“How to suppress an 18650 battery pack fire”

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garolittle   100 W

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“How to suppress an 18650 battery pack fire”

Post by garolittle » May 01 2018 10:08pm

BACKGROUND:Here are the main components of my electric go kart...
Brand new Samsung INR18650-25R cells (20Amps maximum continuous discharge)
Battery packs: Using the Samsung cells, I plan to have two separate 20S10P packs connected in parallel
Motor: 72V Motenergy Brushless Motor (ME0201014201). Continuous current - approximately 50 - 60 amps at 72V
Charge Controller: Sabvoton (svmc72150) DC Current Limit: 100A
ISSUE: I know that lithium ion battery pack fires are very dangerous and almost impossible to extinguish. However, if I wrapped each battery pack in the following product, would this help “suppress” a battery pack fire so that the driver would have a few extra moments to get away safely?

http://www.electro-wind.com/rochling-gl ... 48x96.html

Basically each battery pack would be shrink wrapped and then wrapped in the fiberglass product as seen in the link above. Finally the entire set up would be placed into a metal casing which would serve as the battery holder. Thanks for any suggestions you may have. :?:

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jonescg   1 GW

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Re: “How to suppress an 18650 battery pack fire”

Post by jonescg » May 01 2018 10:46pm

Consider using an intumescent material between and around the cells. It will hold the fire back for a while and buy you time.
Firestop is a popular material.

Otherwise polycarbonate is a fire-suppressing / self extinguishing material which can work well in the right structure.

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garolittle   100 W

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Re: “How to suppress an 18650 battery pack fire”

Post by garolittle » May 02 2018 4:49am

Thank you. I really appreciate the feedback. I will research each of these items carefully.

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flippy   10 kW

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Re: “How to suppress an 18650 battery pack fire”

Post by flippy » May 14 2018 3:01am

what kind of fireball are you expecting?

you need to puncture each cell and really put some effort in them in order to get even a single one to even smoke.
in the case of a crash that would destroy the battery pack you would basically end up with a few dozen cells flying (away from the vehicle).

dont think you wil get a massive fireball as soon as you hit something. unless the battery is made by ACME. :wink:
if you build the case of sturdy alu sheet and insulate the inside with sticky dense foam and i wish you many happy miles.
prehaps put a extra bar in front of the side to protect it more during low speed crashes or hard "contact" during racing.
Lithium beats liquid dinosaurs.

Hillhater   100 GW

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Re: “How to suppress an 18650 battery pack fire”

Post by Hillhater » May 14 2018 7:23am

Try to kep the pack in the center of the kart, under your knees, rather than on the outside chassis rails.
That will protect the pack from damage and improve the handling and chassis balance.
This forum owes its existence to Justin of ebikes.ca

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fechter   100 GW

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Re: “How to suppress an 18650 battery pack fire”

Post by fechter » May 14 2018 10:05am

If the pack is completely enclosed in a vented metal box, the vent will be the only place where smoke/flame can come out. Aim the vent in a safe direction. The fire in a lithium battery is primarily the flammable solvent burning with air. If the air is kept away from the solvent, you can prevent flames. By the time solvent vapor reaches the vent, it is hopefully cooled to below the self-ignition temperature.
"One test is worth a thousand opinions"

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marty   10 MW

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Re: “How to suppress an 18650 battery pack fire”

Post by marty » May 14 2018 4:18pm

Most important to do everything possible with electricity so that batteries don't catch on fire. BMS, fuses, and more.

See Common pack design mistakes, how to avoid?
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Cephalotus   1 kW

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Re: “How to suppress an 18650 battery pack fire”

Post by Cephalotus » May 17 2018 10:18am

A battery pack will burn at 800-1000°C.

Wrapping it in that stuff will make a dangerous and toxic fire i9nto a dangerous and very toxic fire.

Themal runaway prevention should be done on a cell by cell base. This is an important security advantage of using small 18650 cells, 99.99% of battery cell builders are just throwing away.

Passively Thermal Runaway Propagation Resistant Battery Module that Achieves > 190 Wh/kg

https://ntrs.nasa.gov/archive/nasa/casi ... 003490.pdf

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garolittle   100 W

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Re: “How to suppress an 18650 battery pack fire”

Post by garolittle » May 18 2018 2:34pm

That is great information. I really appreciate it. I’m going to read that again so I can process it.

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