Electrode Assembly Fixation Frame for Separator Shift Control
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Solution Overview
Problem
Existing electrode assemblies in secondary batteries, particularly those with stacked or stacked and folded type structures, face issues of electrode and separator movement or deformation, leading to potential short circuits and increased defect rates due to irregular adhesive tape attachment.
Innovation Solution
An external shape fixation frame is applied to the outer surface of the electrode assembly, specifically designed to wrap and stabilize the electrode assembly, preventing movement and deformation of electrodes and separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive tape is added to fix the electrode assembly, then movement and deformation are prevented, but manufacturing complexity and defect rates increase due to irregular attachment
Solution Approach 1:
The patent replaces complex adhesive tape attachment systems with a simple, disposable fixation frame made of inexpensive material. The frame is a single-use component that provides stable fixation without requiring complex attachment mechanisms or precise positioning systems, thereby reducing manufacturing complexity while maintaining electrode assembly stability.
Solution Approach 2:
The fixation frame is designed as a thin, flexible structure that can conform to the electrode assembly shape. This thin-film approach provides effective stabilization while adding minimal complexity to the overall device structure, avoiding the need for bulky or rigid fixation mechanisms.
2Reliability
If adhesive tape is used for fixation, then electrode movement is reduced, but production process complexity increases
Solution Approach 1:
The fixation frame serves as a simple, disposable component that ensures reliable electrode positioning without requiring complex production processes. Its straightforward design allows for easy manufacturing and integration, improving ease of manufacture while maintaining positioning reliability.
Solution Approach 2:
The fixation frame is designed as a segmented or modular structure that can be easily assembled and attached to the electrode assembly. This segmentation simplifies the manufacturing process by breaking down the fixation function into manageable parts, making production easier while ensuring reliable electrode positioning.
3Volume of moving object
If stacked type electrode assembly is used, then space utilization improves, but separator rolling and short circuit risk increase under external impact
Solution Approach 1:
The fixation frame acts as a protective element that cushions the electrode assembly against external impacts before damage can occur. By providing pre-installed mechanical support and constraint, the frame prevents separator rolling and electrode displacement under impact conditions, reducing short circuit risk while maintaining the space-efficient stacked design.
Solution Approach 2:
The thin-film fixation frame provides protective coverage over the electrode assembly, creating a flexible shield that prevents external impacts from causing internal damage. This thin protection layer maintains the compact stacked structure while mitigating impact-induced harmful effects.
Data Source
AI summary
The present invention relates to an electrode assembly having an external shape fixation frame, and more particularly an electrode assembly including a unit cell including one or more electrodes and one or more separators, wherein the electrode assembly is (1) a stacked type electrode assembly, (2) a stacked and folded type electrode assembly, or (3) a wound type electrode assembly, and the electrode assembly includes an external shape fixation frame configured to wrap a portion of an outer surface of the electrode assembly, and a lithium secondary battery including the same.