1. Introduction
The JIKONG Smart BMS (Battery Management System) is an intelligent protection board designed for large-capacity series lithium battery packs. It integrates advanced features for comprehensive battery management and protection.
1.1. BMS Overview
This protection board is a management system tailored for large capacity series lithium battery packs. It features voltage acquisition, current active balancing, overcharge, over-temperature protection, coulomb meter, and Bluetooth communication. It is compatible with various battery types including lithium iron phosphate (LiFePO4), ternary lithium (Li-ion), lithium titanate (LTO), and sodium batteries.
The BMS utilizes energy transfer active balancing technology with independent intellectual property rights, achieving a maximum continuous 0.6A balance current. This technology ensures battery consistency, improves battery range, and delays battery aging.
A mobile APP, supporting Android and iOS operating systems, is available. The APP connects to the protection board through Bluetooth, allowing users to monitor battery status, modify parameters, and control charge/discharge switches. The compact design makes it suitable for various applications such as small sightseeing vehicles, mobility scooters, shared cars, high-power energy storage, base station backup power supplies, and solar power stations.
1.2. Functional Characteristics
- LED Bluetooth status indicator
- APP Bluetooth remote operation
- Battery capacity calculation
- High precision voltage acquisition (±3mV)
- High precision current acquisition
- Accurate time logging
- One-wire (Optional)
- LED battery level display (Optional)
- Support UART communication
- Charge overcurrent protection
- Charge overvoltage protection
- Charge over temperature protection
- Low temperature protection during charge
- Discharge overcurrent protection
- Discharge undervoltage protection
- Discharge over temperature protection
- Short circuit protection
2. Specifications
2.1. Product Parameters (60A Protection Board Basic Parameters)
The following table outlines the basic parameters for the 60A protection board, which is representative of the JK-BD6A24S12PD model's capabilities, noting the product title specifies 120A charge/discharge.
| Item | Parameter | Unit |
|---|---|---|
| Supply voltage | 20-100 | V |
| Operating power consumption | <800 | mW |
| Operating temperature | -30-70 | °C |
| Maximum number of collection strings | 24 | String |
| Maximum balancing current | 0.6 | A |
| Maximum charging current | 60 (Note: Product title specifies 120A) | A |
| Maximum discharge current | 60 (Note: Product title specifies 120A) | A |
| Maximum instantaneous current | 120 | A |
| Maximum internal loop resistance | 1.1 | mΩ |
| Protective plate size | 116.8*94.8*14.6 | mm |
| Finished weight | 327 | g |
2.2. Default Parameters
The following table lists the default parameters for various battery types. These can be adjusted via the APP.
| Parameter | Li-ion Default | LiFePO4 Default | LTO Default | Unit |
|---|---|---|---|---|
| Balancing initial voltage | 3 | 3 | 2 | V |
| Maximum balancing current | 0.6 | 0.6 | 0.6 | A |
| Unit overcharge voltage | 4.2 | 3.6 | 2.7 | V |
| Single overcharge protection recovery | 4.18 | 3.55 | 2.65 | V |
| Monomer undervoltage protection | 2.82 | 2.6 | 1.8 | V |
| Single undervoltage protection recovery | 2.85 | 2.65 | 1.85 | V |
| Automatic shutdown voltage | 2.8 | 2.5 | 1.7 | V |
| SOC-0% voltage | 2.9 | 2.6 | 1.85 | V |
| SOC-100% voltage | 4.18 | 3.5 | 2.65 | V |
| Trigger balancing differential pressure | 0.01 | 0.01 | 0.01 | V |
| Charging overcurrent protection delay | 30 | 30 | 30 | S |
| Charge overcurrent release time | 60 | 60 | 60 | S |
| Discharge overcurrent protection delay | 300 | 300 | 300 | S |
| Discharge overcurrent release time | 60 | 60 | 60 | S |
| Short-circuit protection delay | 5 | 5 | 5 | uS |
| Short circuit protection release time | 30 | 30 | 30 | S |
| Charging overtemperature protection | 70 | 70 | 70 | °C |
| Charge overtemperature restore temperature | 60 | 60 | 60 | °C |
| Discharge overtemperature protection | 70 | 70 | 70 | °C |
| Discharge overtemperature recovery | 60 | 60 | 60 | °C |
| Charging low temperature protection | -20 | -20 | -20 | °C |
| Charge low temperature to restore temperature | -10 | -10 | -10 | °C |
| MOS Overtemperature protection | 100 | 100 | 100 | °C |
| MOS Overtemperature protection recovery | 80 | 80 | 80 | °C |
| Device address | 0 | 0 | 0 | / |
3. Setup
3.1. Packing List
Upon opening the package, please verify that all items are present and in good condition:
- BMS x 1
- Sampling line x 1 (long 70cm)
- NTC x 1 (long 40cm)
- Switch x 1 (long 50cm)
3.2. Product Appearance and Dimensions
The JK-BD6A24S-4PD series protection board has dimensions of 116.8mm * 94.8mm * 14.6mm. Refer to the diagrams below for visual reference and detailed measurements.
