Get to know the electric tool protection board

The ultra small PCB area of the protective board allows the BP20200T to be perfectly integrated into battery packs with limited space. Combined with the high reliability design of the circuit, it can completely replace the commonly used thermal cumulative disconnect self recovery insurance (POLYSWITCH) in current battery packs. And since the short-circuit protection is instantaneous, there is no problem of burning out the wiring that may be encountered when using POLYSWITCH. At present, with the development of new energy ships, lithium batteries are increasingly widely used in hybrid ships. Lithium batteries have many superior characteristics such as high energy, wide operating temperature range, stable operating voltage, and long storage life.

The system design of the lithium battery protection board adopts a lithium battery pack consisting of 32 strings of single 20Ah lithium iron phosphate batteries, forming a 96 V, 20 Ah battery pack. During normal use, the rated discharge current of this battery pack is 80 A, the instantaneous discharge current is 200A (5ms), the rated charging current is 10A, and the overcurrent capacity is 100A (for 90 seconds). The charging and discharging of the battery pack are controlled by the charging and discharging switch tubes K1 and K2 in the main circuit module. When the main control module detects faults such as overvoltage, overcurrent, overheating, and short circuit in the battery pack, the control circuit will disconnect the charge and discharge switch tube, cut off the battery connection to the main circuit, and protect the battery and electrical equipment. The alarm signal module is installed on the battery casing and can display the current battery level and battery system status. The system has the following functions: protection function; Communication function; Collection of battery pack voltage, charging and discharging current, and battery pack temperature; Heating plate control function; Contact control function.