Degassing apparatus for pouch for secondary battery and degassing method using the same

Abstract

The present invention relates to a degassing apparatus for a pouch of a secondary battery and a degassing method using the same, and aims to completely remove gas regardless of the size of a battery cell pouch, and to reduce the unit price of a product by simplifying the structure while securing quality. The degassing apparatus for a pouch of a secondary battery of the present invention includes a separation part including an adsorption plate adsorbing at least one face of a pouch, and pulling the adsorption plate to form a space inside the pouch, and a gas removing part puncturing the pouch with a needle provided in the adsorption plate and having a gas discharge path formed inside, and removing gas inside the pouch through the gas discharge path. The degassing method for a pouch of a secondary battery of the present invention includes the steps of (a) adsorbing at least one face of a pouch by an adsorption plate, (b) pulling the adsorption plate by a separation part to form a space inside the pouch, and (c) after perforating the pouch with a needle having a gas discharge path formed inside, removing gas inside the pouch through the gas discharge path.

Description

Technical Field

[0001] This invention relates to a degassing device for a secondary battery bag, and more specifically, to a degassing device for a secondary battery bag that can completely remove gas and other foreign matter present inside the bag during the manufacturing process of the secondary battery bag through a simplified structure, and a degassing method using the degassing device. 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. In order to capture the generated gas, the size of the outer material of the pouch-type secondary battery before the activation process is formed to be 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 of the prior art mentioned above, and its purpose is to provide a degassing device for a secondary battery bag and a degassing method using the degassing device, which can completely remove gas regardless of the size of the battery cell bag.

[0020] Another objective of the present invention is to provide a degassing device for a secondary battery bag and a degassing method using the degassing device, which can reduce the unit price of the product through a simplified structure while ensuring quality.

[0021] (II) Technical Solution

[0022] The degassing device for a secondary battery bag according to the present invention includes: a separation section comprising an adsorption plate adsorbing at least one side of the bag, and pulling the adsorption plate to form a space inside the bag; and a gas removal section comprising piercing the bag with a needle disposed in the adsorption plate and having a gas discharge path formed therein, and removing the gas inside the bag through the gas discharge path.

[0023] In addition, the separation section further includes a degassing adsorption plate, which adsorbs the bag inside the adsorption plate, and includes a guide hole for introducing or withdrawing the needle.

[0024] In addition, the space between the inside of the adsorption plate, the outside of the degassing adsorption plate, and the bag is a watertight structure and forms a vacuum.

[0025] Furthermore, an air intake hole is formed in the separation section, and the degassing device further includes a foreign matter removal section, which is connected to the air intake hole and removes foreign matter from inside the separation section by air intake.

[0026] In addition, the separation section further includes a forward / backward movement drive section that moves the adsorption plate forward and backward to separate each surface of the bag from each other.

[0027] In addition, the degassing device further includes a lower adsorption plate, which is disposed below the separation section and adsorbs onto at least one side of the bag.

[0028] Additionally, the gas removal unit includes: an exhaust pipe connected to the gas discharge path; a needle drive unit that drives the needle to move the needle toward the inside or outside of the bag; and an intake control unit connected to the gas discharge path that, when the needle is introduced into the bag, exhausts the gas inside the bag by air intake.

[0029] Furthermore, the degassing device further includes a variable section that changes the lead-out length of the needle. The variable section includes: a moving guide section coupled to the needle drive section; a moving section coupled to the exhaust pipe and moving forward or backward within the moving guide section; a variable guide section coupled to the moving guide section and including a variable guide hole; a variable control section that moves the moving section forward while moving along the variable guide hole; and a spring that is housed together in the internal space of the moving guide section and the moving section and provides a restoring force to the moving section for backward movement.

[0030] In addition, the degassing device further includes at least one fixed adsorption plate, which adsorbs and fixes the bag on the opposite side of the bag that is in contact with the separation section.

[0031] Furthermore, the fixed adsorption plate is fixed or moved in the opposite direction to the separation section, and the degassing device further includes a second gas removal section, which uses a needle disposed in the fixed adsorption plate and having a gas discharge path formed inside to pierce the bag and remove the gas inside the bag through the gas discharge path.

