Battery Lead Joint Groove Structure for Warping Suppression
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Solution Overview
Problem
Existing battery manufacturing processes face challenges in ensuring suitable joining between the current collecting bundle and the lead, particularly in regions neighboring the concave structure, leading to potential warping of the current collecting bundle.
Innovation Solution
A battery design incorporating a groove and concave structure in the joint part between the lead and current collecting bundle, with the groove depressed towards the lead side and concave portions further depressed from the groove bottom, ensuring the groove and concave structure do not protrude beyond the current collecting bundle, and using a joining apparatus with a joining jig to facilitate ultrasonic welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the current collecting bundle is joined to the lead using a joining jig with convex projections, then the joining strength is improved, but warping of the current collecting bundle occurs in regions neighboring the concave structure
Solution Approach 1:
The joining jig incorporates both convex projections and a concave portion with distinct local functions: the convex projections create concentrated contact points for strong joining, while the concave portion provides a depression zone that prevents warping in neighboring regions. This local differentiation of structural quality resolves the contradiction between achieving strong joining and preventing deformation.
Solution Approach 2:
The joining surface of the joining jig is segmented into multiple functional zones: convex projections for localized joining contact and a concave portion for warping suppression. This segmentation allows different regions to perform different functions simultaneously, achieving both strong joining and stable composition without mutual interference.
2Productivity
If ultrasonic vibration is transmitted through the joining jig to join the lead and current collecting bundle, then the joining efficiency is improved, but the concave structure formation causes warping in neighboring regions
Solution Approach 1:
The concave portion is designed in advance to counteract the warping effect that will occur during ultrasonic joining. By pre-configuring the depression structure, the system prepares a counterbalancing geometric feature that opposes the deformation tendency, allowing efficient ultrasonic joining while maintaining compositional stability.
Solution Approach 2:
The joining jig features an asymmetric surface profile with elevated convex projections and a depressed concave portion. This asymmetric geometry creates non-uniform contact during joining, where the convex areas concentrate energy for efficient bonding while the concave area provides relief from warping stresses, resolving the contradiction between joining efficiency and 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
This configuration enhances the electrical connection stability and suppresses warping of the current collecting bundle, improving the reliability and integrity of the joint, thereby enhancing the battery's performance.
Implementation Method 1
The lead and the current collecting bundle are joined by, for example, transmitting ultrasonic vibration to the joined target part through the joining jig with the joined target part interposed between the joining jig and a stage
Data Source
AI summary
A battery of an embodiment includes an electrode group, a lead, a groove, and a concave structure, and the electrode group includes a current collecting bundle protruding toward one side in a length direction. The lead is joined to the current collecting bundle with being stacked on the current collecting bundle from one side in a thickness direction of the electrode group crossing the length direction. The groove is depressed to a groove bottom toward a side on which the lead is located in the thickness direction in a joint part between the lead and the current collecting bundle. The concave structure includes one or more concave portions each further depressed from the groove bottom toward the side on which the lead is located, and the groove bottom neighbors the concave structure from a side opposite to a protruding side of the current collecting bundle in the length direction.