KR100865399B1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
KR100865399B1
KR100865399B1 KR1020070044277A KR20070044277A KR100865399B1 KR 100865399 B1 KR100865399 B1 KR 100865399B1 KR 1020070044277 A KR1020070044277 A KR 1020070044277A KR 20070044277 A KR20070044277 A KR 20070044277A KR 100865399 B1 KR100865399 B1 KR 100865399B1
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KR
South Korea
Prior art keywords
battery
case
electrode lead
pouch
terminal
Prior art date
Application number
KR1020070044277A
Other languages
Korean (ko)
Inventor
김중헌
박상목
Original Assignee
삼성에스디아이 주식회사
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Priority to KR1020070044277A priority Critical patent/KR100865399B1/en
Application granted granted Critical
Publication of KR100865399B1 publication Critical patent/KR100865399B1/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/34Current conducting connections for cells with provision for preventing undesired use or discharge, e.g. complete cut of current
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0202Cases, jackets or wrappings for small-sized cells or batteries, e.g. miniature battery or power cells, batteries or cells for portable equipment
    • H01M2/0207Flat-shaped cells or batteries of flat cells
    • H01M2/021Flat-shaped cells or batteries of flat cells with both terminals passing through the case or cover
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0267Cases, jackets or wrappings characterised by the material of wrappings, outside coatings, jackets around completely closed cell elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0275Cases, jackets or wrappings characterised by the material of flexible envelopes or bags around open cell elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0285Conductive material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0287Cases, jackets or wrappings characterised by the material comprising layers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00Safety devices for primary or secondary batteries
    • H01M2200/10Temperature sensitive devices
    • H01M2200/106PTC
    • Y02E60/12

Abstract

The present invention relates to a secondary battery, and more particularly, to a pouch-type secondary battery, each of which is disposed inside and outside of the outer case of the positive and negative electrode lead in the form of a pouch.
An outer case including a battery body capable of charging and discharging, a hollow type having a receiving space of the battery body, and having terminal portions exposed to the outside and the inside of the receiving space, respectively, and either the positive or negative polarity of the battery body. Is electrically connected to an external electrode lead, one side of which is exposed to the outside of the outer case, and the other of the positive and negative poles of the battery body, and one side of which is electrically connected to the terminal portion inside the outer case. It characterized in that it comprises an internal electrode lead connected to.

Description

Secondary Battery

1 is a configuration diagram showing a schematic configuration of a secondary battery according to the present invention

Figure 2 is a perspective view showing the configuration of a secondary battery according to an embodiment of the present invention

3 is a perspective view illustrating a state after the secondary battery is sealed according to the embodiment of FIG. 2;

4 is a cross-sectional view of a portion "A" in the secondary battery according to the embodiment of FIG.

5 is a cross-sectional view of a portion “B” in the secondary battery according to the embodiment of FIG. 2.

6 is a cross-sectional view taken along the line VI-VI of FIG. 3.

7 is a perspective view illustrating a state in which a protection circuit board is coupled to a secondary battery according to the embodiment of FIG. 2;

8 is a cross-sectional view of FIG.

9 is a configuration diagram showing a schematic configuration of another form of a secondary battery according to the present invention;

* Description of the symbols for the main parts of the drawings *

1: secondary battery 10: outer case

12: junction 14: terminal

20: battery body 30: external electrode lead

32: insulation 40: internal electrode lead

100: secondary battery 110: battery body

120: outer case 121: upper pouch film

121a: nylon layer 121b: aluminum layer

121c: resin layer 122: internal terminal hole

123: lower pouch film 123a: resin layer

123b: aluminum layer 123c: nylon layer

130: external electrode lead 132: insulation

140: internal electrode lead 142: bent portion

150: protection circuit board 151: printed circuit board

152: electronic device 153,154: connection terminal

155: Insulation Sheet

The present invention relates to a secondary battery, and more particularly, to a pouch-type secondary battery, each of which is disposed inside and outside of the outer case of the positive and negative electrode lead in the form of a pouch.

Generally, a secondary battery refers to a battery capable of charging and discharging, and is widely used in the field of small and high-tech electronic devices such as mobile phones, PDAs, and notebook computers. In particular, the lithium secondary battery has an operating voltage of 3.6 V, which is about three times higher than the operating voltage 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. It is an increasing trend.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. In addition, such lithium secondary batteries are manufactured in various shapes, and examples thereof include cylindrical shapes, square shapes, and pouch types.

