WO2018048075A1

WO2018048075A1 - Secondary battery

Info

Publication number: WO2018048075A1
Application number: PCT/KR2017/006926
Authority: WO
Inventors: 이현수; 변상원
Original assignee: 삼성에스디아이(주)
Priority date: 2016-09-06
Filing date: 2017-06-30
Publication date: 2018-03-15

Abstract

Disclosed is a secondary battery comprising: a case having a space therein; an electrode assembly inserted into the case and comprising a first electrode plate, a second electrode plate, and a separator formed therebetween; a cap plate for sealing an upper opening of the case; a vent hole formed by penetrating the cap plate; a terminal for a safety device, formed by penetrating the vent hole; a safety vent connected to a distal end of the terminal for a safety device; a connector one distal end of which is electrically connected to the safety vent, and the other distal end of which is connected to a first electrode terminal; and an insulator for a safety device, for providing insulation between the terminal for a safety device and the cap plate.

Description

Secondary battery

TECHNICAL FIELD This invention relates to a secondary battery. Specifically, It is related with the secondary battery provided with the safety device which can be applied also to a neutral can.

In general, a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. In the case of a low-capacity battery in which one battery cell is packed in a pack form, a secondary battery is used in portable electronic devices such as mobile phones and camcorders. Large capacity batteries with dozens of cells connected are used as motor power sources for electric bicycles, electric scooters, hybrid cars, and electric cars.

Secondary batteries are manufactured in various shapes, and typical shapes include square, cylindrical, and pouch types. The secondary battery is configured by accommodating an electrode assembly, an electrolyte solution in a case, and installing a cap plate on the case. In addition, an electrode tab, a terminal, and the like are connected to the electrode assembly, which is exposed or protruded to the outside through the cap plate.

On the other hand, when the secondary battery consumes too much power or the charging current is too large, the internal battery may explode due to an increase in pressure due to an extreme temperature increase in the battery cell. Therefore, there is a need for a secondary battery having a configuration capable of improving safety, and a secondary battery having a safety device that can be applied to a neutral can (or case).

The present invention provides a secondary battery having a device for shutting off a current when a safety vent breaks due to an overcurrent flowing in a neutral can or an increase in an internal pressure of the battery cell due to an overcharge. That is, the present invention provides a secondary battery having a safety device that can be applied to a neutral can.

Secondary battery according to an embodiment of the present invention case; An electrode assembly inserted into the case and including a first electrode plate, a second electrode plate, and a separator formed between the first electrode plate and the second electrode plate; A cap plate sealing the case, the cap plate having a vent hole; A safety device terminal formed through the vent hole; A safety vent connected to an end of the safety terminal; A connector having one end electrically connected to the safety vent and the other end connected to the first electrode terminal; And a safety device insulator for insulating between the safety device terminal and the cap plate.

The first electrode terminal may include a first terminal plate electrically connected to the connector.

The safety vent may have a coupling portion protruding from a central portion thereof, and one end of the connector may be electrically connected to the coupling portion.

The apparatus may further include a safety device plate that electrically connects the plain portion connected to the first electrode plate and the safety device terminal.

The safety device terminal may include a cylindrical body portion formed through the vent hole, and a vent receiving groove portion extending from an upper portion of the cylindrical body portion to accommodate the safety vent.

The insulator for the safety device may include an inner groove corresponding to an outer size of the vent accommodation groove to surround the vent accommodation groove, and the center of the inner groove may include a hole through which the cylindrical body portion may pass. Can be.

A safety gasket for enclosing the safety device terminal and disposed in a gap between the vent hole and the safety device terminal on the safety device plate to seal between the safety device terminal and the cap plate. It may further include.

The safety device terminal may include a gas discharge hole corresponding to the vent hole and configured to guide gas generated in the secondary battery in the safety vent direction.

The first terminal plate and the connector, the connector and the safety vent, the safety vent and the safety terminal may be combined by riveting or welding, respectively.

