Secondary battery manufacturing apparatus, secondary battery manufacturing method using same, and secondary battery manufacturing using same

Abstract

The present invention relates to a secondary battery manufacturing apparatus, a secondary battery manufacturing method using the same, and a secondary battery manufactured using the same, and more particularly, to a secondary battery manufacturing apparatus, a secondary battery manufacturing method, and a secondary battery manufactured using the same. The present invention relates to a secondary battery manufacturing apparatus for cutting an electrode tab of a secondary battery, a secondary battery manufacturing method using the same, and a secondary battery manufactured using the same. The present invention provides a secondary battery manufacturing apparatus for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly in which electrodes and separators are alternately stacked; and an electrode tab attached to the electrode, the apparatus comprising: a cutter located on one side of the electrode tab and moving toward the electrode tab to cut an area of the electrode tab to be cut; and a fixing mold provided on the other side portion of the electrode tab to be staggered with respect to the cutter, in which the cutter includes: a pressing surface that presses the electrode tab; and an inclined surface provided at a position corresponding to the region to be cut and extending obliquely away from the electrode tab from an end portion of the pressing surface.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0091361, filed on Jul. 22, 2022, and Korean Patent Application No. 10-2023-0095316, filed on Jul. 21, 2023, which are hereby incorporated by reference in their entirety.

[0002] The present invention relates to an apparatus for manufacturing a secondary battery, a method for manufacturing a secondary battery using the apparatus, and a secondary battery manufactured using the apparatus, and more particularly, to an apparatus for manufacturing a secondary battery for cutting electrode tabs of a secondary battery, a method for manufacturing a secondary battery using the apparatus, and a secondary battery manufactured using the apparatus. Background Art

[0003] According to a living environment surrounded by various electric and electronic devices, when AC power to be supplied to a building is not available or DC power is required, a battery (battery cell) that generates electric energy through a physical or chemical reaction to supply the generated electric energy to the outside is used.

[0004] In such batteries, primary batteries and secondary batteries are generally used, which are chemical batteries using chemical reactions. Here, primary batteries are generally referred to as dry batteries and are consumable batteries. In addition, secondary batteries are rechargeable batteries, which are made of materials that can be repeated many times using the redox process between electric current and substances. When the material is subjected to a reduction reaction by electric current, the power source is charged, and when the material is subjected to an oxidation reaction, the power source is discharged. This charge-discharge is repeated to generate electricity.

[0005] Such a secondary battery generally has a structure including: an electrode assembly in which electrodes and separators are alternately stacked; and an electrode tab to which each of the electrodes is attached. Here, the electrode tab is processed to be cut by a cutter or the like, and after processing, the electrode tab is attached to the electrode by welding connection or the like.

[0006] The electrode assembly as described above is accompanied by expansion due to an activation process, etc. Here, there is a problem in that burrs formed from electrode tabs by a cutting process damage the electrode, thereby causing pinholes or cracks in the electrode.

[0007] Therefore, it is necessary to develop a technology to solve the above problems. Summary of the invention

[0008] Technical issues

[0009] The present invention has been invented to solve the above problems, and an object of the present invention is to provide an apparatus for manufacturing a secondary battery, a method for manufacturing a secondary battery using the apparatus, and a secondary battery manufactured using the apparatus, the apparatus manufacturing an electrode tab capable of preventing an electrode from being damaged.

[0010] Technical Solutions

[0011] The present invention provides an apparatus for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly, in which electrodes and separators are alternately stacked; and electrode tabs, each of the electrodes being attached with an electrode tab, the apparatus comprising: a cutter, the cutter being arranged at one side of the electrode tab to move toward the electrode tab so as to cut a portion of the electrode tab to be cut; and a fixed mold, the fixed mold being arranged to be staggered with the cutter at the other side of the electrode tab, wherein the cutter comprises: a pressing surface, the pressing surface being configured to press the electrode tab; and an inclined surface, the inclined surface being arranged at a position corresponding to the portion to be cut and extending obliquely from an end of the pressing surface away from the electrode tab.