The lithium secondary battery may be classified into a lithium ion battery using a liquid electrolyte and a lithium polymer battery using a polymer solid electrolyte according to the type of electrolyte. Lithium polymer batteries may be classified into a type using a solid polymer electrolyte containing no electrolyte solution and a gel polymer electrolyte containing electrolyte solution, depending on the type of polymer solid electrolyte.

In the case of a lithium ion battery using a liquid electrolyte, a cylindrical or rectangular metal can is usually used as a container, and an electrode assembly, an electrolyte solution, and various other components are embedded inside the can, and then the open side of the can is sealed. Is produced. That is, as described above, the rectangular or cylindrical secondary battery corresponds to the type of secondary batteries classified according to their shapes. Here, a relatively hard metal can is used in a lithium ion battery using a liquid electrolyte, so that hard metal cans have little risk of breakage, and thus, leakage of the electrolyte due to breakage of the metal can is prevented. One reason for this can be found.

However, in the case of a secondary battery using a cylindrical or rectangular metal can as a container, the shape of the secondary battery is determined by a hard metal can, which constrains the design of an electronic / electric product that is powered through the battery. have. In addition, the hard metal can is not only relatively thick, but also hardly deformable after being molded into a certain form, thus making it difficult to reduce the volume of the secondary battery.

Therefore, in recent years, a polymer solid electrolyte is interposed between a positive electrode and a negative electrode, and such a polymer solid electrolyte has an electrode assembly manufactured to function as a separator, and the electrode assembly is put into a thin pouch and sealed in a pouch. Type secondary batteries are widely used.

Referring to the configuration of the pouch-type secondary battery and the pouch used therein schematically, the pouch-type secondary battery comprises an electrode assembly and a pouch sealed to accommodate the electrode assembly.

The electrode assembly includes a plate-shaped anode and a cathode and a membrane of a polymer solid electrolyte interposed between the anode and the cathode. Here, the membrane of the polymer solid electrolyte enables the movement of lithium ions between the positive electrode and the negative electrode, in addition to the function of insulating the positive electrode and the negative electrode. In addition, electrode tabs are attached to the anode and the cathode, respectively.

The pouch includes a lower pouch film that forms a receiving space of the electrode assembly, and an upper pouch film that is coupled to all four sides of the lower pouch film. Here, the lower pouch film is usually formed into a shape having an accommodating space therein by a deep drawing process, and bonding between the four ends of the upper and lower pouch films is usually performed by a thermal bonding method. In addition, one end of each of the positive and negative electrode tabs of the electrode assembly is drawn out of the pouch, and the electrode tabs are insulated by an insulating tape or the like at the lead portion to the pouch.

However, in the conventional pouch type secondary battery as described above, since both positive and negative electrode tabs of the electrode assembly are drawn out of the pouch, the width of the two electrode tabs drawn in the same direction is considered in designing the secondary battery. The width of the secondary battery should be determined. In other words, when fabricating a narrow secondary battery, there is a high risk of a short circuit caused by contact between two electrode tabs drawn from the pouch. Accordingly, when the pouch-type secondary battery is manufactured in a narrow form, there is a big limitation in reducing the width of the pouch-type secondary battery in order to prevent short circuit between electrode tabs drawn out of the pouch.

The present invention is to solve the above problems, and since the positive and negative electrode leads in the form of tabs are disposed inside and outside of the outer case each having a pouch form, only an electrode lead of one polarity is formed in the outer case. It is an object of the present invention to provide a secondary battery that can reduce the overall width by being drawn outward.

In order to achieve the above object, the present invention is a battery body that can be charged and discharged, the outer case including a hollow form the receiving space of the battery body, the terminal portion exposed to the outside and the inside of the receiving space, and And an external electrode lead electrically connected to one of the positive and negative poles of the battery body, and an external electrode lead exposed at one side to the outside of the outer case, and the other polarity of the positive and negative poles of the battery body. In addition, one side provides a secondary battery comprising an inner electrode lead electrically connected to the terminal portion inside the outer case.

The outer case may be in the form of a pouch having a multilayer structure of different materials, and may include a conductive layer made of a conductive material to form the terminal portion.

