CN104659878B - A kind of electric car charger - Google Patents

Abstract

The invention discloses an electric vehicle charger, which belongs to the field of electric vehicles. The electric vehicle charger includes an upper casing, a PCB board, a lower casing, heat dissipation teeth and a cover plate, the upper casing is an open box, and the bottom surface of the side wall is provided with a closed loop relative to the circumference of the side wall. A sealing groove, a sealing tape is provided in the sealing groove, the PCB board is installed in the cavity of the upper case, the lower case is buckled with the upper case to form a charger shell, and the heat dissipation teeth It is fixedly arranged on the top outer surface, and the cover plate covers above the heat dissipation teeth. In the present invention, a closed-loop sealing groove is provided on the bottom surface of the side wall of the upper casing, and a structure of a sealing tape is provided in the sealing groove, so as to play a role of dustproof and sealing, so that the protection level of the present invention meets the protection requirements of IPX7, ensuring The reliable use of the invention satisfies the high protection requirements of electric vehicles.

Description

An electric vehicle charger

technical field

The invention relates to the field of electric vehicles, in particular to an electric vehicle charger.

Background technique

At present, facing the depletion of traditional energy in the international community, the application of electric vehicles is developing rapidly. The use of electric vehicles can effectively reduce the dependence on petroleum resources and meet the requirements of low-carbon social development. As we all know, the battery is the energy source of the electric vehicle, and the electric vehicle charger is an indispensable tool for the battery to realize the charging process.

The electric vehicle charger is a static converter device that uses power electronic semiconductor devices to convert alternating current with constant voltage and frequency into direct current. Most electric car chargers currently on the market are composed of a shell and a PCB board (English: Printed Circuit Board, Chinese: Printed Circuit Board) fixed inside the shell. The shell is composed of a shell and a top cover. The space is fixed by screws. Electric vehicle chargers are usually installed in the front cabin area of the car.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

Due to the harsh conditions of dust and water in the front cabin of the car, the protection level must meet the high protection requirements of IPX7 in order to ensure the reliable use of the charger. If the protection level is not enough, once the electric vehicle charger case encounters water, it may cause a short circuit of the transformer. The light ones damage the normal use of the electric vehicle charger, and the severe ones may cause hidden dangers such as fire. However, the existing electric vehicle charger housing and the upper cover are fixed by screws, the sealing effect is not good, and the waterproof and dustproof grades are low, which cannot meet the high protection requirements of electric vehicles.

Contents of the invention

In order to solve the problems in the prior art that electric vehicle chargers have poor sealing effect, low waterproof and dustproof levels, and cannot meet the high protection requirements of electric vehicles, an embodiment of the present invention provides an electric vehicle charger. Described technical scheme is as follows:

An electric vehicle charger, said electric vehicle charger comprising an upper housing, a PCB board, a lower housing, cooling teeth and a cover plate,

The upper casing is an open box, and the inside of the upper casing is a cavity, the upper casing includes a top and side walls, the side walls surround and surround the top, and the bottom of the side walls is opposite to Its circumference extends outwards to form the connecting portion of the upper housing, and the bottom surface of the side wall is provided with a closed-loop sealing groove relative to the circumference of the side wall, and a sealing tape is provided in the sealing groove.

The PCB board is installed in the cavity of the upper housing, and the PCB board is fixedly connected to the top,

The lower case is plate-shaped, and the lower case is fastened with the upper case to form a charger shell. The fastening surface of the lower case is provided with a groove corresponding to the position of the PCB board, and the lower case is The housing is provided with the lower housing connecting part corresponding to the position of the upper housing connecting part, and the connection between the lower housing and the upper housing passes through the upper housing connecting part and the lower housing connecting part fixedly connected, the lower shell and the upper shell are sealed by the sealing tape,

The heat dissipation teeth are fixedly arranged on the outer surface of the top, and the PCB board dissipates heat through the heat dissipation teeth,

The cover plate is covered above the heat dissipation teeth, and the cover plate is fixedly connected with the upper casing;

The lower housing is provided with a boss corresponding to the position of the main heating element of the PCB, and a heat conducting gasket is arranged between the boss and the main heating element of the PCB;

A hollow structure is provided on the non-fastening surface of the lower shell corresponding to the position of the boss;

The hollow structure adopts four square hollow structures, and cross-shaped connecting walls are arranged between the four square hollow structures.

