Bag-shaped piece manufacturing equipment

Abstract

The present invention relates to a pouch manufacturing apparatus. The pouch manufacturing apparatus may include: a lower mold including a forming region formed to be recessed inward so as to form a cup-shaped portion in a pouch film, and a support region formed to be flat at an outer side portion of the forming region; a punch provided to press the bag film to be placed on the lower mold toward the forming area; a stripper provided to press the bag film toward the support region so as to support the bag film while the bag film is pressed by the punch; and a local pressing portion for causing the first region to be pressed more strongly than the second region in the first region and the second region of the pouch film pressed by the stripper.

Description

Technical Field

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2023-0043649, filed in Korea on April 3, 2023, and Korean Patent Application No. 10-2024-0044116, filed in Korea on April 1, 2024, the disclosures of which are incorporated herein by reference. Technical Field

[0004] The present disclosure relates to a bag-shaped member manufacturing apparatus. Background Art

[0005] Generally, unlike primary batteries that cannot be recharged, secondary batteries refer to rechargeable batteries and are widely used in electronic devices such as mobile phones, laptop computers, and cameras, or in electric vehicles. In particular, due to their higher capacity and high energy density compared to nickel-cadmium batteries or nickel-metal hydride batteries, lithium secondary batteries are increasingly used in a wide range of applications.

[0006] According to the shape of the battery case, secondary batteries can be classified into: cylindrical batteries or prismatic batteries, where the electrode assembly is included in a cylindrical metal can or a prismatic metal can; and pouch-type batteries, where the electrode assembly is included in a pouch-shaped case of a laminated sheet.

[0007] Figure 1 is a diagram showing an example of a pouch-type secondary battery. The pouch-type secondary battery (or pouch-type cell) 1 includes: an electrode assembly 2 including electrodes and separators stacked in an alternating manner; and a pouch-type packaging material member 20 that houses the electrode assembly 2. Each electrode in the electrode assembly 2 can be connected to each electrode tab 15. The electrode tabs 15 can be welded to each other at a predetermined area and then connected to an electrode lead 17 by welding. The packaging material member 20 includes a receiving portion 21 (cup-shaped portion), and the electrode assembly 2 is received in the receiving portion 21 (cup-shaped portion). The receiving portion 21 of the packaging material member 20 can be formed as one or two recessed portions. Figure 1 Shows the receiving portion 21 formed as two recessed portions. The packaging material member 20 can be made through a forming process of a pouch film. A sealing portion 23 (platform) is formed around the receiving portion 21 by sealing.

[0008] Meanwhile, the bag-shaped packaging material piece 20 can be made by partially pressing the bag film. For example, when a part of the bag film is pressed by a punch, a receiving part 21 can be formed in the bag film. During the pressing, another part of the bag film is usually pressed and held by a stripper. However, the stripper usually presses the bag film evenly. Even pressing is likely to cause wrinkling near the part of the bag film pressed by the punch. Recently, applying a stainless steel layer as the metal layer of the bag film has been considered. However, since metals such as stainless steel have higher hardness, when performing the forming process as described above, wrinkling is very likely to occur in the bag film during forming. Summary of the Invention

[0009] Technical Problem

[0010] The present disclosure relates to providing a bag-shaped piece manufacturing device for reducing or preventing cracks or wrinkles in a bag film during the forming process of the bag film.

[0011] Technical Solution

[0012] In an embodiment, the bag-shaped piece manufacturing device may include: a lower mold including a forming area and a supporting area, the forming area being recessed inward to form a cup-shaped part in the bag film, and the supporting area being flat on the outer side of the forming area; a punch configured to press the bag film to be placed on the lower mold toward the forming area; a stripper configured to press the bag film toward the supporting area to support the bag film during the pressing by the punch; and a partial pressing part for causing a first area in a first area and a second area of the bag film pressed by the stripper to be pressed stronger than the second area.

[0013] In another embodiment, the partial pressing part may include: a protruding part located in either the stripper or the supporting area facing the stripper; and a recessed part located in the other of the stripper and the supporting area facing the stripper and matching the protruding part.

[0014] In another embodiment, the protruding part may protrude toward the recessed part, and the recessed part may be recessed to accommodate the protruding part.

[0015] In another embodiment, the protruding part may include: a long-side parallel protruding part arranged parallel to the long side among the sides of the forming area; and a short-side parallel protruding part arranged parallel to the short side among the sides of the forming area that extends perpendicular to the long side.

