How to analyze the thermal management subsystems of new energy vehicles?
The thermal management of new energy vehicles is mainly to adjust the temperature of the battery, motor, electronic control and passenger compartment to ensure that they work at the most suitable temperature. Since there is no engine heat source, new energy vehicles generally require additional heating devices to supplement the heat of the system. Commonly used heating devices include PTC heaters, diesel heaters and heat pump air conditioners. Under the trend of electrification, the thermal management system of the whole vehicle has undergone major changes. New energy vehicles without a heat engine need additional heat generating devices to maintain the efficient operation of the entire system. The high temperature sensitivity of the battery makes the thermal management of new energy vehicles complex. The degree and level of sophistication requirements are also constantly increasing.
New energy vehicle thermal management architecture New energy vehicle thermal management system can be divided into battery system thermal management, air conditioning system thermal management and motor electronic control system thermal management; battery system thermal management and air conditioning system thermal management include cooling and heating Two major functions, the thermal management of the motor electronic control system is mainly cooling.
New energy vehicle battery system thermal management
PTC Heater
The PTC heating solution with low cost, simple structure and stable operation has become a heating solution commonly used in the new energy vehicle industry. According to their different working methods, PTC heaters can be divided into PTC air heater and PTC water heater.
PTC Air Heater
1. The PTC air heating heater directly heats the air flowing through the surface of the heater, and then blows it into the car through the blower to achieve the effect of warm air;
2. The cost is low, the heating is fast and the temperature is high, but the warm air is very dry and the comfort is low;
3. The high-voltage PTC is directly connected to the passenger compartment, which has certain safety risks.
PTC Water Heater
1. The PTC water heating heater uses a water heater to indirectly heat the air. The heater first heats the water, and the hot water flows into the warm air core to exchange heat with the cold air, and the heated cold air is sent into the passenger compartment;
2. The heat loss is small, and it is a relatively mature and safe heating solution at present;
3. Widely used in electric vehicles.
