Battery case molding apparatus and battery case

Abstract

The present invention provides a battery case molding apparatus (10) comprising: a die (100) including a molding hole (110) and a first fixing part (120); a stripper (200) including a punch hole (210) and a second fixing part (220) vertically facing the first fixing part (120); and a punch (300) passing through the punch hole (210) and inserted into the molding hole (110). The first fixing part (120) may comprise alternately formed one or more first protrusion parts (122) and one or more first hole parts (124). The second fixing part (220) may comprise one or more second protrusion parts (222) which can be inserted into the one or more first hole parts (124), respectively, and one or more second hole parts (224) into which the one or more first protrusion parts (122) can be inserted, respectively.

Description

Battery case forming device and battery case

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0043578, dated March 29, 2024, and Korean Patent Application No. 10-2025-0039798, dated March 27, 2025, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery case forming device and a battery case, and relates to a battery case forming device and a battery case, which alleviate the problem of curling of a film due to pressurized fixation even when the film is pressurized and fixed during forming of a cup portion of a battery case.

[0003] The pouch-type secondary battery (50) of Fig. 1 may include an electrode assembly (52) and a battery case (54) in which the electrode assembly (52) is accommodated. The battery case (54) may be manufactured by forming a cup portion (P1) in which the electrode assembly (52) is accommodated by pressurizing a sheet-shaped film (F) using the battery case forming device (10) of Figs. 2 to 4, and then cutting or otherwise processing the same.

[0004] In order to prevent the edge portion (P2) of the film (F) from being pulled toward the cup portion (P1) during molding of the cup portion (P1), the battery case molding device (10) may be provided with first and second fixing portions (120, 220) that pressurize and fix a predetermined portion (R) on the outside of the cup portion (P1) of the film (F) (Figs. 2 to 4). The predetermined portion (R) may be positioned on the edge portion (P2) of the film (F), but may be positioned between the first and second fixing portions (120, 220), and may be pressurized and molded by the first and second fixing portions (120, 220).

[0005] However, the curl of the film (F) may be aggravated by the pressure-formed portion (R) in this way (Fig. 5). If the curl is aggravated, poor transport (e.g., suction transport), poor alignment, or poor processing of the film (F) or individual battery cases (54) may occur. Therefore, a method capable of alleviating the curl of the film (F) is required.

[0006] Prior art literature related to this is Korean Patent Publication No. 10-2022-0057406.

[0007] The present invention has been devised to solve the above-described problem, and the purpose of the present invention is to provide a battery case forming device that alleviates the problem of film curling caused by the first and second fixing parts even when the first and second fixing parts press and fix the film when forming the cup portion of the battery case.

[0008] The purpose of the present invention is to provide a battery case forming device that prevents poor transport, poor alignment, or poor processing of a film or individual battery case.

[0009] The purpose of the present invention is to provide a battery case forming device in which the edge of the film has bending resistance.

[0010] The purpose of the present invention is to provide a battery case forming device that facilitates the transport, alignment, or processing of a film or individual battery case.

[0011] The purpose of the present invention is to provide a battery case forming device in which a film or an individual battery case is formed with protrusions so that an electrolyte can be easily and stably injected into the cup portion.

[0012] The purpose of the present invention is to provide a battery case forming device that prevents forming defects and improves quality.

[0013] The purpose of the present invention is to provide a battery case forming device in which a film is stably fixed under pressure.

[0014] The purpose of the present invention is to provide a battery case forming device that prevents deformation and damage to a film due to first and second fixing parts.

[0015] The present invention aims to provide a battery case forming device in which curls caused by first and second fixing members are uniformly and effectively alleviated.

[0016] The purpose of the present invention is to provide a battery case forming device that effectively alleviates curling that occurs at the edge of a film as a result of forming a cup portion.

[0017] The purpose of the present invention is to provide a battery case forming device that easily and stably injects electrolyte into the cup portion (P1).

[0018] The present invention aims to provide a battery case that alleviates the problem of curling due to a certain portion.

[0019] The present invention aims to provide a battery case that prevents defects such as transport, alignment, processing or sealing.

[0020] The purpose of the present invention is to provide a battery case into which an electrolyte can be easily and stably injected.

[0021] The present invention aims to provide a battery case in which curling is effectively alleviated even when the length of the cup portion is long.

[0022] The purpose of the present invention is to provide a battery case in which molding defects are prevented and quality is improved.

[0023]

[0024] The technical objectives of the present invention are not limited to the aforementioned purposes. Other unmentioned objectives and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0025] To solve the above-described problem, the present invention provides a battery case forming device (10) including a die (100), a stripper (200), and a punch (300).

[0026] The above die (100) may include a forming hole (110) and a first fixing part (120).

[0027] The above-mentioned forming hole (110) can be formed downwardly or through the upper surface of the die (100).

[0028] The above first fixed part (120) can be formed on the upper surface.

[0029] The above stripper (200) may include a punch hole (210) and a second fixing member (220).

[0030] The above punch hole (210) can be formed at a position corresponding to the above molding hole (110).

[0031] The above punch hole (210) can be formed to penetrate the stripper (200) vertically.

[0032] The above second fixing member (220) can be formed on the lower surface of the stripper (200).

[0033] The above second fixing part (220) can face the above first fixing part (120) vertically.

[0034] The above punch (300) can penetrate the punch hole (210).

[0035] The above punch (300) can be inserted into the above forming hole (110).

[0036] The above first fixed part (120) may include one or more first protrusions (122) and one or more first holes (124).

[0037] The one or more first protrusions (122) and the one or more first holes (124) may be formed alternately.

[0038] The above second fixing member (220) may include one or more second protrusions (222) and one or more second holes (224).

[0039] The one or more second protrusions (222) can be inserted into each of the one or more first holes (124).

[0040] One or more of the first protrusions (122) can be inserted into each of the one or more second holes (224).

[0041] In one embodiment, the first fixing member (120) may be formed to extend along the side (S) of the forming hole (110) or obliquely from the side (S).

[0042] The above second fixing part (220) can be formed along the above first fixing part (120).

[0043] In one embodiment, the first fixed portion (120) may be formed to extend along the side (S).

[0044] In one embodiment, the one or more first protrusions (122) and the one or more first holes (124) may be formed alternately along the extension direction of the first fixing member (120).

[0045] In one embodiment, each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222) and each of the second holes (224) may be formed to extend along the extension direction of the first fixing member (120).

[0046] In one embodiment, the lengths of the one or more first protrusions (122) may be equal to each other.

[0047] The lengths of the one or more second protrusions (222) may be equal to each other.

[0048] In one embodiment, the total length of the one or more second protrusions (222) may be greater than the total length of the one or more first protrusions (122).

[0049] In one embodiment, the end of each of the first protrusions (122) and the end of the inner surface of each of the first holes (124) adjacent to each of the first protrusions (122) may be directly connected to each other.

[0050] The end of each of the second protrusions (222) and the end of the inner surface of each of the second holes (224) adjacent to each of the second protrusions (222) can be directly connected to each other.

[0051] In one embodiment, the section in which the first fixing member (120) is formed in the extension direction of the first fixing member (120) may include the entire section in which the side (S) is formed.

[0052] In one embodiment, the forming hole (110) may include a long side (S1) and a short side (S2) that is shorter than the long side (S1).

[0053] The above side (S) may be the long side (S1).

[0054] In one embodiment, the forming hole (110) may have a pair of long sides (S1) located on one side and the other side, and a pair of short sides (S2) connecting both ends of the pair of long sides (S1), respectively.

[0055] The above die (100) may include a pair of the first fixing members (120).

[0056] The above pair of first fixing members (120) can be formed on one side and the other side of a pair of long sides (S1) with the pair of long sides (S1) interposed therebetween.

[0057] The above pair of first fixing members (120) can correspond to a long side (S1) located on one side and a long side (S1) located on the other side, respectively.

[0058] The above pair of first fixing members (120) may be formed to extend along the corresponding long side (S1) or obliquely from the corresponding long side (S1).