[0012] An end portion of the inclined surface may have a concave shape that is concave inwardly.

[0013] The inclined surface may extend to be inclined at an angle of 30 to 70 degrees.

[0014] One end portion of the fixing mold may be disposed at a position corresponding to a portion of the electrode tab to be cut and have a convex shape protruding outward.

[0015] The apparatus may further include a transfer part transferring the electrode coupled to the electrode tab to a lower side of the electrode tab, wherein the fixing mold may be disposed above the electrode tab, and the cutter may be disposed under the electrode tab to move upward.

[0016] The secondary battery may include a cylindrical secondary battery.

[0017] The present invention provides a method for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly, in which electrodes and separators are alternately stacked; and electrode tabs, each of the electrodes being attached with an electrode tab, the method comprising: an electrode tab cutting process for cutting a portion of the electrode tab to be cut; and an electrode tab attaching process for attaching the electrode tab to the electrode, wherein, during the electrode tab cutting process, a cutter moves toward the electrode tab to cut the portion of the electrode tab to be cut, and the cutter comprises: a pressing surface that presses the electrode tab; and an inclined surface that is disposed at a position corresponding to the portion to be cut and extends obliquely from an end of the pressing surface away from the electrode tab.

[0018] In the electrode tab cutting process, a cutter disposed under the electrode tab may move upward relative to the electrode tab to cut the electrode tab, and in the electrode tab attaching process, the electrode tab may be attached to an upper side of the electrode.

[0019] A secondary battery according to the present invention includes: an electrode assembly in which electrodes and separators are alternately stacked; an electrode tab to which each of the electrodes is attached; and a battery box in which the electrode assembly and the electrode tab are accommodated, wherein burrs generated on edges of the electrode tabs due to cutting can protrude in a direction facing the battery box.

[0020] The corner of the electrode tab may be provided in a curved shape having a curvature radius on a plane.

[0021] Corners of the electrode webs having a radius of curvature can be arranged on the electrode.

[0022] A curvature radius of a corner of the electrode tab may be greater than 1 / 2 of a width of the electrode tab.

[0023] The electrode assembly may be wound in a state in which electrodes and separators are sequentially stacked, and the battery case may have a cylindrical shape and be configured to accommodate the electrode assembly.

[0024] Beneficial Effects

[0025] The present invention can have the effect of reducing the protruding angle of burrs on the electrode tab to minimize damage to the electrode caused by the electrode tab by cutting the electrode tab using a cutter having an inclined surface extending obliquely away from the electrode tab from a pressing surface pressing the electrode tab.

[0026] In addition, the present invention can have the effect of forming the corners of the electrode tabs into a rounded shape to minimize damage to the electrode due to the electrode tabs by cutting the electrode tabs using a cutter whose end of the inclined surface has a concave shape concave inward.

[0027] In addition, the present invention may include a transfer portion configured to transfer the electrode to the lower side of the electrode tab. Therefore, the cutter may be disposed below the electrode tab to cut the electrode tab using the cutter moving upward so that the burr protrudes from the electrode tab in the opposite direction of the electrode, i.e., in the direction facing the battery case, thereby minimizing damage to the electrode caused by the electrode tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view of an apparatus for manufacturing a secondary battery according to Embodiment 1 of the present invention.

[0029] Figure 2It shows that when viewed along the direction AA Figure 1 A side cross-sectional view of a cutter of an apparatus for manufacturing a secondary battery.

[0030] Figure 3a It is a diagram of Figure 1 A side cross-sectional view of an electrode tab manufactured by an apparatus for manufacturing a secondary battery.

[0031] Figure 3b It is a diagram of Figure 1 A side cross-sectional view of another electrode tab manufactured by an apparatus for manufacturing a secondary battery.

[0032] Figure 4 It's a picture. Figure 1 Detailed plan view of a cutter in an apparatus for manufacturing a secondary battery.

[0033] Figure 5 It is a diagram of Figure 1 A conceptual diagram of a state in which an electrode tab manufactured by an apparatus for manufacturing a secondary battery is attached to an electrode.

