Battery Corner Elastic Supports for Electrode Assembly Stability
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Solution Overview
Problem
Secondary batteries face instability and reduced lifespan due to movement of the electrode assembly under strong and irregular external impact loads, such as those encountered in vehicle operations, leading to potential short circuits and deterioration.
Innovation Solution
The implementation of corner elastic members with specific geometric configurations at the battery case corners to securely fit the electrode assembly, using non-metallic materials with excellent elasticity to absorb and prevent movement, and the use of a bottom elastic body to support the assembly vertically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is disposed on the outer surface of the electrode assembly to prevent short circuit, then short circuit prevention is improved, but stability under strong and irregular external impact loads deteriorates
Solution Approach 1:
The protective structure is divided into multiple corner elastic members positioned at each corner of the battery case, rather than using a single continuous protective film. This segmentation allows each corner member to independently absorb impact forces, improving overall stability under external loads while maintaining short circuit prevention through the protective film.
Solution Approach 2:
The solution combines a protective film (for electrical insulation) with corner elastic members made of elastic material (for mechanical impact absorption). This composite approach integrates two different material functions: the film prevents short circuits while the elastic members provide mechanical stability under impact loads, resolving the contradiction between electrical protection and mechanical stability.
2Stability of the object's composition
If the electrode assembly is secured rigidly to prevent movement, then stability is improved, but adaptability to external impact loads deteriorates
Solution Approach 1:
The corner elastic members are made of elastic material that can dynamically deform and rebound in response to external impact loads. This dynamic characteristic allows the structure to adapt to varying impact forces while maintaining electrode assembly stability, rather than using a rigid fixed structure that would be brittle under irregular loads.
Solution Approach 2:
The elastic corner members are pre-positioned at the corners of the battery case to provide cushioning before impact occurs. When external impacts occur during vehicle operation, these pre-positioned elastic members absorb and distribute the impact forces, protecting the electrode assembly from movement while adapting to the magnitude and direction of the impacts.
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
Prevents electrode assembly movement and enhances stability under external impact, maintaining battery integrity and extending its lifespan by effectively absorbing irregular loads.
Implementation Method 1
a corner elastic member, having a rod shape, provided to be fixed to each of four corners of the cap plate, and formed of an elastic material
Data Source
AI summary
A secondary battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator isolating the positive electrode and the negative electrode from each other, a battery case having an accommodation space accommodating the electrode assembly and including at least one opening, a cap plate coupled to the battery case to form the accommodation space, and a corner elastic member, having a rod shape, provided to be fixed to each of four corners of the cap plate, and formed of an elastic material.