Secondary battery manufacturing method and secondary battery manufacturing apparatus used therefor

Abstract

The present invention relates to a method for manufacturing a secondary battery and a secondary battery manufacturing apparatus used therein, and more specifically, to a method for manufacturing a pouch-type secondary battery and a secondary battery manufacturing apparatus used therein. The present invention relates to a method for manufacturing a secondary battery comprising a battery case having a storage portion for housing an electrode assembly and a rim portion extending along the rim of the storage portion, wherein A method for manufacturing a secondary battery comprises: a gas discharge step for discharging gas inside the battery case to the outside; a pressurizing step for pressurizing a part of the rim portion to form a pressurized area; and a first sealing step for heat-sealing a part of the rim portion to form a first sealing area; wherein the pressurized area is provided between the storage portion and the first sealing area. The present invention provides a secondary battery manufacturing apparatus comprising: a main body; and a pressure press movably provided from the main body and forming a pressure area by pressing a part of the rim portion.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a secondary battery and a secondary battery manufacturing apparatus used therein, and more specifically, to a method for manufacturing a pouch-type secondary battery and a secondary battery manufacturing apparatus used therein. Background Technology

[0002] Unlike primary batteries, secondary batteries are rechargeable and are currently the subject of extensive research and development due to their potential for miniaturization and high capacity. As technological development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rising rapidly.

[0003] Secondary batteries are classified into coin-type, cylindrical, prismatic, and pouch-type batteries according to the shape of the battery case. In secondary batteries, the electrode assembly mounted inside the battery case is a power generation device capable of charging and discharging, consisting of a laminated structure of electrodes and separators.

[0004] Electrode assemblies can be roughly classified into a jelly roll type, which is wound with a separator interposed between a sheet-type positive electrode and a negative electrode coated with an active material; a stack type, which is sequentially stacked with a plurality of positive and negative electrodes interposed with a separator; and a stack / folding type, which is wound with stack-type unit cells into a long separating film.

[0005] Recently, pouch-type rechargeable batteries with a structure in which a stacked or stacked / folded electrode assembly is embedded in a battery case made of aluminum laminate sheets are attracting a lot of attention due to reasons such as low manufacturing costs, small weight, and easy shape deformation, and their usage is gradually increasing.

[0006] The above-mentioned pouch-type secondary battery is manufactured through an assembly process in which an electrode assembly is housed together with an electrolyte inside a battery case; a degas process in which gas inside the battery case is discharged to the outside; and a sealing process in which the battery case is sealed.

[0007] However, after the aforementioned degassing process, the outer surface of the battery case may become uneven due to gas flow inside the case. If the battery case is sealed in this state, wrinkles may form in and around the sealing area. Such wrinkles pose a critical problem, causing defects in appearance and insulation resistance. The problem to be solved

[0008] The present invention has been devised to solve the above-mentioned problems, and the objective of the present invention is to provide a method for manufacturing a secondary battery and a secondary battery manufacturing apparatus used therein, which can minimize the occurrence of wrinkles on the outer surface of the battery case of a secondary battery manufactured by a degassing process and a sealing process. means of solving the problem

[0009] The present invention provides a method for manufacturing a secondary battery comprising a battery case having a storage portion for housing an electrode assembly and a rim portion extending along the rim of the storage portion, the method comprising: a gas discharge step for discharging gas inside the battery case to the outside; a pressurizing step for pressurizing a portion of the rim portion to form a pressurized area; and a first sealing step for heat-sealing a portion of the rim portion to form a first sealing area; wherein the pressurized area is provided between the storage portion and the first sealing area.

[0010] In addition, the method for manufacturing a secondary battery according to the present invention further includes a second sealing step after the first sealing step, wherein a portion of the edge portion is heat-sealed to form a second sealing region; and the second sealing region may be formed corresponding to the position of the pressure region.

[0011] The above pressurization step can form the pressurized area by performing pressurization along the longitudinal direction of the battery case.

[0012] The first sealing step above can form a first sealing area by performing sealing parallel to the pressurized area.

[0013] Meanwhile, the method for manufacturing a secondary battery according to the present invention further includes a through-hole forming step of forming a through-hole on the rim portion prior to the gas discharge step; the gas discharge step can discharge gas inside the battery case to the outside through the through-hole.

