1. Introduction
This manual provides detailed instructions for the proper use, installation, and maintenance of the Aideepen 2S 10A 18650 BMS Lithium Battery Protection Board. This board is designed to protect 2-cell (2S) Li-ion/Lipo battery packs, ensuring their longevity and safe operation by managing overcharge, over-discharge, and short-circuit conditions. Please read this manual thoroughly before use.
2. Safety Information
Important Safety Warnings:
- This protection board is not suitable for lithium iron phosphate batteries, hernia lamps, hand drill battery packs, electric fish battery packs, electric bicycle battery packs, 775 (4A) motors, or 1W fish eye LED lights.
- Ensure that the battery pack's voltage, capacity, and internal resistance are well-matched for optimal performance and safety.
- The battery voltage should be approximately 3.7V (rated voltage) for proper operation.
- If the battery pack does not output voltage after assembly, it can be charged with an 8.4V charger to activate the protection board.
- Always observe correct polarity when connecting the board to batteries and charging/discharging circuits. Incorrect wiring can damage the board and batteries.
- Handle with care to avoid electrostatic discharge, which can damage electronic components.
3. Product Overview
The Aideepen 2S 10A BMS is a compact circuit board designed to provide essential protection for 2-cell series lithium-ion or lithium-polymer battery packs. It includes features such as overcharge protection, over-discharge protection, and short-circuit protection, along with a balance function to maintain cell voltage equality.
Package Contents:
- 5 x Aideepen 2S 10A BMS Protection PCB Boards
Key Features:
- Overcharge Protection
- Over-discharge Protection
- Short Circuit Protection (requires charge recovery)
- Balance Function for cell voltage equalization
- Compact design for easy integration
Figure 3.1: Top-down view of the Aideepen 2S 10A BMS board, showing components and connection points.
Figure 3.2: Physical dimensions of the BMS board, measuring 46.7mm (1.84 inches) in length and 23mm (0.9 inches) in width.
4. Specifications
| Parameter | Value |
|---|---|
| Overcharge Voltage Range | 4.25-4.35V ± 0.05V |
| Over-discharge Voltage Range | 2.5-3.0V ± 0.05V |
| Upper Working Current | 10A |
| Upper Limit Instantaneous Current | 20A |
| Quiescent Current | Less than 10µA |
| Internal Resistance | Less than 300mΩ |
| Charging Voltage | 8.4V-9V |
| Operating Temperature | -40°C to +50°C |
| Storage Conditions | -40°C to +80°C |
| Effective Life | More than 50,000 hours |
| Dimensions | 46.7 x 23 x 3.15 mm |
5. Setup & Installation
Careful wiring is essential for the correct and safe operation of the BMS board. Follow the diagram and descriptions below precisely.
Wiring Diagram:
Figure 5.1: Diagram illustrating the connection of two 18650 cells to the BMS board.
Welding Point Description:
Figure 5.2: Close-up view of the BMS board highlighting the welding points and their corresponding connections.
- B+: Connect to the positive terminal of the battery pack.
- B-: Connect to the negative terminal of the battery pack.
- BM: Connects to the connection point between Battery 1 and Battery 2 (for balancing).
- P+: Connect to the positive terminal of the charge/discharge circuit (shared).
- P-: Connect to the negative terminal of the charge/discharge circuit (shared).
Note: Ensure all connections are secure and properly insulated to prevent short circuits. Double-check polarity before applying power.
6. Operating Instructions
Once the BMS board is correctly wired to your 2S battery pack, it will automatically manage the charging and discharging processes, providing protection against common battery issues.
Charging:
- Connect an appropriate 8.4V-9V charger to the P+ and P- terminals.
- The BMS will monitor the individual cell voltages and terminate charging if any cell reaches the overcharge voltage range (4.25-4.35V).
- The balance function will work to equalize the voltage between the two cells during charging.
Discharging:
- Connect your load to the P+ and P- terminals.
- The BMS will cut off discharge if any cell reaches the over-discharge voltage range (2.5-3.0V) to prevent battery damage.
- The maximum continuous discharge current is 10A, with an instantaneous peak of 20A. Exceeding these limits may trigger protection.
Figure 6.1: An example setup showing the BMS board connected to a 2S battery pack and a charging module with a display.
7. Troubleshooting
- No Output Voltage after Assembly:
If the battery pack does not show output voltage after initial assembly, connect an 8.4V charger to the P+ and P- terminals. This will typically activate the protection board and restore output.
- Short Circuit Protection Triggered:
If a short circuit occurs, the board will cut off output. To recover, remove the short circuit and then connect a charger to the P+ and P- terminals to reset the protection.
- Battery Pack Not Charging/Discharging Properly:
Verify all wiring connections, especially B+, B-, BM, P+, and P-. Ensure that the battery cells are healthy and their voltage, capacity, and internal resistance are matched. Check if the charging voltage is within the specified 8.4V-9V range.
- Overcharge/Over-discharge Protection Constantly Triggering:
This could indicate an issue with the battery cells themselves (e.g., unbalanced cells, degraded capacity) or an incorrect charging/discharging setup. Check individual cell voltages and ensure they are within safe operating limits.
8. Maintenance
- Keep the BMS board clean and free from dust and moisture.
- Avoid exposing the board to extreme temperatures outside its operating and storage ranges.
- Regularly inspect wiring for any signs of damage or loose connections.
- Store the board in a dry, anti-static environment when not in use.
9. Warranty & Support
For technical support or warranty inquiries, please contact Aideepen customer service through your original point of purchase. Please have your model number (70127595) and purchase details ready.
