Hi All,
I'm a bit perplexed and am looking for advice. I have come across a handful of Li-Ion packs with their own BMS's, each is 4s3p.
All are the same age and capacity. I am thinking of putting a bunch (50ish) of them in parallel one with another, to make a large battery bank out of the individual packs. So the total will be 14.4 V with a large capacity. The seller says that this is just fine.
Here is where I'm confused. What happens if one cell's BMS trips for whatever reason. What will happen? What if the BMS opens the individual cell back up after the other cells have undergone a voltage change, will that cause a lot of current to flow back in/out of the cell re-tripping the BMS, or causing cell damage?
For example, cells are discharging and cell A BMS trips. Cells B-Z continue to discharge. Cell A BMS reactives and is no longer at the same state of charge as the others.
Is this a concern, or am I fabricating an unlikely scenario? Or am I misunderstanding how it may work?
I like the redundancy of multiple BMS's and obviously not having to purchase a larger BMS. However I don't want to cause a problem down the road. Am I better off stripping the BMS's off the cells and putting one large BMS in?
Thanks!!
I'm a bit perplexed and am looking for advice. I have come across a handful of Li-Ion packs with their own BMS's, each is 4s3p.
All are the same age and capacity. I am thinking of putting a bunch (50ish) of them in parallel one with another, to make a large battery bank out of the individual packs. So the total will be 14.4 V with a large capacity. The seller says that this is just fine.
Here is where I'm confused. What happens if one cell's BMS trips for whatever reason. What will happen? What if the BMS opens the individual cell back up after the other cells have undergone a voltage change, will that cause a lot of current to flow back in/out of the cell re-tripping the BMS, or causing cell damage?
For example, cells are discharging and cell A BMS trips. Cells B-Z continue to discharge. Cell A BMS reactives and is no longer at the same state of charge as the others.
Is this a concern, or am I fabricating an unlikely scenario? Or am I misunderstanding how it may work?
I like the redundancy of multiple BMS's and obviously not having to purchase a larger BMS. However I don't want to cause a problem down the road. Am I better off stripping the BMS's off the cells and putting one large BMS in?
Thanks!!