Battery Electrode Corner Geometry for Safer Tabbed Cell Manufacturing
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Solution Overview
Problem
Current battery electrode configurations and manufacturing methods lack sufficient safety and manufacturing efficiency, particularly in achieving rounded corner designs and preventing electrode detachment.
Innovation Solution
The electrode configuration includes a current collector with active material layers and electrode tabs, featuring curved and noncurved end parts with distinct curvature radii and obtuse angles, and a manufacturing method using specialized cutting blades to form these shapes, ensuring superior safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode corner is shaped into a substantially rounded shape with convex and concave parts, then the battery design flexibility is improved, but the manufacturing complexity increases
Solution Approach 1:
The electrode corner is designed with a substantially rounded shape comprising a convexly rounded part and a concavely rounded part. This curvature design provides design flexibility for various battery shapes while the specific configuration (with the concave part having a larger curvature radius than the convex part) facilitates manageable manufacturing processes.
2Reliability
If the electrode is provided with a beveled part having an obtuse angle, then the electrode detachment prevention is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The beveled part is designed with a specific obtuse angle configuration, where the angle is defined by a tangent line at an intersection point between the curvilinear part and the outer peripheral connection part. This parameter specification (obtuse angle) enhances electrode reliability by preventing detachment while providing clear manufacturing guidelines.
3Productivity
If different curvature radii are used for the first and second curved end parts, then the manufacturing efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The electrode body features asymmetric curvature design where the first curved end part has a first curvature radius and the second curved end part has a second curvature radius that is different from the first. This asymmetry improves manufacturing efficiency by allowing optimized cutting paths and tool configurations, while the differences in curvature radii provide distinct geometric features for easier alignment and quality control.
Data Source
AI summary
An electrode for a battery includes an electrode body and an electrode tab. The electrode body includes a current collector and an active material layer provided on the current collector. The electrode tab is coupled to the current collector and extends in a first direction. The electrode body includes a first curved end part, a first noncurved end part, a second curved end part, and a second noncurved end part. The first curved end part has a convex shape and is disposed on a back side relative to the electrode tab in a second direction intersecting with the first direction. The first noncurved end part is coupled to the first curved end part and forms a first corner part at a coupling portion to the first curved end part. The first corner part has a convex shape toward the back side. The second curved end part has a convex shape and is disposed on a front side relative to the electrode tab in the second direction. The second noncurved end part is coupled to the second curved end part and forms a second corner part at a coupling portion to the second curved end part. The second corner part has a convex shape toward the front side. A curvature radius of the first curved end part and a curvature radius of the second curved end part are different from each other. An angle of the first corner part and an angle of the second corner part are each an obtuse angle.