KR20190102817A - Rechargeable battery - Google Patents

Abstract

Provided is a secondary battery capable of being reusable even if a fuse is melted (or dissolved, fused) by an external short circuit of a cell. According to one embodiment of the present invention, the secondary battery comprises: an electrode assembly charging and discharging current; a case receiving the electrode assembly; a cap plate coupled to an opening of the case; an electrode terminal installed in the cap plate; and a current collection member disposed between the cap plate and the electrode assembly to connect an uncoated tap of the electrode assembly with the electrode terminal. The current collection unit comprises: a rivet coupling part connected to the electrode terminal; a tap welding part separated from the rivet coupling part to be connected to the uncoated tap; and the fuse connecting the rivet coupling part with the tap welding part, or melted (or dissolved, fused) to be cut, and replaced when being melted (or dissolved, fused).

Description

Secondary Battery {RECHARGEABLE BATTERY}

The present invention relates to a secondary battery, and more particularly, to a secondary battery having a fuse that melts (or dissolves or melts) during an external short circuit of the cell to block a current between the electrode assembly and the electrode terminal.

A rechargeable battery is a battery that repeatedly performs charging and discharging, unlike a primary battery. Small capacity secondary batteries can be used in portable electronic devices such as mobile phones, notebook computers and camcorders, and large capacity secondary batteries can be used as power sources for driving motors of hybrid vehicles and electric vehicles.

For example, the secondary battery may include an electrode assembly that charges and discharges, a case accommodating the electrode assembly, a cap plate coupled to the opening of the case, a current collector electrically connected to the electrode assembly, and a current collector connected to the current collector. It includes an electrode terminal drawn out.

The current collector includes a fuse to electrically cut off the electrode assembly and the electrode terminal as the fuse melts (or melts or melts) during an external short circuit of the cell. In this case, since the current collector and the fuse are located inside the case and melted (or melted or melted) inside, the secondary battery may not be reused when the fuse melts (or melts or melts) in an external short circuit. In addition, when the current collector is ultrasonically welded to the tab of the electrode assembly as the fuse is located in the current collector, cracks may occur in the fuse.

One embodiment of the present invention is to provide a rechargeable battery that can be reused even when the fuse is melted (or melted or melted) due to an external short circuit of the cell. According to one embodiment of the present invention, when an overcharge safety device (OSD) is provided, a rechargeable battery that is reusable by replacing a fuse that melts (or melts or melts) during an external short circuit of the cell rather than the operation of the OSD may be replaced. To provide.

One embodiment of the present invention to provide a secondary battery that prevents the occurrence of cracks in the fuse even when the current collector is ultrasonically welded to the tab tab of the electrode assembly.

A secondary battery according to an embodiment of the present invention, an electrode assembly for charging and discharging a current, a case accommodating the electrode assembly, a cap plate coupled to the opening of the case, an electrode terminal provided on the cap plate, and the A current collector member disposed between the cap plate and the electrode assembly to connect the plain tab of the electrode assembly to the electrode terminal, wherein the current collector member is separated from the rivet coupling portion and the rivet coupling portion connected to the electrode terminal. A tab weld connected to the plain tab, and a fuse connected to the rivet coupling part and the tab weld, or melted (or melted or melted) to be broken, and replaced when melted (or melted or melted).

The current collecting member may further include a spacer member spaced apart from each other to fix the rivet coupling portion and the tab welding portion to be spaced apart from each other.

The spacer member may be formed of a mold of a synthetic resin material which is spaced apart and electrically separated from the rivet coupling portion and the tab welding portion.

The current collector member may include the fuse and be inserted into the spacer member through an insertion hole of the case to electrically connect the rivet coupling portion and the tab welding portion at both ends of the fuse, or when the fuse is melted (or melted or melted). It may further include an insertion member drawn out from the insertion hole.

The fuse has a set width in the insertion member and extends to a length set in an insertion direction, and both ends of the fuse may protrude from both sides of the insertion direction toward the radially outer side of the insertion member.

The insertion member may be formed of a mold of synthetic resin material in which the fuse is embedded to electrically insulate and protrude both ends of the fuse.

The spacer is a through hole formed in the insertion direction between the rivet coupling portion and the tab weld, the insertion groove formed in the insertion direction on the inner surface of the through hole, and the fastening formed in the circumferential direction of the through hole in the insertion groove A groove can be provided.

