Hello, I need assistant in the TI component BQ76592EVM evaluation board. The charge and discharge current of this evaluation module is 6A. While we are designing system for solar based battery management system. It could be support between 80-100A of current for both charge and discharge. Now which part can we modify in the current EVM schematics available on texas website (BQ76952 data sheet, product information and support | TI.com) . Please understand my issue and respond us with good solution.
Welcome to the DigiKey TechForum appleyounas.
I’m not an engineer, but I don’t think changing 1 or 2 parts in a redesign would do the trick.
Hopefully one of the engineers can add to this post, and hopefully point out the circuits that would need to be changed.
Hello appleyounas,
Welcome to the DigiKey forum.
As I understand your question, you are inquiring about the BQ7652EVM evaluation board. Specifically, how to modify the board to transition from 6 A to a 100 A.
One way to modify this board is to form a series connected battery string using heavy gauge wire. This wire would be independent of the BQ7652EV. To the ground (return) of this string you could add a precision shunt such as this:
Once this is done, you can then use thin gauge wire to connect the BQ7652EV to each cell using the connectors on the left side of the board. Finally, you would need to modify the PCB to include a voltage divider in place of the R30 such that your desired full-scale voltage, as read across the external shunt, is within the capacity of the BQ76952PFBT multi-function controller. Note that the software may not read the current correctly. It will be linear but not properly scaled.
Let’s conclude with a word of caution. The BQ7652EVM is a monitoring system. This is an important component of a larger Battery Management System (BMS). However, it no way is it complete. You will need to add appropriate cell balancing / equalization circuitry to prevent cell destruction or the potential for fire.
Please let us know if you have any additional questions. Also, please share your results. Pictures of your project are especially welcome.
Best Wishes,
APDahlen
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