[0059] The above stripper (200) may include a pair of the second fixing members (220).

[0060] The above pair of second fixing parts (220) can be formed along the above pair of first fixing parts (120).

[0061] The above pair of second fixing parts (220) can face each other vertically with the above pair of first fixing parts (120).

[0062] In one embodiment, the film (F) formed by the punch (300) and pressurized and fixed by the stripper (200) on the upper portion of the die (100) may have a fold line (L1).

[0063] The above-mentioned bending line (L1) may extend in the extension direction of the side (S) or in a direction oblique to the extension direction of the side (S).

[0064] The above die (100) may include a pair of the first fixing members (120).

[0065] The above pair of first fixing members (120) can be formed symmetrically with respect to the above bending line (L1).

[0066] The above stripper (200) may include a pair of the second fixing members (220).

[0067] The above pair of second fixing parts (220) can be formed along the above pair of first fixing parts (120).

[0068] The above pair of second fixing parts (220) can face each other vertically with the above pair of first fixing parts (120).

[0069] In one embodiment, the number of the first protrusions (122) may be one greater or less than the number of the second protrusions (222).

[0070] In one embodiment, the number of the second protrusions (222) may be greater than the number of the first protrusions (122).

[0071] In one embodiment, the number of the first protrusions (122) may be 1 and the number of the second protrusions (222) may be 2, or the number of the first protrusions (122) may be 2 and the number of the second protrusions (222) may be 1.

[0072] In one embodiment, each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222) and each of the second holes (224) may be formed to extend along the side (S).

[0073] The length of each of the first protrusions (122) and the length of each of the second protrusions (222) may be the same.

[0074] In one embodiment, the battery case forming device (10) may further include a transfer unit and a cutting unit.

[0075] The above-mentioned transport section can transport the film (F) formed by the punch (300) in the longitudinal direction by being pressurized and fixed by the stripper (200) at the upper portion of the die (100).

[0076] The above cutting section can cut a portion of the film (F) in which the cup section (P1) is formed by the punch (300) in the width direction.

[0077] The above-mentioned side (S) may be a side (S) on one side or the other side in the width direction of the above-mentioned forming hole (110).

[0078] The above first fixing member (120) can be formed on the outside of the forming hole (110) in the width direction.

[0079] In addition, to solve the above-described problem, the present invention provides a battery case including a cup portion (P1) and a frame portion (P2).

[0080] The above cup portion (P1) can be formed to protrude in the thickness direction.

[0081] The above cup portion (P1) may have an internal space in which an electrode assembly (52) is accommodated.

[0082] The above-mentioned border portion (P2) can surround the above-mentioned cup portion (P1).

[0083] The above border portion (P2) can be sealed.

[0084] The above-mentioned border portion (P2) may have a predetermined portion (R).

[0085] The above-mentioned portion (R) may include one or more first portions (R1) and one or more second portions (R2).

[0086] The one or more first parts (R1) and the one or more second parts (R2) may be formed alternately.

[0087] Each of the above first portions (R1) can be formed by at least partially recessing one side in the thickness direction.

[0088] Each of the above second portions (R2) can be formed to protrude toward the other side in the thickness direction than the edge portion (P2) outside the above predetermined portion (R).

[0089] In one embodiment, the predetermined portion (R) can be formed together with the cup portion (P1).

[0090] In one embodiment, the predetermined portion (R) may be formed to extend along the cup portion (P1) or obliquely from the cup portion (P1).

[0091] The one or more first parts (R1) and the one or more second parts (R2) may be formed alternately along the extension direction of the predetermined portion (R).

[0092] According to embodiments of the present invention, a die (100) including a molding hole (110) formed downwardly or penetratingly on an upper surface and a first fixing part (120) formed on the upper surface; a stripper (200) including a punch hole (210) formed at a position corresponding to the molding hole (110) and formed penetratingly upward and downward and a second fixing part (220) formed on a lower surface and facing upward and downward the first fixing part (120); and a punch (300) penetrating the punch hole (210) and inserted into the molding hole (110). The first fixing part (120) may include one or more first protrusions (122) and one or more first holes (124) that are formed alternately. The second fixing member (220) may include one or more second protrusions (222) that can be inserted into each of the one or more first holes (124), and one or more second holes (224) into which each of the one or more first protrusions (122) can be inserted.

[0093] Accordingly, even if the predetermined portion (R) of the film (F) located between the first and second fixing portions (120, 220) is pressure-formed by the first and second fixing portions (120, 220) during the molding of the cup portion (P1), the problem of the film (F) curling due to the predetermined portion (R) can be alleviated. Accordingly, defects in the transport (e.g., suction transport), alignment, processing, or sealing of the film (F) or individual battery case (54) can be prevented.

[0094] In addition, the edge portion (P2) of the film (F) can have bending resistance by the one or more first portions (R1) and one or more second portions (R2) formed alternately. Accordingly, the transport, alignment, processing, or sealing of the film (F) or individual battery cases (54) can be facilitated.

[0095] In addition, the predetermined portion (R) may have a thickness-wise unevenness by the one or more first portions (R1) and one or more second portions (R2) that are alternately formed. Accordingly, when the predetermined portion (R) is covered with a film (F), a gap (H) crossing the predetermined portion (R) between the predetermined portion (R) and the film (F) can be securely and stably secured by the unevenness (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0096] According to embodiments of the present invention, the first fixing part (120) may be formed to extend along the side (S) of the forming hole (110) or obliquely from the side (S). The second fixing part (220) may be formed along the first fixing part (120).

[0097] Accordingly, molding defects of the battery case (54) can be prevented and quality can be improved. In addition, even if the length of the side (S) of the molding hole (110) is long, curling can be effectively alleviated.

[0098] According to embodiments of the present invention, the first fixed part (120) may be formed to extend along the side (S).

[0099] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the film (F) can be stably fixed under pressure by the first and second fixing parts (120, 220), and the amount of stretching of the film (F) becomes uniform, so that molding defects of the battery case (54) can be prevented and the quality can be improved.

[0100] According to embodiments of the present invention, the one or more first protrusions (122) and the one or more first holes (124) may be formed alternately along the extension direction of the first fixing member (120).

[0101] Accordingly, the conventional battery case forming device can be used as is simply by changing the first and second fixing parts (120, 220). In addition, since the position of the predetermined part (R) of the film (F) that is pressure-formed by the first and second fixing parts (120, 220) is the same as in the conventional device, the conventional secondary battery manufacturing device can be used as is.

[0102] In addition, when forming the cup portion (P1), the film (F) is stretched in the thickness direction (up and down) along the extension direction of the first fixing portion (120) at both ends of one or more first protrusions (122) and at both ends of one or more second protrusions (222), so that the film (F) can be strongly bonded and fixed to the ends of a total of 2*(n1+n2) protrusions. Accordingly, molding defects of the battery case (54) can be prevented and the quality can be improved.

[0103] Additionally, even if the length of the side (S) of the forming hole (110) is long, the curl can be effectively alleviated.

[0104] According to embodiments of the present invention, each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222) and each of the second holes (224) may be formed to extend along the extension direction of the first fixing member (120).

[0105] Accordingly, when the film (F) is stretched during the forming of the cup portion (P1), the first and second fixing parts (120, 220) can stably pressurize and fix the film (F).

[0106] In addition, the number of the first and second protrusions (122, 222) and the first and second holes (124, 224) can be reduced. Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the total amount by which the film (F) is stretched in the thickness direction (up and down) along the extension direction of the first fixing portion (120) is reduced, so that even if the protrusions (122, 222) and the holes (124, 224) are alternately formed in the fixing portion (120, 220), the film (F) may not be deformed or damaged.

[0107] According to embodiments of the present invention, the lengths of the one or more first protrusions (122) may be equal to each other. The lengths of the one or more second protrusions (222) may be equal to each other.