[0016] In another embodiment, the end of the long-side parallel protruding part may protrude outward beyond the end of the long side among the sides of the forming area along the extending direction of the long-side parallel protruding part.

[0017] In another embodiment, the end of the short-side parallel protruding portion may protrude outward beyond the end of the short side among the sides of the forming area along the extending direction of the short-side parallel protruding portion.

[0018] In another embodiment, the end of the long-side parallel protruding portion may be positioned adjacent to the end of the short-side parallel protruding portion and may not be connected to the short-side parallel protruding portion.

[0019] In another embodiment, the protruding portion may further include a long-side inclined protruding portion that extends at an inclination relative to the long-side parallel protruding portion at the end of the long-side parallel protruding portion.

[0020] In another embodiment, the protruding portion may further include a short-side inclined protruding portion that extends at an inclination relative to the short-side parallel protruding portion at the end of the short-side parallel protruding portion.

[0021] In another embodiment, the protruding portion may further include a guiding protruding portion that extends across between the end of the long-side parallel protruding portion and the end of the short-side parallel protruding portion.

[0022] In another embodiment, the protruding portion may further include a guiding protruding portion that extends across and blocks between the end of the long-side parallel protruding portion and the end of the short-side parallel protruding portion.

[0023] In another embodiment, the height of the protruding portion may be greater than or equal to 0.5 mm and less than 2 mm.

[0024] In another embodiment, the protruding portion may have: a horizontal portion that is spaced upward from the supporting area and formed horizontally; a bent portion having a bent shape that extends from the end of the horizontal portion; and a vertical portion that extends from the end of the two ends of the bent portion that is not connected to the horizontal portion toward the supporting area.

[0025] In another embodiment, the demolding device may include: a demolding device body having a pressing surface configured to press the bag film, and the demolding device body forms the exterior of the demolding device; a top inner wall that is formed horizontally within the demolding device body; a vertical inner wall that is formed vertically upward from the pressing surface within the demolding device body to define a recessed portion together with the top inner wall; and a bent connecting portion that connects the lower end of the vertical inner wall to the pressing surface.

[0026] In another embodiment, the local pressing portion may include: a protruding plate provided on the support area; and a covering member that covers at least a part of the support area above the support area, wherein the protruding plate is provided on the inner side, and the covering member may protrude partially toward the demolding device through the protruding plate provided on the inner side.

[0027] In another embodiment, the bag film may include a metal layer of stainless steel.

[0028] Advantageous effects

[0029] According to the present disclosure, the bag film can be strongly locally pressed by the local pressing portion to reduce or prevent cracks or wrinkles in the bag film during the forming process of the bag film. Description of the drawings

[0030] Figure 1 is a diagram showing an example of a pouch-type secondary battery.

[0031] Figure 2 is a perspective view of a pouch manufacturing apparatus according to Embodiment 1 of the present disclosure.

[0032] Figure 3 is Figure 2 a cross-sectional view of the pouch manufacturing apparatus.

[0033] Figure 4 is Figure 2 a top view of the lower mold.

[0034] Figure 5 is formed by Figure 2 a perspective view of the bag film formed by the pouch manufacturing apparatus.

[0035] Figure 6 is a diagram showing Figure 2 a first variant of the protruding portion.

[0036] Figure 7 is a diagram showing Figure 2 a second variant of the protruding portion.

[0037] Figure 8 is a diagram showing Figure 2 a third variant of the protruding portion.

[0038] Figure 9 is a diagram showing Figure 2 a fourth variant of the protruding portion.

[0039] Figure 10 is Figure 3 an enlarged cross-sectional view of the local pressing portion.

[0040] Figure 11is a cross-sectional view showing a bag-shaped member manufacturing apparatus according to Embodiment 2 of the present disclosure. Detailed Description

[0041] Hereinafter, exemplary embodiments of the present disclosure will be described in sufficient detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present disclosure pertains can easily implement the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited or restricted by the following embodiments.

[0042] To clearly describe the present disclosure, detailed descriptions or irrelevant descriptions of related known technologies that may unnecessarily obscure the subject matter of the present disclosure are omitted, and when adding reference numerals to the elements in the respective drawings, the same or similar reference numerals are added to the same or similar elements throughout the specification.

[0043] It should be understood that the terms or words used in the specification and the appended claims should not be construed as limited to the general meaning and dictionary meaning, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure on the basis of the principle that allows the inventor to appropriately define the terms for the best interpretation.

