KR20080013211A - Cap assembly and rechargeable battery using this same and assembly method of cap assembly - Google Patents

Abstract

A cap assembly is provided to increase the bonding force of an electrode terminal to a terminal plate, and to reduce the contact resistance between an electrode terminal and a terminal plate, thereby inhibiting an increase in the internal resistance of a battery. A cap assembly comprises: a cap plate(10) having a first terminal through hole(11); a terminal plate(60) disposed at the bottom of the cap plate and having a second terminal through hole(61); and an electrode terminal(20) passing through the first through hole and the second through hole, and including a fixing member(30) disposed on the bottom surface thereof, wherein the fixing member is deformed by external force to seal the second through hole while being linked integrally to the terminal plate.

Description

CAP ASSEMBLY AND RECHARGEABLE BATTERY USING THIS SAME AND ASSEMBLY METHOD OF CAP ASSEMBLY}

1 is a perspective view of the cap assembly according to an embodiment of the present invention.

Figure 2a is an embodiment of the electrode terminal according to an embodiment of the present invention.

Figure 2b is another embodiment of the electrode terminal according to an embodiment of the present invention.

3a and 3b is a coupling state of the cap assembly according to an embodiment of the present invention.

4 is a longitudinal cross-sectional view of a rechargeable battery according to an exemplary embodiment of the present invention.

Figure 5 is a block diagram of a cap assembly assembly method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: Cap plate 11: First terminal through

12: Electrolyte injection hole 13: Sealing means

14: safety band 20: electrode terminal

30: fixing member, caulking groove 40: gasket

41: step 50: insulation plate

60: terminal plate 61: second terminal through

70: Spinning Tool 100: Cap Assembly

200: electrode assembly 210: positive electrode plate

220: negative electrode plate 230: separator

240: positive electrode tab 250: negative electrode tab

300: Case, can

S10: Inserting the Spinning Tool

S20: Spinning Tool Spinning Pressure Step

S30: Caulking Home Expansion Stage

S40: Terminal through air sealing step

S50: electrode terminal fixing step

The present invention relates to a cap assembly and a secondary battery and a cap assembly assembly method using the same, and more particularly, to improve the coupling method of the electrode terminal and the terminal plate to increase the coupling force of the electrode terminal to the terminal plate, the electrode terminal and the terminal It relates to a cap assembly for reducing the contact resistance of the plate to suppress the increase in internal resistance of the battery, and a secondary battery and a cap assembly assembly method using the same.

Recently, with the development of information and communication technology, compact and lightweight portable electric devices such as cellular phones, notebook computers, camcorders, etc. are actively developed and produced. These portable electric devices are used as a secondary battery capable of charging and discharging so that they can operate even in a place where no separate power source is provided.

The secondary battery typically includes a nickel-cadmium (Ni-Cd) battery, a nickel-hydrogen (Ni-MH) battery, a lithium secondary battery, and the like. The lithium secondary battery has a working voltage of 3.6V and is a nickel-cadmium battery or nickel. It is growing rapidly in view of being three times higher than a hydrogen battery and having a high energy density per unit weight.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. In general, it is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte, and a battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. Moreover, although a lithium secondary battery is manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

Conventional lithium secondary batteries have a positive electrode electrode plate coated with a positive electrode active material, a negative electrode plate coated with a negative electrode active material and a separator positioned between the positive electrode plate and the negative electrode plate to prevent a short and to allow the movement of lithium ions. Is composed of a rolled-up electrode assembly, a case accommodating the electrode assembly, an electrolyte injected into the case to allow movement of lithium ions, and a cap assembly fixed to the case to seal the case. .

The cap assembly may include a cap plate fixed to the case to seal the case, a terminal plate to which the negative electrode tab extending from the negative electrode plate is fixed, an insulating plate installed between the cap plate and the terminal plate to insulate, and a cap plate and an insulating plate. And an electrode terminal connected to the terminal plate through the through hole formed in the terminal plate, and a gasket for insulating the electrode terminal.

The electrode terminal is electrically connected to the terminal plate and serves as a negative electrode terminal. The electrode terminal is inserted toward the terminal plate from the upper portion of the cap plate while being surrounded by a gasket, and the lower portion of the electrode terminal is subjected to a conventional caulking process. It is integrally fixed to the terminal plate.

