Description
The DALY BMS Li-ion 20S 72V 60A Battery Management System is a high-current protection and balancing board designed for 20S Li-ion battery packs. It monitors individual cell voltages and helps protect the battery pack during charging and discharging.
The BMS provides multiple protection functions, including over-charge, over-discharge, over-current, short-circuit, and temperature protection. It is designed with high-quality MOSFETs and IC components for reliable battery management and long-term battery pack operation.
20S 72V Li-ion BMS
This BMS uses a fixed 20S configuration, meaning it is designed specifically for 20-series Li-ion battery packs. It should not be used with other series configurations.
The supplied product information specifies that this is a Li-ion-only BMS and is not intended for LiFePO4, Li-Metal, or LTO batteries.
Over-Charge & Over-Discharge Protection
The BMS monitors cell voltage during charging and discharging. According to the supplied product description, 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 provides temperature protection during battery operation. The supplied description specifies discharge protection up to 70°C and low-temperature protection down to -20°C.
Short-Circuit Protection
In the event of a short circuit or detected circuit fault, the BMS can shut down the battery output to help protect the battery pack and connected electronics.
Cell Balancing
The BMS includes a cell-balancing function with a specified 30 ± 5 mA balance current. Individual cell voltage detection helps maintain balanced operation across the 20-series battery pack.
Key Features
- DALY 20S Li-ion BMS
- Designed for 72V Li-ion battery packs
- 60A continuous discharge current
- 180A ± 30A peak current according to supplied specifications
- Cell voltage monitoring
- Cell balancing function
- Over-charge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Charging and discharging temperature protection
- High-quality MOSFET and IC design
- Heat sink for improved cooling
- Low power consumption
- Anti-corrosion and water-resistant conformal coating
- ESD protection
- 17-wire balance/sense cable included
Battery Compatibility
The supplied product information states that this BMS 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 intended strictly for Li-ion battery packs and should not be used with LiFePO4, Li-Metal, or LTO battery chemistry.
Protection Functions
| Protection | Supplied 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/at specified 70°C limit |
Technical Specifications
| Specification | Details |
|---|---|
| Battery Type | Li-ion |
| BMS Configuration | 20S |
| Battery Voltage | 72V |
| Continuous Discharge Current | 60A |
| Peak Current | 180A ± 30A |
| Main Circuit Inner Resistance | ≤20 mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 30A |
| 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 |
The technical values above are based directly on the specification table supplied in the product file.
Applications
The DALY 20S 72V 60A Li-ion BMS is listed for applications including:
- 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 72V Li-ion battery packs
Certifications
The supplied product information lists the following certifications/approvals:
- ISO
- FCC
- RoHS
- PSE
- CE
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