[0108] Accordingly, curls can be uniformly generated and suppressed in the film (F) or battery case (54). Accordingly, curls generated in the film (F) or battery case (54) can be uniformly and effectively alleviated by the first and second fixing members (120, 220).

[0109] According to embodiments of the present invention, the total length of the one or more second protrusions (222) may be greater than the total length of the one or more first protrusions (122).

[0110] Accordingly, since the total length of one or more (e.g., n2) second portions (R2) is greater than the total length of one or more (e.g., n1) first portions (R1) in the above-described portion (R), the degree to which a curl that is bent to one side (e.g., upward) in the thickness direction is generated in the film (F) or battery case (54) can increase. Accordingly, a curl that is bent to the other side (e.g., downward) in the thickness direction, which occurs in the edge portion (P2) of the film (F) according to the molding of the cup portion (P1), can be effectively alleviated.

[0111] According to embodiments of the present invention, the end portion of each of the first protrusions (122) and the end portion of the inner surface of each of the first holes (124) adjacent to each of the first protrusions (122) may be in direct contact with each other and connected. The end portion of each of the second protrusions (222) and the end portion of the inner surface of each of the second holes (224) adjacent to each of the second protrusions (222) may be in direct contact with each other and connected.

[0112] Accordingly, the section in which the film (F) is pressurized and fixed by the first and second fixing members (120, 220) can be continued in the extension direction of the first fixing member (120). Accordingly, since the film (F) is pressurized and fixed continuously and stably, molding defects of the battery case (54) can be prevented and quality can be improved.

[0113] According to embodiments of the present invention, the section in which the first fixing part (120) is formed in the extension direction of the first fixing part (120) may include the entire section in which the side (S) is formed.

[0114] Accordingly, molding defects in the battery case (54) can be prevented and quality can be improved.

[0115] According to embodiments of the present invention, the forming hole (110) may include a long side (S1) and a short side (S2) having a length smaller than the long side (S1). The side (S) may be the long side (S1).

[0116] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the film (F) portion located on the outer side of the long side (S1) of the molding hole (110) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is molded, the film (F) portion located on the outer side of the long side (S1) of the molding hole (110) can be pulled inward to a greater extent than the film (F) portion located on the outer side of the short side (S2) of the molding hole (110). Accordingly, in the present invention, since the first and second fixing portions (120, 220) are formed on the long side (S1) of the molding hole (110), molding defects of the battery case (54) can be prevented and quality can be improved.

[0117] In addition, since the first / second protrusions (122 / 222) and the first / second hole portions (124 / 224) are alternately formed in the first / second fixing portions (120 / 220), even if the first fixing portion (120) is formed long on the long side (S1) of the forming hole (110) and the predetermined portion (R) is press-formed long by the first and second fixing portions (120, 220), the problem of deepening the curl of the film (F) can be alleviated.

[0118] According to embodiments of the present invention, the forming hole (110) may have a pair of long sides (S1) located on one side and the other side, and a pair of short sides (S2) connecting both ends of the pair of long sides (S1), respectively. The die (100) may include a pair of first fixing parts (120) formed on one side and the other side of the pair of long sides (S1), respectively, with the pair of long sides (S1) interposed therebetween, and respectively corresponding to the long side (S1) located on one side and the long side (S1) located on the other side, and respectively extending along the corresponding long side (S1) or obliquely from the corresponding long side (S1). The above stripper (200) may include a pair of second fixing parts (220) formed along the pair of first fixing parts (120) and facing each other vertically with the pair of first fixing parts (120).

[0119] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the portion of the film (F) located on the outer side of both long sides (S1) of the molding hole (110) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is molded, the portion of the film (F) located on the outer side of both long sides (S1) of the molding hole (110) can be pulled inward to a greater extent than the portion of the film (F) located on the outer side of both short sides (S2) of the molding hole (110). Accordingly, in the present invention, since a pair of first and second fixing portions (120, 220) are formed on the side of both long sides (S1) of the molding hole (110), molding defects of the battery case (54) can be prevented and quality can be improved.

[0120] In addition, since protrusions (122, 222) and holes (124, 224) are alternately formed in each of the fixing parts (120, 220), even if a pair of first fixing parts (120) are formed long on both long sides (S1) of the forming hole (110) and a pair of the predetermined parts (R) are long and press-formed by a pair of first and second fixing parts (120, 220), the problem of curling of the film (F) can be alleviated.

[0121] According to embodiments of the present invention, the film (F) formed by the punch (300) and fixed under pressure by the stripper (200) at the upper portion of the die (100) may have a fold line (L1) extending in the extension direction of the side (S) or extending in a direction oblique to the extension direction of the side (S). The die (100) may include a pair of first fixing parts (120) formed symmetrically with respect to the fold line (L1). The stripper (200) may include a pair of second fixing parts (220) formed along the pair of first fixing parts (120) and facing the pair of first fixing parts (120) vertically, respectively.

[0122] Accordingly, when the film (F) is folded at the fold line (L1), a pair of predetermined portions (R) of the film (F) formed by a pair of first and second fixing portions (120, 220) can be brought into contact with each other while facing each other (Fig. 13). Each predetermined portion (R) can have a thickness-wise unevenness formed along the extension direction of each predetermined portion (R) by one or more (e.g., n1) first portions (R1) and one or more (e.g., n2) second portions (R2) that are alternately formed. Since the thickness-wise unevenness of the pair of predetermined portions (R) is symmetrical to each other, a gap (H) crossing the predetermined portion (R) between the pair of predetermined portions (R) can be securely and stably secured (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0123] According to embodiments of the present invention, the number of the first protrusions (122) may be one larger or smaller than the number of the second protrusions (222).

[0124] Accordingly, either a first protrusion (122) or a first hole (124) may be formed at both ends of the first fixing portion (120) in the extension direction of the first fixing portion (120). Accordingly, either both ends of the predetermined portion (R) may be formed to protrude upward or both may be formed to protrude downward in the extension direction of the first fixing portion (120) (Fig. 12). As a result, curls in the same direction (e.g., downward curls or upward curls) may occur at both ends of the predetermined portion (R). Accordingly, the transport (e.g., suction transport), alignment, or processing of the film (F) or the individual battery case (54) may become easier.

[0125] According to embodiments of the present invention, the number of the second protrusions (222) may be greater than the number of the first protrusions (122).

[0126] Accordingly, since the curl that is bent to one side (e.g., upward) in the thickness direction is predominantly generated at the predetermined portion (R) by the first fixing portion (120), as described above, the curl that is bent to the other side (e.g., downward) in the thickness direction that is generated at the edge portion (P2) of the film (F) according to the molding of the cup portion (P1) can be effectively alleviated.

[0127] In addition, since the second portion (R2) is formed at both ends of the predetermined portion (R) in the extension direction of the first fixing portion (120) (Fig. 12), a curl can be generated in which both ends of the predetermined portion (R) are bent to one side (e.g., upward) in the thickness direction. Accordingly, as described above, a curl generated at the edge portion (P2) of the film (F) due to the formation of the cup portion (P1) and bent to the other side (e.g., downward) in the thickness direction can be effectively alleviated.

[0128] According to embodiments of the present invention, the number of the first protrusions (122) may be 1 and the number of the second protrusions (222) may be 2, or the number of the first protrusions (122) may be 2 and the number of the second protrusions (222) may be 1.

[0129] Accordingly, the first and second fixing parts (120, 220) that cause curls in the same direction to occur at both ends of the predetermined part (R) in the extension direction of the first fixing part (120) can be implemented with a minimum number of first and second protrusions (122, 222) and first and second holes (124, 224). Accordingly, when the film (F) is stretched during molding of the cup part (P1), the total amount by which the film (F) is stretched in the thickness direction along the extension direction of the first fixing part (120) is minimized, so that the film (F) may not be deformed or damaged.

[0130] According to embodiments of the present invention, each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222) and each of the second holes (224) may be formed to extend along the side (S). The length of each of the first protrusions (122) and the length of each of the second protrusions (222) may be equal to each other.

