BMS for Power Bank
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Bettery Management System for Power Bank
A battery management system (BMS) is a system for managing battery cells. It regulates the voltage by balancing the voltage of the cell and manages to avoid overloading the battery.
Lithium secondary batteries have a risk of rupture due to overcharging or overdischarging, which affects their function as a battery. For efficient management, the BMS is equipped with a current sensor and a temperature sensor to measure the current of the current sensor to control the charging/discharging of the battery.
It can also detect the current/voltage/temperature of the battery to predict the battery state of charge (SOC) to determine whether the battery is charging or not.
Size Weight Material Type Spec
255 x 200 x 180mm 8.4kg Aluminum case Lithium-ion 11.1v / 94Ah (1043Wh)
405 x 200 x 185mm 12kg Aluminum case Lithium-polymer 11.1v / 180Ah (1998Wh)
Purpose and usage setting
BMS(Bettery Management System) Purpose
Reuse of batteries that drive E-Mobility and demand for power banks for camping are rapidly increasing.
Focusing on the development of camping power banks rather than the reuse market of electric golf carts, AGVs, E-Mobility.
Develop a BMS for manufacturing a camping power bank using cell units of waste EV batteries.
Waste EV battery model selection
Hyundai Motors Kona waste EV battery (64KWh)
BMS specification setting for waste EV battery reuse
Battery specification : voltage 12V to 14.8V (4S 1P), electric current 100 to 180A range
Function : battery balancing, current sensor (CT) can be installed, overcharge/overdischarge blocking signal, battery temperature sensor can be installed
Available PC-based monitoring program
BMS detailed circuit configuration
① Battery voltage sensing / balancing connector
Connect in the order of the numbers marked on the PCB board
② BMS ON/OFF signal
ON/OFF control of BMS board with electric contact or switch
③ Overcharge / Overdischarge blocking electric contact
When the BMS detects overcharging or overdischarging of the battery, it outputs a cutoff signal in the form of a electric contact.
Normal state: internal contact short circuit (ON)
Overcharge/overdischarge signal generation: Internal electric contact open (OFF)
④ Main CPU communication port
Port for loading control program on Main CPU
(Used only when loading the program for the first time)
⑤ Reset button
Loading control program into the main CPU and reset port for testing
(Used only when loading the program for the first time)
⑥ DC CT (electric current sensor) port
Port for electric current sensor connection
⑦ Temperature sensor port
Measure the internal temperature of the device and shut off the output when over temperature occurs
⑧ USB port
USB port to connect to PC when using PC-based monitoring program