Charging pile with natural heat dissipation function

Abstract

The utility model provides a charging pile capable of naturally dissipating heat, which comprises a charging pile body, a front cover and a rear cover which are arranged on a base, and at least one charging pile module is arranged on the charging pile body; the charging pile module comprises a printed circuit board provided with a charging module circuit and a radiator; the radiator comprises a heat absorption surface abutting against the printed circuit board, and the back face of the heat absorption surface is a heat dissipation surface on which heat dissipation teeth are evenly distributed. When the charging pile module is installed on the charging pile body, the heat dissipation face right faces the rear cover, the heat dissipation teeth are perpendicular to the ground, an air inlet is formed in the bottom of the rear cover, and an air outlet is formed in the top of the rear cover. A channel between the air inlet and the heat dissipation teeth and the air outlet form a heat dissipation channel through which cold air enters the charging pile from the air inlet and absorbs heat among the heat dissipation teeth to form hot air, and the hot air is discharged from the air outlet. According to the utility model, natural wind is adopted to cool the radiating teeth of the radiator, additional electric energy is not needed, and the maintenance is also convenient.

Description

Technical Field

[0001] The utility model relates to an electric pile with natural heat dissipation. Background Art

[0002] A charging pile, also known as an electric vehicle charging station or electric vehicle power supply equipment, is a device that provides electrical energy to electric vehicles, enabling them to store enough electricity to support their operation.

[0003] The input of a charging station is directly connected to the AC power grid, and the output is equipped with a charging plug for charging electric vehicles. Charging stations generally offer both conventional and fast charging. Users can swipe a specific charging card through the station's user-friendly interface to perform charging operations and print out charging data. The station's display shows data such as charge level, cost, and charging time.

[0004] The charging pile module, also known as the charging pile power module, is used in DC charging piles to convert AC power from the AC grid into DC power for charging the power battery. It is the core component of DC charging piles that enables charging of power batteries. The core component of the charging pile module is the power converter, which converts AC power (mains electricity) into DC power to charge the vehicle's power battery. Traditional charging pile modules mainly include four parts: input filter, power factor correction circuit, DC conversion circuit, and output filter.

[0005] Currently, a single charging station contains several modules. For example, one charging station has four modules with the same basic structure and two charging guns. The host computer controls how these modules are distributed to the guns. Since these modules have the same output voltage, they can be connected in parallel to power a single gun. If two guns are charging different cars, two modules can be assigned to each. In reality, each charging station module is composed of multiple parallel groups of input filters, power factor correction circuits, DC converter circuits, and output filters.

[0006] Because of its high power, the charging module used to charge a car requires a radiator to function properly. Patent document CN107994757 A discloses a new charging pile power module. This module houses a power converter within a sealed housing filled with thermal oil, completely immersing the converter. External radiators are mounted on both sides of the sealed housing. A circulating pump draws the thermal oil from the sealed housing, cools it in the external radiator, and then re-injects it into the sealed housing, maintaining a relatively low temperature for the entire converter. This fully sealed design ensures heat dissipation for the power module, ensuring its normal and reliable operation and preventing the impact of external environmental factors on the module. It is particularly suitable for use in complex and changing outdoor environments, offering safety, reliability, and a long service life.

[0007] Such a heat dissipation structure has the following disadvantages:

[0008] (1) The electronic circuits of the entire charging module are immersed in the heat-conducting oil in the sealed housing, which is inconvenient to maintain.

[0009] (2) A pump is required to pump the heat transfer oil in the sealed housing to an external radiator for heat dissipation, which requires electricity. Utility Model Content

[0010] The utility model aims to address the shortcomings of the current charging pile in which the circuit boards of the charging modules are all encapsulated in a sealed shell and surrounded by thermal oil. The utility model provides a charging pile with natural heat dissipation. In the charging pile, the charging module is installed on one side of the radiator, and natural wind is used to cool the heat dissipation teeth of the radiator. No additional electricity is required and it is also convenient for maintenance.

