System and method for manufacturing battery cell packaging material

Abstract

A system and method for manufacturing battery cell packaging material are introduced, the system comprising: a press roll which presses and rolls a plate-shaped material and in which a concave portion extending along the circumference is formed, wherein, when the plate-shaped material is rolled, a convex portion is formed on the plate-shaped material by the concave portion; and a punching part which forms a recessed electrode installation groove in the plate-shaped material by applying pressure to and pressing on one point of the plate-shaped material, and which stretches the convex portion of the plate-shaped material to form a side surface of the electrode installation groove.

Description

Battery cell packaging material manufacturing system and manufacturing method

[0001] The present invention relates to a battery cell packaging material manufacturing system and manufacturing method that can improve the quality and rigidity of the packaging material when manufacturing the battery cell packaging material.

[0002] Recently, technologies for carbon reduction are being actively developed to address environmental issues such as extreme temperatures. To achieve this, energy must be produced using environmentally friendly methods rather than relying on fossil fuels. This energy must be stored as electricity, and the stored electricity must be used in vehicles, various industrial sites, and homes.

[0003] To utilize electric energy for carbon reduction, the use of batteries capable of storing and extracting electric energy is essential. Therefore, ensuring battery performance is essential to sufficiently store electric energy and ensure hassle-free use.

[0004] Batteries primarily utilize redox reactions of metal ions. To increase battery capacity, charge / discharge performance, and efficiency, high-density metal ions are used. Extensive research is also being conducted on electrolyte components and solid electrolytes. However, as battery performance advances, stability generally declines.

[0005] Batteries used in vehicles, industrial applications, and homes are manufactured as physical units called packs. Battery packs contain multiple battery cells within a sealed case, preventing fire from spreading to the outside in the event of a battery overheating or other accident. They also protect the internal battery cells from deterioration caused by the external environment or physical damage.

[0006] A battery pack contains multiple battery cells, housed in an intermediate form called a module or assembly (CMA, Cell Module Assembly). A battery module or assembly is composed of multiple battery cells assembled into a single module or assembly. These modules are then fastened within the pack case, completing the battery pack. Maintenance is facilitated by allowing maintenance to be performed on a module or assembly basis.

[0007] The multiple unit battery cells that make up a module or assembly are comprised of anodes, cathodes, and electrolytes. Because battery cells generate heat during charging and discharging, effective heat dissipation is essential. Furthermore, from the perspective of battery modules, assemblies, and battery packs, designing for efficient heat dissipation is essential to prevent safety accidents.

[0008] Meanwhile, battery cells are packaged using packaging materials that enclose and protect the electrodes. These packaging materials typically use films or panels made of materials like aluminum to reduce the weight of the battery cell and increase its energy density.

[0009] However, excessive molding during the film or panel molding process can result in bursts or defects at the edges of the packaging. Furthermore, such defects can sometimes be difficult to detect with the naked eye.

[0010] Therefore, in the process of manufacturing battery cell packaging materials, a technology was needed to improve the molding quality of the packaging materials and ensure sufficient rigidity.

[0011] The matters described as background technology above are only intended to enhance understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

[0012] The present invention has been proposed to solve such problems, and provides a battery cell packaging material manufacturing system and manufacturing method capable of stably forming a cell case while preventing cracks or tears from occurring in the plate-shaped material forming the battery cell case when the punching part presses the plate-shaped material forming the battery cell case in the battery cell packaging material manufacturing process.

[0013] The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0014] In order to achieve the above object, the battery cell packaging material manufacturing system according to the present invention comprises: a press roll that presses and rolls a plate-shaped material, forms a concave portion extending along a circumference, and forms a raised portion on the plate-shaped material through the concave portion when rolling the plate-shaped material; and a punching unit that presses and pushes a point of the plate-shaped material to form a sunken electrode installation groove in the plate-shaped material, and causes the raised portion of the plate-shaped material to extend and form a side surface of the electrode installation groove.

[0015] In the battery cell packaging material manufacturing system according to the present invention, the engraved portion of the press roll can be formed by recessing a point of the press roll toward the inside of the press roll.

[0016] In the battery cell packaging material manufacturing system according to the present invention, the engraved portion may be a ring shape extending along the outer circumference of the press roll.

[0017] In the battery cell packaging material manufacturing system according to the present invention, the press roll presses the plate-shaped material to reduce the thickness of the plate-shaped material, and a raised portion can be formed on the plate-shaped material at a point corresponding to the concave portion of the press roll.

[0018] In the battery cell packaging material manufacturing system according to the present invention, the engraved portions of the press roll can be formed in pairs at mutually spaced points on the outer surface of the press roll.

[0019] In the case of the battery cell packaging material manufacturing system according to the present invention, a pair of longitudinally raised portions extending in the longitudinal direction corresponding to a pair of concave portions may be formed on the plate-shaped material.

[0020] In the case of the battery cell packaging material manufacturing system according to the present invention, a pair of mutually spaced raised portions of the plate-shaped material may form a raised portion set, and each pair of raised portions of the raised portion set may form an facing side of an electrode installation groove.

[0021] In the battery cell packaging material manufacturing system according to the present invention, a plurality of sets of mutually spaced raised portions are formed on the plate-shaped material, a punching portion forms a plurality of electrode installation grooves on the plate-shaped material, and each of the plurality of sets of raised portions can form a side surface of a corresponding electrode installation groove.

[0022] In the case of the battery cell packaging material manufacturing system according to the present invention, a longitudinally raised portion is formed on the plate-shaped material through the engraving portion of the press roll, and the press roll can form a widthwise raised portion on the plate-shaped material through position or pressure control during the rolling process of the plate-shaped material.

[0023] In the case of the battery cell packaging material manufacturing system according to the present invention, the raised portion in the width direction of the plate-shaped material can be formed by moving the position of the press roll away from the plate-shaped material in some sections during the rolling process of the press roll or reducing the force pressing the plate-shaped material.

[0024] In the case of the battery cell packaging material manufacturing system according to the present invention, a pair of widthwise embossed portions are formed on the plate-shaped material at intervals in the lengthwise direction of the plate-shaped material, so that a pair of lengthwise embossed portions and a pair of widthwise embossed portions can form a square shape.

[0025] In the battery cell packaging material manufacturing system according to the present invention, the punching section forms an electrode installation groove by pressing a square point formed by a pair of longitudinal embossed portions and a pair of widthwise embossed portions, and the longitudinal embossed portions and the widthwise embossed portions can be extended to form a continuous side surface of the electrode installation groove.

[0026] In the battery cell packaging material manufacturing system according to the present invention, a pair of electrode installation grooves may be formed in the plate-shaped material, and a joint may be formed on the edge of the electrode installation groove.

[0027] In the battery cell packaging material manufacturing system according to the present invention, the joint portion can be formed along the outer periphery of the raised portion forming the electrode installation groove.

[0028] In the battery cell packaging material manufacturing system according to the present invention, the joint may be flat.

[0029] In the battery cell packaging material manufacturing system according to the present invention, the raised portion is pressed and stretched by the punching portion, and the raised portion can be formed with the thickest thickness at the point where it first comes into contact with the corner point of the punching portion.

[0030] In the case of the battery cell packaging material manufacturing system according to the present invention, the cross-sectional edge of the raised portion may have a streamlined curved shape.

[0031] In the case of the battery cell packaging material manufacturing system according to the present invention, a post-processing part for flattening the remaining raised portion existing on the outside of the electrode installation groove formed in the plate-shaped material may be further included.

