KR20190127089A - Cap assembly for rechargeable battery and rechargeable batter comprising the same - Google Patents

Abstract

The present invention relates to a cap assembly for a rechargeable battery and a rechargeable battery including the same. According to the present invention, the cap assembly for a rechargeable battery comprises: a top cap forming a terminal having an outlet; a safety vent positioned under the top cap and having a notch formed to be reversed in shape toward the top cap and ruptured when an inner pressure of a battery is increased; a current blocking member positioned under the safety vent and including a central portion connected to the safety vent and an outer peripheral portion not connected to the safety vent; and a blocking member gasket surrounding the outer circumferential surface of the current blocking member and insulating the safety vent and the outer circumferential surface of the current blocking member from each other. The current blocking member may further include a heat-resistant insulating member disposed at a position facing the blocking member gasket to insulate the outer circumferential surface and the safety vent from each other even when the blocking member gasket is melted due to heat generated by an external short circuit.

Description

CAP ASSEMBLY FOR RECHARGEABLE BATTERY AND RECHARGEABLE BATTER COMPRISING THE SAME}

The present invention relates to a secondary battery cap assembly and a secondary battery comprising the same.

Secondary batteries, unlike primary batteries, can be recharged and have been researched and developed in recent years due to the possibility of miniaturization and large capacity. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.

In particular, the lithium secondary battery has an operating voltage of 3.6 V, and has a capacity of about three times that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and has a high energy density per unit weight. Is rapidly increasing.

Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. In addition, the lithium secondary battery may be classified into a square battery, a cylindrical battery, and a pouch type battery.

In addition, the lithium ion secondary battery includes an electrode assembly in which a positive electrode / separator / cathode is sequentially arranged, and a packaging material for sealingly storing the electrode assembly together with the electrolyte solution. In addition, the packaging material of the rectangular or cylindrical secondary battery includes a case having an open end and a cap assembly sealingly coupled to the open end of the case.

Korean Unexamined Patent Publication No. 10-2009-0105547

One aspect of the present invention is that when the heat generation of the cap assembly due to the external short circuit of the secondary battery, the insulating portion between the current blocking member and the safety vent is melted (melting), so that the disconnection function of the electrical connection is not exhibited when the internal pressure increases. An object of the present invention is to provide a secondary battery cap assembly and a secondary battery including the same.

In addition, another aspect of the present invention is a cap for the secondary battery that can block the heat transfer so that the main gasket sealing between the cap assembly and the can (Melting) during the heat generation of the cap assembly due to the external short circuit of the secondary battery. An assembly and a secondary battery including the same are provided.

The cap assembly for a secondary battery according to an embodiment of the present invention includes a top cap forming a terminal having an outlet and a lower portion of the top cap, such that the shape is reversed and bursts in the direction of the top cap when the internal pressure of the battery increases. A safety vent formed with a notch, a current interruption member positioned below the safety vent, including a central portion connected to the safety vent, and an outer shell portion not connected, and surrounding an outer circumferential surface of the current interruption member, wherein the safety vent and the And a blocking member gasket to insulate between the outer circumferential surfaces of the current blocking member, wherein the current blocking member is insulated from the outer circumferential surface and the safety vent even when melting the blocking member gasket due to heat generated by an external short circuit. It may further include a heat resistant insulating member provided at a position facing.

On the other hand, the secondary battery according to an embodiment of the present invention, a secondary battery comprising an electrode assembly, a can opening the receiving portion accommodating the electrode assembly to one side, and a cap assembly covering one side of the can, the cap The assembly includes a top cap for forming a terminal having a discharge port, a safety vent positioned at a lower portion of the top cap, and having a notch formed so that a bending shape is reversed and ruptured when the internal pressure of the secondary battery increases. Located at the bottom of the vent, the current blocking member including a central portion and a non-external outer portion connected to the safety vent, and surrounding the outer circumferential surface of the current blocking member, to insulate between the safety vent and the outer circumferential surface of the current blocking member And a blocking member gasket, wherein the current blocking member is externally generated even when the blocking member gasket is melted due to heat generated by an external short circuit. Between the surface and the safety vent to be isolated, it may further include a heat insulating member provided at a position facing the shut-off member gasket.

