Lithium-Ion Cell Housing Layout for Sealing and Venting Space
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Solution Overview
Problem
Existing small lithium-ion batteries face issues with reduced capacity due to internal space occupation by side extrusion sealing, poor sealing reliability, lack of explosion-proof function, and tab protrusions occupying space.
Innovation Solution
A novel electronic device design featuring a first and second housing with a cover plate, where tabs are sandwiched between enclosure walls, and a cover plate connects to one tab while the other is sandwiched, eliminating the need for extrusion sealing and allowing for improved internal space utilization and safety features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side extrusion sealing is used, then sealing function is achieved, but internal space of battery is occupied and capacity is reduced
Solution Approach 1:
The sealing function is extracted from the side walls and transferred to the bottom plate through a dedicated sealing structure. The bottom plate includes a sealing ring that seals with the outer housing, eliminating the need for side extrusion sealing and freeing up internal battery space.
Solution Approach 2:
The housing is segmented into a bottom plate assembly and an outer housing, with the sealing function assigned to the bottom plate's sealing ring. This segmentation allows the sealing mechanism to be independent from the side walls, preventing internal space occupation.
2Reliability
If side extrusion sealing is used, then sealing is achieved, but explosion-proof function is lost and safety decreases
Solution Approach 1:
The bottom plate is segmented into a body portion and a separate sealing ring, with the sealing ring having an explosion-proof structure. This segmentation allows the explosion-proof function to be integrated into the sealing mechanism itself, maintaining both sealing and safety functions.
Solution Approach 2:
The sealing ring's explosion-proof structure converts the potential harm of internal pressure buildup into a beneficial safety feature. The explosion-proof design allows controlled pressure release, transforming a dangerous situation into a protected one while maintaining sealing integrity.
3Ease of manufacture
If tabs are drawn out from upper and lower ends of coiled cell, then electrical connection is achieved, but internal space is occupied
Solution Approach 1:
The tab arrangement transitions from a vertical dimension (upper and lower ends) to a radial/dimensional arrangement where tabs extend from the same end of the coiled cell. This dimensional change eliminates the need for vertical space occupation while maintaining electrical connection functionality.
Data Source
AI summary
Provided are an electronic device and a manufacturing method therefor. The electronic device includes a first housing, a second housing, a cover plate, and a cell. The first housing includes a bottom plate and a first enclosure wall annularly disposed on a side of the bottom plate. The second housing includes a top plate and a second enclosure wall annularly disposed on a side of the top plate. The second enclosure wall is sleeved on an outer side wall of the first enclosure wall. The top plate is provided with an exit hole. The cover plate plugs the exit hole. One of a positive tab or a negative tab of the cell is connected to a part of the cover plate facing the exit hole. The other one of the positive tab or the negative tab is sandwiched between the first enclosure wall and the second enclosure wall.