Degassing system for pouch for secondary battery

Abstract

The present invention relates to a degassing system for a pouch of a secondary battery, which aims to be processed after suction of gas regardless of the size of a battery cell pouch, to set a time or a gas discharge amount of degassing according to the size of the pouch to improve the convenience of operation, to compare the gas discharge amount with a reference value defined according to the size of the pouch, to automatically detect whether an abnormality occurs in a suction line for degassing according to a comparison value, and to reduce the cost of a product while securing quality through a simplified structure. The degassing system for a pouch of a secondary battery according to the present invention includes a separation part including a gas suction path for suction of a pouch and pulling the pouch to form a space inside the pouch, a gas discharge part installed at the separation part and puncturing the pouch with a needle having a gas discharge path formed inside and discharging gas inside the pouch through the gas discharge path, and a foreign matter removal part removing discharge matter mixed with gas respectively flowing into the separation part and the inside of the gas discharge path respectively.

Description

Technical Field

[0001] This invention relates to a degassing system for a secondary battery bag, and more specifically, to a degassing system for a secondary battery bag that can completely remove gas and other foreign matter present inside the bag through a simplified structure during the manufacturing process of the secondary battery bag. Background Technology

[0002] Generally speaking, unlike primary batteries which cannot be recharged, secondary batteries are batteries that can be recharged and discharged, and are widely used in electronic devices such as mobile phones, laptops, camcorders, or electric vehicles.

[0003] In particular, lithium-ion batteries have a larger capacity than nickel-cadmium or nickel-metal hydride batteries, which are commonly used as power sources for electronic devices, and lithium-ion batteries have a high energy density per unit weight. As a result, the use of lithium-ion batteries is increasing rapidly.

[0004] Lithium-ion batteries primarily use lithium-based oxides and carbon materials as the anode and cathode active materials, respectively.

[0005] A lithium secondary battery includes: an electrode assembly consisting of an anode plate coated with an anode active material and a cathode plate coated with a cathode active material, respectively, sandwiched by a separator; and an external material, namely a battery casing, which houses and seals the electrode assembly and the electrolyte.

[0006] Based on the shape of the external material, these lithium secondary batteries can be divided into can-type secondary batteries with electrode components built into a metal can and bag-type secondary batteries with electrode components built into a bag of aluminum laminates.

[0007] In the manufacturing process of pouch-type secondary batteries, an electrode assembly including a cathode, separator, and anode is placed inside the outer material of the pouch, and electrolyte is injected, followed by sealing the edges. The battery is then activated through several charge / discharge cycles.

[0008] During this process, gas is generated inside the battery cell. To collect the generated gas, the size of the outer material of the pouch-type secondary battery before the activation process is made larger than the size of the final product.

[0009] In the outer material of the bag, the portion that is larger than the portion where the electrode assembly is located is called the air bladder portion, and the gas generated during the activation process can be captured in the air bladder portion.

[0010] After the activation process is completed, the gas is removed by perforating the air bladder, then the air bladder is cut and the outer material of the bag is resealed according to the final product specifications.

[0011] On the other hand, when gas exceeding the allowable expansion range of the airbag portion is generated during the activation process, the insulation of the sealing portion may be damaged.

[0012] However, since the amount of gas generated during the activation process can vary depending on the material of the electrode assembly and the activation conditions, it is difficult to determine the appropriate size of the gas bladder.

[0013] Therefore, in the prior art, the size of the airbag is made as large as possible to prevent damage to the insulation of the seal during the activation process.

[0014] However, since the airbag section is an unnecessary part that must be removed after the degassing process, it is very inefficient to make the airbag section too large from a production cost perspective.

[0015] Existing technical documents

[0016] Patent documents

[0017] (Patent Document 1) Patent Publication No. 10-2010-0118394 Summary of the Invention

[0018] (a) Technical problems to be solved

[0019] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a degassing system for a secondary battery bag, which can process the gas after it is inhaled, regardless of the size of the battery cell bag.

[0020] Another objective of the present invention is to provide a degassing system for a secondary battery bag, which can set the degassing time or gas discharge rate according to the size of the bag to improve the convenience of operation, and can compare the gas discharge rate with a reference value defined according to the size of the bag, and automatically detect whether there is an abnormality in the degassing suction line based on the comparison value.

[0021] Another objective of the present invention is to provide a degassing system for a bag for secondary batteries, which can reduce product costs while ensuring quality through a simplified structure.

[0022] (II) Technical Solution

[0023] This invention provides a degassing system for a secondary battery bag, which is a system for removing gas from a secondary battery bag with a sealed edge. The degassing system includes: a separation section, which includes an suction path for adsorbing the bag and pulling the bag to form a space inside the bag; a gas discharge section, which is installed in the separation section and punctures the bag with a needle having a gas discharge path formed inside, and discharges the gas inside the bag through the gas discharge path; and a foreign matter removal section, which removes the discharge mixture containing the gas that flows into the separation section and the gas discharge path respectively.

[0024] Additionally, the foreign matter removal unit includes: a first suction line connected to the suction path; a first collection box connected to the first suction line; a first suction pump connected to the first collection box, which provides the required adsorption force to the separation unit's adsorption bag while suctioning the gas-mixed exhaust material through a suction operation; a second suction line connected to the gas exhaust path; a second collection box connected to the second suction line; and a second suction pump connected to the second collection box, which suctions the gas-mixed exhaust material through a suction operation.

[0025] Furthermore, the degassing system further includes a vacuum filter, which is connected to the first intake line and the second intake line respectively, and filters the exhaust mixture containing gas.

[0026] In addition, the degassing system further includes: a first vacuum pressure sensor for sensing the pressure in the first suction line; a solenoid valve connected to the first suction line and opening or closing the first suction line based on whether the first vacuum pressure sensor senses the pressure in the first suction line; a second vacuum pressure sensor for sensing the pressure in the second suction line; and a precision control valve connected to the second suction line and opening or closing the second suction line based on whether the second vacuum pressure sensor senses the pressure in the second suction line.

[0027] Furthermore, the degassing system further includes: a first Kez valve connected to a first solenoid valve via the first suction line; and a second Kez valve connected to the solenoid valve via the second suction line.

[0028] In addition, the degassing system further includes: a first pressure regulating valve, which adjusts the opening range of the first suction line according to the size of the bag so that the suction pressure of the first suction pump acting on the first suction line is different; and a second pressure regulating valve, which adjusts the opening range of the second suction line according to the size of the bag so that the suction pressure of the second suction pump acting on the second suction line is different.

