Battery Smoke Exhaust Valve Layout Against Bottom Impact Damage

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Solution Overview

Problem

The smoke exhaust valve in a battery case is prone to damage upon impact from below, as it is often positioned level with or below the lower surface of the power storage cell.

Innovation Solution

The smoke exhaust valve is positioned on a protruding portion or side wall above the lower surface of the power storage cell, with the bottom portion of the lower case disposed below it, thereby preventing impacts from below and being supported by the protrusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the smoke exhaust valve is positioned level with or below the lower surface of the power storage cell, then the device complexity is reduced, but the reliability deteriorates due to damage from impacts

Engineering Contradiction:

Improvestructural complexityVSAvoidsmoke exhaust valve durability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The smoke exhaust valve is repositioned from a horizontal alignment with the lower surface to a vertical arrangement on the side wall portion, utilizing the vertical dimension to achieve both protection and functionality

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The protruding portion is designed in advance to provide a protective barrier against impacts before they can reach the smoke exhaust valve, preventing damage before it occurs

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the smoke exhaust valve is positioned above the lower surface on the side wall portion, then the reliability improves by preventing impact damage, but the device complexity increases

Engineering Contradiction:

Improvesmoke exhaust valve durabilityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The smoke exhaust valve is integrated with the side wall portion of the housing, combining the protective structure and the exhaust function into a single unified component rather than separate elements

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The side wall portion serves multiple functions: it provides structural support for the housing, contains the smoke exhaust valve, and acts as a protective barrier against impacts from below

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4664628A1Power storage device

Publication Date: 2025.12.17 TOYOTA JIDOSHA KK

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AI summary

In a power storage device (100), a smoke exhaust valve (1) is disposed in a smoke exhaust space (S20) through which gas discharged from a gas exhaust valve (SV) of a power storage cell (10) flows. A housing (20) includes a bottom portion (21g), a side wall portion (21c) extending upward from an outer peripheral edge of the bottom portion (21g), and a protruding portion (21f) protruding from the side wall portion (21c). The smoke exhaust valve (1) is provided in the protruding portion (21f) and is disposed above a lower surface (11) of the power storage cell (10).