Apparatus for notching secondary battery electrode and metohd for notching secondary battery electrode using the same

Abstract

The present disclosure relates to an electrode notching device for a secondary battery and a method for electrode notching for a secondary battery using the same. The technical problem to be solved is to provide a mold structure capable of controlling suction force by adjusting the area of ​​the discharge hole in order to efficiently remove scrap and foreign substances generated during the electrode notching process for a secondary battery, thereby increasing the cleanliness of the process and improving the quality of the product. To this end, the present disclosure provides an electrode notching device for a secondary battery, comprising: an upper mold installed to be movable in the vertical direction and equipped with a punch for electrode notching; a lower mold located at the bottom of the upper mold and equipped with a die plate having a die hole corresponding to the punch, wherein an electrode for notching is disposed on the die plate; wherein the lower mold comprises a lower holder located at the bottom of the lower mold and having an ejection hole corresponding to the punch, and an opening / closing plate located between the bottom of the die plate and the lower holder, having a horizontal opening / closing part that opens and closes the ejection hole and has an opening / closing hole corresponding to the punch, wherein the ejection hole is structured to be connected to the die hole and the opening / closing hole to discharge scrap and foreign matter generated after electrode notching, and wherein the opening / closing area of ​​the ejection hole is adjusted according to the vertical movement state of the upper mold, so as to change the suction force of a suction device located at the bottom of the lower mold.

Description

Technology Field

[0001] An embodiment of the present disclosure relates to an electrode notching device for a secondary battery and electrode notching for a secondary battery using the same. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and energy storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly.

[0003] The electrodes of a secondary battery are formed by notching the coated and uncoated portions of an electrode sheet using an electrode notching device. Generally, an electrode notching device includes a notching die that presses the electrode sheet in a vertical direction to notch it. Scrap and foreign substances may be generated during the electrode shearing process using the notching die.

[0004] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The problem to be solved

[0005] The present invention provides a secondary battery electrode notching device and a secondary battery electrode notching method using the same, which provides a mold structure capable of controlling suction force by adjusting the area of ​​the discharge hole to efficiently remove scrap and foreign substances generated during the secondary battery electrode notching process, thereby increasing the cleanliness of the process and improving the quality of the product.

[0006] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below. means of solving the problem

[0007] An electrode notching device for a secondary battery according to an embodiment of the present invention for solving the above technical problem comprises: an upper mold installed to be movable in the vertical direction and equipped with a punch for electrode notching; and a lower mold located at the bottom of the upper mold and equipped with a die plate having a die hole formed corresponding to the punch, wherein an electrode for notching is disposed on the die plate. The lower mold comprises: a lower holder located at the bottom of the lower mold and having an exhaust hole formed corresponding to the punch; and an opening / closing plate located between the bottom of the die plate and the lower holder, having a horizontal opening / closing part that opens / closes the exhaust hole and has an opening / closing hole formed corresponding to the punch. The exhaust hole is structured to discharge scrap and foreign matter generated after electrode notching by being connected to the die hole and the opening / closing hole. The opening / closing area of ​​the exhaust hole is adjusted according to the vertical movement state of the upper mold, so as to change the suction force of a suction device located at the bottom of the lower mold.

[0008] In some examples, the upper mold further includes an upper holder located at the top of the upper mold; and a punch holder connected to the lower surface of the upper holder, wherein the punch is installed on the lower surface of the punch holder and can descend to form or punch an electrode.

[0009] In some examples, the lower mold may further include a guide pin provided in the lower mold to guide the alignment of the lower mold and the upper mold.

[0010] In some examples, the device further includes a vertical opening / closing member positioned on one side of the punch holder and moving vertically toward the lower mold as the upper mold moves up and down, and the horizontal opening / closing member can be moved laterally when the vertical opening / closing member is lowered.

[0011] In some examples, the vertical opening / closing member may be structured to be integrally coupled with the punch holder of the upper mold and move in the same manner as the up-and-down movement of the upper mold.

[0012] In some examples, the vertical opening / closing part may protrude longer than the protrusion length of the punch.

[0013] In some examples, the initial position of the horizontal opening / closing part is a state where the discharge hole is completely closed or minimally open when the upper mold is in the highest position before or after punching, and the state where the horizontal opening / closing part has moved laterally is a state where the discharge hole is completely open or maximally open when the upper mold is in the lowest position, allowing scrap and foreign matter to be discharged due to the electrode notching.

[0014] In some examples, the opening / closing plate includes an elastic member coupled to one side of the horizontal opening / closing part to return the horizontal opening / closing part to an initial position, and the horizontal opening / closing part may be returned to an initial position by the elastic member when the vertical opening / closing part moves upward.

[0015] In some examples, the elastic member may be composed of at least one of a spring, an elastic rubber member, an elastomer material, a pneumatic cylinder, a magnetic return member, a leaf spring, and a hydraulic cylinder.

[0016] In some examples, the vertical opening / closing part and the horizontal opening / closing part come into contact through an inclined surface, and when the vertical opening / closing part moves downward, the inclined surface of the vertical opening / closing part and the horizontal opening / closing part come into close contact with each other, allowing the horizontal opening / closing part to move laterally.

[0017] In some examples, the angle of the inclined surface between the vertical opening / closing part and the horizontal opening / closing part may be in the range of 20° to 45° based on the vertical or horizontal reference.

[0018] In some examples, the die plate is provided with a through hole that guides the movement of the vertical opening / closing part, and the vertical opening / closing part can pass through the through hole of the die plate and be in close contact with the horizontal opening / closing part.

[0019] In some examples, the die hole, the opening / closing hole, and the discharge hole may be formed to perform a shearing operation of the electrode by providing a path through which the punch passes when descending.

[0020] In some examples, the size of the lower region of the discharge hole may be smaller than the size of the upper region.

