Electrode Tab Geometry for Stable High-Speed Battery Cutting
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Solution Overview
Problem
The existing tab structure in lithium-ion battery cells is prone to deformation and damage during cutting, leading to inconsistent overcurrent capability and reduced charging and discharging efficiency, especially at high speeds, due to limitations in cutting stability and tab tearing.
Innovation Solution
The electrode plate design features a tab with a first and second arc section connected by a sharp corner, positioned at the middle region of the tab edge, ensuring cutting stability and integrity during high-speed cutting processes, allowing for maximum current passage and improved charging and discharging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting end point is positioned at the end region of the tab edge, then the cutting process can be completed, but tab tearing and folding occur easily, affecting tab integrity
Solution Approach 1:
The patent applies preliminary action by positioning the cutting end point at a middle region of the tab edge rather than the end region, and by designing arc sections with specific curvature radii (R1≥3mm, R2≥3mm) in advance. This pre-planned cutting path configuration prevents tab tearing and folding before they can occur during high-speed cutting, thereby maintaining tab integrity while enabling higher cutting speeds.
2Productivity
If high-speed cutting is performed (over 100m/min), then productivity increases, but the laser track cannot match the running speed, causing cutting limitation
Solution Approach 1:
The patent applies dynamics by designing the third edge with arc sections that have specific curvature radii (R1≥3mm, R2≥3mm). These curved paths allow the laser track to dynamically adapt to high-speed movement, enabling smooth transitions that match the apparatus running speed over 100m/min. The arc geometry ensures the laser can maintain accurate tracking at high speeds, preventing cutting limitations while preserving cutting stability and tab integrity.
3Reliability
If the tab cross-section is increased to allow larger current, then the overcurrent capability improves, but the tab size and structure complexity increase
Solution Approach 1:
The patent applies local quality by optimizing the tab geometry with specific arc sections (R1≥3mm, R2≥3mm) at critical regions. This localized geometric optimization allows the tab to maintain structural integrity and resist tearing during cutting while preserving the necessary cross-sectional area for high current capacity. The arc design concentrates structural reinforcement where needed (at the edges and cutting regions) rather than uniformly increasing the entire tab size, thus improving overcurrent capability without excessive structure complexity.
Data Source
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AI summary
The present disclosure discloses an electrode plate, a battery, an electric apparatus, and a method of preparing the electrode plate. The electrode plate includes an electrode plate body and a tab located at least one end of the electrode plate body in a width direction of the electrode plate body. The tab has a first edge, a second edge, and a third edge that are connected in sequence. An end of the first edge away from the second edge is connected to the electrode plate body. An end of the third edge away from the second edge is connected to the electrode plate body. The third edge has a first arc section and a second arc section. A connection position between the first arc section and the second arc section has a sharp corner.