Closed Battery Housing Profile With Integrated Burst Venting

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Solution Overview

Problem

Existing methods for producing closed profiles with integrated pressure relief valves for electrical cells are costly and inefficient, often requiring additional components like separate pressure relief valves and complex manufacturing steps.

Innovation Solution

A profiling system that integrates a predetermined rupture point into a metal strip, which acts as a pressure relief valve, allowing gas to escape when pressure exceeds a burst point, using embossing, punching, and joining processes to create a continuous manufacturing process for closed profiles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate pressure relief valve is installed in the housing, then gas pressure relief is achieved, but manufacturing costs and process complexity increase

Engineering Contradiction:

Improvepressure relief functionVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pressure relief function is merged into the closed profile itself by creating an integrated rupture metal strip within the profile structure. The rupture metal strip is formed as part of the continuous profiling process, combining the structural function of the profile with the pressure relief function, thereby eliminating the need for separate pressure relief valve components and their associated installation processes

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The closed profile is designed to serve multiple functions simultaneously: it provides structural support for the housing and integrates a pressure relief function through the embedded rupture metal strip. This multi-functionality is achieved by incorporating the rupture metal strip with varying thickness into the profile manufacturing process, allowing the same component to fulfill both structural and safety functions

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate pressure relief valve is installed in the housing, then gas pressure relief is achieved, but manufacturing costs increase

Engineering Contradiction:

Improvepressure relief functionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The closed profile with integrated rupture metal strip is self-sufficient in providing pressure relief functionality. The rupture metal strip is designed with specific thickness variations that enable it to automatically rupture at predetermined pressure points without requiring external valves or additional components, making the system self-service capable

Inventive Principle:

Principle #25Self-service

3Productivity

If the profile is continuously roll-formed and edges are joined, then production efficiency is improved, but integrating a pressure relief valve becomes more difficult

Engineering Contradiction:

Improveproduction speedVSAvoidpressure relief valve integration

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The rupture metal strip is prepared in advance with predetermined thickness variations during the continuous profiling process. The embossing of the rupture point is performed as a preliminary action during the continuous manufacturing process, allowing the pressure relief function to be integrated without interrupting the continuous production flow

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pressure relief function is integrated into the continuous profiling process itself. The rupture metal strip is formed and positioned within the profile during the continuous roll-forming operation, maintaining uninterrupted production flow while embedding the pressure relief capability throughout the manufacturing process

Inventive Principle:

Principle #20Continuity of useful action

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 method provides a cost-effective and efficient production of closed profiles with integrated pressure relief valves, enabling faster and more reliable gas release without additional components, reducing manufacturing costs and improving safety.

Implementation Method 1

the embossing device (4) imprints a predetermined rupture point (26) into a metal strip (22) for forced venting at a burst pressure

Methodology Applied

Scientific EffectEmbossing:

Implementation Method 2

the profiling device (10) roll-forms the profiled metal strip (22) into a profile (2)

Methodology Applied

Scientific EffectRoll-forming:

Implementation Method 3

the first joining device (8) joins the first and second edges (24, 25) of the roll-formed profile together in a material-bonded manner, thus closing the profile

Methodology Applied

Scientific EffectMaterial bonding:

Implementation Method 4

the second joining device (9) joins the profiled metal strip (22) and the bursting metal strip (21) together in a material-bonded manner

Methodology Applied

Scientific EffectMaterial bonding:

Implementation Method 5

the cutting device (11) cuts the previously closed profile to length

Methodology Applied

Scientific EffectCutting:

Implementation Method 6

If, in an electrical cell with a sealed housing that has a closed profile (2), a gas builds up pressure inside the housing and the pressure reaches the bursting pressure, then the predetermined bursting point (26) bursts and the gas escapes from the inside of the housing into an outside space (32)

Methodology Applied

Scientific EffectPressure-induced rupture: Fracture Mechanics

Data Source

PatentEP4668420A1Method for a profiling installation, closed profile according to the method and housing with the closed profile

Publication Date: 2025.12.24 FISCHER EDELSTAHLROHRE

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AI summary

A method for a profiling machine (1) for producing a closed profile (2) for a sealed housing (3) for an electric cell is presented and described. The profiling machine (1) comprises an embossing device (4), a first punching device (5), a first joining device (8), a second joining device (9), a profiling device (10), and a cutting device (11). The object of the present invention is to provide a method for the profiling machine (1) for producing a closed profile (2) with a pressure relief valve, which can be manufactured more cost-effectively than in the prior art or at least represents an alternative. This object is achieved by a method comprising the following steps: embossing a predetermined burst point (26) into a burst metal strip (21) by the embossing device (4) for forced venting at a burst pressure.Punching an opening (27) by the first punching device (5) in a profile metal strip (22) with a first strip edge (24) and a second strip edge (25) matching the predetermined burst point (26). Joining the profile metal strip (22) and the burst metal strip (21) together by the second joining device (9) so that the predetermined burst point (26) and the opening (27) in the profile metal strip (22) are aligned. Roll forming of the profile metal strip (22) into a profile by the profiling device (10). Joining the first strip edge (24) and the second strip edge (25) of the roll-formed profile together by the first joining device (8) so that the profile is closed. Cutting the previously closed profile to length by the cutting device (11) so that the closed profile (2) is formed.