[0011] The technical solution adopted by the utility model to achieve its technical purpose is: a charging pile with natural heat dissipation, including a charging pile body installed on a base, a front cover arranged in front of the charging pile body, a rear cover arranged behind the charging pile body, and at least one charging pile module installed on the charging pile body; the charging pile module includes a printed circuit board and a radiator provided with a charging module circuit; the radiator includes a heat-absorbing surface close to the printed circuit board, and a heat-dissipating surface with heat-dissipating teeth evenly distributed on the back of the heat-absorbing surface; when the charging pile module is installed on the charging pile body, the heat-dissipating surface faces the rear cover, and the heat-dissipating teeth are arranged perpendicular to the ground. An air inlet is provided at the bottom of the rear cover, and an air outlet is provided at the top. The air inlet, the channel between the heat-dissipating teeth, and the air outlet form a heat dissipation channel in which cold air enters the charging pile from the air inlet, absorbs heat between the heat-dissipating teeth, and forms hot air discharged from the air outlet.

[0012] Furthermore, in the above-mentioned natural heat dissipation charging pile: the air inlet and the air outlet are both inclined air outlets.

[0013] Furthermore, in the above-mentioned naturally heat-dissipating charging pile: four charging pile modules are provided on the charging pile body, namely, upper, lower, left and right; each heat dissipating tooth of the upper charging pile module is in a straight line with each heat dissipating tooth of the lower module.

[0014] Furthermore, in the above-mentioned charging pile with natural heat dissipation: a fan is provided between the upper and lower charging pile modules to accelerate the flow of air from bottom to top.

[0015] Furthermore, in the above-mentioned naturally heat-dissipating charging pile: a heat-absorbing plane connected to the heat-dissipating plane of the high-power semiconductor device in the charging pile module circuit and a heat-absorbing tank filled with heat-conducting liquid are provided on the heat-absorbing surface of the radiator (42) of the charging pile module, and the winding coil device in the circuit of the charging pile module is immersed in the heat-conducting liquid.

[0016] Furthermore, in the above-mentioned natural heat dissipation charging pile: the winding coil device includes an inductor and a transformer, and the high-power semiconductor device includes a MOS tube.

[0017] Furthermore, in the above-mentioned natural heat dissipation charging pile: the printed circuit board includes an inductor sub-board on which all inductors are welded, a transformer sub-board on which all transformers are welded, and a main printed circuit board on which other components are welded.

[0018] Furthermore, in the above-mentioned natural heat dissipation charging pile: the heat absorption tank includes an inductor heat absorption tank and a transformer heat absorption tank; all the inductor coils are immersed in the heat-conducting liquid in the inductor heat absorption tank, and the inductor sub-plate is sealed and covered on the notch of the inductor heat absorption tank; all the transformer coils are immersed in the heat-conducting liquid in the transformer heat absorption tank, and the transformer sub-plate is sealed and covered on the notch of the transformer heat absorption tank.

[0019] Furthermore, in the above-mentioned naturally dissipating charging pile: the main printed circuit board is supported on the heat-absorbing surface by a metal rod, the MOS tube is fixed to the heat-absorbing surface by bolts, the heat dissipation plane of the MOS tube is close to the heat-absorbing plane on the heat-absorbing surface, and the pins of the MOS tube are welded on the main printed circuit board.

[0020] In the utility model, natural wind is used to cool the heat dissipation teeth of the radiator, no additional electric energy is required, and maintenance is convenient.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 This is a three-dimensional diagram of a charging pile according to an embodiment of the present utility model;

[0023] Attachment Figure 2This is a three-dimensional diagram of the charging pile of the embodiment of the utility model after removing the rear cover;

[0024] Attachment Figure 3 This is an exploded view of a charging pile according to an embodiment of the present utility model;

[0025] Attachment Figure 4 This is a three-dimensional diagram of a charging pile module in a charging pile according to an embodiment of the present utility model;

[0026] Attachment Figure 5 This is a three-dimensional diagram of the radiator in the charging pile according to the embodiment of the utility model;

[0027] Attachment Figure 6 This is an exploded view of the charging pile module in the charging pile of an embodiment of the present utility model. DETAILED DESCRIPTION

[0028] Example 1, as Figure 1 、 2 As shown in Figures 1 and 3, this embodiment is a naturally heat-dissipating charging pile, comprising a charging pile body 1 mounted on a base 101, a front cover 2 arranged in front of the charging pile body 1, and a rear cover 3 arranged behind the charging pile body 1. Since the charging pile is generally installed on a field, a base is required. The charging pile body 1 is a bracket for mounting the charging pile module 4. On the side of the charging pile body 1 is an interface 11 for mounting the charging gun. In this embodiment, four charging pile modules 4 are installed in the charging pile body 1. The charging pile module 4 is composed of an electronic circuit composed of electronic components and wires arranged on an electronic circuit board 41. A radiator 42 for dissipating heat for the electronic circuit board is installed behind the electronic circuit board 4. The electronic circuit board 1 is generally referred to as a PCB. In the following description, PCB is an electronic circuit board, and electronic circuit board is PCB. They are the same concept.

