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.
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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 |
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| 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:
- When the balancing voltage difference reaches 0.005V, the current is approximately 10A;
- 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:
- Under normal conditions, after turning on the switch, the balancing board will continue to work;
- When the voltage of the first string of batteries drops below 2.7V, the circuit board will enter a low-voltage protection sleep mode;
- When the voltage of the first string of batteries rises above 2.835V, the balancing board resumes normal operation.
| Product Operation Example |  |
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|---|---|---|---|---|
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| 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
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| 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:
- When the balancing voltage difference reaches 0.005V, the current is approximately 10A;
- 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:
- Under normal conditions, after turning on the switch, the balancing board will continue to work;
- When the voltage of the first string of batteries drops below 2.7V, the circuit board will enter a low-voltage protection sleep mode;
- When the voltage of the first string of batteries rises above 2.835V, the balancing board resumes normal operation.
| Product Operation Example | Connection Definition | ||||
|---|---|---|---|---|---|
|
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|
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| 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
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Product Application Scenarios
ThunderLink products are suitable for a variety of scenarios, meeting the application needs of each scenario.
Precautions for Use
- 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.
- Anti-static measures must be taken during testing, installation, and when handling the balancing board to prevent electrostatic discharge.
- 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.
- 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.
- 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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