The outer case may include a top and bottom pouch layer having a multilayer structure including a thermal bonding layer and a conductive layer, wherein the thermal bonding layer is positioned on each of the upper and lower end surfaces of the upper and lower pouch layers facing each other. An inner terminal hole exposing the conductive layer may be formed in the bonding layer. Herein, the inner terminal hole may be formed in the thermal bonding layer of any one of the upper and lower pouch layers, or in the thermal bonding layers of the two pouch layers. The upper and lower pouch layers may be formed in portions of the upper and lower pouch layers that are thermally bonded to each other, and one side of the inner electrode leads may be connected to the conductive layer through the inner terminal holes. The inner electrode lead may include a bent portion that is bent in a direction parallel to the circumference of the upper and lower pouch layers, and the bent portion is connected to the conductive layer through the inner terminal hole. It may be thermally bonded together with the upper and lower pouch film. The bent portion may be bent in a direction in which a gap with the external electrode lead is opened.

The inner electrode lead and the outer electrode lead may have a tabbed tab structure, and the inner and outer electrode leads of the tab structure may be connected by welding to the terminal portion of the pouch.

The inner and outer electrode leads, one or both may be made of nickel or nickel alloy.

The inner and outer electrode leads may extend in the same direction with respect to the battery body, or extend in opposite directions with respect to the battery body.

In addition, the secondary battery of the present invention, the protection circuit for the battery body is formed, and further comprising a protective circuit board is provided with a positive and negative connection terminal connected to the terminal portion of the outer case and the external electrode lead, respectively. It may be. Here, any one of the positive and negative connection terminals and the external electrode lead may be connected via a secondary protection element, the secondary protection element may be a PTC element. In addition, the outer case accommodating the battery body may have a multi-layer structure including a conductive layer, and an outer terminal hole through which the conductive layer is exposed may be formed on an outer surface of the outer case. The protective circuit board may have one surface thereof in contact with a surface of the outer case, and the outer terminal hole may be formed at a position at which one connection terminal of the protective circuit board is in contact with the outer case surface.

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

1 is a configuration diagram showing a schematic configuration of a secondary battery according to the present invention. And, Figure 2 is a perspective view showing the configuration of a secondary battery according to an embodiment of the present invention, Figure 3 is a perspective view showing a state after being sealed of the secondary battery according to the embodiment of FIG. 4 is a cross-sectional view of a portion “A” of the secondary battery according to the embodiment of FIG. 2, and FIG. 5 is a cross-sectional view of a portion “B” of the secondary battery according to the embodiment of FIG. 2. 6 is a cross-sectional view taken along line VI-VI of FIG. 3, and FIG. 7 is a perspective view illustrating a state in which a protective circuit board is coupled to a secondary battery according to the embodiment of FIG. 2, and FIG. 8 is a cross-sectional view of FIG. 7.

As shown in FIG. 1, the secondary battery 1 according to the present invention includes a battery body 20, an outer case 10 in which the battery body 20 is accommodated, and one end of the battery body 20. It includes the inner and outer electrode leads 30, 40 disposed in the inner and outer portions of the outer case 10 in a state. The outer case 10 is a hollow structure in which the joints 12 are formed around the four sides, and the battery body 20 is accommodated in the accommodation space of the outer case 10. In addition, a terminal portion 14 is provided inside the outer case 10, and one side of the inner electrode lead 40 is connected to the terminal portion 4. In addition, the outer electrode lead 30 is formed with an insulating portion 32 for insulating the outer case 10 in the lead portion to the outer case 10.

One embodiment of such a secondary battery according to the present invention will be described with reference to FIGS. 2 to 8.

As described above, the secondary battery 100 according to an embodiment of the present invention includes a battery body 110, an outer case 120, and inner and outer electrode leads 130 and 140.

The battery body 110 is capable of charging and discharging, such a battery body 110 may be formed in various forms. In this embodiment, such a battery body 110 is in the form of a jelly-roll (jelly-roll) that is widely used in conventional pouch-type secondary batteries. Referring to FIG. 2, the battery body 110 includes a positive electrode plate and a negative electrode plate and a separator interposed between these two electrode plates, and the two electrode plates and the separator are wound to form a roll.

Although not shown in detail in the drawings, the negative electrode plate generally includes a negative electrode current collector made of a metal material and a negative electrode active material layer coated on one or both surfaces of the negative electrode current collector. In addition, the positive electrode plate also includes a positive electrode current collector usually made of a metal material, and a positive electrode active material layer coated on one or both surfaces of the positive electrode current collector.

