Why are new energy vehicles equipped with lead-acid batteries?
The batteries of traditional automobiles and new energy vehicles are divided into lead-acid batteries, nickel metal batteries, lithium ion and lithium polymer batteries, high temperature sodium batteries, metal air batteries, super capacitors, flywheel batteries, solar cells and graphene batteries, etc. There are two kinds of starting power supply and power supply. So far, electric vehicles are still inseparable from lead-acid batteries.
Because lead-acid batteries in new energy vehicles are weak current (weak and mild hybrid) batteries, in general, these batteries provide power for on-board electronic equipment before the power battery is not powered. For example, remote key recognition, vehicle unlocking, and large-screen display of the instrument are the same as those of ordinary fuel vehicles powered by batteries.
In the car circuit, the power lithium battery is connected to the lead-acid battery. If the lead-acid battery runs out of power, the power battery can charge it. For example, when the driver turns on the radio, the radio will be cut off at the moment when the engine is ignited. The same is true of the lights. The radio uses lead-acid batteries instead of power lithium batteries.
The reason why new energy vehicles still use lead-acid batteries is that the cost of such batteries is low, there are many suppliers, and they are easy to maintain and replace, while lithium batteries are complicated to manufacture, and most batteries cost twice as much as lead-acid batteries. The special feature is that lead-acid batteries have experienced more than 100 years of development, with more stable quality and high reliability.
In addition, automobiles are used in a variety of environments - high temperature, cold, moisture, bumps and vibrations, and batteries must have high stability and reliability as a must-have for automobiles. The advantages of lead-acid batteries are revealed.
As for what is weak and light mixing. In fact, the weak hybrid system was also called a micro-hybrid. This kind of hybrid system does not have a separate high-voltage battery, and generally uses a 12-volt power supply to drive the motor. Now many models with automatic engine start and stop can be regarded as micro-hybrid. powered car. The motor power of the mild hybrid system is higher than that of the weak hybrid system. At present, the mainstream models are driven by 48 volts. During the working process of this system, the motor can not only start and stop the engine, but also provide auxiliary power when the vehicle accelerates.
It can be seen that although new energy vehicles use lithium batteries as power sources, they are equipped with lead-acid batteries as low-voltage auxiliary batteries to supply power to their 12V power system to wake up high-voltage lithium battery systems, which is a potentially large market.
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