Pouch Battery Exterior Structure for Deep Cup Molding and Degassing
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Solution Overview
Problem
Existing technologies face challenges in manufacturing a pouch-type exterior, the technical problem is to provide a pouch-type battery, the technical problem is to provide a pouch-type battery capable of solving various problems occurring during the molding of a cup part for accommodating an electrode assembly, and preventing the exterior from being discarded after a degassing process.
Innovation Solution
A secondary battery design that includes an electrode assembly, an exterior film with an inner space, and a cover member that blocks the exterior opening, where the cover member consists of a first member and a second member coupled to the exterior film, allowing for increased battery capacity and preventing exterior discarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the pouch film is decreased during the molding of the cup part, then the exterior is more prone to defects such as cracks, but using a thicker film restricts design flexibility and increases material usage
Solution Approach 1:
The invention divides the exterior structure into two separate components: a pouch film and a cup part. The cup part is formed separately and then coupled to the pouch film, allowing each component to be optimized independently. This segmentation enables the pouch film to maintain appropriate thickness for reliability while the cup part provides the necessary structural depth for battery capacity, resolving the contradiction between defect prevention and design flexibility.
2Reliability
If a pocket part is added to collect gas during activation, then gas collection is improved, but the exterior must be discarded after the degassing process
Solution Approach 1:
The invention extracts the gas collection function from the main exterior structure by providing a separate communication path between the inner space and the external environment. This allows gas to be discharged without requiring a dedicated pocket part that would need to be removed, enabling the exterior to be retained and reused after degassing, thus eliminating material waste while maintaining gas collection capability.
3Ease of manufacture
If the cup part molding depth is limited by material characteristics, then manufacturing is simpler, but battery capacity cannot be increased sufficiently
Solution Approach 1:
By segmenting the exterior into a pouch film and a separate cup part, the invention allows the cup part to be designed with sufficient depth for increased battery capacity without being constrained by pouch film material characteristics. The cup part can be manufactured using processes suitable for achieving the required depth, while the pouch film maintains its manufacturing simplicity, thus resolving the contradiction between manufacturing ease and battery capacity.
Data Source
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AI summary
The present invention relates to a secondary battery including an electrode assembly, an exterior film having an inner space which accommodates the electrode assembly, and an exterior opening which allows the inner space to communicate with outside, and a cover member which covers the exterior opening of the exterior film, wherein the cover member includes a first member which blocks the exterior opening, and a second member which extends from the first member and is coupled to an inner surface of the exterior film.