Electrode piece coating generally refers to a process in which the evenly stirred slurry is evenly coated on the current collector and the organic solvent in the slurry is dried. The effect of coating has an important impact on the battery capacity, internal resistance, cycle life and safety, and ensures that the pole piece is evenly coated. The selection of coating methods and control parameters have an important impact on the performance of lithium-ion batteries, which are mainly manifested in: 1) Coating drying temperature control: if the drying temperature is too low during coating, it cannot guarantee that the pole piece is completely dry, if the temperature is too high, it may be because the organic solvent inside the pole piece evaporates too quickly, and the surface coating of the pole piece cracks and falls off; 2) Coating surface density: if the coating surface density is too small, the battery capacity may not reach the nominal capacity, if the coating surface density is too large, it is easy to cause batching waste, and if the positive electrode capacity is excessive in serious cases, lithium dendrites will be formed due to the precipitation of lithium to puncture the battery separator and cause a short circuit, causing potential safety hazards; 3) Coating size: The coating size is too small or too large may cause the positive electrode inside the battery to not be completely wrapped by the negative electrode, during the charging process, lithium ions are embedded from the positive electrode and move to the electrolyte that is not completely wrapped by the negative electrode, the actual capacity of the positive electrode can not be played efficiently, and in serious cases, lithium dendrites will be formed inside the battery, which is easy to puncture the separator and cause the internal circuit of the battery;   4) Coating thickness: If the coating thickness is too thin or too thick, it will have an impact on the subsequent electrode rolling process, and the performance consistency of the battery electrode piece cannot be guaranteed. Selection of coating equipment and coating process The coating process in a broad sense includes: uncoiling→ splicing→ tension control → pulling tabs→ coating → drying→ guiding → tension control→ guiding → winding and other processes. The coating process is complex, and there are many factors that affect the coating effect, such as: the manufacturing accuracy of the coating equipment, the smoothness of the equipment operation, the control of the dynamic tension in the coating process, the size of the air volume in the drying process and the temperature control curve will affect the coating effect, so it is extremely important to choose the appropriate coating process.   Generally, the selection of coating method needs to be considered from the following aspects, including: the number of layers to be coated, the thickness of the wet coating, the rheological properties of the coating solution, the...

1.Lithium battery tab material Lithium-ion battery tabs, as shown in the figure below, are metal conductors that lead the positive and negative electrodes out of the battery cells. The complete tabs are mainly composed of insulating sealant and metal conductive matrix. For lithium-ion batteries, the positive electrode uses aluminum tabs, and the negative electrode uses pure nickel tabs or nickel-plated copper tabs. 2. Lithium battery tab structure The internal structure of consumer lithium-ion batteries is mainly divided into four types according to their production methods: normal structure, tab-centered structure, multi-tab structure, and laminated structure. The normal structure of the positive and negative electrodes has only one tab, which is located at one end of the pole piece and is made by winding; the tab in the middle structure is located in the middle of the batteryelectrode, usually through laser cleaning, spacer coating, tape application, etc. The internal resistance of the battery is smaller and the rate performance is better; the multi-tab woundelectrodehas multiple tabs, and the tab positions are different according to the design. The battery resistance is smaller and the rate performance of the battery is better; stacked The sheet battery is made by cutting theelectrodeinto a specific shape and alternately folding the positive and negative electrodes. There is a tab in each layer. The battery with this structure has the best rate performance. 2.1Tab-centered structure The position of the tabs has a significant impact on the internal resistance and rate of the lithium-ion battery. When the tabs are in the middle of the positive and negative electrodes, the battery has the best internal resistance and rate performance, and its performance is close to that of batteries with lamination technology. The picture below shows a comparison between the pole-tab center-mounted structure and the normal structure. The pole-tab of the normal structure is located at one end of the pole piece, while the pole-tab-centered structure has the pole tab located in the middle of the battery pole piece. 2.2 Multi-tab winding structure Thepicture below shows the multi-pole winding structure. The multi-tab winding technology cuts a fixed tab shape into the carrier. After the winding is completed, the carrier is welded and the tabs are drawn out to form a multi-tab battery. Multi-taab winding has more tabs and is more evenly distributed. This structure has better battery rate performance and smaller charge and discharge temperature rise. It is suitable for high-power equipment. Currently, many drones use this structure. Due to its welding requirements and higher precision, batteries made with this structure are more expensive. The advantages of the multi-tab structure are: further reducing the battery impedance, improving the battery's high-rate charge and discharge performance, and supporting 5C~10C discharge; effectively reducing the temperature rise of ...

1. The battery is swollen and leaking If the water content in the lithium-ion battery is excessive, it will chemically react with the lithium salt in the electrolyte to form HF: Hydrofluoric acid (HF) is a very corrosive acid that can be very damaging to battery performance: HF destroys the SEI membrane (Solid-Electrolyte-Interface) inside the battery and reacts with the main components of the SEI membrane: Finally, LiF precipitation is generated inside the battery, so that the lithium ions undergo an irreversible chemical reaction in the negative electrode piece of the battery, and the active lithium ions are consumed, and the energy of the battery is reduced.   When there is enough water, more gas is generated, and the pressure inside the battery will increase, which will cause the battery to be deformed by force, and there will be dangers such as bulging and leakage of the battery.   Most of the battery swelling and opening the cover encountered in the use of mobile phones or digital electronic products on the market are caused by high moisture and gas production swelling inside the lithium battery. 2.The internal resistance of the battery becomes larger The internal resistance of the battery is one of the most important performance parameters of the battery, and it is the main indicator to measure the difficulty of the transmission of ions and electrons inside the battery, which directly affects the cycle life and operating state of the battery. The smaller the internal resistance, the less voltage is occupied when the battery is discharged, and the more energy is output. When the water content increases, POF3 and LiF precipitation will be generated on the surface of the SEI membrane (Solid-Electrolyte-Interface) of the battery, which will destroy the compactness and uniformity of the SEI membrane, resulting in the gradual increase of the internal resistance of the battery and the continuous decrease of the discharge capacity of the battery. 3. Shortened cycle life The water content is too large, which destroys the SEI film of the battery, the internal resistance gradually increases, the discharge capacity of the battery becomes smaller and smaller, the use time of the battery becomes shorter and shorter after each full charge, the number of charging and discharging (cycles) of the battery that can be used normally will naturally decrease, and the service time (life) of the battery will be shortened.  Email :tob.amy@tobmachine.com  Skype :amywangbest86  Whatsapp/Phone number :+86 181 2071 5609

