Quite often, a cell will hit a High (or low) voltage unexpectedly and/or faster than the other cells. (On the DIY Solar Forum, this is usually called a ‘Runaway Cell’. ) The runaway cell can eventually cause the BMS to unexpectedly shut down ether charge, discharge, or both. This paper gives a brief description of what the likely causes are and what to do about them.
I would like to thank the many forum members that helped by providing valuable review comments on the early draft of the paper. A special shout-out goes to @HRTKD for his extra effort and review.
Additional comments on how to improve are always welcomed.
Note: This paper is discussing LiFePO4 batteries used in typical DIY solar systems. These batteries almost always use BMSs with top-acting balance circuits. Furthermore, these systems typically have relatively low Discharge and Charge rates as compared to the size of the batteries. Systems with other characteristics or from other industries are beyond the scope of this paper.
I would like to thank the many forum members that helped by providing valuable review comments on the early draft of the paper. A special shout-out goes to @HRTKD for his extra effort and review.
Additional comments on how to improve are always welcomed.
Note: This paper is discussing LiFePO4 batteries used in typical DIY solar systems. These batteries almost always use BMSs with top-acting balance circuits. Furthermore, these systems typically have relatively low Discharge and Charge rates as compared to the size of the batteries. Systems with other characteristics or from other industries are beyond the scope of this paper.
* Stripped threads on cell terminals that can not be properly tightened. (Do a search on the forum to find resources and discussions about what to do for stripped threads. One recently popular solution is to force thread a ¼" stainless steel stud into the 6mm hole. It will self tap into the hole)