Electrode Plate Edge Structure for Uniform Battery Stacking
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Solution Overview
Problem
The manufacturing of rechargeable batteries with stacking type electrode plates often results in uneven thickness due to variations in the thickness of the electrode plates, which can lead to difficulties in meeting target external specifications.
Innovation Solution
The electrode plate design includes a substrate with an active material layer having multi-stage ends and a protective member attached to the boundary between the active material layer and the substrate, ensuring the protective member does not protrude beyond the active material layer, thereby maintaining uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the electrode plate is increased during manufacturing, then the capacity of the rechargeable battery may be improved, but the thickness of the rechargeable battery becomes excessively thick
Solution Approach 1:
The electrode plate is designed with variable thickness distribution: the center portion has a greater thickness to provide higher capacity, while the edge portions have a reduced thickness to prevent excessive overall battery thickness. This local differentiation of thickness allows the battery to achieve both high capacity and compact dimensions.
2Quantity of substance
If the thickness of the center and both sides of the electrode plate are differently manufactured, then the capacity distribution may be optimized, but the thickness of the electrode assembly becomes uneven, making it difficult to meet target external specifications
Solution Approach 1:
The electrode plate incorporates a protective member at the edge portions that prevents excessive thickness variation during manufacturing. This allows the center and edges to have different thickness characteristics optimized for capacity while maintaining overall thickness uniformity within acceptable tolerances for assembly.
Solution Approach 2:
The protective member is pre-installed on the electrode plate before assembly into the battery pack. This preliminary protective measure prevents thickness variations from occurring during subsequent manufacturing and assembly processes, ensuring that the electrode assembly maintains uniform thickness and meets external specifications.
3Manufacturing precision
If a protective member is added to prevent thickness variation, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The protective member is implemented as a thin film or laminated tape rather than a bulky structural component. This thin-film approach provides the necessary protection against thickness variation while adding minimal complexity to the overall device structure and maintaining a compact design.
Data Source
AI summary
An embodiment of the present disclosure provides an electrode plate including: a substrate; an active material layer on at least a portion of one surface of the substrate and having a multi-stage end portion; and a protective member on at least a portion of the multi-stage end portion of the active material layer and on the substrate such that the protective member does not protrude past the active material layer in a thickness direction.