Battery Module Electrolyte Impregnation Detection by Load Distribution
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Solution Overview
Problem
Existing methods for producing bipolar electricity storage apparatuses fail to detect sufficient impregnation of an electrolytic solution into electrodes, leading to potential battery failures.
Innovation Solution
A method of producing a battery module that determines the impregnation state of an electrolytic solution by measuring the relative relationship between loads at multiple positions within the battery module using a detector system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If depressurization method is used to accelerate electrolytic solution impregnation, then impregnation speed is improved, but impregnation state detection capability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism by measuring load changes at multiple positions within the battery module and using these measurements to determine the impregnation state. The load sensor detects weight changes as the electrolytic solution is absorbed by the electrode, providing real-time feedback on impregnation progress. This allows the system to monitor and control the impregnation process accurately while maintaining high speed through depressurization.
2Ease of manufacture
If impregnation detection is not implemented, then production process simplicity is maintained, but battery reliability deteriorates
Solution Approach 1:
The patent employs a self-service approach where the battery module itself provides the detection function through its structural components. The load sensor, which is part of the battery module structure, automatically measures the impregnation state without requiring external detection equipment. This integrates the detection function into the manufacturing process, maintaining simplicity while ensuring reliability through automated monitoring.
3Measurement precision
If multiple load measurement positions are used to determine impregnation state, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the detection function into multiple segments by placing load sensors at different positions within the battery module. Each sensor measures local load changes, and the combination of these segmented measurements provides comprehensive information about the overall impregnation state. This segmentation approach improves measurement accuracy while keeping each individual sensor simple.
Data Source
AI summary
A method of producing a battery module according to the present disclosure is a method of producing a battery module including an internal space, and an electrode stack housed in the internal space. The method includes starting injection of an electrolytic solution into the internal space, and determining an impregnation state of the electrolytic solution into the electrode stack based on a relative relationship between loads at a plurality of positions spaced apart from each other in the battery module. This configuration makes it possible to provide the method of producing the battery module that can determine the impregnation state of the electrolytic solution into the electrode.