Can the power lithium battery pack cause the explosion?

作者：Iflowpower – Kaasaskantava elektrijaama tarnija

Lithium battery safety reliability means probability that lithium-ion batteries do not occur under normal use conditions. To avoid potential thermal out-of control, you must first prevent the main reason: find potential safety failure of lithium battery pack, find potential test methods for lithium battery safety failure, find measures to avoid or reduce these potential security failures. Lithium battery safety? The most commonly used lithium battery, safety hazard is not small.

▲ Acupuncture, short circuit, extrusion When the lithium battery is short-circuited, acupuncture or squeezing, the internal diaphragm rupture caused temperature suddenly exploded, and eventually exploded, especially lithium batteries that are poor in safety. This time will be even shorter, usually exploded about 5 seconds. ▲ The hot impact so-called thermal impact is the phenomenon of sudden rise in the ambient temperature.

If the temperature is high, then the lithium battery negative surface SEI film is decomposed, which causes heat reflection, and if the battery is dissolute, if it is not good, then internal temperature will Rapid rise, thus populated phenomenon. ▲ Examination If the lithium battery is overcharge, the excess energy will be converted to heat, thus causing damage to the battery body temperature. It often occurs in some charger or electronic products that do not have an overchard protection.

Lithium battery safety measures lithium battery have so many problems, naturally there is enough safety measures to travel. Vendors generally use common three safety means, one is thermally enclosed diaphragm, when acupuncture or squeezing, can ensure rapid adhesion of the diaphragm to prevent internal chemical reactions. The second is the PTC resistance of the resistance to the temperature resistance, when the battery has problems, thereby reducing the current, ensuring battery safety, this is similar to the fuse.

The third is the safety valve. If the internal pressure of the battery increases, the safety valve will burst to release internal pressure to ensure that the battery does not have exploded, and the normal cylindrical battery is in the normal cylindrical battery. Safety problems of power lithium battery packs are mainly divided into two aspects: abuse of thermal out of control, self-priming heat loss.

Among them, the abuse of thermal out-of-control is predictable, and the evaluation can be evaluated by testing can be improved by protective measures; and self-primating thermal out-of-control is unpredictable, and it is impossible to evaluate the test, and cannot be completely eliminated by quality management. Security measures do not completely eliminate lithium-ion batteries. Does the power lithium battery group heating explosion? Lithium batteries in life are almost ubiquitous, mobile phones, tablets, cameras, and laptops and other electronic products need to be powered by lithium-ion batteries.

However, the power lithium battery pack sometimes causes overheating or explosion because some unexpected conditions. Today, the battery capacity is increasingly, the user security problem is also particularly attractive. Taking a lithium ion battery commonly used by mobile phones as an example: its interior is fixed in the space outside the negative electrode, all of which is full of LiPF8 organic electrolyte solutions, in order not to allow liquid loss, to be sealed with the outer casing, when the outside is heated to a certain temperature , Liquid is hot and swelling, it is necessary to cause explosions.

Similarly, due to charging, discharge overheating, it will cause a lithium battery group to fry. The thermal lithium battery pack system causes a combustion or explosion caused by the power lithium battery pack to cause thermal out-of control, an electrolyte and other combustible substances; the local connection resistance resistance in the high pressure circuit of the power battery system is too large, and there is a large current When the temperature rises to the temperature, the flammable material inside the power battery system is fed; the power-lithium battery pack system is burned outside, resulting in continuous increase in the internal temperature of the power battery system, reaching the temperature of the fire point, igniting the internal combustible substance. Any form of overcharges in lithium batteries can cause severe corruption, and even exploding.

In order to avoid the sealed metal housing explosion, now the lithium battery pack will have a safety valve at the top, the safety valve is the standard of each 18650 battery, and is also the most important explosion-proof barrier. When the internal pressure of the battery is too large, its top safety valve will open the exhaust reduction and avoid explosion.