SOC/SOH IC for 23S and 32S LFP battery with 250Amps of current

Deepak Bansal1

Other Parts Discussed in Thread: BQ34Z100, BQ34110, BQ34Z100-G1

Hi,

1. Can you suggest suitable IC for 23S and 32S LFP battery with 250AMps of current discharge and 40A of charge current for SOC/SOH ?

2. I saw bq34100 and bq34z100 , I think bq34100 suits ?

3. Also any automotive grade IC which has SOC/SOH algo inbulit?

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello Deepak,

The best option we have is either the BQ34z100-G1 or BQ34110. If your application is rarely discharged the BQ34110 may be the better option.

You're going to need to scale both the current and voltage most likely to keep the coulomb counter and voltage sense in the gauges operating conditions.

Sincerely,

Wyatt Keller

0 Deepak Bansal1 over 4 years ago in reply to Wyatt Keller

Intellectual 300 points

Hi Wyatt

Our battery will be daily charged and discharged.

But I heard that CEDV algo is better suited for LFP battery than impedence track algo? Is is true?

For 23S application, daily high current charge(40A) and discharge(250A), LFP battery which one you suggest bq34z100 or bq34100?
Our single cell is 3.2V/86Ah LFP

0 Deepak Bansal1 over 4 years ago in reply to Deepak Bansal1

Intellectual 300 points

Here it says: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/987422/bq40z50-problem-with-obtaining-qmax-update-with-lfp_relax-bit-enabled---lifepo4-lfp-battery/3654755?tisearch=e2e-sitesearch&keymatch=cedv%252520lfp#3654755

" This device is CEDV algorithm based and typically works better for LFP chemistries."

0 Wyatt Keller over 4 years ago in reply to Deepak Bansal1

TI__Guru** 105590 points

Hello Deepak,

Yes for LFP batteries the Impedance Track algorithm has a harder time correlating the voltage to SOC value, CEDV relies more on the coulomb counting ability.

Sincerely,

Wyatt Keller

Power management

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SOC/SOH IC for 23S and 32S LFP battery with 250Amps of current