Residual gas discharge device for pouch-type secondary battery

Abstract

The disclosed residual gas discharge device for a pouch-type secondary battery comprises a gas discharge member. The gas discharge member comprises a gas discharge pipe, a gas discharge cylinder, and a gas discharge piston. Therefore, it is possible to remove residual gas remaining in the pouch of a pouch-type secondary battery without being equipped with a vacuum chamber and a vacuum pump.

Description

Residual gas discharge device for pouch-type secondary batteries

[0001] The present invention relates to a residual gas discharge device for a pouch-type secondary battery.

[0002] A pouch-type secondary battery is formed in a pouch type and can perform multiple charging and discharging cycles. An example of such a pouch-type secondary battery may be Republic of Korea Patent Publication No. 10-2020-0109147 (publication date: 2020.09.22., title of the invention: Pouch-type secondary battery and battery module including the same).

[0003] During the manufacturing process of the above pouch-type secondary battery, a large amount of residual gas is generated inside the pouch of the above pouch-type secondary battery, and this residual gas must be discharged and removed.

[0004] However, in the past, in order to remove the residual gas from the pouch, a method was used in which the pouch-type secondary battery was placed in a vacuum chamber and the inside of the vacuum chamber was made vacuum using a vacuum pump. However, this method had the problem of requiring expensive vacuum chambers and vacuum pumps.

[0005] The purpose of the present invention is to provide a residual gas discharge device for a pouch-type secondary battery that can remove residual gas remaining inside a pouch of a pouch-type secondary battery without having a vacuum chamber and a vacuum pump.

[0006] A residual gas discharge device for a pouch-type secondary battery according to one aspect of the present invention is for removing residual gas remaining in a pouch of a pouch-type secondary battery during a manufacturing process of the pouch-type secondary battery.

[0007] A gas discharge member including a gas discharge pipe into which a front portion is inserted into the pouch, a gas discharge cylinder connected to the gas discharge pipe, and a gas discharge piston that forms a negative pressure inside the gas discharge cylinder while moving inside the gas discharge cylinder;

[0008] When the gas discharge piston moves while the front part of the gas discharge pipe is inserted into the pouch and a negative pressure is formed in the gas discharge cylinder, the residual gas inside the pouch is discharged through the gas discharge pipe.

[0009] A residual gas discharge device for a pouch-type secondary battery according to another aspect of the present invention is for removing residual gas remaining in a pouch of a pouch-type secondary battery during a manufacturing process of the pouch-type secondary battery.

[0010] A gas discharge member including a gas discharge pipe into which a front portion is inserted into the pouch, a gas discharge cylinder connected to the gas discharge pipe, and a negative pressure forming pump that forms negative pressure inside the gas discharge cylinder;

[0011] When the negative pressure forming pump is operated while the front side of the gas discharge pipe is inserted into the pouch and negative pressure is formed in the gas discharge cylinder, the residual gas inside the pouch is discharged through the gas discharge pipe.

[0012] According to a residual gas discharge device for a pouch-type secondary battery according to one aspect of the present invention, the residual gas discharge device for a pouch-type secondary battery includes a gas discharge member, and since the gas discharge member includes a gas discharge pipe, a gas discharge cylinder, and a gas discharge piston, there is an effect that the residual gas remaining inside the pouch of the pouch-type secondary battery can be removed without having a vacuum chamber and a vacuum pump.

[0013] FIG. 1 is a perspective view showing a gas discharge member and a pouch constituting a residual gas discharge device for a pouch-type secondary battery according to one embodiment of the present invention.

[0014] FIG. 2 is a cross-sectional view of a gas discharge member constituting a residual gas discharge device for a pouch-type secondary battery according to one embodiment of the present invention.

[0015] Figure 3 is an enlarged view of part A shown in Figure 2.

[0016] FIG. 4 is a bottom view of a gas discharge pipe and a surface-adhering member constituting a gas discharge member in one embodiment of the present invention.

[0017] Figure 5 is a schematic drawing showing components of a residual gas discharge device for a pouch-type secondary battery according to one embodiment of the present invention.

[0018] FIG. 6 is a drawing of a gas discharge member constituting a residual gas discharge device for a pouch-type secondary battery according to another embodiment of the present invention.

[0019] Figure 7 is an enlarged view of a portion of a gas discharge member in another embodiment of the present invention.