The secondary battery according to an embodiment of the present invention forms a current path by fixing the both ends of the connector for blocking current to the electrode terminal portion and the safety vent exposed to the outside outside the case, thereby increasing the pressure inside the battery cell safety When the vent is broken, it is possible to cut off the current to improve the safety of the secondary battery.

In addition, the secondary battery according to an embodiment of the present invention is a safety device that can be applied to the neutral can by separating the safety device configuration and the electrode terminal with a safety vent formed, and insulated between the terminal and the cap plate for the current flowing safety device Can be provided.

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 2-2 of FIG. 1.

3 is a perspective view of a safety vent according to an embodiment of the present invention.

4 is a cross-sectional view of a safety vent according to an embodiment of the present invention.

5 is a cross-sectional view illustrating a connection between a safety device and a first electrode terminal part applied to a neutral can according to an exemplary embodiment of the present invention.

6 is an exploded view of parts of a secondary battery including a safety device applied to a neutral can according to an embodiment of the present invention.

7 illustrates a normal current flow state of a secondary battery according to an embodiment of the present invention.

8 illustrates a state when a current is blocked by a secondary battery according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, the same reference numerals in the drawings refer to the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In addition, the term "connected" in this specification means not only the case where the A member and the B member are directly connected, but also the case where the A member and the B member are indirectly connected by interposing the C member between the A member and the B member. do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise, include" and / or "comprising, including" means that the features, numbers, steps, actions, members, elements, and / or groups thereof mentioned. It is intended to specify the existence and not to exclude the presence or addition of one or more other shapes, numbers, operations, members, elements and / or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers, and / or parts, these members, parts, regions, layers, and / or parts are defined by these terms. It is obvious that not. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Accordingly, the first member, part, region, layer or portion, which will be described below, may refer to the second member, component, region, layer or portion without departing from the teachings of the present invention.

Terms relating to spaces such as "beneath", "below", "lower", "above", and "upper" are associated with one element or feature shown in the figures. It can be used for easy understanding of other elements or features. Terms related to this space are for easy understanding of the present invention according to various process conditions or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature in the figures is inverted, the element or feature described as "bottom" or "bottom" will be "top" or "top". Thus, "below" is a concept encompassing "top" or "bottom".

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 the line I-I of FIG. 1.

1 and 2, the secondary battery 100 according to an embodiment of the present invention includes a case 110, an electrode assembly 120, a first electrode terminal unit 140, a second electrode terminal unit 150, The cap plate 160, the safety vent 170, the connector 180, and the safety device 200 may be included.

Here, the safety device 200 refers to a configuration for blocking the flow of current when a pressure is generated in the secondary battery due to overcharging.

The case 110 has a substantially hexahedral shape in which an opening in which the electrode assembly 120 is inserted and seated is formed. Inside the opening of the case 110 includes a space for accommodating the electrode assembly 120 and the electrolyte. The case 110 may be formed of a metal such as aluminum or an aluminum alloy. In addition, the electrolyte solution may be formed of a lithium salt in an organic solvent, and the electrolyte solution may be liquid, solid, or gel. However, the material of the case 110 is not limited to the contents of the present invention.

The electrode assembly 120 is inserted into the case 110 and is disposed between the first electrode plate 121, the second electrode plate 122, and the first electrode plate 121 and the second electrode plate 122. It includes a separator 123 to be published in. The electrode assembly 120 is formed in the form of a jelly roll by winding a laminating agent of the first electrode plate 121, the second electrode plate 122, and the separator 123. In addition, the first electrode plate 121 may serve as an anode, and the second electrode plate 122 may serve as a cathode having a polarity opposite to that of the first electrode plate 121. However, the present invention is not limited thereto, and the electrode assembly 120 may have a structure in which a plurality of

electrode plates

121 and 122 are stacked. In addition, the polarities of the first electrode plate 121 and the second electrode plate 122 may act as a cathode and an anode, respectively.

