heat dissipation bottom shell 1 facing the outside of the heat dissipation bottom shell 1, and the at least one terminal limiting groove 21 is opposite to the corresponding PCB limiting groove 121 for further positioning the PCB 3 during assembly; a heat conducting layer made of heat conducting materials is filled between the heat radiating surface and the bottom surface of the PCB limiting groove 21, and the peripheral side of the PCB limiting groove 121 does not need to be precisely processed to be perpendicular to the outer surface of the side wall 12 because the positioning exists between the terminal limiting groove 21 of the tooling positioning plate 2 and the signal terminal 4 of the PCB 3. In the present embodiment, the plurality of side walls 12 respectively correspond to the directions perpendicular to the bottom wall 11, the directions perpendicular to the bottom wall 11 (i.e., the directions respectively corresponding to the directions parallel to the respective side walls 12) being the vertical directions Z (i.e., the bottom wall 11 is parallel to the horizontal direction and extends in the horizontal direction, the respective side walls 12 extend in the vertical directions Z); as a preferred embodiment, the depth direction of the PCB retainer groove 121 is a first direction X perpendicular to the corresponding side wall 12 (i.e. parallel to the bottom wall 11), and the extending direction of the PCB retainer groove 121 is divided into: the first direction X, the second direction Y and the vertical direction Z are perpendicular to each other (i.e. the three form an XYZ rectangular coordinate system), and the second direction Y and the vertical direction Z form a plane extending direction of the PCB limiting groove 121 (i.e. the two form an XY plane coordinate system).

In this embodiment, the plurality of signal terminals 4 are linearly arranged along the second direction Y, the terminal limiting groove 21 is correspondingly matched with the plurality of signal terminals 4 to linearly extend along the second direction Y, the linear extension distance of the plurality of signal terminals 4 is matched with the extension lengths of the two ends of the terminal limiting groove 21 in the second direction Y, the PCB 3 is matched with the two sides of the PCB 3 near the bottom wall 11 through the radiating surface of the PCB 3 facing away from the working surface and the bottom surface of the PCB limiting groove 121 (i.e. the outer surface of the PCB limiting groove 121 facing the heat dissipation bottom shell 1 from the side wall 12 along the first direction X and the side near the semi-enclosed space goes deep into the side wall 12, the side of the PCB limiting groove 121 located inside the side wall 12 far from the side wall 12 facing the outer surface of the heat dissipation bottom shell 1 is the bottom surface of the PCB limiting groove 121), the peripheral side of the PCB 3 and the peripheral side of the PCB limiting groove 121 (may be just the side of the PCB 3 near the bottom wall 11 and the side of the PCB limiting groove 121 near the bottom wall 11, or may be the two sides of the PCB 3 near the bottom wall 11 and the two sides of the PCB limiting groove 121 near the second direction Y and the two ends of the PCB limiting groove 121 are correspondingly matched with the two ends of the corresponding signal terminals 121 in the second direction Y21 and the corresponding to the two ends of the signal limiting groove 121.

As a preferred embodiment, the top edge of the working surface is provided with at least one terminal fixing frame 6 extending along the second direction Y, and the terminal fixing frames 6 are provided with a plurality of fixing holes at intervals, which are matched with the shape of the signal terminals 4, and the signal terminals 4 fix the extraction direction of the signal terminals relative to the PCB board 3 by penetrating through the corresponding fixing holes. The terminal pin-out direction of the signal terminals 4 is preferably parallel to the vertical direction Z (i.e., parallel to the PCB board 3).

As a preferred embodiment, the heat dissipation bottom shell 1 is a rectangular heat dissipation bottom shell 1, the tooling positioning plate 2 is a rectangular plate, a limiting protrusion 22 is arranged on one side of the tooling positioning plate 2 in the first direction X, two terminal limiting grooves 21 are correspondingly arranged at two ends of the limiting protrusion 22 in the second direction Y respectively, a supporting boss 122 is arranged on the outer surface of a side wall 12 of one side (one side in the first direction X) of the heat dissipation bottom shell 1, which is opposite to the limiting protrusion 22, a supporting boss 122 is arranged on the outer surface of the side wall 12, which is opposite to one side (one side in the first direction X) of the limiting protrusion 22, one end, close to the limiting protrusion 22, of the terminal fixing frame 6 in the second direction Y is positioned and abutted between the limiting protrusion 22 and the supporting boss 122, and two PCB limiting grooves 121 are correspondingly arranged on the outer surface of the side wall 12, which is opposite to one side of the two terminal limiting grooves 21, in the first direction X, of the heat dissipation bottom shell 1. In this embodiment, a terminal limiting groove 21 is provided on the opposite side of the tooling positioning plate 2 in the first direction X, and another PCB limiting groove 121 is correspondingly provided on the outer surface of the side wall 12 opposite to the opposite side of the terminal limiting groove 21 in the first direction X of the heat dissipation bottom shell 1.

