Description
The 24V 6S 40A 18650 Li-Ion BMS Protection Board is designed to manage and protect 6-series lithium-ion battery packs. It monitors the battery during charging and discharging and provides several protection functions to help maintain safe and reliable battery operation.
The board supports a maximum discharge current of 40A and an instantaneous discharge current of up to 70A according to the supplied specifications. It also provides cell balancing with a specified balancing current of 41 ±5mA.
This BMS can be used for 18650 Li-ion battery packs in applications such as e-bikes, scooters, solar lighting, portable power projects and other 6S lithium-ion battery systems.
6S 24V Li-ion Battery Configuration
This BMS is designed for a 6S lithium-ion battery pack, meaning six Li-ion battery groups are connected in series.
A 6S Li-ion pack is commonly referred to as a 24V battery system, while its nominal voltage is typically around 22.2V.
The board is intended for lithium-ion battery packs and should be matched correctly with the battery chemistry and series configuration before installation.
Battery Protection Functions
Overcharge Protection
The BMS continuously monitors the voltage of the individual battery groups.
The specified overcharge detection voltage is:
4.25 ±0.025V per cell
The overcharge delay is:
1.0 ±0.5 seconds
The specified overcharge release voltage is:
4.15 ±0.05V
This protection helps prevent excessive charging voltage from damaging the battery cells.
Over-Discharge Protection
The BMS also monitors battery voltage during discharge.
The specified over-discharge detection voltage is:
2.7 ±0.1V per cell
The over-discharge detection delay is:
1.0 ±0.5 seconds
The release voltage is:
3.0 ±0.1V
This helps protect the battery pack from excessive discharge.
Over-Current Protection
The BMS supports a maximum discharge current of 40A, with an instantaneous discharge current rating of 70A according to the supplied specifications.
The listed over-current detection voltage is 100mV, with an over-current detection delay of approximately 1 ±0.3 seconds.
The specified over-current threshold is:
75 ±5A
The protection is released when the load is disconnected.
Short-Circuit Protection
The board provides short-circuit protection when an external load causes a short-circuit condition.
The specified short-circuit detection delay is:
250µS
The short-circuit protection is released after the load is disconnected.
Cell Balancing
The BMS includes a battery balancing function designed to help maintain more consistent voltage levels across the six series-connected battery groups.
Specifications include:
- Balance detection voltage: 4.125 ±0.025V
- Balance release voltage: 4.125 ±0.05V
- Balance current: 41 ±5mA
Cell balancing can help improve consistency between battery groups during charging.
Charging Specifications
The supplied specifications list:
- Charging voltage: 25.5V
- Maximum charging current: 40A
Use an appropriate charger designed for the specific 6S Li-ion battery pack and charging voltage.
Low Power Consumption
The BMS has a specified working current of:
≤40µA
The low working current helps minimize power consumption from the battery while the protection board is operating.
Protection Mode and Recovery
If the maximum permissible supply voltage is exceeded, the BMS can enter a protection mode.
According to the supplied product information, the module can be restored by either:
- Re-applying the appropriate voltage to the BMS input, or
- Waiting for the protection mode to automatically disable after the required period.
Always remove the abnormal condition before attempting to restore the BMS.
Applications
The 24V 6S 40A Li-ion BMS can be used for various battery-powered applications, including:
- 18650 Li-ion battery packs
- E-bike battery packs
- Electric scooters
- Solar lighting systems
- Portable power projects
- DIY lithium-ion battery packs
- Battery-powered equipment
- 24V-class Li-ion applications
Key Features
- Designed for 6S Li-ion battery packs
- 24V-class lithium-ion battery system
- Maximum discharge current: 40A
- Instantaneous discharge current: 70A
- Maximum charging current: 40A
- Cell balancing function
- 41 ±5mA balancing current
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Low working current
- Compact PCB design
- Suitable for 18650 Li-ion battery packs
- Designed for e-bike, scooter and solar lighting applications
Technical Specifications
| Specification | Details |
|---|---|
| BMS Type | Li-ion Battery Protection Board |
| Battery Configuration | 6S |
| Battery Type | 18650 Li-Ion / Lithium-ion |
| System Voltage | 24V-class |
| Maximum Discharge Current | 40A |
| Instantaneous Discharge Current | 70A |
| Charging Voltage | 25.5V |
| Maximum Charging Current | 40A |
| Overcharge Detection Voltage | 4.25 ±0.025V |
| Overcharge Delay | 1.0 ±0.5S |
| Overcharge Release Voltage | 4.15 ±0.05V |
| Balance Detection Voltage | 4.125 ±0.025V |
| Balance Release Voltage | 4.125 ±0.05V |
| Balance Current | 41 ±5mA |
| Over-Discharge Detection Voltage | 2.7 ±0.1V |
| Over-Discharge Delay | 1.0 ±0.5S |
| Over-Discharge Release Voltage | 3.0 ±0.1V |
| Over-Current Detection Voltage | 100mV |
| Over-Current Detection Delay | 1 ±0.3S |
| Over-Current Threshold | 75 ±5A |
| Over-Current Release | Disconnect load |
| Short-Circuit Condition | External load short circuit |
| Short-Circuit Detection Delay | 250µS |
| Short-Circuit Release | Disconnect load |
| Main Circuit Resistance | ≤20mΩ |
| Working Current | ≤40µA |
| Temperature Range | -30°C to +80°C |
| Board Size | 88 × 34 × 2.8mm |
| Material | PCB |
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