The first electrode plate 121 and the second electrode plate 122 are coated

portions

121a and 122a on which the active materials are applied to the current collectors of the metal plates, and the current collectors protruded in the exposed and upper directions because the active materials are not coated. It includes a plain portion (121b, 122b) formed. The

non-coating portions

121b and 122b may be formed to be exposed and protruded upward in different regions of the first electrode plate 121 and the second electrode plate 122 to be wound, and each electrode and the external member. It is the passage of current flow in the liver.

Here, the

uncoated portions

121b and 122b may be referred to as electrode tabs in some cases.

The first electrode plate 121 as the anode may be formed of a metal foil such as aluminum, and both surfaces of the coating part 121a of the first electrode plate 121 are coated with an active material containing lithium-based oxide as a main component. .

The second electrode plate 122 as a cathode may be formed of a metal foil such as copper, and an active material mainly containing a carbon material is coated on both surfaces of the coating part 122a of the second electrode plate 122.

The separator 123 is positioned between the first electrode plate 121 and the second electrode plate 122 to prevent shorts and to allow movement of ions. The separator 123 may be made of polyethylene (PE), polypropylene (PP), or a composite film of polyethylene (PE) and polypropylene (PP).

However, the material of the first electrode plate 121, the second electrode plate 122, and the separator 123 is not limited in the present invention.

The first electrode terminal unit 140 may include a first electrode terminal 141, an insulating gasket 143, a first terminal plate 144, and an insulating first fastening plate 145.

The first electrode terminal 141 may include a body portion 141a and a flange portion 141b. The body portion 141a may have a cylindrical shape and is formed through the cap plate 160. The flange portion 141b is formed to extend in a horizontal direction from the lower side of the body portion 141a. The flange portion 141b prevents the first electrode terminal 141 from being removed from the cap plate 160.

The gasket 143 is formed of an insulating material between the first electrode terminal 141 and the cap plate 160 to seal between the first electrode terminal 141 and the cap plate 160.

The first terminal plate 144 is coupled to the first electrode terminal 141 protruding to the top of the cap plate 160 by riveting or welding. The first terminal plate 144 may be formed of a metal such as aluminum or an aluminum alloy. Accordingly, the first electrode terminal 141 is electrically connected to the first terminal plate 144, and the first terminal plate 144 is connected to the safety vent 170 and the safety device terminal through the connector 180. 201) is electrically connected.

The first fastening plate 145 is formed with a first electrode terminal hole 145a through which the first electrode terminal 141 can pass, and is formed to accommodate the first terminal plate 144. . The first electrode terminal 141 penetrates through the first terminal plate 145 and is coupled to the first terminal plate 144, and the combined first terminal plate 144 is the first fastening plate 145. It is seated on). The first fastening plate 145 may be any one of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), urethane, nylon, and teflon as an insulating material. Therefore, the first electrode terminal 141 and the first terminal plate 144 are not electrically connected to the cap plate 160 by the first fastening plate 145. However, the material of the first fastening plate 145 of the present invention is not limited.

The second electrode terminal unit 150 may have various configurations. For example, but not limited to, the second electrode terminal 150 may include a second electrode terminal 151, an insulating gasket 153, a second terminal plate 154, and an insulating second fastening plate 155, and lower insulation. The member 156 and the lower terminal plate 157 may be included.

The second electrode terminal 151 may have a cylindrical shape and is formed through the cap plate 160. The gasket 153 is formed of an insulating material between the second electrode terminal 151 and the cap plate 160 to seal between the second electrode terminal 151 and the cap plate 160.

The second terminal plate 154 may have a plate shape, and the second electrode terminal 151 is coupled and fixed. The second terminal plate 154 is coupled to the second electrode terminal 151 protruding to the top of the cap plate 160 by riveting or welding. The second terminal plate 154 is formed of a metal such as aluminum or an aluminum alloy.

