1. Introduction
The DALY Smart Active Balance BMS is designed to optimize the performance and lifespan of your battery pack. Battery cells often have slight variations in capacity, internal resistance, and voltage. Without proper management, these differences can lead to premature overcharging or over-discharging of individual cells, accelerating degradation and reducing the overall battery pack's capacity and cycle life.
This BMS features a third-generation active balancing function, capable of up to 1A balancing current. It intelligently redistributes energy from higher-energy cells to lower-energy cells, or uses the entire pack's energy to supplement the lowest cell. This process ensures maximum battery consistency, extends battery mileage, and prolongs battery life, going beyond simple data collection to provide true battery management.
2. Product Overview and Key Features
- Third-Generation Active Balancing: Integrates advanced active balancing for superior cell consistency.
- Wide Compatibility: Smart integrated design compatible with 8-24 series battery strings (NCM, LFP, LTO).
- Integrated Bluetooth: Allows quick and easy viewing and setting of BMS parameters via a dedicated mobile application.
- Robust Design: Utilizes TOLL package MOS tubes with low resistance, low parasitic inductance, and low thermal resistance, suitable for high-power and high-current applications.
- Extensive Peripheral Support: Compatible with a variety of external accessories to meet diverse application scenarios.
- Remote Monitoring: Supports IoT cloud platforms for remote battery management and terminal monitoring.
- PC Host Communication: Enables viewing historical data and batch parameter settings via a PC host interface.
- Advanced Protection: Features overcharge, over-discharge, overcurrent, and short circuit protection functions.
- Configurable Parameters: Communication function allows setting parameters such as over-current, over-discharge, over-charge, equalization, over-temperature, under-temperature, hibernation, and capacity via PC or APP.
- Efficient Heat Dissipation: Multi-channel cooling structure with a high-speed fan and aluminum alloy heat sink ensures excellent thermal performance.
3. Specifications
3.1 Basic Specifications
| Index | Specification | Remarks |
|---|---|---|
| Battery pack type | NCM, LFP, LTO | |
| Number of battery strings | NCM: 8-17S/8-20S; LFP: 8-17S/8-24S; LTO: 8-17S/8-24S | |
| Cell sampling voltage range | 1.5V-4.9V | |
| Operating voltage range | >10V | |
| Balance method | Active Balance | |
| Working power consumption | <1.25W | Idle State |
| Sleep current | 8-17S 35mW; 8-24S 45mW | Idle State |
| Working Light | Green: normal; Red: alarm/protection | |
| Product weight | 222±5g | |
| Product size (L*W*H) | 167.5*65.5*14.5mm | |
| Precharge size | 4700-33000uF | with 25R resistor |
3.2 Technical Parameters
| Test Content | Default Parameters | Unit | Remarks |
|---|---|---|---|
| Rated Discharge Current | 40/60/80/100 | A | |
| Rated Charge Current | 40/60/80/100 | A | |
| Balanced Start Voltage | 3.0 | V | Can Be Set |
| Balanced Opening Voltage Difference | ≥10 | mV | Can Be Set |
| Balance Current | 900±200 | mA | Can Be Set |
Note: Balancing activates when both conditions are met: 1) Reach the set opening voltage; 2) Reach the set opening voltage difference. If one condition is not met, balance will be closed.
4. Setup and Installation
4.1 Package Contents
Before installation, please verify that all items are present in the package:
- Smart active balance BMS unit
- P-&B-cable (Power and Battery cables)
- Screws for mounting
- Sampling cable (Balance wires)
- B+ cable
- Key switch cable
- NTC (Temperature sensor)
- User Manual (PDF available online)
- Packaging box
4.2 Wiring Instructions
Important Precautions:
- Always discharge static electricity before handling the BMS.
- Use only the matching cables provided by DALY. Cables from other manufacturers may not be compatible.
- Ensure the heat dissipation surface of the BMS does not directly contact the battery cells to prevent heat transfer and ensure battery safety.
- Avoid contact between the heat sink and battery core/nickel strip during assembly.
