Pouch Battery Venting Assembly for Internal Gas Pressure Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type secondary batteries lack effective pressure regulation mechanisms, leading to potential damage and safety issues due to internal gas buildup, unlike can-type batteries which have protection members like safety vents.
Innovation Solution
A venting device is inserted into the sealing part of the pouch battery, comprising a metal housing, a polymer gasket, and a metal plate spring that opens and closes a passage to release internal gas, with a crimping mechanism for secure assembly, allowing for pressure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection member is provided in a pouch type secondary battery, then internal pressure can be regulated to prevent damage and safety issues, but the device complexity increases compared to conventional pouch batteries
Solution Approach 1:
The venting device is divided into separate functional components: a housing that provides structural support and sealing, a gasket that creates pressure-responsive sealing, and a plate spring that provides the opening force. This segmentation allows each component to be optimized independently while maintaining overall simplicity.
Solution Approach 2:
The venting device operates autonomously without external control systems. The plate spring automatically opens the passage when internal pressure exceeds the spring force, and automatically closes when pressure normalizes, providing self-regulating pressure protection.
2Reliability
If a venting device with multiple components (housing, gasket, plate spring) is used, then pressure regulation effectiveness is improved, but manufacturing time and cost increase
Solution Approach 1:
Multiple components are combined into a compact integrated assembly where the housing, gasket, and plate spring work together in a small volume. The crimping part integrates the sealing and mechanical retention functions, reducing the number of separate assembly operations.
Solution Approach 2:
The plate spring's physical parameters (thickness, length, material properties) are optimized to provide the required opening pressure within a specific range, allowing standard manufacturing processes to produce components with consistent performance characteristics.
3Reliability
If the venting device is designed with a crimping mechanism for secure assembly, then sealing reliability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The crimping mechanism replaces more complex mechanical fastening systems (such as threads, clips, or welds) with a simple deformation-based sealing approach. The crimping part is formed by pressing the housing material to deform and seal around the gasket, creating a reliable seal with minimal equipment.
4Adaptability or versatility
If the venting device is miniaturized to fit in pouch batteries, then adaptability to pouch battery design is improved, but manufacturing precision requirements increase
Solution Approach 1:
The gasket is formed as a thin, flexible polymer component that can be precisely stamped or molded to fit the compact housing. The flexibility of the thin film gasket allows it to conform to slight variations in assembly while maintaining sealing integrity, reducing the need for extremely tight manufacturing tolerances.
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 venting device effectively regulates internal pressure by releasing gas, enhancing safety and preventing damage to the battery, while being economically and quickly manufactured with a miniaturized design.
Implementation Method 1
the plate spring being configured to open and close the passage in response to a change in an internal pressure of the pouch
Implementation Method 2
a plate spring made of a metal, the plate spring being disposed in the housing and assembled with the gasket
Data Source
AI summary
A venting device inserted into a sealing part of a pouch of a secondary battery according to an embodiment of the present invention includes: a housing inserted between confronting surfaces of the sealing part so as to be sealed together with the sealing part, the housing being made from a metal plate; a gasket made of a polymer and disposed in the housing and through which a passage is defined providing gas communication between an inside and an outside of the pouch; and a plate spring made of a metal, the plate spring being disposed in the housing and assembled with the gasket, the plate spring being configured to open and close the passage in response to a change in an internal pressure of the pouch, wherein the housing includes a crimping part crimped together with the gasket on an upper end of the housing.