Is PTC heater irreplaceable in new energy vehicles?
New energy vehicles are inseparable from PTC heating elements. PTC is a positive temperature coefficient thermistor added to the car. When the temperature is low, the resistance is small and heats up quickly. After the temperature rises, the resistance gradually increases and the power decreases, so it has the function of automatic constant temperature. Not only high thermal efficiency, but also a high safety factor. Therefore, the application range of PTC heaters is very wide, and the shadow of PTC can be seen in almost all heating and heat preservation occasions, especially for new energy vehicles, there is currently no better alternative.
The reason why new energy vehicles are inseparable from PTC originals is the demand for air conditioning and heating. On the other hand is the battery thermostat circuit.
Traditional car heating is very simple, and the waste heat of the engine can be directly used. However, new energy vehicles have no engine waste heat to use. You can't drive in a leather jacket in winter, not to mention the glass needs to be defrosted. Some car manufacturers use heat pump air conditioners, but the efficiency is not high in winter, but it is not as real and direct as PTC. Most of the new energy vehicles, at least 99% of the new energy vehicles use PTC heating for heating. But the remaining 1% is to use the waste heat of the motor for heating, the brain hole is relatively large! That 1% is Tesla!
The temperature of the motor will rise when it is working, and the temperature can be raised to keep warm! But how to keep warm when the motor is not working? The answer is still electric motor heating, how to do it? In the static state, by blocking the rotor, that is, adding a current to the motor, the coil power is about 3kw. In this way, PTC and related control lines are saved and costs are reduced.
In addition to heating, PTC is also used to warm the battery.
Not only battery discharge capacity at low temperature Reduced, and the charging efficiency is also very low, and even can not be charged. Therefore, it is necessary to warm up the battery before charging when the temperature is low in winter. At this time, the original PTC is used! Use the electric energy of the charging gun to heat the battery, and the charging speed is faster after the temperature rises. At the end of charging, as long as the gun is not drawn, the heat preservation program will always work.
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