These three situations may cause lithium ion battery explosions

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Nanjing once happened a net approval of the net approximation, and the report of the investigation announced the latest progress of the investigation in the notification of Nanjing Jianyi police: After investigation, the passenger Cai took the left hand to carry plastic food, right hand Repair electric car lithium-ion battery pack, the vehicle is driving about six minutes to the incident place, the lattice suddenly smoked. Driver Zhou Joy to save the fire, the vehicle hit the roadside flower bed. At present, the driver wrote back, the left leg burns, no life is dangerous, passengers Cai Mou die.

Lithium-ion batteries are closely related to life, but the consequences of explosion are unimaginable. In the end, what is the original origination, will cause lithium ion batteries to explode? The blue battery on the right side of the screen is used to do the 3.2 volt phosphite ion battery, which is approximately equivalent to the capacity of a battery cell for electric vehicle.

The "whiteboard" on the left is a state after the combustion test, and it can be seen that the safety valve has been opened, showing a state of being blocked. After the lithium ion battery after burning, what changes can be born inside? The test personnel cut the lithium-ion battery, which was cutted on site . When the inside of the battery is detached, it is a layer of roll-shaped structure, just like an egg roll, one layer is a positive, one layer is Negative pole, and one layer is a diaphragm.

Since the battery has passed a combustion test, the diaphragm is organic matter. The conductive substance inside the battery is lithium ions, and can pass through the separator to pass back to the positive and negative electrical energy, but in extreme cases, the diaphragm between the positive and negative electrodes inside the battery may be sprouted and melted because of heat. In this way, the positive and negative electrode of the battery will touch together, it will instantly have a relatively large current, this current will have a relatively large amount of heat inside the battery.

If it is not possible to inhibit timely suppression, this calorie may continue to be born, and cause more separators to melt, so there is more positive and negative electrodes to form a positive feedback, resulting in a battery thermal out of control. Situation, in extreme cases, it is possible to cause combustion of the battery. After dismantling test, it can be found that the combustion of the lithium ion battery is not only severely damaged, but also severe deformation inside, and is clearly carbonized.

Sun Lei, Engineering Engineer, Jiangsu Electric Academy, pointed out: "Lithium ion battery, it is originally an energy stored equipment, it will be more convenient for us to live in a ordered release process, but in a disorderly or In the event of out of control, the words that release this energy will cause a relatively harm, or even the combustion or explosion of this battery we often see. In the process of release and out of control, some combustible gases, such as hydrogen, carbon monoxide, and even some toxic gases such as hydrogen sulfide, hydrogen fluoride such as toxic gases, will cause a damage and harm to people. "The power of the lithium ion battery is huge, if the consequences are quite dangerous! So, in what circumstances, the lithium-ion battery will have a safety hidden danger? Sun Lei said, pay attention to these three situations! The first is too charge, Continue to charge the battery, but no protection measures.

The second is short circuit, the internal short circuit may be some damage to the structure, the internal positive and negative pen direct contact, the external short circuit includes some electrically conductive wire, copper wire or some metal sheet, which causes an instant High current, may cause heat and battery burning. The third is heating, such as the external weather is hot, or the temperature of the environment is relatively high, and in this case, some organic matter inside the battery, such as the melting and shrinkage of the diaphragm between the positive and negative electrical poles, The shortcoming of the positive and negative battery is caused, eventually causes the battery's combustion and explosion.

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