Why call a halt to ternary batteries

"Why call a halt to ternary batteries? Lithium iron phosphate bus still on fire, is it also to stop? Still have fuel oil car, the case that catch fire after fuel leakage is not little also, also want to stop together?"

On September 7, the public account of "electric vehicle association" WeChat published an article titled "frequent spontaneous combustion accidents of electric vehicles, academicians call for the suspension of three-yuan battery", which caused an uproar in the industry.

Yang yusheng, an academician of the Chinese academy of engineering, took a strong stand in the article, calling for an end to "artificial ternary batteries" with poor safety and stability, and for the development of lithium iron phosphate. He believes that for electric vehicles, both commercial and passenger vehicles, human lives are at stake and safety must come first, with other issues making way.

A stone aroused a thousand waves, Yang yusheng academician "stop the issue" issued, the question came flooding in.

Although a small number of people supported academician Yang and believed that the safety of ternary battery was low and should be stopped and relatively safe lithium iron phosphate battery should be encouraged, most people still thought that academician Yang's view was too one-sided.

Which side of the argument stands up?

To figure out which battery is better suited for electric cars, we should first have a simple understanding of the difference between the two.

The so-called lithium iron phosphate battery refers to the lithium ion battery with lithium iron phosphate as the positive electrode material. This type of battery is characterized by the absence of precious metals (such as cobalt). Without precious metals, the raw material cost of a lithium iron phosphate battery can be compressed very cheaply. In practical use, lithium iron phosphate battery has the advantages of high temperature resistance, strong safety and stability, low price and better cycle performance, but the disadvantage is low capacity density, and it is difficult to improve.

The ternary lithium battery is a lithium battery which USES lithium nickel-cobalt manganate as the positive electrode material and graphite as the negative electrode material. Unlike the lithium iron phosphate, the ternary lithium battery has a high voltage platform, which means that at the same volume or weight, the ternary lithium battery has more specific energy and more specific power. In addition, ternary lithium battery also has great advantages in terms of high rate charging, low temperature resistance and other aspects, but also has distinct disadvantages, namely, relatively low safety.

So do we want more safety or better performance?

Should ternary battery be stopped as academician Yang said?

Listen to the industry.

Why push iron lithium to want to kill 3 yuan?

Li, the technical vice President of an electric vehicle company, on:

Academician Yang recommended lithium iron phosphate battery is right, recommended carbon lead battery is also right, but why push iron lithium to kill three yuan?

It has been a long time since anything can be said to be harmful to the development of an industry.

Three yuan this is not guilty, by policy push up "train" should behead? In order to recommend one technical route, kill the others?

Please respect the technology

Liuzhou wuling automobile co. LTD

Chief of electronic power systems

Yang's view is a bit biased. Current lithium-ion batteries are at risk of catching fire, and recent incidents of spontaneous combustion in electric vehicles show this. Why burn cars so often? Did not make clear before, put forward the limit three point of view, not objective, will kill three batteries.

There are many links in the whole process of the battery system, which can be improved. The safety of the battery system is designed and cannot be solved by relying on the material system alone. Practitioners of new energy vehicles should be more in awe of technology, less short-sighted ideas, refuse to fabricate, and pay attention to objective laws.

The influence of academician is very great. We hope academician Yang can make an objective investigation to help the healthy development of the industry, rather than hinder it.

Setting aside the system to talk about the safety of the battery system is a rogue

Learn more from the electric guild readers:

When it comes to the safety of ternary batteries, there is no denying that those who do this know that ternary batteries are not safe and less safe than lithium iron.

But are iron-lithium batteries safe enough? Throw away the system to talk about the safety of battery system, this is naked play hooligan. Put aside the protection of gasoline, gasoline is more unsafe.

