Cutter and secondary battery manufacturing apparatus including same

Abstract

A cutter according to one embodiment of the present disclosure includes a cutting edge, and further includes a first surface, a second surface, and a third surface, the first surface and the second surface extending at a predetermined angle in a first direction as a cutting direction, the third surface extending in a second direction perpendicular to the first direction, one end of the first surface and one end of the second surface are in contact with each other and form a vertex as the cutting edge, and one end and the other end of the third surface are respectively in contact with the other end of the first surface and the other end of the second surface.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2022-0105363 filed on August 23, 2022, Korean Patent Application No. 10-2023-0102321 filed on August 4, 2023, and Korean Patent Application No. 10-2023-0102322 filed on August 4, 2023, filed in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a secondary battery manufacturing apparatus, and more particularly, to a secondary battery manufacturing apparatus capable of reducing bag sealing time while ensuring the sealing quality of a battery cell. Background Art

[0004] As the technology of mobile devices develops and the demand increases, the demand for secondary batteries as energy sources is rapidly increasing. Therefore, various studies are being conducted on batteries that can meet various demands.

[0005] Secondary batteries have attracted great attention as energy sources for power-driven devices such as electric bicycles, electric vehicles, and hybrid electric vehicles, and as energy sources for mobile devices such as mobile phones, digital cameras, and notebook computers.

[0006] In general, there is a very high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries having advantages such as high energy density, discharge voltage, output stability, and the like.

[0007] In addition, secondary batteries can be classified based on the structure of the electrode assembly, which has a structure in which the positive electrode and the negative electrode are stacked with a separator interposed between the positive electrode and the negative electrode. Generally, a jelly roll (winding) type electrode assembly in which a long sheet type positive electrode and a long sheet type negative electrode are wound with a separator interposed therebetween can be mentioned; a stacked (laminated) type electrode assembly in which a plurality of positive and negative electrodes cut into a predetermined unit size are sequentially stacked with a separator interposed therebetween, etc. Among them, in order to manufacture a stacked (laminated) type electrode assembly, it is first necessary to cut the sheet-shaped positive and negative electrodes.

[0008] Figure 1 is a diagram showing a conventional secondary battery manufacturing apparatus. Figure 2 is a diagram showing a state in which a secondary battery material is adhered when a sheet is cut in a conventional secondary battery manufacturing apparatus.

[0009] Reference Figure 1 and Figure 2, the conventional secondary battery manufacturing apparatus 10 may cut the sheet 11 by the cutting member 20. The sheet 11 may include an electrode sheet or a separator sheet.

[0010] Specifically, the cutting member 20 may cut the sheet 11 moving in the second direction (x-axis direction) while moving in the first direction (z-axis direction and −z-axis direction).

[0011] However, when the sheet 11 is repeatedly cut, heat is generated in the cutting member 20 due to friction or the like, and scattered matter or the like of the cut sheet 11 may adhere. More specifically, the scattered matter or the like is adhered while moving upward in the direction of the inclined surface of the blade while in contact with the blade of the cutting member 20. Therefore, the cut surface of the cut sheet 11 may not be smooth due to the scattered matter or the like of the sheet adhering to the cutting member 20.

[0012] Furthermore, if the electrode sheet 11 is repeatedly cut, the blade of the cutting member 20 may become dull. If the electrode sheet 11 is cut with the cutting member 20 having a dull blade, the cut surface of the electrode or the separator 12 after cutting may not be smooth.

[0013] Therefore, there is a problem that scattered matter of the sheet or the like adheres to the cutting member 20 or the blade of the cutting member 20 becomes blunt, which may cause quality defects of the electrode. Therefore, attempts to reduce the occurrence of problems such as the above are still being made. Summary of the invention

[0014] Technical issues

[0015] An object of the present disclosure is to provide a secondary battery manufacturing apparatus that improves the efficiency of a secondary battery manufacturing process and manufactures a secondary battery with improved safety.

[0016] However, the technical problems to be solved by the embodiments of the present disclosure are not limited to the above-mentioned problems, and various extensions can be made within the scope of the technical ideas included in the present disclosure.

[0017] Technical Solution

[0018] According to one embodiment of the present disclosure, there is provided a tool including a blade, the tool comprising: a first surface, a second surface and a third surface, the first surface and the second surface extending at a predetermined angle toward a first direction as a cutting direction, the third surface extending toward a second direction perpendicular to the first direction, wherein one end of the first surface and one end of the second surface form a vertex as the blade while contacting each other, wherein one end and the other end of the third surface are in contact with the other end of the first surface and the other end of the second surface, respectively.

[0019] The first surface and the second surface may be provided with protrusions, where the protrusions are protruding areas.

[0020] The protrusion includes a protrusion start portion, which is a region where the protrusion starts with the apex as a reference, and a length from the apex to the protrusion start portion may be shorter than a height of the sheet.

[0021] The tool according to another embodiment of the present disclosure may further include a recessed portion which is a region hollowed out to be recessed from the first surface and the second surface.

