KR102083162B1 - Electrode lead assembly for secondary battery and method for manufacturing the same - Google Patents

Abstract

An electrode lead assembly for a secondary battery and a method of manufacturing the same are provided. Electrode lead assembly for a secondary battery according to an embodiment of the present invention is one side is connected to the electrode cell and the first electrode lead; A second electrode lead disposed to face the first electrode lead to partially overlap the first electrode lead; A conductive adhesive layer provided in an overlapping region between the first electrode lead and the second electrode lead; A sealing member provided on the second electrode lead at the other end side of the first electrode lead; And an insulating member disposed to surround the sealing member and the overlapping region, and disposed between each of the first electrode lead and the second electrode lead and an inner surface of the pouch.

Description

Electrode lead assembly for secondary battery and manufacturing method thereof {Electrode lead assembly for secondary battery and method for manufacturing the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch type secondary battery, and more particularly, to an electrode lead assembly for a secondary battery extending outward from an electrode assembly of an electrode cell accommodated in a pouch and a method of manufacturing the same.

In general, secondary batteries are used as driving power sources for portable wireless devices and electric vehicles. Among them, especially lithium secondary batteries have long life and high energy density, and demand is rapidly increasing. In recent years, since a lithium battery is made of a flexible material, its shape can be freely designed. In addition, lithium batteries are excellent in safety and light in weight, making them suitable for portable electronic devices.

Pouch-type lithium batteries are utilized for large-capacity batteries used in medium and large devices such as electric vehicles. Here, the pouch type secondary battery is provided with an electrode lead for electrical connection between the battery body and the outside when the electrode assembly is accommodated in a pouch which is an exterior material.

On the other hand, since the secondary battery is accompanied by heat during the decomposition reaction of the electrolyte during overcharging and discharging, there is a possibility that the battery may be ignited and exploded. In order to improve stability inside the battery cell, an electrode lead to which a current interrupt (CI) function is added has been proposed.

Such an electrode lead may shorten the electrode lead itself by a change in the pouch physically connected to the electrode lead when an abnormality occurs, thereby preventing explosion due to overcharging in advance, thereby improving stability and lifespan of the battery. Here, the use of the electrode lead to which the current blocking function is added may be used in any position where the physically connected portion is not limited to the inside of the pouch but can detect the change of the pouch shape.

In the case of the pouch type secondary battery, when the electrode lead is composed of two-stage structure to implement the current blocking function, the electrode lead does not satisfy the same level of resistance as the one-stage structure and does not secure sufficient adhesion between the metal and the insulating film of the electrode lead. It does not secure the electrolyte resistance.

In addition, when the EV is applied to a power tool driven by a motor exposed to frequent vibrations and strong impacts in a limited mounting space, a level of metal adhesion that can withstand vibration and a certain level to operate the current blocking function There is a demand for a method that simultaneously satisfies the adhesive force.

KR 2016-0120089 A

In order to solve the problems of the prior art as described above, an embodiment of the present invention is to provide an electrode lead assembly for a secondary battery and a method of manufacturing the same that can effectively block the leakage of the electrolyte at the same time effectively performing the current blocking function.

In addition, an embodiment of the present invention is to provide a method for manufacturing an electrode lead assembly for a secondary battery that can improve the manufacturing efficiency by reducing the time required for the paste curing and film bonding process.

In addition, an embodiment of the present invention is to provide a method of manufacturing an electrode lead assembly for a secondary battery that can improve the airtightness between the insulating film on both sides of the electrode lead.

According to an aspect of the present invention for solving the above problems, one side is connected to the electrode cell and the first electrode lead; A second electrode lead disposed to face the first electrode lead to partially overlap the first electrode lead; A conductive adhesive layer provided in an overlapping region between the first electrode lead and the second electrode lead; A sealing member provided on the second electrode lead at the other end side of the first electrode lead; And an insulating member disposed to surround the sealing member and the overlapping region, the insulating member being disposed between each of the first electrode lead and the second electrode lead and an inner surface of the pouch.

In one embodiment, the adhesive force between each of the first electrode lead and the second electrode lead and the conductive adhesive layer may be less than the adhesive force between the insulating member and the sealing member.

In one embodiment, the first electrode lead and the second electrode lead is provided with an electrolytic resistant coating layer in a portion other than the overlapping region, the width of the first electrode lead and the second electrode lead is the same, The length of the second electrode lead may be longer than the length of the first electrode lead.

In one embodiment, the ratio of the length of the second electrode lead to the length of the first electrode lead is 1: 3 to 1: 5, and the ratio of the area of the first electrode lead to the area of the overlap region is 1: 2 to 1: 4.

In one embodiment, the conductive adhesive layer may have a volume resistivity of 10 ⁻³ Ω · cm or less.

In one embodiment, the sealing member has an inclined surface to compensate for the step difference between the first electrode lead and the second electrode lead, the thickness of the sealing member compared to the thickness of the first electrode lead and the second electrode lead 110 to 115%, and the sealing member may include the same material as the insulating member.

In an exemplary embodiment, a bonding length between the sealing member and the second electrode lead is greater than a distance from one end of the second electrode lead to one end of the insulating member, and from the one end of the second electrode lead. The distance to one end may be 2 mm or less.

In one embodiment, the thickness of the insulating member may be 50 to 80% of the thickness of the first electrode lead and the second electrode lead.

In one embodiment, the insulating member has a double or more laminated structure, and includes an insulating layer, a first adhesive layer and a second adhesive layer, at least a portion of the space between the overlapping region and the insulating member of the first adhesive layer Can be filled by fusion.

