BQ34Z100-R2: Capacity algorithm for impedance tracking

lifang.hu

Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ34Z100

Hello, everyone.

From the 2.2.3 chapter of ZHCAAF7.pdf (https://www.ti.com.cn/cn/lit/an/zhcaaf7/zhcaaf7.pdf?ts=1693295069617&ref_url=https%253A%252F%252Fwww.ti.com.cn%252Ftool%252Fcn%252FBQSTUDIO)，

Chemical ID matching is mainly used for OCV matching. Capacity and impedance will be learned through Golden Learning.

We know, the approximate capacity can be calculated from the Coulomb integral and the OCV.

So, I have the following questions about capacity calculation.
1. Can capacity be calculated if impedance tracking is not turned on or Golden Learning is not performed?

2. If so, is the capacity calculated only in terms of Coulomb integrals and OCV?

over 2 years ago

0 Shirish over 2 years ago

TI__Guru 57697 points

BQ34Z100 will not compute capacity if Impedance track is not turned on and golden learning not performed

The capacity calculations are complex and include use of coulomb integration and OCV

0 lifang.hu over 2 years ago in reply to Shirish

Prodigy 40 points

Hello Shirish. Thank you for your reply.

If after golden learning, we have turned on impedance tracking. But if I change the battery frequently and the model stays the same, BQ34Z100 detects a voltage mutation and impedance change. In this case, can the capacity re-learn on its own and work properly?

+1 Shirish over 2 years ago in reply to lifang.hu

TI__Guru 57697 points

Hello Lifang,

bq34z100 can only store 1 battery profile. The same battery must be connected during multiple cycles, otherwise the accuracy will suffer even if the batteries aer of the same model.

0 lifang.hu over 2 years ago in reply to Shirish

Prodigy 40 points

OK，Shirish. Thank you so much. I have no further questions.

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BQ34Z100-R2: Capacity algorithm for impedance tracking