1. Introduction
The Daly M Series Smart Battery Management System (BMS) is designed for mid-to-large current applications, offering advanced protection and monitoring for Li-ion and LiFePo4 battery packs. This series supports a wide range of cell configurations from 3S to 24S and current ratings of 150A or 200A. Key features include a waterproof design, smart connectivity, parallel connection capability, and robust protection mechanisms to ensure the safety and longevity of your battery system.
Figure 1: Daly M Series Smart BMS overview, highlighting key features and supported battery types.
2. Features
- Waterproof Design: Enhanced durability and protection against environmental elements.
- Smart Connectivity: Bluetooth for mobile APP, UART, RS485, and CAN communication for PC host monitoring and control.
- Parallel Connection Support: Allows for increased capacity and power output by connecting multiple BMS units.
- High Current Handling: Available in 150A and 200A versions to suit various power demands.
- High Precision: Equipped with a high-end MCU chip for voltage accuracy of 10-15mV, short circuit protection response within 10-500µs, and SOC error less than 5%.
- Low Power Consumption: Features a sleeping current of less than 600uA and a working current of less than 20mA.
- Multi-Duct Cooling Structure: Advanced thermal design with aluminum heat dissipation components for effective heat management.
- Comprehensive Protection: Includes protection against overcharge, over-discharge, over-current, short circuit, temperature fluctuations, static electricity, and physical shock.
- Passive Balance: Integrated 100mA passive balancing function to maintain cell voltage consistency.
- Pre-charged Power Supply: Incorporates a pre-charge function for safer initial power-up.
- NTC Continuous Monitoring: Provides continuous temperature monitoring for enhanced safety.
- Portable Size: Compact design for easy installation and space-saving.
Figure 2: Key features of the Daly M Series Smart BMS.
Figure 3: Visual representation of the six main advantages of the Daly M Series BMS.
3. Specifications
| Attribute | Value |
|---|---|
| Accessory Type | Battery Accessories |
| Origin | Mainland China |
| Certification | CE, FCC, RoHS |
| Apply to Battery Type | LiFePo4/Li-ion |
| Charging/Discharging Port | Common Port |
| Battery Strings | 3S, 4S, 7S, 8S, 10S, 12S, 13S, 14S, 15S, 16S, 17S, 20S, 24S |
| Balance Current | 0.1A |
| Charge/Discharge Current (M Series) | 150A, 200A |
| Communication | RS485/Uart/CAN |
| Extra Function | APP/BT (Bluetooth) |
| Dimensions (approx.) | 66mm x 164mm x 21mm (2.6 x 6.5 x 0.8 inches) |
| NTC Length | 250mm |
| Pre-charge Function | Yes |
| Parallel Current Limiting | No |
| Expandable Accessories/Functions | Bluetooth, expandable 4-way NTC, WiFi module, 3-inch display, 4.3-inch display, single-line display, key light board, key switch, heating module, buzzer, external parallel module, active balance module |
Detailed Electrical Specifications
Figure 4: Detailed electrical specifications from Daly laboratory tests.
| Parameter | Li-ion (3.7V) | LiFePo4 (3.2V) |
|---|---|---|
| Charge Voltage (V) | S(Strings)*4.2V (Li-ion) / S(Strings)*3.65V (LiFePo4) | |
| Discharge Current (A) | 150 / 200 | 150 / 200 |
| Over-Discharge Protection Current (A) | 225 / 300 | 225 / 300 |
| Charge Voltage (V) | 150 / 200 | 150 / 200 |
| Over-Charge Protection Current (A) | 225 / 300 | 225 / 300 |
| Internal Resistance (mΩ) | <10 | |
| Balanced Current | (100±15mA) | |
| Activation Voltage | 3.9V | 3.4V |
| Activation Voltage Difference | 50mV | |
| Balance Current (Li-ion) | 100+/- 15mA | 100+/- 30mA |
| Short Circuit Protection | External Circuit Short Circuit, Detecting Delay: 10-500µS, Release Conditions: Load Removed | |
| Cell Over-Charge Protection Voltage | 4.25V | 3.75V |
| Cell Over-Charge Protection Delay (S) | 1+/- 0.8 | |
| Cell Over-Charge Recovery Voltage | 4.15V | 3.65V |
| Cell Over-Discharge Protection Voltage | 2.7V | 2.2V |
| Cell Over-Discharge Protection Delay (S) | 1+/- 0.8 | |
| Cell Over-Discharge Recovery Voltage | 2.8V | 2.3V |
| Working Temperature (°C) | -35 to 75 | |
| Storage Temperature (°C) | -40 to 85 | |
| Self-Consumption (Working) | < 20mA | |
| Self-Consumption (Sleeping) | < 600uA (sleeping time: 3600) | |
4. Setup
Wiring Steps
- First, connect the B- line of the BMS to the total negative pole of the battery pack.
- The wiring starts from the thin black wire connected to B-. The second wire is connected to the positive electrode of the first string of batteries, and the positive electrode of each subsequent string of batteries is connected in turn. Then, insert the cable into the BMS. The B+ connection should be made to the last string of positives.
