Dual-Circuit Voltage Detection for Battery Fault Isolation
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Solution Overview
Problem
Existing voltage detection apparatuses for assembled batteries with series-connected battery cells face challenges in accurately determining faults, particularly short circuits, in dual-system configurations, which can lead to increased complexity and cost, and reduced fault determination speed.
Innovation Solution
A voltage detection apparatus with a dual-system configuration that includes two differential voltage detection circuits, a reference voltage supplying unit, a fault determining unit, and a voltage output circuit, where the third reference voltage is set to differ from the first and second reference voltages, allowing for accurate fault determination by identifying changes in voltage due to short circuits between the circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual-system configuration with two differential voltage detection circuits is used, then fault determination accuracy is improved, but device complexity increases
Solution Approach 1:
A third differential voltage detection circuit is introduced as an intermediary reference system. This third circuit detects the capacitor voltage independently and provides a reference value for comparing against the first and second detection circuits. By adding this intermediary reference, the system can determine faults in the dual configuration without requiring complex cross-comparison logic between the two main circuits, thus improving fault determination accuracy while managing system complexity.
2Reliability
If multiple differential voltage detection circuits are implemented, then fault detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The third differential voltage detection circuit serves multiple functions: it acts as a reference for fault detection, provides a backup detection path, and enables cross-validation of the first and second detection circuits. By designing the third circuit with the same structural characteristics as the first two, the system achieves multi-functionality that improves reliability without requiring fundamentally different or more expensive components, thus managing manufacturing cost while enhancing fault detection capability.
3Device complexity
If a single capacitor is used in a single-flying-capacitor configuration, then device complexity is reduced, but fault determination speed decreases
Solution Approach 1:
The voltage detection function is segmented into three independent detection circuits (first, second, and third) that simultaneously monitor the capacitor voltage. Each circuit operates independently and provides its own detection result. This segmentation allows parallel processing of voltage detection, enabling faster fault determination compared to sequential methods, while maintaining the simplicity of the single-capacitor configuration.
Data Source
AI summary
A voltage detection apparatus includes a capacitor and first and second differential voltage detection circuits. A reference voltage supplying unit supplies a first reference voltage from a first output terminal to the first differential voltage detection circuit, and supplies a second reference voltage from a second output terminal to the second differential voltage detection circuit. A fault determining unit determines a fault in the first or second differential voltage detection circuit based on a first voltage that is inputted from a first input terminal and a second voltage that is inputted from the second input terminal. A voltage output circuit is supplied a third reference voltage from a third output terminal between the first output terminal and the second output terminal, and outputs a third voltage to a third input terminal between the first input terminal and the second input terminal.