Optionally, the cross section of the sealing strip is wide in the middle and narrow in both sides.

Optionally, the sealing strip is made of closed-cell silica gel or microporous silica gel.

Further, the electric vehicle charger includes a fan, the fan is arranged in the heat dissipation teeth, and the heat dissipation is assisted by the fan.

Further, the side wall of the upper housing is provided with a circular groove, through which the components of the electric vehicle charger are fixed.

Optionally, the connection part of the lower case includes a fixed point connection hole, the fixed point connection hole is set on the fixed point boss, and a fixed point recess is provided at the connection between the fixed point boss and the lower case. groove.

Optionally, the upper case, the lower case and the heat dissipation teeth are all made of die-cast aluminum, and the outer surfaces of the upper case, the lower case and the heat dissipation teeth are all made of black anodes oxidation treatment.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

In the present invention, a closed-loop sealing groove is provided on the bottom surface of the side wall of the upper casing, and a structure of a sealing tape is provided in the sealing groove, so as to play a dustproof and sealing role, so that the protection level of the present invention meets the protection requirements of IPX7, ensuring The reliable use of the invention satisfies the high protection requirements of electric vehicles.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a three-dimensional view of the overall structure of an electric vehicle charger provided by an embodiment of the present invention;

Fig. 2 is a bottom view of the upper housing shown in Fig. 1;

Fig. 3 is a perspective view of the lower case provided by the embodiment of the present invention;

Fig. 4 is the A direction view of Fig. 3;

Fig. 5 is a perspective view of the sealing tape provided by the embodiment of the present invention.

The meanings of the symbols in the figure are as follows:

1 upper case,

11 top, 12 side wall, 13 upper housing connection, 14 sealing groove, 15 sealing band, 16 circular groove, 17 positioning groove,

2 lower case,

21 Groove, 22 Connecting part of lower housing, 23 Boss, 231 Inductor boss, 232 Transformer boss, 24 Positioning boss, 25 Fixed point boss, 26 Fixed point groove, 27 Hollow structure, 28 Cross connection wall, 29 fixing point connection holes,

3 PCB boards,

31 electrolytic capacitor, 32 IGBT, 33 thermal pad, 34 transformer, 35 inductor,

4 cooling teeth,

5 cover plate,

6 mounting screws,

7 fans,

8 fastening screws,

9 Thermal pad.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1, also refer to Fig. 2, the present embodiment is described mainly with Fig. 1, and the present invention provides a kind of electric car charger, and described electric car charger comprises upper housing 1, PCB board 3 ( See Fig. 2), lower housing 2, cooling teeth 4 and cover plate 5,

As shown in Figure 1, the upper case 1 is an open box, and the interior of the upper case 1 is a cavity, the upper case 1 includes a top 11 and a side wall 12, the side wall 12 surrounds and Around the top 11, the bottom of the side wall 12 extends outward relative to its circumference to form an upper housing connection portion 13, and the bottom surface of the side wall 12 is provided with a closed-loop sealing groove 14 relative to the circumference of the side wall 12 ( Referring to Fig. 2), the seal groove 14 (see Fig. 2) is provided with a sealing strip 15 (see Fig. 2),

As shown in FIG. 2, the PCB board 3 is installed in the cavity of the upper housing 1, and the PCB board 3 is fixedly connected to the top 11 (see FIG. 1 ),

As shown in Figure 3, the lower case 2 is plate-shaped, and the lower case 2 is fastened with the upper case 1 (see Figure 2) to form a charger shell, and the fastening surface of the lower case 2 is A groove 21 is provided corresponding to the position of the PCB 3 (see FIG. 2 ), and the lower case 2 is provided with the lower case connection portion 22 corresponding to the position of the upper case connection portion 13 (see FIG. 2 ). , the lower case 2 is fixedly connected to the upper case 1 (see FIG. 2 ) through the upper case connecting portion 13 (see FIG. 2 ) and the lower case connecting portion 22, and the lower case The casing 2 and the upper casing 1 (see FIG. 2 ) are sealed by the sealing tape 15 (see FIG. 2 ),