[0020] Hereinafter, a residual gas discharge device for a pouch-type secondary battery according to embodiments of the present invention will be described with reference to the drawings.

[0021] FIG. 1 is a perspective view showing a gas discharge member and a pouch constituting a residual gas discharge device for a pouch-type secondary battery according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a gas discharge member constituting a residual gas discharge device for a pouch-type secondary battery according to an embodiment of the present invention, FIG. 3 is an enlarged view of part A shown in FIG. 2, FIG. 4 is a bottom view of a gas discharge pipe and a surface-adhering member constituting a gas discharge member according to an embodiment of the present invention, and FIG. 5 is a schematic view showing components of a residual gas discharge device for a pouch-type secondary battery according to an embodiment of the present invention.

[0022] Referring to FIGS. 1 to 5 together, a residual gas discharge device (50) for a pouch-type secondary battery according to the present embodiment is for removing residual gas remaining in a pouch of a pouch-type secondary battery (10) during a manufacturing process of the pouch-type secondary battery (10), and includes a gas discharge member (100).

[0023] In addition, the residual gas discharge device (50) for the pouch-type secondary battery may further include an external air blocking member (160), a roller member (165), and an ultrasonic application member (150).

[0024] The above pouch-type secondary battery (10) includes a pouch body (30) in which components such as a positive electrode, a negative electrode, and a separator are accommodated inside, and a pouch end portion (20) formed in a form in which the pouch extends along the outer periphery of the pouch body (30).

[0025] The above gas discharge member (100) discharges the remaining gas remaining in the pouch to the outside of the pouch, and includes a gas discharge pipe (130), a gas discharge cylinder (110), and a gas discharge piston (120).

[0026] The above gas discharge pipe (130) is formed in the shape of a thin and long probe and is inserted into the pouch body (30) through the end portion (20) of the pouch so that its front portion is inserted into the pouch.

[0027] The above pouch end portion (20) is formed by overlapping two pouch films (aluminum films), so the gas discharge pipe (130) is inserted into the gap between the two pouch films of the above pouch end portion (20).

[0028] The above gas discharge pipe (130) is formed in a cross-sectional shape of a leaded ellipse, so that it can be easily inserted into the end portion (20) of the pouch.

[0029] The above gas discharge cylinder (110) is connected to the gas discharge pipe (130) and is hollow inside.

[0030] The above gas discharge cylinder (110) includes a cylinder body (111) formed in the shape of a circular cylinder with an interior that is hollow, a cylinder front cover (112) that blocks the front end of the cylinder body (111) and is connected so that the gas discharge pipe (130) passes through it, and a cylinder rear cover (113) that blocks the rear end of the cylinder body (111) and has the gas discharge piston (120) pass through it.

[0031] The above gas discharge piston (120) moves within the gas discharge cylinder (110) to form negative pressure inside the gas discharge cylinder (110).

[0032] When the gas discharge piston (120) moves backward while the front side of the gas discharge pipe (130) is inserted into the pouch, specifically, the end of the pouch (20), and a negative pressure is formed in the gas discharge cylinder (110), a negative pressure is also applied inside the pouch through the gas discharge pipe (130), and the remaining gas inside the pouch is discharged through the gas discharge pipe (130) and flows into the inside of the gas discharge cylinder (110).

[0033] In this embodiment, the size of the gas discharge cylinder (110) is formed in the range of 150 to 2500 ml.

[0034] In detail, the pressure and volume of the residual gas remaining in the pouch are 760 torr and 10 to 200 ml, and the pressure inside the pouch with the residual gas removed is 50 torr. Therefore, when applying this to the gas equation below, the internal volume, i.e., the size, of the gas discharge cylinder (110) required to lower the pressure inside the pouch from 760 torr to 50 torr is formed in the range of 150 to 2500 ml.

[0035]

[0036] PV = nRT

[0037] (P: pressure, V: volume, n: number of moles of gas, R: gas constant, T: temperature)

[0038] Here, since the temperature inside the pouch, which is a closed system, is constant, n, R, and T become constants.

[0039]

[0040] The above gas discharge member (100) may further include a pressure detection sensor (145).

[0041] The above pressure detection sensor (145) is installed in either the gas discharge pipe (130) or the gas discharge cylinder (110) to detect the pressure of the residual gas introduced into the gas discharge cylinder (110) through the gas discharge pipe (130).