The negative electrode non-coating portion of the negative electrode plate of which the negative electrode active material layer is not coated is formed on the negative electrode current collector of the negative electrode plate, and the positive electrode non-coating portion of the positive electrode active material of the positive electrode plate of the negative electrode plate of the negative electrode plate is formed. Such a positive and negative electrode non-coating portion may be formed only at one end of the positive electrode plate or the negative electrode plate, or may be formed at both ends of the positive electrode plate or the negative electrode plate.

In addition, as the electrode leads are respectively coupled to the negative electrode plate and the positive electrode plate, such electrode leads may be formed in a pair and attached to each of the negative electrode plate and the positive electrode plate. In addition, the electrode leads may be formed in one or more pairs and attached to the negative electrode plate and the positive electrode plate in plurality. In this embodiment, a pair of electrode leads 130 and 140 are attached to the positive electrode plate and the negative electrode plate, respectively.

The pair of electrode leads 130 and 140 is divided into an inner electrode lead 140 and an outer electrode lead 130 based on the hollow outer case 120 and the receiving space of the outer case 120. Lose. That is, one electrode lead 130 of one of the two electrode leads 130, 140 is drawn out of the other end to the outside of the outer case 120 in the state that one end thereof is connected to the uncoated portion of the positive electrode plate or negative electrode plate (130). In addition, the other electrode lead 140 is connected to the inner surface of the outer case 120 while the other end thereof is connected to the uncoated portion of the positive electrode plate or the negative electrode plate to become the inner electrode lead 140.

Here, the connection between the two electrode plates 130 and 140 of the two pole plates and the outer case 120 is made by welding, and thus the two electrode leads 130 and 140 are nickel having favorable properties for welding. It is preferable that it consists of a nickel alloy. In addition, each of the two electrode leads 130 and 140 has a tab-shaped tab structure, and the electrode leads 130 and 140 having the tab structure have two electrode plates or outer ends at one end or both ends thereof. It may be connected to 120 through welding.

In addition, a part or the whole of the battery body 110 and the inner and outer electrode leads 130 and 140 are accommodated in the accommodation space of the hollow outer case 120, and the outer case 120 has a multilayer structure. Is made in the form of a pouch. Here, the outer case 120 having a multilayer structure includes a conductive layer, and the conductive layer forms a terminal part connected to the inner electrode lead 140.

The outer case 120 will be described with reference to FIGS. 2, 4, and 5, and the outer case 120 includes an upper pouch layer 121 and a lower pouch layer 123. The upper and lower pouch membranes 121 and 123 of the outer case 120 are coupled to all four ends thereof, and thus the outer case 120 is disposed between the upper and lower pouch membranes 121 and 123. It has an accommodation space. Here, the upper and lower pouch membranes 121 and 123 may be coupled in a form in which all four ends thereof seal an inner receiving space, but the present invention is not limited thereto.

In addition, a conductive conductive layer is provided on either the upper pouch film 121 or the lower pouch film 123, or both the upper and lower pouch films 121 and 123, and the internal electrode lead is formed on the conductive layer. 140 is connected. At this time, the conductive layer is preferably made of a kind excellent in conductivity among the metals.

4 and 5, the upper and lower pouch layers 121 and 123 may be formed of thermal bonding layers 121c and 123a facing each other, and the upper and lower pouch layers 121 may be formed. Since the thermal bonding layers 121c and 123a of 123 are thermally bonded to each other, the outer case 120 may form a sealed accommodation space between the upper and lower pouch layers 121 and 123. Here, one end of the inner electrode lead 140 is disposed in the portion of the thermal bonding layers 121c and 123a of the upper and lower pouch layers 121 and 123 that are actually thermally bonded, and thus the upper and lower portions thereof. When the pouch layers 121 and 123 are thermally bonded, one end of the inner electrode leads 140 may be thermally bonded together so that the inner electrode leads 140 may be connected to the inside of the outer case 120. At this time, the terminal portion is disposed in the thermal bonding layer which is actually thermally bonded together with one end of the internal electrode lead 140 among the thermal bonding layers 121c and 123a of the upper and lower pouch layers 121 and 123.

2 and 3, the inner electrode lead 140 extends from the battery body 110 in a form having a bent portion 142, and the bent portion 142 is parallel to the circumference of the outer case 120. Is bent in the direction. The bent portion 142 is disposed between the thermal bonding layers 121c and 123a of the upper and lower pouch membranes 121 and 123 to thermally bond the upper and lower pouch layers 121 and 123. Thermally bonded together. Here, the bending direction of the bent portion 142 is bent in a direction away from the outer electrode lead 130 with respect to the outer electrode lead 130, accordingly the inner electrode lead 140 and the outer electrode lead 130 It is preferable that the short circuit risk due to the contact of.

