Can the energy density of the power lithium-ion battery really determine the quality of electric cars?

作者：Iflowpower – Kaasaskantava elektrijaama tarnija

A friend considers buying an electric car (no way, persuading it is not listening), in the process of accompanying the car, the author found that the salesperson began to use the energy density of the battery as an advocacy. "This car energy density is as high as XXX", "battery brand is XXX" speech, usually speak from the sales consultant of the electric car. When I asked, when I was energy density, the sales consultant did a few seconds, and said: "Simply, the energy density is higher, the better the car, the country has more subsidies!" It is very clear, energy Density this, even some car sales consultants are not too clear.

In fact, some new products and new technologies are promoted, and there is almost in all industries. But what these new stations use to do? How much value is there? After the consumers are wrapped around the cloud, it seems that it is not very concerned about these problems. I only feel that this thing is really a cow.

Niaj hnub no peb tham txog lub zog ceev ntawm lub roj teeb, ntau npaum li cas cuam tshuam rau qhov zoo ntawm lub tsheb fais fab. Is the energy density? First of all, we simply understand the battery energy density is something. Lub zog ceev tau muab faib ua ob, qhov hnyav zog ceev thiab ntim zog ceev.

The current reference is the weight energy density, which calculates the formula: weight energy density = battery capacity ¡Á discharge platform / weight, unit is WH / kg (Watt / Kik); and the volume of energy density calculation is required to change the "weight" of the above formula to "volume", the unit is WH / L (watt / liter). Hauv kev yooj yim, lub zog ceev yog qhov ntsuas ntawm lub roj teeb lub zog cia lub peev xwm. And such evaluation, it was not to determine the standard of good or bad electric vehicles, but the policy requirements for the company's power lithium-ion battery power storage capacity.

According to the requirements, the company needs more than 300 watts / kg in the 2020 lithium-ion battery monomer, and the system is more than 260 watts / kg. Los ntawm qhov kev xav ntawm kev lag luam, vim qhov no yog tus qauv ntawm txoj cai tsim, nws yog qhov txaus nyiam rau cov neeg siv khoom, yog li nws tau dhau los ua plummer hauv cov txheej txheem muag khoom ntawm cov tsheb fais fab. The evaluation of energy density is not fully mature, and the evaluation of energy density is not absolute fair, because this and car companies are straight.

Peb tau hais ua ntej, thiab txoj cai yuav xav tau lub zog ceev, thiab lub zog yog ib qho ntawm cov qauv siv nyob rau hauv cov nqe lus ntawm kev txhawb zog tshiab. Qhov siab dua lub zog ceev, qhov nyiaj pab tshiab zog ntau dua. This has led to a "arms race" in the power lithium-ion battery, and there are still many cats.

To understand how the car enterprise improves energy density, it has to say from the formula just now: weight energy density = battery capacity ¡Á discharge platform / weight. To increase this formula, the final value is two, one is to increase the battery capacity, and the other is to reduce the weight of the battery. Yuav ua li cas kom muaj roj teeb muaj peev xwm yog kev coj ua lub siab.

There are many kinds of large-scale capacity, and the most is from the battery material. At present, the three-dimensional lithium-ion battery is the highest power lithium-ion battery type in China, while the phosphate iron battery is very fast. Txawm li cas los xij, kev coj ua ntawm lub siab tsis muaj qhov zoo ntawm cov neeg tsis noj qab haus huv txhais tes, txhawm rau ua kom lub roj teeb muaj peev xwm, qee cov tuam ntxhab tau txo qis cov kev xav tau ntawm cov roj teeb ruaj khov, thiab kev nyab xeeb kev nyab xeeb tau nce.

Yog li ntawd, muaj kev lag luam sab hauv, thiab hauv cov roj teeb muaj peev xwm zoo heev, peb yuav cuam tshuam rau kev nyab xeeb ntawm cov tsheb hluav taws xob. Another way is to mitigate the overall weight of the entire dynamic lithium-ion battery, which is actually not cured. Some high-quality power lithium-ion batteries have a separate cell in each battery pack to fail to fail to affect the entire battery pack.

To reduce the weight of the dynamic lithium-ion battery, it is the first to rush to these cells. Either develop a new material allows it to reduce weight without affecting the protection of the battery, or a material that is straight down on the material or lighter but poor intensity. Yog li ntawd, muaj ntau txoj hauv kev los ntxiv zog ceev.

Relevant car companies, cutting materials is a "win-win" approach, and security issues are of course 60 tons. In the case where there is no uniform requirement for the structure and material of the battery, the safety and quality of high energy density is in qualifying, good or excellent level, and consumers are unparalleled. Write in the last actual, the simplest and rude approach, or the total capacity of the battery.

If you want to consider the factors of battery safety, the quality of the vehicle, the electric car is still a penny, which is still a penny. Hais ncaj nraim, feem ntau, lossis tus nqi ntawm lub tsheb txiav txim siab zoo. If the relevant part can improve the fairness of the electric vehicle assessment standards, it is very positive for the progress of stimulating technology and the protection of consumer right.