Pressing device for pouch-type secondary battery, and pressing method using same

Abstract

The present invention relates to: a pressing device for a pouch-type secondary battery that comprises a first pocket part accommodating an electrode assembly in which a pair of electrode leads are positioned at opposite sides, and a first sealing part which is at the edge of the first pocket part; and a pressing method using same. The pressing device for a pouch-type secondary battery comprises a first pressing part for pressing one surface of the first pocket part and a second pressing part for pressing the other surface of the first pocket part, wherein the first pressing part has a first pressing pad having a plurality of first embossings formed toward one surface of the first pocket part, and the second pressing part has a second pressing pad having a plurality of second embossings formed toward the other surface of the first pocket part.

Description

Pressurizing device for pouch-type secondary battery and pressurizing method using the same

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0084885, filed June 27, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a pressurizing device for a pouch-type secondary battery and a pressurizing method using the same, and more specifically, to a pressurizing device for a pouch-type secondary battery capable of uniformly pressurizing the entire pouch-type secondary battery case to remove gas inside the case, and a pressurizing method using the same.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] A typical pouch-type secondary battery manufacturing process includes inserting an electrode assembly into a battery case accommodating space made of a laminate sheet, injecting an electrolyte inside the battery case, sealing it, and performing an activation process.

[0007] However, when injecting the electrolyte, there are cases where the injected electrolyte is not sufficiently impregnated into the electrode assembly due to gas inside the case or bubbles generated during the injection process. This causes the generation of uncharged and undischarged portions even after the activation process, which causes a decrease in battery capacity.

[0008] Of course, during the activation process, a large amount of gas is generated due to chemical reactions and side reactions between the electrolyte and electrode.

[0009] Fig. 1 is a conceptual diagram showing a part of a secondary battery pressurization device according to the prior art, Fig. 2 is a plan view for explaining a pouch-type secondary battery, and Fig. 3 is a side view for explaining a pouch-type secondary battery.

[0010] As shown in FIGS. 1 to 3, when the degassing roller press process of the pouch-type secondary battery (10) is performed, the pressure roller (20) applies rolling pressure to the first pocket portion (11), thereby removing the gas located inside the first pocket portion (11) while moving it to the second pocket portion (12).

[0011] However, the device is complicated because the pressure roller (20) must be located on both sides of the first pocket portion (11) and the pressure roller (20) must be driven vertically and horizontally with respect to the first pocket portion (11).

[0012]

[0013] (Prior art literature)

[0014] (Patent Document 1) Korean Patent Publication No. 10-2018-0025805

[0015]

[0016] In order to solve the above problems, the present invention aims to provide a pouch-type secondary battery pressurizing device having a simple structure and a pressurizing method using the same while easily removing gas generated during an electrolyte injection process or an activation process.

[0017]

[0018] As a technical means for achieving the above purpose, a pressurizing device of a pouch-type secondary battery according to one embodiment of the present invention is a pressurizing device of a pouch-type secondary battery (10) including a first pocket portion (11) for accommodating an electrode assembly in which a pair of electrode leads (13) are positioned facing each other, and a first sealing portion (S1) at an edge of the first pocket portion (11), comprising: a first pressurizing portion (100) for pressing one surface of the first pocket portion (11); And a second pressurizing portion (200) for pressing the other surface of the first pocket portion (11), wherein the first pressurizing portion (100) is provided to have a first pressurizing pad (110) having a plurality of first embossings (111) formed toward one surface of the first pocket portion (11), and the second pressurizing portion (200) is provided to have a second pressurizing pad (210) having a plurality of second embossings (211) formed toward the other surface of the first pocket portion (11).

[0019] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, when the pouch-type secondary battery (10) is positioned in a vertical direction, the first embossing (111) and the second embossing (211) are characterized in that they get closer to the first pocket portion (11) as they go downward.

[0020] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first embossing (111) and the second embossing (211) are characterized in that the protrusion height increases as they go downward.

[0021] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first pressurizing pad (110) and the second pressurizing pad (210) are characterized in that they are provided as elastic members.

[0022] In addition, in a pressurizing device of a pouch-type secondary battery according to one embodiment of the present invention, the elastic member is characterized in that it includes a silicone material.

[0023] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first embossing (111) and the second embossing (211) are characterized in that they temporarily become flat when they come into contact with the first pocket portion (11).

