WO2018043879A1

WO2018043879A1 - Secondary battery

Info

Publication number: WO2018043879A1
Application number: PCT/KR2017/006368
Authority: WO
Inventors: 이현수; 변상원
Original assignee: 삼성에스디아이(주)
Priority date: 2016-09-05
Filing date: 2017-06-19
Publication date: 2018-03-08
Also published as: KR20180026910A

Abstract

The present invention relates to a secondary battery capable of enhancing safety by being provided with an insulation clip to fix a plurality of current collection tabs. For example, disclosed in the present invention is the secondary battery comprising: an electrode assembly having the plurality of current collection tabs; a case for accommodating the electrode assembly; a cap plate for sealing the case from above the case; and the insulation clip for fixing the plurality of collection tabs.

Description

Secondary battery

The present invention relates to a secondary battery.

Secondary batteries, unlike primary batteries that cannot be charged, are batteries that can be charged and discharged. In the case of low-capacity batteries in which one battery cell is packed in a pack form, secondary batteries are used in portable electronic devices such as mobile phones and camcorders. Large capacity batteries in the unit of dozens of battery packs are widely used as power sources for driving motors of hybrid vehicles.

Such secondary batteries are manufactured in various shapes, and typical shapes include cylindrical and rectangular shapes. The secondary battery is configured by installing an electrode assembly and an electrolyte formed between a positive electrode having a plurality of current collector tabs and a negative electrode plate through a separator, which is an insulator, in a case, and installing a cap assembly on an upper portion of the case. At this time, the electrode assembly located inside the case is pressed in the process of installing the cap assembly to the case. Accordingly, there is a risk that a plurality of current collector tabs may be inserted into the electrode assembly to generate a short.

The present invention provides a secondary battery having an insulation clip for fixing a plurality of current collector tabs, which can improve safety.

A secondary battery according to the present invention includes an electrode assembly having a plurality of current collector tabs; A case accommodating the electrode assembly; A cap plate sealing the case on top of the case; And an insulating clip fixing the plurality of current collecting tabs at both ends of the plurality of current collecting tabs.

In addition, the insulating clip is a hinge formed between the first clip portion, the second clip portion coupled to the first clip portion and the first clip portion and the second clip portion and thinner than the thickness of the first and second clip portions. It may include wealth.

In addition, the insulating clip may be bent around the hinge portion, and the first clip portion and the second clip portion may be coupled to each other.

Here, the plurality of current collecting tabs may be located between the first clip portion and the second clip portion.

The first clip unit may include a first center groove formed in a longitudinal direction at a center thereof; First auxiliary protrusions formed at both sides of the first center groove and formed in a direction parallel to the first center groove; And first auxiliary holes formed at both sides of the first auxiliary protrusion and formed in a direction perpendicular to the first central groove.

In addition, the second clip portion is formed in the longitudinal direction in the center, the second center projection coupled to the first center hole; Second auxiliary holes formed at both sides of the second central protrusion and coupled to the first auxiliary protrusion; And second auxiliary protrusions formed at both sides of the second auxiliary hole and coupled to the first auxiliary hole.

In addition, an insulating plate positioned between the electrode assembly and the cap plate, an electrode terminal penetrating the cap plate and electrically connected to the electrode assembly, and positioned above the insulating plate, the electrode terminal and the plurality of electrode plates. It may further include a lead tab for electrically connecting the current collector tab.

In addition, the insulating plate is located at both sides of the central region and the central region, the coupling region to which the plurality of current collector tabs are coupled; And a terminal area positioned at both sides of the coupling area and in which the electrode terminal is located, and the lead tab may be coupled to the coupling area and the terminal area.

The coupling region may have a narrower width than the central region and the terminal region, and may include an inclined surface extending inclined toward the case, and the insulating clip may contact the inclined surface.

In addition, the coupling area may protrude upward and support parts to which the lead tabs are coupled, and the plurality of current collector tabs may be located between the lead tabs and the coupling area.

The secondary battery according to the exemplary embodiment includes an insulating clip for fixing a plurality of current collector tabs, thereby preventing the current collector tabs from being inserted into the electrode assembly and shorted even when the electrode assembly is pressed. Accordingly, the safety of the secondary battery according to the present invention can be improved.