The insertion member may include an insert inserted corresponding to the through hole, and a fastening protrusion protruding from the outside of the insert to be inserted into the insertion groove and coupled to the fastening groove.

The insertion grooves may be formed in pairs in parallel in the insertion direction of the through holes on both sides of the through hole in the radial direction, and the fastening protrusions may be formed in the inserts in pairs to correspond to the insertion grooves.

The insertion member has a diameter larger than the insertion hole at the end of the insert to support the outer side of the insertion hole in the case, and is inserted into the insertion hole to support the inner surface of the case inside the insertion hole according to the rotation operation. It may further include a support protrusion formed on the inside of the flange at a distance from the flange so as to.

A sealing may be disposed between the inner surface of the flange and the outer surface of the case at the outside of the insertion hole.

Among the electrode terminals, the negative electrode terminal connected to the negative electrode of the electrode assembly is installed in an insulating structure on the cap plate via an overcharge safety device, and the positive electrode terminal of the electrode terminals connected to the positive electrode of the electrode assembly is energized to the cap plate. Can be installed into the structure.

The overcharge safety device is electrically connected to the rivet terminal of the negative electrode terminal which is installed in an insulating structure in the terminal hole of the cap plate, the shorting tab disposed on the outside of the cap plate via an insulating member, and the shorting tab The cap plate may include a membrane that is provided in the shorting hole of the cap plate to be inverted when the inner portion is raised and shorted to the shorting tab.

The rivet coupling part may be connected to the rivet terminal of the negative electrode terminal, and the tab welding part may be separated from the rivet coupling part and connected to the uncoated tab of the negative electrode.

The anode terminal may include a plate terminal electrically connected to the rivet terminal, and a top plate electrically insulated from the rivet terminal to electrically connect the plate terminal and the cap plate.

Thus, an embodiment of the present invention includes a rivet coupling portion, a tab welding portion, and a fuse in the current collector, and when the fuse is melted (or melted or melted) due to an external short circuit of the cell, the fuse may be replaced, thereby reusing the secondary battery. To do it. That is, in one embodiment, even when an overcharge safety device (OSD) is provided, when the fuse is melted (or melted or melted) due to an external short circuit of the cell rather than the operation of the OSD, the secondary battery may be replaced by replacing the fuse. Make it reusable.

In addition, in one embodiment, after the current collector member is ultrasonically welded to the tab of the uncoated tab in a state in which the rivet coupling portion and the tab welding portion are separated, the case and the cap plate are assembled, and a fuse is inserted into the case to rivet coupling portion and the tab welding portion. Enable to connect. Therefore, during ultrasonic welding of the flat tab and the tab weld, no crack is generated in the fuse.

1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
3 is a perspective view of an electrode assembly applied to FIG. 2.
4 is a cross-sectional view taken along the line IV-IV of FIG. 1.
5 is a perspective view of a current collector applied to FIG. 3.
6 is a plan view of FIG. 5.
FIG. 7 is a perspective view of one side of a separating member for separating and fixing a rivet coupling part and a tab welding part in the current collector of FIG. 5.
8 is a perspective view of the other side of the separating member for separating and fixing the rivet coupling portion and the tab weld in the current collector of FIG.
9 is a perspective view of an insertion member electrically connecting the rivet coupling part and the tab welding part with a fuse inserted and embedded in the separation member of FIG. 7.
10 is a plan view of the insertion member of FIG.
FIG. 11 is a cross-sectional view taken along the line II-XI of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. 1 and 2, a secondary battery according to an embodiment includes an electrode assembly 10 for charging and discharging current, a case 30 containing an electrode assembly 10 and an electrolyte, and an opening of the case 30. A cap plate 40 coupled to the 31 to seal the opening 31, a cathode terminal 51 and an anode terminal 52 installed on the cap plate 40, and a cap plate 40 and an electrode assembly 10. And a current collector member 71 or 72 disposed between the electrode assembly 10 and the negative and positive electrode terminals 51 and 52.

3 is a perspective view of an electrode assembly applied to FIG. 2. 2 and 3, the secondary battery may further include a top insulator 20 formed of an electrical insulating material. The top insulator 20 is disposed between the current collecting members 71 and 72 and the electrode assembly 10 between the cap plate 40 and the electrode assembly 10. Accordingly, the top insulator 20 electrically insulates the electrode assembly 10 and the cap plate 40, and also electrically insulates the current collecting members 71 and 72 and the electrode assembly 10.