[0024] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first pressurizing pad (110) includes a first raised portion (112) that presses the rounded sliding portion (11b) on one surface of the first pocket portion (11), and the second pressurizing pad (210) includes a second raised portion (212) that presses the rounded sliding portion (11b) on the other surface of the first pocket portion (11).

[0025] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first raised portion (112) and the second raised portion (212) are characterized in that they are provided in a shape corresponding to the round shape of the sliding portion (11b).

[0026] In addition, in the pressurizing device of the pouch-type secondary battery according to one embodiment of the present invention, the first pressurizing unit (100) includes a first pressurizing plate (120) provided on one surface of the first pressurizing pad (110) to support the first pressurizing pad (110), and the second pressurizing unit (200) includes a second pressurizing plate (220) provided on the other surface of the second pressurizing pad (210) to support the second pressurizing pad (210).

[0027] In addition, in a pressurizing device of a pouch-type secondary battery according to one embodiment of the present invention, a driving unit (300) including a first driving member (310) and a second driving member (320) is further included so as to drive the first pressing unit (100) and the second pressing unit (200), wherein the first driving member (310) is connected to one surface of the first pressing plate (120) to move the first pressing pad (110) toward one surface of the first pocket portion (11), and the second driving member (320) is connected to the other surface of the second pressing plate (220) to move the second pressing pad (210) toward the other surface of the first pocket portion (11).

[0028] In addition, a method for pressing a pouch-type secondary battery using a pressurizing device according to one embodiment of the present invention is characterized by including: (S1) a step of positioning the pouch-type secondary battery (10) between the first pressurizing portion (100) and the second pressurizing portion (200); (S2) a step of operating the first driving member (310) and the second driving member (320) to move the first pressurizing portion (100) and the second pressurizing portion (200) to one side and the other side of the pouch-type secondary battery (10), respectively; and (S3) a step of pressing the first pressurizing pad (110) and the second pressurizing pad (210) to press the first pocket portion (11).

[0029] In addition, the method for pressurizing a pouch-type secondary battery according to one embodiment of the present invention is characterized in that, in the step (S3), the lower side of the first pocket portion (11) first comes into contact with the first pressurizing pad (110) and the second pressurizing pad (210).

[0030] In addition, the method for pressing a pouch-type secondary battery according to one embodiment of the present invention is characterized in that, in the step (S3), the first pressing pad (110) and the second pressing pad (210) come into contact with one side of the first pocket portion (11) and the sliding portion (11b) of the other side.

[0031]

[0032] As described above, according to the pressurizing device of the pouch-type secondary battery according to the present invention and the pressurizing method using the same, the driving unit of the pressurizing unit that pressurizes one side and the other side of the first pocket portion for storing the electrode assembly can pressurize the first pocket portion only by horizontal or vertical reciprocating motion, so there is an advantage in that the structure of the device is simple.

[0033] In addition, according to the pressurizing device of the pouch-type secondary battery according to the present invention and the pressurizing method using the same, the pressurizing part that pressurizes one side and the other side of the first pocket part that accommodates the electrode assembly is provided with a pressurizing pad having an embossed shape, so that there is an advantage in that gas inside the first pocket part can be effectively removed.

[0034] In addition, according to the pressurizing device of the pouch-type secondary battery according to the present invention and the pressurizing method using the same, the embossing of the pressurizing pad is formed so that the protrusion height increases toward the bottom and decreases toward the top, so that not only is gas discharge easy, but the electrolyte impregnation performance of the electrode assembly can also be improved, which has the advantage of being able to do so.

[0035] In addition, according to the pressurizing device of the pouch-type secondary battery according to the present invention and the pressurizing method using the same, since the pressurizing pad includes a raised portion that presses the round sliding portion of the first pocket portion, there is an advantage in that even gas inside the sliding portion can be removed.

[0036]

[0037] Figure 1 is a conceptual diagram showing a part of a secondary battery pressurization device according to the prior art.

[0038] Figure 2 is a plan view for explaining a pouch-type secondary battery.

[0039] Figure 3 is a side view illustrating a pouch-type secondary battery.

[0040] FIG. 4 is a front view of a pressurizing device according to a first embodiment of the present invention positioned on one side and the other side of a first pocket portion of a pouch-type secondary battery.

[0041] Figure 5 is a perspective view of a first pressurizing portion of a pressurizing device according to a first embodiment of the present invention.

