Hydrogen fuel cell / graphene battery who is more promising?

The global timetable for the ban on the sale of fuel vehicles last year made people realize that the era of new energy vehicles is coming, and why pure electric vehicles, plug-in hybrids, fuel cell vehicles, etc. have become the future in just a few years time. The main theme? On the one hand, it is supported by global strategies and policies. On the other hand, the continuous improvement of power battery technology, longer battery life, and shorter charging time are directly related to the commuting needs of users, so that new energy vehicles come to us. In the future, it will replace the traditional fuel vehicles and will be inseparable from everyone's daily travel. Therefore, people have said: "The development of new energy vehicles is the development of battery technology."

Lead-acid batteries

The earliest use of pure electric vehicles was lead-acid batteries. Lead and its oxides were used as electrode materials. Sulfuric acid solution was used as the electrolyte. This is the power source for most electric bicycles. Low cost is its greatest advantage. However, due to the low energy density of lead-acid batteries, the problems such as large size and small capacity can not be met, which can not meet the control of a car's weight, the consumption of driving force, or even the service life of more than 10,000 kilometers per year. It cannot be used on a large scale in mass production vehicles and is eventually eliminated by auto makers.

Sealed packaged lead-acid battery pack

NiMH batteries

Nickel-metal hydride batteries are in close proximity to our daily life. From the earliest moments it was common to hear small batteries such as rechargeable toothbrushes. Nickel-hydrogen compounds are the positive electrodes, and metal hydrides are the negative electrodes. The energy density and the number of charge and discharge times are comparable. The lead-acid battery has a small increase, and the electrolyte is non-flammable, safe and secure. The manufacturing process is mature. BYD is the world's second-largest manufacturer of nickel-metal hydride batteries before it was built.

Ni-MH battery pack

However, nickel-metal hydride batteries are generally used for auxiliary engine work due to their general charging efficiency, charging and memory effect, and low operating voltage (high pressure and fast charging cannot be used). The best thing to do in this regard is Toyota. The hybrid system uses Atkinson engine + NiMH battery pack. The Atkinson engine itself has the advantage of efficient intermediate speed range, but it also has the problem of low speed and high speed. However, Ni-MH battery can solve the problem of start-up and high-speed power.

Lithium batteries are widely used in the automotive industry after they have been widely cited. For example, Toyota's new hybrid system uses a more efficient combination of engine and lithium batteries. Compared with lithium batteries, nickel-metal hydride battery capacity, cycle charging life and environmental protection point of view are not dominant, the cost advantage is also under the vigorous development of lithium batteries are weakened, this is the reason Ni-MH battery gradually withdraw from the automotive industry Where

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