[0014] The first sealing area can be provided between the through hole and the pressure area.

[0015] In addition, the secondary battery manufacturing method according to the present invention may further include a battery case fixing step between the pressurizing step and the first sealing step, wherein a piercing member is inserted into the through hole to fix the position of the battery case.

[0016] In addition, the method for manufacturing a secondary battery according to the present invention may further include a vacuum forming step for forming a vacuum around the battery case prior to the through-hole forming step.

[0017] In addition, the method for manufacturing a secondary battery according to the present invention may further include a vacuum release step for releasing the vacuum state around the battery case after the first sealing step.

[0018] The above gas discharge step can discharge gas inside the battery case to the outside by pressurizing the storage portion in the thickness direction of the battery case.

[0019] Meanwhile, the present invention provides a secondary battery manufacturing apparatus for manufacturing a secondary battery comprising a battery case having a storage portion for housing an electrode assembly and a rim portion extending along the rim of the storage portion, the apparatus comprising: a main body; a pressure press movably provided from the main body and forming a pressure area by pressing a portion of the rim portion; and a sealing member movably provided from the main body and forming a first sealing area by heat-sealing a portion of the rim portion; wherein the pressure area is provided between the storage portion and the first sealing area.

[0020] In addition, the secondary battery manufacturing device according to the present invention further includes a gas discharge press that is movably provided from the main body and discharges gas by pressurizing the storage portion; the pressurizing press may be disposed between the gas discharge press and the sealing member.

[0021] In addition, the secondary battery manufacturing device according to the present invention may further include a piercing member that is movably provided from the main body and forms a through hole on the rim portion. Effects of the invention

[0022] The present invention has the advantage of minimizing problems such as defects in appearance and insulation resistance caused by wrinkles in the battery case by forming a pressure area between the storage portion and the first sealing area on the edge portion of the battery case.

[0023] In addition, the present invention has the advantage of preventing insulation resistance failure by minimizing wrinkles in the second sealing area by forming a pressure area between the storage area and the first sealing area on the edge of the battery case and then forming a second sealing area corresponding to the position of the pressure area.

[0024] In addition, the present invention has the advantage of improving sealing quality by preventing insulation resistance defects caused by electrolytes through the formation of a second sealing region corresponding to the position of the pressurized region, thereby minimizing the electrolyte in the internal region of the battery case corresponding to the second sealing region. Brief explanation of the drawing

[0025] FIG. 1 is a flowchart showing the flow of a secondary battery manufacturing method according to Example 1 of the present invention. FIG. 2 is a front view showing the appearance of a secondary battery manufactured according to the secondary battery manufacturing method of FIG. 1. FIG. 3 is a conceptual diagram showing the appearance of a secondary battery manufacturing apparatus according to Example 2 of the present invention. Specific details for implementing the invention

[0026] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0027] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0028] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0029] secondary battery manufacturing method

[0030] The present invention provides a method for manufacturing a secondary battery comprising a battery case (12) having a storage portion (12a) in which an electrode assembly (11) is housed as shown in FIG. 1 and a rim portion (12b) formed extending along the rim of the storage portion (12a), wherein the method comprises: a gas discharge step (S30) for discharging gas inside the battery case (12) to the outside; a pressurizing step (S40) for pressurizing a part of the rim portion (12b) to form a pressurized area (P); and a first sealing step (S60) for heat-sealing a part of the rim portion (12b) to form a first sealing area (A1).

[0031] First, the secondary battery (10) described above may include an electrode assembly (11) and a battery case (10) that accommodates the electrode assembly (11).

[0032] At this time, the electrode assembly (11) may be configured such that the positive and negative electrodes and the separator are alternately arranged. Specifically, the electrode assembly (11) may be stacked in the order of positive current collector / positive active material layer / separator / negative active material layer / negative current collector, and may have a structure in which the positive active material layer on one side of the separator faces the negative active material layer on the other side. Also, note that in FIG. 2, the electrode assembly (11) is configured to be housed inside the battery case (12) and is indicated by a dotted line.

[0033] And the battery case (12) is configured to have a storage portion (12a) in which an electrode assembly (11) is stored and a rim portion (12b) formed extending along the rim of the storage portion (12a), and various configurations are possible.

