KR20140012601A - Secondary battery and electrochemical cell having the same - Google Patents

Abstract

The present invention is to a secondary battery of an integration structure in the front surface of an electrode read bonded to a pouch case by the injection molding of an insulating film. To improve the reliability of the structure of a lead array for extending an electrode, the secondary battery includes an electrode lead tap extended from electrode assembly, a pouch case receiving the electrode assembly, and an insulating film formed on the contact surface of the pouch case and the electrode lead tap to obtain insulation between the electrode lead tap and the pouch case.

Description

Secondary battery and electrochemical device including the same {SECONDARY BATTERY AND ELECTROCHEMICAL CELL HAVING THE SAME}

The present invention relates to a secondary battery having improved safety and reliability, and more particularly, to a secondary battery including an integrated electrode lead having a highly insulating lead film and an electrochemical device including the same.

With the rapid development of the electronics, telecommunications, and computer industries, the rapid development of camcorders, mobile phones, laptops, and the like, the demand for lithium secondary batteries as a power source capable of driving these portable electronic communication devices is increasing day by day.

As technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries capable of meeting various demands have been conducted.

Representatively, there is a high demand for rectangular secondary batteries and pouch secondary batteries, which can be applied to products such as mobile phones with a thin thickness in terms of shape of batteries, and lithium ion batteries with high energy density, discharge voltage, and output stability in terms of materials. There is a high demand for lithium secondary batteries such as lithium ion polymer batteries.

FIG. 1 schematically shows a general structure of a typical conventional pouch-type secondary battery as an exploded perspective view.

Referring to FIG. 1, the pouch type secondary battery 100 may include an electrode assembly 300, electrode tabs 310 and 320 extending from the electrode assembly 300, and electrodes welded to the electrode tabs 310 and 320. And a battery case 200 accommodating the leads 410 and 420 and the electrode assembly 300.

In this case, the electrode assembly 300 is a power generator in which a positive electrode and a negative electrode are sequentially stacked in a state where a separator is interposed therebetween, and has a stack type or a stack / fold type structure.

In addition, the electrode tabs 310 and 320 extend from each electrode plate of the electrode assembly 300, and the electrode leads 410 and 420 are welded with a plurality of electrode tabs 310 and 320 extending from each electrode plate. Each is electrically connected, and part of the battery case 200 is exposed to the outside. The plurality of positive electrode tabs 310 and the plurality of negative electrode tabs 320 may be coupled together to the electrode leads 410 and 420 so that an upper end of the battery case 200 is spaced apart from the electrode assembly 300 at predetermined intervals. have.

The case 200 is made of an aluminum laminate sheet, provides a space for accommodating the electrode assembly 300, and has a pouch shape as a whole.

In addition, an insulating film 430 is attached to a portion of the upper and lower surfaces of the electrode leads 410 and 420, which are made of metal, in order to increase the sealing degree with the battery case 200 and to secure an electrical insulating state. That is, the insulating film is formed by disposing the upper insulating film F1 and the lower insulating film F2 on the upper and lower surfaces of the electrode lead (a) and then compressing them (see FIG. 2).

However, since the film material is simultaneously supplied from the upper and lower portions of the electrode lead during the film placement and the pressing process, a mismatch between the films occurs, which causes the film to be missing after the pressing. Occurs. Furthermore, looking at the cross-section X-X 'of FIG. 2 (b), when the films are compressed between the films, voids A are generated at the interface of the electrode lead, which is a metal material, resulting in poor adhesion efficiency or pin holes. Problems such as failures occur (b, c).

Republic of Korea Patent Publication No. 10-1068618

The present invention has been made in order to solve the above problems, an object of the present invention is to implement the insulating film of the integral structure through the injection molding process on the surface of the lead portion, as well as the alignment of the upper and lower film material, as well as the interface of the electrode lead The present invention provides a reliable secondary battery by removing voids or pinhole defects in the phase.

As a means for solving the above-described problems, the present invention allows the integrated structure of the electrode lead and the insulating film to be implemented by an injection method rather than a compression method.

That is, in the present invention

An electrode assembly in which a cathode and an anode are wound with a separator interposed therebetween,

An electrode lead tab extending from the electrode assembly,

Pouch packaging material for receiving the electrode assembly,

Insulation film formed on the contact surface of the electrode lead tab and the pouch case, for insulation between the electrode lead tab and the pouch case,

The insulating film provides a secondary battery that is integrally formed in close contact with the entire surface of an electrode lead part bonded to the pouch case through injection molding.

