Pouch-type secondary battery, pouch sealing device, and sealing method using same

Abstract

The present invention relates to a pouch-type secondary battery, a pouch sealing device, and a sealing method using same and, more particularly, to: a pouch-type secondary battery in which a drawing process of a pouch can be excluded and durability can be improved; a pouch sealing device; and a sealing method using same. According to an embodiment of the present invention, provided is a pouch-type secondary battery comprising: an electrode assembly provided with an electrode lead on at least any one of one side surface and the other side surface; and a pouch in which a middle part of a pouch film is folded to cover the upper surface, the lower surface, and the rear surface of the electrode assembly so as to surround the electrode assembly, and including a sealing part formed by thermally fusing edge parts positioned at the front surface and both side surfaces of the electrode assembly, wherein the sealing part comprises a folding sealing part that is positioned on each of one side surface and the other side surface of the electrode assembly and thermally fused by folding a portion of the pouch film, and the folding sealing part comprises: a front folding sealing part formed close to the front surface of the electrode assembly; and a rear folding sealing part formed close to the other side surface of the electrode assembly.

Description

Pouch-type secondary battery, pouch sealing device and sealing method using the same

[0001] The present invention relates to a pouch-type secondary battery, a pouch sealing device, and a sealing method thereof, and more specifically, to a pouch-type secondary battery, a pouch sealing device, and a sealing method using the same, which can eliminate a pouch drawing process and enhance durability.

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2024-0002157, dated January 5, 2024, and Republic of Korea Patent Application No. 10-2025-0001613, dated January 6, 2025, the entire contents of which are incorporated herein by reference.

[0003] Rechargeable secondary batteries are widely used as a power source for wireless mobile devices. Furthermore, secondary batteries are also attracting attention as a potential energy source for electric and hybrid electric vehicles, which are being proposed as a solution to air pollution caused by existing gasoline and diesel vehicles that use fossil fuels. Furthermore, the applications that utilize secondary batteries are diversifying significantly due to their advantages, and it is expected that secondary batteries will be applied to a wider range of fields and products in the future.

[0004] Secondary batteries are classified into cylindrical and prismatic batteries in which the electrode assembly is built into a cylindrical or prismatic metal can according to the shape of the battery case, and pouch-type batteries in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet. The electrode assembly built into the battery case is a power generating device capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive and negative electrodes. It is classified into a jelly-roll type in which a separator is interposed between long sheet-shaped positive and negative electrodes coated with an active material and wound, and a stack type in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked while being interposed between separators.

[0005] Pouch-type lithium secondary batteries are widely used, with the electrode assembly encapsulated in a pouch made of aluminum. The electrode assembly of a pouch-type battery cell is housed in a pouch case, which is the encapsulating material. Pouch-type batteries house the electrode assembly in a pouch made of a flexible polymer material with an irregular shape.

[0006] Figure 1 is an exploded perspective view schematically showing the configuration of a typical pouch-type secondary battery.

[0007] Referring to Fig. 1, the pouch (21), which is a case of a pouch-type battery cell (30), includes pouch films (21a, 21b) made of a flexible material. The pouch films (21a, 21b) are composed of a plurality of layers, such as an outer covering layer, a metal barrier layer, and an inner adhesive layer. A cup-shaped receiving portion for receiving an electrode assembly (20) may be formed in each of the upper pouch film (21a) and the lower pouch film (21b). The cup receiving portion may be formed only in either the upper pouch film or the lower pouch film, and in this case, the cup receiving portion (21b1) may be formed only in the lower pouch film.

[0008] A pouch-type battery cell (30) includes an electrode assembly (20) accommodated in a receiving portion (21b1) of the pouch (21). The electrode assembly (20) includes an electrode (not shown) in which an electrode active material is applied to an electrode plate, and electrode tabs (25a, 25b) connected to the electrode. The electrode includes a positive electrode and a negative electrode. The electrode assembly (20) includes a separator interposed between the positive electrode and the negative electrode. The electrode assembly (20) is formed with positive electrode tabs (25a) extending to one side of a plurality of positive electrodes and negative electrode tabs (25b) extending to one side of a plurality of negative electrodes.

[0009] A pouch-type battery cell (30) includes an electrode lead (50). The electrode lead (50) is divided into a positive electrode lead (52) and a negative electrode lead (51) according to polarity. The positive electrode lead (52) and the negative electrode lead (51) are pulled outward when the electrode assembly (20) is accommodated in the pouch case, thereby performing the function of forming an electrical connection with an external terminal (not shown). Each of the positive electrode lead (52) and the negative electrode lead (51) is provided with a lead film (27) for electrical insulation of the portion in contact with the pouch (21).

[0010] And, this electrode assembly (20) is accommodated in a receiving portion (21b1) formed in a lower pouch film (21b). With this electrode assembly (20) accommodated in the receiving portion (21b1), an electrolyte is injected, and after performing an initial charge / discharge (activation process), the edge portions (21b2) of the upper pouch film (21a) and the lower pouch film (21b) are heat-sealed to form a seal.

[0011] Meanwhile, Fig. 1 illustrates an upper pouch film (21a) and a lower pouch film (21b) being separated and joined together. In contrast, the upper pouch film and the lower pouch film are a single pouch film, and folding of the pouch film can be performed on one of the four sides.

[0012] Figure 2 is a vertical cross-sectional view showing the forming process of a pouch forming device of the prior art. Figure 3 is a vertical cross-sectional view of a pouch film formed using a pouch forming device of the prior art.

[0013] Conventionally, a secondary battery receiving portion (21b1) is formed on a pouch film (21b) using a drawing forming method, an electrode assembly (20) is accommodated in the secondary battery receiving portion (21b1), and then the edge portions (21b2) of each of the upper pouch film (21a) and the lower pouch film (21b) are sealed to manufacture a pouch (21). The drawing forming method is performed by fixing the pouch film (21b) to a fixing member (11) and stretching the fixed pouch film (21b) with a punch member (12).

[0014] However, in the drawing forming process of the laminate sheet, when the fixing members (11) fix the edge of the pouch film (21b) and the punch member (12) presses the center of the pouch film (21b) from the top to the bottom to form the secondary battery receiving portion, the pressing force applied to the pouch film is likely to be concentrated on a specific portion, for example, a corner portion of a cup shape, and the problem that excessive stretching is likely to occur in the corner portion (C) of the secondary battery receiving portion is not recognized.