[0021] In some examples, at least two vertical openings and horizontal openings are provided within a single mold, and each vertical opening and horizontal opening is connected to an independent suction device so that scrap and foreign matter generated after electrode notching can be discharged separately by type or size.

[0022] In some examples, the air blower is further included in the punch, and the device is configured in a dual manner that utilizes the air blower simultaneously with the vacuum pump of the suction device, so that scrap and foreign matter can be finally blown away with air after suction.

[0023] In some examples, the electrode may be an electrode for a secondary battery comprising a coated portion coated with an electrode active material and an uncoated portion not coated with an electrode active material.

[0024] In some examples, a method for notching an electrode for a secondary battery using an electrode notching device for a secondary battery may include: a step of minimizing suction force by opening or closing the discharge hole through the horizontal opening / closing part while the upper mold is in the highest open position and starting the transfer of the electrode; a step of completing the transfer of the electrode as the upper mold moves toward the lower mold; a step of discharging scrap and foreign matter from the notched electrode by opening the discharge hole to the maximum through the horizontal opening / closing part while the upper mold is in the lowest closed position; and a step of returning the horizontal opening / closing part to an initial position by means of the elastic member as the upper mold moves upward and the vertical opening / closing part moves upward.

[0025] In some examples, the method may further include the step of independently lowering a plurality of vertical opening / closing parts in conjunction with the lowering of the upper mold to individually move a plurality of horizontal opening / closing parts horizontally; the step of independently sucking up scrap and foreign matter generated through a plurality of discharge holes independently opened by the horizontal movement of the horizontal opening / closing parts using an individual suction device and discharging them separately; and the step of returning the plurality of horizontal opening / closing parts to their original positions using elastic restoring force while the plurality of vertical opening / closing parts rise when the upper mold rises.

[0026] In some examples, the method may further include the step of expanding the discharge hole area and increasing the suction force to remove scrap and foreign matter in the initial stage as the upper mold reaches the lowest position; and the step of closing the discharge hole to a certain extent and operating the air blower before the upper mold rises back to the highest position. Effects of the invention

[0027] According to the present invention, by providing a mold structure capable of controlling suction force by adjusting the area of ​​the discharge hole, scrap and foreign substances generated during the electrode notching process for secondary batteries can be efficiently removed, thereby increasing the cleanliness of the process and improving the quality of the product.

[0028] In addition, according to the present invention, the vertical opening and closing parts and the horizontal opening and closing parts interact through an inclined surface in conjunction with the vertical movement of the upper mold to automatically adjust the area of ​​the discharge hole, thereby optimizing the suction power without a separate complex control system.

[0029] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below. Brief explanation of the drawing

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a perspective view illustrating the structure of an electrode notching device for a secondary battery according to one embodiment. FIG. 2 is a perspective view showing the die and punch of an electrode notching device for a secondary battery according to one embodiment. FIGS. 3 to 5 are cross-sectional views illustrating region A of an electrode notching device for a secondary battery according to FIG. 1 to explain the process of controlling the discharge hole area. FIG. 6 is a perspective view illustrating the structure of an electrode notching device for a secondary battery according to another embodiment. Specific details for implementing the invention

[0031] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor may appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; thus, various equivalents and modifications that can replace them may exist at the time of filing this application. Furthermore, as used in this specification, "comprise" or "include" and / or "comprising" or "including" specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups. Additionally, when describing embodiments of the present invention, “may” or “may” may include “one or more embodiments of the present invention.”

[0032] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0033] The statement that two subjects of comparison are 'identical' means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0034] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0035] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0036] The fact that any configuration is placed on the “upper (or lower)” of a component or on the “upper (or lower)” of a component may mean not only that the any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0037] Furthermore, where it is stated that one component is “connected,” “coupled,” or “joined” to another component, it should be understood that while said components may be directly connected or joined to one another, another component may be “interposed” between each component, or that each component may be “connected,” “coupled,” or “joined” through another component. Additionally, when it is stated that a part is electrically coupled to another part, this includes not only cases where they are directly connected but also cases where they are connected with an intermediate element in between.

[0038] Throughout the specification, “A and / or B” means A, B, or A and B unless specifically stated otherwise. That is, “and / or” includes any combination or any combination of the enumerated items. “C to D” means C or more and D or less, unless specifically stated otherwise.

[0039] FIG. 1 is a perspective view illustrating the structure of an electrode notching device (1) for a secondary battery according to one embodiment. FIG. 2 is a perspective view showing a die (230) and a punch (130) of an electrode notching device (1) for a secondary battery according to one embodiment.

[0040] An electrode notching device (1) for a secondary battery according to one embodiment can be configured with an easy structure to remove scrap and foreign substances generated during the shearing process of an electrode plate. In conventional electrode shearing molds, physical devices such as suction devices, air blow devices, or scrap pushers were mainly used to remove scrap and foreign substances generated during the shearing process of an electrode plate. In particular, the scrap pusher method was the most effective removal method, but it occupied a large amount of space within the mold, making it difficult to apply to small molds with limited size. Accordingly, in small molds, reliance had to be placed mainly on suction devices mounted at the bottom and air blow methods on the punch side, which caused serious problems due to the characteristics of the electrode plate being very thin and light with a thickness of 0.01 to 0.2 mm.

[0041] In other words, when the suction force was set high to effectively remove scrap and foreign substances, the electrode plates would bend or get stuck inside the mold due to the strong suction after shearing, frequently causing transfer failures known as 'tap folding defects.' Conversely, when the suction force was set low to prevent these tap folding defects, scrap or foreign substances remained inside the mold, leading to a decrease in processing quality and production efficiency.

[0042] Accordingly, in one embodiment, the difference in suction force required between the shearing process and the transfer process is adjusted to effectively satisfy the different requirements that occur during the process. That is, to solve the problems of the existing technology described above, the present invention applies an opening and closing structure capable of dynamically adjusting the area of ​​the scrap discharge port to a suction device located at the bottom of the electrode shearing mold.

