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Electric vehicle charger air-cooling system conducting precooling through chilled water and control method thereof

An air-cooling system, electric vehicle technology, applied in electric vehicles, battery circuit devices, cooling/ventilation/heating renovation, etc., can solve the problems of accelerated failure of devices, cracking of hard coatings, and reduced insulation performance of devices

Active Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical substances in the condensed water corrode the internal structure of the device, and the salt in the condensed water reduces the internal insulation performance of the device, resulting in accelerated failure of the device
[0007] The existing process is to spray three anti-corrosion coatings inside the electric vehicle charging module. After curing, a transparent hard protective film will be formed on the surface of the device, which can prevent moisture, mildew and salt spray. Stress will cause the hard coating to crack along with the surface of the device, thus losing its protective effect

Method used

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  • Electric vehicle charger air-cooling system conducting precooling through chilled water and control method thereof
  • Electric vehicle charger air-cooling system conducting precooling through chilled water and control method thereof
  • Electric vehicle charger air-cooling system conducting precooling through chilled water and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] The program flow chart corresponding to the cooling subroutine in the constant current charging stage in Embodiment 1 is as follows Figure 4 Shown:

[0148] The cooling subroutine in the constant current charging stage is as follows: the chilled water in the cooling coil is at the lowest flow rate, and the air inlet fan and the air outlet fan are at the lowest speed; as the temperature of the power device gradually increases, gradually increase the chilled water flow rate; When the flow of chilled water reaches the maximum and the temperature of the power device is still at the temperature control upper limit, gradually increase the speed of the inlet fan and the fan of the outlet; when the flow of chilled water and the speed of the fan both reach the maximum, the temperature of the power device remains When it is at the upper limit of temperature control, maintain the maximum flow of chilled water and the maximum speed of the fan, the device will alarm and request man...

Embodiment 2

[0180] The cooling subroutine in the constant current charging stage in Embodiment 2 is the same as the cooling subroutine in the constant current charging stage in Embodiment 1.

[0181] The constant voltage charging stage dehumidification subroutine in embodiment 2 is as Figure 9 Shown:

[0182] The dehumidification subroutine in the constant voltage charging stage is: increase the flow rate of chilled water in the cooling coil to the maximum, maintain the original speed of the air inlet fan and the air outlet fan; gradually reduce the speed of the air inlet fan and the air outlet fan; when the temperature of the power device is higher than the air temperature outside the cabinet, the speed of the fan is reduced to the minimum, and when the temperature of the power device is at the lower limit of temperature control, keep the minimum speed of the fan and the maximum flow rate of chilled water; when the temperature of the power device is higher than the air temperature outs...

Embodiment 3

[0199] The structure and device layout of the dust removal and dehumidification device in embodiment 3 are as follows: Figure 12 Shown:

[0200] The dust removal and dehumidification device in the third embodiment makes the following changes on the basis of the air inlet precooling device in the second embodiment:

[0201] An electrostatic air filter 22 is installed in the air duct in the box body 2. Along the airflow direction in the air duct, the air inlet 6, protective shutters 21, electrostatic air filter 22, air intake fan, refrigeration coil 15, S-shaped Air duct 23 and the air outlet 24 of box body.

[0202] The electrostatic dust-proof filter has a capture efficiency of more than 99% for small-sized dust with a particle size greater than 0.5 μm, and its filtering effect on PM10 and PM2.5 suspended particulate matter is significantly better than traditional dust-proof filters; The wind resistance is only one-third of that of the traditional dust-proof filter. When th...

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Abstract

The invention provides an electric vehicle charger air-cooling system conducting precooling through chilled water and a control method of the electric vehicle charger air-cooling system. The system comprises a cabinet, wherein a lower back plate of the cabinet is provided with an air inlet, and an upper front face plate of the cabinet is provided with an air outlet; an air inlet fan and a refrigerating coil are sequentially arranged at the front end of the air inlet, and a pipeline of the refrigerating coil is vertically arranged at one end of an air inlet of an S-shaped air pipe; an air outlet of the S-shaped air pipe points to the upper front of the cabinet; the refrigerating coil is made of heat conduction continuous carbon fiber reinforced polymer (CFRP) matrix composites; an exhaust fan and a charging module are sequentially arranged at the rear end of the air outlet of the cabinet; a control device is arranged above the charging module. With respect to a high-power indoor charger, the system avoids the situation that the cooling effect is poor because hot air accumulates in a charging room; with respect to an outdoor charger, the system solves the contradiction between cabinet shell protection and power device heat dissipation and enables a high-power charger to become the outdoor charger and be installed, put into operation and used outdoors.

Description

Technical field: [0001] The invention relates to an air-cooling system and a control method for an off-board charger of an electric vehicle, in particular to an air-cooling system and a control method for precooling the intake air of the charger for an electric vehicle by using chilled water. Background technique: [0002] The electric vehicle charger adopts a modular configuration, and multiple charging modules of the same model in the cabinet operate in parallel, output the same voltage, and share the load current together. With the improvement of circuit topology and the application of magnetic integration technology, the switching frequency and power density of the charging module continue to increase, and the volume of the housing is significantly reduced. However, the fan speed increases accordingly, and ventilation and heat dissipation become particularly important. For power electronic equipment, the general operating temperature is reduced by half for every 10°C inc...

Claims

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Application Information

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IPC IPC(8): H02J7/00H05K7/20
CPCH02J7/0042H05K7/20909
Inventor 赵梦欣余伟成孙仿田阳刘宁
Owner STATE GRID CORP OF CHINA
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