BMS charge-discharge controller for 2 Li-Ion batteries 18650 HX-2S-D20 13/20A 7.4V

BMS (Battery Management System) is a battery management system that is designed to monitor the condition of batteries, control the process of charging / discharging batteries, etc.

Two batteries (18650) can be connected to the charge-discharge controller module HX-2S-D20 at the same time. The module has protection against short circuit, overcharging and overdischarging. One of the functions of the charge controller is to turn off the power supply to the batteries when the maximum capacity of at least one battery is reached. This BMS controller is designed for more than 30,000 hours of operation. The maximum allowable current is 20 A.

The battery charge-discharge controller module HX-2S-D20 has 5 outputs:

B+: battery positive
B-: battery negative
BM: battery assembly midpoint
P-: charge/discharge negative terminal
P+ charge/discharge positive terminal

If the maximum allowable value of the supply voltage is exceeded, the charge controller activates the "protection" mode. In order to restore the operation of the module, it is necessary to re-apply voltage to the BMS board input or wait for some time until the charge controller turns off the protection automatically.

Power is supplied to the module from an external power source. The module supply voltage range is from 7.4 to 8.4 V. For charging, you can use a boost converter with a current limiter.Please note that this module is not a charger.

Module Specifications:

Model HX-2S-D20
Maximum battery charge voltage, V 4.25 ... 4.35
Battery discharge voltage, V 3.2
Supply voltage, V 7.4 ... 8.4
Operating current, A 13
Maximum operating current, A 20
Operating temperature, °C -40 ... +50
Module dimensions, mm 46 x 20 x 3.6.