[0029] Furthermore, the degassing system further includes: a first residual pressure removal unit, which removes residual pressure present in the first intake line after removing the gas-mixed effluent from the separation unit. The first residual pressure removal unit includes: a first connecting line connected to the first intake line; and a first air conditioner that supplies air to the first connecting line to allow air to flow into the first intake line.

[0030] In addition, the degassing system further includes: a second residual pressure removal unit, which removes residual pressure present in the second intake line after removing the gas-mixed effluent from inside the gas discharge path; the second residual pressure removal unit includes: a second connecting line connected to the second intake line; and a second air conditioner that supplies air to the second connecting line so that air flows into the second intake line.

[0031] In addition, the degassing system further includes: a control unit that sets the degassing time or gas discharge rate through the second inhalation line according to the size of the bag; and a sensor unit that, after measuring the amount of gas discharged from the second inhalation line according to the control signal of the control unit, transmits it to the control unit, the control unit comparing the gas discharge rate measured by the sensor unit with a reference value defined according to the size of the bag, and detecting whether an abnormality has occurred in the second inhalation line based on the comparison value.

[0032] (III) Beneficial Effects

[0033] The degassing system for the secondary battery bag according to the present invention can process the gas after it is drawn in, regardless of the size of the bag, and can automatically break the vacuum in the degassing intake line after the degassing operation is completed.

[0034] In addition, the degassing heating time or gas discharge rate can be set according to the bag size to improve the convenience of operation. The gas discharge rate can be compared with the reference value defined according to the bag size, and the degassing suction line can be automatically detected for abnormalities based on the comparison value. Attached Figure Description

[0035] Figure 1 and Figure 2 This is a perspective view showing the degassing system of a secondary battery bag according to the present invention.

[0036] Figure 3 This is a perspective view showing the separation section and the gas discharge section of the degassing system applied to the secondary battery bag according to the present invention.

[0037] Figure 4 This is a front view showing the usage state of the separation section and the gas discharge section of the degassing system applied to the secondary battery bag according to the present invention.

[0038] Figure 5 This is an enlarged cross-sectional view of the separation section and the gas discharge section of the degassing system applied to the secondary battery bag according to the present invention.

[0039] Figure 6 This is a cross-sectional view showing the variable portion of the degassing system applied to the secondary battery bag according to the present invention.

[0040] Figures 7 to 12 This is a diagram illustrating the steps of removing gas from inside a battery cell bag using a degassing system for a secondary battery bag according to the present invention.

[0041] Figure 13 This is a plan view showing the configuration of the degassing system for a secondary battery bag according to the present invention.

[0042] Figure 14 This diagram shows the connection state of the separation section, gas discharge section, and foreign matter removal section of the degassing system applied to the secondary battery bag according to the present invention.

[0043] Figure 15 This is a block diagram illustrating the connection relationships of components applied to a secondary battery bag according to the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 1: Degassing system for secondary battery bags; 10: Separation section

[0046] 11: Adsorption plate 111: Main body

[0047] 111a: Insertion hole; 111b: Suction path

[0048] 111c: Center hole; 111d: Suction nozzle

[0049] 12: Degassing adsorption plate 12a: Guide hole

[0050] 13: Forward / backward movement drive unit 131: Upper plate

[0051] 131a: Moving guide hole; 132: Motor

[0052] 133: Housing 134: Guide rail

[0053] 135: Sliding part; 136: Connecting block

[0054] 137: Connecting shaft; 14: Lower adsorption plate

[0055] 141: Lower main body 20: Gas exhaust section

[0056] 21: Needle 22: Exhaust pipe

[0057] 23: Variable part 231: Movement guidance part

[0058] 2311: First support plate; 232: Bracket

[0059] 233: Moving part; 2331: Second support plate

[0060] 234: Variable guidance unit; 235: Variable control unit

[0061] 2351: Propulsion Unit; 236: Spring

[0062] 24: Needle drive unit 241: Piston

[0063] 30: Foreign object removal unit; 31: First suction line

[0064] 311, 1511: First branch pipeline; 32: First collection box

[0065] 33: First suction pump; 34: Second suction line

[0066] 341, 1611: Second branch pipeline; 35: Second collection box

[0067] 36: Second suction pump; 40: Vacuum filter

[0068] 50: First vacuum pressure sensor; 60, S1, S2: Solenoid valves

[0069] 70: Second vacuum pressure sensor; 80: Precision control valve

[0070] 90: Bag; 91: Battery cell body

[0071] 92: Battery cell capsule; 92a: First surface

[0072] 92b: Second surface; 100: Sealing device

[0073] 110: First Kez valve; 120: Second Kez valve

[0074] 130: First pressure regulating valve; 140: Second pressure regulating valve

[0075] 150: First residual pressure removal unit; 151: First connecting pipeline

[0076] 152: First air conditioner; 160: Second residual pressure removal unit

[0077] 161: Second connecting line; 162: Second air conditioner

[0078] 170: Control Unit 180: Sensor Unit

[0079] 200: Main air conditioner; 210: Air supply solenoid valve manifold

[0080] 2110: First supply pipeline; 212: Second supply pipeline

[0081] 213: Third supply pipeline; 214: Fourth supply pipeline Detailed Implementation

[0082] The advantages, features, and methods of implementing the present invention will become clearer with reference to the embodiments and accompanying drawings described in the following detailed description.

[0083] However, the present invention is not limited to the embodiments disclosed below and can be implemented in various different ways. These embodiments are provided only to complete the disclosure of the invention and to fully inform those skilled in the art of the subject matter. The scope of the invention is defined by the scope of the claims. Throughout this specification, the same reference numerals refer to the same elements.

[0084] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the invention. However, the present invention can be implemented in various different ways and is not limited to the embodiments described in this specification. Throughout the specification, similar parts are referred to by the same reference numerals.

[0085] Figure 1 and Figure 2 This is a perspective view showing the degassing system of a secondary battery bag according to the present invention. Figure 3 This is a perspective view showing the separation section and the gas discharge section of the degassing system applied to the secondary battery bag according to the present invention. Figure 4 This is a front view showing the separation section and gas discharge section of the degassing system applied to the secondary battery bag according to the present invention in use. Figure 5 This is an enlarged cross-sectional view of the separation section and the gas discharge section of the degassing system applied to the secondary battery bag according to the present invention. Figure 6 This is a cross-sectional view showing the variable portion of the degassing system applied to the secondary battery bag according to the present invention. Figures 7 to 12 This diagram illustrates the steps of removing gas from inside a battery cell pouch using a degassing system for a secondary battery pouch according to the present invention. Figure 13 This is a plan view showing the configuration of the degassing system for a secondary battery bag according to the present invention. Figure 14 This diagram illustrates the connection state of the separation section, gas discharge section, and foreign matter removal section of the degassing system applied to the secondary battery bag according to the present invention. Figure 15 This is a block diagram illustrating the connection relationships of components applied to a secondary battery bag according to the present invention.