3.3. Interface Definition
Understanding the various connectors and their pin definitions is crucial for correct installation. The following tables detail the interfaces on the BMS.
P1 Connector (HY2.0-15P) - Balance with Acquisition Interface
| Pin Number | Name | Definition |
|---|---|---|
| 1 | B- | Total negative battery |
| 2 | B1 | The first battery positive |
| 3 | B2 | The second battery positive |
| 4 | B3 | The third battery positive |
| 5 | B4 | The fourth battery positive |
| 6 | B5 | The fifth battery positive |
| 7 | B6 | The sixth battery positive |
| 8 | B7 | The seventh battery positive |
| 9 | B8 | The eighth battery positive |
| 10 | B9 | The ninth battery positive |
| 11 | B10 | The tenth battery positive |
| 12 | B11 | The eleventh battery positive |
| 13 | B12 | The twelfth battery positive |
| 14 | B13 | The thirteenth battery positive |
| 15 | B14 | The fourteenth battery positive |
P2 Connector (HY2.0-11P) - Balance with Acquisition Interface (Continued)
| Pin Number | Name | Definition |
|---|---|---|
| 1 | B15 | The fifteenth battery positive |
| 2 | B16 | The sixteenth battery positive |
| 3 | B17 | The seventeenth battery positive |
| 4 | B18 | The eighteenth battery positive |
| 5 | B19 | The nineteenth battery positive |
| 6 | B20 | The twentieth battery positive |
| 7 | B21 | The twenty-first battery positive |
| 8 | B22 | The twenty-second battery positive |
| 9 | B23 | The twenty-third battery positive |
| 10 | B24 | The twenty-fourth battery positive, Total battery positive |
| 11 | B+ | Protection board power supply, connected to the battery |
P3 Connector (HY2.0-2P) - Temperature Interface
| Pin Number | Name | Definition |
|---|---|---|
| 1 | TA | Temperature sensor pin A |
| 2 | TB | Temperature sensor pin B |
P3 Connector (HY2.0-4P) - 2 External Optional Temperature Interfaces
| Pin Number | Name | Definition |
|---|---|---|
| 1 | T1A | First temperature sensor pin A |
| 2 | T1B | First temperature sensor pin B |
| 3 | T2A | Second temperature sensor pin A |
| 4 | T2B | Second temperature sensor pin B |
P4 Connector (1.25T-6PWT) - One-wire Interface
| Pin Number | Name | Definition |
|---|---|---|
| 1 | GNDT | One-wire negative pole |
| 2 | TX | One-Wire signal |
| 3 | ... | Test interface |
| 4 | ... | Test interface |
| 5 | ... | Test interface |
| 6 | ... | Test interface |
P5 Connector (FPC06-Q0.5-9AH2.0) - Light Panel Interface
| Pin Number | Name | Definition |
|---|---|---|
| 1 | K+ | Activate the positive signal |
| 2 | K- | Activation signal negative electrode |
| 3 | LED- | Light panel signal negative pole |
| 4 | LEDIR | Light panel signal negative pole |
| 5 | LED1G | Light panel signal negative pole |
| 6 | LED2 | Light panel signal positive pole |
| 7 | LED3 | Light panel signal positive pole |
| 8 | LED4 | Light panel signal positive pole |
| 9 | LED5 | Light panel signal positive pole |
Bluetooth Connection Indicator (D1): When Bluetooth is connected to the protection board, the indicator is steady on. When the connection is disconnected, the indicator blinks.
P- Terminal: Connect to external load or negative terminal of charger.
B- Terminal: Connect to the negative battery terminal.