1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

2 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along the line AA ′ of FIG. 1.

4 is a cross-sectional view taken along line BB ′ of FIG. 1.

FIG. 5 is an enlarged view of a portion C shown in FIG. 2.

6 is a perspective view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention.

7 is a plan view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention.

8 is a cross-sectional view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention. 2 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention. 3 is a cross-sectional view taken along the line AA ′ of FIG. 1. 4 is a cross-sectional view taken along line BB ′ of FIG. 1. FIG. 5 is an enlarged view of a portion C shown in FIG. 2. 6 is a perspective view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention. 7 is a plan view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention. 8 is a cross-sectional view illustrating a clip of a rechargeable battery according to an exemplary embodiment of the present invention.

1 to 4, a secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 110,

electrode terminals

120 and 130, a case 140, a cap assembly 150, and an insulating plate. 160, a lead tab 170, and an insulation clip 180.

The electrode assembly 110 is formed by winding or overlapping a stack of a first electrode plate, a separator, and a second electrode plate formed in a thin plate shape or a film shape. Here, the first electrode plate may operate as a cathode, and the second electrode plate may operate as an anode. Of course, the first electrode plate and the second electrode plate may be arranged to be different in polarity from each other according to the choice of those skilled in the art.

The first electrode plate is formed by applying a first electrode active material such as graphite or carbon to a first electrode current collector formed of a metal foil such as copper or nickel, and the first electrode uncoated portion, which is a region where the first active material is not coated. Include. The first electrode uncoated portion provides a passage of current flow between the first electrode plate and the outside. In addition, the range of this invention is not limited as a material of a said 1st electrode plate.

In addition, the uncoated portion of the first electrode plate may form the first current collector tab 111. The first current collecting tab 111 is provided in plurality and protrudes from the first electrode uncoated portion. The first current collector tab 111 is formed to overlap at a predetermined position when the first electrode plate is wound to form a multi-tap structure. To this end, the first electrode plate may be wound in a state in which the plurality of first current collecting tabs 111 are spaced apart from each other by a predetermined distance. The first current collector tab 111 has a structure formed integrally with the first electrode plate, and is withdrawn from each of the wound first electrode plates, thereby increasing the current collection efficiency from the electrode assembly 110. . However, the first current collector tab 111 may be formed through a member separate from the first electrode plate according to the choice of a person skilled in the art.

The second electrode plate is formed by applying a second electrode active material such as transition metal oxide to a second electrode current collector formed of a metal foil such as aluminum, and includes a second electrode non-coating portion that is a region where the second active material is not coated. .

In addition, the second current collector tab 112 may be formed to correspond to the first current collector tab 111 from the uncoated portion of the second electrode plate. The second current collector tab 112 may also be formed by winding the second electrode plate in a state in which a plurality of second current collector tabs 112 are spaced apart from the second electrode plate. Accordingly, the second current collecting tab 112 also has a multi-tap structure similarly to the first current collecting tab 111.

The first current collector tab 111 and / or the second current collector tab 112 of the multi-tap structure may be gathered in one place by the clip member 180. The clip member 180 will be described in more detail below. In addition, the first and second

current collecting tabs

111 and 112 are respectively coupled to the clip member 180 and electrically connected to the lead tabs 170. Although FIG. 2 illustrates that the first and second current collecting

tabs

111 and 112 are vertically extended for the purpose of illustration, the first and second

current collecting tabs

111 and 112 may be the lead tabs. After welding to 170, the insulating plate 160 is inserted into the lower portion and the first and second

current collector tabs

111 and 112 are bent to complete the structure as shown in FIGS. 3 and 4.

The separator is positioned between the first electrode plate and the second electrode plate to prevent shorting and to allow movement of lithium ions. The separator may be made of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene. In addition, the range of this invention is not limited as a material of the said separator.

In addition, the electrode assembly 110 is accommodated in the case 140 substantially together with the electrolyte. In this case, at least one electrode assembly 110 may be accommodated in the case 140. The electrolyte may be made of lithium salts such as LiPF 6 and LiBF 4 in organic solvents such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC). In addition, the electrolyte may be liquid, solid or gel.