[0131] Accordingly, curls can be uniformly generated and suppressed in the film (F) or battery case (54). Accordingly, curls generated in the film (F) or battery case (54) can be uniformly and effectively alleviated by the first and second fixing members (120, 220).

[0132] According to embodiments of the present invention, the battery case forming device (10) may further include a transporting unit that transports a film (F) formed by the punch (300) in the longitudinal direction while being pressurized and fixed by the stripper (200) at the upper portion of the die (100); and a cutting unit that cuts a portion of the film (F) formed into a cup portion (P1) by the punch (300) in the width direction. The side (S) may be one side or the other side (S) of the forming hole (110) in the width direction. The first fixing unit (120) may be formed on the outside of the forming hole (110) in the width direction.

[0133] Accordingly, when the film (F) is stretched during the forming of the cup portion (P1), the widthwise outer portion of the film (F) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is formed, the degree to which the film (F) is pulled inward from the widthwise outer portion may be greater than the degree to which the film (F) is pulled in the lengthwise direction. This is because the film (F) is extended in the lengthwise direction and the forming of the cup portion (P1) is performed before the cutting of the cutting portion. Accordingly, in the present invention, since the first and second fixing portions (120, 220) are formed on the outer side of the forming hole (110) in the widthwise direction, the forming defect of the battery case (54) can be prevented and the quality can be improved.

[0134] According to embodiments of the present invention, a battery case may include a cup portion (P1) that protrudes in the thickness direction and has an internal space in which an electrode assembly (52) is accommodated; and a rim portion (P2) that surrounds and seals the cup portion (P1) and has a predetermined portion (R). The predetermined portion (R) may include one or more first portions (R1) and one or more second portions (R2) that are alternately formed. Each of the first portions (R1) may be formed to be recessed at least partially on one side in the thickness direction. Each of the second portions (R2) may be formed to protrude on the other side in the thickness direction than the rim portion (P2) outside the predetermined portion (R).

[0135] Accordingly, the problem of curling of the battery case (54) due to the predetermined position (R) can be alleviated. Accordingly, defects in the transport, alignment, processing, or sealing of the battery case (54) can be prevented.

[0136] In addition, the frame portion (P2) can have bending resistance by the one or more first portions (R1) and one or more second portions (R2) formed alternately. Accordingly, the transport, alignment, processing, or sealing of the battery case (54) can be facilitated.

[0137] In addition, the predetermined portion (R) may have a thickness-wise unevenness by the alternately formed one or more first portions (R1) and one or more second portions (R2). Accordingly, a gap (H) crossing the predetermined portion (R) can be securely and stably secured (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0138] According to embodiments of the present invention, the predetermined portion (R) can be formed together with the cup portion (P1).

[0139] Accordingly, even if the predetermined portion (R) is pressure-molded to fix the battery case (54) or film (F) during the molding of the cup portion (P1), the problem of curling of the battery case (54) due to the predetermined portion (R) can be alleviated.

[0140] According to embodiments of the present invention, the predetermined portion (R) may be formed to extend along the cup portion (P1) or obliquely from the cup portion (P1). The one or more first portions (R1) and the one or more second portions (R2) may be formed alternately along the extension direction of the predetermined portion (R).

[0141] Accordingly, even if the length of the cup portion (P1) is long, the curl can be effectively alleviated. In addition, when a predetermined portion (R) is pressure-formed to fix the battery case (54) or film (F) during the molding of the cup portion (P1), molding defects of the battery case (54) can be prevented and the quality can be improved.

[0142]

[0143] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0144] Figure 1 is an exploded perspective view schematically showing a conventional secondary battery.

[0145] Figures 2 and 3 are a perspective view and a cross-sectional view of a conventional battery case forming device.

[0146] Fig. 4 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Figs. 2 and 3.

[0147] Fig. 5 is a cross-sectional view showing a state in which a curl has occurred in the film formed in Fig. 4.

[0148] Fig. 6 is a cross-sectional view showing a state in which a curl occurs in the film when the first part is absent in the film of Fig. 5.

[0149] Figure 7 is a perspective view of a battery case forming device according to one embodiment of the present invention.

[0150] Figure 8 is a cross-sectional view taken along line 8-8' of Figure 7.

[0151] Fig. 9 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Fig. 8.

[0152] Figure 10 is a 10-10' cross-sectional view of Figure 7.

[0153] Fig. 11 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Fig. 10.

[0154] Fig. 12 is a plan view showing a film formed by the battery case forming device of Figs. 7 to 11.

[0155] Fig. 13 is a cross-sectional view schematically showing one embodiment of a battery case formed by cutting and folding the film of Fig. 12.

[0156] Fig. 14 is a perspective view schematically showing another embodiment of a battery case formed by cutting and folding the film of Fig. 12.

[0157] [Explanation of symbols]

[0158] 10: Battery case forming device

[0159] 50: Secondary battery

[0160] 52: Electrode assembly 54: Battery case

[0161] P1: Cup part P2: Rim part

[0162] H: Gap

[0163] F: Film R: Specific area

[0164] R1: Part 1 R2: Part 2

[0165] 100: Die

[0166] 110: Molding hole S: Change

[0167] S1: Long side S2: Short side

[0168] 120: First Fixed Government

[0169] 122: First protrusion 124: First hole

[0170] 200: Stripper 210: Punch hole

[0171] 220: Second Fixed Government

[0172] 222: Second protrusion 224: Second hole

[0173] 300: Punch

[0174] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if a detailed description of a known technology related to the present invention is judged to unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0175] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0176] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0177] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0178] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0179] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0180] Meanwhile, the longitudinal direction, width direction and thickness direction described later may be the longitudinal direction, width direction and thickness direction of the film (F) or battery case (54).

[0181]

[0182] Fig. 1 is an exploded perspective view schematically showing a conventional secondary battery. Fig. 2 and Fig. 3 are a perspective view and a cross-sectional view of a conventional battery case forming device. Fig. 4 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Figs. 2 and 3. Fig. 5 is a cross-sectional view showing a state in which a curl occurs in the film formed in Fig. 4. Fig. 6 is a cross-sectional view showing a state in which a curl occurs in the film of Fig. 5 when the first portion is absent. Fig. 7 is a perspective view of a battery case forming device according to an embodiment of the present invention. Fig. 8 is a cross-sectional view taken along line 8-8' of Fig. 7. Fig. 9 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Fig. 8. Fig. 10 is a cross-sectional view taken along line 10-10' of Fig. 7. Fig. 11 is a cross-sectional view showing a state in which a film is formed using the battery case forming device of Fig. 10. Fig. 12 is a plan view showing a film formed by the battery case forming apparatus of Figs. 7 to 11. Fig. 13 is a cross-sectional view schematically showing one embodiment of a battery case formed by cutting and folding the film of Fig. 12. Fig. 14 is a perspective view schematically showing another embodiment of a battery case formed by cutting and folding the film of Fig. 12.

[0183]

[0184] [Conventional secondary batteries]

[0185] Referring to FIG. 1, a conventional secondary battery (50) according to one embodiment may include an electrode assembly (52) and a battery case (54). The secondary battery (50) may be a pouch-type secondary battery.

[0186] The electrode assembly (52) can be formed by alternately stacking electrodes and separators.

[0187] The battery case (54) may include a cup portion (P1) having a recessed shape to accommodate the electrode assembly (52) therein, and a frame portion (P2) surrounding the cup portion (P1) and forming a seal. The cup portion (P1) may be provided on each of the left and right sides of the battery case (54) as shown in FIG. 1, or, unlike FIG. 1, may be provided on only one side among the left and right sides of the battery case (54). The battery case (54) may be manufactured by a conventional battery case forming device (10) of FIGS. 2 to 4, which will be described later.

[0188] After the electrode assembly (52) is accommodated in the cup portion (P1), the battery case (54) is folded and the left and right edges (P2) of the electrode assembly (52) facing each other are sealed (e.g., heat-sealed) to complete the secondary battery (50).

