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The process of 18650 lithium battery pack is mainly based on the structure of pack battery, and most of the 18650 lithium battery pack process features are similar. The distinctive features of the 18650 lithium battery PACK process are multiple parallel and multiple series. The greatest feature of the 18650 lithium battery Pack is its flexible combination, most of which can be semi-automated. TOB ...
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The most widely used battery is still lithium battery, but lithium battery also has some problems that need to be improved. One of the key problems is that the lithium battery cathode produces excess oxygen, which reacts with the electrolyte and causes a thin film to form on the surface of the battery cathode, reducing energy transfer and thus the overall performance of the battery. To solve this ...
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NCA cathode materials batteries have high specific energy, good specific power and long service life similar to NMC cathode battery. But the disadvantages of NCA cathode batteries are low safety and high cost. NCA is a further development of lithium nickel oxide. The addition of aluminum gives the battery greater chemical stability. High energy and power density and good service life make NCA a ca...
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The first is to confirm and bake the battery material. Generally, the battery conductive agent needs to be baked at 120℃ for 8 hours. The PVDF powder should be baked at 80℃ for 8 hours. The cathode active material (LFP, NCM, etc.) depends on the state and process of incoming material whether it needs to be baked and dried. After drying, (wet process) Mixing the PVDF powder and NMP solvent to make ...
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The anode of lithium battery is composed of anode active materials, conductive agent, battery binder and dispersant. The conventional anode electrode system is a water mixing process (the solvent is deionized water), so the incoming material does not require drying. This process requires: Conductivity of deionized water ≤1us/cm. Workshop temperature ≤40℃, Humidity :≤25%RH. After confirmation of th...
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The cathode electrode coating is the cathode slurry extrusion coating or spraying on the cathode current collector aluminum foil, the density of one side is 20 to 40 mg/cm2. Coating oven temperature conventional 4-8 sections (or more), each section of baking temperature 95℃ ~ 120℃ according to the actual needs to adjust, to avoid baking cracking transverse cracks and solvent phenomenon, the speed ...
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Drying the battery cathode electrode after battery coating process, it is necessary to roll the coated battery electrode foil during the process time. The electrode rolling process is to compacting the coated electrode, at present there are hot pressing and cold pressing two processes of battery electrode rolling press. Battery electrode hot press compaction rate is higher than cold press, and the...
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After the slitting process, the cathode and anode electrode piece should be dried (cathode 120℃, anode 105-110℃). Then is the battery tab welding and high temperature adhesive taping process. The length of the battery tabs and the shaping width need to be taken into account. Take the 18650 battery as an example, The design of the battery cathode tabs exposure mainly takes into account the reasonab...
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Battery electrode winding is the separator, cathode sheet, anode sheet through the battery electrode winding machine into a single battery cells. TOB New Energy can provide the battery winding machine for 18650 lithium-ion cylindrical cell precision winding for 18650 production line. The principle of battery winding is to use the anode to cover the cathode, and then through the battery separator t...
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Hi-pot test voltage of 200 ~ 500V is required before the battery cell is put into the battery stainless steel case(Test for high voltage short circuit) and vacuuming processing(Control dust further before loading the battery cells). We can provide the most professional lithium battery cells short circuit tester. Moisture, burr and dust are the three control points of lithium battery manufacturing,...
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Insert the welding needle (usually made of copper or alloy) into the middle hole of the rolled battery cells. The specifications of commonly used welding needles are Φ2.5*1.6mm,It is qualified to reach welding strength of anode electrode tab ≥12N, low strength can lead to the unstable welding and larger internal resistance. If the welding strength is too high, it is easy to destroy the nickel laye...
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After the battery cells drying process, the battery cell will be tested for moisture and meet the standard before proceeding to the next step of battery electrolyte filling process（cylindrical cell）. Put the roasted battery cell into the vacuum glove box quickly, weigh it and record the weight, place the injection cup on the upper side of the battery and add the electrolyte into the cup. If not su...
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Take the laboratory scale battery caps welding machine as an example, Put the battery caps and battery spot welder in the glove box in advance, place the battery caps on the mold of the battery spot welder, hold the battery cells on the other hand, align the cathode battery tabs of the battery cell with the caps, after confirming the spot welding position is correct, depress the foot pedal. After ...
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Vacuum drying is to place the materials to be dried in a closed space, and use vacuum equipment to lower the air pressure in the closed space to an atmospheric pressure, while continuously heating the materials, so that the water molecules in the materials gradually diffuse to the surface of the materials due to the effect of pressure difference and concentration difference, and after the material...
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In the structure of lithium-ion battery cells, the battery tab is the metal conductor that leads from the cathode and anode electrodes of the cell, and the complete battery tab is mainly composed of high temperature insulating adhesive and metal conductive substrate. High-temperature insulating adhesive is the insulating part on the battery tabs, for pouch cell, its role is to prevent the short ci...
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The packaging method of lithium battery depends on the shell material it uses. In general, only lithium pouch batteries will use aluminum laminate film and heat sealing. The metal cans batteries are usually sealed by laser welding. Aluminum laminate film generally has three layers, respectively nylon layer, Al layer, PP layer. Nylon layer is to ensure the appearance of aluminum laminate film,...
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The battery cells of the pouch cell battery can be designed into different sizes according to the needs of customers. When the pouch cell case size is well designed, it is necessary to make the corresponding mold to make the aluminum laminate film forming. The pouch cell case forming process is using the forming mold to punch out a pit on the aluminum laminate film that c...
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After the aluminum laminating film is formed and cut into shape, it is generally called Pocket, as shown in the following figure. In general, when the battery cells is thin, select a single pit (left below), and when the battery cells is thick, select a double pit (right below). Besause when the deformation of aluminum laminate film is too large, it will break through the deformation limit of alum...
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Lithium battery production process mainly includes battery cathode and anode slurry mixing, positive and negative electrode coating, roller pressing, electrode cutting, battery electrode making and die cutting, respectively corresponding to mixer, coating machine, roller press, slitting machine, electrode notching machine and electrode die cutting machine. The previous process of lithium battery -...
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After pouch cells top sealing and side sealing, need to do X-ray to check the alignment of the battery cells, then put the battery cells into the drying room for drying(you can also use the drying oven to drying the battery cells). After the battery cells drying process is completed, The next step is electrolyte filling process and primary sealing process. Through the introduction of the previous ...
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