[0022] The concave portion includes a concave start portion, which is a region where the concave portion starts with the apex as a reference, and a length from the apex to the concave start portion may be shorter than a height of the sheet.

[0023] The radius of the concave portion may be greater than 0.01 mm.

[0024] The tool may further include a protrusion which is a region protruding from the first surface and the second surface, and a recessed portion which is a region hollowed out to be recessed from the first surface and the second surface.

[0025] The angle of the vertex may be less than 120 degrees.

[0026] The cutter may be cermet.

[0027] According to another embodiment of the present disclosure, a secondary battery manufacturing apparatus including the cutter is provided.

[0028] Beneficial Effects

[0029] According to the embodiment, scattered matter generated when cutting the secondary battery material does not adhere to the cutting member, so that the quality of the electrode can be improved and the safety of the secondary battery can be improved.

[0030] Effects obtained from the present disclosure are not limited to the above-mentioned effects, and additional other effects not mentioned herein will be clearly understood by those skilled in the art from the description of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a diagram showing a conventional secondary battery manufacturing apparatus;

[0032] Figure 2 is a diagram showing a state in which a secondary battery material is adhered when a sheet is cut in a conventional secondary battery manufacturing apparatus;

[0033] Figure 3is a perspective view showing a secondary battery manufacturing apparatus according to an embodiment of the present disclosure;

[0034] Figure 4 The content of this disclosure is viewed from a third party perspective. Figure 3 A view of the cutting member and vibrator;

[0035] Figure 5 is a flowchart showing a process of identifying whether there is a defect in a secondary battery;

[0036] Figure 6 (a) is a flowchart showing a process in which a user identifies whether there is a defect in a secondary battery, Figure 6 (b) is a flowchart showing a process of the secondary battery manufacturing system for identifying whether there is a defect in the secondary battery;

[0037] Figure 7 is a diagram showing a tool according to a modified example of the present disclosure;

[0038] Figure 8 It shows that according to the setting Figure 7 A diagram showing the position of the protrusions and the degree of adhesion of the secondary battery material;

[0039] Fig. 9 is a diagram showing a tool according to another modified example of the present disclosure;

[0040] Fig.10 It shows that according to the setting Fig. 9 A diagram showing the position of the concave portion and the degree of adhesion of the secondary battery material;

[0041] Fig.11 is a diagram showing a tool according to another modified example of the present disclosure;

[0042] Fig.12 is a perspective view showing a secondary battery manufacturing apparatus according to another embodiment of the present disclosure;

[0043] Fig.13 It is shown Fig.12 FIG. 1 is a diagram of a deformation example of a substrate. DETAILED DESCRIPTION

[0044] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present disclosure can be modified in various different ways and is not limited to the embodiments described herein.

[0045] Parts irrelevant to the description will be omitted to clearly describe the present disclosure, and the same reference numerals denote the same or similar elements throughout the application.

[0046] In addition, in the drawings, for the convenience of description, the size and thickness of each element are arbitrarily shown, and the present disclosure is not necessarily limited to the drawings. In the drawings, for the sake of clarity, the thickness of layers, regions, etc. are exaggerated. In the drawings, for the convenience of description, the thickness of components and regions is exaggerated.

[0047] Furthermore, it should be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "over" another element, it can be directly on the other element or intervening elements may also be present. Conversely, when an element is referred to as being "directly on" another element, this means that there are no other intervening elements. Furthermore, a portion being "above" or "on" a reference portion means that the portion is above or below the reference portion, rather than specifically indicating that the portion is "above" or "on" in the opposite direction of gravity.

[0048] In addition, throughout the application, when a part is referred to as “including” or “comprising” a part, unless otherwise specified, this means that the part may further include other parts, rather than excluding the other parts.

[0049] Furthermore, throughout the application, when referred to as a “plane”, this means observing the target portion from the upper side, and when referred to as a “cross section”, this means observing the target portion from one side of the cross section cut vertically.

[0050] Figure 3 is a perspective view showing a secondary battery manufacturing apparatus according to an embodiment of the present disclosure. Figure 4 The content of this disclosure is viewed from a third party perspective. Figure 3 View of the cutting member and vibrator.

[0051] Reference Figure 3 , a secondary battery manufacturing apparatus 100 according to an embodiment of the present disclosure includes a substrate 130 , a cutting member 200 , and a vibrator 300 .

[0052] The substrate 130 may be a flat plate. The sheet 110 may be located on one surface of the substrate 130. The sheet 110 may include a secondary battery material. As an example, the sheet 110 may be an electrode sheet or a separator sheet.

[0053] The substrate 130 may move in the second direction D2, and the sheet 110 may also move along with the movement of the substrate 130. Here, the second direction D2 may be a direction parallel to the substrate 130.

[0054] The cutting member 200 may contact the sheet 110 while moving in the first direction D1. The first direction D1 may be a direction perpendicular to the substrate 130. In this figure, the first direction D1 is represented as a direction in a coordinate system, which includes not only a direction in the coordinate system but also a direction opposite thereto, and the second direction D2 and the third direction D3 will be understood similarly.

