Partitioned Battery Case for Uniform Electrolyte Impregnation
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Solution Overview
Problem
In nonaqueous electrolyte secondary batteries, the impregnation of electrolyte solution into the electrode assembly is often non-uniform, leading to incomplete discharge and irreversible reactions due to trapped gases and uneven formation of the solid electrolyte interface (SEI) protection film.
Innovation Solution
An energy storage device design featuring a partition member that separates the gap between the case and the electrode assembly, with the electrolyte solution pouring hole positioned closer to one end, ensuring uniform impregnation by directing the electrolyte solution to enter from one end and discharging gases from the other end, thereby minimizing gas retention and promoting uniform SEI formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrolyte solution pouring hole is positioned at the center of the electrode assembly, then the electrolyte solution can reach the center portion, but gas becomes trapped in the center and impregnation becomes non-uniform
Solution Approach 1:
The gap between the case and electrode assembly is divided into multiple regions by partition members positioned at different locations along the winding axis. This segmentation creates separate flow paths that guide electrolyte solution from both ends toward the center, preventing gas entrapment and ensuring uniform impregnation without requiring a central pouring hole.
Solution Approach 2:
Partition members are introduced as intermediary structures between the case and electrode assembly. These partition members serve as mediators that redirect the electrolyte solution flow, creating pressure differential that pushes gas outward from the center while allowing electrolyte solution to penetrate uniformly throughout the electrode assembly.
2Object-generated harmful factors
If the electrolyte solution pouring hole is positioned at one end of the electrode assembly, then gas can be discharged from the other end, but the electrolyte solution pouring structure becomes more complex
Solution Approach 1:
The partition members serve multiple functions simultaneously: they guide electrolyte solution flow from both ends, create pressure differential for gas discharge, and structure the gap space. This multi-functionality allows effective gas discharge and uniform impregnation without requiring separate complex pouring structures at multiple locations.
Solution Approach 2:
Instead of solving the gas discharge problem by extending the pouring structure along the winding axis (one dimension), the invention uses partition members to create three-dimensional flow paths that utilize the radial dimension. This allows gas to be discharged from the center outward in multiple directions simultaneously, simplifying the overall structure.
3Manufacturing precision
If multiple electrolyte solution pouring holes are provided at different positions, then uniform impregnation can be achieved, but the number of parts and manufacturing complexity increases
Solution Approach 1:
The functions of multiple pouring holes and their associated pouring structures are merged into a single pouring hole combined with partition members. The partition members create multiple flow channels from one pouring location, achieving the impregnation uniformity that would otherwise require multiple separate pouring holes, thereby simplifying manufacturing.
Solution Approach 2:
Instead of changing the number of pouring holes (discrete parameter), the invention changes the flow distribution parameters by introducing partition members that alter the pressure gradient and flow path geometry. This continuous parameter change achieves uniform impregnation while maintaining a simple single-hole pouring structure.
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 uniform impregnation of the electrolyte solution, reducing the likelihood of irreversible reactions and enhancing the battery's charge-discharge performance by minimizing gas retention and promoting consistent SEI formation across the electrode assembly.
Implementation Method 1
the electrolyte solution poured in the battery container impregnates into spaces formed between the electrodes and the separator wound in a layered state
Data Source
AI summary
An energy storage device includes: an electrode assembly; a case for storing the electrode assembly therein, the case having an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed; and at least one partition member arranged in a gap formed between the case and the electrode assembly stored in the case. The partition member partitions the gap in the winding axis direction of the electrode assembly by surrounding the electrode assembly in the winding direction of the electrode. The electrolyte solution pouring hole is arranged at a position closer to one end of the electrode assembly than the partition member close to one end of the case is in the winding axis direction.