KR20090098522A - Secondary battery - Google Patents

Abstract

A secondary battery is provided to inhibit the explosion of a secondary battery by allowing the flow of electricity to a positive electrode plate and a negative electrode plate instantaneously in case of over-temperature, and to improve safety. A secondary battery(100) comprises an electrode assembly(110) which comprises a positive electrode plate(113), a negative electrode plate(115) and a separator(114); a can(120) which has a top aperture for accommodating the electrode assembly; and a first temperature device(170) which connects the positive electrode plate and the negative electrode plate, wherein the change rate of resistance to the increase of the temperature of the first temperature device is zero or negative. The first temperature device allows the flow of electricity of the positive electrode plate and the negative electrode plate at the temperature greater the preset first temperature.

Description

Secondary Battery {SECONDARY BATTERY}

The present invention relates to a secondary battery, and more particularly, to a secondary battery having increased safety by having a temperature element.

In general, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in the field of advanced electronic devices such as a cellular phone, a notebook computer, a camcorder, and the like. In particular, lithium secondary batteries have an operating voltage of 3.6V, which is three times higher than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as electronic equipment power sources, and are rapidly increasing in terms of high energy density per unit weight.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. Moreover, although lithium secondary batteries are manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

By the way, the secondary battery has a risk of explosion during overheating and overcharging and discharging. Therefore, an aspect of improving the safety of the secondary battery by preventing such an explosion has emerged as an important factor.

Therefore, the secondary battery is equipped with safety devices such as a PTC (Positive Temperature Coefficient device), a thermal fuse, and a protective circuit board, but in view of the portability of the secondary battery, it can be expanded to a large casualty accident in case of explosion. Is more demanding.

The present invention is to solve the above problems of the background art, the present invention provides a secondary battery having a temperature element to significantly increase the safety of the secondary battery even with excessive rise in temperature.

The secondary battery according to the present invention includes an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, a can having an upper opening formed therein so as to accommodate the electrode assembly, and a first temperature element connecting the positive electrode plate and the negative electrode plate. The rate of change of resistance to increase in temperature of the temperature element is characterized in that it is formed as zero or negative.

In this case, the first temperature element may conduct the positive electrode plate and the negative electrode plate at a predetermined first temperature or more, and the first temperature element may include vanadium oxide. In addition, the first temperature element may be formed including an NTC element.

The display device may further include a second temperature element electrically connected to any one of the positive electrode plate and the negative electrode plate, and blocking a flow of current at a predetermined second temperature or more. The second temperature element may be a PTC element. have. In this case, the first temperature may be greater than the second temperature.

In addition, each of the positive electrode plate and the negative electrode plate may include a positive electrode tab and a negative electrode tab which are drawn out to an upper portion of the electrode assembly, and the first temperature element may connect the positive electrode tab and the negative electrode tab.

In addition, the secondary battery according to the present invention, the positive electrode plate and the negative electrode plate has a positive electrode tab and a negative electrode tab which is drawn out to the upper portion of the electrode assembly, respectively, the cap plate and sealing the top opening of the can and the terminal through hole and the Further comprising an electrode terminal inserted into the terminal hole, wherein the positive electrode tab is connected to the cap plate, the negative electrode tab is connected to the electrode terminal, the first temperature element can connect the electrode terminal and the cap plate have.

In addition, the positive electrode plate and the negative electrode plate may include a positive electrode tab and a negative electrode tab, respectively, the negative electrode tab may be electrically connected to the can, and a first temperature element may connect the positive electrode tab and the can. The positive electrode plate and the negative electrode plate may include a positive electrode tab and a negative electrode tab, respectively, and may be electrically connected to the positive electrode tab and further include a cap up, and the first temperature element may connect the cap up and the can.

On the other hand, the secondary battery according to another aspect of the present invention includes an electrode assembly provided with a first electrode plate and a second electrode plate through a separator, a receiving portion for accommodating the electrode assembly, and forming the sealing portion to form the electrode assembly It includes a pouch for receiving, a first temperature element connecting the first electrode plate and the second electrode plate, the rate of change of resistance to the increase of the temperature of the first temperature element may be formed to zero or negative.

In this case, the first temperature element may conduct the first electrode plate and the second electrode plate at a predetermined first temperature or more, and the first temperature element may include vanadium oxide.