The second fastening plate 155 includes a second electrode terminal hole 155a through which the second electrode terminal 151 can pass, and is formed to accommodate the second terminal plate 154. The second electrode terminal 151 penetrates through the second fastening plate 155 and is coupled to the second terminal plate 154. The second fastening plate 155 may be any one of polypropylene (PP), polyethylene (PE), PVC (polyvinyl chloride), urethane, nylon, and teflon as an insulating material. Therefore, the second electrode terminal 151 and the second terminal plate 154 are not electrically connected to the cap plate 160. However, the content of the present invention is not limited to the material of the second fastening plate 155.

The lower insulating member 156 is positioned under the cap plate 160. In addition, the second electrode terminal 151 and the insulating gasket 153 penetrate the lower insulating member 156.

The lower terminal plate 157 is positioned under the insulating gasket 153 and the lower insulating member 156, and in particular, is penetrated through the second electrode terminal 151. In particular, the uncoated portion 122b or the electrode tab is electrically connected to the upper surface of the lower terminal plate 157. Therefore, the current flows in the order of the uncoated portion 122b, the lower terminal plate 157, the second electrode terminal 151, and the second terminal plate 154 or the reverse order.

Meanwhile, the insulating plate 165 is interposed between the cap plate 160 and the electrode assembly 120. That is, the insulating plate 165 is disposed under the first electrode terminal portion 140 and the second electrode terminal portion 150. At this time, the

uncoated portions

121b and 122b extend a predetermined length in the upper direction through or bypassing the insulating plate 165.

The cap plate 160 is coupled to the case 110 to seal the opening of the case 110. A first electrode terminal hole 160a, a second electrode terminal hole 160b, and a vent hole for protruding each electrode terminal to a portion where the first electrode terminal 141 and the second electrode terminal 151 protrude. 160c and an electrolyte injection hole 160d may be provided.

On the other hand, the cap plate 160 may further include a main vent hole 160e formed through the center and a main safety vent 161 coupled to the vent hole 160e. The main safety vent 161 is broken when the internal pressure of the secondary battery is greater than or equal to the reference internal pressure, thereby reducing the internal pressure of the secondary battery. Since such a main safety vent 161 is not essential to the present invention, further description thereof will be omitted.

Subsequently, the vent hole 160c may have a stepped surface for seating and coupling the safety device terminal 201 and the safety device insulator 202 of the safety device 200.

The cap plate 160 may be formed of a metal such as aluminum or an aluminum alloy. In addition, the cap plate 160 may be formed of any one of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), urethane, nylon, and teflon as an insulating material. The cap plate 160 of the secondary battery according to the present invention includes an insulator 202, a first fastening plate 145, and a second fastening electrically connected to the first electrode plate 121 or the second electrode plate 122. It is insulated through the plate 155 to have an electrically neutral polarity. However, the material of the cap plate 160 is not limited to the contents of the present invention.

3 is a perspective view of a safety vent 170 according to one embodiment of the present invention. 4 is a cross-sectional view of the safety vent 170 according to an embodiment of the present invention. 5 is a cross-sectional view showing the connection between the safety device 200 and the first electrode terminal 140 applied to the neutral can 110 according to an embodiment of the present invention. 6 is an exploded view of a part of a secondary battery 100 including a safety device 200 applied to a neutral can 110 according to an embodiment of the present invention.

3 to 6, the safety device 200 is located in the vent hole 160c of the cap plate 160. The safety device 200 includes a safety vent 170, a connector 180, a safety device terminal 201, a safety device insulator 202, a safety device plate 203, a safety device gasket 205 and a safety device. A main plate 204 for the device.

The safety vent 170 is coupled across the vent receiving groove 201b of the safety terminal 201 to seal the vent hole 160c. The safety vent 170 is broken when the internal pressure of the secondary battery 100 reaches a set breaking pressure due to overcharging or overdischarging, such that the vent hole 160c is opened, thereby preventing explosion.

