KR20220020213A - Button type secondary battery and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a button-type secondary battery including: an electrode assembly; a lower can having an accommodating portion having an accommodating groove formed on an upper surface thereof for accommodating the electrode assembly, a connecting portion extending outward from the top of the receiving portion, and a bent portion extending from a front end of the connecting portion toward a lower part of the accommodating portion; an upper can having a cover portion that closes the accommodating groove while being disposed on the upper surface of the accommodating portion, and formed along an edge surface of the cover portion and having a coupling portion coupled to the bent portion; and a gasket provided between the lower can and the upper can, wherein an indented lower insertion groove and an indented upper insertion groove are formed, respectively, in the bent portion of the lower can and the coupling portion of the upper can to which the gasket is in close contact, and the lower insertion groove and the upper insertion groove are spaced apart from each other so as not to face each other. Therefore, the process is simplified, the working time is greatly shortened, and the occurrence of short circuits is prevented.

Description

Button type secondary battery and manufacturing method thereof

The present invention relates to a button-type secondary battery and a method for manufacturing the same, and more particularly, to a button-type secondary battery having increased bonding and adhesion by applying a clamping method, and a method for manufacturing the same.

In general, a secondary battery refers to a battery capable of charging and discharging unlike a primary battery that cannot be charged, and such secondary batteries are widely used in phones, notebook computers, camcorders, and electric vehicles.

On the other hand, the secondary battery includes a button-type secondary battery having high energy density, high output, and long lifespan, wherein the button-type secondary battery includes an electrode assembly, a lower can accommodating the electrode assembly, an upper can coupled to the lower can, the It includes a gasket for sealing the lower can and the upper can. In addition, the lower can and the upper can are coupled through a welding method using a laser.

However, since the conventional button-type secondary battery uses a welding method using a laser to combine the lower can and the upper can, the process for uniform sealing is complex and time-consuming. Also, a difference in bonding force between the upper can and the lower can may occur. In addition, since the electrode terminal requires a rivet coated with an insulator, there is a problem that a short circuit may occur when the insulator is damaged.

Patent Publication No. 10-2018-0036086.

The present invention was invented to solve the above problems, and the present invention can prevent a difference in bonding force between the lower can and the upper can from occurring by coupling the lower can and the upper can through a clamping method. It is an object of the present invention to provide a button-type secondary battery capable of greatly increasing the bonding force and sealing force between the can and the upper can, in particular, simplifying the process, shortening the working time, and preventing the occurrence of a short circuit and a method for manufacturing the same do it with

The button-type secondary battery of the present invention for achieving the above object is an electrode assembly; a lower can having a receiving part having an accommodating groove formed on its upper surface for accommodating the electrode assembly, a connecting part extending outwardly from the upper end of the receiving part, and a bent part extending from a tip of the connecting part in a downward direction of the receiving part; an upper can having a cover portion disposed on the upper surface of the accommodation portion to close the accommodation groove, and a coupling portion formed along an edge surface of the cover portion and coupled to the bent portion; and a gasket provided between the lower can and the upper can, wherein the bent portion of the lower can to which the gasket is in close contact and the coupling portion of the upper can have a recessed lower insertion groove and a recessed upper insertion groove, respectively. is formed, and the lower insertion groove and the upper insertion groove may be spaced apart from each other so as not to face each other.

A portion of the gasket is introduced into the lower insertion groove and the upper insertion groove by clamping the bent portion of the lower can and the coupling portion of the upper can, and a lower insertion protrusion and an upper insertion protrusion are formed on the surface of the gasket, and the lower insertion protrusion A contact area between the lower can and the gasket may be increased by the insertion protrusion, and a contact area between the upper can and the gasket may be increased by the upper insertion protrusion.

The lower insertion groove or the upper insertion groove may have a triangular shape that gradually decreases in width toward the bottom.

The lower insertion groove or the upper insertion groove may be provided in two or more, and the two or more lower insertion grooves or the upper insertion groove may be provided to be connected in a direction in which the lower can and the upper can are clamped.

The two or more lower insertion grooves or the two or more upper insertion grooves may be provided to gradually increase in size in a direction in which the lower can and the upper can are clamped.

A recess-type connection insertion groove and a recess-type cover insertion groove are formed in the connection part of the lower can to which the gasket is in close contact and the cover part of the upper can, and the connection insertion groove and the cover insertion groove are spaced apart from each other so as not to face each other. can do.

A part of the gasket is introduced into the connection insertion groove and the cover insertion groove by clamping the connection part of the lower can and the cover part of the upper can, and a connection insertion projection and a cover insertion projection are formed on the surface of the gasket, and the connection insertion projection Thus, the contact area between the lower can and the gasket may be increased, and the contact area between the upper can and the gasket may be increased by the cover insertion protrusion.

The bent portion and the tip of the coupling portion coupled to each other with the gasket interposed therebetween may be swaged and the bent portion may be in close contact with the surface of the receiving portion.