[0032] In the case of the battery cell packaging material manufacturing system according to the present invention, a post-processing part may further be included for flattening the remaining raised portion existing on the outside of the raised portion forming the electrode installation groove among the raised portions formed on the plate-like material.

[0033] A method for manufacturing a battery cell packaging material according to the present invention comprises the steps of: supplying a plate-shaped material; pressing the supplied plate-shaped material through a press roll having a concave portion formed on the periphery thereof to form a raised portion on the plate-shaped material; and pressing the plate-shaped material having the raised portion formed thereon through a punching portion to form an electrode installation groove on the plate-shaped material, such that the raised portion forms a side surface of the electrode installation groove.

[0034] According to the battery cell packaging material manufacturing system and manufacturing method of the present invention, cracking or tearing of the plate-shaped material is prevented when the plate-shaped material is pressed by the punching unit in the battery cell packaging material manufacturing process, and at the same time, the battery cell case can be stably formed, thereby improving the stability of the battery cell packaging material and the upper system utilizing the same.

[0035] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0036] FIG. 1 is a drawing showing the inside of a pouch-type battery cell in one embodiment of the present invention.

[0037] Figure 2 is a drawing illustrating an electrode assembly in one embodiment of the present invention.

[0038] Figure 3 is a plan view of a pouch-type battery cell in one embodiment of the present invention.

[0039] Figures 4 and 5 are drawings showing a battery cell packaging material manufacturing system according to one embodiment of the present invention.

[0040] Fig. 6 is a drawing showing a punching section of a battery cell packaging material manufacturing system of the present invention.

[0041] Figure 7 is a drawing showing a case where a plate-shaped material of a battery cell packaging material manufacturing system of the present invention is pressed by a punching section.

[0042] Figure 8 is a drawing showing the process of forming a widthwise raised portion of the battery cell packaging material manufacturing system of the present invention.

[0043] Figure 9 is a drawing showing another embodiment of the process of forming a widthwise relief portion of the present invention.

[0044] Figures 10 to 14 are cross-sectional views showing various embodiments of a relief portion cut along line A-A' of Figure 3.

[0045] Fig. 15 is a drawing showing a post-processing section for removing the remaining relief portion of the battery cell packaging material manufacturing system of the present invention.

[0046] Fig. 16 is a drawing showing a plate-shaped material with the remaining relief portion removed according to the post-processing shown in Fig. 12.

[0047] FIG. 17 is a cross-sectional view of a battery cell packaging material manufactured according to a battery cell packaging material manufacturing system according to one embodiment of the present invention.

[0048] Figure 18 is a flowchart of a method for manufacturing a battery cell packaging material according to one embodiment of the present invention.

[0049] In describing the embodiments disclosed in this specification, detailed descriptions of related known technologies will be omitted if it is determined that such detailed descriptions may obscure the gist of the embodiments disclosed in this specification. In addition, the attached drawings are provided solely to facilitate understanding of the embodiments disclosed in this specification, and the technical concepts disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention.

[0050] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0051] In this specification, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0052] The suffixes "module" and "part" used for components in the following description are given or used interchangeably only for the convenience of writing specifications, and do not have distinct meanings or roles in themselves.

[0053] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0054] FIG. 1 is a drawing showing the inside of a pouch-type battery cell in one embodiment of the present invention, FIG. 2 is a drawing showing an electrode assembly in one embodiment of the present invention, FIG. 3 is a plan view of a pouch-type battery cell in one embodiment of the present invention, FIGS. 4 to 5 are drawings showing a battery cell packaging material manufacturing system according to one embodiment of the present invention, FIG. 6 is a drawing showing a punching unit of the battery cell packaging material manufacturing system of the present invention, FIG. 7 is a drawing showing a case where a plate-shaped material of the battery cell packaging material manufacturing system of the present invention is pressed by the punching unit, FIG. 8 is a drawing showing a process of forming a widthwise embossed portion of the battery cell packaging material manufacturing system of the present invention, FIG. 9 is a drawing showing another embodiment of a process of forming a widthwise embossed portion of the present invention, FIGS. 10 to 14 are cross-sectional views showing various embodiments of the embossed portion cut along the line A-A' of FIG. 3, and FIG. 15 is a drawing showing a process for removing a remaining embossed portion of the battery cell packaging material manufacturing system of the present invention. This is a drawing showing a post-processing part, and FIG. 16 is a drawing showing a plate-shaped material in a state where the remaining relief part has been removed according to the post-processing part shown in FIG. 15, and FIG. 17 is a cross-sectional view of a battery cell packaging material manufactured according to a battery cell packaging material manufacturing system according to an embodiment of the present invention, and FIG. 18 is a flowchart of a battery cell packaging material manufacturing method according to an embodiment of the present invention.

[0055] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components are given the same reference numbers and redundant descriptions thereof will be omitted.

[0056] Automotive batteries are manufactured by combining multiple battery cells into a single unit to protect them from external physical shocks and adapt to specific devices or environments. Specifically, batteries are structured by assembling multiple battery cells into modules or assemblies, and then connecting multiple modules to form a battery pack. Battery cells must have a high capacity per unit volume to maximize performance within the limited space within a vehicle. This high energy density improves vehicle driving range, charging time, and safety, making it crucial to design battery cells with high energy density.

[0057] High energy density in battery cells directly enhances the performance of the battery itself. Therefore, efforts are being made to efficiently stack battery cells in high-density battery cases. Battery cell cases are manufactured from battery cell packaging materials, and can be categorized into square, cylindrical, and pouch-shaped types based on the shape of the battery cell components they contain.

[0058] Before describing a battery cell packaging material manufacturing system according to an embodiment of the present invention, a battery cell (1000) will first be described.

[0059] FIG. 1 is a drawing showing the inside of a pouch-type battery cell in one embodiment of the present invention, FIG. 2 is a drawing showing an electrode assembly in one embodiment of the present invention, and FIG. 3 is a plan view of a pouch-type battery cell in one embodiment of the present invention.

[0060] In this embodiment, the battery cell (1000) may be a pouch-type battery cell (1000). However, the battery cell (1000) does not necessarily have to be provided in a pouch-type shape, and may be provided in a square shape, a cylindrical shape, or other various shapes.

[0061] In this embodiment, the battery cell (1000) includes an electrode assembly (1200) and a battery case (1100) that accommodates the electrode assembly (1200).

[0062] The above battery case (1100) is for accommodating an electrode assembly (1200) and may be a pouch-type battery case (1100).

[0063] In one embodiment of the present invention, the battery case (1100) includes a lower case (1110) and an upper case (1120) covering the lower case (1110), and the lower case (1110) and the upper case (1120) may be formed integrally. In addition, as illustrated in FIG. 1, the lower case (1110) and the upper case (1120) may be connected to each other, and the connecting portion of the lower case (1110) and the upper case (1120) may be formed in a structure in which the lower case (1110) and the upper case (1120) are bent and folded along a folding line (1190).

[0064] Both the lower case (1110) and the upper case (1120) may be formed of a laminate structure including an inner covering layer, a metal layer, and an outer covering layer.

[0065] In the battery case (1100), the inner covering layer is located on the inside of the battery case (1100) based on the metal layer, and since it comes into direct contact with the electrode assembly (1200), it must have insulation and electrolytic resistance. In addition, in order to seal it from the outside, the sealing portion where the inner layers are thermally bonded is required to have excellent thermal bonding strength.

[0066] Materials for such inner covering layers can be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene (PP), which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and chemical resistance, is most preferable.

