Pressure Pad Sensor Calibration for Reliable Swelling Pressure Mapping
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Solution Overview
Problem
Existing technologies lack a reliable method to accurately measure and calibrate the output values of pressure sensing nodes in pressure pad sensors used for measuring the swelling pressure of lithium-polymer pouch-type secondary batteries, leading to inconsistencies due to manufacturing errors.
Innovation Solution
A pressure pad sensor pressing device and calibration method that applies uniform pressure to each sensing node, using a system of driving units and weight loading to record and display output values, followed by a linear interpolation method to derive standard pressure data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a jig including a load cell is used to measure swelling pressure, then measurement reliability is improved, but device complexity and cost increase
Solution Approach 1:
The pressure measurement function is segmented into multiple independent sensing nodes arranged in an array, where each node independently measures pressure at its location. This replaces the single load cell with a distributed sensor network that achieves comparable measurement reliability while reducing overall device complexity and cost.
Solution Approach 2:
The mechanical load cell is replaced with electronic pressure sensing nodes that convert mechanical pressure directly into electrical signals. This substitution reduces mechanical complexity while maintaining measurement reliability through electronic detection and processing.
2Measurement precision
If manufacturing precision of sensing nodes is improved to ensure consistent output, then measurement precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
Each sensing node includes feedback mechanisms that monitor its own output characteristics. The system collects data from all nodes and uses feedback loops to identify and compensate for manufacturing variations, ensuring consistent measurement results without requiring extremely tight manufacturing tolerances.
Solution Approach 2:
The system compensates for manufacturing variations by adjusting operational parameters of each sensing node individually. Through calibration procedures, the output characteristics of each node are tuned to match reference values, transforming physical manufacturing differences into adjustable electrical parameters.
3Measurement precision
If calibration procedures are implemented for each sensing node, then measurement precision is improved, but time consumption and process complexity increase
Solution Approach 1:
Calibration data and correction factors are pre-determined during the manufacturing process for each sensing node. This preliminary calibration eliminates the need for time-consuming on-site calibration procedures, as the nodes are already optimized for accurate measurement when deployed.
Solution Approach 2:
The sensing nodes perform self-calibration by comparing their output against reference measurements automatically. The system includes self-diagnosis and self-adjustment capabilities that eliminate manual calibration intervention, reducing both time and operational complexity.
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
This approach allows for accurate conversion of sensing node output values into reliable pressure values, enabling precise measurement of swelling pressure distribution in battery cells.
Implementation Method 1
Each sensing node may be composed of a force sensitive resistor (FSR) sensor using a property that a resistance value is changed according to physical force, weight, and the like.
Data Source
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AI summary
According to the present disclosure, there may be provided a pressure pad sensor pressing device including a pressing unit including a node pressing portion provided to descend from a predetermined height and contact one of the sensing nodes, and a weight loading portion provided at the top of the node pressing portion so that a weight load is transmitted to the node pressing portion; a support frame supporting the pressing unit at a predetermined height; and a first driving unit for moving the pressing unit in the first direction or in the reverse direction, a second driving unit for moving the pressing unit in the second direction or in the reverse direction, and a third driving unit for lifting and lowering the pressing unit with respect to the pressure pad sensor, and a calibration method capable of calibrating the output value of the sensing node to a reliable pressure value using the pressure pad sensor pressing device.