Battery Sheath Radiation Layer Heat Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium polymer batteries face issues with poor heat radiation performance, mechanical strength, and reliability due to the use of materials like nylon and PET in their sheaths, which lead to reduced battery life and increased risk of swelling, fire, or explosion from heat generation and external impacts.
Innovation Solution
A battery sheath with a radiation layer that includes a metal layer, a thermally conductive radiation layer, and a cast polypropylene layer, enhancing heat dissipation, mechanical strength, and corrosion resistance, allowing the PTC device to quickly respond to temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible pouch made of nylon or PET is used as the battery sheath, then the battery can be manufactured in various shapes and mounted easily, but the heat radiation performance deteriorates and battery life is reduced
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different properties: a heat-resistant outer layer (nylon or PET) for mechanical strength and shape flexibility, a middle layer (aluminum foil or metallized film) for heat radiation, and an inner layer for ion conductivity. This composite structure resolves the contradiction by allowing the sheath to maintain both shape adaptability and improved heat radiation performance through the combined functions of different materials.
2Volume of moving object
If a flexible pouch is used as the battery sheath, then the thickness is reduced and battery capacity is increased, but the mechanical strength and resistance to external impact deteriorate
Solution Approach 1:
The patent uses composite materials to achieve both reduced thickness and improved mechanical strength. The multi-layer structure includes a heat-resistant outer layer providing mechanical strength and impact resistance, a thin middle layer for heat radiation, and an inner layer for ion conductivity. This composite approach allows the sheath to be thin enough to increase battery capacity while maintaining sufficient mechanical strength through the combined properties of different materials.
3Strength
If nylon or PET is used in the battery sheath, then the sheath provides mechanical strength, but the radiation performance deteriorates and heat generated during charging and discharging is not effectively dissipated
Solution Approach 1:
The patent applies composite materials by combining a heat-resistant outer layer (nylon or PET) for mechanical strength with a middle layer (aluminum foil or metallized film) specifically for heat radiation. This composite structure resolves the contradiction by assigning different functions to different layers: the outer layer maintains mechanical strength while the middle layer provides efficient heat dissipation, allowing both requirements to be satisfied simultaneously.
4Ease of manufacture
If the battery sheath comprises nylon or PET, then the sheath is easy to manufacture, but the PTC device response to temperature increases is delayed and battery reliability is decreased
Solution Approach 1:
The patent uses composite materials to resolve the contradiction between ease of manufacture and PTC device response speed. The multi-layer structure includes a heat-resistant outer layer (nylon or PET) that is easy to manufacture, a middle layer (aluminum foil or metallized film) for rapid heat conduction to the PTC device, and an inner layer for ion conductivity. This composite approach allows the sheath to remain easy to manufacture while the middle layer ensures rapid heat transfer to the PTC device for quick response and improved reliability.
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 improves heat radiation performance, mechanical strength, and reliability, extending battery life and preventing potential hazards by enabling effective heat transfer and quick temperature detection.
Implementation Method 1
the battery sheath comprises a radiation layer on its surface... pouch type battery sheaths do not radiate heat well... These materials decrease radiation performance
Implementation Method 2
A battery sheath with a radiation layer that includes a metal layer, a thermally conductive radiation layer... allowing the PTC device to quickly respond to temperature increases
Data Source
AI summary
A battery sheath having a radiation layer on its surface and a lithium polymer battery using the sheath are provided. The radiation layer improves radiation performance and mechanical strength of the battery, and also improves the response of a PTC device. The battery sheath comprises a metal layer having first and second surfaces, a radiation layer on the first surface of the metal layer, and a cast polypropylene (CPP) layer on the second surface of the metal layer. The lithium polymer battery has a PTC device electrically connected to a protective circuit module. The PTC device directly contacts the radiation layer of the battery sheath, thereby improving the response of the PTC device.