Pouch Battery Electrode Tap Rupture Structure for Swelling Current Cutoff
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Solution Overview
Problem
Pouch type secondary batteries are prone to swelling due to internal pressure increases from temperature rises, posing risks of ignition or explosion due to continuous current flow.
Innovation Solution
A pouch type secondary battery design featuring a rupture portion connecting area with linear grooves and rupture lines on the electrode tap that concentrate stress to accurately rupture and interrupt current flow when swelling occurs, using triangular grooves to ensure smooth separation of weld areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrode tap structure is made robust to ensure reliable electrical connection, then connection strength is improved, but the ability to rupture and interrupt current during swelling is worsened
Solution Approach 1:
The electrode tap is segmented into a connection part and a rupture portion connecting area. The rupture portion connecting area includes rupture lines that can separate under stress, creating a mechanical weak point that allows current interruption while maintaining connection strength in normal operation.
Solution Approach 2:
Rupture lines are pre-formed in the rupture portion connecting area before the battery experiences swelling. These pre-formed lines create predetermined stress concentration points that will rupture first under thermal stress, ensuring reliable current interruption before dangerous pressure buildup occurs.
2Manufacturing precision
If the rupture portion is designed with complex groove structures to ensure accurate rupture, then manufacturing precision is improved, but device complexity worsens
Solution Approach 1:
The rupture portion connecting area has different structural properties than the rest of the electrode tap. It includes specific groove structures (first and second grooves) that create stress concentration points, while other parts of the electrode tap maintain uniform structure for strong electrical connection. This localized structural differentiation enables precise rupture control without complicating the entire device.
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 effectively prevents continuous current flow and potential hazards by ensuring precise rupture and disconnection of electrode connections, mitigating risks of ignition or explosion.
Implementation Method 1
a rupture portion connecting area (120) which connects the second weld area (F2) and the electrode connection part (112), and which is configured to rupture and separate the second weld area (F2) from the electrode connection part (112) when a predetermined amount of stress occurs
Data Source
AI summary
Discussed is a pouch type secondary battery including an electrode assembly in which one or more positive electrode plates and negative electrode plates are stacked, an electrode tap that extends from the electrode assembly, an electrode lead bondingly connected to the electrode tap, and a pouch exterior that surrounds and seals the electrode assembly such that a portion of the electrode lead is exposed. The electrode lead includes a first weld area electrically coupled to the electrode tap. The electrode tap includes a second weld area electrically coupled to the first weld area, an electrode connection part distinguished from the second weld area by a rupture portion connecting area, and electrically connected to the electrode assembly. The rupture portion connecting area connects the second weld area and the electrode connection part, and is ruptured when stress occurs and separates the second weld area from the electrode connection part.