Li-ion battery protection board has two design methods, namely positive plate and negative plate. The principle and purpose are the same. Because the lithium-ion battery protection board is directly connected to the power supply, when some devices are started, the large current through the main circuit of the lithium-ion battery protection circuit will have a great impact on the circuit. If some wiring designs are weak, you will face the risk of damaging the circuit board.

　　The number of single lithium-ion battery protection chips is determined according to the number of lithium-ion battery cells, and connected in series to protect the charging and discharging, corresponding to the over-current and short-circuit status of a single lithium-ion battery. While charging and protecting, the system controls the switching of the shunt discharge branch switch device through the protection chip to realize balanced charging. This method is different from the traditional method of achieving balanced charging at the charger end, and reduces the cost of design and use of lithium-ion battery pack chargers.

　　As the country vigorously develops new energy sources, many companies use lithium-ion batteries to replace the original lead-acid batteries and nickel-metal hydride batteries. Due to the activity of the lithium ion, the lithium ion battery protection board must be added to the lithium ion battery to prevent the lithium ion battery from overcharging and overflowing.

　　The design of the lithium-ion battery protection circuit can meet the protection requirements of series-connected lithium-ion battery packs, with complete protection functions, reliable overcharge and overdischarge protection, and balanced charging functions.