Independent Coupling Frame for Pouch Battery Strength
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Solution Overview
Problem
Conventional pouch-shaped batteries face issues with mechanical strength and sealability due to repetitive expansion and contraction during charge and discharge, leading to potential separation of sealing regions and increased internal resistance when stacked in large-sized modules, which complicates assembly and increases weight and size.
Innovation Solution
A secondary battery with an independent coupling type frame structure mounted outside a laminated sheet battery case, featuring separate frame members for enhanced mechanical strength and sealability, allowing for compact, lightweight, and simplified assembly of medium- or large-sized battery modules without additional mounting members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pouch-shaped battery with laminated sheet sheathing member is used, then weight to capacity ratio is reduced, but mechanical strength and sealability deteriorate due to repetitive expansion and contraction
Solution Approach 1:
The frame member is divided into multiple independent coupling sections, each separately coupled to the sheathing member at different locations. This segmentation allows localized reinforcement without adding overall weight, and enables independent deformation of each section to accommodate battery expansion/contraction while maintaining overall structural integrity and sealability.
Solution Approach 2:
The frame member is constructed from a material that combines high mechanical strength with appropriate flexibility, creating a composite structure that reinforces the laminated sheet sheathing member. This composite approach maintains the lightweight advantage of the pouch battery while providing the necessary mechanical strength and sealability resistance against repetitive expansion and contraction.
2Strength
If additional mounting members are used to improve mechanical strength, then device complexity and assembly process are increased
Solution Approach 1:
The frame member integrates multiple functions into a single component: it provides mechanical strength reinforcement, ensures sealability at the sheathing member, and serves as a mounting structure for battery module assembly. This merging eliminates the need for separate mounting members and simplifies the assembly process, as the frame member is directly coupled to the sheathing member at multiple points.
Solution Approach 2:
The frame member is designed as a universal component that simultaneously performs structural support, sealing reinforcement, and electrical connection functions. By making the frame member multi-functional, the invention reduces the number of separate components needed, thereby reducing device complexity and simplifying assembly while maintaining improved mechanical strength.
3Power
If battery cells are stacked to form large-sized modules, then output and capacity are increased, but internal resistance increases and assembly becomes complicated
Solution Approach 1:
Instead of simply stacking battery cells in a vertical arrangement that increases internal resistance, the frame member creates a three-dimensional structural framework that allows for optimized spatial arrangement of cells. This dimensional approach enables better electrical connection pathways and reduces internal resistance while maintaining high output and capacity in the battery module.
Data Source
AI summary
The present invention is a secondary battery, which is formed in the shape of a plate and has an electrode assembly mounted in a battery case made of a laminated sheet including a metal layer and a resin layer, wherein the secondary battery is constructed in a structure in which independent coupling type frame members are mounted to the outside part of a sheathing member serving as the battery case, and a medium- or large-sized battery module including the same as a unit cell.