Battery Pack Venting Mesh to Block Flame Exposure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packs face issues with flames or ignitable particles being exposed to the outside during thermal events, leading to potential fire spread and increased thermal runaway propagation, necessitating a solution that prevents external exposure while smoothly discharging venting gas.
Innovation Solution
A battery pack design incorporating a composite blocking member that includes a mesh member and blocking walls to filter flames and allow gas passage, with a coating layer for fire resistance, positioned to cover the venting unit and securely fastened to the pack case, ensuring efficient discharge of venting gas and blocking flames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting unit is provided in the pack case to discharge venting gas, then venting gas can be discharged to the outside, but flames or ignitable particles may be exposed to the outside through the venting unit
Solution Approach 1:
The patent employs a mesh member with porous structure that allows venting gas to pass through while blocking flames and ignitable particles. The mesh member's porous configuration enables selective permeation based on particle size, permitting gas molecules to escape while trapping larger combustion byproducts.
Solution Approach 2:
The patent utilizes a composite blocking member comprising multiple materials with different properties: a mesh member for filtration, a blocking wall for structural support and flame blocking, and a fire-resistant coating layer for thermal protection. This composite structure achieves both venting function and flame prevention.
2Stress or pressure
If the venting unit is opened to discharge gas, then internal pressure is reduced, but thermal runaway propagation may increase due to flame spread
Solution Approach 1:
The mesh member's porous structure provides pressure relief by allowing gas to escape while simultaneously preventing flame propagation. The porous configuration creates a physical barrier that disrupts flame continuity while maintaining pressure equilibrium.
Solution Approach 2:
The composite blocking member acts as an intermediary element between the internal battery environment and the external atmosphere. It mediates the pressure release process by selectively allowing gas passage while blocking harmful combustion products, thus preventing thermal runaway propagation.
3Object-affected harmful factors
If a composite blocking member is added to cover the venting unit, then flame exposure is prevented, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single composite blocking member component: the mesh member for filtration, the blocking wall for structural support, and the fire-resistant coating for thermal protection. This integration reduces the number of separate parts while achieving multiple protective functions.
Solution Approach 2:
By using composite materials with multifunctional properties, the patent reduces overall device complexity. The fire-resistant coating layer provides both thermal protection and structural reinforcement, while the mesh member combines filtration and flame-blocking functions in a single element.
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 flames from escaping the battery pack, ensuring safety and reliability by suppressing thermal runaway propagation and allowing timely discharge of venting gas, thereby preventing further thermal damage and chain ignition.
Implementation Method 1
a mesh member configured to filter flames and allow the venting gas to pass through
Implementation Method 2
a coating layer configured to cover the blocking wall and having fire resistance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A battery pack according to an embodiment of the present disclosure includes: a plurality of battery cells; a pack case configured to accommodate the plurality of battery cells and having a venting unit configured to discharge gas generated from the battery cells to the outside; and a composite blocking member configured to cover at least a portion of the venting unit and block flame generated inside the pack case from being exposed to the outside.