Battery Cell Compression Bench With Decoupled Measurement Frames
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Solution Overview
Problem
Existing mechanical characterization benches for thin objects, such as battery cells, face challenges in accurately measuring thickness variations under stress due to frame deformation, which affects measurement precision and leads to potential false readings.
Innovation Solution
A mechanical characterization bench with a frame and mobile unit, featuring a compression face and measurement zone connected rigidly in the displacement direction but flexibly in orthogonal directions, using staggered recesses to minimize distortion and ensure precise displacement measurements, along with a force application system like an electric gear motor or hydraulic cylinder to apply controlled compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the frame is made rigid to provide stable measurement, then measurement stability is improved, but frame deformation under load increases which distorts measurement zones and reduces measurement precision
Solution Approach 1:
The frame is divided into modular sections with adjustable stiffness characteristics. Different portions of the frame structure can be optimized independently - some sections provide rigid support for stability while other sections are designed with controlled flexibility to accommodate load-induced deformation without distorting measurement zones.
Solution Approach 2:
The frame exhibits non-uniform stiffness distribution throughout its structure. Critical measurement zones are positioned in regions of high rigidity to ensure measurement stability, while other regions are designed with appropriate flexibility to absorb deformation. This localized optimization allows the frame to maintain both stability and measurement precision under varying loads.
2Stability of the object's composition
If the connection between compression zone and measurement zone is made rigid in all directions, then structural stability is improved, but deformation of compression zones distorts measurement zones causing false measurements
Solution Approach 1:
The connection between compression and measurement zones employs non-uniform stiffness characteristics. The connection is rigid in the direction of measurement (vertical/Z direction) to ensure accurate displacement transmission, while being flexible in orthogonal directions (X and Y directions) to accommodate lateral deformation of compression zones without transmitting it to measurement zones.
Solution Approach 2:
The connection structure is segmented into directional components with differentiated stiffness properties. This allows independent optimization of stiffness in the measurement direction versus orthogonal directions, enabling the connection to maintain measurement accuracy while absorbing deformation in non-critical directions.
3Productivity
If compression force is applied directly to the cell, then characterization efficiency is improved, but pressure distribution uniformity deteriorates leading to inaccurate mechanical properties
Solution Approach 1:
A compression plate is introduced as an intermediary element between the force application mechanism and the cell. This plate distributes the applied compression force uniformly across the cell surface, preventing localized stress concentrations while maintaining efficient force transmission. The plate acts as a mediator that decouples the direct force application from the cell, enabling both efficiency and uniformity.
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
The solution provides reliable and precise measurement of thickness variations under stress, reducing the risk of false measurements and enhancing the uniformity of pressure applied to the cell, allowing for detailed characterization of battery cells and other thin objects.
Implementation Method 1
at least one displacement sensor arranged so as to measure the displacement between the first compression face and the second compression face in the direction of the compression axis (Z)
Implementation Method 2
at least one force sensor interposed between the mobile assembly and the force application means
Implementation Method 3
application of a compression force along a given compression axis
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A bench for mechanically characterizing a battery cell through the application of a compression force, comprising a framework (2) carrying a lower compression assembly (EI) and an upper compression assembly (ES), means (5) for applying a compression force to the cell between the compression assemblies, and a force sensor (18). Each compression assembly (EI, ES) comprises a compression part and a frame surrounding the compression part. The compression part and the frame are at least in part mechanically disconnected. The frame of the upper compression assembly carries movement sensors (16) that measure the movement between the two frames.