In one embodiment, the insulating member and the sealing member may be formed in a film shape.

According to another aspect of the invention, one side is connected to the electrode cell and the first electrode lead; A second electrode lead disposed to face the first electrode lead to partially overlap the first electrode lead; A conductive adhesive layer provided in an overlapping region between the first electrode lead and the second electrode lead; And a sealing member provided on the second electrode lead at the other end side of the first electrode lead, wherein the first breaking force with respect to the entire region provided with the sealing member is the entire region provided with the conductive adhesive layer. Provided is an electrode lead assembly for a secondary battery having a greater than second breaking force.

In one embodiment, the electrode lead assembly for the secondary battery is provided to surround the sealing member and the overlapping region, the insulating member disposed between each of the first electrode lead and the second electrode lead and the inner surface of the pouch; Further, the third breaking force for the entire region with the insulating member on the outside of each of the sealing member and the conductive adhesive layer may be less than the second breaking force.

According to still another aspect of the present invention, there is provided a method, comprising: partially plating a portion other than an overlapping region where a first electrode lead and a second electrode lead face each other with an electrolytic coating layer; Bonding the first electrode lead and the second electrode lead by applying a conductive paste to the overlapping region between the first electrode lead and the second electrode lead; Bonding a sealing member on the second electrode lead at the other end side of the first electrode lead; And bonding an insulating member so as to surround the sealing member and the overlapping region.

In an embodiment, the method of manufacturing an electrode lead assembly for a secondary battery may include heating the first electrode lead and the second electrode lead to 120 to 200 ° C. to fill at least a portion of the space between the overlapping region and the insulating member. The method may further include partially fusion bonding the insulating member.

In one embodiment, the manufacturing method of the electrode lead assembly for secondary batteries is 4-8 seconds at 80 ~ 120 ℃ while pressing the gloss adjustment sheet at a pressure of 3 ~ 5kgf / ㎠ after placing the top and bottom of the insulating member The method may further include adjusting the glossiness of the insulating member by heating.

In one embodiment, the step of bonding the electrode lead is applied to the conductive paste at a weight of 0.01 ~ 0.05mg / ㎜, and pressurized at a pressure of 5 ~ 10kgf / ㎠ 1 ~ at a temperature of 160 ~ 180 ℃ The conductive paste may be cured by heating for 10 minutes.

In one embodiment, the step of bonding the insulating member may be heated to a temperature of 120 ~ 180 ℃ for 4-8 seconds while pressing at a pressure of 3 ~ 5kgf / ㎠ to bond the insulating member.

In one embodiment, the step of fusion welding may support both sides of the insulating member with a crimping tip to prevent sagging of the insulating member.

According to an embodiment of the present invention, an electrode lead assembly for a secondary battery and a method of manufacturing the same may be configured to provide a current blocking function and leakage blocking of an electrolyte at the same time by configuring the electrode lead in two stages and adding a sealing member to the outside of the pouch. Reliability can be improved.

In addition, the present invention can improve resistance and adhesion while using an electrode lead having a two-stage structure by bonding the conductive region without plating to the overlapping region between the electrode leads.

In addition, the present invention can shorten the work time by adding pressure during paste curing or bonding process of each member, thereby improving productivity.

In addition, according to the present invention, by further heating only the electrode leads after the attachment of the insulating member to fuse the inside of the insulating member, the airtightness between the electrode leads and the insulating film can be ensured, thereby improving the reliability of the product. .

1 is a cross-sectional view showing a state in which an electrode lead assembly for a secondary battery is coupled to a pouch of a secondary battery according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view illustrating a difference in breaking force of respective regions in FIG. 1;
3 is a plan view of an electrode lead assembly for a secondary battery according to an embodiment of the present invention;
4 is a cross-sectional view taken along the X-ray of FIG.
5 is a partially enlarged view of area A of FIG. 4;
6 is a cross-sectional view taken along the line Y of FIG.
7 is a cross-sectional view illustrating a current blocking principle according to expansion of a secondary battery during overcharging in FIG. 1;
8 is a flowchart illustrating a method of manufacturing an electrode lead assembly for a secondary battery according to an embodiment of the present invention;
9 is a plan view showing a partially plated state of an electrode lead;
10 is a cross-sectional view showing a bonding state of an electrode lead;
11 is a sectional view showing a bonding state of a sealing member;
12 is a plan view illustrating a bonding state of an insulating member;
13 is a cross-sectional view showing a bonding state of an insulating member;
14 is a cross-sectional view showing a step for joining an insulating member;
15 is a cross-sectional view showing a step for partially welding an insulating member;
16 is a cross-sectional view showing a state in which an insulating member is partially fused;
17 is a cross-sectional view showing a step for preventing sagging of an insulating member, and
It is sectional drawing which shows the process for adjusting the glossiness of an insulating sheet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

Hereinafter, a secondary battery electrode lead assembly according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, an electrode lead assembly 100 for a secondary battery according to an exemplary embodiment of the present invention may include a first electrode lead 110, a second electrode lead 120, a conductive adhesive layer 130, and a sealing member 140. And an insulating member 150.

Here, the electrode lead assembly 100 for a secondary battery is for pulling out electrodes from the electrode cells 12 in the pouch 11 to the outside in the pouch type secondary battery. In this case, the electrode lead assembly 100 for the secondary battery has a function of preventing the electrolyte solution contained in the pouch 11 from leaking out.