The safety vent 170 may include a fixing part 170a, a breaking part 170b, a notch 170c, a connection part 170d, and a coupling part 170e.

The fixing part 170a may be a portion coupled to the vent receiving groove 201b of the safety device terminal 201.

The breaking portion 170b is located inside the fixing portion 170a. Since the current should be cut off when the safety vent 170 is broken, the notch 170c may be formed on the bottom surface of the break 170b. On the other hand, the breaking pressure of the safety vent 170 can be set to the thickness and shape of the breaking portion 170b and the concave degree of the connecting portion 170d.

The connection part 170d connects the breaker part 170b and the coupling part 170e, and a lower surface of the coupling part 170e is formed to face the inside of the case as compared to the lower surface of the other area, and thus may be concave. have. When the safety vent 170 is broken, the concave shape of the connection portion 170d is reversed.

The coupling part 170e is positioned at an approximately center of the safety vent 170, and is a portion that is coupled to the connector 180. In particular, the coupling portion 170e should have a thickness of a certain degree or more because it is to be welded and coupled to the connector 180. Therefore, the thickness of the coupling part 170e may be formed relatively thicker than the connection part 170d and the breaking part 170b.

In addition, the safety vent 170 may be formed of the same material as the safety device terminal 201. The safety vent 170 coupled to the safety device terminal 201 is electrically connected to the safety device terminal 201 and the first electrode terminal 140.

The connector 180 is connected between the first terminal plate 144 of the first electrode terminal unit 140 and the safety vent 170 to electrically connect the two. One end of the connector 180 has a substantially rectangular plate shape and contacts the first terminal plate 144 of the first electrode terminal 140 to be electrically connected thereto. The connector 180 and the first terminal plate 144 may be coupled by rivet coupling or laser welding. In addition, it may be welded by ultrasonic welding, electric welding, arc welding, or the like, and the coupling method and material of the connector 180 are not limited to the present invention. The other end of the connector 180 is electrically connected to the coupling portion 170e of the safety vent 170 in a substantially rectangular plate shape or a semi-circular plate shape. The connector 180 may be formed of a metal such as aluminum or an aluminum alloy. Therefore, the first electrode terminal 140 is connected to the safety device terminal 201 through the connector 180 and the safety vent 170 connected to the first terminal plate 144.

The safety device terminal 201 is formed through the vent hole 160c of the cap plate 160, and may be manufactured in a cylindrical shape, an elliptic shape, or a rectangular pillar shape. The safety device terminal 201 also includes a cylindrical body portion 201a, a vent receiving groove portion 201b and a gas discharge hole 201c.

The cylindrical body portion 201a serves to fix the safety device terminal 201 to the cap plate 160 through the vent hole 160c and has an outer cross section corresponding to the size and shape of the vent hole 160c. Have The vent receiving groove 201b has a shape projecting radially outward from the upper end of the cylindrical body portion 201a, and corresponds to the shape of the safety vent 170 to accommodate and engage the safety vent 170. It is formed into a shape. If the safety vent 170 is formed in a circular shape as shown in FIG. 3, the vent receiving groove 201b is also preferably manufactured in a circular shape. In addition, the end of the vent receiving groove 201b is stepped so that the fixing portion 170a of the safety vent 170 can be fixed to the protrusion projecting upwardly and the inside of the protrusion to accommodate the safety vent 170. It may further include. In addition, the gas discharge hole 201c is a hole for guiding the pressure generated inside the secondary battery 100 toward the safety vent 170. Since the gas discharge hole 201c functions as the vent hole 160c, the diameter of the gas discharge hole 201c is preferably large so that the internal pressure can sufficiently break the safety vent 170.

The safety device terminal 201 is formed of copper or a copper alloy or aluminum or an aluminum alloy, and is electrically connected to the safety vent 170. In addition, the safety terminal 201 is welded by a safety vent and laser welding, ultrasonic welding, electrical welding, arc welding and the like.

