Batteries, Chargers, and Battery Management Systems.
- 10 kW
- Posts: 600
- Joined: Jun 29, 2016 10:00 pm
Hillhater wrote: ↑
Oct 09, 2017 8:24 pm
Yes , i have seen similiar "unrapped" pictures before, but even there it still looks "suspiciously like". A pair of 18650s in a metal case.!
But AW linked to a post with the can cut open to prove it is a single , oval wound, cell construction.
Its basic performance specs are not outstanding by current standards, but maybe it has some advantage in cycle life, safety, US availability, etc ?????
From then graph.... 0.48 V drop beween 13A and 1 A curves...
Thats 0.48 V / 12A = 40 milliOhms DC.... Yeah not that great for a 5000 mAh or so cell.
- 100 GW
- Posts: 24834
- Joined: Aug 17, 2009 6:43 am
- Location: Phoenix, AZ, USA, Earth, Sol, Local Bubble, Orion Arm, Milky Way, Local Group
That sounds pretty terrible to me. My entire pack of EIG NMC cells, 14s2p, is only about 43milliohms according to the CA3.1's estimate!
Pajda wrote: ↑
Mar 10, 2018 4:57 pm
Yes they could be easily spot welded by cheap Chinese welders as for example LG HG2 cells.
Not according to the info in posts not far above yours.
- 100 W
- Posts: 139
- Joined: Jan 24, 2016 3:45 am
- Location: Czech Republic
Today I made test with a magnet and Swing5300 have non-magnetic! case. Probably really made from aluminium as is stated in one of its datasheets. Only magnetic material on Swing5300 cell is minus pole terminal.
- 100 mW
- Posts: 43
- Joined: Aug 11, 2015 2:09 am
Pajda ...have you tried welding or soldering the Swing? I actually got a couple to test and see. I do not have a welder at this time ...but soldering was no problem using a good iron (Hako) flux and Kester 44 solder. I am also not as adept at charging and testing as Thunderheart ....so right now I have to go with his extensive testing.
- 1 µW
- Posts: 1
- Joined: Mar 15, 2018 4:54 pm
at my previous job we built a ton of packs with these boston power swing 4400 and 5300 cells. I forget the name of the welder we used but it worked really well. We did have to use slightly different settings for each polarity. They are great cells to work with. Speaking of, I have an entire pallet of brand new boston power swing4400 cells that I bought for an ev project. I gave up on that project and am looking to sell the cells. I will need to recount what I have but I believe I have enough to do 2 compact cars with big packs. I also have some examples of welded packs and the foils we used.
I just looked and we used an old Miyachi welder. I think I know of someone that has one to sell too!