Brief analysis of lithium battery charging and discharging process planning

Lithium battery charging and discharging process planning When the lithium battery is charged, the electric potential of the south and north poles of the battery forces the compound of the positive electrode to release lithium ions and embed them in carbon, which is a layer of negative electrode molecules. During the discharge process, lithium ions are separated from the layered carbon and recombine with the anode compound. The movement of lithium ions causes an electric current. Although the principle is simple, there are many more practical issues to consider in actual industrial processing: the positive electrode needs additives to maintain the charging activity, while the negative electrode needs to be programmed at the molecular structure level to accommodate more lithium ions; filled In addition to stability, the positive and negative electrodes between the electrolytes must have excellent conductivity, which reduces the internal resistance of the battery. Lithium batteries have the above advantages, but require higher maintenance of the circuit. During the use of lithium batteries, overcharge and overdischarge should be strictly prevented, and the discharge current should not be too large. Generally speaking, the emission rate should not be greater than 0.2c. The charging process of the lithium battery is shown in the figure. During the charging cycle, the lithium battery should check the battery voltage and temperature before charging to determine whether it can be charged. If the battery voltage or temperature exceeds the manufacturer's allowable range, charging is not encouraged. The allowable charging voltage range of each battery is: 2.5v~4.2v. When the battery is deeply discharged, the charger is required to have a pre-charging process so that the battery can meet the conditions of fast charging; then, according to the fast charging speed recommended by the battery manufacturer, it is generally 1C. The charger is charged with a constant current, and the battery voltage rises slowly. When the battery voltage reaches the set stop voltage (generally 4.1v or 4.2v), the constant current charging stops, the charging current decays rapidly, and the charging enters a full charging process. During the full charge process, the charging current gradually decays until the charging speed drops below C/10 or the charging time exceeds 0 when fully charged, and then enters the top to stop charging; when the top charge is cut off, the charger uses a very small The charging current is used to compensate the battery. After charging at the top for a while, turn off charging. 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: Why hasn't graphene batteries replaced lithium batteries?