How important is cell consistency for battery modules!
Release time:2026-01-16
Due to the differences in voltage, capacity, charge capacity, internal resistance, discharge plateau, and constant current ratio among the individual cells, the charging and discharging rates of the battery module composed of individual cells cannot be synchronized and consistent during charging and discharging, which will shorten the service life of the entire battery module.
Therefore, separate capacity treatment must be carried out to make the single battery of the same module have the same voltage; Consistent cycle life; Consistent capacity; Consistent self discharge; Consistent electrical charge; Consistent internal resistance; Consistent discharge platform; Consistent constant current ratio.
Consistent voltage:
① Inconsistent voltage in series circuits can cause overcharging and overdischarging, and the manager cannot control the battery system;
② The parallel circuit voltage is not consistent, and the batteries are charged and discharged evenly between each other until the voltage is consistent. But if the pressure difference between them is too large, the fuse (PCB board structure) will be blown, and the fuse is allowed to have a pressure difference of less than 0.6V;
③ If there is a large pressure difference between the series modules, it can only be resolved through active balancing by BMS. In severe cases, manual charging and discharging or removal of faulty batteries by after-sales service is required.
2. Consistent capacity:
Inconsistent capacity is the main cause of voltage inconsistency, and there is a risk of overcharging and overdischarging during the charging and discharging process.
3. Consistent electrical charge:
Even if the battery capacity is the same, if the charged amount is not the same, it can still cause overcharging and overdischarging phenomena.
4. Consistent internal resistance:
Each individual physical battery can theoretically be divided into two parts: a pure battery and an internal resistance, and inconsistent internal resistance will cause asynchronous charging and discharging of the pure battery.