[0015] That is, the corner part (C) of the secondary battery receiving portion of the prior art is a part that is structurally bent during shape processing and is severely deformed, and the difference in elongation between the outer surface and the inner surface is so extreme that it can become vulnerable.

[0016] Accordingly, the prior patent does not solve problems such as the appearance of the pouch secondary battery being impaired due to excessive elongation of the corner portion (C) or the lifespan of the pouch being shortened due to the creation of a weak point due to the thinness of the corner portion.

[0017] Moreover, when the lower pouch film (10b) is pressed from the top to the bottom by the punch member (12) to form the secondary battery receiving portion, a tensile difference between the layers forming the pouch film is likely to occur. In addition, when processing the shape of the secondary battery receiving portion of the pouch film, the difference in elongation accumulated on the upper and lower surfaces of the pouch from the center to the edge of the pouch film may be clearly visible at the edge. As a result, as shown in FIG. 3, in the prior art, a curling phenomenon occurred in which the edge portion (21b2) of the pouch (21) was bent upward.

[0018] This curling phenomenon caused difficulties in the sealing or bending process of the edge of the pouch film in subsequent processes, and it was easy for the edge of the pouch film to be folded, which increased the defect rate due to the edge being sealed while being folded.

[0019] Therefore, there is a need to propose a pouch forming device and a pouch-type secondary battery manufacturing method that can prevent excessive stretching at the edge of a secondary battery receiving portion of a conventional pouch film and reduce curling at the edge.

[0020] Meanwhile, as the applications for pouch-type secondary batteries diversify, demand for high-efficiency and high-capacity secondary batteries increases. This can lead to increased electrode assembly thickness, which in turn can further increase the forming depth of the pouch. However, there are limits to the possible forming depth relative to the pouch area. Furthermore, there are limitations to further increasing the thickness of the pouch film.

[0021] Accordingly, there is a need to provide a secondary battery manufacturing method and manufacturing device capable of effectively accommodating an electrode assembly with increased thickness while using an existing pouch film, and a secondary battery manufactured using the same.

[0022] The purpose of the present invention is to solve the problem of low durability and high failure rate of conventional pouch-type secondary batteries.

[0023] Through one embodiment of the present invention, a pouch film is folded so that both ends meet to accommodate an electrode assembly, thereby enabling a compact pouch-type secondary battery to be manufactured without performing a separate drawing molding process to form a receiving portion for an electrode assembly in a pouch. In order to solve the problems of the prior art, such as excessive stretching occurring at the corners of the secondary battery receiving portion, thereby reducing durability, and causing a curling phenomenon in which the edges are bent, a pouch sealing device is provided.

[0024] Through one embodiment of the present invention, it is intended to provide a pouch-type secondary battery, a manufacturing method, and a manufacturing device, which can effectively perform pouch sealing even when the drawing forming process is omitted or the depth is minimized when the thickness of the electrode assembly is relatively large.

[0025] In order to achieve the above-described object, according to one embodiment of the present invention, a pouch-type secondary battery may be provided, including: an electrode assembly having an electrode lead provided on at least one of one side and the other side; and a pouch having a sealing portion formed by heat-melting edge portions located on the front and both sides of the electrode assembly, wherein the sealing portion is located on each of one side and the other side of the electrode assembly and includes a folding sealing portion formed by folding a portion of the pouch film and heat-melting it, and the folding sealing portion includes a front folding sealing portion formed close to the front of the electrode assembly and a rear folding sealing portion formed close to the other side of the electrode assembly.

[0026] The above electrode assembly is formed in a rectangular parallelepiped shape, has a flat upper surface and lower surface, and may have four side surfaces, namely a front surface, a back surface, one side surface, and the other side surface. The pouch sealing on both sides, namely one side surface and the other side surface, may be referred to as top sealing, and the pouch sealing on the front surface may be referred to as side sealing. Since the pouch is folded on the back surface, separate sealing may not be performed.

[0027] For example, electrolyte injection, degassing and final sealing can be performed at the front portion of the electrode assembly where side sealing is performed.

[0028] Forming processing of the pouch for insertion of the above electrode assembly may be excluded.

[0029] By forming the pouch for inserting the electrode assembly, the forming depth can be formed to be less than 0.5 times the thickness of the electrode assembly.

[0030] If the forming depth of the upper pouch film and the lower pouch film is 0.5 times the thickness of the electrode assembly, regardless of the thickness of the electrode assembly, top sealing can be performed with the upper pouch film and the lower pouch film horizontally overlapped. However, there is a limit to increasing the forming depth as the thickness of the electrode assembly increases. That is, the forming depth may be less than 0.5 times, and further, forming may not be performed.

[0031] Therefore, it is important to eliminate the gap between the upper pouch film and the lower pouch film during top sealing so that the two are horizontally overlapped.

[0032] For this purpose, a folding sealing portion and a general sealing portion may be formed in the top sealing portion. In particular, the folding sealing portions may be formed at the front and rear, respectively. In addition, a general sealing portion may be formed between the front folding sealing portion and the rear folding sealing portion.

[0033] The above general sealing portion may mean that the edge portion of the pouch film (upper pouch film) covering the upper surface of the electrode assembly and the edge portion of the pouch film (lower pouch film) covering the lower surface of the electrode assembly are formed by heat-sealing each other.

[0034] The above general sealing portion can be formed to be located on the front and both sides (one side and the other side) of the electrode assembly.

[0035] It is preferable that the above-mentioned front folding sealing portion includes an upper protrusion formed by folding the edge of the pouch film covering the upper surface of the electrode assembly back and forth, and a lower protrusion formed by folding the edge of the pouch film covering the lower surface of the electrode assembly back and forth.

[0036] It is preferable that the upper protrusion and the lower protrusion are positioned further forward than the electrode lead.

[0037] The general sealing portion may be formed to cross the electrode lead back and forth, the front folding sealing portion may be formed in front of the general sealing portion, and the rear folding sealing portion may be formed in the rear of the general sealing portion.

[0038] The above general sealing portion can be formed in front of the above front folding sealing portion.

[0039] The above-mentioned front folding sealing portion can be folded so as to overlap the above-mentioned general sealing portion vertically.

[0040] It is preferable that the above rear folding sealing portion includes a rear folding sealing portion that is folded and heat-sealed so that a portion of the folded middle portion of the pouch film overlaps.