[0032] The degassing method for a secondary battery bag according to the present invention includes the following steps: (a) an adsorption plate adsorbs at least one side of the bag; (b) a separation section pulls the adsorption plate to form a space inside the bag; and (c) after perforating the bag with a gas discharge path formed inside, the gas inside the bag is removed through the gas discharge path.

[0033] In addition, step (b) further includes the following steps: attaching a lower adsorption plate to the lower side of the separation section to adsorb and pull the lower part of the bag.

[0034] Additionally, step (c) further includes the following steps: (c1) moving the needle to introduce the needle into the interior of the bag; (c2) when the needle is introduced into the interior of the bag, venting the gas inside the bag by air intake; and (c3) after a preset time limit has elapsed, withdrawing the needle to the outside of the bag.

[0035] In addition, step (b) further includes the following steps: a fixed adsorption plate located on the opposite side of the bag connected to the separation section adsorbs and fixes the bag or pulls the bag.

[0036] In addition, step (c) further includes the following steps: forming micropores in the bag using a needle disposed in the fixed adsorption plate and having a gas discharge path formed inside, and removing the gas inside the bag through the gas discharge path.

[0037] (III) Beneficial Effects

[0038] The degassing device for the secondary battery bag according to the present invention can completely remove gas, regardless of the size of the battery cell bag.

[0039] In addition, a simplified structure can reduce the unit price of the product while ensuring quality. Attached Figure Description

[0040] Figure 1 and Figure 2 This is a perspective view showing a degassing device for a secondary battery bag according to the present invention.

[0041] Figure 3 This is a perspective view showing the separation section and the gas removal section of the degassing device applied to the secondary battery bag according to the present invention.

[0042] Figure 4 This is a front view showing a degassing device for a secondary battery bag according to the present invention.

[0043] Figure 5 This diagram illustrates the separation section, gas removal section, and foreign matter removal section of the degassing device applied to the secondary battery bag according to the present invention.

[0044] Figure 6 This is a cross-sectional view showing the variable part of the degassing device applied to the secondary battery bag according to the present invention.

[0045] Figures 7 to 12This diagram illustrates the steps of a process for removing gas from the inside of a battery cell pouch using a degassing method according to the present invention.

[0046] Explanation of reference numerals in the attached figures

[0047] 1: Degassing device; 10: Separation section

[0048] 11: Adsorption plate 111: Main body

[0049] 111a, 41a: Insertion holes; 111b, 41b: Suction holes

[0050] 12: Degassing adsorption plate 12a: Guide hole

[0051] 13: Forward / backward movement drive unit 131: Upper plate

[0052] 131a: Moving guide hole; 132: Motor

[0053] 133: Housing 134: Guide rail

[0054] 135: Sliding part; 136: Connecting block

[0055] 137: Connecting shaft; 14: Lower adsorption plate

[0056] 141: Lower main body 20: Gas removal section

[0057] 21: Needle 22: Exhaust pipe

[0058] 23: Variable part 231: Movement guidance part

[0059] 2311: First support plate; 232: Bracket

[0060] 233: Moving part; 2331: Second support plate

[0061] 234: Variable guidance unit; 235: Variable control unit

[0062] 2351: Propulsion Unit; 236: Spring

[0063] 24: Needle drive unit 241: Piston

[0064] 25: Inhalation control unit 251: Inhalation hose

[0065] 30: Foreign object removal unit; 31: Suction nozzle

[0066] 32: Inhalation section; 40: Fixed adsorption plate

[0067] 41: Fixed main body; 50: Second gas removal unit

[0068] 51: Second needle 52: Second exhaust pipe

[0069] 53: Second needle drive unit; 54: Second inhalation control unit

[0070] 60: Additional sliding part; 70: Additional connecting block

[0071] 80: Additional connecting shaft; 90: Bag

[0072] 91: Battery cell body 92: Battery cell bag

[0073] 92a: First surface; 92b: Second surface

[0074] 100: Sealing device Detailed Implementation

[0075] 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.

[0076] 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 scope of the invention, which is defined by the scope of the claims. Throughout this specification, the same reference numerals refer to the same elements.

[0077] 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.

