Battery Cell Test Fixture for Force and Thickness Measurement
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Solution Overview
Problem
Existing battery cell testing devices fail to simultaneously measure surface pressure and expansion, limiting the accuracy and informative value of battery cell tests.
Innovation Solution
A device that measures reaction force and change in thickness of a battery cell using separate force- and displacement-measuring elements, allowing simultaneous and independent measurements, with strain gauge sensors for force measurement and inductive displacement sensors for thickness measurement, and integrated temperature and voltage sensors for continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate force- and displacement-measuring elements are used to simultaneously measure reaction force and thickness change, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measuring system is divided into separate force-measuring elements and displacement-measuring elements that are spatially separated and functionally independent. The force-measuring elements measure reaction forces while displacement-measuring elements measure thickness changes, allowing simultaneous measurement without mutual interference.
Solution Approach 2:
The pressing device serves as an intermediary component that transmits the pressing force through the force-measuring elements to the battery cell while allowing the displacement-measuring elements to independently measure thickness changes. This intermediary structure enables both measurement types to coexist without direct interference.
2Reliability
If force-measuring element and displacement-measuring element are arranged at different locations, then measurement independence is improved, but measurement accuracy may deteriorate
Solution Approach 1:
Different measuring elements are placed at optimally suited locations: force-measuring elements are positioned where they can accurately capture reaction forces, while displacement-measuring elements are positioned to accurately measure thickness changes. Each element operates at its optimal measurement location, ensuring both independence and accuracy.
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 characterization of battery cell properties, including stiffness, swelling, and breathing behavior, with improved accuracy and informative value through simultaneous force and displacement measurements, and a virtual calculation model to filter out apparatus interference.
Implementation Method 1
at least one force-measuring element arranged between a plate and a pressing device for measuring a reaction force
Implementation Method 2
at least one displacement-measuring element, with which the change in thickness of the battery cell can be measured
Data Source
AI summary
The invention relates to a device (1) for testing at least one battery cell (2), more particularly of a secondary battery, the device comprising: —a first plate (3) and a second plate (4), the battery cell (2) being clamped between the two plates (3, 4), which are preferably substantially rectangular, and at least one plate (4) being pressed against the battery cell (2) with a defined mechanical pressing force (F); and—at least one force-measuring element (13) disposed between one plate (3, 4) and at least one pressing device (9), for measuring a reaction force (R) between the battery cell (2) and the pressing device (9). According to the invention, in order to increase the accuracy and the informative value of tests of battery cells (2), at least one change in a thickness (D) of the battery cell (2) can be measured, preferably simultaneously with the reaction force (R), by means of at least one displacement-measuring element (15).