Requirements for the safety performance of lithium-ion battery barriers

The mechanical function of the barrier is an important factor affecting its application. If the barrier is split, a short circuit will occur and the product rate will be reduced. Therefore, the barrier must have a certain machine strength in the process of battery assembly and charging and discharging layout utilization. The mechanical strength of the barrier can be weighed against puncture resistance and tensile strength. The tensile strength and the tensile strength of the barrier are related to the process of making the film. In the recovery of uniaxial stretching, the strength of the film is different in the stretching direction and the vertical direction; while in the recovery of biaxial stretching, the gap in the two directions will be close. Generally, the tensile strength mainly means that the longitudinal strength should reach more than 100MP, and the lateral strength should not be too large. Too much will lead to an increase in the transverse shrinkage rate. This shrinkage will increase the chance of lithium-ion battery manufacturers' positive and negative electrodes fighting. Puncture resistance, puncture resistance refers to the mass of a sample applied to a given needle to break through the barrier, and it is used to imply the tendency of the barrier to short-circuit during the assembly process. Because the barrier is sandwiched between the uneven positive and negative plates, it will suffer a lot of pressure. In order to prevent short circuits, the barrier must have a certain puncture resistance strength. The puncture resistance value is generally 300-500g. 2. Transmission function The transmission function can be used under certain time and pressure, and is characterized by the amount of barrier gas, which mainly reflects the patency of lithium ion penetration barrier. The size of the barrier permeability is the effect of the comprehensive factors affecting the internal pore layout of the barrier, such as the barrier's porosity, pore size, pore shape, and pore tortuosity. After several years of growth, my country's lithium-ion battery barrier has made great progress and has become one of the world's important producers of lithium-ion batteries. The safety and environmental protection requirements of lithium-ion batteries are getting higher and higher. As an important part of the lithium-ion battery, its safety function is also one of the important considerations in the lithium-ion battery industry. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.