The

electrode terminals

120 and 130 are electrically connected to the first current collecting tab 111 and the second current collecting tab 112 of the electrode assembly 110, respectively. The

electrode terminals

120 and 130 include a first electrode terminal 120 electrically connected to the first current collecting tab 111 and a second electrode terminal 130 electrically connected to the second current collecting tab 112. do. Here, the first current collecting tab 111 and the second current collecting tab 112 are electrically connected to the lead tab 170, respectively. Accordingly, the first and

second electrode terminals

120 and 130 may be coupled to the lead tabs 170 and electrically connected to the first and second

current collector tabs

111 and 112, respectively. In addition, the coupling method of the first and second

current collector tabs

111 and 112 and the lead tab 170 may use ultrasonic welding, resistance welding, or laser welding, but the present invention is not limited thereto.

The first electrode terminal 120 includes a body portion 121 and a terminal portion 122 protruding from the body portion 121 in a vertical direction. The terminal portion 122 penetrates the cap plate 151 of the cap assembly 150, and an upper portion thereof is riveted to be fixed to the cap plate 151. The body portion 121 is formed under the terminal portion 122 and has an area larger than that of the terminal portion 122. In addition, a coupling protrusion 123 for coupling with the lead tab 170 is formed on the bottom surface of the body 121. The coupling protrusion 123 is coupled to the second through hole 174 of the lead tab 170 to electrically connect the first electrode terminal 120 and the lead tab 170. In addition, the second electrode terminal 130 also includes a body portion 131, a terminal portion 132, and a coupling protrusion 133 to correspond to the first electrode terminal 120.

The case 140 is formed of a conductive metal such as aluminum, an aluminum alloy, or nickel plated steel, and has a substantially hexahedral shape having an opening through which the electrode assembly 110 can be inserted and seated. A cap plate 151 is coupled to an opening of the case 140 to seal the case 140. The inner surface of the case 140 is basically insulated, thereby preventing the occurrence of an electrical short inside. In some cases, one electrode of the electrode assembly 110 may be electrically connected to the case 140 through the cap plate 151. For example, the case 140 may act as a positive electrode.

The cap assembly 150 is coupled to the upper portion (opening) of the case 140. In detail, the cap assembly 150 includes a cap plate 151, an electrolyte injection hole 152, a stopper 153, a safety vent 154, a gasket 155, a terminal plate 156, a connection member 157, An insulating member 158 and a shorting member 159.

The cap plate 151 is formed in a plate shape to seal the opening of the case 140, and may be formed of the same material as the case 140. The cap plate 151 may be coupled to the case 140 by laser welding. In addition, the cap plate 130 may be electrically independent, or in some cases, may be electrically connected to either the first current collector tab 111 or the second current collector tab 112. For example, the cap plate 151 may be electrically connected to the second current collecting tab 112, and the cap plate 151 and the case 140 have the same polarity (anode). Of course, the cap plate 151 may be electrically connected to the first current collecting tab 111.

In addition, an electrolyte injection hole 152 for injecting an electrolyte is formed at one side of the cap plate 151. The electrolyte is injected into the case 140 through the electrolyte injection hole 152, after which the electrolyte injection hole 152 is sealed by a stopper 153.

In addition, a safety vent 154 is formed at a substantially center of the cap plate 151 in a relatively thin thickness compared to other areas. When the pressure inside the case 140 is higher than the preset pressure, the safety vent 154 is opened earlier than other regions to prevent the secondary battery 100 from exploding.

In addition, terminal holes 151a for penetrating the first and

second electrode terminals

120 and 130 are formed at both sides of the cap plate 151, and gaskets 155 are formed in the terminal holes 151a, respectively. . The gasket 155 is made of an insulating material, and is coupled to the lower portion of the cap plate 151 to seal between each of the first and

second electrode terminals

120 and 130 and the cap plate 151. The gasket 155 prevents external moisture from penetrating into the secondary battery 100 or prevents the electrolyte solution contained in the secondary battery 100 from flowing out.

