BAK introduces a new power battery that supports a 500-kilometer life of a pure electric passenger car

In this competition to improve the energy density of power batteries, Shenzhen BAK Power Battery Co., Ltd. (hereinafter referred to as BAK Battery) has taken another big step.

On May 16, BAK Battery introduced a mass-produced 18650-3.0Ah battery with an energy density of nearly 250Wh/kg, which can support a 500-kilometer range of pure electric passenger cars.

Bick battery technicians said that if the daily commute distance is 35 kilometers, driving an electric car equipped with this battery, ideally only need to charge twice a month. The anode material of the battery core is made of silicon carbon, and the cathode material is made of high nickel cathode material.

“The 3.0Ah battery can reduce the cost at the system level while increasing the energy density,” said Pan Wang, vice president of BAK Battery. He told reporters that the same battery pack originally required ten 2.7Ah batteries, and now only nine 3Ah batteries are needed, which reduces the material cost of the system level to a certain extent. In addition, the high energy density cell and lightweight structure design help to improve the cruising range of the vehicle.

At present, the annual production capacity of the BAK 3.0Ah high-energy battery is 6.5GWh, and the daily production capacity is 2 million.

As of the end of 2017, the battery capacity of the BAK battery is 8GWh. In 2017, the installed capacity was 1.71GWh, ranking fifth in China's power battery installed list.

Energy density refers to the amount of energy stored in a given space or mass of matter. The energy density of power batteries has become a key indicator for the development of power battery companies.

The new energy subsidy new policy introduced in February this year puts new demands on battery density. The subsidy threshold for energy density of pure electric passenger vehicles is increased from 90Wh/kg to 105Wh/kg, and the threshold for energy density of pure electric passenger cars is raised from 85Wh/kg to 115Wh/kg. According to the plan of "China's Automotive Industry Medium- and Long-Term Development Plan", by 2020, the power cell's specific energy should reach 300Wh/kg, and the system energy density should reach 260Wh/Kg.

"In terms of energy density, BAK batteries are comparable to Japanese and Korean battery companies, but in terms of products, Panasonic and Samsung can now achieve the level of 3.35Ah, and we still have a technical gap of half a year." Hanche Cao, deputy general manager of Zhengzhou BAK Quality Center, said.

According to Wang Pan, BAK Battery is currently the only company in China that can achieve mass production of 250Wh/kg battery. In the second half of the year, it will also introduce 3.35Ah products. By then, the monomer energy density can reach 270wh/kg.

"The energy density of 300Wh/kg is basically difficult to achieve in the 18650 system." Yanbin Li, chief engineer of Becker battery cylindrical technology, said frankly, therefore, BAK battery will seek breakthrough in energy density index on 21700 products. She said that the 21700's products have been completed in the laboratory stage, but it will take some time to mass production.

The 18650 battery has a diameter of 18 mm and a height of 65 mm. The 21700 battery has a diameter of 21 mm and a height of 70 mm. The energy density is about 35% higher than the former.

According to data released by Tesla in 2017, the energy density of the 21700 battery cells produced has reached 300Wh/kg, and the unit cost of the battery system can be reduced by 9%.

Previously, Junqun Zeng, chairman of the Ningde Era, said that the technical level of China's power battery companies has been comparable to that of Japan and South Korea. At the end of 2016, the Ningde Era launched the “New Generation Lithium Ion Power Battery Industrialization Technology Development” project, and plans to increase the specific energy of lithium-ion battery from 150-180Wh/kg to 300Wh/kg by 2020. In addition, the energy density of the ternary power battery of BYD and Waterma also exceeded 200Wh/kg last year.

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