[0078] Figure 1 and Figure 2 This is a perspective view showing a degassing device for a secondary battery bag according to the present invention. Figure 3 This is a perspective view showing the separation section and the gas removal section of the degassing device applied to the secondary battery bag according to the present invention. Figure 4 This is a front view showing the degassing device for a secondary battery bag according to the present invention. Figure 5 This diagram illustrates the separation section, gas removal section, and foreign matter removal section of the degassing device applied to the secondary battery bag according to the present invention. Figure 6 This is a cross-sectional view showing the variable part of the degassing device applied to the secondary battery bag according to the present invention. Figures 7 to 12 This is a diagram illustrating the steps of a process for removing gas from the inside of a battery cell pouch by degassing a secondary battery pouch according to the present invention.

[0079] The degassing device 1 for a secondary battery bag according to the present invention is a product in which gas and other foreign matter present inside the bag 90 can be completely removed by a simplified structure during the manufacturing process of the secondary battery bag (hereinafter referred to as "bag").

[0080] At this time, the pouch 90 can mainly include the battery cell body 91 and the battery cell pocket 92.

[0081] 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.

[0082] 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.

[0083] In order to remove the gas present in the internal space of the battery cell bag 92, the degassing device 1 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; and a gas removal section 20 for removing the gas present in the internal space of the battery cell bag 92.

[0084] The separation section 10 is used to separate the first surface 92a and the second surface 92b so that the suction section 32, which will be described later, can suck 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.

[0085] At this point, the number of separation sections 10 can be increased or decreased depending on the size of the bag 90.

[0086] The main body 111 can be formed into a polygonal block with a predetermined thickness and area.

[0087] An insertion hole 111a and an air intake hole 111b are formed inside the main body 111. A needle 21 and an exhaust pipe 22, which are part of the gas removal section 20 to be described later, are inserted into the insertion hole 111a. A foreign matter removal section 30 to be described later is provided in the air intake hole 111b.

[0088] At this time, the insertion hole 111a is formed along the horizontal length direction of the main body 111, and the suction hole 111b is formed on the upper side of the main body 111 in the vertical direction and is connected to the insertion hole 111a.

[0089] 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.

[0090] Furthermore, when it is necessary to increase the gas removal rate, the number of insertion holes 111a, needles 21 and exhaust pipes 22 can be changed according to various conditions such as the size of the bag 90.

[0091] An adsorption plate 11 is formed at the front of the main body 111, which separates the first surface 92a from the second surface 92b by interacting with the forward / backward moving drive unit 13, which will be described later.

[0092] 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.

[0093] The foreign object removal unit 30 discharges foreign objects present in the insertion hole 111a of the main body 111 to the outside.

[0094] Specifically, the gas removal unit 20 can expel the gas inside the battery cell body 91 by suction force. In this process, it can even suck in the electrolyte contained inside the battery cell body 91 and move it to the insertion hole 111a. The foreign matter removal unit 30 removes the electrolyte that has moved to the insertion hole 111a.

[0095] Therefore, the foreign object removal unit 30 may include: a suction nozzle 31 disposed in a suction hole 111b; and a suction unit 32 connected to the suction nozzle 31.

[0096] At this time, the suction unit 32 can be formed from a known product with a pump or air suction function.

[0097] Therefore, when the suction unit 32 is operated to generate suction force, the electrolyte and foreign matter in the insertion hole 111a are sucked into the suction unit 32 through the suction nozzle 31.

[0098] The degassing adsorption plate 12 is adsorbed together with the adsorption plate 11 on the first surface 92a while it is fixed to the adsorption plate 11.

[0099] Similar to needle 21, two degassing adsorption plates 12 are used.

[0100] Inside the degassing adsorption plate 12, there is a guide hole 12a for introducing or withdrawing needles 21.

[0101] At this time, at the front end of the adsorption plate 11, the connecting hole, guide hole 12a and insertion hole 111a for allowing the needle 21 to move toward the degassing adsorption plate 12 are on the same line.

[0102] 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.

[0103] 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, thereby enabling the gas removal section 20, which will be described later, to completely remove the gas inside the battery cell bag 92.

[0104] 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.

[0105] 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.

[0106] The lower adsorption plate 14 can be formed in the same shape as the adsorption plate 11.