On the other hand, the button-type secondary battery manufacturing method of the present invention prepares a lower can having a receiving portion having a receiving groove on its upper surface, a connecting portion extending outwardly from the upper end of the receiving portion, and a bent portion extending downwardly from the tip of the connecting portion. , a lower can preparation step in which a recessed lower insertion groove is formed in the bent portion; Preparing an upper can in which a cover portion disposed on the upper surface of the receiving portion, an upper can formed along an edge surface of the cover portion and a coupling portion coupled to the bent portion is formed, wherein the coupling portion has a recessed upper insertion groove ; an arrangement step of accommodating the electrode assembly in the receiving groove of the lower can, and then disposing a gasket on the upper part of the lower can; and coupling the coupling part of the upper can to the bent part of the lower can to close the receiving groove of the lower can through the cover part of the upper can, wherein the lower insertion groove formed in the lower can and the upper can The upper insertion groove formed in the can may be formed to be spaced apart from each other without facing each other when the lower can and the upper can are coupled.

After the coupling step, further comprising a clamping step of simultaneously pressing the inner circumferential surface of the bent portion and the outer circumferential surface of the coupling portion positioned in the space between the receiving portion and the bent portion, wherein the clamping step includes the bent portion and the When the coupling part is clamped, a portion of the gasket is introduced into the lower insertion groove and the upper insertion groove, and a lower insertion protrusion and an upper insertion protrusion are formed on the surface of the gasket, and the lower can and the gasket are separated by the lower insertion protrusion The contact area may be increased, and the contact area between the upper can and the gasket may be increased by the upper insertion protrusion.

In the lower can preparation step, a recess-type connection insertion groove is further formed in the connection part to which the gasket is in close contact, and in the cover part to which the gasket is in close contact in the upper can preparation step, a recess-type cover insertion groove is further formed; The connection insertion groove and the cover insertion groove may be formed to be spaced apart from each other without facing each other when the lower can and the upper can are coupled.

The clamping step further includes a secondary clamping process of clamping a bottom surface of the connection part and an upper surface of the cover part, and the secondary clamping process clamps the bottom surface of the connection part and the top surface of the cover part. A connection insertion protrusion and a cover insertion protrusion may be formed on the surface of the gasket while being introduced into the insertion groove and the cover insertion groove.

After the clamping step, further comprising a swaging step of swaging the ends of the bent portion and the coupling portion coupled to each other with the gasket interposed therebetween to bring the bent portion into close contact with the surface of the receiving portion, wherein the swaging step comprises: As the coupling part is bent obliquely with respect to the edge surface of the cover part, the tip of the bent part of the lower can may be in close contact with the surface of the receiving part.

The button-type secondary battery of the present invention includes a lower can, an upper can, and a gasket, the lower can has a receiving part, a connecting part, and a bent part, and the upper can has a cover part and a coupling part. Due to such a feature, it is possible to clamp the surfaces of the lower and upper cans by directly pressing and clamping the corresponding surfaces, thereby minimizing the difference in bonding force between the lower and upper cans. It is possible to increase the bonding strength and sealing strength. In particular, the button-type secondary battery of the present invention having the structure as described above can greatly reduce the simplification of the process and the working time, and can greatly prevent the occurrence of a short circuit.

In addition, in the button-type secondary battery of the present invention, a recess-type lower insertion groove and a recess-type upper insertion groove are respectively formed in the bent portion of the lower can to which the gasket is in close contact and the coupling portion of the upper can, and the lower insertion groove and the The upper insertion groove is characterized in that it is spaced apart so as not to face each other. Due to such a feature, a lower insertion protrusion and an upper insertion protrusion are formed on the surface of the gasket while a part of the gasket is introduced into the lower insertion groove and the upper insertion groove when the lower can and the upper can are clamped, and the lower insertion protrusion is formed by the insertion protrusion. It is possible to increase the bonding force and sealing force between the can and the upper can.

That is, the button-type secondary battery of the present invention can simultaneously crimp the inner peripheral surface of the bent part and the outer peripheral surface of the coupling part located in the space between the receiving part and the bent part, and accordingly, a part of the gasket is inserted into the lower part. The lower insertion protrusion and the upper insertion protrusion can be stably formed on the surface of the gasket while being introduced into the groove and the upper insertion groove. In particular, a sufficient amount of gasket insertion can be ensured.

In addition, in the button-type secondary battery of the present invention, the lower insertion groove or the upper insertion groove is characterized in that it has a triangular shape that gradually decreases in width toward the bottom. Due to such a feature, the gasket can be stably introduced into the entire lower insertion groove and the upper insertion groove, and accordingly, a lower insertion protrusion having the same shape as the lower insertion groove and the upper insertion groove can be formed. In particular, a sufficient amount of gasket insertion can be ensured.

In addition, in the button-type secondary battery of the present invention, a recess-type connection insertion groove and a recess-type cover insertion groove are formed in the connection part of the lower can to which the gasket is in close contact and the cover part of the upper can, and the connection insertion groove and the cover insertion The grooves are characterized in that they are spaced apart so as not to face each other. Due to such a feature, it is possible to simultaneously crimp the bottom surface of the connection part and the top surface of the cover part, and accordingly, a part of the gasket is introduced into the connection insertion groove and the cover insertion groove, and the connection insertion protrusion and the cover on the surface of the gasket The insertion protrusion can be formed, and as a result, the bonding force and sealing force between the upper can and the lower can can be increased.