According to the present invention, in the case of an external short circuit of the secondary battery, even if an insulating portion is melted between the current blocking member and the safety vent due to the heat generation of the cap assembly, a heat resistant insulating member is further provided to prevent abnormal connection between the current blocking member and the safety vent. You can prevent it from happening. In particular, even when the blocking member gasket insulated between the current blocking member and the safety vent is melted, a heat resistant insulating member is positioned at the portion of the current blocking member facing the blocking member gasket, thereby preventing abnormal connection between the current blocking member and the safety vent. You can cut it off completely. Accordingly, when the shape of the safety vent is reversed due to an increase in the battery breakdown voltage, when the junction between the current blocking member and the safety vent is spaced apart, abnormal connection may occur to the insulating portion and the current blocking function may be prevented.

In addition, according to the present invention, by providing a vent heat-resistant member in the cap assembly portion facing the main gasket, the main gasket for sealing between the cap assembly and the can (Can) when the cap assembly heats due to the external short circuit of the secondary battery Heat transfer can be blocked to prevent melting. Accordingly, the main gasket may be melted to prevent the occurrence of short due to contact between the can of the cathode and the cap assembly of the anode.

1 is a cross-sectional view illustrating a secondary battery in which a cap assembly for a secondary battery according to an embodiment of the present invention is installed.
2 is a cross-sectional view showing a cap assembly for a secondary battery according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a current blocking member in a cap assembly for a secondary battery according to an embodiment of the present invention.
4 is a perspective view illustrating a current blocking member in a cap assembly for a secondary battery according to an embodiment of the present invention.
5 is a cross-sectional view showing a cap assembly for a secondary battery according to another embodiment of the present invention.
6 is a cross-sectional view showing an installation state of an example of the vent heat-resistant member in the cap assembly for a secondary battery according to another embodiment of the present invention.
7 is a cross-sectional view showing another example of the installation of the vent heat-resistant member in the cap assembly for a secondary battery according to another embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In describing the present invention, detailed descriptions of related well-known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a cross-sectional view showing a secondary battery is installed secondary battery cap assembly according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a secondary battery cap assembly according to an embodiment of the present invention.

1 and 2, the cap assembly 100 for a secondary battery according to an embodiment of the present invention includes a top cap 110 positioned at an outer surface of the secondary battery 1 in which the electrode assembly 20 is embedded. A safety vent 120 positioned below the top cap 110, a current blocking member 130 positioned below the safety vent 120, and a blocking member surrounding the outer circumferential surface 135 of the current blocking member 130. The gasket 150 may be included, and the current blocking member 130 may include a heat resistant insulating member 132 provided at a position facing the blocking member gasket 150. In addition, the secondary battery cap assembly 100 according to an embodiment of the present invention may further include a main gasket 140 for sealing and insulating between the cap assembly 100 and the can 10.

Hereinafter, referring to FIGS. 1 to 4, a cap assembly 100 for a secondary battery, which is an embodiment of the present invention, will be described in detail.

Referring to FIGS. 1 and 2, the top cap 110 may be positioned at an outer surface of the secondary battery 1 in which the electrode assembly 20 is built, thereby forming a terminal having an outlet 111 formed therein.

In addition, the top cap 110 has a discharge port 111 is formed, it may be located on the outermost of the secondary battery (1).

In addition, the top cap 110 may form a terminal protruding at an upper end thereof, and may be electrically connected to the electrode assembly 20 accommodated in the secondary battery 1 to form a positive terminal or a negative terminal.

