18650 lithium ion battery 3.7v technology level

　　Official data shows that the current energy density of CATL’s square-shell batteries has reached 240Wh/kg, and the technical plan is to increase the energy density of the batteries to 300Wh/kg by 2020.

　　While increasing the energy density through the 811 ternary cathode + silicon/carbon hybrid anode, sacrifices must be made in terms of cycle, high temperature performance, cost, safety, etc. At the same time, the production process and environmental requirements are also relatively demanding. Informed sources revealed to First Electric Network that the energy density of square-shell batteries supplied in large quantities by CATL in 2017 was between 190 and 210 Wh/kg, and is likely to increase to 210 and 230 Wh/kg in 2018.

　　As early as early 2017, CATL launched the "New Generation Lithium-ion Power Battery Industrialization Technology Development" project to develop lithium-ion power batteries with high-nickel ternary materials as the positive electrode and silicon-carbon composites as the negative electrode. In 2017, CATL's total production capacity was 17.09Gwh, and the new prospectus just released shows that when the Huxi lithium-ion power battery production base project reaches production, CATL will add 24GWh of new 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 batteries at this stage is 220Wh/kg, and the goal is to achieve 300Wh/kg before 2020. Today, BYD's total power battery capacity is 16GWh, of which lithium iron phosphate batteries account for 9GWh and ternary lithium batteries account for 7GWh.

　　Internationally, square case batteries 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 target of 350Wh/kg in 2023. Perhaps in 2017, Samsung has really achieved mass production of 250Wh/kg square case batteries, but it is reported that it may use NCA ternary cathode material.

　　There are many types of square case batteries, and according to customer requirements, battery companies can customize them in terms of capacity, shape and size. Taking into account the difference in the material formulas of the positive and negative electrodes, the energy density between square case batteries of the same specification is more comparable. The gap in cell energy density between domestic and foreign leading square case power battery companies may be very small. Perhaps based on this technical condition alone, China may not lag too far behind.

　　Regarding new equipment, Ruidefeng established an automation department to independently develop automation equipment to help improve production efficiency. At the same time, it also cooperated with the company to develop automation equipment and production lines.

　　Regarding the new structure, Ruidefeng has completed the preliminary verification and experimental work of low-cost poles, completed the low-cost and high-capacity structural design and sample production; completed the aluminum shell R-angle support weight-saving structural design and mass production; and new RDF Explosion-proof valve structure, flip plate structure samples, etc.

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

　　In terms of the introduction of new materials, Ruidefeng has completed the verification of multiple new materials (composite materials, conductive materials) for various functional components. Currently, it has a total of 156 patents.

　　Wang Sixheng said that while maintaining close cooperation with downstream customers, Ruidefeng is also proactively conducting leading research on product formats, product processes, product performance, quality control, etc. In the future, Ruidefeng will be an overall solution provider for power battery structural parts and provide 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, it contains a protection circuit and shell and can be used directly.

　　The composition of lithium-ion secondary rechargeable battery is as follows: battery cell + protection circuit board. Rechargeable batteries remove the protective circuit board and it becomes the battery core. It is the electricity storage part of the rechargeable battery. The quality of the cell directly determines the quality of the rechargeable battery.

　　Remove the casing of the mobile phone's electrical panel, and then remove the protective circuit board inside the electrical panel, leaving only the lithium battery core.

　　Batteries are divided into three types: aluminum shell batteries, soft-packed batteries (also known as "polymer batteries"), and cylindrical batteries. Usually mobile phone batteries use aluminum-shell batteries, digital products such as Bluetooth mostly use soft-pack batteries, and laptop batteries use a series-parallel combination of cylindrical batteries.

　　The particle size is small, the specific surface area is large, the color is white, the purity is high, and the electrochemical performance is significantly improved. It can be used in lithium titanate battery materials and lithium cobalt oxide battery materials. 1: It shows typical Faraday pseudocapacitance behavior in the potential range of -0.05~0.35V (vsSCE). The so-called pseudocapacitor is a pseudocapacitor developed after the electric double layer capacitor. Pseudocapacitance is also called Faraday quasi-capacitance. For Faraday quasi-capacitance, the process of storing charge includes not only the storage on the electric double layer, but also the storage of charge in the electrode due to the redox reaction of ions in the electrolyte in the electrode active material. The ions in the electrolyte, generally H or OH-, diffuse from the solution to the electrode/solution interface under the action of an external electric field, and then enter the bulk phase of the active oxide on the electrode surface through the electrochemical reaction at the interface; because the electrode The material uses an oxide with a large specific surface area, so that a considerable number of such electrochemical reactions will occur, and a large amount of charge will be stored in the electrode. During discharge, these ions that enter the oxide will return to the electrolyte, and at the same time, the stored charge is released through the external circuit. This is the charging and discharging mechanism of Faraday quasi-capacitor. To put it more clearly, pseudocapacitance is just countless small electric double layer capacitors. 2: Under the same current density (mA/cm2), increase the specific capacity (F/g). 3: Reduce self-discharge rate and have good cycle life. Ingredients: Nano titanium dioxide (XZ-TI01) Appearance: white powder; PH value: 6-8; Particle size: 10 nanometers; Specific surface area: 60-70m2/g; Purity: 99.9%, weight loss on drying 105℃, 2h≤0.05 (%); weight loss on ignition ≤ 0.1 (%); iron ppm ≤ 3 qualified lead (Pb) ppm ≤ 10 qualified. Packaging: 10kg/paper drum lined with plastic film bag

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