Power lithium battery cell technology level -Lithium - Ion Battery Equipment

Power lithium battery cell technology level -Lithium - Ion Battery Equipment

Official data shows that the energy density of square shell cells in the Ningde era has reached 240Wh/kg at this stage, and the technical plan is to increase the cell energy density to 300Wh/kg by 2020.

While improving the energy density through the 811 ternary positive electrode + silicon/carbon hybrid negative electrode, the cycle, high temperature performance, cost, safety, etc. have to be sacrificed, and the production process and environmental requirements are also relatively harsh. People familiar with the matter revealed to the first electric network that in 2017, the energy density of square shell cells supplied in large quantities by Ningde era was between 190 and 210Wh/kg, and it is likely to increase to 210-230Wh/kg in 2018.(Lithium - Ion Battery Equipment)

As early as the beginning of 2017, CATL launched the "New Generation Lithium-ion Power Battery Industrialization Technology Development" project to develop lithium-ion power batteries with high-nickel ternary material as the positive electrode and silicon-carbon composite as the negative electrode. In 2017, the total production capacity of Ningde era was 17.09Gwh, and the new version of the prospectus just announced shows that when the Huxi lithium-ion power battery production base project is put into production, Ningde era will add 24GWh of production capacity, and the total production capacity will reach 41.09GWh .

BYD insiders broke the news that the energy density of BYD's mass-produced cells at this stage is 220Wh/kg, and the goal is to achieve 300Wh/kg by 2020. Today, the total production capacity of BYD power batteries is 16GWh, of which lithium iron phosphate batteries account for 9GWh and ternary lithium batteries account for 7GWh.

Internationally, square shell cells are also the main product of Samsung SDI. In 2017, Zheng Shixiong, vice president of Samsung SDI Co., Ltd., publicly stated that the energy density of Samsung SDI power batteries is currently 250Wh/kg, and is expected to reach the goal of 350Wh/kg in 2023. Perhaps in 2017, Samsung has really achieved mass production of 250Wh/kg square shell cells, but it is estimated that NCA ternary cathode materials may be used.

There are many types of square shell batteries, and battery companies can customize in terms of capacity, shape and size according to customer requirements. Considering the difference in the formulation of positive and negative materials, the energy density between square-shell cells of the same specification is more comparable. The gap between domestic and foreign leading square shell power battery companies in terms of cell energy density may be very small. Perhaps from this technical point of view, China may not be too far behind.

On the new equipment, Redfeng established an automation department to independently develop automation equipment to help improve production capacity efficiency. At the same time, it also cooperated with the development of automation equipment and production lines.

In the new structure, Redfeng has completed the preliminary verification and experimental work of the low-cost pole, completed the low-cost and high-capacity structural design and sample production; completed the design and mass production of the aluminum shell R-angle support weight reduction structure; and a new RDF Explosion-proof valve structure, flip sheet structure samples, etc.

In the exploration of new processes, Redfeng has developed a waste-free process for the top cover and upper pole pieces, and the material utilization rate has been increased from 40% to 80%; through the new welding process, copper-aluminum laser welding, copper-aluminum resistance welding, metal plastic The preliminary research and application of welding, electromagnetic pulse welding and molecular diffusion welding; the verification and experiment of the waste-free process of the aluminum shell are in progress; in addition, the initial sample of the weight reduction plan for the top cover sheet has also been completed.

In the introduction of new materials, Redfeng has completed the verification of various new materials (composite materials, conductive materials) for various functional components. At present, there are a total of 156 projects in its various patents.

Wang Sisheng said that while maintaining close cooperation with downstream customers, Redfeng is also forward-looking in conducting leading and pioneering research on product formats, product processes, product performance, and quality control. In the future, Ridfeng will be an overall solution provider for power battery structural parts, providing customers with overall structural packaging services.

Refers to a single electrochemical cell containing positive and negative electrodes, which is generally not used directly. Different from the battery contains protection circuit and shell, can be used directly.



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