[0055] The cutting member 200 may cut the sheet 110 while being in contact with the sheet 110. At this time, the sheet 110 may be cut along the third direction D3.

[0056] The cutting member 200 may cut the sheet 110 using ultrasonic waves. Specifically, the cutting member 200 may receive the transmission of ultrasonic waves generated from the vibrator 300, and the vibrator 300 may be fixed while in contact with the cutting member 200 and may generate ultrasonic vibrations. That is, the ultrasonic vibrations generated from the vibrator 300 are transmitted to the cutting member 200, and the cutting member 200 transmits the transmitted ultrasonic vibrations to the sheet 110, so that the sheet 110 can be cut.

[0057] In the following, reference will be made to Figure 4 The cutting member 200 and the vibrator 300 according to an embodiment of the present disclosure are described in more detail.

[0058] Specifically, the cutting member 200 may include a cutter 210 , a support portion 220 , and a clamp 230 .

[0059] The cutter 210 may cut the sheet 110. The cutter 210 may cut the sheet 110 by ultrasonic vibration. The cutter 210 may be provided with a blade at one end, wherein the blade may cut the sheet 110 while in contact with the sheet 110.

[0060] The cutter 210 may be made of cermet. Since the cutter 210 is made of cermet, the friction between the cutter 210 and the secondary battery material may be minimized during cutting.

[0061] The tool 210 may include a first surface 211 , a second surface 212 , and a third surface 213 .

[0062] The first surface 211 and the second surface 212 of the cutter 210 may be surfaces extending toward the first direction D1 at a predetermined angle, respectively. Here, the first direction D1 is the direction in which the cutter 210 moves, which indicates the direction in which the sheet 110 is cut. At this time, one end of the first surface 211 and one end of the second surface 212 may form a vertex 214 while contacting each other, wherein the vertex 214 may be a blade.

[0063] The first surface 211 and the second surface 212 may form a certain angle when one end of each of the surfaces contacts each other, wherein the angle may be defined as a first angle a1. That is, the angle at the vertex 214 may be the first angle a1. At this time, the first angle a1 may be less than 120 degrees.

[0064] Specifically, when the first angle a1 is less than 120 degrees, the cutting quality of the secondary battery material can be ensured. When the first angle a1 exceeds 120 degrees, the cutting cannot be performed correctly due to problems such as the first surface 211 or the second surface 212 of the cutter 210 contacting the sheet 110, which may affect the quality of the electrode.

[0065] The third surface 213 may be a surface extending in the second direction D2. Here, the second direction D2 is a direction perpendicular to the direction in which the tool 210 moves, and is expressed as a direction perpendicular to the first direction. One end and the other end of the third surface 213 may be positioned when contacting the other end of the first surface 211 and the other end of the second surface 212, respectively. The third surface 213 may be fixedly positioned when contacting one surface of the support portion 220. Therefore, the tool 210 may be mounted and fixed to the support portion 220.

[0066] However, the shapes and directions of the first surface 211 , the second surface 212 , and the third surface 213 of the cutter 210 are not limited to the above, and any shape may be used as long as it can cut the sheet 110 while maintaining the electrode quality.

[0067] The clamp 230 may be disposed on an outer surface of the support portion 220 .

[0068] The clamp 230 may be disposed to surround the outer surface of the support portion 220. That is, the clamp 230 may move in a state of being coupled to the support portion 220. Specifically, the clamp 230 is connected to an actuator and may move in a first direction D1 according to control of the actuator. Therefore, the support portion 220 in contact with the clamp 230 and the cutter 210 fixed to the support portion 220 may move in the first direction D1 to correspond to the movement of the clamp 230. That is, the cutter 210 may cut the sheet 110 moving in the second direction D2 while being moved in the first direction D1 by the clamp 230.

[0069] As described above, when the sheet material 110 is cut using ultrasonic vibration, the cut surface of the sheet material 110 can be cut more cleanly than when the sheet material 110 is cut using a general knife.

[0070] The vibrator 300 may generate ultrasonic vibration and transmit the ultrasonic vibration to the cutting member 200. Specifically, the ultrasonic vibration generated by the vibrator 300 is transmitted to the support 220, and the ultrasonic vibration transmitted to the support 220 is transmitted to the cutter 210, so that the sheet 110 can be cut.

[0071] The vibrator 300 may be fixedly positioned while in contact with one surface of the support portion 220. Specifically, the vibrator 300 may be fixedly positioned on one surface of the support portion 220 opposite to one surface of the support portion 220 where the tool 210 is located.

[0072] The vibrator 300 receives a constant power transfer from an external power source and can generate ultrasonic waves. However, when cutting the sheet 110, if the sheet 110 is not cut correctly due to any defective cutting quality, etc., resonance may occur.

[0073] When resonance occurs, the power applied to the vibrator 300 may increase above a certain value, which may indicate a defect in the cutting quality of the sheet 110. In the above case, the user / manager recognizes the change in the power range applied to the vibrator 300 and can confirm the defect in the cutting quality, but the secondary battery manufacturing apparatus 100 of the present disclosure may include a secondary battery manufacturing system that recognizes the power value applied to the vibrator 300 to determine whether the cutting quality of the sheet 110 is normal or defective. This will be described later. Figure 5 More details are given in .