[0067] The metal layer is located between the inner and outer covering layers and serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside. A preferred material for the metal layer in contact with the inner covering layer is a lightweight aluminum (Al) thin film with excellent formability.

[0068] The outer covering layer is located on the outside of the battery case (1100) based on the metal layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly (200) while ensuring heat resistance and chemical resistance. For example, nylon or polyethylene terephthalate can be used, but is not limited thereto.

[0069] A receiving groove (1130) may be formed in the lower case (1110) and / or the upper case (1120). The receiving groove (1130) is for receiving the electrode assembly (1200) inside the battery case (1100). The receiving groove (1130) of the upper case (1120) may be positioned above the receiving groove (1130) of the lower case (1110), and the electrode assembly (1200) may be accommodated within the receiving grooves (1130) of the upper and lower cases (1120, 1110).

[0070] In addition, a protective tape (1150) may be attached to each of the lower case (1110) and the upper case (1120). The protective tape (1150) protects the battery case (1100) from welding foreign matter generated when forming the welding portion (1230) of the electrode assembly (1200) and protects the battery case (1100) when forming a sealing portion by heat-welding the edges of the battery case (1100). The protective tape may be attached to each of the lower case (1110) and the upper case (1120).

[0071] In the lower case (1110) and the upper case (1120), the protective tape (1150) is attached to the edge portion of the lower case (1110) where the weld portion (1230) of the electrode assembly (1200) or the electrode leads (1231, 1232) are positioned. As illustrated in FIG. 2, the two electrode leads (1231, 1232) in the electrode assembly (1200) may extend in opposite directions, and the protective tape (1150) may be attached to each of the edges on both sides of the lower case (1110) and the upper case (1120) where the weld portion (1230) or the electrode leads (1231, 1232) are positioned.

[0072] Accordingly, a protective tape (1150) may be positioned on the edge of the upper case (1120) between the upper end of the receiving groove (1130) formed in the upper case (1120) and the upper end of the upper case (1120) and between the lower end of the receiving groove (1130) and the lower end of the upper case (1120), and the protective tape (1150) may have a larger area than the welded portion (1230) of the electrode assembly (200) on a plane.

[0073] The electrode assembly (1200) housed in the battery case (1100) may be one of a group consisting of a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped positive and negative electrodes and then rolled up, a stack type electrode assembly having unit cells having a structure in which rectangular positive and negative electrodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, and a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0074] In the present invention, the electrode assembly (1200) may include, for example, an electrode laminate (1210) as shown in FIG. 2, and a fixing tape (1220) for winding the electrode laminate (1210).

[0075] The electrode laminate (1210) may include a positive electrode (1211), a negative electrode (1213), and a separator (1212) disposed between the positive electrode (1211) and the negative electrode (1213), and may be formed in a form in which the length in the longitudinal direction of the electrode laminate (1210) is relatively longer than the length in the transverse direction.

[0076] The above-mentioned fixing tape (1220) is for fixing an electrode laminate (1210) in which a positive electrode (1211), a separator (1212), and a negative electrode (1213) are laminated, and is fixed by winding the outside of the electrode laminate (1210).

[0077] Additionally, the electrode assembly (1200) may include two electrode tabs (1201, 1202) and two electrode leads (1231, 1232).

[0078] The electrode tabs (1201, 1202) are formed by protruding outward from the electrode laminate (1210). One of the two electrode tabs (1201, 1202) may be a positive electrode tab connected (extended) to the positive electrode (1211), and the other electrode tab (1202) may be a negative electrode tab connected (extended) to the negative electrode (1213).

[0079] The electrode leads (1231, 1232) are connected to the electrode tabs (1201, 1202) and can be connected to the electrode tabs (1201, 1202) by welding. The material of the electrode leads (1231, 1232) can be used without any particular limitation as long as it is an electrically conductive material. For example, the material of the electrode leads (1231, 1232) can include at least one of copper (Cu), aluminum (Al), nickel (Ni), iron (Fe), carbon (C), chromium (Cr), and manganese (Mn). However, the electrode leads (231, 232) are not limited to the materials described above and can be selected in various ways in consideration of mechanical strength, flexibility, and processability.

[0080] For example, a certain portion of the electrode leads (1231, 1232) and the electrode tabs (1201, 1202) overlap each other vertically to form a welded portion (1230), and the electrode tabs (1201, 1202) and the electrode leads (1231, 1232) can be connected to each other by this welded portion (1230).

[0081] The formation of the weld (1230) can be achieved, for example, by ultrasonic welding. Ultrasonic welding rapidly forms a weld by applying high-frequency vibrations generated by high-frequency ultrasonic waves of approximately 20 kHz, whereby vibration energy is converted into thermal energy by friction at the interface between the electrode tabs (1201, 1202) and the electrode leads (1231, 1232). Furthermore, as another example, the weld (1230) can be formed by laser welding.

[0082] Among the two electrode leads (1231, 1232), one electrode lead (1231) may be a positive lead connected to the positive tab, and the other electrode lead (1232) may be a negative lead connected to the negative tab. The positive lead may be made of, for example, aluminum, and the negative lead may be made of, for example, copper or nickel-coated copper, but is not limited thereto.

[0083] The two electrode leads (1231, 1232) illustrated in FIG. 2 are shown as being arranged on both sides of the electrode assembly (1200), but may also be arranged on one side of the electrode assembly (1200) depending on the arrangement of the electrode tabs (1201, 1202). That is, when the two electrode tabs (1201, 1202) are arranged on one side of the electrode assembly (1200), the two electrode leads (1231, 1232) connected to the electrode tabs (1201, 1202) may also be formed in the same direction of the electrode assembly (1200).

[0084] As shown in Fig. 3, a lead film (1155) may be attached to each of the electrode leads (1231, 1232). The lead film (1155) attached to the electrode leads (1231, 1232) is positioned between the electrode leads (1231, 1232) and the battery case (1100) to prevent a short circuit from occurring between the electrode leads (1231, 1232) and the battery case (1100) and to improve sealing strength, thereby preventing leakage of the electrolyte, etc.

[0085] In one embodiment of the present invention, the remaining portion, excluding the folding portion where the lower case (1110) and the upper case (1120) constituting the battery case (1100) are connected, can be sealed by thermal compression.

[0086] That is, as shown in Fig. 3, a sealing portion (1160) may be placed for sealing in the remaining portion of the battery case (1100) except for the folding portion.

[0087] The sealing portion (1160) can be placed at the edge of the battery case (1100) and can be formed at the edge of the battery case (1100) excluding the folding portion (folding line (1190)).

[0088] Specifically, as illustrated in FIG. 3, the battery case (1100) may be formed in a roughly rectangular shape on a plane, and the battery case (1100) may have a pair of long sides (1101) spaced apart from each other and a pair of short sides (1102) spaced apart from each other. A pair of short sides (1102) may be arranged on the left and right sides of the battery case (1100) and a pair of long sides (1101) may be connected to each other.

[0089] Here, a folding line (1190) can be arranged on one long side (1101), and a sealing portion (1160) can be formed on the three sides (1101, 1102) excluding one side of the folding line (1190).

[0090] The present invention is for manufacturing a packaging material for packaging such a battery cell, and in the case of the present invention, it can be applied to manufacturing a packaging material for battery cells of all shapes such as square, cylindrical, and pouch types. In the present invention, the battery cell packaging material constituting the battery cell case uses a plate-shaped material (100), and the plate-shaped material (100) (pouch sheet) is made of a metal material and may require an insulating coating. In addition, the plate-shaped material (100) according to the present invention can be formed into a film shape in the case of a pouch-shaped cell, and can be formed and provided into a thin plate or panel shape in the case of a square or cylindrical cell.