- When plugging or unplugging connector cables, always press the buckle to avoid damaging the wires.
- The product defaults to the maximum number of strings. It will automatically recognize the actual number of strings upon first power-up. If recognition fails, you can set it via the APP or PC host software.
Sampling Cable Welding:
- Start with the thin black wire, connecting it to the battery's total negative terminal (B-).
- Connect the second wire (B1+) to the positive terminal of the first battery string.
- Continue connecting each subsequent wire sequentially to the positive terminal of each battery string.
- Finally, connect the B+ cable to the positive terminal of the last battery string (total positive pole).
Wiring Diagrams:
4.3 APP and Manual Downloads
Scan the QR codes below or visit the official website to download the user manual and mobile application:
Official Website: https://www.dalyelec.com/service.html
Scan for Manual
Scan for APP
A PDF version of the user manual is also available: User Manual (PDF)
5. Operation
5.1 Communication Interfaces
The DALY BMS supports multiple communication protocols for monitoring and control:
- UART Communication: The default protocol for direct communication with Bluetooth modules, display screens, and PC host computers. Custom communication protocols can also be implemented.
- RS485 Communication (Optional): Used with a dedicated communication box to connect to a PC host. Default baud rate is 9600bps. Allows viewing battery information (voltage, current, temperature, SOC, status) and setting parameters. Supports program upgrades.
- CAN Communication (Optional): DALY's default CAN protocol operates at 250KB/S.
5.2 Mobile APP Control
The self-developed "Balance BMS" APP (available on iOS and Android) provides a personal lithium battery steward, allowing you to monitor battery data and set parameters at any time. It supports multiple languages and auto-switches with your phone's system language.
5.3 PC Host Software (DALY BMS Tool)
The DALY BMS Tool software for PC allows for comprehensive data monitoring, parameter configuration, and production management. After logging in and connecting, you can view real-time data (voltage, temperature, configuration values), read/write parameters, and perform BMS upgrades.
5.4 Buzzer and Keyswitch Logic
- Buzzer Logic: Can be configured via the APP. Default logic triggers an alarm (1 second on, 1 second off) when charging/discharging temperature reaches 60°C, until temperature drops below 60°C. Custom logic can be requested.
- Keyswitch Logic: Controls MOS and sleep functions. Default is disabled. Two optional logics are available: control discharge MOS, or control discharge MOS with hibernation. The control logic is positive (control occurs when the switch is closed). Custom logic can be requested.
6. Maintenance
- Battery Type Setting: For battery packs with different voltage platforms, ensure the battery type is correctly set in the BMS. The factory default is typically for lithium iron phosphate (LiFePO4) parameters.
- Cable Integrity: Regularly inspect all cables for signs of wear, damage, or loose connections. Ensure all connections are secure.
- Thermal Management: The BMS is designed with multi-channel cooling and an aluminum alloy heat sink. Ensure adequate airflow around the BMS and avoid obstructing the fan (if present). Do not allow the heat dissipation surface of the BMS to directly contact battery cells.
- Cleanliness: Keep the BMS free from dust and debris to ensure optimal cooling and prevent short circuits.
- Firmware Updates: Periodically check for firmware updates via the PC host software or APP to ensure optimal performance and access to new features.
7. Troubleshooting
The DALY BMS incorporates various protection mechanisms. If an issue occurs, the BMS will trigger an alarm or protection state. If the BMS behaves abnormally, stop using it immediately and identify the cause before resuming operation.
7.1 Protection Functions
- Overcharge Protection: Prevents cells from being charged beyond their safe voltage limit.
- Over-discharge Protection: Prevents cells from being discharged below their safe voltage limit.
- Overcurrent Protection: Protects against excessive charge or discharge currents. Recovery typically involves removing the charger or load.
- Short Circuit Protection: Detects and protects against short circuits. Recovery involves removing the load or charging source.
- Temperature Protection: Monitors and protects against high and low temperatures during charging and discharging.
