BQ76952: Cascadable BMS design IC

Batuhan Yavasoglu

Part Number: BQ76952
Other Parts Discussed in Thread: BQ79718-Q1, BQ79616, BQ79616-Q1, , BQ76PL455A-Q1

Dear Ti experts,

I want to design a BMS that has distributed topology and my battery modules will have 52 cells series, but it can be change up to 70 cells, so it should be able to cascadable. I think I need daisy chain interface. The battery pack has LiFePO4 chemistry. I am looking for suitable BMS IC that can monitor and protect every single cell. I am starting my design from Cell supervision unit.

List of possible devices I search:

BQ7695201PFBR

BQ79718-Q1
BQ7694000DBT
BQ7695201PFBR
BQ7694203PFBR
BQ7694204PFBR
BQ25505RGRR
BQ7694006DBT
BQ7694006DBT
BQ7694003DBTR

Cells operating voltage: low2,5 / nominal 3,2 / high 3,65

Every module has nominal 166 volt.

Current we need to take from module is unclear right now.

Can you help me coosing right IC? I am open for any succestions and applications.

Thanks & Regards,

Batuhan Yavasoglu

over 2 years ago

+1 Andria McIntyre over 2 years ago

TI__Expert 8526 points

Hi Batuhan,

TI's industrial battery monitors would not be the best choice for your application. I recommend considering the BQ79616, which is an automotive device that can be stacked to accommodate all the battery modules in your system.

I will attach a link to the product page here: BQ79616-Q1 data sheet, product information and support | TI.com

Best,

Andria

0 Batuhan Yavasoglu over 2 years ago in reply to Andria McIntyre

Prodigy 220 points

Hi Andria,

Unfortunately BQ79616-Q1 is out of stock right now.

Can I ask you what is different in this IC over others? Is there any similar?

Best

Batuhan

0 Andria McIntyre over 2 years ago in reply to Batuhan Yavasoglu

TI__Expert 8526 points

Hi Batuhan,

The BQ79616 is better for high voltage applications. The BQ76952 is not intended to be used in systems with more than 32S cells. The BQ79616 is better for the system you are describing due to its daisy chain capabilities. It should easily be able to accommodate 70S cells. The BQ79616 also has better cell voltage measurement accuracy and more redundancy/ safety features.

I am sorry to hear about the availability of the part right now. If you would like, I can put you in touch with someone from our marketing department to see if you have any other options that match your project timeline.

Best,

Andria

0 Batuhan Yavasoglu over 2 years ago in reply to Batuhan Yavasoglu

Prodigy 220 points

BQ79656-Q1 and BQ75614-Q1 looks similar but they are also out of stocks

0 Batuhan Yavasoglu over 2 years ago in reply to Andria McIntyre

Prodigy 220 points

I would be very happy for that. Please put me in touch thank you

0 Andria McIntyre over 2 years ago in reply to Batuhan Yavasoglu

TI__Expert 8526 points

Hi Batuhan,

Yes, the 656 is the same as the 616, but it has current sense capabilities, and the 614 is the same as the 616, but it can accommodate 14S cells instead of 16S. I will contact someone in marketing for you, as I do not have information on part availability.

Best,

Andria

0 Andria McIntyre over 2 years ago in reply to Batuhan Yavasoglu

TI__Expert 8526 points

Hi Batuhan,

Great, I will private message you.

Best,

Andria

0 Batuhan Yavasoglu over 2 years ago in reply to Andria McIntyre

Prodigy 220 points

Hi Andria

Thank you for your recommendation for the BQ79616-Q1 device for my application. I also wanted to ask about the BQ76PL455A-Q1 device since I have found that it is currently in stock. Could you please let me know if this device would be a suitable option for my application as well? Is there a missing side of the product that I can't see?

Thank you for your time and expertise.

Best,

Batuhan

0 Andria McIntyre over 2 years ago in reply to Batuhan Yavasoglu

TI__Expert 8526 points

Hello Batuhan,

This device is an older device, and we generally recommend the BQ79616, not the BQ76PL455A-Q1. Since you are very interested in obtaining parts as soon as possible, you may be able to use the BQ76PL455A-Q1 in your system--but there will be considerations.

Please note that this part will not be as accurate as the 616, and it also will not be compatible with our newer range of devices, such as the BQ79600 and BQ79631. I recommend reading through the datasheets and deciding for yourself whether the part will function for your system, or if it is better to wait for the 616 to become available.

Best,

Andria

Power management

Power management forum

BQ76952: Cascadable BMS design IC

BQ79656-Q1 and BQ75614-Q1 looks similar but they are also out of stocks