[0086] The degassing system 1 for a secondary battery bag according to the present invention is a product that can draw in and remove gases and other foreign matter present inside the bag 90 during the manufacturing process of the secondary battery bag (hereinafter referred to as "bag").

[0087] In addition, the degassing system can be used semi-permanently by venting gases and foreign matter that have flowed into the product.

[0088] At this time, the bag 90 may mainly include the battery cell body 91 and the battery cell pouch 92.

[0089] The battery cell body 91 and the battery cell pouch 92 can be integrally formed by sealing the edges of the first surface 92a and the second surface 92b, which are formed of the same material and size.

[0090] In addition, the battery cell body 91 houses the electrode assembly and electrolyte inside, and the battery cell pouch 92 is used to remove gas present inside the battery cell body 91.

[0091] In order to remove the gas present in the internal space of the battery cell bag 92, the degassing system of the secondary battery bag according to the present invention may include: a separation section 10 for separating the first surface 92a and the second surface 92b of the battery cell bag 92; a gas discharge section 20 for removing the gas present in the internal space of the battery cell bag 92; and a foreign matter removal section 30 for removing the gas-mixed discharge material (dust, electrolyte) that flows into the separation section 10 and the gas discharge path through the gas discharge section 20.

[0092] At this time, one or more separation sections 10 with gas discharge sections 20 can be applied, depending on the size of the bag 90. The accompanying drawings show an example of removing gas from the inside of the battery cell bag 92 with three separation sections 10 with gas discharge sections 20 applied to the first surface 92a and the second surface 92b of the bag 90, respectively.

[0093] Furthermore, the separation section 10 on which the gas discharge section 20 is installed can be respectively positioned on the first surface 92a and the second surface 92b, and located on horizontal lines relative to each other. Additionally, the separation section 10 on the first surface 92a and the second surface 92b, on which the gas discharge section 20 is installed, can be positioned opposite each other, sandwiching the battery cell pouch.

[0094] At this time, the number of separation sections 10 equipped with gas discharge section 20 is not limited to three, and the number of separation sections 10 can be selectively reduced or increased according to the size of bag 90.

[0095] The separation section 10 is used to separate the first surface 92a and the second surface 92b so that the gas discharge section 20, which will be described later, can draw in the gas present inside the battery cell pouch 92. The separation section 10 may include at least one of the following: a main body 111, an adsorption plate 11, a degassing adsorption plate 12, a lower adsorption plate 14, and a forward / backward movement drive section 13.

[0096] At this point, the number of separation sections 10 can be increased or decreased depending on the size of the bag 90.

[0097] The main body 111 can be formed into a polygonal block with a predetermined thickness and area.

[0098] An insertion hole 111a is formed inside the main body 111, into which a needle 21 and an exhaust pipe 22, which are part of the gas exhaust section 20 described later, are inserted together.

[0099] Additionally, a central hole 111c and an air intake path 111b are formed inside the main body 111. The central hole 111c is disposed between the insertion holes 111a, and the air intake path 111b is connected to the foreign matter removal unit 30, which will be described later, and is also connected to the central hole 111c.

[0100] At this time, the insertion hole 111a is formed along the horizontal length direction of the body 111, and the air intake path 111b is formed along the vertical direction on the upper surface of the body 111 and is connected to the insertion hole 111a.

[0101] In addition, multiple insertion holes 111a can be formed, and the same number of needles 21 and exhaust pipes 22 as insertion holes 111a can be applied to each.

[0102] Additionally, the end of the central hole 111c is exposed at the front of the separation section 10 and faces the first surface 92a or the second surface 92b of the bag 90.

[0103] The central hole 111c causes the suction force of the gas discharge section 20, which will be described later, to act on the first side 92a or the second side 92b of the bag 90, so that the adsorption plate 11 can adsorb the first surface 92a or the second surface 92b of the bag 90.

[0104] Additionally, an air intake nozzle 111d may be installed in the air intake path 111b, and a first branch line 311, which will be described later, may be installed in the air intake nozzle 111d.

[0105] At this time, when it is necessary to increase the gas removal speed, the number of insertion holes 111a, needles 21 and exhaust pipes 22 can be changed according to various conditions such as the size of bag 90.

[0106] An adsorption plate 11 is formed at the front of the main body 111, which causes the first surface 92a to separate from the second surface 92b through interaction with the forward / backward moving drive unit 13, which will be described later.

[0107] The adsorption plate 11 can be formed as an elliptical ring to be adsorbed in many areas of the first surface 92a, and can be formed along the front edge of the body 111.

[0108] When the degassing adsorption plate 12 is fixed to the adsorption plate 11, it is adsorbed together with the adsorption plate 11 on the first surface 92a and the second surface 92b respectively.

[0109] Similar to needle 21, two degassing adsorption plates 12 are used.

[0110] Inside the degassing adsorption plate 12, there is a guide hole 12a for introducing or withdrawing needles 21.

[0111] At this time, at the front end of the adsorption plate 11, the connecting hole for allowing the needle 21 to move toward the degassing adsorption plate 12 is formed to be on the same line as the guide hole 12a and the insertion hole 111a.

[0112] The degassing adsorption plate 12 is formed in a generally annular shape to have excellent adsorption force on the first surface 92a, and the diameter of the degassing adsorption plate 12 can be formed to gradually decrease from the end facing the first surface 92a to the other end connected to the adsorption plate 11.

[0113] The space between the interior of the adsorption plate 11, the exterior of the degassing adsorption plate 12, and the bag 90 is formed as a watertight structure to create a vacuum state, so that the gas discharge section 20, which will be described later, can completely remove the gas in the battery cell bag 92.

[0114] The lower adsorption plate 14 is used to more widen and stably separate the first surface 92a and the second surface 92b of the battery cell bag 92.

[0115] The lower adsorption plate 14 consists of two plates, i.e., a pair, with the battery unit bag 92 sandwiched between the two plates 14 and arranged opposite each other.

[0116] The lower adsorption plate 14 can be formed in the same shape as the adsorption plate 11.

[0117] That is, one lower adsorption plate 14 faces the first surface 92a, and the other lower adsorption plate 14 faces the second surface 92b.

[0118] In addition, the lower adsorption plate 14 can be positioned lower than the main body 111.

[0119] The lower adsorption plate 14 includes a lower body 141, which moves forward or backward relative to the first surface 92a and the second surface 92b respectively by a separate driving source.