[0029] The radiator 42 includes a heat-absorbing surface 421 close to the printed circuit board 41, and on the back of the heat-absorbing surface 421 is a heat-dissipating surface 422 evenly distributed with heat-dissipating teeth 4221; when the charging pile module 4 is installed on the charging pile body 1, the heat-dissipating surface 422 is facing the back cover 3, and the heat-dissipating teeth 4221 are arranged perpendicular to the ground. An air inlet 31 is provided at the bottom of the back cover 3, and an air outlet 32 ​​is provided at the top. The air inlet 31, the channel between the heat-dissipating teeth 4221, and the air outlet 32 ​​form a heat-dissipating channel in which cold air enters the charging pile from the air inlet 31, absorbs heat between the heat-dissipating teeth 4221, and forms hot air discharged from the air outlet 32. Since hot air is lighter than cold air, the air around the heat dissipation teeth 4221 absorbs the heat transferred by the heat dissipation teeth 4221 and becomes hot air with a lighter specific gravity, so it will float upward. At this time, cold air enters from the bottom air inlet 31 to fill the space left by the hot air floating up, and finally the hot air is blown out from the upper air outlet 32, forming a smoke halogen effect and naturally dissipating heat.

[0030] like Figure 1 As shown, the air inlet 31 and the air outlet 32 ​​are both inclined air outlets. This not only increases the area of ​​the air outlet, but also automatically drops dust that falls on the top of the rear cover 3.

[0031] In this embodiment, the charging pile body 1 is equipped with four charging pile modules 4: upper, lower, left, and right. Each heat dissipation tooth 4221 of the upper charging pile module 4 is aligned with each heat dissipation tooth 4221 of the lower charging pile module 4. A fan 4222 is also installed between the upper and lower charging pile modules 4 to accelerate air flow from bottom to top. The rear cover 3 essentially acts as a ventilation duct behind the charging pile, effectively dissipating heat from the radiator.

[0032] In the charging pile of this embodiment, four natural heat dissipation charging pile modules 4 are installed, such as Figure 4 、 5As shown in Figure 6, the module includes an input filter, a power factor correction circuit, a DC conversion circuit, and an output filter, all mounted on a printed circuit board (PCB). The printed circuit board (PCB) 41 is referred to as a PCB board, an electronic circuit board, etc. Like all charging pile modules, the charging pile module in this embodiment converts AC power into DC power to charge the power battery. It consists of an input filter, a power factor correction circuit, a DC conversion circuit, and an output filter. The input filter filters the input mains power and removes any noise. The PFC circuit, also known as the power factor correction circuit, then converts the 220VAC mains power into a 400VDC output, improving the power factor while rectifying it. Compared to a simple rectifier circuit, this circuit improves the power factor. These two components are commonly used in power supply circuits and are highly mature technologies. These components primarily consist of capacitors, rectifiers, and other components. The DC conversion circuit primarily includes an inverter bridge circuit, including switches and a transformer. Like the input filter, the output filter also filters out noise to stabilize the output DC power. It primarily consists of components such as an inductor, a transformer, and a diode. The above-mentioned input filter, power factor correction circuit, DC conversion circuit, and output filter are all very mature technologies in power supply circuits, and various power supply modules will include these circuits. This embodiment classifies the specific components used in these circuit modules, mainly dividing these components into semiconductor devices with high heat generation, such as MOS tube 4111 (used as a switch tube, rectifier tube, etc.). Some diodes can also be replaced by these MOS tubes. Another component with high heat generation is the coil. The wire used in the coil itself has a certain resistivity. If the wire of the coil winding is long enough, its resistance will also be large enough. Due to the large current flowing through, the heat generation is very considerable. Therefore, it is also the focus of attention when doing heat dissipation. The coil winding mainly has two components: one is inductor 4121, and the other is transformer 4122. Both are components with high heat generation, especially in high-power power supplies such as charging piles. Therefore, the heat dissipation of transformer 4122 and inductor 4121 is the focus of attention.