[0041] It is preferable that the rear folding sealing portion includes a first branch portion formed between the edge portion of the pouch film covering the rear surface of the electrode assembly and the edge portion of the pouch film covering the upper surface of the electrode assembly; and a second branch portion formed between the edge portion of the pouch film covering the rear surface of the electrode assembly and the edge portion of the pouch film covering the lower surface of the electrode assembly.

[0042] It is preferable that the above rear folding sealing portion be folded so as to overlap the above general sealing portion vertically.

[0043] In order to achieve the above-described object, according to one embodiment of the present invention, a method for manufacturing a pouch-type secondary battery by sealing an electrode assembly having an electrode lead provided on at least one of one side and the other side and a pouch film covering the electrode assembly, the method including a top sealing step of forming a sealing portion by heat-melting edge portions located on each of one side and the other side of the electrode assembly while the middle portion of the pouch film is folded to cover the upper surface, lower surface, and rear surface of the electrode assembly, wherein the sealing portion includes a folding sealing portion in which a portion of the pouch film is folded and heat-melted, and the folding sealing portion includes a front folding sealing portion formed close to the front surface of the electrode assembly and a rear folding sealing portion formed close to the other side of the electrode assembly.

[0044] The above manufacturing method may include a side sealing step of forming a sealing portion by heat-welding the edge portions located on each front side of the electrode assembly.

[0045] The side sealing step may include a primary side sealing performed before the degassing process and a secondary side sealing performed after the degassing process is completed.

[0046] The top sealing step may be performed before the side sealing step.

[0047] The top sealing step may include a heating step of heating a plurality of sealing blocks through a heating unit; a moving step of moving the plurality of sealing blocks to a pressing position of the pouch film in a heated state through a block moving unit; and a pressing step of forming the sealing portion by having the plurality of sealing blocks press the pouch film.

[0048] In order to achieve the above-described object, according to one embodiment of the present invention, a pouch-type secondary battery can be provided, including: an electrode assembly having an electrode lead on at least one of one side and the other side; and a pouch having a sealing portion formed by heat-sealing a border portion and a middle portion of a pouch film being folded so that a front end and a rear end meet each other to surround the electrode assembly; wherein the sealing portion includes a folding sealing portion that is folded so that a portion of the pouch film overlaps and is heat-sealed.

[0049] The pouch is divided into a receiving area in which the electrode assembly is received, and a degassing area that is connected to the receiving area and temporarily receives gas generated in an activation process, and the folding sealing portion may include a front folding sealing portion formed between the receiving area and the degassing area.

[0050] The above front folding sealing portion may include an upper protrusion folded in a shape such that a portion of the upper part of the folded pouch film overlaps; and a lower protrusion folded in a shape such that a portion of the lower part of the folded pouch film overlaps.

[0051] The above sealing portion has a general sealing portion formed by heat-melting both ends of the pouch film, and each of the upper protrusion and the lower protrusion can be bent to cover the general sealing portion.

[0052] The above folding sealing portion may include a rear folding sealing portion that is folded and heat-sealed so that a portion of the folded middle portion of the pouch film overlaps.

[0053] The above rear folding sealing portion may have a first branch portion and a second branch portion, each of which is folded so that a portion of the middle portion of the pouch film overlaps and has a shape of being divided into two branches from one.

[0054] The first branch portion and the second branch portion can be bent to overlap each other.

[0055] The pouch may include a side sealing portion formed on a side of the electrode assembly where the electrode lead is not positioned and formed by heat-sealing.

[0056] In order to achieve the above-described object, according to one embodiment of the present invention, a sealing device for a pouch-type secondary battery is provided for sealing a pouch in which a middle portion is folded so that both ends of a pouch film meet each other to wrap an electrode assembly having electrode leads, the sealing device comprising: a heating unit configured to generate heat for sealing the pouch; a plurality of sealing blocks connected to the heating unit to conduct heat, the sealing unit having a folding sealing unit in which the electrode leads are interposed between the upper and lower portions of the folded pouch film and a portion of the folded pouch film is folded so as to overlap and heat-fuse; and a block moving unit configured to move the plurality of sealing blocks so as to pressurize a sealing region of the pouch while the plurality of sealing blocks are heated.

[0057] The pouch may be divided into a receiving area in which the electrode assembly is received and a degassing area connected to the receiving area and for temporarily receiving gas generated in an activation process, and the plurality of sealing blocks may include a one-sided sealing block configured to pressurize a folded middle portion of the pouch film in the sealing area; a middle sealing block configured to pressurize a portion corresponding to the receiving area in the sealing area; and a other-sided sealing block configured to pressurize a portion corresponding to the degassing area in the sealing area.

[0058] The above intermediate sealing block may include an intermediate upper block configured to press the upper portion of the folded pouch film in a downward direction; and an intermediate lower block configured to press the lower portion of the folded pouch film in an upward direction.

[0059] The above one-sided sealing block may be arranged to pressurize the folded middle portion of the pouch film to form a rear folding sealing portion folded so that a portion of the middle portion overlaps.

[0060] The above intermediate sealing block may be provided to support the folded intermediate portion of the pouch film in a direction opposite to the pressing direction of the one-side sealing block to form the rear folding sealing portion.

[0061] The rear folding sealing portion may include a first branch portion and a second branch portion having a shape branched from one, and each of the intermediate sealing block and the one-side sealing block may include an inclined surface and a curved surface that pressurize the folded intermediate portion of the pouch film to form the first branch portion and the second branch portion.

[0062] The above intermediate sealing block and the other side sealing block may be arranged to pressurize a portion between the receiving area for receiving the electrode assembly and the degassing area to form a front folding sealing portion in a folded shape so that a portion of the pouch film overlaps.

[0063] The other side sealing block may be configured to pressurize a portion between an area that accommodates the electrode assembly and a degassing area in a diagonal direction to form the front folding sealing portion, and the middle sealing block may be configured to support a portion between the area that accommodates the electrode assembly and the degassing area in a direction opposite to the pressing direction of the other side sealing block.

[0064] The other side sealing block may include an upper block on the other side, which is configured to pressurize a portion between the receiving area and the degassing area together with the intermediate upper block to form an upper protrusion in a folded shape so that a portion thereof overlaps; and an lower block on the other side, which is configured to pressurize a portion between the receiving area and the degassing area together with the intermediate lower block to form a lower protrusion in a folded shape so that a portion thereof overlaps.