On the other hand, in the conventional method of caulking an electrode terminal and fixing it to a terminal plate, a problem arises in that the internal resistance of the battery is increased by the contact resistance between the electrode terminal and the terminal plate. Increasing the internal resistance of the battery has a problem of lowering the battery life and capacity.

In addition, when caulking the electrode terminal to the terminal plate, there is a problem that the phenomenon of spreading of the terminal plate caused by the high caulking pressure.

In addition, in the conventional cap assembly, since the bonding force of the electrode terminal to the terminal plate is not excellent, the electrode terminal is easily separated from the terminal plate by an external force. Therefore, there is a problem that the functionality of the negative electrode terminal is lowered, causing a failure of the battery.

Therefore, it is required to change the coupling method of the terminal plate and the electrode terminal to reduce the contact resistance of the terminal plate and the electrode terminal, and to maximize the coupling strength.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and improves the coupling method of the electrode terminal and the terminal plate to increase the coupling force of the electrode terminal to the terminal plate, and to reduce the contact resistance of the electrode terminal and the terminal plate. An object of the present invention is to provide a cap assembly capable of preventing an increase in internal resistance of a battery and a method of assembling a secondary battery and a cap assembly using the same.

Still another object of the present invention is to provide a cap assembly for smoothly spinning electrode terminals to increase adhesion between electrode terminals and terminal plates, and a secondary battery and a cap assembly assembly method using the same.

Still another object of the present invention is to provide a cap assembly and a secondary battery and a cap assembly assembly method using the cap assembly, in which the spinning pressure is reduced to prevent the spreading of the terminal plate.

Cap assembly according to the present invention in order to achieve the above object is a cap plate formed with a first terminal through hole, the terminal plate is formed in the lower portion of the cap plate and the second terminal through hole and the first terminal through and the second terminal through hole It characterized in that it comprises an electrode terminal having a fixing member connected to the terminal plate while passing through and deformed by an external force on the bottom sealing the second terminal through-hole.

In addition, the fixing member may be formed of a caulking groove into which a spinning tool is inserted.

In addition, the caulking groove may be formed at the center of the bottom surface of the electrode terminal.

In addition, the caulking groove may be formed in a cylindrical shape.

In addition, the caulking groove may be formed in a columnar shape.

In addition, the secondary battery comprising an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator are stacked, a case accommodating the electrode assembly and the electrolyte therein, and a cap assembly sealing a top opening of the case, the cap assembly includes: The assembly includes a cap plate formed with a first terminal hole; A terminal plate provided below the cap plate and having a second terminal hole formed therein; And an electrode terminal penetrating the first terminal hole and the second terminal hole, the electrode terminal having a fixing member connected to the terminal plate while being sealed by the external force on the bottom thereof to seal the second terminal hole. have.

In this case, the fixing member may be formed of a caulking groove into which a spinning tool is inserted, and the caulking groove may be formed at the center of the bottom surface of the electrode terminal. In addition, the caulking groove may have a cylindrical shape or a prismatic shape.

In addition, the cap assembly assembling method is a spinning tool (Spinning Tool) is inserted into the caulking groove formed in the bottom surface of the electrode terminal penetrating the first terminal hole of the cap plate and the second terminal hole of the terminal plate (Spinning) Tool) Inserting step, Spinning Tool rotating pressure step to rotate the Spinning Tool inside the caulking groove to press the caulking groove peripheral portion, and the caulking groove peripheral portion is rotated by the Spinning Tool Caulking groove expansion step that is deformed by pressure and expands to the terminal plate, the terminal hole sealing step of expanding the peripheral portion of the caulking groove to seal the second terminal through hole and the terminal plate and the electrode terminal by spinning (Spinning) It may be configured to include an electrode terminal fixing step that is integrally connected.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the cap assembly according to the present invention.

A preferred embodiment of the cap assembly according to the present invention, as shown in Figure 1, 3a, 3b, the cap plate 10, the electrode terminal 20 through the cap plate 10, and the cap A gasket 40 interposed between the plate 10 and the electrode terminal 20, an insulation plate 50 disposed on the bottom surface of the cap plate 10, and a terminal plate 60 provided on the bottom surface of the insulation plate 50. ) Is configured to include.