[0091] In the case of batteries installed in vehicles, since performance in the event of a collision and secondary damage due to fire must also be prevented, the plate-shaped material (100) constituting the battery cell case can be formed of a metal material, and among metals, it can be made of aluminum, which is easy to form, light in weight, and has excellent durability.

[0092] Referring to FIGS. 4 to 7, the battery is manufactured by placing a plate-shaped material (100) (pouch sheet) forming a battery cell case on a mold, applying pressure using a punching section (500) to form a pair of electrode installation grooves (160) (corresponding to the receiving grooves (1130) in FIG. 1), inserting (stacking) a battery material (electrode assembly (1200)) into one of the formed electrode installation grooves (160), and then folding the remaining electrode installation grooves (160) so that the battery material (electrode assembly (1200)) overlaps the electrode installation grooves (160) into which it is inserted (stacking). In this case, the space other than the space occupied by the battery material (electrode assembly (1200)) in one electrode installation groove (160) is sealed along the joint (190) to prevent the battery material inside from being damaged by physical and chemical factors of the external environment.

[0093] The plate-like material (100) is a film or thin plate made of aluminum, and forms a battery cell case (battery case (1100)) including an electrode installation groove (160). When the plate-like material (100) is placed on a punching die (600) and then pressed using a punching unit (500), the plate-like material (100) is stretched to form an electrode installation groove (160). In the process of pressing using the punching unit (500), the plate-like material (100) generates maximum internal stress due to the pressing force at a portion (180) that comes into contact with the corner portion of the punching unit (500), and thus becomes thinner. Due to the thinned thickness, cracks or tears may occur in the plate-like material (100) itself. That is, since the plate-shaped material (100) is formed as a thin plate in the process of forming the battery cell case, there is a problem in that the thickness of the plate-shaped material (100) becomes thin when pressurized by the punching section (500).

[0094] The present invention forms a relief portion (120) on one or both sides of a plate-shaped material (100) by pressing the plate-shaped material (100) through a press roll (300) provided with a concave portion (320) during a battery cell case forming process, and the relief portion (120) is formed at a portion of the plate-shaped material (100) that comes into contact with a punching portion (500), so that even when the plate-shaped material (100) is pressed by the punching portion (500), the plate-shaped material (100) itself can be prevented from being cracked or torn due to the thickness of the relief portion (120).

[0095] In the illustrated embodiment, the present invention relates to a system and method for manufacturing a battery cell packaging material by processing a film-shaped plate-shaped material (100) for manufacturing a pouch-shaped cell. In the case of a pouch-shaped cell, since a very thin film or thin plate-shaped plate-shaped material (100) is used, it is difficult to ensure quality when stretched, and thus the present invention can be greatly effective when applied. However, the embodiment of the present invention can be applied not only to such pouch-shaped cells but also to cells of a square or cylindrical shape, and thus the scope of the present invention is not limited to a specific type of battery cell, but can be said to extend to all packaging technologies for packaging various types of battery cells.

[0096] Meanwhile, the packaging material manufacturing system of the present invention is provided with a press roll (300) having an extended engraved portion (320) formed along the circumference, and presses and rolls a plate-shaped material (100) to form a thick raised portion (120) on one or both sides of the plate-shaped material (100), and a punching unit (500) presses and presses a specific portion partitioned by a plurality of raised portions (120) to form a sunken electrode installation groove (160), and as a result, the pressed and elongated raised portion (120) forms a side surface of the electrode installation groove (160), thereby suggesting a battery cell packaging material manufacturing system that can prevent tearing or cracking of the plate-shaped material (100) during the process of forming the electrode installation groove (160) by the punching unit (500).

[0097] The press roll (300) of the present invention is provided with a concave portion (320) formed by recessing a point of the outer circumference toward the inside of the press roll (300) as shown in FIG. 4, and a plurality of such concave portions (320) may be formed in a ring shape extending along the circumference of the outer circumference of the press roll (300). The press roll (300) provided with the concave portion (320) presses the plate-like material (100) to reduce the thickness of the plate-like material (100), and a relief portion (120) is formed along the longitudinal direction of the plate-like material (100) at a point where the concave portion (320) of the press roll (300) moves on the plate-like material (100). The engraved portion (320) can be formed integrally with the press roll (300) during the manufacturing process of the press roll (300), and the engraved portion (320) can be formed through post-processing after manufacturing the press roll (300).

[0098] The engraved portions (320) of the press roll (300) can be formed as a pair at mutually spaced points on the outer surface of the press roll (300), and in this case, a pair of longitudinally relief portions (120) extending in the longitudinal direction of the plate-shaped material (100) corresponding to the pair of engraved portions (320) are formed on the plate-shaped material (100). The relief portions (120) formed by the engraved portions (320) of the press roll (300) on the plate-shaped material (100) are arranged to be spaced apart from each other, and two adjacent relief portions (120) form a pair to form one set of relief portions (120). A pair of positive portions (120) of a set of positive portions (120) are pressed by a punching portion (500) to form facing sides of an electrode installation groove (160) into which electrodes can be stacked (an electrode assembly (1200) can be inserted). A plurality of sets of positive portions (120) are formed in a plate-like material (100) by being spaced apart from each other by a press roll (300) in which a negative portion (320) is formed, and each set of positive portions (120) forms a side of an electrode installation groove (160). A pair of adjacent electrode installation grooves (160) can be folded and overlapped with respect to the boundary (170) between the two electrode installation grooves (160). In this way, a pair of electrode installation grooves (160) are folded and overlapped, and then sealed along the joint (190), thereby forming a battery cell case in which electrodes and main battery materials can be stacked.

[0099] The battery cell case can be manufactured using a plate-shaped material (100) such as an aluminum sheet. A pair of electrode installation grooves (160) are formed by pressing the plate-shaped material (100) using a punching part (500), and then electrodes (electrode assemblies (1200)) are placed in the electrode installation grooves (160). Thereafter, the remaining electrode installation grooves (160) are folded along the boundary (170) between the electrode installation grooves (160) containing the electrodes (electrode assemblies (1200)) and overlapped, and sealed along the joint (190), thereby completing the battery cell. In this case, the process of pressing the plate-shaped material (100) using the punching part (500) to form the electrode installation groove (160) is essential in the process of forming the battery cell case. However, the thin plate of the plate-shaped material (100) cannot withstand the strong pressing force of the punching part (500) and, during the stretching process, the stretching part (180), which is the part that comes into contact with the corner of the punching part (500), is frequently torn or cracked.

[0100] Therefore, by forming a raised portion (120) having a thickness on one or both sides of the plate-shaped material (100) in advance before pressurizing the plate-shaped material (100) by the punching portion (500), it is possible to prevent the elongated portion (180) of the plate-shaped material (100) from being torn or cracked even when pressed by the punching portion (500). The battery cell case is formed by two electrode installation grooves (160) being folded and overlapped along the boundary (170) between the two electrode installation grooves (160), and since the electrode installation groove (160) is formed by a bottom surface on which the electrodes are laminated and a side surface surrounding the bottom surface, the raised portion (120) must be located at a point corresponding to the side surface of the electrode installation groove (160), which is the elongated portion (180) in the plate-shaped material (100). Therefore, the relief (120) must be formed not only in the longitudinal direction of the plate-shaped material (100) but also in the width direction.