In addition, the electrode lead assembly 100 for a secondary battery has a structure in which the first electrode lead 110 and the second electrode lead 120 are stacked in two stages, thereby providing a current blocking function.

The electrode lead assembly 100 for a secondary battery may be provided on at least one of both sides and a negative electrode of the secondary battery.

One side of the first electrode lead 110 is connected to the electrode cell 12 and the other side of the first electrode lead 110 is electrically connected to the second electrode lead 120 through the conductive adhesive layer 130.

One side of the second electrode lead 120 is disposed to face the other side of the first electrode lead 110. In this case, the second electrode lead 120 is disposed to overlap with a portion of the first electrode lead 110. Here, the first electrode lead 110 and the second electrode lead 120 may be made of metal. For example, the first electrode lead 110 and the second electrode lead 120 may include aluminum (Al) or copper (Cu).

The conductive adhesive layer 130 is provided in an overlapping region between the first electrode lead 110 and the second electrode lead 120. In addition, the conductive adhesive layer 130 has a role of electrically connecting and bonding the first electrode lead 110 and the second electrode lead 120 at the same time. In addition, the conductive adhesive layer 130 is broken when the inside of the pouch 11 is inflated due to overcharging or the like to separate the first electrode lead 110 and the second electrode lead 120.

The sealing member 140 is provided on the second electrode lead 120 at the other end side of the first electrode lead 110. In addition, the sealing member 140 is to prevent the electrolyte inside the pouch 11 from leaking to the outside when the first electrode lead 110 and the second electrode lead 120 are separated. In addition, the sealing member 140 is to improve the adhesive force between the electrode leads (110, 120) and the insulating member 150.

The insulating member 150 is provided to surround the overlapping region between the sealing member 140 and the first electrode lead 110 and the second electrode lead 120. In this case, the insulating member 150 is disposed between each of the first electrode lead 110 and the second electrode lead 120 and the inner surface of the pouch 11.

Here, the adhesive force between each of the first electrode lead 110 and the second electrode lead 120 and the conductive adhesive layer 130 may be smaller than the adhesive force between the insulating member 150 and the sealing member 140. For example, the adhesive force between the first electrode lead 110 and the second electrode lead 120 is 10 N / cm (UTM) or less, and the adhesive force between the insulating member 150 and the electrode leads 110 and 120 is 10 N / cm ( UTM).

On the other hand, the adhesive force between each component as described above may be described as the breaking force for each region. Referring to FIG. 2, the first breaking force with respect to the entire area A provided with the sealing member 140 is greater than the second breaking force with respect to the entire area B provided with the conductive adhesive layer 130. In addition, the third breaking force with respect to the entirety of the region C in which the insulating member 150 is provided outside the sealing member 14 and the conductive adhesive layer 130 may be smaller than the third breaking force.

For example, the second breaking force may have a size of 30 to 70% with respect to the first breaking force, and the third breaking force may have a size of 0 to 30%. Here, the third breaking force is 0 when the insulating member 150 is not provided outside the sealing member 140 and the conductive adhesive layer 130.

As a result, the first breaking force for the entire region (A), the second breaking force for the entire region (B) and the third breaking force for the entire region (C) are sequentially reduced.

As a result, when the inside of the pouch 11 is inflated due to overcharging or the like, the first electrode lead 110 and the second electrode lead 120 may be broken first to cut off the current. A detailed configuration for implementing such a current interruption function will be described in more detail below.

Referring to FIG. 3, the widths of the first electrode lead 110 and the second electrode lead 120 are the same, and the length L2 of the second electrode lead 120 is equal to the length of the first electrode lead 110. It may be longer than L1). For example, the ratio of the length L2 of the second electrode lead 120 to the length L1 of the first electrode lead 110 may be 1: 3 to 1: 5.

In this case, when the ratio is smaller than 1: 3, the length L1 of the first electrode lead 110 accommodated inside the pouch 11 is relatively large, thereby degrading the current blocking function. That is, when the length L1 of the first electrode lead 110 becomes longer, the conductive adhesive layer between the first electrode lead 110 and the second electrode lead 120 may expand due to expansion of the inside of the pouch 11 due to overcharge or the like. 130) the force to break is weakened.

In addition, in this case, since the length L1 of the first electrode lead 110 becomes relatively long, the size of the pouch 11 for accommodating the first electrode lead 110 increases, which adversely affects the miniaturization of the secondary battery. .

On the other hand, when the ratio is greater than 1: 5, the length L2 of the second electrode lead 120 drawn out of the pouch 11 becomes unnecessarily large, resulting in an increase in material cost and waste of resources.

In this case, the overlapping region where the first electrode lead 110 and the second electrode lead 120 are bonded may be determined in consideration of the adhesive force and workability therebetween. For example, the ratio of the area of the first electrode lead 110 to the area of the overlapping region between the first electrode lead 110 and the second electrode lead 120 may be 1: 2 to 1: 4.

Referring to FIG. 3, when the first electrode lead 110 and the second electrode lead 120 have the same width, the width of the overlapping area between the first electrode lead 110 and the second electrode lead 120 ( The ratio of the length L1 of the first electrode lead 110 to W3) may be 1: 2 to 1: 4.

In this case, when the ratio is smaller than 1: 2, the current blocking function is deteriorated because the width W3 of the overlapping region between the first electrode lead 110 and the second electrode lead 120 increases relatively. That is, since the adhesive force between the first electrode lead 110 and the second electrode lead 120 increases, the first electrode lead 110 and the second electrode lead 120 are expanded due to the expansion of the inside of the pouch 11 due to overcharge or the like. The force at which the conductive adhesive layer 130 breaks between the layers becomes weak.