According to the present invention, by implementing an integrated electrode lead structure having an insulating film on the surface through an injection molding process, it is possible to reliably eliminate not only the alignment defects of the upper and lower film materials, but also the occurrence of voids and pinhole defects on the interface of the electrode leads. A secondary battery can be manufactured.

1 is a perspective view illustrating a general structure of a secondary battery.
2 is a process conceptual diagram showing a conventional lead assay manufacturing process and problems.
3 and 4 are cross-sectional conceptual views showing the structure of the lead assay according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same reference numerals denote the same elements regardless of the reference numerals, and redundant description thereof will be omitted. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Specifically, in the present invention,

An electrode assembly in which a cathode and an anode are wound with a separator interposed therebetween,

An electrode lead tab extending from the electrode assembly,

Pouch packaging material for receiving the electrode assembly,

Insulation film formed on the contact surface of the electrode lead tab and the pouch case, for insulation between the electrode lead tab and the pouch case,

The insulating film provides a secondary battery that is integrally formed in close contact with the entire surface of an electrode lead part bonded to the pouch case through injection molding.

3 (a) to 3 (c) illustrate a manufacturing process of an integrated electrode lead structure (hereinafter, referred to as a “lead assay”) having an insulating film according to the present invention.

In the lead assay according to the present invention, the electrode lead 410 is disposed in the injection mold G, the insulating material for forming the insulating film is supplied into the injection mold in a liquid form, and then cured. A structure of an integrated electrode lead 410 made of metal having an insulating film 430 may be implemented (a).

The lead assay of the present invention manufactured in this manner is composed of the electrode lead 410 and the insulating film 430 integrally, so that no gap is generated between the electrode lead 410 and the insulating film 430. Can be.

In addition, as shown in (b) and (c) of FIG. 3, the shape of the lead assay may freely modify the shape of the injection mold to implement various types of insulating films.

In this case, the insulating film may be independently attached to the electrode leads of each positive or negative electrode, or may be simultaneously attached to the two electrode leads as one unit.

In addition, the width of the insulating film is preferably equal to or slightly smaller than the width of the electrode lead welded portion bonded to the pouch case. In addition, the thickness of the insulating film is preferably formed to a thickness of about 10 to 150㎛ in terms of preventing damage to the pouch and tab when forming the battery.

The insulating film is not particularly limited as long as it does not affect the operation of the battery as an electrically insulating material. For example, the same material as the polymer material used in the laminate sheet may be used, and specifically, may be implemented as a thermosetting resin. . Specifically, the thermosetting resin is not particularly limited as long as it is a conventional resin used in secondary battery manufacturing, and is formed of at least one thermosetting resin selected from the group consisting of melanin resin, phenol resin, urea resin, epoxy resin, and polyurethane. Can be.

As described above, looking at the cross-section (X-X ') of Figure 3 (b), in the present invention by implementing the structure of the lead assay having an insulating film on the surface of the electrode lead through injection molding, It prevents the generation of voids on the interface of the electrode lead generated during the crimping process, removes pinhole defects, and eliminates the alignment defects of the upper and lower film materials to realize a reliable product. In particular, when the insulating film is made of a thermosetting resin as in the present invention, even if heat is applied to the electrode leads, no problem such as melting of the insulating film occurs, so it is firmly supported to increase the sealing degree of the secondary battery and at the same time, the electrical insulating state. Since it is possible to secure, it is possible to improve the safety of the battery.

4 illustrates another embodiment of a read assay formed in accordance with the present invention.

That is, the lead assay according to the present invention may implement a structure of various types of insulating films in a multilayer structure through a method of applying the injection mold described in FIG. 3 in order to increase the adhesion and sealing effect.

That is, as shown in Figs. 4 (a) and 4 (b), the insulating film according to the present invention is directly in contact with one or more surfaces of the electrode lead, for example, on one side, both surfaces, or the front surface. The first insulating layer 440 may be formed of a second insulating layer 430 formed of an insulating material that is directly stacked on the first insulating layer.

 At this time, any one of the first insulating layer or the second insulating layer may be implemented as a thermosetting layer made of a thermosetting resin. For example, the first insulating layer 440 in direct contact with the electrode lead may be implemented using a lead film material such as polypropylene resin (PP), and the second insulating layer 430 may be implemented with a thermosetting resin.