[0042] The above pressure detection sensor (145) can be installed on the front wall of the inner wall of the gas discharge cylinder (110) through which the gas discharge pipe (130) passes.

[0043] In this embodiment, the speed of movement of the gas discharge piston (120) is controlled according to the pressure of the residual gas detected by the pressure detection sensor (145), thereby controlling the speed of discharge of the residual gas from the pouch.

[0044] By controlling the speed of movement of the gas discharge piston (120) so that the pressure of the residual gas is lower than a preset allowable pressure, and thereby controlling the speed of discharge of the residual gas from the pouch, the electrolyte can be prevented from leaking together with the discharge of the residual gas inside the pouch.

[0045] The above gas discharge member (100) may further include a leak detection sensor (140).

[0046] The above leakage detection sensor (140) is installed in either the gas discharge pipe (130) or the gas discharge cylinder (110) to detect whether the electrolyte inside the pouch leaks through the gas discharge pipe (130).

[0047] The above-mentioned leak detection sensor (140) can be installed on the front wall of the inner wall of the gas discharge cylinder (110) through which the gas discharge pipe (130) passes.

[0048] In this embodiment, when the leakage detection sensor (140) detects that the electrolyte inside the pouch is leaking, the movement of the gas discharge piston (120) is stopped to stop the discharge of the remaining gas from the pouch, thereby preventing leakage of the electrolyte.

[0049] The above gas discharge member (100) may further include a surface adhesion member (135).

[0050] The surface-adhering member (135) can be elastically deformed to seal the gas discharge pipe (130) and the pouch by wrapping the outer surface of the gas discharge pipe (130) so that the gas discharge pipe (130) and the pouch are in close contact with each other.

[0051] The above surface adhesion member (135) is made of an elastic material such as rubber or silicone and is thus capable of elastic deformation.

[0052] The above surface sealing member (135) includes a pipe outer sealing member (136) that surrounds the outer surface of the gas discharge pipe (130) made of a solid metal material such as stainless steel, and a pipe outer reinforcing member (137) that is connected to the pipe outer sealing member (136) and reinforces the outer portion where the gas discharge pipe (130) extends from the gas discharge cylinder (110).

[0053] When the gas discharge pipe (130) is inserted into the pouch end portion (20), and the pouch end portion (20) and the gas discharge pipe (130) are pressed together by the external air blocking member (160), etc., the tube outer sealing member (136) is pressed and elastically deformed, so that the gas discharge pipe (130) and the pouch end portion (20) can be sealed by the tube outer sealing member (136).

[0054] Meanwhile, the gas discharge member (100) further includes a gas discharge unit (115) that discharges the remaining gas remaining inside the gas discharge cylinder (110) separated from the pouch to the outside of the gas discharge cylinder (110).

[0055] The above gas discharge unit (115) can be placed in the gas discharge cylinder (110) toward the gas discharge pipe (130).

[0056] The above gas discharge unit (115) may be provided as an opening / closing plug that opens / closes a gas discharge port formed through the gas discharge cylinder (110). In this case, when the opening / closing plug is separated from the gas discharge port by an external force such as from a worker, the gas discharge port is opened, allowing the remaining gas remaining inside the gas discharge cylinder (110) to be discharged to the outside of the gas discharge cylinder (110).

[0057] In addition, the gas discharge unit (115) may be provided as a gas discharge opening / closing valve installed in the gas discharge port formed through the gas discharge cylinder (110). In this case, when the gas discharge opening / closing valve is opened by an external force such as an operator, the gas discharge port is opened so that the remaining gas remaining inside the gas discharge cylinder (110) can be discharged to the outside of the gas discharge cylinder (110).

[0058] As described above, as the gas discharge unit (115) is arranged, the residual gas that has flowed in from the pouch and remained inside the gas discharge cylinder (110) can be discharged to the outside of the gas discharge cylinder (110), and accordingly, the residual gas can be efficiently removed from another pouch of the gas discharge member (100).

[0059] The above external air blocking member (160) presses the portion of the pouch into which the gas discharge pipe (130) is inserted so that external air is blocked from entering the pouch when the residual gas inside the pouch is discharged by the gas discharge member (100).

[0060] In detail, the external air blocking member (160) includes an external air blocking pressurizing body (161) that presses the outer end of the pouch (20) with the gas discharge pipe (130) inserted therein, and an external air blocking pressurizing means (162) such as a hydraulic cylinder that can move the external air blocking pressurizing body (161) toward the pouch end (20).