The safety vent 120 is located inside the secondary battery 1 rather than the top cap 110, and the notch 121 is reversed so that the shape of the secondary battery 1 is reversed in the direction of the top cap 110 when the internal pressure of the secondary battery 1 increases. Can be formed. Here, the safety vent 120 is provided in a shape bent in the direction of the current blocking member 130 to be in contact with the current blocking member 130, the center of the notch 121 when the internal pressure of the secondary battery 1 increases. As a result, the top cap 110 may be bent in an inverted shape and the contact with the current blocking member 130 may be released.

In addition, the safety vent 120 may open and close the outlet 111 of the top cap 110. Here, the safety vent 120 is positioned on a passage connecting the outlet 111 of the top cap 110 and the inside of the secondary battery 1. Accordingly, before the notch 121 formed in the safety vent 120 is ruptured, the outlet 111 of the top cap 110 is closed by the safety vent 120, and the safety vent (eg, the internal pressure of the secondary battery 1 is increased). When the notch 121 of the 120 is ruptured, the outlet 111 of the top cap 110 may be opened.

In addition, the notch 121 of the safety vent 120 may include a first notch 121a and a second notch 121b. For example, the first notch 121a may be formed along a line of a circle or an arc, and the second notch 121b may be formed along a line of a circle or an arc having a larger radius than the first notch 121a. At this time, when the internal pressure of the secondary battery 1 increases, the center of the safety vent 120 is moved toward the top cap 110 with respect to the second notch 121b, and a portion where the first notch 121a is formed is ruptured. Can be.

3 is a cross-sectional view showing a current blocking member in a cap assembly for a secondary battery according to an embodiment of the present invention, Figure 4 is a perspective view showing a current blocking member in a cap assembly for a secondary battery according to an embodiment of the present invention.

2 to 4, the current blocking member 130 is positioned below the safety vent 120, and includes a central portion 133 connected to the safety vent 120 and an outer portion 134 not connected to the safety vent 120. can do.

In addition, the current blocking member 130, the upper end of the central portion 133 is in contact with the lower end of the central portion 123 of the safety vent 120, and when the internal pressure increases, the central portion 123 of the safety vent 120 is the top cap 110 The electrical connection may be released by moving in the direction of) and releasing the contact between the safety vent 120 and the current blocking member 130. In this case, the current blocking member 130 and the safety vent 120 may be maintained in contact with each other by welding, and the safety vent 120 and the current blocking member 130 may be mutually separated due to a welded portion when the internal pressure increases. Spaced apart and the contact can be released. Meanwhile, a discharge hole 136 may be formed in the current blocking member 130 to allow gas to move from a lower portion of the electrode assembly 20 to an upper portion of the safety vent 120.

On the other hand, the current blocking member 130 is a position facing the blocking member gasket 150 so as to be insulated between the outer peripheral surface 135 and the safety vent 120 even when the blocking member gasket 150 due to the heat generated by the external short circuit. It may further include a heat resistant insulating member 132 provided in.

In addition, the current blocking member 130 may include a receiving groove 131 in which the heat resistant insulating member 132 is accommodated on the outer circumferential surface 135. Here, the height of the receiving groove 131 is to correspond to the height of the heat resistant insulating member 132 so that the top of the outer portion 134 and the top of the heat resistant insulating member 132 of the current blocking member 130 are located on the same plane. Can be formed. Accordingly, the height of the upper end of the heat resistant insulating member 132 is higher than the upper end of the outer portion 134 of the current blocking member 130 to prevent the problem that the entire thickness of the cap assembly 100 becomes thick. In addition, when the height of the upper end of the heat resistant insulating member 132 is lower than the top of the outer portion 134 of the current blocking member 130, a gap is generated between the blocking member gasket 150 and the heat resistant insulating member 132. Thus, the problem of weakening of the bonding force can be prevented. In addition, the length a of the heat resistant insulating member 132 measured from the outer circumferential surface 135 of the current blocking member 130 toward the center of the current blocking member 130 is a current from the outer circumferential surface 135 of the current blocking member 130. The blocking member 130 may be formed longer than the length (b) of the blocking member gasket 150 measured in the center direction. Accordingly, the outer circumferential surface of the current blocking member 130 through the heat resistant insulating member 132 also during melting of the blocking member gasket 150 that insulates the outer circumferential surface 135 of the current blocking member 130 and the safety vent 120. Between the 135 and the safety vent 120 may be insulated.

