Lithium Button Cell Electrode Groove for Stable Pulse Discharge
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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, making mass production difficult.
Innovation Solution
A lithium primary button cell design with a negative electrode featuring a concave groove for tightly embedding a negative electrode modification film, which includes a porous structure for ion adsorption, good conductivity, and high strength, ensuring structural stability and improved ion and electron conduction.
Engineering Contradictions & Design Principles
Engineering 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
Solution Approach 1:
The patent uses a composite structure consisting of a carbon material layer combined with a metal mesh skeleton. The metal mesh provides mechanical strength and structural support, while the carbon material layer maintains its function of reducing side reactions and improving conductivity. This composite approach resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The metal mesh skeleton features a porous structure with specific pore size and distribution that allows the carbon material layer to be embedded within it. This porous structure provides both mechanical support and pathways for ion transport, maintaining electrical conductivity while preventing the carbon layer from detaching.
2Reliability
If electrode layers with good affinity or conductivity are prepared to improve performance, then the cell performance is improved, but a special process is required and the requirements for process and materials are high, making mass production difficult
Solution Approach 1:
The electrode structure is segmented into distinct functional components: a metal mesh skeleton providing structural framework, a carbon material layer for conductivity enhancement, and an active material layer for electrochemical reactions. This segmentation allows each component to be optimized and manufactured separately using standard processes, then assembled together.
Solution Approach 2:
The patent optimizes key parameters such as the pore size of the metal mesh, the thickness and composition of the carbon layer, and the loading amount of active material. By controlling these parameters within specific ranges, the cell achieves good performance while using conventional manufacturing techniques suitable for mass production.
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 enhances lamination stability, prevents side reactions, and improves discharge performance in extreme environments by adsorbing positive electrode ions and electrolytes, ensuring reliable large current discharge and pulse discharge capabilities.
Implementation Method 1
the negative electrode modification film has a porous structure... which can well adsorb dissolved positive electrode active ions in a pore structure
Implementation Method 2
the modification layer can increase the conduction rate of ions and electrons of the cell during the discharging process
Data Source
Figure 1~2
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Figure 5~6
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.