In addition, since the portion connected to the electrode assembly to be connected to the electrode cell 12 is relatively small, work efficiency is low.

On the other hand, when the ratio is greater than 1: 4, the width W3 of the overlapping region between the first electrode lead 110 and the second electrode lead 120 is relatively reduced, so that the first electrode lead 110 is reduced. And the adhesive force between the second electrode lead 120 decreases. Therefore, the conductive adhesive layer 130 between the first electrode lead 110 and the second electrode lead 120 is easily broken even by the small expansion of the inside of the pouch 11 due to overcharge or the like, thereby lowering the reliability of the product.

Referring to FIG. 5, the first electrode lead 110 and the second electrode lead 120 may be provided with electrolytic coating layers 112 and 122 at portions other than the overlap regions 110a and 120a. That is, since some of the first electrode lead 110 and the second electrode lead 120 are exposed to the electrolyte contained in the pouch 11, the first electrode lead 110 and the second electrode lead 120 may be plated with an electrolytic resistant material to prevent oxidation. For example, the coating layers 112 and 122 may include nickel (Ni).

Here, since the overlapping regions 110a and 120a to which the conductive adhesive layer 130 is adhered are not provided with the electrolytic resistant coating layers 112 and 122, the first electrode lead 110 and the second electrode lead through the conductive adhesive layer 130 ( The electrical conductivity between the 120 may be increased to improve the resistance between the first electrode lead 110 and the second electrode lead 120 due to the two-stage structure.

In this case, since the first electrode lead 110 and the second electrode lead 120 are formed in a two-layer stack structure, the contact resistance may be minimized to be within 10% of the resistance of the first electrode lead 110.

To this end, the conductive adhesive layer 130 is preferably low in electrical conductivity. For example, the conductive adhesive layer 130 may have a volume resistivity of 10 ⁻³ Ω · cm or less to minimize contact resistance. In this case, when the volume resistivity of the conductive adhesive layer 130 is greater than 10 ⁻³ Ω · cm, the electrical resistance between the first electrode lead 110 and the second electrode lead 120 increases, thereby reducing unnecessary power consumption and heat generation. Cause.

In addition, the thickness of the conductive adhesive layer 130 may be 20 ~ 100㎛. Here, when the thickness of the conductive adhesive layer 130 is smaller than 20 μm, the adhesive force decreases and the contact resistance between the first electrode lead 110 and the second electrode lead 120 increases. On the other hand, when the thickness of the conductive adhesive layer 130 is greater than 100 μm, the overall thickness of the two-stage stacked structure of the first electrode lead 110 and the second electrode lead 120 increases to increase the thickness of the first electrode lead 110. Since the step difference between the second electrode lead 120 increases, adhesion between the first electrode lead 110 and the second electrode lead 120 and the insulating member 150 is inferior.

In addition, the conductive adhesive layer 130 may be formed of a material having a resistance to the electrolyte while providing the adhesive strength with the first electrode lead 110 and the second electrode lead 120 or more. In addition, the conductive adhesive layer 130 may be made of a material whose characteristics such as drying conditions and viscosity match the process workability.

The sealing member 140 is to improve the adhesive force between the electrode leads 110 and 120 and the insulating member 150. Here, the sealing member 140 may include the same material as the insulating member 150. Thereby, adhesion with the insulating member 150 is easy and adhesive force can be improved.

Referring to FIG. 4, the junction length W2 between the sealing member 140 and the second electrode lead 120 is the distance W1 from one end of the second electrode lead 120 to one end of the insulating member 150. Can be greater than

As a result, the adhesive force between the electrode leads 110 and 120 and the insulating member 150 by the sealing member 140 is greater than the adhesive force between the first electrode lead 110 and the second electrode lead 120. The breakage between the first electrode 110 and the second electrode lead 120 occurs first to cut off the current.

In addition, the sealing member 140 is to compensate for the step between the first electrode lead 110 and the second electrode lead 120 to improve the adhesion to the insulating member 150 when sealing the pouch 11. Referring to FIG. 4, the sealing member 140 may have an inclined surface to compensate for the step difference between the first electrode lead 110 and the second electrode lead 120. In this case, the sealing member 140 may have the same width as that of the first electrode lead 110 and the second electrode lead 120.

In addition, the thickness of the sealing member 140 may be 110 to 115% of the thickness t1 of the first electrode lead 110 and the thickness t2 of the second electrode lead 120. Here, when the thickness of the sealing member 140 is smaller than 110% of the thicknesses t1 and t2 of the electrode leads 110 and 120, sufficient airtightness between the first electrode lead 110 and the second electrode lead 120 is ensured. can not do. That is, the electrolyte in the pouch 11 leaks to the outside, and reduces the stability of a product.

On the other hand, when the thickness of the sealing member 140 is greater than 115% of the thicknesses t1 and t2 of the electrode leads 110 and 120, the step difference compensation effect between the first electrode lead 110 and the second electrode lead 120 may be reduced. Can not provide. That is, the flatness of the electrode lead assembly 100 for secondary batteries is lowered, and thus the adhesion between the first electrode lead 110 and the second electrode lead 120 and the inner surface of the pouch 11 is lowered.

In this case, the distance W1 from one end of the second electrode lead 120 to one end of the insulating member 150 may be 2 mm or less.

