Segmented Insulation for Secondary Battery Electrolyte Impregnation
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Solution Overview
Problem
Existing secondary batteries face challenges in optimizing electrolyte impregnation and insulation between the electrode assembly and the can, leading to suboptimal energy storage and stability.
Innovation Solution
Incorporating a first insulation member with an opening on the electrode assembly and a second insulation member on the can, both made of insulating and chemical-resistant materials, to enhance electrolyte impregnation and secure insulation, thereby improving battery capacity and reducing component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulation methods are used to insulate the electrode assembly from the can, then insulation is provided, but electrolyte impregnation capability deteriorates
Solution Approach 1:
The insulation member is segmented into multiple regions: a first region that contacts the electrode assembly to provide insulation, and a second region that does not contact the electrode assembly to allow electrolyte impregnation. This segmentation enables the insulation member to simultaneously provide insulation and facilitate electrolyte penetration into the battery.
Solution Approach 2:
Different regions of the insulation member have different functional properties: the first region has insulating properties to prevent electrical contact between the electrode assembly and can, while the second region has open or porous structure to enable electrolyte flow. This local differentiation of properties resolves the contradiction between insulation and electrolyte impregnation.
2Reliability
If insulation members completely cover the electrode assembly, then insulation is improved, but electrolyte penetration and energy storage capability deteriorate
Solution Approach 1:
The insulation member is divided into a first region for insulation and a second region for electrolyte access, allowing the battery to maintain good insulation while enabling sufficient electrolyte penetration for optimal energy storage performance.
Solution Approach 2:
The insulation member exhibits local quality differentiation where the first region provides insulating properties and the second region provides open structure for electrolyte flow, enabling the battery to achieve both reliable insulation and high energy storage capability simultaneously.
3Ease of manufacture
If conventional insulation structures are used, then manufacturing is simplified, but battery capacity and performance are suboptimal
Solution Approach 1:
The insulation member is manufactured as a single integrated component with segmented functional regions, combining the simplicity of single-piece manufacturing with the performance benefits of differentiated functional zones for both insulation and electrolyte impregnation.
Solution Approach 2:
The insulation member serves multiple functions simultaneously: it provides electrical insulation in the first region and facilitates electrolyte impregnation in the second region, replacing the need for separate insulation and electrolyte delivery components, thus simplifying manufacturing while enhancing battery capacity.
Data Source
AI summary
A secondary battery including an electrode assembly; a can accommodating the electrode assembly; a cap assembly sealing the can; a first insulation member on a side of the electrode assembly, the first insulation member having an opening exposing at least a portion of a bottom surface of the electrode assembly; and a second insulation member on a bottom of the can and facing the bottom surface of the electrode assembly, the second insulation member having an area corresponding to an area of the opening in the first insulation member.