[0189] Meanwhile, the battery case (54) of FIG. 1 may have the outer portion of the frame (P2) already cut off, so that the first portion (R1) to be described later, which is formed by a conventional battery case forming device (10), may already be removed. Accordingly, the first portion (R1) to be described later may not be shown in the battery case (54) of FIG. 1.

[0190]

[0191] [Conventional battery case forming device]

[0192] Referring to FIGS. 2 to 4, a conventional battery case forming device (10) may include a die (100), a stripper (200), and a punch (300).

[0193] A film (F) can be placed on the upper surface of the die (100). The die (100) can include a forming hole (110) and a first fixing part (120).

[0194] Here, the film (F) may have a sheet shape. When the film (F) is processed (e.g., cut along the cutting line (L2) of FIG. 12) after being formed by the battery case forming device (10), an individual battery case (54) may be formed. The film (F) may include, for example, an outer layer for insulation and electrode assembly (52) protection, a metal layer for maintaining strength and blocking external substances, and an inner layer for sealing (thermal sealing).

[0195] The forming hole (110) can be formed on the upper surface of the die (100). The forming hole (110) can be formed downwardly or through the die.

[0196] The first fixing portion (120) may be formed on the upper surface of the die (100). The first fixing portion (120) may include a first protrusion (122) formed to protrude upward.

[0197] The first fixing part (120) can be formed at a predetermined distance from the forming hole (110). The first fixing part (120) can be formed to extend along the side (S) of the forming hole (110) or obliquely from the side (S).

[0198] The stripper (200) can pressurize and fix the film (F) on top of the die (100). The stripper (200) can include a punch hole (210) and a second fixing part (220).

[0199] The punch hole (210) can be formed at a position corresponding to the molding hole (110). The punch hole (210) can be formed by penetrating the stripper (200) vertically.

[0200] The second fixing part (220) may be formed on the lower surface of the stripper (200). The second fixing part (220) may face the first fixing part (120) from above and below. The second fixing part (220) may be formed by recessing or penetrating upward and may include a second hole (224) into which the first protrusion (122) may be inserted.

[0201] The second fixing portion (220) may be formed along the first fixing portion (120). For example, the second fixing portion (220) may be formed at a predetermined distance from the punch hole (210). The second fixing portion (220) may be formed to extend along the edge of the punch hole (210) or may be formed to extend obliquely from the edge of the punch hole (210).

[0202] The punch (300) can penetrate the punch hole (210) of the stripper (200). The punch (300) can be inserted into the forming hole (110) of the die (100). Accordingly, the punch (300) can form a cup portion (P1) on the film (F). At this time, the edge portion (P2) of the film (F) can be prevented from being pulled toward the cup portion (P1) by the first and second fixing members (120, 220). Accordingly, forming defects of the film (F) or the individual battery case (54) can be prevented, and the quality can be improved.

[0203] Meanwhile, when forming the cup portion (P1), a predetermined portion (R) of the film (F) located between the first and second fixing portions (120, 220) can be pressurized and formed by the first and second fixing portions (120, 220). Specifically, the predetermined portion (R) can include a first portion (R1) that is formed by protruding upward by the first protrusion (122) (Fig. 4).

[0204] Referring to FIGS. 5 and 6, when the first portion (R1) is formed on the film (F) (FIG. 5), the curl of the edge portion (P2) may be more severe than when the first portion (R1) is not formed on the film (F) (FIG. 6). If the curl is severe, problems such as poor transport (e.g., suction transport), poor alignment, or poor processing of the film (F) or individual battery cases (54) may occur. Therefore, a method capable of alleviating such curl is required.

[0205]

[0206] [Battery case forming device of the present invention]

[0207] Referring to FIGS. 7 to 13, a battery case forming device (10) according to one embodiment of the present invention may include a die (100), a stripper (200), and a punch (300) like a conventional battery case forming device (10). The battery case forming device (10) according to one embodiment of the present invention may further include a conveying unit and / or a cutting unit. Hereinafter, differences from the conventional battery case forming device (10) will be examined.

[0208] The first fixing portion (120) may be formed on the upper surface of the die (100). The first fixing portion (120) may include one or more first protrusions (122) and one or more first holes (124). For example, the first fixing portion (120) may include n1 (n1 is a natural number) first protrusions (122) and n2 (n2 is a natural number satisfying |n2-n1|<=1) first holes (124).

[0209] Each first protrusion (122) may be formed to protrude upward from the upper surface of the die (100). Each first hole (124) may be formed to be recessed or penetrated downward from the upper surface of the die (100). One or more first protrusions (122) and one or more first holes (124) may be formed alternately.

[0210] The second fixing part (220) may be formed on the lower surface of the stripper (200). The second fixing part (220) may face the first fixing part (120) from above and below. The second fixing part (220) may include one or more second protrusions (222) and one or more second holes (224). For example, the second fixing part (220) may include n2 second protrusions (222) and n1 second holes (224).

[0211] Each second protrusion (222) may be formed to protrude downward from the lower surface of the stripper (200). One or more (e.g., n2) second protrusions (222) may be respectively inserted into one or more (e.g., n2) first holes (124). Each second hole (224) may be formed to be recessed or penetrated upward from the lower surface of the stripper (200). One or more (e.g., n1) first protrusions (122) may be respectively inserted into one or more (e.g., n1) second holes (224).

[0212] Accordingly, even if the predetermined portion (R) of the film (F) located between the first and second fixing portions (120, 220) is pressure-formed by the first and second fixing portions (120, 220) during the molding of the cup portion (P1), the problem of the film (F) curling due to the predetermined portion (R) can be alleviated. Accordingly, defects in the transport (e.g., suction transport), alignment, processing, or sealing of the film (F) or individual battery case (54) can be prevented.

[0213] Specifically, when the predetermined portion (R) of the film (F) is formed by the first and second fixing portions (120, 220), the predetermined portion (R) may include one or more first portions (R1) and one or more second portions (R2) that are alternately positioned (Figs. 11 and 12). Here, each first portion (R1) may be formed to protrude upward by each first protrusion (122), and each second portion (R2) may be formed to protrude downward by each second protrusion (222) (Figs. 11 and 12). Since the first part (R1) is formed by protruding upward, one side (e.g., the upper side) of each layer of the film (F) or the film (F) is stretched more than the other side (e.g., the lower side), and since the second part (R2) is formed by protruding downward, the other side of each layer of the film (F) or the film (F) in the thickness direction can be stretched more than the one side. Accordingly, for example, the first part (R1) may attempt to generate a curl that is bent in the other side (e.g., downward) of the thickness direction, and the second part (R2) may attempt to generate a curl that is bent in one side (e.g., upward) of the thickness direction. That is, the first part (R1) and the second part (R2) may attempt to generate curls in opposite directions. In the present invention, since one or more first parts (R1) and one or more second parts (R2) are alternately arranged, the curls cancel each other out, so that curl generation can be suppressed / mitigated.

[0214] In addition, the edge portion (P2) of the film (F) can have bending resistance by the one or more first portions (R1) and one or more second portions (R2) formed alternately. Accordingly, the transport, alignment, processing, or sealing of the film (F) or individual battery cases (54) can be facilitated.

[0215] In addition, the predetermined portion (R) may have a thickness-wise unevenness by the one or more first portions (R1) and one or more second portions (R2) that are alternately formed. Accordingly, when the predetermined portion (R) is covered with a film (F), a gap (H) crossing the predetermined portion (R) between the predetermined portion (R) and the film (F) can be securely and stably secured by the unevenness (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0216] The first fixing part (120) may be formed at a predetermined distance from the forming hole (110). The first fixing part (120) may be formed to extend along the side (S) of the forming hole (110) or obliquely with the side (S). The second fixing part (220) may be formed along the first fixing part (120). For example, the second fixing part (220) may be formed to extend along the side of the punch hole (210) at a predetermined distance from the punch hole (210) or obliquely with the side of the punch hole (210).

[0217] Accordingly, molding defects of the battery case (54) can be prevented and quality can be improved. In addition, even if the length of the side (S) of the molding hole (110) is long, curling can be effectively alleviated.

