Bag-shaped battery case forming apparatus including volatile lubricant supply unit and bag-shaped battery case manufacturing method using the same

Abstract

The present invention relates to a pouch cell case forming apparatus including a volatile lubricant supply unit and a pouch cell case manufacturing method using the same, and more particularly, to a pouch cell case forming apparatus including a punch configured to form a laminate sheet used as a pouch cell case into a cuboid, wherein the pouch cell case forming apparatus further includes a volatile lubricant supply unit configured to supply a volatile lubricant for minimizing damage to a surface of the laminate sheet between the laminate sheet and the punch, and a pouch cell case manufacturing method using the same.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 2020-0124896, filed on September 25, 2020, the entire disclosure of which is incorporated herein by reference.

[0002] This invention relates to a pouch battery casing forming apparatus including a volatile lubricant supply unit and a method for manufacturing a pouch battery casing using the apparatus. More specifically, the invention relates to a pouch battery casing forming apparatus and a method for manufacturing a pouch battery casing using the apparatus, the pouch battery casing forming apparatus including a punch configured to form a laminate used as a pouch battery casing into a cuboid, wherein the pouch battery casing forming apparatus further includes a volatile lubricant supply unit configured to supply a volatile lubricant between the laminate and the punch to minimize surface damage to the laminate. Background Technology

[0003] The demand for secondary batteries as energy sources for mobile devices and electric vehicles is increasing rapidly. In particular, the demand for lithium secondary batteries with high energy density and discharge voltage is very high.

[0004] Lithium-ion rechargeable batteries can be categorized by shape into cylindrical, prismatic, or pouch-shaped batteries. Pouch-shaped batteries offer advantages such as high integration through stacking, high energy density per unit weight, low cost, and flexibility. They utilize laminated sheets as the battery casing and are configured with electrode assemblies and electrolyte housed within receptacles formed within the laminated sheets.

[0005] With the flexible laminate in a fixed state, the housing of the pouch battery is formed by pressing the flexible laminate using a punch for deep drawing. During the deep drawing process, due to the limitation of the laminate's flexibility and the frictional force applied when pressing with the punch, external defects such as pinholes or cracks are formed on the outer surface of the laminate.

[0006] Even with drastically reduced surface roughness of the punch contacting the laminate, frictional forces still arise due to continuous processing, leading to external defects. In particular, when the laminate is configured with a small thickness, its formability decreases, frequently resulting in external defects. For this reason, there are limitations to manufacturing high-capacity secondary batteries by reducing the thickness of the battery casing to increase the thickness of the electrode assembly.

[0007] Various attempts have been made to solve this problem. For example, adding a separate film to the laminate, or pressing the laminate two or more times.

[0008] Patent Document 1 relates to a warm processing method for stainless steel foil and a mold for warm processing, wherein an austenitic stainless steel foil having a thickness of 300 μm or less is arranged facing a punch, and the stainless steel foil is drawn while the annular region of the stainless steel foil in contact with the shoulder of the punch is kept at a temperature of 30°C or lower and the region of the stainless steel foil outside the annular region is kept at a temperature of 40°C to 100°C.

[0009] Patent Document 1 uses a heating method for deep drawing, but does not disclose whether a lubricant is used or a method for removing the lubricant. For pouch cells, the electrolyte is in direct contact with the laminate. Therefore, if lubricant remains on the surface of the laminate, the performance of the secondary battery will be adversely affected.

[0010] Furthermore, in Patent Document 1, stainless steel is processed. To improve the flexibility of the metal, the temperature is increased. However, the laminate according to the present invention has the problem that the temperature cannot be increased due to the resin layers attached to the inner and outer surfaces of the laminate.

