Pouch Battery Inward-Folded Sealing for Compact Thermal Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type secondary batteries face issues with reduced energy density due to protruding sealing parts, increased volume, and impaired heat dissipation.
Innovation Solution
The battery design incorporates folding parts that are folded inward to avoid protrusion from the electrode assembly, using an adhesive member to secure the folding parts to the case, thereby improving energy density and reducing volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing parts are formed by sealing the outermost portions of the case, then the battery is properly sealed and protected, but the total volume of the battery module increases and energy density decreases
Solution Approach 1:
The sealing parts are folded back along the outer periphery of the electrode assembly in a direction toward the inside of the case, transforming from a protruding three-dimensional structure to a folded configuration that reduces volume occupation. This dimensional transformation allows the sealing parts to maintain their sealing function while minimizing their contribution to the overall battery module volume.
Solution Approach 2:
The folded sealing parts are positioned to overlap with the case or electrode assembly, creating a nested configuration where the sealing parts are effectively contained within the boundary of the case rather than extending outward. This nesting approach allows the sealing parts to be integrated into the existing structure without increasing the external dimensions of the battery module.
2Reliability
If sealing parts surround outer peripheries of the electrode assembly, then the battery is properly sealed, but heat dissipation is inhibited
Solution Approach 1:
The sealing parts are folded back toward the inside of the case rather than extending outward, creating a configuration that reduces thermal resistance between the electrode assembly and the cooling plate. This dimensional change allows heat to dissipate more efficiently from the electrode assembly through the cooling plate without being blocked by protruding sealing parts.
3Volume of stationary object
If folding parts are folded inward to improve energy density, then volume is reduced, but the folding parts may detach or deform due to mechanical stress
Solution Approach 1:
An adhesive member is introduced as an intermediary substance between the folding parts and the case to provide mechanical bonding. This adhesive mediator allows the folding parts to be securely attached to the case, preventing detachment and deformation while maintaining the folded configuration that reduces battery module volume.
Solution Approach 2:
The folding parts are folded inward and secured with adhesive members before the battery assembly is completed. This preliminary action ensures that the folding parts are properly positioned and fixed in their folded state, preventing any subsequent detachment or deformation during battery operation or assembly processes.
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 enhances energy density by minimizing unnecessary volume and improves heat dissipation by reducing obstruction from sealing parts, while preventing fluttering and detachment of folding parts.
Implementation Method 1
an adhesive member to secure the folding parts to the case
Data Source
AI summary
An embodiment of the present invention relates to a pouch-type secondary battery. According to embodiment of the present invention, the pouch-type secondary battery includes: an case configured to house an electrode assembly from which electrode tab are drawn out; sealing parts formed by adhering the case along outer peripheries of the electrode assembly; and folding parts formed by folding the sealing parts of surfaces on which the electrode tab drawn to an outside of the case is not formed, wherein a length of the folding part has a relationship with a thickness of the electrode assembly as the following equation: H≤T/2 (wherein, H is the height of the folded folding part, T is the thickness of the electrode assembly, based on a cross-section perpendicular to a direction in which the electrode tabs of the electrode assembly are drawn out).