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BQ34Z100-G1: Charger and Load for Learning Cycle

user5631260
Prodigy 40 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ40Z80

Hello everyone,

I am completely new to battery technology so please excuse me if the questions seems broad.

I want to build a device that sets the SOC of a 2s1p LiIon battery to a certain percentage range. Using the BQ34/100-G1 for gauging I am wondering what the easiest charger/load set up would be. 

Discharge:

A programmable electronic load seems to be optimal but is quite expensive for my budget. I am guessing a resistor would not be stable enough especially for the learning cycle. Are there any common alternatives?

Charge:

A DC Power Supply seems to be the common choice for charging during the learning cycle. Would you recommend a TI charger circuit over the DC power supply for the learning cycle?

For somebody new in the field the universal battery charge/discharge devices seem like the best choice but reading through the forum I never came across an application using those. Why is that?

Thank you very much!

  • 0
    TI__Guru* 81034 points
    Hi,

    Programmable electronic loads can be a bit expensive. However, the important thing for your learning cycle is to reach the high and low battery voltages in order to cover at least 90% of the battery range. You can reference the new bq40z80 Learning Cycle application note for a deeper description of the learning cycle process: www.ti.com/.../slua848.pdf. For this purpose, you should be okay to use a resistor with a high enough power rating to do the discharge.

    I have not tried one of these yet myself, but it looks like there are some good cheap alternative electronics loads available that even do data logging. www.youtube.com/watch

    For the charging method, you can either use a TI charger or a power supply.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Prodigy 40 points
    Thanks a lot Matt for the quick answer!