[0101] In the case of the electrode installation groove (160) of the battery cell case, since it has a bottom surface where electrodes can be stacked and a side surface surrounding the bottom surface, the raised portion (120) on the plate-like material (100) must be formed not only in the longitudinal direction but also in the width direction. The width-direction raised portion (140) can be formed by controlling the position of the press roll (300) moving along the longitudinal direction of the plate-like material (100) as shown in FIG. 8. This position control of the press roll (300) is possible by moving the press roll (300) away from the plate-like material (100) at a point forming the side surface of the battery cell case while moving along the longitudinal direction of the plate-like material (100), forming the raised portion (140) of the desired size, and then moving the press roll (300) again toward the plate-like material (100) to apply pressure. By controlling the position of the press roll (300), a widthwise embossed portion (140) intersecting with the lengthwise embossed portion (120) is formed at a desired position on one or both sides of the plate-shaped material (100), and the formed lengthwise embossed portion (120) and widthwise embossed portion (140) are pressed by the punching unit (500), thereby forming the side surface of the electrode installation groove (160).

[0102] In the case of the width-direction relief portion (140), it can also be formed by controlling the pressing force of the press roll (300) as shown in Fig. 8. Since the press roll (300) presses and rolls the plate-like material (100), the thickness of the plate-like material (100) can be adjusted by increasing or decreasing the pressing force of the press roll (300) at one point of the plate-like material (100). The pressing force control of the press roll (300) is performed by lowering the pressing force of the press roll (300) at a point where the relief portion (140) on the plate-like material (100) is desired to be formed, thereby forming a relief portion (140) with a thicker thickness of the plate-like material (100), and then increasing the pressing force of the press roll (300) again to press the plate-like material (100) by repeating the action.

[0103] As shown in the solid line in Fig. 8, the press roll (300) that presses and rolls the plate-like material (100) controls the displacement or pressing force of the press roll (300) at a point where the formation of the widthwise embossed portion (140) on the plate-like material (100) is desired through position control or pressing force control, thereby forming the widthwise embossed portion (140) and then continuing to press and roll the plate-like material (100) in the same direction as the dotted line shown in Fig. 8. In this manner, it is possible to form a plurality of widthwise embossed portions (140) on one or both sides of the plate-like material (100).

[0104] In addition, as shown in Fig. 9, a relief portion (140) may be formed in the width direction of the plate-shaped material (100) by forming a relief portion (340) along the longitudinal direction of the press roll (300) in a direction intersecting with the relief portion (320) formed along the outer circumference of the press roll (300). In this case, the spacing between the relief portions (140) in the width direction of the plate-shaped material (100) is adjusted according to the circumference of the press roll (300), so that as the circumference of the press roll (300) increases, the spacing between the relief portions (140) in the width direction also becomes wider. Since the width-wise relief portion (140) forms the side surface of the electrode installation groove (160), it is reasonable for it to have the same thickness as the length-wise relief portion (120). However, in some cases, the thicknesses of the width-wise relief portion (140) and the length-wise relief portion (120) may be different to manufacture electrode installation grooves (160) of various shapes.

[0105] Referring to FIG. 6, the plate-shaped material (100) is placed on a punching die (600) and pressed by a punching unit (500) when forming an electrode installation groove (160). The punching die (600) is provided to form the electrode installation groove (160) when the plate-shaped material (100) is pressed by the punching unit (500). Since the height of the electrode installation groove (160) can be determined depending on the height of the punching die (600), it is important to select an appropriate punching die (600) considering the capacity of the battery material and the battery cell. As illustrated, the punching die (600) can form a pair of electrode installation grooves (160) by using two large punching dies (600) located on both sides and a relatively small-sized punching die (600) located between them. When a small punching die (600) is used as a boundary, it is easy to form electrode installation grooves (160) of uniform size on both sides, and the plate-shaped material (100) can be maintained in an extended state without being bent in the center due to the small punching die (600) that supports the plate-shaped material (100) in the center, so that the electrode installation grooves (160) can be formed without being twisted or bent even when pressurized by the punching unit (500). Of course, by increasing the number of punching dies (600), a larger number of electrode installation grooves (160) can be secured, and the position of the punching die (600) can be adjusted to make the sizes of a plurality of electrode installation grooves (160) different from each other.

[0106] A press roll (300) having a plurality of engraved portions (320) formed thereon may be provided as a pair, as shown in FIG. 4, to contact both sides of the plate-shaped material (100) with respect to the plate-shaped material (100) in order to more effectively control the thickness of the plate-shaped material (100). A pair of press rolls (300, 300') provided on both sides of the plate-shaped material (100) may form a relief portion (120) at a point where they overlap each other in the plate-shaped material (100) by pressing and rolling the plate-shaped material (100) in the same direction, as shown in FIG. 13. Compared to forming the relief portion (120) on one side of the plate-like material (100), by forming the relief portion (120) on the overlapping portion on both sides of the plate-like material (100), the thickness of the relief portion (120) corresponding to the elongated portion (180) that is vulnerable to cracking and tearing when forming the electrode installation groove (160) on the plate-like material (100) can be secured to be thicker, so that the plate-like material (100) can be more reliably prevented from being cracked or torn when elongating the plate-like material (100) due to the pressure of the punching portion (500).

[0107] A pair of press rolls (300, 300') arranged to be in contact with each other on both sides of a plate-like material (100) may be arranged so that both press rolls (300, 300') have the same shape and material. In this case, each of the pair of press rolls (300, 300') includes an engraved portion (320) of the same shape, and by pressing and rolling both sides of the plate-like material (100), a raised portion (120) that overlaps at the same point on the plate-like material (100) and has the same shape can be formed, as shown in FIG. 13. Alternatively, the engraved portion (320) may be formed on only one press roll (300) of the pair of press rolls (300, 300'). In this case, the plate-shaped material (100) is rolled by applying pressure from the press roll (300) on which the negative portion (320) is formed, thereby forming a relief portion (120). In the case of the press roll (300') on which the negative portion (320) is not formed, the plate-shaped material (100) is pressed without forming the positive portion (120). A pair of press rolls (300, 300') may press the same point on the plate-shaped material (100), but may also be spaced apart from each other as in FIG. 14 to press different points and form relief portions (120) on both sides. When the negative portions (320) are formed on both of the press rolls (300, 300') and each negative portion (320) has a different shape, relief portions (120) of different shapes may be formed on both sides based on the plate-shaped material (100).

[0108] When a pair of press rolls (300, 300') are provided on both sides of a plate-like material (100), only the press roll (300) on one side of the plate-like material (100) performs pressing and rolling, and the press roll (300') on the opposite side does not press and roll the plate-like material (100), but only plays a role of supporting the press roll (300) that presses the plate-like material (100). In this case, as shown in FIGS. 10 to 12, a relief portion (120) is formed only on one side that directly presses and rolls the plate-like material (100), and in the case of a press roll (300') that simply supports the plate-like material (100), a relief portion (120) is not formed.

[0109] In addition, rather than having a pair of press rolls (300, 300') provided on both sides of the plate-shaped material (100) directly press the plate-shaped material (100), the plate-shaped material (100) may be pressed by itself while moving directly between a pair of press rolls (300, 300') provided with an engraved portion (320), thereby forming a raised portion (120) on one or both sides of the plate-shaped material (100). As the plate-shaped material (100) passes between a pair of fixed press rolls (300, 300'), the pair of press rolls (300, 300') rotate in place without moving and press the plate-shaped material (100), so that a relief portion (120) is formed on one or both sides of the plate-shaped material (100) by the engraved portion (320) provided on the pair of press rolls (300, 300').

