Eight Characteristics of Battery Manufacturing

The safety of new energy vehicles has always been the focus of public attention. The public's concern and questioning of the new category, the spontaneous combustion problem is not exclusive to new energy vehicles under the magnifying glass, making people's judgment of the probability of electric vehicle safety somewhat "distorted".

But the electric new energy vehicle safety concerns are not unreasonable, because once it catches fire, combustion reaction speed is extremely fast, will cause very serious consequences.best lithium ion battery machine company This is because we are the core of the electric car is laid flat in the chassis under the battery, external high temperature or extrusion or poor battery quality, may trigger thermal runaway, which can lead to fire and explosion.

What is the nature of battery safety? Is there a way to manufacture high quality batteries? Compared with other general products, battery manufacturing has the following eight characteristics.

1. Uniform mixing of materials of different sizes

Lithium material size from nanometer to micron to millimeter, spanning a large, such a large span of materials mixed together, how to manage can effectively ensure that the mixing is uniform, not layered, not off, is to ensure that the system battery has the key to consistency equipment for lithium battery assembly.

2. Soft materials, hard positioning accuracy requirements

Diaphragm, positive and negative electrode are more than ten microns to hundreds of microns of soft film materials, in the assembly process need these materials aligned, solid, able to produce resistance to certain impacts in the use of the management process, and particle scale expansion / contraction changes do not directly affect the original structure of the solid, do not crack, do not fall off. And these soft materials, how to manufacture a process can not meet the design dimensional stability and consistent positioning of technical requirements, is to ensure the quality of the work of the battery key.

3. Unconcerned factors that have a great impact on quality

Battery manufacturing process of temperature uniformity, humidity, the amount and distribution of dust, the size and density of processing burrs, pole pieces in different environments to stay for a long time, will affect the degree of water absorption of the material, which in turn affects the quality of battery production. Therefore, battery manufacturers should develop standards to monitor and control these factors.

4. Continuous upgrading of the industry

As the application of batteries becomes more and more widespread and the demand becomes greater and greater, the materials, structures, manufacturing processes, manufacturing methods and equipment are constantly being upgraded and updated. These upgrades will inevitably bring uncertainty to the manufacturing process, these factors need to be fully considered in the planning and design of the manufacturing industry.

5. Manufacturing process from continuous to discrete step by step

Battery manufacturing is from powder pulping, coating, roller pressing and die-cutting, to the manufacturing process of winding or stacking, assembly, liquid injection, chemical formation and PACK. In this process, the material gradually from continuous pulp, foil, coating, roll pressure into film, to slitting, die-cutting separation gradient slitting, which is a continuous process, followed by winding or stacking, and gradually evolve completely, into a discrete monomer.

In this process, the linear, nonlinear and stochastic dynamic processes of the system are mixed with each other, which makes the bi-directional tracking of data, material unit correlation, model building and optimization become very complex.

6. Multi-source heterogeneity, massive data

In the battery manufacturing process, positive and negative electrodes are nano and micron-sized particles, connecting agents, conductive agents and solvents are liquids, copper foil, aluminum foil, adhesive paper and aluminum-plastic film are thin-film materials, and electrodes, shells and other mechanical structural components. The properties and morphology of semi-finished products vary from process to process and stage to stage. Temperature, humidity and dust also influence the state of the material.

When data are used to describe these characteristics and patterns, they manifest themselves in a variety of data sources and different data structures, with structured data, unstructured data data, and semi-structured data intermixed. The data of the individual characteristics of the manufacturing process should be digitized according to different data granularities. The features of these data can be integrated into multi-source, heterogeneous and large number of features. In the manufacturing process of storage batteries, it is necessary to accurately acquire these data, extract and manage them, establish the corresponding storage mode and management mode, and build the corresponding manufacturing model, in order to realize the basic goal of solving manufacturing problems with data.

7. Multi-physical field, multi-scale

Battery manufacturing technology involves chemistry, electrochemistry, ion dynamics, molecular dynamics, electronics, electromagnetism, machinery, control and fluids and other related disciplines. From the perspective of physics and chemistry, it involves thermal field, electric field, magnetic field, fluid field, molecular-atomic interactions; from the size aspect, it involves the laws of motion of particulate ions and molecules, the interaction and mixing of nanomaterials, nano and micrometer-level processing and manufacturing, and millimeter-to-meter-size product applications, which results in a complex process of battery manufacturing, and the revelation of the laws of motion of the electrons and ions in the battery, as well as control and management Difficulty, manifested in the generation and suppression of dendrites, solid electrolyte phase interface (SEI) film is difficult to accurately characterize and control.

Based on these characteristics, the manufacturing process not only controls parameters such as temperature, humidity, dust, pressure, deformation and vacuum, but also controls the working process, waiting time, size of the workspace, working environment, working time, manufacturing process, processing methods, working accuracy and working stability requirements to ensure that the battery manufacturing can achieve the desired manufacturing quality, manufacturing safety and manufacturing efficiency.

8. The scientific law of cause and effect relationship is not clear

Battery manufacturing is a complex and influential interdisciplinary science. Due to its complex theories, mechanisms and data, it is difficult to summarize clear scientific causal laws. There is a lack of quantitative and effective methods for scientific analysis of systems and assessment of system performance characteristics to meet the requirements of reconfigurable, large-scale and customized battery manufacturing as a universal product.

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