In this embodiment, the tooling limiting structure is a plurality of limiting posts 7 arranged on the peripheral side bottom wall 11 of the side wall 12 of the heat dissipation bottom shell 1, the limiting posts 7 extend away from the bottom wall 11 along the vertical direction Z, and a limiting hole 71 is formed in the top end of each limiting post 7 away from the bottom wall 11; the locating structure is locating hole 23 on locating frock locating plate 2 with spacing hole 71 assorted, frock locating plate 2 is installed in the top of heat dissipation drain pan 1 through a plurality of screws, a plurality of locating hole 23 and a plurality of spacing hole 71 one-to-one cooperation location. In other embodiments, the limiting post 7 may be replaced by a limiting boss, the limiting hole 71 is disposed at the top end of the limiting boss, and the positioning structure may be replaced by a positioning protrusion.

According to the PCB positioning structure of the power device and the power device using the PCB positioning structure, the positioning assembly between the plurality of PCB plates 3 and the shell, the main board and other parts is simulated by utilizing the matching between the tool positioning plate 2 and the heat dissipation bottom shell 1 and the plurality of PCB plates 3 (the positioning matching between the edge pins of the signal terminals 4 and the terminal limiting grooves 21 of the tool positioning plate 2 is used for limiting), and the positioning assembly between the plurality of PCB plates 3 and the shell, the main board and other parts can be realized by utilizing the matching positioning between the tool positioning plate 2 and the heat dissipation bottom shell 1 and the plurality of PCB plates 3 without considering complex tolerance chain calculation.

The specific positioning assembly sequence of the PCB positioning structure of the power device provided by the utility model is as follows:

firstly, a heat conducting material (such as heat conducting glue or heat conducting silicone grease) is smeared on a heat radiating surface of a PCB 3, then a tooling positioning plate 2 is positioned and assembled on a corresponding position on a heat radiating bottom shell 1, then the PCB 3 is positioned and placed on the corresponding position of the heat radiating bottom shell 1 through positioning and matching of edge pins of a signal terminal 4 and a terminal limiting groove 21 of the tooling positioning plate 2 (if a PCB limiting groove 121 is arranged on the side wall 12 of the heat radiating bottom shell 1, the PCB limiting groove 121 and the PCB 3 are also used for assisting in limiting), finally the PCB 3 is fastened on the heat radiating bottom shell 1 through a screw 5, and the tooling positioning plate 2 is disassembled to enter the next assembly flow.

The PCB positioning structure of the power device can realize foolproof assembly by adapting the length dimension of the terminal limiting groove 21 to the linear arrangement extension length of the signal terminals 4, is convenient to operate, improves the positioning precision of the PCB 3, and facilitates the butt joint of the signal terminals 4 and a main board or other parts after limiting to realize electric communication; the tooling positioning plate 2 belongs to one-time cost, the tooling positioning plate 2 can be shared by batch products when being produced, the service life can reach more than 10 ten thousand times, the production cost is about 400 yuan/one, the price calculated on each power device product is increased by about 0.04 yuan/table, the traditional fine positioning column and the fine positioning groove are all subjected to fine machining after the production of a mould, and the general price of one fine machining surface is different from a few wool to a few yuan when being increased on each power device product, so the PCB positioning structure of the power device greatly reduces the production cost.

The utility model also provides a power device (not shown in the figure), which comprises a shell, a main board arranged in the shell, and the PCB positioning structure of the power device, wherein the main board is arranged at the top end of the heat dissipation bottom shell 1 and is connected with the signal terminals 4. In this embodiment, the terminal pins of the signal terminals 4 and the motherboard circuit are assembled by soldering or mating of male and female sockets.

As a preferred embodiment, the power device is a vehicle-mounted charger, the top end of the peripheral side wall 12 of the heat dissipation bottom shell 1 is provided with a water cooling channel 13, and the side wall 12 at one end of the heat dissipation bottom shell 1 is provided with a water inlet 8 and a water outlet 9 which are respectively communicated with two ends of the water cooling channel 13. In a preferred embodiment, the vehicle-mounted charger is an OCB charger, and the heat dissipation bottom shell 1 is provided with a three-dimensional water channel communicated with the top end of the water cooling channel 13 of the peripheral side wall 12.