That is, a general resin such as PP, which is used as an insulating film of an electrode lead, is excellent in the adhesive effect between the exterior sheets of the battery case, but has a property that is vulnerable to heat. On the other hand, the position in which the insulating film according to the present invention is disposed as the upper and lower cases and the battery case 200 in Figure 1 is heat-sealed to accommodate the electrode assembly, high heat or pressure is applied. Therefore, when heat is applied to this site, the PP film used as the insulating film is melted to degrade adhesiveness, and moisture penetrates into this site, thereby causing battery safety problems.

Accordingly, when the thermosetting layer is included on at least one surface of the insulating film as in the present invention, even if heat is applied to the electrode lead, the thermosetting layer is mainly formed from the thermosetting polymer and is transferred to the lower second insulating layer to insulate the insulating film. This problem such as melting does not occur, and the second insulating layer is firmly supported to maintain electrical insulation, thereby improving battery safety.

Alternatively, the first insulating layer 440 may be implemented with a thermosetting resin, and in this case, the above-described effects may be realized.

In the case of the insulating film of the multilayer structure including the above-mentioned thermosetting layer, it is possible to suppress breakdown of the insulation resistance and to improve the possibility of water penetration, thereby improving battery safety and battery life.

The thermosetting layer may be formed of at least one thermosetting resin selected from the group consisting of melanin resin, phenol resin, urea resin, epoxy resin, and polyurethane. The thermosetting layer is preferably formed to a thickness of 10 to 150㎛ in terms of preventing damage to the pouch and tab when forming the battery.

The lead assay according to the present invention may be applied to the secondary battery described above with reference to FIG. 1, and is bound through electrode tabs and ultrasonic welding of the electrode assembly of FIG. 1, and insulates an insulating film at the boundary of the pouch, which is a battery case. The structure allows the use of lead assays.

In this case, the secondary battery to which the lead assay according to the present invention is applied may be configured as any one of the electrode assembly and the secondary battery having a structure of any one of a winding type, a stack type, and a stack / fold type structure.

In addition, the electrode assembly of the present invention is composed of a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, the components constituting them typically have the following specific materials and structural features.

(Anode structure)

In the present invention, the electrode formed on the base unit is divided into a positive electrode or a negative electrode, and the positive electrode and the negative electrode are prepared by mutually bonding with a separator therebetween. The positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder onto a positive electrode current collector, followed by drying and pressing. If necessary, a filler may be further added to the mixture. This structure is implemented in a sheet form can be applied to the process in the form of mounting on the loading roll.

The positive electrode current collector is generally made to a thickness of 3 to 500 μm. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel Surface-treated with carbon, nickel, titanium, silver or the like on the surface of may be used. The current collector may have fine irregularities on the surface thereof to increase the adhesive force of the cathode active material, and various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric are possible. In the embodiment according to the present invention described above, the electrode tab may be formed to have the same material as the material of the positive electrode current collector.

In addition, when the positive electrode active material is a lithium secondary battery, for example, a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Formula _{Li 1 + x Mn 2 - x} O 4 ( where, x is from 0 to 0.33 Im), LiMnO _3, the lithium manganese oxide such as LiMn ₂ O _3, LiMnO _2; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ , Cu ₂ V ₂ O ₇ and the like; Ni-site type lithium nickel oxide represented by the formula LiNi _{1 - x} M _x O ₂ , wherein M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x = 0.01 to 0.3; Formula LiMn _{2 - x} M _x O ₂ (wherein M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or Li ₂ Mn ₃ MO ₈ (wherein M = Fe, Co, Lithium manganese composite oxide represented by Ni, Cu or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; and the like, but Fe ₂ (MoO _{4) 3,} but is not limited to these.

In addition, the conductive material is typically added in an amount of 1 to 50% by weight based on the total weight of the mixture including the positive electrode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

In addition, the binder is a component that assists in bonding the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 50 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

In addition, the filler is optionally used as a component for inhibiting the expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical changes in the battery, for example, olefin polymers such as polyethylene, polypropylene, etc. ; Fibrous materials such as glass fibers and carbon fibers are used.

(Cathode structure)

The negative electrode is manufactured by coating, drying, and pressing a negative electrode active material on a negative electrode current collector, and optionally, the conductive material, binder, filler, etc. may be further included as necessary. This structure is implemented in a sheet form can be applied to the process in the form of mounting on the loading roll.

