Charging pile liquid cooling shielding system for EMC test environment and charging pile

Abstract

The invention provides a charging pile liquid cooling shielding system for an EMC test environment and a charging pile, and the system comprises a metal shielding box which is composed of an assembly type box body and an openable and closable box cover; the liquid cooling circulating pump is arranged in the metal shielding box; the cooling pipeline is connected with the liquid cooling circulating pump; the cooling pipeline penetrates through the box wall of the metal shielding box through a waveguide tube and then is integrated in an overcharge gun line of the charging pile; and a power line and a control line of the liquid cooling circulating pump penetrate through the box wall through the filter. Through the combined design of the metal shielding box, the filter and the waveguide tube, electromagnetic interference generated by the liquid cooling system is suppressed in the box body, and interference on a vehicle EMC test result in the anechoic chamber is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging pile liquid cooling shielding system and a charging pile for an EMC test environment. Background Art

[0002] With the rapid development of the new energy vehicle industry, the demand for charging methods and power is increasing. Conventional slow charging can no longer meet the rapidly growing demand, especially the demand for fast charging. In order to shorten charging time and target high-power new energy vehicles, the concept of super charging piles has been continuously introduced in the market.

[0003] For common slow charging and fast charging, the power is basically below 250Kw, and the cooling method used is air cooling. However, with the emergence of super charging, the power has increased to 500kW or even higher to the megawatt (MW) level, which can greatly shorten the charging time, but it also brings the problem of increased cable cross-sectional area. In order to reduce the cable cross-sectional area as much as possible, it is also to solve the heat dissipation problem. For super charging piles, air cooling cannot be used, and liquid cooling must be used, which can greatly reduce the cross-sectional area of ​​the cable.

[0004] While the liquid cooling solution solves the cable cross-sectional area and heat dissipation issues, it also adds a liquid cooling device to the system, making the charging pile system more complex and introducing new challenges. This is especially true when conducting electromagnetic compatibility performance tests in an anechoic chamber during supercharging of new energy vehicles, which introduces additional influencing factors. During vehicle charging mode testing, the charging piles are placed a considerable distance from the vehicle (usually 30 meters away). The charging gun cable, cooling system, refrigerant medium, and refrigerant pipes are all subject to distance restrictions and cannot be too far from the vehicle, generally needing to be kept within 5 meters. Otherwise, the cooling effect will be affected, posing a safety hazard.

[0005] The liquid cooling system itself includes a motor, control, and feedback systems, requiring a 24V DC power supply and liquid refrigerant transmission pipelines. These components generate interference, and the interference of the liquid cooling system itself must be addressed to ensure that it does not affect normal vehicle EMC testing. Therefore, the background noise of the liquid cooling system must be addressed. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a charging pile liquid cooling shielding system and a charging pile for use in an EMC test environment.

[0007] According to the present invention, a charging pile liquid cooling shielding system for an EMC test environment includes:

[0008] Metal shielding box, consisting of an assembled box body and an openable and closable box cover;

[0009] a liquid cooling circulation pump disposed in the metal shielding box, and a cooling pipeline connected to the liquid cooling circulation pump;

[0010] The cooling pipeline penetrates the wall of the metal shielding box through a waveguide and is integrated into the supercharging gun line of the charging pile;

[0011] The power line and control line of the liquid cooling circulation pump pass through the filter and penetrate the box wall.

[0012] Preferably, the metal shielding box adopts an assembled structure, is fixed by countersunk screws, and the connecting seams are provided with flexible material radio frequency seals.

[0013] Preferably, a honeycomb hole heat dissipation structure is provided on the metal shielding box, and the aperture of the honeycomb hole is designed to meet the shielding effectiveness of 9kHz-40GHz frequency band ≥70dB.

[0014] Preferably, the shielding effectiveness of the metal shielding box meets the following requirements in the frequency band of 9kHz-40GHz: the magnetic field attenuation is ≥70dB and the electric field attenuation is ≥100dB at 9kHz; the magnetic field attenuation is ≥90dB and the electric field attenuation is ≥100dB at 100kHz; the electric field and plane wave attenuation is ≥100dB at 1MHz-18GHz; and the plane wave attenuation is ≥90dB at 40GHz.

[0015] Preferably, the background noise level of the metal shielding box is more than 10dB lower than the corresponding standard limit in the 30MHz-18GHz frequency band of the vehicle darkroom and the 150kHz-2.5GHz frequency band of the CISPR25 darkroom when there is no EUT.