[0043] In some examples, the electrode notching device (1) for a secondary battery utilizes a CAM structure when the upper and lower molds of a press mold operate, thereby actively adjusting the area of ​​the scrap discharge port according to the operating position of the mold. The CAM structure in the present invention may mean that when the press mold moves up and down, the CAM structure switches or adjusts the direction of movement of this up-and-down movement to a horizontal direction or a specific direction, thereby performing the role of automatically opening, closing, or adjusting the scrap discharge port.

[0044] Specifically, in the electrode shearing process, the scrap discharge port is opened to its maximum area to generate strong suction force, thereby ensuring the reliable and rapid discharge of scrap and foreign substances. On the other hand, during the electrode raw material transfer process, the opening area of ​​the scrap discharge port is minimized to significantly reduce the suction force, thereby fundamentally preventing the tab portion of the electrode plate from bending or folding due to the suction force. This area-adjustable opening and closing structure operates automatically in conjunction with the operation of the mold, allowing the most suitable suction force for each process stage to be secured without separate manual operation.

[0045] Referring to FIGS. 1 and 2, the electrode notching device (1) for a secondary battery may include an upper mold (100) and a lower mold (200). In some examples, the upper mold (100) is mounted on the upper part of a press machine to perform vertical movement, while the lower mold (200) may be maintained in a fixed state. The upper mold (100) and the lower mold (200) may be located at the upper and lower parts with respect to a first direction (x).

[0046] The upper mold (100) may include an upper holder (110), a punch holder (120), a punch (130), and a vertical opening / closing part (140).

[0047] The upper holder (110) may be positioned above the lower holder (210). The upper holder (110) may be guided by the guide pins (211) of the lower holder (210) and descend to the lower holder (210) along the first direction (x). The upper holder (110) is a part directly connected to the press equipment and can serve to transmit the up-and-down movement of the press.

[0048] The punch holder (120) is located above the die plate (220) and can be supported by the upper holder (110). The punch holder (120) can descend along the first direction (x) toward the die plate (220). The punch holder (120) is a component that firmly fixes and supports the punch (130), and can fix the punch (130) in the correct position when the press is operated, thereby enabling precise work during shearing.

[0049] The punch (130) can be coupled to the punch holder (120). The punch (130) can be coupled to the punch holder (120) in various known structures. The punch (130) can have a shape corresponding to the shape of the electrode (10) to be notched. The punch (130) can be coupled to the punch holder (120) supported by the upper holder (110) to press and notch the sheet-shaped electrode (10) placed on the die (230) to manufacture the electrode (10) of the secondary battery. The electrode (10) of the secondary battery notched by the punch (130) may have an electrode tab formed by the unnotched portion (12), but is not limited thereto. That is, the punch (130) is a tool for shearing (cutting) the electrode plate, and can perform the notching operation by engaging with the die (230) of the lower mold (200) according to the up-and-down movement.

[0050] The vertical opening / closing part (140) moves up and down in conjunction with the punch holder (120) and the punch (130), and is a component that controls the opening / closing area of ​​the discharge hole (212) in conjunction with the horizontal opening / closing part (250) to be described later. The vertical opening / closing part (140) can be described as a core component of the CAM structure that converts the movement of the upper mold (100) into the horizontal opening / closing movement of the horizontal opening / closing part (250) of the lower mold (200). In some examples, the vertical opening / closing part (140) moves up and down in conjunction with the upper mold (100), and can control the horizontal movement of the horizontal opening / closing part (250) through the CAM structure. In some examples, the vertical opening / closing part (140) may protrude downwards longer than the protrusion length of the punch (130). The vertical opening / closing part (140) passes through a through hole (221) formed in the die plate (220) and contacts the horizontal opening / closing part (250), and this contact can be made through an inclined surface. When the vertical opening / closing part (140) descends, the horizontal opening / closing part (250) moves laterally due to the close contact between the inclined surfaces, thereby expanding the area of ​​the discharge hole (212) and enabling the rapid discharge of scrap and foreign matter.

[0051] The lower mold (200) may include a lower holder (210), a die plate (220), a die (230), an opening / closing plate (240), and a horizontal opening / closing part (250).

[0052] The lower holder (210) may include a guide pin (211) and a discharge hole (212). In some examples, the lower holder (210) may serve to fix and support the entire lower mold (200). In some examples, a suction device (not shown) may be located on the lower side of the lower holder (210) to suck up scrap and foreign matter, etc., so that they are discharged through the discharge hole (212).

[0053] The guide pin (211) may include a plurality of guide pins (211) extending in a first direction (x) from the lower holder (210). The plurality of guide pins (211) may extend in a first direction (x) from the upper surface of the lower holder (210). The plurality of guide pins (211) may be located at the corners of the upper surface of the lower holder (210). The upper holder (110) may be supported by the plurality of guide pins (211), and the upper holder (110) may be guided by the plurality of guide pins (211) to descend to the lower holder (200) along the first direction (x). In some examples, the guide pin (211) may serve as a guide device for accurate positional coupling during the up-and-down movement of the upper mold (100), thereby enabling the punch (130) and the die (230) to engage precisely.

[0054] The discharge hole (212) is a penetration area of ​​the punch (130) that passes through the lower holder (210) and the opening / closing plate (240), and is a path through which the punch (130) passes when shearing the electrode (10). The precise machining and positioning of the discharge hole (212) can have a direct effect on the accuracy of the electrode (10) shearing and the efficiency of scrap discharge.