The terminal plate 156 is coupled to the first and

second electrode terminals

120 and 130 protruding upward of the cap plate 151 through the terminal hole 151a of the cap plate 151, respectively. In addition, after the terminal plate 156 is coupled to the first and

second electrode terminals

120 and 130, the upper portions of the first and

second electrode terminals

120 and 130 are riveted or welded, respectively, First and

second electrode terminals

120 and 130 may be fixed to the terminal plate 156.

The connection member 157 is positioned between the cap plate and the terminal plate 156 coupled to the second electrode terminal 130 to electrically connect the second electrode terminal 130 and the cap plate 151. The connection member 157 is in close contact with the cap plate 151 and the gasket 155 through the terminal plate 156.

The insulating member 158 is positioned between the cap plate 151 and the terminal plate 156 coupled to the first electrode terminal 120 to insulate the first electrode terminal 120 and the cap plate 151. . The insulating member 158 is in close contact with the cap plate 151 and the gasket 155 through the terminal plate 156.

The short circuit member 159 is formed in the short circuit hole 151 b formed at one side of the cap plate 151. The short circuit hole 151b is formed near the terminal hole 151a to which the first electrode terminal 120 is coupled. The shorting member 159 is positioned between the insulating member 158 and the cap plate 151 in the shorting hole 151b. In this case, a hole corresponding to the short circuit hole 151b is also formed in the insulating member 158. The shorting member 159 is formed of a reverse plate including a rounded convex portion and a rim portion fixed to the cap plate 151. The short circuit member 159 has the same polarity as the cap plate 151. The shorting member 159 is inverted (protruded upwardly) when the pressure inside the case 140 is higher than a predetermined pressure, thereby contacting the terminal plate 156 coupled with the first electrode terminal 120. Causes short circuit. Here, a protrusion may be formed below the terminal plate 156 so that the shorting member 159 may be shorted to the terminal plate 156 more easily.

The insulating plate 160 is positioned between the cap plate 151 and the electrode assembly 110. The insulating plate 160 may protect the electrode assembly 110, and in particular, may prevent the electrode assembly 110 from being damaged when the cap plate 151 is deformed therein. In addition, the insulating plate 160 may fix the position of the electrode assembly 110 in the case 140. In addition, although not shown in the drawings, the edge of the insulating plate 160 may be coupled to span the opening of the case 140. In addition, the insulation plate 160 may be coupled to the case 140 by a force fitting method.

The insulating plate 160 is located at the center of the central region 161, the coupling region 162 located at both sides of the central region 161, and at both sides of the coupling region 162. And a terminal region 163 located at the edge.

The vent hole 161a is formed at a position corresponding to the safety vent 154 in the central region 161, and an injection hole 161b is formed at a position corresponding to the electrolyte injection hole 152. In addition, the central region 161 includes a side portion 161c which contacts the case 140 and extends upward. The coupling area 162 is an area where the first current collecting tab 111 and the second current collecting tab 112 are coupled to each other. The coupling area 162 is wider than the central area 161 and the terminal area 163 so that the first and second current collecting

tabs

111 and 112 may protrude upward from the insulating plate 160. It is narrowly formed. In addition, a support portion 162a for supporting the lead tab 170 is formed in the coupling region 162. The support part 162a is formed at the center of the coupling region 162 along the longitudinal direction of the insulating plate 160 and protrudes upward. Accordingly, a space is formed between the coupling region 162 and the lead tab 170 by the height of the support part 162a, and the first current collecting tab 111 and the second current collecting tab 112 are positioned in the space. In addition, the support part 162a is provided with a protrusion 162b for coupling with the lead tab 170. In addition, the coupling region 162 includes an inclined surface 162c extending toward the case 140 and formed to be inclined. The inclined surface 162c is formed of the first current collector tab 111 and the second current collector tab 112 when the first current collector tab 111 and the second current collector tab 112 are led out of the insulating plate 160. In order to minimize the bending, it is preferable to have an inclination of about 45 degrees from the bottom surface of the insulating plate 160. The first electrode terminal 120 and the second electrode terminal 130 are positioned on the terminal region 163. In addition, the terminal area 163 includes a side portion 163a formed in contact with the case 140 and extending upward.

