Sealing device for secondary battery bag and sealing method for secondary battery bag using same

Abstract

The present disclosure relates to a secondary battery pouch sealing device for sealing a sealing portion of a second pouch for collecting gas and a sealing method of a secondary battery pouch using the same, and to such a secondary battery pouch sealing device and a sealing method of a secondary battery pouch using the same. Comprising a first sealing tool arranged on one side of a sealing part to seal the sealing part by pressing and heating; a friction pad part connected with the first sealing tool and including a first friction pad and a second friction pad each provided at one of both ends of one surface of the sealing part; and a driving member that moves the first sealing tool and the friction pad portion to one side or the other side; and a second sealing unit including a second sealing tool disposed on the other side of the sealing portion to seal the sealing portion by pressing and heating.

Description

Technical Field

[0001] This application claims the benefit of priority from Korean Patent Application No. 2023-0134986, filed on October 11, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present disclosure relates to a sealing device for a secondary battery bag and a sealing method for a secondary battery bag using the sealing device, and more particularly to a sealing device for a secondary battery bag that seals a sealing portion of an air bag for capturing gas while pulling both ends of the sealing portion and a sealing method for a secondary battery bag using the sealing device. Background Art

[0003] With the development of mobile device technology and the growing demand for it, secondary batteries that can be charged and discharged have been used as energy sources for various mobile devices. Secondary batteries are also attracting attention as energy sources for electric vehicles and hybrid electric vehicles, which are alternatives to existing gasoline and diesel vehicles that use fossil fuels.

[0004] Depending on the shape of the battery case, secondary batteries are classified into cylindrical batteries with an electrode assembly mounted in a cylindrical metal can, prismatic batteries with an electrode assembly mounted in a prismatic metal can, or pouch-type batteries with an electrode assembly mounted in a pouch-type case made of an aluminum laminate sheet.

[0005] A conventional pouch-type lithium secondary battery manufacturing process includes building an electrode assembly into a receiving space of a battery case made of a laminated sheet, filling the battery case with an electrolyte, sealing the battery case, and performing an activation process.

[0006] Meanwhile, during the activation process, a large amount of gas is generated due to chemical reactions and side reactions between the electrolyte and the electrodes, and in order to capture the gas, the battery case is provided with a space for gas capture in addition to a space configured to accommodate the electrode assembly.

[0007] The sealing performed before the activation process is to seal the port for injecting electrolyte, which is generally called V-sealing.

[0008] Figure 1 : is a diagram showing a conventional device for sealing an air bag of a battery case. Figure 1 The conventional sealing device includes: an up and down driving unit 1 configured to move the soft package upward and downward, a heater block 2 configured to move forward and backward, a pair of pressing blocks 3 configured to use the heater block 2 to heat-seal the opening of the soft package, a cylinder 4 configured to move forward and backward, a rod 5 configured to move forward and backward, a rod housing 6 and a clamping plate 7.

[0009] However, if the opening of the soft pack is not closed or the sealing surfaces facing each other are not aligned with each other, wrinkles may occur in the seal.

[0010] (Prior art literature)

[0011] (Patent Document 1) Korean Patent Application Publication No. 10-2017-0062402 Summary of the Invention

[0012] Technical issues

[0013] The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a secondary battery pouch sealing apparatus having a function capable of preventing wrinkles from being generated in the secondary battery pouch when sealing the pouch, and a secondary battery pouch sealing method using the same.

[0014] Technical Solution

[0015] As a technical means for achieving the above-mentioned purpose, a sealing device for a secondary battery bag according to an embodiment of the present disclosure is a sealing device for a secondary battery bag for sealing a sealing portion 11c of a second bag 11b for capturing gas, comprising: a first sealing unit, comprising: a first sealing tool 110, arranged on one side of the sealing portion 11c to press and heat the sealing portion 11c so that the sealing portion is sealed; a friction pad portion 120, connected to the first sealing tool 110, the friction pad portion comprising a first friction pad 121 and a second friction pad 122 arranged at both ends of one surface of the sealing portion 11c; and a driving member 130, configured to move the first sealing tool 110 and the friction pad portion 120 to one side or the other; and a second sealing unit 200, the second sealing unit 200 comprising a second sealing tool 210, arranged on the other side of the sealing portion 11c to press and heat the sealing portion 11c so that the sealing portion is sealed.