1 and 2, the case 30 sets a space to accommodate the plate-shaped electrode assembly 10 and the electrolyte solution. For example, the case 30 is formed in a substantially rectangular parallelepiped, and has a rectangular opening 31 at one side thereof to insert the electrode assembly 10.

The cap plate 40 is coupled to the opening 31 of the case 30 to seal the case 30 and includes two terminal holes H1 and H2. For example, negative and positive terminals 51 and 52 are provided in the terminal holes H1 and H2. As an example, the case 30 and the cap plate 40 may be made of aluminum and welded to each other at the opening 31.

The negative electrode terminal 51 is installed in the cap plate 40 in an insulating structure, and the positive electrode terminal 52 is provided in the cap plate 40 in an energizing structure. Although not shown, when the positive electrode terminal is integrally formed on the cap plate, the cap plate may not include a terminal hole for installing the positive electrode terminal.

In addition, the cap plate 40 further includes a vent hole 41 and an electrolyte injection hole 42. The vent hole 41 is closed by the vent plate 411 to discharge the internal pressure caused by the gas generated inside the secondary battery by the charging and discharging action of the electrode assembly 10.

When the internal pressure of the secondary battery reaches the set pressure, the vent plate 411 is cut to open the vent hole 41 to discharge the gas and the internal pressure. The vent plate 411 has a notch 412 that leads to an incision.

The electrolyte injection hole 42 couples the cap plate 40 to the case 30 to weld the electrolyte, and then injects the electrolyte into the cap plate 40 and the case 30. After electrolyte injection, the electrolyte injection port 42 is sealed with a sealing stopper 421.

The top insulator 20 is disposed between the cap plate 40 and the electrode assembly 10 and has an internal vent hole 27. Since the internal vent hole 27 is formed to correspond to the vent hole 41 provided in the cap plate 40, the internal pressure that is increased by the gas generated in the electrode assembly 10 is increased by the vent hole above the top insulator 20. (41) can be discharged smoothly.

The top insulator 20 has an internal electrolyte injection hole 28. Since the internal electrolyte injection hole 28 is formed corresponding to the electrolyte injection hole 42 provided in the cap plate 40, the electrolyte solution through the electrolyte injection hole 42 is smoothly injected into the electrode assembly 10 under the top insulator 20. To be possible.

Referring again to FIGS. 2 and 3, the electrode assembly 10 includes a cathode 11 and a cathode 12 on both sides of a separator 13, which is an electrical insulation material, and includes a cathode 11, a separator 13, and an anode. It is formed by winding or laminating (not shown) 12.

The positive electrodes 11 and 12 are formed of coatings 111 and 121 coated with active materials on current collectors of metal foils (for example, Cu and Al foils), and current collectors exposed by not applying active materials. And non-stick tabs 112 and 122. Plain tabs 112 and 122 are disposed at one end of the wound electrode assembly 10.

That is, the plain tabs 112 of the negative electrode 11 are disposed at one side (left side of FIG. 3) at one end (the top of FIG. 3) of the electrode assembly 10 to be wound, and the plain tabs of the positive electrode 12 ( 122 is disposed on the other side (right side of FIG. 3) at a distance from the same end (top of FIG. 3) of the electrode assembly 10 to be wound.

Since the tabs 112 and 122 are provided for each winding of the electrode assembly 10 to flow a current to be charged and discharged, the overall resistance of the tabs 112 and 122 is reduced. Accordingly, the electrode assembly 10 may charge and discharge a high current through the tabs 112 and 122.

The electrode assembly 10 may be formed in one or a plurality (not shown) but in two embodiments. That is, the electrode assembly 10 may be formed in a plate shape that forms a semicircle at both ends of the y-axis direction so that the electrode assembly 10 may be accommodated in the case 30 having a substantially rectangular parallelepiped shape.

The negative electrode terminal 51 is a current collecting member 71 having an overcharge safety device 60, and is connected to the uncoated tab 112 of the negative electrode 11, and is insulated from the terminal hole H1 of the cap plate 40. Is installed. The positive electrode terminal 52 is connected to the uncoated portion tab 122 of the positive electrode 12 by the current collecting member 72, and is installed in the cap plate 40 in an energized structure.

The current collecting members 71 and 72 connect the plain tabs 112 and 122 and the negative and positive terminal 51 and 52 to discharge current from the electrode assembly 10 or to charge the electrode assembly 10. Connect to each other electrically.

