Battery Module Cooling Fin Structure for Heat and Fire Isolation

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Solution Overview

Problem

Existing battery modules face challenges in effectively dissipating heat and preventing the propagation of fire or heat from one battery cell to adjacent cells, particularly in high-temperature environments, which can lead to accelerated deterioration and increased risk of explosion or ignition.

Innovation Solution

A battery module design featuring a cooling fin with a structured air layer between battery cells, comprising bent metal portions with protruding beads and flange surfaces, which facilitates heat dissipation while blocking fire propagation, and is integrated with a thermal conductive resin layer for enhanced heat transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a large number of battery cells are stacked to form a battery module, then capacity and output are improved, but heat dissipation becomes difficult and temperature rises excessively

Engineering Contradiction:

ImproveoutputVSAvoidheat dissipation

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

A cooling fin is introduced as an intermediary component between adjacent battery cells. The cooling fin includes a first portion facing a first battery cell and a second portion facing a second battery cell, with a space formed between the first and second portions. This intermediary structure facilitates heat transfer from the battery cells to the cooling fin, enabling effective heat dissipation while maintaining the high-density cell arrangement necessary for high output.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If battery cells are concentratedly arranged to increase vehicle mileage, then capacity is improved, but fire propagation risk increases

Engineering Contradiction:

Improvebattery cell densityVSAvoidfire propagation

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The cooling fin acts as a physical barrier and heat sink between adjacent battery cells. By positioning the cooling fin between the first and second battery cells, it serves as an intermediary that interrupts direct thermal and flame pathways, thereby preventing fire propagation while allowing the battery cells to be concentratedly arranged for increased capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The space formed between the first and second portions of the cooling fin creates an isolated environment between adjacent battery cells. This space acts as a thermal and chemical barrier, effectively creating an inert-like environment that prevents oxygen supply and heat transfer necessary for fire propagation, thereby enhancing safety in high-density arrangements.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Temperature

If cooling fins are placed between battery cells, then heat dissipation is improved, but device complexity increases

Engineering Contradiction:

Improvecooling performanceVSAvoidstructure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The cooling fin is designed to perform multiple functions simultaneously: it serves as a heat dissipation component by contacting the battery cells, acts as a fire barrier by positioning between adjacent cells, and creates an isolated space for enhanced safety. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving superior cooling and safety performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 effectively dissipates heat and delays fire propagation, improving safety and durability by providing a time margin for evacuation and maintaining heat transfer efficiency.

Implementation Method 1

a space is formed between the first portion and the second portion... maintaining a space between the first and second portions, thereby fire or heat generated from any one of the battery cells can be blocked

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

a cooling fin between the plurality of battery cells... facilitates heat dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12620649B2Battery module and manufacturing method of the same

Publication Date: 2026.05.05 LG ENERGY SOLUTION LTD

AI summary

A battery module includes a battery cell stack. The battery cell stack includes a plurality of battery cells and a cooling fin between the plurality of battery cells. The cooling fin includes a first portion facing a first one of the plurality of battery cells and a second portion facing a second one of the plurality of battery cells. A space is formed between the first portion and the second portion.