[0011] Patent Document 2 relates to a method for forming a compacted body, comprising the following steps: preparing raw material powder; providing a pressing lubricant between the outer peripheral surface of a first punch and the inner peripheral surface of a mold, and in this state moving the first punch and the mold relative to each other to apply the pressing lubricant to the inner peripheral surface of the mold; filling a cavity with the raw material powder and pressing the raw material powder to form a compacted body, wherein, in the application step, the pressing lubricant is applied to the inner peripheral surface of the mold while discharging the pressing lubricant through a supply port formed in the first punch and collecting the discharged pressing lubricant through a discharge port formed in the first punch.

[0012] In Patent Document 2, the lubricant is supplied by a separate supply unit and collected by a separate collection unit. In Patent Document 2, the material to be processed is powder; therefore, in order to reduce the friction between powder particles that may occur during the pressing process, it is inevitable that a lubricant capable of remaining for a predetermined time is required, and a device for collecting the lubricant must be provided. The material to be pressed in Patent Document 2 is powder, which is very different in physical properties from the laminate used in this invention.

[0013] Patent Document 3 relates to a rolling tool, and more specifically to a rolling tool for machining the inner surface of a cylindrical gap in the transverse direction, particularly a rolling tool for smoothing surface rolling. The rolling tool disclosed in Patent Document 3 includes at least one rolling body disposed in a rotatable rolling tool, the rolling body being removed by the tool along the inner surface of the cylindrical gap in the transverse direction. In this case, at least one rolling body can be inserted into the gap of the rolling tool in the radial direction and can be placed under a fluid pressurized from the inside to the outside of the gap in the radial direction. In Patent Document 3, an aerosol is used as the fluid. The aerosol in Patent Document 3 is a fluid mixed with gas and is used in pneumatic bearings and lubricants. This aerosol-type lubricant is used in a specific technical field and is not related to the lamination forming equipment according to the present invention.

[0014] Patent Document 4 relates to a battery casing forming apparatus including a low-friction punch head, which is an apparatus for forming a battery casing including an electrode assembly receiving portion that accommodates electrode assemblies. The forming apparatus of Patent Document 4 includes: a mold having a recessed or penetrating open recess of a size corresponding to the electrode assembly receiving portion, a sheet substrate for manufacturing the battery casing disposed on the upper surface of the mold; a punch having a shape corresponding to the open recess, the punch being positioned above the open recess to perform deep drawing on the sheet substrate, the punch including a punch head configured to enter the open recess when moving downwards, the punch head being made of a low-friction coefficient material; and a holder configured to press against opposite ends of the sheet substrate, thereby securing the sheet substrate to the mold for deep drawing.

[0015] As mentioned earlier, even when the surface roughness is reduced to decrease friction when the material has high strength, heat is still generated during continuous processing, which can lead to external defects such as pinholes or cracks in the laminate. In Patent Document 4, friction is reduced, and the punch head is made of a resin such as polytetrafluoroethylene to prevent wrinkles and whitening at the corners of the receiving portion during deep drawing.

[0016] Laminated sheets have long been used as casings for pouch cells, but this technology is suitable for manufacturing pouch cells appropriate for past markets. No molding equipment or method for manufacturing pouch cell casings using such equipment has yet been proposed to provide high-capacity cells with low defect rates, based on recent changes in the market environment.

[0017] Korean Patent Application Publication No. 2015-0060797 (June 3, 2015), "Patent Document 1"

[0018] Korean Patent Application Publication No. 2014-0089377 (July 14, 2014), "Patent Document 2"

[0019] Korean Patent Application Publication No. 2016-0032280 (March 23, 2016), "Patent Document 3"

[0020] Korean Patent Application Publication No. 2018-0028194 (March 16, 2018), "Patent Document 4" Summary of the Invention

[0021] Technical issues

[0022] The present invention was made in view of the above problems. The object of the present invention is to provide a highly efficient pouch battery casing forming apparatus and a method for manufacturing pouch battery casings using the apparatus. This pouch battery casing forming apparatus is capable of:

[0023] 1) Minimize potential surface damage to the outer surface of the laminate;

[0024] 2) To prevent pinholes or cracks from forming during the compression molding of thin films;

[0025] 3) Without significantly altering conventional molding equipment and the methods of using it;

[0026] 4) Use conventional lamination methods as usual;

[0027] 5) Prevent residues from remaining after molding.

