Battery Cell Leak Testing Using Internal Vapor Detection
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Solution Overview
Problem
Existing leak testing methods for battery cells require additional gases or are not suitable for sealed cells, leading to inefficiencies and incompatibility with industrial processes, and often result in system contamination and unreliable measurements.
Innovation Solution
A method and system for leak testing sealed battery cells by detecting gases and vapors already present or generated within the cell, using a vacuum chamber and mass spectrometer, with heating and pressure control to prevent residue buildup and enhance detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional tracer gas (e.g., helium) is inserted into the cell for leak testing, then leak detection capability is improved, but device complexity and process time increase
Solution Approach 1:
The invention extracts and detects substances that are already present inside the battery cell (electrolyte vapors, decomposition gases) and uses them as natural tracers for leak detection, eliminating the need to introduce additional tracer gases into the system
Solution Approach 2:
The battery cell's own internal substances (electrolyte and decomposition products) serve as the detection medium, allowing the system to use what is already available within the cell rather than requiring external addition of test substances
2Measurement precision
If additional tracer gas is inserted into the cell during electrolyte insertion, then leak testing of finished cells is enabled, but contamination of the mass spectrometer occurs
Solution Approach 1:
The method detects substances naturally present or generated within the cell (electrolyte vapors, decomposition gases) rather than introducing external tracer gases, thereby eliminating the source of contamination to the mass spectrometer
Solution Approach 2:
The invention converts potentially harmful decomposition gases and electrolyte vapors, which were previously considered contaminants, into useful detection signals for leak identification
3Ease of operation
If leak testing is performed on unfinished cells before sealing, then leak detection is simplified, but the test does not reflect actual sealed cell conditions
Solution Approach 1:
The sealed cell performs its own leak detection by allowing its internal substances to escape through leaks and be detected by the mass spectrometer, providing authentic representation of sealed cell integrity without requiring external intervention or opening the cell
Solution Approach 2:
The method changes the detection parameter from requiring open cell access to detecting substances that escape through leaks from sealed cells, enabling testing under actual operating conditions
4Measurement precision
If residue buildup occurs in the vacuum chamber, then measurement reliability deteriorates, but frequent cleaning increases downtime
Solution Approach 1:
The system detects substances that are already present in the vacuum chamber from previous tests and extracts information about leaks from these residues, converting cleaning requirements into measurement opportunities
Solution Approach 2:
The mass spectrometer continuously monitors the vacuum chamber for substance residues, providing feedback about both leak detection and chamber contamination levels, enabling intelligent decision-making about when cleaning is actually necessary
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 reliable, repeatable, and efficient leak testing of sealed battery cells without additional gases, reducing cycle time and maintaining instrument reliability by preventing contamination.
Implementation Method 1
a vacuum pump (6) configured to create a vacuum inside the vacuum chamber (4)
Implementation Method 2
a mass spectrometer (1) configured to detect the at least one substance leaking from the battery cell when the vacuum chamber (4) is pressurized
Implementation Method 3
with heating and pressure control to prevent residue buildup and enhance detection efficiency
Data Source
AI summary
Leak testing system (100) and method for leak testing a finished battery cell, comprising a vacuum chamber (4), a vacuum pump (6), a detecting and measuring system (1) to detect gases and/or vapors escaping from the cell, the gases and/or vapors deriving from parts and/or substances inside in the cell, and a capillary element (2) which connects the detecting and measuring system to the vacuum chamber and through which the gases and/or vapors leaking from the cell flow. The system further comprises heating devices adapted to heat at least one of the components of system, thereby making the system substantially memory-free.