3.4. Installation Method
The JK-BD6A24S-4PD series protection board is suitable for 7-24 series lithium battery packs. The specific wiring method varies depending on the number of cells in the battery pack. A general wiring diagram is provided below.
Important: Ensure all connections are secure and correct before powering on the BMS. Incorrect wiring can lead to damage to the BMS or battery pack.
3.5. APP Installation
To install the mobile APP matching the product, scan the QR code below. An Android version 7 or higher is required for the Android APP.
4. Operating Instructions
4.1. Device Activation
Before starting the protection board, ensure the balance cable is properly connected and that P- and B- are correctly connected. Verify that the protection board is securely fixed to the battery cells. Once confirmed, power on the protection board.
The protection board does not have a power-on control switch. It is designed for charging activation mode, meaning the charger voltage must be 2V higher than the battery voltage. After assembling the battery, connect the charger to activate the protection board.
Alternatively, if you have the optional light panel, you can activate the BMS by inserting the cable into the light panel interface and pressing the button.
4.2. Active Equalization
The BMS uses active equalization to transfer energy from higher-voltage cells to lower-voltage cells, ensuring battery consistency. Before using this function, set the basic battery parameters in the JIKONG BMS APP, including battery type, number of cells, battery capacity, trigger equalization differential pressure (default can be retained), voltage calibration, and current calibration.
You can set the balance trigger pressure difference (mV) in the APP. When enabled, balancing automatically starts if the voltage difference between any two battery strings exceeds the set value, and stops when it falls below the set value. The default balance current is 0.6A, which can be adjusted based on your battery capacity. If not needed, the balancing function can be turned off in the BMS control page of the APP.
4.3. Communication Function
The protection board supports UART serial communication as standard. An optional one-wire communication function is also available. Users can configure the device address and communication protocol via the APP according to their specific needs. Refer to the Jikong Protection Board Communication Protocol Documentation for detailed protocols.
4.4. LED Battery Level Display Function
The BMS has an optional LED power level display function. If configured, a light panel can show the battery charge level. The light panel includes an activation switch to turn the protection board on or off.
| SOC | LED1 | LED2 | LED3 | LED4 | LED5 |
|---|---|---|---|---|---|
| 0%~9% | ○ | ○ | ○ | ○ | ○ |
| 10%~19% | ● | ○ | ○ | ○ | ○ |
| 20%~39% | ● | ● | ○ | ○ | ○ |
| 40%~59% | ● | ● | ● | ○ | ○ |
| 60%~79% | ● | ● | ● | ● | ○ |
| 80%~100% | ● | ● | ● | ● | ● |
Legend: ● = Green (always on), ○ = Off
4.5. Protection Functions
The BMS provides comprehensive protection features to ensure the safety and longevity of your battery pack. All protection parameters can be configured via the JIKONG BMS APP.
4.5.1. Charge Overvoltage Protection and Recovery
The BMS is equipped with charge overvoltage protection. Users can set the single overcharge protection voltage and recovery voltage in the APP. If any battery string exceeds the set overvoltage during charging, the BMS will stop charging. Charging resumes when all cell voltages drop below the recovery voltage, preventing overcharging and cell damage.
4.5.2. Discharge Undervoltage Protection and Recovery
The BMS includes discharge undervoltage protection. Users can set the battery undervoltage protection voltage, recovery voltage, and automatic shutdown voltage in the APP. If any cell voltage falls below the protection voltage during discharge, the BMS will trigger undervoltage protection and stop discharging. Discharge resumes when all cell voltages rise above the recovery voltage. If any cell voltage drops below the automatic shutdown voltage, the BMS will automatically shut down to protect the battery.
4.5.3. Charge Overcurrent Protection and Recovery
Charge overcurrent protection is standard. Users can set the continuous charging current, overcurrent delay, and release time in the APP. If the charging current exceeds the set continuous current for the specified delay, the BMS will stop charging. Charging resumes after the set release time.
4.5.4. Discharge Overcurrent Protection and Recovery
Discharge overcurrent protection is standard. Users can set the continuous discharge current, overcurrent delay, and release time in the APP. If the discharge current exceeds the set continuous current for the specified delay, the BMS will stop discharging. Discharge resumes after the set release time. Note: The maximum continuous discharge current should not exceed the design value (e.g., 120A for this model).