[0028] Technical solution

[0029] To achieve the above objectives, the present invention provides a pouch-shaped battery casing forming apparatus, comprising:

[0030] A die having a recessed or penetrating open recess of a size corresponding to an electrode assembly receiving portion, a sheet disposed on the upper surface of the die; a punch having a shape corresponding to the open recess, the punch being positioned above the open recess to perform deep drawing on the sheet, the punch including a punch head configured to enter the open recess when moving downwards; a holder configured to press opposite ends of the sheet to secure the sheet to the die for deep drawing; and a lubricant supply unit configured to supply lubricant to the upper surface of the sheet that abuts the punch head.

[0031] The pouch-shaped battery casing forming equipment may not have a separate lubricant collection unit configured to collect lubricant supplied to the upper surface of the sheet, and the lubricant supply unit may supply lubricant only to the drawn portion of the sheet.

[0032] The lubricant according to the invention can be a no-clean lubricant or a volatile lubricant, for example, a lubricant that evaporates due to heat generated during molding or at room temperature during storage after processing. The volatile lubricant according to the invention does not require a separate degreasing process. To improve volatility, a very small amount of oiling agent can be mixed in. The volatile lubricant according to the invention can be dried more quickly by blowing air or using hot air.

[0033] Lubricants are used in conventional metalworking. The outer layer of the laminate according to the invention is a resin layer. Problems arise when lubricants, especially volatile lubricants, are used in conventional metalworking. Due to their high volatility, volatile lubricants can exhibit properties similar to cleaning agents and can easily penetrate the resin layer, causing stains on the surface of the laminate. Products with stains are discarded as defective products.

[0034] Therefore, a lubricant that does not penetrate the resin layer must be used. However, in this case, the lubricant has low volatility, so a separate cleaning process is required after processing.

[0035] The present invention was made in view of the problems encountered when performing molding with such volatile lubricants, and provides a pouch-shaped battery casing molding apparatus configured such that the injection nozzle and punch are set very close to each other, the volatile lubricant is supplied immediately before molding, and the lubricant is removed by blowing or using hot air after molding.

[0036] As a result, defects such as blemishes can be resolved and damage such as pinholes or cracks that may occur during molding can be prevented.

[0037] In this invention, the sheet may include a laminate. Any laminate can be used, as long as it is suitable for use in a pouch cell.

[0038] For example, the laminate according to the invention can be configured to have a structure in which a first resin layer having thermal fusion properties, a metal layer having material barrier properties, and a second resin layer as an outer layer are stacked, or in which a resin layer having thermal fusion properties and a metal layer having material barrier properties are stacked.

[0039] The first resin layer, which has thermal fusion properties, can be made of a material with low hygroscopicity that neither expands nor is corroded by the electrolyte, such as a polyolefin resin.

[0040] A metal layer with material barrier properties, for example, can be made of aluminum or aluminum alloy, to increase the strength of the battery casing in addition to preventing the entry or leakage of foreign matter such as gas or moisture.

[0041] The second resin layer is a polymer resin layer that forms the outer layer of the battery casing. This second resin layer requires predetermined tensile strength and weather resistance to ensure excellent resistance to external environmental conditions. For example, the second resin layer can be made of polyethylene terephthalate (PET) or oriented nylon.

[0042] The portion of the punch head that abuts with the sheet may be made of at least a low-friction-coefficient material. The low-friction-coefficient material may be at least one selected from the group consisting of polyetheretherketone (PEEK), polyethylene terephthalate (PET), polyimide (PI), polyphenylene sulfide (PPS), polypropylene (PP), polyethylene (PE), and nylon.

[0043] The portion of the punch that engages with the sheet may include at least a temperature control unit configured to raise or lower the temperature. Raising the temperature increases the sheet's flexibility, and allows residual lubricant after deep drawing to sublimate or evaporate rapidly.

