TIDA-00792: BQ78350+BQ76930+BQ76200 BMS design (TIDA-00792) Current Consumption Issue

Part Number: TIDA-00792

Tool/software:

Hello TI Team,

I previously reported an issue through the following link:
https://e2e.ti.com/support/tools/simulation-hardware-system-design-tools-group/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1325452/tida-00792-bq78350-bq76930-bq76200-bms-design-tida-00792-current-consumption-issue

As mentioned there, I have been facing a high current consumption problem for almost two years without a proper resolution. The battery consumption remains at a very high level.

To mitigate this, I recently developed a new approach: placing the device into shutdown mode when it is not in use, and re-enabling it before operation. With this method, I managed to reduce the device current consumption to around 10 µA, which is a significant improvement.

However, I am facing a new problem:
When entering shutdown mode, my calibrated SOC value is 68%, but after re-enabling the device, the SOC value jumps to 71%.

Could you please clarify why this shift occurs? How does TI define or calculate the initial capacity value after shutdown?

Additionally, I would highly appreciate your technical guidance on possible methods to further reduce the current consumption in this design.

Regards,

Hasan Bilir