The external factors influencing the lithium ion battery safety is analysed

Source: 2020 - 04 - 11 19:05 hits: the external factors influencing the lithium ion battery safety. One is the overcharge, over discharge. Overcharge or overdischarge easy to cause the lithium ion battery cathode material or electrolyte decomposition, the release of gas and heat, make a battery, the internal pressure has risen sharply, even produce smoke, fire and explosion. The second is external short circuit. External short circuit caused by improper operation or malfunction protection circuit of positive and negative short circuit, short circuit, battery discharge current is very big, make the battery heat, high temperature can make the cells of the diaphragm shrinkage or completely destroyed, causing the battery internal short circuit, leading to explosion; Three is the temperature too high. High outside temperature can cause deformation of the metal shell, battery internal diaphragm material of melting, the positive and negative or electrolyte decomposition and so on, these are easy to cause short circuit of the battery. Mobile power supply using polymer battery polymer battery safer than lithium battery. Polymer battery pack is usually aluminum-plastic film, short circuit or other abnormalities, internal flatulence, break through the hot melt discouraged, general won't be an explosion accident, but when the battery internal short circuit generates a smoldering fire phenomenon is serious, so the battery itself didn't explode, explosion caused by burning, because the other components of the battery. ( A) The internal factors influencing the polymer battery safety. Polymer lithium ion battery short circuit has two forms: one is the battery in the process of film and flexible packaging, the positive and negative charge fluid breakthrough electrolyte membrane to form a short circuit. Another kind is in the process of battery charging and discharging cycle, because the electrode active material and electrolyte membrane material itself caused by the chemical changes between local electrical conduction, known as chemical short circuit. ( 2) The external factors affecting polymer battery safety. One is the overcharge, over discharge. Don't match the charger and mobile power is easy to cause the battery overcharge, increase the possibility of a polymer lithium ion battery expansion. When the battery charge and discharge, the battery is on the rise, the activation process of gas expansion, the battery internal pressure, the pressure reaches a certain degree. Second, the sealing side protection. Sealing side of aluminum-plastic composite sandwich made of pure aluminum thin film packaging material, has the good electrical conductivity. When use, reliable insulation and isolation measures must be taken, to prevent short circuit between it with external components, this may lead to corrosion and gas in the battery. 3 it is the external short circuit. The positive (of the battery Or negative) Lu: su composite membrane with battery outer aluminum layer of short circuit. With the application of mobile power supply is more and more widely, people demand for mobile power supply capacity and safety of more and more is also high. In the capacity of the mobile power supply at the same time, how to guarantee the security of mobile power supply become the designer's problems. Believe that with the progress of materials technology and people to the understanding of the design, manufacture and use of mobile power supply, the large capacity of mobile power supply in the future will be more secure.