Electrode Assembly Insulation Layout for Tab Short-Circuit Prevention
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring safety, particularly in reducing the risk of short circuits, which can render batteries unusable.
Innovation Solution
The proposed solution involves an electrode assembly design that includes a first electrode plate with a tab and a second electrode plate with an insulation portion. The insulation portion covers part of the second electrode plate's end portion, separating the tab from the end portion when bent, and includes a connection zone that separates the second body portion from the first tab, reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation portions are added to separate electrode plates and tabs, then safety performance is improved by reducing short circuit risk, but device complexity increases due to additional insulating structures
Solution Approach 1:
The insulation portion is merged with the electrode plate structure, where the insulation layer is integrated into the body portion of the electrode plate. This combination approach provides both structural support and electrical insulation functions through a single integrated component, reducing the need for separate insulating elements while maintaining safety performance.
Solution Approach 2:
The insulation portion acts as an intermediary element positioned between the electrode plate body and the tab connection area. This intermediary structure prevents direct contact between oppositely polarized electrodes and tabs, eliminating short circuit risks without requiring complex multi-layer insulation systems.
2Reliability
If the insulation portion covers the end portion of the second electrode plate, then short circuit risk is reduced by preventing tab contact, but manufacturing precision requirements increase
Solution Approach 1:
The insulation portion is applied selectively to specific regions of the electrode plate structure - specifically covering the end portion where the tab connects. This localized insulation approach provides precise protection against short circuits only where needed, rather than requiring insulation across the entire electrode plate surface, thereby reducing manufacturing complexity.
Solution Approach 2:
The insulation portion is pre-formed and positioned on the electrode plate body before final assembly. This preliminary preparation of the insulating structure ensures proper positioning and reduces the precision requirements during final assembly operations, as the insulation is already in place to guide subsequent manufacturing steps.
Data Source
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AI summary
This application discloses an electrode assembly, a battery cell, a battery, and an electric apparatus. The electrode assembly in the embodiments of this application includes: at least one first electrode plate which includes a first body portion and a first tab, where the first body portion has a first end portion in a first direction, and the first tab is connected to the first end portion; and at least one second electrode plate whose polarity is opposite to that of the first electrode plate, where the second electrode plate includes a second body portion and a second insulation portion connected to the second body portion, the first body portion and the second body portion are stacked in a direction perpendicular to the first direction, the second body portion has a second end portion close to the first tab in the first direction, and the second insulation portion covers at least part of the second end portion so as to separate the first tab from the second end portion when the first tab is bent. The second insulation portion can reduce risks of the first tab contacting the second end portion when the first tab is bent, improving safety performance of the electrode assembly.