Maintenance such as lithium ion battery safety performance and life skills

Source: 2020 - 03 - 25 21:01 hits: security and life of lithium ion battery maintenance skills? As the growth of the lithium ion battery in the global market, every year, billions of lithium ion battery is consumed, and eventually fell into consumers' hands. Lithium ion battery while brings us a lot of convenience, also hides many safe hidden trouble. In recent years, with the expansion of the wave of intelligence, more and more equipment in the direction of the expansion of information, such as TV, speakers, car, etc. , they can according to the environment, the user's habits and other aspects, and constantly improve themselves, ending their evolution, enhance the user experience. For lithium ion batteries, may face in the process of application of different application environment, some application scenarios may even more of a challenge for lithium ion batteries. We hope that we can be more intelligent, lithium ion battery based on the use of lithium ion battery environmental strategy to stop adjustment, on the one hand, to ensure the safety of the lithium ion battery, on the other hand to ensure that the lithium ion battery function and service life. 1. Smart self protection of lithium ion battery is the most basic self protection function, lithium-ion batteries, lithium-ion battery temperature now BMS system can fundamentally protection and current protection function, but it is in system level protection, lithium ion battery and intelligent planning may protect themselves at the levels of lithium ion battery, such as adding additional battery electrodes induction, add temperature reaction intelligent materials, by adding some smart structures in the lithium ion battery and material, to complete the lithium ion battery intelligent planning. 1. 1 internal short-circuit prevention programmes internal short circuit is a serious problem affecting the safety of lithium ion battery, because lithium dendrite, surplus materials such as lithium ion battery caused by short circuit, often can cause serious security problems. In order to solve the lithium-ion battery, lithium dendrite growth caused by internal short circuit accident, people developed a variety of methods to monitor the growth of lithium-ion battery lithium dendrite. Wu and others planning function of the diaphragm, for example, in the middle of the diaphragm of the traditional polymer diaphragm also participated in a metal layer, the layer of metallic lithium dendrite detector function, by monitoring the voltage difference between metal and the cathode, can complete the lithium dendrite monitoring, make the function of the diaphragm is to save the traditional diaphragm, and lithium dendrite monitoring in the end. The characteristics of the diaphragm is the middle tier of the diaphragm in sio2. When lithium dendrite growth to a certain extent, the diaphragm is breakdown, sio2 can react with metallic lithium, lithium dendrite, so as to prevent the further growth of the lithium dendrite. 1. 2 intelligence prevent the lithium ion battery overheat if the lithium ion battery overheat ( Such as external heating, heat in the process of short circuit) , will lead to the diaphragm, shorting the positive and negative, resulting in heat out of control. Traditional pp - pe- Pp composite diaphragm at low temperature, can end locking function, so as to cut the positive and negative electrode reaction, to inhibit the action of the battery overheat, but if the temperature is high, the pp layer also occurs in a shortened, the three-layer composite diaphragm is invalid. In order to solve the safety of the lithium ion battery in the case of overheating problem, Yim, etc. Common electrolyte flame retardants have been known to have a serious impact on the performance of lithium ion battery, so hard to use in the practical application. Yim, such as flame retardants was placed in a separate capsule, the capsule of the outer wall material in the electrolyte is very stable, generally will not affect the function of the lithium ion battery. When the temperature over 70 degrees Celsius, the flame retardant DMTP vapor pressure leads to shell is broken, and will be released into the electrolyte flame retardants, lead to the conductivity of the electrolyte fell sharply, to prevent further reaction inside the battery. Above the protection of lithium ion battery method is one-off, that once the protection mechanism is activated, it means the battery failure. In order to solve this problem, Yang and others designed a kind of multiple activation of protection scheme, the use of a smart electrolyte, can prevent temperature under the influence of reversible sol-gel Gel shift.