[0055] The discharge hole (212) can serve as an outlet to discharge scrap and foreign matter generated after the shearing operation in the mold downwards. The opening area of ​​the discharge hole (212) can be adjusted through a CAM structure by the interaction between the vertical opening / closing part (140) and the horizontal opening / closing part (250). In some examples, when the punch (130) descends, the vertical opening / closing part (140) also descends simultaneously, and the area of ​​the discharge hole (212) is expanded due to the CAM structure, thereby increasing the suction force and allowing scrap and foreign matter to be effectively discharged. On the other hand, when the punch (130) rises, the vertical opening / closing part (140) also rises simultaneously, and the area of ​​the discharge hole (212) decreases, thereby reducing the suction force and preventing the conveying electrode (10) from being deformed or folded by the strong suction force.

[0056] The die plate (220) may include a through hole (221). The die plate (220) may be located on the side of the lower holder (210). Various known dies (230) corresponding to the shape of the electrode (10) to be notched may be mounted on the die plate (220). In some examples, the die plate (220) is a plate that supports and secures the die (230), ensuring precise positional coupling for an accurate shape and enabling precise shearing with the punch (130).

[0057] The through hole (221) is a hole formed in the die plate (220) and can provide a passage so that the vertical opening / closing part (140) of the upper mold (100) can accurately approach the horizontal opening / closing part (250) within the mold. In some examples, as the upper mold (100) descends, the vertical opening / closing part (140) can pass through the through hole (221) and come into close contact with the horizontal opening / closing part (250), and can perform the function of ensuring precise positional coupling and support when the vertical opening / closing part (140) and the horizontal opening / closing part (250) are engaged.

[0058] The die (230) may include a die hole (231). The die (230) may be coupled to a die plate (220). The die (230) may be coupled to the die plate (220) in various known structures. The die (230) may have a shape corresponding to the shape of the electrode (10) to be notched. A sheet-shaped electrode (10) may be placed on the die (230), comprising a coated portion (11) coated with an electrode active material and an uncoated portion (12) not coated with an electrode active material. The sheet-shaped electrode (10) may be extended in a sheet shape along a second direction (y) on the die (230), but is not limited thereto. The die (230) may perform a shearing operation in conjunction with a punch (130), and may form a shape while acting as a lower support for the electrode (10) being sheared.

[0059] The die hole (231) is a through hole formed in the die (230) and is the area corresponding when the punch (130) descends to cut the electrode (10). The die hole (231) of the die (230) can be precision machined to accurately process the shape of the electrode (10), and can be precisely aligned when the punch (130) descends so that the electrode (10) is sheared and scrap and foreign matter can be discharged downwards.

[0060] The opening / closing plate (240) may include an opening / closing plate hole (241) and a coupling hole (242). In some examples, the opening / closing plate (240) may be located between the die plate (220) and the lower holder (210). The opening / closing plate hole (241) may be formed in a shape corresponding to the punch (130) and may be located in a straight line with the positions of the die hole (231) and the discharge hole (212). The opening / closing plate hole (241) is a passage area for the punch (130) that penetrates the opening / closing plate (240). The opening / closing plate hole (241) in the opening / closing plate (240) may be precisely designed in position and size to facilitate the smooth discharge of scrap and foreign matter. This opening / closing plate hole (241) has a direct relationship with the shearing action of the punch (130), and precision may be required so that the shearing process can be performed accurately when the mold is closed.

[0061] In some examples, a horizontal opening / closing part (250) may be connected to the connecting hole (242) of the opening / closing plate (240). The horizontal opening / closing part (250) may move laterally within the connecting hole (242).

[0062] The horizontal opening / closing part (250) may include an opening / closing hole (251). The horizontal opening / closing part (250) may interact with the vertical opening / closing part (140) to adjust the area of ​​the scrap discharge opening inside the lower mold (200) in a horizontal direction. In some examples, the horizontal opening / closing part (250) may move horizontally by means of a CAM structure, and the movement of the vertical opening / closing part (140) may be converted horizontally through the CAM structure to adjust the area of ​​the discharge hole (212).

[0063] The opening / closing hole (251) is an area penetrating the horizontal opening / closing section (250), which enables the accurate lowering of the punch (130) and the accurate shearing of the electrode (10), and can be designed so that the operation of the punch (130) is not hindered even when the horizontal opening / closing section (250) moves by the CAM structure. In some examples, the size of the lower area of ​​the opening / closing hole (251) may be smaller than the size of the upper area. The size of the lower area of ​​such an opening / closing hole (251) may be designed to be a size that closes the discharge hole (212) area to a minimum size when the horizontal opening / closing section (250) is in its initial position. The size of the upper area of ​​the opening / closing hole (251) may correspond to the size of the die hole (231).

[0064] An elastic member (252) is provided on one side of the horizontal opening / closing part (250) and can be coupled to the coupling hole (242). The elastic member (252) returns the horizontal opening / closing part (250) to its initial position, thereby allowing the horizontal opening / closing part (250) to return to its initial position when the vertical opening / closing part (140) moves upward. In some examples, the elastic member (252) may be composed of at least one of an elastic rubber member, an elastomer material, a pneumatic cylinder, a magnetic return member, a leaf spring, and a hydraulic cylinder. That is, the elastic member (252) may be composed of an elastic body such as a spring and provide elastic force to automatically return the horizontal opening / closing part (250) to its original position after operation.

[0065] In some examples, when the press equipment is operated, the upper holder (110), punch holder (120), and punch (130) of the upper mold (100) and the vertical opening / closing part (140) are integrated to move up and down. When the upper mold (100) moves up and down, the punch (130) engages with the die (230) of the lower mold (200) to shear the electrode (10). In this process, the vertical opening / closing part (140) moves up and down according to the up and down movement of the upper mold (100) and is mechanically connected to the horizontal opening / closing part (250) of the lower mold (200) through a CAM structure to induce a horizontal opening / closing movement.

[0066] In some examples, when the vertical opening / closing part (140) is lowered, the horizontal opening / closing part (250) can be pushed horizontally by the CAM structure. This causes the discharge hole (212) to open, and the area of ​​the discharge hole (212) can be increased. When the area of ​​the discharge hole (212) is increased, the suction device can exert a stronger suction force to effectively discharge scrap and foreign matter generated during the shearing of the electrode (10).