The heat resistant insulating member 132 may include a material having high heat resistance and electrical insulation properties. Accordingly, the heat resistant insulating member 132 maintains electrical insulation characteristics without being melted by high heat, so that the outer circumferential surface 135 of the current blocking member 130 and the safety vent even after the blocking member gasket 150 is melted by high heat. It can insulate between 120.

The heat resistant insulating member 132 may be made of, for example, a thermosetting resin. In this case, the heat resistant insulating member 132 may be made of polyimide (PI) tape. Here, the polyimide tape may be formed of a substrate made of thermosetting polyimide and an adhesive layer provided on one side or both sides of the substrate.

In addition, the heat resistant insulating member 132 may be made of glass fiber as another example.

In addition, the heat resistant insulating member 132 may be made of glass fiber (Glass Fiber) and a thermosetting resin coated on the glass fiber as another example. In this case, the heat resistant insulating member 132 may be specifically made of, for example, silicon rubber coated on the outer surface of the glass fiber and glass fiber.

The heat resistant insulating member 132 may be accommodated in the receiving groove 131 of the current blocking member 130 to prevent the current blocking member 130 and the blocking member gasket 150 from directly contacting each other. Accordingly, even when the blocking member gasket 150 is melted, the blocking member gasket 150 may insulate between the current blocking member 130 and the safety vent 120. More specifically, a heat resistant insulating member 132 made of a high heat resistant and insulating material is positioned between the current blocking member 130 and the blocking member gasket 150, so that when the blocking member gasket 150 is melted by heat, the blocking member gasket ( The edge 122 of the safety vent 120 positioned above the 150 and the heat resistant insulating member 132 are in contact with each other, and the current blocking member 130 is in direct contact with the edge 122 of the safety vent 120. Can be prevented from reconnecting. That is, after contact is released between the upper end of the central portion 133 of the current blocking member 130 and the lower end of the central portion 123 of the safety vent 120, the upper end of the outer circumferential surface 135 of the current blocking member 130. The lower end of the edge 122 of the safety vent 120 may be prevented from contacting again by melting of the blocking member gasket 150.

Referring to FIG. 2, the blocking member gasket 150 may surround the outer circumferential surface 135 of the current blocking member 130 and may insulate between the safety vent 120 and the outer circumferential surface 135 of the current blocking member 130. .

In addition, the blocking member gasket 150 may be provided to surround the upper side and the outer circumferential surface 135 at the outer circumferential surface 135 of the current blocking member 130.

In addition, the blocking member gasket 150 faces the upper portion 151 provided at a position corresponding to the upper end of the outer circumferential surface 135 of the current blocking member 130 and the side of the outer circumferential surface 135 of the current blocking member 130. It may include a side portion 152 provided in.

In addition, the upper surface of the upper portion 151 of the blocking member gasket 150 faces the lower surface of the edge 122 of the safety vent 120, and the lower surface of the upper portion 151 of the blocking member gasket 150 is a heat resistant insulating member. It may face the upper end of the outer circumferential surface 135 of the current blocking member 130 with the 132 therebetween.

Here, the upper portion 151 of the blocking member gasket 150 extends along a horizontal direction parallel to the upper end of the current blocking member 130, and the side portion 152 is in a vertical direction parallel to the side of the current blocking member 130. It can be extended along. In this case, the blocking member gasket 150 may be formed, for example, bent in a “a” shape.

Referring to FIGS. 1 and 2, the main gasket 140 cans accommodate the edge 122 of the safety vent 120 and the electrode assembly 20 surrounding the outer circumferential surface 135 of the top cap 110. It is possible to seal and insulate between (10). That is, the main gasket 140 may include an insulating material to seal and insulate the cap assembly 100 and the can 10.