[0034] Here, the storage portion (12a) is a region formed concavely on the battery case (12) to accommodate the electrode assembly (11) described above, and has an empty space, and can accommodate an electrolyte, etc. together with the electrode assembly (11) described above.

[0035] And the above-mentioned edge portion (12b) may be an area that extends along the edge of the storage portion (12a) on the battery case (12). This edge portion (12b) may have a sealed structure to prevent the electrode assembly (11) stored in the storage portion (12a) from being damaged by exposure to external moisture and air. For example, as shown in FIG. 2, an edge sealing area (A3) may be formed on the edge portion (12b) that is heat-sealed and sealed along the outer periphery of the edge portion (12b).

[0036] Meanwhile, in a secondary battery (10) of such a structure, the electrolyte and the electrode assembly (11) react inside the battery case (12) to generate gas, and a gas discharge step (S30) for discharging the gas is performed.

[0037] Specifically, the gas discharge step (S30) is a step of discharging gas inside the battery case (12) to the outside, and can be performed in various ways.

[0038] For example, the gas discharge step (S30) can discharge gas inside the battery case (12) to the outside by pressurizing the storage portion (12a) in the thickness direction of the battery case (12) (a direction perpendicular to the XY plane based on FIG. 2).

[0039] However, the gas discharge method of the above gas discharge step (S30) is not limited to the above content, and it is also possible to discharge the gas inside the battery case (12) to the outside by forming a vacuum around the battery case (12).

[0040] Meanwhile, after the gas discharge step (S30) is performed, a pressurization step (S40) for pressurizing a part of the rim portion (12b) may be performed.

[0041] Specifically, the above pressurization step (S40) can form a pressurized area (P) by pressurizing a part of the battery case (12) that has become uneven due to gas flow occurring inside the battery case (12) using a pressurizing press (130) or the like.

[0042] The above-mentioned pressure step (S40) allows a part of the edge portion (12b), i.e., the pressure area (P), to be kept flat to a certain level or higher, thereby minimizing wrinkles, and thus, even when sealing is performed on the pressure area (P) in the second sealing step (S80) to be described later, a sealing quality of a certain level or higher can be secured.

[0043] In addition, the above-mentioned pressurizing step (S40) pressurizes a part of the edge portion (12b) to form a pressurized area (P), thereby allowing the electrolyte provided inside the battery case (12) to be moved to a position not corresponding to the pressurized area (P). In this case, the electrolyte can be provided in a relatively small amount at a position corresponding to the pressurized area (P), and thus, when sealing is performed in the second sealing step (S80) to be described later in the pressurized area (P), insulation resistance defects caused by the electrolyte can be minimized.

[0044] These pressure areas (P) can be formed in various ways on the edge portion (12b).

[0045] However, considering that an improved sealing quality can be secured when the above-mentioned pressure area (P) is sealed in the second sealing step (S80) described later, it may be preferable for the above-mentioned pressure area (P) to be positioned closer to the storage portion (12a) than to the first sealing area (A1) that is cut from the finished product. With this in mind, the above-mentioned pressure area (P) may be positioned between the storage portion (12a) and the first sealing area (A1) described later, as shown in FIG. 2.

[0046] In this case, the pressure area (P) may be formed along the longitudinal direction (X direction based on FIG. 2) of the battery case (12). At this time, it is preferable that the pressure area (P) be formed continuously as shown in FIG. 2, but it is also possible that it be formed discontinuously.

[0047] And the above-mentioned pressurization step (S40) can be performed at various temperatures. However, considering that the above-mentioned pressurization step (S40) is a step of flattening a part of the edge portion (12b) so that it does not wrinkle, rather than performing sealing on a part of the edge portion (12b), it may be preferable for the above-mentioned pressurization step (S40) to be performed at room temperature.

[0048] Here, the above-mentioned room temperature refers to the temperature range referred to as 'room temperature' or ambient temperature in the industry. That is, it refers to the temperature of laboratories, research rooms, etc., and specifically refers to the indoor ambient temperature as an expression of temperature conditions used when experiments are conducted without specifying or controlling the temperature, or when samples and materials are left indoors. Generally, it is a temperature at which humans can stay comfortably, usually around 15°C to 20°C.

[0049] Meanwhile, after the above-mentioned pressurization step (S40), a first sealing step (S60) may be performed to heat-fuse and seal a part of the edge portion (12b).