[0042] FIG. 6 is a front view of a pressurizing device according to a first embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0043] FIG. 7 is a front view illustrating a modified example of the first embodiment of the present invention in which the first pressure pad is stored in the storage portion of the first pressure plate.

[0044] Figure 8 is a front view of a pressurizing device according to a second embodiment of the present invention, positioned on one side and the other side of the first pocket portion of a pouch-type secondary battery.

[0045] Fig. 9 is a perspective view of a first pressurizing portion of a pressurizing device according to a second embodiment of the present invention.

[0046] FIG. 10 is a front view of a pressurizing device according to a second embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0047] FIG. 11 is a drawing of a pressurizing device according to a third embodiment of the present invention, viewed from above, positioned on one side and the other side of the first pocket portion of a pouch-type secondary battery.

[0048] Fig. 12 is a perspective view of a first pressurizing portion of a pressurizing device according to a third embodiment of the present invention.

[0049] FIG. 13 is a drawing showing a pressurizing device according to a third embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0050] Figure 14 is a flowchart for explaining a method of pressurizing a pouch-type secondary battery using a pressurizing device according to the present invention.

[0051]

[0052] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0053] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0054]

[0055] Hereinafter, a pressurizing device for a pouch-type secondary battery according to the present invention and a pressurizing method using the same will be described.

[0056] First, referring to FIGS. 2 and 3, the pouch-type secondary battery (10) is composed of a first pocket portion (11) for storing an electrode assembly (not shown) in which a pair of electrode leads (13) are positioned facing each other, a first sealing portion (S1) at the edge of the first pocket portion (11), a second pocket portion (12) for gas collection, and a second sealing portion (S2) at the edge of the second pocket portion (12).

[0057] The first sealing portion (S1) can be formed by sealing the edges on both sides (3 o'clock to 9 o'clock direction based on Fig. 2) of the first pocket portion (11) where a pair of electrode leads (13) are positioned, and the second sealing portion (S2) can be formed by sealing the edges on the upper side (12 o'clock direction based on Fig. 2) of the second pocket portion (12) where a pair of electrode leads (13) do not protrude.

[0058] A pair of electrode leads (13) may be provided as a positive electrode lead and a negative electrode lead.

[0059] Meanwhile, the pouch-type secondary battery forms a first pocket portion (11) and a second pocket portion (12) using a laminate sheet composed of an outer covering layer, a metal layer, and an inner covering layer.

[0060] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0061] Materials for the inner covering layer may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0062] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0063] And the other side of the metal layer is provided with an outer covering layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance, and examples thereof include, but are not limited to, nylon or polyethylene terephthalate.

[0064] Meanwhile, the electrode assembly accommodated in the first pocket portion (11) may be formed of a jelly-roll type electrode assembly having a structure in which a separator is interposed between a long sheet-shaped cathode and anode and then rolled up, a stack type electrode assembly having unit cells having a structure in which rectangular cathodes and anodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separating film, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other, but is not limited thereto.

[0065] The positive electrode is composed of a positive electrode current collector and a positive electrode active material applied to the upper and lower surfaces of the positive electrode current collector. A conductive material and a binder may be mixed with the positive electrode active material, and a filler may be further added as needed.

[0066] The negative electrode is composed of a negative electrode current collector and a negative electrode active material applied to the lower and upper surfaces of the negative electrode current collector. A conductive material and a binder may be additionally mixed into the negative electrode active material and coated on the negative electrode current collector.

[0067] The separator prevents shorting between the aforementioned negative electrode and positive electrode and only allows the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0068] Meanwhile, when manufacturing an electrode that constitutes an electrode assembly, the electrode material is coated in a slurry state. At this time, due to the fluidity of the slurry, the central part of the electrode may be flat, but the edges of the electrode may be thin, thereby forming a so-called sliding region of the electrode.

[0069] Accordingly, the first pocket portion (11) in which the electrode assembly is stored may be provided with a flat portion (11a) corresponding to the central region of the electrode where the slurry is evenly coated, and a sliding portion (11b) corresponding to the sliding region of the electrode.

[0070]

[0071] FIG. 4 is a front view of a pressurizing device according to a first embodiment of the present invention positioned on one side and the other side of a first pocket portion of a pouch-type secondary battery, FIG. 5 is a perspective view of a first pressurizing device according to a first embodiment of the present invention, and FIG. 6 is a front view of a pressurizing device according to a first embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0072] A pressurizing device for a pouch-type secondary battery according to the first embodiment of the present invention for pressurizing a first pocket portion (11) of a pouch-type secondary battery (10) having the aforementioned configuration may be configured to include a first pressurizing portion (100), a second pressurizing portion (200), and a driving portion (300).

