Analysis of the cause of the combustion explosion of three - dimensional lithium ion battery

　　Author ：Iflowpower – ספק תחנת כוח ניידת

With the continuous development of ternary lithium-ion battery technology, the three-yuan material with higher energy density gradually replaces the lithium iron phosphate material with better stability. Although the ternary material has brought higher energy density for the ternary lithium ion battery, its thermal stability has become a greater challenge, it is important that the high-nickel material begins to break down at 200 ¡ã C. Release O2, which also leads to a lithium-ion battery drum bag, serious or even heat out of control, developed into a combustion explosion.

Studies have shown that thermal out of control is developed into combustion explosions. It is important that the positive electrode material high temperature decomposition occurs O2 and the mixed gas existing after electrolyte gasification, and a large amount of alkane gas in which the negative electrode and the electrolyte occurred, the gas is mixed and then high temperature Self-combustion. In the experiment, the authors used two ways to trigger heat out of control.

The first is to heat, and the battery is heated by adding a hot plate under the lower part of the battery. The second way is to continuously charge the battery with charge and discharge equipment, and trigger battery heat out of control through overtaken. It can be divided into five steps: 1.

Heating, battery drum bag; 2. One end burying; 3. Another burying; 4.

Quiet combustion; 5. By testing data, when the battery is heated to 215.7 ¡ã C, the battery begins with a significant bulging and electrolyte explosion phenomenon, and one end of the battery appears in.

The other end of approximately 7s after the battery has begun to appear, and the battery has started to rupture around, and there is a fire, which has continued to 19S, the highest temperature is 720.1 ¡ã C. Then the battery enters the process of quiet combustion, this process lasted 28s.

During the entire heating process, the battery voltage is substantially unchanged until the battery is bursting, the battery voltage suddenly drops to 0V, which indicates that the battery is unmatched by detecting the voltage abnormal manner to early warning batteries. Although the three-dimensional lithium-ion battery has added many kinds of safety protection measures in use, it is still a cause of accidents that will have a self-ignition explosion in the occasion. Other knowledge information related to three yuan lithium-ion battery: Lithium iron phosphate and three yuan? Which is good for three-dimensional lithium and lithium lithium phosphate life? Which lithium iron phosphate ion battery and a three-yuan lithium ion battery are bett.