The utility model also provides a new energy automobile, the whole automobile system of the new energy automobile comprises the power device, and a system water channel of the whole automobile system is communicated with the water inlet 8 and the water outlet 9 of the water cooling channel 13 of the heat dissipation bottom shell 1. As a preferred embodiment, the new energy vehicle is an electric vehicle.

It should be noted that the foregoing is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, as long as the complete system includes the tooling structure of the PCB positioning structure of the power device provided by the present utility model, the power device assembled by using the tooling structure, and the new energy automobile using the power device all belong to the scope of the present utility model, including but not limited to PCB boards of different materials, different shapes and sizes of the tooling structure limiting grooves, different shapes and sizes of the tooling structure, and shapes, sizes, numbers, distributions, etc. of parts of the housing of the complete system, where the PCB boards are assembled or assembled in a limited manner by welding or other connection methods by using similar tooling structures, that is, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A PCB positioning structure of a power device, comprising:

the heat dissipation bottom shell is provided with a plurality of tool limiting structures;

the fixture positioning plate is provided with a plurality of positioning structures matched with the fixture limiting structures, the fixture positioning plate is positioned and installed at the top end of the heat dissipation bottom shell in a one-to-one corresponding matching manner through the positioning structures and the fixture limiting structures, and at least one terminal limiting groove opposite to the corresponding side wall of the heat dissipation bottom shell is formed in the periphery of the fixture positioning plate;

at least one PCB board, the working face top edge linear interval of PCB board sets up a plurality of signal terminal, a plurality of signal terminal's linear extension distance with the extension length phase-match of terminal spacing groove, the PCB board is through the PCB board dorsad the heat dissipation face of working face and the surface of the lateral wall that corresponds signal terminal with the cooperation location in the terminal spacing groove is installed on the heat dissipation drain pan.

2. The PCB positioning structure of claim 1, wherein at least one PCB limiting groove is formed on an outer surface of a side wall of at least one side of the heat dissipation bottom case, and at least one terminal limiting groove is opposite to the corresponding PCB limiting groove;

the PCB board is installed in the corresponding PCB limiting groove through the heat radiating surface of the PCB board facing away from the working surface, the bottom surface of the corresponding PCB limiting groove, the peripheral side of the PCB board, the peripheral side of the corresponding PCB limiting groove and the matching positioning of the corresponding signal terminal and the terminal limiting groove.

3. The PCB positioning structure of the power device of claim 2, wherein the top edge of the working surface is provided with at least one terminal holder, the terminal holder is provided with a plurality of fixing holes matching with the shape of the signal terminals, and the signal terminals fix the extraction direction of the signal terminals relative to the PCB board by passing through the corresponding fixing holes.

4. The PCB positioning structure of claim 3, wherein the heat dissipation bottom shell is a rectangular heat dissipation bottom shell, the fixture positioning plate is a rectangular plate, a limiting protrusion is arranged on one side of the fixture positioning plate, two terminal limiting grooves are correspondingly arranged at two ends of the limiting protrusion respectively, a supporting boss is arranged on the outer surface of the side wall of the heat dissipation bottom shell, which is opposite to one side of the limiting protrusion, and one end of the terminal fixing frame, which is close to the limiting protrusion, is positioned and abutted between the limiting protrusion and the supporting boss.

5. The PCB positioning structure of claim 4, wherein another terminal limit groove is provided on the opposite side of the tooling positioning plate.

6. The PCB positioning structure of any one of claims 1-5, wherein the tooling limiting structure is a plurality of limiting posts provided on a peripheral bottom wall of a side wall of the heat dissipation bottom shell, and a limiting hole is provided on a top end of the limiting post far from the bottom wall;

the locating structure is a locating hole matched with the limiting hole, and the tool locating plate is located and installed at the top end of the heat dissipation bottom shell in a one-to-one corresponding matching mode through a plurality of screws, a plurality of locating holes and a plurality of limiting holes.

7. The PCB positioning structure of any one of claims 2-5, wherein a heat conductive layer made of a heat conductive material is filled between the heat dissipating surface and the bottom surface of the PCB restraining slot.

8. A power device comprising a motherboard, wherein the power device further comprises a PCB positioning structure of the power device according to any one of claims 1 to 7, and the motherboard is mounted on a top end of the heat dissipation bottom case and connected to the signal terminals.

9. The power device of claim 8, wherein the power device is a vehicle-mounted charger, a water cooling channel is arranged at the top end of the side wall of the periphery side of the heat dissipation bottom shell, and a water inlet and a water outlet which are respectively communicated with two ends of the water cooling channel are arranged at the side wall of one end of the heat dissipation bottom shell.

10. A new energy automobile, characterized in that the whole vehicle system of the new energy automobile comprises the power device as claimed in claim 8 or 9.

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