In addition, the secondary battery according to another aspect of the present invention comprises a second temperature element that is electrically connected to any one of the first electrode plate and the second electrode plate, and blocks the flow of current at a predetermined second temperature or more. It may further include, the first temperature may be formed larger than the second temperature.

In addition, each of the first electrode plate and the second electrode plate includes a first electrode tab and a second electrode tab, and the first electrode tab and the second electrode tab are exposed to the outside through the sealing part of the pouch. The first protection device may connect the first electrode tab and the second electrode tab.

The first protection element may be provided at any one of the sealing portion, the accommodating portion, and the outside of the pouch of the pouch.

The present invention is provided with a temperature element to instantaneously energize the positive electrode and the negative electrode at over temperature to suppress the explosion of the secondary battery significantly increases the safety of the secondary battery.

In addition, the present invention further increases the safety of the secondary battery since the temperature device whose resistance increases with increasing temperature and the temperature device whose resistance decreases with increasing temperature are sequentially operated.

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 can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. All terms including technical terms and scientific terms used hereinafter have the same meanings as commonly understood by one of ordinary skill in the art. Terms defined in advance are further interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined. In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of an upper side of the rechargeable battery according to an exemplary embodiment of the present invention. In addition, although the rectangular secondary battery is illustrated here, the present invention is not limited thereto.

1 and 2, the secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 110, a can 120 accommodating the electrode assembly 110, and a cap coupled to the can 120. Assembly 130 and a first temperature element 170 having a reduced resistance at a particular temperature.

The electrode assembly 110 is laminated between the positive electrode plate 113 and the negative electrode plate 115 and the separator 114 that insulates them between the positive electrode 113 and the negative electrode 115, and wound in a spiral shape to form a so-called 'jelly roll ( Jelly Roll) 'form. The negative electrode plate 115 and the positive electrode plate 113 may be formed by coating carbon, which is a negative electrode active material, and lithium cobalt oxide, which is a positive electrode active material, on a current collector made of copper and aluminum foil, respectively. The separator 114 may be made of polyethylene, polypropylene, or a copolymer of polyethylene and polypropylene.

The can 120 is a metal container having a substantially rectangular parallelepiped shape in the rectangular secondary battery as illustrated, and may be formed by a processing method such as deep drawing. Therefore, it is also possible that the can 120 itself performs a terminal role. The can 120 may be formed of aluminum or an aluminum alloy, which is a lightweight conductive metal. The can 120 becomes a container of the electrode assembly 110 and the electrolyte, and the upper part opened to the electrode assembly 110 is sealed by the cap assembly 130.

The cap assembly 130 includes a cap plate 140, an insulating plate 150, a terminal plate 160, and an electrode terminal 131. The cap plate 140 has a terminal through hole 141 formed therein, and the electrode terminal 131 is positioned on the outer surface thereof so as to penetrate the terminal through hole 141 by placing a gasket 133 for insulation with the cap plate 140. Is installed.

An insulating plate 150 is installed on the bottom surface of the cap plate 140, and a terminal plate 160 is installed on the bottom surface of the insulating plate 150. The lower end of the electrode terminal 131 is coupled to the terminal plate 160. The above-described positive electrode plate 113 and the negative electrode plate 115 each have a positive electrode tab 116 and a negative electrode tab 117 which are drawn to the upper portion of the electrode assembly 110, and the negative electrode plate 115 has a negative electrode tab 117 and a terminal. The electrode terminal 131 is electrically connected to the electrode terminal 131 through the plate 160, and the positive electrode tab 116 is welded to the cap plate 140 or the can 120. An insulating case 180 may be further installed below the terminal plate 160.

After the cap assembly 130 as described above is welded to the upper end of the can 120, the electrolyte is injected through the electrolyte inlet 145 of the cap plate 140, and the electrolyte inlet 145 is formed by injecting a ball. Sealed with a stopper 135.

On the other hand, in the secondary battery 100 according to an embodiment of the present invention, the positive electrode plate 113 and the negative electrode plate 115 are connected by the first temperature element 170. More specifically, the positive electrode tab 116 and the negative electrode tab 117 drawn out from the positive electrode plate 113 and the negative electrode plate 115 are connected by the first temperature device 170. The change rate of the resistance according to the change in temperature of the first temperature element 170 is formed to be zero or negative. That is, when the temperature increases, the self-resistance of the first temperature element 170 does not increase, but it is constant or decreases.