[0016] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, the first friction pad 121 can be set on one side of one surface of the sealing part 11c, and after contacting the one surface of the sealing part 11c, a force is applied to the first friction pad to pull the sealing part 11c to one side, and the second friction pad 122 can be set on the other side of one surface of the sealing part 11c, and after contacting the one surface of the sealing part 11c, a force is applied to the second friction pad to pull the sealing part 11c to the other side.

[0017] Furthermore, in the sealing apparatus of the secondary battery pouch according to an embodiment of the present disclosure, the first and second friction pads 121 and 122 may be closer to the sealing portion 11 c than the first sealing tool 110 to contact the sealing portion 11 c before the first sealing tool 110 .

[0018] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, the driving member 130 may include: a cylinder 131; a first sealing tool rod 132, one side of which is connected to the cylinder 131 and the other side is connected to the first sealing tool 110, and the first sealing tool rod is configured to provide a driving force to the first sealing tool 110 so that the first sealing tool can move to one side or the other; a first friction pad rod 133, one side of which is connected to the first sealing tool rod 132 and the other side is connected to the first friction pad 121; and a second friction pad rod 134, one side of which is connected to the first sealing tool rod 132 and the other side is connected to the second friction pad 122.

[0019] In addition, the sealing device of the secondary battery bag according to an embodiment of the present disclosure may include an elastic portion 140, including a first elastic unit 141, which is located between the first sealing tool rod 132 and the first friction pad rod 133, and the first elastic unit is configured to provide a rotational elastic force to the first friction pad rod 133; and a second elastic unit 142, which is located between the first sealing tool rod 132 and the second friction pad rod 134, and the second elastic unit is configured to provide a rotational elastic force to the second friction pad rod 134.

[0020] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, when the first friction pad rod 133 is further moved by the driving member 130 after the first friction pad 121 contacts one surface of the sealing portion 11c, the first friction pad rod can be rotated in an outward direction by the first elastic unit 141.

[0021] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, when the first friction pad rod 133 rotates in an outward direction, the first elastic unit 141 can apply an elastic restoring force between the first friction pad rod 133 and the first sealing tool rod 132, so that the first friction pad rod 133 returns to its initial state.

[0022] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, when the second friction pad rod 134 is further moved by the driving member 130 after the second friction pad 122 contacts one surface of the sealing portion 11c, the second friction pad rod can be rotated in an outward direction by the second elastic unit 142.

[0023] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, when the second friction pad rod 134 rotates in an outward direction, the second elastic unit 142 can apply an elastic restoring force between the second friction pad rod 134 and the first sealing tool rod 132, so that the second friction pad rod 134 returns to its initial state.

[0024] In addition, in the sealing device of the secondary battery bag according to an embodiment of the present disclosure, the second sealing unit 200 may further include a guide portion 220 arranged on another surface of the sealing portion 11c, and the guide portion 220 is configured to contact the first friction pad 121 and the second friction pad 122 through the sealing portion 11c when the first friction pad 121 and the second friction pad 122 contact one surface of the sealing portion 11c.

[0025] In addition, the sealing apparatus of the secondary battery pouch according to the embodiment of the present disclosure may further include a seating portion 300 configured to enable the battery case 11 to be seated thereon.

[0026] In addition, a method for sealing a secondary battery bag using a sealing device for a secondary battery bag according to an embodiment of the present disclosure includes: (S1) placing a battery housing 11 between a first sealing unit 100 and a second sealing unit 200; (S2) using a driving member 130 to move the first sealing tool 110 and the friction pad portion 120 toward the sealing portion 11c; and (S3) using the first sealing tool 110 and the second sealing tool 210 to press and heat the sealing portion 11c to seal the sealing portion 11c.

[0027] In addition, the method for sealing a secondary battery bag according to an embodiment of the present disclosure may further include causing the first friction pad 121 and the second friction pad 122 to contact the sealing portion 11 c before step S3 to pull the sealing portion 11 c toward both sides.

[0028] Beneficial effects

[0029] It is obvious from the above description that in the sealing device of the secondary battery bag and the sealing method of the secondary battery bag using the sealing device of the secondary battery bag according to the present disclosure, the first friction pad and the second friction pad that can be in close contact with each other are respectively arranged at both ends of a surface of the sealing part, so that the sealing process is performed in a state where the two ends of the sealing part are tightened, thereby preventing wrinkles from occurring in the sealing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a diagram showing a conventional apparatus for sealing an air bag of a battery case.

[0031] Figure 2 It is a diagram showing a secondary battery having an air pocket.

