Battery Pack Venting Mesh for Particle Blocking and Pressure Relief
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Solution Overview
Problem
Conventional battery packs face safety issues due to external ignition phenomena caused by sparks, which can lead to explosions or damage from excessive internal pressure when particles are released through a mesh structure.
Innovation Solution
A battery pack design featuring a pack frame with a venting flow path and a filter mesh on its lower surface, which directs gas and flame discharge while restricting the release of high-temperature particles, thereby preventing external ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mesh is formed on the frame to minimize particle release, then external ignition is prevented, but internal gas release is limited causing rapid internal pressure increase
Solution Approach 1:
The venting flow path is divided into two functional zones: an upper region with a mesh structure for particle filtration and a lower region without mesh for unrestricted gas venting. This segmentation allows simultaneous achievement of particle containment and pressure relief through spatial separation of functions.
Solution Approach 2:
Different regions of the venting flow path are assigned different properties: the upper portion has mesh structure for particle blocking while the lower portion remains open for gas flow. This local differentiation enables the system to perform multiple functions (particle filtration and pressure relief) within a single component.
2Stress or pressure
If particles are released through the mesh structure, then internal pressure is relieved, but external ignition phenomena occur due to high-temperature particles
Solution Approach 1:
The mesh structure acts as an intermediary element that selectively permits gas molecules to pass through while blocking larger particle structures. This intermediary structure enables differential transmission based on particle size, allowing gas venting while preventing particle escape.
Solution Approach 2:
The mesh structure functions as a porous barrier with孔径 (pore sizes) designed to allow gas molecules to pass through while blocking larger particle structures. This porous configuration enables selective permeability based on the size difference between gas molecules and particles.
3Stress or pressure
If no mesh is used for gas venting, then internal pressure is relieved effectively, but high-temperature particles are discharged to the outside causing ignition
Solution Approach 1:
The venting flow path is divided into two functional zones: an upper region with a mesh structure for particle filtration and a lower region without mesh for unrestricted gas venting. This segmentation allows simultaneous achievement of particle containment and pressure relief through spatial separation of functions.
Solution Approach 2:
The solution adds a vertical dimension to the venting structure by creating a multi-level flow path where gas can move vertically through the mesh while particles are blocked. This dimensional approach allows the system to differentiate between gas and particle flow paths in three-dimensional space.
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 effectively prevents the propagation of ignition phenomena outside the battery pack by controlling gas and particle discharge, enhancing safety and durability.
Implementation Method 1
a filter mesh on a lower surface of the venting flow path
Data Source
AI summary
A battery pack includes a battery module including a plurality of battery cells, and a pack frame that houses the battery module. A venting flow path for discharging gas generated from the battery module is provided between the battery module and the pack frame. A filter mesh is formed on a lower surface of the venting flow path.