Sealed Battery Partition Alignment Guide
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Solution Overview
Problem
Conventional sealed lead-acid batteries experience airtight sealing failures due to positional displacement of container and lid partitions during heat sealing, leading to insufficient welding at inclined portions and potential short circuits from guide ribs contacting separators.
Innovation Solution
A sealed battery design with diagonally inclined container and lid partitions, featuring a guide portion on the lid partition to align and securely join the inclined portions, preventing interference with separators and enhancing battery performance by allowing increased electrode group heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If guide ribs are provided to the horizontal portions of the lid partitions to align positions, then positioning accuracy is improved, but the risk of short circuit increases due to contact with separators
Solution Approach 1:
The guide function is extracted from the horizontal portion and relocated to the inclined portion. The guide ribs are now formed on the inclined surfaces of the lid partition rather than on horizontal surfaces, separating the positioning function from areas that could contact separators and cause short circuits.
Solution Approach 2:
The guide ribs are positioned on the inclined surfaces (adding a dimensional aspect) rather than on horizontal surfaces. This spatial relocation allows the guide ribs to perform positioning without interfering with the separators that extend vertically in the cell chamber.
2Reliability
If heat sealing is performed on inclined portions, then sealing is achieved, but welding strength is reduced due to lower pressing load
Solution Approach 1:
The guide ribs on the inclined portions perform preliminary positioning of the container partition relative to the lid partition before the heat sealing process begins. This ensures that the inclined surfaces are properly aligned and positioned, allowing the heat sealing to proceed effectively despite the reduced pressing load on inclined surfaces.
3Quantity of substance
If electrode group height is increased to enhance battery capacity, then energy storage is improved, but the risk of short circuit increases due to separator contact with guide ribs
Solution Approach 1:
The guide function is extracted from areas that could contact separators (horizontal portions) and relocated to the inclined portions, allowing electrode groups to be increased in height without the risk of guide ribs contacting separators and causing short circuits.
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 solution ensures reliable joining of container and lid partitions, prevents short circuits, and increases battery performance by allowing higher electrode group heights without compromising sealing integrity.
Implementation Method 1
a lid having lid partitions welded to the container partitions by heat sealing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A sealed battery includes a container 2, which is partitioned into a plurality of cell chambers 2S with container partitions 21, and a lid 4 having lid partitions 41 to be welded to the container partitions 21 by heat sealing. Each of the container partitions 21 includes a container-inclined portion 5x formed at a higher position than upper ends of container side walls 2a to 2d, each of the lid partitions 41 includes a lid-inclined portion 6x formed to conform to the container-inclined portion 5x, and a guide portion 7 for aligning a position of the container-inclined portion 5x with the lid-inclined portion 6x is provided to the lid-inclined portion 6x.