[0061] When the pouch-type secondary battery (10) is placed on a table member (150) of a certain area, the external air blocking pressurizing means (162) is operated to lower the external air blocking pressurizing body (161), and the pouch end (20) is pressed by the external air blocking pressurizing body (161), the gas discharge pipe (130) and the pouch end (20) can be automatically sealed together with the elastic deformation of the tube outer sealing body (136).

[0062] The roller member (165) presses the pouch, specifically the pouch body (30), from the outside to promote discharge of the residual gas inside the pouch when the gas discharge member (100) discharges the residual gas inside the pouch.

[0063] In detail, the roller member (165) includes a rotation roller (166) that moves on top of the pouch-type secondary battery (10) placed on the table member (150) and presses the pouch-type secondary battery (10), and a roller moving means (167) such as a hydraulic cylinder that can move the rotation roller (166) along the upper surface of the table member (150).

[0064] When configured as above, the roller member (165) presses the pouch-type secondary battery (10), so that the residual gas attached to each component of the pouch-type secondary battery (10) can be separated and removed from each component of the pouch-type secondary battery (10).

[0065] The above ultrasonic application member (150) applies ultrasonic waves to the pouch so as to separate the residual gas adsorbed on the components inside the pouch and promote discharge of the residual gas inside the pouch.

[0066] The above ultrasonic applying member (150) may be installed on the inside, bottom, etc. of the table member (150) that does not directly contact the pouch, and may apply ultrasonic waves to the table member (150) to indirectly transmit the ultrasonic waves to the pouch, or may be installed directly on the table member (150) to directly transmit the ultrasonic waves to the pouch.

[0067] Drawing number 170 is an electrolyte receiving container that receives the electrolyte finely deposited on the end of the gas discharge pipe (130) for recycling.

[0068] When some of the electrolyte is stuck to the end of the gas discharge pipe (130), and the gas discharge pipe (130) is directed toward the electrolyte receiving tank (170), and the gas discharge piston (120) is quickly inserted into the gas discharge cylinder (110) at a constant speed, the electrolyte that is stuck to the end of the gas discharge pipe (130) is collected in the electrolyte receiving tank (170) and can be recycled.

[0069] When configured as above, the gas discharge pipe (130) is inserted into a gap formed by opening a portion of the pouch end portion (20), and the external air blocking member (160) presses the portion of the pouch into which the gas discharge pipe (130) is inserted, and the gas discharge piston (120) rises, so that the remaining gas remaining inside the pouch-type secondary battery (10) flows into the inside of the gas discharge cylinder (110) through the gas discharge pipe (130) and can be discharged from the pouch-type secondary battery (10).

[0070] After the removal of the residual gas is completed as described above, the gas discharge pipe (130) is separated from the pouch end (20), the pouch end (20) is sealed again, and then the compression by the external air blocking member (160) is released.

[0071] As described above, since the residual gas discharge device (50) for the pouch-type secondary battery includes the gas discharge member (100), and the gas discharge member (100) includes the gas discharge pipe (130), the gas discharge cylinder (110), and the gas discharge piston (120), it is possible to remove the residual gas remaining inside the pouch of the pouch-type secondary battery (10) without having a vacuum chamber and a vacuum pump.

[0072] Hereinafter, a residual gas discharge device for a pouch-type secondary battery according to another embodiment of the present invention will be described with reference to the drawings. In performing this description, any description that overlaps with the content already described in the above-described embodiment of the present invention will be omitted here.

[0073] FIG. 6 is a drawing of a gas discharge member constituting a residual gas discharge device for a pouch-type secondary battery according to another embodiment of the present invention.

[0074] Referring to FIG. 6, in the present embodiment, the gas discharge member (200) includes a negative pressure forming pump (201) together with a gas discharge pipe (230) and a gas discharge cylinder (210).

[0075] The above negative pressure forming pump (201) forms negative pressure inside the gas discharge cylinder (210), and a general vacuum pump can be presented as an example.

[0076] The above negative pressure forming pump (201) and the gas discharge cylinder (210) are connected by a connecting pipe (202).

[0077] In this embodiment, the gas discharge piston may be omitted from the gas discharge cylinder (210).

