Analyze the production requirements of lithium battery PACK manufacturers

Lithium battery processing, production requirements of lithium battery PACK manufacturers. The process of assembling lithium battery cells into groups is called PACK, which can be a single battery or battery modules connected in series and parallel. In fact, the process of lithium battery PACK is not difficult. If you master this technology, you can assemble the battery yourself. So, what are the lithium battery PACK manufacturers on the market? PACK includes battery pack, bus bar, flexible connection, protection board, outer packaging, output, barley paper, plastic bracket and other auxiliary materials together to form PACK. In the early days, battery PACK mainly refers to the processing and assembly of lithium battery packs. It is only the foundry of lithium battery assembly, which mainly processes battery cells, battery protection boards, battery connection sheets, label papers, etc., into products required by customers through the battery PACK process combination; But this kind of basic no longer exists, because the cost of lithium batteries has risen, the labor is expensive and the processing profit is low. Lithium battery PACKs are now mainly concentrated in lithium battery PACK factories. They all have their own PACK structure design, PACK electronic design and PACK production workshops. They can carry out independent development and design according to customer needs. Through battery solutions, battery specifications, and batteries After the samples meet the customer's PACK lithium battery customization requirements, the PACK production line in the PACK workshop will be processed, and the products will be shipped after passing the quality inspection. Lithium battery PACK method ①Serial and parallel composition: The battery is composed of single cells in parallel connected in series. Parallel connection increases the capacity and the voltage remains the same. After series connection, the voltage doubles and the capacity remains the same. For example, a 3.6V/10Ah battery is composed of a single N18650/2Ah through 5 parallels. Parallel first and series later: Parallel connection will affect the cycle life of lithium batteries after parallel connection due to the difference in internal resistance and uneven heat dissipation. However, the failure of a single battery will automatically exit. In addition to the reduction in capacity, it will not affect the use after parallel connection. The parallel process is strict. ②Battery core requirements: According to your own design requirements, select the corresponding batteries. The parallel and series batteries require the same type and model, and the difference in capacity, internal resistance, and voltage value is not more than 2%. Under normal circumstances, after the battery is combined in parallel and series, the capacity loss is 2%-5%. The more the number of batteries, the greater the capacity loss. Whether it is a soft-packaged lithium battery or a cylindrical battery, multiple strings are required. If the consistency is poor, the capacity of the lithium battery will be affected. The battery with the lowest capacity in a group determines the capacity of the whole group of batteries. ③The process of PACK: The PACK of the battery is realized in two ways. One is laser welding or ultrasonic welding or pulse welding. This is a commonly used welding method. The advantage is that it has good reliability, but it is not easy to replace. The second is contact through the elastic metal sheet. The advantage is that it does not need to be welded, and the lithium battery is easy to replace, but the disadvantage is that it may lead to poor contact. Lithium battery processing, design requirements of lithium battery PACK manufacturers ●Fully understand the use requirements, such as the application environment (temperature, humidity, vibration, salt spray, etc.), use time, charging and discharging methods and electrical parameters, output methods, life requirements, etc. ●Select qualified lithium batteries and protection circuit boards according to the requirements of use, ●Meet the requirements of size and weight. ●The packaging is reliable and meets the requirements. ●Simplified production process. ●The program is optimized and the cost is minimized. ●Testing is easy to realize the requirements of lithium battery circuit board manufacturers for the assembly of PACK lithium battery packs 1. The polarity of the nickel strip pad and the polarity of the nearby components cannot be exactly opposite, otherwise it is easy to be caused by the staff in the process of soldering the nickel strip. Operation caused a short circuit. 2. The positions of the pad and the reed of the nickel strip should not be exactly opposite, otherwise the solder of the reed terminal will melt due to the temperature of the soldering iron during the process of soldering the nickel strip, and the reed will easily fall off in the future. 3. The size of the pads of the nickel strip and the reed should be set according to the nickel strip and the reed, and the size of the pad should be relatively large so that it is not easy to cause false soldering. 4. The spacing between the reed pads should be as large as possible, because tin and solder paste can easily cause micro-shorts between the pins. If the spacing cannot be changed, a tin-barrier wire should be set between them. 5. The gold plating thickness of the reed needs to be able to pass oxidation and abrasion tests, generally 10 microns. 6. The thickness of the COB board is better than that of the PWB board. The main reason is that the wiring is very thin, and the thick circuit board is not easy to be deformed by external forces, so as to play a protective role. 7. When the lithium battery circuit board is located on the side of the battery cell, try to put the B- terminal close to the B- of the battery core to avoid excessively long negative nickel strips and cause a lot of unnecessary trouble. With the improvement of people’s quality of life, the requirements for the shape and performance of various battery-related products are getting higher and higher, so now many lithium battery PACK manufacturers are doing some customized services. In recent years, some customized PACK lithium battery pack services and PACK lithium The customization of battery packs is becoming more and more popular. At present, Pride, Xinwanda, Desai Battery, Beijing Aisikai, Shanghai Jiexin, Oppenbach, etc. have done more influential in the PACK field.