The first temperature device 170 is fixed on the insulating case 180 and both ends thereof are connected to the positive electrode tab 116 and the negative electrode tab 117 through the adhesive layer 171. At this time, the adhesive layer 171 is made of a conductive adhesive. The conductive adhesive may be any one selected from epoxy-based, modified urethane-based, silicone-based, acrylic-based and thermosetting resin films.

At this time, the first temperature element 170 is a non-conductor through which no current flows at room temperature, but the resistance decreases at a specific temperature to change into a conductor. That is, when the internal temperature of the secondary battery is formed at an excessive temperature, the first temperature device 170 electrically connects the positive electrode plate 113 and the negative electrode plate 115 to each other, and the secondary battery is momentarily discharged to recover to a stable state. .

In this case, the first temperature device 170 may be formed of a material including vanadium oxide (VO ₂ ). Vanadium oxide is suitable for application as a safety device of a secondary battery because the resistance is drastically reduced above a certain temperature.

On the other hand, the first temperature element 170 may be formed including an NTC (Negative Temperature Coeffcient) element. NTC devices are generally a composite of 2 to 4 kinds of transition metal oxides such as manganese, nickel, cobalt, iron, and copper, molded into the shape of the first temperature device 170, and then sintered at a high temperature of 1100 to 1400 ° C. Oxide semiconductor ceramics.

NTC element is formed with a negative change rate of the resistance according to the increase in temperature, when the above-described secondary battery is over temperature, the resistance value is sharply reduced to energize the positive electrode plate and the negative electrode plate. Thus, similar effects to those in the case of forming the first temperature element with a material containing vanadium oxide can be obtained.

As described above, the secondary battery according to an embodiment of the present invention includes a first temperature element connecting the positive electrode tab and the negative electrode tab so that the secondary battery is swollen or exploded by momentarily shorting the positive electrode plate and the negative electrode plate when the temperature rises excessively. Suppress it. Therefore, the safety of the secondary battery is significantly increased.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 3 is a partial cross-sectional view of the upper side of the secondary battery 200 according to another embodiment of the present invention.

In the present embodiment, the same reference numerals are assigned to the same elements as in the previous embodiment. Referring to FIG. 3, the secondary battery 200 according to another embodiment of the present invention has different structures of the secondary battery 100 and the first protection device 270 according to the above-described embodiment of the present invention.

That is, in this embodiment, the first temperature element 270 is formed outside the can 120. The positive electrode tab 116 is electrically connected to the cap plate 140, and the negative electrode tab 117 is electrically connected to the electrode terminal 131. The first temperature element 270 is the cap plate 140 and the electrode terminal. 131 is connected. In this case, the first temperature element 270 is bonded to a part of the upper surface of the cap plate 140 and a part of the upper surface of the electrode terminal 131, in this case can be bonded using the same conductive adhesive as in the above-described embodiment As illustrated in FIG. 3, a separate adhesive part 271 may be formed to allow the first temperature element 270 to contact the cap plate 140 and the electrode terminal 131. In this case, the adhesive part may be formed of a material including a ceramic having high heat resistance.

As described above, since the secondary battery 200 according to the present exemplary embodiment forms the first temperature element 270 on the outside of the can 120, the first temperature element 270 is formed between the positive electrode tab 116 and the negative electrode tab 117. ), It is easier to electrically connect the positive electrode plate 113 and the negative electrode plate 115 with each other.

That is, since the cap plate 140 and the electrode terminal 131 having a larger cross-sectional area than the positive electrode tab 116 and the negative electrode tab 117 are connected to the first temperature element 270, the yield in the manufacturing process is significantly increased, and the production time is increased. Can be further shortened. In addition, since the first temperature element can be easily bonded after the manufacture of the secondary battery cell is completed, the fabrication of the secondary battery is increased. In addition, since a separate adhesive part 271 is formed to connect the first temperature element 270 to the cap plate 140 and the electrode terminal 131, the stability of adhesion is further increased, and as a result, the safety of the secondary battery is further increased. .

