Battery Aluminum Cover Plate With Double Sealing Against Leakage
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Solution Overview
Problem
Existing lithium ion battery aluminum cover plates face issues with leakage due to shrinkage of PFA materials and instability of sealing rings caused by small contact areas.
Innovation Solution
An improved aluminum cover plate design featuring a double sealing structure with a first sealing ring between the electrode column and cover plate, and a second sealing ring clamped between the cover plate and metal sheet, using materials like fluorine rubber for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sealing ring made of PFA material is used, then the sealing structure is simple, but the sealing reliability deteriorates due to material shrinkage over time
Solution Approach 1:
The single sealing ring is divided into two separate sealing rings: a first sealing ring (PFA material) between the electrode column cap portion and the cover plate, and a second sealing ring (fluorine rubber material) between the electrode column nail portion and the metal sheet. This segmentation allows each sealing ring to be optimized for its specific location and function, preventing the shrinkage-induced leakage problems of the single PFA sealing ring design.
Solution Approach 2:
The patent uses composite materials by combining PFA material for the first sealing ring and fluorine rubber material for the second sealing ring. Each material is selected based on its properties suitable for its specific sealing location, with fluorine rubber providing superior elasticity and sealing performance in the second sealing position where it contacts the metal sheet and cover plate.
2Force
If a pressure plate with stop frame is used to press the sealing ring, then the sealing force is concentrated, but the contact area is small causing sealing ring instability
Solution Approach 1:
The sealing function is segmented between two sealing rings at different locations. The second sealing ring is positioned between the metal sheet and cover plate with a larger contact area, distributing the sealing force more evenly and improving stability, while the first sealing ring handles the interface between the electrode column cap portion and cover plate.
Solution Approach 2:
The patent adds a second sealing ring at a different spatial dimension (between metal sheet and cover plate) in addition to the first sealing ring. This dimensional addition provides an alternative sealing path and distributes the sealing function across multiple locations, reducing the burden on any single sealing point and improving overall stability.
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 double sealing structure significantly reduces the probability of leakage, providing a more stable and reliable sealing effect compared to previous designs.
Implementation Method 1
A first sealing ring is arranged between a cap portion and a nail portion of the electrode column and the cover plate; a second sealing ring is arranged at an outer periphery of the nail portion of the electrode column, and the second sealing ring is clamped and arranged between the cover plate and the metal sheet
Data Source
AI summary
The present application discloses an improved aluminum cover plate of a battery, including a cover plate, a metal sheet and an electrode column. The electrode column penetrates and is arranged in rivet holes of the cover plate and the metal sheet, and is riveted with the metal sheet. A first sealing ring is arranged between a cap portion and a nail portion of the electrode column and the cover plate. A second sealing ring is arranged on an outer periphery of the nail portion of the electrode column, and the second sealing ring is clamped and arranged between the cover plate and the metal sheet. The first sealing ring and the second sealing ring are arranged separately.