[0073] The first pressurizing unit (100) and the second pressurizing unit (200) may be provided so as to be in contact with each other with the first pocket unit (11) interposed therebetween, while the pouch-type secondary battery (10) is positioned vertically (12 o'clock to 6 o'clock direction as shown in FIG. 4). At this time, the first pressurizing unit (100) may be provided so as to press one side (9 o'clock direction as shown in FIG. 4) of the first pocket unit (11), and the second pressurizing unit (200) may be provided so as to press the other side (3 o'clock direction as shown in FIG. 4) of the first pocket unit (11).

[0074] First, the first pressurizing portion (100) may include a first pressurizing pad (110) and a first pressurizing plate (120). The first pressurizing pad (110) may be provided to contact one surface of the first pocket portion (11) and pressurize one surface of the first pocket portion (11).

[0075] The first pressure pad (110) may be provided with an elastic member. For example, the first pressure pad (110) may be provided with an elastic member so that when one surface of the first pocket portion (11) is pressed, the first pressure pad (110) can be compressed, and when the pressure is released, the shape can be restored by elastic restoring force. More specifically, the elastic member may be provided with a material that is heat-resistant and pressure-resistant and whose shape can be freely changed, and may include, for example, a silicone material.

[0076] The first pressure pad (110) may be formed with a plurality of first embossings (111) toward one side of the first pocket portion (11), more specifically, a shape in which the central portion protrudes convexly toward one side of the first pocket portion (11).

[0077] For example, the first embossing (111) may be formed in a circular shape when viewed from one side, but is not limited thereto and may be formed in various shapes.

[0078] In addition, as shown in FIG. 6, when the first pressure pad (110) comes into contact with one surface of the first pocket portion (11) and the first pocket portion (11) is pressed, the convexly protruding surface becomes flat, and the convex surface can temporarily become a flat shape.

[0079] The first pressure plate (120) may be provided to be arranged on one surface of the first pressure pad (110) to support the first pressure pad (110). For example, the first pressure plate (120) may be formed of a material having rigidity so as to support the first pressure pad (110) when it presses one surface of the first pocket portion (11).

[0080] The second pressurizing portion (200) may include a second pressurizing pad (210) and a second pressurizing plate (220). The second pressurizing pad (210) may be provided to contact the other surface of the first pocket portion (11) and pressurize the other surface of the first pocket portion (11).

[0081] The second pressure pad (210) may be provided with an elastic member. For example, the second pressure pad (210) may be provided with an elastic member so that when the other surface of the first pocket portion (11) is pressed, the second pressure pad (210) may be compressed, and when the pressure is released, the shape may be restored by elastic restoring force. More specifically, the elastic member may be provided with a material that is heat-resistant and pressure-resistant and whose shape can be freely changed, and may include, for example, a silicone material.

[0082] The second pressure pad (210) may be formed with a plurality of second embossings (211) facing the other surface of the first pocket portion (11), more specifically, a shape in which the central portion protrudes convexly toward the other surface of the first pocket portion (11).

[0083] For example, the second embossing (211) may be formed in a circular shape when viewed from the other side, but is not limited thereto and may be formed in various shapes.

[0084] In addition, as shown in FIG. 6, when the second pressure pad (210) comes into contact with the other surface of the first pocket portion (11) and then presses the first pocket portion (11), the convexly protruding side becomes flat, and the convex side can temporarily become a flat shape.

[0085] The second pressure plate (220) may be provided to be positioned on the other surface of the second pressure pad (210) to support the second pressure pad (210). For example, the second pressure plate (220) may be formed of a material having rigidity so as to support the second pressure pad (210) when it presses the other surface of the first pocket portion (11).

[0086] The driving unit (300) may be configured to include a first driving member (310) and a second driving member (320).

[0087] First, the first driving member (310) may be provided to drive the first pressurizing portion (100). More specifically, the first driving member (310) may be connected to one surface of the first pressurizing plate (120) to move the first pressurizing pad (110) so that it comes into contact with one surface of the first pocket portion (11).

