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What tests do 18650 lithium ion battery packs go through before?

by:Vglory      2021-04-23
18650 lithium-ion batteries need to be screened before the PACK. Different customers have completely different requirements for the cells before the 18650 lithium-ion battery PACK. Because the 18650 lithium-ion power battery has a high degree of automation, stability and replaceability High, it can effectively reduce processing costs and save labor, making the 18650 battery have unparalleled magical advantages in the modularization and standardization of system development. However, everything has its two-sidedness, and the coexistence of pros and cons is the normal state of things. In addition to the above-mentioned advantages before the 18650 lithium-ion battery PACK, its disadvantages cannot be ignored. The biggest drawback of 18650 lithium-ion batteries at present is that their single battery capacity is low, generally around 2~4Ah. Therefore, the number of batteries required for electric vehicles is very large. For example, Tesla needs 7000-8000 18650. Lithium-ion batteries are reliably connected into modules. Therefore, with such a large number of batteries, the requirements for battery management consistency are higher. In the field of multiple series and parallel such as electric vehicles, the inconsistency of the battery affects the performance of the battery, and even brings some safety risks. There are many reasons for the inconsistency of the 18650 lithium-ion battery before the PACK. The materials that make up the battery are not completely consistent, and the process of manufacturing the battery cannot be controlled to be the same in every detail. This will lead to inconsistent capacity, inconsistent terminal voltage, inconsistent internal resistance, inconsistent life, etc. In addition to the electrical performance that needs to be screened, the appearance of the 18650 lithium-ion battery also needs to be tested. For example, defects such as scratches, breakages, stains, pits, and bumps on the surface of the battery will affect the assembly of the battery module and the safety characteristics of the group. Therefore, the appearance test before the PACK of 18650 lithium ion battery is also a very necessary link before the PACK process. The battery equipment sorting before 18650 lithium ion battery pack can be used for automatic test and sorting of battery cell voltage and internal resistance. The detailed functions are: 1. Perform consistency test on all incoming batteries, and use technical means to ensure the consistency and quality of all batteries. 2. The test information of all batteries is matched to the bar code of each battery in the cloud, so that the test information of each battery can be traced back; after the test, the batteries are classified and unqualified batteries are eliminated. At present, the focus of application enterprises on the sorting machine is the sorting rate, and the general problem of the domestic sorting machine is the low rate. 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: A comprehensive overview of 18650 lithium-ion battery knowledge?
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