Battery Cell Lead Structure for Resistance-Based Vent Detection
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Solution Overview
Problem
Existing battery systems struggle to accurately detect battery abnormalities, particularly in electric vehicles, leading to potential accidents due to continued operation after a vent occurs and exposure of the battery cell interior to air, which can generate gas and cause operational hazards.
Innovation Solution
A battery cell design incorporating a conductive polymer between lead electrodes and a film to detect resistance changes, coupled with a battery management system (BMS) that measures resistance and generates warning signals based on threshold values to identify and address abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery management system continuously monitors battery operation, then safety is improved, but device complexity increases
Solution Approach 1:
The battery cell performs self-diagnosis by monitoring its own internal resistance through the conductive polymer and lead electrodes, eliminating the need for complex external monitoring systems. The cell autonomously detects abnormalities and generates signals when resistance exceeds thresholds,实现ing safety monitoring through the battery's own structure
Solution Approach 2:
A conductive polymer is introduced as an intermediary material between the lead electrodes to enable resistance-based abnormality detection. The polymer's conductive properties allow it to serve as a sensing element that translates internal battery changes into measurable resistance variations, simplifying the monitoring mechanism
2Ease of manufacture
If the battery cell structure is simplified, then manufacturing ease is improved, but measurement precision of internal state deteriorates
Solution Approach 1:
The lead electrodes serve dual functions: as electrical conductors for current flow and as sensing elements for resistance-based abnormality detection. This multi-functionality eliminates the need for separate sensing components, maintaining manufacturing simplicity while enabling precise internal state measurement through the electrodes' inherent electrical properties
Solution Approach 2:
The conductive polymer acts as an intermediary that enhances the sensing capability of the existing electrode structure. By placing the polymer between the lead electrodes, the system utilizes the polymer's resistance changes to detect internal battery abnormalities, achieving precise measurement without complicating the overall cell structure
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
The system effectively detects and responds to battery abnormalities by generating inspection, warning, and evacuation signals, preventing accidents by stopping the battery system operation and alerting users to potential dangers.
Implementation Method 1
a conductive polymer including a first surface that is in contact with a first surface of the first lead electrode; and a second lead electrode including a first surface that is in contact with a second surface of the conductive polymer, in which the first lead electrode and the second lead electrode are positioned such that an increase a gap between the first lead electrode and the second lead electrode corresponds to an increase in resistance between the first lead electrode and the second lead electrode
Data Source
AI summary
A battery cell includes: an electrode assembly; a case configured to accommodate the electrode assembly; a first lead electrode electrically connected to at least one of two electrode tabs of the electrode assembly; a conductive polymer including one surface that is in contact with one surface of the first lead electrode; and a second lead electrode including one surface that is in contact with the other surface of the conductive polymer, in which when a gap between the first lead electrode and the second lead electrode increases, resistance between the first lead electrode and the second lead electrode increases.