What is the basic layout and rationale of lithium-ion battery packs?

Important materials: positive electrode, negative electrode, electrolyte, barrier layout: round, square; laminated, winding form: polymer (soft packaging), liquid lithium ion (steel shell), positive electrode material accounts for 30% of the cost of lithium ion batteries-- 40%, which directly affects the energy density and performance of lithium-ion battery packs. The negative electrode material needs to be composed of a material with a lower potential related to the lithium electrode, and has a high specific capacity and good reversibility of charge and discharge, so as to maintain a brilliant size and machine invariance during the process of lithium insertion. Electrolyte Electrolyte serves the purpose of transporting charge between the positive and negative electrodes. It affects the energy density, power density, wide temperature application, cycle life, and safety performance of lithium-ion battery packs. The pore size of the barrier must be satisfactory for excellent ion permeability, strong liquid absorption and moisturizing ability, and maintain ion conductivity; at the same time, it has electronic insulation to realize the insulation between the positive and negative electrodes. In addition, it should have sufficient puncture strength and tensile strength. Mechanical properties such as tensile strength and corrosion resistance and sufficient electrochemical invariance. Currently, the more commonly used materials for lithium-ion battery packs are lithium cobalt oxide, lithium nickel oxide, and lithium manganate. The most used material is lithium cobalt oxide, which has good recurrence and convenient manufacturing. The disadvantage is that the value of cobalt compounds is more expensive. Li-ion battery pack works: Li-ion battery is a kind of secondary battery (rechargeable battery), which mainly depends on the intercalation and deintercalation of lithium ions between the positive and negative electrodes to achieve energy storage and release. 1. Lithium ions are extracted from the positive electrode lattice under the driving of the electric field during the charging process, and the electrolyte is inserted into the negative electrode lattice. At the beginning of charging, the voltage of the battery to be charged should be checked first. If the voltage is lower than 3V, pre-charging must be carried out first. The charging current is 1/10 of the set current, usually about 0.05C. After the voltage rises to 3V, it enters the standard charging process. The standard charging process is: constant current charging is performed at the set current, when the battery voltage rises to 4.20V, it is changed to constant voltage charging, and the charging voltage is maintained at 4.20V. At this time, the charging current gradually drops, and when the current drops to 1/10 of the set charging current, charging is over. 2. The discharging process is just the opposite. Lithium ions return to the positive electrode, and the electrons pass through the electrical appliances from the external circuit to the positive electrode and the lithium ion compound. When the battery is discharged, the electron e on the negative electrode runs from the external circuit to the positive electrode, and the positive lithium ion Li+ jumps from the negative electrode into the electrolyte, crawls through the winding hole in the barrier, swims to the positive electrode, and ran long ago. The coming electronics unite together. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Do you know any storage and maintenance procedures for lithium-ion batteries?