[Technology] Joule: Challenging Traditional Slow Manufacturing to Improve Battery Cycle Life Through Rapid Manufacturing

[Research Background]

Formation is a critical step in the manufacturing of lithium-ion batteries. During the formation process, the electrolyte is reduced at the anode, resulting in the formation of a Solid Electrolyte Interphase (SEI) layer. To ensure the stability of the SEI layer, traditional formation processes are typically conducted at low current densities, which are time-consuming and expensive. Optimizing the formation process is essential for balancing battery performance and manufacturing efficiency. However, the optimization of the formation process faces numerous challenges due to the complex relationship between formation parameters and battery aging mechanisms, as well as the high dimensionality of the experimental parameter space and the long feedback cycles. 

Cell Section: Detailed Process Introduction of Cell Formation and Capacity Testing

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.

Battery Technology | Button Cell Battery Manufacturing Process (Includes Practical Testing Tutorial)

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.

Battery Cell Section: Introduction to the Manufacturing Process of Lithium-ion Battery Pouch Cells

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.

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.

Some common concepts and indicators of lithium batteries

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.

Battery Cell Introduction

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.

Battery cell production process

 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

【Battery Products】Characteristics and comparative analysis of cylindrical, square shell, soft pack battery cells and battery packs

 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 vehicles, a large number of single cells are required to form battery modules and battery packs, and the connection loss and BMS management complexity are greatly increased. In addition, the weight is large. Compared with some other shapes of batteries, the weight at the same capacity may be large, which may not be suitable for some applications with high lightweight requirements.

explanation of lithium-ion power battery technology - battery cell

What are battery cells? How many types are there?

The cell of a lithium-ion battery is the core unit for storing and providing electrical energy in a lithium battery system. Each cell stores and releases electrical energy through electrochemical reactions. The components of a lithium-ion secondary rechargeable battery include a cell and a protection circuit board. Among them, the cell is the core part of the rechargeable battery responsible for storing electrical energy, while the protection circuit board is responsible for the safety management of the battery. If the protection circuit board is removed, the remaining part is the cell. The quality of the cell directly determines the overall performance and quality of the rechargeable battery.