[0034] Figure 6a It is a diagram of Figure 1 A conceptual diagram of a state in which an electrode tab manufactured by an apparatus for manufacturing a secondary battery is disposed between an electrode and a battery case.

[0035] Figure 6b is a conceptual diagram illustrating a state in which an electrode tab manufactured by an apparatus for manufacturing a secondary battery according to the related art is disposed between an electrode and a battery case.

[0036] Figure 7 : is a flowchart illustrating the sequence in the method for manufacturing a secondary battery according to Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0037] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in several different forms and is not limited or restricted by the following examples.

[0038] In order to explain the present invention clearly, the detailed description of the parts not related to the specification or the related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and in this specification, the reference numerals are added to the components in each figure. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0039] In addition, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe and interpret his or her invention.

[0040] Equipment for manufacturing secondary batteries

[0041] The present invention provides an apparatus 100 for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly in which electrodes 20 and separators (not shown) are alternately stacked; and an electrode tab 10, the electrode tab 10 being attached to the electrode 20, the apparatus 100 comprising: a cutter 120, the cutter 120 being arranged on one side of the electrode 10 to move to the electrode tab 10, thereby cutting a portion of the electrode tab 10 to be cut; and a fixed mold, the fixed mold being arranged on the other side of the electrode tab 10 to be staggered with the cutter 120, and the cutter 120 comprising: a pressing surface 121, the pressing surface 121 pressing the electrode tab 10; and an inclined surface 122, the inclined surface 122 being arranged at a position corresponding to the portion to be cut and extending obliquely from the end of the pressing surface 121 away from the electrode tab.

[0042] Here, the electrode assembly may be configured such that the electrodes 20 and the separator (not shown) are alternately stacked and may have various structures. Specifically, the electrode assembly may have a structure in which the positive electrode collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode collector are sequentially stacked so that the positive electrode active material layer disposed on one surface of the separator faces the negative electrode active material layer disposed on the other surface of the separator.

[0043] The electrode assembly may be wound in a state in which the electrodes 20 and the separators are sequentially stacked, and then housed in a battery case 30 to be described below.

[0044] Each of the electrodes 20 may be attached with at least one or more electrode tabs 10. Here, the electrode tabs 10 may be connected to electrode leads (not shown) protruding outside the battery case 30, and thus, the electrode assembly inside the battery case 30 may be electrically connected to an external electrical device or an external secondary battery, etc. The electrode tabs 10 may be coupled to the electrodes 20 by laser welding, ultrasonic welding, resistance welding, etc.

[0045] In addition, the electrode tab 10 may be attached to the electrode 20 by welding, and therefore, at least one or more welding regions a may be provided on the electrode tab 10 and the electrode 20. Here, the welding region a may be understood as a region in the electrode tab 10 or the electrode 20 where deformation occurs during a process of pressing and / or heating the electrode tab 10 and the electrode 20 during welding.

[0046] like Figure 1 As illustrated, before the electrode tab 10 is attached to the electrode 20 , the electrode tab 10 may be cut by a cutter 120 , and then processed to have a size and shape desired by a user.

[0047] Specifically, the cutter 120 may be disposed at one side of the electrode tab 10 to move toward the electrode tab 10 and may cut a portion to be cut of the electrode tab 10. Here, the portion to be cut may be a portion of the electrode tab 10 that is cut and processed by the cutter 120, and may be understood as a portion corresponding to a cutting portion of the electrode tab 10 on which a cutting process is performed.

[0048] In more detail, the cutter 120 may be disposed at one side of the electrode tab 10 to move toward the electrode tab 10 so as to process the electrode tab 10. For example, the cutter 120 may be disposed at an upper side or a lower side of the electrode tab 10 to move toward the electrode tab 10.

[0049] Cutter 120 may have various structures.

[0050] For example, Figure 2 As shown, the cutter 120 may include: a pressing surface 121, which presses the electrode tab 10; and an inclined surface 122, which is provided at a position corresponding to the portion to be cut and extends obliquely from the end of the pressing surface 121 away from the electrode tab 10. Here, Figure 2 is a side cross-sectional view of the cutter 120 , but note that the electrode tab 10 is additionally illustrated above the cutter 120 to help understand the position and movement direction of the cutter 120 .

