Introduction to the repair principle and assembly method of 18650 lithium ion battery

18650 lithium ion battery repair principle: repair principle 1. Long-term use of lithium ion battery metal surface will have a certain degree of oxidation, resulting in poor contact between mobile phone battery and mobile phone, lithium ion battery use time is short, and use rubber sassafras or other cleaning tools The rusty material on the surface can be removed, so that the battery and the mobile phone continue to contact. Act better. Repair principle 2. The deep discharge of the mobile phone is to achieve deeper recharging by depleting the internal electric energy, which requires some non-traditional methods. Find a way to connect your phone to a small 1.5 volt light bulb. The electricity inside the lithium-ion battery will be transferred to the small bulb until all the lights are on. The mobile phone slowly drains its power through a lower voltage. Normally, if the connection voltage of the mobile phone is lower than 3.6 volts, the mobile phone will automatically shut down. Recharge, the battery can be used for a longer time. Repair principle 3. Low temperature can change the electrolyte of the lithium ion battery and promote the chemical reaction of the newly frozen battery. The use of lithium-ion batteries is actually a charge and discharge process. During this period, the negative and positive charges in the battery collide with each other. The reason why batteries are becoming more and more impractical is that at normal room temperature, the internal energy of electrons is relatively large, so the battery is in an active state and leaks relatively frequently. When a lithium-ion battery is placed in a low-temperature environment, the microstructure of the lithium film and electrolyte on the surface of the lithium-ion battery and the interface between the lithium-ion battery and the lithium-ion battery change significantly, making the battery inactive and reducing leakage current . So after charging, the standby time of the phone will increase. The cycle life of lithium-ion batteries is approximately 600 times. If charged repeatedly, the thermal movement of the molecules will gradually destroy the internal arrangement and structure of the molecules, and the efficiency of storing charges will gradually decrease. The freezing process can easily damage the original internal structure of the battery, and the charging capacity may be improved in a short time, but long-term use may not be effective. Once the microstructure of a lithium-ion battery is destroyed, it cannot be completely restored. Long-term use of this method will accelerate the loss of mobile phone batteries. 18650 lithium ion battery pack assembly needs to understand several characteristics: 1. 18650 lithium ion battery pack is assembled by welding multiple 18650 cells in series and parallel; 2. 18650 lithium ion battery pack needs battery protection board pair Each 18650 cell is balanced and protected; 3. The voltage error between each cell of the 18650 lithium ion battery pack should be within 10 millivolts, and the difference in capacity and internal resistance should be as small as possible; 4. 18650 lithium The voltage of each cell of the ion battery pack has two conventional voltages, one is the voltage of a conventional lithium-ion battery 3.7V, the other is a lithium iron phosphate battery 3.2V; 5. 18650 lithium-ion battery pack assembly uses batteries It must be of the same type of attributes, and the new and old batteries cannot be mixed together. It is best to use batteries produced in the same batch; therefore, the following important things should be prepared for the assembly of 18650 lithium ion battery packs: 1. Determine the 18650 lithium ion battery pack to be taken seriously What is the voltage and capacity of AH; 2. Prepare the corresponding number of 18650 lithium-ion battery cells; 3. Match the appropriate lithium-ion battery protection board; 4. Welding equipment, battery cell holder, wire, battery Shell, etc. and some other auxiliary materials; 1 Statement: Some pictures and content of articles published on this site are from the Internet, if there is any infringement, please contact to delete the previous article: Introduction to the classification of lithium ion battery electric heating film