[0120] At this point, although not shown in the accompanying drawings, the drive source may be formed by a cylinder, a cam, or by the same product as the forward / backward movement drive unit 13, which will be described later.

[0121] The drive source operates simultaneously with the forward / backward movement drive unit 13, which will be described later.

[0122] That is, when the forward / backward moving drive unit 13 moves the adsorption plate 11 and the degassing adsorption plate 12 forward, the drive source moves the lower adsorption plate 14 forward and adsorbs it onto the first surface 92a. When the forward / backward moving drive unit 13 moves the adsorption plate 11 and the degassing adsorption plate 12 backward, the drive source moves the lower adsorption plate 14 backward and separates the first surface 92a and the second surface 92b.

[0123] Next, a lower adsorption plate 14 is formed at one end of the lower main body 141 and is located on a line substantially perpendicular to the adsorption plate 11 and the degassing adsorption plate 12.

[0124] Therefore, when the lower adsorption plate 14 moves forward, it is adsorbed together with the adsorption plate 11 onto the first surface 92a. When the lower adsorption plate 14 moves backward, it pulls the first surface 92a together with the adsorption plate 11 and separates from the second surface 92b.

[0125] At this time, compared to the adsorption plate 11, the lower adsorption plate 14 separates from the lower side of the first surface 92a, thereby forming a barrier on the battery cell pouch 92. Therefore, during the process of drawing in and expelling the gas present in the internal space of the battery cell pouch 92 through the needle 21, the electrolyte in the battery cell body 91 is prevented from rising into the internal space of the battery cell pouch 92 and being drawn in by the needle 21.

[0126] In this case, the lower adsorption plate 14 pulls the first surface 92a and the second surface 92b respectively while the battery cell pouch 92 is sandwiched between them and arranged opposite each other, so as to form a wider space in the battery cell pouch 92.

[0127] On the other hand, the aforementioned main body 111 can be set in a form that is approximately The front of connector C with a cross-sectional shape.

[0128] The connector C serves as a medium for connecting the main body 111 and the forward / backward movement drive unit 13.

[0129] A connection hole (not shown) is formed in the connector C at a position corresponding to the insertion hole 111a of the main body 111.

[0130] The forward / backward movement drive unit 13 is used to move the adsorption plate 11 and the degassing adsorption plate 12 forward and backward, and the forward / backward movement drive unit 13 may include: an upper plate 131, which is disposed at a predetermined interval from the upper side of the connector C, and rectangular movement guide holes 131a are formed on both sides; a motor 132, which is disposed on the upper surface of the upper plate 131; a housing 133, which is disposed on the upper surface of the upper plate 131; a guide rail 134, which is disposed on the upper side of the housing 133; and a rotating shaft (not shown), which is housed inside the housing 133 and rotates in the forward or reverse direction by the power of the motor 132. The housing 133 has a right-hand thread and a left-hand thread formed on its right and left sides respectively, with the central part as a reference; a sliding part 135 that moves in two directions along the guide rail 134 on the upper surface of the housing 133; a mounting ring (not shown) formed on the lower side of the sliding part 135 and mounted on the outer periphery of the rotating shaft inside the housing 133, with a thread formed on its inner periphery that allows it to move in two directions along the right-hand thread of the rotating shaft; a connecting block 136 fixed to the upper surface of the connector C; and a connecting shaft 137 that connects the two sides of the sliding part 135 and the connecting block 136 and moves forward or backward in the moving guide hole 131a.

[0131] In this invention, when the motor 132 causes the rotating shaft to rotate in the forward direction, the mounting ring moves forward along the right thread and gradually moves toward the central part of the rotating shaft. When the motor 132 causes the rotating shaft to rotate in the reverse direction, the mounting ring can move backward along the right thread and gradually move toward the right side of the rotating shaft.

[0132] Furthermore, when the mounting ring moves forward, the sliding part 135, connecting block 136, connecting shaft 137, connector C, and separating part 10 all move forward, causing the adsorption plate 11 and degassing adsorption plate 12 to adhere to the first surface 92a. In this state, when the mounting ring moves backward, the sliding part 135, connecting block 136, connecting shaft 137, connector C, and separating part 10 all move backward, ultimately causing the adsorption plate 11 and degassing adsorption plate 12 to pull the first surface 92a and separate from the second surface 92b.

[0133] On the other hand, as described above, the gas discharge section 20 is used to remove gas present in the internal space of the battery cell pouch 92 separated by the separation section 10 from the first surface 92a and the second surface 92b, and the gas discharge section 20 may include at least one of the needle 21, the exhaust pipe 22, the variable section 23 and the needle drive section 24.

[0134] The needles 21 consist of two needles, i.e., a pair, and are inserted into the insertion holes 111a of the main body 111 respectively.

[0135] The needles 21 are arranged parallel to each other and can move forward or backward along the insertion hole 111a and the guide hole 12a, respectively.

[0136] Inside the needle 21, a gas discharge path is formed along the length direction for discharging gas from the battery cell pouch 92.

[0137] A portion of the exhaust pipe 22 passes through the connection hole of the connector C and is inserted into the insertion hole 111a of the body 111, while the other portion protrudes outward from the connector C.

[0138] In addition, an installation tube 211 is installed on the outer periphery of the end of the exhaust pipe 22, which is provided at the end of the needle 21.

[0139] The internal space of the exhaust pipe 22 and the gas discharge path of the needle 21 are connected to each other.

[0140] A variable part 23 is applied to the portion of the exhaust pipe 22 that protrudes to the outside of the main body 111. The variable part 23 is used to change the lead-out length of the needle 21 that leads to the outside of the degassing adsorption plate 12.

[0141] like Figure 6 As shown, the variable part 23 may include at least one of the following: a movement guide 231, a bracket 232, a movement part 233, a variable guide 234, a variable control part 235, and a spring 236.

[0142] The moving guide 231 is coupled to the piston 241 of the needle drive 24. Therefore, the moving guide 231 can move forward or backward relative to the first surface 92a.

[0143] The moving guide 231 can be formed as a polygonal box with an open bottom and an empty space inside, and a first support plate 2311 supporting the spring 236 is formed in the internal space.

[0144] The stent 232 is roughly formed as follows The cross-sectional shape has through holes (not shown) formed on the front and rear sides for mounting the exhaust pipe 22.

[0145] The movable part 233 is connected to the movable guide part 231 and fixed to the bracket 232.

[0146] The movable part 233 can be formed as a polygonal box with an open upper surface and an empty space inside, and a second support plate 2331 for supporting the spring 236 is formed in the internal space at a position separated from the first support plate 2311.

