Pouch Battery Circuit Layout for Early Ventilation Detection
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Solution Overview
Problem
Lithium secondary batteries face issues with operational reliability and stability due to fluorine reactions generating fluoric acid, which causes solvent decomposition and electrode corrosion, leading to increased internal pressure and potential defects from existing fluoric acid sensing agents.
Innovation Solution
A lithium secondary battery design featuring a first and second pouch case with conductive units that form an electric circuit along the peripheral portions, allowing for early detection of ventilation through changes in the electric circuit, thereby preventing excessive gas generation and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transparent identification unit is added to the pouch for visual observation of the fluoric acid sensing agent, then the sensing capability is improved, but the mechanical properties of the pouch are degraded
Solution Approach 1:
The patent replaces the mechanical transparent identification unit with an electrical detection system. Conductive patterns are formed on the pouch surface to create an electric circuit that detects ventilation through electrical property changes, eliminating the need for transparent windows and preserving pouch mechanical integrity while achieving sensing functionality
Solution Approach 2:
The patent introduces conductive patterns as an intermediary element between the pouch structure and the sensing function. These patterns serve dual purposes: maintaining pouch structural integrity while enabling electrical detection of ventilation through changes in electrical properties caused by gas generation
2Reliability
If the pouch is sealed to ensure battery integrity, then the protective function is improved, but the ability to detect ventilation early is reduced
Solution Approach 1:
The patent implements a feedback mechanism where conductive patterns on the sealed pouch surface detect ventilation through changes in electrical properties. When gas is generated inside the sealed pouch, it causes swelling that alters the electrical characteristics of the conductive patterns, providing real-time feedback on pouch integrity without compromising the seal
Solution Approach 2:
The patent replaces mechanical ventilation detection methods with electrical detection. Instead of using transparent windows or mechanical sensors that would compromise the seal, conductive patterns detect internal pressure changes and gas generation through electrical property changes, maintaining both seal integrity and detection 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
The design enables early detection of ventilation and prevents excessive gas generation, improving operational reliability and stability by ensuring timely intervention and maintaining mechanical integrity.
Implementation Method 1
The first conductive unit and the second conductive unit may be in contact with each other to form one electric circuit
Data Source
AI summary
A lithium secondary battery according to embodiments of the disclosed technology includes a pouch that includes a first pouch case including a first peripheral portion and a first conductive unit formed at the first peripheral portion, and a second pouch case including a second peripheral portion and a second conductive unit formed at the second peripheral portion, the second pouch case being sealed with the first pouch case, and an electrode assembly accommodated in the pouch. The first conductive unit and the second conductive unit are in contact with each other to form an electric circuit along the first peripheral portion or the second peripheral portion.