Description
The 4S 30A LiFePO4 BMS is a battery management and protection board designed for 4-series (4S) 3.2V LiFePO4 lithium iron phosphate battery packs. It provides essential protection during charging and discharging while helping keep the cells balanced for reliable battery pack operation.
This high-current 30A LiFePO4 BMS supports up to 30A continuous discharge current and up to 20A charging current. The board includes a built-in balancing circuit and comes with a balance cable, making it suitable for DIY battery packs and various 12.8V LiFePO4 applications.
Key Features
- Designed for 4S LiFePO4 battery packs
- Suitable for 3.2V LiFePO4 cells
- 30A maximum continuous discharge current
- 56A ±10A over-current detection
- Supports up to 20A charging current
- Built-in cell balancing circuit
- Over-charge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Balance protection
- Compact PCB design
- Comes with balance cable
4S LiFePO4 Battery Configuration
This BMS is designed for a 4S LiFePO4 battery configuration, using four groups of 3.2V LiFePO4 cells connected in series.
A 4S LiFePO4 pack provides a nominal battery voltage of approximately 12.8V, making this BMS suitable for compatible 12.8V LiFePO4 battery pack projects.
Important: This board is specifically designed for LiFePO4 / lithium iron phosphate chemistry. Make sure the battery cells and charging system are compatible with the BMS before installation.
Battery Protection Functions
Over-Charge Protection
The BMS monitors the voltage of the individual cells during charging. The over-charge detection voltage is specified as 3.75 ±0.05V, with an over-charge release voltage of 3.60 ±0.05V.
Over-Discharge Protection
The board also protects the battery cells from excessive discharge. The specified over-discharge detection voltage is 2.1 ±0.08V, while the release voltage is 2.3 ±0.1V.
Over-Current Protection
The BMS provides high-current protection with a specified current detection level of 56 ±10A. The over-current detection delay is 20ms.
Short-Circuit Protection
Short-circuit protection helps disconnect the battery pack when an external load creates a short-circuit condition. The specified release condition is cut load.
Cell Balancing
The built-in balancing circuit helps maintain a more consistent voltage between the cells in the 4S battery pack.
The specified balance parameters are:
- Balance detection voltage: 3.60 ±0.05V
- Balance release voltage: 3.59 ±0.05V
- Balance current: 58mA
Charging and Discharging
The BMS supports a specified charging voltage of 14.8V and a maximum charging current of 20A.
For battery discharge, the board supports up to 30A continuous current, with an instantaneous discharge current specification of 56A.
Applications
The 4S 30A LiFePO4 BMS can be used for compatible battery pack projects such as:
- 12.8V LiFePO4 battery packs
- DIY LiFePO4 battery projects
- Portable power systems
- Solar battery projects
- Backup power applications
- Battery-powered equipment
- Custom lithium iron phosphate battery packs
Technical Specifications
| Specification | Details |
|---|---|
| Battery Chemistry | LiFePO4 |
| Configuration | 4S |
| Cell Voltage | 3.2V |
| Battery Pack Voltage | 12.8V nominal |
| Continuous Discharge Current | 30A Max |
| Instantaneous Discharge Current | 56A |
| Charging Voltage | 14.8V |
| Charging Current | 20A Max |
| Over-Charge Detection | 3.75 ±0.05V |
| Over-Charge Release | 3.60 ±0.05V |
| Over-Charge Protection Delay | 1300ms |
| Balance Detection Voltage | 3.60 ±0.05V |
| Balance Release Voltage | 3.59 ±0.05V |
| Balance Current | 58mA |
| Over-Discharge Detection | 2.1 ±0.08V |
| Over-Discharge Release | 2.3 ±0.1V |
| Over-Discharge Delay | 145S |
| Over-Current Detection Voltage | 200mV |
| Over-Current Detection Delay | 20ms |
| Current Detection | 56 ±10A |
| Internal Resistance | ≤20mΩ |
| Working Current | ≤30µA |
| Sleep Current | ≤20µA |
| Working Temperature | -30°C to +80°C |
| PCB Size | 56 × 47mm |
| Balance Cable | Included |
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