[0147] The movable part 233 can be movably connected to the movable guide part 231.

[0148] As an example, a generally formed shape is formed on either side of the bottom surface of the moving guide 231 and either side of the upper surface of the moving part 233. A track groove (not shown) with a cross-sectional shape can be formed on the other side, generally shaped as follows. A sliding portion 135 (not shown) with a cross-sectional shape is provided so that the moving portion 233 can slide forward or backward in the moving guide portion 231.

[0149] The variable guide portion 234 is attached to the outer surface of the movable guide portion 231, and can be generally formed as follows: Cross-sectional shape.

[0150] A variable guide hole is formed on the surface of the variable guide section 234 that faces the moving section 233.

[0151] The variable control unit 235 moves the moving part 233 forward. The variable control unit 235 includes a pushing part 2351, which passes through a variable guide hole and contacts the moving part 233.

[0152] At this time, interlocking threads are formed on the inner periphery of the variable guide hole and the outer periphery of the pusher 2351.

[0153] Therefore, when the variable control unit 235 is rotated in the forward direction, the push unit 2351 pushes the moving unit 233 forward while moving forward along the variable guide hole, and finally moves the exhaust pipe 22 connected via the bracket 232 and the needle 21 installed in the exhaust pipe 22 forward.

[0154] Furthermore, when the variable control unit 235 is rotated in the opposite direction, the pushing unit 2351 moves backward along the variable guide hole and separates from the moving unit 233.

[0155] On the outer peripheral surface of the variable control unit 235, a scale for indicating the length of the needle 21 flowing in or out, and a number corresponding to the scale, can be printed.

[0156] When the pushing part 2351 separates from the moving part 233, the spring 236 performs the function of restoring the moving part 233 to its original position. The spring 236 is simultaneously housed in the internal space of the moving guide part 231 and the moving part 233, and the two sides of the spring 236 are respectively fixed to the first support plate 2311 and the second support plate 2331.

[0157] Therefore, when the moving part 233 is moved forward by rotating the variable control unit 235 in the forward direction, the first support plate 2311 and the second support plate 2331 move away from each other, and the spring 236 expands. When the variable control unit 235 is rotated in the reverse direction, the spring 236 contracts back to its original shape, and the moving part 233 moves backward.

[0158] The further forward the moving part 233 moves, the longer the lead-out length of the needle 21 relative to the degassing adsorption plate 12 becomes, and the further backward the moving part 233 moves, the shorter the lead-out length of the needle 21 relative to the degassing adsorption plate 12 becomes. Therefore, the lead-out length of the needle 21 can be adjusted by controlling the variable control part 235 according to the thickness of the first surface 92a.

[0159] The needle drive unit 24 moves the needle 21 by driving it so that the needle 21 moves into or out of the battery cell pouch 92, and can be formed by a rodless cylinder or a hydraulic cylinder. An example of the needle drive unit 24 being formed by a rodless cylinder is shown in the figure.

[0160] The upper surface of the needle drive unit 24 is fixed to the top surface of the connector C, and the piston 241 is coupled to the upper surface of the fixing block.

[0161] The piston 241 moves back and forth in two directions along the length of the needle drive section 24, while simultaneously causing the exhaust pipe 22 and the needle 21 to move forward or backward relative to the first surface 92a.

[0162] At this time, as the needle 21 moves forward, the front side of the needle 21 is drawn out from the degassing adsorption plate 12, then penetrates the first surface 92a and is located in the internal space of the battery cell bag 92.

[0163] On the other hand, the foreign matter removal unit 30 provides the suction force required for degassing and the suction force required for vacuuming the bag 90 to the suction path 111b and the gas discharge path, respectively.

[0164] At this time, when the foreign matter removal unit 30 generates suction force, it not only draws in the gas inside the bag 90, but also draws in a predetermined amount of discharge, namely electrolyte.

[0165] Therefore, the foreign matter removal unit 30 is configured to also remove electrolyte that is accidentally inhaled along with the gas.

[0166] Therefore, the foreign matter removal unit 30 may include a first suction line 31, a first collection box 32, a first suction pump 33 for removing gas and electrolyte drawn into the separation unit 10, and a second suction line 34, a second collection box 35, and a second suction pump 36 for removing gas and electrolyte drawn into the gas discharge path.

[0167] The first inhalation line 31 is composed of a tubular structure, and its interior forms a channel for conveying the exhaust mixture containing gas.

[0168] A total of three first suction lines 31 are used, and each first suction line 31 includes two first branch lines 311. The first branch lines 311 are respectively connected to suction nozzles 111d. The suction nozzles 111d are arranged in the suction paths 111b of the two separation parts 10 facing the first surface 92a and the second surface 92b respectively, so as to be able to suck in gas or electrolyte leaking between the degassing adsorption plate 12 and the first surface 92a or between the degassing adsorption plate 12 and the second surface 92b.

[0169] The first collection box 32 is connected to the first suction line 31 to store gas or electrolyte.

[0170] The first suction pump 33 is connected to the first collection tank 32 and draws in the gas or electrolyte stored in the first collection tank 32 through a suction operation and discharges it to the outside or supplies it to a separate processing tank (not shown).

[0171] The interior of the processing chamber can be equipped with filters for filtering gases or electrolytes.

[0172] In addition, the suction force of the first suction pump 33 works together with the first suction line 31, the suction port and the center hole 111c.

[0173] That is, the adsorption plate 11 is adsorbed onto the first surface 92a or the second surface 92b by the suction force of the first suction pump 33, and due to the suction force of the first suction pump 33, the gas or electrolyte leaking between the degassing adsorption plate 12 and the first surface 92a or between the degassing adsorption plate 12 and the second surface 92b is sequentially drawn into the first suction pump 33 through the central hole 111c, the suction hole, the first suction line 31 and the first collection box 32.

[0174] The second inhalation line 34 is composed of a tubular structure and has an internal channel for conveying the exhaust mixture containing gas.

[0175] A total of three second intake lines 34 are used, and each second intake line 34 includes two second branch lines 341, which are connected to exhaust pipes 22 respectively disposed on the first surface 92a and the second surface 92b, thereby enabling the intake of gas or electrolyte in the gas exhaust path.

[0176] The second collection box 35 is connected to the second suction line 34 to store gas or electrolyte.

[0177] The second suction pump 36 is connected to the second collection tank 35 and draws in the gas or electrolyte stored in the second collection tank 35 through suction operation and discharges it to the outside or supplies it to a separate treatment tank (not shown).

[0178] The interior of the processing chamber can be equipped with filters for filtering gases or electrolytes.

