JK-BD4A24S-4P Active Balancing BMS | 40A Lithium Battery Management Board

JK-BD4A24S-4P Active Balancing BMS | 40A Lithium Battery Management Board

JK-BD4A24S-4P Active Balancing BMS | 40A Lithium Battery Management Board

JK-BD4A24S-4P is a high-current active balancing lithium battery protection board developed by Chengdu Jikong Technology. It supports 7~24S ternary lithium, 8~24S LiFePO4 and 14~24S lithium titanate battery packs. Built-in 0.4A large current active equalization, max 40A continuous charge/discharge current, full protection functions with Bluetooth APP control, widely used in energy storage, solar power station, RV backup power and battery pack projects.

1. Product Overview & Core Advantages

Active Balancing Technology

Adopts energy transfer active equalization with independent intellectual property rights, max 0.4A balancing current. Transfer energy from high-voltage cells to low-voltage cells to improve cell consistency, extend battery cycle life and increase full discharge range.

Full Protection System

Standard equipped with overcharge, overdischarge, overcurrent, short circuit, over-temperature & low-temperature charge protection. Automatic recovery design avoids manual reset after protection trigger.

JK BMS internal structural block diagram

2. Complete Function Feature List

  • 0.4A High Current Active Cell Balancing (Standard)
  • Bluetooth Connection & Mobile APP Remote Control (Android / iOS)
  • High Precision Voltage (±3mV) & Current Sampling, Built-in Coulomb Counter
  • Optional: Display Screen, GPS Module, RS485 / CAN Communication Port
  • Optional: Heating Function, Alarm Module, Multi Battery Parallel Function
  • Full safety protection: Charge overvoltage / Discharge undervoltage / Overcurrent / Short circuit / Overheat / Low temp charge lock
  • Emergency 30-min bypass switch for road emergency use
  • Intelligent sleep mode to reduce static power consumption
  • Real-time running log & cell data recording

3. Model Selection Guide

Model Ternary Lithium LiFePO4 Lithium Titanate Optional Upgrades
JK-BD4A24S-4P 7~24S 8~24S 14~24S CAN / RS485 / Heating / Alarm / Parallel
JK-BD4A20S-4P 7~20S 8~20S 14~20S CAN / RS485 / Heating / Alarm / Parallel
JK-BD4A17S-4P 7~17S 8~17S 14~17S CAN / RS485 / Heating / Alarm / Parallel
JK BMS model function selection comparison table

4. Main Technical Parameters

Parameter Item Specifications Unit
Supply Voltage 20 ~ 100 V
Max Balancing Current 0.4 A
Continuous Charge / Discharge Current 40 A
Max Instantaneous Current 80 A
Operating Temperature -30 ~ 70 ℃
Board Dimension 116 * 103 * 17.6 mm
Net Weight 205 g

5. Interface & Wiring Introduction

The JK-BD4A24S-4P board is equipped with multiple standard interfaces for cell sampling, communication, heating, display and parallel connection. All balance wires must be connected in sequence from B1 to B24 before powering on to avoid hardware damage.

BMS connector pin and LED indicator diagram
24S full battery wiring schematic diagram
JK-BD4A24S-4P dimension drawing

6. Mobile APP Operation Guide

  1. Scan the QR code on the BMS board to download JK BMS APP (Android 7.0 & above / iOS supported)
  2. Complete wiring inspection first, then activate the board via charger / external button / display screen
  3. Open phone Bluetooth, search and pair with JK-BD4A24S-4P device
  4. Set battery type (Ternary / LiFePO4 / LTO), cell series number, capacity and protection threshold parameters
  5. Turn on/off active balancing, heating, alarm and emergency switch on BMS control page
  6. Real-time monitor single cell voltage, total voltage, charge/discharge current, temperature and SOC value
JK BMS mobile APP operation interface screenshot

7. Application Scenarios

Solar Energy Storage System
RV / Camper Power Pack
Mobility Scooter & Sightseeing Vehicle
Base Station Backup Power
Off-Grid Energy Storage Battery Pack

8. Installation & Safety Notes

  • Check all balance wires in strict order before powering on; wrong B string wiring will burn the protection board instantly
  • P- (load/charger negative) and B- (battery total negative) must not be reversed
  • If heating function is installed, add a 45~65℃ normally closed thermal fuse for secondary safety protection
  • Do not exceed the max 40A continuous discharge current for long-term load operation
  • For long-term idle storage, enable intelligent sleep mode to reduce self-consumption
  • When parallel multiple battery packs, purchase optional parallel module and turn off charge current limit in APP

Get Your JK-BD4A24S-4P Active BMS Today

Support customized optional functions: CAN, RS485, heating, alarm, parallel module & LCD display.

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