Electrode Plate Pressed Portions Adhesion
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Solution Overview
Problem
Existing electrode plates in secondary batteries lack effective methods to enhance adhesion between active material coated and uncoated portions, leading to reduced capacity density and performance.
Innovation Solution
The formation of pressed portions on the boundary surface between active material coated and uncoated portions of the electrode current collector using a stepped part pressing jig, creating creases that increase adhesion and improve manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rolling is applied to increase adhesion between active material and current collector, then adhesion is improved, but the boundary surface between coated and uncoated portions becomes irregular and difficult to distinguish
Solution Approach 1:
The pressing operation is segmented into two distinct stages: first pressing the active material coated portion to enhance adhesion, then pressing the uncoated portion to form a regular boundary surface. This segmentation allows each pressing stage to serve its specific function without compromising the other, resolving the contradiction between adhesion improvement and boundary regularity.
Solution Approach 2:
The active material coated portion is pressed in advance before the uncoated portion is pressed. This preliminary action ensures that adhesion is enhanced first, and then the boundary surface is regularized in a subsequent step, preventing the boundary from becoming irregular during the adhesion-enhancing pressing process.
2Ease of manufacture
If the electrode plate structure is simplified without pressed portions, then manufacturing complexity is reduced, but adhesion between active material and current collector deteriorates
Solution Approach 1:
The pressing process is divided into two sequential steps with distinct objectives: first pressing the active material coated portion to enhance adhesion, then pressing the uncoated portion to form a regular boundary. This segmentation achieves both adhesion improvement and boundary regularization without requiring complex additional equipment or processes.
Solution Approach 2:
The pressing parameters (pressure, duration, jig configuration) are optimized to achieve both adhesion enhancement and boundary regularization simultaneously. By carefully controlling the pressing parameters, the process achieves multiple objectives without increasing manufacturing complexity.
3Shape
If multiple pressing operations are performed to regularize the boundary surface, then boundary regularity is improved, but manufacturing time and process complexity increase
Solution Approach 1:
The adhesion enhancement pressing and boundary regularization pressing are merged into a single continuous operation using a stepped part pressing jig. The jig simultaneously presses both the active material coated portion and the uncoated portion in sequence, achieving both objectives in one manufacturing step rather than requiring separate operations.
Solution Approach 2:
The stepped part pressing jig serves multiple functions: it enhances adhesion of the active material coated portion, regularizes the boundary surface, and provides clear visual distinction between coated and uncoated areas. This multi-functionality eliminates the need for multiple separate pressing operations, reducing manufacturing time and process complexity.
Data Source
AI summary
An electrode plate of a secondary battery includes an electrode current collector, an active material coated portion on at least one surface of the electrode current collector, and an uncoated portion on the electrode current collector, the uncoated portion including pressed portions extending from a boundary of the active material coated portion and the uncoated portion to a distance on the uncoated portion in a widthwise direction of the electrode current collector.