To improve the safety of the measures for lithium ion batteries have?

Source: 2020 - 04 - 12 accounted hits: improve lithium ion battery safety measures 1. Choose the raw material with high safety coefficient of the positive and negative active material, the diaphragm material and higher safety coefficient of the electrolyte. The safety of the anode materials mainly depends on the thermodynamic stability, chemical stability and physical properties of the three aspects. Diaphragm material mechanical isolation performance must be taken into account comprehensively, pore diameter and porosity, chemical stability, automatic shutdown function, heat shrinkage deformation rate is small, the thickness of the material, the physical strength, etc. The electrolyte should choose good chemical stability, good electrochemical stability, high lithium ion conductivity, liquid stability, wide range of materials. 2. Compulsory overall safety design of the battery is, the battery will be a link in the process of various materials together. It is the positive and negative, diaphragm, ears and packaging film integrated body. The structure design of battery not only affects the performance of various materials, and for the overall chemical performance and safety performance of the battery has important influence. In the design of the battery, should according to the characteristics of the material, making reasonable structure, and in the structure of the lithium battery to consider some additional protection device, such as switching element, relief valve, etc. 3. Improve the level of technology to take good care of battery production process standardization and standardization. In mixing, stirring, baking, compaction and cutting, winding, develop specifications ( Such as width, diaphragm electrolyte injection volume, etc. ) Improved process, means, Such as low pressure injection fluid method, centrifugal injection method, etc. ) And to do a good job of process control. To ensure the process quality, reduce the difference between the product: in affect security key steps in setting up special steps ( Such as depolarization burr, sweep powder, different materials of different welding method, etc. ) 。 The implementation of standardized quality control, eliminate the bad parts and products, Such as plate deformation, membrane perforation, active material, electrolyte leakage) ; Maintain a clean and tidy production field. Implement 5 s management and 6 sigma quality control. Prevent impurities and water mixed in the process of production, reduce the impact on safety accident. All kinds of lithium ion battery with its superior performance has been widely used, its security is also received widespread attention. Due to the lithium ion battery is composed of highly active the positive anode materials and organic electrolytes, violent chemical reaction under the condition of high temperature easily happened, 'thermal runaway caused by different kinds of cases is the main cause of battery dangerous accidents. Currently widely used explosion-proof valve, heat sealing film, positive temperature coefficient of resistance and other security measures. At the same time, improve the safety of the battery chemistry methods is also in the study. Usually, the combination of a variety of security measures can better improve the safety of the lithium ion battery.