In addition, when the overall structure of the outer case according to the present embodiment will be described in more detail with reference to FIGS. 2 and 4 and 5, as shown, the outer case 120 is the upper and lower pouch film 121 ( 123 is composed of a three-layer structure of a polyolefin resin layer (Polyolepin Layer (121c, 123a), an aluminum layer (AL / Aluminum Layer: 121b, 123b), nylon layer (Nylon Layer: 121a, 123c)). That is, the polyolefin resin layers 121c and 123a have a heat adhesiveness and serve as a sealing material, and the aluminum layers 121b and 123b are formed of a base material that maintains the mechanical strength of the outer case 120, and moisture and oxygen. It serves as a barrier layer, and the nylon layers 121a and 123c serve as substrates and protective layers. In addition, CPP (Casted Polypropylene) is commonly used as the polyolefin resin layers 121c and 123a.

Here, the outer case 130 is provided with inner and outer terminal holes 122 and 124, and through the inner and outer terminal holes 122 and 124, an aluminum layer that is a conductive layer of the outer case 130 ( 121b) and 123b are exposed to the inside and the outside of the outer case 130, respectively, and a part of the aluminum layers 121b and 123b exposed through the inner and outer terminal holes 122 and 124 is connected to the terminal portion. It may be working. That is, the aluminum layer 121b exposed to the inside of the outer case 120 forms an inner terminal portion, and the inner electrode lead 140 is connected to the terminal portion formed through the partial exposure of the aluminum layer 121b. In addition, the aluminum layer 123b exposed to the outside of the outer case 120 forms an external terminal portion, and any connection terminal 154 of the protective circuit board 150 described later is connected to the external terminal portion. In addition, the inner terminal hole 122 of the outer case 120 is formed in the thermal bonding layer of any one of the upper and lower pouch films 121 and 123, or formed in the thermal bonding layer of the two pouch films, respectively. Can be.

As mentioned above, the pouch type secondary battery according to the exemplary embodiment of the present invention may further include a protection circuit board.

Referring to FIGS. 7 and 8, the protective circuit board 150 forms a protective circuit for the battery body 110, and the protective circuit board 150 is a printed circuit board (PCB). 151) is formed in the form of a number of electronic elements 152 are mounted. The positive and negative connection terminals 153 and 154 are provided on the printed circuit board 151, and the positive and negative connection terminals 153 and 154 are connected to the positive and negative electrodes of the battery body 110. Electrically connected. At this time, any one of the positive and negative connection terminals 153 and 154 of the protective circuit board 150 is connected to the external electrode lead 130, and the other of the protective circuit board 150 The connection terminal 154 is connected to a terminal located outside the outer case 120.

Accordingly, any one of the positive and negative connection terminals 153 and 154 of the protective circuit board 150 may be connected to the inside of the outer case 120 through a terminal portion located outside the outer case 120. Electrical connection is made with the internal electrode lead 140. The positive and negative connection terminals 153 and 154 of the protective circuit board 150 and the external electrode lead 130 and the external terminal portion are connected by welding.

In addition, the electrical connection between the positive electrode or the negative electrode of the battery body 110 and the positive electrode terminal or the negative electrode terminal 153, 154 of the protective circuit board 150 is preferably made through a secondary protection device (not shown). . The secondary protection device refers to a device having a function of blocking an internal circuit of a battery when an overcharge / discharge of a bare cell or a short circuit occurs. In this embodiment, a positive temperature coefficient (PTC) element is used as the secondary protection element. Briefly, the PTC element functions as a conductor at room temperature, and when the ambient temperature rises, the electrical resistance increases in proportion to the elevated temperature to act as a non-conductor.

Here, the secondary protection device may sufficiently perform the protection function for the secondary battery 100 by only being installed in any one of the positive and negative connection lines of the battery body 110 and the protection circuit board 150. . Accordingly, in the present exemplary embodiment, the secondary protection element is connected between the external electrode lead 130 and the protection terminal between the external electrode lead 130 and the connection terminal 153 of the protection circuit board 150 connected to the external electrode lead 130. The connection terminal 153 of the substrate 150 is connected.