- MOS Temperature Protection: Monitors the temperature of the MOS transistors and triggers protection if they overheat.
- Voltage Difference Alarm: Alerts if there is an excessive voltage difference between cells.
- Temperature Difference Alarm: Alerts if there is an excessive temperature difference between cells.
- Thermal Runaway Protection: Detects conditions indicative of thermal runaway (rapid voltage drop, sudden temperature rise) and takes action to shut down the MOS and activate the buzzer. Recovery requires rebooting the BMS.
7.2 General Troubleshooting Tips
- No Power/No Indication: Check all power connections, especially B- and B+ cables. Ensure the battery pack voltage is within the BMS operating range.
- Balancing Not Active: Verify that the balanced start voltage and balanced opening voltage difference parameters are met. These can be checked and adjusted via the APP or PC software.
- Communication Issues: Ensure the correct communication protocol (UART, RS485, CAN) is selected and the baud rate is properly configured. Check cable connections for damage.
- Inaccurate Readings: If voltage or current readings appear incorrect, ensure all sampling wires are correctly connected and not damaged.
- BMS Abnormal Behavior: If the BMS exhibits unexpected behavior, stop use. Do not attempt to disassemble or modify BMS components. Contact support for assistance.
8. User Tips
- Initial Setup: Always perform a thorough check of all wiring connections before applying power to the BMS for the first time. Double-check the polarity of all connections.
- Parameter Customization: Take advantage of the APP and PC host software to customize protection parameters (e.g., voltage limits, current limits, temperature thresholds) to match your specific battery chemistry and application requirements.
- Regular Monitoring: Periodically check battery cell voltages and temperatures via the APP to ensure optimal performance and detect any potential issues early.
- Environmental Considerations: While the BMS is designed for robust performance, operating it within a friendly environment (avoiding extreme temperatures, direct sunlight, or excessive humidity) can prolong its lifespan.
- Redundancy: For critical applications, consider incorporating a certain level of redundancy in your BMS setup as a precautionary measure.
9. Frequently Asked Questions (FAQ)
- Q: What battery types are compatible with this BMS?
- A: This BMS is compatible with NCM (Li-ion), LFP (LiFePO4), and LTO battery types.
- Q: How do I connect the temperature sensors (NTC)?
- A: The NTC cables connect to the designated NTC-A and NTC-B interfaces on the BMS. Ensure proper connection as per the interface definition in the manual.
- Q: Can I use this BMS for a 12V or 48V battery pack?
- A: Yes, the BMS supports various string configurations (e.g., 4S12V, 8S24V, 16S48V) within its 8S-17S range. Refer to the specifications for exact string compatibility.
- Q: What should I do if the BMS is not communicating with the APP or PC software?
- A: First, ensure the correct communication module (Bluetooth, WiFi, RS485, CAN) is connected and powered. Check the communication settings (e.g., baud rate for RS485) and ensure the APP/software is up to date. Verify physical cable connections.
- Q: What is the warranty period for this product?
- A: The product is guaranteed for free within one year from the date of purchase under normal use. Damage caused by human factors will incur paid maintenance.
- Q: Where can I find detailed product data and statistical information?
- A: The data description and statistical data of all products in our store are derived from the company's internal test measurement results or reports and are for reference only. The actual situation shall prevail.
10. Warranty and Support
10.1 Warranty Information
DALY provides a one-year warranty for all lithium battery BMS products from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Damage resulting from human factors or improper use is not covered under the free warranty and will be subject to paid maintenance.
10.2 Technical Support
For technical assistance, troubleshooting, or inquiries regarding your DALY BMS, please contact our support team. Our technical sales experts are available to help resolve any problems within 24 hours via phone and email. Whether it's pre-sales or after-sales support, our team is dedicated to providing professional and cordial services.
Contact Information:
- Address: 21/F, building 7, Tian'an Yungu, No. 14, Gongye South Road, Songshanhu District, Dongguan, China
- Phone: 0769-82822953
You can also visit our official website for more resources and support: https://www.dalyelec.com/service.html
