Battery Pack Isolation Fault Testing Without Load Interruption
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Solution Overview
Problem
Existing electrical energy storage systems require complete disconnection from the load for isolation fault testing, leading to operational interruptions and reduced availability.
Innovation Solution
A computer system with processing circuitry that detects isolation faults in electrical energy storage packs without interrupting the load by disconnecting and testing subsets of packs while others remain connected, allowing for continuous operation during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete disconnection from the load is performed for isolation fault testing, then testing accuracy is improved, but operational availability deteriorates
Solution Approach 1:
The battery pack system is divided into multiple independently testable modules or subsets. The control system can disconnect and test specific subsets while keeping other subsets connected to the load, enabling partial testing without complete system shutdown. This segmentation allows isolation fault testing to be performed on portions of the system while maintaining operational availability through the remaining connected subsets.
2Difficulty of detecting and measuring
If complete disconnection from the load is performed for isolation fault testing, then fault detection capability is improved, but productivity deteriorates
Solution Approach 1:
The control system performs preliminary assessment to identify which subsets of the battery pack can be disconnected without violating power requirements. By pre-evaluating the system state and determining safe disconnection targets, the system can proceed with isolation fault testing on selected subsets while maintaining load operation through remaining subsets, thus improving fault detection without sacrificing productivity.
Solution Approach 2:
Instead of performing complete disconnection for testing, the system applies partial action by disconnecting only the necessary subsets for testing while keeping other subsets connected. This partial disconnection approach provides sufficient fault detection capability for the tested subsets while maintaining operational continuity through the connected subsets, thereby improving productivity during testing.
3Measurement precision
If complete disconnection from the load is performed for isolation fault testing, then testing thoroughness is improved, but loss of time deteriorates
Solution Approach 1:
The system implements periodic isolation fault testing on different subsets of the battery pack over time. By rotating through multiple subsets in a periodic manner, the system achieves thorough testing coverage across all components while minimizing operational interruption at any given moment, as only a portion of the system is disconnected during each testing cycle.
Data Source
AI summary
A computer system has processing circuitry configured to detect an isolation fault of an electrical energy storage system comprising multiple electrical energy storage packs connectable to a voltage bus for providing power to an electric load; determine a subset of at least one of electrical energy storage pack that can be disconnected from the voltage bus without violating present power requirements for the electric load, wherein the following steps are repeated for each subset of at least one electrical energy storage pack until an isolation fault is detected in an electrical energy storage pack of the electrical energy storage system, or until all subsets of at least one electrical energy storage pack have been tested: disconnect a present subset of at least one electrical energy storage pack from the voltage bus; perform isolation fault check on the disconnected subset of at least one electrical energy storage packs while the other subsets of at least one electrical energy storage pack remain connected to the voltage bus, and provide a control message indicating the outcome of the isolation fault test.