Button-type secondary battery and its assembly device

Abstract

The present invention provides an apparatus for assembling a button secondary battery in which an electrode assembly is mounted inside a can that is closed at the bottom and open at the top, and an electrode tab extending from the electrode assembly is welded to the inner surface of a cap that is fitted to close the top of the can. The apparatus includes a can holder that fixes the can so that the top of the electrode assembly faces upward; a cap holder that grips the cap to rotate and raise and lower the cap; and a guide that is slidable toward the electrode tab so that one end presses a predetermined point on the electrode tab to form a bending point at which the electrode tab will fold when bent. When the guide forms the bending point on the electrode tab, the cap holder fits the cap to the can so that the top of the open can is closed. The present invention having the above-described configuration forms a bending point at which bending is induced in the electrode tab before the cap and can are joined, so that the cap and can can be assembled with the electrode tab evenly folded.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0124295 filed on September 24, 2020, and Korean Patent Application No. 10-2021-0125278 filed on September 17, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a button secondary battery and an assembly apparatus thereof, and more particularly to an assembly apparatus for a button secondary battery that forms a bending point at a predetermined position to induce folding of an electrode tab (positive electrode tab or negative electrode tab) so that the electrode tab can be folded as intended when a cap and a can are joined, and a button secondary battery that can be manufactured by the assembly apparatus. [Background technology]

[0003] Button batteries, also known as coin batteries or button batteries, are generally larger in diameter than they are tall and have the shape of a thin button. They are widely used in a variety of devices, such as remote controls, watches, toys, and computer parts.

[0004] Such button batteries were primarily manufactured as non-rechargeable primary batteries, but in recent years, in line with the development of miniaturized devices, they have also been widely manufactured as rechargeable secondary batteries. Like cylindrical or pouch-type secondary batteries, button-type secondary batteries are also manufactured to have a structure that allows repeated charging and discharging by incorporating an electrode assembly and an electrolyte in a case.

[0005] A button secondary battery has a structure in which a can, which is closed at the bottom and open at the top, is connected to a cap to close the open top of the can. The can has a Schale-like shape with a side wall protruding at a certain height along the periphery of the bottom, and the cap may be provided in a Schale-like shape with a diameter slightly larger than that of the can so that it can be fitted into the can (press-fitting method of can and cap), or in a disc-shaped plate shape that covers the top of the can and the edge portion can be fixed to the top of the can by welding (welding method of can and cap). In this case, even if the cap has a disc-shaped plate shape, it is necessary to connect the cap and the can at an accurate position so that the edge of the cap fits into the top of the can, not to mention when the cap has a Schale-like shape similar to the can.

[0006] The can is loaded with an electrode assembly in which a positive electrode, a separator, and a negative electrode are wound in a stacked state, and an electrolyte. The electrode assembly is wound around a rotating core in a stacked structure of a separator, a negative electrode, a separator, and a positive electrode, and when the core is removed, a center hole is formed in the center, and a center pin can be selectively inserted into the center hole.

[0007] Thus, the electrode assembly has a structure in which both sides are formed in a circular shape, with a negative electrode tab extending from the negative electrode protruding from one side and a positive electrode tab extending from the positive electrode protruding from the other side, where one of the one and the other side faces downward and the other faces upward when the electrode assembly is mounted in a can.

[0008] Therefore, one of the two electrode tabs (positive and negative tabs) is welded to the inside bottom surface of the can before the electrode assembly is mounted on the can, and the other is welded to the inside ceiling surface of the cap (the surface that views the electrode assembly when the cap is joined to the can) after the electrode assembly is mounted on the can.

[0009] In order to prevent the occurrence of a short circuit when the cap and the can are joined, a non-conductive gasket is placed at the point where the cap and the can come into contact, and the edge of the cap is bent to press the gasket when joined to the can.

