So would this be Option 1?I would connect each pack in parallel with another, and then connect those twin packs in series.
So, not just the 2 ends of the 10s string, the 2 ends and the 9 pairs of internal wires too.
So Duncan are you saying Option 1 with a batt bridge between the two packs?After that I used four separate strings with a "Batt Bridge" on each string
When a cell died I could immediately see it and disconnect that string
Just reread your post. Just to clarify I think you are saying each module in parallel then in series. In other words Option 2, correct?I would connect each pack in parallel with another, and then connect those twin packs in series.
So, not just the 2 ends of the 10s string, the 2 ends and the 9 pairs of internal wires too.
A hybrid between the two.Just reread your post. Just to clarify I think you are saying each module in parallel then in series. In other words Option 2, correct?
Well, it took a while, but the light bulb finally went on...Unfortunately, you are working with modules which already connect cells in series.
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I have no suggestion about what to do if you cannot internally reconfigure the modules to be suitable for your desired total capacity.
Unfortunately not, welded busbars inside the modules.The eGolf cells are metal-cased prismatics with threaded holes (for bolts) in the terminals. Unlike pouch cells with welded tabs, it is reasonable to re-configure these cells by building new interconnecting cables (or straps). So you can - if you want - connect all 240 of the cells so that they are first connected in parallel (groups of 6 cells), then 40 of those groups are connected in series.
That's unfortunate. All of the images that I have of the cells in this battery show threaded terminals, but they might just be showing a generic sample of the cell series rather than the actual cell variant used. I would want to open a module and have a look, if practical, just in case.Unfortunately not, welded busbars inside the modules.
only (some?) VW E-Up modules had threaded studs and can be changed.
It might even only have been pre-production models that had threaded terminals...That's unfortunate. All of the images that I have of the cells in this battery show threaded terminals, but they might just be showing a generic sample of the cell series rather than the actual cell variant used. I would want to open a module and have a look, if practical, just in case.
That's one reason to keep the original module cases, even if electrically reconfiguring them.... always use these cells under compression, they will swell when not confined (if someone does re-arrange them)
I would connect each pack in parallel with another, and then connect those twin packs in series.
So, not just the 2 ends of the 10s string, the 2 ends and the 9 pairs of internal wires too.
This was illustrated in another discussion:So would this be Option 1?
I have the pos and neg ends of the 10s string, got that, that is the end of the pack. Sorry I don't understand, what would I do with the other 9 pairs?
I've reconfigured a Volt pack into two parallel strings of 3 45V modules and 1 22V module (2 separate 42S3P strings).
Is there any advantage or disadvantage to making parallel connections between the two strings at the module terminals?
See attachment.
As swoozle already noted in the thread where the diagram was posted, each module is in parallel with an identical module, so there is no problem (no 6s in parallel with 12s). Of course in terrorr's situation, all modules are identical (all 4s), anyway.Except swoozle has a 6S module (22.5v) there... Which will basically get destroyed if it's paralleled at module level with the 12S (45V). (option2)
The Batt-Bridge monitor:So Duncan are you saying Option 1 with a batt bridge between the two packs?