[0088] For example, the first driving member (310) can provide a forward motion that moves the first pressing portion (100) to the other side (3 o'clock direction based on FIG. 4) so ​​that the first pressing portion (100) faces one side of the first pocket portion (11), and a backward motion that moves the first pressing portion (100) to one side (9 o'clock direction based on FIG. 4) so ​​that the first pressing portion (100) is spaced from one side of the first pocket portion (11).

[0089] This first driving member (310) provides a moving driving force to the first pressure plate (120), so that the first pressure plate (120) moves toward the first pocket portion (11) and at the same time, the first pressure pad (110) is also driven, and depending on the amount of forward driving provided by the first driving member (310), the pressing force applied by the first pressure pad (110) to one surface of the first pocket portion (11) can be provided.

[0090] At this time, the first press pad (110) can uniformly pressurize one surface of the first pocket portion (11) by the first embossing (111) formed on the first press pad (110).

[0091] A second driving member (320) may be provided to drive the second pressurizing portion (200). More specifically, the second driving member (320) may be connected to the other surface of the second pressurizing plate (220) to move the second pressurizing pad (210) so that it comes into contact with the other surface of the first pocket portion (11).

[0092] For example, the second driving member (320) can provide a forward motion to move the second pressing member (200) to one side (9 o'clock direction based on FIG. 4) so ​​that the second pressing member (200) presses the other side of the first pocket member (11), and a backward motion to move the second pressing member (200) to the other side (3 o'clock direction based on FIG. 4) so ​​that the second pressing member (200) is separated from the other side of the first pocket member (11).

[0093] This second driving member (320) provides a moving driving force to the second pressure plate (220), so that the second pressure plate (220) moves toward the first pocket portion (11) and at the same time, the second pressure pad (210) is also driven, and depending on the amount of forward driving provided by the second driving member (320), the pressing force applied by the second pressure pad (210) to the other surface of the first pocket portion (11) can be provided.

[0094] At this time, the second press pad (210) can uniformly press the other surface of the first pocket portion (11) by the second embossing (211) formed on the second press pad (210).

[0095] The first driving member (310) and the second driving member (320) are not particularly limited as long as the aforementioned movement is possible, but may be, for example, a cylinder.

[0096]

[0097] FIG. 7 is a front view illustrating a modified example of the first embodiment of the present invention in which the first pressure pad is stored in the storage portion of the first pressure plate.

[0098] Except for the configuration of the first pressure plate (120) and the second pressure plate (220), the rest is the same as the first embodiment described above.

[0099] The first pressure plate (120) may be provided with a receiving portion formed by being partially sunken on one side to enable the receiving of the first pressure pad (110). At this time, it is preferable that the depth of the receiving portion be formed to be smaller than the height at which the first embossing (111) protrudes.

[0100] The storage portion can be formed in a shape corresponding to the shape of the first pressure pad (110) so that the first pressure pad (110) can be stored.

[0101] By means of the first pressure plate (120) in which such a storage portion is formed, the first pressure pad (110) can be detached or attached to the storage portion of the first pressure plate (120).

[0102] In addition, the second pressure plate (220) may be provided with a storage portion formed by being partially sunken on the other side to enable storage of the second pressure pad (210). At this time, it is preferable that the depth of the recess of the storage portion be formed smaller than the height at which the second embossing (211) protrudes.

[0103] The storage portion may be formed in a shape corresponding to the shape of the second pressure pad (210) so that the second pressure pad (210) can be stored therein. By the second pressure plate (220) having the storage portion formed therein, the second pressure pad (210) can be attached or detached to the storage portion of the second pressure plate (220).

[0104]

[0105] Fig. 8 is a front view of a pressurizing device according to a second embodiment of the present invention positioned on one side and the other side of a first pocket portion of a pouch-type secondary battery, and Fig. 9 is a perspective view of a first pressurizing portion of a pressurizing device according to a second embodiment of the present invention. In addition, Fig. 10 is a front view of a pressurizing device according to a second embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0106] The pressurizing device of the pouch-type secondary battery according to the second embodiment of the present invention includes a first pressurizing unit (100), a second pressurizing unit (200), and a driving unit (300), similar to the first embodiment.

[0107] However, unlike the first embodiment, in the second embodiment, when the pouch-type secondary battery (10) is positioned in a vertical direction, the first embossing (111) of the first pressure pad (110) and the second embossing (211) of the second pressure pad (210) can be formed in a shape that approaches the first pocket portion (11) as it goes downward (6 o'clock direction in FIG. 8).