Here, when the distance W1 is larger than 2 mm, the adhesive force between the insulating members 150 is greater than the adhesive force of the conductive adhesive layer 130 between the first electrode lead 110 and the second electrode lead 120. Therefore, the current interruption function between the first electrode lead 110 and the second electrode lead 120 is reduced. That is, the breakdown force of the conductive adhesive layer 130 is lowered because the insulating member 150 is maintained without breaking in the region corresponding to the distance W3 even when the inside of the pouch 11 is inflated due to overcharging or the like.

The insulating member 150 may be made of an insulating and heat sealable material. For example, the insulating member 150 may be formed of any one or more layers of materials selected from polyimide (PI), polyprophylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and the like. Can be done.

In this case, the insulating member 150 may have a stack structure of two or more. Preferably, the insulating member 150 may have a triple or more stacked structure. Referring to FIG. 6, the insulating member 150 may include a first adhesive layer 151, an insulating layer 152, and a second adhesive layer 153.

Here, the first adhesive layer 151 may be made of a material having excellent adhesive strength with the first electrode lead 110 and the second electrode lead 120. For example, the first adhesive layer 151 may be made of modified polypropylene to which maleic acid is added. In addition, the second adhesive layer 153 may be made of a material having excellent adhesive strength with the pouch 11. For example, the second adhesive layer 153 may be made of CPP (non-stretched polypropylene film).

The insulating layer 152 may be configured to provide high insulation between the pouch 11 and the electrode leads 110 and 1200 and to improve adhesion to the adhesive layers 151 and 153. In one example, the insulating layer 152 may be formed in the form of a nonwoven fabric (polyolefin-based, such as polyflopropylene). In addition, the insulating layer 152 may be made of high crystallized polypropylene (HCPP).

As a result, the insulating member 150 may be easily bonded to the first electrode lead 110, the second electrode lead 120, and the pouch 11, and the adhesive force may increase.

6, at least a part 151 ′ of the space between the overlapping region between the first electrode lead 110 and the second electrode lead 120 and the insulating member 150 is formed of the first adhesive layer 151. Can be filled by fusion.

That is, as will be described later, after the insulating member 150 is attached to the first electrode lead 110 and the second electrode lead 120, only the electrode leads 110 and 120 are additionally heated to form the insulating member 150. The first adhesive layer 151 may be further fused to fill the space 151 ′ between the overlapping region between the first electrode lead 110 and the second electrode lead 120 and the insulating member 150. Therefore, the space between the overlapping region between the first electrode lead 110 and the second electrode lead 120 and the insulating member 150 may be reduced or eliminated to a predetermined region (a).

As a result, the overall width of the insulating member 150 may be partially fused without being expanded to improve the adhesive force, and the overall flatness of the insulating member 150 may be increased. In addition, the airtightness between the first electrode lead 110 and the second electrode lead 120 may be improved between the insulating member 150 and the insulating member 150.

The thickness of the insulating member 150 may be 50 to 80% of the thicknesses t1 and t2 of the lead electrodes 110 and 120. Here, when the thickness of the insulating member 150 is smaller than 50% with respect to the thicknesses t1 and t2 of the lead electrodes 110 and 120, the step of the lead electrodes 110 and 120 during the welding for the bonding of the insulating members 150 may occur. The stretching is increased, so that the bonding with the lead electrodes 110 and 120 may not be sufficiently achieved, and the insulating property is degraded, resulting in insulation breakdown and leakage of the electrolyte during sealing of the pouch 11.

On the other hand, when the thickness of the insulating member 150 is greater than 80% with respect to the thicknesses t1 and t2 of the lead electrodes 110 and 120, since the thickness of the insulating member 150 becomes unnecessarily large, the pouch 11 is subsequently sealed. There is a fear of secondary contamination due to increased working time and leakage of unwanted resin of the insulating member 150.

Here, the sealing member 140 and the insulating member 150 may be formed in a film shape. As a result, when the sealing member 140 and the insulating member 150 are attached to the first electrode lead 110 and the second electrode lead 120, they can be easily bonded by fusion due to heating, and at the same time, the adhesive force can be improved. Can be.

Referring to FIG. 7, when the inside of the pouch 11 expands due to expansion of the electrode cell 12 and overheating of the electrolyte due to overcharging of a secondary battery, between the first electrode lead 110 and the second electrode lead 120. The conductive adhesive layer 130 'bonded to the breakage is broken.

Here, since the adhesive force between the insulating member 150 and the electrode leads 110 and 120 is greater than the adhesive force between the electrode leads 110 and 120, breakage of the conductive adhesive layer 130 ′ occurs first, and thus the first electrode lead 110 and the first electrode lead 110 and 120 are formed. By separating the two-electrode lead 120, the power applied from the outside through the second electrode lead 120 may be cut off, and thus the current may be cut off.

At this time, the inner side of the pouch 11 is separated between the electrode leads 110 and 120 with respect to the overlapping region between the first electrode lead 110 and the second electrode lead 120, but the outer side of the overlapping region is the sealing member 140. ) May be maintained by the adhesive force between the insulating member 150 and the insulating member 150.

Thereby, since the electrolyte solution in the pouch 11 is interrupted by the sealing member 140 and the insulating member 150, it can prevent that the pouch 11 leaks outside. Therefore, the current blocking function can be effectively performed and the leakage of the electrolyte can be reliably cut off, thereby improving the reliability of the product.

Hereinafter, a method of manufacturing the electrode lead assembly for a secondary battery of the present invention will be described with reference to FIGS. 8 to 18.