[0044] Embodiment 1

[0045] Figure 2 is a perspective view showing a bag-shaped member manufacturing apparatus according to Embodiment 1 of the present disclosure, and Figure 3 is Figure 2 a cross-sectional view of the bag-shaped member manufacturing apparatus. As Figure 2 and Figure 3 shown, the bag-shaped member manufacturing apparatus according to Embodiment 1 of the present disclosure may include a lower mold 110, a punch 130, and a stripper 150. As a reference, the description of Embodiment 1 can be equivalently applied to the following embodiments as long as they do not conflict with each other.

[0046] Basic structure of the bag - like part manufacturing equipment

[0047] The lower mold 110 may include a forming area 111 that is recessed inward to form a cup-shaped portion 21 (see Figure 3 ) in a bag film F (see Figure 5 ). The forming area 111 may be a groove or a hole recessed downward from the upper surface 117 of a lower mold body 115 that forms the exterior of the lower mold 110. The lower mold 110 may include a support area 113 that is substantially flat on the outer side of the forming area 111. The support area 113 may be all or part of the upper surface 117 of the lower mold body 115 surrounding the forming area 111.

[0048] The punch 130 may be a block-shaped member configured to press the bag film F placed on the lower die 110 toward the forming area 111. By pressing, a cup-shaped portion 21 may be formed in the bag film F. The punch 130 may be supported by the upper die 120, which is disposed above and spaced apart from the lower die 110. A connecting column B may be present between the upper die 120 and the lower die 110 to maintain a gap between the upper die 120 and the lower die 110. Cylinders 171, 176 may be provided at the upper die 120 to move the punch 130 or the demolding device 150 up and down, as described below.

[0049] The punch 130 may be configured to move toward the forming area 111 in a state where it is supported by the upper die 120. For example, the punch 130 may be connected to a punch cylinder 171 fixed to the upper die 120, and thus indirectly fixed to the upper die 120, and the punch 130 may be moved in an upward direction and a downward direction relative to the upper die 120 by the operation of the punch cylinder 171. The punch cylinder 171 may include a cylinder body 172 and a cylinder rod 173, and the cylinder rod 173 reciprocates by fluid pressure supplied into the cylinder body 172. The punch 130 may be connected to the cylinder rod 173 of the punch cylinder 171.

[0050] The ejector 150 may be used to support the bag film F when the bag film F is pressed by the punch 130, and is configured to press the bag film F placed on the lower mold 110 toward the support area 113 of the lower mold 110. The ejector 150 may hold the bag film F by pressing. The ejector 150 may be connected to an ejector cylinder 176 fixed to the upper mold 120, and thus indirectly fixed to the upper mold 120. The ejector 150 may be moved in an upward direction and a downward direction relative to the upper mold 120 by the operation of the ejector cylinder 176. The ejector cylinder 176 may include a cylinder body 177 and a cylinder rod 178, and the cylinder rod 178 is reciprocated by the fluid pressure supplied into the cylinder body 177. The ejector 150 may be connected to the cylinder rod 178. Figure 2 The demolding device 150 is shown, which is generally rectangular in shape, specifically having a rectangular hole H inside (see Figure 3 ) in the shape of an album frame. The punch 130 may move through the stripper 150 in upward and downward directions through a hole H at a central portion of the stripper 150.

[0051] In the following, reference will be made to Figure 3A description is given of the forming process of the bag film F formed by the bag-shaped member manufacturing apparatus according to the present embodiment. When the bag film F is placed on the lower mold 110, the ejector 150 moves downward through the ejector cylinder 176. The ejector 150 can press the bag film F placed on the support area 113 of the lower mold 110 to hold the bag film F during the forming process of the bag film F. Subsequently, the punch 130 moves downward through the punch cylinder 171. Then, the bag film F can be pressed to form the cup-shaped portion 21 (see Figure 5 ). Subsequently, the punch 130 moves upward through the punch cylinder 171.

