Battery Cell Test Fixture for Simultaneous Force and Thickness Measurement
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Solution Overview
Problem
Existing devices for testing battery cells cannot simultaneously measure surface pressure and expansion, leading to inaccurate and incomplete characterization of battery cell properties.
Innovation Solution
A device with a first plate equipped with a thermal measuring element and a second plate with a contact element having an electrical connection and integrated temperature sensor, allowing simultaneous measurement of reaction force and change in thickness of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery cells are tested between two fixed metal plates using conventional clamping methods, then the test setup is simple and easy to operate, but surface pressure and expansion cannot be measured simultaneously
Solution Approach 1:
The patent combines multiple measurement functions (force measurement, displacement measurement, and temperature measurement) into a single integrated test device. The first and second plates are equipped with force measuring elements, displacement measuring elements, and thermal measuring elements, allowing simultaneous measurement of surface pressure, expansion, and temperature without requiring separate test setups.
Solution Approach 2:
The test device is designed with multi-functionality to measure multiple parameters simultaneously. The plates serve dual purposes as both clamping elements and measurement platforms, incorporating force measuring elements, displacement measuring elements, and thermal measuring elements to capture comprehensive battery cell data in a single test configuration.
2Measurement precision
If only stiffness and torque are adjusted in the test setup, then the device structure remains simple, but the accuracy and significance of battery cell tests are limited
Solution Approach 1:
The patent replaces conventional mechanical measurement methods with advanced sensing technologies. Instead of relying solely on mechanical stiffness and torque adjustments, the device incorporates force measuring elements, displacement measuring elements, and thermal measuring elements that provide precise digital measurements of surface pressure, expansion, and temperature, significantly improving test accuracy.
Solution Approach 2:
The patent introduces intermediary measurement elements between the clamping plates and the battery cell. These intermediaries (force measuring elements, displacement measuring elements, and thermal measuring elements) act as mediators that transmit and measure mechanical and thermal parameters, enabling accurate measurement of surface pressure and expansion without directly modifying the battery cell structure.
3Temperature
If thermal measuring elements and integrated temperature sensors are added to the plates, then temperature measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent merges temperature measurement functionality into the existing plate structure by integrating thermal measuring elements and temperature sensors directly into the first and second plates. This integration allows temperature measurement to occur simultaneously with force and displacement measurements without requiring separate temperature measurement equipment or additional complex setup.
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 precise and accurate measurement of battery cell properties, including surface pressure and expansion, improving the accuracy and meaningfulness of battery cell tests.
Implementation Method 1
at least one force measuring element arranged between a plate and a contact device for measuring a reaction force between the battery cell and the contact device
Implementation Method 2
the change in the thickness of the battery cell can be measured by means of at least one displacement measuring element
Implementation Method 3
at least one plate, preferably the first plate, has at least one thermal measuring element for measuring the cell body temperature of the battery cell
Implementation Method 4
a temperature sensor is integrated into at least one contact element
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
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).