What is the energy density of lithium battery in China?

Recently, the Ministry of Finance, the Ministry of Industry and Information Technology, the Ministry of Science and Technology, and the National Development and Reform Commission jointly issued the “Notice on Adjusting and Improving the Financial Subsidy Policy for the Promotion and Application of New Energy Vehicles”. The new subsidies have increased thresholds of the energy density of the power battery system for non-fast-charged pure electric buses and special vehicles, speeding up the elimination of low energy density batteries. Speaking of this, what is the battery energy density?

Energy density refers to the amount of energy stored in a given space or mass of matter. The energy density of a battery is also the amount of energy released by the average unit volume or mass of the battery. Battery energy density = battery capacity & times; discharge platform / battery thickness / battery width / battery length, the basic unit is WH / kg (WH / kg).

The greater the energy density of the battery, the more electricity is stored per unit volume.

Energy density of battery, now we all know that it is the battery industry, even the electric car industry to stride forward the most obvious breach, but break it, really is very difficult!

It is understood that the battery energy density of basic decided by is the cathode of the battery, but only is the cathode active material there is no guarantee that the battery can hair electricity, have to have a lot of the active substances, such as conductive agent, reactive powder binder, isolation between film and anode foil, insulation fixed tape, aluminum-plastic film shell steel or aluminum shell and so on.

Most of us always have intention to not intentional of ignore the content of this part of the material, it is concluded that the energy density of large difference with the fact, misleading to eat the melon crowd. Actually, this part is quite important, for the past more than 10 years of technical progress, the battery energy density increase is mainly implemented by active substances of ascension.

Also is to increase the size of original battery power capacity to achieve the effect.

We are the most familiar example is: the first use Panasonic battery 18650Well-known electric enterprise Tesla will change the new 21700 batteries. Have any quality problem and the reason is not 18650 batteries, is only 18650 battery capacity is small, generally around 2-4 ah, the number of series and parallel connections is too large, and the risk of single cell failure is high, its application in the field of electric vehicles is limited by certain.

The lithium battery electric enterprises in our country the energy density is what level?

21700 battery in size than 18650 battery (18 mm in diameter, length of 65 mm), reached 21 mm diameter, length is 70 mm. If you want to again a little bit image to consider this problem, we take a look at from Hitech Energy calculation, only consider monomer dense accumulation is calculated, known: 30 21700 volume is 1.1 times the size of 40 18650, 0.97 times the mass.

Under the same energy, can decrease the number of batteries required about one-third, the decrease in the number of battery pack internal metal fittings, so as to further reduce the battery pack, the weight of the vehicle energy density will be part of ascension, to nearly 300kw/kg.

The following are three particularly notable:

1. By 2020,Lithium ion power battery Monomer ratio, energy is greater than 300wh/kg; System specific energy for 260wh/kg; Cost less than $1 per watt hour; Using the environment up to - 30 ℃ to 55 ℃,with 3C charging capability.

2. By 2025, the monomer specific energy reaches 500Wh/kg.

3. Strive to realize the industrialization and complete vehicle application of lithium ion battery products with a single cell of 350Wh/kg and a system of 260Wh/kg.

Our country the lithium battery energy density of electric enterprises reached what level?

Ningde era: currently, Ningde era in the development of the energy density of 190wh/kg, and 15 minutes with fast charged battery and is expected to mass production this year. In addition, in the era of Ningde planning done before 2020, 300-350wh/kg of the battery energy density, and the cost reduced to less than $1 per watt, new energy vehicles to compete and traditional fuel cars.

BYD: At present, the monomer energy density of BYD lithium iron phosphate battery is 150Wh, and then BYD plans to increase the energy density to 160Wh. In addition to lithium iron phosphate batteries, BYD is also developing ternary lithium batteries simultaneously. If the technology of ternary lithium batteries is combined with lithium iron phosphate batteries, some adjustments will be made to the original use of graphite as a negative electrode material, so around 2020. BYD plans to increase the monomer energy density of lithium iron phosphate batteries to 200Wh.

In addition, in the follow-up ternary battery, BYD's ternary battery has been in mass production conditions, and the current energy density has reached 200Wh/kg. The goal of BYD's ternary battery is to achieve 240Wh/kg of battery energy in 2018 and 300Wh/kg in 2020.

Walter: The 32650 cylindrical lithium iron phosphate battery produced has a monomer energy density of 145Wh/kg. The next step is to achieve 160Wh/kg. The current energy density of the ternary battery is 200Wh/kg, which is expected to reach 300Wh/kg level in 2020.

Guoxuan Hi-Tech: The website of the Ministry of Science and Technology reported on May 19, 2017 that under the support of the key special projects of the national key R&D plan “New Energy Vehicles”, the project led by Hefei Guoxuan Hi-Tech Power Energy Co., Ltd. was “high specific energy power”. The development and integration of lithium-ion batteries has progressed in stages, and battery cell samples with energy densities of 281Wh/kg and 302Wh/kg have been developed.

BAK: In terms of energy density improvement, BAK Power has been developing ternary batteries since 2007. The cathode material system has been developed through NCM111 and NCM532 to NCM811 and NCA. In terms of anode materials, artificial graphite has reached the energy density ceiling. Most concentrated on the development of silicon-based materials.

Tianjin Lishen: on April 13, ministry of science and technology web site message, led by Tianjin Lishen battery joint-stock co., LTD., to undertake the project of "development and industrialization of high energy density lithium ion power battery technology" developed the energy density of 260wh/kg power battery monomer, compared with the commonly used power battery electric vehicle energy density increased by 30%.

The project team has carried out in-depth research and technical breakthroughs in improving the weight ratio energy density of power batteries and substantially improving the cycle life, including the development of new high-nickel cathode materials, silicon-carbon composite anode materials and new electrolytes; the cell capacity of 260Wh/kg has a capacity retention rate of 83.28% after 350 charge and discharge cycles. At the same time, power battery samples with energy density of 280Wh/kg and 300Wh/kg have been developed.

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