Battery Cell End-Cover Welding Structure for Stronger Corner Seals
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Solution Overview
Problem
The welding structure between the shell and the end cover in battery cells exhibits poor strength, particularly at the corners, leading to welding defects and reduced reliability.
Innovation Solution
The battery cell design incorporates a laminated arrangement of two adjacent welding seams at the corner of the end cover, with overlapping and connected welding seams to enhance the welding strength and quality, ensuring a larger welding region and improved sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single welding seam is used to connect the end cover to the shell, then the welding process is simple, but the welding strength at the corner is poor
Solution Approach 1:
The patent applies dimensional change by transitioning from a single welding seam to multiple welding seams arranged in different spatial dimensions. Specifically, multiple welding seams are configured to overlap and connect at corner regions, creating a three-dimensional welding structure that enhances strength. This multi-dimensional arrangement allows welding material to be distributed more effectively at critical corner positions, resolving the contradiction between welding strength and structural complexity.
Solution Approach 2:
The patent merges multiple welding seams at the corner regions of the end cover, where adjacent welding seams overlap and connect to form a combined welding structure. This merging of welding seams concentrates welding material and energy at the corner positions, significantly improving welding strength and reliability. The overlapping configuration ensures that corner regions receive enhanced welding reinforcement while maintaining overall structural integrity.
2Area of stationary object
If welding seams are extended to increase coverage, then the welding region is larger, but the welding quality may deteriorate due to excessive welding material accumulation
Solution Approach 1:
The patent applies local quality by configuring welding seams with different characteristics at different locations. At corner regions, multiple welding seams overlap to provide concentrated reinforcement. In non-corner regions, single welding seams are used with controlled material deposition. This localized differentiation ensures that welding material is concentrated where needed (corners) while avoiding excessive accumulation in other areas, thereby maintaining both large welding region coverage and high welding quality.
Solution Approach 2:
The patent employs partial overlapping of welding seams specifically at corner regions rather than uniform overlapping throughout the entire welding perimeter. This partial action approach ensures that the excessive welding material accumulation is localized only to critical corner positions where additional strength is needed, while the majority of the welding region maintains controlled material deposition and high welding quality.
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus are disclosed in the present application. The battery cell includes a shell and an end cover, where the shell has an opening; the end cover is welded at the opening to form a welding structure, the welding structure includes a plurality of first welding seams, the first welding seams are arranged corresponding to edge portions of the end cover, the plurality of first welding seams are connected to form a closed annular structure to be arranged surrounding the end cover; where two adjacent first welding seams are connected at a corresponding corner of the end cover in a laminated manner.