Pouch Battery Sleeve Wrapping for Pack Case Elimination
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Solution Overview
Problem
The conventional method of fabricating pouch type lithium secondary batteries requires a separate battery pack case, leading to a lengthy manufacturing process and limited cost reduction due to the need for additional components.
Innovation Solution
A pouch type lithium secondary battery design that incorporates a sleeve member wrapping the pouch bare cell, along with a protection circuit module and molding units formed by hot-melt resin, eliminating the need for a separate pack case and simplifying the packaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate battery pack case is used in conventional fabrication, then the battery structure is complete and protected, but the manufacturing process becomes lengthy and costs increase
Solution Approach 1:
The pouch exterior is integrated to perform multiple functions: it serves as both the battery container and the protective pack case. The pouch exterior includes a first side and a second side that are sealed to form a complete protective enclosure, eliminating the need for a separate battery pack case while maintaining structural completeness and protection.
Solution Approach 2:
The pouch exterior is designed as a multi-functional component that simultaneously provides containment for the electrode assembly, structural protection, and serves as the outer housing. This universal component replaces the traditional separate pack case, reducing manufacturing steps and improving productivity.
2Strength
If a separate battery pack case is used, then the battery has sufficient mechanical strength and protection, but manufacturing costs increase due to additional components
Solution Approach 1:
The pouch exterior is merged with the protective housing function, creating a single integrated structure. The first side and second side of the pouch exterior are sealed together to form a complete protective enclosure that replaces the traditional separate pack case, reducing component count while maintaining mechanical strength.
Solution Approach 2:
The pouch exterior utilizes composite material construction with multiple layers including aluminum foil and synthetic resin films. This composite structure provides enhanced mechanical strength and protection equivalent to separate metal can or rigid housing, while being integrated into the pouch structure itself.
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 approach reduces manufacturing time and costs by integrating the sleeve member and molding units directly onto the battery, while enhancing mechanical strength and safety through the use of metallic foils and reinforcing members.
Implementation Method 1
a pouch exterior for storing the electrode assembly; and a sleeve member winding around the pouch bare cell
Implementation Method 2
a sleeve member winding around the pouch bare cell. In one embodiment, the sleeve member is a metallic foil made of aluminum or steel-use stainless (SUS)
Data Source
AI summary
A pouch type lithium secondary battery includes a pouch bare cell having an electrode assembly and a pouch exterior for storing the electrode assembly and a sleeve member winding around the pouch bare cell. A method of fabricating a pouch type lithium secondary battery includes forming a pouch bare cell by storing an electrode assembly in a pouch exterior and wrapping the pouch bare cell with a sleeve member.