KR101417995B1 - Pouch-type secondary battery lead tab and pouch-type secondary battery using thereof - Google Patents

Abstract

The present invention relates to a lead tab of a pouch-type secondary battery and a pouch-type secondary battery including the same and, more specifically, to a lead tab of a pouch-type secondary battery which comprises: a metal terminal connected to a cathode or an anode of an electrode assembly sealed by a pouch; a polymer sealant for surrounding the metal terminal; and a coating layer having hydrophilic monomers polymerized in between the metal terminal and polymer sealant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pouch type secondary battery lead tab and a pouch type secondary battery including the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch type secondary battery lead tab and a pouch type secondary battery including the same, and more particularly, to a pouch type secondary battery lead tab having an excellent bonding force and improved sealing performance and a pouch type secondary battery including the same .

Increasing demand for portable IT devices and increasing energy density of lithium secondary batteries according to demands of electric vehicles and large-capacity energy storage devices have been urgently required. In order to solve such a demand, the weight of the polymeric pouch film, which is not a lithium secondary battery using a conventional metal can as an exterior material, is being developed and used as a casing material is steadily increasing. Such a pouch film can be made thinner, and the formation of a high-purity film is expected to simplify the manufacturing process and simplify the production process, thereby continuously increasing demand.

In particular, securing the mechanical strength and high reliability in accordance with the use environment in accordance with the thinning and enlargement of the lithium secondary battery is a very important factor for using the pouch film, and driving the battery in a state where the safety is not ensured can cause a great accident have.

The pouch film is a form in which the inner polyolefin melts and acts as an adhesive to each other and sealing. While this method may have the effect of tightly sealing the contents of the interior, the lead tab between the layers of the film is in a completely non-sealable state. The lead tab is a connection terminal for electrically connecting the positive electrode and the negative electrode in the pouch film to the outside. In general, a polymer sealant serving as an adhesive is attached to a thin metal terminal.

However, the seal between the polymer sealant and the pouch film is excellent, but the seal between the polymer sealant and the metal terminal is not sufficiently sealed, and problems such as electrolyte leakage and gas outflow at the interface between the polymer sealant and the metal terminal frequently occur.

As a prior art for solving such a problem, Korean Patent Laid-Open Publication No. 10-2006-0117041 discloses a method for manufacturing a metal terminal by changing the phenomenon of a cross section of a metal terminal (a portion where a sealant is attached), or by forming a protrusion on the surface of a polymer sealant attached to a metal terminal, Discloses a method of improving the sealing performance between a polymer sealant and a polymer sealant, and Korean Patent Laid-Open No. 10-2006-0002568 discloses a method of manufacturing a sealant by completely sealing a metal terminal and a sealant by heating and pressing. However, these methods fail not only to strengthen the bond between intrinsic metal (metal terminal) and polymer (sealant), but also to insure reliability against long-term service life. Therefore, technology development is urgently needed to solve this problem.

Korean Patent Publication No. 10-2006-0117041 Korean Patent Publication No. 10-2006-0002568

It is an object of the present invention to provide a lead tab for a pouch type secondary battery having a high adhesion force between a metal terminal and a polymer sealant and having improved sealing performance and a pouch type secondary battery including the same.

A pouch type secondary battery lead tab according to the present invention includes: a metal terminal connected to an anode or a cathode of an electrode assembly sealed by a pouch; A polymer sealant surrounding a portion of the metal terminal; And a coating layer formed by polymerizing a compound represented by the following formula (1) between the metal terminal and the polymer sealant.

(Formula 1)

,Wherein R1 to R5 are each independently selected from the group consisting of hydrogen,

,

,

, 티올, 니트릴, 알데하이드, 이미다졸, 아자이드, 할로겐 또는 하이드록시이며; 상기 R11 내지 R15는 각각 독립적으로 수소 또는 (C1-C5)알킬이며; 상기 R1 내지 R5는 동시에 수소인 경우는 제외한다.

,

, Thiol, nitrile, aldehyde, imidazole, azide, halogen or hydroxy; Each of R11 to R15 is independently hydrogen or (C1-C5) alkyl; Except that R1 to R5 are hydrogen at the same time.

