Pack Housing Reinforcing Beads Prevent Bending

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Solution Overview

Problem

Existing secondary battery packs lack sufficient mechanical robustness and reliability, particularly in thermal runaway events, which pose safety risks.

Innovation Solution

A pack housing design featuring a center plate, side plates with reinforcing beads, and side walls, manufactured through extrusion and welding, with reinforcing structures to prevent bending during assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pack housing components are welded together without reinforcing structures, then the manufacturing process is simpler and faster, but the mechanical robustness and reliability are insufficient, causing bending during welding

Engineering Contradiction:

Improvemechanical robustnessVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Reinforcing beads are pre-formed on the side plates and center plate before the welding process. These reinforcing structures are created during the extrusion process, so the reinforcement is already in place before welding begins, preventing bending during the welding operation without adding separate reinforcement steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reinforcing structures are integrated into the main body of the side plates and center plate as a unified extruded component. The reinforcing beads are formed as part of the same extrusion process that creates the plate structures, merging the reinforcement function with the structural components rather than adding separate reinforcement elements

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If reinforcing beads are added to the side plates, then the resistance to bending during welding is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveresistance to bendingVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The reinforcing beads are formed as an integral part of the side plates during the extrusion process. The same extrusion die that forms the plate geometry also creates the reinforcing beads, so no separate manufacturing step is required for the reinforcement structures

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The extrusion process parameters are optimized to simultaneously create both the plate structures and the reinforcing beads in a single operation. By adjusting the die geometry and extrusion conditions, the reinforcing features are formed with the same material flow that creates the main plate bodies

Inventive Principle:

Principle #35Parameter changes

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 enhances mechanical robustness and reliability by preventing bending of the center and side plates during welding, improving safety and energy density.

Implementation Method 1

extruding a center plate, side plates, and side walls

Methodology Applied

Scientific EffectExtrusion: Extrusion

Implementation Method 2

welding the center plate, the side plates, and the side walls together

Methodology Applied

Scientific EffectWelding: Welding

Data Source

PatentEP4632897A1Pack housing and manufacturing method thereof

Publication Date: 2025.10.15 LG ENERGY SOLUTION LTD

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AI summary

Example embodiments provide a pack housing. The pack housing includes a center plate, side plates coupled to the center plate, and side beams coupled to the side plates, in which each of the side plates includes a reinforcing bead extending in a first direction, and the first direction is parallel to a mounting surface of each of the side plates.