Will a lithium battery explode if it is punctured?

First, lithium ions are in a stable state and do not react with air if they are not negatively polarised. Even if lithium is removed, it is not the main cause of combustion. The reason for spontaneous combustion is due to the destruction of the battery, 1, the metal weapon caused a short circuit in the battery; 2, external damage caused by diaphragm damage resulting in short circuit of the battery. The dc short circuit generates huge heat, causing the battery to lose control of heat. When the heat loses control, the temperature will rise to more than 300 degrees Celsius within milliseconds. The main flammable material in lithium batteries is the electrolyte, which burns at about 130 degrees Celsius without flame retardants, which are found in virtually every product. The major electric vehicle accidents that have occurred are all caused by the destruction of batteries and the discharge and combustion of electrolytes. But also technical system, known as lithium ion battery roughly divided into lithium cobalt, lithium manganese, three yuan, lithium iron, etc., including lithium cobalt and three yuan thermal runaway of the temperature is below 300 degrees Celsius, about 400 degrees Celsius, lithium manganese lithium iron is higher than 700 degrees Celsius, and recently iron lithium manganese binary products, according to different doping, the thermal runaway critical in 400-600 degrees Celsius. So there's a big difference, and that's one of the reasons why iron lithium is safe. Therefore, in the national standard of lithium iron, metal acupuncture test is a must do safety test. That is to say, in line with the requirements of China's lithium iron battery, after acupuncture is not to burn and explosion. This experiment has been done a lot, and there is basically no objection, even I can continue to use some products after acupuncture. And the knife mentioned by the subject further expands the damage. I also tried this experiment (zuo) (si), and the battery did not burn or explode. In some third-party tests in recent years, the supervision agency required the battery to be dissected to see whether there is an internal parallel structure. The standard is whether there is only one battery in the unified electrolyte structure. Therefore, with iron lithium battery products in line with national standards, due to its chemical properties, as well as the added flame retardant after the protection, after cutting should not occur spontaneous combustion. Other products are not guaranteed. Of course, since I am mainly responsible for iron lithium here, I am not familiar with the standards of manganese lithium and other products, and I also hope that the industry can provide additional answers for correction. In theory, metal foreign body puncture test should be the basis of the foundation.

lithium cobalt oxide is definitely going to burn, because I've seen a row of batteries burn in front of me, which is basically what it looks like in video, but it's a little bit more spectacular. But the topic mentioned an explosion, as a result of cobalt acid lithium batteries are often like the video foil flexible packaging batteries, so there is nothing to fry, after the temperature rise at most is the soft bag burst, and then the fire smoke, such as there will be no more drastic happened (of course, there are a lot of cobalt acid lithium 18650 or other forms of packaging, the other to say). And the principle, if I remember correctly, is that lithium cobalt oxide itself doesn't react with air. I think it was the internal short circuit after the puncture that caused the temperature to rise sharply and then caused the combustion. Or the other material in the cell will react with air, hope to have more understanding to answer in detail, it is best to supplement other kinds of lithium battery.

For lithium polymer batteries, it is easy to make the positive and negative electrode sheet short circuit after the knife cut, a large amount of heat will be released in a short time, so that the gel and positive material decomposition, release gas cause explosion ~

Lithium ion batteries are much more dangerous. In addition to the above problems, the propylene carbonate, ethylene carbonate and dimethyl carbonate in the battery electrolyte are extremely easy to burn. Lithium hexafluorophosphate will not only burn, but also decompose and release phosphorus fluoride when heated, aggravating the explosion effect. At the same time, the battery membrane is generally PP or PE, are flammable ~

In addition, if the design of the positive and negative electrodes of the battery does not match, or the negative electrode's ability to absorb lithium ions is weakened after repeated cycles of the battery, the lithium ions released from the positive electrode cannot be embedded in the negative electrode completely, resulting in the lithium element in the battery. After the explosion, the battery will also burn and react with water in the air

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