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Model 3 Pack: Intumescent goo?

scaesare

Well-Known Member
Mar 14, 2013
8,569
15,059
NoVA
So some time back there was a thread discussing Tesla's battery patents.

Among them was a patent for an intumescent fire retardant (goo). It's layer(s) of material that expand rapidly during heating, thus extracting the heat from the cell and helping quench any fire.

It appears that Tesla didn't implement that in the Model S pack, as number of them have been torn down, and although there's glue holding the cells together within the modules, that's it.

With the recent Munro & Assoc. teardown, we have some pics inside the pack. Amongst them is an interesting green layer of goo encasing the cells:

Tesla-Model-3-teardown-12.jpg


Tesla-Model-3-teardown-11.jpg


Tesla-Model-3-teardown-9.jpg


I wonder if this is possibly an implementation of the patent?

It could certainly be different adhesive, but if so it seems interesting that it's also on the tops of the cells (and ostensibly the bottom). It's as if the whole plastic battery module casing assembly has been backfilled with that material.
 

LukasSwan

Member
Nov 18, 2016
142
105
Halifax
So some time back there was a thread discussing Tesla's battery patents.

Among them was a patent for an intumescent fire retardant (goo). It's layer(s) of material that expand rapidly during heating, thus extracting the heat from the cell and helping quench any fire.

It appears that Tesla didn't implement that in the Model S pack, as number of them have been torn down, and although there's glue holding the cells together within the modules, that's it.

With the recent Munro & Assoc. teardown, we have some pics inside the pack. Amongst them is an interesting green layer of goo encasing the cells:

Tesla-Model-3-teardown-12.jpg


Tesla-Model-3-teardown-11.jpg


Tesla-Model-3-teardown-9.jpg


I wonder if this is possibly an implementation of the patent?

It could certainly be different adhesive, but if so it seems interesting that it's also on the tops of the cells (and ostensibly the bottom). It's as if the whole plastic battery module casing assembly has been backfilled with that material.
I was thinking the same thing when looking at oics
 
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ratsbew

Active Member
Mar 3, 2012
1,290
1,026
O'Fallon, IL
I'm very surprised that we haven't seen more discussion about the battery teardown. Any chance it also helps extract heat from the pack and spread it to the coolant better?
 

scaesare

Well-Known Member
Mar 14, 2013
8,569
15,059
NoVA
Not sure about heat spread. If anything it might insulate that effect slightly.

So in Jack Rickard's teardown video on EVTV, he also refers to this coating as intumescent material....
 

scaesare

Well-Known Member
Mar 14, 2013
8,569
15,059
NoVA
Now it is 2021 and I have only heard of one Model 3 fire. This stuff must work. Are they putting it in the new Model S/X packs?
Good question... I haven't seen a revised S/X pack teardown... seems like it would be a good idea...
 

mongo

Well-Known Member
May 3, 2017
13,444
41,923
Michigan
Now it is 2021 and I have only heard of one Model 3 fire. This stuff must work. Are they putting it in the new Model S/X packs?
Probably. I think the big enabler is putting all bus bar on the top so there is access for goo injection. If they can do that with the 1865(0)s...
 
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