[0044] The lubricant supply unit may include an injection nozzle configured to spray lubricant in an aerosol state, and the injection nozzle may be fixed to the retainer.

[0045] Furthermore, the present invention provides a method for manufacturing a pouch battery casing using the pouch battery casing forming apparatus, the method comprising the following steps: (S1) placing the sheet between the mold and the punch; (S2) applying a lubricant to the portion of the sheet that abuts with the punch head; and (S3) using the punch to form the sheet into a battery casing.

[0046] Lubricant can be applied to both the surface of the punch head and the surface of the sheet simultaneously, and step (S2) can be performed using a method that sprays lubricant in an aerosol state. The injection nozzle fixed to the retainer can spray lubricant in an aerosol state.

[0047] The present invention provides a method for attaching a membrane component for forming to the upper surface of a laminate, forming a battery casing, and separating the membrane component for forming.

[0048] The membrane component for forming may include a base film and an adhesive layer formed on one surface of the base film, thereby being separably attached to a laminate. The base film may be a polymer resin film, a metal film, or a composite film thereof. The membrane component for forming may have a single-layer structure comprising a base film and an adhesive layer, or a multilayer structure wherein two or more base films and two or more adhesive layers are alternately stacked. The polymer resin film may include at least one selected from the group consisting of polyethylene terephthalate (PET), polyimide (PI), polyphenylene sulfide (PPS), polypropylene (PP), polyethylene (PE), and nylon. The membrane component for forming may have a quadrilateral shape capable of covering the dimensions of the portion to be formed by depth drawing when viewed in a plane.

[0049] In this invention, step (S3) may include the following steps: pressing the laminate with a punch to draw the laminate to a first depth; and further pressing the laminate drawn to the first depth so that the laminate is further drawn to a second depth equal to 105% to 200% of the first depth.

[0050] Generally, increasing the thickness of a laminate improves its formability. However, conversely, increasing the thickness decreases its formability. Therefore, it is difficult to reduce the thickness of the battery casing while ensuring the formability of the laminate.

[0051] In the battery casing manufacturing method according to the invention, deep drawing can be performed while a volatile lubricant is applied to the laminate and a film member for forming is further attached to the laminate. In this case, stress that is excessively concentrated on the drawn portion of the laminate can be dispersed, thereby minimizing external defects of the laminate and improving the formability of the laminate.

[0052] After the electrode assembly housing is formed, the membrane component can be separated from the laminate to form a housing with a smaller thickness. As a result, the number of electrode assemblies that can be housed in a single battery cell can be increased, thus providing a battery casing for a secondary battery with high energy density.

[0053] In deep drawing processes used to form laminates into battery casings, the entire laminate is not stretched uniformly; only specific areas are overstretched to form the receiving portion. For this reason, the heavily stretched portions of the laminate are subjected to considerable stress, which can lead to defects such as cracks or pinholes. In this invention, a volatile lubricant is applied to the stressed portions to reduce friction and prevent overstretching only in these areas.

[0054] In addition, to prevent excessive stretching only in the stressed portion, the following steps can be performed: pressing the laminate with a punch to stretch the laminate to a first depth; and further pressing the laminate stretched to the first depth, such that the laminate is further stretched to a second depth equal to 105% to 200% of the first depth. In this case, the first depth is preferably 2 mm to 10 mm.

[0055] Furthermore, the present invention can provide a laminate in a state where a membrane component is attached. Specifically, the laminate for deep drawing is used to manufacture a battery casing by forming a receiving portion configured to accommodate an electrode assembly through deep drawing. The laminate for deep drawing may be a stacked sheet comprising a first resin layer having thermal fusion properties, a metal layer having material barrier properties, and a second resin layer as an outer layer, or it may be a stacked sheet comprising a resin layer having thermal fusion properties and a metal layer having material barrier properties, and the membrane component for forming can be detachably attached to one surface or opposite two surfaces of the stacked sheet.

