Pouch Cell Transport Pressurization to Limit Electrolyte Sloshing
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Solution Overview
Problem
During the transportation of unsealed secondary batteries filled with electrolyte, the fluid motion of the electrolyte can cause delamination or folding of the separator, leading to safety issues such as short circuits and ignition.
Innovation Solution
A transport device with a gripping part that includes vertical guides and a pressurizing mechanism to control the fluid motion of the electrolyte, using a gripper actuated by the weight of the pouch cell and a pressurizing part with elastic members to minimize electrolyte movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pouch cell is transported without pressurization, then the transportation process is simple, but the electrolyte fluid motion causes delamination or folding of the separator
Solution Approach 1:
The transport device is segmented into multiple functional components: vertical guides for positioning, grippers for holding, and pressurizing parts for controlling electrolyte. This segmentation allows each component to perform its specific function independently, ensuring separator integrity while maintaining manageable device complexity.
Solution Approach 2:
The pressurizing part applies pressure to the pouch cell surface before and during transportation to prevent electrolyte fluid motion. This preliminary action stabilizes the electrolyte, preventing delamination or folding of the separator that would occur during transport without pressurization.
2Reliability
If the pressurizing part applies continuous pressure, then the separator is protected from folding, but the pouch cell surface may be damaged
Solution Approach 1:
The pressurizing part includes a cushioning mechanism that applies pressure gradually and maintains it within a safe range. The elastic member or spring provides cushioning to prevent excessive pressure that could damage the pouch cell surface, while still maintaining enough pressure to prevent electrolyte fluid motion and separator folding.
Solution Approach 2:
The pressurizing part dynamically adjusts the pressure parameter applied to the pouch cell. By changing the pressure level according to the transport conditions, the device maintains separator integrity while avoiding surface damage. The pressure is optimized to be sufficient for stability but not excessive for the pouch material.
3Reliability
If the vertical guides are positioned close to the pouch cell, then the electrolyte motion is controlled, but the pouch cell may be constrained excessively
Solution Approach 1:
The vertical guides are positioned to provide localized support and constraint only where needed for electrolyte stability. The guides are arranged to control electrolyte motion in critical areas while leaving other areas of the pouch cell free for easy insertion and operation. This localized approach maintains electrolyte stability without excessive overall constraint.
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 device effectively reduces electrolyte fluid motion, preventing interfacial delamination and separator folding, thereby enhancing the safety of the battery by minimizing the risk of internal short circuits and cell ignition.
Implementation Method 1
an elastic member disposed between the upper end part of the gripper and the pressurization guide
Implementation Method 2
a pressurization guide located on an inner side of the vertical guide and controls a fluid motion of the electrolyte by pressurizing the surface of the pouch cell
Implementation Method 3
a gripper actuated by a weight of the pouch cell inserted between a pair of vertical guides
Data Source
AI summary
A transporting device for transporting a pouch battery cell filled with electrolyte, wherein by including a vertical guide for supporting the pouch cell, a gripper for fixing the surface of the pouch cell by the weight of the pouch cell, and a pressurizing part for controlling the fluid motion of the electrolyte injected therein, the transporting device has the advantage that the fluid motion of the electrolyte can be reduced during transportation of the pouch cell, and has an excellent effect of improving the phenomena of interfacial delamination of the electrode and the separator, folding phenomenon of the separator, and the like.