1. Introduction and Overview
This manual provides essential information for the safe and effective use of the Bisida 14S BMS (Battery Management System) 50.4V/51.8V 50A Li-ion PCB Protection Board. This board is designed to protect 14-series lithium-ion battery packs, ensuring their longevity and safe operation through various integrated protection functions.
The Bisida BMS is engineered with an excellent protective integrated circuit (IC) and high-quality MOSFETs, contributing to its robust, long-lasting, and reliable performance. It is suitable for applications requiring a 14S Li-ion battery pack, such as electric bicycles or scooters.
Figure 1: Overview of the ten integrated protection features.
2. Safety Information and Protection Features
The Bisida BMS incorporates ten functional protections to safeguard your battery pack:
- Overcharge Protection: Prevents the battery from being charged beyond its safe voltage limit.
- Over-discharge Protection: Stops the battery from discharging below its safe voltage limit.
- Overcurrent Protection: Prevents excessive current flow during discharge.
- Short-circuit Protection: Automatically protects the battery in case of a short circuit.
- Temperature Protection: Monitors and protects the battery from extreme temperatures (low temperature protection up to -20°C and high temperature protection up to 70°C).
- Disconnect Protection: Safeguards the entire battery in case of circuit failure or disconnection.
- Voltage Balance (Passive Balance): Balances individual cell voltages to prolong battery life.
- Drop Protection: Protects the entire battery from circuit failure or disconnection.
- Electrostatic Protection: Features three-proof silicone electrostatic protection.
- Moisture Protection: Enhanced with a three-proof silicone seal.
- Dust Protection: Enhanced with a three-proof silicone seal.
Figure 2: Detailed explanation of specific protection features.
3. Setup and Installation
3.1 Pre-installation Notice
Before installing the BMS protective board, it is crucial to ensure that the individual battery cells within your pack are properly matched. This includes:
- The voltage difference between any two battery sections should not exceed 0.05V.
- The internal resistance difference between cells should not be more than 5MΩ.
- The capacity difference between cells should be less than 30mAh.
Failure to meet these matching requirements will prevent the battery pack from charging correctly.
3.2 Wiring Method (Common Port)
Follow these steps for wiring the BMS with common ports:
- Connect the B- terminal of the BMS to the negative terminal of the battery pack.
- Connect the C- terminal of the BMS to the charging negative and the output negative.
- All positive electrodes from the battery cells should be connected to the total positive pole of the battery pack.
Figure 3: The Bisida 14S 51.8V 50A Li-ion PCB Protection Board, showing connection points for battery pack integration.
Figure 4: Close-up view of the high voltage and low internal resistance MOS tube components on the BMS, contributing to stronger pressure resistance and low self-consumption.
4. Operating Instructions
The Bisida BMS is designed to operate with 3.7V lithium-ion batteries, supporting charging and discharging within a voltage range of 2.65V to 4.25V per cell. The integrated NTC temperature control probe ensures safe operation by monitoring the working temperature.
4.1 Operating Temperature Range
The BMS provides protection across a wide temperature range:
- Low temperature protection: Down to -20°C.
- High temperature protection: Up to 70°C.
These protections prevent the battery from damage due to ultra-low temperature charging/discharging and thermal runaway. Note that different voltages and currents may have specific parameter details; always refer to the detailed specifications for confirmation.
Figure 5: Close-up view of the NTC temperature control probe, essential for monitoring and protecting the battery within its operating temperature range.
5. Maintenance
To ensure the optimal performance and longevity of your Bisida BMS and the connected battery pack, consider the following:
- Voltage Balance: The passive balance function helps maintain balanced cell voltages, which is crucial for extending the overall lifespan of the battery pack. Regularly check the balance of your cells if possible.
- Environmental Conditions: Operate the battery pack and BMS within the specified temperature range (-20°C to 70°C) to prevent damage. Avoid exposure to excessive moisture or dust, although the BMS offers protection against these.
- Regular Inspection: Periodically inspect the wiring and connections for any signs of wear, corrosion, or loose contacts. Ensure all connections are secure.
6. Troubleshooting
If you encounter issues with your Bisida BMS or battery pack, consider the following troubleshooting steps:
- Battery Pack Not Charging: If the battery pack fails to charge after installation, revisit the pre-installation notice (Section 3.1). Verify that individual battery cell voltages, capacities, and internal resistances are properly matched. Mismatched cells are a common cause of charging issues.
- Protection Activation: If the BMS activates a protection function (e.g., short-circuit protection, overcurrent protection), it will automatically cease operation to protect the battery. Identify and remove the cause of the protection activation (e.g., remove the short circuit, reduce the load) to resume normal operation.
- Temperature-Related Issues: If the battery pack is not operating or charging in extreme temperatures, check if the ambient temperature is outside the -20°C to 70°C range. Allow the battery to return to a safe operating temperature.
7. Specifications
The following table details the key specifications and protection parameters for the Bisida 14S 50.4V/51.8V 50A Li-ion PCB Protection Board:
Figure 6: Detailed Li-ion data and protection parameters.
| Specification | Value |
|---|---|
| Brand | Bisida |
| Model Number | 14S 51.8V 50A |
| Model Name | Bisida 14S 50.4V/51.8V |
| Number of Batteries | Lithium Ion batteries required (14S configuration) |
| Battery Cell Composition | Lithium Ion |
| Voltage | 51.8V (Nominal) |
| Reusability | Rechargeable |
| Operating Temperature Range | -20°C to 70°C |
| Unit Count | 51.8 Count |
| UPC | 749755120877 |
8. Warranty Information
This Bisida 14S BMS 50.4V/51.8V 50A Li-ion PCB Protection Board is covered by a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and ensures the product functions as described under normal use. Please retain your proof of purchase for warranty claims.
9. Support
For technical assistance, inquiries regarding product functionality, or support with installation and troubleshooting beyond the scope of this manual, please contact Bisida customer support. Refer to the product packaging or the official Bisida website for contact details.