1. Introduction
This manual provides essential instructions for the safe and effective use of your DALY BMS 13S 48V 250A Li-ion Battery Protection Module. Please read this manual thoroughly before installation and operation to ensure proper functionality and safety.
Figure 1: DALY BMS 13S 48V 250A Li-ion Battery Protection Module
2. Safety Information
Adhering to safety precautions is crucial when working with battery management systems. Failure to follow these guidelines can result in injury, damage to equipment, or fire.
- Always wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves, when handling batteries and electrical components.
- Ensure all connections are correct and secure before applying power. Incorrect wiring can cause damage to the BMS, battery pack, or connected equipment, and poses a fire hazard.
- Do not short-circuit the battery terminals or the BMS output.
- Avoid exposing the BMS to moisture, extreme temperatures, or corrosive environments.
- Only use the BMS with compatible Li-ion battery packs (13S, 48V nominal).
- If you are unsure about any part of the installation or operation, consult a qualified professional.
3. Product Overview
The DALY BMS 13S 48V 250A Li-ion Battery Protection Module is designed to protect 13-series (13S) 48V Li-ion battery packs. It offers comprehensive protection features to optimize battery performance and extend its lifespan.
- Protection Features: Includes overcurrent, overcharge, overdischarge, short circuit, and temperature protection.
- Durability: Features double protection with injection patent technology and a patent shell, providing waterproof, dustproof, shockproof, and anti-static properties.
- Quality: Constructed with high-quality components for pressure resistance, durability, and high acquisition accuracy.
- Ease of Installation: Designed for easy plug-and-unplug connections between the battery pack and the BMS.
Figure 2: Top view of the DALY BMS showing main power cables and balance lead connector.
Figure 3: Side view of the DALY BMS with approximate dimensions (221mm x 130mm x 32mm).
4. Installation and Wiring
4.1 Package Contents
Verify that all items are present in the package:
- 1x 3.7V Li-ion NCM BMS
- 1x NTC sensor
- 1x Sampling cable
- 1x Instruction Manual
Figure 4: Example of DALY BMS package contents.
4.2 Wiring Diagram
Figure 5: Wiring Diagram Instruction for DALY BMS.
I. Connection sequence of protection board and battery:
Special attention: The cables provided by different manufacturers are not universally compatible. Always use the supporting cables supplied with your DALY BMS.
- Important: When soldering the sampling cable, ensure the cable is not inserted into the BMS.
- Connect the sampling line: Start with the thin black line to the total negative electrode (B-). The second line (red line) connects to the positive electrode of the first battery string. Continue connecting each subsequent line to the positive electrode of each battery string until the last line connects to the total positive electrode (B+).
- After connecting the balance cables, do not immediately insert the plug into the BMS. First, measure the voltage between each two adjacent metal terminals on the back of the plug. For Li-ion batteries, the voltage should be between 3.0V and 4.15V. For LiFePO4 batteries, it should be between 2.5V and 3.6V. For LTO batteries, it should be between 1.8V and 2.8V. Ensure the voltage is correct before proceeding.
- Connect the b-wire (thick blue wire) of the protection plate to the negative pole of the battery pack.
- Finally, insert the balance cable plug into the BMS.
II. After wiring:
- Measure whether the battery B+, b-voltage, and B+, p-voltage are equal. This confirms that the voltage of the battery pack itself is equal to the voltage after passing through the protection board. If they are equal, the BMS is functioning normally. If not, recheck the wiring sequence.
- The positive electrodes of the charge and discharge terminals are directly connected to the total positive electrode B+ of the battery.
- For common port BMS models, the negative electrodes of both charge and discharge are connected to the P- terminal of the protection board.
For an official website tutorial, please visit: https://www.dalyelec.cn/newsshow.php?cid=24&id=73
5. Operating Instructions
Once properly installed, the DALY BMS will automatically manage the charging and discharging of your Li-ion battery pack. It continuously monitors cell voltages, currents, and temperatures to ensure safe operation within specified parameters. The BMS will initiate protective actions (e.g., cutting off charge/discharge) if any parameter exceeds safe limits, indicated by a temporary interruption of power flow.
