Hummina Shadeeba
10 MW
Use ceramic knife.
And maybe a softer foam. What is it? I haven’t gotten it yet. a tossup and Theres like 15 different densities available.
How to hold batteries?
- Thread starter Hummina Shadeeba
- Start date
And maybe a softer foam. What is it? I haven’t gotten it yet. a tossup and Theres like 15 different densities available.
Hummina Shadeeba
10 MW
Im about to pour the foam but it gets pretty hot when curing. Is external heat as detrimental to cells as internally generated heat? What temp is too high? I at least plan to pour in small quantities
Will use Smooth-on foam-it 10. It’s pretty hard and tough. There’s a slower curing version of 10 that takes half as long to cure and I think wont get as hot but wasn’t is stock at my local store.
Will use Smooth-on foam-it 10. It’s pretty hard and tough. There’s a slower curing version of 10 that takes half as long to cure and I think wont get as hot but wasn’t is stock at my local store.
Last edited:
Hummina Shadeeba
10 MW
.o my god. I’m so dumb and irresponsible and almost made a big fire. Long story I pour foam in the top cracks of the battery but it needs more room and resin is clogging when expands, so decided better to drill the bottom of the box to pour there too. Dumb. I thought about the drill grabbing and thought I would go slow. I’m so dumb. Drilling like this is dumb. Even if I’d slowly stepped up the drill bits, which I didn’t and figured it’s plastic n I can just barely graze it and take my time.
The cell didn’t puncture. It isn’t getting warm as best I can tell and can’t find my temp gun. I dripped a spot of crazy glue on it feeling a need to do something, which is probably dumb or worthless as well, but i saw no bubbles at least in the crazy glue. pic is now misleading. It had no smell or liquid coming out.
How badly did I fuvk myself. I’ll put the battery on the bms n see if the group drops voltage.
I’m not taking it apart to replace the cell. I assume if it’s damaged as it is and not going into runaway now it still could in the future and is at a greater risk. How much risk? I think if the cell is damaged like this in most cases it will discharge slowly and safely and just be a burden on the whole pack, but is still usable if the cell is destroyed? I don’t know yet.
Guy who lives in a boathouse here told me he had two e-bike fires! I think he’s often drunk and is a drunk and he drops them in the bay water. There seems no consequences for irresponsible behavior.
If I’d set this battery on fire would it be good to hose it with water and try to cool it before others around it caught fire?
The cell didn’t puncture. It isn’t getting warm as best I can tell and can’t find my temp gun. I dripped a spot of crazy glue on it feeling a need to do something, which is probably dumb or worthless as well, but i saw no bubbles at least in the crazy glue. pic is now misleading. It had no smell or liquid coming out.
How badly did I fuvk myself. I’ll put the battery on the bms n see if the group drops voltage.
I’m not taking it apart to replace the cell. I assume if it’s damaged as it is and not going into runaway now it still could in the future and is at a greater risk. How much risk? I think if the cell is damaged like this in most cases it will discharge slowly and safely and just be a burden on the whole pack, but is still usable if the cell is destroyed? I don’t know yet.
Guy who lives in a boathouse here told me he had two e-bike fires! I think he’s often drunk and is a drunk and he drops them in the bay water. There seems no consequences for irresponsible behavior.
If I’d set this battery on fire would it be good to hose it with water and try to cool it before others around it caught fire?
Attachments
Last edited:
Gruesome
1 kW
That looks worse than I imagined, and I imagined it looking pretty bad... 
Edit: I mean the foam fill attempt, not the drilling damage to the cell.
Edit: I mean the foam fill attempt, not the drilling damage to the cell.
Last edited:
In this thread and one or two others, you have expressed the upmost concern for potential fire risk when building batteries. Now it sounds like you're potentially considering running the pack despite likely damage?
I'm sorry this happened, but you should treat the pack as a total loss at this point, it's too risky to do anything besides individual cell reclaiming. Consider yourself lucky that something worse didn't happen.
lnanek
10 kW
- Joined
- Sep 26, 2022
- Messages
- 695
Too bad it didn't use those plastic cell spacers to keep the cans apart. I've atomized a lot of packs, and even removed whole p-groups as well as single cells before. The ones with the cans super glued together often dent and deform as I try to pull a cell off its welds, though. Then one or more heat up and start venting hot solvent. Definitely not safe to work on due to lack of cell spacing.
It's outdoors anyway, so I'd probably just set the depth of my skill saw to the thickness of the plexiglass, cut a huge rectangle out of each of the three panels where the dead cell is, grab it with some cobras and rip it out anyway. Might get a fun fireworks display, might get a battery with one weak p-group that an active balancer could easily keep functional at reduced capacity.
Is it going on a ship? You could keep it on deck and only use and charge it under direct supervision where you could tip it overboard when it burns up. I wouldn't let it in my house or garage, though.
It's outdoors anyway, so I'd probably just set the depth of my skill saw to the thickness of the plexiglass, cut a huge rectangle out of each of the three panels where the dead cell is, grab it with some cobras and rip it out anyway. Might get a fun fireworks display, might get a battery with one weak p-group that an active balancer could easily keep functional at reduced capacity.
Is it going on a ship? You could keep it on deck and only use and charge it under direct supervision where you could tip it overboard when it burns up. I wouldn't let it in my house or garage, though.
Gruesome
1 kW
From the first post it seems it is going on a motorcycle, but maybe a quick eject button or battery jettison mechanism is in order for this build!
It's not even clear that the cell hit by the drill is bad. Could be just a dent and some superficial surface damage. Or did the drill cut completely through the outer metal layer?
It's not even clear that the cell hit by the drill is bad. Could be just a dent and some superficial surface damage. Or did the drill cut completely through the outer metal layer?
We had this discussion over at Second Life Storage (a forum devoted to rechargeable batteries and solar).
How much dent is too much?
Yes, I know, any dent is too much but after denting quite few hard to harvest cells the question is a bit more pertinent to me. Some dents are barely visible. Should those be tossed? I pulled some wrappers off some old cells in packs I've used for over a year and see dents in my daily drivers I...
Hummina Shadeeba
10 MW
I read that recently. I’ve been looking and there’s not much info as you say. The only studies I found were small but made me feel safer running it as is and my dent is maybe 2mm:We had this discussion over at Second Life Storage (a forum devoted to rechargeable batteries and solar).
How much dent is too much?
Yes, I know, any dent is too much but after denting quite few hard to harvest cells the question is a bit more pertinent to me. Some dents are barely visible. Should those be tossed? I pulled some wrappers off some old cells in packs I've used for over a year and see dents in my daily drivers I...secondlifestorage.com
Electrical Response of Mechanically Damaged Lithium-Ion Batteries
Lithium-ion batteries have found various modern applications due to their high energy density, long cycle life, and low self-discharge. However, increased use of these batteries has been accompanied by an increase in safety concerns, such as spontaneous fires or explosions due to impact or...
www.mdpi.com
I’ll plug the bms in today and see if it lost voltage. I plan to run it and keep it always outside. If that group of cells shows to be more work to balance and I assume has a dead cell in the group.. it sounds like that’s still ok running at reduced capacity
Last edited:
Hummina Shadeeba
10 MW
The cell wasn’t punctured. I still haven’t even looked at its voltage and can only compare its voltage in the group of 9 with the other groups of 9. It didn’t get warm.
Last edited:
Similar threads
