At present, electric vehicles generally use lithium-ion power batteries, whose single-cell capacity and voltage vary greatly, which are prone to inconsistency during charging and discharging,

resulting in a shortened driving range of electric vehicles and affecting the service life of the battery. At present, the power battery commonly used in electric vehicles is lithium iron phosphate battery.

Since lithium iron phosphate battery is a secondary battery, inconsistency will occur during the charging and discharging process, which is due to the different internal resistance and resistivity of lithium iron phosphate battery.

In order to solve this problem, it is necessary to balance the single-cell battery to minimize its internal inconsistency as much as possible. At present, there are two common balancing methods: active balancing and passive balancing.

Active balancing refers to balancing using a circuit structure composed of a circuit and a control chip. Unlike passive balancing, active balancing does not require changing the state of any other device or component, and has the advantages of simple implementation, low cost, and no impact on the battery.

However, due to the large resistance and capacitance differences between single-cell batteries, the active balancing circuit needs to transform the voltage of each single cell to a uniform voltage value through a transformer,

which requires adding a set of power switching devices between the switch tube, transformer and control chip. In addition, since each single cell needs to be sampled and controlled synchronously, the circuit structure is more complex and the cost is higher.

Passive balancing means converting the voltage of each cell without changing the battery state, and then comparing the converted voltage values. This method is mainly achieved by detecting the difference between the voltages of each cell.

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.

FAQ

Q1. Why did we choose you?

* We can provide you with efficient after-sales service, with more than 10 years of strong technical support.

* Products have passed FCC, CE, ROHS and other international standards certification.

* We can provide you with factory price, Welcome you to visit our factory and production process.

Q2. What is your product range (type)?

*We mainly do battery management systems in the fields of power batteries, energy storage batteries and consumer batteries.

*Mainly used for LFP, Li-ino and LTO batteries.

Q3: How do I know which kind of material & type my battery is ?

*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.

Q4. Do you have minimum order requirements?

Can it be customized? What is the lead time for samples and batches?

*Our minimum order quantity is 1 piece, ODM customization is available.

* 1~3 days delivery of existing samples, 3~10 days delivery of customized samples.

Q5: What if i can't use it?

*Regular products have instructional videos, We can also support online video call guidance from engineers.

Q6. What are your terms of payment?

*We accept wire transfer and cash payment, all negotiable. Payment method :visa, mastercard, T/T, PayPal, APPLE_PAY, GOOGLE_PAY, GC_REAL_TIME_BANK_TRANSFER, RMB

Q7. How do you guarantee the quality?

* All our products are subjected to professional laboratory 100% testing, as well as repeated aging tests.

* Obtained FCC, CE, ROHS and other international standard certification.

* Provide 3 years after-sales warranty service. Free spare units for replace in 3 years.

Q8. How to choose a BMS suitable for our battery?

*Depending on the voltage and current that matches your battery, you can consult our customer service and we will provide it for you equipped with the most suitable battery management system.

Q9. How can i contact you?

*We have 7x24 hours online service, Please leave us a message online.

*You can also contact us by Email, WhatsApp, WeChat, etc(see below). We are so glad to work with you.