[0010] However, since the point at which the electrode tab (positive or negative electrode tab) bends is not consistent when the cap and the can are joined, there is a risk that the electrode tab may pressurize or strike the electrode assembly when the cap and the can are joined. Also, if the electrode tabs break off in the wrong place or in an unintended direction, it can cause interference when attaching the cap. Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, the main object of the present invention is to provide an assembly device for a button secondary battery that can solve the above-mentioned problems by forming the bending point of the electrode tab at a specific position so that the electrode tab can be folded in an intended shape when the cap and the can are joined, and a button secondary battery that can be assembled by the assembly device. [Means for solving the problem]

[0012] In order to achieve the above-mentioned object, an apparatus for assembling a button type secondary battery according to the present invention is provided for assembling an electrode assembly mounted inside a can having a closed bottom and an open top, and an electrode tab extending from the electrode assembly being welded to an inner surface of a cap that is coupled to close the top of the can. The apparatus includes a can holder that fixes the can so that an upper surface of the electrode assembly faces upward, a cap holder that grips the cap to rotate and raise and lower the cap, and a guide that is slidable toward the electrode tab such that one end of the electrode tab applies pressure to a predetermined point on the electrode tab to form a bending point at which the electrode tab breaks when bent, and when the guide forms the bending point on the electrode tab, the cap holder couples the cap to the can so that the top of the open can is closed.

[0013] Before the guide approaches the electrode tab to form a bending point, the cap holder rotates the cap perpendicular to the sliding direction of the guide.

[0014] When the cap is rotated perpendicular to the sliding direction of the guide, the can is fixed in a perpendicular position with the cap. The cap holder is coupled to a vacuum device that generates negative pressure so that the cap holder is gripped by negative pressure at a point where the cap comes into contact with the cap.

[0015] When the cap holder attaches the cap to the can, the cap holder rotates the cap so that the lower edge of the cap abuts against the upper edge of the can, and lowers the cap so that the side of the can enters the inside of the side of the cap. The can holder is placed at the center, and the cap holder and guide are positioned opposite each other.

[0016] The cap holder includes an upper connecting plate into which a cap can be inserted and fixed via the vacuum device, a first sliding part that slides toward the can holder in the same sliding direction as the guide, a second sliding part that is connected to the first sliding part and slides to raise or lower the cap, and a rotating part that has one end connected to the upper connecting plate and the other end rotatably connected to the second sliding part, and the first sliding part, the second sliding part, and the rotating part can be operated simultaneously or individually. The can holder includes a lower connecting plate having a groove punched therein for inserting and securing the can therein.

[0017] The can holder secures two or more cans, the cap holder grips the same number of caps as the cans, and the guide simultaneously forms bending points on each electrode tab welded to the cap holder with a single sliding motion.

[0018] When the guide presses the electrode tab to form a bending point, the cap holder fixes the cap so that the opposite side to the pressed point is supported by the inner surface of the cap. The guide is controlled so that the magnitude of pressure applied varies depending on the thickness of the electrode tab.

[0019] Furthermore, the button type secondary battery according to the present invention is a button type secondary battery in which an electrode assembly is mounted inside a can having a closed bottom and an open top, and a cap is attached to close the top of the can, and the button type secondary battery includes an electrode tab having one end connected to the electrode assembly and the other end joined to an inner surface of the cap, and the electrode tab is bent between the electrode assembly and the cap, and at this time, a bending point C is formed at which the electrode tab is compressed by external pressure to induce folding, and the electrode tab is bent at the bending point C.

[0020] The bending point C is a point where the electrode tab 2 becomes relatively thinner or the material is deformed (a point where the rigidity decreases, the ductility increases, or the material is elastically deformed) due to the application of external pressure. Effect of the Invention

[0021] In the present invention having the above-mentioned configuration, a bending point that induces folding is formed in the electrode tab (one of the negative electrode tab or the positive electrode tab that is connected to the cap) before the cap and the can are joined together, so that the cap and the can can be assembled in a state in which the electrode tab is folded evenly.

[0022] A bending point is formed at the point where the electrode tab is pressed by the pressure of the guide, and in this case, the cap holder can move and rotate so that the electrode tab, whose end is welded to the cap, is placed in the appropriate position when the guide approaches, so the bending point can be accurately positioned.

[0023] The cap holder grips the cap by negative pressure, so that the cap is not deformed or left with marks due to gripping. Additionally, the can holder and cap holder are capable of holding or gripping multiple cans and caps, allowing multiple assemblies to be performed simultaneously.