[0051] Here, the dotted line indicated on the cutter 120 may indicate a region distinguishing the pressing surface 121 and the inclined surface 122 on the cross section of the cutter 120 , but note that this does not mean that the pressing surface 121 and the inclined surface 122 are separated from each other.

[0052] Here, the pressing surface 121 may be a surface provided at a position on the cutter 120 facing the electrode tab 10 to press a surface of the electrode tab 10, and may have various structures. Figure 2As shown in the figure, the pressing surface 121 may have the following structure: the structure is parallel to one surface of the electrode tab 10 (with Figure 2 The electrode tab 10 extends in a direction parallel to the X direction in the figure to uniformly press one surface of the electrode tab 10.

[0053] The inclined surface 122 may be provided at a position corresponding to a portion to be cut, and may be configured to extend obliquely away from the electrode tab 10 from an end of the pressing surface 121 , and may also have various structures.

[0054] For example, Figure 2 As shown in the figure, the inclined surface 122 may be arranged to extend obliquely so that the distance between the end of the pressing surface 121 and the electrode tab 10 ( Figure 2 in the Z direction) increases.

[0055] The inclined surface 122 may be provided at a position corresponding to a portion to be cut, and thus, when the electrode tab 10 is cut, formation of a burr generated by cutting at a cut portion of the electrode tab 10 and a protruding height of the burr may be minimized.

[0056] The inclined surface 122 may be provided to be inclined at various inclination angles θ from the pressing surface 121. However, since the protrusion height of burrs generated at the cut portion of the electrode tab 10 increases in proportion to the inclination angle θ of the inclined surface 122, it is preferred that the inclination angle θ is less than a specific angle.

[0057] In more detail, Figure 3a and Figure 3b The electrode tab 10 is illustrated in which the inclined surface 122 is cut by a cutter 120 having different inclination angles θ. That is, Figure 3a The electrode tab 10 in the embodiment may be an electrode tab 10 provided by cutting the electrode tab 10 using a cutter 120 having an inclined surface 122 with an inclined angle θ of 30 degrees, and Figure 3b The electrode tab 10 in the embodiment may be an electrode tab 10 provided by cutting the electrode tab 10 using a cutter 120 having an inclined surface 122 with an inclined angle θ of 50 degrees. Figure 3a to Figure 3b It can be seen that, Figure 3b The protruding height of the burr of the electrode contact 10 is higher than Figure 3a Therefore, it can be seen that the inclination angle θ needs to be smaller than a certain angle.

[0058] However, even in consideration of this structure, if the inclination angle θ is too small, a problem of difficulty in processing the inclined surface 122 may occur when manufacturing the cutter 120, and thus, the inclination angle θ may not be limited to a predetermined angle or more.

[0059] Therefore, it may be desirable that the inclined surface 122 extends obliquely at an angle of 30 to 70 degrees from the pressing surface 121. As described above, this is because when the inclination angle θ is less than 30 degrees, when manufacturing the cutter 120, the processing of the inclined surface 122 may be difficult, and when the inclination angle θ exceeds 70 degrees, the protruding height of the burr may be too large to adversely affect the quality of the secondary battery.

[0060] The inclined surface 122 may have various shapes.

[0061] Here, one end of the inclined surface 122 may have a concave shape that is concave inwardly, such as Figure 4 In this case, if Figure 5 As illustrated, the corners of the electrode tab 10 cut by the cutter 120 may not define a right angle, but may be provided in a curved shape having a radius of curvature on a plane.

[0062] Therefore, after the electrode tab 10 is attached to the electrode 20 , even if the electrode assembly expands due to an activation process or the like, stress concentration at the corner of the electrode tab 10 may be relieved to prevent the electrode 20 from being damaged.

[0063] The electrode tab 10 cut by the cutter 120 may be fixedly supported by the fixed mold 110. Here, the fixed mold 110 may be configured to be disposed to intersect with the cutter 120 at the other side of the electrode tab 10, and may have various configurations.