[0218] The first fixed part (120) can be formed to extend along the above-mentioned side (S).

[0219] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the film (F) can be stably fixed under pressure by the first and second fixing parts (120, 220), and the amount of stretching of the film (F) becomes uniform, so that molding defects of the battery case (54) can be prevented and the quality can be improved.

[0220] One or more first protrusions (122) and one or more first holes (124) may be formed alternately along the extension direction of the first fixing member (120). Here, the extension direction of the first fixing member (120) may be, for example, the longitudinal direction of the film (F) (Fig. 12).

[0221] Accordingly, the conventional battery case forming device can be used as is simply by changing the first and second fixing parts (120, 220). In addition, since the position of the predetermined part (R) of the film (F) that is pressure-formed by the first and second fixing parts (120, 220) is the same as in the conventional device, the conventional secondary battery manufacturing device can be used as is.

[0222] In addition, when forming the cup portion (P1), the film (F) is stretched in the thickness direction (up and down) along the extension direction of the first fixing portion (120) at both ends of one or more first protrusions (122) and at both ends of one or more second protrusions (222), so that the film (F) can be strongly bonded and fixed to the ends of a total of 2*(n1+n2) protrusions. Accordingly, molding defects of the battery case (54) can be prevented and the quality can be improved.

[0223] Additionally, even if the length of the side (S) of the forming hole (110) is long, the curl can be effectively alleviated.

[0224] Each first protrusion (122), each first hole (124), each second protrusion (222) and each second hole (224) can be formed to extend along the extension direction of the first fixing member (120).

[0225] Accordingly, when the film (F) is stretched during the forming of the cup portion (P1), the first and second fixing parts (120, 220) can stably pressurize and fix the film (F).

[0226] In addition, the number of the first and second protrusions (122, 222) and the first and second holes (124, 224) can be reduced. Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the total amount by which the film (F) is stretched in the thickness direction (up and down) along the extension direction of the first fixing portion (120) is reduced, so that even if the protrusions (122, 222) and the holes (124, 224) are alternately formed in the fixing portion (120, 220), the film (F) may not be deformed or damaged.

[0227] The lengths of the above one or more (e.g., n1) first protrusions (122) may be the same, and the lengths of the above one or more (e.g., n2) second protrusions (222) may be the same. Here, the length may mean the length in the extension direction of the protrusions (122, 222).

[0228] Accordingly, curls can be uniformly generated and suppressed in the film (F) or battery case (54). Accordingly, curls generated in the film (F) or battery case (54) can be uniformly and effectively alleviated by the first and second fixing members (120, 220).

[0229] The total length of the one or more (e.g., n2) second protrusions (222) may be greater than the total length of the one or more (e.g., n1) first protrusions (122).

[0230] Accordingly, since the total length of one or more (e.g., n2) second portions (R2) is greater than the total length of one or more (e.g., n1) first portions (R1) at the predetermined portion (R), the degree to which a curl is generated that is bent to one side (e.g., upward) in the thickness direction in the film (F) or the battery case (54) can increase. This is because the second portion (R2) is formed to protrude downward by the second protrusion (222), so that the other side (e.g., lower side) in the thickness direction of the film (F) is stretched more than one side (e.g., upper side) so that the second portion (R2) is generated to be bent to one side (e.g., upward) in the thickness direction in the film (F) or the battery case (54).

[0231] Meanwhile, a curl that bends to the other side (e.g., downward) in the thickness direction may occur overall at the edge (P2) of the film (F) according to the molding of the cup portion (P1) (Fig. 6). This may be because, when the cup portion (P1) is molded, one side (e.g., upper) of the edge portion (P2) of the film (F) in the thickness direction is stretched more than the other side (e.g., lower) or because of a difference in elastic recovery rates between one side (e.g., upper layer) and the other side (e.g., lower layer) of the film (F) in the thickness direction. Accordingly, when the total length of one or more (e.g., n2) second protrusions (222) increases and the degree of generating a curl that bends to one side (e.g., upward) in the thickness direction increases, the curl that bends to the other side (e.g., downward) in the thickness direction that occurs at the edge (P2) of the film (F) according to the molding of the cup portion (P1) can be effectively alleviated.

[0232] The end of each first protrusion (122) and the end of the inner surface of each first hole (124) adjacent to each first protrusion (122) may be directly connected to each other (Figs. 10 and 11). In addition, the end of each second protrusion (222) and the end of the inner surface of each second hole (224) adjacent to each second protrusion (222) may be directly connected to each other. Here, the end may mean the end in the extension direction of the first fixing member (120) (Figs. 10 and 11).

[0233] Accordingly, the section in which the film (F) is pressurized and fixed by the first and second fixing members (120, 220) can be continued in the extension direction of the first fixing member (120). Accordingly, since the film (F) is pressurized and fixed continuously and stably, molding defects of the battery case (54) can be prevented and quality can be improved.

[0234] The section in which the first fixing part (120) is formed in the extension direction of the first fixing part (120) may include the entire section in which the side (S) is formed. That is, the section in which the side (S) of the forming hole (110) is formed in the extension direction of the first fixing part (120) may entirely overlap with the section in which the first fixing part (120) is formed.

[0235] Accordingly, molding defects in the battery case (54) can be prevented and quality can be improved.

[0236] Meanwhile, the forming hole (110) may include a long side (S1) and a short side (S2) shorter than the long side (S1). Specifically, a cross-section of the forming hole (110) cut along a plane perpendicular to the vertical direction may have a long side (S1) and a short side (S2). In this case, the first fixing member (120) may be formed to extend along the long side (S1) or obliquely relative to the long side (S1).

[0237] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the film (F) portion located on the outer side of the long side (S1) of the molding hole (110) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is molded, the film (F) portion located on the outer side of the long side (S1) of the molding hole (110) can be pulled inward to a greater extent than the film (F) portion located on the outer side of the short side (S2) of the molding hole (110). Accordingly, in the present invention, since the first and second fixing portions (120, 220) are formed on the long side (S1) of the molding hole (110), molding defects of the battery case (54) can be prevented and quality can be improved.

[0238] In addition, since the first / second protrusions (122 / 222) and the first / second hole portions (124 / 224) are alternately formed in the first / second fixing portions (120 / 220), even if the first fixing portion (120) is formed long on the long side (S1) of the forming hole (110) and the predetermined portion (R) is press-formed long by the first and second fixing portions (120, 220), the problem of deepening the curl of the film (F) can be alleviated.

[0239] The forming hole (110) may have a pair of long sides (S1) located on one side and the other side, and a pair of short sides (S2) connecting the ends of the pair of long sides (S1), respectively. Specifically, for example, a cross-section of the forming hole (110) taken along a plane perpendicular to the vertical direction may have a rectangular shape having a pair of long sides (S1) and a pair of short sides (S2). In this case, the die (100) may include a pair of the first fixing parts (120), and the stripper (200) may include a pair of the second fixing parts (220).

[0240] The pair of first fixing parts (120) may be formed on one side and the other side of the pair of long sides (S1) with the pair of long sides (S1) interposed therebetween, respectively. The pair of first fixing parts (120) may correspond to the long side (S1) located on one side and the long side (S1) located on the other side, respectively. The pair of first fixing parts (120) may be formed to be spaced apart from the corresponding long side (S1) by a predetermined distance, respectively. The pair of first fixing parts (120) may be formed to extend along the corresponding long side (S1) or obliquely from the corresponding long side (S1), respectively.

[0241] The above pair of second fixing parts (220) may be formed respectively along the above pair of first fixing parts (120). The above pair of second fixing parts (220) may face the above pair of first fixing parts (120) in the upper and lower directions, respectively.