[0065] The upper block on the other side and the lower block on the other side may be arranged to press toward both ends of the pouch film to form a general sealing portion.

[0066] The sealing device for a secondary battery of the present invention may further include a plurality of bending blocks each of which is arranged to bend the upper protrusion and the lower protrusion to cover the general sealing portion; and a bending moving unit arranged to move the plurality of bending blocks.

[0067] The sealing device for a secondary battery of the present invention may further include a plurality of side sealing blocks connected to the heating unit to conduct heat and configured to form a side sealing unit by pressing, in a heated state, a portion of the pouch corresponding to a side of the electrode assembly where the electrode lead is not positioned by the block moving unit.

[0068] In order to achieve the above-mentioned object, according to one embodiment of the present invention, a method of sealing a pouch-type secondary battery is provided using a sealing device for a secondary battery including a heating unit, a plurality of sealing blocks, and a block moving unit to seal a pouch provided to surround an electrode assembly having electrode leads by folding a middle portion of a pouch film so that both ends meet each other, the sealing method comprising: a heating step in which the heating unit heats the plurality of sealing blocks; a moving step in which the block moving unit moves the plurality of sealing blocks so that the plurality of sealing blocks pressurize a sealing region of the pouch in a heated state; and a pressing step in which the plurality of sealing blocks pressurize and seal an edge portion of the pouch in a heated state, the electrode leads being interposed between the upper and lower portions of the folded pouch film, and a sealing unit having a folding sealing unit that is folded and heat-fused so that a portion of the pouch film overlaps.

[0069] In order to improve the problems in the prior art, through one embodiment of the present invention, a pouch film is folded in the middle so that both ends meet to wrap the electrode assembly, thereby enabling a compact pouch-type secondary battery to be manufactured without performing a separate drawing molding process to form a receiving portion for the electrode assembly in the pouch, thereby providing a pouch sealing device that can solve the problems of excessive stretching occurring at the corner portion of the receiving portion of the secondary battery in the prior art, thereby reducing durability and causing a curling phenomenon in which the edge portion is bent.

[0070] Through one embodiment of the present invention, a pouch-type secondary battery, a manufacturing method, and a manufacturing device can be provided, which can effectively perform pouch sealing even when the drawing forming process is omitted or the depth is minimized when the thickness of the electrode assembly is relatively large.

[0071] Figure 1 is an exploded perspective view schematically showing the configuration of a typical pouch-type secondary battery.

[0072] Fig. 2 is a cross-sectional view schematically showing a state in which a sealing portion is formed in a pouch-type secondary battery using a pouch sealing device of the prior art.

[0073] Figure 3 is a cross-sectional view schematically showing a sealing portion formed in a pouch-type secondary battery using a pouch sealing device of the prior art.

[0074] Figure 4 is a perspective view schematically showing the appearance of a pouch-type secondary battery before the sealing process according to one embodiment of the present invention.

[0075] Figure 5 is a side view schematically showing the appearance of a pouch-type secondary battery after a sealing process according to one embodiment of the present invention.

[0076] Figure 6 is a conceptual diagram showing the configurations of a pouch sealing device according to one embodiment of the present invention.

[0077] FIGS. 7 to 9 are side views schematically illustrating a process of forming a sealing portion of a pouch-type secondary battery using a pouch sealing device according to one embodiment of the present invention.

[0078] FIG. 10 and FIG. 11 are side views schematically illustrating a process of forming a sealing portion of a pouch-type secondary battery using a pouch sealing device according to one embodiment of the present invention.

[0079] FIG. 12 is a cross-sectional view schematically showing a side sealing portion of a pouch-type secondary battery formed using a pouch sealing device according to one embodiment of the present invention.

[0080] Figure 13 is a flowchart showing a method for sealing a pouch-type secondary battery according to one embodiment of the present invention.

[0081] Hereinafter, a pouch-type secondary battery, a pouch sealing device, and a sealing method according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0082] In addition, regardless of the drawing symbol, identical or corresponding components are given identical or similar reference numbers and redundant descriptions thereof are omitted, and for the convenience of explanation, the size and shape of each component depicted may be exaggerated or reduced.

[0083] Fig. 4 is a perspective view schematically illustrating the appearance of a pouch-type secondary battery (100) according to one embodiment of the present invention before the sealing process. And, Fig. 5 is a side view schematically illustrating the appearance of a pouch-type secondary battery (100) according to one embodiment of the present invention after the sealing process.

[0084] Referring to FIGS. 4 and 5, a pouch-type secondary battery (100) according to one embodiment of the present invention includes an electrode assembly (120). The electrode assembly (120) is provided with an electrode lead (151) on at least one of one side and the other side. For example, as shown in FIG. 4, the electrode assembly (120) may be provided with an electrode lead (151) on each of one side and the other side in the Y-axis direction.

[0085] In addition, the pouch-type secondary battery (100) of the present invention includes a pouch (110). The pouch (110) may be formed by folding the middle portion (M) of the pouch film (111) so that the two ends in the X-axis direction meet each other. The pouch (110) may be provided so that the electrode assembly (120) is accommodated in the space spaced between the upper portion (111a) and the lower portion (111b) of the folded pouch film (111). The pouch (110) is provided with a sealing portion (140) formed by heat-sealing the edge portion. At this time, a separate structure for accommodating the electrode assembly (120) is not formed in the pouch (110) through shape processing such as stretching. That is, the pouch (110) may be formed by sealing the edge portion in a form in which the middle portion (M) of the sheet-shaped pouch film (111) is folded.

[0086] Accordingly, the pouch-type secondary battery (100) of the present invention is provided so that the middle portion (M) of the pouch film (111) is folded so that both ends meet to wrap the electrode assembly (120), thereby eliminating the need for a separate drawing forming process to form a receiving portion of the electrode assembly (120) in the pouch (110), thereby solving the problems of excessive stretching occurring in the corner portion (part C of FIG. 3) of the receiving portion of the secondary battery in the prior art, thereby reducing durability and causing a curling phenomenon in which the edge portion bends.

