JBD Smart BMS User Manual

1. Product Introduction

The JBD-DB24SA01 is a smart Battery Management System (BMS) designed for 8-24 series lithium-ion (Li-ion) and lithium iron phosphate (LiFePo4) battery packs. It features a sophisticated architecture with a Deve chip for front-end acquisition and a Telink MCU. Key parameters can be flexibly adjusted via an upper computer interface to meet specific customer requirements. This BMS supports continuous currents from 100A to 200A and includes built-in Bluetooth (BT), UART communication, and temperature sensors.

2. Specifications

2.1. General Parameters

2.2. Li-ion Battery General Parameters (3.7V)

2.3. LiFePo4 Battery General Parameters (3.2V)

3. Setup and Installation

3.1. Wiring Diagram

3.2. Battery Connection Steps

1. Connect the negative pole of the battery to the B- terminal on the BMS.
2. After connecting the detection lines to the battery cells, insert the protective board J2 (high string count cable) first, then insert J1 (low string count cable). The insertion time for J2 and J1 should be less than 30 seconds. Caution: Do not solder the battery cells after inserting the ribbon cable into the BMS, as this may damage the protective board.
3. Finally, connect the negative pole of the load or charger to the C-/P- line.

3.3. Port Definitions

For detailed pinout configurations for J1 and J2 based on battery string count (8S-24S), please refer to the wiring configuration tables in the official PDF manual (pages 15-16).

3.4. Bluetooth Antenna Installation

The BMS Bluetooth antenna should be installed near the socket or in a location with weak shielding on the casing. After installing the casing, use a mobile phone 1 meter away from the battery and test the signal strength to be greater than -70dB.

4. Operation

4.1. Mobile APP (Xiaoxiang Electric)

The self-developed "Xiaoxiang Electric" mobile APP (available for Apple/Android) allows real-time monitoring and modification of various battery data. It automatically switches with the system language.

• Monitor: SOC (State of Charge), voltage, current, temperature, differential pressure, alerts, number of cycles, and record data.
• Modify: Adjust protection parameters and other settings.

4.2. PC Upper Computer (UART BOX)

The UART BOX (optional) allows free adjustment of protection board parameters such as voltage, current, and temperature. It also enables upgrading firmware and recording BMS data.

• Connection Method: After installing the special driver for the communication box, insert its USB end into the computer's USB port. Connect the other end to the corresponding interface of the BMS. Open the upper computer software, select the correct COM port, and click 'Start' to read data.
• Parameter Modification: If you need to change BMS parameters, you must first click 'Read Parameters' on the parameter page before making changes.
• COM Settings: Baud rate: 9600; Parity Bit: NONE; Data Bit: 8 bits; Stop Bit: 1 bit.

4.3. Optional Touch Display

An optional touch display (SMART BATTERY LCD) can provide multiple battery information in real-time through various interface switching. It also supports touch control for charging and discharging switches.

4.4. Heating Function

The BMS includes a heating function to maintain optimal battery temperature. When the battery temperature falls below a set threshold and the BMS detects a charging state, the heating MOS will activate, connecting the heating film's negative electrode to the charging negative electrode. The heating film's positive electrode should be connected to the battery's positive electrode and the charger's positive electrode.

Important: For battery packs with a heating film, the charger's power must be greater than the heating film's power to prevent damage to the heating function.

5. Maintenance and Environmental Conditions

5.1. Working Environment

The BMS is designed to operate normally under the following conditions:

• Ambient Temperature: -20°C to 75°C
• Relative Humidity: 5% to 90%
• Atmospheric Pressure: 86kPa to 106kPa

5.2. Storage Environment

For optimal longevity, the BMS should be stored in a clean, well-ventilated warehouse with an ambient temperature of -5°C to 40°C and relative humidity not exceeding 70%. The air must be free of corrosive gases and media that could affect electrical insulation. Avoid mechanical shock or heavy pressure. Do not expose to direct sunlight, and maintain a distance of at least 2m from heat sources (e.g., heating equipment). Under these conditions, the BMS can be stored for up to one year.

5.3. General Care

• When assembling, ensure the BMS does not directly touch the cell surface to prevent damage.
• During use, avoid touching components on the circuit board with lead tips, soldering irons, or solder, as this may cause damage.
• Do not use paste flux when soldering this circuit board, as it may cause abnormal operation.
• Pay attention to anti-static, moisture-proof, and waterproof measures during use.

6. Troubleshooting and Precautions

6.1. Common Issues and Solutions

• No voltage output or charging failure after initial power-on: Check if the wiring is correct.
• BMS burned out or battery damaged: This can occur if the battery type does not match the BMS type (e.g., LFP nominal voltage 3.2V vs. NMC nominal voltage 3.7V). Ensure the BMS type matches your battery.
• Excessive current causing damage to BMS: This can happen if the battery strings are not within the range supported by the BMS, or if the number of strings is inconsistent. Ensure your battery pack string count is compatible.
• BMS unable to carry actual current: If the calculated protection current (Load power / (nominal voltage * 2)) is too small, the BMS may not function correctly. Select a BMS with a continuous current greater than the controller's limit.
• Incorrect wiring: When soldering battery leads, ensure no wrong or reverse connections. Incorrect connections can damage the circuit board.

6.2. Important Precautions

• This battery management system cannot be used in series.
• The short-circuit protection function is suitable for various applications, but its effectiveness is not guaranteed under all conditions. Test the system if the battery pack's internal resistance is very low, capacity exceeds rated value by 20%, short-circuit current exceeds 2000A, or the short-circuit loop has very high inductance or length.
• Always follow the design parameters and conditions of use. Do not exceed the values specified in this manual, as it may damage the management system.
• The parameters, functions, and appearance of the BMS in this specification are for reference only; the actual product shall prevail.

7. User Tips

• For new battery installations, set the nominal and cycling capacity in the APP/PC software, then perform a capacity learning cycle (discharge to low voltage protection, charge to overvoltage protection, then discharge) to ensure accurate capacity readings.
• The BMS has a sleep function that activates after 1 minute of no communication, current, equalization, or overvoltage protection. Communication, switching, or charging/discharging will automatically exit sleep mode.
• The BMS also has a built-in storage and transportation (shutdown) mode. If any single cell voltage drops below the undervoltage protection value and does not recover within 120±40s, the BMS enters this mode, disabling discharge and reducing power consumption. Connecting a charger or communication module (RS485, CAN) will exit this mode.

8. Warranty and Support

For detailed warranty information, technical support, and service inquiries, please refer to the official product documentation or contact your vendor. The manufacturer strives to provide high-quality products and support.

An official user manual in PDF format is available for download: View User Manual (PDF).