[0052] Local pressing part of the bag - like part manufacturing equipment

[0053] As Figure 2 and Figure 3 shown, the bag-shaped member manufacturing apparatus according to Embodiment 1 of the present disclosure may include a local pressing portion 190. The local pressing portion 190 can cause the first region F1 in the first region F1 and the second region F2 of the bag film F pressed by the ejector 150 to be pressed more strongly than the second region F2 (see Figure 3 ). The first region F1 may be a portion of the bag film F located between the ejector 150 and the support area 113 of the lower mold 110. The second region F2 may be another portion of the bag film F located between the ejector 150 and the support area 113 of the lower mold 110. For example, when the portion of the bag film F located between the ejector 150 and the support area 113 is divided into two or more regions, any one of these regions may be the first region F1, and the other region may be the second region F2. Figure 3 It is shown that the portion corresponding to the protruding portion 191 described below is the first region F1, and the remaining portion is the second region F2. The local pressing portion 190 can cause a part (the first region) of the region of the bag film F located between the ejector 150 and the support area 113 (for example, the first region and the second region) to be pressed more strongly.

[0054] The local pressing portion 190 can reduce or prevent cracks or wrinkles in the bag film F during the forming process by locally pressing. In the absence of the local pressing portion 190, the portion of the bag film F located between the ejector 150 and the support area 113 will be pressed substantially uniformly by the ejector 150 during the forming process. However, uniform pressing may cause wrinkles near the portion of the bag film F pressed by the punch 130. However, in the case of having the local pressing portion 190, a part (the first region) of the region of the bag film F located between the ejector 150 and the support area 113 is pressed more strongly, resulting in fewer wrinkles.

[0055] The local pressing portion 190 may include a protruding portion 191 that is located in either the demolding device 150 or the support area 113 facing the demolding device 150. The local pressing portion 190 may include a recessed portion 193 that is located in the other of the demolding device 150 and the support area 113 facing the demolding device 150. Figure 2 and Figure 3 shows the recessed portion 193 in the demolding device 150 and the protruding portion 191 in the support area 113.

[0056] The protruding portion 191 may be formed to match the recessed portion 193. Here, "matching" refers to position matching, not shape matching. For example, the protruding portion 191 may have a semi-circular cross-section, while the recessed portion 193 may have a quadrilateral cross-section. However, the protruding portion 191 and the recessed portion 193 may be formed at the position where the demolding device 150 and the support area 113 meet when the demolding device 150 and the support area 113 approach each other due to the movement of the demolding device 150.

[0057] The protruding portion 191 may protrude toward the recessed portion 193. The recessed portion 193 may be recessed to accommodate the protruding portion 191. When the demolding device 150 and the support area 113 approach each other due to the movement of the demolding device 150, the protruding portion 191 may be inserted into the recessed portion 193.

[0058] When the protruding portion 191 and the recessed portion 193 are formed, the portion of the bag film F pressed by the protruding portion 191 (e.g., the first area) may be pressed stronger than the portion (e.g., the second area) pressed by the opposing surfaces of the demolding device 150 and the support area 113 in the absence of the protruding portion 191.

[0059] Meanwhile, as Figure 4 shown, the protruding portion 191 may include: a long-side parallel protruding portion 191L that is arranged parallel to the long side L of the sides of the forming area 111; and a short-side parallel protruding portion 191S that is arranged parallel to the short side S of the sides of the forming area 111 that extends perpendicular to the long side L. Figure 4 is Figure 2 a top view of the lower mold 110. The recessed portion 193 may also include: a long-side parallel recessed portion 193L (see Figure 2 ), the long-side parallel recessed portion 193L matching the long-side parallel protruding portion 191L; and a short-side parallel recessed portion 193S (see Figure 2 ), the short-side parallel recessed portion 193S matching the short-side parallel protruding portion 191S.

[0060] In this configuration, the protruding portion 191 and the recessed portion 193 can be arranged such that they at least partially surround the portion of the bag film F pressed by the punch 130, thereby further suppressing wrinkles. As Figure 4 shown, there can be a pair of long-side parallel protruding portions 191L and a pair of short-side parallel protruding portions 191S to completely surround the portion of the bag film F pressed by the punch 130. The same applies to the long-side parallel recessed portion 193L and the short-side parallel recessed portion 193S. For reference, when the forming region 111 has a rectangular cross-section, the long side L of the forming region 111 can be longer than the short side S of the forming region 111. However, in the present disclosure, when the forming region 111 has a square cross-section, the long side L and the short side S of the forming region 111 can be sides of the same length.