[0087] Specifically, the sealing portion (140) may be formed by heat-sealing the edge portion of the upper portion (111a) and the edge portion of the lower portion (111b) of the folded pouch film (111) in the middle portion (M) to each other. The sealing portion (140) may include at least one of a one-side sealing portion (140) and an other-side sealing portion (140) in which an electrode lead (151) is interposed between the upper portion (111a) and the lower portion (111b) of the folded pouch film (111). For example, when an electrode lead (151) is provided on each of one side and the other side of the secondary battery (100), the sealing portion (140) may include a one-side sealing portion (140) and an other-side sealing portion (140) in which an electrode lead (151) is interposed between the upper portion (111a) and the lower portion (111b) of the folded pouch film (111).

[0088] This sealing portion (140) may include a folding sealing portion (122). The folding sealing portion (122) may have a folded shape such that a portion of the upper portion (111a) or the lower portion (111b) of the folded pouch film (111) overlaps. The folding sealing portion (122) may be provided in at least one of the one-side sealing portion (140) and the other-side sealing portion (140) in which the electrode lead (151) is interposed between the upper and lower portions of the folded pouch film (111).

[0089] Accordingly, the sealing portion (140) of the pouch-type secondary battery (100) of the present invention has a folding sealing portion (122) on at least one of the one-side sealing portion (140) and the other-side sealing portion (140), thereby effectively reducing the empty space on one side and the other side of the electrode assembly (120) that is not filled with the internal components of the pouch-type secondary battery (100). Accordingly, the pouch-type secondary battery (100) of the present invention can have a more compact shape, thereby effectively increasing the energy density of the secondary battery.

[0090] In addition, the pouch (110) may include a receiving area (P) in which a receiving space for receiving the electrode assembly (120) is formed. The pouch (110) may include a degassing area (U). The degassing area (U) may temporarily become a passage for discharging gas generated from the receiving area (P). That is, the degassing area (U) may have a temporary receiving space for temporarily receiving gas generated in the activation process of the secondary battery. That is, the pouch (110) may be largely divided into a receiving area (P) and a degassing area (U).

[0091] In addition, the folding sealing portion (122) may include a front folding sealing portion (122a). The front folding sealing portion (122a) may be formed between a portion corresponding to the receiving area (P) and a portion corresponding to the degassing area (U) in the sealing portion (140). That is, the front folding sealing portion (122a) may be provided at the boundary between the space in which the electrode assembly (120) is received in the pouch (110) and the temporary receiving space for receiving the generated gas. Therefore, the pouch-type secondary battery (100) of the present invention can minimize an empty space that may be generated in the receiving space of the electrode assembly (120) by forming such a front folding sealing portion (122a).

[0092] Specifically, the front folding sealing portion (122a) may include an upper protrusion (122a1) and a lower protrusion (122a2). The upper protrusion (122a1) may have a folded shape so that a portion of the upper portion (111a) of the folded pouch film (111) overlaps with it. The lower protrusion (122a2) may have a folded shape so that a portion of the lower portion (111b) of the folded pouch film (111) overlaps with it. The pouch-type secondary battery (100) of the present invention can minimize the empty space in the internal space of the pouch (110) that is not filled with the electrode assembly (120) and the electrolyte by forming the upper protrusion (122a1) and the lower protrusion (122a2).

[0093] In addition, each of the one-side sealing portion (140) and the other-side sealing portion (140) may be provided with a general sealing portion (124). The general sealing portion (124) may be a sealing portion (140) formed by heat-sealing both ends of the pouch film (111) to each other. For example, the pouch (110) may be provided with a general sealing portion (124) formed by heat-sealing both ends of the pouch film (111) in the folding direction (positive direction of the X-axis) to each of the one-side sealing portion (140) and the other-side sealing portion (140). Each of the upper protrusion (122a1) and the lower protrusion (122a2) may have a bent shape so as to be covered with the general sealing portion (124). That is, the upper protrusion (122a1) bent horizontally may be positioned at the upper portion of the general sealing portion (124), and the lower protrusion (122a2) bent horizontally may be positioned at the lower portion (111b) of the general sealing portion (124). Therefore, the pouch-type secondary battery (100) of the present invention has the upper protrusion (122a1) and the lower protrusion (122a2) bent so as to be covered with the general sealing portion (124), thereby becoming a more compact pouch-type secondary battery (100), and thus a battery pack with a high energy density may be manufactured. In addition, when a plurality of pouch-type secondary batteries (100) of the present invention are stacked vertically, a larger space may be secured at one side and the other side of the stacked pouch-type secondary batteries (100), thereby having the advantage of increasing the heat dissipation of the battery pack.

[0094] In addition, the folding sealing portion (122) may include a rear folding sealing portion (122b) formed on the folded middle portion (M) of the pouch film (111). That is, the rear folding sealing portion (122b) may be provided on the folded portion of the pouch film (111). In addition, the rear folding sealing portion (122b) may include a first branch portion (122b1) and a second branch portion (122b2). The first branch portion (122b1) and the second branch portion (122b2) may have a form in which one branch is branched into two branches. Each of the first branch portion (122b1) and the second branch portion (122b2) may be formed by heat-sealing while being folded so that a portion of the middle portion (M) of the pouch film (111) overlaps.

[0095] In addition, the first branch portion (122b1) and the second branch portion (122b2) may have a folded shape so as to overlap each other. For example, as shown in FIG. 5, the first branch portion (122b1) and the second branch portion (122b2) may have a folded shape in the opposite direction to the folding direction (negative direction of the X-axis). Therefore, the pouch-type secondary battery (100) of the present invention has a folded shape so as to overlap each other, thereby becoming a more compact pouch-type secondary battery (100), and thus making it possible to manufacture a battery pack with a high energy density. In addition, when a plurality of pouch-type secondary batteries (100) of the present invention are stacked in the vertical direction, a larger space can be secured on one side and the other side of the stacked pouch-type secondary batteries (100), so that there is an advantage in that the heat dissipation of the battery pack can be improved.

[0096] In addition, the pouch (110) may include a side sealing portion (126). The side sealing portion (126) may be formed by heat fusion. The side sealing portion (126) may be formed on a side of the electrode assembly (120) where the electrode lead (151) is not positioned. For example, as shown in FIG. 4, the pouch (110) may be provided with the side sealing portion (126) at the positive end of the X-axis of the pouch film (111).

[0097] Fig. 6 is a conceptual diagram illustrating the configuration of a pouch sealing device (200) according to one embodiment of the present invention. In addition, Figs. 7 to 9 are side views schematically illustrating the formation of a sealing portion (140) of a pouch-type secondary battery using a pouch sealing device (200) according to one embodiment of the present invention.

