Description
The DALY BMS Li-ion 13S 48V 50A Battery Management System is designed for 13S lithium-ion battery packs built with 18650, 21700, and other compatible Li-ion cells. It provides essential protection and cell-balancing functions to help improve battery safety, reliability, and service life.
This DALY 13S BMS supports 50A continuous discharge current and a specified 150 ± 25A peak current. It provides protection against overcharge, over-discharge, over-current, short circuit, and excessive temperature during charging and discharging.
The BMS uses low-resistance power MOSFETs and a heat sink to help manage heat during high-current operation. Its conformal-coated PCB provides additional resistance against moisture, corrosion, and electrical interference, making it suitable for a variety of demanding battery-pack applications.
Key Features
- 13S fixed configuration for Li-ion battery packs
- Designed for 48V-class lithium-ion battery systems
- 50A continuous discharge current
- 150 ± 25A peak current
- 25A charging current
- Supports 18650 and 21700 Li-ion cells
- Cell-by-cell voltage monitoring
- Built-in cell balancing
- Overcharge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Charging and discharging temperature protection
- Low power consumption
- Low-resistance power MOSFETs
- Heat sink for improved cooling
- Anti-corrosion conformal PCB coating
- Enhanced moisture resistance
- Suitable for high-power Li-ion battery applications
Li-ion Battery Compatibility
This BMS is specifically designed for a 13S lithium-ion battery configuration and should not be used with other series configurations.
It can be used with compatible Li-ion cells such as:
- 18650 lithium-ion cells
- 21700 lithium-ion cells
- Compatible cylindrical Li-ion cells
- Compatible Li-ion prismatic cells
Not Suitable For
- LiFePO4 batteries
- LTO batteries
- Li-metal batteries
- Other lithium battery chemistries requiring different voltage thresholds
Always verify the battery chemistry and 13S configuration before installation.
Battery Protection Functions
Overcharge Protection
The BMS continuously monitors individual cell voltages and disconnects the charging circuit when the cell voltage reaches the specified overcharge threshold.
- Overcharge detection: 4.25 ± 0.05V
- Protection delay: 1 second
- Release voltage: 4.15 ± 0.05V
This helps protect individual cells from excessive charging voltage.
Over-Discharge Protection
The BMS monitors cell voltage during discharge and disconnects the load when a cell reaches the specified low-voltage threshold.
- Over-discharge detection: 2.7 ± 0.1V
- Detection delay: 1 second
- Release voltage: 3.0 ± 1.0V according to the supplied specification
Over-Current Protection
The BMS provides protection against excessive current during battery operation.
- Continuous discharge current: 50A
- Peak current: 150 ± 25A
- Over-current detection delay: 1ms
The actual safe operating current depends on the battery cells, wiring, busbars, connectors, cooling, and overall battery-pack construction.
Short-Circuit Protection
The BMS includes short-circuit protection to help disconnect the battery when an external load causes a short circuit.
- Short-circuit detection delay: 250µs
- Protection condition: External load short circuit
Temperature Protection
Temperature monitoring helps protect the battery pack during charging and discharging.
According to the supplied specifications:
- Charging temperature protection: below -5°C or above 50°C
- Discharge temperature protection: 70°C
- Working temperature: -20°C to 70°C
- Sleeping temperature: -40°C to 80°C
Cell Balancing
The BMS features cell balancing to help maintain more consistent voltage levels between cells/groups in the 13S battery pack.
- Balance detection voltage: 4.18V
- Balance release voltage: 4.18V
- Balance current: 30 ± 5mA
For better battery performance and balancing, use cells with similar capacity, internal resistance, age, and overall condition.
High-Current Design
The DALY 13S 50A BMS uses low-resistance power MOSFETs for high-current switching and includes a heat sink to assist with heat dissipation.
The supplied specifications list:
- 50A continuous discharge
- 150 ± 25A peak current
- 25A charge current
- Main circuit resistance: ≤20mΩ
For applications operating near the maximum current rating, appropriate battery cells, wiring, connectors, busbars, fusing, and thermal management are essential.
Conformal-Coated PCB
The PCB uses a conformal coating designed to provide additional protection against moisture, corrosion, and electrical interference.
For outdoor or humid applications, the complete battery assembly should still be installed inside a suitable protective enclosure. The supplied listing does not provide a specific IP waterproof rating.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DALY |
| Battery Chemistry | Li-ion |
| BMS Configuration | 13S |
| Nominal Battery Class | 48V |
| Continuous Discharge Current | 50A |
| Peak Current | 150 ± 25A |
| Main Circuit Resistance | ≤20mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 25A |
| 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 Protection Delay | 1 second |
| Over-Discharge Release Voltage | 3.0 ±1.0V |
| Over-Current Detection Delay | 1ms |
| Short-Circuit Detection Delay | 250µs |
| Charging Temperature Protection | < -5°C or >50°C |
| Discharge Temperature Protection | <70°C |
| Working Current | 100mA |
| Sleeping Current | 20µA |
| Working Temperature | -20°C to 70°C |
| Sleeping Temperature | -40°C to 80°C |
| Weight | Approx. 5.5 oz |
| Dimensions | Approx. 2.5 × 3.1 × 0.6 inches |
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