Battery Air Electrode Bonding to Can for Volume and Sealing
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Solution Overview
Problem
Conventional metal-air electrochemical battery cells experience 'doming' of the air electrode, leading to reduced internal volume and compromised sealing, which affects energy efficiency and leakproofness.
Innovation Solution
The electrode assembly is bonded to the can in an air diffusion region using ultrasonic welding or similar methods, preventing doming and enhancing sealing by maintaining the electrode in a fixed position, thus increasing usable internal volume and improving leak resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector is tightly fitted in the can to provide good electrical contact, then electrical contact is improved, but doming of the air electrode occurs causing loss of internal volume
Solution Approach 1:
The air electrode assembly is divided into multiple segments or zones, with reinforcement elements strategically placed at critical locations (edges and center) to provide localized support where doming forces are most significant, rather than requiring uniform tight fitting throughout the entire can
Solution Approach 2:
Reinforcement elements such as rings or ribs are pre-installed on the can or current collector before assembling the air electrode, creating predetermined support structures that prevent doming from occurring in the first place, eliminating the need for post-assembly volume compensation
2Ease of manufacture
If the air electrode is allowed to dome, then manufacturing is simpler, but sealing characteristics deteriorate and leakproofness is compromised
Solution Approach 1:
The can or current collector is equipped with localized reinforcement features (such as raised rings, ribs, or protrusions) at specific locations where the air electrode requires support to maintain flatness, rather than requiring the entire structure to be complex or tightly fitted throughout
Solution Approach 2:
The air electrode assembly incorporates composite structures combining different materials with complementary properties, such as flexible electrode materials paired with rigid reinforcement elements, achieving both ease of assembly and doming prevention through material synergies
3Reliability
If internal volume is reduced to prevent doming, then sealing is improved, but energy efficiency decreases due to less active material space
Solution Approach 1:
The air electrode is segmented into functional zones with reinforcement only where structurally necessary, allowing the majority of the electrode area to maintain full thickness and active material content, thus preserving energy efficiency while achieving sealing reliability
Solution Approach 2:
The reinforcement strategy changes the local mechanical parameters (stiffness, support structure) of the air electrode assembly without altering the overall volume or thickness of the active material regions, maintaining energy density while preventing doming-induced sealing failures
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
This approach significantly increases internal volume for active materials, maintains better electrical contact, and enhances the cell's sealing characteristics, leading to improved energy efficiency and extended shelf life.
Implementation Method 1
The electrode assembly is bonded to a base of the can in an air diffusion region so as to prevent doming of the electrode assembly
Data Source
AI summary
An electrochemical battery cell is provided having a housing formed by a can and a cup, with a sealing gasket disposed therebetween. First and second electrodes and electrolyte are disposed within the housing. The first electrode is provided in an electrode assembly that is bonded to the can in an air diffusion region to prevent doming of the electrode assembly.