[0078] When the negative pressure forming pump (201) is operated while the front part of the gas discharge pipe (230) is inserted into a pouch requiring removal of residual gas, and negative pressure is formed in the gas discharge cylinder (210), the residual gas inside the pouch can be discharged through the gas discharge pipe (230).

[0079] Hereinafter, a residual gas discharge device for a pouch-type secondary battery according to another embodiment of the present invention will be described with reference to the drawings. In performing this description, any description that overlaps with the content already described in the above-described one embodiment of the present invention and the above-described other embodiments of the present invention will be omitted here.

[0080] FIG. 7 is an enlarged view of a portion of a gas discharge member in another embodiment of the present invention.

[0081] Referring to FIG. 7, in the present embodiment, the gas discharge member further includes a pouch adsorption unit (380) that adsorbs the inner surface of the pouch, which faces the outer surface of the tube outer sealing member (336), to the outer surface of the tube outer sealing member (336) when residual gas is discharged through the gas discharge pipe (330) inserted into the pouch, and a gas leakage prevention unit (390) that prevents the residual gas that has moved to the gas discharge cylinder from being arbitrarily discharged through the gas discharge pipe (330) when the discharge of the residual gas is completed and the gas discharge pipe (330) is separated from the pouch.

[0082] In detail, the above pouch adsorption part (380) includes a discharge pipe penetration hole (381), a triangular pyramid-shaped sealing body recessed hole (382), a recessed extension hole (383), an adsorption expansion hole (384), a recessed discharge pipe communication pipe (385), an elastic deformation blocking panel (386), and a triangular pyramid-shaped protrusion (387).

[0083] The above pouch adsorption part (380) may be composed of a single piece or may be composed of a pair and arranged symmetrically to each other.

[0084] The above discharge pipe penetration hole (381) is formed by cutting and penetrating a portion of the gas discharge pipe (330).

[0085] When the above pouch adsorption portion (380) is configured as a pair, the discharge pipe penetration holes (381) can be formed as a pair symmetrically to each other in the gas discharge pipe (330).

[0086] The above triangular pyramid-shaped sealing body recessed hole (382) is formed in the inner surface of the pipe outer sealing body (336) in a triangular pyramid shape so as to communicate with the discharge pipe penetration hole (381).

[0087] The above-mentioned sunken extension hole (383) penetrates the pipe outer seal (336) from the top of the triangular pyramid-shaped seal hole (382) toward the outer surface of the pipe outer seal (336).

[0088] The above adsorption enlargement hole (384) is connected to the above sunken extension hole (383) and is formed in a curved shape with the outer surface of the pipe outer sealing member (336) sunken in a curved shape with a certain area wider than the above sunken extension hole (383).

[0089] The above-mentioned sunken discharge pipe communication pipe (385) extends from the side of the triangular pyramid-shaped sealing body sunken hole (382) at a position spaced apart from the sunken extension hole (383) to connect the inner surface of the gas discharge pipe (330) and the triangular pyramid-shaped sealing body sunken hole (382).

[0090] Since the above-mentioned sunken discharge pipe communication pipe (385) is formed at a position spaced apart from the top of the above-mentioned triangular pyramid-shaped sealing body sunken hole (382) on the side of the above-mentioned triangular pyramid-shaped sealing body sunken hole (382), the above-mentioned sunken discharge pipe communication pipe (385) and the above-mentioned sunken extension hole (383) can be formed in a separate form.

[0091] The above elastic deformation blocking panel (386) is formed in the form of a panel that blocks across the discharge pipe penetration hole (381) and is made of an elastically deformable material such as rubber, so that it can be elastically deformed to bend toward the inside of the gas discharge pipe (330) by negative pressure applied to the inside of the gas discharge pipe (330).

[0092] When no negative pressure is applied to the inside of the gas discharge pipe (330), the elastic deformation blocking panel (386) is maintained in a flat panel shape so as to cross the discharge pipe penetration hole (381), and when negative pressure is applied to the inside of the gas discharge pipe (330), the elastic deformation blocking panel (386) is elastically deformed to bend toward the inside of the gas discharge pipe (330) due to the negative pressure applied to the inside of the gas discharge pipe (330) and protrudes from the discharge pipe penetration hole (381) toward the inside of the gas discharge pipe (330).