1 is an exploded perspective view showing a button-type secondary battery according to a first embodiment of the present invention;
2 is a cross-sectional view showing a button-type secondary battery according to a first embodiment of the present invention.
Figure 3 is an enlarged view of part A of Figure 2;
4 is a cross-sectional view illustrating a state in which swaging is applied in the button-type secondary battery according to the first embodiment of the present invention.
5 is a flowchart illustrating a method for manufacturing a button-type secondary battery according to a first embodiment of the present invention.
6 is a cross-sectional view illustrating a lower can preparation step, an upper can preparation step, and an arrangement step of the button-type secondary battery manufacturing method according to the first embodiment of the present invention.
7 is a cross-sectional view illustrating a coupling step and a clamping step of the button-type secondary battery manufacturing method according to the first embodiment of the present invention.
8 is a cross-sectional view illustrating a swaging step of a method for manufacturing a button-type secondary battery according to a first embodiment of the present invention.
9 is a cross-sectional view illustrating a button-type secondary battery according to a second embodiment of the present invention.
10 is a cross-sectional view illustrating a button-type secondary battery according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

[Button type secondary battery according to the first embodiment of the present invention]

As shown in FIGS. 1 to 4, the button-type secondary battery 100 according to the first embodiment of the present invention is a secondary battery in which the length of the diameter is greater than the height, and the electrode assembly 110 and the electrode assembly ( 110) containing a can assembly.

On the other hand, the button-type secondary battery 100 is also called a coin cell, also called a Ruben battery, an RM battery, and a mercury battery. Since such a button-type secondary battery 100 can be made small, it is widely used in hearing aids, portable lidos, wireless microphones, cameras, watches, and the like. And zinc is used for the negative electrode, mercury oxide is used for the positive electrode, and zinc oxide and potassium hydroxide are used for the electrolyte.

electrode assembly

The electrode assembly 110 has a three-layer structure in which a first electrode, a separator, and a second electrode are sequentially stacked. Meanwhile, the electrode assembly is not limited to a three-layer structure, and may have a three-layer or more structure in which the first electrode and the second electrode are alternately stacked with a separator interposed therebetween.

Here, the separator is formed to be larger than the first electrode and the second electrode, and accordingly, the separator prevents the first electrode and the second electrode from being grounded, and as a result, an accident due to a short circuit is prevented. Meanwhile, the first electrode is a cathode, and the second electrode is an anode.

The can assembly is connected to the first electrode of the electrode assembly 110 and is connected to the lower can 120 that also serves as a first electrode terminal, is connected to the second electrode of the electrode assembly 110, and is coupled to surround the lower can 120 . and a gasket ( 140).

Meanwhile, the button-type secondary battery 100 according to the first embodiment of the present invention has a structure capable of directly clamping the surfaces of the lower can 120 and the upper can 130 . Accordingly, the difference in bonding force between the lower can 120 and the upper can 130 can be minimized, and the bonding force and sealing force between the lower can 120 and the upper can 130 can be increased.

lower can

Referring to FIG. 2 , the lower can 120 includes a tubular receiving portion 121 having a receiving groove accommodating the electrode assembly 110 on its upper surface, and a connecting portion 122 extending horizontally outward from the upper end of the receiving unit. ), and a bent portion 123 extending vertically from the front end of the connecting portion 122 to the lower direction of the receiving portion 121 .

The lower can 120 having such a structure includes a accommodating part 121, a connecting part 122, and a bent part 123, and thus a space between the accommodating part 121 and the bent part 123, that is, an insertion space (a). ), and the insertion space (a) is the inner surface of the bent portion 123 facing the receiving portion (the inner surface of the bent portion facing the receiving portion of the lower can when viewed in FIG. 2) or the bottom surface of the connecting portion 122 (Fig. When viewed from 2, the bottom of the connection part) can be exposed to the outside. Accordingly, the inner surface of the bent portion 123 and the lower surface of the connecting portion 122 can be directly compressed and clamped, and as a result, the difference in bonding force between the lower can 120 and the upper can 130 can be minimized.

Meanwhile, the accommodating part 121 , the connecting part 122 and the bending part 123 are integrally formed, thereby simplifying the structure and increasing manufacturing efficiency.

Meanwhile, the thickness of the connecting part 122 and the bending part 123 may be formed to be smaller than the thickness of the receiving part 121 . That is, the receiving portion has greater strength than the connecting portion and the bent portion. Accordingly, the bent portion 123 can be effectively swaged and bent, and as a result, the tip of the bent portion 123 can be surface-adhered to the receiving portion 121 . In particular, since the receiving portion has greater strength than the bent portion, even if the bent portion is bent, it is not deformed, and thus the electrode assembly accommodated in the receiving portion can be stably protected.

upper can

The upper can 130 is disposed on the upper surface of the accommodating part 121 and is formed along the edge surface of the cover part 131 for closing the accommodating groove, and the cover part 131 , and is formed on the bent part 123 . It includes a coupling portion 132 to be coupled.

