Curved Pouch Battery Sealing with Segmented Cup and Flat Seal
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Solution Overview
Problem
The reliability of sealing in curved pouch-type batteries is compromised due to unpredictable wrinkling of the exterior packaging member's surface when shaped into a curved form, leading to potential leakage and reduced productivity in manufacturing.
Innovation Solution
A pouch-type battery design featuring a cup section with concave or convex portions on the top surface and a flat sealing section, where the cup section is formed first and then the packaging member is curved, ensuring a consistent and reliable sealing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exterior packaging member is shaped into a curved form to match wearable device surfaces, then the battery can be applied to curved portable electronic apparatuses, but the sealing surface becomes wrinkled and sealing reliability deteriorates
Solution Approach 1:
The exterior packaging member is divided into two functional zones: the cup section top surface with concave/convex portions that allows curvature, and the sealing section with flat surface that maintains sealing integrity. This segmentation enables different parts to serve different purposes - the cup section provides adaptability to curved shapes while the sealing section preserves reliable bonding
Solution Approach 2:
Different surface qualities are applied to different regions of the exterior packaging member. The cup section top surface has a corrugated structure with concave/convex portions that enables curvature, while the sealing section has a flat surface that prevents wrinkling during bonding. This local differentiation resolves the contradiction by giving each region the quality it needs for its specific function
2Ease of operation
If corrugated sections are formed on the entire exterior packaging member to achieve high flexibility, then the battery can be bent and shaped, but the sealing section becomes difficult to bond reliably
Solution Approach 1:
The exterior packaging member is segmented into the cup section with corrugated top surface for flexibility and the sealing section with flat surface for reliable bonding. This segmentation allows the battery to be bent and shaped through the cup section while maintaining reliable sealing at the bonding section
Solution Approach 2:
The corrugated structure is applied locally only to the cup section top surface where flexibility is needed, while the sealing section maintains a flat surface quality that enables reliable bonding. This local quality differentiation resolves the contradiction between flexibility and sealing reliability
3Shape
If the sealing section is formed on a curved surface, then the battery can be curved, but the bonding process becomes complex and manufacturing precision decreases
Solution Approach 1:
The exterior packaging member is segmented so that the cup section can be curved while the sealing section remains flat. This segmentation allows the battery to achieve curved shapes without compromising the flatness required for precise sealing during manufacturing
Solution Approach 2:
The sealing section is prepared in advance with a flat surface before the curvature forming process. This preliminary preparation ensures that the sealing section maintains its flatness and dimensional accuracy, enabling precise bonding while the rest of the battery is shaped into a curved form
Data Source
AI summary
There is provided a pouch-type battery that includes an exterior packaging member having an accommodating space in which an electrode and an electrolyte are accommodated and which has a curved shape at least in a first direction. The exterior packaging member includes a first film member on which a cup section having the accommodating space inside is provided, a second film member disposed to face the first film member, and a sealing section around the cup section, with which the first and second film members are bonded to each other and the accommodating space is sealed. A top surface of the cup section of the first film member has a curved shape and is provided with a plurality of concave portions or convex portions, and the sealing section has a curved shape in the first direction and is configured of a flat surface on which neither concave portion nor convex portion is provided.