Description

21S 5A Li-ion LiFepo4 Battery Active Equalizer BMS.

Heltec 21s

DESCRIPTION:

This is a 21S LiFePo4/lithium-ion 5A equalizer used for 72V battery pack.
This device acts as a balancer/equalizer to balance the capacity of cells inside 72V battery pack.
This is not a Bluetooth balancer/equalizer.
This can be used in lithium batteries of any type including 18650/21700/32650/38120/66160 and any type of prismatic cells etc.
This can be used in lithium battery applications including solar, RV, Electric bikes, Skate board, camping, Boat, Power tools, Lawn moving and household energy storage systems.
This can be used for 21S battery pack configuration.
This is manufactured by Heltec.

There are two different types of Battery equalizers:

Passive Battery Equalizer or balancer(Passive balancers)
Active Battery Equalizer or balancer(Active balancers)
The active battery equalizer in this method the battery equalizer have inductor or capacitors to balance the batteries they will use using their extra energy that stores in the battery with higher voltage to charging the other battery that has lower voltage so the active battery equalizer has higher efficiency than the passive type but it is expensive.

Technical index	Product model
	4s	6s	8s	14s-16s	16s-21s
Applicable string number	3/4s	5/6s	7/8s	The same	The same
Applicable battery type	LI-ION/LIFEPO4(LITHIUM IRON PHOSPHATE)/LTO cells
Working range of signal voltage	2.0 to 4.5V
voltage equailization accuracy	5mv(typical)
Under voltage protection sleep	When the adjacent voltages vary to 0.1V then the balancer/equalizer will active until voltages of the adjacent cells are equal, Otherwise balancer is in Off position.
Product size(mm)	555016	805016	1055016	1159725	14511318
Working environment temperature	10 ͦ C-60 ͦ C
External power	Without external power supply, the whole group is balanced by energy transfer.