TECHNICAL FIELD
[0002] The present invention relates to a degassing
apparatus, which discharges a gas generated therein while an
activation process is performed after an electrode assembly
and an electrolyte are inserted into a pouch, and a degassing
method, and more particularly, to a degassing apparatus, in
which at least one more of a lower mold and an upper mold,
which press a pouch, are cooled to increase in viscosity of
an electrolyte, thereby solving a problem, in which the
electrolyte is discharged together when a gas is discharged,
and a degassing method.
BACKGROUND ART
[0003] Recently, with the rapid development of the electric,
electronic, telecommunication and computer industries, the
demand for high performance and high safety batteries is
gradually increasing. Particularly, as electronic devices
are becoming more compact, thinner and lighter, the demands
for miniaturization and thinning of batteries is gradually
increasing. In response to these demands, a lithium
secondary battery with a high energy density is drawing the
most attention.
2
[0004] Lithium batteries have advantages of long lifespan
and large capacity and are widely used in portable electronic
devices. The lithium batteries comprise lithium metal
batteries and lithium ion batteries, which use a liquid
electrolyte, and lithium polymer batteries using a polymer
solid electrolyte depending on types of electrolytes.
[0005] In addition, lithium secondary batteries are
classified into a prismatic battery using a prismatic can, a
cylindrical battery using a cylindrical can, and a pouch-type
battery using a pouch according to types of exteriors that
seal an electrode assembly.
[0006] Among them, the pouch-type battery has advantages
such as higher energy density per unit weight and volume,
enables thinner and lighter battery, as well as a lower
material cost as an exterior, and thus has been actively
developed in recent years.
[0007] In addition, a method for manufacturing a pouch-type
battery using the liquid electrolyte is as follows. First, a
positive electrode and a negative electrode are manufactured,
and then, a separator is disposed between the positive
electrode and the negative electrode, and the positive
electrode, the separator, and the negative electrode are
stacked to manufacture an electrode assembly. Then, the
electrode assembly is inserted together with the electrolyte
into the inside of the pouch.
[0008] Here, as illustrated in FIG. 1, which simply shows a
schematic shape of the degassing apparatus according to the
related art, a pouch 1 is provided with a body part 1a, in
which an electrode assembly and an electrolyte are embedded,
and a gas pocket part 1b, which expands to one side from the
3
body part 1a and of which the inside is opened to allow a gas
to enter and exit. The gas pocket part 1b may be a portion
at which a gas is collected during the degassing process,
i.e., a portion, which is cut and removed when the degassing
is completed. Heat and a pressure are applied to the cut
portions of the gas pocket part 1b and the body part 1a to
seal the cut portions.
[0009] After the electrode assembly is embedded first in the
pouch 1, the electrolyte is injected into the pouch 1 to
impregnate the electrode assembly into the electrolyte. When
the electrolyte is injected as described above, an edge of an
opening, into which the electrode assembly is inserted, is
fused to be bonded, thereby sealing the pouch 1.
[0010] Also, after an aging process is performed for
stabilization, a charging/discharging process is performed to
activate the battery. During the charging/discharging
process, since a gas is generated inside the pouch 1,
degassing is performed to discharge the gas generated therein.
After the degassing process is performed, the gas pocket part
1b is cut and discarded, and the cut portions of the gas
pocket part 1b and the body part 1a are sealed to manufacture
a secondary battery.
[0011] As illustrated in FIG. 1, in the degassing process,
the body part 1a of the pouch 1 is seated on a lower mold 2,
and then, an upper mold 3 descends onto the body part 1a to
press the body part 1a. Here, a negative pressure is applied
to the gas pocket part 1b after an end of a gas inhaler 4 is
inserted into the gas pocket part 1b to suction the gas.
Here, the gas existing in the body part 1a is pushed into the
gas pocket part 1b by the pressure applied to the upper mold
4
3, and thus, the gas moving through the gas inhaler 4 is
discharged from the gas pocket part 1b to the outside.
[0012] However, in the above-described degassing method, a
portion of the electrolyte is discharged together with the
gas according to the amount and viscosity of the electrolyte
injected at the beginning, the descending pressure and
descending speed of the upper mold 3, the suction force of
the gas inhaler 4, and the like.
[0013] Also, when the amount of electrolyte within the body
part 1a decreases below a certain level due to an increase in
discharge amount of electrolyte increases due to the
discharge of the gas, the lifespan of the secondary battery
may be deteriorated, and also, when the discharge amount of
gas is too small, the gas remaining in the body part 1a may
cause swelling.
