Battery Rivet Vent Structure for Sealing and Pressure Relief
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Solution Overview
Problem
Secondary batteries face challenges in ensuring safe pressure regulation and gas venting mechanisms to prevent explosion, particularly during charging and discharging cycles.
Innovation Solution
A rivet with a vent recess is designed to fracture and allow gas discharge when internal pressure increases, combined with a sealing member to enhance sealing and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rivet is used to seal the electrolyte injection port, then sealing is achieved, but pressure relief capability is insufficient
Solution Approach 1:
The rivet is segmented into multiple functional zones: a sealing portion with increased thickness for reliable sealing, and a venting portion with reduced thickness for pressure relief. This segmentation allows the single rivet component to simultaneously provide both sealing and pressure venting functions, resolving the contradiction between sealing reliability and pressure relief capability.
Solution Approach 2:
Different portions of the rivet have different thickness characteristics: the sealing portion has increased thickness to enhance sealing reliability, while the venting portion has reduced thickness to enable fracture and gas discharge. This local quality variation allows each portion to optimize its specific function, resolving the contradiction between sealing and pressure relief.
2Ease of manufacture
If the rivet structure is simplified, then manufacturing is easier, but sealing force is insufficient
Solution Approach 1:
The rivet is pre-formed with a specific thickness distribution during manufacturing, with the sealing portion having increased thickness and the venting portion having reduced thickness. This preliminary action during manufacturing creates the necessary structural characteristics without requiring complex post-processing or assembly steps, thus maintaining ease of manufacture while ensuring adequate sealing force.
3Strength
If the rivet thickness is increased for better sealing, then sealing force improves, but pressure venting capability deteriorates
Solution Approach 1:
The rivet is divided into sealing and venting portions with different thickness characteristics. The sealing portion has increased thickness to provide strong sealing force, while the venting portion has reduced thickness to enable easy fracture and gas discharge. This segmentation resolves the contradiction by assigning different thickness requirements to different functional zones of the same component.
Solution Approach 2:
The rivet exhibits local quality variation in thickness: thicker at the sealing portion for strong sealing force, and thinner at the venting portion for effective gas discharge. This local differentiation allows the rivet to simultaneously satisfy both sealing strength requirements and pressure venting requirements without compromise.
4Reliability
If a sealing member is added to enhance sealing, then sealing reliability improves, but device complexity increases
Solution Approach 1:
The sealing function and pressure venting function are merged into a single integrated rivet component rather than using separate sealing elements and venting mechanisms. The rivet itself provides both sealing through its engaged portion and pressure relief through its venting portion, eliminating the need for additional sealing members and reducing overall device complexity while maintaining sealing reliability.
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 ensures safe operation by allowing controlled gas release while maintaining a secure seal, enhancing the safety of secondary batteries.
Implementation Method 1
a vent recess provided in a rivet is fractured if the internal pressure of a case increases, whereby internal gas is discharged
Implementation Method 2
sealing force is increased by a sealing member that is interposed between the rivet and the case
Data Source
AI summary
A secondary battery is configured such that a vent recess is provided in a rivet configured to seal an electrolyte injection port of a case and the vent recess is fractured if the internal pressure of the case increases, whereby internal gas is discharged, and therefore the secondary battery is made safer. The secondary battery includes an electrode assembly having a first electrode plate and a second electrode plate, a case in which the electrode assembly is received, and a rivet extending through a side of the case. The rivet includes vent recess, and a region of the rivet having the vent recess is thinner than other regions of the rivet.