[0107] That is, one lower adsorption plate 14 faces the first surface 92a, and the other lower adsorption plate 14 faces the second surface 92b.

[0108] In addition, the lower adsorption plate 14 can be positioned lower than the main body 111.

[0109] 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.

[0110] 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.

[0111] The drive source operates simultaneously with the forward / backward movement drive unit 13, which will be described later.

[0112] 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.

[0113] 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.

[0114] 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 it from the second surface 92b.

[0115] 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.

[0116] At this time, the lower adsorption plate 14 can also be positioned below the fixed adsorption plate 40, which will be described later.

[0117] 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.

[0118] On the other hand, the aforementioned main body 111 can be positioned in front of the coupler C, which is formed in a roughly "┓" cross-sectional shape.

[0119] The connector C serves as a medium for connecting the main body 111 and the forward / backward movement drive unit 13.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] On the other hand, as described above, the gas removal unit 20 removes gas from the internal space of the pouch portion separated from the first surface 92a and the second surface 92b by the separation unit 10, and the gas removal unit 20 may include at least one of the needle 21, the exhaust pipe 22, the variable part 23, the needle drive part 24 and the inhalation control part 25.

[0125] 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.

[0126] 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.

[0127] Inside the needle 21, a gas discharge path is formed along the length direction for discharging gas from the battery cell pouch 92.

[0128] 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.

[0129] 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.

[0130] The internal space of the exhaust pipe 22 and the gas discharge path of the needle 21 are connected to each other.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] The movable part 233 is connected to the movable guide part 231 and fixed to the bracket 232.

[0137] 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.

[0138] The movable part 233 can be movably connected to the movable guide part 231.

[0139] 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.

[0140] 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.

[0141] A variable guide hole is formed on the surface of the variable guide section 234 that faces the moving section 233.

[0142] 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.

[0143] At this time, interlocking threads are formed on the inner periphery of the variable guide hole and the outer periphery of the pusher 2351.

[0144] 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 by the bracket 232 and the needle 21 installed in the exhaust pipe 22 forward.

[0145] 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.

[0146] On the outer peripheral surface of the variable control unit 235, a scale for indicating the length of the needle 21 being introduced or withdrawn, and a corresponding number, can be printed.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] The intake control unit 25 is used to expel gas from the battery cell bag 92 and can be formed from a known product with a pump or air intake function.

[0155] The inhalation hose 251 included in the inhalation control unit 25 is connected to the end of the exhaust pipe 22. When the needle 21 is introduced into the internal space of the battery cell bag 92, the gas present in the internal space of the battery cell bag 92 is inhaled by air intake and discharged to the outside.

[0156] Next, refer to Figure 5 The fixed adsorption plate 40 and the second gas removal section 50 applied to the bag 90 according to the present invention will be described.

[0157] The fixed adsorption plate 40 adsorbs and fixes the opposite side of the bag 90 that is in contact with the adsorption plate 11, namely the second surface 92b of the battery cell bag 92, so that the separation part 10 can easily pull the first surface 92a to separate from the second surface 92b.

[0158] The number of fixed adsorption plates 40 can be the same as the number of adsorption plates 11.

[0159] The fixed adsorption plate 40 can be formed as an elliptical ring to be adsorbed in many areas of the second surface 92b, and can be formed along the front edge of the fixed body 41.

[0160] The fixed adsorption plate 40 may further include a fixed body 41 formed in the shape of a polygonal block.

[0161] In addition, an additional degassing adsorption plate 43 with the same shape as the aforementioned degassing adsorption plate 12 can be formed inside the fixed adsorption plate 40.

[0162] Of course, the additional degassing adsorption plate 43 also has a guide hole 43a for guiding the introduction or withdrawal of the second needle 51.

[0163] In one example, the fixed adsorption plate 40 can be adsorbed onto the second surface 92b in a fixed state. In this case, with the fixed adsorption plate 40 in contact with the second surface 92b, the forward / backward movement drive unit 13 moves only the adsorption plate 11 and the degassing adsorption plate 12 forward and backward, thereby pulling only the first surface 92a.

