As a key part of the lithium battery manufacturing process, the ultrasonic welding process is applied to the lithium battery; aluminum foil/copper foil positive and negative current collectors, electrodes, and battery packaging are connected at multiple locations. Any defect in the welded joint will affect the consistency of the performance of the lithium battery. So it is necessary to understand the ultrasonic welding process. In the ultrasonic welding process, the sensor converts high-frequency electrical signals into ultrasonic vibration signals. The high-frequency vibration is transmitted to the surface of the welded metal through the welding joint, and the interface metal oxide film is broken under a certain pressure and strength. Ultrasonic vibration and friction, under the combined action of friction and ultrasound, further soften the flow and diffusion of plastic, gradually increase the connection area and finally realize the connection. The strength of the welded joint decreases as the pressure increases. The welding pressure changes the sliding resistance. A small welding pressure will cause the sliding resistance of the interface to be small, so that the energy generated by friction is not enough to form an effective connection at the interface, and the welding pressure will cause the tool head to be pressed too deeply. Therefore, the advancing welding pressure parameter plays a decisive role in welding quality. The welding time directly affects the energy input during the welding process, and has a direct effect on the welding effect. The welding time is too short and the input energy is insufficient. Due to insufficient friction, it is difficult to form an effective solder joint; if the welding time is too long, the temperature rises and mutual friction causes the workpiece material to soften. The oxide film at the interface of the welding zone is destroyed and plastic deformation, which can form more Good connection, when the welding time is further extended, the welding head is likely to form deeper marks on the surface of the workpiece, which will affect the welding effect. If the welding time is too long, it will easily cause the welding head and the workpiece to be welded. In the ultrasonic welding process, the vibration system formed by the workpiece and the workpiece directly affects the instantaneous speed of vibration at the interface of the workpiece, and ultimately affects the frictional heating and plastic deformation, thereby affecting the welding quality.

First, adjust the power switch of the electrode rolling machine,Then wipe the steel roller with a cloth dipped in alcohol. Confirm the following three points before starting up. 1. Check that the emergency stop switch remains connected before powering on 2. The surface of the steel roller is dry, clean, free of oil and particles. 3 Adjust the gap between the steel rollers. There are different rolling parameters in the battery mode. Don't move around here. Pay attention to the rolling stroke to avoid motor failure. Second, take a suitable electrode roller press, 1 Adjust the gap between steel rolls to the range of process requirements. 2. Keep the balance between the electrode and the micrometer. Place the material on the unwinding shaft and adjust it to a proper position. Place the electrode between the two rollers. The electrode is required to be parallel to the front and back, and cannot be mounted sideways in the air or tilted. Turn on the tension system and automatic correction system in front of the roller press, and pay attention to adjusting the tension not too tight or too loose. Third, during the electrode rolling process, the weight requirements are as follows: 1. Pay attention to the perpendicularity of the electrode and the micrometer. 2. Keep the hand movement speed the same as the electrode movement speed. After the material is rolled, the surface of the roller should be wiped. Use an anti-rust agent to wipe the surface of the roller to keep it clean. If there are no two roller presses, one roller press must be used to process the cathode and anode at the same time, and the roller must be cleaned. In addition, the electrode will have moisture after being rolled, so it should be placed in an oven for baking.

How Much Lithium Carbonate Is Needed In An Electric Car First of all, judging from a big assessment, someone once investigated lithium iron phosphate battery companies.According to them, about 1GWh of lithium iron phosphate battery requires 2000-2500 tons of cathode material, and one ton of lithium iron phosphate material requires about 0.25 tons of lithium carbonate( LiCoO2 ) From a micro point of view: a 60kWh lithium iron phosphate battery, a car needs 30kg lithium carbonate; From a macro point of view: if we calculate according to a 60kWh car, 100,000 cars 6GWh and 1 million 60GWh, the corresponding demand for lithium carbonate is 30,000 tons respectively.According to China's lithium carbonate output in 2020 is 166,000 tons, a year-on-year increase of 4.4%, of which battery-grade lithium carbonate production is 106,000 tons, and industrial-grade lithium carbonate production is 60,000 tons.That is to say, 100,000 tons of battery-grade lithium carbonate, all made of lithium iron phosphate batteries correspond to 200GWh. At that time, another argument was that 0.25 tons of lithium carbonate was used as a positive electrode lithium iron phosphate material of 10,000 tons, corresponding to 4-5GWh batteries, which was related to the difference in energy density.

Xiamen Tungsten New Energy issued an announcement saying that the investment is not less than 10 billion yuan to build 100,000 tons of lithium iron phosphate,60,000 tons of ternary materials and other cathode materials projects. If the project is successfully implemented, it means that Xiamen Tungsten New Energy will add lithium iron phosphate materials based on the main products of lithium cobalt oxide and NCM ternary materials. Behind Xiamen Tungsten New Energy's deployment of lithium iron phosphate materials is the rapid return of the advantages of low cost and high safety performance of lithium iron phosphate batteries to the new energy passenger car market. The installed capacity of lithium iron phosphate power batteries has increased significantly, driving the shipments of lithium iron phosphate materials GGII survey data show that lithium iron phosphate batteries are showing a rapid growth trend, and the market share continues to increase.It is estimated that by the end of this year, lithium iron phosphate batteries will account for more than 40% of the power market, and shipments in 2021 are expected to grow by more than 200% year-on-year.

