Home » Questions » Will BMS limit the battery charging voltage if the charge controller’s voltage limit is too high?

Will BMS limit the battery charging voltage if the charge controller’s voltage limit is too high?

I have 16 LiFePO4 batteries and a charge controller, but I am concerned that the Settings of the charge controller may not work with the LiFePO4 batteries. If the upper limit of the voltage set by the charging controller is too high, will the LiFePO4 battery be overcharged? Because the LiFePO4 battery has specific safety limits on the charging voltage. I wonder if the BMS will play a protective role and limit the voltage at which the battery can be charged to avoid potential hazards or damage even if the charging controller is not set correctly.

Battery Management System
October 10, 2023

Yes. The battery charging voltage will be limited by BMS to some extent, although this may not be the optimal approach.

The battery management system is a safety system, but it should not be relied on to be used as the primary regulating device. It can stop charging when it reaches its maximum voltage. If the voltage cap of the charger is set high, this may cause voltage fluctuations in the rest of the system, and this is not the best way to limit the battery voltage.
I recommend that you charge each cell to 3.45V for 1 to 2 hours to give the BMS a chance to balance the voltage differences between the cells. If the charging time exceeds this range, the voltage of some battery cells can rise above 3.65V, causing the BMS to cut off the battery to prevent overcharging.
Alternatively, you can buy a charge controller designed for lithium iron phosphate (LiFePO4) batteries, which ensures safe charging and reduces the risk of expensive batteries and devices.

MORE: Can the BMS slave board conduct separate current and voltage sampling for each cell?

Jessica Liu

Jessica Liu is an engineer at MOKOEnergy with expertise in IoT devices, MCU, VCU, inverter, and BMS. She has a degree in automation, 6 years of work experience, and several certifications in project management.

Jessica Liu

What Others Are Asking

What key factors should be considered when designing an electric car BMS?

What key factors should I consider when designing an electric car BMS to ensure optimal performace and driver safety?

Jessica Liu January 22, 2024

How to test a BMS fault with a multimeter?

I want to test whether is my BMS fault or not and now I have a multimeter. Can you tell me how to test it with a multimeter? And please tell me what I should pay attention to during the testing process.

Jessica Liu January 22, 2024