Description
The DALY BMS Li-ion 3S 12V 50A Battery Management System is designed to protect and manage 3-series lithium-ion battery packs. It is suitable for battery packs built using 18650, 21700, 36500 cylindrical cells as well as compatible prismatic lithium-ion cells.
This 3S 12V BMS provides essential battery protection functions including overcharge protection, over-discharge protection, over-current protection, short-circuit protection and temperature protection. It also supports cell balancing to help maintain more consistent voltage levels across the cells in a battery pack.
With a maximum continuous discharge current of 50A, the DALY BMS is suitable for a variety of higher-current lithium-ion battery applications such as electric bikes, skateboards, power tools, solar systems and other battery-powered equipment.
Fixed 3S Li-ion Configuration
This is a fixed 3S BMS, designed specifically for a 3-series lithium-ion battery pack.
A 3S Li-ion pack normally uses three groups of lithium-ion cells connected in series, with a nominal voltage of approximately 11.1V and a maximum charging voltage of 12.6V.
Important: This BMS is strictly designed for Li-ion batteries. It should not be used with LiFePO4, lithium-metal or LTO battery packs.
Battery Protection Functions
Overcharge Protection
The BMS monitors the voltage of each cell and provides overcharge protection when the cell voltage reaches approximately 4.25V ±0.05V.
The maximum charging voltage specified for the complete 3S pack is 12.6V.
Over-Discharge Protection
The BMS helps protect lithium-ion cells from excessive discharge. The specified discharge protection threshold is 2.7V ±0.1V per cell.
This helps prevent battery cells from being discharged below the recommended voltage range.
Over-Current Protection
The BMS is rated for a maximum continuous discharge current of 50A and uses low-resistance power MOSFETs to handle higher current loads.
Short-Circuit Protection
If a short-circuit or abnormal load condition occurs, the BMS is designed to shut down the battery output to help protect the battery pack and circuit board.
Temperature Protection
The BMS includes temperature protection for battery operation. The supplied product information specifies protection during high-temperature discharge and low-temperature operation.
The stated temperature protection range includes:
- Low-temperature protection: down to approximately -20°C
- High-temperature discharge protection: approximately 70°C
Cell Balancing
The DALY 3S 12V 50A BMS includes a balancing function with a specified balancing current of approximately 30mA ±5mA.
Cell balancing helps maintain a more consistent voltage level between the three series-connected battery groups, supporting more stable battery pack operation.
High-Current Performance
With a 50A maximum continuous discharge rating, this BMS is designed for applications that require relatively high output current.
The board uses high-voltage-resistant, low-internal-resistance MOSFETs, while the heat sink helps with heat dissipation during operation.
Low Power Consumption
The BMS is designed with low power consumption, with a specified idle current consumption of approximately 100µA.
This helps minimize unnecessary battery drain when the battery management system is operating without a significant load.
Compatible Battery Cells
This BMS is designed for lithium-ion battery cells, including:
- 18650 Li-ion cells
- 21700 Li-ion cells
- 36500 cylindrical Li-ion cells
- Compatible prismatic Li-ion cells
Not Compatible With
Do not use this BMS with:
- LiFePO4 batteries
- Lithium-metal batteries
- LTO batteries
Always make sure the battery chemistry and series configuration match the BMS before connecting the battery pack.
Applications
The DALY 3S 12V 50A Li-ion BMS can be used in a variety of battery pack projects and portable power applications, including:
- Solar battery systems
- RV battery packs
- Electric bikes
- Electric skateboards
- Camping boats
- Power tools
- Lawn equipment
- Household energy storage
- DIY lithium-ion battery packs
- Other 3S Li-ion battery projects
Key Features
- Designed for 3S lithium-ion battery packs
- 12V nominal battery pack configuration
- 50A maximum continuous discharge current
- 12.6V maximum charging voltage
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Temperature protection
- Cell balancing function
- Approximately 30mA ±5mA balancing current
- Low idle current consumption
- Supports 18650, 21700 and 36500 Li-ion cells
- Compatible with suitable prismatic Li-ion cells
- High-current MOSFET design
- Heat sink for improved heat dissipation
- Conformal coating for improved resistance to corrosion, moisture and ESD according to the supplied product information
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DALY |
| BMS Type | Li-ion Battery Management System |
| Battery Configuration | 3S |
| Nominal Voltage | 11.1V |
| Maximum Charging Voltage | 12.6V |
| Maximum Charging Current | 25A |
| Maximum Continuous Discharge Current | 50A |
| Battery Chemistry | Lithium-ion (Li-ion) |
| Overcharge Protection | 4.25V ±0.05V |
| Over-Discharge Protection | 2.7V ±0.1V |
| Balancing Current | 30mA ±5mA |
| Idle Current Consumption | 100µA |
| Output Wires | 2 × 6mm² (AWG10) |
| Dimensions | 80 × 61 × 12 mm |
| Weight | 126 g |
| Balance/Sense Cable | 4-wire cable with connector |
Reviews
There are no reviews yet.