[0067] Afterward, when the upper mold (100) rises, the CAM structure is released by the upward movement of the vertical opening / closing part (140), and the horizontal opening / closing part (250) can be returned to its original position due to the elastic force of the elastic member (252). As it returns to its original position, the area of ​​the discharge hole (212) is reduced and the suction force is weakened, so that the problem of the electrode (10) getting stuck or folded due to the suction force during electrode (10) transport can be prevented.

[0068] In some examples, the electrode notching device (1) for a secondary battery applies an inclined surface contact structure between a vertical opening / closing part (140) and a horizontal opening / closing part (250) to convert the vertical movement of the mold into a horizontal opening / closing movement. Specifically, when the vertical opening / closing part (140) descends along with the vertical movement of the upper mold (100), the inclined surface formed on the vertical opening / closing part (140) engages with and comes into close contact with the inclined surface formed corresponding to the horizontal opening / closing part (250), and in this process of contact, the horizontal opening / closing part (250) is moved in a horizontal direction (left direction in the drawing). At this time, due to the horizontal movement of the horizontal opening / closing part (250), the area of ​​the discharge hole (212) is opened and the suction force is increased, so that scrap and foreign matter generated inside the mold can be quickly discharged.

[0069] Here, the reason the contact surface between the vertical opening / closing part (140) and the horizontal opening / closing part (250) is formed as an inclined surface may be to convert vertical motion force into horizontal motion force more efficiently and smoothly. If the contact surface is formed as a simple vertical or right-angle surface, there may be problems such as impact occurring during the motion conversion process, significantly reduced motion efficiency, and increased wear or damage between parts. On the other hand, if the contact surface is formed as an inclined surface, the motion force transmitted in the vertical direction is naturally converted along the inclined surface, allowing it to be transmitted smoothly and without impact in the horizontal direction. Therefore, there is an advantage in increasing mechanical motion efficiency and minimizing wear and damage to parts that may occur during operation.

[0070] In addition, the precision of control of movement between parts can be improved through the inclined surface structure. That is, as the vertical opening / closing part (140) descends, the horizontal opening / closing part (250) is gradually pushed out by contact with the inclined surface, so the opening of the discharge hole (212) area is achieved at a gradual and controlled speed rather than instantaneously, thereby ensuring the stability and reliability of the process.

[0071] The angle of the inclined surface (angle of inclination) is an important design variable that directly affects the efficiency of motion conversion and operational precision. If the angle of the inclined surface is too small, the effect of converting vertical motion into horizontal motion is reduced and a large amount of force is required; if the angle is set too large, a problem may occur in which sufficient movement force is not transmitted to the horizontal opening / closing part (250) due to slippage between the contact surfaces during vertical motion.

[0072] Therefore, in the present invention, it is desirable to set the angle of inclination of the inclined surface by considering the optimal range that can most effectively convert vertical movement into horizontal movement. In a structure such as the mold, an angle of inclination range of approximately 20° to 45° based on a vertical or horizontal reference can be applied for effective force transmission and smooth motion conversion of parts. After interaction by such an inclined surface structure, when the vertical opening / closing part (140) rises again, contact between the two inclined surfaces is released, and the horizontal opening / closing part (250) is smoothly returned to its initial position by a separately installed elastic member (252). As a result, the discharge hole (212) is closed again with a minimum area and the suction force is minimized, so that problems such as deformation or folding of the electrode (10) can be prevented during the transfer process of the next electrode (10).

[0073] FIGS. 3 to 5 are cross-sectional views illustrating region A of an electrode notching device for a secondary battery according to FIG. 1 to explain the process of controlling the discharge hole area.

[0074] The notching mold of the electrode notching device (1) for a secondary battery according to the present invention has a structure in which an upper mold (100) and a lower mold (200) interlock to shear the electrode plate (10), and in particular, it has the feature of effectively removing scrap and foreign matter generated during the shearing process by automatically adjusting the area of ​​the discharge hole (212) through the up-and-down movement of the mold.

[0075] Specifically, referring to FIG. 3, the operation of the press mold begins in an initial open state where the upper mold (100) is separated from the lower mold (200). At this time, the upper mold (100) is positioned at the top, so the punch (130) is spaced apart from the die (230) of the lower mold (200), and at the same time, the vertical opening / closing part (140) is also positioned at the top in conjunction with the upper mold (100). Therefore, the horizontal opening / closing part (250) is not operated by the CAM structure and remains in its original position, and as a result, the discharge hole (212) is maintained in a minimum area state, thereby minimizing the suction force. This minimum suction force state may be essential to prevent the electrode (10) plate from being deformed or folded by the suction force during the transfer process of the electrode (10) plate material.

[0076] Next, as illustrated in FIG. 4, when the upper mold (100) begins to descend, the mold enters a stage where the upper and lower molds are prepared to interlock. During this process, the vertical opening / closing part (140) descends together with the upper mold (100) and activates the CAM structure. The vertical opening / closing part (140), which performs vertical movement, gradually pushes the horizontal opening / closing part (250) so that the horizontal opening / closing part (250) begins to move from its initial position to the opposite side of the part in close contact with the vertical opening / closing part (140). That is, as the horizontal opening / closing part (250) moves, the area of ​​the discharge hole (212) gradually expands, and at the same time, the suction force begins to increase. Therefore, at this point, full preparation for shear processing is completed, and the ability to discharge scrap and foreign matter is gradually strengthened.

