Piezoelectric Thickness Sensor for Secondary Battery Electrode
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Solution Overview
Problem
It is difficult to observe and measure the variation in thickness of the electrode assembly in secondary batteries, as the assembly is sealed within an opaque battery case, hindering real-time diagnosis and performance improvement.
Innovation Solution
An apparatus is introduced that includes a piezoelectric element inserted through an observation hole in the battery case, supported by a support member, which generates a voltage signal based on the electrode's thickness variation, allowing for real-time measurement. This apparatus may also include a blocking layer and sealing member to enhance sealing and optical monitoring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery case is made opaque and sealed to protect the electrode assembly, then the reliability and safety of the battery is improved, but the ability to observe and measure electrode thickness variation is lost
Solution Approach 1:
The battery case is segmented by creating an observation hole that allows the piezoelectric element to contact the electrode assembly while maintaining the sealed structure. This segmentation enables measurement functionality without compromising the overall sealing and safety of the battery case.
Solution Approach 2:
The piezoelectric element acts as an intermediary between the external measurement system and the internal electrode assembly. It converts mechanical thickness changes into electrical signals that can be measured externally, enabling observation without direct optical access through the opaque case.
2Reliability
If the electrode assembly is sealed within the battery case to prevent contamination, then the reliability of the battery is improved, but real-time monitoring of electrode changes during operation becomes difficult
Solution Approach 1:
The piezoelectric element provides real-time feedback on electrode thickness changes during battery operation. This feedback mechanism allows continuous monitoring of electrode state without compromising the sealed structure, enabling real-time data collection while maintaining battery reliability.
Solution Approach 2:
The piezoelectric element is self-contained within the sealed battery case, requiring no external intervention to function. It automatically converts electrode thickness changes into measurable electrical signals, enabling self-monitoring of the electrode assembly while maintaining the sealed environment.
3Measurement precision
If a piezoelectric element is inserted through the battery case to measure electrode thickness, then the measurement capability is improved, but the sealing of the battery case is compromised
Solution Approach 1:
The battery case is segmented by creating a controlled opening for the piezoelectric element while maintaining the sealed structure. This segmentation allows measurement functionality without compromising the overall sealing and safety of the battery case.
Solution Approach 2:
A sealing member with elastic properties is used to seal around the piezoelectric element, allowing for thermal expansion and contraction while maintaining the seal. This flexible sealing approach preserves the battery case's compositional stability while accommodating the measurement element.
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
Enables real-time measurement of electrode thickness variations during electrochemical reactions, combining electrical and optical measurement methods for effective monitoring and diagnosis.
Implementation Method 1
the variation in thickness of the electrode is measured by using a voltage signal generated in the piezoelectric element according to an increase in thickness of the electrode provided in the electrode assembly
Data Source
AI summary
The present invention relates to an apparatus for measuring a variation in thickness of an electrode of a secondary battery, which is capable of measuring a variation in thickness of the electrode of the secondary battery, and a secondary battery with the same mounted therein. Also, the apparatus for measuring a variation in thickness of the electrode of the secondary battery includes a piezoelectric element inserted into a case by passing through an observation hole defined in the case, in which an electrode assembly is accommodated, and having an inner end supported by the electrode assembly and a support member installed outside the case to support an outer end of the piezoelectric element, wherein the variation in thickness of the electrode is measured by using a voltage signal generated in the piezoelectric element according to an increase in thickness of the electrode provided in the electrode assembly.