[0098] Referring to FIGS. 6 to 9, the present invention provides a sealing device (200) for a secondary battery according to one embodiment of the present invention. The sealing device (200) for a secondary battery of the present invention may be a device for sealing a pouch (110) in which a middle portion (M) is folded so that both ends of a pouch film (111) meet each other to wrap an electrode assembly (120) provided with an electrode lead (151).

[0099] In addition, the sealing device (200) for a secondary battery of the present invention includes a heating unit (210). The heating unit (210) is provided to generate heat for sealing the pouch (110). For example, the heating unit (210) may be provided with a plurality of heating units (not shown) each having a built-in heater so as to heat a plurality of blocks. That is, the heating unit (210) may generate heat so that a plurality of sealing blocks (220) described below can be heated to a heat-bonding temperature of the pouch film (111). For example, the heat-bonding temperature of the pouch (110) may be 120 degrees Celsius to 250 degrees Celsius.

[0100] In addition, the sealing device (200) for a secondary battery of the present invention may further include a control unit (280). The control unit (280) may control the operation of the heating unit (210) so that the sealing block (220) can be heated to the thermal bonding temperature of the pouch film (111).

[0101] In addition, the sealing device (200) for a secondary battery of the present invention includes a plurality of sealing blocks (220). The plurality of sealing blocks (220) may be directly connected to the heating unit (210) to conduct heat. That is, one surface of the heating unit (210) and one surface of the plurality of sealing blocks (220) may be provided to be in contact with each other. The plurality of sealing blocks (220) may form at least one of a one-side sealing unit (140) and an other-side sealing unit (140) in which an electrode lead (151) is interposed between the upper portion (111a) and the lower portion (111b) of the folded pouch film (111). In addition, at least one of the one-side sealing unit (140) and the other-side sealing unit (140) may be provided with a folding sealing unit (122). The folding sealing portion (122) may have a folded shape such that a portion of the upper portion (111a) or lower portion (111b) of the pouch film (111) overlaps.

[0102] In addition, the sealing device (200) for a secondary battery of the present invention may include a block moving unit (230). The block moving unit (230) moves a plurality of sealing blocks (220) so that the sealing area of ​​the pouch (110) is pressed while the plurality of sealing blocks (220) are heated. For example, the block moving unit (230) may be equipped with a plurality of sealing moving units so as to move each of the plurality of sealing blocks (220). For example, the sealing moving unit may be a servo cylinder (not shown) equipped with a servo motor. The control unit (280) may control the operation of the block moving unit (230) so that the sealing blocks (220) can press the pouch film (111).

[0103] Accordingly, the sealing device (200) for a secondary battery according to one embodiment of the present invention can manufacture a pouch-type secondary battery (100) in which at least one of the sealing part (140) on one side (140) and the sealing part (140) on the other side has a folding sealing part (122), thereby effectively reducing the empty space on one side and the other side of the electrode assembly (120) where internal components are not filled. Accordingly, the sealing device (200) for a secondary battery of the present invention can manufacture a pouch-type secondary battery (100) having a more compact form and effectively increasing energy density.

[0104] Additionally, the pouch (110) can be divided into a receiving area (P) in which the electrode assembly (120) is received and a degassing area (U) for temporarily receiving gas generated in the activation process.

[0105] Specifically, the plurality of sealing blocks (220) may include a single-sided sealing block (222). The single-sided sealing block (222) may be configured to pressurize the folded middle portion (M) of the pouch film (111) in the sealing area (edge ​​portion of the pouch film (111)) of the pouch (110).

[0106] In addition, the plurality of sealing blocks (220) may include an intermediate sealing block (224). The intermediate sealing block (224) may be provided to pressurize a portion corresponding to the receiving area (P) in the sealing area. In addition, the plurality of sealing blocks (220) may include an opposite side sealing block (226). The opposite side sealing block (226) may be provided to pressurize a portion corresponding to the degassing area (U) in the sealing area of ​​the pouch (110).

[0107] More specifically, the intermediate sealing block (224) may include an intermediate upper block (224a) and an intermediate lower block (224b). The intermediate upper block (224a) may be provided to press the upper portion (111a) of the folded pouch film (111) downward. The intermediate lower block (224b) may be provided to press the lower portion (111b) of the folded pouch film (111) upward.

[0108] In addition, the one-side sealing block (222) may be arranged to form a rear folding sealing portion (122b) folded so that a part of the middle portion (M) of the pouch film (111) overlaps with the middle sealing block (224). The one-side sealing block (222) may be arranged to pressurize the folded middle portion (M) of the pouch film (111) in the folding direction (positive direction of the X-axis). At this time, as shown in FIG. 8, the middle sealing block (224) may be arranged to support the folded middle portion (M) of the pouch film (111) in a direction opposite to the pressing direction of the one-side sealing block (222) to form the rear folding sealing portion (122b).

[0109] In addition, the rear folding sealing portion (122b) may include a first branch portion (122b1) and a second branch portion (122b2) having a branched shape from one. Each of the middle sealing block (224) and the one-side sealing block (222) may include an inclined surface (L) and a curved surface (D) that press the folded middle portion (M) of the pouch film (111) to form the first branch portion (122b1) and the second branch portion (122b2). For example, as shown in FIG. 7, the one-side sealing block (222) may have a curved surface (D) formed at a portion corresponding to the middle portion (M) of the pouch film (111), and inclined surfaces (L) may be formed on the upper and lower sides of the curved surface (D). The middle upper block (224a) of the middle sealing block (224) may have a curved surface (D) formed in a portion corresponding to the middle portion (M) of the pouch film (111), and an inclined surface (L) may be formed on the upper side of the curved surface (D). The middle lower block (224b) may have a curved surface (D) formed in a portion corresponding to the middle portion (M) of the pouch film (111), and an inclined surface (L) may be formed on the lower side of the curved surface (D). Accordingly, by forming the curved surface (D) and the inclined surface (L) on each of the middle sealing block (224) and the one-side sealing block (222), the first branch portion (122b1) and the second branch portion (122b2) may be effectively formed.

