Electrolyte Injection O-Ring for Cylindrical Battery Beading Sealing
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Solution Overview
Problem
The existing electrolyte injection systems for cylindrical batteries often result in electrolyte remaining in the stepped portion of the beading portion, leading to potential leakage and corrosion during the cap assembly crimping and sizing processes.
Innovation Solution
An electrolyte injection O-ring with a diameter-enlarged portion that elastically deforms when pressed, allowing it to closely contact the beading portion and prevent electrolyte from accumulating in the stepped portion, thereby ensuring complete injection and minimizing leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrolyte is injected into the cylindrical can, then the electrode assembly is saturated with electrolyte, but electrolyte remains in the stepped portion of the beading portion causing potential leakage and corrosion
Solution Approach 1:
The invention extracts and removes the harmful element (electrolyte) from the problematic location (stepped portion of beading portion) by using the O-ring to block and redirect the electrolyte flow, ensuring electrolyte is taken out from the stepped portion and redirected to the electrode assembly where it is needed
Solution Approach 2:
The O-ring acts as an intermediary element between the electrolyte injection system and the beading portion, mediating the electrolyte flow by blocking the stepped portion while allowing proper saturation of the electrode assembly, thus preventing direct contact between electrolyte and the stepped portion
2Reliability
If the O-ring is pressed to contact the beading portion, then electrolyte accumulation is prevented, but the O-ring material must withstand compression forces
Solution Approach 1:
The invention changes the material parameters of the O-ring by selecting materials with specific compression resistance properties and optimal elasticity, allowing the O-ring to withstand compression forces during installation while maintaining its sealing function and preventing electrolyte accumulation
Solution Approach 2:
The invention uses composite material properties by combining materials with different characteristics (fluororubber, vinylidene fluoride-containing rubber, or acrylonitrile-containing rubber) to achieve both the necessary compression resistance and elasticity for reliable electrolyte accumulation prevention
3Stability of the object's composition
If a stepped portion is formed to ensure stable cap assembly mounting, then the cap assembly is properly positioned, but electrolyte scatters and accumulates in the stepped portion
Solution Approach 1:
The invention extracts the harmful electrolyte accumulation from the stepped portion by using the O-ring to block the stepped area, allowing the stepped portion to maintain its structural function for cap assembly stability while removing the harmful electrolyte presence from that location
Solution Approach 2:
The invention applies local quality by placing the O-ring specifically at the stepped portion to create a localized barrier that prevents electrolyte accumulation in that specific area, while leaving the rest of the system (cap assembly mounting) unchanged and functional
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 proposed solution effectively prevents electrolyte from remaining on the beading portion after injection, reducing the risk of external leakage and corrosion, and ensuring the integrity of the cylindrical battery.
Implementation Method 1
a diameter-enlarged portion extending from a lower portion of the body portion along a centrifugal direction and a central axis direction... configured to deform elastically when pressure is applied along the central axis such that a diameter of the outer circumferential surface increases in the centrifugal direction
Implementation Method 2
When an electrolyte E is injected from an electrolyte injector 30, the electrolyte E falls towards the electrode assembly JR by gravity and gradually permeates into the electrode assembly JR
Implementation Method 3
the electrolyte E falls towards the electrode assembly JR by gravity and gradually permeates into the electrode assembly JR
Data Source
AI summary
An electrolyte injection O-ring and a cylindrical battery manufacturing method using the same are provided. The electrolyte injection O-ring includes a body portion having an open top end and an open bottom end and defining a cavity along a central axis; and a diameter-enlarged portion extending from a lower portion of the body portion along a centrifugal direction and the central axis direction. The diameter-enlarged portion includes an outer circumferential surface surrounding the central axis. The diameter-enlarged portion deforms elastically when pressure is applied in the axial direction, so that a diameter of the outer circumferential surface increases in the centrifugal direction.