In addition, the main gasket 140 may extend to a lower portion of the lower side of the outer circumferential surface 135 of the current blocking member 130 and may support a lower end of the outer circumferential surface 135 of the current blocking member 130. In this case, the blocking member gasket 150 may be connected to the lower side of the main gasket 140. That is, for example, the lower portion of the main gasket 140 surrounds the lower end of the outer circumferential surface 135 of the current blocking member 130, and the blocking member gasket 150 covers the upper and side surfaces of the outer circumferential surface 135 of the current blocking member 130. It may be provided to wrap.

Hereinafter, a cap assembly for a secondary battery according to another embodiment of the present invention will be described.

5 is a cross-sectional view showing a cap assembly for a secondary battery according to another embodiment of the present invention.

Referring to FIG. 5, the cap assembly 200 for a secondary battery according to another embodiment of the present invention includes a top cap 110 and a top cap positioned at an outer side of the secondary battery 1 in which the electrode assembly 20 is embedded. The safety vent 120 located below the safety vent 120, the current blocking member 130 positioned below the safety vent 120, and the blocking member gasket 150 surrounding the outer circumferential surface 135 of the current blocking member 130. ), The vent heat resistance provided at the edge 122 of the main gasket 140 for sealing and insulating the cap assembly 200 and the can 10, and the safety vent 120 facing the main gasket 140. The member 260 may be included, and the current blocking member 130 may include a heat resistant insulating member 132 provided at a position facing the blocking member gasket 150. (See Fig. 1)

Secondary battery cap assembly 200 according to another embodiment of the present invention, when compared with the secondary battery cap assembly 100 according to an embodiment, the vent heat-resistant member between the safety vent 120 and the main gasket 140 There is a difference that further includes 260. Therefore, the present embodiment briefly describes the contents overlapping with the embodiment, and will be described based on the difference.

In more detail, referring to FIG. 5, in the secondary battery according to another exemplary embodiment of the present invention, the vent heat-resistant member 260 is configured to transfer heat of the top cap 110 to the main gasket 140 through the safety vent 120. It may be provided between the edge 122 of the safety vent 120 and the main gasket 140 to block it. In this case, for example, the vent heat resistant member 260 may be located between the upper end of the main gasket 140 and the safety vent 120.

In addition, the vent heat-resistant member 260 may include a material having high heat resistance characteristics and electrical insulation characteristics.

Here, the vent heat-resistant member 260 may be made of, for example, a thermosetting polyimide (PI) tape.

In addition, the vent heat-resistant member 260 may be made of glass fiber as another example.

In addition, the vent heat-resistant member 260 may be made of glass fiber and a thermosetting resin coated on the glass fiber as another example. At this time, the vent heat-resistant member 260 may be specifically made of, for example, a glass (silicon) rubber coated on the outer surface of the glass fiber.

In addition, the main gasket 140 surrounds the edge 122 of the safety vent 120 and the vent heat resistant member 260 together, and the vent heat resistant member 260 is disposed on the upper surface of the edge 122 of the safety vent 120. Is provided, it is possible to prevent the upper surface of the edge 122 of the safety vent 120 and the portion of the main gasket 140 facing the direct contact. At this time, the vent heat-resistant member 260 is made of a high heat-resistant material to block the high heat of the top cap 110 or safety vent 120 to the main gasket 140 to melt the main gasket 140 by the heat (Melting) ) Can be prevented. Accordingly, the upper end 11 of the can 10 surrounding the outer surface of the main gasket 140 prevents the main gasket 140 from melting and contacting the upper surface of the edge 122 of the safety vent 120 to be electrically energized. can do.

6 is a cross-sectional view showing an installation state of an example of the vent heat-resistant member in the secondary battery cap assembly according to another embodiment of the present invention, Figure 7 is a vent heat-resistant member in the secondary battery cap assembly 200 according to another embodiment of the present invention A cross-sectional view showing an installation state of another example.

Referring to FIG. 6, the vent heat resistant member 260 ′ may be provided in a stacked form on an upper surface of the edge 122 of the safety vent 120, for example.

