1. Introduction
This manual provides essential information for the safe and effective use of the DALY 3S 12V 15A Li-ion Battery Management System (BMS). This device is designed to protect lithium battery packs, ensuring their longevity and safe operation.
Key features of this DALY BMS include:
- Injection molding sealing process for dustproof, shockproof, waterproof, and anti-accumulation functions.
- Multi-function protection: Over-charging, Over-discharging, Over-current, Temperature, and Short-circuit protection.
- Compact size and low temperature rise.
- Easy installation with plug-and-play balance wires.
Figure 1: DALY 3S 12V 15A Li-ion BMS with included balance wires.
2. Safety Information
Please read and understand all safety instructions before installing or operating the DALY BMS. Failure to follow these instructions may result in electric shock, fire, serious injury, or property damage.
- Qualified Personnel: Installation and wiring should only be performed by qualified personnel with experience in battery systems.
- Voltage Check: Always verify the voltage of the battery pack and individual cells before connecting the BMS. Ensure compatibility with the BMS specifications.
- Polarity: Observe correct polarity when connecting the BMS to the battery pack. Incorrect connections can damage the BMS and battery.
- Short Circuits: Avoid short circuits during installation. Use insulated tools and protective gear.
- Temperature: Operate the BMS within its specified temperature range. Excessive heat can damage the unit.
- Water and Moisture: Although the BMS has some water resistance, avoid exposing it to excessive moisture or submersion.
- Damage: Do not use the BMS if it appears damaged.
Figure 2: Overview of DALY BMS protection features.
3. Applications
The DALY BMS is versatile and suitable for various lithium battery applications, including large single cell battery packs, cylindrical cell battery packs, and soft cell battery packs. It can be integrated into a wide range of devices.
Figure 3: Common applications for DALY BMS.
4. Setup and Installation
Proper wiring is critical for the correct function of the BMS. Follow these steps carefully. The wiring diagram below illustrates the general connection process.
Figure 4: DALY BMS wiring diagram (example based on G series 20A BMS).
Installation Steps:
- Solder the sampling cables: The first cable (black) in the sampling cable set connects to the overall negative terminal of the battery pack (B-). Subsequent cables (red) connect to the positive terminal of each battery string in sequence (e.g., first red cable to the positive terminal of the first string, second red cable to the positive terminal of the second string, and so on, until all cells are connected).
- Check the cables: After connecting the sampling cables, measure the voltage between two adjacent cables starting from the header. Ensure there are no wrong connections or missing connections. The voltage readings should be consistent with the nominal voltage of a single cell.
- Connect the output wires: Connect the B- wire of the BMS to the total negative terminal of the battery pack. Then, plug the sampling cable to the BMS. After activating the BMS, measure the voltage between B+ (overall positive of battery pack) and B- (BMS negative output) and the voltage between P+ (load/charger positive) and P- (BMS negative output) to ensure they are consistent.
Note: The specific wiring for your battery pack (e.g., 3S Li-ion) must match the BMS configuration. Always double-check all connections before applying power.
5. Operation
The DALY BMS operates automatically once correctly installed and connected to the battery pack. Its primary function is to monitor and protect the battery cells.
- Charging: The BMS will manage the charging process, preventing over-charging by disconnecting the charger if any cell voltage exceeds the over-charge protection threshold.
- Discharging: During discharge, the BMS monitors cell voltages and current. It will cut off discharge if any cell voltage drops below the over-discharge protection threshold or if the current exceeds the over-current limit.
- Balancing: The integrated balance function helps to equalize the voltage across individual cells in the battery pack, improving overall pack health and lifespan.
- Temperature Protection: The temperature sensor monitors the battery pack's temperature and will initiate protection if temperatures exceed safe operating limits.
No user intervention is typically required for the basic operation of this standard BMS model. For advanced features or communication functions, a smart BMS model would be required.
6. Maintenance
The DALY BMS is designed for low maintenance. However, periodic checks can help ensure optimal performance and longevity.
- Visual Inspection: Periodically inspect the BMS and its connections for any signs of damage, corrosion, or loose wiring.
- Cleanliness: Keep the BMS free from dust and debris. Use a soft, dry cloth for cleaning.
- Environmental Conditions: Ensure the BMS is operating within its specified temperature and humidity ranges. Avoid extreme conditions.
- Battery Health: Monitor the overall health of your battery pack. A healthy battery pack contributes to the optimal performance of the BMS.
7. Troubleshooting
If you encounter issues with your DALY BMS, consider the following common troubleshooting steps:
- No Output Voltage:
- Check all wiring connections for looseness or incorrect polarity.
- Verify the battery pack voltage is within the BMS's operating range.
- Ensure no protection functions (over-discharge, short-circuit) have been triggered. Disconnect and reconnect the load/charger to reset if necessary.
- Battery Not Charging:
- Check charger functionality and connections.
- Verify individual cell voltages. If any cell is overcharged, the BMS will prevent further charging.
- Ensure the temperature sensor is correctly installed and not indicating an over-temperature condition.
- Battery Not Discharging (Load Cut Off):
- Check for short circuits in the load.
- Verify individual cell voltages. If any cell is under-voltage, the BMS will cut off discharge.
- Ensure the load current does not exceed the BMS's continuous discharge current rating.
- Unbalanced Cells:
- Allow the battery pack to sit for some time after charging to allow the balance function to work.
- Ensure all balance wires are correctly connected and making good contact.
If problems persist after following these steps, please contact DALY customer service for further assistance.
8. Specifications
The following table details the specifications for the DALY 3S 12V 15A Li-ion BMS.
Figure 5: DALY 3S 15A Li-ion BMS Specifications.
| Feature | Value |
|---|---|
| Product Type | Li-ion 3S 15A common port with balance |
| Discharge Current | 15A |
| Overdischarge Current | 35±10A |
| Charging Current | 15A |
| Overcharge Current | 15±2A |
| Overcharge Voltage | 4.25V±0.05V |
| Overdischarge Voltage | 2.7V±0.05V |
| Charge Voltage | 12.6V |
| Model | J13G (3-13S) |
| Dimensions (L x W x H) | 59*34*9 mm (2.32*1.33*0.35 inches) |
| Output Wire | 16AWG/110mm |
| Balance Cable | 24AWG/300mm |
| Weight | 60±35g |
Additional product dimensions: 2.32 x 1.34 x 0.35 inches. Item Weight: 4.6 ounces.
9. Packing List
Upon opening the package, please verify that all items listed below are present and undamaged.
Figure 6: Contents of the DALY BMS package.
| Item | Quantity |
|---|---|
| BMS Unit | 1 |
| Instruction Manual | 1 |
| Balance Cable Set | 1 |
10. Warranty and Support
DALY is committed to providing high-quality products and customer satisfaction.
- Technical Support: We offer 24-hour one-on-one customer service and lifetime technical support for our products.
- Contact: For any inquiries, technical assistance, or warranty claims, please contact DALY customer service through the retailer or official channels.
- Note: Standard BMS models do not include communication functions. If you require a smart BMS, active balancer, parallel module, or other accessories, please contact customer service for options.