The negative electrode current collector is generally made to a thickness of 3 to 500 μm. Such a negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery. For example, the surface of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel Surface treated with carbon, nickel, titanium, silver, or the like, aluminum-cadmium alloy, or the like can be used. In addition, like the positive electrode collector, fine unevenness can be formed on the surface to enhance the bonding force of the negative electrode active material, and it can be used in various forms such as films, sheets, foils, nets, porous bodies, foams and nonwoven fabrics. In the exemplary embodiment according to the present invention, the electrode tab may be formed to have the same material as that of the negative electrode current collector.

The negative electrode active material may include, for example, carbon such as non-graphitized carbon or graphite carbon; Li _x Fe ₂ O ₃ (0 ≦ _x ≦ 1), Li _x WO ₂ (0 ≦ _x ≦ 1), Sn _x Me _{1 - x} Me ' _y O _z (Me: Mn, Fe, Pb, Ge; Me' Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 <x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8); Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

(Membrane)

The separator according to the present invention implements simple lamination by forming a basic unit by a simple lamination process regardless of a folding process or a roll process. In particular, the adhesion of the separator, the positive electrode, and the negative electrode in the laminator is such that the separator sheet itself is melted by heat and adhered to the inside of the laminator. This allows the pressure to be maintained continuously, thereby enabling stable interfacial contact between the electrode and the separator sheet.

As long as the separator interposed between the anode and the cathode of the separator sheet or cell has an insulating property and a porous structure capable of moving ions, the material thereof is not particularly limited, and the separator and the separator sheet may or may not be the same material. It may be.

As the separator or the separator sheet, for example, an insulating thin film having high ion permeability and mechanical strength may be used, and the pore diameter of the separator or the separator sheet is generally 0.01-10 μm, and the thickness is generally 5∼. 300 μm. Examples of the separator or separator sheet include olefin polymers such as polypropylene, which is resistant to chemicals and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane. Preferably, a multilayer film produced by a polyethylene film, a polypropylene film, or a combination of these films, or a film made of polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile, or poly A polyvinylidene fluoride hexafluoropropylene copolymer or the like, or a polymer film for a gel-type polymer electrolyte.

It is preferable that the separator has an adhesive function by heat fusion in order to form a basic unit cell, and the separator sheet does not necessarily have such a function, but it is preferable to use an adhesive function.

The electrode assembly according to the present invention can be applied to an electrochemical cell that produces electricity by the electrochemical reaction of the positive electrode and the negative electrode, a representative example of the electrochemical cell, a super capacitor (super capacitor), an ultra capacitor (ultra capacitor) ), Secondary batteries, fuel cells, various sensors, electrolysis devices, electrochemical reactors, and the like, and secondary batteries are particularly preferred.

The secondary battery has a structure in which the electrode assembly capable of charging and discharging is embedded in a battery case in a state impregnated with an ion-containing electrolyte solution. In one preferred embodiment, the secondary battery may be a lithium secondary battery.

Recently, a lithium secondary battery has attracted much attention as a power source for large devices as well as small mobile devices, and it is desirable to have a small weight when applied to such a field. As one way to reduce the weight of the secondary battery, a structure in which the electrode assembly is incorporated in a pouch type case of an aluminum laminate sheet may be preferable. Since such a lithium secondary battery is known in the art, the description thereof will be omitted.

In addition, as described above, when used as a power source for a medium-to-large device, a secondary battery having a structure capable of minimizing the deterioration of operation performance even during long-term use, having excellent life characteristics, and capable of mass production at low cost is preferable. In this regard, the secondary battery including the electrode assembly of the present invention may be preferably used in a medium-large battery module having the unit cell.

In the case of a battery pack including a battery module including a plurality of secondary batteries, a power tool (power tool); Electric vehicles selected from the group consisting of electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); E-bikes; E-scooters; Electric golf cart; Electric truck; And it can be used as one or more power source selected from the medium-large device group consisting of electric commercial vehicles.

The medium-large battery module is configured to provide a high output capacity by connecting a plurality of unit cells in series or in series / parallel manner, which is well known in the art, and thus, description thereof is omitted herein.

Example

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

(Example)

Ultrasonic welding of a plurality of electrode tabs and electrode leads protruding from the current collector of the electrode assembly, incorporating an electrode assembly having a conventional structure, in a battery compartment including a top laminate sheet and a bottom laminate sheet having a receiving portion. To form a V-forming part. Subsequently, an insulating film made of a thermosetting resin (epoxy resin) is integrally formed through injection molding on a portion of the electrode lead disposed at the boundary between the upper laminate sheet and the lower laminate of the battery case (see FIG. 3 (a)). ), The upper laminate sheet and the lower laminate sheet were joined by heat fusion.

