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Fire safety test of lithium battery

by:dcfpower     2021-03-25
In order to confirm how much fire is broken due to overcharging and how long the battery will catch fire after overcharging, firefighters conducted simulation experiments. The chargers and batteries used in the experiment are products sold as power sources such as model cars. First, let the lithium polymer battery continue to be charged in a fully charged state until it reaches an overcharged state and catches fire. Then, according to the battery capacity and the current value during charging, observe the time to fire and the size of the flame during fire. Because the overcharge state is caused by man-made, so use the ordinary battery charger to charge. When charging, it is safe to note that the current does not exceed the capacity of the battery, but in this experiment, it was decided to charge the battery to rupture under the condition of fast charging. (1) The experimental conditions and experimental results. Charge the lithium polymer battery (2200mAh) in a fully charged state with a current of 6A. This is about 2.7 times faster charging than normal charging. 31 minutes after the charging started, the outer synthetic resin box broke, white smoke was emitted at 36 minutes, and the battery sprayed fire at 37 minutes. The maximum length of the flame detected by the video is 100cm (see Figure C). (2) Use 10A to charge the lithium polymer battery (2200mAh) in a fully charged state. This is about 4.5 times faster charging than normal charging. The experimental results are shown in Table 1. (3) Charge the lithium polymer battery (4200mAh) in a fully charged state with a current of 10A. This is about 2.4 times faster charging than normal charging. Compared with a lithium polymer battery (2200mAh), it has approximately 1.9 times the electrical capacity. The experimental results are shown in Table 1. u003cpu003eTable 1u003c/pu003eBattery capacity 6A charge 10A charge 220037min fire, the maximum flame is 100cm15min, the maximum flame is 100cm4200-20min, the maximum flame is 130cmu003c/pu003e
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