Secondary Battery Port Structure for Confining Pressure Control
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Solution Overview
Problem
Existing secondary batteries face issues with pressure regulation due to oxygen or nitrogen entering the laminate exterior body, leading to insufficient confining pressure, which can result in increased internal pressure and potential damage.
Innovation Solution
A secondary battery design with a port portion that includes a valve or metal pipe configuration, allowing air to enter and exit the enclosed space, coupled with a method to measure internal pressure and issue warnings for depressurization when necessary, thereby maintaining a confining force within the laminate exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laminate exterior body is sealed to maintain confining pressure, then the confining force is maintained, but oxygen or nitrogen may enter due to aged deterioration, increasing internal pressure and reducing confining pressure
Solution Approach 1:
A port portion is introduced as an intermediary component between the enclosed space and the external environment. This port includes a valve mechanism that acts as a mediator to control gas exchange, allowing the system to actively manage internal pressure rather than passively relying on the integrity of the laminate exterior body alone.
Solution Approach 2:
The valve mechanism within the port portion enables the battery system to self-regulate its internal pressure. When pressure differential exceeds a threshold, the valve automatically opens to release excess pressure, and can close to maintain confining pressure, creating a self-service pressure management system without requiring external intervention.
2Reliability
If a port portion is added to regulate pressure, then internal pressure can be controlled, but the device complexity increases
Solution Approach 1:
The port portion is designed to perform multiple functions: it serves as a pressure relief valve, a sealing interface, and potentially a monitoring point. By integrating these functions into a single component rather than adding separate mechanisms for each function, the overall device complexity is minimized while achieving reliable pressure control.
Solution Approach 2:
The port portion utilizes the flexibility of the laminate exterior body to its advantage. The port is integrated into the flexible laminate structure, allowing the system to maintain its compact, flexible form factor while incorporating pressure regulation functionality. The flexible nature allows the port to respond to pressure changes without requiring rigid structural additions.
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 effectively reduces internal pressure by allowing controlled air flow, ensuring a confining force is maintained within the laminate exterior, preventing damage and enhancing sealability.
Implementation Method 1
a confining pressure can be applied to an electrode module inside the laminate exterior body due to the differential pressure between the pressure inside the laminate exterior body and the atmospheric pressure outside the laminate exterior body
Data Source
AI summary
A secondary battery includes an exterior member including laminate films, the exterior member having a peripheral edge sealed with the laminate films overlaid and having an enclosed space inside, an electrode module housed in the enclosed space, and a port portion configured to open and close the enclosed space. The port portion includes a seal portion having a peripheral edge sealed except a part and having a bag shape, and a metal pipe. The metal pipe has a first end portion that is disposed outside the seal portion and communicates with the enclosed space, and a second end portion that is disposed inside the seal portion and has an outer peripheral face at least partially fixed with second laminate films on the peripheral edge of the seal portion through a second sealant film.