Briefly describe the cause of short circuit of lithium ion battery and daily maintenance

1) The positive electrode material is impure or left in the air for too long, and the drying is not complete; the transition metal impurities in the positive electrode slurry are not cleaned, which will cause the separator to pierce the separator or promote the formation of negative lithium ion dendrites and cause internal short circuit; (2) ) Short circuit between copper/aluminum current collectors, metal foreign bodies that have not been trimmed during battery processing or use pierce the diaphragm or electrodes, and the displacement of the pole pieces or tabs in the battery package causes the positive and negative current collectors to contact; (3) The quality of the lithium ion battery cell diaphragm is not up to standard, and the lithium ion battery pack is often charged and discharged with high current during use. The diaphragm cannot withstand the huge lithium flow in a short period of time, causing local or large area damage, which directly causes the battery cell to be severely damaged. Heat, hot and damage; (4) During the cycle of lithium ion batteries, due to the low capacity of the negative electrode material to store lithium ions or the rapid release of lithium from the positive electrode, too much lithium is freed on the surface of the negative electrode, which will form branches over time When the dendrites grow to a certain length, they will easily pierce the diaphragm and cause micro-short circuit of the battery. Too low temperature also helps the growth of lithium ion dendrites, so low temperature can also cause micro short circuits in lithium ion batteries. Daily maintenance of lithium-ion batteries: 1. The newly purchased lithium-ion batteries will have a little power, so users can use them directly when they get the batteries, and then recharge the remaining power. After this 2~3 times, the normal Use it to fully activate the lithium ion battery activity. Here is a special reminder: Don’t misbelieve the rumors from the salesperson or the Internet, the new lithium-ion battery must be activated for up to 12 hours when it is first used. 2. Lithium-ion batteries do not have a memory effect and can be charged as they are used, but it should be noted that lithium-ion batteries cannot be over-discharged. Over-discharge will cause irreversible capacity loss. When the machine warns that the battery is low, it will start charging immediately. 3. In daily use, the newly charged lithium-ion battery should be put on hold for half an hour, and the charged performance is stable before use, otherwise it will affect the battery performance. 4. When the instrument is not in use, be sure to remove the battery and store it in a dry and cool place. 5. Pay attention to the use environment of lithium ion batteries: the charging temperature of lithium ion batteries is 0℃～45℃, and the discharge temperature of lithium ion batteries is -20℃～60℃. 6. Do not mix the battery with metal objects, so as to prevent the metal objects from touching the positive and negative electrodes of the battery, causing a short circuit, damaging the battery or even causing danger. 7. Do not knock, acupuncture, step on, modify, or expose the battery to the sun, and do not place the battery in microwave, high voltage and other environments. 8. Use a regular matching lithium-ion battery charger to charge the battery, do not use inferior or other types of battery chargers to charge the lithium-ion battery. 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: How often is the best time to change the battery of an electric car?