[0074] In summary, the user can determine whether there is a defect in the cutting quality of the sheet 110 by changing the power range applied to the vibrator 300, or set a power sensor electrically connected to the power supply to identify the power range applied to the vibrator 300, thereby being able to determine whether there is a defect in the cutting quality of the sheet 110. Therefore, compared with determining the cutting quality of the sheet using a camera, a visual sensor, etc. under conventional circumstances, determining the cutting quality of the sheet based on the power range applied to the vibrator 300 can improve the accuracy of defect screening, and improve process efficiency and electrode quality.

[0075] Refer again Figure 4 , the support part 220 and the vibrator 300 may include holes, respectively. The support part 220 may include a first hole 221, and the vibrator 300 may include a second hole 310. The first hole 221 is a hole passing through the support part 220, and the second hole 310 is a hole passing through the vibrator 300. At least one or more first holes 221 and second holes 310 may be formed, respectively.

[0076] Specifically, the first hole 221 is shown as passing through the support portion 220 along the third direction D3, but is not limited thereto, and the first hole 221 may pass through the support portion 220 along the second direction D2. Similar to the first hole 221, the second hole 310 is also shown as passing through the vibrator 300 along the third direction D3, but is not limited thereto, and the second hole 310 may pass through the vibrator 300 along the second direction D2.

[0077] The first hole 221 and the second hole 310 can function as a flow path. This is because a fluid such as air can move through the first hole 221 and the second hole 310. Therefore, when heat is generated in the cutting member 200 and the vibrator 300 due to the continuously performed cutting process, air cooling can be performed through the first hole 221 and the second hole 310, thereby cooling the heat generated in the cutting member 200 and the vibrator 300. This prevents the heat generated by the vibrator 300 from being transferred to the support portion 220 and the cutter 210, thereby preventing the secondary battery material from adhering to the cutter 210 due to heat as much as possible when cutting the sheet 110.

[0078] Figure 5 is a flowchart showing a process of identifying whether a defect exists in a secondary battery. Figure 6 (a) is a flowchart showing a process in which a user identifies whether there is a defect in a secondary battery, Figure 6 (b) is a flowchart showing a process of the secondary battery manufacturing system for identifying whether a defect exists in the secondary battery.

[0079] Reference Figure 5 and Figure 6 , in the secondary battery manufacturing apparatus 100 according to the embodiment of the present disclosure, the presence of a defect in the sheet may be determined according to the power range applied to the vibrator 300 .

[0080] Specifically, if the sheet is not cut correctly by the secondary battery manufacturing device 100, resonance may occur, and when resonance occurs, the power applied to the vibrator 300 may be greater than or equal to a preset level. For example, if the power applied to the vibrator 300 during normal cutting is the first power W1, the power applied to the vibrator 300 when the cut sheet 110 is defective may be referred to as the second power W2. At this time, the first power W1 and the second power W2 may have different values.

[0081] Therefore, when the second power W2 is applied to the vibrator 300, the user or the secondary battery manufacturing system can identify the abnormality in the power range and take measures accordingly. More details on identifying the power range will be described in Figure 6 Given in.

[0082] Reference Figure 6(a) A user or manager may take appropriate measures according to the power range applied to the vibrator 300.

[0083] More specifically, the secondary battery manufacturing device 100 according to one embodiment may include a display unit U1. The display unit U1 is configured to be electrically connected to the power source P, and may be configured to display the power range applied to the vibrator 300 from the power source P. The display unit U1 may include a component for displaying the power range, for example, a component such as a panel may be included. Therefore, the user can identify the power range currently applied to the secondary battery manufacturing device 100 through the display unit U1.

[0084] Therefore, when the power range displayed on the display unit U1 is the first power W1 , the user recognizes that the secondary battery manufacturing apparatus 100 is operating normally and can continue to let the secondary battery manufacturing apparatus 100 cut the sheet 110 .

[0085] On the other hand, when the power range displayed on the display unit U1 is the second power W2, the user recognizes that resonance currently occurs and the sheet 110 is not correctly cut to cause a defect, and the secondary battery manufacturing process can be interrupted.

[0086] Reference Figure 6 (b) The secondary battery manufacturing apparatus 100 according to another embodiment may be controlled by a secondary battery manufacturing system.

[0087] The secondary battery manufacturing system may include a sensor unit U2 and a control unit U3. Both the sensor unit U2 and the control unit U3 may be configured to be electrically connected to a power source P.

[0088] The sensor unit U2 may identify the power range applied to the vibrator 300 and transmit an electrical signal according to the power value range to the control unit U3. The control unit U3 may receive the transmission of the electrical signal from the sensor unit U2, thereby controlling the operation of the secondary battery manufacturing device 100. That is, the control unit U3 may control the operation of the cutting member based on the electrical signal transmitted from the sensor unit U2.

