Lithium battery protection board is the charge and discharge protection of lithium battery pack connected in series; it can ensure that each monomer battery voltage difference is less than the set value (plus or minus 20 mv) during charging, and realize that each battery monomer battery balance charge, which effectively improves the charging effect of serial charging mode; At the same time, detect every single battery in the battery pack of overvoltage, under voltage, over current, short circuit, over temperature condition, protect and extend the service life of the battery; Under-voltage protection makes every single battery in discharge avoid damaging during using because of over dischargeFinished products of lithium battery mainly has two parts, and protection of lithium battery core board, lithium battery core is mainly composed of positive plate, diaphragm, negative plate, electrolyte composition; Positive plate, diaphragm, negative plate coil or cascade, packing and infusion liquid electrolyte, after packaging made from batteries, lithium battery protection board a lot of people don't know, the effect of lithium battery protection board, just as its name implies is to protect lithium batteries, lithium battery protection board's role is to protect the battery but put, but filling, but flow, and the output short circuit protection.