BMS 2S 5A

Description

2S 5A Lithium Battery Management System (BMS)

The 2S 5A BMS is a miniature protection circuit board designed for 2-series (2S) Lithium-ion or Lithium-polymer battery packs (7.4V nominal / 8.4V max). This board is the standard choice for small-scale, low-power applications where physical size and core safety features are the primary requirements.

Technical Specifications

Key Functions & Protections

• Integrated Cell Balancing: Automatically manages the charge state of both cells, ensuring they remain balanced at identical voltage levels. This is critical for preventing “cell drift,” which can lead to premature battery failure.

• Compact Safety: Designed to protect against common lithium hazards: over-voltage during charging, under-voltage during discharge, and short circuits.

• Low-Power Optimization: Ideal for ultra-portable electronics where the total power draw is relatively light, allowing for a smaller, space-saving board design.

• Common Port Logic: Simplifies your wiring by utilizing the same terminal points for both the charging input and the device power output.

Important Installation & Safety Guidelines

• Wiring Sequence (Critical): To avoid damaging the control chip, solder wires in this exact order: 0V (B-), then 3.7V (B1/Balance lead), and finally 7.4V (B+). Never plug in a balance connector while the main battery circuit is under load.

• Charger Requirements: This BMS must be used with a dedicated 8.4V (2S) Lithium charger. Using an incorrect power source will prevent the BMS from balancing the cells properly and may result in an unsafe charge.

• Thermal Awareness: While rated for 5A, avoid running the board at this limit for long periods in a completely sealed or insulated enclosure, as the MOSFETs will generate a small amount of heat that needs to dissipate.

• Wire Gauge: Because this is a 5A board, 24AWG to 26AWG wire is generally sufficient for your load connections