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一.Introduction As a representative of modern high-performance secondary batteries, each stage of the manufacturing process of lithium-ion batteries directly impacts the performance, lifespan, and safety of the final product. Among these, Formation and Aging & Grading are crucial post-processing techniques in cell manufacturing. This article will systematically analyze the core aspects of these processes, covering their principles, key parameters, influencing factors, and directions for technological development. 二. Formation Process 1. Definition and Purpose of Formation Process The formation process refers to the initial charging activation of a cell, during which solid electrolyte interface (SEI) films are formed on the surface of the anode through electrochemical reactions. The main functions include: SEI Film Formation: Passivating the active surface of the anode to prevent continuous decomposition of the electrolyte. Removal of Residual Moisture: Reducing moisture content thr...

Introduction: Button cells are one of the commonly used battery types in laboratories, widely applied in material development, electrochemical performance testing, and other fields. This article provides a detailed introduction to the complete process of button cell electrode preparation and battery assembly, including required materials, equipment, steps, and precautions, offering comprehensive guidance for relevant researchers. 一. Overview of Button Cells Button cells consist of a set of button cell casings and internal components. Stainless steel battery casings are widely used in laboratory testing due to their good electrochemical stability, excellent sealing, small size, simple assembly, and low cost. Common models include CR2032, CR2025, CR2016, etc., with CR2032 battery casings (20mm in diameter, 3.2mm in thickness) often used in laboratories. Additionally, there is a reusable Swagelok battery, with a stainless steel casing and PTFE liner, suitable for battery disassembly and a...

Introduction Soft-pack battery cells, referring to cells using aluminum-plastic composite film as packaging material, have seen widespread application in the lithium-ion battery field due to their high energy density, enhanced safety, and flexible design. Below, I will provide a detailed introduction to the manufacturing process of soft-pack battery cells, covering material preparation, critical steps, and post-processing aspects. 1. Cell Design Cell design refers to the process of assembling the cathode material, anode material, electrolyte, separator, and current collectors for the positive and negative electrodes in specific proportions and processes to meet particular electrical performance requirements. This process requires designers to understand the characteristics of various materials, possess extensive electrochemical knowledge, and have the ability to think logically and comprehensively. 1.1 Clarify Design Requirements It's important to clarify the usage scenarios for th...

Analysis of manufacturing processes of lithium batteries with different packaging methods: square, cylindrical, and soft pack Automotive Technician ,praise In the new energy era, lithium batteries are the core power and energy storage unit, and their importance is self-evident. Among the many characteristics of lithium batteries, the external form of packaging shape actually contains complex technical considerations and process logic. The three mainstream packaging shapes of square, cylindrical, and soft pack each correspond to a unique process, like three keys, opening the door to different application scenarios. This article will deeply analyze the technical routes and process secrets behind these three lithium battery packaging shapes.

1. Why choose lithium battery? At present, most power batteries are still lithium batteries. Of course, sodium-ion batteries are gradually beginning to be mass-produced, but they are not the main players yet.

1. Classification of battery cells 1.1. Introduction to energy storage Nickel battery: Nickel-metal hydride battery is a good performance battery. The positive active material of nickel-metal hydride battery is Ni(OH)2 (called NiO electrode), the negative active material is metal hydride, also called hydrogen storage alloy (the electrode is called hydrogen storage electrode), and the electrolyte is 6mol/L potassium hydroxide solution. The advantages of nickel battery are: high energy density, fast charge and discharge speed, light weight, long life, no environmental pollution; the disadvantages are slight memory effect, more management problems, and easy formation of monomer battery separator melting.

  1. Production process of battery cells The production process of cylindrical batteries: front process, middle process and back process. Pre-process  : Process the positive and negative electrode materials and current collectors into a certain coating weight and size The positive and negative electrodes Middle process  : Wind the pole piece and diaphragm made in the previous process into a winding core and then put it into the shell. The electrolyte is injected and sealed to form a complete battery structure. Post-process  : An important battery process for the first charging, discharging and activation of cylindrical batteries

  1. Overview of three types of batteries 1. Cylindrical battery cell The cylindrical battery cell was first invented by Sony Corporation of Japan in 1992. It has a long history of development and a high degree of standardization. Common models include 18650, 21700, 46800, etc. It adopts a mature winding process, with a high degree of automation, high production efficiency, good consistency and relatively low cost. For example, the 21700 battery used in Tesla Model 3 and Model Y, and the 46800 battery that is about to be mass-produced, once made the cylindrical battery cell popular in the market. However, there are also some problems with cylindrical batteries. Due to the cylindrical shape, the space utilization rate is low, and in the case of modularization, a large space waste will be caused. At the same time, the radial thermal conductivity is not good, the number of windings of the battery cannot be too many, and the single cell capacity is small. When used in electric vehicle...