Crossed-Pore Separator Structure for Rechargeable Battery Electrolyte Retention
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Solution Overview
Problem
Rechargeable batteries face output deterioration and shortened lifespan due to insufficient electrolyte solution retention, as the electrolyte is squeezed out during repeated charging and discharging, leading to improper ion movement and electrode degradation.
Innovation Solution
The electrode assembly features a first separator with pores elongated in one direction and a second separator with pores elongated in a perpendicular or oblique direction, allowing for efficient electrolyte solution retention by creating non-overlapping regions that maintain a higher electrolyte concentration, thereby reducing electrolyte loss and electrode expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator absorbs a sufficient amount of electrolyte solution to maintain stable output, then ion conductivity is maintained, but during repeated charging and discharging the electrolyte solution is squeezed out leading to output deterioration and shortened lifespan
Solution Approach 1:
The separator is divided into multiple layers with different pore orientations. The first separator layer has pores extending in a first direction, while the second separator layer has pores extending in a second direction that crosses the first direction. This segmentation allows each layer to retain electrolyte solution in different spatial orientations, preventing complete electrolyte loss during electrode expansion and contraction cycles.
Solution Approach 2:
Different regions of the separator structure are given different properties through the cross-oriented pore configuration. The first separator layer provides electrolyte retention in one direction, while the second separator layer provides retention in a perpendicular direction. This local differentiation ensures comprehensive electrolyte retention from multiple directions, addressing the squeezing out problem during充放电 cycles.
2Reliability
If the separator retains sufficient electrolyte solution, then ion movement is proper, but electrode expansion during charging squeezes out the electrolyte solution
Solution Approach 1:
The invention transitions from a single-layer separator with pores in one direction to a multi-layer structure with pores in multiple directions (first direction and second crossing direction). This dimensional expansion of the pore structure allows electrolyte solution to be retained from multiple spatial orientations, compensating for the squeezing effect during electrode expansion and maintaining sufficient electrolyte quantity for proper ion movement.
3Device complexity
If a single separator structure is used, then the structure is simple, but it cannot retain sufficient electrolyte solution during repeated charging and discharging
Solution Approach 1:
The separator is segmented into multiple layers with distinct pore orientations. The first separator layer contains pores extending in a first direction, while the second separator layer contains pores extending in a second direction that crosses the first direction. This segmentation creates a more complex structure that provides superior electrolyte retention capabilities during repeated charging and discharging cycles.
Solution Approach 2:
The separator is constructed as a composite structure combining multiple separator layers with different pore orientations. This composite configuration integrates the advantages of each layer, creating a separator that retains electrolyte solution more effectively than a single-layer structure, thereby improving reliability during repeated充放电 operations.
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
This configuration ensures stable battery output and extends the battery's lifespan by retaining a sufficient amount of electrolyte solution, reducing degradation and the risk of internal short circuits.
Implementation Method 1
a first separator between the first electrode and the second electrode, the first separator having a plurality of first pores, each of the first pores elongated in a first direction; and a second separator on an opposite side of the first electrode from the first separator, the second separator having a plurality of second pores, each of the second pores elongated in a second direction crossing the first direction
Data Source
AI summary
An electrode assembly and a rechargeable battery having an electrode assembly. An electrode assembly for a rechargeable battery includes a first electrode; a second electrode; a first separator between the first electrode and the second electrode, the first separator having a plurality of first pores, each of the first pores elongated in a first direction; and a second separator on an opposite side of the first electrode from the first separator, the second separator having a plurality of second pores, each of the second pores elongated in a second direction crossing the first direction.