Pouch Battery Sealing Fold with Uniform Low-Pressure Heating

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Solution Overview

Problem

The existing methods for folding the sealing part of a pouch type secondary battery often damage the synthetic resin layer due to excessive pressure and struggle to maintain uniform temperature, leading to inconsistent sealing quality.

Innovation Solution

A method and apparatus that utilize a combination of non-contact and contact heating to fold the sealing part of a pouch type secondary battery, where infrared light from a heating lamp is used for non-contact heating and heated blocks are used for contact heating, allowing for uniform heating and reduced pressure on the sealing part.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heating blocks are used to heat the sealing part, then the sealing part can be heated, but excessive pressure is applied to the sealing part causing damage

Engineering Contradiction:

Improveheating temperatureVSAvoiddamage to sealing part

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

A release film is introduced as an intermediary layer between the heating block and the sealing part. The release film prevents direct contact between the heating block and the sealing part, thereby eliminating excessive pressure and damage to the sealing part while still allowing heat transfer to occur effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If heating blocks are used to heat the sealing part, then heating can be performed, but uniform temperature is difficult to maintain leading to inconsistent sealing quality

Engineering Contradiction:

Improvetemperature uniformityVSAvoidsealing quality consistency

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The release film serves as a thermal intermediary that distributes heat more uniformly across the sealing part surface. This intermediary layer ensures consistent temperature distribution during heating, resulting in uniform sealing quality without the temperature variations that occur with direct heating block contact.

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

This approach prevents damage to the sealing part by reducing pressure and ensures consistent sealing quality through uniform heating, improving the overall folding process of the pouch type secondary battery.

Implementation Method 1

heating the sealing part includes non-contact heating by emitting light onto the sealing part through a heating lamp to heat the sealing part

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Implementation Method 2

heated blocks are used for contact heating

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250201894A1Apparatus and method for folding sealing part of pouch type secondary battery

Publication Date: 2025.06.19 LG ENERGY SOLUTION LTD

AI summary

A method for folding a sealing part of a pouch type secondary battery in which the sealing part protrudes in a lateral direction of a pouch having an electrode assembly embedded therein and a folding apparatus are provided. The method includes heating the sealing part to form a heated sealing part, and folding the heated sealing part. The heating the sealing part includes non-contact heating by emitting light onto the sealing part through a heating lamp to heat the sealing part.