The cap plate 10 is formed in a flat plate shape having a corresponding size and shape so as to seal an upper opening of a case (not shown), and a first terminal through-hole 11 through which the electrode terminal 20 penetrates is formed at a center thereof. It is formed and the electrolyte injection hole 12 is provided on one side.

The electrode terminal 20 is inserted toward the terminal plate 60 from the top of the cap plate 10 in a state surrounded by the gasket 40, the lower portion of the electrode terminal 20 to the terminal plate 60 by spinning. It is fixed integrally. That is, the electrode terminal 20 passes through the first terminal through hole 11 of the cap plate 10, and the lower portion of the electrode terminal 20 has a second terminal through hole (to be described later) of the terminal plate 60. 61 is electrically connected to the lower portion of the terminal plate 60 through. Accordingly, the second terminal through hole 61 is sealed by the electrical connection between the electrode terminal 20 and the terminal plate 60.

On the other hand, the gasket 40 is formed of an insulating material tube for the electrical insulation between the electrode terminal 20 and the cap plate 10, the stepped portion 41 is formed in the thickness direction on the top.

The upper portion of the electrode terminal 20 is formed to be stepped so as to correspond to the stepped portion 41 of the gasket 40, and seats on the stepped portion 41 of the gasket 40, thereby opening the first terminal through-hole 11. Seal it.

As illustrated in FIGS. 2A and 2B, the electrode terminal 20 includes a fixing member 30 that is deformed by an external force and connected to the terminal plate 60 on a bottom surface thereof. The fixing member 30 is made of a caulking groove 30 in the present embodiment. The caulking groove 30 is formed as a groove recessed inward from the center of the bottom surface of the electrode terminal 20, the shape is made of a cylindrical shape, such as a triangular or square prismatic shape.

The peripheral portion of the caulking groove 30 is deformed by the rotational pressure of the spinning tool 70 for spinning the caulking groove 30 and extends to the terminal plate 60 while the electrode terminal 20 and the terminal plate 60 are rotated. ) Are integrally connected. Therefore, the caulking effect and the spinning effect can be satisfied simultaneously using the caulking groove 30. In addition, since the spinning tool 70 spins while being inserted into the caulking groove 30, the spinning process is smooth and the adhesion between the electrode terminal 20 and the terminal plate 60 is increased.

The insulating plate 50 is installed under the cap plate 10 to prevent electrical short between the cap plate 10 and the terminal plate 60.

The terminal plate 60 is installed under the insulating plate 50 and has a second terminal through hole 61 through which the electrode terminal 20 penetrates at a position corresponding to the first terminal through hole 11. do. At this time, the electrode terminal 20 and the terminal plate 60 passing through the second terminal through hole 61 are fixed integrally by the spinning process, so that the second terminal through hole 61 is sealed. On the other hand, when spinning using the caulking groove 30 formed in the electrode terminal 20, the contact resistance of the electrode terminal 20 and the terminal plate 60 is reduced, thereby reducing the internal resistance of the battery . In addition, the spinning pressure is minimized by the caulking groove 30 to prevent spreading of the terminal plate 60.

Next, with reference to the accompanying drawings will be described in detail a preferred embodiment of a secondary battery according to the present invention.

A preferred embodiment of the secondary battery according to the present invention, as shown in Figure 4, the electrode assembly 200, the case 300, the electrode assembly 200 and the electrolyte is accommodated, and the upper end of the case 300 It consists of a cap assembly 100 for sealing the opening.

The electrode assembly 200 is formed by winding a separator 230 between the positive electrode plate 210 and the negative electrode plate 220. At least one surface of the positive electrode plate 210 and the negative electrode plate 220 is coated with a positive electrode active material or a negative electrode active material. The positive electrode tab 240 is coupled to an area of the positive electrode current collector in which the positive electrode active material layer is not formed on the positive electrode plate 210 to protrude toward the upper end of the electrode assembly 200, and the negative electrode active material layer is not formed on the negative electrode plate 220. The negative electrode tab 250 is coupled to an area of the negative electrode current collector to protrude toward the upper end of the electrode assembly 200. In the electrode assembly 200, the positive electrode tab 240 and the negative electrode tab 250 are electrically insulated from each other by a predetermined distance. The positive electrode tab 240 and the negative electrode tab 250 are generally made of nickel (Ni) metal.