[0089] Specifically, when the power value applied to the vibrator 300 is the first power W1, the sensor unit U2 can recognize this and transmit the first electrical signal to the control unit U3. In this case, the control unit U3 can control the secondary battery manufacturing device 100 to continue normal operation without interrupting the operation. That is, the control unit U3 can control the cutting member to continue normal operation without interrupting the operation.

[0090] On the other hand, when the power value applied to the vibrator 300 is the second power W2, the sensor unit U2 can recognize this and transmit the second electrical signal to the control unit U3. In this case, the control unit U3 can interrupt the operation of the secondary battery manufacturing device 100. That is, the control unit U3 can interrupt the operation of the cutting member. Therefore, when the operation of the secondary battery manufacturing device 100 is interrupted by the control unit U3, the user or manager can determine that there is a defect in the sheet and take measures such as replacing the cutter so that normal cutting can be performed again.

[0091] In brief, the sensor unit U2 identifies a power range applied to the vibrator 300 , and the control unit U3 may control the secondary battery manufacturing apparatus 100 according to the power range.

[0092] When the secondary battery manufacturing apparatus 100 is controlled according to the secondary battery manufacturing system, since the secondary battery manufacturing apparatus 100 is systematically controlled, it is more convenient for the user or manager than for the user to directly identify the power range through the display unit U1 to maintain or interrupt the operation of the secondary battery manufacturing apparatus 100. In addition, in the manufacturing process, the user or manager does not need to continuously monitor the power range, which can reduce manufacturing costs such as labor costs.

[0093] Figure 7 It is a diagram showing a tool according to a modified example of the present disclosure. Figure 8 It shows that according to the setting Figure 7 A diagram of the position of the protrusions and the degree of adhesion of the secondary battery material. Figure 8 (a) is a graph showing the degree of adhesion of the secondary battery material when the first length is shorter than the second length, Figure 8 (b) is a graph showing the degree of adhesion of the secondary battery material when the first length is longer than the second length.

[0094] Figure 7 and Figure 8 The tool described in Figure 3 and Figure 4 A modification example of the embodiment of the present disclosure disclosed in , and a detailed description of the same configuration as the above configuration will be omitted.

[0095] Reference Figure 7 and Figure 8 The tool 210 according to a modified example of the present disclosure may include a protrusion 215 .

[0096] The protrusion 215 may be located on the side surface of the cutter 210. Specifically, the protrusion 215 may be located on the first surface 211 and the second surface 212 of the cutter 210, respectively. The protrusion 215 may be an area protruding from the first surface 211 and the second surface 212.

[0097] The protrusion 215 may be a structure that allows the secondary battery material to be separated from the cutter 210 in the shortest time after the sheet 110 is cut with the cutter 210. That is, when the sheet 110 is cut with the cutter 210 including the protrusion 215, the secondary battery material adhered to the cutter 210 may be separated from the cutter 210 while contacting the protrusion 215. Therefore, due to the protrusion 215, the contact time between the secondary battery material and the cutter 210 may be shortened. Therefore, even if the secondary battery material adheres to the cutter 210 due to frictional heat generated during cutting, due to the protrusion 215, the secondary battery material does not adhere when moving upward along the first surface 211 and the second surface 212 of the cutter 210, and may be separated from the cutter 210 as quickly as possible.

[0098] More specifically, the secondary battery material may be separated from the cutter 210 based on the protrusion start portion 215a. The protrusion start portion 215a may refer to a region where the protrusion 215 starts based on the vertex 214 where the first surface 211 and the second surface 212 contact each other.

[0099] Reference Figure 8 , the length from the vertex 214 to the protrusion start portion 215a may be a first length d1, and the height of the sheet 110 may be a second length d2. At this time, the first length d1 may be shorter than the second length d2.

[0100] Specifically, refer to Figure 8 (a), when the first length d1 is shorter than the second length d2, the protrusion 215 may have a height lower than the second length d2 and may be located on the first surface 211 and the second surface 212. In this case, even if the secondary battery material adheres to the cutter 210 due to frictional heat when the sheet 110 is cut, the adhered secondary battery material no longer moves upward along the first surface 211 and the second surface 212 due to the protrusion 215, but may be separated from the cutter 210.

[0101] On the other hand, referring to Figure 8 (b), when the first length d1 is longer than the second length d2, the protrusion 215 has a height higher than the second length d2 and may be located on the first surface 211 and the second surface 212. In this case, when the sheet 110 is cut, the secondary battery material does not separate after adhering to the cutter 210 due to frictional heat, but may remain adhered to the cutter 210 at a certain height or higher. Therefore, even if the protrusion 215 is provided, the possibility of causing defects in the cutting quality of the sheet 110 is high.

[0102] That is, due to the above reasons, it is preferred that the first length d1 is shorter than the second length d2.

[0103] exist Figure 7 and Figure 8 In the cutter 210 shown, the cutting load is concentrated on the protrusion 215, so the cutter 210 needs to be designed so that the life of the blade is not shortened. In addition, in order to keep the ultrasonic amplitude transmitted to the cutter 210 at the same state, the mass of other parts of the cutter 210 needs to be reduced by the mass increased by the protrusion 215. For example, the total mass of the cutter 210 excluding the protrusion 215 can be reduced by the mass of the protrusion 215, or as described later, Fig.11 As shown, the tool 210 may be designed to be provided with the recessed portion 216 together with the protrusion 215. That is, even if the tool 210 is provided with the protrusion 215, the total mass of the tool 210 must be equal to the total mass of the tool 210 without the protrusion 215.