[0056] Laminates of various thicknesses can be used depending on the intended use or purpose of the battery casing. For example, a conventional battery casing manufactured using a sheet with a thickness of 200 μm can be manufactured using a sheet with improved formability and a smaller thickness. As a result, a battery casing with a housing that has a smaller thickness than a conventional battery casing can be provided.

[0057] Furthermore, the present invention can provide all possible combinations of the above-described solutions.

[0058] Beneficial effects

[0059] To address the aforementioned problems, the present invention provides a highly efficient pouch-shaped battery casing forming apparatus and a method for manufacturing pouch-shaped battery casings using the apparatus. This pouch-shaped battery casing forming apparatus is capable of:

[0060] 1) Minimize potential surface damage to the outer surface of the laminate;

[0061] 2) To prevent pinholes or cracks from forming during the compression molding of thin films;

[0062] 3) Without significantly altering conventional molding equipment and the methods of using it;

[0063] 4) Use conventional lamination methods as usual;

[0064] 5) Prevent residues from remaining after molding.

[0065] As is evident from the above description, in the battery casing manufacturing method according to the invention, deep drawing is performed while a volatile lubricant is applied to the laminate, thereby dispersing stress excessively concentrated on the drawn portion of the laminate, thus improving the formability of the laminate. After the receiving portion is formed, the volatile lubricant sublimates or evaporates, thereby providing a battery casing with minimized external defects and reduced thickness. Attached Figure Description

[0066] Figure 1 This is a plan view of a pouch-shaped battery casing forming apparatus according to an embodiment of the present invention.

[0067] Figures 2 to 5 This is a schematic diagram illustrating a series of steps in manufacturing a battery casing according to an embodiment of the present invention. Detailed Implementation

[0068] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement these preferred embodiments. However, in describing the working principle of the preferred embodiments of the present invention, detailed descriptions of known functions and structures incorporated herein may obscure the main points of the invention, and such descriptions will be omitted.

[0069] Furthermore, the same reference numerals will be used throughout the accompanying drawings to denote components performing similar functions or operations. Where, throughout the application, one component is referred to as being connected to another component, that one component may not only be directly connected to the other component, but also indirectly connected to the other component via another component. Moreover, including an element does not imply the exclusion of other elements, but rather the inclusion of further elements, unless otherwise stated.

[0070] Furthermore, unless otherwise specified, the description of elements by limitation or addition can be applied to all inventions and does not limit any particular invention.

[0071] Furthermore, in the specification of this invention and the claims of this application, unless otherwise stated, the singular form is intended to include the plural form.

[0072] Furthermore, in the specification of this invention and the claims of this application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" refers to three cases: including A, including B, and including both A and B.

[0073] Furthermore, unless the context explicitly indicates otherwise, all numerical ranges include the minimum value, the maximum value, and all intermediate values ​​in between.

[0074] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0075] Figure 1 This is a plan view of a pouch-shaped battery casing forming apparatus according to an embodiment of the present invention.

[0076] Reference Figure 1 The forming apparatus 100 according to an embodiment of the present invention is an apparatus for forming a laminate 1 to form a receiving portion configured to accommodate an electrode assembly, including a mold assembly 20 and a punch 30.

[0077] The mold assembly 20 is a structure for fixing the outer peripheral portion of the laminate 1 adjacent to the portion 1a to be formed of the laminate 1 in the correct position. The mold assembly 20 includes: a mold 21, which includes a recess 22 formed in a shape corresponding to the receiving portion and an outer peripheral wall 23 located on the opposite side of the recess 22 when viewed in a plane, the laminate 1 being mounted on the upper end of the outer peripheral wall; and a retainer 24, which is located at a position corresponding to the upper side of the outer peripheral wall 23 and is configured to press down on the outer peripheral portion of the laminate 1 to fix it in the correct position.

