Battery Cell End Cap Structure for Precise Sealing Alignment
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Solution Overview
Problem
Existing battery cell assembly processes face challenges in efficiently positioning the end cap and housing, leading to misalignment, reduced sealing performance, and safety risks due to friction and deformation during the fitting process.
Innovation Solution
The end cap features a protruding portion with a recessed portion that allows for stress relief, reducing friction and deformation, and a housing with a sidewall that limits the end cap's position, enhancing assembly efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the end cap is fitted onto the housing without a protruding portion, then the structure is simpler, but the positioning accuracy and sealing performance deteriorate
Solution Approach 1:
The end cap is divided into a cap body and a separate protruding portion that extends into the housing. This segmentation allows the protruding portion to serve as a dedicated positioning element that fits into the housing, thereby improving positioning accuracy without significantly complicating the overall structure.
Solution Approach 2:
The protruding portion acts as an intermediary element between the end cap and the housing. It mediates the connection by providing a fit feature that enhances positioning accuracy and sealing performance while maintaining relative structural simplicity.
2Strength
If the protruding portion is made with high strength, then the connection strength is improved, but the friction and deformation during assembly increase
Solution Approach 1:
A recessed portion is formed on the outer surface of the protruding portion to create a stress relief zone before the protruding portion fully engages with the housing. This beforehand cushioning allows stress to be distributed and reduced during the assembly process, minimizing friction and deformation while maintaining connection strength.
Solution Approach 2:
The recessed portion changes the stress distribution parameters of the protruding portion. By creating a localized reduction in material thickness, the stress concentration is reduced during assembly, thereby decreasing friction and deformation while preserving the overall connection strength.
3Stability of the object's composition
If the protruding portion extends deeply into the housing, then the positioning stability is improved, but the risk of housing deformation increases
Solution Approach 1:
The recessed portion on the protruding portion provides a stress relief zone that prevents excessive stress from being transmitted to the housing during assembly. This beforehand cushioning allows the protruding portion to extend deeply into the housing for stable positioning while protecting the housing from deformation.
Solution Approach 2:
The recessed portion creates a flexible zone in the protruding portion that can deform elastically during assembly. This flexibility allows the protruding portion to accommodate slight variations in housing dimensions without causing housing deformation, thereby maintaining positioning stability.
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 improves assembly efficiency by reducing misalignment and friction, while ensuring high sealing performance and safety by minimizing deformation and particle generation.
Implementation Method 1
a recessed portion or recess is formed on the end cap at a position corresponding to the protruding portion, and the recessed portion is recessed from an outer surface of the cap body toward the electrode assembly and configured to release a stress while the protruding portion extends into the housing
Data Source
AI summary
A battery cell may include: a housing, on which an opening is made; an electrode assembly, accommodated in the housing; and an end cap, configured to fit and cover the opening. The end cap may include a cap body and a protruding structure around the cap body, the protruding structure may protrude from an inner surface of the cap body toward the electrode assembly, and at least a part of the protruding portion may be located in the housing and configured to fit with the housing. A recess may be formed on the end cap at a position corresponding to the protruding structure, and the recess may be recessed from an outer surface of the cap body toward the electrode assembly and configured to release a stress while the protruding portion extends into the housing.