Analysis of factors affecting low-temperature performance of lithium iron phosphate battery packs

1. Positive structure. Under the ultra-low temperature standard, the three-dimensional structure of the battery cathode material limits the external diffusion rate of the lithium iron phosphate battery rechargeable battery. Under the standard of -20℃, the charge and discharge capacity of the rechargeable lithium iron phosphate battery is only% of the volume at room temperature, while the nickel-cobalt-manganese ternary battery can achieve %. At -20°C, the charge-discharge volume of a lithium-ion manganate battery reaches 83% of the volume at room temperature. 2. Organic solvents with high melting point. The high melting point organic solvent in the rechargeable lithium iron phosphate battery increases the viscosity in the ultra-low temperature natural environment. When the temperature is too low, condensation will occur, thereby reducing the transmission of the lithium ion battery in the lithium ion battery electrolyte rate. Third, it is the external diffusion rate of lithium-ion batteries. The ultra-low temperature external diffusion rate of lithium-ion batteries in the negative stage of high-purity graphite is reduced; the reduction of the external diffusion rate of lithium-ion batteries on the negative stage of high-purity graphite is the key reason for the decrease of the ultra-low temperature characteristics of lithium-ion batteries. plastic film. The negative stage of the lithium iron phosphate battery rechargeable battery thickens the SEI film in the ultra-low temperature natural environment, and the characteristic impedance of the SEI film expands, which causes the conductivity of the lithium ion battery in the SEI film to decrease, and finally the lithium ion battery is in the ultra-low temperature natural environment. The charging of the lower battery appears to be polarized, and the charging efficiency of the battery decreases. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to deal with used lithium-ion batteries