Pouch Cell Compression Structure for Terrace Swelling Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional secondary battery charging and discharging apparatuses fail to effectively suppress the swelling phenomenon at the terrace portion of secondary battery cells, leading to insulation voltage faults during the charging and discharging process.
Innovation Solution
The apparatus incorporates gripper units and push bar units mounted on compression plates to press the electrode lead and terrace portion of the secondary battery cell, respectively, ensuring uniform pressure and preventing swelling by adjusting the positions of these units for different cell sizes and using cell entry guides for accurate mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only the body portion of the secondary battery cell is pressed by the compression plate, then the thickness increase due to gas generation is suppressed, but the terrace portion is not pressed and swelling occurs leading to insulation voltage faults
Solution Approach 1:
The compression plate is divided into a first compression plate that presses the body portion and a second compression plate that presses the terrace portion. This segmentation allows each plate to perform its specific function independently, ensuring both the body and terrace portions are properly compressed without causing swelling or insulation voltage faults.
Solution Approach 2:
A support member is introduced as an intermediary component between the second compression plate and the terrace portion. The support member has a pressing surface that contacts the terrace portion and transmits the compression force uniformly, preventing direct contact issues and ensuring reliable compression of the terrace portion to prevent swelling.
2Stability of the object's composition
If the compression plate presses the body portion to suppress thickness increase, then gas generation is contained, but the inner pressure increases and breaks the bonding layer of the terrace portion
Solution Approach 1:
The compression force is segmented into two separate applications: one on the body portion and another on the terrace portion. The second compression plate specifically targets the terrace portion to apply controlled pressure that prevents bonding layer breakage while still containing the gas generation effects.
Solution Approach 2:
Different compression forces and methods are applied to different parts of the cell. The body portion receives compression to suppress thickness increase, while the terrace portion receives specific compression through the support member to prevent bonding layer breakage. This localized quality approach ensures each region is treated according to its specific requirements.
3Adaptability or versatility
If the charging and discharging apparatus uses a simple compression plate design, then the device complexity is low, but it cannot accommodate different cell sizes and maintains consistent pressure
Solution Approach 1:
The compression apparatus is designed with multi-functional components that can adapt to different cell sizes. The support member with its specific pressing surface configuration can work with various terrace portion dimensions, and the dual-plate system can accommodate different cell body sizes, providing universal applicability across different battery formats.
Solution Approach 2:
The compression system incorporates dynamic elements that allow adjustment and adaptation during operation. The support member can be positioned to match different terrace portions, and the compression plates can apply varying forces as needed, enabling the system to dynamically adapt to different cell sizes while maintaining consistent and appropriate pressure.
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 design significantly reduces insulation voltage failure rates by ensuring consistent pressure on both the electrode lead and terrace portion, preventing swelling and enhancing compatibility with various secondary battery cell sizes.
Implementation Method 1
the compression plates moving to reduce a gap therebetween to press a body of the secondary battery cell
Implementation Method 2
push bar units respectively mounted to the compression plates to be adjacent to the gripper units and configured to press a terrace portion of the secondary battery cell
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed is a secondary battery charging and discharging apparatus for performing a secondary battery activation process. The secondary battery charging and discharging apparatus includes a plurality of compression plates disposed to face each other to form a cell insert space therebetween in which a secondary battery cell is disposed, the plurality of compression plates moving to reduce a gap therebetween to press a body of the secondary battery cell; gripper units respectively mounted to the compression plates to move integrally with the compression plates, the gripper units coming into contact with an electrode lead of the secondary battery cell when the compression plate presses the body of the secondary battery cell; and push bar units respectively mounted to the compression plates to be adjacent to the gripper units and configured to press a terrace portion of the secondary battery cell adjacent to the electrode lead.