Cylindrical Li-Ion Cell Pressure Welding for Gas-Tight Sealing
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Solution Overview
Problem
The production of electrical energy storage cells faces challenges in achieving a reliable gas-tight seal without damaging the corrosion coating during welding, which can lead to high material stress and potential damage.
Innovation Solution
The use of pressure welding with a nickel-plated steel housing main body and a circumferentially connected contact element, employing methods like resistance welding or gap welding, ensures a robust and gas-tight connection while minimizing material damage and particle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to connect the contact element to the housing main body, then a reliable gas-tight connection is achieved, but the anti-corrosion coating may be destroyed and material stress increases
Solution Approach 1:
The patent replaces thermal welding processes with pressure welding, which uses mechanical pressure instead of heat to create the connection. This substitution eliminates the thermal damage that would otherwise destroy the anti-corrosion coating while still achieving a reliable gas-tight connection between the contact element and housing main body.
Solution Approach 2:
The patent changes the welding parameters from high-temperature thermal processes to controlled pressure application. By adjusting the pressure welding parameters (force, duration, contact area), the connection achieves gas-tight reliability without the harmful thermal effects that damage the coating.
2Reliability
If welding is used to connect the contact element to the housing main body, then a reliable gas-tight connection is achieved, but material stress and particle formation increase
Solution Approach 1:
The patent replaces thermal welding with pressure welding, substituting a mechanical connection process that distributes stress more evenly across the contact interface. This reduces localized material stress and minimizes particle formation compared to thermal welding methods.
3Strength
If traditional welding methods are used, then connection strength is achieved, but the housing coating is damaged and quality requirements are compromised
Solution Approach 1:
The patent replaces thermal welding processes with pressure welding, which maintains connection strength through mechanical bonding while preserving the housing coating integrity. The pressure welding process applies controlled force without the thermal damage that compromises coating quality.
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
This approach results in a high-quality, gas-tight energy storage cell that meets stringent requirements, reducing the risk of material damage and maintaining the anti-corrosion layer integrity, thus enhancing the cell's reliability and performance.
Implementation Method 1
the contact element is connected circumferentially to the housing main body by pressure welding
Implementation Method 2
the housing main body is made of a steel material, comprising an anti-corrosion layer. According to a preferred embodiment, the anti-corrosion layer is formed by a nickel layer
Data Source
AI summary
An energy storage cell, more particularly a lithium ion cell, has an especially cylindrical main housing body which extends along a longitudinal axis and defines a chamber in which an electrode material is arranged. The main housing body forms a first pole of the energy storage cell and is electrically conductively connected to the electrode material via a contact element, the contact element being circumferentially joined to the main housing body by pressure welding.