[0104] In this figure, the protrusion 215 is shown to protrude sharply in a triangular shape, but the shape is not limited thereto, and any shape may be used as long as it is a protruding shape.

[0105] Fig. 9 2 is a diagram showing a tool according to another modified example of the present disclosure. Fig.10 It shows that according to the setting Fig. 9 A diagram showing the position of the concave portion and the degree of adhesion of the secondary battery material. Fig.10 (a) is a graph showing the degree of adhesion of the secondary battery material when the first length is shorter than the second length, Fig.10 (b) is a graph showing the degree of adhesion of the secondary battery material when the first length is longer than the second length.

[0106] Fig. 9 and Fig.10 The tool shown in Figure 3 and Figure 4 A modification example of the embodiment of the present disclosure disclosed in , and a detailed description of the same configuration as the above configuration will be omitted.

[0107] Reference Fig. 9 and Fig.10 A tool 210 according to another variation of the present disclosure may include a recessed portion 216 .

[0108] The recessed portion 216 may be located on the side surface of the tool 210. Specifically, the recessed portion 216 may be located on the first surface 211 and the second surface 212 of the tool 210, respectively. The recessed portion 216 may be a region that is hollowed out and recessed on the first surface and the second surface.

[0109] The recessed portion 216 may be a structure that allows the secondary battery material to be separated from the cutter 210 in the shortest time after the sheet 110 is cut with the cutter 210. That is, when the sheet 110 is cut with the cutter 210 including the recessed portion 216, the secondary battery material may be separated from the cutter 210 while being in contact with the recessed portion 216. Therefore, due to the recessed portion 216, the contact time between the secondary battery material and the cutter 210 may be shortened. Therefore, even if the secondary battery material adheres to the cutter 210 due to frictional heat generated during cutting, due to the recessed portion 216, the secondary battery material does not adhere while rising along the first surface 211 and the second surface 212 of the cutter 210, but may be separated from the cutter 210 as quickly as possible.

[0110] At this time, the radius of the recessed portion 216 can be 0.01mm or more. If the radius of the recessed portion 216 is less than 0.01mm, the recessed portion 216 is not identified as a concave-convex formed on the tool 210, and therefore, the secondary battery material can also adhere to the area where the recessed portion 216 is formed. Therefore, it is preferred that the radius of the recessed portion 216 is greater than 0.01mm. However, even if the radius of the recessed portion 216 is more than 0.01mm, the recessed portion 216 cannot always be formed. For example, the radius length of the recessed portion 216 should be less than the distance between the straight line (represented by a dotted line) extending from the vertex 214 perpendicular to the third surface 213 and the first surface 211 or the second surface 212 on which the recessed portion 216 is formed.

[0111] The secondary battery material may be separated from the cutter 210 with the concave start portion 216a as a reference. The concave start portion 216a may refer to an area where the concave portion 216 starts with the vertex 214 where the first surface 211 and the second surface 212 contact each other. At this time, the length from the vertex 214 to the concave start portion 216a may be a first length d1, and the height of the sheet 110 may be a second length d2.

[0112] More specifically, refer to Figure 8 (a), when the first length d1 is shorter than the second length d2, the concave portion 216 may have a height lower than the second length d2 to be located on the first surface 211 and the second surface 212. In this case, even if the secondary battery material adheres to the cutter 210 due to frictional heat when the sheet 110 is cut, the adhered secondary battery material no longer moves upward along the first surface 211 and the second surface 212 due to the concave portion 216, but can be separated from the cutter 210.

[0113] On the other hand, referring to Figure 8(b), when the first length d1 is longer than the second length d2, the concave portion 216 has a height higher than the second length d2 and is located on the first surface 211 and the second surface 212. In this case, when the sheet 110 is cut, the secondary battery material does not separate after adhering to the cutter 210 due to frictional heat, but may remain adhered to the cutter 210 at a certain height or higher. Therefore, even if the concave portion 216 is provided, the possibility of causing defects in the cutting quality of the sheet 110 is high.

[0114] That is, due to the above reasons, it is preferred that the first length d1 is shorter than the second length d2.

[0115] according to Fig. 9 and Fig.10 The cutter 210 needs to be designed to prevent the cutting load from being dispersed and the cutter life from being shortened such as blade breakage due to the configuration of the recessed portion 216. In addition, in order to keep the ultrasonic amplitude transmitted to the cutter 210 at the same state, the mass of other parts of the cutter 210 needs to be increased by the mass reduced by the recessed portion 216. For example, the mass of another area of ​​the cutter 210 where the recessed portion 216 is not provided may be increased, or as described later, Fig.11 As shown, the protrusion 215 can be added to the tool 210 together with the recess 216. That is, even if the tool 210 is provided with the recess 216, the total mass of the tool 210 must be equal to the total mass of the tool 210 without the recess 216.