(R11 및 R12는 서로 독립적으로 수소 또는 (C1-C5)알킬)이며, 나머지는 수소일 수 있다.In the lead taps of a pouch type secondary battery according to an embodiment of the present invention, at least one of R 1 to R 5 in the formula (1)

(R11 and R12 independently of one another are hydrogen or (C1-C5) alkyl), and the remainder may be hydrogen.

In the pouch type secondary battery lead tab according to an embodiment of the present invention, the thickness of the coating layer may be 3 nm to 50 nm.

In the lead taps of the pouch type secondary battery according to an embodiment of the present invention, the coating layer may be formed by polymerizing the compound of Formula 1 on the surface of the metal terminal surrounded by the polymer sealant.

In the pouch type secondary battery lead tab according to an embodiment of the present invention, the polymer sealant may be a polyolefin or an acrylate having a crystallinity of 10 to 30%.

The polymer sealant may be selected from the group consisting of low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, copolymers of ethylene and acrylic acid derivatives, polybutene, polyisobutylene , Unleaded polypropylene (CPP), biaxially oriented polypropylene (OPP), inflated polypropylene (IPP), polymethyl acrylate, polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylate, poly Butyl acrylate, and polybutyl methacrylate, or a mixture of two or more thereof, or a copolymer of two or more thereof.

In the pouch type secondary battery lead tab according to an embodiment of the present invention, the metal of the metal terminal may be one or two of aluminum, nickel, copper, gold, silver, platinum, iron, carbon, chromium, manganese, Or more.

The pouch type secondary battery according to the present invention comprises an electrode assembly including a positive electrode plate, a negative electrode plate, a separator interposed between the positive electrode plate and the negative electrode plate, and an electrolyte; The lead tabs of the pouch type secondary battery connected to the positive electrode plate and the negative electrode plate of the electrode assembly, respectively; And a pouch formed by wrapping and sealing the electrode assembly and having electrode tabs drawn out to the outside.

The lead taps of the pouch type secondary battery according to the present invention are formed by coating a hydrophilic polymer on the surface of a metal terminal on which a polymer sealant is placed to improve the adhesion force between the metal terminal and the polymer sealant to suppress the peeling phenomenon, It is possible to prevent leakage of the contents and penetration of moisture and oxygen from the outside. Accordingly, defects of the pouch-type secondary battery can be reduced, and reliability and life of the pouch-type middle- or large-sized secondary battery to be used for 10 years or more can be improved.

FIG. 1 (a) is a view showing a lead tab according to an embodiment of the present invention in which a hydrophilic polymer is coated on a metal terminal with a polymer sealant.
FIG. 1 (b) is a diagram showing a polymer sealant on a hydrophilic polymer coated on a metal terminal in a lead tab according to an embodiment of the present invention.
2 is a view illustrating a pouch type secondary battery according to an embodiment of the present invention.
3 is a graph showing changes in surface composition measured by x-ray photoelectron spectroscopy before and after coating the surface of the hydrophilic polymer on the aluminum lead tab according to Example 3 of the present invention.
Figure 4 is the electrolysis liquid in the pouch in accordance with the storage time after storage for a pouch film produced by using the aluminum lead tab according to Comparative Example 1 and Example 3 of the present invention in an oven 60 ℃ [1.15M LiPF ₆ in EC: EMC = 3 / 7 (v / v)] was measured using Karl-Fisher.
FIG. 5 is a graph showing the relationship between the storage time of the electrolyte [LiPF ₆ 1.15 M in EC: EMC = 3/7 (v / v)] was measured using Karl Fischer.

Hereinafter, the pouch type secondary battery lead tab of the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

A pouch type secondary battery lead tab according to the present invention includes: a metal terminal connected to an anode or a cathode of an electrode assembly sealed by a pouch; A polymer sealant surrounding the metal terminal; And a coating layer formed by polymerizing a compound represented by the following formula (1) between the metal terminal and the polymer sealant.

(Formula 1)

,Wherein R1 to R5 are each independently selected from the group consisting of hydrogen,

,

,

, 티올, 니트릴, 알데하이드, 이미다졸, 아자이드, 할로겐 또 는 하이드록시이며; 상기 R11 내지 R15는 각각 독립적으로 수소 또는 (C1-C5)알킬이며; 상기 R1 내지 R5는 동시에 수소인 경우는 제외한다.

