Pouch Cell Case Structure for Low-Protrusion Cooling Contact
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Solution Overview
Problem
Pouch type secondary batteries face interference with cooling plates due to sealing protrusions, leading to reduced cooling efficiency and energy density, and the manufacturing process is inefficient, requiring frequent changes in battery size and design.
Innovation Solution
A pouch case design with adjustable sealing protrusions and a simplified forming process, featuring a forming portion with a notch portion and sealing connection, allows for tight attachment to a cooling plate, minimizing sealing protrusions and optimizing energy density while maintaining airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing protrusions are provided at vertices of the pouch case, then the electrode assembly is securely sealed, but interference occurs with the cooling plate, reducing cooling efficiency and energy density
Solution Approach 1:
The pouch case is designed with pre-formed receiving portions that accommodate the electrode assembly corners before sealing. This preliminary positioning action ensures the electrode assembly is securely held without requiring large sealing protrusions that would interfere with the cooling plate, thus resolving the contradiction between sealing reliability and cooling efficiency
Solution Approach 2:
The sealing protrusions are localized to specific positions at the vertices of the pouch case rather than being distributed across the entire sealing portion. This localized approach maintains adequate sealing reliability at critical corners while minimizing the overall interference with the cooling plate, thereby improving both cooling efficiency and energy density
2Manufacturing precision
If multiple metal dies are used for forming the pouch case at predetermined positions, then the electrode assembly is properly enclosed, but the manufacturing process becomes complex and productivity decreases
Solution Approach 1:
The pouch case is designed as an integrated structure where the receiving portion and sealing portion are formed as a single piece. This merging of functions allows the pouch case to be formed in a single manufacturing step rather than requiring multiple separate metal dies and sequential operations, thereby improving productivity while maintaining manufacturing precision
Solution Approach 2:
The receiving portion of the pouch case serves multiple functions: it accommodates the electrode assembly, positions it correctly, and integrates with the sealing portion. This multi-functionality eliminates the need for separate components and complex assembly steps, improving both manufacturing precision and productivity
3Adaptability or versatility
If the pouch case design is changed frequently to match electronic device development, then the battery adapts to new designs, but the detailed shapes of the receiving portion must be repeatedly modified, increasing manufacturing complexity
Solution Approach 1:
The pouch case is segmented into distinct functional portions: the receiving portion that accommodates the electrode assembly and the sealing portion that seals it. This segmentation allows the receiving portion to be independently modified to match different electronic device designs without affecting the sealing portion, thereby improving design adaptability while controlling manufacturing complexity
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 solution enhances cooling efficiency and energy density by reducing interference with cooling plates and streamlining the manufacturing process, allowing for more efficient production and adaptation to changing electronic device designs.
Implementation Method 1
an adhesive layer adhering the base layer and the metal layer
Implementation Method 2
a base layer formed of a heat-adhesive polyolefin-based resin to serve as a sealing material
Data Source
AI summary
Provided are a pouch case for a pouch type secondary battery in which one corner is in close contact with a cooling plate and a pouch type secondary battery including the same. In the pouch case, by controlling a shape relation among a forming portion formed to have a non-zero depth determined in advance at a center to accommodate one side of an electrode assembly, a receiving portion in surface contact with a side surface of the electrode assembly at the time of sealing the pouch case, and a sealing portion for sealing opposing ends of the forming portion and the electrode assembly, a size of a sealing protrusion formed after the electrode assembly is packaged through mechanical properties of a metal laminate sheet and a simplified die and punch may be minimized.