Battery Packaging Valve Layout for Heat-Sealed Venting
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Solution Overview
Problem
Existing methods for attaching a one-way exhaust valve to a battery enclosure can cause the valve mechanism to break due to heat and pressure during the heat sealing process.
Innovation Solution
A battery design with a housing body composed of laminated layers, where the valve device's first portion is not sandwiched between heat-sealable resin layers, and a second portion is sandwiched between these layers, allowing for reduced heat and pressure application during sealing, thus preventing valve mechanism breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the one-way exhaust valve is attached to the enclosing bag through heat sealing, then the valve device is securely fixed to the housing body, but the valve mechanism may break due to heat and pressure applied during the heat sealing process
Solution Approach 1:
The valve device is divided into two distinct portions: a first portion (valve body) that remains outside the heat-sealable resin layers to avoid damage, and a second portion (sealing portion) that is sandwiched between the layers for secure attachment. This segmentation allows different parts of the valve device to be positioned in zones with different thermal and mechanical stress conditions during heat sealing.
Solution Approach 2:
The second portion of the valve device acts as an intermediary element that is specifically designed to be sandwiched between the heat-sealable resin layers. This intermediary portion serves as the interface for heat sealing attachment while protecting the sensitive valve mechanism in the first portion from direct exposure to heat and pressure during the sealing process.
2Strength
If the valve device is attached through heat sealing, then secure fixation is achieved, but excessive heat and pressure may reduce sealing strength and insulating performance of the housing body
Solution Approach 1:
The heat sealing process is localized to only the second portion of the valve device, which is sandwiched between the heat-sealable resin layers. The first portion containing the valve mechanism is deliberately positioned outside this localized heat treatment zone, receiving minimal or no heat exposure. This local quality approach ensures that heat and pressure are applied only where needed for attachment, while protecting other areas from thermal and mechanical damage.
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 design prevents valve mechanism breakage during sealing, maintains sealing strength and insulating performance, and effectively discharges gas while minimizing housing deformation.
Implementation Method 1
the mutually facing heat-sealable resin layers are fused together
Implementation Method 2
a large pressure and a large amount of heat are not applied to the first portion, when compared to the second portion, when the mutually facing heat-sealable resin layers are fused
Data Source
AI summary
A battery includes a battery element, housing body, and valve device. The housing body has a laminate including a base material, barrier, and heat-sealable resin layers. The valve device is in communication with the housing body inside. A joined edge portion in which the mutually facing heat-sealable resin layers are fused together is formed in a housing body peripheral edge portion. The valve device includes first and second portions. A valve mechanism reduces the housing body internal pressure if it is increased due to gas generated in the housing body is formed in the first portion. An air passage guides gas generated in the housing body toward the valve mechanism is formed in the second portion. The first portion is located on a joined edge portion edge outer side. At least a portion of the second portion is sandwiched between the heat-sealable resin layers in the joined edge portion.