What are the hidden dangers in lithium ion batteries?

Source: 2020 - 03 - 24 'hits: time potential danger of lithium ion batteries is what? What is the future development direction of power battery? Recently, tesla's accident cause things to happen again, such as vehicle fire new energy car battery again facing the wind and waves. Replace the engine as power battery car 'heart', it is closely related to the function of the function, battery technology advances, auto range gradually improve, charging time began to become shorter, but the uncertainty of the resulting battery safety has become a threat to hinder the development of electric vehicles. Lithium-ion batteries, lithium ion battery is the most mainstream on the market at present, it is widely used in electronics and cars, the applicability and reliability of withstand test. However, due to some design and even its own characteristics, the influence of battery spontaneous combustion has occurred in history, such as samsung mobile door, so the battery safety problem is certainly worth our attention. For motor, power battery is the main reason of the spontaneous combustion thermal runaway, the violent collisions is the most common cause of thermal runaway, system short circuit, etc. First of all, let's talk about the first point, incineration of collision. Charging treasure to automatically ignite after violent collisions, power battery will automatically ignite after the collision. For lithium ion batteries, the violent collision caused by the severe deformation can form in lithium ion battery internal short circuit. Battery energy release of relief from the short circuit point, component parts, lead to the anode, cathode and electrolyte decomposition and formation of thermal runaway. Collision caused by spontaneous combustion, as it were, is the best, is also the most difficult to prevent. In today's electric vehicle power battery placed in the car or at the bottom of the trunk, can avoid the violence, battery shell is designed to protect the battery pack to a certain extent, it is easy to prevent. Just like traditional fuel vehicles can ignite fuel tank after the violent collision or overturned, power battery electric cars can be hit so hard when driving too fast. Now the c - Ncap has been put forward for electric vehicle crash test standard, test standard is 64 km/h before the collision, which even five-star safety electric cars, collision over the speed, power battery still exists the possibility of spontaneous combustion. The system short circuit caused by spontaneous combustion is associated with the aging and life of the power battery. In order to stop the outside rain into battery, power battery components are usually very dense, general need IP67. But with the increase of time, its sealing is bound to decline, the introduction of rainwater can also lead to the battery short circuit, caused by spontaneous combustion. The battery itself, on the other hand, the aging also can bring the inevitable crises of. In life, under the influence of single cell battery aging will affect its function itself, at the same time also can make the battery consistency worse and worse, it will inevitably affect the safety of the battery. In addition, as a result of the limitation of the production process, the battery pack of laser welding point impedance caused by aging can also cause high temperature part, cause spontaneous combustion. It can be seen that power battery also need regular maintenance and maintenance, regularly check the battery status. The security hidden trouble of power battery, therefore, do a lot of, use of electric cars friends also need to spend some of idea in the daily maintenance. So, what can we do to solve these shortcomings? Experts said that the lithium ion battery in function and safety may have already reached the limit, solid-state batteries could become the future electric car of new energy. Solid-state batteries do not contain flammable electrolytes, therefore safer than lithium ion batteries. It is also better able to store electricity. But now affected by cost and life of the mass communication could take time. At the same time, Japan is developing all the resin batteries may have a market. It will contain the gel electrolyte resin lithium electrode materials such as package, drilling, cutting surface will not fire, cost than traditional lithium-ion battery is slightly low, worth waiting for.