[0110] In addition, the intermediate sealing block (224) and the other side sealing block (226) may be arranged to form a front folding sealing portion (122a) in a folded form so that a portion of the pouch film (111) overlaps. To this end, the intermediate sealing block (224) and the other side sealing block (226) may be arranged to pressurize a portion between the receiving area (P) for receiving the electrode assembly (120) and the degassing area (U). At this time, the other side sealing block (226) may pressurize the portion between the area for receiving the electrode assembly (120) and the degassing area (U) in a diagonal direction to form the front folding sealing portion (122a). At this time, the middle sealing block (224) may be provided to support a portion between the receiving area (P) that receives the electrode assembly (120) and the degassing area (U) in a direction opposite to the pressing direction of the other sealing block (226).

[0111] In addition, the other side sealing block (226) may include the other side upper block (226a). The other side sealing block (226) may be provided to form an upper protrusion (122a1) in a folded form so that a portion of the upper portion (111a) of the pouch film (111) overlaps. To this end, the other side upper block (226a) may pressurize a portion between the receiving area (P) and the degassing area (U) together with the middle upper block (224a). At this time, the other side upper block (226a) may pressurize in a downwardly inclined diagonal direction so that a portion of the upper portion of the folded pouch film (111) is folded in an overlapping form.

[0112] In addition, the other side sealing block (226) may include the other side lower block (226b). The other side sealing block (226) may be provided to form a lower protrusion (122a2) in a folded form so that a portion of the lower portion (111b) of the pouch film (111) overlaps. To this end, the other side lower block (226b) may pressurize a portion between the receiving area (P) and the degassing area (U) together with the intermediate lower block (224b). At this time, the other side lower block (226b) may pressurize in an upwardly inclined diagonal direction so that a portion of the lower portion (111b) of the folded pouch film (111) is folded in an overlapping form.

[0113] In addition, the upper block (226a) and the lower block (226b) on the other side may be arranged to press toward both ends of the pouch film (111) to form a general sealing portion (124). That is, the upper block (226a) on the other side may press downwards both ends of the pouch film (111), and the lower block (226b) on the other side may press upwards both ends of the pouch film (111) to form a general sealing portion (124).

[0114] FIG. 10 and FIG. 11 are side views schematically showing a state in which a sealing portion (140) of a pouch-type secondary battery (100) is formed using a pouch sealing device (200) according to one embodiment of the present invention.

[0115] Referring to FIGS. 10 and 11, the sealing device (200) for a secondary battery of the present invention may further include a plurality of bending blocks (240). The bending blocks (240) may be arranged such that each of the upper protrusion (122a1) and the lower protrusion (122a2) is bent to overlap the general sealing portion (124). At this time, when the bending blocks (240) press the folding sealing portion (122), the folding sealing portion (122) may be heated so that thermal deformation may occur. For this purpose, the bending blocks (240) may be provided with a heating member (not shown), such as a separate heater. The plurality of bending blocks (240) may include an upper bending block (240) and a lower bending block (240). The bending block (240) positioned relatively higher can press the upper protrusion (122a1) in the positive direction of the X-axis. The bending block (240) positioned relatively lower can press the lower protrusion (122a2) in the positive direction of the X-axis.

[0116] In addition, the secondary battery sealing device (200) of the present invention may further include a bending moving unit (250) provided to move a plurality of bending blocks (240). For example, the bending moving unit (250) may be provided with a plurality of bending moving units (not shown) provided to move each of the plurality of bending blocks (240). The bending moving unit may be, for example, a servo cylinder provided with a servo motor. The control unit (280) may control the operation of the bending moving unit (250) so that the bending blocks (240) can press the folding sealing unit (122).

[0117] FIG. 12 is a cross-sectional view schematically showing a process of forming a side sealing portion (126) of a pouch-type secondary battery (100) using a pouch sealing device (200) according to one embodiment of the present invention.

[0118] Referring to FIG. 12, the pouch sealing device (200) of the present invention may include a plurality of side sealing blocks (260) provided to form a side sealing portion (126). For example, the plurality of side sealing blocks (260) may be connected to a heating portion (210) to conduct heat. The plurality of side sealing blocks (260) may pressurize a portion of the pouch (110) corresponding to a side of the electrode assembly (120) where the electrode lead (151) is not positioned by the block moving portion (230) in a heated state.

[0119] For example, as shown in FIG. 12, the plurality of side sealing blocks (260) may include a side upper block (261) and a side lower block (262). The side sealing portion (126) may be formed by pressing both ends of the pouch film (111) downward while the side upper block is heated, and by pressing both ends of the pouch film (111) upward while the side lower block is heated. To this end, the pouch sealing device (200) of the present invention may further include a side moving portion (270) provided to raise and lower each of the side upper block and the side lower block. For example, the side moving portion (270) may include a plurality of side moving units. The side moving unit may be, for example, a servo cylinder equipped with a servo motor. The control unit (280) can control the operation of the side moving unit (270) so that the side sealing block (260) can press both ends of the pouch film (111).

[0120] Figure 13 is a flowchart showing a method for sealing a pouch-type secondary battery (100) according to one embodiment of the present invention.

[0121] According to the present embodiment, a method for manufacturing a pouch-type secondary battery is provided, and in particular, a method for sealing a pouch is provided.

[0122] The pouch sealing step includes a top sealing step and a side sealing step, and may include a step of pre-assembling the pouch and electrode assembly before performing these sealing steps.

[0123] For example, if a cup receiving portion or forming portion into which an electrode assembly is inserted is formed in the pouch film, a step of inserting the electrode assembly into the forming portion may be included. If the forming portion is not formed, the pouch film may be folded to cover the lower, rear, and upper surfaces of the electrode assembly. Folding may be performed at the rear position of the electrode assembly.

[0124] Here, the sealing performed on one side and the other side of the electrode assembly, that is, on both sides, can be called the top sealing step, and the sealing performed on the front of the electrode assembly can be called the side sealing step.

[0125] According to one embodiment of the present invention, a top sealing step and a manufacturing method including the same, which are performed particularly when a forming process is omitted and the thickness of the electrode assembly is relatively large, can be provided.

[0126] Referring again to FIG. 13 together with FIG. 6 to FIG. 12, a sealing method according to an embodiment of the present invention is a method of sealing a pouch (110) provided with an electrode assembly (120) having an electrode lead (151) by folding a middle portion (M) of a pouch film (111) so that both ends meet each other. The sealing method of the present invention is a method of sealing a pouch-type secondary battery (100) using a sealing device (200) for a secondary battery including a heating unit (210), a plurality of sealing blocks (220), and a block moving unit (230).

