Description
The 3S 60A 12.6V Li-Ion BMS Protection Board is designed to protect and manage 3-cell series lithium-ion battery packs made from 18650, 26650, or compatible Li-Ion cells. It provides essential battery protection functions such as overcharge, over-discharge, overcurrent, short-circuit protection, and cell balancing.
This BMS is suitable for a 3S Li-Ion battery pack, which has a nominal voltage of approximately 11.1V when using standard 3.7V lithium-ion cells and reaches approximately 12.6V when fully charged.
The board features an automatic recovery function and is designed for applications where battery protection and balanced charging are required. Its compact PCB design makes it suitable for DIY battery packs, portable electronics, power tools, robotics, and other lithium-ion battery projects.
Key Features
- Designed for 3S Li-Ion battery packs
- Suitable for 18650 and compatible Li-Ion cells
- 11.1V nominal battery pack
- 12.6V full-charge voltage
- Up to 60A advertised discharge capability
- Continuous charging current up to 30A
- Overcharge protection
- Over-discharge protection
- Short-circuit protection
- Automatic recovery function
- Cell balancing function
- Compact PCB design
- Suitable for DIY battery pack construction
3S Battery Configuration
A 3S battery pack consists of three lithium-ion cell groups connected in series.
For standard 3.7V nominal Li-Ion cells:
3 × 3.7V = 11.1V nominal
At full charge:
3 × 4.2V = 12.6V
The three cell groups should be properly matched in voltage, capacity, and internal resistance before being assembled into a battery pack.
Battery Protection Functions
Overcharge Protection
The BMS monitors the voltage of the individual cells and helps prevent them from being charged beyond the specified voltage limit.
- Overvoltage range: 4.25–4.35V ± 0.05V
Over-Discharge Protection
The protection circuit monitors cell voltage during discharge and disconnects the load when the cell voltage falls into the specified protection range.
- Over-discharge range: 2.3–3.0V ± 0.05V
Short-Circuit Protection
The board includes short-circuit protection with an automatic/self-recovery function. If a short circuit is detected, the protection circuit can disconnect the output to help protect the battery and BMS.
Battery Balancing
The balanced version of this board includes a balancing function to help keep the three series-connected battery groups at more consistent voltage levels during charging.
Balancing is particularly useful in multi-cell lithium battery packs because differences in cell capacity and internal resistance can cause individual cells to reach different voltage levels.
Charging
The recommended full-charge voltage for a standard 3S Li-Ion battery pack is 12.6V.
Use a suitable 12.6V Li-Ion charger/CC-CV power supply designed for a 3S lithium-ion battery pack. The BMS provides battery protection and balancing but should not be considered a substitute for a properly regulated Li-Ion charger.
Specifications
| Specification | Details |
|---|---|
| Product Type | 3S Li-Ion BMS Protection Board |
| Battery Chemistry | Li-Ion |
| Battery Configuration | 3S |
| Compatible Cells | 18650 / 26650 / Li-Ion |
| Nominal Voltage | 11.1V |
| Full Charge Voltage | 12.6V |
| Advertised Discharge Rating | Up to 60A |
| Supplied Continuous Discharge Specification | 40A |
| Maximum Continuous Charge Current | 30A |
| Charging Voltage | 12.6V–13V |
| Overvoltage Protection | 4.25–4.35V ± 0.05V |
| Over-discharge Protection | 2.3–3.0V ± 0.05V |
| Working Current | <30µA |
| Short-Circuit Protection | Yes |
| Recovery | Automatic / Self-Recovery |
| Service Life | >50,000 hours (manufacturer specification) |
| Operating Temperature | -40°C to +50°C |
| Storage Temperature | -40°C to +80°C |
| PCB Size | Approximately 41 × 55 × 3.4mm |
| SKU | 1717 |
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