Balancers are categorized into passive and active systems:

Passive Balancers: These systems level the charge by dissipating the excess energy from more charged cells as heat. This process is simpler and less costly but is not energy-efficient since the excess charge is not reused but lost.

Active Balancers: In contrast, active balancers redistribute energy from cells with a higher charge to those with a lower charge. This method not only maintains balance but also conserves energy within the battery system, enhancing overall efficiency..

Passive Cell Balancing
Passive cell balancing is entirely different from its active counterpart. In passive balancing circuit, there is no transfer of charge from the high-cell to the low-cell. Instead, all the extra energy of the high cell is dissipated in the form of heat.

This is done by adding resistors in front of the cell. The extra energy is burned till the State of Charge of the high-cell matches SOC of the low-cell.

There are two types of passive cell balancing circuits:

Fixed-Shunting Balancing
In fixed-shunting balancing, the resistors limit the maximum voltage the cells can reach. This is done to prevent any cell from overcharging. Whenever any cell reaches the maximum voltage, the extra energy supplied is given to the shunting resistor.

It dissipates this energy in the form of heat.

Switch Shunting Balancing
Switch shunting balancing works by using several switches and a voltage sensor. The voltage sensor is installed in each cell to monitor the charge levels. There are two modes- continuous and voltage sensing. The continuous mode lets the cell operate in normal working conditions.

The sensing mode turns on the voltage sensors and balances any inequality with the resistors. Switch shunting balancing is a good option for battery cells with low charging and discharging currents.

 

Technical Parameters

EnerKey BMS Active Balancer 5A 3S 4S 5S 6S 7S 8S 14S 16S 18S 19S 20S 21S LFP LTO LI-ION lifepo4 Balancer Capacitor Balancer
Product model	EK-C6S5A	EK-C7S5A	EK-C8S5A
Product strings	6S	7S	8S
Suitable strings	4-6S	5-7S	6-8S
Product Size(mm)	L69*W69*T16	L80*W69.5*T16	L91*W70*T16
Weight with box	0.16kg	0.18kg	0.19kg
Battery Type	NCM/LFP/LTO	NCM/LFP/LTO	NCM/LFP/LTO
Suitable capacity	30ah-300ah
Voltage equalization accuracy	5mV (typical value)
Balanced Cascading	Support balanced cascading for battery packs, for example , it can cascade for 11S , 24S ,36S , 48S....and so on
Single cell voltage collection range	NCM/LFP version : 2.7V-4.2V
	LTO version : 1.8-4.2V
Undervoltage protects sleep voltage	NCM/LFP version＜2.7V
	LTO version＜1.8V
Under voltage protection Start balancing voltage	NCM/LFP version: 2.835V
	LTO version: 1.89V
Equilibrium method	Patented (Patent No.: ZL 2019 1 1259513.3) balanced architecture Fit capacitor method, the entire battery pack is balanced at the same time. Connect to the battery pack for automatic balancing (default). You can add a switch to manually turn on or off balancing.
Equilibrium current	0.1V Differential pressure 1A Balanced current,
	the differential pressure is proportional to the balanced current,
	the maximum allowable operating current is 5.5A
External power supply	No need for an external power supply,
	relying on the internal energy transfer of the battery to achieve sdjacent equalization.
Quiescent operating current	7mA, the total string draws power
Sleep standby current	0.1mA(typical value)
Operating Temperature	-20℃ ~ +60℃

 

 

Packing List

 Wire connect

A single EK-C6S5A supports the use of 4 and 5 and 6 string battery packs. The wiring method is as follows:

EK-C6S5A supports cascading battery packs. Fox exmple, 2pcs of 6s cascade to 11s, see below drawing:

NOTE:As shown in the figure above,there can be multiple common ends of energy exchangeso that the efficiency of equilibrium will be higher;It is also possible to use only one common end of theenergy exchange atthejunction of two modules.The other free feet are suspended, and it is best todistribute the number of strings equally on each board.If you need the cascade diagram for more strings, Please contact our online service, Thanks.

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*Please look the battery body, If the normal voltage of your battery shows 3.2V, The battery is LiFePo4.

*If the normal voltage of your battery shows 3.6V or 3.7V, the battery is Li-ion or Lto battery.

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