Here, the end of the coupling part 132 may protrude more than the end of the bent part 123 when viewed from the bottom surface of the receiving part, which is the end of the bending part and the coupling part 132 through swaging. When bending in the direction toward the outer circumferential surface, the end of the coupling part 132 may be positioned so as to be in close contact with the receiving part with the gasket 140 interposed therebetween.

At this time, the outer gasket 141 between the bent part 123 and the coupling part 132 may extend to be positioned between the receiving part 121 and the coupling part 132 , and accordingly, the coupling part 132 . It is possible to block the contact between the end of the accommodating part 121 and the outer peripheral surface of the accommodating part 121, and as a result, it is possible to prevent the occurrence of a short circuit (see FIG. 4).

gasket

The gasket 140 is to seal and insulate between the lower can and the upper can, and the outer gasket 141 provided between the bent part 123 and the coupling part 132 and the inner side that are in close contact with the inner circumferential surface of the receiving part 121 are provided. It includes a gasket 142 and a connection gasket 143 provided between the connection part 122 and the cover part 131 and connecting the outer gasket 141 and the inner gasket 142 .

The button-type secondary battery 100 according to the first embodiment of the present invention having such a structure includes a lower can provided with a receiving part, a connecting part, and a bending part, so that the insertion part between the receiving part 121 and the bending part 123 is inserted. A space (a) may be formed, and the inner surface of the bent portion 123 of the lower can and the outer surface of the coupling portion 132 of the upper can may be simultaneously crimped, that is, directly compressed through the insertion space (a). . Accordingly, the bent portion 123 and the coupling portion 132 can be effectively clamped, and as a result, the difference in bonding force between the lower can 120 and the upper can 130 can be minimized. In addition, the coupling force and sealing force between the lower can 120 and the upper can 130 can be increased.

That is, the technical feature of the button-type secondary battery 100 according to the first embodiment of the present invention lies in clamping by directly pressing the bending portion 123 and the coupling portion 132 corresponding to each other at the same time.

On the other hand, in the button-type secondary battery 100 according to the first embodiment of the present invention, the bent portion 123 of the lower can 120 to which the gasket 140 is closely adhered and the coupling portion 132 of the upper can 130 . ), a recessed lower insertion groove (123a) and an indented upper insertion groove (132a) are respectively formed.

That is, a recessed lower insertion groove 123a in the form of a closed curve is formed on the outer circumferential surface of the bent portion 123 to which the gasket 140 is in close contact, and a closed curved line is formed on the inner circumferential surface of the coupling portion 132 to which the gasket 140 is in close contact. The upper insertion groove 132a of the indented shape is formed.

Here, the lower insertion groove 123a and the upper insertion groove 132a are spaced apart from each other when viewed from the state in which the lower can 120 and the upper can 130 are coupled.

Accordingly, when the bent portion 123 of the lower can 120 and the coupling portion 132 of the upper can 130 are clamped, a portion of the gasket 140 is separated from the lower insertion groove 123a and the upper insertion groove. A lower insertion protrusion 141a and an upper insertion protrusion 141b are formed on the surface of the gasket 140 while being introduced (ie, being inserted) at 132a. As a result, the adhesion area between the lower can 120 and the gasket 140 is increased by the lower insertion protrusion 141a, and the adhesion and bonding force can be increased. In addition, the adhesion area between the upper can 130 and the gasket 140 is increased by the upper insertion protrusion 141b, and the adhesion and bonding force can be increased.

On the other hand, clamping refers to press-fitting or sitting two objects.

In more detail, the bent portion 123 of the lower can 120 and the coupling portion 132 of the upper can 130 are clamped to be compressed. At this time, the bent portion 123 may be directly compressed through the insertion space (a). Then, the same force is applied to the coupling portion 132 of the upper can 130 and the bent portion 123 of the lower can 120 , and accordingly, the gasket disposed between the upper can 130 and the lower can 120 . The outer gasket 141 of 140 is compressed. At this time, a portion of the outer gasket 141 is inserted into the lower insertion groove 123a to form a lower insertion protrusion 141a, and while being inserted into the upper insertion groove 132a, an upper insertion protrusion 141b is formed.

That is, a lower insertion protrusion 141a inserted into the lower insertion groove 123a and an upper insertion protrusion 141b inserted into the upper insertion groove 132a are formed on both sides of the gasket 140 .