Referring again to FIGS. 1 and 2, the positive and negative terminals 51 and 52 are electrically connected to the plate terminals 511 and 521 and the plate terminals 511 and 521 disposed on the outer surface of the cap plate 40. Rivet terminals 512 and 522 are installed in the terminal holes H1 and H2 via the gaskets 513 and 523.

4 is a cross-sectional view taken along the line IV-IV of FIG. 1. 1 to 4, the overcharge safety device 60 provided on the negative electrode terminal 51 side includes a shorting tab 61 and a membrane 62.

The shorting tab 61 is electrically connected to the rivet terminal 512 and is disposed outside the cap plate 40 via the insulating member 514. The membrane 62 is provided in the short-circuit hole 43 of the cap plate 40 so as to correspond to the short-circuit tab 61, and is reversed when the internal pressure rises (imaginary line of FIG.

The anode terminal 52 further includes a top plate 524 disposed between the plate terminal 521 and the outer surface of the cap plate 40. The top plate 524 electrically connects the plate terminal 521 and the cap plate 40 while being electrically insulated from the rivet terminal 522 by the gasket 523.

The gaskets 513 and 523 are installed between the rivet terminals 512 and 522 and the inner surface of the terminal holes H1 and H2, and between the rivet terminals 512 and 522 and the terminal holes H1 and H2 of the cap plate 40. Seal and electrically insulate.

The rivet terminals 512 and 522 are inserted into the terminal holes H1 and H2 through the gaskets 513 and 523, and the overcharge safety device 60, the top plate 524 and the plate are inserted into the rivet terminals 512 and 522. After engaging the terminals 511, 521, the rivet terminals 512, 522 are fixed to the plate terminals 511, 521 by caulking or welding the joining sites. As a result, the positive and negative terminals 51 and 52 may be installed in the cap plate 40 in an insulating and sealing structure.

FIG. 5 is a perspective view of a current collector applied to FIG. 3, FIG. 6 is a plan view of FIG. 5, and FIG. 7 is a perspective view of one side of a separating member that separates and fixes a rivet coupling part and a tab weld part from the current collector of FIG. 5. 8 is a perspective view of the other side of the separating member for separating and fixing the rivet coupling portion and the tab weld in the current collector of Figure 5, Figure 9 is a fuse inserted into the separation member of Figure 7 embedded rivet coupling portion and tab welding portion 10 is a perspective view of an insertion member electrically connected, and FIG. 10 is a plan view of the insertion member of FIG. 9.

2, 3, and 5 to 10, the current collector member 71 provided on the negative electrode terminal 51 side includes a rivet coupling portion 711, a tab welding portion 712, and a fuse 713. The rivet coupling part 711 is connected to the rivet terminal 512 of the negative electrode terminal 51 by riveting or welding. The tab weld 712 is separated from the rivet coupling part 711 and connected to the plain tab 112. The fuse 713 may be broken by connecting or melting (or melting or melting) the rivet coupling part 711 and the tab welding part 712, and may be replaced upon melting (or melting or melting) (FIGS. 9 and 10). .

For example, the tab weld 712 and the plain tab 112 may be connected by ultrasonic welding. As such, since the tab welding part 712 and the plain tab 112 are ultrasonically welded in a state in which the fuse 713 is not provided in the current collecting member 71, the crack of the fuse 713 according to the ultrasonic welding in the current collecting member 71. Occurrence can be prevented.

The current collecting member 71 further includes a spacer 714 for fixing the rivet coupling part 711 and the tab welding part 712 apart from each other. As an example, the spacer 714 may be formed of a mold of synthetic resin. The spacer 714 may be injection molded to space apart and electrically separate the rivet coupling part 711 and the tab welding part 712.

Therefore, the spacer 714 electrically insulates the connection portion between the fuse 713 and the rivet coupling part 711 and the tab welding part 712 when the current collecting member 71 is disposed inside the case 30. .

The current collecting member 71 further includes an insertion member 715 having a fuse 713 therein. As an example, the insertion member 715 may be formed of a mold of synthetic resin material. The insertion member 715 may be injection molded so as to electrically insulate the fuse 713 and protrude both ends of the fuse 713.

