BQ24650: Battery Management Solution for Small home appliances

Furkan Fehmi Sefiloglu

Part Number: BQ24650
Other Parts Discussed in Thread: BQ77915, TIDA-050042

Hi Team,

This is customer request can you please advise with which combination you recommend:

We aim to design a charging circuit with a lithium-ion battery.
We can use 6 or 7 serial 18650 2000-2500 mah batteries in total. Accordingly, we should design a charging circuit that includes current protection and balancing features. During charging, the cell is usually charged with 30-35% of its current. The charging circuit must be able to meet this current. We need to provide a charge current up to max 1A.

Our initial idea is BQ77915 + BQ24650, what do you think?

Thanks in advance

Best Regards

Furkan Sefiloglu

over 4 years ago

0 Ricardo over 4 years ago

TI__Genius 10385 points

Furkan,

The BQ24650 would work for a 6S application but not for 7S.The reason for this is that the input voltage limit is 28V max. The 1A charge current should be no problem as long as your adapter can support the input power required.

I am looping in the appropriate team to comment on the BQ77915.

Best Regards,

Ricardo

0 Furkan Fehmi Sefiloglu over 4 years ago in reply to Ricardo

TI__Expert 3118 points

Hi Team,

Can you please advise if we integrate following reference design on this project:

https://www.ti.com/lit/ug/tiduex6/tiduex6.pdf?ts=1609837722163&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-050042

As i see this design has wide input voltage range support: 4 V to 30 V (1-s to 6-s li-ion battery-charger solution)

And the design enables a stable and smooth precharging to constant-current (CC) and constant-voltage (CV) charging profile and has been evaluated with a 4S2P li-ion battery pack.

Do you think we can combining here BQ77915 with TIDA-050042 would be good combination for 6s?

Thanks in advance

Best Regards

Furkan Sefiloglu

0 Ricardo over 4 years ago in reply to Furkan Fehmi Sefiloglu

TI__Genius 10385 points

Furkan,

BQ24650 would be good to meet the application in the TIDA document and provide higher integration and a reduced BOM.

The Precharging/CC/CV profile is handled by the charge controller autonomously. This is described in Figure 9. Typical Charging Profile.

Best Regards,

Ricardo

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BQ24650: Battery Management Solution for Small home appliances