DISCLOSURE OF THE INVENTION
TECHNICAL PROBLEM
[0014] Accordingly, an object of the present invention is to
provide a degassing apparatus and a degassing method, which
are capable of blocking or minimizing a discharge of an
electrolyte during a degassing process.
TECHNICAL SOLUTION
[0015] The present invention for achieving the above object
provides a degassing method and a degassing apparatus that is
capable of performing the degassing method.
[0016] A degassing method for a pouch that comprises a body
part, on which an electrode assembly is mounted, and into
which an electrolyte is injected, and a gas pocket part
extending from the body part to one side, according to the
present invention comprises: a pouch seating step (S10) of
seating the body part on a lower mold; a pressing step (S30)
5
of allowing an upper mold to descend so as to press the body
part placed on the lower mold; and an inhalation step (S40)
of suctioning a gas by inserting a gas inhaler into the gas
pocket part, wherein, before starting the inhalation step
(S40), a cooling step (S20) of cooling the body part is
performed.
[0017] The cooling step (S20) may be started after the pouch
seating step (S10) and before the pressing step (S30), and an
end of the cooling step (S20) may be adjusted according to a
change in cooling rate and viscosity of the electrolyte.
[0018] The inhalation step (S40) may be started
simultaneously when the cooling step (S20) and the pressing
step (S30) are performed. A negative pressure applied in the
inhalation step (S40) may also be adjusted according to a
change in viscosity of the electrolyte.
[0019] Thus, after the electrolyte is cooled to a
temperature less than a predetermined temperature, the
inhalation step (S40) may be started.
[0020] Also, in the cooling step (S20), a connection point
between the body part and the gas pocket part may be more
quickly cooled than other points. Here, in the cooling step
(S20), the electrolyte may be cooled within a temperature
range in which a change in physical property of the
electrolyte does not occur.
[0021] In addition, the present invention may provide a
degassing apparatus that is capable of performing the abovedescribed
degassing method. A degassing apparatus for a
pouch that comprises a body part, on which an electrode
assembly is mounted, and into which an electrolyte is
injected, and a gas pocket part extending from the body part
6
to one side, according to the present invention comprises: a
lower mold placed on a bottom surface of the body part; and
an upper mold descending to press a top surface of the body
part placed on the lower mold, wherein at least one or more
of the lower mold or the upper mold are cooled by a cooling
member to cool the electrolyte injected into the body part
when being in contact with the body part.
[0022] The degassing apparatus may further comprise a gas
inhaler that is inserted into the gas pocket part to suction
a gas when the lower mold and the upper mold press the body
part.
[0023] The cooling member may comprise a Peltier element
that is cooled when current is applied.
[0024] The Peltier element may be installed on the upper
mold or the lower mold so that a surface of the upper mold or
a surface of the lower mold, which is in contact with the
body part, is more quickly cooled than other portions.
[0025] The Peltier element may be installed on the lower
mold or installed on each of both the upper mold and the
lower mold.
[0026] When the pouch is seated, the Peltier elements
installed on the lower mold may be more densely installed at
a boundary point between the body part and the gas pocket
part than other points.
[0027] When a viscosity of the electrolyte before the
cooling is ‘X’, the cooling device may be configured to cool
the electrolyte until the viscosity of the electrolyte after
the cooling becomes ‘1.5X’ or more. For example, when a
temperature of the electrolyte before the cooling is 20
degrees to 30 degrees, a temperature of the electrolyte after
7
the cooling may be cooled to a temperature of 0 degree to 15
degrees by the cooling device. For example, if the viscosity
is 4.37 Pa.s when a temperature of the electrolyte before the
cooling is 25°C, the cooling may be performed up to a
temperature at which the viscosity is 6.56 Pa.s or more.
[0028] The gas inhaler may suction a gas after the
electrolyte is cooled to a predetermined reference
temperature or more.
ADVANTAGEOUS EFFECTS
[0029] In the present invention having the above
configuration, since the cooling liquid is sufficiently
cooled before the gas is suctioned to increase in viscosity,
the movement of the gas to the gas pocket part may be
suppressed as much as possible to prevent the electrolyte
from being unnecessarily discharged.
[0030] In the present invention, since the cooling of the
electrolyte is adjusted according to the change in cooling
rate and viscosity of the electrolyte, the secondary
batteries having various specifications may be applied.