In particular, the lower insertion groove 123a and the upper insertion groove 132a are spaced apart from each other so as not to face each other in the lower can 120 and the upper can 130 . Accordingly, the lower insertion protrusion 141a and the upper insertion protrusion 141b formed on the surface of the gasket 140 are spaced apart from each other so as not to face each other. As a result, the amount of gasket 140 inserted into the lower insertion groove 123a and the upper insertion groove 132a can be sufficiently secured, and inserted into the lower insertion groove 123a and the upper insertion groove 132a. The lower insertion protrusion 141a and the upper insertion protrusion 141b can be stably formed while the insertion amount of the gasket is sufficiently secured, and as a result, the adhesion and coupling force between the lower can 120 and the upper can 130 can be increased. can

Here, the lower insertion protrusion 141a may be provided to be adhered to the lower insertion groove 123a, and the upper insertion protrusion 141b may be provided to be adhered to the upper insertion groove 132a. For example, the lower insertion protrusion 141a may be adhered to the lower insertion groove 123a through an adhesive, and the upper insertion protrusion 141b may be adhered to the upper insertion groove 132a through the adhesive.

Meanwhile, in the button-type secondary battery 100 according to the first embodiment of the present invention, the upper insertion groove 132a is formed to be larger than the lower insertion groove 123a. That is, referring to FIG. 2 , the contact area between the upper can 130 and the gasket 140 is smaller than the contact area between the lower can 120 and the gasket 140 . Accordingly, by forming the upper insertion groove 132a larger than the lower insertion groove 123a, the contact area between the upper can 130 and the gasket 140 can be increased, and as a result, electrolyte leakage can be prevented.

On the other hand, in the button-type secondary battery 100 according to the first embodiment of the present invention, the lower insertion groove 123a or the upper insertion groove 132a has a triangular shape that gradually decreases in width toward the bottom. That is, the amount of the gasket 140 introduced gradually decreases toward the bottom of the lower insertion groove 123a or the upper insertion groove 132a. Accordingly, by forming the lower insertion groove 123a or the upper insertion groove 132a in a triangular shape, the amount of the gasket 140 is stably introduced to the bottom of the lower insertion groove 123a or the upper insertion groove 132a. can be secured, and as a result, the insertion protrusion can be stably formed.

On the other hand, the lower insertion groove or the upper insertion groove may be formed in a semicircular shape that gradually decreases in width toward the bottom.

Here, the lower insertion groove 123a or the upper insertion groove 132a may be formed in a right-angled triangle shape with a horizontal inner wall facing the lower can 120 . Accordingly, the insertion protrusions 141a and 141b formed on the gasket 140 may be formed in a right-angled triangle shape. That is, when clamping the lower can 120 and the upper can 130, a part of the gasket is caught in the horizontal inner wall of the lower insertion groove 123a or the upper insertion groove 132a while the lower insertion groove 123a or The amount of the gasket inserted into the upper insertion groove 132a can be sufficiently secured, and as a result, the lower insertion protrusion can be smoothly formed.

On the other hand, in the button-type secondary battery 100 according to the first embodiment of the present invention, the bent part and the tip of the coupling part coupled to each other with the gasket 140 therebetween are swaged, and the bent part 123 is the It may be surface-adhesive to the surface of the receiving part 121 .

In this case, the outer gasket 141 between the bent part 123 and the coupling part 132 is provided to extend to be positioned between the receiving part 121 and the coupling part 132 , and thus the coupling part 132 is provided. It is possible to prevent the end of the and the outer peripheral surface of the receiving portion 121 from contacting, and as a result, it is possible to prevent the occurrence of a short circuit. In addition, it is possible to close the insertion space (a) formed between the receiving portion 121 and the bent portion 123, thereby preventing foreign substances from entering the insertion space (a).

Therefore, in the button-type secondary battery 100 according to the first embodiment of the present invention, the difference in bonding force between the lower can and the upper can can be minimized by directly compressing the lower can and the upper can, and as a result, the bonding force between the lower can and the upper can. and sealing power can be increased.

Hereinafter, a method for manufacturing a button-type secondary battery according to a first embodiment of the present invention will be described.

[Method for manufacturing button-type secondary battery according to the first embodiment of the present invention]

As shown in FIGS. 5 to 8, the method for manufacturing a button-type secondary battery according to the first embodiment of the present invention includes a lower can preparation step (S10), an upper can preparation step (S20), an arrangement step (S30), and a combination. It includes a step (S40), a clamping step (S50), and a swaging step (S60).

Lower can preparation stage

In the lower can preparation step S10 , referring to FIG. 6 , a lower can 120 having a receiving part 121 , a connecting part 122 , and a bending part 123 is prepared.

That is, the lower can 120 includes a cylindrical receiving portion 121 in which a receiving groove for accommodating the electrode assembly 110 is formed, a connecting portion 122 extending horizontally outward from the upper end of the receiving portion, and the connecting portion A bent portion 123 extending vertically from the tip of the 122 to the lower direction of the receiving portion 121 is included. And a recessed lower insertion groove (123a) is formed on the outer peripheral surface of the bent portion (123).

At this time, an insertion space (a) is formed between the receiving part 121 and the bending part 123, and the insertion space (a) exposes the inner peripheral surface of the bending part 123 and the bottom surface of the connecting part 122 to the outside.

Upper can preparation stage

In the upper can preparation step ( S20 ), referring to FIG. 6 , an upper can 130 having a cover part 131 and a coupling part 132 is prepared.