The case 300 is composed of a can 300 in this embodiment. That is, it is made of a container of aluminum or aluminum alloy having a shape in which the upper portion is opened into a rectangular parallelepiped. The can 300 is manufactured by a deep drawing method, and the electrode assembly 200 is accommodated through an open top to serve as a container of the electrode assembly 200 and the electrolyte. The can 300 may itself serve as a terminal and is sealed by the cap assembly 100.

The cap assembly 100 includes a cap plate 10 for sealing an upper portion of the can 300, an electrode terminal 20 penetrating through the cap plate 10, the cap plate 10, and an electrode terminal ( 20, a gasket 40 interposed between the insulating plate 50, an insulating plate 50 disposed on the lower surface of the cap plate 10, and a terminal plate 60 provided on the lower surface of the insulating plate 50.

The cap plate 10 is formed of a metal plate having a size and a shape corresponding to the top opening of the can 300. A first terminal through hole 11 having a predetermined size is formed in the center of the cap plate 10, and an electrode terminal 20 is inserted into the first terminal through hole 11. When the electrode terminal 20 is inserted into the first terminal hole 11, a tubular gasket 40 is coupled to an outer surface of the electrode terminal 20 to insulate the electrode terminal 20 and the cap plate 10. Are inserted together. Meanwhile, an electrolyte injection hole 12 is formed at one side of the cap plate 10. After the cap assembly 100 is assembled to the upper opening of the can 300, the electrolyte is injected through the electrolyte inlet 12, and the electrolyte inlet 12 is sealed by a separate sealing means 13.

The sealing means 13 is a ball-shaped base material formed of aluminum or an aluminum-containing metal, placed on the electrolyte inlet 12 and mechanically press-fitted into the electrolyte inlet 12. In addition, the sealing means 13 is welded to the cap plate 10 around the electrolyte inlet 12 for sealing.

In addition, the cap plate 10 is formed with a safety vent 14 to allow the gas to be released when the internal pressure rises on the other side to reach a predetermined pressure or more. The safety vent 14 is damaged when the pressure inside the battery rises above a predetermined pressure, thereby preventing ignition and explosion of the battery.

The electrode terminal 20 and the terminal plate 60 have the same configuration as the electrode terminal 20 and the terminal plate 60 of the preferred embodiment of the cap assembly 100 according to the present invention described above.

That is, the electrode terminal 20 is connected to the negative electrode tab 250 of the negative electrode plate 220 to act as a negative electrode terminal, and is connected to the terminal plate 60 by being deformed by an external force before being connected to the negative electrode tab. Fixed member 30 is formed on the bottom. The fixing member 30 is made of a caulking groove 30 is fixed to the terminal plate 60 by spinning in this embodiment.

The caulking groove 30 is formed in the center of the bottom surface of the electrode terminal 20, a rotating spinning tool (70) is inserted into the caulking groove 30, the caulking groove peripheral portion is pressed by the terminal plate While extending to 60, the electrode terminal 20 and the terminal plate 60 are fixed integrally. In addition, the caulking groove 30 may be formed in a cylindrical shape, or a prismatic shape such as triangular or square.

On the other hand, the upper portion of the electrode terminal 20 is seated on the upper portion of the gasket 40 to seal the first terminal through-hole 11 of the cap plate 10. That is, the gasket 40 has a stepped portion 41 formed thereon in the thickness direction, and the upper portion of the electrode terminal 20 is formed stepped to correspond to the stepped portion 41. Therefore, the upper end of the electrode terminal 20 is seated on the step portion 41 of the gasket 40 to seal the first terminal through-hole (11).

The lower end of the terminal plate 60 and the electrode terminal 20 is electrically connected by spinning as described above, and the negative electrode tab 250 drawn from the negative electrode plate 220 is connected to the lower end of the electrode terminal 20. It is welded with a zigzag bent portion.

On the other hand, as described above, before the electrode terminal 20 and the negative electrode tab 250 is welded, the caulking groove 30 formed in the electrode terminal 20 is deformed by an external force and integrated with the terminal plate 60. Is fixed. Therefore, the welding area can be easily welded to the electrode terminal 20 and the negative electrode tab 250 because a larger welding area can be ensured during welding.

