1. Introduction
This manual provides essential information for the safe and effective use of the daier 3S 11.1V 12.6V 25A Li-ion Battery PCB Protection Board. This board is designed to protect 3-series (3S) lithium-ion battery packs, such as 18650 cells, from common issues like over-charging, over-discharging, and short circuits, while also providing balancing functionality.
2. Safety Information
Read all safety warnings and instructions carefully before installation and use. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Professional Knowledge Required: Installation and wiring of this module require professional knowledge of electronics and battery systems. If you are unsure, seek assistance from a qualified professional.
- Avoid Short Circuits: Do not deliberately short circuit the board or connected battery terminals. This can cause damage to the board, batteries, and pose a fire hazard.
- Battery Matching: When connecting batteries in a 3-series configuration, ensure that the voltage of each individual battery cell is as close as possible. If voltages are not uniform, charge each cell individually to balance them before connecting to the protection board.
- Do Not Mix Batteries: Avoid mixing new and old batteries, or batteries with significantly different internal resistances or capacities. Using mismatched batteries can lead to imbalance, reduced performance, and potential safety risks. The internal resistance of the 3 battery cells should be as close as possible for optimal performance and safety.
- Initial Charge: After completing all wiring connections, the battery pack must be charged first to activate the protection board and enable output.
- Operating Environment: Use and store the board within the specified temperature ranges to prevent malfunction or damage.
3. Product Overview and Features
The daier 3S Li-ion Battery Protection Board is a compact and efficient solution for managing 3-series lithium-ion battery packs. It integrates multiple protection functions to ensure the longevity and safety of your battery system.
Key Features:
- Over-Voltage Protection: Prevents individual cells from being charged beyond their safe voltage limit (4.25-4.35V ± 0.05V).
- Over-Discharge Protection: Stops discharge when individual cells reach a critically low voltage, preventing damage (2.3-3.0V ± 0.05V).
- Short Circuit Protection: Automatically cuts off output in case of a short circuit, with delayed self-recovery.
- Balance Function: Helps to equalize the voltage across the 3 cells in the series, promoting longer battery life and better performance.
- High Current Capability: Supports a maximum operating current of 0-25A and a maximum transient current of 34-40A.
Image 1: Front and back view of the daier 3S 11.1V 12.6V 25A Li-ion Battery PCB Protection Board. The front side shows the main components and connection points, while the back side displays the model number and dimensions.
4. Setup and Installation
Careful wiring is critical for the proper function and safety of the protection board. Refer to the wiring diagram below and follow the instructions precisely.
Wiring Instructions:
- Prepare Batteries: Ensure your 3 lithium-ion cells are matched in voltage and capacity as closely as possible.
- Connect B-: Connect the negative terminal of the first battery cell (0V) to the 'B-' pad on the protection board.
- Connect B1: Connect the positive terminal of the first battery cell and the negative terminal of the second battery cell (3.7V) to the 'B1' pad.
- Connect B2: Connect the positive terminal of the second battery cell and the negative terminal of the third battery cell (7.4V) to the 'B2' pad.
- Connect B+: Connect the positive terminal of the third battery cell (11.1V) to the 'B+' pad.
- Connect Output/Charge: The 'P+' and 'P-' pads are for both charging input and load output. Connect your charger's positive terminal to 'P+' and negative to 'P-', and similarly for your load.
- Initial Charge: After all connections are secure, connect a compatible 3S Li-ion charger to the 'P+' and 'P-' terminals. The board requires an initial charge to activate its output.
Image 2: Detailed wiring diagram for the daier 3S Li-ion Battery Protection Board. This diagram illustrates how to connect the battery cells (B-, B1, B2, B+) and the input/output terminals (P+, P-) to form a protected 3S battery pack.
Image 3: An example of the daier 3S Li-ion Battery Protection Board installed and wired to a 3-series 18650 battery pack, showing the physical connection of wires to the board and battery terminals.
5. Operation
Once properly installed and activated by an initial charge, the protection board operates automatically to manage your battery pack.
- Charging: When a charger is connected to P+ and P-, the board monitors cell voltages. If any cell exceeds the over-voltage threshold, charging for that cell (or the entire pack) will be managed to prevent damage. The balancing function will also work during charging to equalize cell voltages.
- Discharging: When a load is connected to P+ and P-, the board monitors cell voltages. If any cell drops below the over-discharge threshold, the board will cut off the output to protect the battery from deep discharge.
- Short Circuit: In the event of a short circuit at the output, the board will immediately cut off power. Output will typically resume automatically after the short circuit condition is removed (delayed self-recovery).
6. Maintenance
The daier 3S Li-ion Battery Protection Board is designed for low maintenance. However, following these guidelines can help ensure its longevity:
- Keep Clean and Dry: Protect the board from dust, dirt, and moisture. Avoid exposure to liquids.
- Inspect Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
- Avoid Physical Damage: Handle the board carefully to prevent bending, dropping, or other physical impacts that could damage components.
7. Troubleshooting
If you encounter issues with your protection board, consider the following common solutions:
- No Output After Wiring: Ensure that the battery pack has been charged at least once after initial wiring. The board requires an initial charge to activate its output.
- Battery Imbalance: If cells are not balancing correctly, verify that all individual battery cells had similar voltages before assembly. Mismatched cells can hinder effective balancing. Consider pre-balancing cells if significant voltage differences exist.
- Intermittent Output: Check all wiring connections for looseness or poor contact. Ensure solder joints are solid.
- Protection Triggered Frequently: This may indicate that the battery pack is frequently reaching its over-charge or over-discharge limits, or that the load is drawing excessive current. Review your battery capacity and load requirements.
- Short Circuit Protection: If the output cuts off due to a short circuit, remove the short and the board should self-recover. If it does not, disconnect and reconnect the battery pack (after ensuring no short circuit is present).
8. Specifications
Technical specifications for the daier 3S 11.1V 12.6V 25A Li-ion Battery PCB Protection Board:
| Parameter | Value |
|---|---|
| Over-Voltage Detection Range | 4.25 - 4.35V ± 0.05V |
| Over-Discharge Detection Range | 2.3 - 3.0V ± 0.05V |
| Maximum Operating Current | 0 - 25A |
| Maximum Transient Current | 34 - 40A |
| Quiescent Current | Less than 30µA |
| Internal Resistance | Less than 100mΩ |
| Working Temperature | -40℃ to +50℃ |
| Storage Condition | -40℃ to +80℃ |
| Effective Life | More than 30,000 hours |
| Short Circuit Protection | Yes, with delayed self-recovery |
| Dimensions (L×W×H) | 56mm × 45mm × 1.2mm |
| Material | PCB |
Image 4: The daier 3S Li-ion Battery Protection Board with its physical dimensions (56mm x 45mm x 1.2mm) clearly indicated, providing a visual reference for its size.
9. Warranty and Support
This product is manufactured by daier. For specific warranty information, please refer to the product packaging or contact your retailer. For technical support or inquiries, please reach out to the seller or manufacturer directly through their official channels.