Description
The DALY BMS Li-ion 13S 48V 80A Battery Management System is designed for 13S lithium-ion battery packs built with 18650, 21700, and other compatible Li-ion cells. It provides essential battery protection and cell-balancing functions to help improve the safety, reliability, and service life of high-power battery packs.
This DALY 13S BMS supports up to 80A continuous discharge current and a specified 240 ± 40A peak current. It includes 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 support high-current operation and improved heat dissipation. Its conformal-coated PCB also provides enhanced resistance to moisture, corrosion, and electrical interference.
Key Features
- 13S fixed configuration for Li-ion battery packs
- Designed for 48V-class lithium-ion battery systems
- 80A continuous discharge current
- 240 ± 40A peak 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
- High-resistance conformal coating
- Water-resistant and anti-corrosion PCB coating
- Suitable for high-power battery applications
Li-ion Battery Compatibility
This BMS is specifically designed for 13S lithium-ion battery packs. It is a fixed 13S configuration and should not be used for other series configurations.
Compatible battery cells can include:
- 18650 Li-ion cells
- 21700 Li-ion cells
- Compatible cylindrical Li-ion cells
- Suitable Li-ion prismatic cells
Not compatible with:
- LiFePO4 batteries
- LTO batteries
- Li-metal batteries
- Other battery chemistries requiring different protection voltages
Always confirm the battery chemistry and 13S configuration before installation.
Battery Protection Functions
Overcharge Protection
The BMS monitors individual cell voltages and disconnects charging 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 prevent individual cells from being charged beyond their recommended voltage.
Over-Discharge Protection
The BMS also monitors cell voltage during discharge and disconnects the load when a cell reaches the specified low-voltage threshold.
- Over-discharge detection: 2.2 ± 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: 80A
- Peak current: 240 ± 40A
- 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
If an external load causes a short circuit, the BMS can disconnect the battery output to help protect the battery pack and connected equipment.
- Short-circuit detection delay: 250µs
- Protection condition: External load short circuit
Temperature Protection
Temperature protection helps prevent operation outside the specified thermal limits.
According to the supplied specifications:
- Charging temperature protection: below -5°C or above 50°C
- Discharge protection: 70°C
- Working temperature: -20°C to 70°C
- Sleeping temperature: -40°C to 80°C
Cell Balancing
The BMS includes a balancing function that helps maintain more consistent voltage levels between the cells/groups in a 13S battery pack.
- Balance detection voltage: 4.18V
- Balance release voltage: 4.18V
- Balance current: 30 ± 5mA
For best results, use cells with similar capacity, internal resistance, age, and overall condition when assembling the battery pack.
High-Current Design
The DALY 13S 80A BMS uses low-resistance power MOSFETs designed for high-current switching. A built-in heat sink helps dissipate heat generated during operation.
The supplied specifications list:
- 80A continuous discharge
- 240 ± 40A peak current
- Main circuit resistance: ≤20mΩ
For applications approaching the maximum current rating, proper wiring, connectors, battery cells, ventilation, and thermal management are essential.
Conformal-Coated PCB
The PCB features a conformal coating designed to provide additional protection against environmental factors such as moisture and corrosion. This makes the board suitable for applications where the battery system may experience more demanding operating conditions.
However, the BMS should still be installed inside an appropriately protected enclosure, especially in outdoor or wet environments.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | DALY |
| Battery Chemistry | Li-ion |
| BMS Configuration | 13S |
| Nominal Battery Class | 48V |
| Continuous Discharge Current | 80A |
| Peak Current | 240 ± 40A |
| Main Circuit Resistance | ≤20mΩ |
| Charge Voltage | S × 4.25V |
| Charge Current | 40A |
| 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 | 2.2 ±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. 1 lb |
| Dimensions | Approx. 6 × 2.5 × 0.8 inches |
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