[0032] Figure 3 is a perspective view illustrating a sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure.

[0033] Figure 4 is a cross-sectional view illustrating a sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure.

[0034] Figure 5 is a plan view illustrating a state before a first sealing tool of the sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure comes into contact with a sealing portion.

[0035] Figure 6 is a top view illustrating a state in which a first sealing tool of the sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure is in contact with a sealing portion.

[0036] Figure 7 is a conceptual diagram illustrating contact between a first sealing tool and a friction pad of a sealing apparatus for a secondary battery and a secondary battery pouch according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Now, the preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present disclosure. However, when describing the operating principles of the preferred embodiments of the present disclosure in detail, detailed descriptions of known functions and configurations incorporated herein will be omitted when they may obscure the subject matter of the present disclosure.

[0038] In addition, in all drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, when a component is said to be connected to another component, a component may not only be directly connected to another component, but also be indirectly connected to another component via yet another component. In addition, unless otherwise specified, the inclusion of a particular element does not mean the exclusion of other elements, but rather means that such elements may be further included.

[0039] Hereinafter, a sealing apparatus for a secondary battery pouch according to the present disclosure will be described. The sealing apparatus for a secondary battery pouch according to the present disclosure is a sealing apparatus for a secondary battery pouch for sealing a sealing portion 11 c of a second pouch 11 b for trapping gas.

[0040] Figure 2 It is a diagram showing a secondary battery having an air pocket.

[0041] Reference Figure 2 The secondary battery 10 according to the present disclosure includes a battery case 11 composed of a first bag 11a configured to accommodate an electrode assembly (not shown) with a pair of electrode leads facing each other, a second bag 11b for gas capture, and a heat-welded sealing portion 11c.

[0042] Here, each of the first pouch 11 a and the second pouch 11 b of the battery case 11 is made of a laminated sheet including an outer cover layer, a metal layer, and an inner cover layer.

[0043] The inner cover layer is in direct contact with the electrode assembly, so it must exhibit high insulation performance and high electrolyte resistance. In addition, the inner cover layer must exhibit high sealing properties to hermetically isolate the battery case from the outside. In other words, the thermal bond seal between the inner layers must exhibit excellent thermal bonding strength.

[0044] The inner cover layer may be made of a polyolefin-based resin (e.g., polypropylene, polyethylene, polyethylene acrylic acid, or polybutylene), a polyurethane resin, and a polyimide resin selected from materials exhibiting excellent chemical resistance and high sealing properties; however, the present disclosure is not limited thereto, and polypropylene exhibiting excellent mechanical properties (e.g., tensile strength, stiffness, surface hardness, and impact resistance) and excellent chemical resistance is most preferably used.

[0045] The metal layer adjacent to the inner cover layer corresponds to a barrier layer configured to prevent moisture or various gases from penetrating into the battery from the outside. A light-weight and easily formable aluminum thin film can be used as a preferred material for the metal layer.

[0046] An outer covering layer is provided on the other surface of the metal layer, and the outer covering layer may be made of a heat-resistant polymer exhibiting excellent tensile strength, moisture permeation resistance, and air permeation resistance, so that the outer covering layer exhibits high heat resistance and chemical resistance while protecting the electrode assembly. As an example, the outer covering layer may be made of nylon or polyethylene terephthalate; however, the present disclosure is not limited thereto.

[0047] The electrode assembly contained in the first bag 11a may be a wound-type electrode assembly, configured to have a structure in which a long sheet-type negative electrode and a long sheet-type positive electrode are wound with a separator interposed therebetween; a stacked-type electrode assembly, including unit battery cells, each unit battery cell being configured to have a structure in which a rectangular positive electrode and a rectangular negative electrode are stacked with a separator interposed therebetween; a stacked-folding-type electrode assembly, configured to have a structure in which unit battery cells are wound using a long separator; or a laminated-stacked-type electrode assembly, configured to have a structure in which unit battery cells are stacked with a separator interposed therebetween and then attached to each other; however, the present disclosure is not limited thereto.

[0048] The positive electrode includes a positive electrode current collector and a positive electrode active material coated on each of the upper and lower surfaces of the positive electrode current collector. The positive electrode active material may be mixed with a conductive agent and a binder, and a filler may be further added if necessary.

[0049] The negative electrode includes a negative electrode current collector and a negative electrode active material coated on each of the upper and lower surfaces of the negative electrode current collector. The negative electrode active material may be further mixed with a conductive agent and a binder, and the negative electrode current collector may be coated with the mixture.

