Battery Cell Terminal Venting With Stable Welded Contact

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Solution Overview

Problem

Existing battery systems for electrically driven work appliances lack safety features to manage pressure buildup and exhaust gas discharge effectively, particularly when high energy content is required, and often rely on unreliable electrical connections that can be compromised by corrosion.

Innovation Solution

A battery apparatus with a safety valve featuring a moving part that transitions from a closed to an open position to release excess pressure and exhaust gas, while maintaining a reliable integral connection with the terminal through a welded or soldered connection, ensuring safe and efficient power supply even under high energy conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a safety valve with a moving part is integrated into the terminal to allow exhaust gas discharge, then safety is improved, but the reliability of electrical contact may deteriorate due to potential movement or loosening

Engineering Contradiction:

Improvepressure buildup and exhaust gas accumulationVSAvoidelectrical contact reliability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The safety valve is merged with the terminal structure, where the moving part of the safety valve is formed as an integrated component of the terminal. This combination ensures that the electrical contact function and safety valve function are unified, eliminating the risk of loosening between separate components while maintaining both electrical conductivity and pressure relief capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cell contacting device is designed with a pre-established integral connection to the terminal, creating a reliable electrical contact before operation begins. This preliminary secure connection ensures that even when the safety valve moves during operation, the electrical contact remains stable and reliable

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If the cell contacting device has a force-fit connection with the terminal, then ease of assembly is improved, but reliability deteriorates due to corrosion and connection loosening

Engineering Contradiction:

Improveassembly simplicityVSAvoidelectrical contact stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The connection method transitions from a simple mechanical force-fit (one-dimensional pressing) to a multi-dimensional integral connection that combines mechanical bonding with electrical conductivity. The cell contacting device is integrally connected to the terminal through welding or soldering, creating a robust connection that resists corrosion and loosening while maintaining electrical contact

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If the safety valve moving part is securely held to maintain electrical contact, then electrical connection reliability is improved, but the safety valve cannot open to release pressure

Engineering Contradiction:

Improveelectrical contact stabilityVSAvoidpressure release capability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The safety valve moving part is designed to be dynamic rather than fixed, allowing it to move between closed and open positions in response to pressure changes. The integral connection maintains electrical contact throughout this movement, ensuring reliability while enabling pressure release functionality

Inventive Principle:

Principle #15Dynamics

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 solution provides a safer battery system with enhanced safety features for managing pressure and gas discharge, while maintaining reliable electrical contact, even under high energy demands and vibrational conditions, thus preventing damage and ensuring consistent power supply.

Implementation Method 1

The safety valve is embodied or configured with a moving part of a surface of the terminal, with movement from a closed position for outward movement or opening into an open position... when a pressure of exhaust gas generated by an electrochemical reaction occurring on the inside or within the battery cell exceeds a predetermined limit pressure

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

a pressure of exhaust gas generated by an electrochemical reaction occurring on the inside or within the battery cell

Methodology Applied

Scientific EffectElectrochemical reaction:

Data Source

PatentUS12519175B2Battery apparatus and work system

Publication Date: 2026.01.06 ANDREAS STIHL AG & CO KG

AI summary

A battery apparatus supplies electrical drive power to an electrically driven work appliance. The battery apparatus includes at least one battery cell. The battery cell has a terminal with a safety valve. The safety valve is embodied with a moving part of a surface of the terminal, with movement from a closed position for outward movement into an open position. The battery apparatus includes at least one cell contacting device. The cell contacting device has electrical contact with the terminal by way of at least one integral connection in the closed position of the moving part and allows the movement of the moving part.