[0064] Specifically, the fixing mold 110 may be arranged so as not to interfere with the cutter 120 at the other side of the electrode tab 10. In addition, the fixing mold 110 may be understood as a configuration that fixes and supports a partial area of ​​the electrode tab 10, and when the electrode tab 10 is pressed by the cutter 120, the electrode tab 10 is easily cut along the portion to be cut.

[0065] Here, when the cutter 120 is disposed at one side of the electrode tab 10, the fixing mold 110 may be disposed at the other side of the electrode tab 10. In this case, the fixing mold 110 may be disposed at an upper side or a lower side of the electrode tab 10.

[0066] The fixed mold 110 may have various shapes.

[0067] For example, as described above, when the end of the inclined surface 122 of the cutter 120 has a concave shape concave inwardly, one end of the fixing mold 110 may be disposed at a position corresponding to a portion to be cut of the electrode tab 10 and may have a convex shape protruding outwardly.

[0068] Here, the protruding convex shape of one end of the fixed mold 110 may be set to correspond to the concave concave shape of the end of the inclined surface 122 of the cutter 120. In this case, there is an advantage that the fracture surface generated by cutting the electrode tab 10 is smoothly provided by minimizing the gap between the fixed mold 110 and the cutter 120.

[0069] The apparatus 100 for manufacturing a secondary battery according to the present invention may further include a transfer part (not shown) that transfers the electrode 20 coupled to the electrode tab 10 to the lower side of the electrode tab 10. The transfer part (not shown) may have any configuration as long as the transfer part can transfer the electrode 20, and the transfer part may be configured as, for example, a conveyor belt or the like.

[0070] In addition, the electrode tab 10 cut by the cutter 120 may be moved to the electrode 20 transferred by the transfer part (not shown). In other words, the electrode tab 10 may be cut by the cutter 120 and then moved to the top surface of the electrode 20 transferred on the transfer part (not shown).

[0071] When the transfer part as described above is provided, the above-mentioned fixed mold 110 may be provided above the electrode tab 10 , and the cutter 120 may be preferably provided below the electrode tab 10 to move upward.

[0072] This is because, when the transfer unit transfers the electrode 20 to the lower side of the electrode tab 10, Figure 5 As illustrated, the electrode tab 10 is attached to the upper side of the electrode 20. Here, when the cutter 120 moves upward from the lower side of the electrode tab 10 to cut the electrode tab 10, burrs generated on the edge of the electrode tab 10 may be disposed upward.

[0073] In addition, compared with the case where the electrode 20 is welded to the top surface of the electrode tab 10 when the cut electrode tab 10 is set, it is more efficient to weld the electrode tab to the top surface of the electrode 20 when the electrode 20 is set, and therefore, it is preferred that the cutter 120 is set under the electrode tab 10 to move upward so that the electrode tab 10 is attached to the upper side of the electrode 20.

[0074] Specifically, the electrode 20 may be manufactured by applying an active material to an electrode plate made of metal. Due to the characteristics of the electrode 20, the size of the electrode 20 may be larger than the size of the cut electrode tab 10, and the weight of the electrode 20 may be heavier than the weight of the cut electrode tab 10. Therefore, it is desirable to attach the electrode tab 10 to the top surface of the electrode 20 in a state where the electrode 20 is set.

[0075] In addition, due to the characteristics of the welding process, it is more efficient to perform welding by defining a welding area a on the top surface of the electrode tab 10 in a state where the electrode tab 10 is disposed on the top surface of the electrode 20, compared to a case where welding is performed by pressing the bottom surface of the electrode tab 10 in a state where the electrode tab 10 is disposed on the bottom surface of the electrode 20. Therefore, similarly, it is preferred that the cutter 120 is disposed under the electrode tab 10 to move upward so that the electrode tab 10 is attached to the upper side of the electrode 20.

[0076] In this case, the burrs generated by the cutting on the electrode tab 10 may protrude in the opposite direction of the electrode 20 , thereby having an effect of preventing the electrode 20 from being damaged by the burrs.

