Secondary Battery Housing Weld Layout to Prevent End-Face Protrusion
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Solution Overview
Problem
The elongation of the secondary battery case in the width direction leads to protrusion of the weld on the end face, making it difficult to handle the battery effectively.
Innovation Solution
The secondary battery design positions the leading ends of the end face portions closer to the center in the width direction, allowing the end face weld to be suppressed from protruding, with the weld extending only in the height direction and being positioned closer to the center, thus preventing protrusion and reducing welding strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the case is elongated in the width direction to improve energy density, then the housing size increases, but the weld on the end face protrudes in the width direction making it difficult to handle
Solution Approach 1:
The end face portions are designed with asymmetric positioning where the leading ends are located closer to the center in the width direction than the joints connecting to side surface portions. This asymmetric configuration allows the weld to be positioned centrally rather than at the extreme edges, preventing protrusion while accommodating the elongated housing shape needed for improved energy density.
2Volume of moving object
If the case is elongated in the width direction, then the housing size increases, but welding strain on the housing increases
Solution Approach 1:
The weld is repositioned from the traditional edge location to a central position in the width direction by adjusting the end face portion geometry. This dimensional repositioning changes the weld's location from the peripheral dimension to a central position, distributing welding strain more favorably across the elongated housing structure.
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 configuration prevents the end face weld from protruding in the width direction, simplifies the handling of the battery, and reduces the welding strain on the housing, making it easier to manufacture and use.
Implementation Method 1
The end face weld connects a leading end of the first end face portion and a leading end of the second end face portion to each other
Data Source
AI summary
In a secondary battery, a first end face portion extends toward a second side surface portion, from one end of a first side surface portion in the width direction. A second end face portion extends toward a first side surface portion, from one end of the second side surface portion in the width direction. An end face weld connects respective leading ends of the first and second end face portions to each other. The leading end of the first end face portion is located closer to a center of the housing in the width direction, than a joint at which it is connected to the first side surface portion. The leading end of the second end face portion is located closer to the center of the housing in the width direction, than a joint at which it is connected to the second side surface portion.