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The world is becoming increasingly reliant on batteries, and their role in powering the devices we use every day is only set to grow. From our smartphones to electric vehicles, from renewable energy storage to portable medical equipment, the demand for better-performing, longer-lasting, and more efficient batteries is enormous. And at the forefront of this rapidly expanding industry is TOB - the first brand in the battery lab and pilot line in worldwide. With a focus on research, development, and production of high-quality battery technologies, TOB has established itself as a leader in the field. Utilizing state-of-the-art facilities and cutting-edge techniques, the company has made significant progress in advancing the battery industry. One of the primary areas of expertise for TOB is the development of lithium-ion batteries, which are widely recognized as the most efficient and cost-effective battery technology available. With a team of experienced researchers and engineers, TOB is continually working to improve the performance and safety of these batteries while reducing their environmental impact. In addition to lithium-ion batteries, TOB is also involved in the development of other types of energy storage solutions, including Sodium-ion batteries, solid batteries, Li-S battery and more. Furthermore, the company is focused on exploring emerging technologies such as solid-state batteries, which have the potential to revolutionize the energy storage industry in the future. One of the key areas where TOB excels is in its battery lab and pilot line. These facilities are designed to allow the company to conduct fundamental research on batteries, as well as test and optimize new technologies before they are released into the market. By doing so, TOB can ensure the safety, reliability, and performance of its products, as well as keep up with the ever-changing demands of the industry. To achieve this, TOB has invested heavily in its research and development activities, and the company's scientists and engineers are among the best in the business. Through their collective expertise and experience, they are able to tackle complex problems and develop innovative solutions that drive the industry forward. The benefits of TOB's battery technology are numerous. They offer longer run times, faster charging times, greater environmental sustainability, and improved safety. Moreover, they can be used in a wide range of applications, making them a versatile option for companies and consumers alike. As the demand for better and more efficient batteries continues to grow, TOB's role in the industry will only become more essential. The company's commitment to innovation, quality, and safety means that it is well-positioned to lead the charge in developing the next generation of energy storage solutions. In conclusion, TOB is the first brand in the battery lab and pilot line in worldwide, and its innovative and sustainable battery technologies are...

European battery manufacturer Northvolt has successfully developed sodium-ion batteries and plans to commercialize them in the energy storage field. On November 21, Swedish battery company Northvolt announced that it had developed a state-of-the-art sodium-ion battery with an energy density of over 160 Wh/kg. However, the company did not disclose other technical indicators such as the cycle life of the battery. Sodium-ion batteries use sodium salts as electrode materials. Compared to lithium-ion batteries, sodium-ion batteries have advantages such as abundant resource reserves, low cost, and fast charging, but they lag behind lithium-ion batteries in energy density. Northvolt, founded in 2016, is the most well-known local battery manufacturer in Europe, and has received investments from Volkswagen Group, Goldman Sachs Asset Management and other well-known institutions. According to Northvolt's plan, its first generation of sodium-ion batteries will mainly be used in the field of energy storage, and it plans to release higher energy density sodium-ion batteries in the future, so as to achieve application in the field of electric vehicles. Its CEO and co-founder Peter Carlson told the Financial Times that the new technology of sodium-ion batteries may be worth tens of billions of dollars, as it opens up the energy storage market in the Middle East, Africa and India. According to Carlson's estimation, the order volume of energy storage batteries in the next decade may be larger than the current power battery market. Northvolt said that this type of sodium-ion battery is safer, more cost-effective and sustainable than traditional ternary batteries or lithium iron phosphate batteries. Ternary batteries and lithium iron phosphate batteries are the two main types of lithium batteries. At the same time, Northvolt's raw materials for producing sodium-ion batteries do not include lithium, nickel, cobalt and other minerals, but choose iron and sodium with richer reserves. According to Northvolt, the sodium-ion battery it developed uses Prussian blue cathode material and hard carbon as the anode. This technology line is consistent with the first generation of sodium-ion batteries released by CATL (300750.SZ). CATL released the product in July 2021, with an energy density of 160 Wh/kg. It plans to basically form an industrial chain of sodium-ion batteries this year. CATL also disclosed at that time that the energy density of its next-generation sodium-ion battery will exceed 200Wh/kg, but the product has not yet been released. According to the positive electrode material, in addition to the choice of Prussian white (Prussian blue), sodium-ion batteries also include two major technical routes: layered oxide and polyanion. Another domestic battery giant BYD (002594.SZ) mainly focuses on the latter two technologies. At a sodium-ion battery forum held in July this year, Yin Xiaoqiang, general manager of BYD's energy storage and new battery division, said that the...

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