[0061] Meanwhile, the end of the long-side parallel protruding portion 191L can protrude outward along the extending direction of the long-side parallel protruding portion 191L beyond the end of the long side L of the sides of the forming region 111 (see Figure 4 A1 in). The two ends of the long-side parallel protruding portion 191L can protrude outward beyond the two ends of the long side L of the sides of the forming region 111. The long-side parallel recessed portion 193L can also be formed to match the long-side parallel protruding portion 191L. The end of the short-side parallel protruding portion 191S can also protrude outward along the extending direction of the short-side parallel protruding portion 191S beyond the end of the short side S of the sides of the forming region 111 (see Figure 4 A2 in). The two ends of the short-side parallel protruding portion 191S can protrude outward beyond the two ends of the short side S of the sides of the forming region 111. The short-side parallel recessed portion 193S can also be formed to match the short-side parallel protruding portion 191S.

[0062] The end of the long-side parallel protruding portion 191L can be set close to the end of the short-side parallel protruding portion 191S, but cannot be connected to the short-side parallel protruding portion 191S. To match the long-side parallel protruding portion 191L and the short-side parallel protruding portion 191S, the long-side parallel recessed portion 193L and the short-side parallel recessed portion 193S can be formed. The long-side parallel protruding portion 191L and the short-side parallel protruding portion 191S provided around almost the entire forming region 111 of the lower die 110 can effectively suppress wrinkles. However, when the long-side parallel protruding portion 191L and the short-side parallel protruding portion 191S are provided around the entire forming region 111, wrinkles may occur near the vertex formed by the intersection of the long-side parallel protruding portion 191L and the short-side parallel protruding portion 191S.

[0063] When forming the bag film F by the manufacturing apparatus of the present embodiment, a bag film having a Figure 5 shape can be obtained. Figure 5 is formed byFigure 2 A perspective view of a bag film formed by a bag-shaped member manufacturing apparatus. When a part of the bag film F is pressed by the punch 130, a cup-shaped portion 21 can be formed. When another part of the bag film F is pressed by the protruding portion 191, a groove 30 can be formed. When two Figure 5 sheets of the bag film are prepared and joined to each other with the electrode assembly interposed therebetween, a pouch-type battery can be obtained. The groove 30 portion can be cut during the manufacturing process of the pouch-type battery.

[0064] Meanwhile, as Figure 6 shown, the protruding portion 191 can further include a long-side inclined protruding portion 191I1 that extends inclined with respect to the long-side parallel protruding portion 191L at the end of the long-side parallel protruding portion 191L. As Figure 6 shown, the protruding portion 191 can further include a short-side inclined protruding portion 191I2 that extends inclined with respect to the short-side parallel protruding portion 191S at the end of the short-side parallel protruding portion 191S. Figure 6 is a plan view showing a first modification of the Figure 2 protruding portion. Each long-side inclined protruding portion 191I1 can be provided at each of the two ends of the long-side parallel protruding portion 191L. Each short-side inclined protruding portion 191I2 can also be provided at each of the two ends of the short-side parallel protruding portion 191S. The inclined protruding portions 191I1, 191I2 may not be connected to each other. The inclined protruding portions 191I1, 191I2 can extend inclined in a direction away from the vertex formed by the intersection of the long side L and the short side S of the sides of the forming region 111 at each end. The inclined protruding portions 191I1, 191I2 can guide the movement of the bag film F that may occur near the vertex during the forming process of the bag film F (see Figure 3 ), and the improvement of the movement can further suppress wrinkles near the vertex.

[0065] Figure 2 The protruding portion 191 of Figure 7 can be modified as Figure 7 shown. Figure 2 is a plan view showing a second modification of the Figure 7The protruding portion 191' may include a long-side parallel protruding portion 191L' and a short-side parallel protruding portion 191S'. The protruding portion 191' may further include a long-side inclined protruding portion 191I1', which extends at an inclination with respect to the long-side parallel protruding portion 191L' at the end of the long-side parallel protruding portion 191L'. The protruding portion 191' may further include a short-side inclined protruding portion 191I2', which extends at an inclination with respect to the short-side parallel protruding portion 191S' at the end of the short-side parallel protruding portion 191S'. Contrary to Figure 6 the inclined protruding portions 191I1, 191I2 of Figure 7 the inclined protruding portions 191I1', 191I2' of Figure 7 may extend at an inclination in a direction approaching the vertex between the long side L and the short side S at each end. For example, Figure 7 the inclined protruding portions 191I1', 191I2' of

[0066] Figure 2 the protruding portion 191 in Figure 8 may be modified as shown. Figure 8 is a plan view showing Figure 2 a third modification of the protruding portion of Figure 8 The protruding portion 191” of Figure 8 may include a long-side parallel protruding portion 191L” and a short-side parallel protruding portion 191S”. The protruding portion 191” may further include a guiding protruding portion 191G”, which extends across between the end of the long-side parallel protruding portion 191L” and the end of the short-side parallel protruding portion 191S”. For example, the guiding protruding portion 191G” may extend in a direction connecting the vertex formed by the intersection of the extension lines of the long-side parallel protruding portion 191L” and the short-side parallel protruding portion 191S” to the vertex formed by the intersection of the long side L and the short side S of the forming region 111.

