Description
The 24V 6S 40A Li-Ion BMS Protection Board is designed to manage and protect 6-series (6S) lithium-ion battery packs made from 18650 cells. It provides essential battery protection functions including overcharge, over-discharge, overcurrent, and short-circuit protection, helping protect the connected battery pack during normal charging and discharging.
This 6S BMS is suitable for a nominal 24V-class lithium-ion battery pack, with a full charging voltage of 25.5V. The board also includes a cell balancing function to help maintain more consistent voltage levels between the individual series cells during charging.
With a rated maximum continuous discharge current of 40A and an instantaneous discharge capability of up to 70A, this BMS can be used in a range of higher-current DIY battery applications, provided the battery cells, wiring, connectors, and other components are appropriately rated.
Key Features
- Designed for 6S Li-Ion battery packs
- Suitable for 18650 lithium-ion cells
- 24V-class battery system
- Maximum continuous discharge current: 40A
- Instantaneous discharge current: 70A
- Maximum charging current: 40A
- Charging voltage: 25.5V
- Built-in cell balancing function
- Balance current: 41 ± 5mA
- Overcharge protection
- Over-discharge protection
- Overcurrent protection
- Short-circuit protection
- Low working current
- Compact PCB design
- Suitable for DIY lithium battery packs
Protection Functions
Overcharge Protection
The BMS monitors the voltage of the individual lithium-ion cells. When a cell reaches the specified overcharge detection threshold of approximately 4.25V, the protection circuit can disconnect charging to help prevent continued overcharging.
- Overcharge detection: 4.25 ± 0.025V
- Overcharge delay: 1.0 ± 0.5 seconds
- Overcharge release: 4.15 ± 0.05V
Over-Discharge Protection
The board also monitors cell voltage during discharge. If a cell falls below the specified over-discharge threshold, the BMS can disconnect the load to help protect the battery from excessive discharge.
- Over-discharge detection: 2.7 ± 0.1V
- Detection delay: 1.0 ± 0.5 seconds
- Release voltage: 3.0 ± 0.1V
Overcurrent Protection
The BMS provides protection against excessive current draw. The specified overcurrent detection threshold is approximately 75 ± 5A, with a detection delay of approximately 1 ± 0.3 seconds.
After an overcurrent event, the load should be disconnected to allow the protection circuit to recover.
Short-Circuit Protection
The board includes short-circuit protection that responds rapidly when an external load creates a short circuit.
- Short-circuit detection delay: 250µs
- Recovery condition: Disconnect the load
Battery Cell Balancing
The integrated balancing function helps equalize the voltage of the six series-connected cells during charging. Cell balancing is important for multi-cell lithium battery packs because individual cells can gradually develop different voltage levels.
- Balance detection voltage: 4.125 ± 0.025V
- Balance release voltage: 4.125 ± 0.05V
- Balance current: 41 ± 5mA
6S Battery Pack Configuration
This BMS is intended for a 6S lithium-ion battery configuration, meaning six groups of lithium-ion cells are connected in series.
For standard 3.7V nominal Li-Ion cells:
6 × 3.7V = approximately 22.2V nominal
When fully charged:
6 × 4.2V = 25.2V
The listed BMS charging voltage is 25.5V, so use a compatible charging setup and follow the battery manufacturer’s recommended charging specifications.
Specifications
| Specification | Details |
|---|---|
| Product Type | Li-Ion BMS Protection Board |
| Battery Chemistry | Li-Ion |
| Battery Configuration | 6S |
| Suitable Cells | 18650 Li-Ion |
| Nominal Pack Class | 24V |
| Charging Voltage | 25.5V |
| Maximum Discharge Current | 40A |
| Instantaneous Discharge Current | 70A |
| Maximum Charging Current | 40A |
| Overcharge Detection | 4.25 ± 0.025V |
| Overcharge Release | 4.15 ± 0.05V |
| Over-discharge Detection | 2.7 ± 0.1V |
| Over-discharge Release | 3.0 ± 0.1V |
| Balance Detection Voltage | 4.125 ± 0.025V |
| Balance Current | 41 ± 5mA |
| Overcurrent Detection | 75 ± 5A |
| Short-Circuit Delay | 250µs |
| Main Circuit Resistance | ≤20mΩ |
| Working Current | ≤40µA |
| Operating Temperature | -30°C to +80°C |
| PCB Size | 88 × 34 × 2.8mm |
| Material | PCB |
| SKU | 1722 |
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