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Christ · 12-02-2009, 11:45 PM

I made an offer. The "normal" price was 19.99 plus 9.99 shipping.

Carlos - I don't have dibs, I've got what I need for now, and they're on there alot, just keep searching around for them. You can feel free to buy him out, if you like. So far, I think I've figured out the idea behind charging them.

I'm fairly certain you can charge them "normally", like with a car's alternator, as long as they're clamped tight enough to maintain their shape. They have their own form of overheat protection, in the pressure vent. Temperature monitoring should be used if you plan on charging them with high current, though, or at least an inductive load cell to check pressure while charging/discharging the pack.

What I'm going to do is make myself a pair of plates, one that I can put the battery against, and the other that will bolt to the first, compressing the battery module. I'm probably going to shoot for something like 20PSI across the whole of the module, using aluminum plates of approx 3mm thickness. Hopefully, the aluminum will help dissipate any excess heat.

In the case of the bike, and with cars (that still have their alternators), the cells will probably not see high current draw anyway, other than with starter use, so this shouldn't be too much of an issue.

If you look at the modules, each one has a single molded nut in it to mount with. Using more than one module side by side, each one interlocks with the previous/next one, and they bolt to a frame, so they hold each other down when you lay them in opposite directions. Once they're all bolted down, plates on each end should be sufficient to mechanically clamp them together, to prevent breakdown of the module wall and eventual internal shorting.

Anyone agree/disagree?

12-02-2009, 11:45 PM	#18 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	I made an offer. The "normal" price was 19.99 plus 9.99 shipping. Carlos - I don't have dibs, I've got what I need for now, and they're on there alot, just keep searching around for them. You can feel free to buy him out, if you like. So far, I think I've figured out the idea behind charging them. I'm fairly certain you can charge them "normally", like with a car's alternator, as long as they're clamped tight enough to maintain their shape. They have their own form of overheat protection, in the pressure vent. Temperature monitoring should be used if you plan on charging them with high current, though, or at least an inductive load cell to check pressure while charging/discharging the pack. What I'm going to do is make myself a pair of plates, one that I can put the battery against, and the other that will bolt to the first, compressing the battery module. I'm probably going to shoot for something like 20PSI across the whole of the module, using aluminum plates of approx 3mm thickness. Hopefully, the aluminum will help dissipate any excess heat. In the case of the bike, and with cars (that still have their alternators), the cells will probably not see high current draw anyway, other than with starter use, so this shouldn't be too much of an issue. If you look at the modules, each one has a single molded nut in it to mount with. Using more than one module side by side, each one interlocks with the previous/next one, and they bolt to a frame, so they hold each other down when you lay them in opposite directions. Once they're all bolted down, plates on each end should be sufficient to mechanically clamp them together, to prevent breakdown of the module wall and eventual internal shorting. Anyone agree/disagree? __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"