Passive cell balancing
- Thread starter Jonndeka
- Start date
lnanek
1 kW
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- Sep 26, 2022
- Messages
- 453
For e-bikes, yes, passive balancing generally entails dumping energy from any cells that reach maximum voltage first into resistors to allow the remaining cells to finish charging all the way.
For EVs the situation is more complex where they track statistical information about all the cells and voltages, best done when neither charging nor discharging. So an EV BMS may elect not to passively balance if it doesn't have the data and just terminate charge early. They often lie and say they are at 100% at this point to not worry the customer, though. Customer will just receive reduced range until the balancing actually takes place and all cells are completely charged.
For EVs the situation is more complex where they track statistical information about all the cells and voltages, best done when neither charging nor discharging. So an EV BMS may elect not to passively balance if it doesn't have the data and just terminate charge early. They often lie and say they are at 100% at this point to not worry the customer, though. Customer will just receive reduced range until the balancing actually takes place and all cells are completely charged.