As shown in Figure 1, the heat dissipation teeth 4 are fixedly arranged on the outer surface of the top 11, and the PCB board 3 dissipates heat through the heat dissipation teeth 4,

As shown in FIG. 1 , the cover plate 5 covers the heat dissipation teeth 4 , and the cover plate 5 is fixedly connected with the upper casing 1 . The cover plate 5 prevents foreign matter from falling into the heat dissipation channels formed by the heat dissipation teeth 4 .

Wherein, the so-called top and bottom are relative concepts. In this embodiment, the top and bottom are defined on the basis of FIG. 1 seen by readers.

Referring to Fig. 1, all locking bolts on the electric vehicle charger of the present invention are evenly locked with a torque of 6N. ) into a water tank that has been filled with water, and according to the IPX7 test requirements, sink the electric vehicle charger shell 1 meter underwater, keep it for 30 minutes, pull the electric vehicle charger shell out of the water, Loosen the locking bolt, open the upper casing 1 and observe that there is no water mark inside the electric vehicle charger shell (that is, the upper casing 1 and the lower casing 2), which shows that the sealing structure on the electric vehicle charger of the present invention is completely Meet IPX7 requirements.

As shown in Figure 2, the present invention provides a closed-loop sealing groove 14 on the bottom surface of the side wall 12 of the upper casing 1, and a structure of a sealing tape 15 is provided in the sealing groove 14, so as to play a role of dustproof and sealing. The protection level of the present invention meets the protection requirements of IPX7, ensures the reliable use of the present invention, and meets the high protection requirements of electric vehicles.

Specifically, as shown in FIG. 2 , in this embodiment, the PCB board 3 is fixedly connected to the upper casing 1 via fastening screws 8 .

Specifically, as shown in FIG. 1 , in this embodiment, there are a plurality of heat dissipation teeth 4 , and the plurality of heat dissipation teeth 4 are stacked in parallel to facilitate ventilation and heat dissipation.

Specifically, as shown in FIG. 5 , in this embodiment, the cross section of the sealing strip 15 is wide in the middle and narrow in both sides. Through the above structure, the sealing effect is further enhanced.

More specifically, as shown in Figure 5, in this embodiment, the sealing tape 15 is made of rubber sealing tape, more specifically, in this embodiment, the sealing tape 15 is made of closed-cell silica gel or microporous silica gel become. Therefore, the sealing tape 15 has the characteristics of strong sealing performance, high resilience performance, wide service temperature range (-50°C-260°C), etc., which greatly improves the protection level.

Specifically, as shown in FIG. 2 , in this embodiment, the lower housing 2 is provided with a boss 23 corresponding to the position of the main heat-generating device of the PCB board 3 , and the boss 23 is connected to the main heat-generating device of the PCB board 3 Thermal pads 9 are provided between them. More specifically, the thermal pad 9 is pasted on the boss 23 . In this embodiment, by setting the boss 23 in the lower case 2 and the structure of the heat-conducting gasket 9 on the boss 23, the flexible connection between the main heating element of the PCB board 3 and the lower case 2 is not realized, and the PCB board 3. The heat generated by the main heat-generating components is transferred to the lower casing 2 through the heat-conducting gasket 9 for rapid heat dissipation. In addition, the heat generated by the main heat-generating components of the PCB board 3 is also transferred to the upper casing 1 through the fastening screws 8, and dissipates heat outward through the heat-dissipating teeth 4, thereby realizing two-way heat dissipation, ensuring temperature difference with other heat sources, and evenly dissipating heat.

More specifically, as shown in FIG. 2 , in this embodiment, the main heating components of the PCB board 3 include an inductor 35 , a transformer 34 and an electrolytic capacitor 31 , all of which are fixed on the PCB board 3 through pins. Correspondingly, the boss 23 in the lower casing 2 has an inductor boss 231 and a transformer boss 232 . More specifically, the heat conduction gasket 9 is a heat conduction silicone gasket. Through the above structure, fast and effective heat dissipation is ensured.

