Battery Pack Fault Isolation Using Voltage and Current Profiles
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Solution Overview
Problem
Existing systems struggle to accurately identify whether errors in a load with a mounted battery pack are due to the battery pack or the load itself, as they cannot differentiate between misuse or failure to provide sufficient energy.
Innovation Solution
A battery pack equipped with a voltage sensor, current sensor, and controller to measure and analyze voltage and current profiles, generating warning signals to determine if the error originates from the battery pack or the load based on specific time periods and reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system monitors battery pack operation, then it can detect errors occurring in the load, but it cannot identify whether the error originates from the battery pack or the load
Solution Approach 1:
The patent segments the error analysis into two distinct evaluation dimensions: voltage-based evaluation (comparing actual voltage to expected voltage to detect battery pack issues) and current-based evaluation (comparing actual current to expected current to detect load issues). This segmentation allows the system to independently assess each component's contribution to the error, thereby identifying the error source with precision while maintaining comprehensive error detection capability.
2Measurement precision
If the system uses voltage and current monitoring to detect errors, then error detection sensitivity is improved, but the complexity of determining the error cause increases
Solution Approach 1:
The patent implements a feedback mechanism where the control system continuously monitors voltage and current, compares them against expected values, and uses the comparison results to determine error causes. The system provides feedback by generating appropriate error codes based on the evaluation outcomes: voltage-based error codes when voltage deviation indicates battery pack issues, and current-based error codes when current deviation indicates load issues. This structured feedback approach simplifies the determination process despite high detection sensitivity.
Data Source
AI summary
Provided are a battery pack and a method of controlling the same, in which the battery pack includes a battery module supplying power to a load, a voltage measuring unit measuring a voltage of the battery module, a current measuring unit measuring a current output to the load from the battery module, and a control unit determining whether a cause of an error occurring in the load is the load or the battery pack, based on whether a warning signal corresponding to the voltage of the battery module is generated and whether a current value measured by the current measuring unit for a specific time period satisfies a current profile of the load.