Battery Case Pressure Analysis with Leak-Tight Gas Injection
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Solution Overview
Problem
Existing methods struggle to analyze the real-time pressure changes and gas volume within battery cases due to difficulties in simulating actual conditions without gas leakage, making it challenging to measure the limit pressure accurately.
Innovation Solution
An apparatus with a gas injection tube, pressure gauge, and mass flow controller, featuring a curing agent-filled penetrating hole and double sealing mechanism, allows real-time pressure measurement and gas injection control within battery cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas is injected into the battery case to measure limit pressure, then pressure measurement becomes possible, but gas leakage occurs at the injection point
Solution Approach 1:
The penetrating hole is divided into two functional zones: an upper portion that allows gas injection tube passage and a lower portion filled with curing agent for sealing. This segmentation enables simultaneous gas injection and leakage prevention by separating the injection function from the sealing function within the same hole structure.
Solution Approach 2:
The curing agent acts as an intermediary substance that fills the penetrating hole to create a gas-tight seal around the injection tube. It mediates between the need for tube insertion and the requirement for leakage prevention, forming a cured sealing structure that maintains both accessibility and hermeticity.
2Ease of operation
If gas injection tube is inserted through penetrating hole, then gas injection is enabled, but leakage path is created
Solution Approach 1:
The penetrating hole, which initially creates a potential leakage path, is transformed into a beneficial sealing structure by filling it with curing agent. The same hole that enables tube insertion becomes, after curing, a gas-tight barrier that prevents leakage while maintaining the injection capability.
Solution Approach 2:
The curing agent undergoes a parameter change from liquid state (when filling the hole) to solid cured state (after setting). This phase transition enables the sealing function, transforming the penetrating hole from a potential leakage path into a hermetic barrier while preserving tube accessibility.
3Measurement precision
If conventional gas injection method is used, then limit pressure can be measured, but real-time pressure change analysis is not possible
Solution Approach 1:
The gas injection system enables continuous pressure application and monitoring, allowing real-time measurement of pressure changes as gas is progressively injected. The mass flow controller maintains continuous gas supply while the pressure gauge continuously records pressure values, enabling dynamic analysis rather than discrete measurements.
Solution Approach 2:
The pressure gauge provides real-time feedback on the internal pressure of the battery case during gas injection. This feedback mechanism allows continuous monitoring and analysis of pressure changes, enabling determination of the limit pressure point when sealing failure occurs, thereby transforming static measurement into dynamic real-time analysis.
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 real-time analysis of pressure changes and gas volume within battery cases, preventing leakage and accurately determining the sealing limit pressure.
Implementation Method 1
the penetrating hole is filled with a curing agent while being penetrated by the gas injection tube
Data Source
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AI summary
The present disclosure relates to an apparatus and a method for analyzing a battery case, specifically, to the apparatus for analyzing the durability of various types of battery case, such as a pouch type or can type. The apparatus comprises a first plate which is in close contact with an outer surface of a first sheet, the first sheet forming one side of the battery case; a gas injection tube which is inserted into the battery case while penetrating through the first plate and extends along an inner surface of the first sheet; and a pressure gauge which is connected to the gas injection tube.