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The finish-ish of a pcb based 14S 80P powerwall
#11
(08-09-2018, 10:05 PM)Jon Wrote: Looks like a well thought out, neat and interesting design.
I hope testing goes well.

Thanks.
bigrick likes this post
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#12
This pcb style really interests me. Looks good. Fuses easier to work with. Completely modular and easy access to each cell.
I take it that whats shown in the photo is all parallel? and you will have 14 of these in series for a 14S80P wall?
Also, how do you calculate the track widths for the pcb? I use the nickel strip charts for my own nickel strip build. Is there an equivalent for pcb tracks?
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#13
Nice ....how did you design and produce those boards?
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#14
(08-11-2018, 12:00 PM)Daveyboy Wrote: This pcb style really  interests me. Looks good. Fuses easier to work with. Completely modular and easy access to each cell.
I take it that whats shown in the photo is all parallel? and you will have 14 of these in series for a 14S80P wall?
Also, how do you calculate the track widths for the pcb? I use the nickel strip charts for my own nickel strip build. Is there an equivalent for pcb tracks?

All parallel and will have 14 in series.
Fuse wire is a pain, because it's so thin to work with. I've got some axial glass fuses on order, which will speed thing up.
If I had to do it again, I would put pads for fuse holders, so that you can put ordinary 20mm glass fuses in, or use the pads for axial fuses, or just plain fuse wire.
There are sites for calculating current capacity of pcb traces.
The backplane pcb is just 2 double sided traces, in 2oz copper, for what I'm hoping will be ample for my 48V system.
Cell pcbs are just 2 double sided traces in 1oz copper.

(08-11-2018, 01:03 PM)Headrc Wrote: Nice ....how did you design and produce those boards?

Thanks.
I use an old school pcb software app called Traxmaker, then send the gerber files to China and wait a month.
Korishan and Ahmed_Ali like this post
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#15
(08-11-2018, 01:44 PM)grumble Wrote: The backplane pcb is just 2 double sided traces, in 2oz copper, for what I'm hoping will be ample for my 48V system.
Cell pcbs are just 2 double sided traces in 1oz copper.
2 x double sided, so 4 traces total? Sorry for my dumb questioning, i'm just interested in learning about what you are doing. It's something I might have a go at when i'm finally done with my more traditional style powerwall and I need to move to another section of wall. It sure looks easier than what i'm currently doing. I'm designing my system to handle 1 amp per cell, and 80 amps through a pcb just seems a lot to me with my very little knowledge of pcb's  Rolleyes

Also, what are your thoughts on trace fuses? Too much of a fire risk maybe?

Like in the photo of the attached: https://electronics.stackexchange.com/qu...d-as-fuses
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#16
(08-11-2018, 03:09 PM)Daveyboy Wrote:
(08-11-2018, 01:44 PM)grumble Wrote: The backplane pcb is just 2 double sided traces, in 2oz copper, for what I'm hoping will be ample for my 48V system.
Cell pcbs are just 2 double sided traces in 1oz copper.
2 x double sided, so 4 traces total? Sorry for my dumb questioning, i'm just interested in learning about what you are doing. It's something I might have a go at when i'm finally done with my more traditional style powerwall and I need to move to another section of wall. It sure looks easier than what i'm currently doing. I'm designing my system to handle 1 amp per cell, and 80 amps through a pcb just seems a lot to me with my very little knowledge of pcb's  Rolleyes

Also, what are your thoughts on trace fuses? Too much of a fire risk maybe?

Like in the photo of the attached: https://electronics.stackexchange.com/qu...d-as-fuses

Pos and neg on 1 side... pos and neg on t'other... with vias, holes and pads joining them together... If that makes any sense.
I've got a total of 90mm traces for each pole, which according to this calc is plenty.

Trace fuse is entirely feasible, but if it blows, you'll end up putting a wire across it anyway.
Daveyboy likes this post
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#17
It has been a busy week.

lordxenu, jdeadman, Ibiza And 3 others like this post
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#18
nice Smile

i hope
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#19
What for BMS ?
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#20
(08-12-2018, 03:27 PM)michaell Wrote: What for BMS ?

No BMS. Don't tell the Politzei.
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