1. Introduction
This manual provides essential instructions for the safe and effective use of your DALY Smart BMS (Battery Management System) for Li-ion 12V 100A 4S battery packs. The BMS is designed to optimize lithium battery performance and extend battery lifespan through comprehensive charge and discharge protection management.
2. Product Overview
The DALY Smart BMS offers robust protection features including overcurrent, overcharge, overdischarge, short circuit, and temperature protection. It features a double protection design with injection patent technology and a patent shell, ensuring waterproof, dustproof, shockproof, and anti-static properties. High-quality components ensure high acquisition accuracy and durability.
This Smart BMS includes a Bluetooth module for monitoring battery status and modifying parameters via a mobile application or PC software.
Figure 1: DALY Smart BMS 4S 12V 100A unit, showing the red heat sink fins, DALY BMS logo, and terminals for P- and B- connections. The NTC, Power board, and UART ports are visible on the side.
3. Packing List
Please verify that all items are present in the package:
- 3.7V Li-ion BMS (1 unit)
- Bluetooth Module (1 unit)
- NTC Sensor (1 unit)
- Sampling Cable (1 unit)
- UART Cable (1 unit)
- Instruction Manual (1 unit)
Figure 2: Package contents, showing the DALY Smart BMS, Bluetooth module, various cables (sampling, UART), NTC sensor, and the instruction manual.
4. Setup and Installation
Proper wiring is critical for the safe and correct operation of the BMS. Please follow these steps carefully.
4.1. Protective Board Connection Battery Wiring Sequence
- Special Attention: Wiring colors from different manufacturers may vary. Always use the provided matching cables. Pay close attention to the colors of B- and P- lines.
- Important: When welding the sampling wire cable, do not insert the cable into the BMS until all other connections are complete.
- Connect the total negative electrode B- from the fine black line. The second wire (red wire) connects to the positive pole of the first string of batteries. Continue connecting the positive electrode of each string of batteries in turn until the last wire connects to the total positive B+.
- After the cable is connected, do not insert the plug directly into the BMS. First, measure the voltage between each two adjacent metal terminals on the back of the plug. For a ternary lithium battery, the voltage should be between 3.0-4.15V. For an iron-lithium battery, it should be between 2.5-3.6V. For a lithium titanate battery, it should be between 1.8-2.8V. Ensure the voltage is correct before proceeding.
- Connect the BMS B-line (blue thick line) to the total battery negative electrode (B-line length should not exceed 40cm).
4.2. After Wiring is Completed
- Measure the voltage of battery B+, B-. This should be equal to the voltage of B+ and P- (meaning the voltage of the battery pack itself). If the BMS is working normally after passing through the protection board, this voltage should be observed. If not, re-check the wiring sequence.
- The positive electrodes of the charging and discharging end are all directly connected to the total positive pole B+ of the battery. The wiring method of the same port BMS is that the charging and discharging negative poles are connected to the P- point of the BMS. The wiring method of the branch BMS is that the negative pole of charging is connected to C-, and the negative electrode of discharge is connected to P-.
Figure 3: Wiring diagram for a 4S Li-ion battery pack using the DALY Smart BMS with a common port for charge and discharge. Shows connections for B-, B+, and individual cell sampling wires.
5. Operating Instructions
5.1. Bluetooth Connectivity
The DALY Smart BMS features a Bluetooth module for wireless monitoring and parameter adjustment. To connect:
- Ensure the Bluetooth module is connected to the BMS.
- Download the DALY BMS application on your smartphone or the PC software.
- Open the application and search for available Bluetooth devices.
- Select your DALY Smart BMS from the list to establish a connection.
5.2. Monitoring and Parameter Adjustment
Once connected, you can:
- View real-time battery status, including voltage, current, temperature, and cell balance.
- Modify various protection parameters such as overcharge voltage, overdischarge voltage, and overcurrent limits.
- Access historical data and diagnostic information.
Figure 4: Illustration of the DALY Smart BMS connected to a smartphone via Bluetooth, displaying the battery monitoring interface within the application.
6. Specifications
| Feature | Value |
|---|---|
| Product Type | Li-ion 4S 100A Common Port with Balance |
| Communication Interface | UART, Bluetooth |
| Discharge Current | 100A |
| Over-discharge Current | 150A |
| Charge Current | 50A |
| Overcharge Current | 150A |
| Overcharge Voltage | 4.25V ± 0.05V (per string) |
| Over-discharge Voltage | 2.7V ± 0.05V (per string) |
| Charge Voltage | S * 4.2V (S = number of series cells) |
| Dimensions (L x W x H) | 65 x 166 x 24 mm (approx. 6.54 x 2.56 x 0.94 inches) |
| Output Wire Gauge | 7AWG / 100mm |
| Balance Wires Length | 24AWG / 300mm |
| Item Weight | 1.28 pounds |
Figure 5: Detailed specifications of the DALY Smart BMS, including current ratings, voltage thresholds, and physical dimensions.
7. Maintenance
To ensure the longevity and optimal performance of your DALY Smart BMS:
- Keep the BMS clean and free from dust and debris.
- Avoid exposing the BMS to extreme temperatures or humidity beyond its operating range.
- Regularly check all wiring connections for tightness and corrosion.
- Monitor battery parameters via the Bluetooth app to identify any anomalies early.
8. Troubleshooting
If you encounter issues with your DALY Smart BMS, consider the following:
- BMS Not Powering On: Check all main power connections (B- and P-) and ensure the battery pack voltage is within the specified range. Verify the sampling cable is correctly inserted and individual cell voltages are balanced.
- No Bluetooth Connection: Ensure the Bluetooth module is securely connected to the BMS. Restart the mobile application or PC software. Check if other Bluetooth devices are interfering.
- Overcharge/Overdischarge Protection Triggered: This indicates the BMS is functioning as designed. Review your charging/discharging habits and battery health. Ensure your charger's voltage is appropriate for a 4S Li-ion pack.
- Unusual Readings in App: Double-check all cell voltage sampling wire connections. Loose or incorrect connections can lead to inaccurate readings.
For persistent issues, refer to the "Warranty and Support" section for assistance.
9. Warranty and Support
DALY provides comprehensive customer support for its products.
- Technical Support: Lifetime technical support is available for all DALY BMS products.
- Customer Service: 24-hour one-on-one customer service is offered to address any queries or issues.
- Contact: If you require assistance, need a customized BMS, or have bulk order inquiries, please contact DALY customer service.