,

, Thiol, nitrile, aldehyde, imidazole, azide, halogen or hydroxy; Each of R11 to R15 is independently hydrogen or (C1-C5) alkyl; Except that R1 to R5 are hydrogen at the same time.

FIG. 1 is a perspective view of a pouch type rechargeable battery lead tab according to an embodiment of the present invention. FIG. 1 (a) is a view in which a coating layer 20 is formed on a metal terminal 10, The polymer sealant 30 is formed on the coating layer 20 formed on the metal terminal 10.

1, the coating layer 20 is disposed on the surface of the metal terminal 10 on which the polymer sealant 30 is formed and the coating layer 20 is formed on the surface of the polymer sealant 30 and the metal terminal 10 ) Can be improved.

The secondary battery lead tab is protruded to the outside of the pouch, which is one side of the battery assembly, which is connected to the positive electrode or the negative electrode of the electrode assembly and the other end of which covers the battery structure including the electrode assembly. The polymer sealant 30, Is formed in a region where the edge region and the metal terminal 10 are in contact with each other, and acts as an adhesive between the metal terminal 10 and the pouch when sealing the pouch. That is, the polymer sealant 30 may be formed to surround the surface of the metal terminal in the boundary region protruding out of the pouch.

The metal terminal 10 is an apparatus for connecting electrons to the anode or cathode of the electrode assembly so that electrons can move from the inside of the pouch to the outer conductor. It is required that electrons should be free to move, have no reactivity with organic solvents, Materials that are not oxidized or reduced under operating conditions should be used.

In this respect, the material constituting the metal terminal may be selected from aluminum, nickel, copper, gold, silver, platinum, iron, carbon, chromium, manganese and their alloys or their equivalents, But is not limited to. However, when a material containing iron or iron is used, it has a disadvantage in that the mechanical strength becomes strong and it is difficult to form or increase the mass, and when it is made of aluminum or aluminum alloy, flexibility may be improved. The metal terminal may preferably be made of aluminum, nickel, or an alloy thereof.

The thickness of the metal terminal may be 50 to 500 mu m. When the thickness is less than 50 탆, the mechanical strength of the metal is not sufficient and the polymer is also broken by a weak impact. If the thickness is more than 500 탆, pores may be generated when sealing with the pouch, .

The coating layer 20 imparts hydrophilicity to the surface of the metal terminal 10 and further enhances the adhesion between the metal terminal 10 and the polymer sealant 30 so that the secondary battery can have improved sealing properties and durability .

In detail, the coating layer may be formed by polymerizing a compound represented by the following formula (1), which is a hydrophilic monomer, on the surface of the metal terminal 10, and more specifically, the coating layer comprises a metal terminal Or the like.

(Formula 1)

,Wherein R1 to R5 are each independently selected from the group consisting of hydrogen,

,

,

, 티올, 니트릴, 알데하이드, 이미다졸, 아자이드, 할로겐 또는 하이드록시이며; 상기 R11 내지 R15는 각각 독립적으로 수소 또는 (C1-C5)알킬이며; 상기 R1 내지 R5는 동시에 수소인 경우는 제외한다.

,

, Thiol, nitrile, aldehyde, imidazole, azide, halogen or hydroxy; Each of R11 to R15 is independently hydrogen or (C1-C5) alkyl; Except that R1 to R5 are hydrogen at the same time.

The monomer of formula (1) includes an alkyl hydroxyl group and can be self-polymerized at a constant pH range, possesses excellent chemical stability, and can be coated at 50 nm or less.

When the metal terminal is impregnated into a coating liquid containing the monomer of Formula 1, specifically, a pH of 7 to 12, and then taken out and cleaned after a certain period of time, a metal terminal coated with the polymer of Formula 1 may be obtained. As the impregnation method, various methods such as a pressure coating method, a spin coating method, a spraying method or a roller coating method can be used as well as the general immersion coating method, but the present invention is not limited thereto.

At this time, in order to selectively form a coating layer only on the surface area of the metal terminal where the metal sealant is located, the metal surface other than the region where the coating layer is to be formed may be suitably protected before the metal terminal is impregnated into the coating solution. As a specific example, it is possible to prevent the formation of a coating layer by attaching an imide tape to a metal surface other than the coating layer forming region.

