Battery Cell Deformation Scanning Across Charge States
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Solution Overview
Problem
Conventional methods for measuring deformation in battery cells are inadequate as they provide only point-specific measurements, fail to capture deformation across the entire surface, and do not account for different charge states.
Innovation Solution
A contactless deformation detection apparatus and method that uses a digital micrometer to continuously measure the outer diameter of battery cells across their entire surface at various charge and discharge states, providing a 4D representation of deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gages or optical gauges are used to measure deformation, then measurement can be performed at a specific point, but the deformation across the entire surface of the battery cell cannot be captured
Solution Approach 1:
The battery cell surface is divided into multiple measurement points arranged in a grid pattern. Multiple strain gages are placed at different locations (e.g., top, bottom, side surfaces) to capture deformation across the entire surface rather than at a single point, enabling comprehensive spatial mapping of deformation patterns.
Solution Approach 2:
The measurement system transitions from single-point measurement to multi-point spatial measurement by adding dimensional coverage. The deformation measurement is extended across multiple dimensions of the battery cell surface (top, bottom, side surfaces at different radial and axial positions), creating a comprehensive spatial deformation map.
2Device complexity
If traditional deformation measurement methods are used, then measurement setup is simple, but the system cannot account for different charge states of the battery cell
Solution Approach 1:
The measurement system continuously monitors deformation across multiple charge states (0%, 25%, 50%, 75%, 100% charge) and discharge states. The strain gages remain in place throughout the battery's operational cycles, capturing deformation data continuously as the battery transitions between different charge states without requiring reconfiguration.
Solution Approach 2:
The measurement system is designed to dynamically adapt to different operational conditions. The deformation measurement capability is integrated with the battery's charging/discharging cycles, allowing the system to capture time-variant deformation patterns as the battery transitions between static and dynamic states, enabling correlation of deformation with charge state.
3Device complexity
If point-specific deformation measurement is performed, then measurement equipment is simple, but the asymmetric and localized swelling of battery cells cannot be detected
Solution Approach 1:
The battery cell surface is divided into multiple measurement zones with strain gages positioned at critical locations including top surface, bottom surface, and side surfaces at different radial and axial positions. This segmentation enables detection of localized asymmetric swelling that would be missed by single-point measurement, capturing deformation patterns specific to different regions of the cell.
Solution Approach 2:
Different measurement locations on the battery cell are monitored independently to capture local deformation characteristics. The system identifies region-specific deformation patterns (e.g., localized swelling at electrode edges vs. uniform expansion), allowing differentiation between various failure modes and providing reliable detection of asymmetric deformation that indicates potential safety issues.
Data Source
AI summary
A deformation detection apparatus includes a cell movement-control assembly to handle a linear motion and a rotational motion of a battery cell, a body that supports the cell movement-control assembly, a digital micrometer, and control circuitry. The control circuitry controls a displacement of the battery cell between a first position and a second position along a longitudinal axis through a scanning region of the digital micrometer and a plurality of rotational positions of the battery cell at a plurality of charge states and a plurality of discharge states. The control circuitry measures a plurality of outer diameter values of the battery cell for a plurality of linear positions and a plurality of rotational positions along the longitudinal axis of the battery cell and determines a change in a geometrical shape (deformation and/or strain) of the battery cell for the plurality of linear positions and the plurality of rotational positions.