[0179] In addition, the suction force of the second suction pump 36 works together with the second suction line 34, the exhaust pipe 22 and the gas discharge path.

[0180] That is, the degassing adsorption plate 12 is adsorbed onto the first surface 92a or the second surface 92b by the suction force of the second suction pump 36, and due to the suction force of the second suction pump 36, the gas or electrolyte flowing into the gas discharge path is sequentially drawn into the second suction pump 36 through the exhaust pipe 22, the second suction line 34 and the second collection box 35.

[0181] Furthermore, the degassing system for the secondary battery bag according to the present invention may further include a first vacuum pressure sensor 50, a solenoid valve 60, a first Kitz valve 110, a first pressure regulating valve 130, a second vacuum pressure sensor 70, a second Kitz valve 120, a second pressure regulating valve 140, a control unit 170, and a sensor unit 180.

[0182] Three first vacuum pressure sensors 50 are used in total to sense the channel pressure of the first suction line 31 respectively.

[0183] Three solenoid valves 60 are used in total, and they are installed in the first suction line 31 respectively.

[0184] Therefore, the solenoid valve 60 can open or close the passage of the first suction line 31 respectively.

[0185] At this point, a vacuum filter 40 can be further installed in the first suction line 31.

[0186] The vacuum filter 40 filters the electrolyte delivered through the channel of the first suction line 31 to prevent electrolyte or dust from flowing into the solenoid valve 60, thereby preventing a shortened lifespan of the solenoid valve 60.

[0187] During the degassing process of bag 90, the first vacuum pressure sensor 50 senses the pressure of each channel of the first suction line 31 in real time and transmits it to the control unit 170, which will be described later.

[0188] The control unit 170 stores the reference pressure value of the passage of the first suction line 31.

[0189] Therefore, when electrolyte flows into one or more first intake lines 31, causing a decrease in channel pressure and resulting in a difference between the channel pressure value of the first intake line 31 and the reference pressure value of the channel, the control unit 170 operates the solenoid valve 60 installed in the first intake line 31 to close the channel.

[0190] In addition, the control unit 170 can display the first suction line 31 into which the electrolyte flows on the operator monitor, and notify the operator by making a buzzer installed in the degassing system sound.

[0191] One first open valve 110 may be applied and connected together to three first suction lines 31.

[0192] Additionally, the first Kez valve 110 can be connected to the solenoid valve 60 via the first suction line 31.

[0193] Therefore, when degassing bag 90, the first Kez valve 110 and solenoid valve 60 can be opened, and when the degassing operation of bag 90 is completed, the first Kez valve 110 and solenoid valve 60 can be closed.

[0194] The first pressure regulating valve 130 can be installed in the first suction line 31 and can be located between the first open valve 110 and the first collection box 32.

[0195] The first pressure regulating valve 130 regulates the main pressure required for the vacuum of bag 90.

[0196] Therefore, the first pressure regulating valve 130 can be configured as a ball valve, and its operation is controlled by the control unit 170.

[0197] Specifically, the first pressure regulating valve 130 can adjust the opening range of the first suction line 31 according to the size of the bag 90.

[0198] That is, the suction force of the first suction pump 33 acting on the passage of the first suction line 31 varies according to the opening range of the first pressure regulating valve 130. For example, when the lateral length of the bag 90 is 300 mm and the longitudinal length is 260 mm, the control unit 170 can control the first pressure regulating valve 130 so that the suction pressure of the first suction pump 33 acting on the passage of the first suction line 31 is approximately 80 kPa.

[0199] In this case, the first vacuum pressure sensor 50 senses whether the 80 kPa suction pressure is continuously acting on the channel of the first suction line 31, and when the channel pressure of the first suction line 31 is less than or greater than 80 kPa, the control unit 170 can display it on the user monitor and start the buzzer.

[0200] In addition, as described above, when the suction pressure acting on the channel of the first suction line 31 is adjusted, the amount of electrolyte discharged from the bag 90 can be minimized during the degassing process, and degassing can be carried out safely within the most ideal time.

[0201] Therefore, each size of the bag 90 is pre-stored in the control unit 170, and the ideal suction pressure value corresponding to each size is pre-stored. Whenever the size of the bag 90 is changed, when the size of the bag 90 is input to the control unit 170, the opening range of the first pressure regulating valve 130 can be opened according to the size of the bag 90.

[0202] At this time, the size of the bag 90 and the suction pressure acting on the channel of the first suction line 31 corresponding to the size of the bag 90 are not limited to the above, and the operator can set the bag 90 according to its size to apply the most ideal suction pressure.

[0203] Three second vacuum pressure sensors 70 are used in total to sense the channel pressure of the second suction line 31 respectively.

[0204] At this point, a vacuum filter 40 can also be further installed in the second suction line 34. The vacuum filter 40 filters the electrolyte to prevent the electrolyte or dust from flowing into the precision control valves 80 installed in the second suction line 34.

[0205] During the degassing process of bag 90, the second vacuum pressure sensor 70 senses the pressure of each channel of the second suction line 34 in real time and transmits it to the control unit 170.

[0206] The control unit 170 also stores the reference pressure value of the passage of the second suction line 34.

[0207] Therefore, when electrolyte flows into one or more second intake lines 34, causing a decrease in the pressure of the channel and thus making the pressure value of the channel of the second intake line 34 different from the reference pressure value of the channel, the control unit 170 operates the precision control valve 80 installed in the second intake line 34 to close the channel.

[0208] In addition, the control unit 170 can display the inflow of electrolyte into the second suction line 34 on the operator monitor and notify the operator by making a buzzer installed in the degassing system sound.

[0209] A second Kez valve 120 can be applied and is connected together to three second suction lines 34.

[0210] Additionally, the second Kez valve 120 can be connected to the precision control valve 80 via the second suction line 34.

[0211] Therefore, when degassing bag 90, the second Kez valve 120 and the precision control valve 80 can be opened, and when the degassing operation of bag 90 is completed, the second Kez valve 120 and the precision control valve 80 can be closed.

[0212] The second pressure regulating valve 140 can be installed in the second suction line 34 and can be located between the second Kitz valve 120 and the second collection box 35.

[0213] The second pressure regulating valve 140 regulates the main pressure required for the vacuum of bag 90.

[0214] Therefore, the second pressure regulating valve 140 can be configured as a ball valve, and its operation is controlled by the aforementioned control unit 170.

[0215] Specifically, the second pressure regulating valve 140 can adjust the opening range of the passage of the second suction line 34 according to the size of the bag 90.

