Secondary Battery Insulating Film Protuberance Vibration
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Solution Overview
Problem
Secondary batteries face durability issues due to vibration, particularly in medium or large-sized batteries where the electrode assembly can move significantly relative to the case, leading to potential damage and reduced performance.
Innovation Solution
The implementation of an insulating film with a protuberance pattern that corresponds to the shape of the electrode assembly and current collectors, providing an elastic compensation for vibrations and enhancing the structural integrity by distributing forces across the case's walls, thereby reducing movement and stress on the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is made larger to increase battery capacity, then the energy storage increases, but the electrode assembly moves more significantly relative to the case due to vibration, leading to durability issues
Solution Approach 1:
The insulating film is designed with a protuberance pattern that creates flexible, wave-like structures. These protuberances act as flexible elements that can deform elastically under vibrational stress, allowing the film to accommodate movements of the electrode assembly while maintaining insulation and structural support. The flexible film structure absorbs vibration energy and reduces the transmission of harmful forces to the electrode assembly, thereby improving durability without compromising battery capacity.
2Strength
If the insulating film is made thicker to provide better insulation and support, then the insulation performance improves, but the film becomes stiffer and less able to compensate for vibrations
Solution Approach 1:
The insulating film features a protuberance pattern with curved, wave-like structures instead of flat surfaces. These curved protuberances create a compliant structure that can deform elastically under vibrational loads. The curvature allows the film to maintain its insulating thickness while introducing flexibility through the geometric form, enabling the film to absorb and compensate for vibrations without compromising insulation performance.
Solution Approach 2:
The insulating film's physical parameters are optimized by varying the protuberance pattern characteristics such as height, wavelength, and amplitude. By adjusting these parameters, the film achieves an optimal balance between thickness (for insulation) and flexibility (for vibration compensation). The protuberance pattern allows the film to maintain adequate thickness for insulation while the geometric features provide the necessary compliance to handle vibrational stresses.
3Ease of manufacture
If the insulating film has a flat surface, then the manufacturing is simpler, but it cannot effectively absorb and compensate for vibrations
Solution Approach 1:
The insulating film incorporates a protuberance pattern with curved, wave-like structures that replace flat surfaces. These curved features are designed to flex and deform under vibrational stress, enabling the film to absorb and compensate for vibrations. The protuberance pattern can be manufactured using standard embossing or molding techniques, maintaining ease of production while significantly improving vibration absorption capability compared to flat films.
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
The insulating film with a protuberance pattern effectively absorbs and compensates for vibrations, enhancing the durability and stability of the secondary battery by reducing the impact of rotational and vibrational forces on the electrode assembly and current collectors, thus improving overall battery performance and longevity.
Implementation Method 1
providing an elastic compensation for vibrations
Data Source
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AI summary
The present invention refers to a secondary battery including an electrode assembly, the electrode assembly including a separator between a positive electrode and a negative electrode; current collectors, the current collectors being electrically connected to the positive electrode and the negative electrode, respectively; a case, the case accommodating the electrode assembly and the current collectors; a cap plate, the cap plate coupled to an opening in the case; and an insulating film, the insulating film insulating the electrode assembly and the electrode collectors from the case, wherein the insulating film includes a protuberance pattern on at least one surface thereof to compensate for vibration of the electrode assembly current collectors with respect to the case.