Secondary Battery Structural Component Deformation Suppression
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Solution Overview
Problem
Secondary batteries designed for curved electronic devices face issues of deformation due to curvature reduction and flattening, leading to potential lithium plating and reduced reliability.
Innovation Solution
A secondary battery design featuring a structural component fixed to the electrode assembly, which offsets deformation forces through a packaging bag, ensuring a curvature radius change rate less than 4% and reducing the risk of lithium plating, while allowing for efficient production and mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an arcuate battery is designed to fit curved electronic devices, then the battery can suit the shape of the device, but the battery undergoes deformation due to curvature reduction and flattening
Solution Approach 1:
The patent applies preliminary anti-action by introducing a structural component with opposite bending direction to counteract the deformation tendency of the electrode assembly. The structural component is pre-bent in the opposite direction to the electrode assembly's curvature, creating a balanced state that resists deformation during battery use and charging cycles.
Solution Approach 2:
The patent uses composite materials by combining the electrode assembly with a structural component made of different material properties. The structural component has higher rigidity and opposite bending characteristics, creating a composite structure that maintains both the curved shape adaptability and deformation resistance.
2Reliability
If the structural component is made larger to improve deformation suppression, then the deformation suppression ability increases, but the space occupied by the structural component increases
Solution Approach 1:
The patent applies local quality by positioning the structural component specifically at the second wall of the electrode unit where deformation occurs, rather than uniformly distributing structural support throughout the entire battery. The structural component's width and length are optimized to cover only the necessary area for deformation suppression.
Solution Approach 2:
The patent uses parameter changes by optimizing the width and length parameters of the structural component to achieve the minimum effective size. The structural component's dimensions are carefully controlled to provide sufficient deformation suppression while minimizing space occupation, with the width extending along the second direction and length extending in the bending direction.
3Reliability
If the curvature radius change rate is reduced to prevent lithium plating, then the safety improves, but the deformation suppression requires more complex structural components
Solution Approach 1:
The patent extracts the deformation suppression function into a separate structural component that is independently designed and positioned. This allows the electrode assembly to maintain its curved shape while the structural component specifically handles the mechanical stress, simplifying the overall design compared to making the entire battery structure more complex.
Data Source
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AI summary
A secondary battery (100) includes an electrode assembly (10), a structural component (20), and a packaging bag (30). The electrode assembly (10) is bent in a first direction. The electrode assembly (10) includes m electrode units, where m is an integer greater than or equal to 1. Each of the electrode units includes a first wall (111) and a second wall (112) sequentially disposed in the first direction. Both the first wall (111) and the second wall (112) are bent in the first direction. The structural component (20) is bent in the first direction. The structural component (20) is fixed to the electrode assembly (10). The structural component (20) is in contact with at least one of the first wall (111) or the second wall (112) of the electrode unit. The packaging bag (30) is configured to accommodate the electrode assembly (10) and the structural component (20). In this application, a force generated by a flattening tendency of a bent electrode unit (11) is transmitted to the structural component (20) through the packaging bag (30). The structural component (20) offsets at least a part of the force transmitted by the packaging bag (30), thereby suppressing deformation of the electrode unit.