Energy Storage Current Interruption for Discontinuous Overcurrent
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Solution Overview
Problem
Existing energy storage devices face inadequate protection against discontinuous overcurrents, as current interruption systems rely on a single threshold condition, failing to interrupt currents that temporarily fall below the threshold.
Innovation Solution
Implementing a protective apparatus with multiple conditions having different current and cumulative thresholds, where a control part calculates a cumulative value of times exceeding these thresholds, triggering current interruption when the cumulative value meets a set threshold, thereby enhancing protection against discontinuous overcurrents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single current threshold condition is used for current interruption, then the device complexity is reduced, but the reliability of protection against discontinuous overcurrent is insufficient
Solution Approach 1:
The patent segments the single current threshold condition into multiple current threshold conditions (first current threshold condition, second current threshold condition, etc.), each with different current thresholds and cumulative thresholds. This segmentation allows the system to detect and respond to different patterns of overcurrent, including discontinuous overcurrent that would be missed by a single threshold, thereby improving protection reliability without requiring complex external monitoring systems.
2Adaptability or versatility
If multiple current threshold conditions are implemented, then the protection coverage against various overcurrent patterns is improved, but the device complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality to handle multiple current threshold conditions simultaneously. It can calculate cumulative values for different current thresholds (first current threshold, second current threshold, etc.) and apply different cumulative thresholds accordingly. This universal design allows the same control unit to protect against various overcurrent patterns (continuous and discontinuous) without requiring separate dedicated circuits for each condition, thus achieving broad protection coverage while managing complexity.
Data Source
AI summary
A protective apparatus of an energy storage device includes a current breaker that interrupts a current of the energy storage device, and a control part. The control part calculates a cumulative value of times during which the current exceeds a current threshold, and executes current interruption processing of interrupting the current when the calculated cumulative value exceeds a cumulative threshold associated with the current threshold, and the control part counts, as the cumulative value, times during which the current continuously exceeds the current threshold, and in a case where the current falls from a state of exceeding the current threshold, the control part does not reset the cumulative value when a time during which the current is below the current threshold is equal to or shorter than a reset time.