[0024] Furthermore, the guide can be controlled so that the amount of pressure applied varies depending on the thickness of the electrode tab, so that bending points can be formed in electrode tabs of various thicknesses and materials. [Brief description of the drawings]

[0025] [Figure 1] 5A to 5C are diagrams sequentially showing the behavior of a cap during assembly of a button-type secondary battery according to the present invention using an assembly device. [Diagram 2] 1 is a perspective view of an assembly device for a button-type secondary battery according to an embodiment of the present invention; [Diagram 3] FIG. 3 is a partial enlarged view of part A in FIG. 2. [Figure 4a] FIG. 13 is a diagram showing the state before the guide enters the electrode tab. [Figure 4b]FIG. 13 is a diagram showing the guide entering the electrode tab. [Figure 4c] FIG. 13 is a diagram showing the state in which the guide retreats to its original position. [Figure 4d] 13 is a diagram showing the first sliding part approaching the can holder, the second sliding part ascending, and the rotating part rotating. FIG. [Figure 4e] This is a diagram showing the state before the second slide section descends. [Figure 4f] A diagram showing the second slide section completely lowered. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments set forth herein.

[0027] In order to clearly describe the present invention, parts that are not relevant to the description will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0028] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a limited manner to their ordinary or dictionary meanings, but should be interpreted in a manner that is consistent with the technical ideas of the present invention, based on the principle that the inventors can appropriately define the concepts of terms in order to best describe their invention.

[0029] The present invention relates to an assembly device for a button secondary battery, which forms a bending point C in an electrode tab 2 when joining a cap 4 and a can 3, and then joins the cap 4 and the can 3. Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

[0030] First embodiment FIG. 1 is a diagram sequentially showing the behavior of a cap during assembly using an assembly apparatus for a button-type secondary battery according to the present invention, FIG. 2 is an oblique view of an assembly apparatus for a button-type secondary battery according to an embodiment of the present invention, and FIG. 3 is a partially enlarged view of part A in FIG. 2.

[0031] Referring to the accompanying drawings, the button secondary battery assembly device provided in this embodiment includes a can holder 10, a cap holder 20, and a guide 30.

[0032] In this case, in the button-type secondary battery assembled by the assembly device provided in this embodiment, the electrode assembly 1 is mounted on the can 3 with a negative electrode tab extending from the lower surface of the electrode assembly 1 welded to the can 3, and the positive electrode tab 2 extending from the upper surface of the electrode assembly 1 is welded to a predetermined point W on the inner surface of the cap 4. The cap 4 and the can 3 are provided in the state (a) in FIG. 1 when they are placed on the cap holder 20 and the can holder 10 described later. However, the electrode assembly may be placed in the opposite manner. That is, the electrode assembly 1 is mounted on the can 3 with a positive electrode tab extending from the lower surface of the electrode assembly 1 welded to the can 3, and the negative electrode tab extending from the upper surface of the electrode assembly 1 is welded to a predetermined point W on the inner surface of the cap 4.

[0033] The can holder 10 is configured to hold the can 3 such that the top surface of the electrode assembly 1 faces upward. That is, as more clearly shown in Fig. 3, the can holder 10 includes a lower binding plate 11 having a groove 12 punched therein having an inner diameter into which the can 3 can be inserted and fixed, and a frame capable of fixing the lower binding plate 11 at a constant height. Therefore, the can holder 10 can fix the movement of the can 3 while the cap 4 is attached to the can 3 at a constant height.

[0034] The cap holder 20 is configured to grip the cap 4 so as to rotate and raise and lower the cap 4 . That is, as shown in FIGS. 2 and 3, the cap holder 20 includes an upper connecting plate 21, a first sliding portion 23, a second sliding portion 24, and a rotating portion 25.

[0035] The upper binding plate 21 is punched with a groove 22 having an inner diameter into which the cap 4 can be inserted and fixed, like the above-mentioned lower binding plate 11. In addition, the upper binding plate 21 is connected to an external vacuum device (not shown) via a hose 26 to fix the cap 4.

[0036] That is, a point where air is sucked in by a vacuum device is formed in groove 22 of upper binding plate 21, and cap 4 can be fixed by negative pressure generated at that point. Meanwhile, in Fig. 1, cap 4 is shown to have a dish shape with a closed top and an open bottom like can 3, but as described above, if can 3 and cap 4 are joined by welding rather than by press-fitting, cap 4 can have a disk-shaped plate shape. Even if cap 4 is formed in the shape of a disk-shaped plate, cap 4 can be fixed to cap holder 20 by negative pressure generated by a vacuum device.