[0067] Figure 2 the protruding portion 191 of Figure 9 may be modified as shown. Figure 9 is a view showing Figure 2Plan view of the fourth variant of the protruding portion. Figure 9 The protruding portion 191”’ may include a long-side parallel protruding portion 191L”’ and a short-side parallel protruding portion 191S”’. The protruding portion 191”’ may further include a guiding protruding portion 191G”’, which extends across between the end of the long-side parallel protruding portion 191L”’ and the end of the short-side parallel protruding portion 191S”’. For example, the guiding protruding portion 191G”’ may extend in a direction perpendicular to the straight line that connects the vertex formed by the intersection of the extension lines of the long-side parallel protruding portion 191L”’ and the short-side parallel protruding portion 191S”’ to the vertex formed by the intersection of the long side L and the short side S of the forming area 111. The guiding protruding portion 191G”’ may extend substantially parallel to the straight line connecting the end of the long-side parallel protruding portion 191L”’ and the end of the short-side parallel protruding portion 191S”’. Figure 9 Four guiding protruding portions 191G”’ corresponding to the four vertices of the forming area 111 are exemplarily shown. Figure 9 The guiding protruding portion 191G”’ of may further suppress wrinkles near the vertices of the forming area 111.

[0068] Protruding part and recessed part of the local pressing part

[0069] Reference will be made to Figure 10 Describe the protruding portion 191 and the recessed portion 193 of the local pressing portion 190. Figure 10 Is Figure 3 An enlarged cross-sectional view of the local pressing portion.

[0070] The protruding portion 191 may include a horizontally formed horizontal portion 191H, a vertically formed vertical portion 191V, and a curved portion 191R having a curved shape that connects the horizontal portion 191H to the vertical portion 191V. When the protruding portion 191 is formed at the support area 113 of the lower mold 110, the horizontal portion 191H may be located above the support area 113 and spaced apart from the support area 113. The curved portion 191R may extend from the end of the horizontal portion 191H. The curved portion 191R may extend from each of the two ends of the horizontal portion 191H. The vertical portion 191V may extend from the end of the curved portion 191R that is not connected to the horizontal portion 191H among the two ends of the curved portion 191R toward the support area 113.

[0071] When the protruding portion 191 includes the curved portion 191R, the protruding portion 191 has a rounded edge, thereby preventing damage to the bag film F while the bag film F is pressed by the local pressing portion 190. As a reference, each of the horizontal portion 191H, the vertical portion 191V, and the curved portion 191R of the protruding portion 191 may be one of the sides of the protruding portion 191.

[0072] The recessed portion 193 may be defined as a space surrounded by the inner walls 193H, 193V inside the demolding device body 151, and the demolding device body 151 forms the exterior of the demolding device 150. More specifically, the demolding device 150 may include: a demolding device body 151 that forms the exterior of the demolding device 150; a top inner wall 193H that is horizontally formed inside the demolding device body 151; and a vertical inner wall 193V that is vertically formed upward inside the demolding device body 151 from the pressing surface 152 of the demolding device body 151. The vertical inner wall 193V may define the recessed portion 193 together with the top inner wall 193H.

[0073] The demolding device 150 may include a curved connecting portion 193R that connects the lower end portion of the vertical inner wall 193V to the pressing surface 152. With the slightly bent shape, the connecting portion 193R can prevent damage to the bag film F during pressing by the local pressing portion 190. As a reference, the pressing surface 152 of the demolding device body 151 is configured to press the bag film F and may be a part of the outer bottom surface of the demolding device body 151.

[0074] Meanwhile, the height H1 of the protruding portion 191 (see Figure 3 ), for example, the distance from the upper surface of the support region 113 to the horizontal portion 191H of the protruding portion 191 (see Figure 10 ) may be greater than or equal to 0.5 mm and less than 2 mm. When the height of the protruding portion 191 is less than 0.5 mm or greater than or equal to 2 mm, wrinkling may not be sufficiently prevented.

