Page | 017 Table 1 Cell Vent Gases: UL 9540A Cell Level Testing (Excluding O2 and N2)
Gas Name
Carbon Monoxide Carbon Dioxide Hydrogen Methane Acetylene Ethylene Ethane Propene Propane
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Benzene Toluene Dimethyl Carbonate Ethyl Methyl Carbonate Total
UL 9540A Module Level Testing
Chemical Structure
CO CO2
H2 CH4 C2H2 C2H4 C2H6 C3H6 C3H8 C4 (Total) C5 (Total) C6 (Total) C6H6 C7H8 C3H6O3 C4H8O3
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% Measured
10.881 27.107 50.148 6.428 0.264 3.283 1.100 0.379 0.125 0.190 0.027 0.005 0.002 0.002 0.055 0.004 100
Component LFL
10.9 N/A 4.0 4.4 2.3 2.4 2.4 1.8 1.7 N/A N/A N/A 1.2 1.0 N/A N/A -
Module level testing was conducted at a TÜV SÜD (TÜV) laboratory
approved NRTL and offers the cTUVus mark, which is equivalent to
ETL or CSA. Testing was performed on an entire MP2/2XL tray of LFP cells manufactured by CATL, as shown in Figure 5. The test results summarized below are from the May 2022 test.
Each cell within the tray was charged to 100% SOC prior to testing. During the test, the MP2/2XL tray is not connected to the BMS or TMS; meaning, they are not actively operating to prevent thermal runaway in a cell or to prohibit the propagation of thermal runaway from cell to cell. Thermal runaway was initiated via film strip heaters installed on both of the wide side surfaces of two cells, similar to the cell level test (see Figure 4). This resulted in the simultaneous heating of six cells forcing multiple cells into thermal runaway at the same time. The heaters were programmed to increase the temperature of the cell’s surface by approximately 4.17 - 4.52°C per
FEI Project # 22035 Page 15 01/23/2023 22035-03R (MP2 and MP2XL FPE Report)
in May 2022. TÜV is an OSHA- other NRTL marks such as UL,
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