Hereinafter, another embodiment of the present invention will be described. 4 is an exploded perspective view of a secondary battery according to still another embodiment of the present invention, and FIG. 5 is a partial cross-sectional view of an upper side of the secondary battery according to another embodiment of the present invention.

In the present embodiment, the same reference numerals are assigned to the same elements as the previous embodiments. 4 and 5, the secondary battery 300 according to another embodiment of the present invention is further provided with a second temperature element 310 in the secondary battery 100 according to the previous embodiment of the present invention described above. .

The second temperature element 310 is electrically connected to either the positive electrode plate 113 or the negative electrode plate 115. In the drawing, since it is connected to the electrode terminal 131 in the general rectangular secondary battery, it is connected to the negative electrode plate 115, but the present invention is not limited thereto. The second temperature element 310 blocks the flow of current by rapidly increasing the resistance above the preset temperature.

In this case, the second temperature device 310 may be formed of a positive temperature coefficient (PTC) device. The PTC device 310 is a device that adjusts the flow of current by increasing the resistance as the ambient temperature increases. The PTC device 310 may be a composite based on a resin such as styrene butadience rubber (SBR) and a composite material formed of carbon powder or an oxide based on barium titanate. In addition, the PTC device 310 may use a composite device that can minimize the thickness of the device, the composite device is produced by forming a carbon powder and a resin in a thin film between the upper plate and the lower plate. In the composite device, as the temperature increases, the resin expands and some contact between the carbon powder is cut off, thereby increasing internal resistance.

4 and 5, the PTC element 310 includes the connection tab portions 311 and 313 and the main body portion 312. At this time, the connecting tabs 311 and 313 are integrally formed at both ends of the main body 313. That is, the lower surface of the body portion 313 is insulated from the cap plate 140 by the insulating plate 320 while the upper end portion is formed with a connection tab portion 311 is connected to the protective circuit board 330, the body portion 312 A connection tab portion 313 connected to an upper surface of the negative electrode terminal 131 is formed on the other end upper surface. Here, when the main body 312 is above the set temperature (hereinafter referred to as a second temperature), the resistance increases rapidly to block the flow of current between the connection tab portions 311 and 313.

On the other hand, the secondary battery 300 according to another embodiment of the present invention operates the second temperature element 310 and the aforementioned first temperature element 170 in different temperature ranges. In other words, the first temperature at which the first temperature element 170 operates is greater than the second temperature at which the second temperature element 310 operates. That is, when the temperature of the secondary battery 300 increases and becomes over temperature, first, the self-resistance of the second temperature element 310 rapidly increases to block the current. Therefore, the rupture of the secondary battery 300 is preferentially prevented. However, when the temperature of the secondary battery 300 becomes larger than the second temperature, the risk of explosion of the secondary battery 300 increases due to swelling. At this time, the above-described first temperature element 170 operates to short-circuit the positive electrode plate 113 and the negative electrode plate 115 to cause an instant discharge. As described above, in the secondary battery 300 according to the present embodiment, the first temperature device 170 and the second temperature device 310 operate sequentially to significantly increase the stability of the secondary battery 300.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 6 is a cross-sectional view of a secondary battery according to still another embodiment of the present invention. Secondary battery according to another embodiment of the present invention is disclosed with respect to the cylindrical secondary battery, unlike the previous embodiment described above.

Referring to FIG. 6, the secondary battery 400 according to another embodiment of the present invention includes an electrode assembly 410, a cylindrical can 430 containing an electrode assembly 410 and an electrolyte, and an upper portion of the cylindrical can 430. It is formed to include a cap assembly 450 to seal the cylindrical can 430 and to flow a current generated in the electrode assembly 410 to an external device.

The electrode assembly 410 includes a positive electrode plate 411, a negative electrode plate 412, and a separator 413, and the positive electrode plate 411 is bonded to the positive electrode tab 415, which is drawn out to the upper portion of the electrode assembly 410, and the negative electrode plate ( 412 is bonded to the negative electrode tab 416, which is drawn out to the lower portion of the electrode assembly 410. In addition, upper and lower portions of the electrode assembly 410 may further include insulation plates 417 and 418 to prevent contact with the cap assembly 450 or the cylindrical can 430, respectively.