[0033] In this embodiment, in order to achieve heat dissipation of the charging pile module, a special radiator 42 is designed, such as Figure 5 The heat sink 42 shown is stamped from a single piece of aluminum alloy and includes a heat-absorbing surface 421 that contacts the printed circuit board 41. Behind the heat-absorbing surface 421 is a heat-dissipating surface 422 provided with heat-dissipating teeth 4221. Heat generated by the power devices on the PCB is absorbed by the heat-absorbing surface 421 and then conducted to the heat-dissipating surface 422 on the opposite side by the high thermal conductivity of the aluminum alloy. On the heat-dissipating surface 422, the heat-dissipating teeth 4221 increase the heat-dissipating area, allowing the heat to be quickly dissipated into the air.

[0034] In this embodiment, heat absorbing surface 421 is provided with a heat absorbing surface 4211 connected to the heat dissipation surface of the high-power semiconductor device and a heat absorbing groove 4212 filled with a heat-conducting liquid. The winding coil components are immersed in the heat-conducting liquid. The winding coil components include an inductor 4121 and a transformer 4122, and the high-power semiconductor device includes a MOS transistor 4111.

[0035] In this embodiment, the printed circuit board 41 includes an inductor sub-board 413 to which an inductor 4121 is soldered, a transformer sub-board 414 to which a transformer 4122 is soldered, and a main printed circuit board 415 to which other components are soldered. In this embodiment, the coil winding components, such as the transformer 4122 and inductor 4121, on the PCB are collectively immersed in a thermal conductive fluid. Currently, thermal conductive fluids, also known as thermal oils or thermal adhesives, are commercially available products and can be used by those skilled in the art. The thermal conductive fluid is filled around the coil windings to promptly dissipate heat generated by the coil windings. This provides a better heat dissipation effect than exposing the coil windings to air. This is because the thermal conductive fluid itself is a good conductor of heat compared to air and can more quickly absorb the heat generated by the coil windings. High-power semiconductor devices are packaged and have a metal surface for heat dissipation. For example, some MOS transistors have a metal housing in addition to three pins, providing a heat dissipation surface.

[0036] In this embodiment, the heat absorption tank 4212 includes an inductor heat absorption tank 4212-1 and a transformer heat absorption tank 4212-2; the coil of the inductor 4121 is immersed in the heat-conducting liquid in the inductor heat absorption tank 4212-1, and the inductor sub-board 413 is sealed and covered in the notch of the inductor heat absorption tank 4212-1; the coil of the transformer 4122 is immersed in the heat-conducting liquid in the transformer heat absorption tank 4212-2, and the transformer sub-board 414 is sealed and covered in the notch of the transformer heat absorption tank 4212-2. The main printed circuit board 415 is supported on the heat absorption surface 421 by a metal rod 4151, and the MOS tube 4111 is fixed to the heat absorption surface 421 by a bolt 4152. The heat dissipation plane of the MOS tube 4111 is close to the heat absorption plane 4211 on the heat absorption surface 421, and the pins of the MOS tube 4111 are welded to the main printed circuit board 415. Figure 6As shown, these MOS transistors 4111 are fixed to the heat dissipation surface 421 of the heat sink 42 by bolts. In this embodiment, the heat absorption surface 421 of the heat sink 42 has two heat absorption structures. One is the heat absorption plane 4211, which is mainly used to dissipate heat from high-power semiconductor devices such as the MOS transistor 4111. As we know, high-power devices such as the MOS transistor 111 generally require packaging, such as general integrated circuits and MOS transistors. These devices have a heat dissipation plane on the package. This heat dissipation plane is basically a metal surface that dissipates heat within the package. Therefore, the heat dissipation surface of this device is closely attached to the heat absorption plane 4211 on the heat absorption surface 421, which is allocated for dissipating heat from the MOS transistor. The heat absorption plane 4211 quickly absorbs heat from the heat dissipation surface of the MOS transistor 4111 and conducts it to the heat dissipation teeth 4221 on the opposite heat dissipation surface 422 to dissipate it into the air.

