Secondary Battery Electrode Assembly for Outer Plate Deformation Control
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Solution Overview
Problem
Secondary batteries face challenges in enhancing safety and test reliability due to deformation of the outer electrode plate during thermal compression, which can lead to potential short circuits and errors in X-ray tests.
Innovation Solution
The design includes an outer electrode plate smaller than the inner and second electrode plates, with the outer plate having a first active material layer on one surface and a Z-shaped separator to prevent deformation, ensuring proper alignment and adhesion forces during the heat-press process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer electrode plate is made the same size as inner electrode plates, then the electrode assembly structure is simpler, but the outer electrode plate deforms during thermal compression causing safety issues and test errors
Solution Approach 1:
The patent applies local quality by making the outer electrode plate smaller than the inner electrode plates, creating a size gradient from outer to inner. This local variation in dimension prevents deformation during thermal compression while maintaining overall structural integrity, directly resolving the contradiction between reliability and complexity.
2Reliability
If the outer electrode plate is smaller than inner electrode plates, then deformation during thermal compression is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring the outer electrode plate to be smaller than inner electrode plates before assembly. This anticipates the thermal compression deformation that will occur during manufacturing and testing, and the size differential pre-established in the design prevents deformation without requiring ultra-precise control during subsequent manufacturing steps.
3Measurement precision
If standard electrode plate configuration is used, then manufacturing is easier, but X-ray test reliability decreases due to deformation
Solution Approach 1:
The patent applies local quality by making the outer electrode plate smaller than the inner electrode plates, creating a size gradient from outer to inner. This local variation in dimension prevents deformation during thermal compression while maintaining overall structural integrity, directly resolving the contradiction between reliability and complexity.
Data Source
AI summary
The present invention relates to a secondary battery capable of enhancing safety and test reliability. According to one embodiment, disclosed is a secondary battery comprising: an electrode assembly in which a first electrode plate and a second electrode plate are alternately stacked; and a case for accommodating the electrode assembly, wherein the first electrode plate includes an outer electrode plate located at the outermost part of the electrode assembly, and an inner electrode plate located inside the electrode assembly, and the outer electrode plate is smaller than the inner electrode plate and the second electrode plate.