Electrode Assembly Tab Insulation Layout for Battery Flatness
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Solution Overview
Problem
Existing battery structures face issues with protruding adhesive paper affecting battery flatness, leading to lithium precipitation and reduced energy density due to overlapping adhesive paper at the joint positions with the electrode plate.
Innovation Solution
The electrode assembly incorporates specific depressions and insulating layers to accommodate insulating layers within these depressions, ensuring flatness and reducing thickness differences, thereby minimizing lithium precipitation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protruding adhesive paper is used to connect the tab and electrode plate, then the connection is achieved, but the battery flatness deteriorates and energy density decreases
Solution Approach 1:
The adhesive paper is extracted from the protruding state and embedded into depressions on the electrode plate surface. The tab connection structure incorporates recesses that accommodate the adhesive paper, removing the harmful protrusion while maintaining the connection function.
Solution Approach 2:
The adhesive paper is nested within the depression structures on the electrode plate. The tab groove and depression features create nested layers where the adhesive paper is contained within the electrode plate geometry, eliminating external protrusions.
2Reliability
If protruding adhesive paper is used at joint positions, then the tab connection is achieved, but lithium precipitation occurs and cycling performance deteriorates
Solution Approach 1:
The adhesive paper is extracted from the protruding position and relocated into embedded depression structures. This removes the geometric discontinuity that causes lithium precipitation while preserving the electrical connection between tab and electrode plate.
Solution Approach 2:
The electrode plate surface is modified with localized depression features at specific joint positions. These localized structural changes create smooth transitions only where needed, maintaining connection reliability while preventing lithium precipitation at critical areas.
3Reliability
If protruding adhesive paper is used for tab connection, then the connection function is achieved, but energy density decreases
Solution Approach 1:
The protruding adhesive paper is extracted and repositioned into embedded depression structures, eliminating the volume occupied by protrusions. This increases the effective energy-storing volume of the battery while maintaining connection functionality.
Solution Approach 2:
The adhesive paper transition from a protruding three-dimensional feature to an embedded feature within the electrode plate surface topology. This dimensional reconfiguration reduces the overall envelope volume required for connections, increasing energy density.
Data Source
AI summary
An electrode assembly includes a tab, a first insulating layer, and a second insulating layer. The first electrode plate includes a first current collector and first active material layers applied on two sides of the first current collector. The first active material layer is provided with a tab groove, and the tab groove is provided with a tab. At least one surface of the first active material layer is provided with a thinned region in communication with the tab groove. The thinned region includes a first depression apart from the tab groove in the first direction, and a second depression provided between the first depression and the tab groove. The first insulating layer is provided in the second depression. A projection of the second insulating layer in the first direction is located in the first depression.