Description
The DALY BMS Li-ion 20S 72V 40A Battery Management System is a protection and balancing board designed for 20-series Li-ion battery packs. It monitors individual cell voltages and helps protect the battery during charging and discharging.
This BMS provides multiple protection functions, including over-charge, over-discharge, over-current, short-circuit, and temperature protection. It uses high-quality MOSFETs and integrated circuits and is designed to support reliable operation and longer battery pack service life.
20S 72V Li-ion BMS
The BMS uses a fixed 20S configuration, so it is specifically designed for 20-series Li-ion battery packs. It cannot be used for other series configurations.
This model is intended strictly for Li-ion batteries and should not be used with LiFePO4, Li-Metal, or LTO batteries.
Over-Charge & Over-Discharge Protection
The BMS monitors cell voltage during charging and discharging. The supplied product information states that charging stops when a cell reaches 4.25V, while discharge protection operates when the cell voltage reaches the specified low-voltage protection level.
Temperature Protection
The BMS includes temperature protection during battery operation. The supplied specifications indicate charging protection below -5°C or above 50°C, while discharge protection is specified below the 70°C limit. The stated working temperature range is -20°C to 70°C.
Short-Circuit Protection
The BMS provides short-circuit protection and can shut down the battery output when a short-circuit condition is detected. This helps protect the battery pack and connected electronics.
Cell Balancing
The BMS features a cell-balancing function with a specified 30 ± 5 mA balance current. Individual cell voltage detection helps monitor the cells and provides over-charge and over-discharge protection.
Key Features
- DALY 20S Li-ion BMS
- Designed for 72V Li-ion battery packs
- 40A continuous discharge current
- 120A ± 20A peak current
- Cell voltage monitoring
- Cell balancing function
- Over-charge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Charging and discharging temperature protection
- Mechanical temperature sensor
- High-quality protective IC
- High-voltage, low-resistance power MOSFETs
- Heat sink for improved cooling
- Low power consumption
- Anti-corrosion and water-resistant conformal coating
- ESD protection
- 17-wire balance/sense cable included
The supplied product description specifically highlights the mechanical temperature sensor, 40A constant discharge capability, cell-level voltage detection, low power consumption, and conformal coating.
Battery Compatibility
This BMS is designed for compatible 20S Li-ion battery packs and can be used with various Li-ion cell formats, including:
- 18650 cylindrical cells
- 21700 cylindrical cells
- 36500 cylindrical cells
- Compatible prismatic Li-ion cells
It is strictly intended for Li-ion chemistry and should not be used with LiFePO4, Li-Metal, or LTO batteries.
Protection Functions
| Protection | Specification |
|---|---|
| Over-Charge Detection | 4.25 ± 0.05V |
| Over-Charge Protection Delay | 1 sec |
| Over-Charge Release | 4.15 ± 0.05V |
| Over-Discharge Detection | 2.7 ± 0.1V |
| Over-Discharge Protection Delay | 1 sec |
| Over-Discharge Release | 3.0 ± 1.0V |
| Over-Current Detection Delay | 1 ms |
| Short-Circuit Detection Delay | 250 μs |
| Balance Detection Voltage | 4.18V |
| Balance Release Voltage | 4.18V |
| Balance Current | 30 ± 5 mA |
| Charge Temperature Protection | Below -5°C or above 50°C |
| Discharge Temperature Protection | Below 70°C |
Technical Specifications
| Specification | Details |
|---|---|
| Battery Type | Li-ion |
| BMS Configuration | 20S |
| Battery Voltage | 72V |
| Continuous Discharge Current | 40A |
| Peak Current | 120A ± 20A |
| Main Circuit Inner Resistance | ≤20 mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 20A |
| Over-Charge Detect Voltage | 4.25 ± 0.05V |
| Over-Charge Protection Delay | 1 sec |
| Over-Charge Release Voltage | 4.15 ± 0.05V |
| Balance Detect Voltage | 4.18V |
| Balance Release Voltage | 4.18V |
| Balance Current | 30 ± 5 mA |
| Over-Discharge Detect Voltage | 2.7 ± 0.1V |
| Over-Discharge Protection Delay | 1 sec |
| Over-Discharge Release Voltage | 3.0 ± 1.0V |
| Over-Current Detect Delay | 1 ms |
| Over-Current Detect Voltage | Off Load |
| Short-Circuit Protection Condition | Short Circuit External Load |
| Short-Circuit Detect Delay | 250 μs |
| Short-Circuit Protection Relay Condition | Off Load |
| Working Current | 100 μA |
| Sleeping Current | 20 μA |
| Working Temperature | -20°C to 70°C |
| Sleeping Temperature | -40°C to 80°C |
| Weight | 8 ounces |
| Size | 2.6 × 5 × 0.6 inches |
These specifications are based on the supplied product specification table.
Applications
The DALY 20S 72V 40A Li-ion BMS is suitable for compatible battery-pack applications such as:
- 72V electric bikes
- Electric scooters
- Electric skateboards
- Solar energy systems
- RV battery systems
- Camping and portable power systems
- Boats
- Power tools
- Lawn equipment
- Household energy storage
- Custom 20S Li-ion battery packs
The supplied product information lists solar, RV, electric bikes, skateboards, camping boats, power tools, lawn equipment, and household energy storage as applications.
Certifications
The supplied product information lists:
- ISO
- FCC
- RoHS
- PSE
- CE
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