[0077] Finally, as illustrated in FIG. 5, when the upper mold (100) reaches a closed state where it is fully engaged with the lower mold (200), the punch (130) engages precisely with the die (230) to shear the electrode plate (10). In this state, the vertical opening / closing part (140) moves to the lowest position, thereby pushing the horizontal opening / closing part (250) to its maximum extent. That is, the horizontal opening / closing part (250) is opened to its maximum extent in the direction opposite to the part in contact with the vertical opening / closing part (140), thereby maintaining a state where the area of ​​the discharge hole (212) is expanded to its maximum extent. In this state, the suction force increases to its maximum value, powerfully sucking up scrap and foreign matter generated during the shearing process and rapidly discharging them through the discharge hole (212), thereby completely removing any residue remaining inside the mold.

[0078] In some examples, after the shearing operation is completed, when the upper mold (100) starts to rise again, the vertical opening / closing part (140) also rises to release the pressure of the horizontal opening / closing part (250). At this time, the horizontal opening / closing part (250) automatically returns to its original position by the restoring force of the elastic member (252), and the discharge hole (212) area narrows back to the minimum area, returning to the initial minimum suction force state. This prepares the next electrode (10) plate for smooth transport once again.

[0079] The structure of the vertical opening / closing part (140) and the horizontal opening / closing part (250) of the present invention can provide an excellent effect of effectively and automatically linking mold operation and the opening / closing of the discharge port through mechanical interaction using a simple CAM structure between the upper mold and the lower mold, without requiring separate electrical control or complex mechanical devices. Accordingly, the present invention can provide advantageous technical effects that can simultaneously improve the quality of electrode plate shearing processing and ensure the stability and efficiency of the production process.

[0080] FIG. 6 is a perspective view illustrating the structure of an electrode notching device (1000) for a secondary battery according to another embodiment.

[0081] Referring to FIG. 6, in some examples, the present invention may be designed to have a plurality (e.g., two or more) of vertical opening / closing parts (1401, 1402) and horizontal opening / closing parts (2501, 2502) within a single mold so that each component operates independently and can effectively discharge scrap and foreign matter of various sizes and types.

[0082] The die plate (220) may include two through holes (2211, 2212) formed to correspond to two vertical opening / closing parts (1401, 1402). The opening / closing plate (240) may include two coupling holes (2421, 2422). Two horizontal opening / closing parts (2501, 2502) may each be coupled to the coupling holes (2421, 2422). Each of the horizontal opening / closing parts (2501, 2502) may move laterally within the coupling holes (2421, 2422). Each of the horizontal opening / closing parts (2501, 2502) may include an opening / closing hole (2511, 2512). The horizontal opening / closing parts (2501, 2502) interact with the vertical opening / closing parts (1401, 1402) respectively to adjust the area of ​​the scrap discharge port (i.e., discharge hole) inside the lower mold (200) in the horizontal direction. An elastic member (2521, 2522) is provided on one side of each horizontal opening / closing part (2501, 2502) and can be coupled to a coupling hole (2421, 2422).

[0083] In this multi-opening structure, each vertical opening (1401, 1402) and horizontal opening (2501, 2502) are individually connected to a separate, independent suction device, so that scrap and foreign matter generated during the notching process can be separated by type or size and separately sucked and discharged. This increases discharge efficiency and maximizes the recycling rate of scrap and the convenience of management.

[0084] Each opening / closing unit set (vertical opening / closing unit and horizontal opening / closing unit) is linked to the up-and-down movement of the upper mold, and the area of ​​the opening / closing hole can be independently adjusted through a CAM or slider mechanism. For example, the first opening / closing unit set (1401, 2501) is mainly responsible for discharging large scrap generated when cutting electrode tabs, and the second opening / closing unit set (1402, 2502) can be used to separately discharge fine dust or foreign substances in the form of chips. At this time, the suction device connected to each opening / closing unit is equipped with an independent vacuum pump, so that it can be individually controlled with an appropriate suction pressure according to the nature and amount of the scrap.

[0085] These independent openings and closings can each be connected to a dedicated vacuum pump and suction unit via separate suction piping, and the suction unit can individually control the suction pressure through a PLC (Programmable Logic Controller) linked to a pressure sensor. Accordingly, the suction pressure of each opening and closing can be optimized to match the weight, size, and shape of the scrap, thereby ensuring effective discharge. This configuration can contribute to maximizing the efficiency and economic viability of disposal and recycling by moving different types of by-products from the electrode manufacturing process to separate recovery devices.

[0086] In some examples, the plurality of vertical opening / closing parts (1401, 1402), plurality of through holes (2211, 2212), plurality of coupling holes (2421, 2422), plurality of horizontal opening / closing parts (2501, 2502), plurality of opening / closing holes (2511, 2512) and plurality of elastic members (2521, 2522) of the electrode notching device (1) for a secondary battery shown in FIG. 1 may be components implemented identically or similarly to the vertical opening / closing part (140), through hole (221), coupling hole (242), horizontal opening / closing part (250), opening / closing hole (251), and elastic member (252) of the electrode notching device (1) for a secondary battery shown in FIG. 1.

[0087] In some examples, the present invention may also additionally install an air blower (300) in the punch (130). The air blower (300) is used in conjunction with a suction device to form a dual discharge mechanism, and after first removing most of the scrap and foreign matter by sucking it in through the suction device, the remaining scrap or fine foreign matter can be additionally discharged by air pressure through the air blower (300) installed in the punch (130). An air blower nozzle installed on the bottom or side of the punch (130) is connected to a compressed air line within the mold and can be controlled via a separate pneumatic control valve and PLC.

[0088] That is, a dual method can be implemented in which, after the electrode notching is completed, air is blown simultaneously with the vacuum suction of the suction device to forcefully blow away any remaining scrap or foreign matter, thereby completely removing it from the outlet. This air blow (300) is controlled to operate mainly at the time when the press is lowered and the mold closes, or just before it rises again, so that any remaining scrap or fine foreign matter that was not discharged by the suction device can be completely discharged by forcefully blowing high-pressure air, thereby maximizing the cleanliness inside the mold and significantly reducing the product defect rate caused by notching residue. To implement this structure, the position of the pneumatic line and the nozzle inside the mold must be precisely coordinated, and the size and angle of the nozzle outlet need to be designed to maximize discharge efficiency.

