Battery Pack Standard Dimensions and Specs

[johnrobholmes]

It seems that most of the conversions here build batteries to fit the build, unless it it built around Lead Acid. Is this a correct assumption? If you were to have prebuilt Lipoly or LiFe batteries made, what sort of physical sizes/ voltage/ capacity specs would you want?

The lack of standards makes every build unique, but also causes roadblocks to make easy conversions or builds. I got around this by scratch building my e-bike, but not everybody has the ability to machine and weld (although I am pretty poor at both anyway).


I would want packs built rectangular like a small lead acid pack, maybe 4 amp hour chunks. Voltage for lipoly would be great at 6s, or for LiFe at 8s. I would want my cells nice enough that a BMS system is not needed, other than voltage cutoff (function of motor controller) and a balancing system (part of the charging system). This would make the pack as light as possible.

 

[johnrobholmes]

Poo, this should have gone in the battery subforum. If a mod could please move it for me I would appreciate it. I aint a mod here

 

[Tiberius]

John,

Its a good question. Given that there are some standard sizes for the cells that are used as building blocks, then standard case sizes ought to be possible.

That said, I have ended up building custom cases. I looked into modifying PVC air ducts, but ended up making a special size myself.

I think a lot of people may be assembling the cells and then covering them with layers of insulation and heatshrink, etc. Ie., not making a case as such.

Just as important as cases and sizes, would be neat standard methods of mounting packs on bikes.

Nick