The lead tabs 170 are provided in pairs and are formed on the insulating plate 160. The lead tab 170 extends from the coupling region 162 of the insulating plate 160 to the terminal region 163. The lead tab 170 includes a first plate 171 formed in the coupling region 162 of the insulating plate 160 and a second plate 172 formed in the terminal region 163 of the insulating plate 160. Since the first plate 171 is coupled to the support part 162a of the coupling region 162, the first plate 171 is formed relatively higher than the second plate 172. That is, a step is formed between the first plate 171 and the second plate 172.

The first plate 171 is formed with a first through hole 173 to which the protrusion 162b of the support part 162a is coupled. That is, the lead tab 170 is coupled to the insulating plate 160 by coupling the protrusion 162b of the support part 162a to the first through hole 173. In addition, a first collector tab 111 and a second collector tab 112 are welded and electrically connected to a lower portion of the first plate 171, respectively. In addition, a first electrode terminal 120 and a second electrode terminal 130 are electrically connected to an upper portion of the second plate 172, respectively. That is, the lead tab 170 forms an electrical path between the first current collector tab 111 and the first electrode terminal 120 and between the second current collector tab 112 and the second electrode terminal 130. The second plate 172 is formed with a second through hole 174 to which the

coupling protrusions

123 and 133 of the first and

second electrode terminals

120 and 130 are coupled.

The insulating clip 180 bundles and fixes a plurality of first current collecting tabs 111 and second current collecting tabs 112, respectively. In addition, the insulating clip 180 serves to fix the first and second

current collector tabs

111 and 112 at a constant position at all times. Therefore, when the insulating plate 160 or the cap assembly 150 is inserted in the upper portion of the electrode assembly 110, the insulating clip 180 is pressed to the first and second

current collector tabs

111, 112 can be inserted into the first and second electrode plates to prevent shorting with other polarities.

Specifically, referring to FIGS. 6 to 8, the insulating clip 180 may include a first clip part 181, a second clip part 182 coupled to the first clip part 181, and the first clip. And a hinge portion 183 positioned between the portion 181 and the second clip portion 182. The first clip portion 181 and the second clip portion 182 are coupled to each other while being folded around the hinge portion 183. That is, the first and second

current collector tabs

111 and 112 are positioned between the first clip portion 181 and the second clip portion 182, respectively. Here, since the insulating clip 180 coupled to the first current collecting tab 111 and the second current collecting tab 112 are the same, the following description will be mainly focused on the insulating clip 180 coupled to the first current collecting tab 111.

The first clip portion 181 has a first central groove 181a formed in a longitudinal direction at the center thereof, first auxiliary protrusions 181b and first auxiliary protrusions positioned at both sides of the first central groove 181a. The first auxiliary holes 181c are formed at both sides of the 181b. Here, the longitudinal direction of the first clip portion 181 is called a first direction, and a direction perpendicular to the first direction is defined as a second direction. That is, the first center groove 181a is formed in parallel with the first direction at the center of the first clip portion 181, and the first auxiliary protrusion 181b is formed in the direction parallel to the first direction. It is formed on both sides of the first center groove 181a. In addition, the first auxiliary holes 181c are formed at both sides of the first auxiliary protrusion 181b in a second direction perpendicular to the first direction. Therefore, two first auxiliary protrusions 181b are formed, and four first auxiliary holes 181c are formed.

The second clip portion 182 is formed in a shape opposite to the first clip portion 181 so as to be coupled to the first clip portion 181. In detail, the second clip part 182 includes a second center protrusion 182a formed in a longitudinal direction at the center thereof, a second auxiliary hole 182b located at both sides of the second center protrusion 182a, and the second auxiliary protrusion. Second auxiliary protrusions 182c formed on both sides of the hole 182b are included. The second center protrusion 182a is coupled to the first center groove 181a, and the first auxiliary protrusion 181b is coupled to the second auxiliary hole 182b, and the second auxiliary protrusion 182c is connected to the second auxiliary protrusion 182c. Is coupled to the first auxiliary hole 181c. At this time. The first collector tab 111 is positioned between the second center protrusion 182a and the first center groove 181a. That is, the first current collecting tab 111 is inserted between the first center groove 181a and the second center protrusion 182a, and the coupling between the first auxiliary protrusion 181b and the second auxiliary hole 182b and the first It is fixed by the combination of the auxiliary hole 181c and the second auxiliary protrusion 182c. That is, the insulating clip 180 may stably fix the first current collecting tab 111 at both ends of the first current collecting tab 111.