In addition, a positive electrode tab 240 drawn from the positive electrode plate 210 is welded to the lower surface of the cap plate 10. In this case, as a welding method for coupling the negative electrode tab 250 and the positive electrode tab 240, resistance welding, laser welding, or the like is used, and resistance welding is generally used.

In addition, the cap assembly 100 is coupled to the can 300 by welding the periphery of the cap plate 10 to the sidewall of the can 300 opening.

The insulating plate 50 is formed of an insulating material such as the gasket 40 and is coupled to the bottom surface of the cap plate 10. The insulating plate 50 is formed with a through hole in which the electrode terminal 20 is inserted at a position corresponding to the first terminal through hole 11 of the cap plate 10.

The terminal plate 60 is generally formed of a nickel (Ni) alloy, and is mounted on the bottom surface of the insulation plate 50. The terminal plate 60 is formed with a second terminal through-hole 61 into which the electrode terminal 20 is inserted at a position corresponding to the first terminal through-hole 11 of the cap plate 10, wherein the electrode terminal ( Since the 20 is insulated by the gasket 40 and coupled through the first terminal through hole 11 of the cap plate 10, the terminal plate 60 is electrically insulated from the cap plate 10 while the electrode terminal 20 is insulated from the cap plate 10. Is electrically connected to the

Next, with reference to the accompanying drawings will be described in detail a preferred embodiment of the cap assembly assembly method according to the present invention.

A preferred embodiment of the cap assembly assembly method according to the present invention is shown in Figure 3a, 3b, 5, i) Spinning Tool (Spinning Tool) inserting step (S10), and ii) Spinning Tool (Spinning Tool) Rotational pressure step (S20), iii) caulking groove expansion step (S30), and iv) terminal through-hole sealing step (S40) and v) electrode terminal fixing step (S50) is included.

Inserting the spinning tool (S10) is an electrode terminal 20 passing through the first terminal through-hole 11 formed in the cap plate 10 and the second terminal through-hole 61 formed in the terminal plate 60. A caulking groove 30 recessed inwardly is formed at a bottom of the caulking groove, and a spinning tool 70 for rotating and pressing into the caulking groove 30 is inserted.

The insulating plate 50 provided between the cap plate 10 and the terminal plate 60 is formed with a through hole through which the electrode terminal 20 passes.

The spinning tool (spinning tool) rotation pressing step (S20) is a step in which the spinning tool (Spinning Tool) 70 is inserted into the caulking groove 30 to press the peripheral portion of the caulking groove (30). At this time, the pressed portion of the caulking groove 30 begins to deform.

The caulking groove expansion step (S30) is a step in which a peripheral portion of the caulking groove 30 is deformed by the rotational pressure of the spinning tool 70 and is extended to the terminal plate 60. At this time, the caulking groove 30 is formed in the center portion of the bottom surface of the electrode terminal 20 is uniformly extended in the concentric direction by the external force.

The terminal through-sealing step (S40) is a step of enclosing the peripheral portion of the caulking groove 30 and the second terminal through-hole (61).

The electrode terminal fixing step S50 is a step in which the terminal plate 60 and the electrode terminal 20 are integrally connected by spinning. Therefore, the electrode terminal 20 is then welded to the negative electrode tab 250 connected to the negative electrode plate 220 to function as a negative electrode terminal.

Next will be described the operation of the cap assembly according to the present invention configured as described above and the secondary battery and cap assembly assembly method using the same.

As shown in FIG. 3A, the electrode terminal 20 is inserted through the first terminal through hole 11 formed in the cap plate 10 and the second terminal through hole 61 formed in the terminal plate 60. After the electrode terminal 20 is inserted, the upper portion of the electrode terminal 20 seals the first terminal through-hole 11 together with the gasket 40 surrounding the outer circumference, and the lower portion of the electrode terminal 20 is the second terminal. It is exposed below the through hole (61).