[0116] In this figure, the concave portion 216 is shown as being hollowed out in a circular shape, but the shape is not limited thereto, and any shape may be used as long as it is a hollowed out shape.

[0117] Fig.11 2 is a diagram showing a tool according to another modified example of the present disclosure.

[0118] Fig.11 The tool described in Figures 7 to 10 A modification example of the embodiment of the present disclosure disclosed in , and a detailed description of the same configuration as the above configuration will be omitted.

[0119] Reference Fig.11 A tool 210 according to another modified example of the present disclosure may include a protruding portion 215 and a recessed portion 216 .

[0120] The protrusion 215 and the recess 216 may be located on each side surface of the tool 210. Specifically, the protrusion 215 and the recess 216 may be located on the first surface 211 and the second surface 212, respectively. That is, the protrusion 215 and the recess 216 may be located together on each of the first surface 211 and the second surface 212.

[0121] At this time, the mass added from the protrusion 215 may be equal to the mass reduced from the recessed portion 216. Therefore, even if the protrusion 215 is added, the recessed portion 216 is located together on the tool 210. Therefore, the total mass of the tool 210 including the protrusion 215 and the recessed portion 216 may be equal to the mass of the tool 210 without the protrusion 215 and the recessed portion 216.

[0122] Thus, the protrusion 215 and the recess 216 can be added to the cutter 210 so that the cutting load is not dispersed. On the contrary, by applying the protrusion 215 and the recess 216 to the cutter 210 at the same time, the total mass of the cutter 210 can be set to be equal to the total mass of the cutter 210 not including the protrusion 215 or the recess 216. Therefore, while the cutting load of the cutter 210 is not dispersed and the life of the cutter 210 is not shortened, the configuration of the protrusion 215 and the recess 216 prevents the secondary battery material from adhering to the cutter 210, thereby being able to improve the cutting quality of the sheet 110 and the quality of the electrode.

[0123] In the present disclosure, it is shown that the protrusion 215 is formed closer to the vertex 214 than the recess 216 and the recess 216 is formed farther from the vertex 214 than the protrusion 215, but it is not limited thereto. As an example, the recess 216 may be formed closer to the vertex 214 than the protrusion 215.

[0124] Fig.12 is a perspective view showing a secondary battery manufacturing apparatus according to another embodiment of the present disclosure. Fig.13 It is shown Fig.12 FIG. 1 is a diagram of a deformation example of a substrate.

[0125] Fig.12 and Fig.13 The secondary battery manufacturing apparatus described in the Figure 3 and Figure 4 A modification example of the embodiment of the present disclosure disclosed in , and a detailed description of the same configuration as the above configuration will be omitted.

[0126] Reference Fig.12 and Fig.13 , a secondary battery manufacturing apparatus 100 according to another embodiment of the present disclosure includes a substrate 130 , a cutting member 200 , and a vibrator 300 .

[0127] The substrate 130 may include an anti-damage layer 131 located on one surface of the substrate 130. In this case, the substrate 130 may have a Fig.12 The general plate-like shape shown, but may also have Fig.13 However, regardless of the shape of the substrate 130, it can convey the sheet 110 while moving in one direction.

[0128] The anti-damage layer 131 may be located on one surface of the substrate 130 where the sheet 110 is located, and may be positioned while facing the cutting member 200. The cutting member 200 may cut the sheet 110 while moving in the first direction D1, in which case the cutting member 200 may repeatedly contact the anti-damage layer 131.

[0129] The size of the anti-damage layer 131 may correspond to one surface of the substrate 130. Specifically, the size of the anti-damage layer 131 may be equal to or smaller than the size of one surface of the substrate 130. Fig.12 , the anti-damage layer 131 can be positioned while completely covering the substrate 130. Alternatively, as Fig.13 As shown, the damage layer 131 may be positioned while covering only a portion of one surface of the substrate 130. However, even if the damage prevention layer 131 is only located in some areas of the substrate 130, the damage prevention layer 131 must be located unconditionally in the area where the cutting member 200 contacts the substrate 130.

[0130] The cutter 210 and the substrate 130 may not contact each other. This is because if the cutter 210 and the substrate 130 contact each other, the cutter 210 may be damaged. Therefore, in order to prevent damage to the cutter 210, an anti-damage layer 131 is provided on the substrate 130, and the cutter 210 may contact the anti-damage layer 131. As a result, the cutter 210 is not damaged because it is not in direct contact with the substrate 130, thereby extending the life of the cutter 210 and reducing the cost of the equipment.

[0131] The damage prevention layer 131 may be coated and positioned on one surface of the substrate 130. Alternatively, the damage prevention layer 131 may be separately manufactured in a separate process and then fixed to one surface of the substrate 130 using an adhesive or the like.