[0127] Specifically, the sealing method of the present invention includes a heating step (M01). In the heating step (M01), the heating unit (210) heats the plurality of sealing blocks (220) to a temperature at which the plurality of sealing blocks (220) can be thermally fused when the plurality of sealing blocks (220) press the sealing area of ​​the pouch (110).

[0128] In addition, the sealing method of the present invention includes a moving step (M02). The moving step (M02) is a step in which a block moving unit (230) moves a plurality of sealing blocks (220) so that the sealing area of ​​the pouch (110) is pressed while the plurality of sealing blocks (220) are heated.

[0129] In addition, the sealing method of the present invention includes a pressurizing step (M02). The pressurizing step (M02) is a step in which a plurality of sealing blocks (220) pressurize and seal the edge of the pouch (110), and at least one of a one-side sealing portion (140) and an other-side sealing portion (140) in which an electrode lead (151) is interposed between the upper portion (111a) and the lower portion (111b) of the folded pouch film (111) is formed. In the pressurizing step (M02), the plurality of sealing blocks (220) can seal the pouch film (111) so that a folding sealing portion (122) having a folded shape such that a part of the upper portion (111a) or the lower portion (111b) of the pouch film (111) overlaps at least one of the one-side sealing portion (140) and the other-side sealing portion (140) is provided while the plurality of sealing blocks (220) are heated.

[0130] Accordingly, the sealing method of the present invention can provide a pouch-type secondary battery (100) that can effectively reduce empty spaces on one side and the other side of the electrode assembly (120) that are not filled with internal components by having at least one of the one-side sealing portion (140) and the other-side sealing portion (140) include a folding sealing portion (122). Accordingly, the pouch-type secondary battery (100) manufactured by the sealing method of the present invention can have a more compact shape, thereby effectively increasing the energy density of the secondary battery.

[0131] The preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art having ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims.

[0132] As described in the detailed description of the invention.

Claims

1. An electrode assembly having an electrode lead on at least one of one side and the other side; and A pouch having a middle portion of the pouch film folded to cover the upper surface, lower surface, and rear surface of the electrode assembly and enclosing the electrode assembly, and having a sealing portion formed by heat-melting the edge portions located on the front, one side, and the other side of the electrode assembly; The above sealing portion is located on each of one side and the other side of the electrode assembly and includes a folding sealing portion in which a portion of the pouch film is folded and heat-sealed. A pouch-type secondary battery, wherein the folding sealing portion includes a front folding sealing portion formed close to the front side of the electrode assembly and a rear folding sealing portion formed close to the other side of the electrode assembly.

2. In paragraph 1, A pouch-type secondary battery characterized in that forming processing of a pouch for insertion of the electrode assembly is excluded.

3. In paragraph 1, A pouch-type secondary battery characterized in that the forming depth is formed to be less than 0.5 times the thickness of the electrode assembly by forming the pouch for insertion of the electrode assembly.

4. In paragraph 1, A pouch-type secondary battery, characterized in that the sealing portion includes a general sealing portion formed by heat-melting the edge portion of the pouch film covering the upper surface of the electrode assembly and the edge portion of the pouch film covering the lower surface of the electrode assembly.

5. In paragraph 4, A pouch-type secondary battery characterized in that the general sealing portion is formed so as to be located on the front and both sides of the electrode assembly.

6. In paragraph 5, The above front folding sealing part is, A pouch-type secondary battery characterized by including an upper protrusion formed by folding back and forth the edge portion of a pouch film covering an upper surface of the electrode assembly, and a lower protrusion formed by folding back and forth the edge portion of a pouch film covering a lower surface of the electrode assembly.

7. In paragraph 6, A pouch-type secondary battery characterized in that the upper protrusion and the lower protrusion are positioned further forward than the electrode lead.

8. In paragraph 7, A pouch-type secondary battery characterized in that the general sealing portion is formed to cross the electrode lead back and forth, the front folding sealing portion is formed in front of the general sealing portion, and the rear folding sealing portion is formed in the rear of the general sealing portion.

9. In paragraph 8, A pouch-type secondary battery characterized in that the general sealing portion is formed in front of the front folding sealing portion.

10. In paragraph 9, A pouch-type secondary battery characterized in that the front folding sealing portion is folded so as to be covered vertically with the general sealing portion.

11. In paragraph 5, The above rear folding sealing part, A pouch-shaped secondary battery, characterized in that it includes a rear folding sealing portion that is folded and heat-sealed so that a portion of the folded middle portion of the pouch film overlaps.

12. In paragraph 5, The above rear folding sealing part, A first branch portion formed between the edge portion of the pouch film covering the rear surface of the electrode assembly and the edge portion of the pouch film covering the upper surface of the electrode assembly; and A pouch-type secondary battery characterized by including a second branch portion formed between the edge portion of the pouch film covering the rear surface of the electrode assembly and the edge portion of the pouch film covering the lower surface of the electrode assembly.

13. In paragraph 12, A pouch-type secondary battery characterized in that the rear folding sealing portion is folded so as to be covered vertically with the general sealing portion.

14. A method for manufacturing a pouch-type secondary battery by sealing an electrode assembly having an electrode lead on at least one of one side and the other side and a pouch film covering the electrode assembly, The above-mentioned top sealing step comprises a top sealing step in which the middle part of the above-mentioned pouch film is folded to cover the upper surface, lower surface, and rear surface of the above-mentioned electrode assembly, and the edge parts located on each of one side and the other side of the above-mentioned electrode assembly are heat-fused to form a sealing part. The above sealing portion includes a folding sealing portion in which a portion of the pouch film is folded and heat-sealed, A method for manufacturing a pouch-type secondary battery, wherein the folding sealing portion includes a front folding sealing portion formed close to the front side of the electrode assembly and a rear folding sealing portion formed close to the other side of the electrode assembly.

15. In paragraph 14, The above top sealing step is, A heating step for heating a plurality of sealing blocks through a heating unit; A moving step in which the plurality of sealing blocks are moved to the pressurized position of the pouch film in a heated state through a block moving part; and A method for manufacturing a pouch-type secondary battery, characterized in that it includes a pressing step in which the plurality of sealing blocks press the pouch film to form the sealing portion.

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