Elastic Probe Insulation Testing for Pouch Cells
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Solution Overview
Problem
The existing methods for checking the insulation of pouch electric cells are unreliable and prone to damage due to point contact and inadequate dispersion of physical force, leading to potential explosions and difficulties in automation.
Innovation Solution
A method and apparatus using probes with conductive elastic contact portions made of materials like conductive silicon, which distribute physical force and ensure reliable electric contact by measuring electric characteristics such as resistance, current, or voltage between the electrode and aluminum layer of the pouch electric cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a probe makes point contact with the aluminum layer to measure insulation, then the measurement can be performed, but the physical force is concentrated causing pouch deformation and unreliable contact
Solution Approach 1:
The contact portion of the probe is segmented into multiple small contact points distributed across its surface, transforming a single concentrated contact point into multiple distributed contact points. This segmentation disperses the physical force applied to the pouch while maintaining electrical contact capability, preventing pouch deformation and ensuring reliable insulation measurement.
Solution Approach 2:
The probe contact portion is designed with non-uniform surface properties, creating multiple localized contact regions with different contact areas. This local quality variation allows the probe to adapt to the aluminum layer surface, ensuring reliable electrical contact while distributing mechanical stress to prevent pouch deformation.
2Reliability
If force is applied to ensure physical contact between probe and aluminum layer, then electric connection is maintained, but the pouch material cannot endure the force and deforms
Solution Approach 1:
The contact portion is divided into multiple contact regions that distribute the required contact force across several points rather than concentrating it at a single point. This segmentation maintains reliable electrical connection while reducing the force burden on any single point of the pouch structure.
Solution Approach 2:
The probe contact portion is pre-formed with a specific surface structure that facilitates multiple contact points before actual measurement. This preliminary structural preparation ensures that when the probe contacts the aluminum layer, the force is automatically distributed, maintaining connection reliability without compromising pouch strength.
3Productivity
If point contact is used for measurement, then the checking process can be performed, but the reliability is deteriorated and the process cannot be automated
Solution Approach 1:
The segmented contact portion provides consistent and reliable electrical contact that can be achieved through automated positioning without manual adjustment. The multiple contact points ensure stable measurement results, enabling automation of the insulation checking process while maintaining high reliability.
Solution Approach 2:
The contact portion parameters (surface area, contact point distribution, material properties) are optimized to provide reliable electrical connection with reduced force requirements. This parameter optimization enables automated systems to achieve consistent contact and measurement without the variability associated with manual point-contact methods.
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 enhances the reliability and safety of insulation checking, minimizes damage to the pouch electric cell, and facilitates automation of the process, reducing costs and time while ensuring accurate measurements.
Implementation Method 1
a contact portion made of conductive elastic material
Implementation Method 2
which may disperse or minimize a physical force occurring at physical contact between a probe and the pouch electric cell for measurement of electric characteristics to increase an electric contact area
Data Source
AI summary
To check insulation of a pouch electric cell, probes are contacted to an electrode of a pouch electric cell and an aluminum layer of a pouch of the pouch electric cell, respectively, and then an electric characteristic value between the probes is measured. The probe contacted with the aluminum layer has a contact portion made of conductive elastic material. Also, insulation of the pouch electric cell is determined by comparing the measured electric characteristic value with a reference value. Thus, physical characteristics of an outer periphery of a flexible pouch may be sufficiently exhibited in measuring or checking insulation of a pouch electric cell such as insulation resistance, thereby improving reliability of electric contact and minimizing physical damage or deformation of the pouch electric cell.