As the current collector of lithium battery cathode materials aluminum foil has a low cost ratio in lithium batteries but is indispensable. Driven by the continued boom in the new energy automotive industry, the market demand for lithium battery aluminum foil ushered in an explosion The energy vehicle market continued its high growth trend in the fourth quarter of last year, which led to a significant year-on-year increase in power battery installed capacity, and a surge in demand for lithium battery aluminum foil market, which helped many aluminum foil companies to increase their orders and shipments. Unlike the aluminum foil used for the positive electrode current collector of lithium batteries and the copper foil used for the negative electrode, both the positive and negative electrode current collectors of sodium ion batteries can use aluminum foil, which will create new market growth space for aluminum foil. Corresponding to the huge market demand. At present, only a few companies in China, such as North China Aluminum, Nanshan Aluminum, Dingsheng New Materials, Dongyang Branch, Mingtai Aluminum, and Wanshun New Materials, have the ability to mass produce and supply aluminum foil for lithium batteries. And the overall production capacity is small.

Sodium-ion batteries and lithium-ion batteries "dance" "Sodium-ion batteries are not a substitute for lithium-ion batteries, but are complementary to lithium-ion batteries, alleviating the anxiety of lithium resources in the power battery industry and preventing the future from getting stuck." Currently, secondary batteries are mainly lead-acid batteries and lithium-ion batteries. Lithium-ion batteries are undoubtedly the best in secondary batteries. However, with the widespread popularity of electrification, the shortage of reliance on overseas lithium resources has become increasingly prominent, and it is difficult to complete the important task of my country's energy reform by relying solely on lithium-ion batteries. It is urgent to innovate another technical route. Sodium ion batteries have the advantages of low cost, long life and high safety performance. Not only can it become a supplement to lithium-ion batteries to a certain extent, but also alleviate the shortage of lithium resources. It can also gradually replace lead-acid batteries with serious environmental pollution to ensure my country's energy security and sustainable social development. The Institute of Physics of the Chinese Academy of Sciences has made many attempts in the development of sodium ion batteries. In terms of cathode materials, it is the first time that the Cu2+/Cu3+ redox couple, which is inactive in lithium ion batteries, has electrochemical activity in sodium ion oxide. Based on this, a ternary cathode material of copper, iron and manganese was designed, which has excellent stability, electrochemical performance, and lower cost. The invention patent has been authorized by China, Japan, the United States and the European Union at the same time. In terms of anode materials, the Institute of Physics focuses on carbon materials, aiming to develop a low-cost amorphous carbon anode material, and proposes to use anthracite, a cheap precursor, to become an amorphous carbon material. Now it can achieve 260 Ah/kg, taking into account cycle life and cost. In addition to the advantages of abundant reserves and low cost, sodium ion batteries also have the advantages of easy manufacturing, low cost, high safety, long life, wide temperature range and high rate. The application scenarios are mainly for fields below 150Wh/kg, including various energy storage, electric bicycles, and low-speed electric vehicles.

250mm Doctor Blade Shipped to Singapore Wet film applicator, also called as doctor blade, it is a good device for lab coin cell battery electrode making, update to digital display, very nice for researcher to coat slurry on the copper foil and aluminum foil. Dr.Anees from Singapore who sent inquiry to us on alibaba platform, he was interested in 250mm coating width and equipped with slurry guide plate on the doctor blade for better pour into the slurry. The doctor blade is made by stainless steel material, make wet film thickness between 0 - 5000 microns and the display accuracy is 1 microns. We have it in stock, so we arrange delivery in 48 hours after they confirm and pay the order.

The difficulty of electrolyte VC additives   Introduction:Vinylene carbonate (VC) is a common SEI film forming additive. VC polymerizes on the surface of the negative electrode in a lithium ion battery to form a dense SEI film, thereby preventing further reduction and decomposition of the battery electrolyte on the surface of the anode electrode.   Since the beginning of this year, the supply of electrolyte additive VC has continued to be tight, and the VC additive gap has continued to grow. Some electrolyte additive manufacturers have placed VC orders in the first half of 2022.   At present, the quotation of VC bulk orders has soared to 270,000/ton, an increase of 68%-80% from the average market price of 150,000 to 160,000 last year. And VC manufacturers have the same words, "The core issue now is not price, but production capacity."   VC additives are mainly used to improve the capacity and cycle life of batteries. As the proportion of VC added to lithium iron phosphate batteries is much higher than that of NCM batteries, as the production and sales of lithium iron phosphate continue to pick up, the supply of VC continues to increase.   The preparation method of VC additive is relatively open, but the purity of the product is required to be high, because traces of impurities may affect the performance of the lithium battery.   At the same time, the production of VC additives has a certain degree of danger, and has high requirements for safe production and environmental protection. The relevant management departments have strict requirements for the construction, commissioning, and operation of projects involving hazardous chemicals.   It is worth mentioning that previously, due to less market demand for VCs, fierce price war competition, and strict control of production under environmental supervision, a number of VC manufacturers cut production and stopped production last year. It is more difficult to resume production in the later stage, which greatly reduces the overall supply of VC.   In order to ensure the supply of production capacity, Hankang Chemical (Xinzhoubang Holding Subsidiary), Zhejiang Tianshuo (Tianci Materials Holding Subsidiary), Suzhou Huayi (October Co., Ltd.), Huasheng Lithium Battery, Yongtai Technology, etc. are all in Accelerate the expansion of the deployment of additives. However, limited by VC's technology, patent barriers, and process requirements, it is difficult to expand production. It is expected that the VC gap may continue until the second half of next year.