이며, 나머지는 수소일 수 있고, 여기서 R11 및 R12는 서로 독립적으로 수소 또는 (C1-C5)알킬일 수 있다.More specifically, at least one of R 1 to R 5 in the formula (1)

And the remainder may be hydrogen, wherein R11 and R12 independently of one another can be hydrogen or (C1-C5) alkyl.

이며, 나머지는 수소일 수 있고, 여기서 R11 및 R12는 서로 독립적으로 수소 또는 (C1-C5)알킬일 수 있다.More specifically, at least one of R 3 to R 5 in the general formula (1)

And the remainder may be hydrogen, wherein R11 and R12 independently of one another can be hydrogen or (C1-C5) alkyl.

이며 나머지는 수소일 수 있고, 여기서 R11 및 R12는 수소일 수 있다.More specifically, at least one of R 3 to R 5 in the above formula (1)

And the remainder may be hydrogen, wherein R11 and R12 may be hydrogen.

The monomer of Formula 1 is preferably dopamine. The monomer of formula (1) including the above-mentioned dopamine can be self-polymerized at a constant pH range including an alkyl hydroxyl group, possesses excellent chemical stability, can be coated at 50 nm or less, In particular, dopamine is expensive and can be self-polymerized using a buffer solution based on environmentally friendly and cheap distilled water instead of an organic solvent which is harmful to human body.

Specifically, the dopamine contained in the monomer of Formula 1 may be spontaneously polymerized at a pH of 7 to 12, preferably at a pH of 8 to 10, as shown in Reaction Scheme 1 below.

[Reaction Scheme 1]

In addition, the buffer solution is not limited to the kind, but one or more alcohols such as methanol and ethanol as well as distilled water may be added as described above.

The polymer sealant 30 may be a polymer sealant for use in a conventional pouch-type secondary battery which has chemical resistance and thermal adhesion to an electrolyte (electrolytic solution) to provide a sealing property to facilitate lamination between the pouch and the lead tab.

In particular, the polymer sealant layer is not limited to a polyolefin or an acrylate-based polymer having a crystallinity of 10 to 30%. When the crystallinity is less than 10%, the mechanical strength of the polymer is weakened at the time of adhering to the metal terminal, and the defect rate and the physical strain are increased in the process. On the other hand, when the crystallinity is over 30%, the moldability may be deteriorated.

 Examples of the polymer sealant include low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, copolymers of ethylene and acrylic acid derivatives, polybutene, polyisobutylene, unstretched polypropylene (CPP), biaxially oriented polypropylene ), An inflated polypropylene (IPP), polymethyl acrylate, polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate, and polybutyl methacrylate. Two or more mixtures or two or more copolymers.

The polymer sealant can be freely determined according to the shape, use, and the like of the secondary battery to be manufactured, and the thickness of the polymer sealant is not limited thereto, but may be 50 to 500 탆, specifically 100 to 300 탆.

The present invention includes a pouch type secondary battery including the above-described pouch type secondary battery lead tab, and the pouch type secondary battery may include a lithium secondary battery.

The pouch type secondary battery according to the present invention comprises an electrode assembly including a positive electrode plate, a negative electrode plate, a separator interposed between the positive electrode plate and the negative electrode plate, and an electrolyte; The lead tabs of the pouch type secondary battery connected to the positive electrode plate and the negative electrode plate of the electrode assembly, respectively; And a pouch formed by wrapping and sealing the electrode assembly and having electrode tabs drawn out to the outside.

FIG. 2 is a view showing a pouch type secondary battery 1 according to an embodiment of the present invention. The pouch type secondary battery may include an electrode assembly 200 and a pouch 100 as a battery case.

The electrode assembly 200 includes a negative electrode plate 210 on which a negative electrode active material is formed on a negative electrode collector and a positive electrode plate 220 on which a positive electrode active material is formed on a positive electrode collector 220. A separator is interposed between the positive electrode plate 210 and the positive electrode plate 220 , A laminate of a negative electrode plate and a positive electrode plate having a separator interposed therebetween may be immersed in an electrolyte.