[0037] The upper connecting plate 21 is connected to one end of a rotating part 25. The other end of the rotating part 25 is rotatably connected to the second sliding part 24. The rotating part 25 can be rotated by a predetermined angle at the connection point of the second sliding part 24 by a motor or air pressure or hydraulic pressure. At this time, the rotation direction is the direction in which the cap 4 is covered on the can 3 as shown in FIG. 1, which means that the rotation occurs on the XY plane in FIG. 2.

[0038] The second sliding part 24 is configured to move the upper connecting plate 21 and the rotating part 25 up and down. That is, it is configured to slide in the Y direction in Fig. 2. The second sliding part 24 can also be driven by a motor or air pressure or hydraulic pressure.

[0039] The second sliding section 24 is connected to the first sliding section 23 and configured to be slidable in the same direction as the sliding direction of a guide 30 described later, i.e., in the X direction in Fig. 2. The first sliding section 23 can also be driven by a motor or by air pressure or hydraulic pressure. The first sliding portion 23, the second sliding portion 24, and the rotating portion 25 can be configured to be operable simultaneously or individually.

[0040] Furthermore, the guide 30 is located on the opposite side of the cap holder 20 with the can holder 10 at the center. The guide 30 has a structure in which a blade 31 made of a metal harder than the electrode tab 2 is attached to the end of a sliding device that slides in the X direction.

[0041] Accordingly, when the blade 31 presses a specific point on the electrode tab 2 in a state where the electrode tab 2 is fixed, a bending point C can be formed at the point where the blade 31 presses.

[0042] Fig. 4a shows the state before the guide 30 enters the electrode tab 2, Fig. 4b shows the state of the guide 30 entering the electrode tab 2, Fig. 4c shows the state of the guide 30 retracting to its original position, Fig. 4d shows the state of the second slide 24 ascending and the rotating part 25 rotating while the first slide 23 approaches the can holder 10, Fig. 4e shows the state before the second slide 24 descends, and Fig. 4f shows the state after the second slide 24 has completely descended. However, in order to avoid complicating the drawings, Figs. 4a to 4f show the cap 4 and the can 3 omitted.

[0043] 1 and 4a to 4f, a secondary battery is provided with a can 3 placed on the lower binding plate 11 of the can holder 10 and a cap 4 gripped by the upper binding plate 21 of the cap holder 20. At this time, an electrode assembly 1 is placed on the can 3, and an electrode tab 2 extending from the electrode assembly 1 is either a positive electrode tab or a negative electrode tab, and is welded to a specific point W on the inner ceiling surface of the cap 4. And the other one of the positive electrode tab or the negative electrode tab is welded to the inner bottom surface of the can 3. That is, when the can holder 10 and the cap holder 20 are as shown in FIG. 4a, the secondary battery is positioned as shown in FIG. 1(a).

[0044] Then, in the state of Fig. 4a, the sliding device of the guide 30 approaches the electrode tab 2 as shown in Fig. 4b. The end of the blade 31 coupled to the sliding device presses the electrode tab 2, and the electrode tab 2 forms a bending point C at a predetermined point. Here, the bending point C refers to a point where a mark or notch is formed by pressure from the blade 31, and the electrode tab 2 becomes relatively thinner or the material is deformed (mechanical strength or ductility is deformed at a specific point), inducing a break.

[0045] After the bending point C is formed, the guide 30 returns to its original position as shown in FIG. 4c. After the guide 30 returns, the cap holder 20 lifts and rotates the cap 4, thereby moving the cap 4 onto the can 3. That is, as shown in FIG. 4d, the cap 4 rotates and rises to the form shown in FIG. 1(b) to (e) according to the operation of the first sliding part 23, the second sliding part 24 and the rotating part 25 of the cap holder 20, and is positioned on the can 3. That is, the first sliding part 23 and the second sliding part 24 slide in the X and Y directions, respectively, while the rotating part 25 rotates, so that the cap 4 can be gradually rotated to a position where it can be coupled with the can 3. More specifically, when the first sliding part 23 moves in a direction approaching the can holder 10, the second sliding part 24 rises, and the rotating part 25 rotates clockwise based on FIG. 1, the position can be changed to the state shown in FIG. 1(b) to (e).