[0110] Referring to FIG. 5, the battery cell packaging material manufacturing system of the present invention may include a press roll (300) that forms a relief portion (120) on one or both sides of the plate-shaped material (100) through a portion where a negative portion (320) is formed by pressing and rolling the plate-shaped material (100), in addition to a preceding press roll (400). In the case of the preceding press roll (400), it is positioned in front of the press roll (300) where the negative portion (320) is formed, and performs a flattening operation that flattens a bent or wrinkled portion existing on the plate-shaped material (100) by first pressing and rolling the plate-shaped material (100). The preceding press roll (400) may also exist on both sides with respect to the plate-shaped material (100), and a pair of preceding press rolls (400, 400') existing on both sides move the plate-shaped material (100) in the same direction to perform the flattening operation.

[0111] In the case of the preceding press roll (400), since the negative portion (320) is not formed, the positive portion (120) is not formed on the plate-shaped material (100) by the preceding press roll (400), and the subsequent press roll (300) on which the negative portion (320) is formed serves to straighten the plate-shaped material (100) so that an accurate and uniform positive portion (120) can be formed on the plate-shaped material (100). However, if the preceding press roll (400) presses the plate-like material (100) too strongly, the thickness of the plate-like material (100) may become thin, making it difficult for the subsequent press roll (300) on which the negative portion (320) is formed to form the positive portion (120) on one or both sides of the plate-like material (100). Therefore, it is preferable to adjust the pressing force of the preceding press roll (400) to be lower than that of the subsequent press roll (300) so that it can focus on its role of making the wrinkles or folded portions existing in the plate-like material (100) flat.

[0112] The relief portion (120) formed on one or both sides of the plate-like material (100) is stretched by being pressed by the punching portion (500) as shown in FIG. 7, and the relief portion (120) is formed so that the thickness of the stretching portion (180), which is the point that first comes into contact with the corner point of the punching portion (500), is the thickest, thereby preventing cracking and tearing of the plate-like material (100). Specifically, the cross-sectional shape of the relief portion (140) can be a trapezoidal shape with curved side ends as shown in FIG. 11, and the side ends of the trapezoidal shape can be formed with the radius of curvature of the press roll (300). Since the circular press roll (300) presses and rolls the plate-shaped material (100), the side ends of the trapezoid are formed in a streamlined shape rather than a straight line, and the press roll (300) exerts a constant pressing force on the upper surface of the raised portion (120) to form a flat plane. Of course, if it is necessary to adjust the side thickness of the electrode installation groove (160), the size of the raised portion (120) can be made smaller or larger, and in some cases, the raised portion (120) may have various shapes such as an arc as well as a streamlined shape at the side ends of the cross-section.

[0113] In addition, the relief portion (120, 140) of the plate-like material (100) may not necessarily have a symmetrical shape, but may also have an asymmetrical streamlined shape, as in FIG. 11 or FIG. 12. Since the relief portion (120, 140) is stretched the most at the point (180) that first contacts the corner point of the punching portion (500), cracking or tearing of the plate-like material (100) frequently occurs. Accordingly, the relief portion (120, 140) of the stretching portion (180), which is the part that first contacts the corner point of the punching portion (500), may be formed to be the thickest, and the remaining portions may be formed to have a shape in which the thickness gradually decreases, thereby forming an asymmetrical relief portion (120, 140). In the case of Fig. 11, the part (180) that comes into direct contact with the punching part (500) is formed on the far side from the electrode installation groove (160), so that when the electrode installation groove (160) is pressed, the thick raised part (120, 140) is pressed toward the side of the raised part (120, 140) with a gentle slope, thereby forming the side of the electrode installation groove (160). Conversely, in the case of Fig. 12, the part (180) pressed by the electrode installation groove (160) is the thickest part of the raised part (120, 140), so that when pressed by the punching part (500), the part (180) is pressed toward the side with a steep slope of the raised part (120, 140), thereby forming the side of the electrode installation groove (160).

[0114] In the case of an asymmetrical relief portion (120, 140), it can be formed through gradual position control or pressure control of the press roll (300), and the thick part of the relief portion (120, 140) can be formed in a desired direction or position, thereby simplifying the manufacturing process and providing an economical solution to cracking or tearing of the plate-like material (100).

[0115] Meanwhile, when press rolls (300, 300') are provided on both sides of the plate-like material (100), the relief portions (120, 140) may be formed on both sides of the plate-like material (100) as shown in FIG. 13 or FIG. 14. In this case, the relief portions (120, 140) may be formed to overlap with each other at the same point on both sides of the plate-like material (100) with the same size, as shown in FIG. 13, or may be formed to overlap with only some points on the opposing sides of the plate-like material (100) as shown in FIG. 14, or may be overlapped with different shapes on both sides of the plate-like material (100) depending on the shape of the engraved portions (320) provided on the press rolls (300, 300'). In addition, by having a pair of press rolls (300, 300') press and roll both sides of the plate-like material (100) at different points, a relief portion (120) may be formed at an adjacent point without overlapping each other on the plate-like material (100) by the engraved portion (320) provided on the press rolls (300, 300'). In addition, by controlling the position or pressure of the press rolls (300, 300'), the relief portion (120) may be formed in an asymmetrical streamlined shape so as to overlap or be adjacent to each other on both sides of the plate-like material (100).

[0116] When the plate-like material (100) is formed into a battery cell case, the part (180) that is most vulnerable to cracking and tearing is the point where the elongation is the greatest and forms the side of the battery cell case. Therefore, by thickening the raised part (120) corresponding to the elongation part (180) among the asymmetrical streamlined shapes, even if the plate-like material (100), which is an aluminum thin plate, is elongated by the punching part (500), the phenomenon of cracking or tearing can be prevented.

[0117] The shape of the above relief portion (120) and the embodiments of FIGS. 10 to 14 describe the cross-section (A-A') of the longitudinal relief portion (120) shown in FIG. 6, but can be applied to not only the longitudinal relief portion (120) but also the widthwise relief portion (140). The longitudinal relief portion (120) can have various relief portion (120) shapes by forming the negative portion (320) into various shapes when forming it on the press roll (300), and in the case of the widthwise relief portion (140), it can be formed into various shapes as shown in FIGS. 10 to 14 through position control of the press roll (300), pressure control, forming of the negative portion (340) formed along the longitudinal direction of the press roll (300), etc. Therefore, if the relief portion (120, 140) is formed so that the thickness of the elongated portion (180) corresponding to the punching portion (500) is the thickest, relief portions (120, 140) of various shapes can also be formed.

[0118] A pair of widthwise embossed portions (140) are formed at mutually spaced points on the plate-like material (100), so that a pair of lengthwise embossed portions (120) and a pair of widthwise embossed portions (140) form a square shape, and a punching unit (500) presses the square point formed by the lengthwise embossed portions (120) and the widthwise embossed portions (140) on the plate-like material (100) to form an electrode installation groove (160). In one electrode installation groove (160), a side surface is formed by pressing the lengthwise embossed portions (120) and the widthwise embossed portions (140), thereby forming a continuous side surface surrounding the bottom surface on which the electrodes are laminated. The continuous side surface of the electrode installation groove (160) is an elongation portion (180), which is a portion where the greatest elongation occurs when pressing is performed by the punching unit (500). By configuring the portion corresponding to the extension portion (180) as a longitudinal relief portion (120) and a widthwise relief portion (140), the extension portion (180) can secure sufficient thickness. Accordingly, even if the plate-like material (100) is pressed by the punching portion (500), the phenomenon of cracks or tears occurring in the plate-like material (100) can be prevented, thereby forming a side surface of a stable electrode installation groove (160).

