Description
The DALY BMS Li-ion 7S 24V 50A is designed to protect and manage 7S lithium-ion battery packs built with compatible 3.7V Li-ion cells. It is suitable for battery packs using 18650, 21700, 36500 cylindrical cells and compatible prismatic cells.
This BMS provides important battery protection functions, including over-charge, over-discharge, over-current, short-circuit, and temperature protection. It also features a built-in cell balancing function to help maintain better voltage balance between the cells in a 7S battery pack.
With a high-current design and balance connection, this DALY BMS is suitable for electric bikes, electric skateboards, solar systems, RVs, power tools, portable power applications, and custom 24V Li-ion battery packs.
Key Features
- Designed for 7S 24V Li-ion battery packs
- Rated for high-current battery applications
- Supports 18650, 21700 and 36500 Li-ion cells
- Compatible with suitable Li-ion prismatic cells
- Over-charge protection
- Over-discharge protection
- Over-current protection
- Short-circuit protection
- Temperature protection
- Built-in cell balancing function
- Includes 8-wire balance/sense cable
- Includes instruction manual
- Waterproof BMS design as specified by the supplied product information
7S Li-ion Battery Pack Protection
The DALY 7S BMS monitors the individual cells in a lithium-ion battery pack and provides several protection functions to help keep the pack operating within the specified electrical limits.
Over-Charge Protection
During charging, the BMS monitors cell voltage and provides over-charge protection when the cell voltage reaches the specified protection level of 4.25 ±0.05V. The specified over-charge release voltage is 4.15 ±0.05V.
Over-Discharge Protection
The BMS protects the battery pack from excessive discharge. The specified over-discharge detection voltage is 2.7 ±0.1V, while the release voltage is approximately 3.0 ±1.0V.
Over-Current Protection
The BMS includes over-current protection with a specified detection delay of 1ms. This helps protect the battery pack when the current exceeds the BMS’s specified operating limits.
Short-Circuit Protection
If a short circuit occurs on the external load, the BMS can disconnect the battery output. The supplied specifications list a 250µs short-circuit detection delay.
Temperature Protection
Temperature protection is included for both charging and discharging. The supplied specifications indicate charging temperature protection below -5°C or above 50°C, with discharge protection above 70°C.
Cell Balancing
The built-in balancing circuit helps maintain a more consistent voltage level between the cells in the 7S battery pack.
The supplied balance specifications are:
- Balance detection voltage: 4.18V
- Balance release voltage: 4.18V
- Balance current: 30 ±5mA
Compatible Battery Cells
This is a 7S Li-ion BMS and is specifically intended for lithium-ion battery packs. It can be used with compatible:
- 18650 Li-ion cells
- 21700 Li-ion cells
- 36500 cylindrical Li-ion cells
- Suitable Li-ion prismatic cells
Important: This BMS is designed for Li-ion battery chemistry only. It should not be used with LiFePO4, LTO, or other incompatible battery chemistries.
Applications
The DALY 7S 24V BMS can be used in a range of compatible battery projects, including:
- Electric bike battery packs
- Electric skateboards
- Solar energy storage systems
- RV and camping power systems
- Power tools
- Portable power banks
- Household energy storage
- Custom 24V Li-ion battery packs
- DIY lithium-ion battery projects
Technical Specifications
| Specification | Details |
|---|---|
| Battery Type | Li-ion |
| Configuration | 7S |
| Nominal Pack Voltage | 24V |
| Continuous Discharge Current | 40A* |
| Peak Current | 120A ±20A |
| Main Circuit Internal Resistance | ≤20mΩ |
| Charge Voltage | 7S × 4.25V |
| Charge Current | 20A |
| Over-Charge Detection Voltage | 4.25 ±0.05V |
| Over-Charge Protection Delay | 1 second |
| Over-Charge 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 |
| Working Current | 100µA |
| Sleeping Current | 20µA |
| Working Temperature | -20°C to 70°C |
| Sleeping Temperature | -40°C to 80°C |
| Weight | 5.5 ounces |
| Size | 2.5 × 3.1 × 0.6 inches |
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