Subsequently, an electrolyte solution was injected into the battery case, and an outer circumferential surface of the battery case in which the upper laminate sheet and the lower laminate contacted each other was thermally fused to form a sealing portion in the battery case, thereby manufacturing a pouch type secondary battery.

(Comparative Example)

A plurality of electrode tabs and electrode leads protruding from the electrode assembly are ultrasonically welded, and then a portion of the electrode leads disposed at the boundary between the upper laminate sheet and the lower laminate of the battery case is pressed by two PP film materials. A pouch type secondary battery was manufactured in the same manner as in the above example, except that one lead assay was applied.

(Experimental Example 1)

The moisture permeability test results for the batteries prepared in Examples and Comparative Examples are shown in Table 1 below.

In this experiment, each of the 100 batteries was repeatedly performed, and the process of immersing the boundary portion of the insulating film in water after performing heat fusion of the battery case at high temperature and high pressure was performed 100 times.

Moisture penetration number due to defective insulation film formation Example 0 Comparative Example 13

In the above experiments, moisture penetration through the presence region of the insulating film in which the battery cases were thermally compressed in all 100 cells was not induced. On the other hand, the battery of the comparative example was confirmed that the traces of water penetration as a result of decomposition in a number of batteries.

100: secondary battery
200: battery case
300: electrode assembly
310, 320: electrode tab
410 and 420: lead portion (electrode lead)
430: insulating film
430: second insulating layer
430: first insulating layer
F1: top film of insulating film
F2: bottom film of insulating film
G: Injection Mold

Claims (17)

An electrode assembly in which a cathode and an anode are wound with a separator interposed therebetween,
An electrode lead tab extending from the electrode assembly,
Pouch packaging material for receiving the electrode assembly,
Insulation film formed on the contact surface of the electrode lead tab and the pouch case, for insulation between the electrode lead tab and the pouch case,
The insulating film is a secondary battery, characterized in that formed in an integral structure on the electrode lead entire surface (joint surface) to be bonded to the pouch packaging material through the injection molding. The method according to claim 1,
The integrated electrode lead structure having the insulating film is formed by placing the electrode lead in an injection mold, supplying an insulating material for forming the insulating film into the injection mold in a liquid state, and then curing the electrode lead. Secondary battery. The method according to claim 1,
The integrated electrode lead structure having the insulating film is a secondary battery, characterized in that formed in a non-porous structure in which no gap exists between the surface of the electrode lead and the insulating film. The method according to claim 1,
The insulating film is a secondary battery, characterized in that attached to each electrode lead is formed independently, or as a unit attached to two electrode leads at the same time formed. The method according to claim 1,
The width of the insulating film is a secondary battery, characterized in that the same as, or smaller than the width of the electrode lead welding portion bonded to the pouch packaging material. The method according to claim 1,
The total thickness of the insulating film is a secondary battery, characterized in that 10 to 150㎛. The method according to claim 1,
The insulating film is a secondary battery comprising a thermosetting resin. The method of claim 7,
The thermosetting resin is a secondary battery, characterized in that at least one thermosetting resin selected from the group consisting of melanin resin, phenol resin, urea resin, epoxy resin, and polyurethane. The method according to claim 1,
The insulating film is a multi-layered insulating film including a first insulating layer formed by being in direct contact with at least one surface of the electrode lead and a second insulating layer which is directly stacked on the first insulating layer. Secondary battery. The method of claim 9,
At least one of the first insulating layer and the second insulating layer comprises a thermosetting resin. The method of claim 10,
The first insulating layer comprises a polypropylene resin,
The second insulating layer is a secondary battery comprising a thermosetting resin. The method of claim 11,
The thermosetting layer resin is a secondary battery comprising at least one thermosetting resin selected from the group consisting of melanin resin, phenol resin, urea resin, epoxy resin, and polyurethane. The method of claim 9,
The total thickness of the multilayer insulating film is a secondary battery, characterized in that 10 to 150㎛. The method according to claim 1,
The pouch packaging material is a secondary battery, characterized in that consisting of a laminate sheet comprising a resin layer and a metal layer. The method according to claim 1,
The electrode assembly is a secondary battery, characterized in that made of any one of a wound type, stack type or stack / folding type structure. 16. The method of claim 15,
The secondary battery is a secondary battery, characterized in that the pouch type secondary battery. An electrochemical device selected from the group consisting of a battery module comprising a secondary battery of claim 1 and a module of a plurality of batteries.

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