Talking about the knowledge of lithium battery PACK

In the battery industry, engineers call batteries that are not assembled into batteries that can be used directly, and call the finished batteries that are connected to the PCM board and have charge and discharge control, BMS, and other functions as batteries. According to the shape of the core, we mainly divide it into square, cylindrical and soft cores. We mainly study the capacity, voltage, internal resistance and current of the battery. Before entering the packaging and assembly, we also check the size (including length, width and height) and appearance (whether it is oxidized or leaking) of the battery. The two most important components are the battery and the protection circuit board (also called the PCM board). The secondary lithium battery needs to be protected, because the lithium battery itself cannot be overcharged, overdischarged, overcurrent, short-circuited, and charged and discharged at ultra-high temperature. The processing of lithium-ion power lithium-ion batteries can be divided into three important processes: single cell production, module assembly and packaging assembly. Battery screening, that is, the capacity division after the battery ends. Through division (generally based on capacity, voltage, internal resistance), the characteristics of the battery are similar to the division in the first gear, and the thickness of the battery is detected. When the batteries are grouped, we always want the batteries to be consistent during use. After screening, the cells are coated with a plastic insulating film. Combining the data of the previous battery, according to the requirements of automobile manufacturers for PACKPACK, PACKPACK can meet the required power, capacity and voltage through series and parallel (new string voltage and new parallel capacity). The battery packs with the same battery characteristics are combined into a module, and then welded by CMT, the battery is installed in the module and fixed. Important process flow includes: matching group, plasma cleaning, battery stack, cooling plate assembly, insulation cover assembly, EOL test. Packaging and assembly is to put the module into the box, and assemble the bronze plate, wiring harness, etc. Important technological processes include BDU, BMS plug-in packaging, copper medal wiring harness assembly, electrical performance test, EOL test, air tightness test, etc. The current packaging is mainly in the hands of battery manufacturers and packaging manufacturers. After the battery manufacturer has processed the battery, the battery can be transported to the packaging workshop for assembly through the logistics line. Packaging manufacturers do not process their own batteries. Instead, they buy bare cells from battery companies, assemble the modules and pack them after dividing the capacity. In recent years, some auto companies have gradually entered the packaging trend. Just as no auto company does not want to control engine technology in their own hands, in order to facilitate data management, auto companies are also controlling packages in their own hands (some auto companies outsource parts and advanced Automated technology is used for purchase after assembly). The general process of battery factory packaging is that the whole factory requests and supplies the packaging volume, required power, battery life, voltage and test items. After receiving the customer's demand, the battery factory began to combine its own situation, or use the processed products, or develop new products, and establish a new factory. According to demand, the product development department develops corresponding modules and delivers samples for vehicle testing. After the samples are sent to the vehicle company for inspection, the battery manufacturer will continue to process the battery packaging modules as required. 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: Lithium battery SEI formation mechanism and the impact of SEI on lithium batteries