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5A Transformer Balancing Board (4 Strings – 8 Strings) Hardware Version

¥70.00¥125.00

This product is suitable for lithium-ion, lithium iron phosphate, and lithium titanate batteries, with a maximum balancing voltage difference of 0.005V and a maximum balancing current of 10A.

At a voltage difference of 0.1V, the current is approximately 1A (which will actually depend on the battery’s capacity and internal resistance).

The device stops working and enters sleep mode when the battery voltage drops below 2.7V (for lithium-ion/lithium iron phosphate batteries), and it has over-discharge protection functionality.

SKU: BT04S05A+BT08S05A
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Description

Pre-Purchase Notice:

This product is mainly used for balancing the voltage of each string in lithium battery packs such as ternary lithium, lithium iron phosphate, and lithium titanate. Before purchasing, please first check if the poor endurance is caused by excessive voltage difference in the battery pack.

Damage to the battery, excessive internal resistance, water ingress, or other such reasons will not be repairable.

The balancing board must be used in conjunction with a protection board! Some polymer batteries can also be used. Remember to consult with customer service in the official store before purchasing.

 

Product Overview

The lithium battery active balancer is specifically designed for large-capacity series-parallel battery packs, featuring comprehensive and indiscriminate balancing for the entire pack, automatic low-voltage sleep, and temperature protection functions.

The circuit board is coated with a three-proof paint, which has superior insulation, moisture resistance, leakage prevention, shock resistance, dust resistance, corrosion resistance, anti-aging, and corona resistance, effectively protecting the circuit and enhancing the product’s safety and reliability.

The circuit board is equipped with an aluminum heat sink, which has the characteristics of fast heat dissipation and low temperature rise during high-current operation.

 

Product Specifications

Parameters Model Number
BT04S05A BT04S10A BT08S05A BT08S10A
Applicable Series 3S-4S 3S-4S 4S-8S 4S-8S
Maximum Balancing Current 5A 10A 5A 10A
Applicable Battery Types NCM/LFP NCM/LFP/LTO
Operating Voltage Range 2.7V-4.5V 2.7V-4.5V 1.8-4.5V 1.8-4.5V
Balance Voltage Accuracy 5mV (Standard)
Sleep Protection Voltage NCM/LFP:2.7V;LTO:1.8V,
Other voltages can be customized
Standby Operating Current 5.5mA 6mA 6.5mA 7mA
Sleep Curren 0.1mA 0.1mA 0.1mA 0.1mA
Operating Temperature -10℃~60℃
External Dimensions 94
*
64
*
17
(mm)
94
*
64
*
17
(mm)
111
*
79
*
17
(mm)
111
*
79
*
17
(mm)

 

Product Working Principle

The battery active balancer uses amorphous transformer energy transfer, voltage difference balancing, and comprehensive and indiscriminate balancing for the entire pack. (Note: When connecting, pay attention to connect B- first, then B+.)

Balancing Current:

  1. When the balancing voltage difference reaches 0.005V, the current is approximately 10A;
  2. When the balancing voltage difference reaches 0.1V, the current is approximately 1.3A; (Note: The actual current will depend on the battery’s capacity and internal resistance!)

Working Logic:

  1. Under normal conditions, after turning on the switch, the balancing board will continue to work;
  2. When the voltage of the first string of batteries drops below 2.7V, the circuit board will enter a low-voltage protection sleep mode;
  3. When the voltage of the first string of batteries rises above 2.835V, the balancing board resumes normal operation.
Product Operation Example
Connector BL08S05A
Name Definition
A Serial Interface The balance board can be turned on and off by sending commands through the control serial port
B—B4+ B- Negative pole of the first string of batteries
B1+ Positive pole of the first string of batteries
B2+ Positive pole of the second string of batteries
B3+ Positive pole of the third string of batteries
B4+ Positive pole of the fourth string of batteries
C Dip Switch ON: Balance function is enabled / OFF: Balance function is disabled
D Dip Switch NCMLFP: Lithium-ion/Lithium iron phosphate/CN: No function

 

Factory Photo of the Product

Parameters Model Number
BT04S05A BT04S10A BT08S05A BT08S10A
Applicable Series 3S-4S 3S-4S 4S-8S 4S-8S
Maximum Balancing Current 5A 10A 5A 10A
Applicable Battery Types NCM/LFP NCM/LFP NCM/LFP/LTO NCM/LFP/LTO
Operating Voltage Range 2.7V-4.5V 2.7V-4.5V 1.8-4.5V 1.8-4.5V
Balance Voltage Accuracy 5mV (Standard)
Sleep Protection Voltage NCM/LFP:2.7V;LTO:1.8V,Other voltages can be customized
Standby Operating Current 5.5mA 6mA 6.5mA 7mA
Sleep Curren 0.1mA 0.1mA 0.1mA 0.1mA
Operating Temperature -10℃~60℃
External Dimensions(mm) 94*64*17 94*64*17 111*79*17 111*79*17

 

Product Working Principle

The battery active balancer uses amorphous transformer energy transfer, voltage difference balancing, and comprehensive and indiscriminate balancing for the entire pack. (Note: When connecting, pay attention to connect B- first, then B+.)

Balancing Current:

  1. When the balancing voltage difference reaches 0.005V, the current is approximately 10A;
  2. When the balancing voltage difference reaches 0.1V, the current is approximately 1.3A; (Note: The actual current will depend on the battery’s capacity and internal resistance!)

Working Logic:

  1. Under normal conditions, after turning on the switch, the balancing board will continue to work;
  2. When the voltage of the first string of batteries drops below 2.7V, the circuit board will enter a low-voltage protection sleep mode;
  3. When the voltage of the first string of batteries rises above 2.835V, the balancing board resumes normal operation.
Product Operation Example Connection Definition
Connector BL08S05A
Name Definition
A Serial Interface The balance board can be turned on and off by sending commands through the control serial port
B—B4+ B- Negative pole of the first string of batteries
B1+ Positive pole of the first string of batteries
B2+ Positive pole of the second string of batteries
B3+ Positive pole of the third string of batteries
B4+ Positive pole of the fourth string of batteries
C Dip Switch ON: Balance function is enabled / OFF: Balance function is disabled
D Dip Switch NCMLFP: Lithium-ion/Lithium iron phosphate/CN: No function

Factory Photo of the Product

Product Application Scenarios

ThunderLink products are suitable for a variety of scenarios, meeting the application needs of each scenario.

Precautions for Use

  1. Always follow the design parameters and operating conditions during use, and do not violate the specifications provided in this document, as this may damage the balancing board and consequently the battery pack.
  2. Anti-static measures must be taken during testing, installation, and when handling the balancing board to prevent electrostatic discharge.
  3. Be careful not to let wire leads, soldering irons, solder dregs, etc., come into contact with the components on the circuit board, as this could damage the balancing board.
  4. If any abnormalities occur during use, please stop using it immediately and return it to the manufacturer or have it repaired by a professional technician.
  5. This balancing board has undergone extensive reliability testing and is far more reliable than most balancing boards on the market. At the same time, ensuring the quality of the battery cells’ manufacturing process will help minimize the occurrence of combustion.

Safety Precautions:

Our company is committed to improving quality and reliability; however, electrical products generally have a certain probability of failure. Durability may vary depending on the environment and conditions of use. Use a design with a safety margin to avoid abnormal heating, smoking, or even personal accidents, fire accidents, and social damage due to overloading.

For more detailed usage information, please refer to the corporate technical documents in the Solutions and Cases section of the navigation bar.

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