Lithium Button Cell Electrode Groove for Stable Film Lamination

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Solution Overview

Problem

Existing lithium primary cells face issues with carbon material layers detaching, insufficient strength, and gaps with electrodes, and electrode layers requiring specialized processes, hindering mass production and stability in extreme environments.

Innovation Solution

A lithium primary button cell design featuring a negative electrode with a concave groove for embedding a negative electrode modification film, which enhances lamination tightness and flatness, and includes a porous structure for ion adsorption and conductivity, ensuring structural stability and improved performance in extreme conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If carbon material layers are disposed within the cells to reduce side reactions and improve conductivity, then the internal resistance of the cells is reduced, but the carbon material layers are prone to fall off, have insufficient strength, and have gaps with the electrodes

Engineering Contradiction:

Improveconductivity and internal resistanceVSAvoidstrength and adhesion of carbon material layer

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent uses a composite structure consisting of a carbon material layer and a metal mesh layer. The metal mesh layer provides mechanical strength and adhesion to prevent the carbon material layer from falling off, while the carbon material layer maintains its function of reducing side reactions and improving conductivity. This composite material approach resolves the contradiction between conductivity improvement and structural strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs a thin film structure where the carbon material layer is deposited as a thin coating on the metal mesh. This thin film approach allows the carbon layer to maintain good contact with the electrode while the underlying metal mesh provides the necessary mechanical support, preventing gaps and detachment issues.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If electrode layers with good affinity or conductivity are prepared, then the performance of the cells is improved, but a special process is required and the requirements for the process and materials are high, so the electrode layers cannot be mass-produced

Engineering Contradiction:

Improveaffinity and conductivity of electrode layersVSAvoidmanufacturing process complexity and mass production capability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent divides the electrode structure into distinct functional layers: a base electrode layer, a metal mesh layer for structural support, and a carbon material layer for conductivity enhancement. This segmentation allows each layer to be optimized independently and assembled through a standardized process, facilitating mass production while maintaining high performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent optimizes parameters such as the thickness of the carbon material layer, the mesh size of the metal mesh, and the deposition conditions to achieve the desired affinity and conductivity. By carefully controlling these parameters within specific ranges, the patent achieves high performance electrode layers that can be manufactured using conventional processes suitable for mass production.

Inventive Principle:

Principle #35Parameter changes

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 design ensures stable lamination, reduces side reactions, and enhances conductivity and capacity, maintaining performance under vibration, high temperature, and low temperature conditions, with a simple processing technique for mass production.

Implementation Method 1

includes a porous structure for ion adsorption and conductivity

Methodology Applied

Scientific EffectIon adsorption: Adsorption

Data Source

PatentUS20260038801A1Lithium primary button cell, preparation method thereof, and electronic device

Publication Date: 2026.02.05 EVE ENERGY CO LTD

AI summary

Provided are a lithium primary button cell, a preparation method thereof, and an electronic device. The lithium primary button cell includes a cell housing (10) and a cell core assembly located within the cell housing (10). The cell core assembly includes a negative electrode (3), a negative electrode modification film (4), separators (5, 6), and a positive electrode (7) that are stacked sequentially. The surface of one side of the negative electrode (3) facing the negative electrode modification film (4) is formed with a concave groove (9) into which the negative electrode modification film (4) is tightly embedded. In the present application, the structure and materials of the lithium primary button cell are optimized so that the lithium primary button cell can have excellent discharging performance and good stability and reliability.