Soft-pack lithium-ion battery production technology and process flow
The composition of aluminum-plastic packaging film (referred to as
aluminum-plastic film) is shown in the figure. Its cross-section consists of
three layers: nylon layer, Al layer and PP layer.
Each of the three layers has its own role. First, the nylon layer ensures
the shape of the aluminum-plastic film and ensures that the film will not deform
before it is manufactured into a lithium-ion battery.
The Al layer is composed of a layer of metal Al, and its function is to
prevent water from penetrating. Lithium-ion batteries are very afraid of water.
Generally, the moisture content of the pole pieces is required to be at the PPM
level, so the packaging film must be able to block the penetration of water
vapor. Nylon is not waterproof and cannot provide protection. Metal Al will
react with oxygen in the air at room temperature to form a dense oxide film,
which prevents water vapor from penetrating and protects the inside of the
battery core. The Al layer also provides the plasticity for punching when the
aluminum plastic film is formed. Please see point 3 for details.
PP is the abbreviation of polypropylene. The characteristic of this
material is that it melts at temperatures of more than 100 degrees Celsius and
is sticky. Therefore, the thermal sealing of batteries mainly relies on the PP
layer being melted and bonded together under the action of heating of the
sealing head. Then the sealing head is removed and the temperature is reduced to
solidify and bond.
Aluminum plastic film looks very simple, but in actual practice, it is not
so easy to combine the three layers of materials evenly and firmly together.
Unfortunately, good-quality aluminum-plastic films are basically imported from
Japan. Domestic ones are not available, but the quality still needs to be
improved.
Aluminum plastic film forming process
Soft-packed batteries can be designed into different sizes according to
customer needs. After the outer dimensions are designed, corresponding molds
need to be opened to form the aluminum-plastic film. The molding process is also
called punching (in fact, I personally think it should be "gun pit", but
everyone just writes it like this). As the name suggests, it uses a forming mold
to punch out a hole on the aluminum-plastic film that can be installed under
heating. The core pit
Soft-packed batteries are actually batteries that use aluminum-plastic
packaging film as packaging material. Relatively speaking, the packaging of
lithium-ion batteries is divided into two categories, one is soft-packed cells
and the other is metal-cased cells. Metal-cased batteries include steel shells,
aluminum shells, etc. In recent years, due to special needs, some batteries use
plastic shells, which can also be classified into this category.
The difference between the two is not only the shell material, but also the
packaging method. Soft-packed batteries use thermal packaging, while metal-cased
batteries generally use welding (laser welding). The reason why soft-packed
batteries can be thermally sealed is that they use aluminum-plastic packaging
film.
1. Soft-packed batteries
The so-called soft-packed batteries are actually batteries that use
aluminum-plastic packaging film as packaging material. Relatively speaking, the
packaging of lithium-ion batteries is divided into two categories, one is
soft-packed cells and the other is metal-cased cells. Metal-cased batteries
include steel shells, aluminum shells, etc. In recent years, due to special
needs, some batteries use plastic shells, which can also be classified into this
category.
The difference between the two is not only the shell material, but also the
packaging method. Soft-packed batteries use thermal packaging, while metal-cased
batteries generally use welding (laser welding). The reason why soft-packed
batteries can be thermally sealed is that they use aluminum-plastic packaging
film.
The composition of aluminum-plastic packaging film (referred to as
aluminum-plastic film) is shown in the figure. Its cross-section consists of
three layers: nylon layer, Al layer and PP layer.
Each of the three layers has its own role. First, the nylon layer ensures
the shape of the aluminum-plastic film and ensures that the film will not deform
before it is manufactured into a lithium-ion battery.
The Al layer is composed of a layer of metal Al, and its function is to
prevent water from penetrating. Lithium-ion batteries are very afraid of water.
Generally, the moisture content of the pole pieces is required to be at the PPM
level, so the packaging film must be able to block the penetration of water
vapor. Nylon is not waterproof and cannot provide protection. Metal Al will
react with oxygen in the air at room temperature to form a dense oxide film,
which prevents water vapor from penetrating and protects the inside of the
battery core. The Al layer also provides the plasticity for punching when the
aluminum-plastic film is formed. See point 3 for details.
PP is the abbreviation of polypropylene. The characteristic of this
material is that it melts at temperatures of more than 100 degrees Celsius and
is sticky. Therefore, the thermal sealing of batteries mainly relies on the PP
layer being melted and bonded together under the action of heating of the
sealing head. Then the sealing head is removed and the temperature is reduced to
solidify and bond.
Aluminum plastic film looks very simple, but in actual practice, it is not
so easy to combine the three layers of materials evenly and firmly together.
Unfortunately, good-quality aluminum-plastic films are basically imported from
Japan. Domestic ones are not available, but the quality still needs to be
improved.
3. Aluminum plastic film forming process
Soft-packed batteries can be designed into different sizes according to
customer needs. After the outer dimensions are designed, corresponding molds
need to be opened to form the aluminum-plastic film. The molding process is also
called punching (in fact, I personally think it should be "gun pit", but if
everyone writes it this way, just follow the convention), as the name suggests,
it is to use the forming mold to punch out a hole on the aluminum-plastic film
that can be installed under heating. The pit in the core,
The composition of aluminum-plastic packaging film (referred to as
aluminum-plastic film) is shown in the figure. Its cross-section consists of
three layers: nylon layer, Al layer and PP layer.
Each of the three layers has its own role. First, the nylon layer ensures
the shape of the aluminum-plastic film and ensures that the film will not deform
before it is manufactured into a lithium-ion battery.
The Al layer is composed of a layer of metal Al, and its function is to
prevent water from penetrating. Lithium-ion batteries are very afraid of water.
Generally, the moisture content of the pole pieces is required to be at the PPM
level, so the packaging film must be able to block the penetration of water
vapor. Nylon is not waterproof and cannot provide protection. Metal Al will
react with oxygen in the air at room temperature to form a dense oxide film,
which prevents water vapor from penetrating and protects the inside of the
battery core. The Al layer also provides the plasticity for punching when the
aluminum-plastic film is formed. See point 3 for details.
PP is the abbreviation of polypropylene. The characteristic of this
material is that it melts at temperatures of more than 100 degrees Celsius and
is sticky. Therefore, the thermal sealing of batteries mainly relies on the PP
layer being melted and bonded together under the action of heating of the
sealing head. Then the sealing head is removed and the temperature is reduced to
solidify and bond.
Aluminum plastic film looks very simple, but in actual practice, it is not
so easy to combine the three layers of materials evenly and firmly together.
Unfortunately, good-quality aluminum-plastic films are basically imported from
Japan. Domestic ones are not available, but the quality still needs to be
improved.
Aluminum plastic film forming process
Soft-packed batteries can be designed into different sizes according to
customer needs. After the outer dimensions are designed, corresponding molds
need to be opened to form the aluminum-plastic film. The molding process is also
called punching (in fact, I personally think it should be "gun pit", but if
everyone writes it this way, just follow the convention), as the name suggests,
it is to use the forming mold to punch out a hole on the aluminum-plastic film
that can be installed under heating. The core pit
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