BQ34Z100-R2: State of charge monitoring during charge and discharge of a 6-cell series NiMH battery

?? ??

Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ34Z100, BQ34110

Tool/software:

Hello,

I am looking for an IC to monitor the SOC (State of Charge) during the charge and discharge of a 6-cell series NiMH battery. Currently, I am considering the BQ34Z100-R2 as a candidate.
I would like to confirm whether the BQ34Z100-R2 meets the following requirements, and if there are any other ICs that might be optimal as alternatives.

The requirements are as follows:

A device that supports a 6-cell series NiMH battery configuration.
A device that can detect the fully charged timing using the ΔT/Δt method.
In other words, a device that can accept thermistor input from the battery.
Alternatively, a device that uses a method to detect full charge even with low current charging would be acceptable.
A device that can calculate the SOC by considering the impact of temperature changes on discharge characteristics.

Thank you for your time.

Adachi

3 months ago

0 Alan Frias 3 months ago

TI__Mastermind 25075 points

Hello,

?? ?? said:
A device that supports a 6-cell series NiMH battery configuration.

-Yes BQ34z100-R2 is able to support a 6 cell NiMH cell chemistry

?? ?? said:
a device that can accept thermistor input from the battery.

-It does have a thermistor input

?? ?? said:
a device that uses a method to detect full charge even with low current charging would be acceptable.

?? ?? said:
A device that can calculate the SOC by considering the impact of temperature changes on discharge characteristics.

-Yes BQ34z100 uses TI algorithm called Impedance tracking that use coulomb counting, simulation and etc to know when the SOC is at 100% or when full charge capaity is reached. Please reference section "6 Impedance Track" to better understand the algorithm.

Battery Gauging Algorithm Comparison:
https://www.ti.com/lit/an/sluaar3/sluaar3.pdf?ts=1747238718639&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FBQ27Z746

Thank you,
Alan

0 ?? ?? 3 months ago in reply to Alan Frias

Prodigy 30 points

Thank you for your response.

I'm relieved to hear that the BQ34Z100-R2 meets the requirements.

I’m also curious if there might be any other potential IC candidates.
If you know of any fuel gauge ICs using the CEDV algorithm that support a 6-cell NiMH battery configuration in series, I would appreciate it if you could let me know.

Thank you for your time.

+1 Alan Frias 3 months ago in reply to ?? ??

TI__Mastermind 25075 points

Hello,

The only other battery gauge that would be workable within your battery pack is BQ34110.

Thank you,
Alan

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BQ34Z100-R2: State of charge monitoring during charge and discharge of a 6-cell series NiMH battery