[0050] The separator prevents short circuits between the negative electrode and the positive electrode and allows only the migration of lithium ions. Preferably, the separator is made of any one selected from polyethylene, polypropylene, a double layer of polyethylene / polypropylene, a triple layer of polyethylene / polypropylene / polyethylene, a triple layer of polypropylene / polyethylene / polypropylene, and an organic fiber filter paper; however, the present disclosure is not limited thereto.

[0051] Figure 3 is a perspective view showing a sealing device for a secondary battery pouch according to an embodiment of the present disclosure, and Figure 4 : is a cross-sectional view showing a sealing device for a secondary battery bag according to an embodiment of the present disclosure. Figure 5 is a top view showing a state before a first sealing tool of a sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure comes into contact with a sealing portion, Figure 6 is a top view showing a state in which a first sealing tool of a sealing apparatus for a secondary battery pouch according to an embodiment of the present disclosure is in contact with a sealing portion, and Figure 7 is a conceptual diagram illustrating contact between a first sealing tool and a friction pad of a sealing apparatus for a secondary battery and a secondary battery pouch according to an embodiment of the present disclosure.

[0052] The sealing apparatus for sealing a secondary battery pouch having the sealing portion 11 c of the battery case 11 configured as described above according to the present disclosure may include a first sealing unit 100 , a second sealing unit 200 , and a seating portion 300 .

[0053] First, the first sealing unit 100 may include a first sealing tool 110, a friction pad portion 120, a driving member 130, and an elastic portion 140. For example, the first sealing unit 100 may be disposed at one side of the sealing portion 11c.

[0054] The first sealing tool 110 may be provided on one side of the sealing portion 11c (at Figure 4 ) to press and heat the sealing portion 11 c of the secondary battery 10 so that the sealing portion is sealed.

[0055] Here, the length of the first sealing tool 110 is preferably equal to or greater than the length of the sealing portion 11 c so as to be in close contact with the entire sealing portion 11 c in the width direction.

[0056] The friction pad portion 120 may include a first friction pad 121 and a second friction pad 122 provided at both ends of one surface of the sealing portion 11 c .

[0057] The first friction pad 121 may be provided on one side of a surface of the sealing portion 11c. For example, the first friction pad 121 may be provided on Figure 3In addition, the second friction pad 122 can be arranged on the other side of one surface of the sealing portion 11c. For example, the second friction pad 122 can be set at the position of the 8 o'clock direction.

[0058] Here, each of the first friction pad 121 and the second friction pad 122 is preferably made of a material having excellent friction, more preferably made of a material having friction and a certain degree of elasticity, and most preferably made of a material having friction, elasticity, and heat resistance. As an example, each of the first friction pad 121 and the second friction pad 122 may include a silicone material; however, the present disclosure is not particularly limited as long as each pad is made of a material having the above-mentioned characteristics.

[0059] In addition, the material having the above-described characteristics may be coated only on a portion of each of the first friction pad 121 and the second friction pad 122 that contacts the sealing portion 11 c .

[0060] The driving member 130 can move the first sealing tool 110 and the friction pad portion 120 to one side or the other. For example, the driving member 130 can provide a forward motion to move the first sealing tool 110 to the other side where the sealing portion 11c is located ( Figure 4 9 o'clock position in the middle), and provide a backward movement to move the first sealing tool 110 to a side away from the sealing portion 11c ( Figure 4 3 o'clock position in the figure).

[0061] Specifically, the driving member 130 includes a cylinder 131 , a first sealing tool rod 132 , a first friction pad rod 133 , and a second friction pad rod 134 .

[0062] First, the cylinder 131 may provide a driving force to move the first sealing tool rod 132 , the first friction pad rod 133 , and the second friction pad rod 134 to one side or the other.

[0063] One side of the first sealing tool rod 132 may be connected to the cylinder 131 and the other side to the first sealing tool 110 to provide a driving force to the first sealing tool 110 so that the first sealing tool can move to one side or the other.

[0064] For example, the first sealing tool rod 132 may be connected to the rear surface of the first sealing tool 110 to provide a driving force to move the first sealing tool 110 forward or backward, whereby the first sealing tool 110 may press the sealing portion 11 c .

[0065] Here, that the first sealing tool rod 132 provides the driving force to the first sealing tool 110 may mean that the first sealing tool rod 132 provides the driving force received by the cylinder 131 to the first sealing tool 110 .

