Battery Element Stack Inspection for Layer Edge Alignment
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Solution Overview
Problem
Existing battery manufacturing processes face challenges in achieving precise stacking of battery element layers, leading to potential short circuits and reduced chemical performance due to insufficient placement accuracy, which results in material waste and increased costs.
Innovation Solution
A method involving two test steps is employed to ensure accurate stacking: first, optical imaging to check edge distances within tolerance ranges, followed by X-ray irradiation to verify edge positions, using the differing absorption properties of anodes, cathodes, and separators to determine edge positions accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separator and anode are dimensioned larger than the cathode to create an overhang, then short circuit prevention is improved, but material consumption and costs increase
Solution Approach 1:
The patent applies preliminary action by performing quality control testing during the stacking process itself rather than after completion. The stacking machine is equipped with sensors that detect the position of battery element layers in real-time, allowing immediate identification and correction of stacking errors before the battery is finalized, thus preventing the need for excessive material dimensions as a preventive measure
Solution Approach 2:
The patent replaces the mechanical approach of using oversized components to ensure proper spacing with a sensing and detection system. The stacking machine uses sensors to optically or electronically detect the position of layers, substituting the need for physical overhang margins with precision measurement and control systems
2Manufacturing precision
If the placement accuracy of stacking machines is increased, then manufacturing precision is improved, but device complexity and costs increase
Solution Approach 1:
The patent introduces an intermediary sensing system between the stacking mechanism and the battery layers. This sensing system acts as a mediator that detects layer positions and provides feedback to the control system, enabling high precision without requiring the stacking machine itself to be excessively complex. The sensor system bridges the gap between mechanical stacking and precision requirements
Solution Approach 2:
The stacking machine incorporates a feedback mechanism where sensors continuously monitor the position of battery element layers during stacking. This real-time feedback allows the control system to adjust and correct positioning errors dynamically, achieving high manufacturing precision through closed-loop control rather than relying solely on mechanical precision
3Reliability
If quality control during manufacturing is improved to prevent short circuits, then reliability is improved, but testing time and productivity are reduced
Solution Approach 1:
The patent implements continuous quality control during the stacking process itself, rather than performing separate inspection steps after stacking. The sensing system operates continuously as layers are being stacked, detecting position errors in real-time and allowing immediate correction, thus maintaining production flow without interruption for quality checks
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
This method simplifies and speeds up the testing process, ensuring precise stacking while minimizing material waste and costs, thereby enhancing battery performance and production efficiency.
Implementation Method 1
optical imaging to check edge distances within tolerance ranges
Implementation Method 2
X-ray irradiation to verify edge positions, using the differing absorption properties of anodes, cathodes, and separators
Implementation Method 3
using the differing absorption properties of anodes, cathodes, and separators to determine edge positions accurately
Data Source
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AI summary
Method for testing a stack 1 of several battery elements, each comprising an anode 2a, a cathode 2b and a separator 3 as types of battery element layers, wherein the separator 3 is arranged between the anode 2a and the cathode 2b, and wherein: • in a first test step, it is checked whether edges of the battery element layers lie within a first tolerance range, wherein the battery elements for which this applies are determined as usable battery elements, • several of the usable battery elements are stacked to form the battery element stack 1, and • in a second test step, the battery element stack 1 is irradiated with X-rays emitted by an X-ray source 7 and detected by an X-ray detector 8, wherein the X-rays are oriented perpendicular to large areas of the battery element layers.and by means of the detected X-ray radiation, the positions of those edges of a type of battery element layers that define at least two of the corners of these battery element layers are determined, whereby it is checked whether the greatest distance between the edges located in the same position of all the battery element layers of the selected type lies within a second tolerance range.