Pouch Battery Exhaust Part with Variable Adhesion
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Solution Overview
Problem
Pouch type secondary batteries face safety risks due to swelling and potential explosion or ignition from high pressure generated during overheating, as existing technologies do not adequately address the release of internal pressure and materials during overcharging or internal shorts.
Innovation Solution
Incorporating an exhaust part with an exhaust member inserted into the bonding surface of the sealing part, having adhesion weaker than the sealing part, to release pressure and discharge materials externally when the battery swells, thereby preventing explosion or ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing part is made with strong adhesion to ensure battery integrity, then the battery remains sealed under normal conditions, but the battery cannot release pressure during overheating leading to explosion or ignition risks
Solution Approach 1:
The sealing part is divided into two functional regions: a first bonding region with strong adhesion for maintaining sealing integrity, and a second bonding region with weaker adhesion for pressure release. This segmentation allows the sealing part to simultaneously provide both reliable sealing under normal conditions and safe pressure venting during overheating.
Solution Approach 2:
Different bonding strengths are applied to different local regions of the sealing part. The first bonding region uses a sealing member with adhesion force of 50-150 gforce to ensure strong sealing, while the second bonding region has adhesion force of 10-30 gforce to enable controlled pressure release, creating local quality variations that resolve the contradiction.
2Ease of manufacture
If the sealing member has uniform adhesion strength across the entire bonding surface, then manufacturing is simplified, but the battery cannot selectively release pressure during swelling conditions
Solution Approach 1:
The bonding surface is segmented into regions with different adhesion strengths. The first bonding region uses sealing members with adhesion force of 50-150 gforce while the second bonding region uses sealing members with adhesion force of 10-30 gforce. This segmentation enables selective pressure release functionality while maintaining a relatively simple manufacturing process by using different sealing members in different regions.
Solution Approach 2:
Different adhesion qualities are applied to different local regions of the sealing part. The first bonding region has strong adhesion (50-150 gforce) for permanent sealing, while the second bonding region has weaker adhesion (10-30 gforce) for controlled pressure release, creating local quality variations that enable adaptability without significantly complicating manufacturing.
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 solution effectively reduces the risk of explosion and ignition by releasing pressure and materials externally, enhancing the safety of pouch type secondary batteries during overheating conditions.
Implementation Method 1
an exhaust part including an exhaust member inserted into a predetermined region of a bonding surface of the sealing part and formed to have adhesion weaker than that of the sealing part
Implementation Method 2
when the pouch type secondary battery is swollen due to high pressure generated within the secondary battery under the conditions of overheating such as overcharging, internal short
Data Source
AI summary
Provided is a pouch type secondary battery. In more detail, a pouch type secondary battery includes an electrode assembly, a pouch type battery case, a sealing part, and an exhaust part, wherein the exhaust part is formed to have adhesion weaker than that of the sealing part to release the sealing of the exhaust part when the pouch type secondary battery is swollen due to high pressure generated within the secondary battery under the conditions of overheating such as overcharging, internal short, and the like, thereby discharging materials in the pouch type secondary battery to the outside so as to secure safety of the pouch type secondary battery.