[0066] Additionally, for example, the first sealing tool rod 132 may include one or more rods to support the first sealing tool 110 .

[0067] One side of the first friction pad rod 133 may be connected to the first sealing tool rod 132 and the other side thereof may be connected to the first friction pad 121 .

[0068] For example, the first friction pad rod 133 may be connected to the first sealing tool rod 132 to provide the driving force provided by the cylinder 131 to the first friction pad 121 so that the first friction pad can move to one side or the other.

[0069] Here, that the first friction pad rod 133 provides the driving force to the first friction pad 121 may mean that the first friction pad rod 133 is connected to the first sealing tool rod 132 to provide the driving force received by the cylinder 131 to the first friction pad 121 .

[0070] Therefore, the first friction pad lever 133 may provide a driving force to the first friction pad 121 so that the first friction pad 121 comes into contact with one surface of the sealing portion 11 c .

[0071] The first friction pad rod 133 may be provided with an axis partially extending to the lower side of the first sealing tool rod 132, and may be provided in an "L" shape extending from the extended axis to the other side, that is, extending downward and then extending laterally. Therefore, the first friction pad 121 may be lower than the first sealing tool 110.

[0072] In addition, the first friction pad rod 133 may extend further to the other side than the first sealing tool rod 132, so that the first friction pad 121 contacts the sealing portion 11c before the first sealing tool 110. Therefore, the first friction pad 121 may be closer to the sealing portion 11c than the first sealing tool 110.

[0073] Additionally, for example, the first friction pad rod 133 may be rotated in an outward direction relative to the first sealing tool rod 132. For example, the outward rotation of the first friction pad rod 133 may be toward the outer edge of the sealing portion 11c rather than toward the center of the sealing portion. Figure 3 , for example, the outward rotation of the first friction pad rod 133 may be a rotation in a clockwise direction.

[0074] Therefore, after contacting one surface of the sealing portion 11 c , a force pulling the sealing portion 11 c to one side may be applied to the first friction pad 121 by rotating the first friction pad lever 133 outward.

[0075] Meanwhile, the second friction pad rod 134 may be connected to the first sealing tool rod 132 on one side and connected to the second friction pad 122 on the other side.

[0076] For example, the second friction pad rod 134 may be connected to the first sealing tool rod 132 to provide the driving force provided by the cylinder 131 to the second friction pad 122 so that the second friction pad can move to one side or the other.

[0077] Here, that the second friction pad rod 134 provides the driving force to the second friction pad 122 may mean that the second friction pad rod 134 is connected to the first sealing tool rod 132 to provide the driving force received by the cylinder 131 to the second friction pad 122 .

[0078] Therefore, the second friction pad lever 134 may provide a driving force to the second friction pad 122 so that the second friction pad 122 comes into contact with one surface of the sealing portion 11 c .

[0079] The second friction pad rod 134 may be provided with an axis partially extending to the lower side of the first sealing tool rod 132, and may be provided in an "L" shape extending from the extended axis to the other side, that is, extending downward and then extending laterally. Therefore, the second friction pad 122 may be lower than the first sealing tool 110.

[0080] In addition, the second friction pad rod 134 can extend further to the other side than the first sealing tool rod 132, so that the second friction pad 122 contacts the sealing portion 11c before the first sealing tool 110. Therefore, the second friction pad 122 can be closer to the sealing portion 11c than the first sealing tool 110.

[0081] Additionally, for example, the second friction pad rod 134 may be rotated in an outward direction relative to the first sealing tool rod 132. For example, the outward rotation of the second friction pad rod 134 may be toward the outer edge of the sealing portion 11c rather than toward the center of the sealing portion. Figure 3 , for example, the outward rotation of the second friction pad rod 134 may be in a counterclockwise direction.

[0082] Therefore, after contacting one surface of the sealing portion 11 c , a force pulling the sealing portion 11 c to one side may be applied to the second friction pad 122 by rotating the second friction pad lever 134 .

[0083] Next, the elastic portion 140 may include a first elastic unit 141 and a second elastic unit 142 .

[0084] The first elastic unit 141 may be interposed between the first sealing tool rod 132 and the first friction pad rod 133 to provide a rotational elastic force to the first friction pad rod 133 .

[0085] For example, the first elastic unit 141 may be provided on the shaft of the first friction pad lever 133 to provide a rotational elastic force to the first friction pad lever 133 .

