Battery Cell Injection-Hole Sealing Structure for Airtight Welding
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Solution Overview
Problem
Existing battery manufacturing processes face challenges in ensuring reliable sealing of liquid injection holes, leading to potential electrolyte leakage and reduced airtightness due to small sealing areas and vulnerability to penetration during welding.
Innovation Solution
A battery cell design featuring a first sealing member welded to a first wall with exposed connection portions around the liquid injection hole, allowing for larger sealing areas and improved connection stability through penetration welding, enhancing airtightness and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is welded to seal a liquid injection hole, then the sealing function is achieved, but the sealing area is small and the connection is vulnerable to penetration
Solution Approach 1:
The patent transitions from a single-point or small-area seal to a multi-dimensional sealing structure. The sealing member extends beyond the injection hole in multiple directions (radially and axially), creating a three-dimensional sealing zone that significantly increases the effective sealing area and provides redundant sealing paths.
Solution Approach 2:
The sealing member is divided into multiple functional segments: a first sealing portion for the primary seal, a second sealing portion for additional sealing, and a connection portion for structural support. This segmentation allows each part to perform its specific function optimally while collectively providing enhanced sealing reliability.
2Reliability
If the sealing area is increased to improve airtightness, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple sealing functions into a single integrated sealing member. The first sealing portion, second sealing portion, and connection portion are all part of one component that is welded as a single unit, achieving enhanced sealing without requiring multiple separate parts or complex assembly procedures.
Solution Approach 2:
The sealing member serves multiple functions simultaneously: it provides the primary seal, provides additional sealing redundancy, ensures structural stability through the connection portion, and maintains electrical insulation. This multi-functionality reduces the need for separate components for each function.
3Strength
If penetration welding is used to connect the sealing member, then the connection strength improves, but the risk of wall penetration and electrolyte leakage increases
Solution Approach 1:
The patent incorporates a buffer zone or safety margin in the wall thickness design. The wall thickness is carefully selected to be greater than the penetration depth of the welding process, creating a cushion that prevents the welding arc from penetrating through the wall even under varying welding conditions, thus preventing electrolyte leakage.
Solution Approach 2:
The patent optimizes the wall thickness parameter to balance connection strength and leakage prevention. By adjusting the wall thickness to a specific range, the design ensures that the penetration welding achieves sufficient connection strength while the remaining material thickness prevents complete penetration and electrolyte leakage.
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 design ensures higher airtightness and reliability by providing wider connection portions and multiple sealing points, reducing the risk of electrolyte leakage and improving the overall performance of the battery cell.
Implementation Method 1
the first sealing member is welded to the first wall and forms a connection portion, the connection portion is disposed around the liquid injection hole
Data Source
AI summary
A battery cell, a battery, and an electric device. The battery cell includes a housing and a first sealing member. The housing includes a first wall, where the first wall is provided with a liquid injection hole; and the first sealing member is configured to seal the liquid injection hole, the first sealing member is welded to the first wall and forms a connection portion, the connection portion is disposed around the liquid injection hole, and the connection portion is exposed on a surface of the first sealing member facing away from the first wall.