Battery Module Venting Structure to Block Reverse Flame Inflow

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Solution Overview

Problem

Existing battery modules and packs face issues with high-temperature discharged matter flowing reversely and propagating between modules, leading to thermal runaway and potential explosions, which can endanger drivers and damage equipment.

Innovation Solution

A battery module with a reverse inflow prevention member that includes a movement hole and inclined portion to redirect discharged matter away from the module case, coupled with a venting system to discharge gas in a controlled direction, preventing flame propagation and suppressing thermal runaway.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a discharge hole is formed in the module case to discharge gas, then gas discharge capability is improved, but high-temperature discharged matter can flow reversely into the module case and propagate to other modules

Engineering Contradiction:

Improvegas discharge capabilityVSAvoidreverse flow of high-temperature discharged matter

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A reverse inflow prevention member is introduced as an intermediary component between the discharge hole and the external environment. This member includes a movement hole that allows gas to pass through and an inclined portion that redirects high-temperature discharged matter away from the module case, thus mediating between the need for gas discharge and the need to prevent harmful reverse flow

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The reverse inflow prevention member changes the dimensional trajectory of discharged matter by introducing an inclined portion. Instead of allowing linear reverse flow through the discharge hole, the inclined portion redirects the flow in a different direction (at an angle), effectively using dimensional change to prevent harmful reverse inflow while maintaining gas discharge capability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If the module case structure is simplified, then manufacturing ease is improved, but the ability to prevent thermal runaway and flame propagation is reduced

Engineering Contradiction:

Improvemodule case structureVSAvoidthermal runaway prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The reverse inflow prevention function is segmented from the main module case structure into a separate, independent reverse inflow prevention member. This segmentation allows the module case to remain simple and easy to manufacture, while the added prevention member provides the necessary thermal runaway protection without complicating the base structure

Inventive Principle:

Principle #1Segmentation

3Stress or pressure

If gas discharge is allowed without direction control, then pressure release is improved, but flame propagation to other modules cannot be prevented

Engineering Contradiction:

Improveinternal pressure reliefVSAvoidflame propagation

Core Design Contradiction:

Stress or pressureVSObject-generated harmful factors

Solution Approach 1:

The reverse inflow prevention member acts as a mediator between the internal pressure relief requirement and the flame propagation prevention requirement. The movement hole allows pressure relief through gas discharge, while the inclined portion simultaneously serves as a barrier that redirects flame and hot discharged matter away from other modules, thus mediating between these two conflicting requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Prevents reverse flow and propagation of high-temperature discharged matter, blocks flames, and directs gas discharge, thereby enhancing safety by preventing thermal runaway and maintaining module stability.

Implementation Method 1

an inclined portion formed to prevent reverse inflow of the discharged matter that has moved through the movement hole

Methodology Applied

Scientific EffectFluid flow redirection:

Implementation Method 2

a venting system to discharge gas in a controlled direction, preventing flame propagation and suppressing thermal runaway

Methodology Applied

Scientific EffectPressure-driven gas flow: Pressure Gradient

Data Source

PatentEP4668452A1Battery module, and battery pack and vehicle including same

Publication Date: 2025.12.24 LG ENERGY SOLUTION LTD

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AI summary

Disclosed is a battery module, and a battery pack and a vehicle including the same. The battery module includes a battery cell stack in which a plurality of battery cells are stacked; a module case configured to accommodate the battery cell stack and having a discharge hole formed to discharge gas; and a reverse inflow prevention member coupled to the module case and configured to prevent discharged matter generated from the battery cell from flowing out of the module case and then reversely flowing into the module case.