1) I connected the 7S 30A Smart BMS, purchased from https://www.aliexpress.com/item/32840764349.html?spm=a2g0s.9042311.0.0.27424c4dJ6rzZ9, to a large 7S10P 18650 Lithium battery pack. The soldering, wiring and balance connection are all fine, and the Smart BMS can charge & discharge the battery pack.
The consistency of the battery pack isn't good, before 1st time charging, the voltage of one parallel group is 3.56V and the voltage of all the rest 6 parallel groups is 3.61V. When charging the battery pack with the Smart BMS, the voltage increase of the 3.56V parallel group is slower than that of the 3.61V parallel groups, e.g. when the voltage of the 3.56V parallel group increase to 3.71V, the voltage of the 3.61V increase to 3.84V, but this shouldn't be an issue, and I used a very simple charger I modified to particularly charge this lower voltage parallel group separately to make its voltage closed to that of the other parallel groups, to resolve the voltage consistency issue.
I install the recommended Bluetooth Apps onto my Huawei Android 5.1 smart phone. When run the Apps, it shows "The device can be connected" and "signal:Strong-22" etc information on my mobile, but can't see the Apps software dashboard screens as those in the supplier's advertisement listing. The Bluetooth PCB board connecting to the BMS PCB board has no light flashing either when running the Apps from my mobile. When go to Bluetooth settings for pairing, it displays "Couldn't pair with xiaoxiang BMS because of an incorrect PIN or passkey" and the Bluetooth PCB board has blue light flashing simultaneously for about 10 seconds.
2) I tried this on my Android 5.0 tablet also, and got "Pairing rejected by xiaoxiang BMS" when try to pair it. When run the Apps on my tablet, got the same displays as that run from my Android 5.1 Huawei smart phone, which has strong signal.
I installed both the old and new versions of the Apps for this Smart BMS onto my smart phone and tablet, but the smart BMS software dashboard screens don't work in each scenario.
The wiring, soldering, balance connection are all good, the resistance of each parallel group of battery cells are very closed, within the consistency range also, and the battery pack can charge and discharge, just the Smart BMS mobile Apps doesn't work.
This is an UART module to communicate to PC, but I didn't order this one, only the Bluetooth module.
3) I cleared the xiaoxiang Smart BMS Apps cache, then run the Apps again, a screen with elephant image shows up for a very short period of time, less than half second, then disappeared and changed to the screen with "Refresh" and "Fix" buttons, and with strong signal indication. Unplug & replug the Bluetooth PCB board from & into the Smart BMS PCB board, then run the Apps, but the software dashboard screens still don't show up. Charged the lower voltage parallel group cells to the voltage almost the same as the voltage of the other parallel groups cells, then run the Apps again, but the software dashboard still doesn't show up. Done some other different testing, but the software still doesn't work.
It is much appreciated if anyone has experience with this kind of Lithium battery Smart BMS and happened to the similar problems.
The consistency of the battery pack isn't good, before 1st time charging, the voltage of one parallel group is 3.56V and the voltage of all the rest 6 parallel groups is 3.61V. When charging the battery pack with the Smart BMS, the voltage increase of the 3.56V parallel group is slower than that of the 3.61V parallel groups, e.g. when the voltage of the 3.56V parallel group increase to 3.71V, the voltage of the 3.61V increase to 3.84V, but this shouldn't be an issue, and I used a very simple charger I modified to particularly charge this lower voltage parallel group separately to make its voltage closed to that of the other parallel groups, to resolve the voltage consistency issue.
I install the recommended Bluetooth Apps onto my Huawei Android 5.1 smart phone. When run the Apps, it shows "The device can be connected" and "signal:Strong-22" etc information on my mobile, but can't see the Apps software dashboard screens as those in the supplier's advertisement listing. The Bluetooth PCB board connecting to the BMS PCB board has no light flashing either when running the Apps from my mobile. When go to Bluetooth settings for pairing, it displays "Couldn't pair with xiaoxiang BMS because of an incorrect PIN or passkey" and the Bluetooth PCB board has blue light flashing simultaneously for about 10 seconds.
2) I tried this on my Android 5.0 tablet also, and got "Pairing rejected by xiaoxiang BMS" when try to pair it. When run the Apps on my tablet, got the same displays as that run from my Android 5.1 Huawei smart phone, which has strong signal.
I installed both the old and new versions of the Apps for this Smart BMS onto my smart phone and tablet, but the smart BMS software dashboard screens don't work in each scenario.
The wiring, soldering, balance connection are all good, the resistance of each parallel group of battery cells are very closed, within the consistency range also, and the battery pack can charge and discharge, just the Smart BMS mobile Apps doesn't work.
This is an UART module to communicate to PC, but I didn't order this one, only the Bluetooth module.
3) I cleared the xiaoxiang Smart BMS Apps cache, then run the Apps again, a screen with elephant image shows up for a very short period of time, less than half second, then disappeared and changed to the screen with "Refresh" and "Fix" buttons, and with strong signal indication. Unplug & replug the Bluetooth PCB board from & into the Smart BMS PCB board, then run the Apps, but the software dashboard screens still don't show up. Charged the lower voltage parallel group cells to the voltage almost the same as the voltage of the other parallel groups cells, then run the Apps again, but the software dashboard still doesn't show up. Done some other different testing, but the software still doesn't work.
It is much appreciated if anyone has experience with this kind of Lithium battery Smart BMS and happened to the similar problems.