Deep Libyadi new E6 battery technology

Deep Libyadi new E6 battery technology

In terms of performance, the new E6 is used along the old phosphate ion battery technology route. The battery capacity increases from 82kWH to 91KWH, so it effectively guarantees the E6 pure battery life mileage to 450km..

This is definitely a super-satisfied number.. However, from the perspective of unit power consumption, E6 obviously reflects the essence of “relying on the stacking battery to enhance the mileage”, and the average level of 4.

9 km per degree is far behind other competitors, even if it is not small and pure electric knowledge. D2 ratio, with the compact emot, the TSLA of Beiqi EU260 or even “obviously stacked battery” is also in the wind. The core reason that caused this phenomenon is that other competitors use a three-dimensional lithium-ion battery, and BYD uses a lithium iron ion battery, usually, the ternary lithium ion battery has a higher energy density, and iron phosphate Lithium energy density is generally low.

Why is the energy density of lithium iron phosphate? This is to start from the battery structure.. Usually the whole vehicle is integrated into battery systems (including battery packs and BMS control systems), and battery systems can be broken down into pack, monomers, battery materials.

. About a battery monomer, it is important to consist of positive electrode, negative electrode, electrolyte, diaphragm and other materials. The four materials have their respective divisions, when discharge, lithium ions and electrons are removed from the negative electrode, and the electrons reach the positive electrode via the external circuit, and the lithium ions enter the positive electrode through the electrolyte, lithium ions, positive materials, and electrons in the positive electrode.

Combine to complete current conveys. The use of the diaphragm is separated by positive and negative to prevent short circuits..

Therefore, the size of the battery discharge is determined by the positive and negative electrode, that is, to accommodate more active materials including lithium ions.. Since the pampf material is generally used to make a negative electrode, the capacity exceeds 350 mAh / g, and the positive material is usually composed of lithium cobalt organte, lithium iron phosphate, nickel-cobalt manganese (ie, three yuan lithium), usually less than 200mAh / G.

That is, the negative “activity” positive “activity”. Therefore, the energy density of the battery is determined by the positive electrode material..

And the ratio of lithium iron phosphate is lower than the nickel-cobalt-manganese three-dimensional material, which leads to the unit power consumption of BYD E6, behind other competitors.. Then there is another coming: Why is BYD to use lithium iron phosphate? In fact, although lithium iron phosphate is lower than ternary, it has high safety, long life, low cost advantages.

. Safety: The thermal stability of the ternary material is relatively poor, decomposing phenomenon at the external temperature of around 200 degrees, release oxygen, thus fires for battery high temperature. However, lithium iron phosphate will decompose at 700 ¡ã C, even if the decomposition does not release oxygen.

Long life: At present, the three-yuan battery 1C cycle life is about 2500 times, while the lithium phosphate ion battery is about 3,500-5,500 times, so the life is longer and more stable.. Low cost: From the perspective of raw material, the cost of lithium iron phosphate is about 40-50% of the ternary material, so it can significantly control the cost.

. According to 91KWH calculations, the battery system cost of E6 is about 100,000 yuan. If it is a three-yuan material, the cost price will soar to 16-18 million yuan.

. Therefore, in the comprehensive consideration of energy density, safety, cost, BYD E6 selects a lithium phosphate ion battery, which does not use ternary materials, which is a compromise that is incompletely succumbing to performance..

Secondly, BYD’s battery intelligence temperature control system is conscience configuration due to the charge and discharge characteristics of the lithium ion battery, which can cause additional power loss, especially in winter, very low temperature, and battery power under winter. Will shrink sharply. To this end, BYD E6 adds a thermostatic control system on the basis of the old model, which allows the battery to always maintain normal temperature, working at the optimum temperature, so it is effective to prevent accidents such as failure in low temperature environments.

. This is worthy of praise. The above is the core technology of BYD E6 to reach 450km pure battery life.

. But the smart car must tell the reader to pay special attention to the following two points..

First, the charging time of BYD E6 will be longer. Because of a battery pack with up to 91 kWH, it will last for 2 hours when the input voltage 380V three-phase alternating current is used..

And if you use a home 220V power supply, the charging time will be 8-10 hours to full.. Second, the battery pack of this car is installed on the chassis, and there is only 138mm from the ground gap, which is equivalent to a small bottle of mineral water, so do not walk the car, so as for The country road is not mentioned, you have to know your battery pack worth 100,000 yuan.

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