• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 442 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76952: BQ76952 IC based Stacking solution

Govinda Giri
Prodigy 95 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ79616-Q1

Hi Expert,

We are having our existing BMS-15S based on TI's BQ7695202. We further want to stack these BMS in 3x3 matrix to make a 144V pack .
i.e.- 3 BMS in series to form a set and a total of 3 such sets in parallel.

Kindly help us to achieve this feat. with existing IC.

Regards
Govinda

  • 0
    TI__Guru* 81035 points

    Hi Govinda,

    This can get very complex if each of the battery monitors is controlling protection FETs - I am not sure how you want to handle this in parallel. We do not have any examples of a 3x3 matrix. For stacking more than 2 devices, we generally recommend looking at the BQ79616-Q1 which is designed to be stacked with daisy chain communications.

    Regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 95 points

    Hi Matt,

    As I mentioned earlier that we are having 15S BMS with the capacity of 100Ah, We would like to have 45S with 300 AH and for that we need to connect 3-BMS in series and then three such 45S in parallel to make 45S and 300 AH.

    On the E2E forum itself there are many users who already developed their BMS using the IC with daisy chain communication. But mostly in series only(not in parallel). Hencd before further development just want to be sure if daisy chain communication will be able to provide data of all the individual BMS connected in series as well as in parallel, Kindly also enlighten me how can we (connection-wise) able to do that.

    Best Regards,
    Govinda

  • 0 in reply to Govinda Giri
    TI__Guru* 81035 points

    Hi Govinda,

    It is not common to use monitors in parallel, but normally battery cells are used in parallel with a single battery monitor. We do not have a recommended topology for using parallel modules together. Modules in parallel will charge each other if they are at different voltages. If this behavior is undesired, you will need to come up with a plan to control the FETs to only allow parallel packs to connect when they are at the same voltage.

    Sorry I cannot provide further help. Why do you want separate battery monitors for each parallel pack?

    Regards,

    Matt