Lithium Battery Wrapped Electrode Structure for Hermetic Sealing
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Solution Overview
Problem
The existing lithium battery electrode structures that penetrate the lid body are prone to hermetic failures due to aging of insulating materials, deformation under vibration, increased resistance, and high manufacturing costs, leading to reduced battery lifespan and efficiency.
Innovation Solution
A conductive electrode structure is formed by wrapping the electrode body around the lid body, using sheet metal with bent portions for indirect penetration, reducing the risk of water vapor ingress and enhancing contact area for improved charge/discharge efficiency, and incorporating a fixing element for secure connections without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrode structure penetrates the lid body directly using rigid materials, then the electrical connection is simple and direct, but the through hole becomes damaged and deformed due to relative stress in high vibration environments, compromising hermeticity
Solution Approach 1:
The patent replaces rigid penetrating electrodes with flexible sheet metal electrodes that wrap around the lid body. The sheet metal material can deform elastically under vibration stress without causing through hole damage, maintaining hermeticity while ensuring electrical connection. The wrapping structure distributes stress along the wrap path rather than concentrating it at a single penetration point.
Solution Approach 2:
Instead of penetrating the lid body from outside to inside, the patent inverts the approach by wrapping the electrode from the inside out, with the sheet metal electrode wrapping around the lid body and emerging at the top surface. This inversion eliminates the need for through holes while achieving both electrical connection and hermetic sealing.
2Reliability
If insulating strips are used to achieve hermetic effect at penetrating positions, then sealing is initially effective, but the insulating strip generates gaps due to aging after long time use, allowing water vapor entry
Solution Approach 1:
The patent removes the insulating strip component entirely from the design. By eliminating the penetrating through hole structure, there is no need for insulating strips to provide hermetic sealing. The sheet metal electrode wrapping structure maintains hermeticity through its continuous wrap configuration without relying on separate sealing components that would degrade over time.
Solution Approach 2:
The patent uses sheet metal material that combines both electrical conductivity and hermetic sealing properties in a single component. The sheet metal forms both the electrical connection path and the hermetic barrier, eliminating the need for separate insulating strip components that would be subject to aging and gap formation.
3Device complexity
If rivets or bolts are used as external electrodes for penetrating connections, then the structure is simple, but the small sectional area causes thermal energy accumulation and increased impedance during charging
Solution Approach 1:
The patent transitions from a point-contact electrode (rivet or bolt penetrating through a small hole) to a surface-area electrode (sheet metal wrapping around the lid). This dimensional change from 0D point contact to 2D surface contact dramatically increases the effective contact area, reducing current density and associated thermal energy accumulation and impedance losses.
Solution Approach 2:
The patent merges the electrical connection function and the hermetic sealing function into a single sheet metal electrode component. The wrapping structure provides both the electrical pathway and the hermetic barrier, eliminating the need for separate rivets, bolts, and insulating strips, thereby simplifying the overall structure while improving electrical performance through increased contact area.
4Strength
If multiple rigid electrical connecting elements are used to connect lithium batteries in series or parallel, then the electrical connection is stable, but the through hole is damaged and deformed due to relative stress, reducing battery lifespan
Solution Approach 1:
The patent employs flexible sheet metal electrodes that can accommodate vibration and stress through elastic deformation rather than rigid fracture. When multiple batteries are connected, the flexible wrapping structure absorbs relative movements and stresses without damaging the through holes or compromising hermeticity, maintaining both electrical connection stability and sealing integrity under stress conditions.
Data Source
AI summary
An electrode structure of a lithium battery is provided for electrically connecting a positive pole and a negative pole in a tank of the lithium battery to the external. The electrode structure includes a lid body and at least one electrode body made of sheet metal material. The electrode body has a wrapped portion disposed in the lid body, two ends of the wrapped portion form bent portions respectively, and a connection portion and an output portion extend respectively from the bent portions to protrude from a surface of the lid body. A conductive electrode structure of the lithium battery is formed by wrapping instead of direct penetrating, thus achieving a hermetic effect of conductive positions of the electrode.