Lithium ion battery safety and protection performance test

Source: 2020 - 04 - 12 which hits: lithium ion battery safety and protection performance test summary: in today's society, people's environmental protection consciousness is more and more strong. Under the background of the pursuit of high resource utilization, lithium-ion rechargeable batteries become the focus of attention. Lithium ion battery safety and protection performance of detection is very important part of performance testing. Expounded the present status of lithium ion battery and the connotation of the performance of safety protection, analyzes the factors influencing the performances of lithium ion security protection, based on this, advances the lithium-ion safety performance testing of new ideas. Key words: lithium-ion batteries; Safety; A, the current situation of the development of lithium ion battery protection performance and safety performance of the connotation of science and technology progress has brought people life level unceasing enhancement, mobile phones have become an integral part of your belongings in people's life. Lithium ion battery as the most widely used, performance is the best mobile phone batteries, on the technical evaluation and price has great advantage. Lithium ion battery is a high energy density lithium ion as the basic material of smart battery. Can be replaced with the original charger implement a simple charging in the shortest time, at the same time keep a long life cycle and large capacity. The characteristics of lithium ion itself also has many disadvantages: (determines it 1) When high energy density is abused, it will form the thermal runaway, a lot of heat release in a short time, easy to cause explosion; ( 2) Electrolytic liquid hydrocarbons as solvents. When the external pressure of 4. 6 v, hydrocarbon oxidation reaction of organic solvent in flammable. Once the leakage solvent, lithium ion battery will fire explosion in severe cases. ( 3) Charge and discharge process can make the battery cathode material of chemical properties change, battery leads to strong oxidation. Contact with the hydrocarbon organic solvent will produce strong oxidation reaction, cause the heat accumulation, easy to heat up, out of control cause explosion. Due to use of lithium ion batteries and their security features, safety accidents caused by lithium ion battery is increasing. Due to the battery quality problem, in the import and export product recalls going on the market. The safety of the lithium ion detection should have higher requirements, to ensure the quality of lithium ion batteries on the market, reduce the occurrence of safety accidents. Ii. The influential factors of the lithium ion battery safety performance and to evaluate the safety of lithium ion battery is refers to the initial disturbance caused by the mechanical energy, thermal energy, light energy, etc. Inhibition of unsafe behavior. The influencing factors of safety can be divided into internal factors and external factors. ( 1) The influence factors of lithium ion battery safety and protection of 1. Internal factors of the positive material, negative material, electrolyte and diaphragm material will affect the safety performance of lithium-ion batteries. Lithium ion anode materials is usually embedded compounds. The positive materials will occur under high temperature, thermal decomposition. Under the condition of the high voltage overcharge, lithium ion will escape from the anode material, heat, cannot be ruled out, leading to heat loss. Cathode material easy accumulative lithium dendrite formation, the diaphragm punctured, easy to form a combustible gas. Lithium ion batteries used in the organic electrolyte, it's easy to burn. If the diaphragm material is not stable, spotted, easily punctured, positive electrode short circuit. 2. External factors, external factors are usually severe overcharge, over discharge, local temperature is too high or battery internal short circuit, etc. , all of these are caused by human improper operation. Human abuse of lithium ion battery can lead to fire and explosion accidents. ( 2) The influence factors of lithium ion battery safety and protection evaluation factors, which affect the lithium ion battery safety performance a lot. Only to analyze the genetic composition of complex systems, and to understand how to build key detection technology.