On the other hand, the electrode terminal 20 is formed with a caulking groove 30 recessed in the bottom surface as a fixing member 30 with the terminal plate 60. Inserting a Spinning Tool (70) into the caulking groove (30), as shown in Figure 3b, by pressing by rotation, the peripheral portion of the caulking groove 30 is deformed while the caulking groove (30) outside The electrode terminal 20 and the terminal plate 60 are integrally fixed by the spinning process and the caulking process. Therefore, the second terminal through hole 61 formed in the terminal plate 60 is sealed.

Since the caulking groove 30 is formed by the fixing member 30 with the terminal plate 60 on the bottom surface of the electrode terminal 20, the contact resistance is reduced when the electrode terminal 20 and the terminal plate 60 are fixed. Therefore, the internal resistance of the battery produced is significantly reduced. Therefore, it is possible to manufacture a secondary battery having increased capacity and use time. In addition, since the spinning tool 70 is inserted into the caulking groove 30 to rotate and pressurize the spinning tool, the spinning is smooth, and the spinning pressure is reduced to prevent spreading of the terminal plate 60. Thus, the adhesion between the electrode terminal 20 and the terminal plate 60 is improved.

The present invention is not limited to the technical spirit of the specific embodiments or drawings described above, and those skilled in the art without departing from the gist of the invention claimed in the claims Various modifications are possible, of course, and such changes are within the scope of the claims of the present invention.

As described above, the present invention improves the coupling method of the electrode terminal and the terminal plate to increase the coupling force of the electrode terminal to the terminal plate, reduce the contact resistance of the electrode terminal and the terminal plate to suppress the increase in the internal resistance of the battery. It can be effective.

Another effect of the present invention is to smoothly spin the electrode terminal to increase the adhesion to the terminal plate.

Another effect of the present invention is to reduce the spinning pressure to prevent the terminal plate from spreading.

Claims (10)

A cap plate having a first terminal hole formed therein; A terminal plate installed under the cap plate and having a second terminal hole formed therein; And The electrode terminal penetrates through the first terminal hole and the second terminal hole, and is deformed by an external force on the bottom thereof, and includes an electrode terminal having a fixing member integrally connected to the terminal plate while sealing the second terminal hole. Cap assembly. The method of claim 1, The fixing member cap assembly, characterized in that consisting of a caulking groove into which a spinning tool (Spinning Tool) is inserted. The method of claim 2, The caulking groove is a cap assembly, characterized in that formed in the center of the bottom surface of the electrode terminal. The method of claim 2 or 3, The caulking groove cap assembly, characterized in that the cylindrical shape. The method of claim 2 or 3, The caulking groove is a cap assembly, characterized in that formed in a columnar shape. An electrode assembly in which a cathode plate, an anode plate, and a separator are stacked and wound; A case accommodating the electrode assembly and the electrolyte therein; And In the secondary battery comprising a cap assembly for sealing the upper opening of the case, The cap assembly, A cap plate having a first terminal hole formed therein; A terminal plate provided below the cap plate and having a second terminal hole formed therein; And The electrode terminal penetrates through the first terminal hole and the second terminal hole and is deformed by an external force on the bottom thereof, and includes an electrode terminal having a fixing member integrally connected to the terminal plate while sealing the second terminal hole. Secondary battery made with. The method of claim 6, The fixing member is a secondary battery, characterized in that consisting of a caulking groove into which a spinning tool (Spinning Tool) is inserted. The method of claim 7, wherein The caulking groove is a secondary battery, characterized in that formed in the center of the bottom surface of the electrode terminal. The method according to claim 7 or 8, The caulking groove is a secondary battery, characterized in that formed in a cylindrical shape or a prismatic column. A Spinning Tool insertion step in which a Spinning Tool is inserted into a caulking groove formed in a bottom surface of an electrode terminal passing through the first terminal hole of the cap plate and the second terminal hole of the terminal plate; A spinning tool rotating pressing step in which a spinning tool rotates inside the caulking groove to press the caulking groove periphery; A caulking groove expansion step in which a caulking groove periphery is deformed by a rotational pressure of a spinning tool and is expanded to a terminal plate; A terminal hole sealing step of enclosing the peripheral portion of the caulking groove and sealing the second terminal hole; And Cap terminal assembly method characterized in that it comprises an electrode terminal fixing step of the terminal plate and the electrode terminal is integrally connected by spinning (Spinning).

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