How to make a lithium battery for an electric car

Method 1: The pulping materials are mixed with powdery active substances of positive and negative electrodes with special solvents and adhesives, and mixed evenly at high speed to produce pulp-like substances of positive and negative electrodes.

Method 2: The coating film is uniformly coated on the surface of the metal foil, and dried to form positive and negative pole pieces respectively.

Method 3: Assembly according to the positive electrode sheet - the diaphragm - the negative electrode sheet - the diaphragm is placed in the order from top to bottom, after winding to form the battery core, and then into the electrolyte, sealing and other processes, that is, complete the battery The assembly process is made into a finished battery.

Method 4: The product is charged and discharged with a special battery charging and discharging device. And each battery is tested, and the qualified finished battery is screened and ready for delivery.

A lithium battery is a type of battery using a lithium metal or a lithium alloy as a negative electrode material and using a nonaqueous electrolyte solution. The first scientist to invent a lithium battery was Edison. Of course, people are now completely familiar with lithium batteries, especially after they are widely used in vehicles, electric vehicles and other transportation fields. People's attention to lithium batteries has been upgraded to a higher level.

Lithium battery classification

1. According to internal materials, lithium batteries are usually divided into two categories:

Lithium metal battery: A lithium metal battery is generally a battery using manganese dioxide as a positive electrode material, metallic lithium or an alloy metal thereof as a negative electrode material, and a nonaqueous electrolyte solution.

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

Although the lithium metal battery has a high energy density, it can theoretically reach 3,860 watts/kg. However, since it is not stable enough and cannot be charged, it cannot be used as a power battery for repeated use. Lithium-ion batteries have been developed as the main power battery due to their ability to be repeatedly charged. However, because of its combination with different elements, the composition of the cathode material varies greatly in various aspects, leading to an increase in the industry's disputes over the cathode material route.

Generally, the most commonly used power batteries are lithium iron phosphate batteries, lithium manganate batteries, lithium cobalt oxide batteries, and ternary lithium batteries (ternary nickel cobalt manganese).

2. By purpose it can also be divided into two broad categories:

The first one is the digital battery, which is the daily mobile phone, tablet, mobile power supply, etc. These are all digital batteries.

The second type is the power battery, which is Tesla, BYD some new energy electric vehicles, and batteries for products such as drones. These batteries require a large amount of instantaneous current, and digital batteries cannot meet the instantaneous high current, so this class is also called a high rate battery, and the price is more expensive than the digital battery.

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

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

The second type, the aluminum shell battery, the same shell is made of aluminum.

The third category, polymer battery, the shell is a polymer material, mostly silver, a few manufacturers do is black, the industry became black leather.

4. According to the shape is also divided into three categories:

The first type, cylindrical battery, this kind of use, such as 18650, 26650, etc., this general combination, the combination of less can be used as a digital product, like the early notebook computer, generally 8 18650, mobile power, A combination of five to six, and Tesla's more than 7,000 18650 series-parallel combination.

Second, square batteries, most of which are polymer batteries, because this polymer has good ductility and can be made in many shapes. The length, width and height can be adjusted at will. Now most digital products use these batteries. .

The third type of shaped battery is some grotesque battery. According to the demand of the product, the battery should also have the matching shape. For example, the popular smart wearable products, such as the smart bracelet, are ring-shaped, so the battery is also made into a ring shape.

Detailed description of the production process flow chart of lithium battery

Lithium battery structure

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

(1) The positive electrode of a lithium battery contains an active material, a conductive agent, a solvent, a binder, a matrix, and the like.

(2) The negative electrode of a lithium battery contains an active material, a binder, a solvent, a matrix, and the like.

(3) Lithium battery separator

(4) Lithium battery electrolyte

(5) The lithium battery case contains steel shells, aluminum shells, cover plates, tabs, insulating tape and other hardware.

Objectively speaking, the lithium battery production process is divided into three major sections, one is the production of pole pieces, the second is the production of batteries, and the third is battery assembly. In the lithium battery production process, the pole piece production is the foundation, the battery core production is the core, and the battery assembly is related to the quality of the lithium battery product. The specific steps of the lithium battery production process include positive electrode drawing, negative electrode drawing, positive electrode sheet, negative electrode sheet, steel shell assembly, liquid injection and testing, and packaging.

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