Lithium battery manufacturers talk about the explosion of batteries

Battery explosion is a very small probability event, but it does not mean that it will not happen. Although the safety of battery technology is relatively reliable from a technical perspective, the probability of a battery explosion in some extreme environments is arbitrary. Of course it is very high. For the battery explosion accident, then we must first understand one thing: Why does the battery explode? First of all, explosion means an instant release of pressure. This requires a sealed environment to achieve. Generally speaking, the battery is not closed in many cases. Whether it is a lithium battery or a lead-acid battery, a safety valve will be set for the abnormal increase in internal pressure during the design, even if the battery If there is an abnormal situation such as a short circuit inside, the internal pressure will be released in time, which will not cause a big risk. So since the potential risks have been considered at the beginning of the battery design, why do we often see cases of battery explosions in news reports? In fact, many cases of'battery explosion' are not directly exploded by the battery, but because the controller or the electrical system has a short circuit or a fault that causes a capacitor or other components such as Mos tubes. The explosion will produce a louder sound. Secondly, when the battery or When other parts of the vehicle burn, there is a great probability of causing more short circuits, which will trigger a vicious chain reaction, which will eventually cause a huge heat accumulation in the internal short circuit of the lithium battery, which will cause the safety valve of some batteries to fail and eventually cause the battery to explode. Another situation is that the battery charger fails to cause overcharging, and hydrogen is precipitated inside the battery. When the hydrogen and oxygen are mixed in a certain ratio, deflagration occurs. So which is the safer lithium battery or lead-acid battery? In terms of battery structure, the current lithium battery packs are basically 18650 batteries for packaging, and lead-acid batteries are basically maintenance-free lead-acid batteries with good sealing performance. If the internal pressure is too large and the safety valve is abnormal , The safety of lead-acid batteries may be more reliable, after all, the strength of the outer shell of lead-acid batteries is stronger than the steel shell of a single 18650 battery. However, if overcharge occurs, the hydrogen evolution inside the battery is serious, and the probability of deflagration will greatly increase. From the perspective of battery safety protection, 18650 batteries are designed with safety valves, which can not only release excessive internal pressure, but also physically disconnect the battery from the external circuit, which is equivalent to physically isolating the battery to ensure The safety of other batteries in the battery pack. In addition, lithium battery packs are usually equipped with a BMS protection board to directly solve the problem of overcharge and overdischarge from the root cause. Summary: The battery actually has certain risks, but as long as the battery is used in a reasonable and safe way, there is no problem. From the perspective of the safety and redundancy design of the battery, qualified lithium batteries and lead-acid batteries can fully guarantee the user's use Security, there is no obvious difference in security. However, due to the large number of low-end small electric vehicles and scooters on the market, and most of them use poor-quality lithium batteries, they are relatively more prone to accidents. This also leaves consumers with the illusion that lithium batteries are unsafe. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Lithium batteries have changed our lives, but it is not the future of electric cars