The method 200 of manufacturing an electrode lead assembly for a secondary battery includes steps of partially plating an electrode lead (S210), bonding an electrode lead (S220), bonding a sealing member (S230), and bonding an insulating member. (Step S240).

In more detail, as shown in FIG. 8, first, partial plating is performed on the portions of the first electrode lead 110 and the second electrode lead 120 other than the overlapped regions to be bonded to each other with the electrolytic resistant coating layer (step S210).

Here, the first electrode lead 110 and the second electrode lead 120 may be made of metal having the same width and different lengths. At this time, the first electrode lead 110 and the second electrode lead to facilitate the separation efficiency between the electrode lead (110, 120) and the electrode lead (110, 120) as the electrode lead (110, 120) is composed of a two-stage stacked structure. The length of 120 can be determined. For example, the length ratio of the second electrode lead 120 to the first electrode lead 110 may be 1: 3 to 1: 5.

Referring to FIG. 9, the coating layer 112 may be formed by partial plating except for a portion 110a that is bonded to the second electrode lead 120 on one surface of the first electrode lead 110. That is, the upper surface of the first electrode lead 110 may be plated entirely, and the lower surface of the first electrode lead 110 may be partially plated. Similarly, except for the portion 120a that is bonded to the first electrode lead 110 on one surface of the second electrode lead 120, the coating layer 122 may be formed by partially plating. That is, the second electrode lead 120 may be plated entirely on the bottom surface and partially plated on the top surface. At this time, the metal plate constituting the first electrode lead 110 and the second electrode lead 120 may mask the regions 110a and 120a and then proceed with plating.

As such, by not plating a portion where the first electrode lead 110 and the second electrode lead 120 are joined, the electrical resistance between the first electrode lead 110 and the second electrode lead 120 is reduced. At the same time, it is possible to improve contact resistance and adhesion with the conductive adhesive layer 130.

In addition, the area of the unplated portions 110a and 120a may be determined in consideration of workability while providing sufficient adhesion between the first electrode lead 110 and the second electrode lead 120. For example, an area ratio of the unplated part 110a to the total area of the first electrode lead 110 may be 1: 2 to 1: 4. Here, the unplated portion 120a of the second electrode lead 120 may have the same area as the unplated portion 110a of the first electrode lead 110.

Here, the coating layers 112 and 122 are intended to improve the resistance of the first electrode lead 110 and the second electrode lead 120 to prevent oxidation and resistance to the electrolyte and to improve adhesion to the insulating member 150.

In addition, the first electrode lead 110 and the second electrode lead 120 may be surface treated to improve weldability for the electrode cell 12 or the connection with the outside.

Optionally, round processing may be performed at corners corresponding to the joint portion with the insulating member 150. That is, in FIG. 9, upper and lower edges of the first electrode lead 110 and the second electrode lead 120 may be rounded. As a result, the airtightness of the first electrode lead 110 and the second electrode lead 120 with the insulating member 150 can be improved.

Next, the conductive paste 130 is applied to the overlapping regions 110a and 120a between the first electrode lead 110 and the second electrode lead 120 to form the first electrode lead 110 and the second electrode lead 120. (Step S220).

Referring to FIG. 10, the conductive paste 130 is coated on the unplated portion 120a of the second electrode lead 120, and the unplated portion of the first electrode lead 110 is disposed on the conductive paste 130. 110a) are arranged to face each other. In this case, the first electrode lead 110 and the second electrode lead 120 may be aligned so as not to leave the unplated portions 110a and 120a and the corners.

Here, the amount of application of the conductive paste 130 may be determined such that leakage does not occur when the first electrode lead 110 and the second electrode lead 120 are bonded to each other, and the thickness becomes 20 to 100 μm after the curing process. For example, the conductive paste 130 may be coated to have a weight of 0.01 to 0.05 mg / mm 2 after application in consideration of adhesion and resistance between the first electrode lead 110 and the second electrode lead 120.

In addition, the conductive paste 130 may be made of a material that provides a greater than a certain level of adhesive strength with the first electrode lead 110 and the second electrode lead 120 and minimizes contact resistance. In addition, the conductive paste 130 may be resistant to the electrolyte, and may be made of a material whose characteristics such as drying conditions and viscosity match process processability.

Here, the conventional process of heating to a predetermined temperature for curing the conductive paste 130 takes a lot of time. In addition, a gap is generated between the first electrode lead 110 and the second electrode lead 120 by the volume expansion of the conductive paste 130 during curing, thereby increasing the resistance.

In order to solve this problem, the present invention adds pressure to the electrode leads 110 and 120 simultaneously with heating. That is, the conductive paste 130 is heated and cured to a predetermined temperature while pressing the first electrode lead 110 and the second electrode lead 120 at a predetermined pressure.

As a result, productivity can be improved by shortening the curing time of the conductive paste 130. In addition, the gap between the first electrode lead 110 and the second electrode lead 120 which may be generated during curing may be minimized.

For example, while pressing the first electrode lead 110 and the second electrode lead 120 at a pressure of 5 ~ 10kgf / ㎠ and heated for 1 to 10 minutes at a temperature of 160 ~ 180 ℃ conductive paste 130 Can be cured.

