Button Battery Base With Annular Cavity And Boss Electrode
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Solution Overview
Problem
Button batteries face issues with stability, anti-leakage performance, and shortened life due to relative displacement and leakage between components, as well as expansion of the cylindrical positive electrode causing diaphragm rupture.
Innovation Solution
A button battery design featuring a base with an annular cavity, a positive electrode with a boss structure and chamfered end face, and a sealing ring arrangement that reduces the space occupied by the sealing ring, allowing for increased electrolyte capacity, improved mechanical strength, and better sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cylindrical positive electrode is used, then the battery structure is simple, but the electrode expansion during usage causes separating diaphragm rupture and reduced battery life
Solution Approach 1:
The positive electrode is divided into multiple segments along its length, with each segment capable of independent expansion. This segmentation prevents uniform expansion from causing diaphragm rupture while maintaining structural simplicity
Solution Approach 2:
The positive electrode transitions from a traditional cylindrical shape to a structure with radial expansions in multiple dimensions. These expansions occur perpendicular to the electrode axis, providing accommodation space that prevents diaphragm damage
2Reliability
If the sealing ring occupies more space, then the sealing performance is improved, but the electrolyte capacity is reduced
Solution Approach 1:
The sealing ring is designed as a thin, flexible film structure that provides adequate sealing performance with minimal thickness. This reduces the space occupied by the sealing ring while maintaining reliable sealing between battery components
Solution Approach 2:
The sealing ring applies partial sealing pressure at critical locations rather than uniform pressure throughout. This concentrated sealing approach achieves reliable sealing with a thinner ring design, freeing up space for electrolyte
3Strength
If the positive electrode case and negative electrode cover are tightly packaged, then the mechanical strength is improved, but relative displacement and leakage between components occur during usage
Solution Approach 1:
The battery structure incorporates dynamic adjustment mechanisms that allow components to move slightly relative to each other during usage. This dynamic design accommodates thermal expansion and contraction while maintaining tight sealing, preventing both displacement and leakage
Solution Approach 2:
The sealing interface uses materials with different thermal expansion coefficients that change dimensions in response to temperature variations. This parameter change allows the sealing structure to adapt to thermal conditions while maintaining mechanical strength and preventing leakage
Data Source
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AI summary
The present application discloses a button battery, comprising a negative electrode cover, a positive electrode case, a sealing ring, a positive electrode, a separating diaphragm, a negative electrode and electrolyte, the sealing ring is hermetically connected with the negative electrode cover and the positive electrode case and makes the negative electrode cover and the positive electrode case form a sealing cavity, and the positive electrode, the separating diaphragm, the negative electrode and the electrolyte are arranged in the sealing cavity; the button battery further comprises a base arranged in the positive electrode case; the base comprises an outer ring wall, an inner ring wall, and a top wall, and the outer ring wall, the inner ring wall and the top wall form an annular cavity, and the top wall abuts against the sealing ring; the annular cavity is provided with a first through hole for entering and exiting of electrolyte and/or gas; the positive electrode is partially located in an inner ring of the base, and the positive electrode has a boss structure and/or an end face of the positive electrode is provided with a chamfer. By providing a base with an annular cavity and a positive electrode with a boss structure and/or a chamfered end face, etc., the button battery can increase the capacity and the discharge power of the battery, expand the operating temperature range of the battery, improve the whole stability, storage, consistency and anti-leakage performance of the battery, and extend the battery life.