[0216] That is, the suction force of the second suction pump 36 acting on the passage of the second suction line 34 varies according to the opening range of the second pressure regulating valve 140. For example, when the lateral length of the bag 90 is 300 mm and the longitudinal length is 260 mm, the control unit 170 can control the second pressure regulating valve 140 so that the suction pressure of the second suction pump 36 acting on the passage of the second suction line 34 is approximately 80 kPa.

[0217] In this case, the second vacuum pressure sensor 70 senses whether the 80 kPa suction pressure is continuously acting on the channel of the second suction line 34, and when the channel pressure of the second suction line 34 is less than or greater than 80 kPa, the control unit 170 can display it on the user monitor and operate the buzzer.

[0218] In addition, as described above, when the suction pressure acting on the channel of the second suction line 34 is adjusted, the amount of electrolyte discharged from the bag 90 can be minimized during the degassing process, and degassing can be carried out safely within the most ideal time.

[0219] Therefore, the size of each bag 90 is pre-stored in the control unit 170, and the ideal suction pressure value corresponding to each size is pre-stored in the control unit 170. Whenever the size of the bag 90 is changed, when the size of the bag 90 is input to the control unit 170, the opening range of the second pressure regulating valve 140 can be opened according to the size of the bag 90.

[0220] At this time, the size of the bag 90 and the suction pressure acting on the passage of the second suction line 34 corresponding to the size of the bag 90 are not limited to the above, and the operator can set the bag 90 according to its size to apply the most ideal suction pressure.

[0221] Meanwhile, in the control unit 170, the degassing time or the amount of gas discharged from the second suction line 34 at predetermined intervals is set according to the size of the bag 90.

[0222] In addition, a total of three sensor units 180 are used, which are installed in the second suction line 34 respectively.

[0223] The sensor unit 180 can be disposed between the vacuum filter 40 and the precision control valve 80, which are respectively installed in the second suction line 34.

[0224] At this point, a ball valve can be used for the precision control valve 80.

[0225] The sensor unit 180 can be configured as a vacuum flow sensor, so that the amount of gas discharged through the second suction line 34 can be checked in real time during the degassing process of the bag 90.

[0226] The sensor unit 180 measures the amount of gas discharged from the second intake line 34 according to the control signal of the control unit 170, and then transmits it to the control unit 170.

[0227] In addition, the control unit 170 controls the operation of the sensor unit 180 according to a preset time, compares the gas discharge volume measured by the sensor unit 180 with a reference value defined according to the size of the bag 90, and detects whether the second inhalation line 34 is abnormal based on the comparison value.

[0228] For example, the electrolyte solidifies and blocks the passage of the second intake line 34 together with the gas, thereby reducing the amount of gas discharged within a predetermined time.

[0229] In this situation, the control unit 170 displays the abnormality of the second inhalation line 34 on the operator monitor and notifies the operator by emitting a sound from the buzzer installed in the degassing system.

[0230] In addition, the control unit 170 can be configured to control the operation of the second suction pump 36.

[0231] That is, in the control unit 170, the degassing time or gas discharge rate is set according to the size of the bag 90, so the suction pressure generated by the second suction pump 36 and the operating time of the second suction pump 36 can be set and controlled according to the size of the bag 90 to be degassed.

[0232] On the other hand, the degassing system for the secondary battery bag according to the present invention may further include: a first residual pressure removal unit 150, which removes residual pressure present in the first intake line 31 after removing the gas-mixed discharge from the interior of the separation unit 10; and a second residual pressure removal unit 160, which removes residual pressure present in the second intake line 34 after removing the gas-mixed discharge from the interior of the gas discharge path.

[0233] The first residual pressure removal unit 150 may include a first connecting line 151 and a first air conditioner 152.

[0234] The first connecting line 151 includes three first branch lines 1511 that are respectively connected to the first intake line 31 and connected to the first air conditioner 152.

[0235] A solenoid valve S1 can be installed in the first connecting line 151. The solenoid valve S1 closes the passage of the first intake line 31 only during the degassing process to prevent air from the first air conditioner 152 from flowing into the first intake line 31.

[0236] The first air conditioner 152 is connected to the first supply line 2110 of the air supply solenoid valve manifold 210. Additionally, the air supply solenoid valve manifold 210 is connected to the main air conditioner 200.

[0237] Therefore, the air discharged from the main air conditioner 200 passes sequentially through the air supply solenoid valve manifold 210, the first supply line 2110, the first air conditioner 152 and the first connecting line 151 before being supplied to the first intake line 31 to remove residual pressure in the passage of the first intake line 31.

[0238] The second residual pressure removal unit 160 may include a second connecting line 161 and a second air conditioner 162.

[0239] The second connecting line 161 includes three second branch lines 1611 that are respectively connected to the second intake line 34 and connected to the second air conditioner 162.

[0240] A solenoid valve S2 can be installed in the second connecting line 161. The solenoid valve S2 closes the passage of the second intake line 34 only during the degassing process to prevent air from flowing into the second intake line 34.

[0241] The second air conditioner 162 is connected to the second supply line 212 of the air supply solenoid valve manifold 210. Additionally, the air supply solenoid valve manifold 210 is connected to the aforementioned main air conditioner 200.

[0242] Therefore, the air discharged from the main air conditioner 200 passes sequentially through the air supply solenoid valve manifold 210, the second supply line 212, the second air conditioner 162, and the second connecting line 161 before being supplied to the second intake line 34 to remove residual pressure present in the passage of the second intake line 34.

[0243] In addition, the air supply solenoid valve manifold 210 is connected to the first Kez valve 110 via the third supply line 213, and to the second Kez valve 120 via the fourth supply line 214.

[0244] Therefore, when the air supply solenoid valve manifold 210 supplies air to the first intake line 31 and the second intake line 34, it also supplies air to the first Kez valve 110 and the second Kez valve 120 to remove residual pressure present in the first Kez valve 110 and the second Kez valve 120.

[0245] Next, refer to Figures 7 to 11 A gas removal method using a degassing system for a secondary battery bag according to the present invention will be described.

[0246] In the degassing method of the secondary battery bag according to the present invention, firstly (a) the adsorption plate 11 is adsorbed onto the first surface 92a and the second surface 92b respectively.

[0247] Specifically, the adsorption plate 11 moves forward by the forward / backward moving drive unit 13 to adsorb the first surface 92a and the second surface 92b respectively.

[0248] In addition, the degassing adsorption plate 12 disposed inside the adsorption plate 11 and the lower adsorption plate 14 disposed on the lower side of the adsorption plate 11 also move forward together with the adsorption plate 11 to adsorb the first surface 92a and the second surface 92b respectively.