Therefore, the insertion member 715 is inserted into the spacer 714 through the insertion hole 32 of the case 30 to electrically connect the rivet coupling portion 711 and the tab welding portion 712 to both ends of the fuse 713 or When the fuse 713 is melted (or melted or melted), the fuse 713 may be drawn out from the insertion hole 32 of the spacer 714. That is, when the fuse 713 is melted (or melted or melted) due to an external short circuit of the cell, the cell can be reused by replacing the insertion member 715 including the fuse 713.

For example, the fuse 713 extends to a length set in the insertion direction with a set width in the insertion member 715, and protrudes both ends in the radial direction outside of the insertion member 715 on both sides of the insertion direction.

7 and 8, the spacer 714 includes a through hole 811, an insertion groove 812, and a fastening groove 813. The through hole 811 is formed in the insertion direction (x-axis direction) between the rivet coupling portion 711 and the tab welding portion 712. The insertion groove 812 is formed in the insertion direction (x-axis direction) on the inner surface of the through hole 811. The fastening groove 813 is formed in the circumferential direction of the through hole 811 in the insertion groove 812 (the direction of rotation about the x-axis as the rotation center).

The insertion member 715 includes an insert 821 and a fastening protrusion 822 corresponding to the spacer 714. The insert 821 is formed corresponding to the through hole 811 and is inserted into the through hole 811 in an insertion direction (x-axis direction). The fastening protrusion 822 protrudes to the outside of the insert 821, is inserted into the insertion groove 812 by the inserting operation of the insert 821, and after the insertion is completed, the rotation operation (x-axis) of the insert 821 is performed. Rotationally coupled to the fastening groove 813 in the direction of rotation about the rotation center.

The insertion grooves 812 are formed in pairs in parallel in the insertion direction of the through holes 811 at both sides of the through hole 811 in the radial direction, and the fastening protrusions 822 correspond to the insertion grooves 812. ) In pairs. Since the insertion groove 812 and the insert 821 are formed and coupled in pairs, the fastening force of the insertion member 715 and the spacer 714 may be strengthened and stabilized.

9 and 10, the insertion member 715 further includes a flange 823 and a support protrusion 824. The flange 823 is formed at the end of the insert 821 to have a diameter larger than that of the case 30 insertion hole 32 and is supported by the outer case 30 of the insertion hole 32. At this time, the insertion member 715 is coupled to the opposite side of the insertion hole 32 in the case 30 (see Fig. 4).

FIG. 11 is a cross-sectional view taken along the line II-XI of FIG. 1. 5 to 11, the support protrusion 824 is formed inside the flange 823 at a distance from the flange 823 so that the insert 821 is inserted into the insertion hole 32 and the insert 821. ), The inner surface of the case 30 is supported inside the insertion hole 32. Therefore, the support protrusion 824 pulls the flange 823 into the case 30 through the insertion hole 32.

A seal 825 is disposed between the inner surface of the flange 823 and the outer surface of the case 30 outside the insertion hole 32. When the support protrusion 824 pulls the flange 823 inwardly of the case 30, the support protrusion 824 compresses between the flange 823 and the case 30 to seal the insertion hole 32.

In one embodiment, when an external short occurs other than the operation of the overcharge safety device 60 (an external short circuit in which the membrane 62 contacts the shorting tab 61), the fuse 713 melts (or melts, melts) while being discharged. do. Accordingly, the driving of the secondary battery is stopped by an open circuit between the rivet coupling part 711 and the tab welding part 712 of the current collector member 71 on the negative electrode terminal 51 side.

In this case, the rivet coupling part 711 and the tab welding part 712 of the current collecting member 71 of the negative electrode terminal 51 side are replaced by coupling the insertion member 715 having the new fuse 713 to the spacer member 714. Is electrically connected again. Therefore, the tab tab 112 of the electrode assembly 10 is electrically connected to the negative electrode terminal 51 to enable the secondary battery to be reactivated.

As such, when the overcharge safety device 60 is provided and the fuse 713 is melted (or melted or melted) due to an external short circuit of the cell rather than the operation of the OSD, the fuse 713 and the insertion member 715 are replaced. Therefore, the secondary battery can be reused.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

10: electrode assembly 11, 12: negative, positive
13: Separator 20: Top Insulator
27: internal vent hole 28: internal electrolyte injection hole
30: case 31: opening
32: insertion hole 40: cap plate
41: vent hole 42: electrolyte injection hole
43: short-circuit hole 51, 52: um, positive terminal
60: overcharge safety device 61: short circuit tap
62: membrane 71, 72: current collector member
111, 121: coating portion 112, 122: plain tab
411: vent plate 412: notch
421: sealing stopper 511, 521: plate terminal
512, 522: rivet terminal 513, 523: gasket
514: insulating member 524: top plate
711: rivet coupling portion 712: tab welding portion
713: fuse 714: spacer
715: insertion member 811: through hole
812: insertion groove 813: fastening groove
821: insert 822: fastening protrusion
823: flange 824: support protrusion
825: sealing H1, H2: terminal hole