[0164] At this time, when the adsorption plate 11 and the degassing adsorption plate 12 pressurize and adsorb the first surface 92a, the fixed adsorption plate 40 supports the battery cell bag 92 to prevent the battery cell bag 92 from being pushed.

[0165] Then, the fixed adsorption plate 40 is naturally adsorbed onto the second surface 92b by the pressure applied by the adsorption plate 11 and the degassing adsorption plate 12.

[0166] Therefore, when the adsorption plate 11 and the degassing adsorption plate 12 move backward, the fixed adsorption plate 40 holds the second surface 92b.

[0167] In another example, such as Figure 4 As shown, the fixed adsorption plate 40 and the adsorption plate 11 can be moved forward or backward simultaneously relative to the second surface 92b by the forward / backward moving drive unit 13.

[0168] Therefore, the degassing device 1 for a secondary battery bag according to the present invention may include: an additional sliding part 60 that moves in two directions along a guide rail 134 on the upper surface of the housing 133; an additional mounting ring (not shown) formed on the lower side of the additional sliding part 60 and mounted on the outer periphery of a rotating shaft inside the housing 133, the inner periphery of which is formed with a thread that can move in two directions along a left-hand thread of the rotating shaft; an additional connecting block 70 fixed to the upper surface of an additional connector C' that is coupled to a fixing body 41; and an additional connecting shaft 80 that connects the two sides of the additional sliding part 60 and the additional connecting block 70 and moves forward or backward in the moving guide hole 131a.

[0169] Therefore, when the motor 132 rotates the rotating shaft in the forward direction, the additional mounting ring moves forward along the left-hand thread and gradually moves towards the center of the rotating shaft, thus approaching the mounting ring. When the motor 132 rotates the rotating shaft in the reverse direction, the additional mounting ring moves backward along the right-hand thread, thus gradually moving away from the mounting ring. Furthermore, when the additional mounting ring moves forward, the additional sliding part 60, the additional connecting block 70, the additional connecting shaft 80, the additional connector C', and the fixing body 41 all move forward to allow the fixing adsorption plate 40 to adhere to the second surface 92b. In this state, when the additional mounting ring moves backward, the additional sliding part 60, the additional connecting block 70, the additional connecting shaft 80, the additional connector C', and the fixing body 41 all move backward, ultimately causing the fixing adsorption plate 40 to pull the second surface 92b and separate from the first surface 92a.

[0170] The second gas removal unit 50 may include: a second needle 51, which is inserted into the insertion hole 41a of the fixing body 41 and has a gas discharge path formed inside it, and pierces the second surface 92b; a second exhaust pipe 52, which is installed in an additional mounting pipe 511 provided at the end of the second needle 51; a second needle driving unit 53, which is used to move the second needle 51 forward or backward relative to the second surface 92b; and a second suction control unit 54, which is connected to the second exhaust pipe 52 and uses air suction to draw in the gas present in the internal space of the battery cell pouch 92 and discharge it to the outside.

[0171] In addition, an additional mounting pipe 511 is installed on the outer periphery of the end of the second exhaust pipe 52, which is located at the end of the second needle 51.

[0172] At this time, an insertion hole 41a and an air intake hole 41b are formed inside the fixed body 41. A second needle 51 and a second exhaust pipe 52, which constitute part of the second gas removal part 50 to be described later, are inserted into the insertion hole 41a. The air intake hole is provided with a foreign matter removal part 30.

[0173] The insertion hole 41a of the fixing body 41 is formed along the horizontal length direction of the fixing body 41, and the suction hole 41b is formed on the upper side of the fixing body 41 in the vertical direction and is connected to the insertion hole 41a.

[0174] In addition, multiple insertion holes 41a can be formed, and the same number of second needles 51 and second exhaust pipes 52, which will be described later, can be applied to each insertion hole 41a.

[0175] In addition, similar to needle 21, the second needle 51 can be composed of two, i.e., a pair, and can be inserted into the insertion hole 41a of the fixing body 41 respectively.

[0176] Each of the structures and operations of the second gas removal unit 50 described above is the same as that of the gas removal unit 20 described above, therefore its detailed description will be omitted.

[0177] However, since the inhalation force generated by the inhalation control unit 25 and the second inhalation control unit 54 need not be the same, the inhalation force of the second inhalation control unit 54 can be set to be less than the inhalation force of the inhalation control unit 25.