[0086] Here, the first elastic unit 141 may be configured as a torsion spring; however, the present disclosure is not limited thereto.

[0087] When the first elastic unit 141 is further moved by the driving member 130 after the first friction pad 121 contacts one surface of the sealing portion 11 c , the first friction pad lever 133 may be rotated in an outward direction.

[0088] Here, after the first friction pad 121 comes into contact with one surface of the sealing portion 11 c , further movement may be provided by the driving member 130 to bring the first sealing tool 110 into contact with the one surface of the sealing portion 11 c .

[0089] In addition, when the first friction pad rod 133 rotates in an outward direction, the first elastic unit 141 may apply an elastic restoring force between the first friction pad rod 133 and the first sealing tool rod 132 so that the first friction pad rod 133 returns to its original state.

[0090] For example, the initial state of the first friction pad lever 133 may be a state of the first friction pad lever 133 when the first friction pad 121 is not in contact with one surface of the sealing portion 11 c .

[0091] In addition, the second elastic unit 142 may be interposed between the first sealing tool rod 132 and the second friction pad rod 134 to provide a rotational elastic force to the second friction pad rod 134 .

[0092] For example, the second elastic unit 142 may be provided on the shaft of the second friction pad rod 134 to provide a rotational elastic force to the second friction pad rod 134 .

[0093] Here, the second elastic unit 142 may be configured as a torsion spring as in the first elastic unit 141 ; however, the present disclosure is not limited thereto.

[0094] When the second elastic unit 142 is further moved by the driving member 130 after the second friction pad 122 contacts one surface of the sealing portion 11 c , the second friction pad lever 134 may be rotated outward.

[0095] Here, after the second friction pad 122 comes into contact with one surface of the sealing portion 11 c , further movement may be provided by the driving member 130 to bring the first sealing tool 110 into contact with the one surface of the sealing portion 11 c .

[0096] In addition, when the second friction pad rod 134 rotates in the outward direction, the second elastic unit 142 may apply an elastic restoring force between the second friction pad rod 134 and the first sealing tool rod 132 so that the second friction pad rod 134 returns to its original state.

[0097] For example, the initial state of the second friction pad lever 134 may be a state of the second friction pad lever 134 when the second friction pad 122 is not in contact with one surface of the sealing portion 11 c .

[0098] The second sealing unit 200 may include a second sealing tool 210 and a guide portion 220. The second sealing unit 200 may be disposed at the other side of the sealing portion 11c.

[0099] The second sealing tool 210 may be provided on the other side of the sealing portion 11c (at Figure 4 9 o'clock direction in the middle) to press and heat the sealing portion 11c so that the sealing portion is sealed.

[0100] That is, the first sealing tool 110 and the second sealing tool 210 may contact each other across the sealing portion 11 c to press and heat the sealing portion 11 c so that the sealing portion is sealed.

[0101] Here, the length of the second sealing tool 210 is preferably equal to or greater than the length of the sealing portion 11 c so as to be in close contact with the entire sealing portion 11 c in the width direction.

[0102] Meanwhile, the first sealing tool 110 and the second sealing tool 210 of the sealing apparatus according to the present disclosure are obvious to those skilled in the art, and thus a more detailed description thereof will be omitted.

[0103] The guide portion 220 is provided on the other surface of the sealing portion 11c and can be configured so that when the first friction pad 121 and the second friction pad 122 are in contact with one surface of the sealing portion 11c, the guide portion 220 contacts the first friction pad 121 and the second friction pad 122 across the sealing portion 11c. In other words, the guide portion 220 can be provided to correspond to the first friction pad 121 and the second friction pad 122.

[0104] For example, the guide portion 220 may be provided on the other surface of the sealing portion 11 c so that the first and second friction pads 121 and 122 no longer move forward when they contact one surface of the sealing portion 11 c .

[0105] Next, the seating portion 300 may be configured to enable the battery case 11 to be seated thereon.

[0106] For example, the seating portion 300 may be shaped to have a depression at the center thereof so that the sealing portion 11 c of the battery case 11 is seated and fixed in an upright position and facing upward.

[0107] Of course, it is apparent that when the sealing portion 11 c is sealed by the first sealing unit 100 and the second sealing unit 200 , the seating portion 300 performs a function of preventing the secondary battery 10 from moving.

[0108] In addition, for example, the seating portion 300 may include a seating portion driving unit (not shown) configured to move the secondary battery 10 upward and downward so that the sealing portion 11 c of the secondary battery 10 is located between the first sealing unit 100 and the second sealing unit 200 .