[0016] Preferably, the openable and closable box cover is supported by a hydraulic rod, and the opening and closing angle of the openable and closable box cover is 0°-90°.

[0017] Preferably, the waveguide tube adopts a metal tube structure or a non-metal tube structure with a metal coating on the inner wall.

[0018] A charging pile provided according to the present invention includes the charging pile liquid cooling shielding system for an EMC test environment.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention suppresses the electromagnetic interference generated by the liquid cooling system (motor, control circuit, etc.) within the box through the combined design of a metal shielding box (assembled structure + flexible RF seal), a filter (power line / control line) and a waveguide tube (refrigerant tube), thereby avoiding interference with the vehicle EMC test results in the anechoic chamber.

[0021] 2. This invention integrates a liquid cooling system with the supercharging gun cable, limiting the gun cable length to less than 5m. Liquid cooling replaces traditional air cooling, significantly reducing the cable cross-sectional area. This not only meets the cooling distance restrictions in EMC testing (avoiding the impact of excessively long cables on cooling), but also improves the portability of the gun cable and reduces the complexity of charging operations and safety hazards (such as the risk of entanglement of large-cross-sectional cables).

[0022] 3. The liquid cooling solution of the present invention solves the heat dissipation bottleneck of traditional air cooling in supercharging scenarios (power ≥ 500kW), enabling super charging piles to adapt to megawatt-level power requirements, shortening charging time while avoiding safety issues such as cable overheating and insulation aging through cross-sectional area optimization, providing a hardware foundation for high-power charging.

[0023] 4. The metal shielding box of the present invention achieves an attenuation of ≥70dB in the 9kHz-40GHz frequency band, ensuring that the background noise of the test environment meets the requirements of standards such as EN55022 and CISPR25 (more than 10dB lower than the limit when there is no EUT), thereby improving the accuracy of the test data.

[0024] 5. This invention solves the problem that traditional commercial liquid-cooled charging piles do not take into account the interference of the test environment, enabling the supercharging system to be directly applied to anechoic chamber testing without additional modification, thus simplifying the EMC certification process for new energy vehicles and shortening the test cycle.

[0025] 6. The metal shielding box in the present invention adopts a hydraulic rod to support the cover plate, which is convenient for the installation, commissioning and maintenance of the liquid-cooled circulating pump; the honeycomb hole heat dissipation structure ensures the shielding performance while ensuring the system heat dissipation efficiency and improving the equipment reliability through the optimized design of aperture and area (such as avoiding electromagnetic leakage caused by large aperture). BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0027] Figure 1 This is a connection diagram of the charging pile system in the present invention;

[0028] Figure 2 This is a connection diagram between the liquid cooling pump and the gun line in the present invention. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, without departing from the scope of the present invention, a number of variations and improvements may be made by those skilled in the art. These all fall within the scope of protection of the present invention.

[0030] The present invention discloses a charging pile liquid cooling shielding system for EMC test environment, referring to Figure 1 and Figure 2 The system comprises a metal shielding box consisting of an assembled box body and a retractable cover; a liquid-cooling circulating pump housed within the metal shielding box, and a cooling pipeline connected to the liquid-cooling circulating pump; the cooling pipeline is integrated into the charging pile's supercharging gun cable after penetrating the metal shielding box wall via a waveguide; the power and control lines of the liquid-cooling circulating pump pass through the box wall via a filter. The waveguide is a metal tube structure or a non-metallic tube structure with a metal-plated inner wall.

[0031] Regarding the connection design of the gun cable and liquid cooling system: the supercharger gun cable length is set to be controlled within 5m, and the cable cross-sectional area is reduced to 1 / 3 of the traditional air cooling solution through liquid cooling design (for example, in a 500kW power scenario, the traditional cable cross-sectional area needs to be ≥150mm 2 , the liquid cooling solution can be reduced to 50mm 2 The liquid cooling circulation pump is connected to the charging gun cable input. A transparent tube (such as PVC or fluororubber) connects the liquid cooling line water inlet pipe and the refrigerant pipe to ensure a sealed refrigerant (such as ethylene glycol-water solution) circulation path. A temperature sensor is integrated within the gun cable to monitor the cable temperature in real time and provide feedback to the liquid cooling system control module.

[0032] The metal shielding box is assembled and secured with countersunk screws. The joints are sealed with flexible RF seals. The retractable lid is supported by hydraulic rods and can be opened and closed from 0° to 90°. The metal shielding box features a honeycomb heat dissipation structure, with apertures designed to achieve a shielding effectiveness of ≥70dB in the 9kHz-40GHz frequency band.