- After the wiring is completed, observe whether the green indicator light is working. Connect the Bluetooth APP or PC software to check for any fault messages. Measure the voltages of battery B+ and B- to ensure they are the same as those of P+ and P-. The BMS should be working normally if these voltages match; otherwise, please re-operate according to the above steps.
Figure 5: Wiring diagram for the Daly M Series Smart BMS.
When Removing The BMS
First, disconnect the load power switch and unplug the ribbon cable (if there are two cables, first pull out the high-voltage cable, then pull out the low-voltage cable). Then, remove P-, and finally remove power line B-.
Note: The ZD- on the copper plate is connected to the brake resistor, which connects to the positive terminal of the battery (optional function, used for power applications that require braking and energy absorption scenarios. If not needed, it can be left disconnected).
5. Operating
Indicator LED Status
The BMS features an indicator LED to show its operational status:
- Light off: BMS is in sleeping mode or not powered.
- Light flash (2.5s on, 0.5s off, 3s per cycle): Discharging.
- Light flash (0.5s on, 0.5s off, 1s per cycle): Charging.
- Light flash (0.5s on, 9.5s off, 10s per cycle): Working but no charging/discharging.
Smart Monitoring (APP/PC)
The Daly M Series Smart BMS can be monitored and controlled via a mobile application (iOS/Android) or PC host software, utilizing Bluetooth, UART, RS485, or CAN communication protocols. This allows for real-time data access and configuration.
Figure 6: Mobile APP interface for monitoring battery parameters.
Through the APP or PC software, you can view critical battery parameters such as:
- State of Charge (SOC)
- Individual Cell Voltages
- Total Voltage
- Current (Charge/Discharge)
- Temperature (via NTC sensors)
- Warning and Fault Messages
- Battery Cycle Times
The PC host communication also allows for reviewing and changing multiple protection values, including overcharge, over-discharge, over-current, and temperature protection. You can also set up functions for optional accessories like a key button, heating module, and buzzer. Software upgrades are possible, and the system supports real-time data storage locally and online management via WiFi/4G modules.
Figure 7: PC Host Communication interface for advanced monitoring and configuration.
Figure 8: Communication pathways for the Daly Smart BMS, including Bluetooth, WiFi, and 4G.
6. Maintenance
- Keep Dry: Ensure the BMS is installed in a dry environment to prevent water damage, despite its waterproof design.
- Avoid Extreme Temperatures: Operate and store the BMS within the specified temperature ranges (-35 to 75°C operating, -40 to 85°C storage) to ensure optimal performance and longevity.
- Regular Connection Checks: Periodically inspect all wiring connections to ensure they are secure and free from corrosion. Loose connections can lead to poor performance or damage.
- Monitor via APP/PC: Regularly use the mobile APP or PC software to monitor battery health, cell balance, and any warning messages. This proactive monitoring can help identify and address potential issues early.
- Cleanliness: Keep the BMS free from dust and debris, especially around the cooling fins, to maintain effective heat dissipation.
7. Troubleshooting
- BMS Not Powering On / No Indicator Light:
- Recheck all wiring connections, especially the B- and B+ lines to the battery pack. Ensure the main power switch is on. - Fault Messages on APP/PC:
- If the APP or PC software displays fault codes or warnings, refer to the specific fault description within the software. Common issues include over-voltage, under-voltage, over-current, or temperature warnings. Verify individual cell voltages and temperatures. - Incorrect Voltage Readings:
- Ensure the sampling cable is correctly connected to each cell. Measure the voltages of battery B+ and B- with a multimeter and compare them to the P+ and P- voltages to confirm consistency. - Battery Imbalance:
- If cell voltages are significantly different, the passive balancing function should work to equalize them over time. If imbalance persists, check for faulty cells or issues with the balance wiring. - Communication Issues (Bluetooth/UART/RS485/CAN):
- Ensure the communication module (e.g., Bluetooth module) is correctly connected to the BMS. Verify that the correct communication protocol and baud rate are selected in your software. Check for driver issues on the PC. - Overheating:
- Ensure the BMS has adequate ventilation and that its cooling fins are not obstructed. Reduce the load if continuous high current causes excessive heat.
8. User Tips
- Utilize Smart Monitoring: Take full advantage of the Bluetooth APP and PC software to regularly monitor your battery pack's health. This allows for proactive maintenance and can significantly extend battery life.
- Proper Cell Balancing: While the BMS provides passive balancing, ensuring your battery cells are well-matched and balanced before initial assembly can lead to better overall performance and longevity.
- Consider Optional Accessories: Depending on your application, accessories like the heating module (for cold environments), buzzer (for audible alerts), or external displays can enhance the functionality and user experience of your battery system.
- Secure Connections: Always double-check all wiring connections, especially high-current paths and balance leads, to prevent resistance, heat buildup, and potential failures.
- Environmental Protection: Even with a waterproof design, protecting the BMS from direct exposure to harsh elements (e.g., prolonged submersion, extreme dust) will help ensure its long-term reliability.
9. Warranty & Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt or order details handy as proof of purchase.