[0109] In the following, reference will be made to Figures 3 to 7 A method of sealing a secondary battery pouch using the sealing apparatus of the secondary battery pouch according to an embodiment of the present disclosure is described.

[0110] The sealing method of a secondary battery bag according to the present disclosure includes: (S1) positioning a battery housing 11 between a first sealing unit 100 and a second sealing unit 200; (S2) using a driving member 130 to move a first sealing tool 110 and a friction pad portion 120 toward a sealing portion 11c; and (S3) using the first sealing tool 110 and the second sealing tool 210 to press and heat the sealing portion 11c to seal the sealing portion 11c.

[0111] For example, in step S1 , the secondary battery 10 may be seated on the seating portion 300 , and the sealing portion 11 c may be interposed between the first sealing unit 100 and the second sealing unit 200 using a seating portion driving unit (not shown).

[0112] In step S2 , the first friction pad 121 and the second friction pad 122 may contact the sealing portion 11 c before the first sealing tool 110 to pull the sealing portion 11 c toward both sides.

[0113] Will refer to Figure 5 8 are described in more detail. In step S2, the first sealing tool rod 132, the first friction pad rod 133 and the second friction pad rod 134 are moved to the other side by the cylinder 131, whereby the first sealing tool 110 and the friction pad portion 120 can be moved toward the sealing portion 11c.

[0114] At this time, the first friction pad 121 and the second friction pad 122 may be closer to the sealing portion 11 c than the first sealing tool 110 , and thus the first friction pad 121 and the second friction pad may contact the sealing portion 11 c before the first sealing tool 110 .

[0115] After the first friction pad 121 and the second friction pad 122 contact one surface of the sealing portion 11c, the first friction pad rod 133 and the second friction pad rod 134 can be further moved by the cylinder 131, whereby the first friction pad rod and the second friction pad rod can be rotated in an outward direction by the first elastic unit 141 and the second elastic unit 142, respectively.

[0116] Here, after the first and second friction pads 121 and 122 come into contact with one surface of the sealing portion 11 c , further movement may be provided by the cylinder 131 to bring the first sealing tool 110 into contact with the one surface of the sealing portion 11 c .

[0117] When the first friction pad 121 and the second friction pad 122 contact one surface of the sealing portion 11c and contact the guide portion 220 located on the other surface of the sealing portion 11c, the first friction pad rod 133 and the second friction pad rod 134 can no longer move forward and can be rotated in an outward direction by the first elastic unit 141 and the second elastic unit 142, respectively.

[0118] Therefore, before the sealing part 11c is heat-welded by the first sealing tool 110 and the second sealing tool 210, the first friction pad 121 and the second friction pad 122 can contact the sealing part 11c before the first sealing tool 110, thereby pressing the sealing part 11c first and pulling the sealing part 11c to both sides to remove wrinkles from the sealing part 11c.

[0119] In step S3 , the first sealing tool 110 and the second sealing tool 210 may be brought into contact with each other via the sealing portion 11 c , and the sealing portion 11 c may be heated and pressed to a specific temperature so that the sealing portion 11 c is heat-welded.

[0120] In addition, after step S3 , the first elastic unit 141 may apply an elastic restoring force between the first friction pad rod 133 and the first sealing tool rod 132 , so that the first friction pad rod 133 returns to its original state.

[0121] Similarly, the second elastic unit 142 may apply an elastic restoring force between the second friction pad rod 134 and the first sealing tool rod 132 , so that the second friction pad rod 134 returns to its original state.

[0122] Although the specific details of the present disclosure have been described in detail, it will be understood by those skilled in the art that the detailed description thereof only discloses the preferred embodiments of the present disclosure and therefore does not limit the scope of the present disclosure. Therefore, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the category and technical concept of the present disclosure, and it is obvious that such changes and modifications fall within the scope of the appended claims.

