Hi everyone,

I'm a recent graduate and I have a question about using the BQ40Z50-R2 IC (Data sheet URL: https://www.ti.com/lit/ds/symlink/b...tps%3A%2F%2Fwww.ti.com%2Fproduct%2FBQ40Z50-R2) for managing a Li-Ion battery pack. Upon reviewing the data sheet, I noticed there are two pins designated for charger and discharger MOSFETs to control battery charge.

My question is: Does the BQ40Z50-R2 serve as both the Battery Management System (BMS) and the charger for the Li-Ion battery pack, or do I need an additional charger IC in conjunction with the BMS?

Any insights or advice on using this IC for battery charging would be greatly appreciated.

Thank you!

 

Welcome to AAC.

I've not used this specific chip, but its not dissimilar to others in TI's armoury of BMS devices.

The MOSFETs you refer to provide for a range of protection in both charge and discharge modes, but do not directly control the charge process, which requires an external constant current followed by a constant voltage sequence.

If you haven't already, I suggest you read the Technical Reference manual which gives more detail than the data sheet.

The chip provides feedback to the broader system on ideal charging voltage and/or current as determined by one of the onboard advanced charging algorithms but you have to provide the actual charger elements. Alternately you can use an off-the-shelf charger and leave it to that to do the balancing and use this chip purely for gas gauge and discharge protection.

Again, read all the provided TI documentation to understand how to use this complex device.