The hinge portion 183 is positioned between the first clip portion 181 and the second clip portion 182 and is formed in a bendable form. Accordingly, the hinge portion 183 is formed to be thinner than the first clip portion 181 and the second clip portion 182, and the insulation clip 180 may be folded or unfolded based on the hinge portion 183. Can be.

In addition, referring to FIG. 4, the insulating clip 180 is coupled to the first current collecting tab 111, and the first current collecting tab 111 protruding to an upper portion of the insulating clip 180 is bent to insulate the insulating clip 180. It is positioned in the bonding region 162 of the plate 160. Subsequently, the insulating clip 180 is coupled to the first current collecting tab 111, and the lead tab 170 is welded to the first current collecting tab 111 protruding to the upper portion of the insulating clip 180. The first current collector tab 111 is bent to be placed in the coupling region 162 of the insulating plate 160. In this case, the insulating clip 180 contacts the inclined surface 162c of the coupling region 162, and the protrusion 162b of the coupling region 162 is formed in the first through hole 173 of the lead tab 170. Combined.

As described above, the secondary battery 100 according to the exemplary embodiment includes an insulating clip 180 for fixing the plurality of

current collector tabs

111 and 112, so that the current collector tab may be pressed even when the electrode assembly 110 is pressed. 111 and 112 may be inserted into the electrode assembly 110 to prevent the short. Accordingly, the safety of the secondary battery 100 according to an embodiment of the present invention can be improved.

What has been described above is just one embodiment for carrying out the secondary battery according to the present invention, and the present invention is not limited to the above-described embodiment, and the claims are deviated from the gist of the present invention. Without this, anyone skilled in the art to which the present invention pertains will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims

An electrode assembly having a plurality of current collector tabs;

A case accommodating the electrode assembly;

A cap plate sealing the case on top of the case; And

And an insulating clip fixing the plurality of current collecting tabs at both ends of the plurality of current collecting tabs.
The method of claim 1,

The insulating clip includes a first clip portion, a second clip portion coupled to the first clip portion, and a hinge portion disposed between the first clip portion and the second clip portion and thinner than the thickness of the first and second clip portions. Secondary battery characterized by the above-mentioned.
The method of claim 2,

The insulating clip is bent around the hinge portion, the secondary battery, characterized in that the first clip portion and the second clip portion are coupled to each other.
The method of claim 2,

The plurality of current collector tabs are positioned between the first clip portion and the second clip portion.
The method of claim 2,

The first clip portion

A first center groove formed in the center in the longitudinal direction;

First auxiliary protrusions formed at both sides of the first center groove and formed in a direction parallel to the first center groove; And

And a first auxiliary hole formed at both sides of the first auxiliary protrusion and formed in a direction perpendicular to the first center groove.
The method of claim 5, wherein

The second clip portion

A second center protrusion formed in a longitudinal direction at the center thereof and coupled to the first center hole;

Second auxiliary holes formed at both sides of the second central protrusion and coupled to the first auxiliary protrusion; And

And a second auxiliary protrusion formed on both sides of the second auxiliary hole and coupled to the first auxiliary hole.
The method of claim 1,

An insulating plate located between the electrode assembly and the cap plate;

An electrode terminal penetrating the cap plate and electrically connected to the electrode assembly;

And a lead tab positioned on the insulating plate and electrically connecting the electrode terminal and the plurality of current collector tabs.
The method of claim 7, wherein

The insulation plate has a central region,

Coupling regions positioned at both sides of the central region and to which the plurality of current collecting tabs are coupled; And

Located at both sides of the coupling region, and includes a terminal region in which the electrode terminal is located,

And the lead tab is coupled to the coupling region and the terminal region.
The method of claim 8,

The coupling region has a narrower width than the central region and the terminal region, and includes an inclined surface that is inclined toward the case.

And the insulating clip contacts the inclined surface.
The method of claim 8,

The coupling region protrudes upwardly and includes a support portion to which the lead tab is coupled, and the plurality of current collector tabs are positioned between the lead tab and the coupling region.