About cell energy density level

Today, I saw the report of Dr. Wang’s speech. The article is “China Automobile Research Wang Fang: The single target energy battery power density of 300Wh/kg can be achieved, but the comprehensive indicator needs to be overcome”, she is also very cautious in the group. “I didn’t say that the goal has been achieved. It means that we can work hard to achieve. In addition, among the tested products, the single indicator of a major special research and development product of the Ministry of Science and Technology is currently available, but as a loading product, the realization of comprehensive indicators is also There are many needs to overcome

From a whole point of view, the level of energy density of the battery is critical. Now everyone knows this level. Coupled with the group rate, the energy density of the system can be directly estimated. According to the current rate of increase, the future subsidy will be 1.0. Coefficient, how long can 140Wh/kg really do not know.

Note: The time from 120Wh/kg to 140Wh/kg is fast, the next 140Wh/kg can persist for how long to see exactly how many cars can occupy this number. As Mo Kexiong discussed in his three articles “From the New Deal and the Data to the Development of Electric Vehicles in 2018,” the subsidies are logical to follow.

The New Deal embodies the willingness of the competent authorities to intensify efforts to boost the energy density of batteries. We know that the energy density and safety of batteries are a contradiction. The higher the energy density, the more attention should be paid to safety.

The link between battery energy density and subsidies started last year. Last year's subsidy policy was that a subsidy coefficient of 1.1 times could be obtained for a battery pack of 120Wh/kg or more. After six months of preparation, the company began mass production of pure electric passenger car products with battery packs of 120Wh/kg or more, and the volume has rapidly increased. In the four months after September, more than 120Wh/kg of battery packaging capacity The proportion is stable at more than 40%, and the pace of development is surprising. This speed is beyond the scope of normal understanding, but also makes people feel a bit worried about whether the safety factor of vehicles and battery packs can be maintained.

I would like to sort out the information I know. I'll probably sort out the existing energy density of the battery cells, mainly to expand Dr. Wang's picture. The ternary lithium battery has a higher energy density. From 136Wh/kg to 230Wh/kg, with an average of 183Wh/kg

1) Square shell

The energy density of the square-shell batteries is a disadvantage. It is about 210Wh/kg. This year, we have a little bit of a difference between the PHEV2 and 50Ah platforms. Understand that the CATL is mainly based on 523. This level of 622 to be improved can be equivalent to 205Wh/kg +/-10, that is, 50Ah+/-2Ah level

2) Cylindrical

Each column is based on the 18650, battery cell energy density between 210-260Wh/kg, all using three yuan battery. The application of cylindrical batteries in 2017 is mainly based on special vehicles, supplemented by passenger vehicles. The main reason is that the energy density is high and the consistency is indeed a lot of considerations.

3) Soft Package

Soft bags are used on passenger cars. The starting point is relatively high. Because they are all classic shapes, they are quite large, and they are well above 210Wh/kg. As far as I know, there will be a big breakthrough in 2018, and several of them are catching up with LG's 622 level of 240 +/- 10 Wh/kg.

Summary: From the standpoint of monomers, it is more desirable to make breakthroughs in the energy density of soft packs, but simply emphasizing the energy density of the monomers is sometimes strange. But sometimes there is no way. The competent department said that we should go in one direction first. As for who could not lose the chain in the fast-rising threshold, this would be a matter of course.

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