Contained Burn of #18650 Lithium Ion Batteries & Containment Vessel Pressure & Volume.
10/24/13
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REQUIRED:     
Find the volume of expelled gas & resultant pressure for the assumed Pressure Vessel (PV). After Thermally Burning 1,2,3 #18650 Cells.  
GIVEN:  
Assumed PV:  Inside Dia. 6.0 inch Schd 80 Pipe.    

n = number of moles of Ideal Gas    
1 Batt. gas evoled = 2.54 Liters (0.00254 cubic meters)  at STP (0 deg. C and 1 atm  
ASSUME:
SOLUTION:
Volume of Pressure Vessel:    

Number of moles of Ideal Gas in this PV volume @ 20 deg. C and 1 atm:   
Where:   

Where P*V=n*R*T  

Number of moles of gas generated at STP per each battery where the evolved gas volume is .00254 m^3.  
Then:  

Equilibrium tempurature of mixed gas. (before cooling @ 733 deg C)

Find the absolute pressure of the mixed gases in the PV at T`    

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