This is a design I’m working on. The idea behind the wave pattern is so that they can be stacked without losing all too much space compared to rectangular cell packs.
I’m putting a 60C thermal fuse in between each cell pair. Should a cell overheat, the fuse will pop and render the pack useless. This is an additional safety feature on top of a BMS and periodic manual checkups with a thermal camera.
The idea behind all cells pointing upwards (positive facing up) is also a safety feature. Should one start to vent or catch fire the flames will go up immediately triggering an extinguisher above the cell pack.
Let me know what you think! I’m not finished with it yet but if you want the design files already let me know I’ll send them to you.
Edited with a deshittified version of imgur.
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May I ask why 18650? 21700 have better energy density and theyre easier to get these days. The price has also come down a lot.
Because I have a metric shitload of them available. Indeed if i was going to order fresh cells 21700 is better especially for a home battery system.
Way better to use your old junk. I like that youre make your own home battery, ive considered it. I have solar installed and would love to not consume grid power at night. I’m thinking of installing a bank of lead acid batteries under my ground mount solar that would dump power into my home at night.
Looks beautiful. What are you planning to power with it?
The plan is to have it function as a home battery, connected to either a solar panel or a small balcony wind turbine. I also want to charge it when the electricity cost is low and discharge when the electricity cost is high on average.
Another part of the project is to build a grid-tied inverter.
In case it is blocked in your region: https://imgur.artemislena.eu/a/aQJA9o9
Ooh, a deshittified version of imgur? Or did you invent time travel?
Third party frontend.
Looks awesome. How much space is between the batteries? Could you push air through the gaps to cool them?
Thanks! There’s about 3mm space in between the batteries so air would easily flow through. I’m not sure if that is preferable though, ideally the cells do not get warm at all.
Would like to see, but imgur is stalkerware bordering on malware. Sorry this comes across as negative digital neighbor friend. If at all possible, use your instance’s pic rs host, a federated alternative, or other honest and straightforward host.
I know it is hard to care when doing electronics and all of the stalkerware nonsense in that space. I’ve got my own bedroom lab.
Yeah. I see what you mean. I find it acceptable for certain use cases like a quick showcase for stuff I want to share freely anyway.
It’s a bad habit.
