Cylindrical Cell Fixing for Uniform Electrolyte Impregnation
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Solution Overview
Problem
Existing methods for impregnating electrolytes in cylindrical battery cells often result in uneven distribution, with residual electrolyte accumulating at the bottom and failing to properly saturate the upper portion due to capillary action and narrow gaps between electrodes, leading to suboptimal battery performance.
Innovation Solution
A battery cell fixing device with holder units and a rotator system that applies centrifugal force and vibration to ensure uniform electrolyte impregnation across the entire electrode assembly, compatible with various cylindrical battery cell sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrolyte is injected through the top opening of the cylindrical battery cell, then the electrolyte can be introduced into the battery cell, but the electrolyte stays only in the upper portion due to capillary action and cannot be transmitted well to the lower portion
Solution Approach 1:
The patent applies vibration to the cylindrical battery cell during electrolyte impregnation. The vibration device generates mechanical vibrations that propagate through the battery cell structure, disrupting capillary action barriers and enabling electrolyte to overcome surface tension effects. This allows uniform electrolyte distribution from the upper portion to the lower portion of the electrode assembly, resolving the contradiction between electrolyte introduction and uniform distribution.
Solution Approach 2:
The patent changes physical parameters during the impregnation process by applying vibration at specific frequencies and amplitudes. These parameter changes affect the fluid dynamics of the electrolyte, reducing its effective viscosity and surface tension influence, thereby enabling it to penetrate narrow gaps between electrodes uniformly throughout the entire battery cell volume.
2Quantity of substance
If vacuuming and pressurizing are applied after electrolyte injection, then the electrolyte can be forced into the battery cell, but the impregnation rate remains different at the top and bottom of the electrode assembly
Solution Approach 1:
The vibration device is applied during the vacuuming and pressurizing process to counteract the non-uniform distribution caused by pressure differential. The mechanical vibrations redistribute the electrolyte dynamically, ensuring that both upper and lower portions of the electrode assembly receive adequate electrolyte saturation, thereby achieving uniform impregnation rates throughout the battery cell.
3Volume of moving object
If the gap between positive electrode plate, separator and negative electrode plate is very narrow, then the battery structure is compact, but the electrolyte injected through the top opening cannot be transmitted well to the lower portion due to capillary action
Solution Approach 1:
The vibration device generates mechanical vibrations that propagate through the narrow gaps between electrodes, disrupting capillary action barriers. This enables electrolyte to overcome surface tension effects and narrow gap resistance, achieving efficient transmission from the top opening to the lower portion of the compact battery cell structure.
Solution Approach 2:
The patent changes the physical state parameters of the electrolyte delivery process by applying vibration, which temporarily reduces the effective surface tension and viscosity of the electrolyte. This parameter change enables the electrolyte to flow more easily through the narrow gaps between electrodes, maintaining compact battery design while improving transmission efficiency.
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 solution achieves improved electrolyte impregnation rates, stabilizes the fixation of cylindrical battery cells, and enhances the transmission of vibration for efficient electrolyte distribution, addressing the limitations of existing methods by ensuring uniform saturation and increased battery performance.
Implementation Method 1
A battery cell fixing device with holder units and a rotator system that applies centrifugal force and vibration to ensure uniform electrolyte impregnation
Implementation Method 2
A battery cell fixing device with holder units and a rotator system that applies centrifugal force and vibration to ensure uniform electrolyte impregnation
Implementation Method 3
since the gap between the positive electrode plate, the separator and the negative electrode plate constituting the electrode assembly is very narrow, the electrolyte injected through the top opening of the battery can may stay only in the upper portion of the battery can due to capillary action
Data Source
AI summary
A battery cell fixing device includes a plurality of holders configured to be coupled to a cylindrical battery cell along an outer circumference of the cylindrical battery cell, and each of the plurality of holders includes a holder body configured to cover a part of the outer circumference of the cylindrical battery cell; and a beading fixer configured to protrude toward the cylindrical battery cell from the holder body and to be inserted into a beading portion that is formed in the outer circumference of the cylindrical battery cell.