Holed Battery Separator Structure for Faster Electrolyte Impregnation
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Solution Overview
Problem
Short circuits frequently occur between the negative and positive electrodes in secondary batteries due to pressure increases or electrode deterioration during charging and discharging, which can be exacerbated by inadequate electrolyte impregnation, leading to reduced battery capacity and lifespan.
Innovation Solution
Incorporating a separator with holes formed in the stacking direction to facilitate electrolyte penetration and optimize impregnation, thereby creating a path for electrolyte movement within the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator without holes is used to prevent short circuits, then safety is improved, but electrolyte impregnation becomes inadequate leading to reduced battery capacity
Solution Approach 1:
The separator is designed with holes formed in the stacking direction, creating a porous structure that allows electrolyte to penetrate through the separator while maintaining its short circuit prevention function. The holes serve as channels for electrolyte flow, ensuring adequate impregnation of the electrode assembly without compromising safety.
Solution Approach 2:
Instead of relying solely on lateral electrolyte movement through the separator, the invention introduces vertical pathways by forming holes in the stacking direction. This dimensional change creates direct through-paths for electrolyte penetration, improving impregnation efficiency while maintaining separator integrity for short circuit prevention.
2Reliability
If the separator is made thicker to improve short circuit prevention, then safety is improved, but electrolyte penetration time increases leading to longer impregnation time
Solution Approach 1:
The separator is segmented with multiple holes distributed throughout its structure, dividing the penetration path into multiple parallel channels. This segmentation allows electrolyte to simultaneously penetrate through multiple pathways, reducing the overall impregnation time while maintaining adequate thickness for safety.
Solution Approach 2:
The holes in the separator act as intermediaries that facilitate rapid electrolyte transport through the separator thickness. These holes serve as dedicated channels that mediate between the external electrolyte source and the internal electrode structures, enabling fast penetration without compromising the separator's protective function.
3Quantity of substance
If holes are added to the separator to improve electrolyte impregnation, then battery capacity is improved, but the separator structure becomes more complex
Solution Approach 1:
The separator utilizes a porous structure with holes formed in the stacking direction, which is a well-established material design approach. This porous configuration improves electrolyte impregnation while maintaining relatively simple manufacturing processes, avoiding excessive structural complexity.
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
Improved electrolyte impregnation enhances battery capacity and extends the lifespan by ensuring uniform electrolyte distribution and reducing the risk of short circuits.
Implementation Method 1
the separator includes one or more holes formed in the stacking direction of the separator
Data Source
AI summary
The present disclosure relates to an electrode assembly, and a technical problem to be addressed includes providing an electrode assembly with improved impregnation. The present disclosure describes an electrode assembly that includes a first electrode and a second electrode, and a separator between the first electrode and the second electrode. The electrodes and the separator are stacked in one direction, and the separator includes one or more holes formed in the stacking direction of the separator.