Pouch Battery Module Venting Risk Detection by Volume Change
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Solution Overview
Problem
Existing battery modules fail to detect gas venting in pouch-type secondary batteries at an early stage, leading to potential safety issues and performance degradation due to electrolyte leakage and external contamination.
Innovation Solution
A battery module with a volume measuring means and a control part that creates a time-volume profile to recognize the risk of gas venting by identifying the point when the volume change transitions from a stagnant state to an increasing state, using thermal imaging cameras, strain gauges, or pressure sensors, and generating a warning signal to secure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If volume measuring means and control part are added to detect gas venting, then safety and early detection capability are improved, but device complexity increases
Solution Approach 1:
The system performs preliminary detection of volume changes before gas venting actually occurs. The control part continuously monitors volume changes and identifies trends that precede gas venting events, enabling preventive action before the harmful effect manifests.
Solution Approach 2:
The system establishes a feedback loop where the volume measuring means continuously provides data to the control part, which analyzes the data and generates warning signals when gas venting is detected, creating a closed-loop monitoring system that improves safety through continuous assessment.
2Measurement precision
If continuous volume monitoring is implemented to detect gas venting early, then detection precision is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system performs periodic volume measurements at predetermined time intervals. The control part compares volume data across multiple measurement cycles to identify trends indicating gas venting, reducing energy consumption while maintaining detection precision through interval-based assessment.
3Reliability
If warning signal generation is added to alert about gas venting risks, then safety is improved, but device complexity increases
Solution Approach 1:
The warning signal generation function is extracted as a separate, dedicated component within the control part. This modular approach allows the warning function to be implemented as a distinct task or module, making the system easier to manage and maintain while improving safety through dedicated alerting capability.
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 early detection of gas venting risks, preventing sealing part gaps and improving both performance and safety by recognizing imminent gas venting before it occurs.
Implementation Method 1
a volume measuring means for observing a volume change of a battery cell, and transmitting the observed volume change as a signal
Implementation Method 2
using thermal imaging cameras, strain gauges, or pressure sensors
Implementation Method 3
using thermal imaging cameras, strain gauges, or pressure sensors
Implementation Method 4
using thermal imaging cameras, strain gauges, or pressure sensors
Data Source
AI summary
Disclosed herein provides a battery module configured to recognize the time when the volume change of a battery cell converts again from a stagnant state to an increasing state as a gas venting risk point, a battery pack, and a method for detecting a gas venting risk point. The present invention can recognize the risk of gas venting immediately before a gap is formed in a sealing part of a pouch-type battery cell, thereby having an effect of improving the safety of a battery module and a battery pack to which particularly large-capacity battery cells are applied.