The safety device insulator 202 functions to insulate between the safety device terminal 201 and the cap plate 160. The safety device insulator 202 is formed to surround at least the vent receiving groove 201b of the safety device terminal 201, and may be manufactured to surround a portion of the cylindrical body portion 201a. In addition, the insulator 202 for the safety device includes an inner groove corresponding to the outer size of the vent accommodation groove 201b so as to surround the vent accommodation groove 201b from the outside, and in the center of the safety device terminal 201b. The cylindrical body portion 201a includes a hole through which it can be fixed, and the safety device insulator 202 is seated and fixed on the step of the cap plate 160. On the other hand, the safety device insulator 202 is The insulating material may be any one of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), urethane, nylon, and teflon, so that the safety terminal 201 is electrically connected to the cap plate 160. Is not connected.

The safety device plate 203 is installed at the lower end of the vent hole 160c and functions to electrically connect the safety device main plate 204 and the safety device terminal 201. The safety device plate 203 is welded to the safety device terminal 201 by rivet bonding or laser welding, ultrasonic welding, electric welding, arc welding, or the like, and formed of a metal such as copper, a copper alloy, or an aluminum or aluminum alloy. do.

Further, the safety device main plate 204 is welded to the aforementioned safety device plate 203 by rivet bonding or laser welding, ultrasonic welding, electric welding, arc welding, or the like, and copper, copper alloy, or aluminum, aluminum alloy. It is formed of a metal such as. Furthermore, the uncoated portion 121b of the electrode assembly 120 is electrically connected to the main plate 204 for the safety device.

Accordingly, the current is not supported by the uncoated portion 121b, the safety plate main plate 204, the safety plate 203, the safety device terminal 201, the safety vent 170, the connector 180 and the first electrode terminal portion. Flow in the order of 140 or vice versa.

The safety device gasket 205 surrounds the safety device terminal 201 at the outside, and functions to seal between the safety device terminal 201 and the cap plate 160. A safety device gasket 205 is disposed in the gap between the vent hole 160c and the safety device terminal 201 on the safety device plate 203. Safety device gasket 205 may be any one of polypropylene (PP), polyethylene (PE), PVC (Polyvinyl Chloride), urethane, nylon, Teflon as an insulating material. Thus, the cap plate 160 and the safety terminal 201 are not electrically connected to each other. However, the material of the safety gasket 205 is not limited to the contents of the present invention.

Therefore, the first electrode terminal 140 is the safety vent 170, the safety device terminal 201, the safety device plate 203 and the safety device main through the connector 180 connected to the first terminal plate 144. The plate 204 is electrically connected to the plain portion 121b of the electrode assembly 120.

On the other hand, the stopper 190 seals the electrolyte injection hole 160d of the cap plate 160.

7 illustrates a normal current flow state of the secondary battery 100 according to an embodiment of the present invention. 8 is a diagram illustrating a state in which a secondary battery 100 cuts off a current according to an embodiment of the present invention.

First, referring to FIG. 7, in a normal situation, current flows to the safety device main plate 204 connected to the uncoated portion 121b of the first electrode plate 121, and the current flowed to the safety device main plate 204. The safety device plate 203, the safety device terminal 201, the safety vent 170, and the connector 180 flow to the first terminal plate 144 of the first electrode terminal unit 140.