[0123] (Explanation of Reference Numerals)

[0124] 10: Secondary batteries

[0125] 11: Battery housing

[0126] 11a: First bag 11b: Second bag

[0127] 11c: Sealing part

[0128] 100: First sealing unit

[0129] 110: First Sealing Tool

[0130] 120: Friction pad

[0131] 121: First friction pad 122: Second friction pad

[0132] 130: Driving component

[0133] 131: Cylinder 132: First sealing tool rod

[0134] 133: First friction pad 134: Second friction pad

[0135] 140: Elastic part

[0136] 141: First elastic unit 142: Second elastic unit

[0137] 200: Second sealing unit

[0138] 210: Second sealing tool 220: Guide portion

[0139] 300: Resettlement Department

Claims

1. A sealing device for a secondary battery bag, for sealing a sealing portion of a second bag for capturing gas, the sealing device comprising: a first sealing unit comprising: a first sealing tool disposed at one side of the sealing portion to seal the sealing portion by pressing and heating the sealing portion; a friction pad portion connected to the first sealing tool, the friction pad portion comprising a first friction pad and a second friction pad disposed at both ends of one surface of the sealing portion; and a driving member configured to move the first sealing tool and the friction pad portion to one side or the other; and The second sealing unit includes a second sealing tool provided at the other side of the sealing portion to seal the sealing portion by pressing and heating the sealing portion.

2. The sealing device for a secondary battery bag according to claim 1, wherein: The first friction pad is provided on one side of one surface of the sealing portion, and after coming into contact with the one surface of the sealing portion, a force is applied to the first friction pad to pull the sealing portion to one side, and The second friction pad is provided on the other side of one surface of the sealing portion, and after coming into contact with the one surface of the sealing portion, a force that pulls the sealing portion toward the other side is applied to the second friction pad.

3. The sealing device for a secondary battery bag according to claim 1, wherein: The first friction pad and the second friction pad are closer to the sealing portion than the first sealing tool to contact the sealing portion before the first sealing tool.

4. The sealing device for a secondary battery bag according to claim 1, wherein: The driving member comprises: cylinder; a first sealing tool rod connected to the cylinder on one side and to the first sealing tool on the other side, the first sealing tool rod being configured to provide a driving force to the first sealing tool so that the first sealing tool can be moved to one side or the other; a first friction pad rod connected to the first sealing tool rod on one side and connected to the first friction pad on the other side; and A second friction pad rod has one side connected to the first sealing tool rod and the other side connected to the second friction pad.

5. The sealing device for a secondary battery pouch according to claim 4, comprising an elastic portion, the elastic portion comprising: a first elastic unit, interposed between the first sealing tool rod and the first friction pad rod, the first elastic unit being configured to provide a rotational elastic force to the first friction pad rod; as well as The second elastic unit is interposed between the first sealing tool rod and the second friction pad rod, and the second elastic unit is configured to provide a rotational elastic force to the second friction pad rod.

6. The sealing device for a secondary battery bag according to claim 5, wherein: When the first friction pad lever is further moved by the driving member after the first friction pad comes into contact with one surface of the sealing portion, the first friction pad lever is rotated in an outward direction by the first elastic unit.

7. The sealing device for a secondary battery bag according to claim 6, wherein: When the first friction pad rod rotates in an outward direction, the first elastic unit applies an elastic restoring force between the first friction pad rod and the first sealing tool rod, so that the first friction pad rod returns to its original state.

8. The sealing device for a secondary battery pouch according to claim 5, wherein: When the second friction pad lever is further moved by the driving member after the second friction pad comes into contact with one surface of the sealing portion, the second friction pad lever is rotated in an outward direction by the second elastic unit.

9. The sealing device for a secondary battery bag according to claim 8, wherein: When the second friction pad rod rotates in an outward direction, the second elastic unit applies an elastic restoring force between the second friction pad rod and the first sealing tool rod, so that the second friction pad rod returns to its original state.

10. The sealing device for a secondary battery pouch according to claim 1, wherein The second sealing unit further includes a guide portion provided on the other surface of the sealing portion, the guide portion being configured to contact the first and second friction pads via the sealing portion when the first and second friction pads are in contact with one surface of the sealing portion. 11 . The sealing apparatus of a secondary battery pouch according to claim 1 , further comprising a seating portion configured to enable the battery case to be seated thereon.

12. A method for sealing a secondary battery bag, the method using the secondary battery bag sealing device according to any one of claims 1 to 11, the method comprising: (S1) placing a battery housing between the first sealing unit and the second sealing unit; (S2) using the driving member to move the first sealing tool and the friction pad portion (120) toward the sealing portion; as well as (S3) The sealing portion is pressed and heated using the first sealing tool and the second sealing tool to seal the sealing portion. 13 . The method for sealing a secondary battery bag according to claim 12 , further comprising, before step ( S3 ), making the first friction pad and the second friction pad contact the sealing portion first, thereby pulling the sealing portion toward both sides.

Images