Thanks Chris and James!
Yes, the paper is an interesting read. And yes, it seems to confirm my suspicion that if you parallel cells at the lowest level, there is no separate monitoring of the individual cells. If one cell goes "bad enough", it should eventually bleed off the good cell(s) in that parallel group, and cause the whole group to be detected as being out of spec.
I'm not sure I'm entirely comfortable with that - but if Lithium batteries are as long-life as advertised, maybe it's not an issue.
Though it also makes it harder to increase capacity. Instead of ("easily") just adding another parallel pack, you have to take all the packs apart and re-assemble them in bigger boxes...
John
On Tuesday, October 2, 2018, 5:45:42 PM CDT, clh5_98@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
James,
From what I read in the Orion white paper, the concern is about using parallel strings, not about paralleling cells in the same string. Everything quoted in the reply to my post about this white paper is about parallel strings, not paralleled cells in one string. From what I see paralleled cells in a single string are still just one string. I wonder how many paralleled cells are in CALB 180 cell? Just to be clear, I am not advocating, or entertaining the idea of paralleled strings. To do it correctly and safely would be cost prohibitive and would make for a complex system.
John,
In the Orion White Paper they talk directly about monitoring a group of paralleled cells as one cell. Check it out.
Chris
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