[0089] This configuration ensures rapid and accurate scrap discharge in environments where electrode shearing molds operate repeatedly at high speeds, and by separating and managing scrap according to type and size, it can provide advantages in subsequent disposal or recycling processes. In particular, the dual suction and spraying method is highly effective in preventing internal contamination by using air pressure to additionally remove thin film fragments or metal dust that are difficult to remove with simple suction alone.

[0090] In some examples, the electrode (10) may be a negative electrode or an anode. Such electrode (10) may be formed as a thin plate or film.

[0091] When the electrode (10) is a negative electrode, it may be formed by coating a negative electrode active material, such as graphite or carbon, onto a negative electrode current collector formed from a metal foil such as copper, a copper alloy, nickel, or a nickel alloy. The negative electrode (10) may include a coating portion (11) on which the negative electrode active material is applied. The negative electrode (10) may include an uncoated portion (12), which is an area where the negative electrode active material is not applied. In some examples, when manufacturing the negative electrode (10), a negative electrode tab may be formed by cutting it in advance to protrude to one side.

[0092] The negative electrode active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0093] A material capable of reversibly intercalating / deintercalating the above lithium ions may be a carbon-based negative electrode active material, such as crystalline carbon, amorphous carbon, or a combination thereof. Examples of the crystalline carbon include graphite, such as natural graphite or artificial graphite, and examples of the amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0094] As a material capable of doping and undoping the above lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material may be used. The above Si-based negative electrode active material is silicon, a silicon-carbon composite, or SiO₂. x (0 < x < 2), may be a Si-based alloy or a combination thereof.

[0095] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0096] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer located on the surface of the core.

[0097] A negative electrode for a lithium secondary battery comprises a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer comprises a negative electrode active material and may further comprise a binder and / or a conductive material.

[0098] For example, the negative electrode active material layer may comprise 90% to 99% by weight of negative electrode active material, 0.5% to 5% by weight of binder, and 0% to 5% by weight of conductive material.

[0099] As the binder, a non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof may be used. When an aqueous binder is used as the cathode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0100] As the above-mentioned cathode current collector, a material selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, and combinations thereof may be used.

[0101] The electrolyte for lithium secondary batteries contains a non-aqueous organic solvent and a lithium salt.

[0102] The above-mentioned non-aqueous organic solvent serves as a medium through which ions involved in the electrochemical reaction of the battery can move.

[0103] The above-mentioned non-aqueous organic solvent may be a carbonate-based, ester-based, ether-based, ketone-based, or alcohol-based solvent, a non-protic solvent, or a combination thereof, and may be used alone or in a mixture of two or more types.

[0104] In addition, when using carbonate-based solvents, cyclic carbonates and chain carbonates can be mixed and used.

[0105] When the electrode (10) is a positive electrode, it may be formed by applying a positive active material, such as graphite or carbon, to a positive current collector plate formed of a metal foil, such as aluminum or an aluminum alloy. The positive electrode (10) may include a coating portion (11) on which the positive active material is applied. The positive electrode (10) may include an uncoated portion (12), which is an area where the positive active material is not applied. In some examples, when manufacturing the positive electrode (10), a positive tab may be formed by cutting it in advance to protrude to one side.

[0106] As a positive electrode active material, a compound capable of reversible intercalation and deintercalation of lithium (a lithated intercalation compound) may be used. Specifically, one or more composite oxides of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof may be used.

[0107] The above composite oxide may be a lithium transition metal composite oxide, and specific examples include a lithium nickel-based oxide, a lithium cobalt-based oxide, a lithium manganese-based oxide, a lithium iron phosphate-based compound, a cobalt-free nickel-manganese-based oxide, or a combination thereof.

[0108] As an example, a compound represented by any one of the following chemical formulas may be used. Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c About 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b-c Mn b X c About 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2(0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4(0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3(0≤f≤2); Li a FePO4(0.90≤a≤1.8).

[0109] In the above chemical formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; L 1 is Mn, Al, or a combination thereof.

[0110] A positive electrode for a lithium secondary battery may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer may include a positive electrode active material and may further include a binder and / or a conductive material.

[0111] The content of the positive active material is 90% to 99.5% by weight with respect to 100% by weight of the positive active material layer, and the content of the binder and the conductive material may each be 0.5% to 5% by weight with respect to 100% by weight of the positive active material layer.

[0112] Al may be used as the current collector mentioned above, but is not limited thereto.

[0113] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0114] 1: Electrode notching device for secondary batteries 10: Electrode 11: Coating part 12: Mujibu 100: Upper mold 110: Upper holder 120: Punch holder 130: Punch 140: Vertical opening / closing part 200: Lower mold 210: Lower holder 211: Guide pin 212: Exhaust hole 220: Die Plate 221: Through hole 230: Die 231: Diehole 240: Opening / closing plate 241: Opening / closing plate hole 242: Connection hole 250: Horizontal opening / closing part 251: Opening and closing hall 252: Elastic member