Meanwhile, referring to FIG. 7, the vent heat resistant member 260 ″ may be formed of a tape and attached to an upper surface of the edge 122 of the safety vent 120. Here, the vent heat resistant member 260 ″ may be provided. ) May include a substrate 261 and an adhesive layer 262 applied to one surface of the substrate 261. The substrate 261 may be made of a thermosetting resin as a first example. In this case, the substrate 261 may be made of polyimide (PI), for example. Meanwhile, the substrate 261 may be made of glass fiber as a second example.

Hereinafter, a secondary battery according to an embodiment of the present invention will be described.

1 and 5, a secondary battery 1 according to an embodiment of the present invention includes a secondary battery cap assembly 100 and a secondary battery cap assembly 200 according to another embodiment. It relates to a secondary battery (1) containing. Therefore, the present embodiment briefly describes the overlapping contents with the above-described embodiments, and focuses on the differences.

Referring to FIG. 1, the secondary battery 1 according to an exemplary embodiment of the present invention may include an electrode assembly 20, a can 10 in which a receiving portion in which the electrode assembly 20 is accommodated is opened to one side, and a can 10. A secondary battery 1 including a cap assembly 100 covering one side of the cap assembly 100 includes a top cap 110 positioned at an outer side of the secondary battery 1 in which the electrode assembly 20 is embedded. A safety vent 120 positioned below the top cap 110, a current blocking member 130 positioned below the safety vent 120, and a blocking member surrounding the outer circumferential surface 135 of the current blocking member 130. The gasket 150 may be included, and the current blocking member 130 may include a heat resistant insulating member 132 provided at a position facing the blocking member gasket 150. 5, the secondary battery 1 according to the embodiment of the present invention faces the main gasket 140 and the main gasket 140 to seal and insulate the cap assembly 200 and the can 10. It may further include a vent heat-resistant member 260 provided on the edge portion 122 of the safety vent 120 to be.

The secondary battery 1 according to the embodiment of the present invention includes an electrode assembly 20, a can 10 for receiving the electrode assembly 20, and a cap assembly 100 covering an open portion of the can 10. can do.

The electrode assembly 20 is a power generator capable of charging and discharging, and the positive electrode 21, the negative electrode 22, and the separator 24 are assembled to form a stacked structure.

The separator 24 electrically insulates the positive electrode 21 and the negative electrode 22 from each other. In this case, the positive electrode 21 and the negative electrode 22 may be wound together with the separator 24 to form a jelly roll type. In addition, the separator 24 is made of an insulating material to electrically insulate between the positive electrode 21 and the negative electrode 22. Here, the separator 24 may be formed of, for example, a polyolefin resin film such as polyethylene or polypropylene having microporosity. The anode 21, the cathode 22, and the separator 24 may be formed in a sheet form, for example.

The can 10 may be formed in a shape in which a receiving portion in which the electrode assembly 20 is accommodated is opened upward. The can 10 may be formed, for example, in a cylindrical shape with a closed lower portion. In this case, the cap assembly 100 may be provided to cover the open upper side of the can 10.

Meanwhile, the electrode assembly 20 may be electrically connected to the lower portion of the current blocking member 130 through the electrode lead 25. Here, for example, in the electrode assembly 20, the anode 21 is electrically connected to the current interruption member 130 through the electrode lead 25 and the safety vent 120 connected to the current interruption member 130. It may be connected to the top cap 110 through. In this case, a portion protruding from the upper side of the top cap 110 may form a positive electrode terminal.

Although the present invention has been described in detail through specific examples, this is for describing the present invention in detail, and the secondary battery cap assembly and the secondary battery including the same are not limited thereto. Various implementations may be made by those skilled in the art within the technical idea of the present invention.

Further specific scope of protection of the invention will be apparent from the appended claims.

