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Blog - BMS Systems
FAQ: Balancing, overcharging and over heating of the CBU modules
FAQ: Balancing, overcharging and over heating of the CBU modules
Question: I have the RT-BMS installed on 16 cells. It seems to work OK. Only the balancing does not seem to be working properly. The voltage on some of the cells goes up to 4.00V and the CBU does not seem to control this. The BMS will switch off the charger for some time, but the cells are not fully charged.
Answer: Please note that the balancing current of the CBU is maximal 5A for the standard version and maximal 10A for the continues to grow, it will signal the full stop of charging (BMS pin B5 – Charging MAIN). The charging current needs to be reduced bellow the balancing currents of the CBUs to allow for the balancing of the cells without voltage increase.
Keep in mind that the long time balancing is not good for the operation of the cells. Check individually before assembling the pack.
The balancing current of the CBUs (5A or 10A) is reached only when proper cooling of the CBUs is provided. If the cooling of the CBUs is poor, the balancing currents will be reduced automatically to avoid over heating.
Question: The RED color LED on the CBU module is blinking during the final stage of the charging. What does it mean?
Answer: The red color LED signals that the CBU is overheating. You need to improve the cooling of the CBU to allow for the CBU to cool-down to allow the release of the heat. See also here.