According to the above configuration, since only one electrode lead of one polarity of the positive and negative electrode leads of the secondary battery 100 is drawn out of the outer case, both the electrode leads of the positive and negative electrodes are placed outside the outer case 120. The risk of a short circuit due to being drawn out is prevented, and the width of the battery can be maximized since only the electrode lead of one polarity is drawn out of the outer case 120.

Meanwhile, in the above-described embodiment of FIGS. 2 to 8, the inner and outer electrode leads 130 and 140 are drawn out from the battery body 110 in the same direction, respectively. It may be a shape that is drawn in a direction opposite to each other with respect to. Referring to FIG. 9, the inner and outer electrode leads 230 and 240 of the secondary battery 200 are drawn out from the battery body 220 in a direction upwards from each other. Accordingly, the outer electrode lead 230 may be an outer case ( The outer electrode lead 240 is drawn out of the 220, and the inner electrode lead 240 is connected to the terminal portion 214 located inside the outer case 220 in a direction opposite to the outer electrode lead 230.

Reference numerals 220 and 212 denote the junction between the outer case and the circumference thereof, and 232 denotes the insulation between the outer electrode lead and the outer case.

On the other hand, according to another embodiment of the present invention, the outer case for accommodating the battery body is formed with a hole in the sealing portion, the electrode lead of any one of the first electrode lead or the second electrode lead through the hole of the outer case. May be a configuration that reveals one side. In other words, one side of the first electrode lead and the second electrode lead is connected to the positive and negative electrodes of the battery body, respectively, and one of the electrode leads among the first and second electrode leads is placed outside the outer case. The electrode lead is drawn out and the other one of the electrode leads is sealed together with the sealing part of the outer case, where a part of the electrode lead is exposed to the outside through the hole of the sealing part.

In addition, in order to prevent the sealing from being weakened around the entire polar lead that is exposed to the outside of the outer case through the hole of the sealing part, a sealing material such as a tape having a removal part at the portion corresponding to the hole may be supplemented.

As can be seen through the above-described embodiments, since the secondary battery according to the present invention, the positive and negative electrode leads, which are usually in the form of tabs, are disposed inside and outside of the outer case in the form of pouches, The risk of short circuit that can occur between the electrode tabs of the negative electrode is significantly reduced, and only the electrode lead of either polarity is drawn out of the outer case, thereby making it possible to greatly reduce the overall width of the secondary battery.

Claims (18)

