Battery Partition Member Composition for Thermal Runaway Isolation

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Solution Overview

Problem

Existing partition members in secondary batteries fail to maintain adequate heat resistance and thermal insulation properties under pressure, particularly when multiple batteries are arranged in a stacked configuration, leading to potential chain reactions and safety hazards due to heat transfer.

Innovation Solution

A partition member composed of a combination of powdered and fibrous inorganic materials, with a density of 0.23 to 1.10 g/cm³, forming a porous body that maintains heat resistance and thermal insulation even under pressure, using materials like silica particles, alumina particles, calcium silicate, and glass fibers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional battery pack design is used, then the battery pack can be manufactured with standard components, but the battery pack cannot effectively accommodate battery modules with different dimensions and shapes, limiting adaptability

Engineering Contradiction:

Improveadaptability to different battery modulesVSAvoidpartition member structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The partition member is divided into a body portion and multiple extension portions that can independently adapt to different battery module configurations. The extension portions are segmented to fit between battery modules and the battery pack case, allowing the partition member to accommodate various module dimensions and shapes while maintaining structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The partition member is designed with multi-functional capability to serve as both a structural support element and an adaptive fitting component. The body portion provides primary structural support while the extension portions provide adaptive fitting to different battery module configurations, enabling a single component to handle multiple module types without requiring complete redesign.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the partition member has high flexibility to accommodate different modules, then adaptability improves, but manufacturing precision becomes more difficult to maintain

Engineering Contradiction:

Improveflexibility of partition memberVSAvoiddimensional accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Different portions of the partition member have different structural characteristics optimized for their specific functions. The body portion has a robust structure for structural support, while the extension portions have a more flexible structure for adaptation. This local differentiation allows the partition member to achieve both flexibility and manufacturing precision by optimizing each region for its specific requirement.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3719922B1Partition member and assembled battery

Publication Date: 2026.04.08 MITSUBISHI CHEM CORP

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AI summary

A partition member that forms a partition between single batteries or between a single battery and a member other than the single battery. The partition member contains a thermal insulation material that contains a powdered inorganic material and a fibrous inorganic material and that has a density of 0.23 to 1.10 g/cm3.