[0178] In this situation, the inhalation control unit 25 can inhale a large amount of gas, and the second inhalation control unit 54 can assist the inhalation control unit 25 in inhaling gas, so that the gas in the battery cell bag 92 can be inhaled and exhaled in a shorter time.

[0179] Next, refer to Figures 7 to 12 The gas removal method of the degassing device using the above-mentioned secondary battery bag is described.

[0180] 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.

[0181] Specifically, the adsorption plate 11 moves forward by the forward / backward moving drive 13 to adsorb the first surface 92a.

[0182] 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, thereby adsorbing the first surface 92a and the second surface 92b respectively, and fixing the adsorption plate 40 to adsorb the second surface 92b.

[0183] At this time, when the fixed adsorption plate 40 and the fixed body 41 are stationary, the fixed adsorption plate 40 can support the second surface 92b, so the adsorption plate 11 can stably adsorb the first surface 92a. In addition, the second surface 92b is pressed tightly against the fixed adsorption plate 40 by the pressure generated during the adsorption process of the adsorption plate 11 adsorbing the first surface 92a, and finally the fixed adsorption plate 40 also stably adsorbs the second surface 92b.

[0184] And, as Figure 7 and Figure 8 As shown, when the fixed adsorption plate 40 moves forward and backward by the forward / backward moving drive unit 13, the adsorption plate 11 and the fixed adsorption plate 40 simultaneously adsorb the first surface 92a and the second surface 92b, respectively.

[0185] Next, (b) the adsorption plate 11 and the fixed adsorption plate 40 are pulled to form a space inside the battery cell pouch 92.

[0186] Specifically, the adsorption plate 11 moves backward again and pulls the first surface 92a by the forward / backward moving drive unit 13. At the same time, as described above, the fixed adsorption plate 40 supports and adsorbs the second surface 92b in a stationary state, or moves forward and adsorbs the second surface 92b by the forward / backward moving drive unit 13 and then moves backward to pull the second surface 92b, thereby forming a larger space between the first surface 92a and the second surface 92b.

[0187] 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.

[0188] After that, as Figure 9 As shown, (c) after the first surface 92a is pierced with needle 21, the gas in the battery cell bag 92 is removed by suction control unit 25.

[0189] Specifically, the needle 21 moves forward via the needle drive 24, and a portion of the needle 21 is drawn out from the degassing adsorption plate 12 and penetrates the first surface 92a to be introduced into the internal space of the battery cell pouch 92.

[0190] At the same time, the intake control unit 25 and the foreign object removal unit 30 operate simultaneously to intake air.

[0191] When the intake control unit 25 draws in air, the gas inside the battery cell bag 92 is drawn into the intake control unit 25 in sequence through the gas discharge path and the exhaust pipe 22.

[0192] Furthermore, if the electrolyte moves into the insertion hole 111a by the suction force of the gas removal unit 20, the foreign matter removal unit 30 will draw in and remove the electrolyte present in the insertion hole 111a by air suction.

[0193] Furthermore, the second gas removal unit 50 also operates together with the gas removal unit 20 to draw in and remove gas from inside the battery cell pouch 92. Therefore, the time required to remove gas from inside the battery cell pouch 92 can be shortened.

[0194] After that, as Figure 10 As shown, the forward / backward moving drive unit 13 moves the adsorption plate 11 and the fixed adsorption plate 40 forward respectively, and the drive source moves the lower adsorption plate 14 forward, thereby causing the first surface 92a and the second surface 92b to re-contact 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.

[0195] like Figure 12 As shown, thereafter, when 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, the fixed adsorption plate 40 and the lower adsorption plate 14 backward respectively to separate them from the first surface 92a and the second surface 92b.

[0196] In addition, the sealing device 100 also moves backward together with the adsorption plate 11, the fixed adsorption plate 40 and the lower adsorption plate 14.

[0197] 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.