[0132] As an example, the damage prevention layer 131 may be made of a 5H S To 85H S Specifically, when the anti-damage layer 131 is made of a material having a Shore hardness of 5H SWhen the anti-damage layer 131 is made of a material having a Shore hardness of 85H or less, the secondary battery material such as the sheet 110 cannot be fixed to the anti-damage layer 131. Therefore, the secondary battery material cannot be cut due to the shear force of the cutter 210 described later, and the possibility of its breakage or separation is high. S When the material of the Shore hardness is above 1.5, the cutter 210 may be severely worn when the damage prevention layer 131 and the cutter 210 rub against each other. In this case, due to foreign matter such as iron (Fe) generated from the worn cutter 210, the cutting quality of the sheet 110 and the quality of the electrode may be deteriorated.

[0133] In this case, the anti-damage layer 131 may be PVC (polyvinyl chloride), silicone, MC nylon (monocast nylon), Teflon, PET (polyethylene terephthalate), etc. Even when vibration is transmitted from the cutter 210 to the anti-damage layer 131, the anti-damage layer 131 formed of the above materials does not damage the cutter 210, thereby not generating foreign matter such as iron (Fe), and can improve the cutting quality of the sheet 110 and the quality of the electrode.

[0134] Furthermore, since the material constituting the damage prevention layer 131 has a high thermal deformation temperature, their shapes are not deformed even when heat is applied due to vibration of the cutter 210 during cutting, thereby ensuring the cutting quality of the secondary battery material even at high temperatures.

[0135] As another example, the damage-resistant layer 131 may be an extreme performance fiber with high strength and high elastic modulus. Specifically, the damage-resistant layer 131 may be a material with a tensile strength of more than 20 g / d and an elastic modulus of more than 500 g / d. As an example, the damage-resistant layer is a bulletproof / sword-proof material, which may be p-aramid (para-aramid) or UHMWPE (ultra-high molecular weight polyethylene).

[0136] Since the anti-damage layer 131 is configured as described above, even when the anti-damage layer 131 contacts the cutter 210 of the cutting member 200, the anti-damage layer 131 is not damaged or cut. That is, when cutting the sheet 110, the cutting member 200 can contact the anti-damage layer 131 multiple times without contacting the substrate 130. Therefore, even if the cutter 210 is repeatedly driven, the substrate 130 is not damaged. Therefore, the cutting process can be continuously performed, and the process efficiency can be improved.

[0137] In addition, due to the anti-damage layer 131, the wear of the blade of the cutter 210 can be minimized. Therefore, the sheet 110 can be cut while preventing damage to the blade of the cutter 210, so the cutting quality of the electrode can be improved. In addition, frequent replacement of the cutter 210 can be prevented, and the process cost can be reduced.

[0138] The battery module and the battery pack including the battery module can be applied to various devices. Such devices can be applied to vehicle devices such as electric bicycles, electric vehicles, and hybrid electric vehicles, but the present disclosure is not limited thereto and can also be applied to various devices that can use the battery module and the battery pack including the battery module, which falls within the scope of the present disclosure.

[0139] The present invention has been described in detail with reference to the preferred embodiments of the present invention. However, it will be appreciated by those skilled in the art that the scope of the present disclosure is not limited thereto, and various modifications and improvements may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is limited by the appended claims and their equivalents.

[0140] [Reference Symbols]

[0141] 100: Secondary battery manufacturing device 110: Sheet material

[0142] 130: Base

[0143] 200: Cutting components

[0144] 210: Knife

[0145] 215: The bulge

[0146] 216: concave part

[0147] 220: Support

[0148] 221: First hole

[0149] 300: Vibrator

[0150] 310: Second hole.

Claims

1. A knife having a blade, the knife comprising: a first surface, a second surface, and a third surface, wherein the first surface and the second surface extend toward a first direction as a cutting direction at a predetermined angle, and the third surface extends toward a second direction perpendicular to the first direction, wherein one end of the first surface and one end of the second surface form a vertex of the blade while contacting each other, One end and the other end of the third surface are in contact with the other end of the first surface and the other end of the second surface respectively.

2. The tool according to claim 1, wherein: The first surface and the second surface are provided with protrusions, and the protrusions are protruding areas.

3. The tool according to claim 2, wherein: The protrusion includes a protrusion start portion, and the protrusion start portion is a region where the protrusion starts with the vertex as a reference. The length from the apex to the protrusion start portion is shorter than the height of the sheet. 4 . The tool according to claim 1 , further comprising a recessed portion, the recessed portion being an area hollowed out to be recessed from the first surface and the second surface.

5. The tool according to claim 4, wherein: The concave portion includes a concave starting portion, and the concave starting portion is a region where the concave portion starts with the apex as a reference. The length from the apex to the concave start portion is shorter than the height of the sheet.

6. The tool according to claim 4, wherein: The radius of the concave portion is greater than 0.01 mm.

7. The cutting tool according to claim 1, further comprising: protrusions, the protrusions being areas protruding from the first surface and the second surface, and The concave portion is a region that is hollowed out and concave from the first surface and the second surface.

8. The cutting tool of claim 1, wherein: The angle of the vertex is less than 120 degrees.

9. The cutting tool of claim 1, wherein: The cutter is cermet. 10 . A secondary battery manufacturing device comprising the cutter according to claim 1 .

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