[0078] The punch 30 is a structure used to press the portion 1a of the laminate 1 to be formed, which is fixed in the correct position by the mold assembly 20, to form the receiving portion by deep drawing the laminate 1. The punch head 33 is a component constituting the punch 30 and enters the open recess when moving downward. The outer edge of the punch head 33 is rounded so that the laminate 1 is not damaged when it is deep drawn. Although the punch head 33 is sometimes referred to as a punch, in this invention the corresponding portion is referred to as the punch head 33 and the whole including it is referred to as the punch 30.

[0079] The laminate 1 is located between the stationary mold 21 and the retainer 24. More specifically, the outer peripheral portion of the laminate 1, excluding the portion to be formed, is mounted on the upper end of the outer peripheral wall 23 of the stationary mold 21, and the retainer 24 is located on the upper side corresponding to the outer peripheral wall 23. Furthermore, an injection nozzle 40 configured to supply volatile lubricant is provided on one side of the retainer 24.

[0080] The injection nozzle 40 does not overlap with the moving part of the punch head 33. The injection nozzle 40 preferably applies volatile lubricant to the part to be formed 1a, and more preferably to the part of the laminate 1 that is stretched by the punch head 33. Figure 1 The injection nozzle 40 is shown fixed to an inclined surface formed on a portion of the retainer 24, but this is merely an example. The injection nozzle can be fixed anywhere, as long as the injection nozzle 40 does not interfere with the movement path of the punch head 33 and applies volatile lubricant to the target portion of the upper surface of the laminate 1.

[0081] Figure 1 Two injection nozzles 40 are shown; however, the number of injection nozzles can be changed as needed.

[0082] The portion of the punch head 33 that abuts against the laminate 1 may include at least a temperature control unit (not shown) configured to raise or lower the temperature. Raising the temperature can improve the flexibility of the laminate, and allow any residual lubricant after deep drawing to sublimate or evaporate rapidly.

[0083] The forming apparatus 100 according to the invention does not have a separate lubricant collection unit configured to collect volatile lubricant. After the volatile lubricant is applied to the laminate 1 and the laminate 1 is formed by deep drawing, the volatile lubricant according to the invention evaporates very quickly, thus eliminating the need for a separate lubricant collection unit.

[0084] Figures 2 to 5 This is a schematic diagram illustrating a series of steps in manufacturing a battery casing according to an embodiment of the present invention.

[0085] Reference Figure 2 The lower surface of the laminate 1 is fixed to the mold assembly 20, and a punch 30 configured to press the part 1a to be formed is placed above the laminate 1.

[0086] and Figure 2 Refer to together Figure 1 With the lower surface of the laminate 1 fixed to the upper end of the outer peripheral wall 23 of the stationary mold 21, the upper surface of the laminate 1 is pressed by the retainer 24 to fix it in the correct position. After the laminate 1 is fixed in the correct position by the mold assembly 20, a deep drawing process is performed to form the receiving portion. Before performing the deep drawing process, a volatile lubricant is applied to the laminate through the injection nozzle 40.

[0087] Reference Figure 3 This shows the state in which the punch 30 is abutting against the upper surface of the laminate 1 before the receiving portion is formed in the laminate 1. At this time, the injection nozzle 40 does not interfere with the movement trajectory of the punch 30.

[0088] The punch 30 moves linearly in the direction indicated by the arrow while positioned above the laminate 1, so that the lower end surface of the punch abuts against the upper surface of the part 1a to be formed.

[0089] Next, refer to Figure 4 The diagram schematically illustrates the process of forming a receiving portion in the laminate 1 by pressing the portion 1a to be formed in the laminate 1 with a punch.

[0090] This process is performed continuously with the punch 30 in contact with the laminate 1. The punch moves linearly in the direction indicated by the arrow to press the laminate 1, thereby forming a receiving portion in the laminate 1.

[0091] Specifically, refer to Figure 1 and Figure 4 The punch 30 presses the portion 1a of the laminate 1 to be formed, which is fixed by the mold assembly 20, until the portion to be formed is in close contact with the inner surface of the recess 22, thereby forming a receiving portion.

