What are the reasons for the 18650 lithium-ion battery explosion?

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Proveïdor de centrals portàtils

There are a lot of 18650 lithium-ion battery explosions, and there are three important originals here. The three primary primation of the 18650 lithium-ion battery exploded by 1, and the 18650 lithium ion battery was overcharged, which is a common explosion. Lithium-ion batteries do not work within the specified voltage range, otherwise there will be a safety hazard of explosion.

For example, the three-dimensional lithium battery is routine 2.5V ~ 4.2.

2V; ferrite lithium iron core is routinely 2.0V ~ 3.3.

65V. When the 18650 lithium-ion battery is charged, the lithium ion movement of the positive electrode to the negative electrode, inlaid in the mesh structure of the negative electrode material, if the lithium ion battery is overcharged, it is easy to cause lithium electrodes, resulting in lithium crystallization, piercing the diaphragm, will Resulting in short circuit inside the battery, thus causing an explosion. This is why lithium-ion batteries are charged when charging, and the overcharged protection circuit is paid to overcharge the lithium ion battery.

The lithium-ion battery protective plate will monitor each string voltage of the lithium ion battery pack, more than the overcharge voltage, the lithium-ion battery protective plate is cut off, and the use of lithium-ion batteries will be protected. The lithium ion battery pack, if there is a pre-charge explosion, most of the case is because the lithium ion battery has a 0V voltage, or the protective plate is abnormal, and the lithium ion battery cannot be preserved; Is the charger use error. For example, 36V lithium-ion battery pack, 10 strings to be triendal lithium, if two serial cell voltage changes for 0V, the charging voltage 42V of the charger will charge the remaining 8 strings, the protective plate function is abnormal.

Experts cannot be supplied. 8 The uniform voltage of the string battery will be charged to 5.25V or more (42V / 8 strings).

This will cause the lithium ion battery to be overcharged, causing an accident of an explosion. If the charger is wrong, the lithium ion battery pack is not charged in accordance with the specified special charger, and the lithium ion battery protectors are abnormal, and the lithium ion battery pack is overcharged. For example, the 36V lithium-ion battery pack, the output voltage of the dedicated charger should be 42V, if the charger (charging voltage is 84V), the 84V charging voltage pen is loaded at 36V lithium ion battery pack The components of the protective board are easily damaged, and the function is easily invalid.

At this time, the lithium-ion battery pack will charge without protection, each string battery voltage will be charged to 8.4V or more (84V / 10 strings), the full charge voltage of the three-dimensional lithium is 4.2V, 8.

4 V 's voltage to the three-dimensional lithium monomer battery, it will be more dangerous and it is easy to cause explosion. So, use a lithium-ion battery correctly using a lithium-ion battery protection plate correctly, correctly using a lithium ion battery charger. 2.

The short circuit 18650 lithium-ion battery is shorted, including internal short circuits and external short circuits, will cause an explosion of 18650 batteries. There are several originals of the internal short circuit, a problem for the processing process, and the internal residue is residual. In the process of using the lithium-ion battery, the internal positive electrode negative short circuit occurs, thereby causing an explosion.

Another reason is that the external acupuncture or extrusion causes short circuit of the internal material, causing fire or explosion. 3, high temperature leave, if the temperature is too high, will also cause 18650 lithium ion battery explosion. Under normal circumstances of lithium battery, the temperature range is charged 0 to 45 ¡ã C; discharge -20 ~ 65 ¡ã C; storage 0 to 45 ¡ã C.

The lithium-ion battery protective plate is usually a set battery charge with a high temperature of 50 ¡ã C; discharge high temperature is 70 ¡ã C. If there is no high temperature protection, lithium battery continues to discharge or store, which will cause the explosion of lithium electricity. The internal raw material of lithium electricity will deteriorate over 120 ¡ã C, a diaphragm of the internal material of the lithium battery, the internal diaphragm of the general lithium-ion battery is more general, and the diaphragm of 120 ¡ã C will shrink, the diaphragm, such as shrinking, positive and negative material The pen will touch the short circuit, and the short circuit will cause high temperatures, and the battery safety valve will cause the battery safety valve to open the exhaust gas causes the knockout or exp.