[0046] When the cap holder 20 is in the state shown in Fig. 4e, the cap 4 is in the position shown in Fig. 1(e). At this time, when the cap 4 is rotated, the electrode tab 2 is bent at the bending point C.

[0047] Finally, when the second sliding part 24 descends as shown in Fig. 4f, the cap 4 descends together with the rotating part 25 and the upper joining plate 21, completing the joining of the cap 4 and the can 3 as shown in Fig. 1(g). At this time, if the cap 4 has a disk-shaped plate shape as described above, the edge of the cap 4 can be moved to the welding process in a state where it is fitted or placed on the upper end of the can 3.

[0048] Next, when the negative pressure is removed from the cap holder 20 and the cap 4 is separated, the button secondary battery with the cap 4 and can 3 completely combined remains in the can holder 10. The button secondary battery which has been completely assembled is removed, and the next cap 4 and can 3 to be assembled are placed back into the cap holder 20 and can holder 10.

[0049] Second embodiment In addition, in the present invention, a button secondary battery assembly apparatus capable of simultaneously assembling a plurality of button secondary batteries is provided as a second embodiment.

[0050] In this embodiment, the can holder 10 secures two or more cans 3, the cap holder 20 grips the same number of caps 4 as the cans 3, and the guide 30 can be configured to simultaneously form bending points C on each electrode tab 2 gripped by the cap holder 20 with a single sliding motion.

[0051] That is, in the structure of this embodiment, the can holder 10 includes a lower binding plate 11 having a plurality of grooves 12 having an inner diameter into which the cans 3 can be inserted and fixed, and the upper binding plate 21 is configured to have the same number of grooves 22 as the number of grooves 12 formed in the lower binding plate 11. In this case, the grooves 22 formed in the upper binding plate 21 are each connected to a vacuum device to apply negative pressure, thereby allowing each cap 4 to be individually gripped. The guide 30 can also be configured to form a plurality of bending points C at the same time by arranging a plurality of blades 31 at the end of the sliding device.

[0052] Therefore, after placing and gripping the cans 3 and caps 4 of individual button secondary batteries in the grooves 12 formed in the lower binding plate 11 and the grooves 22 formed in the upper binding plate 21, respectively, by performing the same operations of the guide 30 and the cap holder 20 as described above, multiple button secondary batteries can be assembled simultaneously with a single operation.

[0053] Meanwhile, when the guide 30 presses the electrode tab 2 to form the bending point C, the magnitude of the pressure applied by the guide 30 can be controlled to vary depending on the thickness of the electrode tab 2 so that the bending point C can be formed in electrode tabs 2 of various thicknesses and materials.

[0054] Third embodiment In the present invention, a button secondary battery that can be manufactured by the assembly apparatus of the first or second embodiment is provided as a third embodiment.

[0055] 1, the button secondary battery provided in this embodiment includes a can 3 with a closed bottom and an open top, an electrode assembly 1 mounted inside the can 3, and a cap 4 coupled to close the top of the can 3 when the electrode assembly 1 is mounted on the can 3. The electrode assembly 1 and the cap 4 have their inner ceiling surfaces connected to each other by an electrode tab 2. That is, one end of the electrode tab 2 is connected to the electrode assembly 1, and the other end is connected to the cap 4. In this case, the electrode tab 2 may be either a negative electrode tab extending from a negative electrode included in the electrode assembly 1 or a positive electrode tab extending from a positive electrode included in the electrode assembly 1.

[0056] Meanwhile, the electrode tab 2 is bent between the electrode assembly 1 and the cap 4, and at this time, the electrode tab 2 is pressed by external pressure (i.e., physically pressed against the end of a guide as described in the previous embodiment) to form a bending point C where folding is induced, and the electrode tab 2 is bent at the bending point C.

[0057] The bending point C is a point where the electrode tab 2 becomes relatively thinner or the material is deformed (a point where the rigidity decreases, the ductility increases, or the material is elastically deformed) when pressure is applied by external pressure. When the cap 4 behaves and a bending force acts on the electrode tab 2, the electrode tab 2 breaks at the bending point C where the supporting force is relatively weaker than at other points. As a result, the electrode tab 2 is bent at the bending point C, and the cap 4 is joined to the can 3 .