In this case, when the pressing force of the electrode leads 110 and 120 is less than 5 kgf / cm 2, since the curing proceeds before sufficient adhesion between the first electrode lead 110 and the second electrode lead 120 is sufficiently secured, the adhesion strength is weak. Become. On the other hand, when the pressing force of the electrode leads 110 and 120 is greater than 10 kgf / cm 2, the amount of leakage of the conductive paste 130 between the first electrode lead 110 and the second electrode lead 120 increases to substantially increase the electrode lead. Adhesion and resistance properties between (110, 120) are degraded.

In addition, when the heating temperature of the conductive paste 130 is less than 160 ° C, the time required for the conductive paste 130 to harden increases to increase the working time and consequently decrease fishability. On the other hand, when the heating temperature of the conductive paste 130 is greater than 180 ° C., the curing property of the conductive paste 130 is lowered and the adhesion between the first electrode lead 110 and the second electrode lead 120 is lowered.

In addition, when the heat time of the electrically conductive paste 130 is less than 1 minute, hardening of the electrically conductive paste 130 is not fully performed. On the other hand, when the heating time of the conductive paste 130 exceeds 10 minutes, the adhesion to the insulating member is lowered due to the metal surface oxidation, which is the electrode leads 110 and 120, and the productivity decreases due to unnecessary time increase.

Next, the sealing member 140 is disposed on the second electrode lead 120 at the other end side of the first electrode lead 110 and bonded (step S230). Here, the sealing member 140 is to prevent the electrolyte solution inside the pouch 11 from leaking to the outside when the first electrode lead 110 and the second electrode lead 120 are separated.

Referring to FIG. 11, the sealing member 140 may be disposed at a step between the first electrode lead 110 and the second electrode lead 120, and then bonded by heating. Here, since the sealing member 140 remains in a part of the first electrode lead 110, it may be removed for the planarization on the first electrode lead 110. As a result, the sealing member 140 may be disposed above the second electrode lead 120 at the outer side of the first electrode lead 110.

As a result, even when the first electrode lead 110 and the second electrode lead 120 are separated by the expansion of the inside of the pouch 11 due to overcharge or the like, the adhesion of the insulating member 150 is maintained, thereby preventing leakage of the electrolyte solution. Can be blocked.

The sealing member 140 is to improve the adhesive force between the electrode leads 110 and 120 and the insulating member 150. Here, the sealing member 140 may include the same material as the insulating member 150. Thereby, adhesion with the insulating member 150 is easy and adhesive force can be improved.

In addition, the sealing member 140 is to compensate for the step between the first electrode lead 110 and the second electrode lead 120 to improve the adhesion to the insulating member 150 when sealing the pouch 11. In this case, the sealing member 140 may have the same width as that of the first electrode lead 110 and the second electrode lead 120.

In addition, the thickness of the sealing member 140 may be 110 to 115% of the thickness t1 of the first electrode lead 110 and the thickness t2 of the second electrode lead 120.

As such, the flatness of the secondary battery electrode lead assembly 100 may be uniformly formed by compensating for the step difference caused by the two-stage structure of the first electrode lead 110 and the second electrode lead 120. Thereby, workability at the time of joining the insulating member 150 and the pouch 11 which are a later process can be ensured.

In this case, the sealing member 140 may have an inclined surface to compensate the step between the first electrode lead 110 and the second electrode lead 120.

Next, the insulating member 150 is bonded to surround the overlapping region between the sealing member 140 and the first electrode lead 110 and the second electrode lead 120 (step S240). Here, the insulating member 150 may have a width greater than the width of the first electrode lead 110 and the second electrode lead 120. In addition, the insulating member 150 may satisfy the adhesive force between the first electrode lead 110, the second electrode lead 120, and the pouch 11, and may be a material having resistance to the electrolyte.

12 and 13, the insulating member 150 is disposed to surround the overlapping region between the sealing member 140 and the first electrode lead 110 and the second electrode lead 120. In this case, the insulating member 150 overlaps between the first electrode lead 110 and the second electrode lead 120 to facilitate separation between the first electrode lead 110 and the second electrode lead 120 when the current is interrupted. It may be arranged to be biased toward the region side. For example, the distance W1 from one end of the second electrode lead 120 to one end of the insulating member 150 may be 2 mm or less (see FIG. 4).

Here, the thickness and width of the insulating member 150 may be determined in consideration of the change in fusion and the stretching due to the step according to the two-stage structure of the electrode leads 110 and 120. For example, the thickness of the insulating member 150 may be 50 to 80% of the thicknesses t1 and t2 of the lead electrodes 110 and 120.

Referring to FIG. 14, pressure tips 21 to 26 having heaters are separately disposed on upper and lower portions of the insulating member 150. Here, separate pressing tips 21 to 26 may be disposed by separating the insulating member 150 and the electrode leads 110 and 120 so as to uniformly transfer sufficient heat during fusion.

That is, the pressure tips 21 to 26 may individually adjust the temperature so that a temperature difference does not occur for each position. In addition, the tip 23 to 26 for electrode leads may be individually adjusted to adjust by the step difference of the electrode leads 110 and 120.

At this time, the tips 21 and 22 for the insulating member perform a fusion process for a predetermined time while setting the temperature to the melting point level of the insulating member 150 and pressing to a predetermined temperature. For example, the insulating member 150 may be bonded by heating at a temperature of 120 to 180 ° C. for 4 to 8 seconds while pressing at a pressure of 3 to 5 kgf / cm 2.

In this case, when pressure is applied at a pressure smaller than 3 kgf / cm 2, flatness may not be uniformly formed due to a step between the first electrode lead 110 and the second electrode lead 120. On the other hand, when pressurized at a pressure greater than 5 kgf / cm 2, the stretching of the insulating member 150 increases, thereby lowering the insulation of the insulating member 150 or the tolerance of the dimensions required for the design.

