Last year, the global ban on fuel trucks was released, letting people realize that the era of new energy vehicles is coming, and pure electric vehicles, plug-in hybrids, fuel cell vehicles, etc., why is it a future in just a few years? The main theme? On the one hand, it supports global strategy and policy. On the other hand, it is the continuous improvement of power battery technology. Longer battery life and shorter charging time are directly related to the user's commuting needs. Only new energy vehicles come to us. In the future, it will replace the traditional fuel car, which is inseparable from everyone's daily travel. Then there is what people say: "The development of new energy vehicles is the development of battery technology."
Lead-acid batteries
Pure electric vehicles were first used in lead-acid batteries, lead and its oxides were used as electrode materials, and sulfuric acid solutions were used as electrolytes. This is the power source for most electric bicycles today, and low cost is its biggest advantage. However, because the energy density of the lead-acid battery is low, it brings about problems such as large volume and small capacity, and cannot satisfy the control of one car for its own weight, the consumption of driving force, and the service life of more than 10,000 kilometers per year. Can not be used on a large-scale production car, and eventually eliminated by car manufacturers.
Sealed packaging lead-acid battery pack
NiMH batteries
Nickel-metal hydride batteries are very close to our daily life. It is very common to hear small electric appliances such as rechargeable toothbrushes from the early days. The positive electrode is a compound of nickel-hydrogen, and the negative electrode is a metal hydride. The energy density, charge and discharge times are compared. The lead-acid battery has a small improvement, and the electrolyte is non-flammable, safe and secure, and the manufacturing process is mature. BYD is the world's second largest nickel-hydrogen battery manufacturer before the car is built.
NiMH battery pack
However, because of the general charging efficiency of nickel-metal hydride batteries, the memory effect of charging, and the low operating voltage (the high-voltage fast charging cannot be used), it is not suitable for the single power source of automobiles, and is suitable for auxiliary engine operation. The best thing to do in this area is Toyota. The hybrid system uses Atkinson engine + NiMH battery pack. The Atkinson engine itself has the advantage of high efficiency in the intermediate speed range, but it also has the problem of low speed and high speed. Ni-MH batteries are just a big help to solve the problem of starting and high-speed power.
Since the widespread use of lithium batteries, nickel-metal hydride batteries have also been completely replaced in the car, such as Toyota's new hybrid system has adopted a more efficient engine + lithium battery combination. Compared with lithium batteries, the capacity of nickel-metal hydride batteries, the life of cycle charging and environmental protection are not dominant, and the cost advantage is also weakened by the development of lithium batteries. This is why nickel-metal hydride batteries gradually withdraw from the automotive field. Where.
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