[0249] At this time, the adsorption plate 11 and the degassing adsorption plate 12 sandwich the battery cell bag 92 and are arranged opposite each other to support each other, so that the first surface 92a and the second surface 92b can be stably adsorbed.

[0250] In addition, such as Figure 7 and Figure 8 As shown, when the adsorption plate 11 moves forward and backward by the forward / backward moving drive unit 13, the adsorption plate 11 simultaneously adsorbs the first surface 92a and the second surface 92b and then separates.

[0251] Subsequently, (b) the two adsorption plates 11 are pulled to create a space inside the battery cell pouch 92.

[0252] Specifically, the adsorption plate 11 moves backward again by the forward / backward moving drive 13 and simultaneously pulls the first surface 92a and the second surface 92b to form a larger space between the first surface 92a and the second surface 92b.

[0253] At this time, since the lower adsorption plate 14 also moves backward and pulls the first surface 92a and the second surface 92b respectively, a barrier is formed in the battery cell pouch 92, which ultimately prevents the electrolyte in the battery cell body 91 from rising to the position of the needle 21 inserted into the battery cell pouch 92.

[0254] After that, as Figure 9As shown, (c) after piercing the first surface 92a and the second surface 92b with needle 21, the gas inside the battery cell bag 92 is removed.

[0255] Specifically, the needle 21 moves forward via the needle drive unit 24, and a portion of the needle 21 is drawn out from the degassing adsorption plate 12 and enters the internal space of the battery cell pouch 92 through the first surface 92a and the second surface 92b respectively.

[0256] At the same time, the foreign object removal unit 30, which will be described later, operates to draw in air.

[0257] When the foreign object removal unit 30 draws in air, the gas inside the battery cell bag 92 is collected in the first collection box 32 and the second collection box 35.

[0258] Furthermore, even if the electrolyte moves into the insertion hole 111a, the foreign matter removal unit 30 will collect it by suction force.

[0259] After that, as Figure 10 As shown, the forward / backward moving drive unit 13 moves the adsorption plate 11 forward, and the drive source moves the lower adsorption plate 14 forward, thereby causing the first surface 92a and the second surface 92b to re-engage with each other. Then, as... Figure 11 As shown, a pair of sealing devices 100 located on the lower side of the lower adsorption plate 14 move forward relative to the first surface 92a and the second surface 92b to seal the lower part of the battery cell pouch 92.

[0260] Subsequently, after a preset time limit has elapsed, the needle drive unit 24 moves the needle 21 backward and leads it out to the outside of the battery cell pouch 92. The forward / backward movement drive unit 13 and the drive source move the adsorption plate 11 and the lower adsorption plate 14 backward respectively to separate them from the first surface 92a and the second surface 92b.

[0261] In addition, the sealing device 100 also moves backward together with the adsorption plate 11 and the lower adsorption plate 14.

[0262] At this time, the amount of gas generated inside the battery cell body 91 varies according to the size of the bag 90, and the time for the needle drive 24 to move the needle 21 backward varies according to the size of the bag 90.

[0263] Those skilled in the art will understand that the present invention can be implemented in other specific forms without altering the technical concept or essential features. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the invention is defined by the scope of the appended claims, not by the detailed description above, and the scope of the invention includes the meaning and scope of the claims and all modifications or variations derived from equivalent concepts.

Claims

1. A degassing system for a secondary battery bag, comprising a system for removing gas from the sealed edge of the secondary battery bag, the degassing system comprising: The separation section includes an air intake path for adsorbing the bag and pulling the bag to create a space inside the bag; A gas discharge section is installed in the separation section, and a needle with a gas discharge path formed inside is used to pierce the bag and discharge the gas inside the bag through the gas discharge path; as well as The foreign matter removal unit removes the discharge material, which is a mixture of gases that flowed into the separation unit and the gas discharge path, respectively. The foreign matter removal unit includes: A first inhalation line is connected to the inhalation path; The first collection box is connected to the first suction line; A first suction pump, connected to the first collection box, provides the required adsorption force to the separation section for the adsorption bag while simultaneously drawing in the exhaust mixed with gas through a suction operation. A second intake line is connected to the gas discharge path; A second collection box is connected to the second inhalation line; and The second suction pump is connected to the second collection box and draws in the exhaust mixture containing gas through a suction operation. The degassing system further includes: The control unit sets the degassing time or gas discharge rate through the second inhalation line according to the size of the bag; and The sensor unit measures the amount of gas discharged from the second suction line according to the control signal from the control unit and then transmits this measurement to the control unit. The control unit compares the gas discharge volume measured by the sensor unit with a reference value defined according to the size of the bag, and detects whether the second inhalation line is abnormal based on the comparison value.

2. The degassing system for the secondary battery bag according to claim 1, further comprising: A filter is connected to the first and second inhalation lines respectively, and filters the exhaust mixture containing gas.

3. The degassing system for the secondary battery bag according to claim 1, further comprising: A first vacuum pressure sensor senses the pressure inside the first suction line; A solenoid valve is connected to the first suction line and opens or closes the first suction line based on whether the first vacuum pressure sensor senses the pressure inside the first suction line. The second vacuum pressure sensor senses the pressure inside the second suction line; as well as A precision control valve is connected to the second suction line and opens or closes the second suction line based on whether the second vacuum pressure sensor senses pressure within the second suction line.

4. The degassing system for the secondary battery bag according to claim 3, further comprising: A first open valve is connected to the solenoid valve via the first suction line; as well as The second open valve is connected to the precision control valve via the second suction line.

5. The degassing system for a secondary battery bag according to claim 1, further comprising: The first pressure regulating valve adjusts the opening range of the first suction line according to the size of the bag, so that the suction pressure of the first suction pump acting on the first suction line is different. as well as The second pressure regulating valve adjusts the opening range of the second suction line according to the size of the bag, so that the suction pressure of the second suction pump acting on the second suction line is different.

6. The degassing system for a secondary battery bag according to claim 1, further comprising: The first residual pressure removal unit, after removing the gas-mixed effluent from inside the separation unit, removes the residual pressure present in the first suction line. The first residual pressure removal unit includes: A first connecting line is connected to the first suction line; and A first air conditioner supplies air to the first connecting line so that air flows into the first intake line.

7. The degassing system for a secondary battery bag according to claim 1, further comprising: The second residual pressure removal unit, after removing the gas-mixed effluent from inside the gas discharge path, removes the residual pressure present in the second suction line. The second residual pressure removal unit includes: A second connecting line is connected to the second suction line; and The second air conditioner supplies air to the second connecting line so that air flows into the second intake line.

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