Stacked Battery Electrode Adhesive Layout for Separator Alignment
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Solution Overview
Problem
In stacked electrode assemblies of secondary batteries, positional deviation between the separator and the positive electrode can occur on the opposite side of the positive electrode metal current collector exposed portion, affecting the battery's performance and reliability.
Innovation Solution
The secondary battery design includes a stacked electrode assembly with a positive electrode having a positive electrode metal current collector, an active material layer, and an adhesive layer that adheres to the separator. The adhesive layer is strategically positioned along the edge portions of the active material layer, including a first edge portion adjacent to the exposed portion and a second edge portion on the opposite side, to maintain proper alignment and prevent positional deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is provided on the positive electrode metal current collector exposed portion, then the positive electrode can be fixed to the separator, but positional deviation between the separator and the positive electrode may occur at the opposite side
Solution Approach 1:
The adhesive layer is divided into multiple segments: a first adhesive layer at the exposed portion and a second adhesive layer at the opposite side. This segmentation allows each adhesive layer to independently perform its function - the first adhesive layer provides fixing at the exposed portion while the second adhesive layer prevents positional deviation at the opposite side, thus resolving the contradiction between fixing reliability and positioning accuracy.
Solution Approach 2:
The second adhesive layer acts as an intermediary element at the opposite side of the electrode assembly. It mediates between the separator and the positive electrode, preventing direct contact and potential short circuits while maintaining proper positioning. This intermediary adhesive layer ensures that the separator remains properly positioned without causing positional deviation.
2Manufacturing precision
If the adhesive layer extends along both edge portions of the active material layer, then positional deviation is suppressed, but the device complexity increases
Solution Approach 1:
The adhesive layer is applied with local quality - the first adhesive layer is positioned at the exposed portion where fixing is most critical, and the second adhesive layer is positioned at the opposite side where positional deviation prevention is needed. This localized application strategy achieves high positioning accuracy without requiring adhesive coverage throughout the entire electrode structure, thereby avoiding excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses positional deviation between the separator and the positive electrode, enhancing the stability and performance of the secondary battery by ensuring consistent contact and preventing short circuits.
Implementation Method 1
an adhesive layer that adheres to the separator
Data Source
AI summary
A secondary battery of the present disclosure includes a stacked electrode assembly in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked with a separator interposed therebetween. The positive electrodes include a positive electrode metal current collector, a positive electrode active material layer stacked on the positive electrode metal current collector, and an adhesive layer adhering to the separator. A region of the positive electrode metal current collector where the positive electrode active material layer is not stacked forms a positive electrode metal current collector exposed portion. An edge portion of the positive electrode active material layer includes a first edge portion adjacent to the positive electrode metal current collector exposed portion and a second edge portion disposed on a side opposite to the first edge portion when viewed from a stacking direction in which the positive electrode and the negative electrode are stacked. The adhesive layer includes a first adhesive layer stacked on the positive electrode metal current collector exposed portion and extending along the first edge portion, and a second adhesive layer extending along the second edge portion.