[0119] In the plate-like material (100), a pair of widthwise relief portions (140) are spaced apart from each other in the longitudinal direction of the plate-like material (100), and a pair of lengthwise relief portions (120) are spaced apart from each other in the width direction of the plate-like material (100). Therefore, due to the intersection of the plurality of lengthwise relief portions (120) and the plurality of widthwise relief portions (140), a plurality of square-shaped electrode installation grooves (160) are formed, and adjacent pairs of electrode installation grooves (160) are bent and overlapped with each other along the boundary (170) therebetween to form a single battery cell case. In the case of a boundary (170) existing between a pair of electrode installation grooves (160), it exists at a point between a pair of adjacent electrode installation grooves (160) as in FIG. 15 or FIG. 16, and may exist between the most adjacent raised portions (120) between the two electrode installation grooves (160) as illustrated. In this case, a pair of raised portions (120) are directly pressed by the punching portion (500) to form the side surface of the electrode installation groove (160), so that a pair of electrode installation grooves (160) can be folded based on the boundary (170) and overlap each other as in FIG. 17. In addition, as in FIG. 5 or FIG. 6, a boundary (140') between a pair of electrode installation grooves (160) may exist on a widthwise raised portion (140). In this case, the inter-boundary (140') exists together with the widthwise relief portion (120) as shown, and a pair of electrode installation grooves (160) are folded and overlapped based on the inter-boundary (140'), and the widthwise relief portion (140) must form the side of the electrode installation groove (160). Therefore, in the case of the widthwise relief portion (140) including the inter-boundary (140'), it has a shape that is sufficiently thick and has a high height compared to other widthwise relief portions (140) in order to smoothly perform the role of the inter-boundary (140') of both electrode installation grooves (160) even after pressurization by the punching portion (500).

[0120] In addition, in the case of the side boundary (140') shown in FIG. 5 or FIG. 6, it exists on the width-direction relief portion (140), but in some cases, it exists on the length-direction relief portion (120), and a pair of electrode installation grooves (160) can be bent based on this and overlap each other.

[0121] In the plate material (100), a plurality of widthwise relief portions (140) and a plurality of lengthwise relief portions (120) intersect each other to form a plurality of electrode installation grooves (160), and two adjacent electrode installation grooves (160) form a pair to form a battery cell case. As shown in Fig. 17, a pair of electrode installation grooves (160) have the same shape and are folded and overlapped based on the boundary (170) and sealed along the joint (190) to form a battery cell case.

[0122] In this case, a joint (190) is formed on the edge of the electrode installation groove (160), and this joint (190) is formed along the outer periphery of the raised portion (120) that forms the side of the electrode installation groove (160). The joint (190) is a part that is sealed to prevent damage to the battery by external physical impact or internal environment when a pair of electrode installation grooves (160) overlap each other, and therefore must be bonded without spacing from each other, and is thus configured as a flat surface. Since the joints (190) must be bonded without spacing from each other, the remaining embossed portions (150) except for the embossed portions (120) that are pressed by the punching portion (500) on one or both sides of the plate-like material (100) to form the electrode installation grooves (160) must be removed, and once these remaining embossed portions (150) are removed, the flat joint (190) is secured more widely, so that when a pair of electrode installation grooves (160) are folded and overlapped through the intervening boundary (170) and sealed along the joint (190), the battery cell case can be assembled without a spaced portion. When a pair of electrode installation grooves (160) are sealed along the joint (190), they can be combined in various ways, such as bonding or mechanical fastening.

[0123] The plate-like material (100) is pressed and stretched by the punching unit (500) to form one electrode installation groove (160), and two of the electrode installation grooves (160) formed in this way form a pair to form a battery cell case. The electrode installation grooves (160) are manufactured to have the same size with a certain point as the boundary on one plate-like material (100) as the boundary, and have the shape of a bottom surface on which electrodes are laminated and a side surface surrounding the bottom surface. The electrode installation grooves (160) formed by pressing by the punching unit (500) are folded and overlapped along the boundary, and the portions excluding the portions containing the electrodes are sealed along the joint (190) to complete one battery cell. Since the two electrode installation grooves (160) formed in the plate-like material (100) must be folded along the boundary (170) provided therebetween and then overlapped and sealed, the remaining relief portions (150) except for the relief portions (120) forming the sides of the electrode installation grooves (160) must be removed in terms of assembly stability.

[0124] When the formation of the raised portion (120) by the press roll (300) is completed for the plate-shaped material (100) for forming the electrode installation groove (160), a plurality of intersecting raised portions (120, 140) are formed in the longitudinal and width directions of the plate-shaped material (100). Among the intersecting raised portions (120, 140), the raised portions (120, 140) that are pressed and stretched by the punching portion (500) to form the side surface of the electrode installation groove (160) except for the raised portions (120, 140) existing on the outer side of the electrode installation groove (160) are residual raised portions (150), and when a pair of electrode installation grooves (160) are folded along the boundary between them and then overlapped to be sealed along the joint (190), they may interfere with each other and must therefore be removed. In this case, the battery cell packaging material manufacturing system of the present invention further includes a post-processing part (700) for flattening the remaining relief part (150) existing on the outside of the electrode installation groove (160) formed on the plate-like material (100), so that the electrode installation groove (160) can be formed first and then the remaining relief part (150) can be flattened, or the post-processing part (700) for flattening the remaining relief part (150) existing on the outside of the relief part (120) forming the electrode installation groove (160) among the relief parts (120) formed on the plate-like material (100) can be further included, so that before forming the electrode installation groove (160), the remaining relief part (150) can be removed in advance and then the relief part (120) can be pressed by the punching part (500), thereby forming the electrode installation groove (160).

[0125] In the case of the post-processing part (700), as a post-processing step for removing the residual relief part (150), the residual relief part (150) can be removed by pressing and rolling with a roller, the residual relief part (150) can be removed by pressing with a press, the residual relief part (150) can be removed by cutting with a cutting machine, the residual relief part (150) can be removed with a laser device, or the residual relief part (150) can be removed using a tool that elongates the plate-like material (100) itself, etc., and various other methods can be used to remove the residual relief part (150).

[0126] As one embodiment of the post-processing part (700), the remaining relief part (150) can be removed through a separately provided roller as in Fig. 15. The roller can remove the remaining relief part (150) regardless of before or after the formation of the electrode installation groove (160), and can remove the remaining relief part (150) existing on one or both sides of the plate-like material (100) by pressing and rolling, targeting the relief part (150) excluding the relief part (120) that is pressed by the punching part (500) and directly forms the side surface of the electrode installation groove (160). In this case, after the formation of the electrode installation groove (160) is completed, a pair of electrode installation grooves (160) must be folded and overlapped through the boundary (170) between them and sealed along the joint (190). Therefore, in the case of the roller, it is reasonable to apply pressure according to the thickness of the part of the plate-like material (100) where the relief portion (120) is not formed when removing the residual relief portion (150). In addition, in the case of the roller, a plurality of rollers may be provided according to the size of the residual relief portion (150), and the residual relief portion (150) may be removed by directly moving the roller, or the roller may not be moved and the point where the residual relief portion (150) is formed may be removed by directly moving the plate-like material (100).