[0077] Specifically, the secondary battery manufactured by the apparatus 100 for manufacturing a secondary battery may include a cylindrical secondary battery, and due to the manufacturing characteristics of the cylindrical secondary battery, the electrode 20 may be wound in a state where the electrode tab 10 is welded to the electrode 20. That is, the electrode 20 may be set in a wound shape and then accommodated in a cylindrical battery can, and the burr of the electrode tab 10 may be set to face the inner surface of the battery can. In a state where the electrode 20 having a wound shape, that is, the electrode assembly is accommodated in the battery can, an activation process may be performed, and then, the top cover may cover the upper side of the opened battery can to manufacture a cylindrical secondary battery.

[0078] The electrode 20 may include a negative electrode connected to the inner surface of the battery can and having a negative polarity and a positive electrode connected to the top cover and having a positive polarity. In this case, the electrode 20 to which the cut electrode tab 10 is welded may be a negative electrode.

[0079] That is, in a state where the electrode tab 10 is welded and connected to the negative electrode so that the burrs of the electrode tab 10 protrude in the opposite direction of the negative electrode, the positive electrode and the negative electrode can be wound so that the burrs of the electrode tab 10 face the inner surface of the battery can, and then, the burrs of the electrode tab 10 can be connected to the inner surface of the battery can.

[0080] Therefore, in a state where the cutter 120 provided at the lower side of the electrode tab 10 moves upward to generate the burr of the electrode tab 10 upward, the cut electrode tab 10 can be welded and coupled to the top surface of the electrode 20 provided on the transmission part, and the electrode 20, that is, the negative electrode, can be wound to be accommodated in the battery can so that the burr of the electrode tab 10 faces outward, and thus, the burr of the electrode tab 10 can be coupled to the inner surface of the battery can instead of the electrode 20. Therefore, the electrode 20 is not damaged by the burr of the electrode tab 10.

[0081] This can refer to Figure 6a to Figure 6b For a more detailed explanation.

[0082] Specifically, Figure 6a is a diagram illustrating a state in which the electrode tab 10 is disposed at the upper side portion of the electrode 20 and the burrs generated on the edge of the electrode tab 10 protrude upward so that the burrs are disposed in a direction facing the battery case 30, which is the opposite direction of the electrode 20. In this case, since the protruding direction of the burrs is opposite to that of the electrode 20, the electrode 20 is not damaged by the burrs even if the electrode 20 expands.

[0083] in addition, Figure 6b 1 is a diagram illustrating a state in which the electrode tab 10 is disposed at the upper side of the electrode 20 and the burrs generated on the edge of the electrode tab 10 protrude downward so that the burrs are disposed in a direction facing the electrode 20. In this case, since the protruding direction of the burrs faces the electrode 20, even if the electrode 20 expands, there is a problem that the electrode 20 is damaged by the burrs, thereby deteriorating the quality of the secondary battery.

[0084] That is, in the present invention, when the electrode tab 10 is attached to the upper side of the electrode 20 as described above, the cutter 120 can be disposed below the electrode tab 10, and the cutter 120 can be moved upward to cut the electrode tab 10 so that the burrs protrude in the opposite direction of the electrode 20, thereby preventing the electrode 20 from being damaged.

[0085] As described above, when the electrode tab 10 is attached to the lower side of the electrode 20, the cutter 120 can be disposed above the electrode tab 10 and the cutter 120 can be moved downward to cut the electrode tab 10 so that the burrs protrude in the opposite direction of the electrode 20, thereby naturally preventing the electrode 20 from being damaged.

[0086] Method for manufacturing a secondary battery

[0087] like Figure 7 As illustrated, the present invention provides a method for manufacturing a secondary battery, the secondary battery including: an electrode assembly in which electrodes 20 and separators are alternately stacked; and electrode tabs 10 to each of which the electrodes 20 are attached, the method including: an electrode tab cutting process S10 of cutting a portion to be cut of the electrode tab 10; and an electrode tab attaching process S20 of attaching the electrode tab 10 to the electrode 20. In the electrode tab cutting process S10, a cutter 120 moves toward the electrode tab 10 to cut the portion to be cut of the electrode tab 10, and the cutter 120 includes: a pressing surface 121 that presses the electrode tab 10; and an inclined surface that is provided at a position corresponding to the portion to be cut and extends obliquely away from the electrode tab 10 from an end of the pressing surface.