Claims

Claim 1 An electrode notching device for a secondary battery, comprising: an upper mold installed to be movable in the vertical direction and equipped with a punch for electrode notching; and a lower mold located at the bottom of the upper mold and equipped with a die plate having a die hole corresponding to the punch, wherein an electrode for notching is disposed on the die plate, wherein the lower mold comprises: a lower holder located at the bottom of the lower mold and having an exhaust hole corresponding to the punch; and an opening / closing plate located between the bottom of the die plate and the lower holder, having a horizontal opening / closing part that opens / closes the exhaust hole and has an opening / closing hole corresponding to the punch, wherein the exhaust hole is structured to be connected to the die hole and the opening / closing hole to discharge scrap and foreign matter generated after electrode notching, and wherein the opening / closing area of ​​the exhaust hole is adjusted according to the vertical movement state of the upper mold, so as to change the suction force of a suction device located at the bottom of the lower mold. Claim 2 An electrode notching device for a secondary battery according to claim 1, wherein the upper mold further comprises an upper holder located at the top of the upper mold; and a punch holder connected to the lower surface of the upper holder, and the punch is installed on the lower surface of the punch holder and descends to form or punch an electrode. Claim 3 An electrode notching device for a secondary battery according to claim 1, wherein the lower mold further comprises a guide pin provided in the lower mold to guide the alignment of the lower mold and the upper mold. Claim 4 An electrode notching device for a secondary battery according to claim 2, further comprising a vertical opening / closing member disposed on one side of the punch holder and moving vertically toward the lower mold according to the vertical movement of the upper mold, and moving the horizontal opening / closing member laterally when the vertical opening / closing member is lowered. Claim 5 In claim 4, the vertical opening / closing part is integrally coupled with the punch holder of the upper mold and has a structure that moves in the same manner as the up-and-down movement of the upper mold, an electrode notching device for a secondary battery. Claim 6 In claim 4, the vertical opening / closing portion protrudes longer than the protruding length of the punch, an electrode notching device for a secondary battery. Claim 7 In claim 4, the initial position of the horizontal opening / closing part is such that the discharge hole is completely closed or minimally open when the upper mold is in the highest position before or after punching, and the state in which the horizontal opening / closing part has moved laterally is such that the discharge hole is completely open or maximally open when the upper mold is in the lowest position, thereby discharging scrap and foreign matter resulting from the electrode notching, in an electrode notching device for a secondary battery. Claim 8 An electrode notching device for a secondary battery according to claim 7, wherein the opening / closing plate includes an elastic member coupled to one side of the horizontal opening / closing part to return the horizontal opening / closing part to an initial position, and the horizontal opening / closing part returns to an initial position by the elastic member when the vertical opening / closing part moves upward. Claim 9 An electrode notching device for a secondary battery according to claim 8, wherein the elastic member comprises at least one of a spring, an elastic rubber member, an elastomer material, a pneumatic cylinder, a magnetic return member, a leaf spring, and a hydraulic cylinder. Claim 10 An electrode notching device for a secondary battery according to claim 4, wherein the vertical opening / closing part and the horizontal opening / closing part contact each other through an inclined surface, and when the vertical opening / closing part moves downward, the vertical opening / closing part and the inclined surface of the horizontal opening / closing part come into close contact with each other to move the horizontal opening / closing part laterally. Claim 11 An electrode notching device for a secondary battery according to claim 10, wherein the angle of the inclined surface between the vertical opening / closing part and the horizontal opening / closing part is in the range of 20° to 45° based on the vertical or horizontal reference. Claim 12 In claim 4, the die plate is provided with a through hole that guides the movement of the vertical opening / closing part, and the vertical opening / closing part passes through the through hole of the die plate and comes into close contact with the horizontal opening / closing part, an electrode notching device for a secondary battery. Claim 13 An electrode notching device for a secondary battery according to claim 1, wherein the die hole, the opening / closing hole, and the discharge hole are formed to perform a shearing operation of the electrode by providing a path through which the punch passes when descending. Claim 14 An electrode notching device for a secondary battery according to claim 1, wherein the size of the lower region of the discharge hole is smaller than the size of the upper region. Claim 15 An electrode notching device for a secondary battery according to claim 4, comprising at least two vertical opening / closing sections and a horizontal opening / closing section within a single mold, wherein each vertical opening / closing section and the horizontal opening / closing section are connected to an independent suction device so that scrap and foreign substances generated after electrode notching can be discharged separately by type or size. Claim 16 An electrode notching device for a secondary battery according to claim 1, further comprising an air blow provided in the punch, configured in a dual manner that utilizes the air blow simultaneously with the vacuum pump of the suction device, and finally blows air after suctioning scrap and foreign substances. Claim 17 An electrode notching device for a secondary battery, wherein, in claim 1, the electrode is an electrode for a secondary battery comprising a coated portion coated with an electrode active material and an uncoated portion not coated with an electrode active material. Claim 18 A method for notching an electrode for a secondary battery according to one of claims 1 to 17, comprising: a step of, in a mold open state where the upper mold is in the highest position, minimizing suction force by opening or closing the discharge hole through the horizontal opening / closing part to the minimum, and starting the transfer of the electrode; a step in which the transfer of the electrode is completed simultaneously with the upper mold moving toward the lower mold; a step in which, in a mold closed state where the upper mold is in the lowest position, the discharge hole is opened to the maximum through the horizontal opening / closing part to discharge scrap and foreign matter of the notched electrode; and a step in which the upper mold moves upward simultaneously with the vertical opening / closing part moving upward, and the horizontal opening / closing part returns to an initial position by the elastic member. Claim 19 A method for notching electrodes for a secondary battery according to claim 18, further comprising: a step of independently lowering a plurality of vertical opening / closing parts in conjunction with the lowering of the upper mold to individually move a plurality of horizontal opening / closing parts horizontally; a step of independently sucking up scrap and foreign substances generated through a plurality of discharge holes independently opened through the horizontal movement of the horizontal opening / closing parts using an individual suction device and discharging them separately; and a step of returning the plurality of horizontal opening / closing parts to their original position using elastic restoring force simultaneously with the raising of the plurality of vertical opening / closing parts when the upper mold is raised. Claim 20 A method for notching an electrode for a secondary battery according to claim 18, further comprising: a step of removing scrap and foreign matter in an initial stage by expanding the discharge hole area and increasing the suction force as the upper mold reaches the lowest position; and a step of closing the discharge hole to a certain degree and operating the air blow device before the upper mold rises back to the highest position.

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