Roll Pressing Process of Lithium-ion Battery Electrodes

【Overview】：
The rolling of battery electrodes involves the friction between the rollers and the electrode, which draws the electrode sheet into the gap between the rotating rollers. During this process, the electrode sheet undergoes compression and deformation. Unlike the rolling of steel, where the rolling process mainly causes the material to extend longitudinally and widen laterally without a change in density, the rolling of battery electrodes focuses on the compaction of active material on both the positive and negative electrode sheets. During this process, the particles undergo migration, rearrangement, and embedding, resulting in reduced voids between particles and a denser arrangement. The purpose is to increase the compaction density of the positive or negative electrode materials. Proper compaction density can increase battery discharge capacity, reduce internal resistance, minimize polarization loss, extend cycle life, and improve the utilization rate of lithium-ion batteries.

Roll Pressing Process of Lithium-ion Battery Electrodes

【Overview】：

The rolling of battery electrodes involves the friction between the rollers and the electrode, which draws the electrode sheet into the gap between the rotating rollers. During this process, the electrode sheet undergoes compression and deformation. Unlike the rolling of steel, where the rolling process mainly causes the material to extend longitudinally and widen laterally without a change in density, the rolling of battery electrodes focuses on the compaction of active material on both the positive and negative electrode sheets. During this process, the particles undergo migration, rearrangement, and embedding, resulting in reduced voids between particles and a denser arrangement. The purpose is to increase the compaction density of the positive or negative electrode materials. Proper compaction density can increase battery discharge capacity, reduce internal resistance, minimize polarization loss, extend cycle life, and improve the utilization rate of lithium-ion batteries.

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.

Presentation of Wanhua Chemical: Comprehensive Solutions for Lithium Battery Anode Binders

Overview of Lithium - Ion Battery Binders 

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.

Comprehensive Solution for Negative Electrode Binders for Lithium Batteries                                                                                                                                                                                            

Overview of Lithium-ion Battery Binders

In the production of lithium-ion batteries, binders are often referred to as "auxiliary materials" together with conductive agents, additives, etc., but they are an indispensable key material. Their main function is to adhere active substances and conductive agents to the current collector to ensure electrical contact between powder material particles in the electrode and between the powder material and the current collector. Binders have a low mass ratio in the electrode and do not participate in electrochemical reactions. Their main function is to adhere active substances and conductive agents to the current collector to keep the electrode intact. Binders affect the formation of the solid electrolyte interface (SEI), charge transfer inside the electrode and between the electrode-electrolyte interface, the wetting behavior of the electrode, and the cycle performance and cost of the battery. Therefore, an ideal binder can ensure the stability of the electrode structure with the least possible usage.

PVDF, CMC, PAA, etc.! Research on Lithium Battery Binders

LIBs electrodes are mainly composed of electrochemically active electrode materials, conductive additives, binders, current collectors, etc. Among them, binders are an important component of LIBs electrodes. Binders can tightly attach active substances and conductive agents to the current collector to form a complete electrode, prevent the active substances from falling off and peeling off during the charge and discharge process , and can evenly disperse the active substances and conductive agents, thereby forming a good electron and ion transmission network and realizing efficient transmission of electrons and lithium ions.