Battery Cell Defect Detection Using Electrical and Thermal Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery cell manufacturing processes suffer from low yields due to variability in electrochemical processes, with defect detection during formation and aging being time-consuming and costly, and current methods are inefficient at scale.
Innovation Solution
A method involving electrical measurements and controlled regional heating to characterize defect classes in battery cells by mapping electrical and structural domains, using electrothermal and electromechanical processes to diagnose specific defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional electrochemical processes are used for battery cell manufacturing, then cell formation and aging can be completed, but the process takes days to complete and yields remain below 80%
Solution Approach 1:
The patent applies preliminary action by performing defect detection measurements during the formation process itself rather than waiting for aging to complete. Electrical measurements are taken at multiple stages (during formation, after formation, during aging) to identify defects early, allowing defective cells to be removed from the process before they consume additional time in aging cycles. This early detection approach reduces the effective time required for the complete formation and aging process while improving yield.
2Measurement precision
If repeated cell measurements are performed during aging to detect defects, then defect detection capability is improved, but the process becomes time-consuming and cost-prohibitive at scale
Solution Approach 1:
The patent applies partial action by performing electrical measurements at strategically selected time points during formation and aging rather than continuous monitoring. Measurements are taken during formation, immediately after formation, and at selected intervals during aging. This approach provides sufficient defect detection capability to identify defective cells while avoiding the time and cost burden of continuous measurement, making the process scalable to millions of cells.
Solution Approach 2:
The patent replaces traditional mechanical/physical inspection methods with electrical measurement techniques for defect detection. By using electrical measurements to detect structural defects (such as separator punctures, electrode tears, and weld defects) during formation and aging, the system achieves high measurement precision without the time-consuming nature of physical inspection methods, enabling scalable defect detection.
3Reliability
If comprehensive defect detection is implemented, then product quality and safety are improved, but manufacturing cost becomes prohibitive at scale
Solution Approach 1:
The patent applies universality by using the same electrical measurement system and infrastructure for multiple purposes: monitoring cell formation, detecting structural defects, and assessing cell health during aging. The measurement system serves multiple functions throughout the manufacturing process, eliminating the need for separate specialized equipment for each function. This multi-functional approach reduces overall manufacturing cost while maintaining comprehensive defect detection capability.
Solution Approach 2:
The patent applies self-service by using the cell's own electrochemical properties and electrical characteristics to reveal structural defects. The measurement system exploits the cell's inherent electrical behavior during formation and aging to detect defects without requiring external tagging, markers, or additional materials. The cell essentially detects its own defects through its electrical response to applied stimuli, reducing manufacturing complexity and cost.
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
Improves defect detection efficiency, reduces production time, and increases yield by identifying defects early in the manufacturing process, allowing for dynamic process adjustments and improved cell formation.
Implementation Method 1
a first measurement is performed of a first quantity on the DUT prior to performing a first operation on the DUT
Implementation Method 2
mapping electrical and structural domains, using electrothermal and electromechanical processes to diagnose specific defects
Implementation Method 3
controlled regional heating to characterize defect classes in battery cells
Data Source
AI summary
Systems, methods, and devices for characterizing a defect of a device-under-test (DUT). A first measurement is performed of a first quantity on the DUT prior to performing a first operation on the DUT, producing a first result. The first operation is performed on the DUT, and subsequently a second measurement of the first quantity is performed on the DUT, producing a second result. A defect class is characterized for the DUT from a plurality of defect classes based on a difference between the first and second results.