Secondary Battery Bottom Retainer Shock Absorption
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Solution Overview
Problem
Secondary batteries face issues such as electrode assembly unwinding due to weight and vibrations, safety concerns from external shocks, and performance degradation from electrolyte accumulation, which existing technologies have not adequately addressed.
Innovation Solution
A secondary battery design featuring a bottom retainer with a support portion and contact portion that continuously pushes the electrode assembly to prevent unwinding, absorbs external shocks, and includes holes for smooth electrolyte flow and gas discharge, enhancing safety and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the electrode assembly is supported without a bottom retainer, then the device complexity is reduced, but the electrode assembly becomes unwound due to its own weight and vibrations
Solution Approach 1:
The bottom retainer is divided into a support portion and a contact portion, with the support portion having multiple holes. This segmentation allows the structure to provide stable support while maintaining simplicity and enabling electrolyte penetration, resolving the contradiction between stability and complexity.
Solution Approach 2:
The support portion of the bottom retainer includes multiple holes, creating a porous structure that allows electrolyte to pass through. This porous design provides mechanical support stability while maintaining fluid permeability, preventing electrode unwinding without adding excessive complexity.
2Productivity
If the bottom retainer has a solid structure without holes, then the manufacturing precision is improved, but the electrolyte accumulates at the case bottom and performance degrades
Solution Approach 1:
The support portion incorporates multiple holes that allow electrolyte to penetrate through the bottom retainer. This porous structure prevents electrolyte accumulation at the case bottom, maintaining battery performance while the holes are positioned and sized with appropriate precision.
Solution Approach 2:
Holes are extracted from the support portion of the bottom retainer, creating passages for electrolyte flow. This extraction of material from the solid structure enables electrolyte penetration, preventing performance degradation while maintaining adequate manufacturing precision for the hole positions and dimensions.
3Stability of the object's composition
If the bottom retainer has no contact portion, then the device complexity is reduced, but the electrode assembly cannot be continuously pushed and becomes unwound
Solution Approach 1:
The bottom retainer is segmented into distinct functional portions: a support portion that provides structural support and a contact portion that contacts the case bottom. This segmentation enables the contact portion to continuously push the electrode assembly, preventing unwinding while keeping the overall structure relatively simple.
Solution Approach 2:
The bottom retainer serves multiple functions through its different portions: the support portion provides mechanical support and allows electrolyte flow, while the contact portion provides continuous pushing force against the case bottom. This multi-functionality achieves electrode stability without requiring multiple separate components.
4Reliability
If the bottom retainer does not absorb external shocks, then the structure is simpler, but the safety suffers due to damage from external shocks
Solution Approach 1:
The bottom retainer is designed with a contact portion that extends toward the case bottom, creating a cushioning structure that absorbs external shocks before they can damage the electrode assembly. This beforehand cushioning improves battery safety while maintaining relatively simple structure.
Solution Approach 2:
The bottom retainer's contact portion is designed with specific geometric parameters (extension length, thickness, material properties) that enable it to absorb external shocks. By optimizing these parameters, the structure achieves shock absorption capability and improved safety without requiring complex additional components.
Data Source
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Figure 3A~3B
AI summary
There is provided a secondary battery, in which a contact portion is formed on a bottom retainer to make contact with a bottom of a case, thus performing a tension function. The secondary battery includes an electrode assembly having a first electrode, a second electrode, and a separator interposed between the first and second electrodes. A case is configured to accommodate the electrode assembly therein, with an opening formed in a top of the case. A cap plate is configured to close the opening of the case. A bottom retainer is disposed on a bottom in the case. The bottom retainer includes a support portion to support the electrode assembly, and at least one contact portion to make contact with the bottom of the case. This configuration renders the contact portion to absorb external shocks, thus increasing durability, in addition to enhancing the safety of the secondary battery.