What is the reason why the entry level pure electric vehicle adheres to the use of a three-dimensional ion battery?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

In the early stage of the pure electric vehicle market, lithium iron phosphate ion batteries are mainstream batteries. However, with the development of the power lithium-ion battery, the three-dimensional ion battery gradually substituted a lithium iron ion battery. It is necessary for the lithium iron phosphate ion battery compared to the ternary lithium ion battery, the energy density is low.

In the early dynamic lithium-ion battery, the energy density of the lithium iron phosphate ion battery pack is only 100Wh / kg, and the energy density of the ternary lithium ion battery pack can reach 140Wh / kg or more. With the resurrection of the minimal electric car subsidy, plus the high price of pure electric vehicles, the gap is obvious than traditional fuel models. The low energy density is low, and the lithium iron phosphate ion battery short in the battery life is not advantageous.

In addition, the anti-low temperature performance of the lithium iron phosphate ion battery and charging performance is comparable than that of the ternary lithium ion battery. Under winter cold conditions, the attenuation of lithium iron ion batteries will reach more than 50%, coupled with slower charging performance, which will greatly reduce pass efficiency. Therefore, the energy density is better, and the three-yuan lithium-ion battery stronger is gradually sought after by the vehicle enterprise.

With the development of the market, there are more and more models of NEDC's battery life more than 600km. However, the three-dimensional lithium-ion battery is not disadvantageous. Although there is an advantage in energy density and charging performance, it is lower than the lithium iron phosphate ion battery on the battery cycle life and battery cycle life.

The ternary lithium-ion battery is tightly used by the positive electrode, a ternary positive material of lithium nickel-watery oxynumide or a nickel-cobalt-aluminate, is desirable to be based on nickel salt, cobalt salt, and manganese salts. The cobalt element in these two positive electrode materials belongs to precious metals. According to the data of the relevant website, domestic cobalt metal reference prices are 277,500 yuan / ton, and with the reduction of materials, the price is still growing.

At present, the cost of the three-dimensional lithium-ion battery is 0.85-1 yuan / WH; the cost of the lithium iron phosphate ion battery without noble metal elements is only 0.58-0.

6 yuan / WH. In addition, the cycle life of the three-dimensional lithium ion battery is also like a lithium iron-ion battery, and the amount of charge and discharge of the phosphate ion battery is 2,000 times. Generally in use 4 years, most of the battery performance will attenuate, which also leads to a high battery replacement cost.

On the battery safety, the thermal acceleration of the three-dimensional ion battery cell cell is low, and it has reached a range of around 200 degrees, and this thermal out of control will be safe. The lower the lower. With the energy density of ternary lithium-ion battery, the safety hazards brief.

In fact, we can often see pure electric vehicles spontaneous news. Therefore, battery safety is also a major illness in electric automotive models. Why do you have to use a three-dimensional lithium-ion battery? The front parsed the advantages and disadvantages of the lithium iron phosphate ion battery and the three-dimensional ion battery.

Some people may ask. Since the safety of the lithium iron phosphate ion battery is so good, the battery's cycle life is still long, and the cost is still low, then Why do many manufacturers still insist on their entry level pure electric vehicles to carry a ternary lithium-ion battery? Really, the lithium iron phosphate ion battery equipped on the entry level pure electric car is really a more ideal idea. However, the current energy density of lithium iron phosphate ion battery is low, and the NEDC endless mileage of the models of the models of this type of battery is basically around 200km, and there is no national subsidy.

If the battery pack is to be reached, the number of battery packs is to be added, which also leads to the new growth of the vehicle. And the general entry-level model size is not large, so so many battery packs cannot be placed. Therefore, the current phosphate ion battery is generally selected by the electric bus, electric light card and other means of transport, and they have more space for the battery, and because of the fixed route, they don't have to consider the battery life.

In terms of safety in the battery, people don't have to worry too much. At present, the high pressure system of the three-dimensional lithium-ion battery and the high-pressure parts are basically reached the highest level of IP67 waterproof and dustproof civilians, even in the 1 meter deep water soaked for 30 minutes battery without damage. Moreover, when the battery is short, high-voltage overload, and collision, the system will automatically disconnect the high voltage power supply, and the risk of self-ignition.

Moreover, the high charging performance of the three-dimensional lithium ion battery can support the charging of the large rate, further enhance charging efficiency, and the experience will be better. In addition, in order to improve the competitiveness, many car companies have launched a power-saving and repurchase policy to reduce the problem of battery costs.

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