Which new energy vehicle is more suitable, nickel-metal battery or lithium battery?

The industry has gone through the lead-acid battery and nickel-cadmium battery era, and is now in the green battery era of Nickel-metal battery and lithium ion battery. Which is better, nickel-metal battery or lithium battery?

On June 25, 2009, the ministry of industry and information technology issued "new energy vehicle manufacturers and product access management rules," the rules on July 1, the official implementation. In the rules, new energy vehicles are divided into three stages: start-up, development and maturity. Fuel cell vehicles, hydrogen engine vehicles and dime thy ether vehicles were included in the start-up period; Hybrid passenger vehicles, commercial vehicles and pure electric vehicles powered by lithium ion power batteries are in the development stage. Hybrid passenger cars with lead-acid batteries and nickel-metal  batteries are mature. It is worth noting that the lithium battery electric car, which was widely favored by the industry, fell behind the nickel-metal  battery hybrid, which was defined in the development period.

Nickel-metal batteries accelerate

As an alternative to the earlier nickel-cadmium batteries, Nickel-metal batteries are the most environmentally-friendly batteries at present. The toxic cadmium will not be used again, which can eliminate the environmental pollution caused by heavy metal elements. Nickel-metal batteries have a large energy density ratio, which means that the use of nickel-metal batteries can effectively extend the working time of the equipment without adding extra weight to the digital equipment. Another advantage of nickel-metal  batteries is that it greatly reduces the "memory effect" existing in nickel-metal batteries, which makes nickel-metal  batteries more convenient to use.

Why nickel-metal battery replaced the lithium battery which is most valued by people? It makes sense. First, nickel-metal batteries have been on the market since the 1990s and have been tested by the market for a longer period. Secondly, nickel-metal mineral resources are abundant. In addition, there are many domestic manufacturers, including more than 100 private enterprises in Guangzhou province. Fourth, compared with lithium, nickel - hydrogen batteries are characterized by high safety, not easy to explode.

Nickel-metal battery is the most mature secondary battery in the field of HEV. However, from an objective point of view, nickel-metal battery also has some "constraints" : the refining technology is not mature, the cost is too high. There is also a big hidden danger is once a large area of promotion, the future will face the problem of recycling. In the long run, nickel-metal battery will face the strong challenge of lithium ion battery, but in the short run, nickel-metal battery is still promising in the coming new energy era.

Lithium battery future star

Since its commercialization in 1991, the whole lithium ion battery industry has developed rapidly. Among them, polymer lithium ion battery is superior to liquid lithium ion battery in safety, volume, mass, capacity and discharge performance, with a wider range of applications.

At the 5th Beijing international exhibition of electric cars and clean energy vehicles held recently, the reporters found that almost all the pure electric buses and coaches that the bus manufacturers brought to the exhibition used lithium batteries. First automobile passenger car USES lithium power battery, in da qingshan pure electric passenger car, Shandong yixing USES lithium iron phosphate battery, also has including lithium ion phosphate group electron, lithium ion phosphate group and many kinds of lithium batteries have been fully demonstrated.

Song jian, executive vice President of automotive engineering research institute of tsinghua university, said that at present, 99% of the global market share of hybrid battery is nickel metal  battery, and the development of nickel metal battery technology in China is relatively mature. However, the price of nickel is very high, and the production cost of nickel-metal battery is much higher than that of lithium battery. Compared with nickel-metal  batteries, the new generation of lithium batteries will reduce the weight by half, the storage capacity will be more than doubled, the range will be greatly improved after a charge. And the life of nickel-meta batteries will reach its limit in the next three to five years. In the long run, lithium battery will become a more reliable power source for the development of new energy vehicles in the future.

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