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@Radal 05
This video explains how it works, how to choose and how to install a BMS.
0:08 Unboxing BMS 2S 20A
1:32 Block diagram BMS 1S
3:52 Block diagram BMS 2S
5:00 Block diagram BMS 3S
8:20 Assembly BMS 2S 20A
11:52 Test BMS 2S 20A
BMS 2S 20A 7.4V 8.4V 18650 Lithium battery protection board - Balance
Specifications:
- Product model: HW-391
- Charging Voltage: DC 8.4-9V
- Version: Balance, Standard
- Continuous discharge current: maximum 20A (if heat dissipation environment is not good, please reduce the use of load current)
- Continuous charging current: maximum 10A
- Applicable Choice: For lithium batteries with nominal voltage of 3.7V and charge of 4.2V (including 18650, 26650 and polymer lithium batteries), can start-up current 25A, power less than 50W electric drill, or 168W resistive load
- Product size: 48mmx20mmx4mm
Battery management system
Battery BMS, Functions and How it Works Battery Management Systems. Lithium-type batteries are usually arranged to produce the desired voltage and capacity. Because the average lithium battery voltage is 3.7V, if you want 12V, you need to install 3 pcs in series.
In order for this large battery voltage to be balanced, a system that can regulate it is needed which is called BMS. So Battery management system (BMS) is a device used for balancing, monitoring and protection of batteries arranged in series or stacked batteries. BMS is equipped with passive cell balancing, voltage sensor for each battery, current sensor, temperature sensor, protection circuit to cut off the current.
Based on the research results, BMS is able to read the battery voltage value with the largest error of 4.59%, the current value with an error of 2.002% and the temperature value with an error of 0.83%. Passive cell balancing can transfer energy and the V of the battery has decreased to a value from 0.17 V to 0.14 V. The protection circuit can terminate the battery stacking circuit under conditions of overcurrent, overheat, undervoltage and overvoltage. Overheat reading error of 20 °C and undervoltage of 0.3 V
System Battery Management systems (BMS) is a technology system that functions to maximize battery life.
For the long term, it is highly recommended that all electric vehicles or battery-powered PV mini-grid banks be installed with BMS.
Battery BMS Functions and How it Works
Some of the special functions of the BMS system include:
At this time the charger can balance the charge (charge balancing), and ensure that all cells finish charging at the same time then to prevent damage in case of overcharging.
Active balancing, in which energy is transferred from the stronger cell to the weaker cell, to ensure all cells reach their maximum discharge point at the same time.
Usually the BMS can monitor the temperature (temperature monitoring) that occurs both during the charger and at work, the aim is of course to avoid damage due to overheating.
Low-voltage cut-off, a way of isolating the battery when any cell reaches the minimum recommended voltage, this is to avoid damage due to overdischarging.