[0050] Specifically, the first sealing step (S60) may form a first sealing area (A1) on the edge portion (12b) by heat-sealing a part of the edge portion (12b) using a sealing member (140), etc. Here, the first sealing area (A1) can be understood as an area that fixes the sealing position of the battery case (12) and roughly guides the formation position of the second sealing area (A2) prior to the formation of the second sealing area (A2).

[0051] Here, the first sealing area (A1) can be formed in various ways on the edge portion (12b). For example, the first sealing area (A1) can be formed parallel to the pressure area (P) described above. In this case, if the pressure area (P) is formed along the longitudinal direction (X direction based on FIG. 2) of the battery case (12), the first sealing area (A1) can also be formed along the longitudinal direction (X direction based on FIG. 2) of the battery case (12). Furthermore, while it is preferable for the first sealing area (A1) to be formed continuously as shown in FIG. 2, it is of course possible for it to be formed discontinuously.

[0052] And the first sealing step (S60) can be performed at various temperatures. Here, considering that the sealing step is a step of sealing a part of the edge portion (12b), it may be preferable for the first sealing step (S60) to be performed at a temperature above room temperature. Here, room temperature is a temperature range referred to as 'room temperature' or ambient temperature in the industry as previously mentioned, and is usually around 15℃ to 20℃.

[0053] Thus, the temperature above room temperature may be 20°C or higher, and, for example, if the battery case (12) includes a polypropylene sheet, it may be set to 160°C to 190°C.

[0054] Meanwhile, after the first sealing step (S60), a second sealing step (S80) for heat-sealing a part of the edge portion (12b) may be performed.

[0055] Specifically, the second sealing step (S80) can seal the battery case (12) by forming a second sealing area (A2) by heat-sealing a part of the edge portion (12b) using a sealing member, etc.

[0056] Here, the second sealing area (A2) is formed corresponding to the location of the pressurized area (P).

[0057] That is, the second sealing area (A2) may be formed overlapping the location where the pressure area (P) is formed. Accordingly, FIG. 2 indicates that the second sealing area (A2) and the pressure area (P) point to the same location, but it should be noted that this means the second sealing area (A2) and the pressure area (P) are formed overlapping. In this case, the second sealing area (A2) may have the same area as the pressure area (P), or it may have an area smaller or larger than the pressure area (P).

[0058] In this second sealing step (S80), by forming a second sealing area (A2) in the pressurized area (P), improved sealing quality can be secured by minimizing wrinkles and insulation resistance defects in the second sealing area (A2).

[0059] Meanwhile, since the above-mentioned second sealing area (A2) is formed in correspondence with the above-mentioned pressure area (P), if the above-mentioned pressure area (P) is formed along the length direction (X direction based on FIG. 2) of the battery case (12), the above-mentioned second sealing area (A2) can also be formed along the length direction (X direction based on FIG. 2) of the battery case (12).

[0060] And the second sealing step (S80) can be performed at various temperatures. Considering that the sealing step is a step of sealing a part of the edge portion (12b), it may be preferable for the second sealing step (S80) to be performed at a temperature above room temperature. Here, room temperature is a temperature range referred to as 'room temperature' or ambient temperature in the industry as previously mentioned, and is usually around 15℃ to 20℃.

[0061] Thus, the temperature above room temperature may be 20°C or higher, and, for example, if the battery case (12) includes a polypropylene sheet, it may be set to 160°C to 190°C.

[0062] Meanwhile, the present invention may further include a through-hole forming step (S20) for forming a through-hole (h) on the rim portion (12b) prior to the aforementioned gas discharge step (S30). In this case, the gas inside the battery case (12) can be discharged to the outside through the through-hole (h) in the aforementioned gas discharge step (S30).

[0063] Specifically, the through-hole forming step (S20) may form a through-hole (h) on the rim portion (12b) using a piercing member, etc. At this time, the piercing member (150), etc. may form the through-hole (h) by moving up and down toward the battery case (12) at a position corresponding to the rim portion (12b) and piercing the battery case (12).

[0064] The above-mentioned through hole (h) may be formed at various locations on the rim portion (12b). However, considering that the electrode assembly (11) in the finished product must have a sealed structure, it may be preferable for the through hole (h) to be formed at a location relatively far from the storage portion (12a).

