Detailed analysis of the manufacturing process of lithium battery cells

The manufacturing process of lithium-ion batteries was introduced in detail. The battery manufacturer explained the manufacturing process of lithium-ion batteries in detail. The battery is composed of a battery connected in series. When the capacitor is added in parallel, the voltage remains unchanged. When the voltage is doubled in series, the capacity remains unchanged. However, the failure of a single battery will automatically exit. In addition to reducing the capacity, the parallel operation is not affected, and the parallel technology is relatively strict. When a unit battery is short-circuited in parallel, the current in the parallel circuit is very large. First in series and parallel: According to the capacity of the entire lithium-ion battery assembly equipment, first 1/3 of the entire battery capacity in series and parallel, and then in series and parallel to reduce the failure probability of large-capacity batteries. Lithium-ion battery products 2. Battery requirements: Choose the appropriate battery according to your design requirements. The parallel and series requirements of the lithium-ion battery produced by the lithium-ion battery spot welder are the same model. The difference between the capacity, internal resistance, and voltage value must not exceed 2%. Under normal circumstances, after the batteries are connected in series, the capacity loss is 2%-5%. The more batteries, the greater the capacity loss. Whether it is a flexible battery or a cylindrical battery, multiple combinations are required. If poor consistency affects battery capacity, the battery with the lowest capacity in the group determines the capacity of the entire battery. High current discharge performance is required. High current discharge can improve the dynamic performance of the motor. The battery should be properly cooled. Due to the large number of batteries, the temperature rise of the batteries in the battery box is not easily dissipated, resulting in uneven temperature between the batteries, different discharge characteristics, and long-term degradation of battery performance. High-production technology batteries should be able to withstand the impact of bumpy roads, and put forward high requirements on the production process, especially the spot welding process. Post-weld inspection to prevent post-welding and outside welding. The previous process corresponding to the winding and lamination production is the production and die cutting of the pole piece. Production includes pole/pole welding after cutting, pole dust removal, pole protection tape, ear envelope and winding or fixed-length cutting, where the winding is used for subsequent fully automatic winding. The fixed-length cutting rod is used for subsequent semi-automatic winding; the stamping rod is formed by stamping and cutting the segmented parts, and is used for the subsequent bonding process. Lithium-ion battery structure The later production process of 18650 lithium-ion battery is mainly divided into four processes: capacity division, conversion, testing, packaging and storage, accounting for about 35% of the value of the production line. The forming volume and the indexing volume are the most important parts in the later process, which are used for the activation test of the formed battery. Due to the long battery charge and discharge test cycle, the equipment has the highest value. The important function of the conversion process is to charge the battery after charging and packaging, and the separation process is to test the battery capacity and other electrical performance parameters after the battery is activated and perform classification. The conversion and sub-coiling are carried out by the conversion machine and the sub-coiling machine respectively. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of the causes of lead-acid battery failure