4.5.5. Over Temperature Protection and Recovery
The BMS features charge and discharge overtemperature protection. Users can set the protection and recovery temperatures for both charging and discharging in the APP. If the BMS detects a temperature above the set protection value, it will stop the respective operation (charging or discharging). The operation resumes when the temperature drops below the recovery value.
4.5.6. Low Temperature Protection and Recovery
Charge low temperature protection is standard. Users can set the protection and recovery temperatures for charging in the APP. If the BMS detects a temperature below the set protection value during charging, it will stop charging. Charging resumes when the temperature rises above the recovery value.
4.5.7. Short Circuit Protection and Recovery
Short circuit protection is standard. Users do not need to set the trigger current, but can adjust the short circuit protection delay (uS) and recovery time (S) in the APP. If a short circuit occurs during initial charging or discharge, increasing the delay time can help prevent false triggers due to high instantaneous currents from the charger or capacitive loads.
4.6. Emergency Switch
The BMS includes an emergency switch function. If issues like over-temperature, over-discharge, over-charge, or cell string drops occur during normal use, activating the emergency switch in the APP's BMS control page will enable charge and discharge for 30 minutes. This provides an emergency operating window, even if a single cell voltage reaches the automatic shutdown level, to prevent critical situations like being stranded.
4.7. Intelligent Sleep
The BMS features an intelligent sleep function. Users can enable or disable this in the APP. Its purpose is to reduce the BMS's self-consumption by entering a sleep state when the charge/discharge current is less than 1A for 26 consecutive hours. The BMS can be reactivated by pressing a button (if a light panel is installed) or by connecting a charger.
4.8. Parameter Setting
All operational parameters and protection thresholds can be customized through the JIKONG BMS mobile application. Refer to the "Instructions for Setting Protection Board Parameters" within the APP or the full PDF manual for detailed guidance on adjusting these settings.
5. Maintenance
The JIKONG Smart BMS is designed for reliable operation with minimal maintenance. However, regular checks and proper handling can extend its lifespan and ensure optimal performance:
- Visual Inspection: Periodically inspect the BMS and its connections for any signs of damage, corrosion, or loose wiring.
- Software Updates: Keep the mobile APP updated to the latest version to benefit from new features, improvements, and bug fixes.
- Parameter Review: Occasionally review the parameter settings in the APP to ensure they are still appropriate for your battery pack's condition and usage patterns.
- Environmental Conditions: Ensure the BMS operates within its specified temperature range (-30°C to 70°C) and is protected from excessive moisture or physical impact. The aluminum alloy shell provides good heat dissipation and protection against external environments.
6. Troubleshooting
This section provides guidance on common issues and their potential solutions. For more complex problems, refer to the detailed PDF manual or contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| BMS not activating after installation | Incorrect wiring (P- or B-), balance cable not connected, insufficient charger voltage. | Verify all wiring connections (P-, B-, balance cable). Ensure charger voltage is at least 2V higher than battery voltage for activation. If optional light panel is installed, try activating via the button. |
| Battery not charging | Charge overvoltage protection, charge overcurrent protection, charge overtemperature protection, low temperature protection. | Check cell voltages, charging current, and temperature via APP. Allow conditions to return to normal or adjust protection parameters if appropriate. |
| Battery not discharging | Discharge undervoltage protection, discharge overcurrent protection, discharge overtemperature protection. | Check cell voltages, discharge current, and temperature via APP. Charge battery if undervoltage. Allow conditions to return to normal or adjust protection parameters if appropriate. |
| Frequent short circuit protection triggers | High instantaneous current from charger or capacitive load, short circuit in external wiring. | Verify external wiring for actual short circuits. Increase short circuit protection delay in APP if false triggers occur due to high inrush currents. |
| BMS enters intelligent sleep unexpectedly | Low charge/discharge current for extended period. | This is normal behavior if current is below 1A for 26 hours. Reactivate by charger or light panel button. Adjust intelligent sleep settings in APP if desired. |
| APP connection issues | Bluetooth not enabled, BMS not powered, APP version outdated, phone OS not compatible. | Ensure Bluetooth is enabled on phone. Verify BMS is powered on. Update APP to latest version. Check phone OS compatibility (Android 7+). |
7. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase. The manufacturer, Chengdu Jikong Technology Co., Ltd., is committed to providing high-quality products and support.
You can also refer to the comprehensive PDF user manual for detailed information and advanced settings. The PDF manual is available for download via the QR code provided in the setup section or through the manufacturer's official website.
