Parallel Battery Module Voltage Synchronization
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Solution Overview
Problem
High-capacity battery systems with modules of different voltages connected in parallel face inrush current issues, which can lead to failures in battery modules or the entire system.
Innovation Solution
A battery system with parallel-connected modules, each equipped with a battery manager that detects voltage and controls switch circuits via a communication bus, managing terminal voltage by adjusting charge, discharge, and precharge switches based on module information to prevent inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery modules of different voltages are connected in parallel to form a high-capacity battery system, then the power capacity is improved, but inrush current occurs causing potential failures
Solution Approach 1:
The battery management system performs preliminary voltage detection and comparison before connecting battery modules in parallel. The controller identifies modules with voltage differences exceeding a threshold and prevents their simultaneous connection, thereby avoiding inrush current generation before it occurs
Solution Approach 2:
The system continuously monitors battery module voltages and uses this feedback information to control switching operations. By detecting real-time voltage levels and comparing them across modules, the system dynamically adjusts connection timing to prevent inrush current while maintaining high power capacity
2Ease of manufacture
If battery modules are connected in parallel without voltage synchronization, then the battery system can be assembled more easily, but inrush current causes module failures
Solution Approach 1:
Each battery module is equipped with its own management unit that autonomously detects its voltage level and communicates with the controller. The system uses this self-reported information to automatically coordinate switching operations, eliminating the need for complex external synchronization equipment while preventing inrush current
Solution Approach 2:
The system changes the operational parameters of individual battery modules by controlling their connection timing based on voltage levels. Modules with voltages exceeding the threshold are delayed in connection, transforming the connection sequence parameter to prevent inrush current while maintaining assembly simplicity
Data Source
AI summary
A battery system includes a plurality of battery modules connected in parallel. Each battery module includes a battery, a first output terminal and a second output terminal, a switch circuit connected between the battery and the first output terminal, and a battery manager to detect a battery voltage of the battery and control the switch circuit. Each battery manager is connected to other battery managers through a communication bus and transmits module information of a corresponding battery module to the other battery managers through the bus. Each batter manager also receives module information from the other battery managers through the bus and controls a corresponding switch circuit based on the module information.