All energy storage devices are the same, the higher the energy, the less safe. Under such technical conditions, battery manufacturers and car companies have to do is how to prevent accidental release of energy. Under the vigorous advocacy of the state, power battery technology has made great progress in recent years. Without the rapid development in recent years, which enterprises invest in the research of product safety? Of course, there is no so-called master to point out. Because not to research, the results of more and more information disclosure, we all pay attention to, a few people really understand the safety of batteries.

The problem is not to escape, but to overcome. Stop three yuan, there is no real power to understand the three yuan battery, the future is a disaster. No provocation, the masters should study more, less platform.

The ternary battery has not passed the puncture safety test so far

"Electric association" readers:

Ternary lithium battery is not suitable for electric vehicles at present. The combination of tesla and panasonic is the beginning of a wrong design. Unfortunately, so far, lithium ternary or failed to pass the puncture and gravity impact of two items of safety testing certification.

Member of my personal response to the appeal, should reconsider suspended three yuan in the application of electric vehicles, lithium as Toyota motor controlled by panasonic battery, Toyota herself are reluctant to use up to now, the industry should be called for panasonic battery out of Japanese companies has always been the spirit of social responsibility, take the lead to evaluate the safety of the lithium ternary batteries, lithium until three yuan as motive power sources of electric vehicles can be safe, again into the market.

Cost reduction is the root cause of frequent safety accidents

Battery industry practitioner song zhen:

As a former battery industry practitioners, witnessed the current domestic battery industry of all kinds of chaos, I have to spit it out.

Actually although ternary lithium battery itself from the system security is the lithium iron phosphate is a bit poor, but enough to meet performance requirements of automotive safety, is really terrible in the terminal and makers require their battery price, under the pressure of the battery manufacturer to remain a shocking high profits, by all means to reduce costs, random change of plus or minus grade powder.

As is known to all, for the vehicle, any security components involved, once produced materials, design or process changes that are likely to cause potential safety hazard, so oems for this type of change control is very strict, but the real problem is that the battery manufacturer for cost reduction or meet the same capacity to supply demand, a lot of change in the powder on the battery module level are not well is a large amount of the supply of argument, not to mention oems in battery pack level and the vehicle level after validation (a major domestic oems are mostly do the battery package).

For battery this parts don't like metal parts and electronic components, raw materials caused by the change of the electrochemical reaction of complex things are very difficult to control, if the change battery factories, oems in the early stage of the basic no may find that risk in this way, step by step be amplified, some so-called battery manufacturer to the practice of national pride, is not contribute to overtake another car on a curve for China's auto industry, but in order to short-term profits, in slowly destroy the industry, indifferent to the life of the people.

We will increase annual inspection standards for electric vehicles

Song yanming, chief designer of beizhong group product research institute:

Both ternary batteries and iron-lithium batteries have fire cases, but in different proportions. Lithium iron phosphate, nickel cobalt manganese three yuan 333 523 (622) 811 also have their advantages and disadvantages, high energy, safety and cost need a joint point. Ternary batteries increase the risk of using simply to reduce the proportion of cobalt.

The way to avoid fire accidents is to increase the safety inspection of electric vehicles, to make unqualified products exit as soon as possible, to make unscrupulous enterprises unable to survive, to increase the annual inspection norms and standards of electric vehicles, so that consumers can rest assured.

In my opinion, technology is not good or bad, but suitable for different products or environments. There is no such thing as a better or worse battery. It just applies to the actual use scenarios. If the safety and stability of ternary lithium battery are made stronger through technical means, compared with lithium iron phosphate battery, it is indeed more suitable for current and future household electric vehicles.

However, it is worth mentioning that due to the dual stimulation of high cobalt price and domestic subsidy policy, various automobile enterprises and battery manufacturers are scrambling for the road of high nickel. However, in fact, a series of problems in the mass production process still need to be solved before high nickel ternary power batteries can be truly applied in automobiles. Without a certain technical reserve and strength, it is difficult to promote the industrialization of this battery, which helps to improve energy density and reduce cost, without guaranteeing safety and stability.

The page contains the contents of the machine translation.