Multi-Cell Battery Monitoring ICs

Karthik,

Check out the bq27000 (which uses HDQ) and the bq27200 (same thing, but uses I2C). They can be used with multiple cells in series, as described in slua387 (http://www.ti.com/litv/pdf/slua387). I would also read slua367 (http://www.ti.com/litv/pdf/slua367), which talks about using these gauges with primary cells.

Let me know if these will work for you, otherwise we will try to come up with a different solution. In that case, please let me know more about your application and requirements of the monitor.

Regards,

Jason

Jason,

Can I monitor each cell individually with that? That is what I am looking for.

Regards,

Karthik

I apologize. No, unfortunately we don't have a solution for multiple series primary cells that can monitor individual cells.

Regards,

Jason

Thanks for the information. Do you have any ICs through which I can measure the voltage of a battery stack?  The application report at http://www.ti.com/lit/an/slua387/slua387.pdf uses a voltage divider and an opamp in addition to the IC. For your information we are using two LiSoCl2 cells each at 7.2V in series. I would like to know if we can measure the voltage across a stack of 4 cells (7.2V each) with a single IC (without using opamps and potential dividers).

Regards,

Karthik

We are using 4 cells in series. 3.6V each. The total voltage is 14.4V. Sorry for the wrong information in the previous post.

Regards,

Karthik

The only devices we have that are for use with primary cells are for single cell applications, and therefore they require voltage dividers to monitor voltages larger than ~4.5V.

Regards,

Jason

Jason,

Thank you very much for the information.

Regards,

Karthik

Hello Jason,

Can we use bq27000 with LiSOCl2 chemistry? If not are there any battery monitoring ICs compatible with LiSOCl2?

Regards,

Karthik 

Yes, you can use the bq27000 with LiSOCl2 primary cells. It is difficult to achieve as accurate gauging with primary cells as we can with Lithium cells, since primary cells' OCV curve actually rises and falls over discharge, but there are several monitoring methods in that app note I referred you to earlier (slua367) that can get pretty good results.

Regards,

Jason