Cylindrical Battery Pole Sealing Structure for Controlled Welding
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Solution Overview
Problem
Conventional large cylindrical batteries face challenges in welding between the pole and connecting piece due to limited welding space and difficulty in controlling welding energy, resulting in suboptimal sealing performance.
Innovation Solution
The cylindrical battery design includes a case with a through hole, a pole with a second through hole, a connecting piece with a protrusion that extends into the second through hole, and a sealing nail that hermetically fixes within the second through hole, ensuring secure connection and sealing. Optional features include a straight through portion and concave portions for the sealing nail, and a protrusion that is welded or riveted to the inner wall, facilitating controlled welding and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional welding methods are used for connecting the pole and connecting piece, then the welding process is simple, but the welding quality is poor due to limited welding space and difficulty in controlling welding energy
Solution Approach 1:
The connecting piece is divided into a first connecting piece and a second connecting piece that are separately welded to the pole. This segmentation allows each welding operation to be performed in a more accessible position, improving welding quality while maintaining a relatively simple overall structure.
Solution Approach 2:
The connecting piece acts as an intermediary component between the pole and the battery core tabs. By introducing this intermediate element, the welding process can be optimized independently, allowing for better welding quality without directly complicating the pole-battery core connection.
2Reliability
If the pole directly contacts the battery core tabs, then the structure is simple, but the sealing performance is poor
Solution Approach 1:
The connecting piece serves as a mediator between the pole and the battery core tabs, providing both electrical connection and sealing function. This intermediary component enables reliable sealing without requiring direct contact between the pole and tabs, thus improving reliability while adding minimal structural complexity.
Solution Approach 2:
The connecting piece appears to be designed as a composite structure that combines conductive material (for electrical connection) with sealing material (for sealing performance). This composite approach allows simultaneous achievement of good electrical contact and sealing, resolving the contradiction between simplicity and performance.
3Volume of stationary object
If welding space is limited, then the battery structure is compact, but the welding energy control becomes difficult
Solution Approach 1:
By segmenting the connecting piece into first and second connecting pieces, the welding operations can be performed at different locations with better accessibility. This maintains the compact battery volume while improving welding energy control through enhanced access to welding zones.
Solution Approach 2:
The connecting piece extends in multiple dimensions, creating welding surfaces that are more accessible from different angles. This dimensional arrangement allows for better welding energy control without increasing the overall battery volume, as the welding access is improved through spatial arrangement rather than size increase.
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 design enhances the welding effect and sealing performance between the pole and connecting piece, ensuring high safety and reliability of the cylindrical battery, particularly by allowing for controlled energy application during welding and maintaining insulation and sealing integrity.
Implementation Method 1
the protrusion is fixedly connected to the inner wall of the second through hole
Implementation Method 2
a sealing nail hermetically fixed in the second through hole
Implementation Method 3
the cover portion is welded and fixed to the bottom surface of the first concave portion
Data Source
AI summary
The disclosure discloses a cylindrical battery and an electronic device. The cylindrical battery includes a case, a pole, a connecting piece, and a sealing nail. The case includes a cylindrical side wall and an end wall connected to the side wall, and a first through hole is disposed on the end wall. The pole includes a second through hole and passes through the first through hole. The connecting piece is disposed in the case and includes a protrusion, the protrusion extends into the second through hole, and the protrusion is fixedly connected to the inner wall of the second through hole.