Do you know the consistency of the lithium battery sorting machine?

The consistency of lithium batteries, as we see it right now, refers to the convergence of a set of critical characteristic parameters of lithium batteries. It is a relative concept. There is no consistency, as long as it is more consistent. For multiple strings of cells in the same battery pack, each parameter should preferably be within a small range for good consistency. Adding the time dimension, consistency refers to the consistency of all the characteristic parameters of all the cells in the battery pack throughout the life cycle, adding that the inconsistency of capacity attenuation, the inconsistency of internal resistance rise, and the inconsistency of aging rate are considered. The life span of the entire battery pack is our ultimate focus on consistency. According to the passage of time, some scholars put the mutual use of parameters on a picture. Time is the horizontal axis, and the parameter is the vertical axis. Several parameters follow the time change and put them in a table and cross them into a net, which is the starting point for us to consider consistency. In pursuit of consistency, in addition to exerting the maximum ability of the battery pack (including maximum power, maximum current, and maximum usable capacity) in the current state, it also wants to maintain this ability for as long as possible. In what range does the lithium battery sorting machine comment on the consistency, I personally understand that consistency is the consistency of all the batteries used as power on an electric vehicle, regardless of whether it is connected in series or in parallel. The following content does not make a comprehensive comment, just an example. A straight example of parallel connection. The battery cell with low discharge capability (code B) is connected in parallel with other normal batteries to become a parallel module D. For example, this is a module with 10 batteries in parallel. When the system is discharged, each parallel module must supply the same current, for example, 100A. For other normal parallel modules, each battery discharges 10A; B can only discharge a maximum current of 1A, while the other 9 batteries only discharge 11A each. Under normal circumstances, long-term overload, compared with other parallel modules, the aging rate of these batteries is faster. One day, the overall maximum discharge capacity of this parallel module cannot reach the maximum capacity of the design. This parallel battery pack has become a bottleneck for the discharge capability of the entire battery pack. The series connection is in accordance with the general scene on electric vehicles, and the series connection is important between the module and the module. Continuing the scenario of the previous parallel connection, the entire battery pack presents a battery pack D with a deeper aging degree than other battery packs. The capacity of D is small, but the internal resistance is large. Reflected on the curve of SOC and open circuit voltage, the open circuit voltage corresponding to the same SOC, the D terminal voltage is relatively high. When the entire battery pack is charged, D reaches the charging cut-off voltage at the earliest, and the battery pack stops charging. The other modules have not eaten enough yet, and he is about to break his belly because it is old and its appetite has become smaller. Therefore, the consistency of the monomers is not a matter of the inside of a certain welded module, but a requirement for all power lithium-ion batteries in the same car. 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: Common charging methods and storage analysis of lithium batteries