Explain the importance of the inspection process before the 18650 cylindrical battery cell PACK

The importance of the inspection procedure before assembly of the 18650 cylindrical battery Due to the high degree of automation, stability, and high replaceability of the 18650 lithium-ion power lithium-ion battery processing, the 18650 battery has unique advantages in the modularization and standardization of system development. It can effectively reduce processing costs and save labor. In addition to the old brand Tesla, currently including Porsche and domestic JAC, Zotye, Changan, etc., GAC has also joined the 18650 battery model research and development team. Industry insiders said that in the future, more models will fall in love with 18650 batteries, driving the use of 18650 batteries to undergo disruptive changes. However, everything has two sides, pros and cons are the norm. In addition to the above advantages, the disadvantages of the 18650 battery cannot be ignored. At present, the biggest disadvantage of the 18650 battery is the low capacity of a single battery, generally around 2~4Ah. Therefore, the entire electric vehicle requires a large number of batteries. For example, Tesla needs 7000-8000 18650 batteries to be reliably connected to the module. With so many batteries, battery management is more complicated and consistent. In the field of multiple series and parallel connections such as electric vehicles, battery inconsistency affects battery performance and may even bring safety hazards. Lithium batteries are used alone or in small series and parallel, and their safety problems are basically controlled. However, due to the quality organization of lithium batteries, especially as the power source of electric vehicles, their safety problems are more prominent. Lithium batteries and groups, because of the number of monomers and the complex structure, It is more difficult to match the consistency and consistency management of the single filter, which makes the short-board battery of the battery pack prone to excessive aging, which is more prone to safety accidents during use. Therefore, it is very necessary and urgent to solve the safety problem of lithium batteries. While improving the safety of single cells, it is also very necessary and urgent to strengthen the safety technology of lithium batteries from the perspective of the battery system. Inconsistencies can come from multiple sources. The materials that make up the battery itself are not exactly the same, and the process of manufacturing the battery cannot be controlled, so every battery is the same in every detail. This will lead to inconsistencies in capacity, terminal voltage, internal resistance, and life span. It is difficult to find the source of the problem. Before grouping, it is necessary to detect and filter the cells. In addition to the electrical performance to be screened, the appearance of the 18650 battery should also be tested. For example, detecting defects such as scratches, damages, stains, pits, and bumps on the surface of the battery will affect the assembly and safety characteristics of the battery module. Blob. PNG For example, if the plastic coating damages the surface of the battery, there will be a short-circuit safety hazard; Blob. Smudges, pits/bumps, etc. on the PNG end face will also affect the soldering stability of the circuit; The flatness of the PNG package also affects the assembly efficiency of the module. Blob. In addition, the consistency of battery length and end diameter will also affect the processing efficiency of module assembly. Therefore, visual inspection is also a very necessary link that cannot be ignored before packaging. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Lithium battery recycling technology and current situation