Battery Cell Gas Analysis for Non-Destructive Formation Quality Control
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Solution Overview
Problem
Current quality control systems for battery cells are time-intensive and costly, with limited diagnostic capabilities, and often require destroying the cell to analyze the Solid Electrolyte Interphase (SEI), which is not prognostic and inefficient.
Innovation Solution
A quality control system that analyzes the gas formed during the cell formation process using a computational system with sensors to measure pressure, temperature, and composition, determining a volume and composition threshold to assess a quality score for the battery cell without destroying it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current quality control methods (discharge capacity check, OCV monitoring) are used to analyze battery cell quality, then quality assessment can be achieved, but the process is time-intensive and requires inventory holding
Solution Approach 1:
The patent extracts and analyzes the gas produced during cell formation as a separate indicator of quality. By taking out the gas analysis from the traditional time-intensive methods, the system achieves quality assessment without requiring lengthy inventory holds or discharge capacity checks, directly resolving the time-loss contradiction
Solution Approach 2:
The system performs gas analysis during the cell formation process itself, before the cell enters inventory. This preliminary quality indication allows manufacturers to identify defective cells early, eliminating the need for subsequent time-intensive quality verification and inventory holding
2Loss of information
If SEI analysis is performed to assess battery cell quality, then diagnostic information can be obtained, but the battery cell must be cut open destroying it
Solution Approach 1:
The patent uses gas composition as an intermediary indicator that reflects SEI formation quality without requiring direct SEI analysis. The gas serves as a mediator that carries information about the electrochemical processes, allowing quality assessment while keeping the cell intact and avoiding destruction
Solution Approach 2:
The patent replaces the mechanical destruction method (cutting open the cell) with a chemical sensing method (gas analysis). This substitution eliminates the need for physical damage to the cell while still providing diagnostic information about SEI formation quality
3Measurement precision
If traditional quality control methods are used, then quality assessment is achieved, but the data obtained is data-poor and not prognostic
Solution Approach 1:
The patent changes the measurement parameter from electrical properties (capacity, voltage) to chemical properties (gas composition). This parameter change provides richer diagnostic information about the electrochemical processes during formation, enabling both quality assessment and prognostic capabilities that traditional methods lack
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 method reduces the need for lengthy inventory holds and open circuit voltage monitoring, providing diagnostic and prognostic data on battery cell quality through non-destructive analysis, improving manufacturing throughput and reducing costs.
Implementation Method 1
a gas detection sensor configured to measure the composition of the gas within the gas pouch
Implementation Method 2
a pressure sensor configured to measure the pressure of the gas in the manifold
Implementation Method 3
a temperature sensor configured to measure the temperature of the gas in the manifold
Data Source
AI summary
A quality control system analyzes the quality of a battery cell, with the battery cell defining a gas pouch configured to be filled with a gas. The quality control system includes a computational system including a processor and a memory, a manifold defining a passageway extending between an inlet port for receiving the gas and an outlet port, and at least one sensor in electronic communication with the computational system. The sensor is arranged to measure a physical property of the gas and transmit a signal to the computational system corresponding to the physical property of the gas. The computational system analyzes the physical property of the gas, accesses a threshold value corresponding to the physical property, compares the physical property to the threshold value, and assess a quality score for the battery cell. A corresponding method analyzes the quality of the battery cell with the quality control system.