That is, the upper can 130 is disposed on the upper surface of the accommodating part 121 and is formed along the edge surface of the cover part 131 for closing the accommodating groove, and the cover part 131 , and the bent part ( It includes a coupling portion 132 coupled to 123). And a recessed upper insertion groove (132a) is formed on the inner peripheral surface of the coupling portion (132).

Here, the lower insertion groove 123a and the upper insertion groove 132a are spaced apart so as not to be located on the same horizontal line when the coupling of the lower can and the upper can is completed.

In particular, the lower insertion groove 123a and the upper insertion groove 132a are formed in a triangular shape, and accordingly, when clamping the lower can 120 and the upper can 130 , the lower can 120 and the upper can 130 . A portion of the gasket 140 disposed therebetween may be induced to smoothly flow into the bottom of the lower insertion groove 123a and the upper insertion groove 132a.

deployment phase

In the disposing step (S30), referring to FIG. 6 , the electrode assembly 110 is accommodated in the receiving part 121 of the lower can 120 , and then the gasket 140 is disposed on the upper part of the lower can 120 . do.

Here, the gasket 140 includes an outer gasket 141 disposed between the bent part 123 and the coupling part 132 , an inner gasket 142 disposed in close contact with the inner circumferential surface of the receiving part 121 , and a connection part 122 . and a connecting gasket 143 disposed between the cover part 131 and connecting the outer gasket 141 and the inner gasket 142 .

That is, as for the gasket 140, the outer gasket 141 is supported on the outer peripheral surface of the lower can 120, the inner gasket 142 is supported on the inner peripheral surface of the lower can 120, and the connection gasket 143 is supported on the lower can ( 120) is supported on the top surface.

bonding step

In the coupling step (S40), referring to FIG. 7 , the upper can 130 is disposed on the upper part of the lower can 120 on which the gasket 140 is disposed, and then the coupling part 132 of the upper can 130 is disposed. ) to the bent part 123 of the lower can 120 . Then, the receiving groove of the lower can 120 can be closed through the cover part 131 of the upper can 130 .

That is, the lower can 120 and the upper can 130 are compressed in a mutually coupled direction. Then, as the coupling part 132 of the upper can 130 is coupled to the bent part 123 of the lower can 120 , the coupling force may be increased. In addition, the gasket 140 is disposed between the bent portion 123 and the coupling portion 132 to increase adhesion and sealing force.

Clamping step

In the clamping step (S50), referring to FIG. 7 , after the coupling step (S40), the bent part 123 located in the space between the receiving part 121 and the bent part 123, that is, the insertion space (a). ) and the outer surface of the coupling part 132 are simultaneously pressed and clamped.

That is, the lower can 120 and the upper can 130 can be compressed with the same force. Accordingly, the difference in bonding force between the lower can 120 and the upper can 130 can be minimized, and the bonding force and sealing force between the lower can 120 and the upper can 130 can be increased.

In particular, since the accommodating part 121 is not compressed, it is possible to prevent deformation of the accommodating part, and as a result, it is possible to increase the safety of the electrode assembly 110 accommodated in the accommodating part.

In addition, when the bent portion 123 and the coupling portion 132 are compressed in the clamping step (S50), a portion of the gasket 140 is introduced into the lower insertion groove 123a and the upper insertion groove 132a. Accordingly, a lower insertion protrusion 141a and an upper insertion protrusion 141b are formed on the surface of the gasket 140, and as a result, the coupling force and sealing force between the lower can 120 and the upper can 130 are reduced. can be raised

That is, the adhesion area between the lower can 120 and the gasket 140 is increased by the lower insertion protrusion 141a, and the adhesion and bonding force can be increased. In addition, the adhesion area between the upper can 130 and the gasket 140 is increased by the upper insertion protrusion 141b, and the adhesion and bonding force can be increased.

Swaging step

In the swaging step (S60), referring to FIG. 8 , after the clamping step (S50), the coupling part 132 of the upper can 130 is swaged in the direction of the receiving part 121 of the lower can 120 . (swaging) That is, the bent portion and the tip of the coupling portion coupled to each other with the gasket interposed therebetween are swaged to bring the bent portion into close contact with the surface of the receiving portion.

Then, as the coupling part is inclinedly bent with respect to the edge surface of the cover part, the tip of the bent part of the lower can is in close contact with the surface of the accommodating part.

Therefore, when the above steps are completed, the finished button-type secondary battery 100 can be manufactured.

Hereinafter, in describing another embodiment of the present invention, the same reference numerals are used for components having the same functions as those of the above-described embodiment, and overlapping descriptions will be omitted.

[Button type secondary battery according to the second embodiment of the present invention]

As shown in FIG. 9 , the button-type secondary battery 100 according to the second embodiment of the present invention includes an electrode assembly 110 , a lower can 120 , an upper can 130 , and a gasket 140 . .

Here, the connecting portion 122 of the lower can 120 to which the gasket 140 is in close contact and the cover portion 131 of the upper can 130 have a recessed connection insertion groove 122a and a recessed cover insertion groove 131a. ) is formed.

