Detailed explanation of lithium battery protection circuit

Due to the chemical characteristics of lithium batteries, during normal use, the internal chemical positive reaction of the mutual conversion of electric energy and chemical energy, but under certain conditions, such as overcharging, overdischarging and overcurrent will cause the internal battery A chemical side reaction occurs. After the side reaction is intensified, it will seriously affect the performance and service life of the battery, and a large amount of gas may appear, which will cause the internal pressure of the battery to rapidly increase and then explode, causing safety problems. Therefore, all lithium batteries need a protection circuit to effectively monitor the battery's charging and discharging status, and to shut off the charging and discharging circuits under certain conditions to guard against damage to the battery. In order to ensure the safety of use, lithium batteries must have a corresponding battery management circuit to guard against overcharge, overdischarge and overcurrent of the battery during use. Lithium battery protection IC's ultra-small package and few external device requirements make it widely used in the design of single-cell lithium battery protection circuits. At present, special lithium battery protection board detectors have appeared on the market, but the price is generally high, and the IC must be soldered on the circuit board first when detecting. In actual use, several important parameters of the lithium battery protection IC that customers value most are: overcharge, overdischarge and overcurrent protection voltage, quiescent working current and power-off current, overcharge, overdischarge and overcurrent protection delay , And the output high and low levels of the OD and OC pins. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Lithium battery protection chip and principle analysis