Cylindrical Battery Electrode Flattening for Vibration Resistance
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving superior vibration resistance while maintaining manufacturability, particularly due to the movement of the electrode wound body within the battery can during vibrations.
Innovation Solution
The secondary battery design includes a configuration where the flattening of the electrode wound body's upper part is greater than the flattening of the lower part, allowing easier assembly and preventing movement during vibrations by ensuring the electrode wound body remains stable within the battery can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode wound body is made with uniform flattening throughout, then the manufacturing process is simpler, but the battery exhibits poor vibration resistance due to electrode movement
Solution Approach 1:
The electrode wound body is designed with non-uniform flattening distribution, where the upper portion has greater flattening than the lower portion. This local variation in geometric properties prevents the electrode from moving during vibration while maintaining manufacturing feasibility, resolving the contradiction between vibration resistance and structural complexity.
2Reliability
If the electrode wound body has high flattening throughout, then vibration resistance is improved, but assembly difficulty increases due to insertion problems
Solution Approach 1:
The lower portion of the electrode wound body maintains smaller flattening to facilitate easy insertion during assembly, while the upper portion has greater flattening to prevent movement during vibration. This localized differentiation resolves the contradiction between assembly ease and vibration resistance.
3Reliability
If the electrode wound body is secured tightly to prevent movement, then vibration resistance is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of adding complex securing mechanisms, the patent changes the geometric parameters of the electrode wound body itself by creating non-uniform flattening distribution. This intrinsic geometric modification prevents movement during vibration without requiring additional structural elements, resolving the contradiction between vibration resistance and manufacturing complexity.
Data Source
AI summary
Provided is a secondary battery that is superior in vibration resistance but not degraded in manufacturability. The secondary battery includes an electrode wound body and a battery can. The electrode wound body includes a positive electrode and a negative electrode that are stacked on each other with a separator interposed between the positive electrode and the negative electrode and are wound around a central axis The battery can has a circular columnar outer shape in which a height direction corresponds to a direction along the central axis. The battery can contains the electrode wound body. The battery can includes a container and a cover part. The container includes a lower end part and an upper end part. The lower end part is closed by a bottom part. The upper end part is positioned on a side opposite to the lower end part in the height direction and has an opening through which the electrode wound body is passable. The cover part closes the opening of the container. Where a flattening of the electrode wound body is a ratio of a maximum diameter of the electrode wound body to a minimum diameter of the electrode wound body, the flattening of at least a portion of an upper part of the electrode wound body is greater than the flattening of at least a portion of a lower part of the electrode wound body.