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VIDEO: Overview of the 600 Cell 7.4V 750Ah Battery Module
#11
Sorry to resurrect an old thread, but this is a very nice pack arrangement. You never showed the negative side in this video. I'm curious whether you fused and bussed the negative in the same way or spot welded the whole negative side?
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#12
(10-20-2019, 04:20 PM)cowpen Wrote: Sorry to resurrect an old thread, but this is a very nice pack arrangement. You never showed the negative side in this video. I'm curious whether you fused and bussed the negative in the same way or spot welded the whole negative side?

The negative side is fused/bussed the same as the positive side. After working on this a bit, I decided not to bolt the packs together though as seen here. I have them installed as individual 300p packs rather than 600-cell "modules".
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#13
(10-21-2019, 11:44 AM)mike Wrote:
(10-20-2019, 04:20 PM)cowpen Wrote: Sorry to resurrect an old thread, but this is a very nice pack arrangement. You never showed the negative side in this video. I'm curious whether you fused and bussed the negative in the same way or spot welded the whole negative side?

The negative side is fused/bussed the same as the positive side. After working on this a bit, I decided not to bolt the packs together though as seen here. I have them installed as individual 300p packs rather than 600-cell "modules".

OK thanks. And just a followup so I'm clear regarding the level of safety - if a cell shorted internally the rest of the pack would blow the fuse leaving only 4 cells still trying to do the same thing. Worst case scenario is 4 cells x 4V x 5A shorted current  =  80A rushing to the short? Would this event be "over" before that bad cell caught fire?
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#14
(10-21-2019, 11:55 AM)cowpen Wrote:
(10-21-2019, 11:44 AM)mike Wrote:
(10-20-2019, 04:20 PM)cowpen Wrote: Sorry to resurrect an old thread, but this is a very nice pack arrangement. You never showed the negative side in this video. I'm curious whether you fused and bussed the negative in the same way or spot welded the whole negative side?

The negative side is fused/bussed the same as the positive side. After working on this a bit, I decided not to bolt the packs together though as seen here. I have them installed as individual 300p packs rather than 600-cell "modules".

OK thanks. And just a followup so I'm clear regarding the level of safety - if a cell shorted internally the rest of the pack would blow the fuse leaving only 4 cells still trying to do the same thing. Worst case scenario is 4 cells x 4V x 5A shorted current  =  80A rushing to the short? Would this event be "over" before that bad cell caught fire?

The theory is that it would break the fuse and discharge the remaining 4 cells. I haven't tested it, but this is how laptop batteries work. Those big 12-cell batteries have 4 cells in parallel and do not use individual cell fuses. My setup is no different than these, other than adding a 5th cell.

I do plan to do some fault testing, I just haven't had the time...
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