[0075] Structure of the bag film F

[0076] Recently, there has been a need for the following pouch-type battery: in this pouch-type battery, gas is exhausted at a specific position at a very high temperature (for example, 1000 °C). Existing pouch-type batteries typically have a sealed portion 23 (see Figure 1 ) formed by heat fusion between resin layers (layers formed of polypropylene) of the bag film F, and at a very high temperature, the resin layers melt and gas may be exhausted at an undesired position.

[0077] To solve this problem, there is a method of forming a sealing portion by welding a metal layer having a high melting point (e.g., a stainless steel layer). When the sealing portion is formed as described above, due to the very high sealing strength of the sealing portion, the sealing portion will not break at a very high temperature.

[0078] The bag-shaped member manufacturing apparatus of the present embodiment can be adapted to manufacture a bag-shaped member through a bag film F including a metal layer such as stainless steel. Since a metal such as stainless steel has higher hardness, the existing manufacturing apparatus is very likely to cause cracks in the bag film F during the forming process. However, in such a case, the bag-shaped member manufacturing apparatus of this embodiment can minimize the cracks.

[0079] As a reference, the bag film F may include: a metal layer containing stainless steel; a first resin layer located on the inner side portion of the metal layer; and a second resin layer located on the outer side portion of the metal layer. The first resin layer may be a layer formed of polypropylene (PP). The first resin layer requires high insulation and corrosion resistance, and another type of resin that meets these requirements can be used to form the first resin layer. A part of the metal layer to be welded may not have the first resin layer. The second resin layer may be a layer formed of polyethylene terephthalate (PET). The second resin layer is required to protect and electrically insulate the secondary battery, and another type of resin that meets these requirements can be used to form the second resin layer. The bag film F may have any one of the first resin layer and the second resin layer, or may not have the first resin layer and the second resin layer.

[0080] Embodiment 2

[0081] Figure 11 is a cross-sectional view showing a bag-shaped member manufacturing apparatus according to Embodiment 2 of the present disclosure. As Figure 11 shown, the bag-shaped member manufacturing apparatus according to the present embodiment is different from the manufacturing apparatus of Embodiment 1 in the structure of the local pressing portion. As a reference, the description of Embodiment 2 can be equivalently applied to the above embodiments as long as they do not conflict with each other.

[0082] The local pressing portion 190' of the present embodiment may include a protruding plate 196 provided on a support region 113 of the lower mold 110. The protruding plate 196 may be formed of an elastic material that elastically deforms during pressing by the ejector 150. The protruding plate 196 may be provided in the same manner as the above-mentioned protruding portion 191. For example, the protruding plate 196 may be provided around a part of the forming region 111 in a manner similar to the placement of the protruding portion 191 of Figure 4 . Alternatively, the protruding plate 196 may be provided adjacent to the long side L of the forming region 111 (see Figure 4) and the vertices formed by the intersections of the short sides S. In this case, the protruding plates 196 can be provided at each of the four vertices.

[0083] The local pressing portion 190' of the present embodiment may include a covering member 197 that covers at least a part of the support area 113 on the support area 113, wherein the protruding plate 196 is provided on the inner portion. The covering member 197 can partially protrude toward the demolding device 150 by means of the protruding plate 196 provided on the inner portion. This protruding portion can function as the above-mentioned protruding portion 191. For reference, the covering member 197 can be fixed to the lower mold 110 by an adhesive material or a fastener.

[0084] The foregoing description describes the technical spirit of the present disclosure by way of illustration, and those of ordinary skill in the technical field to which the present disclosure pertains can make various modifications and variations without departing from the basic features of the present disclosure.

[0085] Therefore, the disclosed embodiments are provided to describe the technical spirit of the present disclosure, but are not intended to be restrictive, and the scope and technical spirit of the present disclosure are not limited by these embodiments.

[0086] The protection scope of the present disclosure should be interpreted by the appended claims, and it should be interpreted that all technical spirits within the equivalent scope fall within the technical scope of the present disclosure.