[0108] Here, the upper and lower sides are, when the pouch-type secondary battery (10) is positioned vertically, the direction toward the second pocket portion (12) is the upper side (12 o'clock direction based on FIG. 8), and the direction toward the first pocket portion (11) is the lower side (6 o'clock direction based on FIG. 8).

[0109] For example, the first embossing (111) and the second embossing (211) of the first pressure pad (110) and the second pressure pad (210) may be provided so as to be inclined at a certain angle rather than parallel to the pouch-type secondary battery (10) so as to get closer to the first pocket portion (11) as they go downward.

[0110] In addition, as another example, the first embossing (111) and the second embossing (211) of the first pressure pad (110) and the second pressure pad (210) may be provided in an inclined shape so that the first pressure plate (120) and the second pressure plate (220) protrude toward the first pocket portion (11) as they go downward so as to get closer to the first pocket portion (11).

[0111] More preferably, the first embossing (111) and the second embossing (211) may be formed so that the protrusion height increases toward the bottom (6 o'clock direction as shown in FIG. 8). The first embossing (111) and the second embossing (211) may be formed so that the protrusion height decreases toward the top (12 o'clock direction as shown in FIG. 8).

[0112] Here, the protrusion height of the first embossing (111) means the height protruding from the first pressure plate (120) toward the first pocket portion (11) on the other side (3 o'clock direction based on FIG. 8), and the protrusion height of the second embossing (211) means the height protruding from the second pressure plate (220) toward the first pocket portion (11) on one side (9 o'clock direction based on FIG. 8).

[0113] As described above, since the first embossing (111) and the second embossing (211) are provided so as to come closer to the first pocket portion (11) as they go downward, when the first pressing portion (100) and the second pressing portion (200) press the first pocket portion (11), the first embossing (111) and the second embossing (211) first come into contact with the lower side of the first pocket portion (11), and thus the first pocket portion (11) can be sequentially pressed from the bottom toward the top.

[0114] In addition, it goes without saying that the first embossing (111) and the second embossing (211) can be provided so that the protrusion height increases as they go downward, as well as the size increases.

[0115] Each of the first pressure pad (110) and the second pressure pad (210) can be formed so that the gap between the plurality of first embossings (111) and the plurality of second embossings (211) becomes wider as it goes downward.

[0116] As illustrated in Fig. 10, when the first pressure pad (110) presses one side of the first pocket portion (11), the first embossing (111) located at the lowest side first comes into contact with one side of the first pocket portion (11), and then sequentially comes into contact with one side of the first pocket portion (11) while pressing the one side of the first pocket portion (11). At this time, since the first embossing (111) located at the lowest side continues to press the first embossing (111) until the first embossing (111) located at the highest side presses one side of the first pocket portion (11), the convexly protruding surface can spread while being pressed along one side of the first pocket portion (11). By this, the first pressure pad (110) can set the spacing between the first embossings (111) according to the protrusion height and size of the first embossings (111).

[0117] In the case of the second pressure pad (210), it is configured with the same configuration as the first pressure pad (110) described above, and the spacing between a plurality of second embossings (211) can be set according to the protrusion height and size of the second embossings (211).

[0118]

[0119] FIG. 11 is a drawing showing a pressurizing device according to a third embodiment of the present invention positioned on one side and the other side of a first pocket portion of a pouch-type secondary battery as viewed from above, and FIG. 12 is a perspective view of a first pressurizing portion of a pressurizing device according to a third embodiment of the present invention. In addition, FIG. 13 is a drawing showing a pressurizing device according to a third embodiment of the present invention pressurizing a first pocket portion of a pouch-type secondary battery.

[0120] The pressurizing device of the pouch-type secondary battery according to the third embodiment of the present invention includes a first pressurizing unit (100), a second pressurizing unit (200), and a driving unit (300), similar to the first and second embodiments.

[0121] However, unlike the first and second embodiments, in the third embodiment, the first pressure pad (110) may further include a first raised portion (112), and the second pressure pad (210) may further include a second raised portion (212).

[0122] The first raised portion (112) of the first pressure pad (110) may be provided to press the rounded sliding portion (11b) on one side of the first pocket portion (11), and the second raised portion (212) of the second pressure pad (210) may be provided to press the rounded sliding portion (11b) on the other side of the first pocket portion (11). At this time, the first embossing (111) and the second embossing (211) formed on the first pressure pad (110) and the second pressure pad (210) may press the double-sided flat portion (11a) of the first pocket portion (11).

