Forum Discussion
jrnymn7
Jan 15, 2015Explorer
SMK,
To clarify:
There seems to be some overall confusion regarding the phrase "full charge". The description says, "As the cells begin to recharge...". Monitoring happens throughout, and if a particular cell reaches a certain voltage, the BMS shuts down charging. But this can occur at any level of battery SOC. So, although one cell may reach the max voltage cutoff point; due to cell imbalance; this is not what I would consider "full charge", but rather "unbalanced charge". One cell has reached "full voltage", but collectively, the battery has not reached full charge.
Although I'm not sure if this is what Mena was getting at, it seems to me, at 13.6v, (i.e; 3.4v per cell), if the cutoff voltage is 3.9v, then it seems at least possible to me that an unbalanced cell could reach this point before the others, at any given SOC, and cause a shutdown. Then again, I don't know how badly imbalanced a cell would have to be for this to occur.
To clarify:
There seems to be some overall confusion regarding the phrase "full charge". The description says, "As the cells begin to recharge...". Monitoring happens throughout, and if a particular cell reaches a certain voltage, the BMS shuts down charging. But this can occur at any level of battery SOC. So, although one cell may reach the max voltage cutoff point; due to cell imbalance; this is not what I would consider "full charge", but rather "unbalanced charge". One cell has reached "full voltage", but collectively, the battery has not reached full charge.
Although I'm not sure if this is what Mena was getting at, it seems to me, at 13.6v, (i.e; 3.4v per cell), if the cutoff voltage is 3.9v, then it seems at least possible to me that an unbalanced cell could reach this point before the others, at any given SOC, and cause a shutdown. Then again, I don't know how badly imbalanced a cell would have to be for this to occur.
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