DALY BMS Li-ion 13S 48V 100A BMS Battery Management System for 18650 Battery Pack Balanced Charging Board

Description

The DALY BMS Li-ion 13S 48V 100A Battery Management System is designed for 13S lithium-ion battery packs made from 3.6V/3.7V cells such as 18650 and 21700 cells. It provides essential battery protection functions including overcharge, over-discharge, over-current, short-circuit, temperature protection, and cell balancing.

With a 100A continuous discharge rating and up to 300A ±50A peak current according to the supplied specifications, this BMS is suitable for high-power lithium-ion battery packs used in electric vehicles, solar storage systems, power tools, RV applications, and other demanding battery projects.

The BMS uses protection MOSFETs and control circuitry to help improve battery safety, stability, and service life.

Key Features

• 13S Li-ion configuration for 48V-class lithium-ion battery packs
• 100A continuous discharge current
• 300A ±50A peak current as specified
• Supports Li-ion cylindrical and prismatic cells
• Suitable for 18650 and 21700 lithium-ion cells
• Built-in cell balancing
• Balance current: 30 ± 5mA
• Overcharge protection
• Over-discharge protection
• Over-current protection
• Short-circuit protection
• Temperature protection
• Low standby/sleep current
• Compact DALY BMS design
• Suitable for high-power battery pack applications

Battery Compatibility

This BMS is specifically designed for Li-ion battery chemistry and a fixed 13S configuration.

It can be used with suitable lithium-ion cells such as:

• 18650 Li-ion cells
• 21700 Li-ion cells
• Other compatible cylindrical Li-ion cells
• Compatible Li-ion prismatic cells

Important: This BMS is not suitable for LiFePO4, Li-metal, or LTO batteries. Do not use it with a different battery chemistry or an incorrect series configuration.

Protection Functions

Overcharge Protection

The BMS monitors the voltage of individual cells and disconnects charging when the overcharge detection voltage reaches approximately 4.25 ± 0.05V per cell.

• Overcharge detection: 4.25 ± 0.05V
• Overcharge protection delay: 1 second
• Overcharge release: 4.15 ± 0.05V

Over-Discharge Protection

The BMS protects the battery from excessive discharge by disconnecting the load when the cell voltage becomes too low.

• Over-discharge detection: 2.7 ± 0.1V
• Detection delay: 1 second
• Release voltage: approximately 3.0V according to the supplied specification

Over-Current Protection

The BMS monitors excessive current and provides protection against over-current conditions.

• Continuous discharge: 100A
• Peak current: 300A ±50A
• Over-current detection delay: 1ms

Actual usable current depends on battery-cell capability, wiring, connectors, cooling, installation, and the battery pack’s overall design.

Short-Circuit Protection

The BMS includes short-circuit protection to help protect the battery pack and connected equipment from sudden external short circuits.

• Short-circuit detection delay: 250µs
• Protection condition: external load short circuit

Temperature Protection

Temperature monitoring helps protect the battery pack during charging and discharge.

According to the supplied specifications:

• Charging temperature protection: below -5°C or above 50°C
• Discharge temperature protection: up to approximately 70°C
• Working temperature range: -20°C to 70°C
• Sleeping/storage temperature range: -40°C to 80°C

Cell Balancing

The BMS includes passive cell balancing to help maintain more consistent voltage levels between cells/groups in the battery pack.

• Balance detection voltage: 4.18V
• Balance release voltage: 4.18V
• Balance current: 30 ± 5mA

Properly matched cells with similar capacity, internal resistance, age, and condition are recommended when assembling a 13S battery pack.

Technical Specifications