Bagged Electrode Separator Breakage Detection via Dual-Sided Light Transmission
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Solution Overview
Problem
Existing methods for detecting separator breakage in battery elements, particularly in bagged electrodes, are ineffective in identifying breakages on the opposite side of the image capturing unit, leading to potential battery performance issues.
Innovation Solution
A detection method and device that irradiate light on a bagged electrode to distinguish between areas where light has passed through n-layers and n−1 layers of separators by capturing images and determining breakage based on brightness differences and edge distances, allowing for the detection of separator breakage regardless of its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is irradiated from above and an image is captured by an image capturing unit provided above, then breakage of a separator on the upper side can be detected, but breakage of a separator on the lower side cannot be detected
Solution Approach 1:
The patent introduces a second light source and second image capturing unit positioned below the bagged electrode, adding a new detection dimension. This dual-sided configuration enables light to pass through the separator from both upper and lower directions, allowing detection of breakages regardless of their position on the separator surface.
2Device complexity
If a single-sided detection method is used, then the device complexity is reduced, but the detection coverage is limited
Solution Approach 1:
The patent merges two complete detection systems (upper light source + image capturing unit, and lower light source + image capturing unit) into a coordinated detection apparatus. This combination ensures that both sides of the separator are detected simultaneously, improving reliability while maintaining manageable system complexity through integrated control.
3Measurement precision
If light transmission through multiple separator layers is used to detect breakage, then detection sensitivity is improved, but the ability to detect breakages at all positions is reduced
Solution Approach 1:
The patent segments the detection task into two independent detection paths: one for the upper separator surface and one for the lower separator surface. Each path uses light transmission through separator layers to detect breakages with high sensitivity. By segmenting the detection into multiple views, the system recovers complete detection information that would be lost in a single-sided approach.
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 the accurate detection of separator breakage, ensuring improved battery performance by identifying issues regardless of the separator's position relative to the image capturing unit.
Implementation Method 1
a first portion in which the light has been transmitted through n-layers of separators, and a second portion in which the light has been transmitted through equal to or less than n−1 layers of separators, will have mutually different brightness levels
Data Source
AI summary
A detection method in which light is irradiated on a bagged electrode, and an electrode is disposed inside of a bag-shaped separator for detecting breakage of the separator, the method includes capturing an image by irradiating the light onto the bagged electrode so that a first portion in which the light has been transmitted through n layers of the separator, and a second portion in which the light has been transmitted through equal to or less than n−1 layers of the separator, will have mutually different brightness levels, while capturing an image of the bagged electrode, detecting the first portion from the brightness of the image that is obtained by capturing the bagged electrode, and determining a breakage of the separator, based on the distance between edges of the first portion, and of an electrode portion where the light does not pass through.