The electrode assembly 200 shown in FIG. 2 is a jelly roll type in which a separation membrane is interposed between an anode plate 210 and a cathode plate 220 and then wound thereon. In addition, a cathode plate 210 cut in a predetermined size, The electrode assembly 200 may be stacked a plurality of times so that a separation membrane is interposed between the electrode assembly 220 and the electrode assembly 200,

The electrode assembly 200 has a current path to the outside of the battery through the negative electrode lead tab 230 and the positive electrode lead tab 240. One end of the lead tab for the pouch type secondary battery is connected to the negative electrode The lead tab 230 and the lead tab of the pouch type secondary battery may form a positive electrode lead tab 240 connected to the positive electrode plate 220.

The pouch 100, which is a battery case, has a space in its interior to receive the electrode assembly 200 in the space, and the negative electrode lead tab 230 and the positive electrode lead tab 240 are sealed to the outside.

That is, the electrode assembly 200 is housed in the pouch 100, and the cathode lead tab 230 and the anode lead tab 240 are extended to the sealing portion 300 formed at the edge of the pouch 100 Can be assembled.

At this time, the pouch 100 may be formed to include an outer coating layer 110 made of an insulating material, an intermediate layer 120 made of aluminum or SUS, and an inner sealant layer 130 made of a thermal adhesive material on the inner surface, have.

That is, in the region where the metal terminals are drawn out to the outside of the pouch 100, the polymer sealant formed on the metal terminal by the heat applied from the outside and the inner sealant layer 130 forming the inner surface of the pouch 100 melt, And the inner sealant layer 130, which forms the inner surface of the pouch 100, melts and adheres to each other to be sealed.

Hereinafter, the pouch type secondary battery lead tab according to the present invention will be described in more detail with reference to examples and comparative examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited to the following examples and comparative examples.

The properties of the lead taps prepared through the following examples and comparative examples were measured as follows.

(Coating polymer thickness measurement)

The thickness of the polymer coated on the metal terminal was measured by Depth Profiling using x-ray photoelectron spectroscopy.

(Evaluation of adhesion between metal terminal and polymer sealant)

The adhesion between the metal terminal and the polymer sealant was measured using the lead tabs prepared by the following examples and comparative examples using SAICAS (Surface and Interfacial Cutting Analysis System). In SAICAS, the blade of Boron Nitride enters the interface between the metal terminal and the sealant in the static load mode (horizontal speed: 2 um / sec, vertical speed: 0.5 um / sec, pressure load: 0.5 N) 0.2 N to peel the polymer sealant from the metal terminal and evaluate the bond strength through the measured force.

(Example 1)

First, an aluminum metal terminal having a thickness of 200 mu m is prepared. For the hydrophilic coating on the surface to which the polymer sealant is to be applied, a distilled water-based buffer solution (10 mM tris buffer solution, pH 8.5) and methanol are mixed at a ratio of 1: 1, and dopamine per 1 ml of the buffer solution and methanol solution And the mixture was stirred for 60 seconds to prepare a coating solution. Before the aluminum terminal was coated, an imide tape was pasted so that the hydrophilic polymer would not be coated, except at the point where the polymer sealant was attached. The aluminum terminal was agitated at 500 rpm for 1 hour in the prepared coating solution to coat poly-dopamine self-polymerized to aluminum metal. After coating, washing was performed in the order of acetone, distilled water and acetone, followed by drying in an oven at 60 ° C for 12 hours.

A hot press was performed to attach a modified polypropylene (melting point: 146 ° C) as a polymer sealant to the aluminum terminal. The temperature of the roll press was fixed at 180 占 폚, the pressure was 0.4 MPa, and the pressing time was 3 seconds. The bonding strength between the metal terminals of the prepared lead taps and the polymer sealant was evaluated five times through SAICAS and the average values are shown in Table 1 below.

(Examples 2 to 3)

An aluminum lead tab was produced under the same conditions as in Example 1 except that the impregnating time of the aluminum terminal in the coating solution was changed as shown in Table 1 below. The coating thickness of the coated polydopamine was measured, and the adhesion between the metal terminal and the polymer sealant was evaluated five times through SAICAS. The average values are shown in Table 1 below.

(Examples 4 to 6)

A nickel-copper lead tab was produced under the same conditions as in Examples 1 to 3 except that nickel-copper metal was used instead of aluminum as the metal terminal. The coating thickness of the coated polydopamine was measured, and the adhesion between the metal terminal and the polymer sealant was evaluated five times through SAICAS. The average values are shown in Table 1 below.

