Battery Module Shock-Absorbing Fiber Structure for Short-Circuit Isolation

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Solution Overview

Problem

Existing battery modules are prone to external short circuits between battery cells due to physical impact, which can lead to fires or explosions.

Innovation Solution

Incorporation of shock-absorbing members made of aramid-based electrically insulative fibers between battery cells, featuring projecting or protruding wedge-shaped structures that penetrate between cells to prevent short circuits during deformation of end plates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If battery cells are arranged closely to increase capacity and output, then productivity and energy density are improved, but reliability deteriorates due to increased risk of external short circuit under physical impact

Engineering Contradiction:

Improvebattery capacityVSAvoidshort circuit prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a shock-absorbing member as an intermediary component positioned between adjacent battery cells. This member includes a base plate and multiple shock-absorbing protrusions that extend between the battery cells. When physical impact occurs, the protrusions deform to absorb shock energy while maintaining electrical insulation, thereby preventing external short circuits between closely arranged battery cells.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If rigid protection structures are added to prevent short circuits, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveshort circuit preventionVSAvoidmodule structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shock-absorbing member utilizes parameter changes in the form of deformable protrusions that change their physical state under impact. The protrusions are designed with specific geometric parameters (height, width, spacing) that allow them to deform elastically or plastically when subjected to physical impact, absorbing energy while maintaining their function as electrical insulators. This approach provides reliable protection without requiring complex active control systems or multiple rigid components.

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

Prevents external short circuits and minimizes cell deformation by allowing fibers to penetrate between cells, maintaining electrical isolation and structural integrity under impact.

Implementation Method 1

shock-absorbing member formed of a plurality of fibers inserted between a battery cell assembly and an end plate

Methodology Applied

Scientific EffectShock absorption: Damping

Implementation Method 2

Each of the fibers may be an aramid-based electrically insulative fiber

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Data Source

PatentEP3712981B1Battery module

Publication Date: 2025.10.22 LG ENERGY SOLUTION LTD

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AI summary

Disclosed is a battery module including a battery cell assembly constituted by stacking a plurality of battery cells, an end plate disposed adjacent to one end of the battery cell assembly, and a shock-absorbing member interposed between the one end of the battery cell assembly and the end plate, wherein the shock-absorbing member is woven fabric or non-woven fabric formed of a plurality of fibers.