Battery Cell Analyzer Leakage Detection
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Solution Overview
Problem
Current methods for detecting battery leakage are slow and do not provide information on leakage type at different states of charge, nor do they offer insights into prolonging battery life, as they measure only average current leakage and require high precision measurements.
Innovation Solution
Direct leakage current measurement methods, including static and dynamic modes, are used to rapidly and accurately detect leakage currents of less than 1 mA at various states of charge, employing a current source to hold the cell voltage and measure leakage current after transition time, and combining static and dynamic modes for semi-relaxed cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If self-discharge method is used for leakage detection, then measurement precision is improved, but detection time increases significantly
Solution Approach 1:
The system performs preliminary classification of leakage types by analyzing voltage changes at different states of charge before conducting full leakage measurement. This preliminary action divides the cell population into groups based on leakage characteristics, allowing subsequent measurements to be focused and accelerated.
Solution Approach 2:
The detection process is segmented into multiple stages: initial rapid classification at different SOC levels, identification of leakage types (ohmic, cathodic, anodic), and then targeted detailed measurement only for cells requiring further analysis. This segmentation reduces overall detection time while maintaining precision for cells that need it.
2Measurement precision
If high precision charge counting method is used for leakage detection, then measurement precision is improved, but detection time increases and feedback is delayed
Solution Approach 1:
Instead of charging cells to 100% state of charge for complete leakage assessment, the system performs partial charging to specific SOC levels (e.g., 30%, 70%, 90%) sufficient to identify leakage types and characteristics. This partial action provides timely feedback while achieving adequate measurement precision for classification purposes.
Solution Approach 2:
The system performs preliminary leakage characterization at intermediate SOC levels during the charging process before reaching full charge. This preliminary assessment at partial charge states provides early feedback on leakage types without requiring complete charging cycles, significantly reducing detection time.
3Device complexity
If average current leakage measurement is used, then device complexity is reduced, but information about leakage types and failure modes is lost
Solution Approach 1:
The system adds the dimension of state of charge analysis to leakage measurement. By measuring voltage changes at multiple SOC levels rather than a single average measurement, the system can distinguish between different leakage types (ohmic, cathodic, anodic) without requiring complex additional hardware. The multi-dimensional SOC-based measurement approach provides leakage type identification using standard battery test equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for rapid and accurate detection of leakage currents, reducing detection time and providing insights into battery health and longevity by distinguishing between different leakage types and failure modes.
Implementation Method 1
a voltage source to hold the battery cell voltage at a particular level
Implementation Method 2
Electrochemical batteries, each including one or more cells, are used to power many types of electrical and electronic devices
Implementation Method 3
measuring open circuit voltage (OCV) changes caused by self-discharge within the cell
Data Source
AI summary
An integrated circuit device includes a controller, a voltage source coupled to the controller, a voltage sampler coupled to the controller, a to current detector coupled to the controller and memory coupled to the controller, where memory includes code segments executable by the controller for: (a) measuring a cell voltage to determine an initial voltage; (b) holding the cell voltage at the initial voltage using a power source; and (c) determining the leakage current of the cell by the current provided by the current power source with a low current detector. The power source can be one or both of a voltage source and a current source.