[0093] The above triangular pyramid-shaped protrusion (387) protrudes from the elastic deformation blocking panel (386) and is formed in a triangular pyramid shape so as to be insertable into the triangular pyramid-shaped sealing body recessed hole (382), thereby blocking the triangular pyramid-shaped sealing body recessed hole (382) so that the recessed extension hole (383) and the recessed discharge pipe communication pipe (385) are not in communication with each other, and when the elastic deformation blocking panel (386) is elastically deformed to bend toward the inside of the gas discharge pipe (330) due to the negative pressure applied to the inside of the gas discharge pipe (330), it is detached from the triangular pyramid-shaped sealing body recessed hole (382) so that the recessed extension hole (383) and the recessed discharge pipe communication pipe (385) are in communication with each other.

[0094] Meanwhile, the gas leak prevention unit (390) includes an inner wall connecting member (391), a central extension member (392), a one-sided inclined member (393), and a other-sided inclined member (394).

[0095] The above inner wall connector (391) is fixed to the inner wall of the gas discharge pipe (330).

[0096] The above central extension member (392) extends from the inner wall connecting member (391) toward the inner center of the gas discharge pipe (330).

[0097] The above-mentioned one-sided inclined body (393) extends from the central extension body (392) in an inclined manner toward one side of the inner surface of the gas discharge pipe (330) so as to block the inner half of the gas discharge pipe (330).

[0098] The above-mentioned lateral slope (394) extends slantedly from the central extension (392) toward the other side of the inner surface of the gas discharge pipe (330) so as to block the remaining inner half of the gas discharge pipe (330) other than the portion blocked by the lateral slope (393).

[0099] Drawing numbers 395 and 396 are one end and the other end, respectively, extending from the ends of the one-sided inclined body (393) and the other-sided inclined body (394) and coming into close contact with the respective inner surfaces of the gas discharge pipe (330).

[0100] The one-sided inclined body (393) and the other-sided inclined body (394) are made of an elastically deformable material such as rubber, so that when no negative pressure is applied to the inside of the gas discharge pipe (330), the one-sided inclined body (393) and the other-sided inclined body (394) are spread apart in a V shape to block the inside of the gas discharge pipe (330), and when negative pressure is applied to the inside of the gas discharge pipe (330), the one-sided inclined body (393) and the other-sided inclined body (394) are elastically deformed to close to each other due to the negative pressure applied to the gas discharge pipe (330) and the flow pressure of the residual gas flowing in through the gas discharge pipe (330) from the pouch, and accordingly, the inside of the gas discharge pipe (330) becomes a state in which the residual gas can flow.

[0101] In a state where no negative pressure is applied to the inside of the gas discharge pipe (330), the elastic deformation blocking panel (386) is maintained in a flat panel shape so as to cross the discharge pipe penetration hole (381), and the triangular pyramidal protrusion (387) is maintained in a state of blocking the triangular pyramidal sealing body recessed hole (382), so that the recessed extension hole (383) and the recessed discharge pipe communication pipe (385) are maintained in a non-communicating state where they are not connected to each other by the triangular pyramidal protrusion (387). At this time, the one-sided inclined body (393) and the other-sided inclined body (394) are separated from each other in a V shape to maintain a state of blocking the inside of the gas discharge pipe (330).

[0102] Then, when a negative pressure is applied to the inside of the gas discharge pipe (330), the elastic deformation blocking panel (386) is elastically deformed to bend toward the inside of the gas discharge pipe (330) due to the negative pressure applied to the inside of the gas discharge pipe (330) and protrudes from the discharge pipe penetration hole (381) toward the inside of the gas discharge pipe (330), thereby causing the triangular pyramid-shaped protrusion (387) to detach from the triangular pyramid-shaped sealing body recessed hole (382), and accordingly, the recessed extension hole (383) and the recessed discharge pipe communication pipe (385) are connected to each other through the triangular pyramid-shaped sealing body recessed hole (382). Then, due to the negative pressure applied to the gas discharge pipe (330), negative pressure is sequentially applied to the sunken discharge pipe connecting pipe (385), the sunken extension hole (383), and the adsorption enlargement hole (384), and accordingly, the inner surface of the pouch facing the adsorption enlargement hole (384) is adsorbed to the adsorption enlargement hole (384), so that the inner surface of the pouch facing the outer surface of the tube outer sealing member (336) and the outer surface of the tube outer sealing member (336) are adhered to each other, so that random inflow of external air through the space between the pouch and the tube outer sealing member (336) during the process of removing the residual gas can be prevented. At this time, the one-sided inclined body (393) and the other-sided inclined body (394) are elastically deformed to come close to each other due to the negative pressure applied to the gas discharge pipe (330) and the flow pressure of the residual gas, thereby opening the gas discharge pipe (330), thereby allowing the residual gas in the pouch to flow toward the gas discharge cylinder through the gas discharge pipe (330).