(Example 7)

The electrolytic solution was poured into the pouch using the aluminum lead taps prepared in Example 3 and Comparative Example 1, and then sealed. The electrolytic solution [LiPF6 1.15M in EC: EMC = 3/7 (v / v)] was measured using a Karl-fisher.

(Example 8)

The electrolytic solution was poured into the pouch using the nickel-copper lead tab manufactured in Example 6 and Comparative Example 2, and the electrolyte solution was sealed at 60 ° C in an electrolyte [LiPF6 1.15M in EC: EMC = 3 / (v / v)] was measured using a Karl-fisher.

(Comparative Example 1)

An aluminum lead tab was prepared under the same conditions as in Example 1 except that the aluminum lead tab was not coated with a hydrophilic polymer. The bonding strength between the metal terminal and the polymer sealant was evaluated five times through SAICAS. The average values are shown in Table 1 below.

(Comparative Example 2)

An aluminum lead tab was prepared under the same conditions as in Example 4 except that the nickel-copper lead tab was not coated with a hydrophilic polymer. The bonding strength between the metal terminals of the prepared lead taps and the polymer sealant was evaluated five times through SAICAS and the average values are shown in Table 1 below.

[Table 1]

As a result of the measurement of the surface composition change by x-ray photoelectron spectroscopy as shown in Fig. 3 for evaluating whether the aluminum terminal is actually coated with polypodamine, the electrons of 2p of aluminum were measured before coating, 1s electrons of nitrogen (N) in the amine group are observed in the molecular structure of dopamine, and the 1s electrons of carbon (C) are increased, indicating that the coating is well formed.

As shown in Table 1, it can be seen that the thickness of the polypodamine coated on the surface of the aluminum terminal increases with time, and the pouch and the lead tab made by coating the coating thickness to a thickness of 3 to 35 nm It was confirmed that the increase in thickness was not affected.

4 shows the results of measurement of water content in the electrolytic solution evaluated in Example 7 of the present invention using Karl Fischer.

5 shows the results of measurement of water content in the electrolytic solution evaluated in Example 8 of the present invention using Karl Fischer.

4 and 5, it can be seen that the penetration of moisture is effectively prevented even though the thickness of the coating layer is as thin as several nm. As can be seen from Table 1, the adhesion force is improved even with a coating thickness of several nanometers . Also, it can be seen that as the thickness of the polymer coating increases, the binding force increases further.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (8)

A metal terminal connected to the anode or the cathode of the electrode assembly sealed by the pouch;
A polymer sealant surrounding a portion of the metal terminal; And
A coating layer formed between the metal terminal and the polymer sealant by polymerization at a surface of a metal terminal surrounded by a polymeric sealant and having a thickness of 3 nm to 35 nm;
Wherein the lead tabs of the pouch type secondary battery are formed of a metal.
(Formula 1)

(Wherein R1 to R4 are hydrogen, and R5 is

And R11 to R12 are each independently hydrogen or (C1-C5) alkyl, delete delete delete The method according to claim 1,
Wherein the polymer sealant is a polyolefin or an acrylate having a crystallinity of 10 to 30%. The method according to claim 1,
The polymer sealant may be selected from the group consisting of low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, copolymers of ethylene and acrylic acid derivatives, polybutene, polyisobutylene, unoriented polypropylene (CPP), biaxially oriented polypropylene One or more selected from the group consisting of polypropylene, polypropylene, polypropylene (IPP), polymethyl acrylate, polyethyl acrylate, polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate and polybutyl methacrylate Mixture or two or more copolymers. The method according to claim 1,
Wherein the metal of the metal terminal is selected from one or more of aluminum, nickel, copper, gold, silver, platinum, iron, carbon, chromium, manganese and alloys thereof. An electrode assembly including a positive electrode plate, a negative electrode plate, a separator interposed between the positive electrode plate and the negative electrode plate, and an electrolyte;
The pouch type secondary battery lead tab according to any one of claims 1 to 7, which is connected to the positive electrode plate and the negative electrode plate of the electrode assembly, respectively.
And a pouch formed to enclose the electrode assembly and seal the electrode tab to be drawn out to the outside.

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