[0127] In addition to the roller, the remaining embossed portion (150) can be removed by applying pressure to a post-processing press toward the embossed portion (120) on the plate-like material (100) using a press that covers a part or the entire surface of the plate-like material (100), which is another embodiment of the post-processing portion (700). In order to remove only the remaining embossed portion (150) of the plate-like material (100), a post-processing press that removes only the remaining embossed portion (150) excluding the embossed portion (120) forming the side surface of the electrode installation groove (160) can be provided to apply pressure to the remaining embossed portion (150) of the plate-like material (100). Alternatively, after forming the electrode installation groove (160) in advance by the punching portion (500), the press can be used to apply pressure to remove the remaining embossed portion (150) existing on one surface of the plate-like material (100).

[0128] As another embodiment of the post-processing part (700), the residual relief part (150) may be removed using a cutting machine to remove only the residual relief part (150) from one side of the plate-like material (100). In this case, before forming the electrode installation groove (160), the part corresponding to the residual relief part (150) may be directly cut using a cutting machine, or after forming the electrode installation groove (160) in advance, all residual relief parts (150) existing on one side of the plate-like material (100) may be cut and removed. Of course, in addition to this, there are various methods for removing the remaining relief portion (150) in the post-processing section (700), such as a separate laser device or a tool for elongating the plate-like material (100), and as the remaining relief portion (150) is removed, a pair of electrode installation grooves (160) are formed, and then folded along the boundary (170) and overlapped to seal along the joint (190), so that the two electrode installation grooves (160) can be stably fastened without any gaps.

[0129] Fig. 18 is a flowchart of a method for manufacturing a battery cell packaging material according to an embodiment of the present invention. The method for manufacturing a battery cell packaging material of the present invention first performs a step (S100) of supplying a plate-shaped material (100). The plate-shaped material (100) may be a pouch sheet as described above, or may be in the shape of a film, thin plate, or panel. Thereafter, a step (S300) of forming a raised portion (120) on the plate-shaped material (100) by pressing the supplied plate-shaped material (100) through a press roll (300) having an engraved portion (320) formed around the periphery thereof is performed. And, a step (S500) is performed in which the plate-shaped material (100) on which the relief portion (120) is formed is pressed by the punching portion (500) to form an electrode installation groove (160) in the plate-shaped material (100), such that the relief portion (120) forms a side surface of the electrode installation groove (160). Since the specific manufacturing process in each process has been sufficiently described above, a detailed description thereof is omitted.

[0130] Meanwhile, the battery cell packaging material manufacturing system according to the present invention can be applied to manufacturing packaging materials for battery cells applied to battery packs of various vehicles, such as internal combustion engine vehicles, electric vehicles, hybrid vehicles, and fuel cell vehicles, and can also be applied to manufacturing packaging materials for battery cells applied to battery packs of various fields, such as industrial ESS (Energy Storage System), household ESS, and small battery packs, in addition to vehicles.

[0131] Although the present invention has been illustrated and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the invention as defined by the following claims.

[0132] The present invention can provide a battery cell packaging material manufacturing system and manufacturing method that can prevent cracking or tearing of a plate-shaped material when the plate-shaped material is pressed by a punching unit in a battery cell packaging material manufacturing process, and at the same time stably form a battery cell case.

Claims

1. A press roll that presses and rolls a plate-shaped material, forms a concave portion extending along the circumference, and forms a relief portion on the plate-shaped material through the concave portion when rolling the plate-shaped material; and A battery cell packaging material manufacturing system comprising a punching unit that presses and presses a point of the plate-like material to form a sunken electrode installation groove in the plate-like material, and causes the raised portion of the plate-like material to elongate and form a side surface of the electrode installation groove.

2. In claim 1, A battery cell packaging material manufacturing system characterized in that the engraved portion of the press roll is formed by a point of the press roll being recessed toward the inside of the press roll.

3. In claim 2, A battery cell packaging material manufacturing system characterized in that the above-mentioned engraved portion is a ring shape extending along the outer circumference of the press roll.

4. In claim 1, A battery cell packaging material manufacturing system characterized in that the press roll presses the plate-shaped material to reduce the thickness of the plate-shaped material, and the plate-shaped material has the raised portion formed at a point corresponding to the concave portion of the press roll.

5. In claim 1, A battery cell packaging material manufacturing system characterized in that the engraved portion of the press roll is formed in a pair at mutually spaced points on the outer surface of the press roll.

6. In claim 5, A battery cell packaging material manufacturing system characterized in that a pair of longitudinally raised portions extending in the longitudinal direction corresponding to a pair of concave portions are formed on the above plate-shaped material.

7. In claim 6, A battery cell packaging material manufacturing system, characterized in that the above plate material comprises a pair of mutually spaced raised portions forming a raised portion set, and each pair of raised portions of the raised portion set forms an opposing side of the electrode installation groove.

8. In claim 7, A battery cell packaging material manufacturing system characterized in that a plurality of sets of mutually spaced raised portions are formed on the plate-like material, the punching portion forms a plurality of electrode installation grooves on the plate-like material, and each set of the plurality of raised portions constitutes a side surface of a corresponding electrode installation groove.

9. In claim 1, A battery cell packaging material manufacturing system characterized in that the plate-shaped material has a longitudinally raised portion formed through the engraved portion of the press roll, and the press roll forms a widthwise raised portion on the plate-shaped material through position or pressure control during the rolling process of the plate-shaped material.

10. In claim 9, A battery cell packaging material manufacturing system, characterized in that the raised portion in the width direction of the plate-shaped material is formed by moving the position of the press roll away from the plate-shaped material in some sections during the rolling process of the press roll or by reducing the force pressing the plate-shaped material.

11. In claim 9, A battery cell packaging material manufacturing system characterized in that a pair of widthwise embossed portions are formed spaced apart from each other in the longitudinal direction of the plate-shaped material, so that a pair of lengthwise embossed portions and a pair of widthwise embossed portions form a square shape.

12. In claim 11, A battery cell packaging material manufacturing system characterized in that the punching part forms the electrode installation groove by pressing a square point formed by a pair of longitudinal embossed portions and a pair of widthwise embossed portions, and the longitudinal embossed portion and the widthwise embossed portion are elongated to form a continuous side surface of the electrode installation groove.

13. In claim 1, A battery cell packaging material manufacturing system characterized in that a pair of electrode installation grooves are formed in the above plate-shaped material, and a joint is formed on the edge of the electrode installation groove.

14. In claim 13, A battery cell packaging material manufacturing system characterized in that the above joint is formed along the outer periphery of the raised portion forming the electrode installation groove.

15. In claim 13, A battery cell packaging material manufacturing system characterized in that the above joint forms a plane.

16. In claim 1, A battery cell packaging material manufacturing system, characterized in that the above-mentioned raised portion is pressed and stretched by the punching portion, and the above-mentioned raised portion is formed with the thickest thickness at the point where it first comes into contact with the corner point of the punching portion.

17. In claim 16, A battery cell packaging material manufacturing system characterized in that the cross-sectional edge of the above-mentioned raised portion has a streamlined curved shape.

18. In claim 1, A battery cell packaging material manufacturing system characterized by further including a post-processing part for flattening the remaining relief portion existing on the outside of the electrode installation groove formed in the plate-like material.

19. In claim 1, A battery cell packaging material manufacturing system characterized by further including a post-processing part for flattening the remaining raised portion existing on the outside of the raised portion forming the electrode installation groove among the raised portions formed on the plate-like material.

20. Step of supplying plate materials; A step of forming a relief portion on the plate-like material by pressing the supplied plate-like material through a press roll having a concave portion formed around the periphery; and A method for manufacturing a battery cell packaging material, comprising: a step of forming an electrode installation groove in the plate-shaped material by pressing the plate-shaped material on which the raised portion is formed with a punching portion, such that the raised portion forms a side surface of the electrode installation groove.

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