Electrode Position Detection Using Optical Reflection
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Solution Overview
Problem
Existing methods for aligning positive and negative electrodes in secondary batteries, such as those described in Patent Literature 1, lack a specific method for ensuring accurate alignment, particularly when the bag-shaped separators and negative electrodes are of different sizes, leading to potential displacement and performance issues.
Innovation Solution
An electrode position detection device and method using a projector, light receiver, and detector to project light through separators and detect the relative positional relationship between packaged electrodes and other electrodes, ensuring accurate alignment by analyzing light reflections from the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outlines of separators and negative electrode are aligned, then positioning between electrodes is improved, but alignment accuracy deteriorates when separators and negative electrode are different in size
Solution Approach 1:
The patent introduces a marker as an intermediary element attached to the negative electrode. This marker serves as a reliable reference for alignment that is independent of the separator size, enabling accurate positioning even when separators and negative electrodes have different dimensions. The marker acts as a mediator between the alignment system and the electrodes, solving the adaptability problem.
Solution Approach 2:
The patent replaces the mechanical outline alignment method with an optical detection system using a projector and light receiver. This substitution allows for precise measurement of electrode positions through light projection and detection, achieving high positioning accuracy without relying on visual outline alignment that fails when sizes differ.
2Ease of manufacture
If outline alignment method is used, then stacking process is simplified, but detection precision of electrode positions deteriorates
Solution Approach 1:
The patent replaces the simple mechanical outline alignment method with an optical measurement system comprising a projector and light receiver. This system maintains ease of operation while dramatically improving measurement precision by using light projection to detect exact electrode positions, overcoming the limitations of visual outline alignment.
Solution Approach 2:
The patent introduces a marker as an intermediary that enables precise optical detection. The marker attached to the negative electrode serves as a reference point for the optical system, allowing accurate position detection without complicating the stacking process. This intermediary bridges the gap between simple stacking and precise measurement.
3Device complexity
If no specific alignment method is provided, then device complexity is reduced, but manufacturing precision of electrode stacking deteriorates
Solution Approach 1:
The patent introduces a marker as a simple intermediary element that enables precise alignment detection. This marker-based approach maintains relatively low device complexity while significantly improving manufacturing precision, as the marker provides a clear reference point for the optical detection system without requiring complex alignment mechanisms.
Solution Approach 2:
The patent replaces complex mechanical alignment mechanisms with a simpler optical detection system using a projector and light receiver. This substitution reduces device complexity compared to mechanical alignment systems while achieving superior manufacturing precision through optical measurement of electrode positions.
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
The solution effectively detects the relative positional relationship between electrodes, preventing displacement and ensuring accurate stacking, thereby enhancing battery performance and longevity.
Implementation Method 1
a projector configured to project light that penetrates the separator and is reflected by the first and second electrodes
Implementation Method 2
a light receiver configured to receive light reflected by the first electrode wherein the packaged electrode is positioned in the uppermost layer
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
An electrode position detection device configured to detect a relative positional relationship between a positive electrode (24) and a negative electrode (30) when a packaged electrode (20) and the negative electrode (30) are alternately stacked, the packaged electrode having the positive electrode (24) disposed inside a separator (40) formed in a bag shape. The device includes: a light source (76) configured to project light that penetrates the separator (40) and is reflected by the positive electrode (24) and the negative electrode (30); a camera (84) configured to receive the light reflected by the positive electrode (24) when the packaged positive electrode (20) is positioned on the uppermost layer and to receive the light reflected by the negative electrode (30) when the negative electrode (30) is positioned on the uppermost layer; and a detector (160) configured to detect the relative positional relationship between the positive electrode (24) and the negative electrode (30) based on the results of light reception by the camera (84) when the packaged positive electrode (20) is positioned on the uppermost layer and the results of light reception by the camera (84) when the negative electrode (30) is positioned on the uppermost layer.