1: secondary battery
10: cans
11: top
20: electrode assembly
21: anode
22: cathode
23: electrode
24: separator
25: electrode lead
100,200: cap assembly
110: top cap
111: outlet
120: safety vent
121: notch
121a: first notch
121b: second notch
122: edge
123: central part
130: current blocking member
131: storage groove
132: heat resistant insulating member
133: central
134: outer shell
135: outer circumference
136: discharge hole
140: main gasket
150: blocking member gasket
151: upper side
152: side
260,260 ', 260 "Vent Heat Resistant

Claims (12)

A top cap forming a terminal formed with an outlet;
A safety vent positioned below the top cap and having a notch formed such that the shape of the battery is reversed in the top cap direction when the internal pressure of the battery increases;
A current blocking member positioned below the safety vent and including a central portion connected to the safety vent and an outer portion not connected to the safety vent; And
A blocking member gasket surrounding an outer circumferential surface of the current blocking member and insulating between the safety vent and an outer circumferential surface of the current blocking member,
The current blocking member further includes a heat-resistant insulating member provided at a position facing the blocking member gasket so that the outer circumferential surface and the safety vent are insulated even when the blocking member gasket is melted due to heat generated by an external short circuit. Assembly. The method according to claim 1,
The blocking member gasket surrounds the upper and side surfaces of the outer circumferential surface of the current blocking member,
The current blocking member is a cap assembly for a secondary battery is formed with a receiving groove for receiving the heat-resistant insulating member on the upper peripheral surface. The method according to claim 2,
The heat resistant insulating member is a secondary battery cap assembly comprising a thermosetting resin. The method according to claim 3,
The heat resistant insulating member is a polyimide (PI) tape, and is a cap assembly for a secondary battery attached to a receiving groove of the current blocking member. The method according to claim 2,
The heat resistant insulating member is a secondary battery cap assembly comprising a glass fiber (Glass Fiber). The method according to claim 2,
And a height of the accommodating groove is formed to correspond to a height of the heat resistant insulating member such that an upper end of the outer portion of the current blocking member and an upper end of the heat resistant insulating member are located on the same plane. The method according to claim 1,
The length of the heat resistant insulating member measured from the outer peripheral surface of the current blocking member toward the center of the current blocking member is longer than the length of the blocking member gasket measured from the outer peripheral surface of the current blocking member toward the center of the current blocking member. A secondary battery cap assembly. The method according to claim 1,
A main gasket sealing and insulating between an edge of the safety vent surrounding the outer circumferential surface of the top cap and a can containing an electrode assembly; And
And a vent heat resistant member further provided at an edge portion of the safety vent facing the main gasket to prevent heat from being transferred to the main gasket through the safety vent when the top cap is heated by an external short circuit. Cap assembly for secondary battery. The method according to claim 8,
The vent heat-resistant member is positioned on an upper surface of the edge of the safety vent, the cap assembly for a secondary battery is located between the upper end of the main gasket and the edge of the safety vent. The method according to claim 8,
The vent heat resistant member is positioned on an upper surface of the edge of the safety vent,
The main gasket is a cap assembly for a secondary battery surrounding the edge of the vent heat-resistant member and the safety vent. The method according to claim 8,
The vent heat-resistant member includes a thermosetting polyimide (PI) tape or glass fiber. A secondary battery comprising an electrode assembly, a can in which a receiving portion accommodating the electrode assembly is opened to one side, and a cap assembly covering one side of the can,
The cap assembly may include a top cap defining a terminal in which a discharge port is formed;
A safety vent positioned below the top cap and having a notch formed such that a bending shape is reversed in the top cap direction and burst when the internal pressure of the secondary battery increases;
A current blocking member positioned below the safety vent and including a central portion connected to the safety vent and an outer portion not connected to the safety vent; And
A blocking member gasket surrounding an outer circumferential surface of the current blocking member and insulating between the safety vent and an outer circumferential surface of the current blocking member,
The current blocking member further includes a heat-resistant insulating member provided at a position facing the blocking member gasket so that the insulating member is insulated from the outer circumferential surface and the safety vent even when melting the blocking member gasket due to heat generated by an external short circuit.

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