Insulating Deforming Plate for Battery Current Interruption
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Solution Overview
Problem
Conventional current interruption devices in electric storage devices, such as lithium-ion batteries, face reliability issues due to deterioration of contact portions exposed to electrolytic solutions, which can lead to decreased performance and safety concerns when abnormal pressure conditions occur.
Innovation Solution
A current interruption device is designed with a deforming plate that isolates contact portions from the electrolytic solution, using a conducting plate and contact plate configuration where the deforming plate is insulated and acts to separate the contact portions when internal pressure rises, preventing arc effects and maintaining stability without weld strength influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact portions are exposed to electrolytic solution for current conduction, then electrical connectivity is maintained, but deterioration occurs leading to decreased reliability
Solution Approach 1:
A sealing plate is introduced as an intermediary component between the contact portion and the electrolytic solution. The sealing plate includes a through-hole that allows the contact portion to pass through while sealing the interface, preventing direct contact between the contact portion and electrolytic solution. This mediator protects the contact portion from deterioration while maintaining electrical connectivity through the through-hole structure.
Solution Approach 2:
The sealing plate functions as a thin film barrier that separates the contact portion from the electrolytic solution environment. This thin film structure allows electrical conduction through its opening while providing protective sealing against the harmful electrolytic solution, preventing corrosion and deterioration of the contact portion.
2Reliability
If current interruption device interrupts current path during abnormal pressure, then safety is improved, but arc generation may affect internal casing environment
Solution Approach 1:
The sealing plate serves as a protective barrier that isolates the internal casing environment from the arc generated during current interruption. When the current path is broken and an arc occurs, the sealing plate prevents the arc effects from contaminating or damaging the electrolytic solution and other internal components, thus maintaining the integrity of the internal environment while still providing safety through current interruption.
3Reliability
If deforming plate is made insulating to isolate contact portions, then deterioration is prevented, but current path interruption mechanism becomes more complex
Solution Approach 1:
The sealing plate performs multiple functions simultaneously: it provides electrical insulation to protect the contact portion from electrolytic solution, maintains structural integrity of the device, and enables the current interruption mechanism through its through-hole design. By combining these functions in a single component, the overall device complexity is minimized while achieving the desired reliability improvements.
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 enhances the safety and reliability of electric storage devices by preventing contact portion deterioration and ensuring stable operation even under abnormal pressure conditions, effectively interrupting current paths without affecting the internal casing environment.
Implementation Method 1
when an internal pressure of a casing rises above a predetermined level
Implementation Method 2
a deforming plate; a conducting plate which configures the current path; and a contact plate... The deforming plate is configured to deform when the internal pressure of the casing rises above the predetermined level
Implementation Method 3
the deforming plate is insulated from at least one of the conducting plate and the contact plate
Data Source
AI summary
A current interruption device includes: a deforming plate configured to deform when the internal pressure of the casing rises above the predetermined level; a conducting plate which configures the current path; and a contact plate. The conducting plate includes a first contact portion configured to contact the contact plate. The contact plate includes a second contact portion configured to contact the first contact portion. The deforming plate includes a pressure receiving portion configured to receive the internal pressure of the casing and a contacting portion configured to contact the first contact portion. The second contact portion is configured to be separated from the conducting plate by deformation causing the contacting portion to move toward the contact plate. The deforming plate is insulated from the conducting plate and the contact plate. The conducting plate is disposed to be interleaved between the deforming plate and the contact plate.