[0031] In addition, in the present invention, the viscosity
of the electrolyte at the specific point (particularly, the
point that is close to the boundary with the gas pocket part)
may further increase by cooling the specific point more
rapidly, and thus, the amount and speed of the electrolyte
moving to the gas pocket part may be delayed
[0032] In addition, the degassing apparatus according to the
present invention may comprise the Peltier element that is
cooled when the current is applied so that the cooling of the
electrolyte is performed relatively simply and quickly
through the control of the current, and the cooling may be
8
more efficiently controlled according to the viscosity of the
electrolyte.
[0033] Particularly, according to the present invention,
since the Peltier element is used as the cooling member to
more quickly reduce the temperature of the specific part, the
movement of the electrolyte may be delayed more quickly and
efficiently at the portion that serves as the passage when
the gas and the electrolyte flow.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] FIG. 1 is a schematic view illustrating a
configuration of a degassing apparatus according to a related
art.
[0035] FIG. 2 is a flowchart illustrating a degassing method
according to the present invention.
[0036] FIG. 3 is a schematic view illustrating a
configuration of a degassing apparatus according to the
present invention.
[0037] FIG. 4 is a perspective view illustrating an internal
configuration of a Peltier element comprised in the degassing
apparatus according to the present invention.
[0038] FIG. 5 is a cross-sectional view illustrating a state
in which an electrode assembly is inserted into a pouch.
MODE FOR CARRYING OUT THE INVENTION
[0039] Hereinafter, preferred embodiments of the present
invention will be described in detail with reference to the
accompanying drawings in such a manner that the technical
idea of the present invention may easily be carried out by a
person with ordinary skill in the art to which the invention
pertains. The present invention may, however, be embodied in
different forms and should not be construed as limited to the
9
embodiments set forth herein.
[0040] In order to clearly describe the present invention,
parts irrelevant to the description are omitted, and the same
reference numerals are assigned to the same or similar
components throughout the specification.
[0041] Also, terms or words used in this specification and
claims should not be restrictively interpreted as ordinary
meanings or dictionary-based meanings, but should be
interpreted as meanings and concepts conforming to the scope
of the present invention on the basis of the principle that
an inventor can properly define the concept of a term to
describe and explain his or her invention in the best ways.
[0042] The present invention provides a degassing apparatus
for removing a gas in a pouch and a degassing method that is
capable of performing degassing using the degassing apparatus
according to embodiments, respectively. Thus, hereinafter,
the embodiments of the present invention will be described in
more detail with reference to the accompanying drawings.
[0043]
[0044] First embodiment
[0045]
[0046] The present invention provides a degassing method for
removing a gas in a pouch as a first embodiment.
[0047] Referring to FIG. 2 illustrating a flowchart of the
degassing method according to the present invention, the
degassing method according to the present invention relates
to a method for degassing a pouch 10 comprising a body part
10a, on which an electrode assembly is mounted, and into
which an electrolyte is injected, and a gas pocket part 10b
extending from the body part 10a to one side and comprises a
10
pouch seating step (S10), a cooling step (S20), a pressing
step (S30), and an inhalation step (S40).
[0048] The pouch seating step (S10) is a step of seating the
body part 10a on a lower mold 20. As illustrated in FIG. 5
that illustrates a state in which the electrode assembly 11
is inserted into the body part 10a, the pouch 10 is seated on
the lower mold 20 after the electrolyte and the electrode
assembly 11 are embedded in the body part 10a, and then, an
aging process and an activation process are completely
performed.
[0049] After the pouch seating step (S10), the pressing step
(S30) is performed, and the cooling step (S20) is performed
before the pressing step (S30) or during the pressing step
(S30). That is, a start time of the cooling step (S20) may
be different depending on whether a cooling device 50 is
installed on the lower mold 20 or an upper mold 30.
[0050] In the cooling step (S20), the cooling device 50
installed (or connected to be heat-exchanged) on at least one
of the lower mold 20 and the upper mold 30 or both the lower
mold 20 and the upper mold 30 is configured to cool the body
part 10a of the pouch 10. In the pressing step (S30), the
upper mold 30 descends to press the body part 10a placed on
the lower mold 20 at a predetermined pressure.
[0051] Here, if the cooling device 50 is mounted on or
connected to the upper mold 30 before the body part 10a is
cooled to a predetermined temperature, in the pressing step
(S30), a contact step, in which a contact state is maintained
for a certain time without a substantial pressure causing
movement of a gas may be selectively performed so that a
pressure is not applied to the body part 10a, but only heat
11
exchange for the cooling is performed. Also, when the body
part 10a is cooled to a predetermined temperature, the
contact step may be released, and an appropriate pressure may
be applied to cause the movement of the gas in the body part
10a.
