Current Interruption Device Gas Permeability Actuation
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Solution Overview
Problem
Current current interruption devices in electrical energy storage devices are less responsive when pressure in the casing does not properly increase during abnormalities, leading to failure in interrupting conduction between electrode terminals and electrodes.
Innovation Solution
The electrical energy storage device incorporates a current interruption device with a first and second conductive member, a first and second deformable member, and seal members, where the gas permeability between the casing and the first conductive member is equal to or less than the gas permeability between the first and second conductive members, ensuring that the second deformable member is actuated by pressure differences to reliably interrupt conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current interruption device relies on pressure increase in the casing to actuate the second deformable member, then the device structure is simple, but the responsiveness decreases when pressure does not properly increase during abnormalities
Solution Approach 1:
The patent introduces gas permeability as an intermediary mechanism between the casing interior and the current interruption device. By controlling the permeability of the first conductive member, gas can gradually pass through to actuate the second deformable member, providing a reliable trigger mechanism that works even when pressure does not sharply increase. This mediator approach ensures responsiveness without requiring complex pressure sensing systems.
Solution Approach 2:
The patent changes the parameter of gas permeability to control the actuation mechanism. By setting the gas permeability of the first conductive member to be greater than zero, gas can pass through gradually, creating a reliable trigger for the second deformable member. This parameter change allows the device to respond to abnormalities even without sharp pressure increases, improving responsiveness while maintaining structural simplicity.
2Reliability
If gas permeability between casing and first conductive member is high, then the second deformable member is reliably actuated, but gas leakage occurs reducing effectiveness
Solution Approach 1:
The patent applies local quality by differentiating the gas permeability characteristics at different locations. The first conductive member is designed with specific gas permeability properties to allow controlled gas passage, while other sealing locations maintain different permeability characteristics. This localized differentiation enables reliable actuation of the second deformable member while preventing harmful gas leakage to the exterior.
Solution Approach 2:
The patent utilizes porous material properties of the first conductive member to control gas flow. By selecting materials with appropriate porosity and permeability characteristics, gas can pass through in a controlled manner to actuate the second deformable member, while the structured porosity prevents uncontrolled gas leakage. This approach balances actuation reliability with gas containment.
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 configuration enhances the responsiveness of the current interruption device by preventing gas leakage and ensuring the device is actuated during abnormalities, effectively preventing current flow when internal pressure exceeds a predetermined value.
Implementation Method 1
the first deformable member is configured to be brought out of conduction with the second conductive member when the pressure in the casing exceeds the predetermined value
Implementation Method 2
the second deformable member is moved to a first conductive member side, and the second conductive member is broken off by the projection
Implementation Method 3
a first seal member is disposed between the first conductive member and the second conductive member such that an inside of the current interruption device is kept airtight against an outside of the current interruption device
Data Source
AI summary
A current interruption device includes a first conductive member, a second conductive member, a first deformable member, a second deformable member, and a first seal member. The second conductive member is disposed at a position opposed to the first conductive member. A center portion of the first deformable member is fixed to the second conductive member. The second deformable member is disposed on a side opposite to the first deformable member relative to the second conductive member. The first seal member is disposed between the first conductive member and the second conductive member. A second seal member is disposed between the first conductive member and the casing. A gas permeability between the casing and the first conductive member is equal to or less than a gas permeability between the first conductive member and the second conductive member.