That is, a connection insertion groove 122a is formed on the upper surface of the connection part 122 to which the gasket 140 is in close contact (ie, the upper surface of the connection part as seen in FIG. 8 ), and the cover part to which the gasket 140 is in close contact. A cover insertion groove 131a is formed on the bottom surface of the 131 (ie, the bottom surface of the connection part as seen in FIG. 8 ).

In particular, the connection insertion groove 122a and the cover insertion groove 131a are spaced apart from each other so as not to face each other when the lower can and the upper can are combined.

The button-type secondary battery 100 according to the second embodiment of the present invention having such a configuration is located in the space between the receiving part 121 and the bending part 123 of the lower can 120, that is, the insertion space (a). The lower surface of the connection part 122 and the upper surface of the cover part 131 may be directly compressed, that is, simultaneously crimped, thereby minimizing the difference in bonding force between the lower can and the upper can.

In particular, in the button-type secondary battery 100 according to the second embodiment of the present invention, a part of the gasket 140 is introduced into the connection insertion groove 122a and the cover insertion groove 131a, and is connected to the surface of the gasket 140 . The insertion protrusion 143a and the cover insertion protrusion 143b are formed, and as a result, the coupling force and sealing force between the lower can and the upper can can be greatly increased.

By the connecting insertion protrusion, the bonding force and sealing force between the lower can and the gasket can be increased while the contact area is increased. can be raised

The button-type secondary battery manufacturing method according to the second embodiment of the present invention includes a lower can preparation step (S10), an upper can preparation step (S20), an arrangement step (S30), a coupling step (S40), a clamping step (S50), and It includes a swaging step (S60).

On the other hand, the lower can preparation step (S10), the upper can preparation step (S20), the arrangement step (S30), the combining step (S40), the clamping step (S50), and the swaging step (S60) are the above-described first embodiment Since it is the same as the method for manufacturing a button-type secondary battery according to , a detailed description thereof will be omitted.

Here, in the button-type secondary battery manufacturing method according to the second embodiment of the present invention, in the lower can preparation step, a recessed connection insertion groove 122a is further formed in the connection part 122 to which the gasket is in close contact, and the upper can is prepared. In the step, a recessed cover insertion groove 131a is further formed in the cover part 131 to which the gasket 140 is in close contact.

In this case, the connection insertion groove 122a and the cover insertion groove 131a are formed to be spaced apart from each other without facing each other when the lower can and the upper can are combined.

In addition, the method for manufacturing a button-type secondary battery according to the second embodiment of the present invention further includes a secondary clamping process of clamping the bottom surface of the connection part 122 and the top surface of the cover part 131 in the clamping step. In the second clamping process, when the bottom surface of the connection part 122 and the top surface of the cover part 131 are clamped, a part of the gasket 140 is introduced into the connection insertion groove 122a and the cover insertion groove 131a. A connection insertion protrusion 143a and a cover insertion protrusion 143b are formed on the surface of the gasket. Accordingly, the coupling force and sealing force between the lower can and the upper can can be increased.

[Button type secondary battery according to the third embodiment of the present invention]

As shown in FIG. 10, the button-type secondary battery 100 according to the third embodiment of the present invention has a lower can 120 having the lower insertion groove 123a formed on the outer circumferential surface, and the upper insertion groove 132a on the inner circumferential surface. ) includes an upper can 130 formed thereon.

Here, the lower insertion groove (123a) or the upper insertion groove (132a) is provided in two or more, the two or more of the lower insertion groove (123a) or the upper insertion groove (132a) is the lower can 120 and The upper can 130 has a structure to be connected in a clamping direction (up and down direction when viewed in FIG. 10 ).

Accordingly, in the button-type secondary battery 100 according to the second embodiment of the present invention, when the lower can 120 and the upper can 130 are clamped, a portion of the gasket 140 has two or more lower insertion grooves 123a or the Two or more lower insertion protrusions 141a and two or more upper insertion protrusions 141b are formed while being introduced into the upper insertion groove 132a, and as a result, the coupling force and sealing force between the lower can 120 and the upper can 130 can be greatly increased.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts are possible.

100: button type secondary battery
110: electrode assembly
120: lower can
121: receptacle
122: connection part
122a: connection insertion groove
123: bend
123a: lower insertion groove
130: upper can
131: cover part
131a: cover insertion groove
132: coupling part
132a: upper insertion groove
140: gasket
141: outer gasket
141a: lower insertion protrusion
141b: upper insertion protrusion
142: inner gasket
143: connecting gasket
143a: connection insertion protrusion
143b: cover insertion projection