Claims (15)

An electrode assembly for charging and discharging current;
A case accommodating the electrode assembly;
A cap plate coupled to the opening of the case;
An electrode terminal installed on the cap plate; And
A current collector disposed between the cap plate and the electrode assembly to connect the tab of the electrode assembly to the electrode terminal;
Including;
The current collector member
Rivet coupling portion connected to the electrode terminal,
A tab welding part separated from the rivet coupling part and connected to the plain tab;
A fuse that connects or melts the rivet coupling part and the tab weld part and is replaced when the fuse is melted
Secondary battery comprising a. The method of claim 1,
The current collector member
Fixing the rivet coupling part and the tab welding part apart from each other,
Disposed inside the case
Secondary battery further comprising a spacer. The method of claim 2,
The spacer member
The secondary battery is formed of a mold of synthetic resin material spaced apart and electrically separated from the rivet coupling portion and the tab weld. The method of claim 2,
The current collector member
Built in the fuse,
It is inserted into the spacer through the insertion hole of the case to electrically connect the rivet coupling portion and the tab welding portion at both ends of the fuse or
When the fuse is melted is drawn out from the insertion hole
Secondary battery further comprising an insertion member. The method of claim 4, wherein
The fuse
Extend in a length set in an insertion direction with a set width in the insertion member,
Protruding the both ends toward the radially outer side of the insertion member at both sides of the insertion direction
Secondary battery. The method of claim 4, wherein
The insertion member
The secondary battery is formed of a molded of a synthetic resin material to electrically insulate the fuse and protrude both ends of the fuse. The method of claim 4, wherein
The spacer member
A through hole formed in an insertion direction between the rivet coupling part and the tab welding part;
An insertion groove formed in the insertion direction on an inner surface of the through hole, and
Fastening grooves formed in the circumferential direction of the through hole in the insertion groove
Secondary battery having a. The method of claim 7, wherein
The insertion member
An insert inserted corresponding to the through hole, and
A fastening protrusion protruding from the outside of the insert to be inserted into the insertion groove and coupled to the fastening groove
Secondary battery having a. The method of claim 8,
The insertion groove
Are formed in pairs in parallel in the insertion direction of the through holes on both sides in the radial direction from the through holes,
The fastening protrusion is
The pair is formed in the insert to correspond to the insertion groove
Secondary battery. The method of claim 8,
The insertion member
A flange formed at an end portion of the insert with a diameter larger than that of the insertion hole and supported by the case outside the insertion hole; and
A support protrusion inserted into the insertion hole and formed at an inner side of the flange at intervals from the flange to support the inner surface of the case from the inside of the insertion hole according to a rotation operation.
Secondary battery comprising more. The method of claim 10,
A secondary battery in which a sealing is disposed between an inner surface of the flange and an outer surface of the case outside the insertion hole. The method of claim 1,
The negative electrode terminal of the electrode terminals connected to the negative electrode of the electrode assembly is installed in an insulating structure on the cap plate via an overcharge safety device,
The anode terminal of the electrode terminals connected to the anode of the electrode assembly is provided in the conductive structure to the cap plate
Secondary battery. The method of claim 12,
The overcharge safety device is
A short-circuit tab electrically connected to the rivet terminal of the negative electrode terminal installed in the terminal hole of the cap plate in an insulating structure and disposed outside the cap plate via an insulating member;
The membrane is provided in the short-circuit hole of the cap plate to correspond to the short-circuit tab and is reversed when raised inside and short-circuited to the short-circuit tab.
Secondary battery comprising a. The method of claim 13,
The rivet coupling portion
Connected to the rivet terminal of the negative terminal;
The tab weld is
It is separated from the rivet coupling portion is connected to the plain tab of the negative electrode
Secondary battery. The method of claim 13,
The positive terminal
A plate terminal electrically connected to the rivet terminal, and
Top plate that electrically connects the plate terminal and the cap plate while being electrically insulated from the rivet terminal
Secondary battery comprising a.

Images