Battery Cell Activation for Gas Release With Low Electrolyte Loss
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Solution Overview
Problem
Existing methods struggle to efficiently discharge gas trapped between electrodes and separators in battery cells while minimizing electrolyte solution discharge during the degassing process.
Innovation Solution
A two-step pressing method is employed, where the second pressing applies lower pressure than the first, combined with a vacuum treatment to widen the electrode-separator interface and facilitate gas discharge, while preventing excessive electrolyte loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied during pressing to maximize gas discharge, then gas discharge efficiency is improved, but electrolyte solution discharge increases
Solution Approach 1:
The pressing process is divided into multiple stages with different pressure levels. The first pressing stage uses high pressure to maximize gas discharge, while the second pressing stage uses reduced pressure to minimize electrolyte solution discharge. This segmentation of the pressing operation allows optimization of each stage for its specific purpose.
Solution Approach 2:
The pressing operation is performed periodically with alternating pressure conditions. High pressure pressing is applied initially for gas discharge, followed by vacuum treatment, then lower pressure pressing is applied subsequently. This periodic variation in pressure conditions enables effective gas removal while preserving electrolyte solution.
2Productivity
If vacuum treatment is applied to remove gas, then gas discharge is improved, but electrolyte solution may be discharged
Solution Approach 1:
High pressure pressing is applied before vacuum treatment to pre-compress the electrode assembly and seal the structure. This preliminary compression prevents electrolyte solution from being discharged during the subsequent vacuum treatment, while still allowing trapped gas to be effectively removed through the vacuum process.
3Manufacturing precision
If pressing is applied to compress electrode assembly, then cell density is improved, but gas discharge becomes difficult
Solution Approach 1:
Instead of applying pressure to improve density first and then attempting gas discharge, the process inverts the sequence by applying high pressure first to facilitate gas discharge, then using vacuum treatment for further gas removal, and finally applying moderate pressure to achieve proper density. This inverted approach prioritizes gas removal before density optimization.
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
The method effectively discharges trapped gas and minimizes electrolyte loss, improving battery cell quality and efficiency.
Implementation Method 1
exposing the battery cell to a vacuum condition
Implementation Method 2
exposing the battery cell to a vacuum condition
Data Source
AI summary
A method of activating a battery cell and a method of manufacturing a battery cell including the same, and more particularly, to a battery cell activation method capable of easily discharging gas trapped between a separator and an electrode inside an electrode assembly of a battery cell, and preventing discharge of a large amount of electrolyte solution during a gas discharging process, and a method of manufacturing a battery cell including the same.