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In order to quickly and effectively extinguish the lithium-ion battery fire，solve the problems concerned in the fire protection field，such as long fire extinguishing time and high water consumption，and explore the inhibition effect of hydrogel extinguishing agent on the thermal runaway of large capacity lithium-ion batteries. Firstly，the microstructure of hydrogel at high temperatures was analyzed by an environmental scanning electron microscope. Then，by building a lithium battery combustion test platform，the hydrogel fire extinguishing test was carried out. Taking the 135 Ah square aluminium case ternary lithium-ion battery pack for vehicles as the test object，the electric heating method was used to induce its thermal runaway and explore the cooling inhibition effect of hydrogel on lithium batteries. The results show that the pore structure of the hydrogel is destroyed after being heated，which is conducive to its adhesion to the surface of the object and continuous cooling. When using hydrogel for fire extinguishing and cooling，the maximum cooling rate of the battery surface is twice that of water. After the hydrogel is sprayed，the temperature of the lithium battery rises slowly，and the heating rate is only half that of water. Compared with water，the hydrogel can delay the thermal runaway of adjacent batteries for a longer time，which can bring longer safety time for rescue and escape.
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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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