Conductive Material Composition for Temperature-Stable Pressure Sensing
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Solution Overview
Problem
Pressure sensors in battery environments suffer from significant resistivity changes due to temperature fluctuations, leading to detection errors and reduced sensitivity.
Innovation Solution
A conductive material comprising a mixture of temperature rise and temperature drop materials, with a controlled ratio to maintain resistivity stability across a wide temperature range, is used in the pressure sensor's sensitive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive material is used in pressure sensor, then the sensor can operate in battery environment, but the resistivity changes significantly with temperature causing detection errors
Solution Approach 1:
The patent uses a composite conductive material comprising two types of conductive particles: first conductive particles with positive temperature coefficient (resistivity increases with temperature) and second conductive particles with negative temperature coefficient (resistivity decreases with temperature). The composite structure allows the temperature-dependent resistivity changes of one particle type to compensate for the other, achieving overall temperature stability in the conductive material.
Solution Approach 2:
The patent carefully controls the ratio of first to second conductive particles in the conductive material. By adjusting this ratio, the overall temperature coefficient of resistivity can be tuned to achieve minimal temperature dependence. The mass ratio is specifically controlled within 1:9 to 9:1 to optimize temperature compensation while maintaining conductivity.
2Measurement precision
If temperature compensation is implemented, then detection sensitivity improves, but material composition complexity increases
Solution Approach 1:
The patent employs a composite conductive material consisting of two types of conductive particles with opposite temperature coefficients. This composite approach enables temperature compensation functionality while maintaining a relatively simple overall material system that can be integrated into existing pressure sensor designs without major structural modifications.
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 ensures minimal resistivity change with temperature, enhancing detection sensitivity and accuracy of pressure measurements in extreme and normal temperatures.
Implementation Method 1
the temperature rise material is a material having a resistivity that increases as the temperature rises, the temperature drop material is a material having a resistivity that decreases as the temperature rises, and a ratio of the temperature drop material to the temperature rise material is set so that within a temperature range of −40° C. to +200° C., an absolute value of a change rate of the resistivity of the conductive material is less than or equal to 0.01
Data Source
AI summary
The conductive material includes a flexible substrate and conductive particles dispersed in the flexible substrate, wherein the conductive particles comprise a temperature rise material and a temperature drop material, the temperature rise material is a material having a resistivity that increases as the temperature rises, the temperature drop material is a material having a resistivity that decreases as the temperature rises, and the ratio of the temperature drop material to the temperature rise material is set so that within a temperature range of −40° C. to +200° C., the absolute value of the change rate of the resistivity of the conductive material is less than or equal to 0.01. By mixing the temperature rise material and the temperature drop material, the resistivity of the mixed material does not change significantly when the temperature changes, such that the detection sensitivity of a sensor at different temperatures is improved.