The cylindrical can 430 includes a cylindrical side plate 431 having a predetermined diameter and a bottom plate 432 sealing the lower portion of the cylindrical side plate 431 so that a predetermined space in which the electrode assembly 410 can be accommodated is formed. The upper side of the cylindrical side plate 431 is opened to insert the electrode assembly 410. The negative electrode tab 416 of the electrode assembly 410 is bonded to the center of the bottom plate 432 of the cylindrical can 430, so that the cylindrical can 430 itself serves as a negative electrode. In addition, the cylindrical can 430 is generally formed of aluminum (Al), iron (Fe) or an alloy thereof. In addition, the cylindrical can 430 is formed with a clipping portion 433 bent from the top to the inside to press the upper portion of the cap assembly 450 coupled to the upper opening. In addition, the cylindrical can 430 is beaded inwardly so as to press the lower portion of the cap assembly 450 at a position spaced apart from the creeping portion 433 by a distance corresponding to the thickness of the cap assembly 450. The portion 434 is further formed.

The cap assembly 450 includes a safety vent 451, a current blocking means 452, a second temperature element 458, and a cap up 459.

The safety vent 451 is formed in a disc shape by a conductive metal material and includes a protrusion 455 protruding downward in the center thereof, and is positioned below the cap assembly 450. The safety vent 451 may be formed of aluminum metal or nickel metal. The positive electrode tab 415 is electrically coupled to the lower portion of the safety vent 451 and is welded to the protrusion 455 to be coupled thereto. The protrusion 455 of the safety vent 451 is formed to protrude downward in a normal state, and when the pressure inside the secondary battery 400 increases due to overcharging or discharging of the secondary battery 400. The protrusion 455 is formed to be inverted in an upward direction.

The second temperature element 458 is formed in a ring shape having an outer diameter and a predetermined width corresponding to the outer diameter of the safety vent 451, is seated and coupled to the upper portion of the current blocking means 452, and the temperature of the secondary battery is increased. When increased, it blocks the flow of current. The second temperature element 458 may use a PTC element.

The cap up 459 is seated and coupled to an upper portion of the cap assembly 450, and energizes current generated from the secondary battery to the outside.

A current interrupting device (hereinafter referred to as “CID”) 452 is installed above the safety vent 451 and energizes the current flowing through the safety vent 451 to flow to the second temperature element 458. do. However, when the secondary battery 400 is abnormally operated and the internal pressure of the secondary battery 400 rises above the prescribed level, the protrusion 455 of the safety vent 451 is deformed upward, and the current blocking means 452 is deformed. It is broken by the protrusion 455 to block the flow of current. On the other hand, reference numeral 454, which is not described, shows a central hole of the current blocking means 452. Detailed configuration of the current blocking means can be easily carried out by those skilled in the art to which the present invention pertains to the detailed description thereof.

On the other hand, in the secondary battery 400 according to another embodiment of the present invention, the positive electrode tab 415 and the beading portion 434 of the cylindrical can 430 are connected by the first temperature element 470. The first temperature element 470 is adhesively fixed to the upper insulating plate 417 to energize the positive electrode tab 415 and the cylindrical can 430 at a predetermined temperature or more. Since the operation of the first temperature element 470 has been described in the previous embodiment, a detailed description thereof will be omitted.

As described above, the secondary battery 400 according to the present exemplary embodiment sequentially operates the second temperature element 458 and the first temperature element 470 as in the previous embodiment, thereby improving safety of the secondary battery 400. Can be significantly increased.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 7 is a cross-sectional view of a secondary battery according to still another embodiment of the present invention.

In the present embodiment, the same reference numerals are assigned to the same elements as the previous embodiments. Secondary battery 500 according to another embodiment of the present invention is formed differently from the first embodiment and the first temperature element 570.

That is, in this embodiment, the first temperature element 570 is formed to be exposed to the outside of the cylindrical can. At this time, the first temperature element 570 connects the cap-up 459 and the crimping portion 433. Therefore, the first temperature element 570 energizes the positive electrode plate 411 and the negative electrode plate 412 at a predetermined temperature or more. In this embodiment, since the first temperature device 570 is disposed outside the cylindrical can 430, the anode plate is disposed at a relatively wider portion than when the first temperature device 570 is disposed inside the cylindrical can 430. 411 and the negative electrode plate 412 are connected to the first temperature element 570. Therefore, the stability of the adhesion can be further increased, and as a result, the safety of the secondary battery 500 can be further increased.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 8 is an exploded perspective view of a secondary battery according to another exemplary embodiment of the present invention, and FIG. 9 is a cross-sectional view of a state in which the components of FIG. 8 are combined.

