Electrode Stack Edge Positioning via Multi-Angle 2D X-Ray
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Solution Overview
Problem
Existing methods for determining the accuracy of electrode leaf positions in a stack, such as computer tomography, are expensive and not suitable for real-time production, while cheaper two-dimensional X-ray systems cannot directly measure the position of electrode leaves relative to each other.
Innovation Solution
A procedure using a two-dimensional X-ray system with at least one X-ray source and a detector to capture multiple contours of the electrode leaves from different angles, allowing for the evaluation and determination of the positions of the edges of the electrode leaves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If computed tomography is used to determine positioning accuracy, then measurement precision is improved, but device cost increases significantly
Solution Approach 1:
The three-dimensional measurement problem is segmented into multiple two-dimensional measurements taken from different spatial coordinates. By capturing contours from multiple angles and combining them through evaluation, the system achieves accurate positioning determination using simpler, less expensive two-dimensional X-ray systems rather than requiring complex computed tomography equipment.
Solution Approach 2:
The patent transitions from two-dimensional contour measurements to three-dimensional positioning information by taking measurements from multiple spatial coordinates. The contours captured from different angles are evaluated together to reconstruct and determine the three-dimensional positions of electrode sheet edges, effectively using dimensional transformation to achieve CT-level precision with simpler equipment.
2Device complexity
If two-dimensional X-ray systems are used, then device cost is reduced, but measurement precision deteriorates because direct measurement of relative positions is not possible
Solution Approach 1:
Multiple contour measurements are taken from different spatial coordinates before evaluation. By capturing all necessary two-dimensional contour data from various angles in advance, the system prepares sufficient information that can be later processed to determine three-dimensional positions, enabling accurate measurement with cost-effective two-dimensional equipment.
Solution Approach 2:
The patent introduces an evaluation process that acts as an intermediary between multiple two-dimensional contour measurements and the final three-dimensional positioning result. This evaluation step combines the contour information from different spatial coordinates to reconstruct edge positions, serving as a computational mediator that bridges the gap between simple 2D measurements and accurate 3D positioning.
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 determination of electrode leaf positions within a stack, allowing for the assignment of deviations to specific electrode leaves, thereby improving the quality control of battery cell production without the need for expensive equipment.
Implementation Method 1
Irradiating the stack with the at least one beam source from a first spatial coordinate, wherein the beam direction is at least transverse to the planes and towards the detector, wherein a beam from the beam source detects the stacked edges of the electrode sheets
Data Source
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Figure 3~5
AI summary
Method for determining the placement accuracy of a plurality of electrode sheets (1, 2, 3), wherein the electrode sheets (1, 2, 3) extend in mutually parallel planes (4) and are arranged stacked on top of each other, forming a stack (5); wherein the placement accuracy describes the positions (6, 7, 8) of the edges (9) of all electrode sheets (1, 2, 3) relative to each other in the stack (5); wherein the method is carried out with a measuring device (10) comprising a two-dimensionally resolving X-ray system (11) with at least one X-ray source (12) and a detector (13).