Claims (13)

electrode assembly;
a lower can having a receiving part having an accommodating groove formed on an upper surface thereof for accommodating the electrode assembly, a connecting part extending outwardly from the upper end of the receiving part, and a bent part extending from a tip of the connecting part in a downward direction of the receiving part;
an upper can having a cover portion disposed on the upper surface of the accommodation portion to close the accommodation groove, and a coupling portion formed along an edge surface of the cover portion and coupled to the bent portion; and
It includes a gasket provided between the lower can and the upper can,
A recess-type lower insertion groove and a recess-type upper insertion groove are respectively formed in the coupling portion between the bent portion of the lower can to which the gasket is attached and the upper can,
The lower insertion groove and the upper insertion groove are positioned to be spaced apart from each other so as not to face each other. The method according to claim 1,
A portion of the gasket is introduced into the lower insertion groove and the upper insertion groove by clamping the bent portion of the lower can and the coupling portion of the upper can, and a lower insertion protrusion and an upper insertion protrusion are formed on the surface of the gasket,
The contact area between the lower can and the gasket is increased by the lower insertion protrusion,
A button-type secondary battery in which a contact area between the upper can and the gasket is increased by the upper insertion protrusion. The method according to claim 1,
The lower insertion groove or the upper insertion groove is a button type secondary battery having a triangular shape that gradually decreases in width toward the bottom. The method according to claim 1,
The lower insertion groove or the upper insertion groove is provided in two or more,
At least two of the lower insertion grooves or the upper insertion grooves are provided to be connected in a direction in which the lower can and the upper can are clamped. 5. The method of claim 4,
The two or more lower insertion grooves or the two or more upper insertion grooves are provided to gradually increase in size in a direction in which the lower can and the upper can are clamped. The method according to claim 1,
A recess-type connection insertion groove and a recess-type cover insertion groove are formed in the connection part of the lower can to which the gasket is closely attached and the cover part of the upper can,
The connection insertion groove and the cover insertion groove are positioned to be spaced apart from each other so as not to face each other. 7. The method of claim 6,
A connection insertion protrusion and a cover insertion protrusion are formed on the surface of the gasket while a portion of the gasket is introduced into the connection insertion groove and the cover insertion groove by clamping the connection part of the lower can and the cover part of the upper can,
The contact area between the lower can and the gasket is increased by the connection insertion protrusion,
A button-type secondary battery in which a contact area between the upper can and the gasket is increased by the cover insertion protrusion. The method according to claim 1,
A button type secondary battery in which the bent portion and the tip of the coupling portion coupled to each other with the gasket interposed therebetween are swaged and the bent portion is in close contact with the surface of the receiving portion. A lower can having a receiving portion having a receiving groove formed on the upper surface, a connecting portion extending outwardly from the upper end of the receiving portion, and a bent portion extending downwardly from the tip of the connecting portion are prepared, wherein the bent portion has a recessed lower insertion groove A lower can preparation step to be formed;
Preparing an upper can in which a cover portion disposed on the upper surface of the receiving portion, an upper can formed along an edge surface of the cover portion and a coupling portion coupled to the bent portion is formed, wherein the coupling portion has a recessed upper insertion groove ;
an arrangement step of accommodating the electrode assembly in the receiving groove of the lower can, and then disposing a gasket on the upper part of the lower can; and
a coupling step of coupling the coupling part of the upper can to the bent part of the lower can to close the receiving groove of the lower can through the cover part of the upper can;
The method for manufacturing a button type secondary battery is formed such that the lower insertion groove formed in the lower can and the upper insertion groove formed in the upper can are spaced apart from each other without facing each other when the lower can and the upper can are combined. 10. The method of claim 9,
After the coupling step, the method further comprises a clamping step of simultaneously pressing the inner circumferential surface of the bent portion and the outer circumferential surface of the coupling portion located in the space between the receiving portion and the bent portion,
In the clamping step, when the bent portion and the coupling portion are clamped, a portion of the gasket is introduced into the lower insertion groove and the upper insertion groove to form a lower insertion protrusion and an upper insertion protrusion on the surface of the gasket,
The contact area between the lower can and the gasket is increased by the lower insertion protrusion,
A method of manufacturing a button-type secondary battery in which a contact area between the upper can and the gasket is increased by the upper insertion protrusion. 11. The method of claim 10,
In the lower can preparation step, a recess-type connection insertion groove is further formed in the connection part to which the gasket is in close contact,
In the upper can preparation step, a recessed cover insertion groove is further formed in the cover part to which the gasket is in close contact,
The method for manufacturing a button type secondary battery in which the connection insertion groove and the cover insertion groove are formed to be spaced apart from each other without facing each other when the lower can and the upper can are coupled. 12. The method of claim 11,
The clamping step further includes a secondary clamping process of clamping the lower surface of the connection part and the upper surface of the cover part,
In the secondary clamping process, when the bottom surface of the connection part and the top surface of the cover part are clamped, a part of the gasket is introduced into the connection insertion groove and the cover insertion groove, and a connection insertion projection and a cover insertion projection are formed on the surface of the gasket. Battery manufacturing method. 11. The method of claim 10,
After the clamping step, further comprising a swaging step of swaging the ends of the bent portion and the coupling portion coupled to each other with the gasket interposed therebetween to bring the bent portion into close contact with the surface of the accommodating portion,
In the swaging step, a button-type secondary battery manufacturing method in which the tip of the bent part of the lower can is in close contact with the surface of the receiving part while the coupling part is bent obliquely based on the edge surface of the cover part.

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