Heat Shrinkable Wrapping Layer for Battery Outer Case
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Solution Overview
Problem
Existing battery designs have insufficient dimensional space utilization, limiting the volumetric energy density and safety performance due to the use of multiple layers and tape/glue at the seal portion.
Innovation Solution
An electrochemical device with a first outer case wrapped in a heat shrinkable layer, eliminating the need for tape/glue at the seal portion, enhancing safety and space utilization by integrating a metal and fusion layer within a heat shrinkable second outer case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers and tape/glue are used at the seal portion, then safety and sealing are improved, but dimensional space utilization deteriorates
Solution Approach 1:
The patent combines multiple protective functions (sealing, safety, wrapping) into a single integrated heat shrinkable wrapping layer that encompasses the entire battery assembly, eliminating the need for separate tape and glue applications at the seal portion while maintaining comprehensive protection
Solution Approach 2:
The heat shrinkable wrapping layer acts as a flexible thin film that conforms to the battery shape, providing tight wrapping and secure fixation without adding rigid structural layers, thus maximizing space utilization while ensuring safety
2Reliability
If multiple layers and tape/glue are used at the seal portion, then sealing performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the sealing function with the outer wrapping layer, where the heat shrinkable material itself provides both the seal and the protective covering, eliminating the need for separate sealing components and simplifying the overall structure
Solution Approach 2:
The patent extracts the sealing function from the traditional multi-component seal structure (tape + glue + multiple layers) and integrates it into the heat shrinkable wrapping layer, which provides sealing through its thermal contraction properties alone
3Reliability
If traditional sealing methods with tape and glue are used, then sealing is achieved, but manufacturing time and cost increase
Solution Approach 1:
The patent removes the time-consuming steps of applying separate tape and glue from the manufacturing process, replacing them with a single heat treatment step that simultaneously achieves sealing and wrapping, thereby streamlining production
Solution Approach 2:
The patent replaces the mechanical application processes (tape application, glue spreading, drying) with a thermal process (heat treatment), which achieves the same sealing result more quickly and with fewer manual intervention steps
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
Improves dimensional space utilization and safety, increasing volumetric energy density while simplifying production and reducing costs by using a two-layer first outer case with a heat shrinkable second outer case for enhanced coverage and security.
Implementation Method 1
arranging the first outer case accommodating the electrode assembly therein in a second outer case for heat treatment, such that the second outer case is shrunk and attached to a surface of the first outer case
Data Source
AI summary
The present application relates to an electrochemical device and a method for manufacturing the same. The electrochemical device includes: a first outer case defining an accommodating chamber therein; an electrode assembly accommodated in the accommodating chamber of the first outer case; and a second outer case including a heat shrinkable wrapping layer, the first outer case being wrapped in the heat shrinkable wrapping layer.