[0088] Here, the electrode tab cutting process S10 may be a process of cutting a to-be-cut portion of the electrode tab 10 , and may be performed in various ways.

[0089] Specifically, the electrode tab cutting process S10 may be performed by moving the cutter 120 toward the electrode tab 10 to cut a to-be-cut portion of the electrode tab 10 .

[0090] In more detail, the electrode tab cutting process S10 may be performed by moving the cutter 120 to the upper side or the lower side of the electrode tab 10 according to the positions of the cutter 120 and the electrode tab 10 to cut the electrode tab 10 .

[0091] Here, in the electrode tab cutting process S10 , the positions of the cutter 120 and the electrode tab 10 and the moving direction of the cutter 120 may vary considering the position where the electrode tab 10 is attached to the electrode 20 in the electrode tab attaching process S20 to be described later and the formation direction of the burr.

[0092] For example, when the electrode tab 10 is attached to the upper side of the electrode 20 in the electrode tab attaching process S20 to be described later, the electrode tab cutting process S10 may be performed while the cutter 120 disposed below the electrode tab 10 moves upward relative to the electrode tab 10 to cut the electrode tab 10 .

[0093] Here, the cutter 120 may include a pressing surface 121 that presses the electrode tab 10, and an inclined surface 122 that is provided at a position corresponding to the portion to be cut and extends obliquely from an end of the pressing surface 121 away from the electrode tab 10. Here, more specific contents of the cutter 120 will be replaced by the above contents.

[0094] In addition, the electrode tab attaching process S20 may be a process of attaching the electrode tab 10 to the electrode 20 and may be performed in various ways.

[0095] Specifically, the electrode tab attaching process S20 may be performed by attaching the electrode tab 10 to the electrode 20 through laser welding, ultrasonic welding, resistance welding, etc. Here, the electrode tab 10 may be attached to an upper side or a lower side of the electrode 20 .

[0096] Secondary battery

[0097] The present invention can provide a secondary battery, which includes: an electrode assembly in which electrodes 20 and separators are alternately stacked; electrode tabs 10, each of the electrodes 20 being attached with an electrode tab 10; and a battery box 30, in which the electrode assembly and the electrode tabs 10 are accommodated, and in the battery box 30, burrs on the edges of the electrode tabs 10 generated by cutting protrude in a direction facing the battery box 30.

[0098] Here, the specific details about the electrode 20 and the electrode tab 10 will be replaced by the above-mentioned details. In addition, the secondary battery may be various types, for example, a cylindrical secondary battery.

[0099] In addition, the battery case 30 may be configured to accommodate the electrode assembly and the electrode tab 10, and may have various structures. For example, the battery case 30 may have various shapes and materials, such as a cylindrical shape, a prismatic shape, and a pouch shape.

[0100] The secondary battery may be a secondary battery manufactured by the above-described apparatus 100 for manufacturing a secondary battery and the method for manufacturing a secondary battery. Here, the electrode tab 10 may be cut by the above-described fixing mold 110 and the cutter 120.

[0101] Here, the secondary battery can have the following structure: in this structure, the burrs generated by cutting on the edge of the electrode tab 10 are arranged in the opposite direction of the electrode 20, that is, in the direction facing the battery box 30, and therefore, damage to the electrode 20 due to the burrs of the electrode tab 10 can be prevented.

[0102] In the present invention, the corner of the electrode tab 10 may be set to a curved shape having a curvature radius on a plane. That is, the corner of the electrode tab 10 may have a rounded shape. Therefore, stress concentration at the corner of the electrode tab 10 may be relieved.

[0103] In particular, the corner of the electrode tab 10 having the curvature radius may be disposed on the electrode 20 , and thus, the problem that the corner of the electrode tab 10 tears the electrode 20 or damages the electrode 20 may be prevented to improve the stability of the secondary battery.