[0052] After the pressing step (S30), the inhalation step
(S40) is performed, and the cooling step (S20), in which the
body part 10a is cooled to increase in viscosity of the
electrolyte, may be performed before or after the pressing
step (S30) before the inhalation step (S40).
[0053] In the inhalation step (S40), an end of the gas
inhaler 40 is inserted into the gas pocket part 10b of the
pouch 10 to apply a certain negative pressure, thereby
suctioning the gas. Here, the gas in the body part 10a is in
a state of moving to the gas pocket part 10b through the
pressing step (S30), and the movement of the electrolyte of
which the viscosity increases through the cooling step (S20)
is suppressed in the pressing step (S30), and thus, an amount
of electrolyte moving to the gas inhaler 40 is minimized.
Therefore, the inhalation step (S40) is started after cooling
the electrolyte so that the viscosity of the electrolyte
sufficiently increases.
[0054] As described above, if before the inhalation step
(S40), the cooling step (S20) is possible even after the
pressing step (S30), but if the cooling device 50 is
configured to be disposed on the lower mold 20, it is
preferable that the cooling step (S20) is started after the
pouch seating step (S10) and before the pressing step (S30)
to increase in process rate.
[0055] Also, if the temperature of the electrolyte is
12
sufficiently low in order to increase in process rate, or if
instantaneous cooling is possible according to performance of
the cooling device 50, the inhalation step (S40) may be
started simultaneously when the cooling step (S20) and the
pressing step (S30) are performed.
[0056] Also, the end of the cooling step (S20) may be
adjusted according to the change in cooling rate and
viscosity of the electrolyte, and the negative pressure
acting in the inhalation step (S40) may be adjusted according
to the change in viscosity of the electrolyte. However, in
this embodiment, the inhalation step (S40) may be started
after the electrolyte is cooled to a predetermined
temperature or less, and it is preferable that, in the
cooling step (S20), the electrolyte is cooled within a
temperature range in which a change in physical property of
the electrolyte does not occur.
[0057] Also, in the cooling step ( S20 ), a connection point
between the body part 10a and the gas pocket part 10b may be
cooled faster than other points. That is, as illustrated in
FIG. 5, a temperature at a point B, at which a boundary
between the body part 10a and the gas pocket part 10b of the
pouch 10 is disposed, is further lowered instantaneously to
relatively further increase in viscosity of the electrolyte
disposed at the point, thereby more efficiently decreasing in
amount of electrolyte moving to the gas pocket part 10b.
[0058]
[0059] Second embodiment
[0060]
[0061] The present invention provides a degassing apparatus
for removing a gas in a pouch as a second embodiment.
13
[0062] Referring to FIG. 3 that illustrates a simplified
schematic view of the degassing apparatus according to the
present invention and FIG. 4 that illustrates an internal
configuration of a Peltier element 51 comprised in the
degassing apparatus according to the present invention, the
degassing apparatus according to the present invention
additionally comprises a cooling device when compared to the
degassing apparatus according to the related art.
[0063] That is, the degassing apparatus according to this
embodiment is a degassing apparatus for a pouch 10 comprising
a body part 10a, on which an electrode assembly 11 is mounted,
and into which an electrolyte is injected, and a gas pocket
part 10b extending from the body part 10a to one side. The
degassing apparatus comprises a lower mold 20 placed on a
bottom surface of the body part 10a and an upper mold 30
descending to press a top surface of the body part 10a placed
on the lower mold 20. As illustrated in FIG. 3, at least one
or more of the lower mold 20 or the upper mold 30 may be
connected or coupled to a cooling member 50 so as to be heatexchanged,
or the cooling member is directly mounted on at
least one or more of the lower mold 20 or the upper mold 30
to cool at least one or more of the lower mold 20 or the
upper mold 30.
[0064] Thus, at least one or both of the upper mold 30 or
the lower mold 20 cools the body part 10a when being in
contact with the body part 10a to cool the electrolyte
injected into the body part 10a, and the cooled electrolyte
increases in viscosity in proportion to the decreasing
temperature.
[0065] Furthermore, the degassing apparatus according to
14
this embodiment further comprises a gas inhaler 40 that
suctions a gas by inserting an end of the inhaler 40 into the
gas pocket part 10b when the lower mold 20 and the upper mold
30 press the body part 10a.
