As the drive of pure electric new energy vehicles, the motor can achieve extremely low or zero emissions. During the driving and energy recovery process of pure electric vehicles, the stator core and stator windings of the motor will generate losses during the motion process, and these losses will be dissipated in the form of heat, so effective cooling media and cooling methods are required. Take away the heat to ensure the safe and reliable operation of the motor in a stable ventilation system with balanced cooling and heating cycles. The design of the motor cooling system will directly affect the safe operation and service life of the motor.

The motor that adopts the air-cooled heat dissipation method has its own coaxial fan to form the internal air circulation or external air circulation, and the fan generates enough air volume to take away the heat generated by the motor. The medium is the air around the motor, the air is directly sent into the motor, absorbs heat and then is discharged to the surrounding environment. Air cooling is characterized by relatively simple structure and low motor cooling cost, but the heat dissipation effect and efficiency are not very good, the work reliability is poor, and the requirements for weather and environment are relatively high.

The motor that uses water cooling as a heat dissipation method will introduce the coolant into the hollow conductor of the stator or rotor through pipes and passages, and the circulating coolant will flow continuously to take away the heat generated by the rotor and stator of the motor to achieve cooling of the motor. Purpose. Although the cost of water cooling is slightly higher than that of air cooling, its cooling effect is more significant than that of air cooling, and it has uniform heat dissipation, high efficiency, strong working reliability, and less noise. As long as the whole device can have a good mechanical seal, it can be used in various environments.

Comparison of water-cooled heat dissipation and air-cooled heat dissipation for new energy vehicles:

Cooling method	advantage	shortcoming
water cooling	1. Uniform heat dissipation, high heat dissipation efficiency, and good heat dissipation effect;  2. Strong working reliability;  3. Good weather resistance, less affected by the environment;  4. Relatively small noise;	1. The heat dissipation system has a complex structure and high safety requirements;  2. High cost;  3. After-sales maintenance is difficult;
air cooled	1. The heat dissipation system has a simple structure, fewer parts and light overall weight;  2. Low cost;  3. Less difficult after-sales maintenance;	1. Uneven heat dissipation, low heat dissipation efficiency, and poor heat dissipation effect;  2. Poor working reliability;
Note: The mainstream heat dissipation method of motors in the industry is water cooling.

The principle of water cooling and heat dissipation for new energy vehicles:

Water pipelines are reserved in the design of the power battery and drive motor system. The drive motor generates heat when it works, and the coolant flows through the water jacket to take away the heat and enter the radiator of the water tank. The radiator is integrated with the electronic fan, and the electronic fan accelerates the heat dissipation of the water tank to cool down the coolant and reach the normal operating temperature required by the drive motor. The cooled coolant flows through the drive motor again, and the cycle goes on and on.

The components of the new energy vehicle water cooling system:

1. The water tank radiator is mainly used to cool the coolant entering the chip. From the material, it is divided into copper water tank and aluminum water tank. From the internal structure, it is divided into plate-fin type, tube-belt type and tube-fin type.

2. Electronic fan. Different engine cooling systems and new energy vehicle cooling fans use electronic fans to dissipate heat. Different cooling systems have different electronic fans. Yili Technology ATS motor cooling system can match one fan version or two fan versions according to the power of the drive motor. Generally, the heat dissipation of two electronic fans is enough to meet all the common pure electric vehicles on the market. Because hybrid vehicles also have engines and turbocharger devices, they need more electronic fans, generally no more than 6.

3. Electric control system. The electronic control system mainly includes fan controllers, wiring harnesses, sensors, displays, etc. Yili Technology ATS includes an electronic control system, but from the perspective of the market as a whole, not all cooling systems of new energy vehicles have an electronic control system. With the help of the electronic control system, Yili Technology ATS can intelligently control the heat dissipation of new energy vehicles, which is no longer "stiff" like the traditional engine cooling system.

4. Electric water pump. The water pump is an indispensable component, and its main function is to provide power for the circulation of the coolant. The circulation of coolant between the drive motor and the electric control and the radiator of the radiator requires an electric water pump. Yili Technology ATS comes with electric water pump components, but some customers will choose the water pump brand alone. In terms of overall system stability, we do not recommend this.