On the other hand, the secondary battery 600 according to another embodiment of the present invention discloses a pouch-type secondary battery, unlike the previous embodiment described above.

8 and 9, the secondary battery 600 according to another embodiment of the present invention includes a pouch 620 having an electrode assembly 610 and a receiving portion 621 in which the electrode assembly 610 is accommodated. It is formed to include.

The electrode assembly 610 is formed to include a positive electrode plate 611 and a negative electrode plate 612 and a separator 613 interposed therebetween, and the positive electrode plate 611 and the negative electrode plate 612 are each drawn out of the positive electrode tab 615. ) And a negative electrode tab 616. In addition, the positive electrode tab 611 and the negative electrode tab 612 are provided with the insulating tab 617 at a predetermined position to prevent a short circuit with the pouch 620 described later.

The pouch 620 folds the middle of the pouch 620 based on the length direction of one side of a generally rectangular film which is integrally formed to form the first case part 620a and the second case part 620b. In the center of the first case part 620a, a receiving part 621 in which the electrode assembly 610 is to be accommodated is formed by pressing or the like. The pouch 620 may be formed of a metal thin film including an aluminum thin film. In addition, an outer surface of the pouch 620 may be formed with an insulating layer including resin or nylon to prevent damage to the outer surface of the pouch 620 and to prevent the outer surface of the pouch 620 from being in electrical contact with the outside.

The first case part 620a and the second case part 620b seal the electrode assembly 610 sealed by the sealing parts 625 and 625 '.

Meanwhile, in the secondary battery 600 according to another embodiment of the present invention, the positive electrode tab 615 and the negative electrode tab 616 are connected by the first temperature element 630 described in the previous embodiment. In addition, either the positive electrode tab 615 or the negative electrode tab 616 is provided with a second temperature element 640. Therefore, even in the case of the pouch type secondary battery 600 which is vulnerable to the swelling phenomenon, the safety is significantly increased.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 10 is a cross-sectional view of a secondary battery 700 according to another embodiment of the present invention.

In the present embodiment, the same reference numerals are assigned to the same elements as in the previous embodiment. Referring to FIG. 10, in the secondary battery 700 according to another embodiment of the present invention, the structure of the secondary battery 100 and the first temperature device 730 according to the previous embodiment is formed differently.

That is, in the present embodiment, the first temperature element 730 is exposed to the outside of the pouch 620. Therefore, the space occupied area of the accommodation portion 621 formed in the pouch 620 can be increased. Therefore, not only the safety of the secondary battery 700 may be secured, but the capacity 700 of the secondary battery may be increased.

Hereinafter, a secondary battery according to another embodiment of the present invention will be described. 11 is a cross-sectional view of a secondary battery 800 according to another embodiment of the present invention.

In the present embodiment, the same reference numerals are assigned to the same elements as in the previous embodiment. Referring to FIG. 11, in the secondary battery 700 according to another embodiment of the present invention, structures of the secondary battery 100 and the first temperature device 830 according to the previous embodiment are formed differently.

That is, in the present embodiment, the first temperature element 830 is formed in the sealing portion 625. Therefore, it is not necessary to form a separate insulating tab for insulating the positive electrode tab 615 and the negative electrode tab 616 from the pouch 620, the first temperature element 830 itself performs the function of the insulating tab. Therefore, not only the safety and capacity increase of the secondary battery 800, but also the manufacturing process is reduced, thereby greatly improving the economics of the secondary battery 800.

What has been described above is only an embodiment for carrying out the secondary battery according to the present invention, the present invention is not limited to the above-described embodiment, without departing from the gist of the present invention as claimed in the following claims Anyone with ordinary knowledge in the field of the present invention corresponds to the technical idea of the present invention to the extent that various modifications can be made.

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

2 is a partial cross-sectional view of an upper side of a rechargeable battery according to an exemplary embodiment of the present invention.

