Pouch Battery End Structure to Prevent Inward Suction
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Solution Overview
Problem
Pouch-type secondary batteries experience inward suction of the end due to electrolyte consumption during charging and discharging, leading to deformation and potential interference with the electrode assembly.
Innovation Solution
Incorporating a flat part with greater rigidity than the pouch, combined with a guide part, to define a plane at the end of the pouch and prevent inward deformation, maintaining the pouch shape even with reduced electrolyte levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pouch is made of a relatively easily deformed material to accommodate the electrode assembly, then the pouch can flexibly adapt to the electrode assembly shape, but the pouch end is easily suctioned inward when electrolyte is consumed during charging and discharging
Solution Approach 1:
The end of the pouch is divided into two functional parts: a flat part with high rigidity to maintain shape and prevent suction, and a pouch body made of easily deformed material for flexibility. This segmentation allows each part to perform its specific function optimally.
Solution Approach 2:
The pouch structure is designed with non-uniform properties: the flat part at the end has high rigidity to resist suction, while the main pouch body maintains easy deformability for flexibility. This local quality differentiation resolves the contradiction between overall flexibility and end stability.
2Ease of manufacture
If the pouch material is made easily deformed to accommodate electrode assembly, then the pouch can be manufactured and assembled easily, but the pouch end deforms inward when electrolyte levels reduce during operation
Solution Approach 1:
The pouch end is segmented into a flat part and a pouch body, where the flat part maintains shape reliability while the pouch body retains manufacturing ease through its easily deformed material properties.
Solution Approach 2:
The flat part at the pouch end has locally enhanced rigidity to ensure shape maintenance during operation, while the rest of the pouch maintains its easily deformed characteristics for ease of manufacture and assembly.
3Stability of the object's composition
If a flat part with greater rigidity is incorporated into the pouch end, then the pouch shape is maintained even with reduced electrolyte levels, but the device complexity increases
Solution Approach 1:
The pouch end is segmented into a flat part and pouch body, creating a simple binary structure that maintains shape stability without requiring complex mechanisms or multiple components.
Solution Approach 2:
Rather than making the entire pouch complex, only the flat part at the end has enhanced rigidity properties, keeping the overall device complexity low while achieving the desired shape stability.
Data Source
AI summary
A secondary battery includes: an electrode assembly having a positive electrode plate, a negative electrode plate, and a separator between the positive electrode plate and the negative electrode plate; a pouch having an inner space in which the electrode assembly is accommodated; a flat part forming a plane on an end of the pouch; and a guide part installed around the flat part and having a shape that protrudes further than the flat part.