What are the hidden dangers of lithium-ion batteries?

Regarding automobiles, the main reason for the spontaneous combustion of power lithium batteries is thermal runaway, and the most common reasons for thermal runaway are violent collisions and system short circuits. First, let's talk about the first point, the combustion caused by collision. Just as the power bank will ignite spontaneously after a severe impact, the power lithium battery will also ignite spontaneously when impacted. Regarding lithium-ion batteries, severe deformation caused by intense collisions will cause internal short-circuits in lithium-ion batteries. The energy of the battery will release from the short-circuit point in one breath and cause local heating, which will cause the positive and negative electrodes and electrolyte to decompose. , The formation of thermal runaway. It can be said that spontaneous combustion caused by collisions is the best and also the most difficult to prevent. In current electric vehicles, the power lithium battery pack is arranged on the bottom of the car or the bottom of the trunk. These positions prevent fierce collisions as much as possible. At the same time, the design of the battery box can also protect the battery pack to a certain extent, which is why it is easy to prevent Place. Just like the traditional fuel vehicle will draw the fuel tank after a violent collision or rollover, the power lithium battery pack of an electric vehicle will still suffer a severe impact when the speed is too fast. At present, C-NCAP has made specification requirements for electric vehicle crash tests. The test standard is a frontal collision of 64km/h, which means that even if a five-star safe electric vehicle suffers a collision above this speed, the power lithium battery still has spontaneous combustion. may. The spontaneous combustion caused by the system short circuit is related to the aging and life of the power lithium battery. In order to isolate the battery pack from external rain, the tightness of the power lithium battery assembly is usually very high, generally speaking, it must pass the IP67 standard. However, as the use time increases, its airtightness will inevitably decrease, and the infiltration of rainwater will also cause the battery to short-circuit and cause spontaneous combustion. On the other hand, the aging of the battery itself will also bring a certain crisis. Affected by the service life, the aging of a single battery unit itself will affect its performance, and at the same time, it will also cause the overall consistency of the battery to become more and more different, which has a certain impact on the battery safety. In addition, due to the limitations of the manufacturing process, the impedance caused by the aging of the laser welding points of the battery pack will also cause local high temperatures and cause spontaneous combustion. It can be seen that the power lithium battery should be maintained and maintained from time to time, and the battery condition should be checked regularly. It can be seen that there are indeed a lot of potential safety hazards in power lithium battery packs, and friends who use electric vehicles should also spend some time in their daily maintenance. So how can we improve in the face of these shortcomings? Some experts pointed out that in terms of performance and safety, lithium-ion batteries may have reached the upper limit, and solid-state batteries may be the new power source for electric vehicles in the future. It is understood that solid-state batteries do not contain flammable electrolyte, so they are safer than lithium-ion batteries. At the same time, it is also more excellent in power storage. However, currently affected by costs and longevity, it may take time for large-scale popularization. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Do you know what are the disadvantages of lithium-ion batteries?