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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