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Cell balancing by TIDA-00449 archecture

liao jim
Prodigy 40 points
Other Parts Discussed in Thread: TIDA-00449

Hi expert,

I have a cell balancing questions about TIDA-00449 implementing.

In the chapter "4.2.6.3.3     How is it Implemented in the TIDA-00449"

There are two check points when to do cell balancing

• At the end of charge when the cells reach 4 V or higher
• When the pack is in idle for longer than 30 minutes and the cell voltage is higher than 3.3 V

Q: We can not find the below check points in simple_charging_balancing() and simple_idle_balancing().

Do you suggest to implement it?

thanks

 

  • 0
    TI__Guru 54715 points
    Hi Liao,
    I can't say how the authors structured the example code or where they located the checks they describe. Hopefully you can find it a useful reference.
    How and when you choose to balance in your product is up to you, and you may want to consult with your cell supplier. Since the balancing mechanism is dissipative it is common only to balance while charging and since charge current can alter the observed cell voltage to balance when the charge current is low. Low charge current may not give much time for balancing, so you may want to balance at idle for a longer balance time. Typically the cell voltages might be matched at the top of the voltage range so that no cell is stressed at full charge. So if the cells balance at idle at 4.1V, they may still be well matched when charged after a discharge and the system may not benefit from balancing again at 3.5V. Select a method which is good for your cells and system usage model.