The main factors that triggered the accident is the lithium-ion battery temperature; but the lithium-ion battery can only work within a certain temperature range.
Low-temperature environment, the battery capacity is not put out, and charge does not go. Been winter cold northeast region who will know the mobile phone power discharge faster, but slow charging, it is the same with LiFePO4 battery pack, and it can be used in solar powered portable generator.
High temperature environment more dangerous, lithium-ion battery is generally normal operating temperature is 45 degrees Celsius or less, and if it reaches 90-100 degrees, the problem occurs, the battery will cause a series of "self-heating reaction." Starting the problem of temperature occurred due to different battery materials vary, but there will be a limit temperature.
The temperature of the battery reaches the formation of side reactions, generally an exothermic reaction, an endothermic reaction also. This side reaction causes the temperature rises and the formation of a chain reaction. When the temperature reaches 150-250 degrees, thermal runaway occurs. Thermal runaway refers to the collapse of the membrane electrolyte combustion, the highest temperature can reach 900 degrees.
In this process, there are several characteristics of temperature: the self-heating starting temperature, thermal runaway onset temperature and the maximum temperature of thermal runaway. Different battery materials, these temperature values vary. For example, some battery thermal runaway maximum temperature up to 900 degrees, while others are only 300-400 degree. Some battery thermal runaway is smoke, some battery there is fire or battery explosion.
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