[0198] 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 device of a pouch for a secondary battery, which is a device for removing gas from a pouch for a secondary battery having a sealed edge, the degassing device comprising: a separation part including an adsorption plate that adsorbs at least one face of the pouch and pulls the adsorption plate to form a space inside the pouch; and a gas removing part that punctures the pouch with a needle provided in the adsorption plate and having a gas discharge path formed inside, and removes gas inside the pouch through the gas discharge path, the separation part further including: a degassing adsorption plate that adsorbs inside the adsorption plate and includes a guide hole through which the needle is introduced or withdrawn, a space between the inside of the adsorption plate, the outside of the degassing adsorption plate, and the pouch being a water-tight structure and forming a vacuum state. 2.The degassing device of a pouch for a secondary battery according to claim 1, wherein an air intake hole is formed in the separation part, the degassing device further includes a foreign matter removing part connected to the air intake hole and discharging foreign matter inside the separation part by air suction. 3.The degassing device of a pouch for a secondary battery according to claim 1, wherein the separation part further includes a forward / backward movement driving part that moves the adsorption plate forward and backward to separate each surface of the pouch from each other. 4.The degassing device of a pouch for a secondary battery according to claim 1, further comprising: a lower adsorption plate provided at a lower side of the separation part and adsorbing at least one face of the pouch. 5.The degassing device of a pouch for a secondary battery according to claim 1, wherein the gas removing part includes: an exhaust pipe connected to the gas discharge path; a needle driving part that moves the needle by driving to move the needle inside or outside the pouch; and a suction control part connected to the gas discharge path, discharging gas inside the pouch by air suction when the needle is introduced inside the pouch. 6.The degassing device of a pouch for a secondary battery according to claim 5, further comprising: a variable part that changes an introduction length of the needle, the variable part including: a movement guide part coupled to the needle driving part; a movement part coupled to the exhaust pipe and moving forward or backward in the movement guide part; a variable guide part coupled to the movement guide part and including a variable guide hole; a variable control part that moves the movement part forward while moving along the variable guide hole; and a spring that is collectively accommodated in an inner space of the movement guide part and the movement part and provides a restoring force for backward movement to the movement part. 7.The degassing device of a pouch for a secondary battery according to claim 1, further comprising: at least one fixed adsorption plate that adsorbs and fixes the pouch at a face opposite to the separation part. 8.The degassing device of a pouch for a secondary battery according to claim 7, wherein the fixed adsorption plate is fixed or moved in a direction opposite to the separation part, ​ The degassing device further includes a second gas removing part that punctures the bag with a needle provided in the fixed adsorption plate and internally formed with a gas discharge path, and removes the gas inside the bag through the gas discharge path.

9. A degassing method of a pouch for a secondary battery, which is a method of removing gas from a pouch for a secondary battery having a sealed edge, the degassing method comprising the steps of: (a) an adsorption plate adsorbing at least one side of the pouch; (b) a separation part pulling the adsorption plate to form a space inside the pouch; and (c) after perforating the pouch with a needle internally formed with a gas discharge path, removing the gas inside the pouch through the gas discharge path, the step (c) includes the steps of: (c2) when the needle is introduced into the inside of the pouch, discharging the gas inside the pouch by air suction, the separation part includes a degassing adsorption plate that adsorbs the pouch inside the adsorption plate and includes a guide hole that introduces or leads out the needle, a space between the inside of the adsorption plate, the outside of the degassing adsorption plate, and the pouch is a water-tight structure and forms a vacuum state.

10. The degassing method of a pouch for a secondary battery according to claim 9, wherein the step (b) further includes the step of: a lower adsorption plate coupled to the lower side of the separation part adsorbing and pulling the lower part of the pouch.

11. The degassing method of a pouch for a secondary battery according to claim 9, wherein the step (c) further includes the steps of: (c1) moving the needle to introduce the needle into the inside of the pouch; and (c3) when a preset limit time elapses, leading the needle out to the outside of the pouch.

12. The degassing method of a pouch for a secondary battery according to claim 9, wherein the step (b) further includes the step of: a fixed adsorption plate located at the opposite side of the pouch from the separation part adsorbing and fixing the pouch or pulling the pouch.

13. The degassing method of a pouch for a secondary battery according to claim 12, wherein the step (c) further includes the steps of: a needle provided in the fixed adsorption plate and internally formed with a gas discharge path forms a micro-hole in the pouch, and removes the gas inside the pouch through the gas discharge path.

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