[0104] The radius of curvature of the corner of the electrode tab 10 may be set in various ways. However, in order to alleviate stress concentration at the corner of the electrode tab 10, it is preferred that the radius of curvature of the corner of the electrode tab 10 is greater than 1 / 2 of the width W of the electrode tab 10. For example, when the width W of the electrode tab 10 is 40 mm, the radius of curvature of the corner of the electrode tab 10 may be greater than 20 mm.

[0105] While embodiments of the present invention have been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0106] [Description of Reference Signs]

[0107] 10: Electrode contact

[0108] 20: Electrode

[0109] 30: Battery box

[0110] 100: Equipment for manufacturing secondary batteries

[0111] 110: Fixed mold

[0112] 120: Cutter

[0113] 121: Press the surface

[0114] 122: Sloped surface

[0115] S10: Electrode tab cutting process

[0116] S20: Electrode tab attachment process

[0117] θ: Tilt angle

[0118] W: Width of electrode tab

[0119] a: welding area

Claims

1. An apparatus for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly in which electrodes and separators are alternately stacked; and an electrode tab to which each of the electrodes is attached, the device comprising: a cutter provided at one side of the electrode tab to move toward the electrode tab so as to cut a portion of the electrode tab to be cut; and a fixed mold, the fixed mold being arranged at the other side of the electrode tab to be staggered with the cutter, Wherein, the cutter comprises: a pressing surface configured to press the electrode tab; and An inclined surface is provided at a position corresponding to the portion to be cut and extends obliquely from an end of the pressing surface away from the electrode tab.

2. The device according to claim 1, wherein: An end portion of the inclined surface has a concave shape that is concave inwardly.

3. The device according to claim 1, wherein: The inclined surface extends to be inclined at an angle of 30 to 70 degrees.

4. The device according to claim 2, wherein: One end portion of the fixed mold is disposed at a position corresponding to the portion of the electrode tab to be cut and has a convex shape protruding outward.

5. The apparatus according to claim 1, further comprising a transmission part that transmits the electrode coupled to the electrode tab to a lower side of the electrode tab, in, The fixed mold is arranged above the electrode tab, and The cutter is disposed below the electrode tab to move upward.

6. The device according to claim 1, wherein: The secondary battery includes a cylindrical secondary battery.

7. A method for manufacturing a secondary battery, the secondary battery comprising: an electrode assembly in which electrodes and separators are alternately stacked; and an electrode tab to which each of the electrodes is attached, the method comprising: an electrode tab cutting process of cutting a portion of the electrode tab to be cut; and an electrode tab attaching process of attaching the electrode tab to the electrode, Wherein, during the electrode tab cutting process, the cutter moves toward the electrode tab to cut the portion of the electrode tab to be cut, and The cutter comprises: a pressing surface that presses the electrode tab; and An inclined surface is provided at a position corresponding to the portion to be cut and extends obliquely from an end of the pressing surface away from the electrode tab.

8. The method according to claim 7, wherein: During the electrode tab cutting process, the cutter disposed below the electrode tab moves upward relative to the electrode tab to cut the electrode tab, and In the electrode tab attaching process, the electrode tab is attached to an upper side of the electrode.

9. A secondary battery comprising: an electrode assembly in which electrodes and separators are alternately stacked; an electrode tab to which each of the electrodes is attached; as well as a battery box, in which the electrode assembly and the electrode tab are accommodated, Wherein, burrs generated on the edges of the electrode tabs due to cutting protrude in a direction facing the battery box.

10. The secondary battery according to claim 9, wherein The corners of the electrode tabs are arranged in a curved shape having a curvature radius on a plane.

11. The secondary battery according to claim 10, wherein The corner of the electrode tab having the radius of curvature is disposed on the electrode.

12. The secondary battery according to claim 10, wherein The curvature radius of the corner of the electrode tab is greater than 1 / 2 of the width of the electrode tab.

13. The secondary battery according to claim 9, wherein The electrode assembly is wound in a state where the electrodes and the separators are sequentially stacked, and The battery case has a cylindrical shape and is configured to accommodate the electrode assembly.

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