[0103] Then, when the discharge of the residual gas is completed and the negative pressure applied to the gas discharge pipe (330) is relieved, the elastic deformation blocking panel (386) returns to its original shape by its own restoring force, so that the triangular pyramid-shaped protrusion (387) blocks the triangular pyramid-shaped sealing body recessed hole (382) again, so that the recessed extension hole (383) and the recessed discharge pipe communicating pipe (385) become non-communicating with each other again. Then, the pouch and the pipe outer sealing body (336) are separated from each other, so that the gas discharge pipe (330) can be easily detached from the pouch. At this time, the one-sided inclined body (393) and the other-sided inclined body (394) also return to their original shape by their own restoring force and the pressure of the residual gas moved to the gas discharge cylinder, so that the one-sided inclined body (393) and the other-sided inclined body (394) block the gas discharge pipe (330) again, and accordingly, the residual gas moved to the gas discharge cylinder is prevented from arbitrarily flowing out through the gas discharge pipe (330).

[0104] While the present invention has been illustrated and described above with respect to specific embodiments, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as set forth in the following claims. However, it is to be made clear that all such modifications and variations are within the scope of the present invention.

[0105] According to a residual gas discharge device for a pouch-type secondary battery according to one aspect of the present invention, residual gas remaining inside a pouch of a pouch-type secondary battery can be removed without having a vacuum chamber and a vacuum pump, and therefore, it is said that the industrial applicability thereof is high.

Claims

1. To remove residual gas remaining inside the pouch of the pouch-type secondary battery during the manufacturing process of the pouch-type secondary battery. A gas discharge tube inserted into the front side of the above pouch, A gas discharge cylinder connected to the above gas discharge pipe, A gas discharge member including a gas discharge piston that forms a negative pressure inside the gas discharge cylinder while moving within the gas discharge cylinder; A residual gas discharge device for a pouch-type secondary battery, characterized in that when the gas discharge piston is moved while the front side of the gas discharge pipe is inserted into the pouch and negative pressure is formed in the gas discharge cylinder, the residual gas inside the pouch is discharged through the gas discharge pipe.

2. In paragraph 1, The above gas discharge member Further comprising a pressure detection sensor installed in one of the gas discharge pipe and the gas discharge cylinder to detect the pressure of the residual gas introduced into the interior of the gas discharge cylinder through the gas discharge pipe, A residual gas discharge device for a pouch-type secondary battery, characterized in that the discharge speed of the residual gas from the pouch is controlled by controlling the movement speed of the gas discharge piston according to the pressure of the residual gas detected by the pressure detection sensor.

3. In paragraph 1, The above gas discharge member Further comprising a leak detection sensor installed in one of the gas discharge pipe and the gas discharge cylinder to detect whether the electrolyte inside the pouch leaks through the gas discharge pipe; A residual gas discharge device for a pouch-type secondary battery, characterized in that when the leakage detection sensor detects that the electrolyte inside the pouch is leaking, movement of the gas discharge piston is stopped to stop discharge of the residual gas from the pouch.

4. In paragraph 1, The above gas discharge pipe has an elliptical cross-sectional shape, The above gas discharge member A residual gas discharge device for a pouch-type secondary battery, characterized in that it further includes a surface-adhesive member that can be elastically deformed to seal the gas discharge pipe and the pouch by wrapping the exterior of the gas discharge pipe so that the gas discharge pipe and the pouch are in close contact with each other.

5. In paragraph 1, The above pouch-type secondary battery residual gas discharge device is An external air blocking member that presses the portion of the pouch into which the gas discharge pipe is inserted so that external air is blocked from entering the pouch when the residual gas inside the pouch is discharged by the gas discharge member; and A residual gas discharge device for a pouch-type secondary battery, characterized in that it further includes a roller member that presses the pouch from the outside to promote discharge of the residual gas inside the pouch when the residual gas inside the pouch is discharged by the gas discharge member.

