Tesla 21700 battery energy density is increased by 30%

Tesla has zoomed in again! According to foreign media reports, Tesla CEO Musk said that Tesla has made breakthroughs in battery technology, energy density increased by 30%, and production costs have dropped significantly. Tesla models can reach more than 640km. If battery raw material prices are stable, Tesla can reduce battery cell costs to $100/kWh by the end of 2018.

It is reported that if this technical indicator is realized, the battery pack of Tesla's model will be upgraded. For example, the P100D model will be equipped with a 130kWh battery pack. The comprehensive cruising range of the P100D model will be It reached 644km.

Tesla has always been known for its cool pull. He used the "Heavy Falcon" carrier rocket to send electric sports cars into space. The first mass-produced 21700 power battery has set off a high-energy cyclone for power batteries around the world. They have turned to 21700 batteries. Earlier this year, Tesla announced that the 21700 battery system jointly developed with Panasonic had an energy density of 300Wh/kg. Musk stressed that this is “the highest energy density and lowest cost battery in the current production battery”. This time Tesla has put a high-energy tactic, and it is doubtful that Tesla's research and development speed is equipped with the "Falcon Rocket."

Generally, there are two main ways to increase the energy density of a power lithium battery. One is to improve the specific energy of the cell by improving the mechanism performance of the lithium battery material system. This method has very high requirements for material development and matching. Progress is slower. Second, through the production control of the model and process, the capacity of the large cell is increased. According to the battery China network, domestic ternary battery companies are moving toward a high-nickel system, while lithium iron phosphate battery companies mainly increase the energy density through physical means, and increase the capacity of large cells to become the two.

Not long ago, Tianjin lishen developed a power battery cell with a specific energy of 302 wh / kg, which is the first way. Based on the preliminary research on nickel-nickel-cobalt-aluminum-lithium (NCA) cathode materials, high-nickel cathode materials for lithium-ion power batteries with high specific energy, long cycle life and good safety performance have been developed; nano-preparation and nano-dispersion A variety of technologies, such as cladding and pre-intercalation of lithium, are developed for silicon carbon anode materials with high capacity, high first efficiency, cycle stability and high rate performance.

In addition to the introduction of high-nickel materials to increase the energy density of the power battery, starting from the product model design, the effect of improving the battery energy density by changing the battery size is also very significant. According to the data disclosed by Tesla, under the current conditions, the energy density of the 21700 battery system produced by it is about 20% higher than the 250Wh/kg of its 18650 battery system. From the test data of Panasonic's power lithium battery cells, the volumetric energy density of the 21700 battery is much higher than that of the 18650 battery cell. The energy density of the single cell is much higher than the 20% increase after the group. In the context of the national new energy subsidies and battery energy density, domestic battery companies have turned from 18,650 to 21,700.

According to the battery China Network, the 21700 production line of Yiwei Lithium Energy has been officially completed and put into production. The lion technology 21700 battery is now in small batch production. It can be put into production around the end of 2018, with a capacity of 3GWh, and finally achieve the goal of achieving an energy density of 300Wh/kg by 2020. The 21,700 batteries of the BAK battery have been completed several times off-line and are expected to be mass-produced in the fourth quarter of 2018. In addition, Far East Foster, Tianpeng Power and other battery companies also laid out 21,700 batteries. It is reported that the Tianpeng No. 2 production base has equipment to produce 21700 batteries with an energy density of 200-240Wh/kg.

However, due to limitations in materials, the lithium iron phosphate battery has a limited effect by improving the material properties to improve the energy density of the monomer. Under the current technical conditions, the physical method is more limited by reducing the weight of the battery pack and performing light weight treatment. . According to the battery China network, Penghui Energy, Thornton New Energy, Hunan Sanxun and other battery companies have reduced the weight of the battery pack by physical measures to increase the energy density. The effect is quite remarkable.

Battery China Network believes that energy density is one of the core performance indicators of power batteries. Seeking higher energy density is the goal that battery companies are striving for. Regarding the specific details of this Tesla technology breakthrough, the foreign media did not disclose whether Tesla has any help to help us. In any case, Tesla's renewed breakthrough is an inspiration to the entire power battery industry, and it is also a spur to domestic battery companies. Challenge the higher energy density, whether it is a foreign company or a domestic enterprise are on the same front, the road ahead is still very long, but the future must be bright.

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