JK-BD6AxxS Series Active Balancing BMS Full Manual V19.1.1

JK-BD6AxxS Series Active Balancing BMS Full Manual V19.1.1

1. Document Revision Record

Revision Date Version Update Summary Author
2025.03.19 V19.1.1 First official release Zhang Haiyan

2. Product Overview

2.1 BMS Introduction

This intelligent lithium battery management system is specially designed for large-capacity series lithium battery packs, compatible with LiFePO4, Ternary Lithium, Lithium Titanate cells.

Core advantage: Self-developed energy transfer active balancing technology with max 0.6A continuous balancing current, greatly improves cell consistency, extends battery cycle life and driving range.

Support iOS & Android Jikong BMS Bluetooth APP for real-time monitoring, parameter modification, manual charge/discharge control. Widely used for RV, energy storage, solar power, sightseeing vehicles, backup power systems.

JK-BD6AxxS Structural Block Diagram

2.2 Full Feature List

  • LED Bluetooth connection status indicator
  • Mobile APP Bluetooth remote control
  • High precision voltage sampling (±3mV error)
  • 0.6A built-in active balance
  • Full set protection: overcharge, overdischarge, overcurrent, short circuit, high/low temperature
  • Optional functions: CAN / RS485 / Heating / Alarm / ACC / Parallel module / GPS
  • External LCD display screen support
  • Auto sleep low power design & emergency 30min power supply mode

3. Product Selection Guide

3.1 Standard Function Configuration Table

No. Function Item Configuration
1 Active balancing current 0.6A (Standard)
2 Bluetooth / UART / Display port Standard equipped
3 NTC temperature sensor 1 internal + 2 external
4 CAN / RS485 / Heating / Alarm / ACC / Parallel Optional add-on
5 Overcharge / Overdischarge / Short circuit protection Standard equipped

3.2 Model Current Classification Rules

Suffix explanation:

  • -10P: Max continuous 100A charge & discharge
  • -12P: Max continuous 120A charge & discharge
  • -15P: Max continuous 150A charge & discharge
  • -20P: Max continuous 200A charge & discharge

Letter suffix extra function: C=CAN, R=RS485, H=Heating, CR=CAN+RS485+Heating

Cell support: JK-BD6A20S = 7~20S; JK-BD6A24S = 21~24S; JK-BD6A20S-20P supports 14~20S LTO batteries

4. Main Electrical Specifications

4.1 100A / 120A / 150A / 200A Parameter Comparison

Item 100A 120A 150A 200A Unit
Supply Voltage 20~100 20~100 20~100 20~100 V
Continuous Charge/Discharge 100 120 150 200 A
Peak Instant Current 200 240 300 400 A
Max Balance Current 0.6 0.6 0.6 0.6 A
Operating Temp -30~70 -30~70 -30~70 -30~70 ℃
Dimension 162*102*20.4 162*102*20.4 162*102*20.4 162*102*20.4 mm
Net Weight 567 567 567 567 g
JK-BD6AxxS Dimension Drawing 162*102*20.4mm

4.2 Factory Default Voltage Parameters

Parameter LiFePO4 Ternary NCM LTO Titanate Unit
Cell Overcharge Cut 2.70 4.20 3.60 V
Undervoltage Protection 1.80 2.82 2.60 V
Auto Shutdown Voltage 1.70 2.80 2.50 V
Balance Trigger Gap 0.01 0.01 0.01 V

5. Interface & Wiring Definition

JK-BD6AxxS All Connector Pin Definition Diagram

Main Interfaces Summary:

  1. P1/P2: Cell balance sampling wire (B1~B24, B- total negative)
  2. P3: Dual NTC temperature sensor ports
  3. P4: CAN & RS485 communication multiplex port
  4. P5: UART port for GPS positioning module
  5. P6: LCD display screen dedicated port
  6. P7: Multi battery pack parallel control port
  7. P8: Buzzer alarm module port
  8. P9: ACC ignition & charger detection port
  9. D1: Heating wire connector; P-: Load/charger negative terminal
JK-BD6AxxS 7-24S Complete Wiring Diagram

Important Wiring Notice

  • Connect full balance sampling wire before power on, wrong wiring will burn MOS tube
  • B- and P- cannot be reversed
  • 7~20S battery packs leave empty sampling pins unused
  • 21~24S full string need all B1-B24 wires fully connected

6. Core Function Operation Guide

6.1 Active Balancing

Energy transfer balance transfers power from high voltage cells to low voltage cells automatically. Set battery type, capacity, balance gap inside Jikong APP. Default 0.6A balance current, recommend ≤0.2C of battery capacity.

6.2 Optional Functional Modules

  • Heating Function: 10A heating current, prevent low-temperature charging failure, match 45~65℃ thermal fuse for safety.
  • ACC Detection: Two trigger modes (12~70V input / short ACC+ACC-); C_Detect pin for charger wake-up.
  • Parallel Function: Work with parallel module, turn off charge limit inside APP to enable multi-pack parallel energy storage.
  • Emergency Mode: 30 minutes continuous charge/discharge output after activation for roadside emergency use.
  • Intelligent Sleep: Auto sleep if current <1A for 26h, wake by charger / physical button.

6.3 Full Protection Logic

All protections auto cut off charge/discharge and auto recover after temperature/voltage back to safe range, including overcharge, overdischarge, overcurrent, short circuit, high & low temperature protection.

7. Jikong B Mobile APP Operation

Jikong BMS APP QR Code & Operation Interface

7.1 APP Download

Scan QR code on product package, Android 7.0 & above / iOS all versions supported.

7.2 Three Activation Ways for BMS

  1. Charger activation: Charge voltage 2V higher than battery pack
  2. Physical button activation (optional display version)
  3. LCD screen plug-in wake-up

7.3 Parameter Setting Steps

1. Bluetooth connect BMS → enter Parameter page 2. Select battery type (LFP / NCM / LTO) 3. Set cell count, capacity, all protection voltage/current thresholds 4. Save settings, parameters take effect instantly

8. Application Scenarios

  • Home & Commercial Solar Energy Storage
  • RV, Camper, Golf Cart, Mobility Scooter
  • Shared EV & Low-Speed Electric Vehicles
  • Base Station Backup Power Supply
  • Large Off-Grid Battery Pack Systems
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