[0242] Accordingly, when the film (F) is stretched during the molding of the cup portion (P1), the portion of the film (F) located on the outer side of both long sides (S1) of the molding hole (110) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is molded, the portion of the film (F) located on the outer side of both long sides (S1) of the molding hole (110) can be pulled inward to a greater extent than the portion of the film (F) located on the outer side of both short sides (S2) of the molding hole (110). Accordingly, in the present invention, since a pair of first and second fixing portions (120, 220) are formed on the side of both long sides (S1) of the molding hole (110), molding defects of the battery case (54) can be prevented and quality can be improved.

[0243] In addition, since protrusions (122, 222) and holes (124, 224) are alternately formed in each of the fixing parts (120, 220), even if a pair of first fixing parts (120) are formed long on both long sides (S1) of the forming hole (110) and a pair of the predetermined parts (R) are long and press-formed by a pair of first and second fixing parts (120, 220), the problem of curling of the film (F) can be alleviated.

[0244] Meanwhile, as shown in Fig. 12, the film (F) may have a bend line (L1) extending in the extension direction of the side (S) or extending in a direction oblique to the extension direction of the side (S). In this case, the die (100) may include a pair of the first fixing parts (120), and the stripper (200) may include a pair of the second fixing parts (220).

[0245] The above pair of first fixing parts (120) may be formed symmetrically with respect to the above-described bending line (L1). The above pair of second fixing parts (220) may be formed along the above-described pair of first fixing parts (120) and may face the above-described pair of first fixing parts (120) vertically.

[0246] Accordingly, when the film (F) is folded at the fold line (L1), a pair of predetermined portions (R) of the film (F) formed by a pair of first and second fixing portions (120, 220) can be brought into contact with each other while facing each other (Fig. 13). Each predetermined portion (R) can have a thickness-wise unevenness formed along the extension direction of each predetermined portion (R) by one or more (e.g., n1) first portions (R1) and one or more (e.g., n2) second portions (R2) that are alternately formed. Since the thickness-wise unevenness of the pair of predetermined portions (R) is symmetrical to each other, a gap (H) crossing the predetermined portion (R) between the pair of predetermined portions (R) can be securely and stably secured (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0247] Specifically, when the film (F) is folded at the fold line (L1), the edge portions (P2) on one side and the other side of the film (F) can face each other in the thickness direction. At this time, the first portions (R1) of the edge portions (P2) on both sides can be spread apart while contacting each other inwardly in the thickness direction. Accordingly, the second portions (R2) of the edge portions (P2) on both sides can be spread apart reliably and stably in the thickness direction, and the electrolyte can be stably injected into the gap (H) between the second portions (R2) of the edge portions (P2) on both sides (Fig. 13).

[0248] The number of first protrusions (122) (e.g., n1) may be 1 greater or less than the number of second protrusions (222) (e.g., n2) (Fig. 7, Fig. 10, Fig. 11).

[0249] Accordingly, either a first protrusion (122) or a first hole (124) may be formed at both ends of the first fixing portion (120) in the extension direction of the first fixing portion (120). Accordingly, either both ends of the predetermined portion (R) may be formed to protrude upward or both may be formed to protrude downward in the extension direction of the first fixing portion (120) (Fig. 12). As a result, curls in the same direction (e.g., downward curls or upward curls) may occur at both ends of the predetermined portion (R). Accordingly, the transport (e.g., suction transport), alignment, or processing of the film (F) or the individual battery case (54) may become easier.

[0250] The number of second protrusions (222) (e.g., n2) may be greater than the number of first protrusions (122) (e.g., n1) (Fig. 7, Fig. 10, Fig. 11).

[0251] Accordingly, since the curl that is bent to one side (e.g., upward) in the thickness direction is predominantly generated at the predetermined portion (R) by the first fixing portion (120), as described above, the curl that is bent to the other side (e.g., downward) in the thickness direction that is generated at the edge portion (P2) of the film (F) according to the molding of the cup portion (P1) can be effectively alleviated.

[0252] In addition, since the second portion (R2) is formed at both ends of the predetermined portion (R) in the extension direction of the first fixing portion (120) (Fig. 12), a curl can be generated in which both ends of the predetermined portion (R) are bent to one side (e.g., upward) in the thickness direction. Accordingly, as described above, a curl generated at the edge portion (P2) of the film (F) due to the formation of the cup portion (P1) and bent to the other side (e.g., downward) in the thickness direction can be effectively alleviated.

[0253] The number of first protrusions (122) (e.g., n1) may be 1 and the number of second protrusions (222) (e.g., n2) may be 2, or the number of first protrusions (122) (e.g., n1) may be 2 and the number of second protrusions (222) (e.g., n2) may be 1.

[0254] Accordingly, the first and second fixing parts (120, 220) that cause curls in the same direction to occur at both ends of the predetermined part (R) in the extension direction of the first fixing part (120) can be implemented with a minimum number of first and second protrusions (122, 222) and first and second holes (124, 224). Accordingly, when the film (F) is stretched during molding of the cup part (P1), the total amount by which the film (F) is stretched in the thickness direction along the extension direction of the first fixing part (120) is minimized, so that the film (F) may not be deformed or damaged.

[0255] As described above, when each first protrusion (122), each first hole (124), each second protrusion (222) and each second hole (224) are formed to extend along the side (S), the length of each first protrusion (122) and the length of each second protrusion (222) may be the same.

[0256] Accordingly, curls can be uniformly generated and suppressed in the film (F) or battery case (54). Accordingly, curls generated in the film (F) or battery case (54) can be uniformly and effectively alleviated by the first and second fixing members (120, 220).

[0257] The transport section (not shown) can transport the film (F) in the longitudinal direction (Fig. 12).

[0258] The cutting section can cut a portion of the film (F) in which the cup section (P1) is formed by the punch (300) in the width direction. For example, the cutting section can cut the cutting line (L2) shown in Fig. 12.

[0259] The first fixing member (120) may be formed to extend along one or the other side (S) of the width direction of the forming hole (110) or obliquely from one or the other side (S) of the width direction of the forming hole (110). The first fixing member (120) may be formed on the outside of the forming hole (110) in the width direction.

[0260] Accordingly, when the film (F) is stretched during the forming of the cup portion (P1), the widthwise outer portion of the film (F) can be effectively prevented from being pulled inward past the first and second fixing portions (120, 220). In particular, when the cup portion (P1) is formed, the degree to which the film (F) is pulled inward from the widthwise outer portion may be greater than the degree to which the film (F) is pulled in the lengthwise direction. This is because the film (F) is extended in the lengthwise direction and the forming of the cup portion (P1) is performed before the cutting of the cutting portion. Accordingly, in the present invention, since the first and second fixing portions (120, 220) are formed on the outer side of the forming hole (110) in the widthwise direction, the forming defect of the battery case (54) can be prevented and the quality can be improved.

[0261]

[0262] [Battery case of the present invention]

[0263] Referring further to Fig. 14, a battery case (54) according to one embodiment of the present invention may include a cup portion (P1) and a frame portion (P2). The battery case (54) of Fig. 14 may be formed by the battery case forming device (10) of Figs. 7 to 11 described above.

[0264] The cup portion (P1) may be formed to protrude in the thickness direction. The cup portion (P1) may have an internal space. An electrode assembly (52) may be accommodated in the internal space.

[0265] The rim portion (P2) can surround the cup portion (P1). The rim portion (P2) can be sealed. For example, a pair of rim portions (P2) facing each other in the thickness direction can be sealed by heat fusion. The rim portion (P2) can have a predetermined portion (R).

[0266] The predetermined portion (R) may include one or more (e.g., n1) first portions (R1) and one or more (e.g., n2) second portions (R2).

[0267] Each first portion (R1) may be formed to be recessed at least partially on one side (e.g., lower side) in the thickness direction. Each second portion (R2) may be formed to protrude on the other side (e.g., upper side) in the thickness direction from the outer edge portion (P2) of the predetermined portion (R). Here, the outer edge portion (P2) of the predetermined portion (R) may be a portion of the edge portion (P2) surrounding the predetermined portion (R). One or more first portions (R1) and one or more second portions (R2) may be formed alternately.