  1. A battery body capable of charging and discharging;
    An outer case having a hollow form and formed an accommodating space of the battery body, the outer case including a terminal portion exposed to an outer side and an inner side of the accommodating space;
    An external electrode lead electrically connected to one of positive and negative polarities of the battery body, and having one side exposed to the outside of the outer case;
    An internal electrode lead electrically connected to the other polarity of the positive and negative electrodes of the battery body, and one side of which is electrically connected to the terminal portion inside the outer case;
    The outer case,
    A secondary battery having a pouch form having a multi-layered structure having different materials and including a conductive layer made of a conductive material to form the terminal portion.
  2. delete
  3. The method of claim 1, wherein the outer case,
    And a top and bottom pouch layer having a multi-layer structure including a thermal bonding layer and a conductive layer, wherein the thermal bonding layer is positioned on the end surfaces of the upper and lower pouch layers facing each other, and the conductive layer is disposed on the thermal bonding layer. Secondary battery, characterized in that the inner terminal hole is exposed.
  4. The method of claim 3, wherein the inner terminal hole,
    The secondary battery, characterized in that formed in the thermal bonding layer of any one of the upper and lower pouch film, or the thermal bonding layer of the two pouch films.
  5. The method of claim 3, wherein
    The inner terminal hole is formed in a portion where the upper and lower pouch layers are thermally bonded to each other, and the one side of the inner electrode lead is connected to the conductive layer through the inner terminal hole, and the column is formed together with the upper and lower pouch layers. Secondary battery, characterized in that bonded.
  6. The method of claim 5, wherein
    The inner electrode lead includes a bent portion that is bent in a direction parallel to the circumference of the upper and lower pouch layers, and is thermally bonded together with the upper and lower pouch layers while the bent portion is connected to the conductive layer through the inner terminal hole. Secondary battery characterized in that the.
  7. The method of claim 6, wherein the bent portion,
    Secondary battery, characterized in that the bent in the direction in which the gap with the external electrode lead.
  8. The method of claim 1,
    And the inner electrode lead and the outer electrode lead are formed in a tabbed tab structure, and the inner and outer electrode leads of the tab structure are connected to the terminal portions of the pouch by welding.
  9. The method of claim 1, wherein the inner and outer electrode leads,
    Secondary battery, characterized in that any one or both made of nickel or nickel alloy.
  10. The method of claim 1, wherein the inner and outer electrode leads,
    Secondary batteries, characterized in that extending in the same direction with respect to the battery body, respectively.
  11. The method of claim 1, wherein the inner and outer electrode leads,
    Secondary batteries, characterized in that extending in the opposite direction with respect to the battery body, respectively.
  12. The method of claim 1,
    And a protective circuit board having a protection circuit for the battery body and having positive and negative connection terminals connected to the terminal portion of the outer case and the external electrode lead, respectively.
  13. The method of claim 12,
    A secondary battery, wherein any one of the positive and negative connection terminals and the external electrode lead are connected via a secondary protective element.
  14. The method of claim 13,
    The secondary protective element is a secondary battery, characterized in that the PTC element.
  15. The method of claim 12,
    The outer case accommodating the battery body is made of a multi-layer structure including a conductive layer, the secondary battery characterized in that the outer terminal hole is formed on the outer surface of the outer case to expose the conductive layer.
  16. The method of claim 15,
    The protective circuit board may have one surface thereof in contact with a surface of the outer case, and the outer terminal hole may be formed at a position at which one connection terminal of the protective circuit board is in contact with the outer case surface.
  17. A battery body capable of charging and discharging;
    An outer case having a hollow shape in which an accommodating space of the battery body is formed and a hole formed in a part of a sealing part;
    A first electrode lead electrically connected to either of the positive and negative polarities of the battery body, and having one side exposed to the outside of the outer case;
    And a second electrode lead electrically connected to the other polarity of the positive and negative electrodes of the battery body, and having one side exposed to the outside through the hole of the outer case.
  18. The method of claim 17,
    Sealing material is coupled to the sealing portion of the hole and the periphery of the hole of the outer case, the sealing material, characterized in that the secondary battery having a removal portion in a position corresponding to the hole.
KR1020070044277A 2007-05-07 2007-05-07 Secondary battery KR100865399B1 (en)

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WO2013065962A1 (en) * 2011-10-31 2013-05-10 Sk Innovation Co.,Ltd. Battery cell, manufacturing method thereof, and battery module including the same
WO2018070660A1 (en) * 2016-10-14 2018-04-19 주식회사 엘지화학 Secondary battery comprising electrode lead and method for manufacturing secondary battery
US10079373B2 (en) 2013-05-21 2018-09-18 Lg Chem, Ltd. Pouch type secondary battery and method of manufacturing the same
KR20200039330A (en) 2018-10-05 2020-04-16 에스케이이노베이션 주식회사 Secondary battery

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KR20030081940A (en) * 2002-04-15 2003-10-22 삼성에스디아이 주식회사 Cap assembly and secondary battery therewith
KR20060028180A (en) * 2004-09-24 2006-03-29 삼성에스디아이 주식회사 Li secondary battery and method of fabricating the same
JP2006093101A (en) * 2004-09-24 2006-04-06 Samsung Sdi Co Ltd Lithium polymer battery with strength reinforcement layer and its manufacturing method

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KR20030032562A (en) * 2001-10-18 2003-04-26 삼성에스디아이 주식회사 Secondary battery mounting thermal protector
KR20030081940A (en) * 2002-04-15 2003-10-22 삼성에스디아이 주식회사 Cap assembly and secondary battery therewith
KR20060028180A (en) * 2004-09-24 2006-03-29 삼성에스디아이 주식회사 Li secondary battery and method of fabricating the same
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013065962A1 (en) * 2011-10-31 2013-05-10 Sk Innovation Co.,Ltd. Battery cell, manufacturing method thereof, and battery module including the same
US10079373B2 (en) 2013-05-21 2018-09-18 Lg Chem, Ltd. Pouch type secondary battery and method of manufacturing the same
US10586956B2 (en) 2013-05-21 2020-03-10 Lg Chem, Ltd. Pouch type secondary battery and method of manufacturing the same
WO2018070660A1 (en) * 2016-10-14 2018-04-19 주식회사 엘지화학 Secondary battery comprising electrode lead and method for manufacturing secondary battery
KR20200039330A (en) 2018-10-05 2020-04-16 에스케이이노베이션 주식회사 Secondary battery

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