[0037] In this embodiment, the heat dissipation characteristics of coil windings and high-power semiconductor devices such as MOS tubes are combined. Winding-type devices such as inductors and transformers are cooled by filling the surrounding heat-conducting liquid, while high-power semiconductor devices such as MOS tubes are cooled by closely contacting the heat dissipation surface with the heat absorption surface. The advantages of each are fully utilized to increase the heat dissipation. At the same time, natural heat dissipation is achieved by means of natural air flow, resulting in good heat dissipation effect.

Claims

1. A naturally heat-dissipating charging pile, comprising a charging pile body (1) mounted on a base (101), a front cover (2) arranged in front of the charging pile body (1), a rear cover (3) arranged behind the charging pile body (1), and at least one charging pile module (4) mounted on the charging pile body (1); characterized in that: The charging pile module (4) comprises a printed circuit board (41) provided with a charging module circuit and a radiator (42); the radiator (42) comprises a heat absorbing surface (421) close to the printed circuit board (41), and a heat dissipation surface (422) uniformly distributed with heat dissipation teeth (4221) on the back of the heat absorbing surface (421); when the charging pile module (4) is installed on the charging pile body (1), the heat dissipation surface (422) faces the rear cover (3), the heat dissipation teeth (4221) are arranged perpendicular to the ground, an air inlet (31) is provided at the bottom of the rear cover (3), and an air outlet (32) is provided at the top; the air inlet (31), the channel between the heat dissipation teeth (4221), and the air outlet (32) form a heat dissipation channel for cold air to enter the charging pile from the air inlet (31), absorb heat between the heat dissipation teeth (4221), and form hot air to be discharged from the air outlet (32).

2. The natural heat dissipation charging pile according to claim 1, characterized in that: The air inlet (31) and the air outlet (32) are both inclined air outlets.

3. The natural heat dissipation charging pile according to claim 2, characterized in that: Four charging pile modules (4) are provided on the charging pile body (1), namely, upper, lower, left, and right; each heat dissipation tooth (4221) of the upper charging pile module (4) is in a straight line with each heat dissipation tooth (4221) of the lower charging pile module (4).

4. The natural heat dissipation charging pile according to claim 2, characterized in that: A fan (4222) is also provided between the upper and lower charging pile modules (4) to accelerate the flow of air from bottom to top.

5. The natural heat dissipation charging pile according to claim 1, 2, 3 or 4, characterized in that: A heat absorbing plane (421) connected to the heat dissipation plane of a high-power semiconductor device in the charging pile module circuit and a heat absorbing groove (4212) filled with a heat-conducting liquid are provided on the heat absorbing surface (421) of the radiator (42) of the charging pile module (4). The winding coil device in the circuit of the charging pile module (4) is immersed in the heat-conducting liquid.

6. The natural heat dissipation charging pile according to claim 5, characterized in that: The winding coil device includes an inductor (4121) and a transformer (4122), and the high-power semiconductor device includes a MOS tube (4111).

7. The natural heat dissipation charging pile according to claim 6, characterized in that: The printed circuit board (41) includes an inductor sub-board (413) on which all inductors (4121) are welded, a transformer sub-board (414) on which all transformers (4122) are welded, and a main printed circuit board (415) on which other components are welded.

8. The natural heat dissipation charging pile according to claim 7, characterized in that: The heat absorption groove (4212) includes an inductor heat absorption groove (4212-1) and a transformer heat absorption groove (4212-2); all the inductor (4121) coils are immersed in the heat-conducting liquid in the inductor heat absorption groove (4212-1), and the inductor sub-plate (413) is sealed and covers the groove opening of the inductor heat absorption groove (4212-1); all the transformer (4122) coils are immersed in the heat-conducting liquid in the transformer heat absorption groove (4212-2), and the transformer sub-plate (414) is sealed and covers the groove opening of the transformer heat absorption groove (4212-2).

9. The natural heat dissipation charging pile according to claim 8, characterized in that: The main printed circuit board (415) is supported on the heat absorbing surface (421) by a metal rod (4151); the MOS tube (4111) is fixed on the heat absorbing surface (421) by a bolt (4152); the heat dissipation plane of the MOS tube (4111) is close to the heat absorbing plane (4211) on the heat absorbing surface (421); and the pins of the MOS tube (4111) are welded on the main printed circuit board (415).

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