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To investigate the source and proportion of thermal runaway heat transfer of lithium-ion batteries in confined conditions space such as aviation transportation，the 18650 lithium-ion battery (100% state of charge) with lithium cobalt oxide (LCO) as the cathode material was used. The heat transfer model of thermal runaway of lithium-ion batteries was proposed by ANSYS Fluent software. Furthermore，the pyrolysis gas generated by the first battery and its thermal runaway was used as the heat source，and the second battery was heated to thermal runaway through radiation and convection. The results showed that when 2nd battery reached the thermal runaway temperature，the heat generated by the internal side reaction accounted for 30.01% of the total energy. The gas combustion generated by the 1st battery thermal runaway provided energy for 2nd battery thermal runaway，accounting for 5.64% of the total energy. When 2nd battery reached the maximum temperature，the heat generated inside the battery accounted for 87.39%，and the energy provided by the gas combustion was 1.76%. the pyrolysis gas combustion accelerates 2nd battery's thermal runaway，though it is a heat source，it is not a heat source. Although the combustion of pyrolysis gas accelerated the thermal runaway process of 2nd battery，the proportion of energy provided was relatively small.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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