3 is a partial cross-sectional view of an upper side of a secondary battery according to another exemplary embodiment of the present invention.

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

5 is a partial cross-sectional view of an upper side of a secondary battery according to still another embodiment of the present invention.

6 is a cross-sectional view of a secondary battery according to still another embodiment of the present invention.

7 is a cross-sectional view of a secondary battery according to still another embodiment of the present invention.

8 is an exploded perspective view of a secondary battery according to another embodiment of the present invention.

9 is a cross-sectional view of a state in which the components of FIG. 8 are combined.

10 is a cross-sectional view of a secondary battery according to another embodiment of the present invention.

11 is a cross-sectional view of a secondary battery according to another embodiment of the present invention.

Claims (20)

An electrode assembly comprising a positive plate, a negative plate and a separator, A can formed with an upper opening to accommodate the electrode assembly; A first temperature element connecting the positive electrode plate and the negative electrode plate Including, A secondary battery, characterized in that the rate of change of resistance to increase in temperature of the first temperature element is formed as zero or negative. The method of claim 1, The first temperature element is a secondary battery, characterized in that for energizing the positive electrode plate and the negative electrode plate above a predetermined first temperature. The method of claim 1, The first temperature element is a secondary battery, characterized in that formed by containing vanadium oxide. The method of claim 1, The first temperature element is a secondary battery comprising an NTC element. The method of claim 2, And a second temperature element electrically connected to any one of the positive electrode plate and the negative electrode plate, and blocking a flow of current at a preset second temperature or more. The method of claim 5, The first battery is characterized in that it is formed larger than the second temperature. The method of claim 5, The second temperature element is a secondary battery, characterized in that the PTC element. The method of claim 1, Each of the positive electrode plate and the negative electrode plate includes a positive electrode tab and a negative electrode tab drawn out to an upper portion of the electrode assembly, and the first temperature element connects the positive electrode tab and the negative electrode tab. The method of claim 1, Each of the positive electrode plate and the negative electrode plate includes a positive electrode tab and a negative electrode tab drawn out to an upper portion of the electrode assembly, A cap plate sealing the upper opening of the can and having a terminal through hole and an electrode terminal inserted into the terminal through hole; The positive electrode tab is connected to the cap plate, the negative electrode tab is connected to the electrode terminal, the first temperature element is a secondary battery characterized in that connecting the electrode terminal and the cap plate. The method of claim 1, Each of the positive electrode plate and the negative electrode plate includes a positive electrode tab and a negative electrode tab, the negative electrode tab is electrically connected to the can, and a first temperature element connects the positive electrode tab and the can. The method of claim 1, The positive electrode plate and the negative electrode plate is provided with a positive electrode tab and a negative electrode tab, respectively Further comprising a cap up electrically connected to the positive electrode tab, The first temperature element is a secondary battery, characterized in that for connecting the cap up and the can. An electrode assembly in which a first electrode plate and a second electrode plate are provided through a separator; A pouch having an accommodating portion for accommodating the electrode assembly and accommodating the electrode assembly while forming a sealing portion; A first temperature element connecting the first electrode plate and the second electrode plate Including, A secondary battery, characterized in that the rate of change of resistance to increase in temperature of the first temperature element is formed as zero or negative. The method of claim 12, The first temperature element is a secondary battery, characterized in that for energizing the first electrode plate and the second electrode plate above a predetermined first temperature. The method of claim 12, The first temperature element is a secondary battery, characterized in that formed by containing vanadium oxide. The method of claim 12, And a second temperature element electrically connected to any one of the first electrode plate and the second electrode plate, and configured to block the flow of current above a preset second temperature. The method of claim 15, The first battery is characterized in that it is formed larger than the second temperature. The method of claim 12, Each of the first electrode plate and the second electrode plate includes a first electrode tab and a second electrode tab, and the first electrode tab and the second electrode tab are exposed to the outside through the sealing portion of the pouch, The first protection device is a secondary battery, characterized in that for connecting the first electrode tab and the second electrode tab. The method of claim 17, The first protective element is a secondary battery, characterized in that provided in the sealing portion of the pouch. The method of claim 17, The first protective element is a secondary battery, characterized in that provided in the receiving portion of the pouch. The method of claim 17, The first protective element is a secondary battery, characterized in that provided on the outside of the pouch.

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