[0058] In the present invention having the above-mentioned configuration, before the cap 4 and the can 3 are joined, the bending point C at which the electrode tab 2 is induced to bend is formed, so that the cap 4 and the can 3 can be assembled in a state in which the electrode tab 2 is uniformly bent.

[0059] A bending point C is formed at the point where the electrode tab 2 is pressed by the guide 30, and at this time, the cap holder 20 can move and rotate when the guide 30 approaches so that the electrode tab 2, the end of which is welded to the cap 4, is placed in an appropriate position, so that the position of the bending point C can be accurately formed.

[0060] The cap holder 20 grips the cap 4 by negative pressure, so that the cap 4 is not deformed or left with marks due to gripping. Furthermore, the can holder 10 and the cap holder 20 can hold or grip a plurality of cans 3 and caps 4, allowing multiple assemblies to be performed at the same time.

[0061] Furthermore, since the guide 30 can be controlled to apply different amounts of pressure depending on the thickness of the electrode tab 2, it is possible to form bending points C in electrode tabs 2 of various thicknesses and materials.

[0062] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the equivalent scope of the claims described below by a person having ordinary knowledge in the technical field to which the present invention belongs. [Explanation of symbols]

[0063] 10: Can holder 11: Lower joint plate 20: Cap holder 21: Upper connecting plate 30: Guide

Claims

1. An apparatus for assembling a button secondary battery, comprising: an electrode assembly is mounted inside a can having a closed bottom and an open top; and an electrode tab extending from the electrode assembly is welded to an inner surface of a cap that is coupled to close an upper side of the can; and the can is assembled, a can holder for fixing a can such that an upper surface of the electrode assembly faces upward; a cap holder that grips the cap so as to rotate and raise and lower the cap; a guide slidable toward the electrode tab such that one end of the guide presses a predetermined point on the electrode tab to form a folding point at which the electrode tab folds when folded; Including, When the guide forms the bending point on the electrode tab, the cap holder couples the cap to the can so that the open top side of the can is closed.

2. 2. The button secondary battery assembly apparatus according to claim 1, wherein the cap holder rotates the cap so as to be perpendicular to a sliding direction of the guide before the guide approaches the electrode tab to form a bending point.

3. 3. The button secondary battery assembly device according to claim 2, wherein when the cap is rotated so as to be perpendicular to the sliding direction of the guide, the can is fixed in a state perpendicular to the cap.

4. The apparatus of claim 1 , wherein the cap holder is coupled to a vacuum device that generates negative pressure so that the cap holder is gripped by negative pressure at a point where the cap holder contacts the cap.

5. 3. The button-type secondary battery assembly apparatus of claim 2, wherein when the cap holder attaches the cap to the can, the cap holder rotates the cap so that the lower edge of the cap abuts against the upper edge of the can, and lowers the cap so that the side of the can enters inside the side of the cap.

6. 5. The button secondary battery assembling apparatus according to claim 4, wherein the can holder is placed at the center, and the cap holder and the guide are positioned to face each other.

7. The cap holder includes: an upper coupling plate into which the cap can be inserted and fixed via the vacuum device; a first sliding portion that slides toward the can holder in the same direction as the sliding direction of the guide; a second sliding part coupled to the first sliding part and sliding to raise or lower the cap; a rotating part having one end connected to the upper connecting plate and another end rotatably connected to the second sliding part, The button secondary battery assembling device according to claim 6 , wherein the first sliding portion, the second sliding portion, and the rotating portion are operable simultaneously or individually.

8. 7. The button secondary battery assembling apparatus according to claim 6, wherein the can holder comprises a lower joining plate having a groove punched therein for inserting and fixing the can.

9. The can holder secures two or more cans; the cap holder grips the same number of caps as the cans; The button secondary battery assembling apparatus according to claim 1 , wherein the guide simultaneously forms bending points on each of the electrode tabs welded to the cap holder by one sliding movement.

10. 2. The button secondary battery assembling apparatus of claim 1, wherein the cap holder fixes the cap so that an opposite side to the pressed point is supported by an inner surface of the cap when the guide presses the electrode tab to form a bending point.

11. 11. The button secondary battery assembly apparatus according to claim 1, wherein the guide is controlled so that the magnitude of the applied pressure varies depending on the thickness of the electrode tab.

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