MJSfoto1956
10 kW
So I took a chance and purchased a 57Ah Li-ion battery pack from an AliExpress vendor touting 8 years experience. The nice thing was how easy it was to work with them -- I requested a custom configuration not shown on their web store (i.e. 20s17p/120A BMS) and within a day they gave me a link to finalize the purchase. Took more than 4 weeks to get here, but I expected that. Here is the actual pack after it arrived via Fedex Ground (N.B. I Photoshopped the background out):
Being the curious type, I wanted to see how this battery was constructed. So off came the PVC shrink wrap et voilá. Interesting how little Kapton tape they used. Instead opting for double-stick + six plastic panels. They used hot glue to glue the cells together into a grid pattern. The Anderson plugs are soldered not crimped. Not shown, but there are 140mm long serial bus bars on the bottom that carry the load from one side of the battery to the other (essentially two 10s17p batteries in series). Another weakness I can see is that all the power flows through just the very end of a single nickel strip. And finally, the dumb BMS they installed on this pack is this one: http://www.best-way.cn/html/product/580.html.
Looking for ideas here, but I think I will solder in a beefier terminus for the positive and negative leads. I might also change out the BMS to something with Bluetooth, add a heatsink, then mount it external to the pack. Finally, I'm thinking it would be a good idea to add some silicone thermal pads to the sides to absorb some heat.
So that's it for now. Any cheap and easy ideas to improve this pack will be greatly appreciated.
M
Being the curious type, I wanted to see how this battery was constructed. So off came the PVC shrink wrap et voilá. Interesting how little Kapton tape they used. Instead opting for double-stick + six plastic panels. They used hot glue to glue the cells together into a grid pattern. The Anderson plugs are soldered not crimped. Not shown, but there are 140mm long serial bus bars on the bottom that carry the load from one side of the battery to the other (essentially two 10s17p batteries in series). Another weakness I can see is that all the power flows through just the very end of a single nickel strip. And finally, the dumb BMS they installed on this pack is this one: http://www.best-way.cn/html/product/580.html.
Looking for ideas here, but I think I will solder in a beefier terminus for the positive and negative leads. I might also change out the BMS to something with Bluetooth, add a heatsink, then mount it external to the pack. Finally, I'm thinking it would be a good idea to add some silicone thermal pads to the sides to absorb some heat.
So that's it for now. Any cheap and easy ideas to improve this pack will be greatly appreciated.
M