How to solve the heat dissipation problem if the new energy electric vehicle charging pile (station) is overheated?
Compared with other power sources, the system heat dissipation of the charging pile is much larger, and the requirements for the thermal design of the system are extremely strict. The power range of DC charging piles is 30KW, 60KW and 120KW, and the efficiency is generally around 95%, so 5% of it will be converted into heat loss, and the heat loss will be 1.5KW, 3KW and 6KW. For outdoor equipment, this heat must be discharged outside the equipment, otherwise it will accelerate the aging of the equipment, and it is necessary to do a good job of waterproof and dustproof treatment to prevent short circuit of electronic equipment and signal disturbance.
Understanding the heat of the charging pile: In order to give you an intuitive understanding of how much heat is generated during the charging of the charging pile? We compare the charging pile with a power of 60KW and the communication power cabinet: The current mainstream module efficiency in the industry is nominally 95%. Taking a 60KW system as an example, the heat dissipation capacity of the module alone can reach 60*0.05*1000=3000W, which means that the charging pile is in During the charging process, the heat generated is 3 times that of the outdoor communication cabinet under the same volume.
The importance of heat dissipation of charging piles: The purpose of building charging facilities is to allow vehicles to be charged to replenish more than 50-60% of electrical energy in a short period of time. In practical applications, electric vehicles generally use DC fast charging, which can be fully charged within 1~2H , And the AC power used in our home can only use the slow charging mode and it takes 6-8h to be fully charged. An important factor in the promotion of new energy vehicles is the convenience of the use process. Therefore, the faster the better for the charging demand of electric vehicles, but as the charging speed increases, the current and voltage will increase linearly, which leads to The power of the inductance module of the charging pile is increased. Components such as inductor modules and power modules generate heat quickly and in large amounts. It can be seen that the charging pile generates a large amount of heat during the charging process. If it is not released in time, it will cause a great safety accident. Therefore, the heat dissipation problem is one of the problems that must be solved in the promotion and construction of the charging pile system!
There are currently four commonly used cooling modes: natural cooling (mainly relying on heat sinks), forced air cooling, water cooling, and air conditioning. Due to factors such as volume, cost, reliability, etc., most companies currently use forced air cooling for processing. Then, this is bound to bring interference such as dust, corrosive gas, and moisture.
The heat dissipation of the charging pile is divided into two parts: the module heat dissipation and the overall heat dissipation of the chassis. Because the charging module is built in, the protective measures are mainly reflected in the chassis design. The simplest and most economical design is to make the air inlet and outlet of the cabinet into a louver type, and then add a fan to the air outlet to remove the heat from the module fan. This method can play a certain protective role. It is still inevitable that dust and moisture will enter. If you want a better protection effect, you can use a closed cold and heat isolation air duct to isolate the interior from heat and cold (as shown in the figure below): the middle partition separates the cold and hot fluids completely, and the heat transfer carrier and the top fan are used to efficiently cool down , The air inlets and outlets at both ends use louver filter net groups, which are effectively waterproof and dustproof.
