Electrode Plate Extension Area Stress Relief
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Solution Overview
Problem
Existing electrode plates experience concentrated stress in the transition area between the functional and non-coating areas during cold pressing, leading to irreversible deformation and weakened mechanical properties, affecting current conduction and energy density.
Innovation Solution
The electrode plate design includes a functional coating with an extension area that gradually transitions from the functional area to the non-coating area, maintaining a minimum thickness greater than 0 and less than the functional area thickness, which relieves concentrated stress by ensuring a smooth thickness gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high pressure is exerted during cold pressing manufacturing process to increase energy density, then the compacted density of electrode plate coating is improved, but concentrated stress is generated in the transition area between functional coating and non-coating area, causing irreversible deformation to current collector
Solution Approach 1:
The patent applies local quality by creating an extension area with gradually varying thickness between the functional coating area and non-coating area. This transition zone has different thickness characteristics than either the functional area or non-coating area, providing localized stress distribution that prevents concentrated stress at the transition boundary while maintaining high compacted density in the functional area.
Solution Approach 2:
The extension area is designed in advance during the coating formation process, creating a gradual thickness transition zone before the cold pressing process. This preliminary structural preparation ensures that when high pressure is applied during cold pressing, the stress is already distributed across a gradient structure, preventing irreversible deformation of the current collector.
2Use of energy by moving object
If high pressure is exerted during cold pressing manufacturing process, then energy density is improved, but concentrated stress causes irreversible deformation to current collector, affecting current conduction effect
Solution Approach 1:
The extension area creates a localized transition zone with gradual thickness variation, which modifies the stress distribution pattern during cold pressing. This local structural quality ensures that high pressure is distributed evenly, preventing deformation that would compromise current collector conductivity while maintaining high energy density in the functional coating area.
3Ease of manufacture
If gap coating method is used to manufacture electrode plate, then manufacturing process is simplified, but thickness difference between functional coating and non-coating area causes concentrated stress in transition area
Solution Approach 1:
Rather than using a abrupt gap coating method with sharp transitions, the patent introduces an extension area with gradual thickness variation. This local quality modification maintains the simplicity of the gap coating manufacturing approach while eliminating the concentrated stress problem by creating a smooth thickness gradient in the transition zone.
Data Source
AI summary
An electrode plate includes a current collector, where a functional coating and a non-coating area are provided on at least one surface of the current collector, the functional coating includes a functional area and an extension area that extends from the functional area to the non-coating area, and the extension area has a minimum thickness greater than 0 and a maximum thickness less than a thickness of the functional area. This relieves the problem of concentrated stress on the current collector in a transition area between the functional coating and the non-coating area on the electrode plate and improve mechanical property and a current conduction effect of the current collector, thereby improving properties such as cycling performance and safety of the electrochemical apparatus.