[0033] Shielding effectiveness design in EMC testing: The shielding effectiveness of the metal shielding box meets the following requirements in the frequency band of 9kHz-40GHz: magnetic field attenuation ≥70dB, electric field attenuation ≥100dB at 9kHz; magnetic field attenuation ≥90dB, electric field attenuation ≥100dB at 100kHz; electric field and plane wave attenuation ≥100dB at 1MHz-18GHz; plane wave attenuation ≥90dB at 40GHz.

[0034] In a specific embodiment, the test frequency range is 9kHz to 40GHz, and is carried out in accordance with the latest standards of EN50147 and GB / T12190. The shielding performance meets the following requirements:

[0035] frequency Attenuation Field Source 9kHz ≥70dB magnetic field 9kHz ≥100dB electric field 100kHz ≥90dB magnetic field 100kHz ≥100dB electric field 1MHz ≥100dB magnetic field 1MHz ≥100dB electric field 100MHz ≥100dB electric field <1GHz ≥100dB plane wave >1GHz ≥100dB plane wave 10GHz ≥100dB plane wave (microwave) 18GHz ≥100dB plane wave (microwave) 40GHz ≥90dB plane wave (microwave)

[0036] Background noise design in EMC testing:

[0037] Vehicle darkroom: According to the Class B limit values ​​specified in standards EN55022 and GB9254, in the 30MHz-18GHz frequency band, when there is no EUT in the darkroom, and the turntable, antenna tower, CCTV monitor, and lighting are turned on normally, the background noise level of the space environment must be at least 10dB lower than the Class B limit values ​​specified in EN55022 and GB9254.

[0038] CISPR25 anechoic chamber: In the 150KHz-2.5GHz frequency band, when there is no EUT in the anechoic chamber, the background noise level of the space environment is more than 10dB lower than the Class 5 limit level in CISPR 25.

[0039] The present invention also discloses a charging pile, comprising the above-mentioned charging pile liquid cooling shielding system for an EMC test environment.

[0040] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0041] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A charging pile liquid cooling shielding system for EMC test environment, characterized in that: include: Metal shielding box, consisting of an assembled box body and an openable and closable box cover; a liquid cooling circulation pump disposed in the metal shielding box, and a cooling pipeline connected to the liquid cooling circulation pump; The cooling pipeline penetrates the wall of the metal shielding box through a waveguide and is integrated into the supercharging gun line of the charging pile; The power line and control line of the liquid cooling circulation pump pass through the filter and penetrate the box wall.

2. The charging pile liquid cooling shielding system for EMC test environment according to claim 1, characterized in that: The metal shielding box adopts an assembled structure, is fixed by countersunk screws, and the connecting seams are provided with flexible material radio frequency seals.

3. The charging pile liquid cooling shielding system for EMC test environment according to claim 1, characterized in that: A honeycomb hole heat dissipation structure is provided on the metal shielding box, and the aperture of the honeycomb hole is designed to meet the shielding effectiveness of 9kHz-40GHz frequency band ≥70dB.

4. The charging pile liquid cooling shielding system for EMC test environment according to claim 3, characterized in that: The shielding effectiveness of the metal shielding box meets the following requirements in the frequency band of 9kHz-40GHz: at 9kHz, the magnetic field attenuation is ≥70dB, and the electric field attenuation is ≥100dB; at 100kHz, the magnetic field attenuation is ≥90dB, and the electric field attenuation is ≥100dB; at 1MHz-18GHz, the electric field and plane wave attenuation is ≥100dB; at 40GHz, the plane wave attenuation is ≥90dB.

5. The charging pile liquid cooling shielding system for EMC test environment according to claim 1, characterized in that: The background noise level of the metal shielding box in the 30MHz-18GHz frequency band of the vehicle darkroom and the 150kHz-2.5GHz frequency band of the CISPR25 darkroom when there is no EUT is more than 10dB lower than the corresponding standard limit.

6. The charging pile liquid cooling shielding system for EMC test environment according to claim 1, characterized in that: The openable and closable box cover is supported by a hydraulic rod, and the opening and closing angle of the openable and closable box cover is 0°-90°.

7. The charging pile liquid cooling shielding system for EMC test environment according to claim 1, characterized in that: The waveguide tube adopts a metal tube structure or a non-metal tube structure with a metal coating on the inner wall.

8. A charging pile, characterized in that: A charging pile liquid cooling shielding system for an EMC test environment comprising any one of claims 1 to 7.

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