Why does BYD insist on lithium iron phosphate batteries?

Lithium iron phosphate batteries is completely independent research and development of the domestic lithium battery of BYD with huge investment, which already belongs to mature product, and is also widely used in domestic; Although compared with lithium battery products abroad, the characteristics of lithium iron phosphate battery is not perfect. It breaks the foreign technology monopoly, and makes our own route of lithium battery research and development, so we admire the spirit very much. BYD lithium iron phosphate battery will not explode. Let's find out the key factor and the backing in the development of China new energy vehicles. According to the reality of our industry, compare the present situation and the development direction of ternary and lithium iron phosphate battery.

Comparing the advantages and disadvantages of three yuan and lithium iron phosphate batteries:

1, if continue to develop three yuan, us power lithium battery will always be in a state of chasing, not only not achieve the corner overtaking, but also will lose the security of new energy vehicles.

At present, the modification and the core technology of ternary lithium manganese acid lithium, both in Japan and South Korea enterprise hands. Especially the ternary lithium, technologies, processes and equipment, Japan and South Korea industry leading has reached a very mature and stable stage. If the development direction of China's new energy automobile power battery orientation in development of ternary lithium electricity, not only in pursuit of Japan and South Korea enterprise for a long time, but due to lack of key technologies, processes and equipment, has developed into a bottleneck. Serious subject to Japan and South Korea enterprise technology, scale also is much less than the Japanese and Korean corporate giants. Samsung SDI this year will be 18650-2.2 - AH battery sales price dropped to $1 / only, almost to push domestic peers on the wall.

In the domestic three yuan power battery performance and price can't compare in giants, China and South Korea, if we stick to three yuan on the new energy vehicle power battery line, I'm afraid we still chasing the road, has been the international giant to kill, more don't talk about what corner overtaking. The end result will be like a conventional car development, high-end car and core technology is derived from the international giant, even if we give up the market also change not to return the core technology.

Lithium iron phosphate batteries are different. Japan and South Korea enterprise basic not involved, the international main competitors from the United States. Although two basic patent in the United States has a (A123 and Valence is the main representative) of the lithium iron phosphate batteries, but the difference between the technology level of China and the United States, and China is the world's largest investment in the field of lithium iron phosphate and the country with the largest production volume.

As universal group acquired A123, in fact, Chinese companies have mastered the lithium iron phosphate battery technique and technology to the world highest. The lithium iron phosphate batteries in dueling cycle life and safety of ternary lithium electricity, it is China's new energy automobile key elements and development needs. As long as the clear its developing status, increasing investment curing this advantage, China's new energy vehicles will be the possibility of overtaking corners.

2, choose three yuan, top-level design lack of forward-looking, global nickel and cobalt resources nervous, its vast application will lead to market prices, particularly China, the two elements still cannot be supported.

Ternary lithium electricity materials formula, whether nickel cobalt manganese acid lithium, lithium nickel or cobalt aluminate, cannot leave the two precious metals, cobalt and nickel. Both metals are very scarce in China, the global reserves is limited. Among them, the cobalt in China need to import the use of more than 90%, nickel is mainly used for stainless steel production, the two precious metals have international futures trading, prices are not only high and volatile.

If China is to determine the ternary lithium electricity as the main line power battery development, in accordance with the government plan, by 2020, the production capacity of 2 million cars in new energy, new energy car ownership by 5 million. Per new energy car power battery charge on an average of 80 KWH, 5 million needed for new energy car battery 400 billion WH batteries, that doesn't include for replacement and spare batteries. Once the demand to the market, will soon push cobalt, nickel futures prices, thus promote the spot market prices, the ternary lithium electricity future prices will increase. China new energy cars didn't achieve the goal of policy is expected to one big reason, is the high prices. Among them, the most important reason, is occupying the new energy car costs nearly 50% of the high power lithium battery prices.The results of three yuan route, is the new energy car prices higher, requires the government's subsidies also want more, never come to market promotion.

The opposite of lithium iron phosphate battery, do not contain any precious metals, and the main material in the manufacture of the cathode material iron oxide, lithium carbonate reserves are abundant in China.If new energy automobile market demand amplification, downstream of the upstream materials under the impetus of the scale effect, cost will plummet, occupy the lithium iron phosphate battery costs more than 30% of the anode material price decline, will cause the lithium iron phosphate battery prices fell rapidly.

3, vehicle safety design, China's new energy vehicles use ternary lithium electricity as the power battery, there is great potential safety hazard.

Tesla caught fire three times, including one for the sheet metal through the battery, but Intel tesla vehicle safety design perfect, three fire did not cause casualties. Ternary material of temperature is 200 ℃, exothermic energy more than 800 j/g, ternary lithium electricity can't through the needle thorn experiment, shows that the three yuan in the case of internal short circuit batteries, it is easy to cause safety accidents.

At present, China's new energy vehicle safety design, tesla levels cannot be achieved in the short term, using the ternary lithium electricity as motive power sources of new energy vehicles there is a huge security risk. Life safety is a matter of passengers, the safe hidden trouble even one over one hundred thousand probability, is also not acceptable. Lithium iron phosphate batteries at high temperature stability, can reach more than 390 ℃, guarantees the high security, the battery will not due to overcharge, high temperature, short circuit, the impact produced by explosion or burning, can easily through the needle thorn experiment. The security features of China are still in the immature stage of the new energy automotive industry, is the most appropriate.

4, from China's new energy automobile use object consumption characteristics and habits, the ternary lithium electricity power battery is not suitable for China's new energy car.

Tesla was known as the "toy" of the rich, assembling battery capacity design range of 400 km, but most of the time, the actual operation is about 200 km, is a pale imitation, thus guaranteeing cycling life. But most of China's new energy vehicles used for bus, government official, vehicle and the passenger vehicle, its use characteristic is that most of fixed-line and frequency requirements, each day is a deep filling, ternary lithium electricity under the condition of DOD95 % above, capacity attenuation speed, cycle life is only less than half of the lithium iron phosphate batteries. New energy vehicles using 8 years on average, power lithium battery if put in a deep filling conditions, maintain more than 80% of the capacity, the service life of the ternary lithium electricity will be less than three years, and lithium iron phosphate battery basic can satisfy the use requirement of eight years.

Under the condition of the relevant national subsidy policy, for the first time to buy new energy vehicles have a corresponding government subsidies, but the second purchase battery was no subsidies. The ternary lithium battery in new energy vehicles use cycle, need to replace two batteries, will greatly increase the economic burden of users, and won't be accepted by end users. If the ternary lithium electricity to get the same service life as the lithium iron phosphate, its only a pale imitation, needs to increase at least 50% or more of the battery capacity. So, the advantage of its high energy density will be lost, the volume will be bigger than with the performance of lithium iron phosphate batteries, battery weight will be heavier, its price is much higher than the lithium iron phosphate batteries.

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