6. In paragraph 1, The above pouch-type secondary battery residual gas discharge device is A residual gas discharge device for a pouch-type secondary battery, characterized in that it further includes an ultrasonic applying member that applies ultrasonic waves to the pouch so as to separate the residual gas adsorbed on components inside the pouch and promote discharge of the residual gas inside the pouch.

7. In paragraph 1, The above gas discharge member A residual gas discharge device for a pouch-type secondary battery, characterized in that it further includes a gas discharge unit that discharges the residual gas remaining inside the gas discharge cylinder in a state separated from the pouch to the outside of the gas discharge cylinder.

8. In paragraph 1, A residual gas discharge device for a pouch-type secondary battery, characterized in that the size of the gas discharge cylinder is formed in the range of 150 to 2500 ml.

9. To remove residual gas remaining inside the pouch of the pouch-type secondary battery during the manufacturing process of the pouch-type secondary battery. A gas discharge tube inserted into the front side of the above pouch, A gas discharge cylinder connected to the above gas discharge pipe, A gas discharge member including a negative pressure forming pump that forms negative pressure inside the gas discharge cylinder; A residual gas discharge device for a pouch-type secondary battery, characterized in that when the negative pressure forming pump is operated while the front side of the gas discharge pipe is inserted into the pouch and negative pressure is formed in the gas discharge cylinder, the residual gas inside the pouch is discharged through the gas discharge pipe.

10. In paragraph 4, The above gas discharge member A pouch adsorption unit that adsorbs the inner surface of the outer tube-outer sealing member constituting the surface-adhesive member of the pouch to the outer surface of the outer tube-outer sealing member when the residual gas is discharged through the gas discharge pipe inserted into the pouch; When the discharge of the residual gas is completed and the gas discharge pipe is separated from the pouch, a gas leakage prevention unit is further included to prevent the residual gas moved to the gas discharge cylinder from randomly leaking out through the gas discharge pipe. The above pouch adsorption part A discharge pipe penetration hole formed by cutting and penetrating a portion of the above gas discharge pipe, A triangular pyramid-shaped sealing body recessed hole formed in the inner surface of the outer sealing body of the pipe so as to communicate with the above discharge pipe penetration hole, and recessed in the shape of a triangular pyramid; A sunken extension hole penetrating the outer surface of the pipe outer seal from the top of the triangular pyramid-shaped seal hole, An adsorption expansion hole formed in a sunken shape on the outer surface of the outer tube sealing member in a curved shape that is wider by a certain area than the sunken extension hole and is connected to the sunken extension hole, A sunken discharge pipe connecting pipe extending from the side of the triangular pyramid-shaped sealing body sunken hole at a position spaced apart from the sunken extension hole and connecting the inner surface of the gas discharge pipe and the triangular pyramid-shaped sealing body sunken hole, An elastic deformation blocking panel formed in a shape that blocks across the discharge pipe penetration hole and made of an elastically deformable material, and capable of being elastically deformed to bend toward the inside of the gas discharge pipe due to negative pressure applied to the inside of the gas discharge pipe, A triangular pyramid-shaped protrusion is formed in a triangular pyramid shape so as to be inserted into the triangular pyramid-shaped sealing body recessed hole, protruding from the elastic deformation blocking panel, and blocking the triangular pyramid-shaped sealing body recessed hole so that the recessed extension hole and the recessed discharge pipe communication pipe are not connected to each other, and when the elastic deformation blocking panel is elastically deformed to bend toward the inside of the gas discharge pipe due to negative pressure applied to the inside of the gas discharge pipe, the triangular pyramid-shaped protrusion is separated from the triangular pyramid-shaped sealing body recessed hole so that the recessed extension hole and the recessed discharge pipe communication pipe are connected to each other. The above gas leak prevention unit An inner wall connector fixed to the inner wall of the above gas discharge pipe, A central extension extending from the inner wall connecting member toward the inner center of the gas discharge pipe, A one-sided inclined body extending from the central extension body in an inclined direction toward one side of the inner surface of the gas discharge pipe so as to block the inner half of the gas discharge pipe, A residual gas discharge device for a pouch-type secondary battery, characterized in that it includes a side-facing inclined body that extends from the central extension body in an inclined direction toward the other side of the inner surface of the gas discharge pipe and can block the remaining inner half of the gas discharge pipe other than the portion blocked by the side-facing inclined body.

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