Battery Cell Pressure Inspection for Early Fault Detection
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Solution Overview
Problem
The manufacturing process of battery cells results in significant losses due to faulty cells being detected only after substantial investment, leading to high manufacturing costs.
Innovation Solution
A method for inspecting battery cells during manufacture by applying pressure and measuring electric charging characteristics to identify potential leaks, allowing early detection and removal of faulty cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery cells are tested only after the complete manufacturing process including activation, then the charging capacity can be determined, but substantial manufacturing losses occur due to faulty cells being detected too late
Solution Approach 1:
The patent applies preliminary action by performing an inspection method at an earlier stage during manufacture, before activation. The method charges battery cells to a first state of charge, applies pressure to simulate expansion, charges them to a second state of charge, and determines faulty cells based on charging characteristics. This early detection prevents substantial manufacturing losses that would occur if testing were delayed until after complete activation.
2Loss of substance
If battery cells are inspected earlier during manufacture before activation, then manufacturing losses are reduced, but the inspection method must be sufficiently reliable to detect faulty cells
Solution Approach 1:
The inspection method performs preliminary charging to a first state of charge before applying pressure, which prepares the battery cells in a controlled state that enhances the reliability of subsequent fault detection. This preliminary action ensures that the charging characteristics measured during pressure application are meaningful indicators of potential faults.
Solution Approach 2:
The method dynamically changes the state of charge of battery cells during inspection by charging them to different states (first and second states of charge) and applying pressure at specific stages. This dynamic approach allows the inspection to capture charging characteristics under varying conditions, improving the precision of fault detection.
3Reliability
If pressure is applied to simulate battery expansion during charging, then faulty cells with potential leaks can be identified, but the process becomes more complex
Solution Approach 1:
The patent merges the inspection process with the existing manufacturing and charging infrastructure. The method utilizes standard charging equipment to charge battery cells to different states of charge and applies pressure using available pressure application devices. By combining these functions into a integrated inspection sequence, the method improves fault detection capability without proportionally increasing overall process complexity.
Solution Approach 2:
The inspection method changes physical parameters systematically - charging battery cells to specific states of charge, applying controlled pressure to simulate expansion, and measuring charging characteristics. These parameter changes are implemented in a controlled sequence that enhances detection reliability while maintaining manageable process complexity through standardized parameter ranges and measurement protocols.
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
Reduces manufacturing losses by identifying and discarding faulty cells before activation, thereby minimizing costly and time-consuming activation processes.
Implementation Method 1
applying a pressure to the one or more battery cells; mechanically compresses the components of the cells such as the electrodes and the separators
Implementation Method 2
determining whether at least one of the one or more battery cells is faulty based on an electric charging characteristic of the one or more battery cells in reaction to applying the pressure
Data Source
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AI summary
A method for inspection of one or more battery cells during manufacture, the method comprising: charging the one more battery cells; applying a pressure to the one or more battery cells; and determining whether at least one of the one or more battery cells is faulty based on an electric charging characteristic of the one or more battery cells in reaction to applying the pressure.