leelorr wrote:The USA seller told me that the V1 version is rated by them for about 2.5 amps per cell. I am waiting for V2 because I need about 6 amps per cell as a max draw. I must have missed the post(s) about how to raise that number for the V1 version. Do you have a link to information about that?
It's actually 3.5A per cell continuous, 5A peak for bursts.
We don't have a firm number for the V2 kit ratings yet, we are still in the development and testing phase.
Regarding the V1 kits, the limit isn't as much the busbars as it is the spring contact. Beefing up the busbars can help a bit, but there's a limit to how much you can pull out of the V1 kit. If you need fairly high power, better to increase the number of parallel groups. For now though, the V1 is really meant for medium power users. Like those with 15A-25A controllers, that are happy with batteries in the 4-7p range. You can do lower p groups, but you start to get higher resistance when not distributing the load over more cells. It works, but more resistances means you waste some cell energy as heat, not ideal for high power scenarios.
I can't wait to hear the results of the V2 kit. This looks great! I'd really like to try it in the future.
Today I thought over how I would want to design my battery pack again and this is what I came up with for a final design.
100x Cells will go inside generic anti-friction plastic holders (held together with tabs or epoxy)
cells will be configured in 20S6P:
parallel and series connects for two parallel sets of cells will be made by a single 26ga piece of copper, with tabs for mounting/balance wire.
All copper connects will have 2mm deep, 9mm diameter, dents to make contact with the cells.
Dents and cells will be scuffed, and maybe some dielectric grease.
1mm x 7mm disc magnets will secure the copper to the batteries, matching poles to the respective side of the cell, and epoxy magnets too the copper.
Tabs from copper contacts will go up in to an insulating mat, and be folded inward, and epoxied in to place.
second layer of matting would be adhered to the previous mat, preventing and contact with anything outside.
This would all be placed in a rugged metal box, lined with insulation, wires would be routed out to bms, mounted to the box.
The box would also have & a hinged, or all latch, lid. so that when then lid is closed it should compress the battery a little extra to ensure good contact.
I hope I described it okay, I could try to draw/model it.
I also though of a way that I could 'fold' my battery in the center, but more insulating mat in between, so that my wires end up on the same side.
helping reduce wire length from my battery to the controller or motor, and making cable management easier.