Whether it is a mobile phone or a balance car, there has been an explosion. Why is the culprit always the battery? "MIT Technology Review recently published an article stating that we have not used a lithium-ion battery better than 40-year-old energy storage equipment, which means that the lithium battery is the best battery currently. However, the technology is so advanced, the lithium battery still explodes from time to time, which makes it difficult for us ordinary people to understand.

　　But don't worry too much, because the trend of lithium ion makes lithium ion batteries have higher energy density, power density, better cycle performance and reliable safety performance.

　　Battery is not the culprit, high temperature is terrible

　　If you want to understand why lithium batteries are always the perpetrators, you must first know the structure of lithium batteries. The two ends of a lithium battery are divided into positive and negative poles, with electrolyte in the middle, and the voltage flows through the electrolyte to bring lithium ions from one end to the other. This is the process of charging and discharging.

　　Now that the battery technology is so advanced, why does the balance car explode the structure of the lithium battery?

　　Usually this process will not cause any problems, but when a problem occurs, it will produce great consequences at a very fast speed. As for what will be the problem? One of the common problems is that overcharging causes the battery to overheat, and even further chemically changes the positive electrode, which may eventually catch fire or explode. Don't think that battery overheating will only happen when overcharging. Similarly, overdischarging will also happen the same accident, because the negative electrode contains oxides, which will chemically react with the electrolyte, and then release heat. Inferior batteries may also cause the above reaction because impurities run into the electrolyte.

　　Dangerous temperature that cannot be withstood in life. Overheated battery explodes

　　Don’t underestimate the problem of battery overheating, because overheating will cause the reaction to accelerate. Once the temperature continues to soar to 150°C or more, it is likely to catch fire in your pocket or bag.

　　Now that the battery technology is so advanced, why the balance car will explode. Inferior lithium batteries are prone to overheating

　　As for when the lithium battery might overheat? It's hard to tell. Some lithium batteries that are of poor quality or have problems, or are improperly used, are likely to be severely overheated the first time they are charged or discharged; and some may weaken as the number of charge and discharge cycles increase, leading to overheating. Whether it is the positive or negative electrode or the electrolyte, as long as there is a little problem, it may cause a catastrophe, which may also be the cause of the explosion of the originator Segway balance car.

　　It stands to reason that any balance scooter or mobile phone manufacturer will have this measure to avoid battery overheating causing fires or even explosions. Of course, the originator of the Segway balance scooter is no exception, and more and more balance scooter explosions occur frequently. What happened? problem?

　　Why did China's smart balance car be beaten back by the American big stick? A problem with the safety protection mechanism eventually led to an explosion

　　The battery itself usually has a protective circuit chip to prevent the battery from being overcharged or over-discharged. However, for the stability of the battery, many manufacturers will invisibly add a protective device outside the battery. This layer of protection is like covering the battery with a quilt. The heat generated by the battery cannot be transferred and dissipated during charging. This design is not the main reason, but it will also have a certain impact.

　　Now that the battery technology is so advanced, why does the balance car explode the chip of the protection circuit?

　　The most important thing is that the chip that protects the circuit does not seem to be effective, otherwise so many explosions would not happen.

　　Many people have been thinking, why not invent a battery that will not overheat? Of course, it may be difficult to keep the battery from overheating, but at least scientists have already moved in this direction. Researchers at Stanford University devised a mechanism. They invented a membrane. If the battery overheats, the membrane will continue to expand until it covers the negative electrode and blocks the current.

　　When we keep emphasizing the battery capacity and the endurance of the balance car, do we ignore the safety of the battery at the same time? This may be a question that all balance scooter manufacturers should think about.