Modeling decomposition of lithium battery injection and infiltration process

ThomasKnoche's model structure can be divided into three steps. The first step to build the model is to subdivide the injection process. The influencing factors of the liquid injection process can be subdivided into product design, liquid injection equipment, process characteristics, liquid injection equipment, and product quality and process quality. The product design can be continuously subdivided into several more detailed parts, especially when the working mechanisms of these parts are different, specific divisions should be made. For example, regarding the lithium battery injection process, the battery design can be divided into battery structure And battery materials are two parts. The battery structure represents the macro structure of the battery, and the battery material represents the physical and chemical properties of the battery material. The equipment and process execution represent the influence of the processing process on the battery characteristics. Process phenomenon is the core of this layer model, so process phenomenon describes the causal relationship between other different parts. In the end, the above-mentioned input factors will ultimately be reflected in the quality of transported products and process quality. 2. Model use 2.1 Liquid injection process The liquid injection and infiltration of lithium batteries can be subdivided into multiple steps of liquid injection, sealing and infiltration, as well as preparation work between each step. According to the method of constructing the model above, the liquid injection and infiltration process of the lithium battery can be represented by the following figure. The arrows in the figure below indicate the causal relationship between the various factors in the liquid injection process. It can be seen from the figure that the liquid injection process is critically affected by two factors, the liquid injection system and the system pressure. The system pressure will affect the battery injection preparation, injection, infiltration before sealing and infiltration after sealing. It can be seen that the system pressure is the most important factor in the process of battery system injection and infiltration. The current common liquid injection methods are divided into two categories, one is to inject the liquid directly through the injection hole (the most mainstream method), and the other is to put the battery into the electrolyte to allow the electrolyte to penetrate into the battery. The method of liquid injection through the liquid injection hole can be divided into single injection and multiple injection (affected by the battery structure and batch) according to the injection volume. Several injection methods have different measures to promote infiltration. The single injection method promotes the infiltration of the electrolyte in the cell through repeated pumping, while the multiple injection method promotes the use of pressure. The electrolyte is infiltrated in the cell, and the immersion injection has no measures to promote the infiltration. 2.2 Liquid injection equipment The equipment used for injection and infiltration, and the causal relationship between the equipment are shown in the following figure. It can be seen that the injection equipment is mainly composed of three parts: 1) injection equipment; 2) pressure control equipment, vacuum equipment and pressurization equipment; 3) battery fixing structure. 2.3 Process characteristics The factors affecting battery injection and wetting are shown in the following figure, and the causal relationship between them is shown by the arrow. The liquid injection of lithium batteries is critically affected by the battery structure, battery materials and liquid injection process. 2.4 Product design This part of product design can be divided into two parts: 1) battery material selection; 2) battery structure design. Different materials have different physical and chemical properties, so the choice of materials for lithium batteries determines the infiltration speed of the electrolyte, such as the viscosity and surface tension of the electrolyte, the micropore structure of the porous material, the contact angle between the electrolyte and the positive and negative materials, etc. The characteristics will affect the wettability of the battery. Before the electrolyte is infiltrated into the battery cell, it will first be stored in the outer shell of the lithium battery. Therefore, the structure of the battery (square or cylindrical, hard shell or soft pack, laminated or wound) will have a certain degree of infiltration of the electrolyte. influences. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Introduction to the activation method of iron lithium ion battery and new lithium ion battery