[0123] The first raised portion (112) and the second raised portion (212) may be provided in a shape corresponding to the rounded shape of the sliding portion (11b), and the first raised portion (112) and the second raised portion (212) may be provided so as to protrude further than the protrusion heights of the first embossing (111) and the second embossing (211). More specifically, the first raised portion (112) and the second raised portion (212) may be provided so as to protrude further than the protrusion heights of the first embossing (111) and the second embossing (211) located at the lowest side.

[0124] For example, the first raised portion (112) and the second raised portion (212) may be provided to protrude further from the first embossing (111) and the second embossing (211) by the difference in height between the lowest height of the sliding portion (11b) and the flat portion (11a).

[0125]

[0126] Figure 14 is a flowchart for explaining a method of pressurizing a pouch-type secondary battery using a pressurizing device according to the present invention.

[0127] Referring to FIGS. 8 to 10 and FIG. 14, a pressurizing device according to the second embodiment will be described as an example. A pressurizing method of a pouch-type secondary battery according to the second embodiment of the present invention includes (S1) a step of positioning a pouch-type secondary battery (10) between a first pressurizing part (100) and a second pressurizing part (200), (S2) a step of operating a first driving member (310) and a second driving member (320) to move the first pressurizing part (100) and the second pressurizing part (200) to one side and the other side of the pouch-type secondary battery (10), respectively, and (S3) a step of pressurizing the first pocket part (11) by the first pressurizing pad (110) and the second pressurizing pad (210).

[0128] In step (S2), the first driving member (310) can move the first pressing member (100) to the other side (3 o'clock direction based on FIG. 8) so that the first pressing member (100) comes into contact with one surface of the first pocket part (11), and the second driving member (320) can move the second pressing member (200) to one side (9 o'clock direction based on FIG. 8) so that the second pressing member (200) comes into contact with the other surface of the first pocket part (11).

[0129] In addition, in step (S3), the first driving member (310) can move the first pressurizing portion (100) further to the other side so that the first pressurizing pad (110) can press one surface of the first pocket portion (11), and the second driving member (320) can move the second pressurizing portion (200) further to one side so that the second pressurizing pad (210) can press the other surface of the first pocket portion (11).

[0130] At this time, the lower side of the first pocket part (11) can be in contact with the first pressure pad (110) and the second pressure pad (210) first. In other words, in step (S3), the first embossing (111) located at the lowest side of the first pressure pad (110) and the second embossing (211) located at the lowest side of the second pressure pad (210) can be in contact with the first pocket part (11) first.

[0131] Accordingly, when the first pressurizing portion (100) and the second pressurizing portion (200) pressurize the first pocket portion (11), the first embossing (111) and the second embossing (211) located at the lowest side first come into contact with the lower side of the first pocket portion (11), and then sequentially pressurize the first pocket portion (11) from the bottom toward the top.

[0132] As a result, the gas existing inside the first pocket portion (11) can be moved from the bottom to the top, i.e., the second pocket portion (12), by the first embossing (111) of the first pressurizing pad (110) and the second embossing (211) of the second pressurizing pad (210). Of course, since the electrolyte stored in the first pocket portion (11) also moves upward by the pressurization of the first embossing (111) and the second embossing (211), the electrolyte impregnation performance of the electrode assembly can also be improved.

[0133] The pressurizing method using the pouch-type secondary battery pressurizing device according to the third embodiment of the present invention illustrated in FIGS. 11 to 13 is the same as the pouch-type secondary battery pressurizing method described above.

[0134] However, in step (S3), the first pressure pad (110) and the second pressure pad (210) can come into contact with the sliding portion (11b) on one side and the other side of the first pocket portion (11).

[0135] In other words, in step (S3), the first raised portion (112) of the first pressure pad (110) can be in contact with the sliding portion (11b) of one surface of the first pocket portion (11), and the second raised portion (212) of the second pressure pad (210) can be in contact with the sliding portion (11b) of the other surface of the first pocket portion (11).

[0136] At this time, since the first raised portion (112) and the second raised portion (212) press the sliding portion (11b) of the first pocket portion (11), even the gas located in the sliding portion (11b) can be effectively removed.

