Tesla 21700 Battery Energy Density Raised 30%

- Jun 19, 2018-

According to foreign media reports, Tesla CEO Mark Musk said that Tesla has made breakthroughs in battery technology, energy density increased by 30%, and the production cost has dropped significantly, the cruising range of the Tesla models can reach more than 640km .

Tesla zoomed in again! According to foreign media reports, Tesla CEO Mark Musk said that Tesla has made breakthroughs in battery technology, energy density increased by 30%, and the production cost has dropped significantly, the cruising range of the Tesla models can reach more than 640km . If the raw material price of the battery is stable, Tesla can reduce the cost of battery cells to US$100/kWh by the end of 2018.

It is reported that if this technical indicator is achieved, the battery pack of Tesla’s models will be upgraded. Taking the P100D model as an example, the model will likely carry a 130kWh battery pack, and the integrated range of the P100D model will be It reaches 644km.

Tesla has always been known for its cool pull style. He used the "heavy Falcon" carrier rocket to send electric sports cars into space. The first mass production of the 21700 power battery set off a high-powered whirlwind of power batteries in the world, and the global lithium giants Have turned to 21700 batteries. Earlier this year, Tesla announced that its 21700 battery system, jointly developed with Panasonic, had an energy density of 300Wh/kg. Musk emphasized that this is "the highest energy density and lowest cost battery currently available for mass production." The Tesla once again put high energy and big moves, can not help but wonder whether Tesla's R&D speed is equipped with the "Falcon Rocket."

Under normal circumstances, there are mainly two ways to increase the energy density of power lithium batteries: Firstly, by improving the mechanism and performance of the lithium battery material system to increase the specific energy of the battery cells, this method requires very high material development and matching. Progress is slower. The second is to increase the capacity of the battery core specifications by controlling the production of the models and processes. According to Battery ChinaNet, domestic ternary battery companies are advancing toward the high-nickel system, while lithium iron phosphate battery companies mainly increase their energy density through physical methods, while increasing the size of their larger single-cell batteries has become a common choice.

Not long ago, Tianjin Lishen developed a power battery cell with a specific energy of 302 wh/Kg, which is the first method adopted. Based on the previous research on nickel-cobalt-aluminum-oxide (NCA) cathode materials, we have developed high nickel-based cathode materials for lithium ion power batteries with high specific energy, long cycle life, and good safety performance; , coating and pre-embedded lithium and other technologies to develop high-capacity, first-time high efficiency, cycle stability and rate performance good silicon carbide anode material.

In addition to introducing high-nickel materials to increase the energy density of the power battery, starting from the product model design aspect, the effect of improving battery energy density by changing the battery size is also very significant. According to the data disclosed by Tesla, under the existing conditions, the energy density of the 21700 battery system it produces is about 20% higher than the 250Wh/kg of its 18650 battery system. From the test data of Panasonic's power lithium battery, the volume energy density of its 21700 battery is much higher than that of the 18650 battery cell. The increase in the energy density of the single cells is much higher than the increase of 20% after the group. In the context of the country's new energy subsidies linked to battery energy density, domestic battery companies have shifted from 18650 to 21700.

According to the battery China Network, Yi Weigao's 21700 production line has been officially completed and put into operation. Lunshi Technology 21700 battery is now in small batch production, about 2018 can be put into operation around the end of the production capacity of 3GWh, and ultimately in 2020 to achieve energy density of 300Wh/kg goal. BBC Battery's 21700 batteries have completed a number of offline betas and are expected to begin mass production in the fourth quarter of 2018. In addition, battery companies such as Far East Foster and Tianpeng Power also laid out 21,700 batteries. It is reported that equipment manufactured on the Tian Peng No. 2 production base produces 21,700 batteries with an energy density of 200-240 Wh/Kg.

The lithium iron phosphate battery is limited in terms of materials, and the effect of improving the performance of the material to improve the energy density of the monomer is relatively limited under current technical conditions. By reducing the weight of the battery pack, physical methods such as lightening are more obvious. . According to the battery China Net, Penghui Energy, Thornton New Energy, Hunan Sanxun and other battery companies through physical measures to reduce the weight of battery packs to enhance energy density, the effect is more significant.

Batteries China Network believes that energy density is one of the core performance indicators of power batteries. Seeking higher energy densities is the goal of battery companies. Regarding the specific details of Tesla’s technological breakthrough, foreign media did not reveal whether Tesla’s divine power helped us. In any case, Tesla's renewed breakthrough is an inspiration to the entire power battery industry and a spur to domestic battery companies. To challenge higher energy density, both foreign companies and domestic companies are on the same front and the road ahead is long, but the future must be bright.