Acoustic Emission Sensor Array for Battery Internal State Detection
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Solution Overview
Problem
Conventional battery detection devices fail to accurately detect tiny elastic waves generated by chemical reactions within batteries, leading to difficulties in determining the internal state and location of changes such as bubble generation and component breakdown, which are crucial for battery performance and manufacturing quality control.
Innovation Solution
A detection device comprising a non-metallic plate and multiple AE sensors, with a coupling medium and elastic layer, that presses the battery to prevent wave damping and accurately analyze the detected elastic waves by comparing them to stored patterns, allowing for precise determination of reaction locations and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional AE sensor detection device is used, then the device structure is simple, but the detection precision of tiny elastic waves is insufficient due to wave damping
Solution Approach 1:
A coupling medium is introduced between the battery and the AE sensor to improve the transmission of elastic waves. The coupling medium acts as an intermediary that reduces wave damping and enhances the detection precision of tiny elastic waves generated during battery reactions, resolving the contradiction between simple device structure and high detection precision.
Solution Approach 2:
The AE sensor is designed with a curved surface that matches the curved surface of the battery. This curvature adaptation improves contact between the sensor and battery surface, reducing wave damping and enhancing detection precision without significantly increasing device complexity.
2Measurement precision
If pressure is applied to the battery during detection, then the transmission of elastic waves is improved, but the battery structure may be damaged
Solution Approach 1:
A restraining member with a curved surface is designed to press against the battery from the opposite side, providing preliminary support and cushioning. This prevents excessive deformation of the battery structure when pressure is applied to improve elastic wave transmission, thus protecting battery integrity while maintaining detection precision.
Solution Approach 2:
The pressure applied to the battery is carefully controlled and optimized to a specific range that is sufficient to improve elastic wave transmission but not high enough to damage the battery structure. By adjusting the pressure parameter within an optimal range, both wave transmission and structural integrity are maintained.
3Measurement precision
If multiple AE sensors are used to determine reaction location, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple AE sensors positioned at different locations on the battery surface. Each sensor detects elastic waves from its specific position, and by analyzing the signals from multiple segmented detection points, the precise location of reactions can be determined through signal comparison and triangulation.
4Measurement precision
If the battery is pressed during detection, then the elastic wave detection is improved, but the battery may undergo unwanted deformation
Solution Approach 1:
The restraining member provides preliminary support and distribution of applied pressure, cushioning the battery against excessive deformation. This allows sufficient pressure to be applied for improved elastic wave detection while maintaining the battery's original shape and structure.
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 accurate detection and visualization of internal battery states, including reaction locations and types, enhancing the assessment of battery performance and manufacturing processes by effectively transmitting and analyzing tiny elastic waves without damping.
Implementation Method 1
a coupling medium disposed between the battery and the non-metallic plate
Implementation Method 2
multiple AE sensors located on the non-metallic plate. The multiple AE sensors detect an elastic wave generated in the battery
Implementation Method 3
an elastic member disposed between the restraining member and the non-metallic plate
Data Source
AI summary
Provided is a device to sense battery internal state that can sense tiny elastic waves accompanying a reaction inside a battery and can accurately ascertain changes in battery internal state. The device (10) to sense the internal state of a battery (1) comprises restraining members (5, 5) that apply compressive force to the battery (1), a non-metallic plate (11) disposed between the battery (1) and a restraining member (5), and multiple acoustic emission sensors (13) affixed to the non-metallic plate (11). Compressive force is applied to the battery (1) by the restraining members (5, 5), elastic waves (W) generated in the battery (1) are sensed by the multiple acoustic emission sensors (13), and the internal state of the battery (1) is sensed by analyzing the sensed elastic waves (W).