[0268] Accordingly, the problem of curling of the battery case (54) due to the predetermined position (R) can be alleviated. Accordingly, defects in the transport, alignment, processing, or sealing of the battery case (54) can be prevented.

[0269] In addition, the frame portion (P2) can have bending resistance by the one or more first portions (R1) and one or more second portions (R2) formed alternately. Accordingly, the transport, alignment, processing, or sealing of the battery case (54) can be facilitated.

[0270] In addition, the predetermined portion (R) may have a thickness-wise unevenness by the alternately formed one or more first portions (R1) and one or more second portions (R2). Accordingly, a gap (H) crossing the predetermined portion (R) can be securely and stably secured (Fig. 13). Through this gap (H), the electrolyte can be easily and stably injected into the cup portion (P1).

[0271] The small portion (R) can be formed together with the cup portion (P1).

[0272] Accordingly, even if the predetermined portion (R) is pressure-molded to fix the battery case (54) or film (F) during the molding of the cup portion (P1), the problem of curling of the battery case (54) due to the predetermined portion (R) can be alleviated.

[0273] The predetermined portion (R) may be formed to extend along the cup portion (P1) or at an angle to the cup portion (P1). The one or more first portions (R1) and the one or more second portions (R2) may be formed alternately along the extension direction of the predetermined portion (R).

[0274] Accordingly, even if the length of the cup portion (P1) is long, the curl can be effectively alleviated. In addition, when a predetermined portion (R) is pressure-formed to fix the battery case (54) or film (F) during the molding of the cup portion (P1), molding defects of the battery case (54) can be prevented and the quality can be improved.

[0275] Each of the first portions (R1) and each of the second portions (R2) may be formed to extend along the extension direction of the predetermined portion (R). The lengths of one or more of the first portions (R1) may be the same. The lengths of one or more of the second portions (R2) may be the same. The total length of one or more of the second portions (R2) may be greater than the total length of one or more of the first portions (R1).

[0276] Meanwhile, matters not mentioned in relation to the battery case (54) of the present invention can be inferred from the battery case forming device (10) of the present invention described above.

[0277]

[0278] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all variations and modifications derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0279] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A die (100) including a molding hole (110) formed downwardly or penetratingly on the upper surface and a first fixing part (120) formed on the upper surface; A stripper (200) including a punch hole (210) formed in a position corresponding to the above-mentioned molding hole (110) and formed vertically penetratingly, and a second fixing part (220) formed on the lower surface and facing the first fixing part (120) vertically; and It includes a punch (300) that penetrates the punch hole (210) and is inserted into the forming hole (110). The above first fixed part (120) includes one or more first protrusions (122) and one or more first holes (124) that are formed alternately, The second fixing member (220) includes one or more second protrusions (222) that can be inserted into each of the one or more first holes (124), and one or more second holes (224) into which each of the one or more first protrusions (122) can be inserted. Battery case forming device.

2. In claim 1, The above first fixed part (120) is formed to extend along the side (S) of the above forming hole (110) or obliquely to the side (S), A battery case forming device in which the second fixing part (220) is formed along the first fixing part (120).

3. In claim 2, The above first fixed part (120) is formed to extend along the above side (S), and is a battery case forming device.

4. In claim 2 or claim 3, A battery case forming device, wherein the one or more first protrusions (122) and the one or more first holes (124) are alternately formed along the extension direction of the first fixing member (120).

5. In claim 4, A battery case forming device, wherein each of the first protrusion (122), each of the first hole (124), each of the second protrusion (222) and each of the second hole (224) is formed to extend along the extension direction of the first fixing member (120).

6. In claim 5, The lengths of the one or more first protrusions (122) are equal to each other, A battery case forming device, wherein the lengths of the one or more second protrusions (222) are the same.

7. In claim 5 or claim 6, A battery case forming device, wherein the total length of the one or more second protrusions (222) is greater than the total length of the one or more first protrusions (122).

8. In any one of claims 4 to 7, The end of each of the first protrusions (122) and the end of the inner surface of each of the first holes (124) adjacent to each of the first protrusions (122) are directly connected to each other, A battery case forming device in which the end of each of the second protrusions (222) and the end of the inner surface of each of the second holes (224) adjacent to each of the second protrusions (222) are directly connected to each other.

9. In any one of claims 2 to 8, A battery case forming device, wherein the section in which the first fixing part (120) is formed in the extension direction of the first fixing part (120) includes the entire section in which the side (S) is formed.

10. In any one of claims 2 to 9, The above-mentioned forming hole (110) includes a long side (S1) and a short side (S2) whose length is shorter than the long side (S1), The above-mentioned side (S) is the long side (S1), and the battery case forming device.

11. In claim 10, The above-mentioned forming hole (110) has a pair of the long sides (S1) located on one side and the other side, and a pair of the short sides (S2) connecting the two ends of the pair of the long sides (S1), respectively. The above die (100) includes a pair of first fixing parts (120) formed on one side and the other side of the pair of long sides (S1) with the pair of long sides (S1) interposed therebetween, respectively corresponding to the long side (S1) located on one side and the long side (S1) located on the other side, and extending along the corresponding long side (S1) or obliquely from the corresponding long side (S1), The above stripper (200) is a battery case forming device, which includes a pair of second fixing parts (220) formed along the pair of first fixing parts (120) and facing each other vertically with the pair of first fixing parts (120).

12. In any one of claims 2 to 11, The film (F) formed by the punch (300) and fixed under pressure by the stripper (200) at the upper portion of the die (100) has a bend line (L1) extending in the extension direction of the side (S) or extending in a direction oblique to the extension direction of the side (S). The above die (100) includes a pair of the first fixing parts (120) formed symmetrically with respect to the bending line (L1), The above stripper (200) is a battery case forming device, which includes a pair of second fixing parts (220) formed along the pair of first fixing parts (120) and facing each other vertically with the pair of first fixing parts (120).

13. In any one of claims 4 to 8, A battery case forming device in which the number of the first protrusions (122) is one greater or less than the number of the second protrusions (222).

14. In any one of claims 1 to 13, A battery case forming device in which the number of the second protrusions (222) is greater than the number of the first protrusions (122).

15. In claim 13, A battery case forming device wherein the number of the first protrusions (122) is 1 and the number of the second protrusions (222) is 2, or the number of the first protrusions (122) is 2 and the number of the second protrusions (222) is 1.

16. In claim 13 or claim 15, Each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222) and each of the second holes (224) are formed to extend along the side (S), A battery case forming device in which the length of each of the first protrusions (122) and the length of each of the second protrusions (222) are the same.

17. In any one of claims 2 to 13, claim 15 and claim 16, A transport section that transports a film (F) in the longitudinal direction, which is pressurized and fixed by the stripper (200) at the upper part of the die (100) and formed by the punch (300); and It further includes a cutting section that cuts a portion of the film (F) in the width direction in which the cup section (P1) is formed by the punch (300). The above side (S) is a side (S) on one side or the other side in the width direction of the above forming hole (110), A battery case forming device in which the first fixing member (120) is formed on the outside of the forming hole (110) in the width direction.

18. A cup portion (P1) having an internal space that protrudes in the thickness direction and accommodates an electrode assembly (52); and It includes a frame portion (P2) that surrounds and seals the above cup portion (P1) and has a predetermined portion (R), The above-mentioned portion (R) includes one or more first portions (R1) and one or more second portions (R2) that are formed alternately, Each of the above first portions (R1) is formed at least partially in one direction of the thickness, Each of the above second parts (R2) is formed to protrude toward the other side in the thickness direction than the edge part (P2) outside the above-mentioned portion (R). Battery case.

19. In claim 18, The above-mentioned portion (R) is formed together with the above-mentioned cup portion (P1), a battery case.

20. In claim 18 or claim 19, The above-mentioned portion (R) is formed to extend along the cup portion (P1) or obliquely from the cup portion (P1), A battery case, wherein the one or more first parts (R1) and the one or more second parts (R2) are formed alternately along the extension direction of the predetermined portion (R).

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