Secondary Battery Life Prediction Using Multi-Reference Electrode Impedance
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Solution Overview
Problem
Existing secondary battery life prediction methods do not accurately account for uneven degradation caused by heat generated from electrode tabs, leading to reduced prediction accuracy.
Innovation Solution
A secondary battery design with multiple reference electrodes positioned at different distances from the electrode tabs, allowing for impedance measurement and life prediction based on varying degeneration rates across the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference electrode is used for impedance measurement, then the device complexity is reduced, but the measurement precision is insufficient to detect uneven degradation across different battery regions
Solution Approach 1:
The patent divides the battery monitoring system into multiple segments by placing several reference electrodes at different positions within the battery case. Each reference electrode independently measures impedance in its local region, enabling detection of uneven degradation patterns that a single electrode would miss. This segmentation directly resolves the contradiction by improving measurement precision through spatial distribution of measurement points.
Solution Approach 2:
The patent transitions from a single-point impedance measurement to a multi-point spatial measurement system. By distributing reference electrodes throughout the battery volume, the system adds a spatial dimension to impedance monitoring, capturing degradation heterogeneity across different regions rather than providing only an averaged single-point measurement.
2Reliability
If multiple reference electrodes are positioned at different distances from the electrode tab, then the reliability of life prediction is improved by detecting regional degradation differences, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by positioning reference electrodes at specific locations with different distances from the electrode tab, where each location experiences different thermal and electrical conditions. This deliberate spatial arrangement allows the system to capture local degradation characteristics in high-stress regions versus low-stress regions, improving life prediction reliability by accounting for regional variations in degradation rates.
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 enables more accurate life prediction by detecting impedance changes across different regions of the battery, improving the accuracy of residual life estimation.
Implementation Method 1
an impedance measurement unit configured to measure an impedance associated with the selected reference electrode, based on an AC voltage between any one of the positive electrode tab and the negative electrode tab and the selected reference electrode with respect to an AC current of a predetermined frequency band
Implementation Method 2
as the secondary battery is repeatedly charged and discharged, the heat generated due to the contact resistance of the electrode tab accumulates irreversible damage to the secondary battery
Data Source
AI summary
Disclosed are a secondary battery and a life prediction apparatus thereof. The life prediction apparatus predicts a life of a secondary battery including an electrode assembly, a positive electrode tab, a negative electrode tab, a case and a plurality of reference electrodes. In particular, the life prediction apparatus predicts a residual life of the secondary battery by detecting impedances of different regions of the secondary battery by using the plurality of reference electrodes.