Specifically, as shown in FIG. 4 , in this embodiment, a hollow structure 27 is provided on the non-fastening surface of the lower housing 2 corresponding to the position of the boss 23 . With the above structure, the weight is reduced.

More specifically, as shown in FIG. 4 , in this embodiment, the hollow structure 27 adopts four square hollow structures 27 . There are cross-shaped connecting walls 28 between the four quadrangular hollow structures 27, and the cross-shaped connecting walls 28 increase the heat dissipation area and accelerate heat dissipation.

Specifically, as shown in FIG. 1 , in this embodiment, the electric vehicle charger includes a fan 7 , and the fan 7 is arranged in the heat dissipation teeth 4 , and the heat dissipation is assisted by the fan 7 . More specifically, the fan 7 is arranged in the heat-dissipating tooth 4 corresponding to the heat-concentrating area of the main heat-generating device of the PCB board 3, and is forced to perform forced heat exchange with the surrounding air to ensure uniform and rapid heat dissipation, and prolong the life of the electric vehicle charger described in the present invention. service life.

Specifically, as shown in FIG. 1 , in this embodiment, the side wall 12 of the upper casing 1 is provided with a circular groove 16 through which the components of the electric vehicle charger are fixed. Through the circular groove 16, multiple screws are used to fix the components of the electric vehicle charger, which facilitates the miniaturization design of the electric vehicle charger of the present invention.

More specifically, as shown in FIG. 1 , in this embodiment, the side wall 12 of the upper casing 1 has a circular groove 16 that can be used to fix internal components, and is fastened by using a trapezoidal heat conducting sheet 33 and five M3 mounting screws 6 The pressing makes the high-power IGBT 32 (Insulated Gate Bipolar Transistor), a key heating component, closely contact with the upper case 1. This installation method dissipates heat quickly and effectively, and is convenient for the miniaturization design of the electric vehicle charger of the present invention. Among them, IGBT 32 is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (bipolar transistor) and MOS (insulated gate field effect transistor), which has both high input impedance of MOSFET and low conduction voltage of GTR Advantages in two respects.

Specifically, as shown in FIG. 3 , in this embodiment, the lower housing connection portion 22 includes a fixed point connection hole 29, and the fixed point connection hole 29 is arranged on the fixed point boss 25, and the fixed point connection The hole 29 is used for connecting with an external object, and the connection between the fixed point boss 25 and the lower casing 2 is provided with a fixed point groove 26 . In this embodiment, the structure of the fixed point boss 25 ensures the strength of the fixed point, and the structure of the fixed point groove 26 prevents cracks in the die-casting process of the lower casing 2, ensuring that the mold is easy to form.

Specifically, as shown in FIG. 3 , in this embodiment, the lower housing 2 is provided with a positioning protrusion 24 at the inward portion corresponding to the sealing groove 14 (see FIG. 2 ) of the upper housing 1 (see FIG. 2 ), so that The positioning protrusion 24 is U-shaped as a whole. Correspondingly, the upper housing 1 is provided with a positioning groove 17 (see FIG. 2 ), and the positioning groove 17 (see FIG. 2 ) is connected with the positioning protrusion 24 match. Through the positioning protrusion 24 and the positioning groove 17 (see FIG. 2 ), not only guides are formed to facilitate the positioning and assembly of the upper casing 1 (see FIG. 2 ) and the lower casing 2, but also play a dustproof role. To achieve the purpose of secondary protection.

Specifically, as shown in FIG. 1, the upper case 1, the lower case 2 and the heat dissipation teeth 4 are all made of die-cast aluminum, so that the electric vehicle charger of the present invention is lightweight, and the The outer surfaces of the upper casing 1 , the lower casing 2 and the heat dissipation teeth 4 are all black anodized, so that the electric vehicle charger of the present invention has a good heat dissipation effect.

