Battery Module Side Support Structure for Cell Swelling Stability

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Solution Overview

Problem

Battery modules experience performance degradation and durability issues due to a swelling phenomenon during charging and discharging, leading to electrical disconnection and damage to electrode assemblies.

Innovation Solution

A battery module design featuring support portions on the left and right plates that protrude towards the cell assembly to uniformly pressurize and stabilize the cell assembly, combined with an adhesive for fixation and optional elastic pads or fluid-filled tubes to manage volume expansion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the cell assembly is fixed rigidly to the module housing, then the battery cells are stable during operation, but the battery case may be damaged due to swelling phenomenon during charging and discharging

Engineering Contradiction:

Improvestability of battery cellsVSAvoidbattery case damage

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The patent introduces a buffer member with elastic properties that can deform flexibly to accommodate the swelling and shrinking of the cell assembly during charging and discharging cycles. This elastic buffer member absorbs the expansion forces without transmitting damaging stresses to the battery case, while still maintaining the positional stability of the cell assembly.

Inventive Principle:

Principle #30Flexible shells and thin films

2Stability of the object's composition

If the middle part of the cell assembly is intensively pressurized by the module housing, then the cell assembly is constrained, but the electrode assembly inside the battery cell tends to be severely damaged

Engineering Contradiction:

Improveconstraint of cell assemblyVSAvoiddamage to electrode assembly

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent designs the buffer member with non-uniform elastic properties, making it softer in the middle region and stiffer at the edges. This local differentiation allows the middle part to yield and accommodate swelling without intensive pressurization, protecting the electrode assembly, while the stiffer edges maintain overall constraint and positional stability of the cell assembly.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the battery cells are not fixed, then the battery module structure is simple, but the battery cells may move and cause electrical disconnection due to swelling phenomenon

Engineering Contradiction:

Improvesimplicity of module structureVSAvoidelectrical connection stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a buffer member as an intermediary element between the cell assembly and the module housing. This buffer member serves as a mediator that maintains electrical connection stability by preventing excessive cell movement during swelling, while keeping the overall module structure simple and easy to manufacture.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Stability of the object's composition

If support portions are added to pressurize the cell assembly, then the cell assembly is stabilized during swelling, but the module housing structure becomes more complex

Engineering Contradiction:

Improvestability of cell assembly during swellingVSAvoidcomplexity of module housing structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent integrates the support portions directly into the module housing structure, merging the housing function with the support function. This eliminates the need for separate support components, thereby stabilizing the cell assembly during swelling while minimizing the increase in structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

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

Prevents performance deterioration and extends battery life by uniformly distributing pressure, preventing damage to the cell assembly and maintaining electrical connectivity.

Implementation Method 1

at least one of the left plate and the right plate includes a support portion having a shape protruding toward the cell assembly from an inner surface facing the plurality of battery cells

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP4679568A2Battery module, battery pack comprising same, and vehicle

Publication Date: 2026.01.14 LG ENERGY SOLUTION LTD

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AI summary

Provided is a battery module that prevents performance degradation due to a swelling phenomenon caused by charging and discharging and increases durability. The battery module includes a cell assembly comprising a plurality of battery cells stacked in a left-right direction; and a module housing configured to accommodate the cell assembly therein. The module housing includes an upper plate covering an upper portion of the cell assembly, a left plate covering a left portion of the cell assembly, a right plate covering a right portion of the cell assembly, and a lower plate covering a lower portion of the cell assembly, and at least one of the left plate and the right plate includes a support portion having a shape protruding toward the cell assembly from an inner surface facing the plurality of battery cells to pressurize at least a part of the cell assembly with a relatively small volume expansion.