Pouch Battery Casing Split Structure for Lead Groove Sealing

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Solution Overview

Problem

The existing deep drawing method for manufacturing pouch-shaped battery casings is limited by material elongation, leading to edge cracks and unfused portions at electrode leads, compromising sealing and safety due to the complexity of forming a single receiving part for electrode assemblies with intricate structures.

Innovation Solution

Dividing the battery casing into two casings with different sizes or shapes and incorporating electrode lead grooves to accommodate electrode leads, allowing for easier formation and enhanced sealing through thermal fusion, while reducing defects and improving safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a single receiving part is formed using the deep drawing method to accommodate complex electrode assemblies, then the battery casing can be manufactured in one piece, but edge cracks occur due to material elongation limits

Engineering Contradiction:

Improvebattery casing formationVSAvoidedge crack prevention

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The battery casing is divided into a first casing and a second casing, each with its own receiving part. This segmentation allows each casing to be formed independently using the deep drawing method without excessive material elongation, preventing edge cracks while maintaining manufacturing efficiency.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the battery casing is formed as a single unit, then production efficiency is maintained, but unfused portions occur at electrode leads compromising sealing

Engineering Contradiction:

Improvebattery casing production efficiencyVSAvoidsealing quality at electrode leads

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Dividing the battery casing into two separate casings allows the electrode leads to be positioned between the casings, eliminating the problem of unfused portions at the leads. Each casing can be thermally fused independently to ensure complete sealing without compromising production efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode leads act as intermediaries positioned between the first and second casings. This arrangement allows the leads to be naturally incorporated into the sealing process without requiring direct fusion at the lead positions, ensuring both sealing quality and production efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the receiving part structure is made complex to match intricate electrode assemblies, then proper accommodation is achieved, but the forming process becomes difficult and defects increase

Engineering Contradiction:

Improveelectrode assembly accommodationVSAvoidreceiving part formation

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The receiving part is divided into a first receiving part and a second receiving part, each with simpler geometries that are easier to form using deep drawing. This segmentation maintains the ability to accommodate complex electrode assemblies while significantly improving manufacturability and reducing forming defects.

Inventive Principle:

Principle #1Segmentation

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 simplifies the formation process, reduces defects, and enhances safety by preventing unfused portions at electrode leads, ensuring effective sealing and structural stability of the battery casing.

Implementation Method 1

the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings

Methodology Applied

Scientific EffectThermal fusion: Melting

Data Source

PatentUS11855296B2Battery cell having battery casing with receiving part and electrode lead groove

Publication Date: 2023.12.26 LG ENERGY SOLUTION LTD

AI summary

Disclosed in a battery cell including: an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes, with electrode tabs protruding from at least one side of outside peripheral portions of the electrode assembly; and a battery casing including first and second casings provided with first and second receiving parts, respectively, the first and second receiving parts respectively accommodating the electrode assemblies and having different sizes or shapes, wherein in a state in which electrode leads connected to the electrode tabs protrude from outside peripheral portions of the first and second casings, the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings, wherein electrode lead grooves recessed downwardly such that the electrode leads are seated therein are provided at a portion of the outside peripheral portions of the first and second casings.