[0066] The cooling member 50 is not particularly limited as
long as the cooling member 50 is a device capable of rapidly
performing the cooling, but in the present invention, the
cooling member 50 comprises a Peltier element 51, in which
the cooling is relatively easily controlled by adjusting an
amount of current, and cooling performance is excellent, and
particularly, instantaneous cooling is capable of being
performed.
[0067] The Peltier element 51 may be configured to be cooled
when the current is applied. That is, the Peltier element 51
is an element using a Peltier effect that generates a
temperature difference by generating and absorbing heat at
both sides at the same time when a potential difference
occurs. The Peltier element 51 is configured to have a
cooling effect by taking energy away from one metal in order
that electrons move between two metals, in which the
potential difference occurs. In the Peltier element 51
according to the present invention, a p-type semiconductor 56
and an n-type semiconductor 57 are disposed between two
plates 54 and 55, and when current is applied to the p-type
semiconductor 56 and the n-type semiconductor 57 through
cables 52, 53, energy of one plate 54 is taken away to be
cooled.
[0068] A plurality of Peltier elements 51 may be directly
attached to the lower mold 20 or the upper mold 30 so as to
be cooled or may be heat-exchanged with the lower mold 20 or
15
the upper mold 30 through a refrigerant or the like so as to
be cooled.
[0069] However, in order to improve the cooling efficiency,
it is more preferable that a method in which the plate 54, in
which the cooling is performed, of the Peltier element 51 is
directly attached to the upper mold 30 or the lower mold 20.
[0070] Furthermore, the degassing apparatus according to
this embodiment may be configured so that a specific portion
of the body part 10a is cooled more rapidly. That is, the
plurality of the Peltier elements 51 may be arranged at
regular intervals on a surface of the upper mold 30 or a
surface of the lower mold 20, which is in contact with the
body part 10a. Here, the Peltier element having a larger
output at a specific portion B may be disposed to more
quickly cool the specific portion of the body part 10a than
other portions, or the Peltier elements 51 are disposed more
densely at the specific portion to more quickly cool the
specific portion (for example, a portion ‘B’ in FIG. 5) of
the body part 10a.
[0071] The Peltier element 51 may be installed only on any
one of the lower mold 20 and the upper mold 30, but it is
preferable to be installed on both the upper mold 30 and the
lower mold 20 so as to perform the rapid cooling. Also, if
the Peltier element 51 has to be installed on only one place,
it is more preferable to be installed on the lower mold 20
having a relatively longer contact time with the body part
10a than to be installed on the upper mold 30.
[0072] In this embodiment, when the viscosity of the
electrolyte before the cooling is ‘X’, the cooling device 50
may be configured to cool the electrolyte until the viscosity
16
of the electrolyte after the cooling becomes ‘1.5X’ or more.
[0073] For example, when a temperature of the electrolyte
before the cooling is 20 degrees to 30 degrees, a temperature
of the electrolyte after the cooling may be cooled to a
temperature of 0 degree to 15 degrees by the cooling device
50. For example, if the viscosity is 4.37 Pa.s when a
temperature of the electrolyte before the cooling is 25°C,
the cooling may be performed up to a specific temperature at
which the viscosity is 6.56 Pa.s or more.
[0074] For reference, the electrolyte may have a viscosity
of 6.80 Pa.s at a temperature of 10°C. That is, when the
electrolyte is cooled by a temperature of 15°C (from 20°C to
15°C), the viscosity increases by approximately 56%. When
the electrolyte is pressed, since the movement of the
electrolyte solution having the increasing viscosity is
reduced when compared to a case in which the temperature is
relatively high. Thus, the movement of the electrolyte to
the gas pocket part 10b of the pouch 10 may be prevented.
[0075] In the present invention, the gas inhaler 40 may
suction a gas after the temperature of the electrolyte is
cooled to a predetermined reference temperature or more, and
the end of the gas inhaler 40 may be inserted into the gas
pocket part 10b before cooling the electrolyte. However, it
is preferable to be configured so that the end of the gas
inhaler 40 is inserted after cooling the electrolyte as much
as possible.
[0076]
[0077] In the present invention having the above
configuration, since the cooling liquid is sufficiently
cooled before the gas is suctioned to increase in viscosity,
17
the movement of the gas to the gas pocket part 10b may be
suppressed as much as possible to prevent the electrolyte
from being unnecessarily discharged.
