How to solve the problem lithium power battery life attenuation ?

Limited driving distance is when the choose and buy new energy vehicles is considered a key indicator, is also the important factor of the relevant departments to formulate policies, therefore, the new energy car companies of high specific energy Lithium power battery more preference, under the help of the three, high specific energy power the lithium battery gradually into the mainstream.

However, the current technology under the condition of high energy lithium power the battery life decay quickly,Lithium electricity do not match the cycle life and vehicle mileage life pool, the calendar life of lithium-ion batteries do not agree with the vehicle use fixed number of year, this gives a lot of frustration in the promotion of new energy vehicles.

Why high specific energy Li-ion battery life decay faster?

From microscopic view, lithium battery in the process of using, electrolyte decomposition, active material can occur within the deactivation, positive negative structure collapse into lithium ion embedding and reduce the number of embedded etc as irreversible electrochemical reaction and led to the decrease of the capacity.

Especially under the condition of high voltage and high temperature, high take off easy to react with the electrolyte of lithium anode surface, for example, the charging state NCM811 the activity of the reaction with electrolyte, far more than the activity of NCM111 react with the electrolyte.Therefore, the higher the charge and discharge voltage, the higher the temperature, the faster the lithium battery capacity decline.

From the macroscopic view, how to accurately measure current, voltage and temperature, thermal management and power management and power management?How to perceive High specific energy power lithium battery life state, prolong its service life?There is no doubt that the battery management system play an important role.

From different dimensions explore solutions

About NCM811 such as high specific energy attenuation fast Lithium power battery life problem, at present, a lot of industry solutions from material, electrolyte, diaphragm and battery management system and other aspects.

Material, can be modified through the NCM811 particle surface processing, improve its performance.Due to the different electrolyte additives, polarization degree and speed of polarization of the battery is different also, therefore, can reduce cell internal parasitic reaction of the electrolyte, can improve the ratio of energy Lithium power battery cycle life and safety.

Great energy through the application of ceramic and polymer multifunctional composite coating, increase the ratio of energy Lithium power battery under high temperature and high pressure stability and security;In addition, the great energy also developed silicon carbon negative for process system and the electrolyte, raise the first effect of the battery to 86% and above, to solve the problem of the rapid attenuation of the 50 weeks before the battery, improve the capacity of the battery and the experimental life.

In the battery management system level, tongji university professor xue-zhe wei, vice President of the institute of automobile is proposed based on the "electricity - hot - life" optimized design method of coupling model of the battery pack can be to estimate the battery monomer, the measurement of impedance, the capacity, more space and time dimension data.At the same time, the design can ensure the consistency of the battery pack, implementation factors and physical field coupling.According to professor xue-zhe wei introduces, this is the life estimation, prediction and management as the core of the third generation of battery management system (the first generation of battery management system with single safety monitoring as the core, the second generation of battery management system based on SOC estimation), the management system has a complete series parallel solutions, balanced and thermal management solutions, for high lithium power battery life energy attenuation for effective management.

Under the pull of market demand, Thornton, new energy, the porch high-tech, such as great energy battery enterprises were opened to the layout of the high energy power lithium batteries, also known as shanshan stock materials such as enterprises, in the upstream of prepared layout accordingly.The industry of high lithium power battery life energy attenuation problem of exploration, undoubtedly promotes the development of lithium power battery industry, conducive to the further promotion of new energy vehicles.

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