Description
The DALY BMS Li-ion 3S 12V 100A Battery Management System is a dedicated protection and balancing board designed for 3S lithium-ion battery packs with a nominal voltage of 12V.
It continuously monitors the battery cells during charging and discharging and provides several protection functions to help maintain safe battery operation. These include overcharge protection, over-discharge protection, over-current protection, short-circuit protection, and temperature protection.
With a 100A continuous discharge current and a peak current rating of 300A ±50A, this BMS is designed for high-current Li-ion battery applications such as electric vehicles, e-bikes, power tools, solar systems and DIY battery packs.
3S Fixed Li-ion Configuration
This is a 3S fixed-configuration BMS, meaning it is specifically designed for a battery pack containing 3 Li-ion cells or cell groups connected in series.
It is strictly intended for Li-ion battery chemistry and should not be used with:
- LiFePO4 batteries
- Li-Metal batteries
- LTO batteries
- Other battery chemistries requiring different protection parameters
Always confirm the battery chemistry and 3S configuration before connecting the BMS.
Overcharge and Over-discharge Protection
The BMS monitors the voltage of each cell and provides protection against excessive charging and discharging.
The supplied specifications include:
- Overcharge detection voltage: 4.25 ± 0.05V per cell
- Overcharge release voltage: 4.15 ± 0.05V
- Overcharge protection delay: 1 second
- Over-discharge detection voltage: 2.7 ± 0.1V
- Over-discharge release voltage: 3.0 ± 1.0V
- Over-discharge protection delay: 1 second
These functions help prevent the individual cells from operating outside their specified voltage limits.
Built-in Cell Balancing
The DALY 3S 12V 100A BMS includes a cell balancing function to help maintain more consistent voltage levels between the cells in the battery pack.
Balancing specifications:
- Balance detection voltage: 4.18V
- Balance release voltage: 4.18V
- Balance current: 30 ± 5mA
The BMS comes with a 4-wire balance/sense cable with connector for monitoring the individual series cell groups.
High-Current Performance
This model supports a 100A continuous discharge current and a specified peak current of 300A ±50A.
The board uses a high-current MOSFET-based design according to the supplied product information, with a main circuit inner resistance of ≤20mΩ.
This makes the BMS suitable for battery packs where higher discharge current is required.
Over-current and Short-circuit Protection
The BMS provides protection against excessive current and external short-circuit conditions.
- Over-current detection delay: 1ms
- Short-circuit detection delay: 250μs
- Short-circuit protection condition: Short circuit external load
When a short-circuit condition is detected, the BMS is designed to disconnect the battery output to help protect the battery pack and connected equipment.
Temperature Protection
Temperature monitoring is provided during both charging and discharging.
According to the supplied specifications:
- Charging protection: below -5°C or above 50°C
- Discharge protection: above 70°C
- Working temperature: -20°C to 70°C
- Sleeping temperature: -40°C to 80°C
Low Power Consumption
The product specifications list a working current of 100μA and a sleeping current of 20μA when in discharge, helping reduce the BMS’s own power consumption when the battery is not actively operating.
Compatible Li-ion Battery Cells
This BMS is designed for compatible lithium-ion battery cells, including:
- 18650 Li-ion cells
- 21700 Li-ion cells
- 36500 cylindrical Li-ion cells
- Compatible prismatic Li-ion cells
The battery pack must be configured as 3S and use Li-ion chemistry.
Applications
The DALY 3S 12V 100A Li-ion BMS can be used for a variety of battery applications, including:
- Electric bikes and e-bike battery packs
- Electric skateboards
- Solar battery systems
- RV power systems
- Power tools
- Camping boats
- Lawn equipment
- Household energy storage
- DIY lithium-ion battery packs
- Custom high-current battery projects
Key Features
- DALY 3S 12V 100A Li-ion BMS
- 100A continuous discharge current
- 300A ±50A peak current
- Fixed 3S configuration
- Designed specifically for Li-ion battery packs
- Built-in cell balancing
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Temperature protection
- Low power consumption
- Compatible with 18650, 21700 and 36500 Li-ion cells
- Supports compatible cylindrical and prismatic Li-ion cells
- Includes 4-wire balance/sense cable with connector
- Instruction manual included
- Product information specifies ISO, FCC, RoHS, PSE and CE approval claims
- Product information describes a conformal coating for corrosion, water-resistance and ESD protection
What You Get
- 1 × DALY 3S 12V 100A Li-ion BMS
- 1 × 4-wire balance/sense cable with connector
- 1 × Instruction manual
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DALY |
| Battery Type | Li-ion |
| Configuration | 3S |
| Nominal Voltage | 12V |
| Continuous Discharge Current | 100A |
| Peak Current | 300A ±50A |
| Main Circuit Inner Resistance | ≤20mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 50A |
| Overcharge Detection Voltage | 4.25 ± 0.05V |
| Overcharge Protection Delay | 1 second |
| Overcharge Release Voltage | 4.15 ± 0.05V |
| Balance Detection Voltage | 4.18V |
| Balance Release Voltage | 4.18V |
| Balance Current | 30 ± 5mA |
| Over-discharge Detection Voltage | 2.7 ± 0.1V |
| Over-discharge Detection Delay | 1 second |
| Over-discharge Release Voltage | 3.0 ± 1.0V |
| Over-current Detection Delay | 1ms |
| Over-current Detection Voltage | Off load |
| Short-circuit Protection Condition | Short circuit external load |
| Short-circuit Detection Delay | 250μs |
| Short-circuit Protection Relay Condition | Off load |
| Charging Temperature Protection | Below -5°C or above 50°C |
| Discharge Temperature Protection | Above 70°C |
| Working Current | 100μA |
| Sleeping Current | 20μA |
| Working Temperature | -20°C to 70°C |
| Sleeping Temperature | -40°C to 80°C |
| Weight | 1 pound |
| Size | 6.2 × 2.5 × 1 inches |
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