[0078] In the present invention, since the cooling of the
electrolyte is adjusted according to the change in cooling
rate and viscosity of the electrolyte, the secondary
batteries having various specifications may be applied.
[0079] In addition, in the present invention, the viscosity
of the electrolyte at the specific point (particularly, the
point that is close to the boundary with the gas pocket part
10b) may further increase by cooling the specific point more
rapidly, and thus, the amount and speed of the electrolyte
moving to the gas pocket part 10b may be delayed
[0080] In addition, the degassing apparatus according to the
present invention may comprise the Peltier element 51 that is
cooled when the current is applied so that the cooling of the
electrolyte is performed relatively simply and quickly
through the control of the current, and the cooling may be
more efficiently controlled according to the viscosity of the
electrolyte.
[0081] While the embodiments of the present invention have
been described with reference to the specific embodiments, it
will be apparent to those skilled in the art that various
changes and modifications may be made without departing from
the spirit and scope of the invention as defined in the
following claims.
[0082]
[0083] [Description of the Symbols]
[0084] 10: Pouch (10a: body part, 10b: Gas pocket part)
[0085] 20: Lower mold
18
[0086] 30: Upper mold
[0087] 40: Gas inhaler
[0088] 50: Cooling device

CLAIMS
1. A degassing apparatus for a pouch that comprises
a body part, on which an electrode assembly is mounted, and
into which an electrolyte is injected, and a gas pocket part
extending from the body part to one side, the degassing
apparatus comprising:
a lower mold placed on a bottom surface of the body
part; and
an upper mold descending to press a top surface of the
body part placed on the lower mold,
wherein at least one of the lower mold and the upper
mold are cooled by a cooling member to cool the electrolyte
injected into the body part when being in contact with the
body part.
2. The degassing apparatus of claim 1, further
comprising a gas inhaler that is inserted into the gas pocket
part to suction a gas when the lower mold and the upper mold
press the body part.
3. The degassing apparatus of claim 2, wherein the
cooling member comprises a Peltier element that is cooled
when current is applied.
4. The degassing apparatus of claim 3, wherein the
Peltier element is installed on the upper mold or the lower
mold so that a surface of the upper mold or a surface of the
lower mold, which is in contact with the body part, is more
quickly cooled than other portions.
20
5. The degassing apparatus of claim 4, wherein the
Peltier element is installed on the lower mold or installed
on each of both the upper mold and the lower mold.
6. The degassing apparatus of claim 5, wherein, when
the pouch is seated, the Peltier elements installed on the
lower mold are more densely installed at a boundary point
between the body part and the gas pocket part than other
points.
7. The degassing apparatus of claim 2, wherein, when
a viscosity of the electrolyte before the cooling is ‘X’, the
cooling device is configured to cool the electrolyte until
the viscosity of the electrolyte after the cooling becomes
‘1.5X’ or more.
8. The degassing apparatus of claim 5, wherein a
temperature of the electrolyte before the cooling is 20
degrees to 30 degrees, and a temperature of the electrolyte
after cooled by the cooling device is 0 degree to 15 degrees.
9. The degassing apparatus of claim 5, wherein the
gas inhaler suctions a gas after the electrolyte is cooled to
a predetermined reference temperature or more.
10. A degassing method for a pouch that comprises a
body part, on which an electrode assembly is mounted, and
into which an electrolyte is injected, and a gas pocket part
extending from the body part to one side, the degassing
21
method comprising:
a pouch seating step (S10) of seating the body part on
a lower mold;
a pressing step (S30) of allowing an upper mold to
descend so as to press the body part placed on the lower
mold; and
an inhalation step (S40) of suctioning a gas by
inserting a gas inhaler into the gas pocket part,
wherein, before starting the inhalation step (S40), a
cooling step (S20) of cooling the body part is performed.
11. The degassing method of claim 10, wherein the
cooling step (S20) is started after the pouch seating step
(S10) and before the pressing step (S30).
12. The degassing method of claim 11, wherein the
inhalation step (S40) is started during the cooling step
(S20) and the pressing step (S30).
13. The degassing method of claim 12, wherein, after
the electrolyte is cooled to a temperature less than a
predetermined temperature, the inhalation step (S40) is
started.
14. The degassing method of claim 11, wherein, in the
cooling step (S20), a connection point between the body part
and the gas pocket part is more quickly cooled than other
points.
15. The degassing method of claim 11, wherein, in the
22
cooling step (S20), the electrolyte is cooled within a
temperature range in which a change in physical property of
the electrolyte does not occur.