[0092] Next, refer to Figure 5 This shows the final state of the laminate 1 with the containment portion formed.

[0093] As described above, performing a deep drawing process in which a volatile lubricant is applied to the laminate through an injection nozzle 40 and a receiving portion is formed in the laminate can minimize external defects of the laminate 1, improve the formability of the stretched laminate 1, and reduce the thickness of the battery casing thus manufactured.

[0094] Those skilled in the art will understand that, based on the above description, various applications and modifications are possible within the scope of this invention.

[0095] (Refer to the labeling explanation)

[0096] 1: Laminated tablets

[0097] 1a: The part to be shaped

[0098] 20: Mold Components

[0099] 21: Mold

[0100] 22: concave part

[0101] 23: Peripheral wall

[0102] 24: Retaining component

[0103] 30: Punch

[0104] 33: Punch headgear

[0105] 40: Injection nozzle.

[0106] Industrial applicability

[0107] This invention relates to a pouch battery casing forming apparatus and a method for manufacturing a pouch battery casing using the apparatus. The pouch battery casing forming apparatus includes a punch configured to form a laminate used as a pouch battery casing into a cuboid shape. The apparatus further includes a volatile lubricant supply unit configured to supply a volatile lubricant between the laminate and the punch to minimize surface damage to the laminate. Therefore, this invention has industrial applicability.

Claims

1. A pouch-shaped battery casing forming apparatus, comprising: A mold having a recessed or penetrating open recess of a size corresponding to the electrode assembly receiving portion, and a sheet material disposed on the upper surface of the mold; A punch having a shape corresponding to the open recess, the punch being positioned above the open recess to perform deep drawing on the sheet, the punch including a punch head configured to enter the open recess when moving downwards; A retainer configured to press against opposite ends of the sheet, thereby securing the sheet to the die for deep drawing; and A lubricant supply unit configured to supply lubricant to the upper surface of the sheet that abuts with the punch head. The lubricant mentioned above is a volatile lubricant. The sheet comprises a laminate configured to have a structure in which a first resin layer having heat-fusion properties, a metal layer having material-barrier properties, and a second resin layer as an outer layer are stacked, or a structure in which a resin layer having heat-fusion properties and a metal layer having material-barrier properties are stacked. The portion of the punch head that engages with the sheet includes a temperature control unit configured to raise or lower the temperature.

2. The pouch battery casing forming apparatus of claim 1, wherein the pouch battery casing forming apparatus is not provided with a separate lubricant collection unit configured to collect lubricant supplied to the upper surface of the sheet.

3. The pouch-shaped battery casing forming apparatus according to claim 1, wherein the lubricant supply unit supplies lubricant only to the drawn portion of the sheet.

4. The pouch-shaped battery casing forming apparatus according to claim 1, wherein the portion of the punch head that abuts the sheet is made of at least a material with a low coefficient of friction.

5. The pouch battery casing forming apparatus of claim 1, wherein the lubricant supply unit comprises an injection nozzle configured to inject lubricant in an aerosol state.

6. The pouch-shaped battery casing forming apparatus according to claim 5, wherein the injection nozzle is fixed to the retainer.

7. A method for manufacturing a pouch battery casing using a pouch battery casing forming apparatus according to any one of claims 1 to 6, the method comprising the following steps: (S1) The sheet is placed between the mold and the punch; (S2) Apply lubricant to the portion of the sheet that abuts with the punch head; and (S3) The sheet is formed into a battery casing using the punch.

8. The method for manufacturing a pouch-shaped battery casing according to claim 7, wherein a lubricant is applied simultaneously to the surface of the punch head and the surface of the sheet.

9. The method for manufacturing a pouch-shaped battery casing according to claim 8, wherein step (S2) is performed using a lubricant in the form of a sprayed aerosol.

10. The method for manufacturing a pouch-shaped battery casing according to claim 9, wherein the injection nozzle fixed to the retainer sprays a lubricant in an aerosol state.

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