Looks scary
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LimitedPowers
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Looks like someone disassembled a crushed battery. Please tell me you aren't going to try pushing current through those unless you're making a youtube video.
Brucey
Solar Wizard
"Grade B - Slight swelling"
timselectric
If I can do it, you can do it.
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Half price sale.
No, just regular FedEx delivery from Signature Solar
(Only kidding @SignatureSolarJess)
(https://diysolarforum.com/threads/f...rd-this-year-sig-solar-order-destroyed.85011/)
mikefitz
Solar Wizard
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- May 28, 2020
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If you watch the video you can see the guys have zero clue on how to build a battery pack. Batteries in a metal box with with weld spatter on the metal surface. No insulation between metal and cells, no insulation between cells. Junk buss bars.
meetyg
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OK, so who's gonna start stating all the mistakes he's doing?
I mean I really admire HBPowerwall (is he on this forum? I thought he was...) and his crazy 18650 builds, but obviously he hasn't been reading the forum resources for prismatic cell usage, LOL.
Really, I feel not worthy giving him criticism, but he's doing some things wrong and maybe this will prevent him or others from these disastrous mistakes:
1. Previous build probably didn't have any insulation between. the cells and the metal box. As we all know (do we?) we can't trust the blue plastic shrink on those cells to insulate. Especially in a mobile build with lots of vibration. Also, the aluminum casing is somewhat connected to negative, so if two series cell's casings touch each other, you basically get a short.
If two or more cells touch the metal box, again we have possibility for a short to occur in the pack.
Remedy:
Fully insulate the entire inside of the metal box. The packaging foam he was trying to use is not very heat resistant. He would be better off with some epoxy board (the yellow stuff we commonly see used in DIY kits).
At least maybe EVA foam.
2. These cells need a good tight fixture. Otherwise vibration will cause chafing between the cells. Also, there needs to be separators between the cells, for the same reasons.
Remedy:
Again, epoxy boards or EVA foam between the cells. Maybe get a strap tie gizmo like Will did in one of his videos, for a good fixture.
But you need to be careful of the corners, as not to put too much pressure on the corner of the outer cells. Need some material to protect the corners before strapping.
3. Copper busbars on aluminum terminals?
Isn't that a big no-no ?
From my little knowledge, I know that copper and aluminum can cause galvanic corrosion.
Also, non treated copper in a moist environment can corrode too.
Remedy:
Use tin plated busbars.
4. Cable management: should be nice and tidy, again to handle vibration and minimize movement.
So, what else do you guys/gals think he can do better?
I mean I really admire HBPowerwall (is he on this forum? I thought he was...) and his crazy 18650 builds, but obviously he hasn't been reading the forum resources for prismatic cell usage, LOL.
Really, I feel not worthy giving him criticism, but he's doing some things wrong and maybe this will prevent him or others from these disastrous mistakes:
1. Previous build probably didn't have any insulation between. the cells and the metal box. As we all know (do we?) we can't trust the blue plastic shrink on those cells to insulate. Especially in a mobile build with lots of vibration. Also, the aluminum casing is somewhat connected to negative, so if two series cell's casings touch each other, you basically get a short.
If two or more cells touch the metal box, again we have possibility for a short to occur in the pack.
Remedy:
Fully insulate the entire inside of the metal box. The packaging foam he was trying to use is not very heat resistant. He would be better off with some epoxy board (the yellow stuff we commonly see used in DIY kits).
At least maybe EVA foam.
2. These cells need a good tight fixture. Otherwise vibration will cause chafing between the cells. Also, there needs to be separators between the cells, for the same reasons.
Remedy:
Again, epoxy boards or EVA foam between the cells. Maybe get a strap tie gizmo like Will did in one of his videos, for a good fixture.
But you need to be careful of the corners, as not to put too much pressure on the corner of the outer cells. Need some material to protect the corners before strapping.
3. Copper busbars on aluminum terminals?
Isn't that a big no-no ?
From my little knowledge, I know that copper and aluminum can cause galvanic corrosion.
Also, non treated copper in a moist environment can corrode too.
Remedy:
Use tin plated busbars.
4. Cable management: should be nice and tidy, again to handle vibration and minimize movement.
So, what else do you guys/gals think he can do better?
After watching that vid I think the "Remedy" is a sign that says you have to be THIS smart to touch that stuff.
I'm all for winging it until it reaches the point where "it" can kill you instantly by just touching it.
Not to mention their winging it could get someone else killed if that thing explodes.
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