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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

e24_LiPoly_3_OC_FC

Table 1. Test Information
Name
e24_LiPoly_3_OC_FC
Date
Description

overcharge test burnout setup. Lithium Polymer 3-cell-G, fully charged.
Specimen
LiPoly Battery
Ignition
overcharging
Project ID (s)
Thermal Runaway of Lithium-Polymer-Cell Batteries
Test Director
Davis

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
168
34
kW
Time to Peak Heat Release Rate
10.52
0.07
min
Total Heat Released, THR
1.98
0.43
MJ
Gas Burner Total Heat Released, NGTHR
0
 -
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
0.20
0.13
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
0.73
0.46
kg/kg
CO2 Yield = CO2 Generated / TFM
0.91
0.58
kg/kg
CO Yield = CO Generated / TFM
0.0151
0.0097
kg/kg
Soot Yield = Soot Generated / TFM
0.0092
0.0061
kg/kg
Baseline Hood Exhaust Flow
2.116
0.063
kg/s
Test Duration = Time(End of Test) - Time(Start of Test)
15.78
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Generic
 - -
Hood Size
3
 -
m
Effective Duct Diameter
0.483
0.004
m
Exhaust Flow Correction Factor
1.033
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
13.10
2.62
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
10.00
6.00
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
 Not measured -
kg
Final Specimen Mass, Mf (gravimetric)
 Not measured -
kg
Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
Figure 1. Plot of Heat Release Rate data with event markers and error bars shown at peak.
Table 4. Summary of Observed Test Events
Event Time (min) Description Video Snapshot Image
1
0.00
Start of Test
Start of Test
2
0.52
charger ON
charger ON
peak
10.52
Peak HRR
Peak HRR
3
15.78
stop sampling
stop sampling
4
15.78
End of Test
End of Test
5
18.47
Fire Out
Fire Out

Table 5. Supplemental Data Plots

Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Exhaust Duct Mass Flow Rate.
Plot of Exhaust Duct Mass Flow Rate.

Bryant, R. and Bundy, M. The NIST 20 MW Calorimetry Measurement System for Large-Fire Research, Technical Note (NIST TN) 2077, 2019
https://doi.org/10.6028/NIST.TN.2077

NIST Fire Calorimetry Database (FCD)
https://doi.org/10.18434/mds2-2314

Report Process Script Version
NFRL_Report_8.7.2
Last Updated July 16, 2026
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