[0065] In this case, the through hole (h) may be located between the aforementioned edge sealing area (A3) and the first sealing area (A1) on the edge portion (12b), as shown in FIG. 2. Here, the first sealing area (A1) may be provided between the through hole (h) and the pressure area (P).

[0066] Meanwhile, the present invention may further include a battery case (12) fixing step (S50) in which a piercing member (150) is inserted into the through hole (h) between the pressurization step (S40) and the first sealing step (S60) to fix the position of the battery case (12).

[0067] Specifically, the battery case (12) fixing step (S50) can fix the position of the battery case (12) by moving the piercing member (150) toward the battery case (12) at a position corresponding to the through hole (h) and inserting it into the through hole (h).

[0068] And with the piercing member (150) inserted into the through hole (h) and the position of the battery case (12) fixed, at least one of the aforementioned first sealing step (S60), the vacuum release step (S70) and the second sealing step (S80) to be described later can be performed.

[0069] Meanwhile, the present invention may further include a vacuum forming step (S10) for forming a vacuum around the battery case (12) prior to the aforementioned through-hole forming step (S20). In this case, the battery case (12) may be housed in a vacuum chamber (not shown) that forms a vacuum atmosphere inside.

[0070] In addition, the present invention may further include a vacuum release step (S70) for releasing the vacuum state around the battery case (12) after the aforementioned first sealing step (S60). In this case, the vacuum release step (S70) may be performed by releasing the internal vacuum atmosphere in the vacuum chamber housing the battery case (12).

[0071] And the vacuum release step (S70) may be performed after the first sealing step (S60) described above, and more specifically, may be performed between the first sealing step (S60) and the second sealing step (S80).

[0072] secondary battery manufacturing device

[0073] Meanwhile, the present invention provides a secondary battery manufacturing apparatus (100) for manufacturing a secondary battery (10) comprising a battery case (12) having a storage portion (12a) in which an electrode assembly (11) is stored and a rim portion (12b) extending along the rim of the storage portion (12a), the apparatus comprising: a main body (110); a pressure press (130) movably provided from the main body (110) and forming a pressure area (P) by pressing a part of the rim portion (12b); and a sealing member (140) movably provided from the main body (110) and forming a first sealing area (A1) by heat-sealing a part of the rim portion (12b).

[0074] Here, the main body (110) is configured such that at least one of the pressure press (130) and the sealing member (140) is movably connected, and various configurations are possible. At this time, the main body (110) may include a linear motor, a hydraulic cylinder, etc., to enable at least one of the pressure press (130) and the sealing member (140) to move.

[0075] Meanwhile, the pressure press (130) is configured to be movably provided from the main body (110) and to press a part of the rim portion (12b) to form a pressure area (P), and various configurations are possible.

[0076] As described above, when the pressure area (P) is provided between the storage portion (12a) and the first sealing area (A1), the pressure press (130) may be positioned between the gas discharge press (120) and the sealing member (140) to be described later. Furthermore, specific details regarding the pressure area (P) and the first sealing area (A1) may be substituted with the description above.

[0077] Additionally, the pressure press (130) may be equipped with one or more heating members (not shown). In this case, the pressure press (130) may form the second sealing area (A2) by maintaining a room temperature state when forming the pressure area (P) and maintaining a temperature above room temperature when forming the second sealing area (A2) to press a location corresponding to the pressure area (P).

[0078] Meanwhile, the sealing member (140) is configured to be movably provided from the main body (110) and to heat-seal a part of the edge portion (12b) to form a first sealing area (A1), and various configurations are possible.

[0079] In this case, the sealing member (140) can heat the first sealing area (A1) to a temperature above room temperature and simultaneously apply pressure, and may further include a heating member for this purpose. Here, the temperature above room temperature may be a temperature of 20°C or higher, and, for example, if the battery case (12) includes a polypropylene sheet, it may be set to 160°C to 190°C.

[0080] Meanwhile, the present invention may further include a gas discharge press (120) that discharges gas by pressurizing the storage portion (12a).

[0081] Specifically, the gas discharge press (120) is configured to be movably provided from the main body (110) and to discharge gas by pressurizing the storage portion (12a), and various configurations are possible.