[0137]

[0138] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0139] (Explanation of symbols)

[0140] 10: Pouch-type secondary battery

[0141] 11: 1st pocket section

[0142] 11a: Flat section 11b: Sliding section

[0143] 12: Second pocket section

[0144] 13: Electrode lead

[0145] 100: First pressurized section

[0146] 110: First pressure pad

[0147] 111: First embossing 112: First raised portion

[0148] 120: First pressure plate

[0149] 200: Second pressurized section

[0150] 210: Second pressure pad

[0151] 211: Second embossing 212: Second raised portion

[0152] 220: Second pressurized plate

[0153] 300: Drive unit

[0154] 310: First driving member

[0155] 320: Second drive member

[0156] S1: First sealing section

[0157] S2: Second sealing section

Claims

1. A pressurizing device for a pouch-type secondary battery, comprising a first pocket portion for storing an electrode assembly in which a pair of electrode leads are positioned facing each other, and a first sealing portion at the edge of the first pocket portion, A first pressurizing portion that pressurizes one side of the first pocket portion; and Including a second pressurizing part that presses the other side of the first pocket part, The first pressurizing portion is provided with a first pressurizing pad having a plurality of first embossings formed toward one surface of the first pocket portion, A pressurizing device for a pouch-type secondary battery, characterized in that the second pressurizing portion is provided with a second pressurizing pad having a plurality of second embossings formed toward the other surface of the first pocket portion.

2. In paragraph 1, A pressurizing device for a pouch-type secondary battery, characterized in that when the pouch-type secondary battery is positioned vertically, the first embossing and the second embossing get closer to the first pocket portion as they go downward.

3. In paragraph 2, A pressurizing device for a pouch-type secondary battery, characterized in that the first embossing and the second embossing have a protrusion height that increases as they go downward.

4. In paragraph 2, A pressurizing device for a pouch-type secondary battery, characterized in that the first pressurizing pad and the second pressurizing pad are provided with an elastic member.

5. In paragraph 4, A pressurizing device for a pouch-type secondary battery, characterized in that the elastic member comprises a silicone material.

6. In paragraph 4, A pressurizing device for a pouch-type secondary battery, characterized in that the first embossing and the second embossing temporarily become flat when in contact with the first pocket portion.

7. In paragraph 2, The first pressure pad includes a first raised portion that presses the round sliding portion on one side of the first pocket portion, A pressurizing device for a pouch-type secondary battery, characterized in that the second pressurizing pad includes a second raised portion that presses the round sliding portion of the first pocket portion.

8. In paragraph 7, A pressurizing device for a pouch-type secondary battery, characterized in that the first raised portion and the second raised portion are provided in a shape corresponding to the round shape of the sliding portion.

9. In paragraph 2, The first pressurizing portion includes a first pressurizing plate provided on one surface of the first pressurizing pad to support the first pressurizing pad, A pressurizing device for a pouch-type secondary battery, characterized in that the second pressurizing portion includes a second pressurizing plate provided on the other surface of the second pressurizing pad to support the second pressurizing pad.

10. In paragraph 9, Further comprising a driving unit including a first driving member and a second driving member so as to drive the first pressurizing unit and the second pressurizing unit, The first driving unit is connected to one surface of the first pressure plate and moves the first pressure pad toward one surface of the first pocket unit, A pressurizing device for a pouch-type secondary battery, characterized in that the second driving member is connected to the second pressing plate surface and moves the second pressing pad toward the first pocket surface.

11. A method for pressurizing a pouch-type secondary battery using a pressurizing device according to any one of clauses 1 to 10, (S1) A step of positioning the pouch-type secondary battery between the first pressurizing portion and the second pressurizing portion; (S2) a step of operating the first driving member and the second driving member to move the first pressurizing portion and the second pressurizing portion to one side and the other side of the pouch-type secondary battery, respectively; and (S3) A pouch-type secondary battery pressurizing method, characterized in that it includes a step of pressurizing the first pocket portion by the first pressurizing pad and the second pressurizing pad.

12. In paragraph 11, A pouch-type secondary battery pressurizing method, characterized in that, in the above step (S3), the lower side of the first pocket part first comes into contact with the first pressurizing pad and the second pressurizing pad.

13. In paragraph 11, A pouch-type secondary battery pressurizing method, characterized in that, in the above step (S3), the first pressurizing pad and the second pressurizing pad are in contact with the sliding portion of one side and the other side of the first pocket portion.

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