Ceramic Heat-Dissipating Battery Pouch Against Lithium Plating

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Solution Overview

Problem

Conventional secondary batteries face issues with lithium plating when over-voltage occurs at low temperatures, leading to increased electrode assembly thickness, deteriorated assembly quality, and reduced energy efficiency.

Innovation Solution

A pouch for secondary batteries is designed with a surface protection layer, a sealant layer, a gas barrier layer made of metal, and a heat dissipation layer made of ceramic containing lambda trititanium pentoxide, which releases heat when pressure is applied, preventing lithium plating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pouch structure is used, then manufacturing simplicity is maintained, but lithium plating occurs at low temperature over-voltage conditions

Engineering Contradiction:

Improveprevention of lithium platingVSAvoidpouch structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pouch is divided into multiple functional layers: surface protection layer, gas barrier layer, heat dissipation layer, and sealant layer. Each layer performs a specific function, with the heat dissipation layer containing ceramic particles that activate under pressure to prevent lithium plating during over-voltage conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pouch uses composite material structure combining polymer materials (PET, nylon, PPa, CPP) with ceramic particles (lambda trititanium pentoxide). The composite structure integrates thermal dissipation functionality into the pouch itself, enabling passive safety mechanisms without external systems.

Inventive Principle:

Principle #40Composite materials

2Reliability

If heat dissipation layer with ceramic is added, then lithium plating is prevented, but manufacturing complexity increases

Engineering Contradiction:

Improvebattery safety under over-voltageVSAvoidpouch manufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The heat dissipation function is merged into the pouch structure itself by incorporating ceramic particles into the heat dissipation layer. This integration eliminates the need for separate thermal management systems and allows the pouch to passively respond to over-voltage conditions through pressure-activated heat release.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pouch structure provides self-protection against lithium plating through the heat dissipation layer. When over-voltage occurs and pressure increases, the ceramic particles automatically convert from lambda to beta phase, releasing heat to prevent lithium plating without requiring external control systems.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If multiple layers are stacked, then functionality is improved, but assembly complexity increases

Engineering Contradiction:

Improvepouch functionalityVSAvoidlayer stacking structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The multi-layer pouch structure provides multiple functions within a single integrated component: surface protection, gas barrier, heat dissipation, and sealing. This universal design allows the pouch to handle various operational conditions including over-voltage, temperature variations, and mechanical stress without requiring additional external components.

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 pouch effectively prevents lithium plating even under over-voltage conditions at low temperatures, thereby maintaining battery thickness, assembly quality, and energy efficiency.

Implementation Method 1

the ceramic may be converted into beta trititanium pentoxide when a pressure greater than 60 MPa is applied

Methodology Applied

Scientific EffectPressure-induced phase transition: Phase Change

Implementation Method 2

a heat dissipation layer made of ceramic, stacked between the surface protection layer and the sealant layer, and releasing heat to the outside when a specific pressure is applied thereto

Methodology Applied

Scientific EffectHeat release upon compression: Mechanocaloric Effect

Implementation Method 3

a gas barrier layer made of a metal and stacked between the surface protection layer and the sealant layer

Methodology Applied

Scientific EffectGas barrier property of metal: Permeation

Data Source

PatentUS12206119B2Pouch for secondary battery and pouch type secondary battery

Publication Date: 2025.01.21 LG ENERGY SOLUTION LTD

AI summary

A pouch for a secondary battery according to an embodiment of the present invention for solving the above problem includes: a surface protection layer made of a first polymer and formed at the outermost layer; a sealant layer made of a second polymer and formed at the innermost layer; a gas barrier layer made of a metal and stacked between the surface protection layer and the sealant layer; and a heat dissipation layer made of ceramic, stacked between the surface protection layer and the sealant layer, and configured to release heat to the outside of the pouch when a predetermined pressure is applied thereto.