Explosion-Proof Cell Technology For Lithium-Ion Battery

The progress of human society can not be separated from the efforts of all walks of life in society, a variety of electronic products can not be updated without the efforts of our designers, in fact, many people will not go to understand the composition of electronic products, such as lithium-ion batteries explosion-proof core.

Lithium-ion batteries have become the battery of choice for portable electronic devices. The batteries, with their high capacity density and competitive prices, are expected to remain the dominant market for years to come. But lithium-ion batteries always carry the risk of explosion. As applications rise, so do explosions. In fact, lithium-ion batteries are very safe through proper battery system design and battery charge determination. With the current maturity of explosion-proof circuits and explosion-proof core technology, explosions should become less and less common.

When a short circuit occurs on the outside of the battery and the electronic components are unable to disconnect the circuit, a large amount of heat will occur inside the battery, which will cause some of the electrolyte to evaporate and expand the battery case. When the internal temperature of the battery reaches 135 degrees Celsius, high quality diaphragm paper will block the holes, the electrochemical reaction will be terminated or almost terminated, the current will drop dramatically, and the temperature will drop slowly, thus preventing an explosion. However, the closure rate of the holes is too poor, or the holes will not be closed at all, the battery temperature will continue to rise, more electrolyte will evaporate, and eventually the battery case will rupture, or even the battery temperature will rise to the point where the substance will burn and explode. A significant cause of internal short circuits is burrs in the copper and aluminum foils puncturing the diaphragm, or dendritic crystals of lithium atoms puncturing the diaphragm.

To prevent lithium-ion battery fire and explosion, the first is the quality control of the battery. The current battery system can be completely through the single battery in the material modification and electrolyte additives, as well as excellent battery pACK process and efficient battery management system to minimize the possibility of battery fire. In particular, some high-end electric vehicles, due to the use of a variety of means to ensure the stable operation of the battery, very few battery fire accidents.

Lithium cells should also have a lower voltage limit when discharged. When the voltage of the battery cell is lower than 2.4V, some of the materials will start to be destroyed. And because the battery will self-discharge, the longer you put the voltage will be lower, therefore, it is best not to discharge to 2.4V before stopping. The energy released during the period from 3.0V to 2.4V only accounts for about 3% of the capacity of a lithium-ion battery. Therefore, 3.0V is an ideal cut-off voltage for discharge.

When charging lithium-ion batteries, the upper limit of the charging voltage and the lower limit of the discharging voltage must be set. The ideal values are 4.2V and 2.4V, so that life, capacity and safety can be considered at the same time; in addition, the upper current limit is also very necessary. Therefore, the protection of lithium-ion batteries must include at least the following three items: the upper limit of the charging voltage, the lower limit of the discharge voltage and the upper limit of the current. Usually, in the lithium-ion battery pack, in addition to lithium-ion battery cells, there will be a protection board, important to supply these three kinds of protection. However, it is clear that these three protections of the plate are not enough, and lithium-ion batteries are still frequently exploding all over the world. In order to ensure the safety of the battery system, the causes of battery explosions must be more carefully analyzed. Lithium-ion battery protection should include the upper limit of the charging voltage, the lower limit of the discharge voltage and the upper limit of the current. Usually, in a lithium-ion battery pack, in addition to the lithium-ion battery cells, there will be a protection board, important to supply these three protections. However, these three protections of the protection board are obviously not enough. Lithium-ion battery explosions are still frequent worldwide. In order to ensure the safety of battery systems, the causes of battery explosions must be analyzed more carefully.