Referring to FIG. 8, when the internal pressure of the secondary battery 100 is generated, gas may be supplied to the safety vent through the vent hole 160c (specifically, the gas discharge hole 201c of the safety terminal 201). It flows into the 170 to apply a pressure to the safety vent (170). When the internal pressure of the secondary battery 100 reaches a set breaking pressure, the safety vent 170 is broken so that the vent hole 160c (or the gas discharge hole 201c of the safety device terminal 201) is broken. Open. In the breaking process, since the cutout 170b of the safety vent 170 is formed with the notch 170c, it is relatively thinner than other parts so that the safety vent 170 may be easily broken when the safety vent 170 is deformed. In addition, when the safety vent 170 is broken, the connector 180 coupled to the safety vent 170 may be broken together. Therefore, when the breaker 170b is broken, the electrical connection between the safety device terminal 201 and the safety vent 170 and the connection between the safety vent 170 and the first terminal plate 144 are broken. Electrical connection between the electrode terminal 140 and the electrode assembly 120 is also cut off. Therefore, the current of the secondary battery 100 is cut off.

In FIGS. 7 and 8, the current path through the uncoated portion 121b of the electrode assembly 120 is not connected to the cap plate 160, but the main plate 204 for the safety device, the plate 203 for the safety device, and the safety device. It is connected to or disconnected from the connector 180 via the device terminal 201. That is, the cap plate 160 is the safety device terminal 201 or the safety device plate 203 and / or the safety device main plate 204 through the safety device insulator 202 and the safety device gasket 205. ), The rechargeable battery according to the embodiment of the present invention may be used as a neutral can.

As described above, the secondary battery 100 according to the embodiment of the present invention is coupled to the connector 180 between the safety vent 170 and the first terminal plate 144, the secondary battery 100 When the safety vent 170 is broken when the internal pressure increases, current may be blocked, thereby preventing explosion.

In addition, the secondary battery 100 according to the embodiment of the present invention is to be separated from the configuration of the safety device with the safety vent and the electrode terminal, and to insulate between the safety device terminal and the cap plate through which the current flows to be applied to the neutral can. Can provide safety devices.

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 scope of the present invention is departed from the scope of the following claims. 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.

[Description of the code]

100; Secondary battery 110; case

120; Electrode assembly 140; First electrode terminal portion

150; Second electrode terminal portion 160; Cap plate

170; Safety vent 180; connector

190; Stopper 200; safety device

201; Terminal for safety devices 202; Insulators for safety devices

203; Plates for safety devices 204; House

205; Gasket for safety device

Claims

case;

An electrode assembly inserted into the case and including a first electrode plate, a second electrode plate, and a separator formed between the first electrode plate and the second electrode plate;

A cap plate sealing the case, the cap plate having a vent hole;

A safety device terminal formed through the vent hole;

A safety vent connected to an end of the safety terminal;

A connector having one end electrically connected to the safety vent and the other end connected to the first electrode terminal; And

And a safety device insulator for insulating between the safety device terminal and the cap plate.
The method of claim 1,

And the first electrode terminal comprises a first terminal plate electrically connected to the connector.
The method of claim 1,

The safety vent is a secondary battery, characterized in that the coupling portion protruding in the center portion, one end of the connector is electrically connected to the coupling portion.
The method of claim 1,

And a safety device plate for electrically connecting the uncoated part connected to the first electrode plate and the safety device terminal.
The method of claim 4, wherein

The safety device terminal includes a cylindrical body portion formed through the vent hole, and a vent receiving groove portion extending from the upper portion of the cylindrical body portion to accommodate the safety vent.
The method of claim 5, wherein

The safety device insulator includes an inner groove corresponding to the outer size of the vent receiving groove so as to surround the vent receiving groove at an outer side, and the inner groove central portion includes a hole through which the cylindrical body portion can pass. Secondary battery characterized by the above-mentioned.
The method of claim 5, wherein

A safety gasket for enclosing the safety device terminal and disposed in a gap between the vent hole and the safety device terminal on the safety device plate to seal between the safety device terminal and the cap plate. Secondary battery, characterized in that it further comprises.
The method of claim 1,

The safety device terminal includes a gas discharge hole corresponding to the vent hole and guiding gas generated in the secondary battery in the safety vent direction.
The method of claim 2,

And the first terminal plate and the connector, the connector and the safety vent, the safety vent, and the safety terminal are respectively connected by riveting or welding.