Battery Vent Plate Structure for Pressure Relief and Sealing
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Solution Overview
Problem
Secondary batteries can experience internal gas generation during charging and discharging, leading to deformation of the electrode assembly and potential short circuits, compromising safety.
Innovation Solution
A vent plate with a first vent member and a second vent member, where the second vent member is a thin film coupled to the first vent member and includes a rupture portion, designed to discharge internal gas when pressure increases, thereby serving as both a safety vent and seal for the electrolyte injection port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent plate with a thin film second vent member including a rupture portion is used, then internal gas can be discharged to prevent electrode assembly deformation and improve safety, but the structural complexity of the vent plate increases due to multiple vent members and their coupling
Solution Approach 1:
The vent plate is divided into multiple functional segments: a first vent member with a head portion and protrusion for sealing the electrolyte injection port, and a second vent member with a rupture portion for gas discharge. This segmentation allows each component to perform its specific function independently, achieving both safety through gas venting and proper sealing without requiring a single complex component.
Solution Approach 2:
The second vent member is coupled to the lower surface of the head portion of the first vent member, creating a nested structure where the thinner second vent member is positioned within the overall structure of the first vent member. This nesting arrangement reduces space requirements and integrates multiple functions into a compact configuration.
2Reliability
If the diameter of the head portion is greater than the diameter of the electrolyte injection port, then the seal is improved, but the amount of material required and the manufacturing complexity increase
Solution Approach 1:
The head portion of the first vent member is designed with a diameter greater than the electrolyte injection port to ensure proper sealing contact. This local enlargement is applied only where needed for sealing, while the rest of the vent plate structure maintains its original dimensions, optimizing both seal quality and material efficiency.
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 vent plate effectively discharges internal gas, preventing electrode assembly deformation and improving the safety of secondary batteries by managing pressure and preventing short circuits.
Implementation Method 1
the second vent member may include a rupture portion in at least a portion between the first region and the second region
Implementation Method 2
A vent plate with a first vent member and a second vent member, where the second vent member is a thin film coupled to the first vent member and includes a rupture portion, designed to discharge internal gas when pressure increases
Data Source
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AI summary
A vent plate includes a first vent member in an electrolyte injection port of a case of a secondary battery and a second vent member coupled to the first vent member. The first vent member includes a head portion on an outside of the case and a protrusion protruding from the head portion toward an inside of the case and in the electrolyte injection port.