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source:Industry News release time:2025-08-21 Hits: Popular:AG11 battery

Management schemes for multi-series lithium battery packs are critical for ensuring safety, maximizing performance, and extending the lifespan of battery systems used in applications such as electric vehicles, energy storage, and portable electronics. A multi-series configuration, where cells are connected in series to achieve higher voltages, introduces unique challenges, including cell imbalance, overcharging, over-discharging, and thermal inconsistencies, which require sophisticated management strategies.
At the core of these schemes is the Battery Management System (BMS), a hardware and software solution that monitors and controls the battery pack. The BMS continuously tracks key parameters such as cell voltage, current, and temperature across each series string. Cell balancing is a primary function: when cells in a series deviate in voltage (due to manufacturing tolerances or aging), the BMS uses active or passive balancing to equalize them. Passive balancing dissipates excess energy from overcharged cells through resistors, while active balancing transfers energy from higher-voltage cells to lower-voltage ones using inductors or capacitors, improving overall efficiency.
Safety mechanisms are integral to the management scheme. The BMS implements over-voltage protection (OVP) and under-voltage protection (UVP) to prevent cells from exceeding safe voltage limits, which can cause thermal runaway or permanent damage. Over-current protection (OCP) and short-circuit protection (SCP) safeguard against excessive current during charging or discharging. Additionally, thermal management systems, controlled by the BMS, regulate temperature using cooling fans, heat sinks, or liquid cooling, ensuring cells operate within the optimal range (typically 20–45°C) to prevent degradation.
Communication and data logging are also key components. The BMS communicates with external systems (e.g., vehicle controllers or energy management systems) via protocols like CAN bus or Modbus, providing real-time data on battery state of charge (SOC), state of health (SOH), and fault conditions. This enables informed decision-making, such as adjusting charging rates or triggering alarms. Advanced BMS systems use machine learning algorithms to predict SOH and optimize charging profiles based on usage patterns, further extending battery life.
For large-scale applications, such as energy storage systems, management schemes often include modular designs, where multiple battery packs are connected in parallel and series. The BMS coordinates these modules to ensure uniform loading and prevent individual packs from bearing excessive stress. Redundancy features, such as backup sensors and communication paths, enhance reliability, critical for uninterrupted operation in industrial settings. By integrating these elements, management schemes for multi-series lithium battery packs ensure safe, efficient, and long-lasting performance across diverse applications.
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