6. Maintenance
The DALY BMS is designed for minimal maintenance. Periodically inspect all wiring connections for tightness and signs of wear or corrosion. Ensure the BMS unit is kept clean and free from dust or debris. Avoid physical impact or excessive vibration. Do not attempt to open or repair the BMS unit yourself, as this will void the warranty and may cause damage.
7. Troubleshooting
If the battery pack or connected equipment is not functioning as expected, consider the following common issues and their potential solutions:
- No Power Output: Check all wiring connections, especially the B- and P- terminals. Verify that the battery pack voltage is within the normal operating range. The BMS may have activated a protection feature (e.g., over-discharge protection); try charging the battery.
- Charging Issues: Ensure the charger is compatible and functioning correctly. Check for overcharge protection activation. Verify balance lead connections are secure and in the correct sequence.
- Overheating: Ensure adequate ventilation around the BMS and battery pack. Reduce load if continuous high current is causing excessive heat.
- BMS Not Activating: Recheck the balance lead connection sequence and ensure all cell voltages are within acceptable limits before inserting the balance plug into the BMS.
For further assistance, refer to the official website or contact DALY customer support.
8. Technical Specifications
The following table outlines the key technical specifications for the DALY 13S Li-ion (Standard) BMS:
| Description | Specification | Unit | |
|---|---|---|---|
| Discharge | Continuous Discharge Current | 250A | |
| Over Discharge Current Detect | 500A | ||
| Main Circuit Conduct Inner Resistance | <20 | mΩ | |
| Charge | Charge Voltage (per cell) | 4.2V | V |
| Charge Current | 125A | ||
| Overcharge Protection | Over Charge Detect Voltage | 4.25±0.05 | V |
| Over Charge Protection Delay | 1 | S | |
| Over Charge Release Voltage | 4.15±0.05 | V | |
| Balance | Balance Detect Voltage | 4.13 | V |
| Balance Release Voltage | 4.13 | V | |
| Balance Current | 30±5 | mA | |
| Over Discharge Protection | Over Discharge Detect | 2.7±0.05 | V |
| Over Discharge Detect Delay | 1 | S | |
| Over Discharge Release Voltage | 3.0±0.05 | V | |
| Over Current Protection | Over Charge Current Detect Delay | 1 | S |
| Short Circuit Protection Condition | Off load | ||
| Short Circuit Protection | Short Circuit Detect Delay | 200-500 | uS |
| Short Circuit Protection Release | Off load | ||
| Temperature Protection | Temperature Protection Degrees | Charge: -20~55 °C, Discharge: -40~75 °C | |
| Self Consumption | Working Current | 100-200 | uA |
| Sleeping Current (over-discharge) | 0 | uA | |
| Working Temperature | Temp Range | -20~60 °C | |
| Storing Temperature | Temp Range | -40~85 °C | |
9. Applications
The DALY BMS is suitable for a wide range of applications utilizing Li-ion battery packs, including:
- Electric scooters and E-bikes
- Tourist sightseeing vehicles and electric tricycles
- Low-speed electric vehicles (EVs)
- Emergency UPS systems
- Solar street lights and photovoltaic energy storage
- RV and home energy storage systems
Figure 6: Wide range of applications for DALY BMS products.
Figure 7: DALY BMS integrated into a solar street light battery system.
10. Warranty and Support
This DALY BMS product comes with a quality guarantee, being ISO/FCC/RoHS/PSE/CE APPROVED, ensuring compliance with international standards. DALY is committed to customer satisfaction and offers 24-hour one-on-one customer service and lifetime technical support.
For any inquiries, technical assistance, or support, please contact DALY customer service through the official channels provided at the point of purchase or on the DALY official website.