Claims

1. A bag-shaped part manufacturing device, comprising: A lower mold, the lower mold including a forming area and a supporting area, the forming area being recessed inward to form a cup-shaped portion in the bag film, and the supporting area being flat on the outer side of the forming area; A punch, the punch being configured to press the bag film to be placed on the lower mold toward the forming area; A demolding device, the demolding device being configured to press the bag film toward the supporting area so as to support the bag film during the pressing by the punch; And A local pressing portion, the local pressing portion being configured to cause a first area in the bag film pressed by the demolding device to be pressed more strongly than a second area.

2. The bag-shaped member manufacturing apparatus according to claim 1, wherein, The local pressing portion includes: A protruding portion, the protruding portion being located in either the demolding device or the supporting area facing the demolding device; and A recessed portion, the recessed portion being located in the other of the demolding device and the supporting area facing the demolding device and matching the protruding portion.

3. The bag-shaped member manufacturing apparatus according to claim 2, wherein, The protruding portion protrudes toward the recessed portion, and wherein, the recessed portion is recessed to accommodate the protruding portion.

4. The bag-shaped member manufacturing apparatus according to claim 2, wherein, The protruding portion includes: a long-side parallel protruding portion, the long-side parallel protruding portion being arranged parallel to the long side of the sides of the forming area; and a short-side parallel protruding portion, the short-side parallel protruding portion being arranged parallel to the short side of the sides of the forming area that extends perpendicular to the long side.

5. The bag-shaped member manufacturing apparatus according to claim 4, wherein, The end of the long-side parallel protruding portion protrudes outward beyond the end of the long side of the sides of the forming area along the extending direction of the long-side parallel protruding portion.

6. The bag-shaped member manufacturing apparatus according to claim 4, wherein, The end of the short-side parallel protruding portion protrudes outward beyond the end of the short side of the sides of the forming area along the extending direction of the short-side parallel protruding portion.

7. The bag-shaped member manufacturing apparatus according to claim 4, wherein, The end of the long-side parallel protruding portion is positioned adjacent to the end of the short-side parallel protruding portion and is not connected to the short-side parallel protruding portion.

8. The bag-shaped member manufacturing apparatus according to claim 4, wherein, The protruding portion further includes a long-side inclined protruding portion, the long-side inclined protruding portion extending at an inclination relative to the long-side parallel protruding portion at the end of the long-side parallel protruding portion.

9. The bag-shaped member manufacturing apparatus according to claim 4, wherein, The protruding portion further includes a short-side inclined protruding portion, the short-side inclined protruding portion extending at an inclination relative to the short-side parallel protruding portion at the end of the short-side parallel protruding portion.

10. The bag-shaped member manufacturing apparatus according to claim 7, wherein, The protruding portion further includes a guiding protruding portion, the guiding protruding portion extending across between the end of the long-side parallel protruding portion and the end of the short-side parallel protruding portion.

11. The bag-shaped member manufacturing apparatus according to claim 7, wherein, The protruding portion further includes a guiding protruding portion, the guiding protruding portion extending across and blocking between the end of the long-side parallel protruding portion and the end of the short-side parallel protruding portion.

12. The bag-shaped member manufacturing apparatus according to claim 2, wherein, The height of the protruding portion is greater than or equal to 0.5 mm and less than 2 mm.

13. The bag-shaped member manufacturing apparatus according to claim 2, wherein, The protruding portion has: A horizontal portion, the horizontal portion being spaced upward from the supporting area and formed horizontally; A curved portion with a curved shape, the curved portion extending from the end of the horizontal portion; And The vertical portion extends from the end of the two ends of the bent portion that is not connected to the horizontal portion toward the support area.

14. The bag-shaped member manufacturing apparatus according to claim 2, wherein The demolding device includes: A demolding device body having a pressing surface configured to press the bag film, and the demolding device body forms the exterior of the demolding device; A top inner wall horizontally formed within the demolding device body; A vertical inner wall vertically formed upward from the pressing surface within the demolding device body to define the recessed portion together with the top inner wall; and A connecting portion having a bent shape that connects the lower end portion of the vertical inner wall to the pressing surface.

15. The bag-shaped member manufacturing apparatus according to claim 1, wherein, The partial pressing portion includes: A protruding plate disposed on the support area; and A covering member that covers at least a part of the support area above the support area, wherein the protruding plate is disposed on the inner side portion, and wherein the covering member partially protrudes toward the demolding device by the protruding plate disposed on the inner side portion.

16. The bag-shaped member manufacturing apparatus according to claim 1, wherein, The bag film includes a metal layer of stainless steel.

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