What happens if a battery goes bad?

Internal short circuit inside the battery or excessive local temperature will cause electrolyte to decompose and generate gas or precipitates, resulting in safety accidents such as smoke, fire or even explosion ( Dubaniewicz and DuCarme, 2014; Qi et al., 2017 ).

Why do lithium ion batteries explode?

The main reason for fire and explosion of lithium-ion batteries is that the internal temperature of the battery is too high, which causes side reactions to occur and to release a lot of heat, especially when the batteries appear in electric vehicles in series and parallel groups, even under normal working conditions.

Does low temperature affect battery performance?

Existing studies have shown that the battery performance decay rate is faster in a low temperature environment, the charging time is shortened, and the discharge capacity is significantly reduced. If the battery operates in the lowest critical temperature range, it may cause the battery to stop working.

How does ambient temperature affect battery capacity decay rate?

When the ambient temperature is above 20 °C, the battery capacity decay rate gradually increases with increasing temperature; when the ambient temperature is less than 20 °C, the battery capacity decay rate gradually increases with decreasing temperature. The battery capacity decay rate gradually increases with the increase of the discharge rate.

Why does a battery aging rate increase with temperature?

This is because the low temperature environment will cause the activity of the material inside the battery to decrease, the migration rate of lithium ions to slow down, and the internal resistance to increase, which will eventually lead to an increase in the battery aging rate.

How does battery capacity decay rate change with the number of cycles?

The battery capacity decay rate gradually increases with the increase of the discharge rate. When the number of cycles is less than 500, the capacity decay rate changes more slowly; when the number of cycles is more than 500, the capacity decay rate changes faster. In this manuscript, Hao Ji finished the experiment and wrote the manuscript.