[0082] The above-described gas discharge press (120) can discharge gas inside the battery case (12) to the outside by moving the storage portion (12a) so that it is pressed in the thickness direction (Z direction based on FIG. 3), as shown in FIG. 3.

[0083] Meanwhile, the present invention may further include a piercing member (150) that is movably provided from the main body (110) and forms a through hole (h) on the rim portion (12b).

[0084] Specifically, the piercing member (150) can form the through hole (h) by moving up and down toward the battery case (12) at a position corresponding to the rim portion (12b) and piercing the battery case (12). Here, more detailed information regarding the through hole (h) can be substituted with the above description.

[0085] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0086] S10: Vacuum formation step S20: Through hole formation step S30: Gas discharge stage S40: Pressurization stage S50: Battery case fixing step S60: 1st sealing step S70: Vacuum release step S80: Second sealing stage 10: Secondary battery 11: Electrode assembly 12: Battery case 12a: Storage compartment 12b: Border A1: First sealing area A2: Second sealing area A3: Edge sealing area P: Pressurized area h: through hole 100: Secondary battery manufacturing device 110: Main unit 120: Gas release press 130: Pressure Press 140: Sealing member 150: Absence of piercing

Claims

Claim 1 A method for manufacturing a secondary battery comprising a battery case having a storage portion for housing an electrode assembly and a rim portion extending along the rim of the storage portion, the method comprising: a gas discharge step for discharging gas inside the battery case to the outside; a pressurizing step for pressurizing a portion of the rim portion to form a pressurized area; and a first sealing step for heat-sealing a portion of the rim portion to form a first sealing area, wherein the pressurizing area is provided between the storage portion and the first sealing area, and the pressurizing area and the first sealing area are formed spaced apart from each other. Claim 2 A method for manufacturing a secondary battery according to claim 1, further comprising, after the first sealing step, a second sealing step of heat-sealing a portion of the edge portion to form a second sealing region; wherein the second sealing region is formed corresponding to the position of the pressurized region. Claim 3 A method for manufacturing a secondary battery according to claim 1, wherein the pressurizing step involves performing pressurization along the longitudinal direction of the battery case to form the pressurized area. Claim 4 A method for manufacturing a secondary battery according to claim 3, wherein the first sealing step forms a first sealing region by performing sealing parallel to the pressurized region. Claim 5 A method for manufacturing a secondary battery according to claim 1, further comprising a through-hole forming step of forming a through-hole on the rim portion prior to the gas discharge step; wherein the gas discharge step discharges gas inside the battery case to the outside through the through-hole. Claim 6 A method for manufacturing a secondary battery according to claim 5, wherein the first sealing region is provided between the through hole and the pressurized region. Claim 7 A method for manufacturing a secondary battery according to claim 5, further comprising a battery case fixing step between the pressurizing step and the first sealing step, wherein a piercing member is inserted into the through hole to fix the position of the battery case. Claim 8 A method for manufacturing a secondary battery according to claim 5, further comprising a vacuum forming step of forming a vacuum around the battery case prior to the through-hole forming step. Claim 9 A method for manufacturing a secondary battery according to claim 8, further comprising a vacuum release step for releasing the vacuum state around the battery case after the first sealing step. Claim 10 A method for manufacturing a secondary battery according to claim 1, wherein the gas discharge step discharges gas inside the battery case to the outside by pressurizing the storage portion in the thickness direction of the battery case. Claim 11 A secondary battery manufacturing apparatus for manufacturing a secondary battery comprising a battery case having a storage portion for housing an electrode assembly and a rim portion extending along the rim of the storage portion, the apparatus comprising: a main body; a pressure press movably provided from the main body and forming a pressure area by pressing a portion of the rim portion; and a sealing member movably provided from the main body and forming a first sealing area by heat-sealing a portion of the rim portion, wherein the pressure area is provided between the storage portion and the first sealing area, and the pressure area and the first sealing area are formed spaced apart from each other. Claim 12 The secondary battery manufacturing apparatus of claim 11 further comprises a gas discharge press movably provided from the main body and pressurizing the storage portion to discharge gas; the pressurizing press is disposed between the gas discharge press and the sealing member. Claim 13 A secondary battery manufacturing apparatus according to claim 11, further comprising a piercing member movably provided from the main body and forming a through hole on the rim portion.

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