Part Number: BQ78350-R2-DEVICE-FW
Hello,
We have designed a BMS + battery pack based on TIDA-00792.
I've found a battery pack that was discharged until CUV=3V condition, without charging it later. After 1-2 months this battery pack has been self-discharged finding some cells at 2,8V.
Precharge FET feature is enabled having set "Precharge Start Voltage = 2950 mV" and "Charging Voltage Low = 3000mV".
Moreover, I have enabled "Shutdown Voltage = 3000 mV" + "Shutdown Time = 255 s".
Under this condition (some cells at 2,8V) when I wake up the BMS through TS1, the Shutdown Time is succesfully accoplished.
But when I start charging through the precharge FET which limits the charging current to 30-25mA, I expect that BMS skip Shutdown condtion since it's in Precharge state.
The result: It still enters in Shutdown mode even if the BMS is in precharge state.
Enclosed you can find the data graph of this test and the log file.
Could you tell me how we can avoid entering in Shutdown under this precharge condition?