Specifically, as shown in Figure 1, the upper casing 1, the lower casing 2 and the heat dissipation teeth 4 are made of die-cast aluminum, which is light in weight and only one-third of the weight of a cast iron radiator with the same heat dissipation , to meet the lightweight requirements of electric vehicles, and this material has good mold formability and is suitable for mass production; the aluminum alloy surface is black anodized, with high thermal efficiency and good thermal conductivity. Under the same power level, PCB board 3 The surface temperature of the main components drops obviously, prolonging the service life of the main components in the PCB board 3 .

Specifically, as shown in Figure 1, in this embodiment, the upper case 1 and the lower case 2 are fastened and sealed with eight M5 mounting screws 6 on both sides and four M5 mounting screws 6 on both ends, with a high protection level and meeting the requirements of electric vehicles. The protection level IPX7 has high requirements, and the mounting screws 6 are coated with thread locking glue to enhance the fastening effect, so as to meet the anti-loosening and vibration requirements.

Referring to Fig. 1, in addition, since the upper part of the electric vehicle charger of the present invention generates more heat than the lower part, the mounting screws 6 (see Fig. 3) on both sides of the upper case 1 and the lower case 2 are defined as from bottom to bottom Install it on the top, so as to increase the heat dissipation area of the upper casing 1 as much as possible.

Wherein, the so-called up and down are relative concepts, and this embodiment is based on the definition of up and down based on FIG. 1 seen by readers.

The IPX7 test experiment process of electric vehicle charger of the present invention:

It can be seen that the electric vehicle charger of the present invention has a high protection level in structural design, light weight, uniform heat dissipation, fast speed, and long service life, which fully meets the needs of modern electric vehicles for on-board chargers.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (7)

1. a kind of electric car charger, it is characterised in that the electric car charger includes upper shell, pcb board, lower casing Body, radiation tooth and cover plate,

It is cavity inside opening box body, and the upper shell that the upper shell is, the upper shell includes top and side wall, described Side wall encloses and in the top surrounding, and the sidewall bottom outwards extends as upper shell connecting portion, the side wall with respect to its border The relatively described side wall border in bottom surface is provided with the seal groove of closed loop, is provided with band in the seal groove,

In the upper shell cavity, the pcb board is fixedly connected the pcb board with the top,

The lower house is tabular, and the lower house fastens to form charger case with the upper shell, and the lower house is fastened The corresponding pcb board position in face is provided with groove, and the corresponding upper shell connecting portion of the lower house has installed the lower house Connecting portion, is fixed by the upper shell connecting portion and the lower house connecting portion between the lower house and the upper shell and is connected Connect, sealed by the band between the lower house and the upper shell,

The radiation tooth is fixedly installed on the outer surface of cupular part, and the pcb board is radiated by the radiation tooth,

The cover plate is covered in above the radiation tooth, and the cover plate is fixedly connected with the upper shell；

The lower house corresponds to the main heater members position of the pcb board and is provided with boss, and the boss is mainly sent out with the pcb board Heat-conducting pad is provided between thermal device；

In the non-buckling surface of the lower house, the corresponding lug boss position is provided with hollow structure；

The hollow structure is provided with cross company using four tetragonal body hollow structures between four tetragonal body hollow structures Connect wall.

2. electric car charger according to claim 1, it is characterised in that the band cross section is in middle wide by two Side is narrow.

3. electric car charger according to claim 1, it is characterised in that the band adopts closed pore silica gel or micro- Hole silica gel is made.

4. electric car charger according to claim 1, it is characterised in that the electric car charger includes wind Fan, the fan is arranged in the radiation tooth, by the fan auxiliary heat dissipation.

5. electric car charger according to claim 1, it is characterised in that the upper casing body sidewall is provided with circular recessed Groove, the device that the electric car charger is fixed by the circular groove.

6. the electric car charger according to claim 1-5 any one claim, it is characterised in that the lower house Connecting portion includes that fixing point connecting hole, the fixing point connecting hole are arranged on fixing point boss, the fixing point boss and institute State lower house junction and be provided with fixing point groove.

7. electric car charger according to claim 6, it is characterised in that the upper shell, the lower house and institute State radiation tooth to make using die casting aluminium, the outer surface of the upper shell, the lower house and the radiation tooth does black sun Pole oxidation processes.