Because the control system, obviously, can't use high pressure. Conventional control system chips are low-voltage. And some pure electric control extends the control system of the fuel vehicle. So the operating voltage is 12V.
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The use of low-voltage power supply is also impossible, electric vehicles to improve the power only to increase the voltage. Otherwise, the current is too large power supply and control are very difficult, for example, 10 kilowatt motor uses 12V power supply current of more than 800 amps, and the wire needs to be nearly 100 square millimeters. Which means a wire the size of your finger.
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drawback
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First of all, there are fewer people in the electric vehicle market, so the cost of electric vehicle maintenance is high, once there is any problem, then you must go to the 4S store for maintenance, so the price is at least one thousand yuan.
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Second, the market share of electric vehicles is very low, so the value added rate is even lower, the general newly bought electric vehicles, as long as the hands of consumers, direct depreciation of more than 60%, so down to buy a car consumers suffer heavy losses, can only use their own, sell words can be said to be extremely cost-effective.
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Third, the battery consumption of electric vehicles is also worth considering, generally speaking, the price of a group of batteries is at least three thousand yuan, so converted, your electric vehicle battery replacement at least sixty thousand or seventy thousand yuan! This price can almost buy a gasoline car, so be sure to consider the cost of this aspect when buying
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in order to improve efficiency
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The purpose of increasing the voltage is to improve the power, there are several reasons for not using the inverter to boost the voltage, 1) the efficiency is low, the efficiency of the general inverter is less than 70%, which directly leads to the use of the battery time (that is, the mileage) becomes shorter. 2) The power is large, if the low voltage through the inverter boost, the low voltage side (battery) power supply current is too large, such as the use of 12V battery, the power is 1000W, then the low voltage side current reaches more than 100 A, the line, the battery requirements are not low, at the same time, such an inverter will not be cheap. Or many other reasons not to say more, so you should understand it. This is not a technical problem, but simply not practical. Just like power transmission, we all use high-voltage power transmission, instead of using 220V power transmission.