6F22 carbon battery.Detailed explanation of the production process of lithium batteries

　　Electronic enthusiasts provide you with a detailed explanation of the production process flow chart of lithium batteries. Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. The first scientist to invent lithium batteries was Edison. Of course, people are no longer unfamiliar with lithium batteries now. Especially after they are widely used in automobiles, electric vehicles and other transportation fields, people's attention to lithium batteries has been raised to a higher level. Lithium battery concept

　　Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. The first scientist to invent lithium batteries was Edison. Of course, people are no longer unfamiliar with lithium batteries now. Especially after they are widely used in automobiles, electric vehicles and other transportation fields, people's attention to lithium batteries has been raised to a higher level.

　　Classification of lithium batteries

　　1. Lithium batteries are usually divided into two categories according to internal materials:

　　Lithium metal battery: Lithium metal battery generally uses manganese dioxide as the positive electrode material, metallic lithium or its alloy metal as the negative electrode material, and uses a non-aqueous electrolyte solution.

　　Lithium-ion battery: Lithium-ion battery generally uses lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and a non-aqueous electrolyte.

　　Although the energy density of lithium metal batteries is high, it can theoretically reach 3860 watts/kg. However, because its properties are not stable enough and cannot be recharged, it cannot be used as a power battery for repeated use. Lithium-ion batteries are developed as the main power batteries due to their ability to be charged repeatedly. However, because they are combined with different elements, the performance of the cathode materials they form varies greatly in various aspects, which has led to increased disputes over the cathode material route in the industry.

　　Usually the power batteries we talk about most include lithium iron phosphate batteries, lithium manganese oxide batteries, lithium cobalt oxide batteries and ternary lithium batteries (ternary nickel cobalt manganese)

　　2. According to use; it can also be divided into two categories:

　　The first one is digital batteries, which are the mobile phones, tablets, mobile power supplies, etc. that we use every day. These are all digital batteries.

　　The second type is power batteries, which are batteries used in some new energy electric vehicles such as Tesla and BYD, as well as drones and other products. These batteries require a large instantaneous current. Digital batteries cannot meet the large instantaneous current, so this This kind of battery is also called high-rate battery, and its price is more expensive than digital battery.

　　3. According to the shell material, it can be divided into three categories:

　　The first category, steel-cased batteries, as the name implies, is that the outer casing is made of steel.

　　The second category is the aluminum shell battery. Similarly, the shell is made of aluminum.

　　The third category, polymer batteries, has a casing made of a polymer material, mostly silver. A few manufacturers make black batteries, which makes them black in the industry.

　　4. There are three categories according to shape:

　　The first type is cylindrical battery, which is widely used, such as 18650, 26650, etc., which are generally used in combination. Those with fewer combinations can be used as digital products, such as early laptops, usually 8 18650, mobile power supply, There are combinations ranging from one to five or six, as well as Tesla’s more than 7,000 18,650 series and parallel combinations.

　　The second type is prismatic batteries. Most of these are polymer batteries, because this polymer has good ductility and can be made into many shapes. The length, width and height can be adjusted at will. Most digital products now use this type of battery. .

　　The third type, special-shaped batteries, are some strange-shaped batteries. The battery must be in a matching shape according to the needs of the product. For example, the current popular smart wearable products, such as smart bracelets, are ring-shaped, so the batteries are also made in a ring shape.

　　The structure of lithium battery

　　The structure of lithium battery is divided into five parts, namely positive electrode, negative electrode, separator, electrolyte and casing.

　　(1) The positive electrode of lithium battery contains active material, conductive agent, solvent, binder, matrix and other substances.

　　(2) The negative electrode of lithium battery contains active materials, binders, solvents, matrix and other substances.

　　(3) Lithium battery separator

　　(4) Lithium battery electrolyte

　　(5) The lithium battery shell includes steel shell, aluminum shell, cover plate, pole tab, insulating tape and other hardware.

　　Lithium battery production flow chart

　　The production process of lithium batteries is not very consistent for each manufacturer, but most of them are inseparable from these links, as shown below:

　　Specifically as follows: Material preparation, homogenization, coating, rolling, slitting, baking, winding into shells, laser welding, baking, liquid injection, pre-filling, sealing, cleaning, aging, full inspection, warehousing, and shipment.

　　Lithium battery production process flow

　　Objectively speaking, the lithium battery production process is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. In the lithium battery production process, pole piece production is the foundation, battery core production is the core, and battery assembly is related to the quality of the finished lithium battery. The specific steps of the lithium battery production process include positive electrode slurrying, negative electrode slurrying, positive electrode sheets, negative electrode sheets, steel case assembly, liquid injection and testing, and packaging.

　　Introduction to lithium battery production process

　　As we all know, the production process of lithium batteries is quite complicated. After all, the safety performance of lithium-ion battery products is directly related to the life and health of consumers. Naturally, the production and manufacturing of lithium batteries has high requirements on the performance, accuracy, stability and automation level of the equipment. . Take the preparation of electrode slurry in the lithium battery production process as an example. This link is the most front-end link and the most important link in the entire production process. After all, the electrode slurry mixing and dispersion process has an impact on product quality of more than 30%. %. Why?

　　The reason is that the preparation of positive and negative electrode slurries for lithium batteries includes a series of processes such as mixing, dissolving, and dispersing liquids and liquids, liquids and solid materials, and is accompanied by changes in temperature, viscosity, environment, etc. In the positive and negative electrode slurries, the dispersion and uniformity of the granular active materials directly affect the movement of lithium ions between the two poles of the battery, so the dispersion quality of the electrode slurry directly affects the product performance of lithium batteries.

　　It can be seen that all aspects of the lithium battery production process are closely related to product quality and safety. Every aspect of the lithium battery production process must be strictly and carefully managed in order to improve the safety performance of lithium battery products. .

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