In addition, when heating to a temperature less than 120 ℃, the time that the insulating member 150 is fused increases the time required for the operation and as a result the productivity is reduced. On the other hand, when heated to a temperature higher than 180 ℃, the stretching of the insulating member 150 is increased, there is a fear of the adhesive strength with the pouch 11 to be carried out and the overall insulation deterioration, in particular exceeding the melting point of the insulating member 150 If you lose the original characteristics.

In addition, when heating for less than 4 seconds, fusion of the insulating member 150 is not made sufficiently. On the other hand, when heating for a time longer than 8 seconds, the stretching of the insulating member 150 is increased to satisfy the size specification.

In addition, the electrode leads tips 23 to 26 are heated to a constant temperature to maintain the temperature of the insulating member 150 for the compression time. For example, the first electrode lead 110 and the second electrode lead 120 are heated to 120 to 200 ° C.

Here, when heating to a temperature lower than 120 degreeC, the fusion characteristic falls because of the nonuniformity of temperature in the edge part of the insulating member 150. FIG. On the other hand, when heated to a temperature higher than 200 ℃, the insulating member 150 is drawn to the first electrode lead 110 and the second electrode lead 120 side does not satisfy the size specifications.

Meanwhile, the method 200 of manufacturing an electrode lead assembly for a secondary battery may further include partially fusion bonding the insulating member (S250).

In this case, the insulation members 150 and the tips 21 to 26 on the electrode leads 110 and 120 are heated and pressurized, and fusion between the electrode leads 110 and 120 and the insulation member 150 is performed. Due to the two-stage lead structure compared to the structure, the flatness of the electrode leads 110 and 120 is uniformly maintained, the thickness is maintained so that the insulation of the insulating member 150 is not destroyed, and the adhesion strength is not increased. It is not easy to secure.

To this end, the present invention is performed by dividing the fusion section of the insulating member 150 into one or more times according to characteristics. That is, it may be performed by dividing into a temporary section for determining the position of the insulating member 150 on the electrode leads (110, 120), the bubble removing section between the insulating member 150 and the section for securing the surface airtightness and edge tightness. . Here, the provisional section is the same as described with reference to step S240.

Referring to FIG. 15, after the insulating member 150 is compressed, only the first electrode lead 110 and the second electrode lead 120 are heated using the electrode leads tips 22 to 26. At this time, the first adhesive layer 151 of the portion of the insulating member 150 in contact with the first electrode lead 110 and the second electrode lead 120 may be melted at the melting temperature of the insulating member 150. It can be heated within a few seconds. For example, the first electrode lead 110 and the second electrode lead 120 are heated to 120 to 200 ° C. for 4 to 8 seconds.

Here, in the case of heating to a temperature lower than 120 ° C, further fusion of the insulating member 150 does not occur at the edge portion of the insulating member 150. On the other hand, when heated to a temperature higher than 200 ℃, the insulating member 150 is drawn to the first electrode lead 110 and the second electrode lead 120 side does not satisfy the size specifications.

In addition, when heating for less than 4 seconds, fusion of the insulating member 150 is not made sufficiently. On the other hand, when heating for a time longer than 8 seconds, productivity is lowered, the stretching of the insulating member 150 is increased to meet the size specification.

Referring to FIG. 16, as the first adhesive layer 151 of the insulating member 150 is fused, at least a portion of the space b between the insulating member 150 and the electrode leads 110 and 120 is fused to the first adhesive layer 151. Can be filled by). Therefore, the space between the insulating member 150 and the electrode leads 110 and 120 may be reduced or removed to a predetermined region (a).

Thereby, adhesive force can be improved, without the width | variety of the insulating member 150 extended. In addition, the insulating member 150 may be planarized as a whole to remove external defects. In addition, the airtightness between the electrode leads 110 and 120 and the insulating member 150 may be improved at both sides of the insulating member 150.

In this case, since the insulating member 150 extends to both sides of the first electrode lead 110 and the second electrode lead 120, sag may occur due to heating of the electrode leads 110 and 120 during the airtightness securing process.

In order to prevent this, the present invention uses the tips 27 for supporting the left and right sides of the insulating member 150. Referring to FIG. 17, the tip 27 for preventing sagging of the insulating member may have a concave shape having a receiving portion of the insulating member 150.

That is, the electrode leads 110 and 120 are heated in a state where the tip 27 for preventing sagging of the insulating member is disposed in the width direction of the insulating member 150. At this time, the sag-prevention tip 27 supports both sides 150a of the insulating member 150, and accommodates the electrode lead two-stage stacked structure so as to be in contact with the recess. Thereby, sagging of the width direction of the insulating member 150 can be prevented.

Optionally, upon application of the sagging prevention tip 27 of the insulating member, urethane or Teflon tape may be prevented from leaving marks on the insulating member 150 by the sagging preventing tip 27.

Meanwhile, the manufacturing method 200 of the electrode lead assembly for the secondary battery may further include adjusting the gloss of the insulating member (S260).

Here, since the insulating member 150 is formed in a film form, it generally has a gloss. At this time, since the alignment means used in the process is made of an optical element, when using the insulating member 150 having a gloss, the alignment error is likely to occur due to the reflection of light.

To prevent this, the present invention changes the insulating member 150 to matt or adjusts the glossiness. That is, after the fusion of the insulating member 150 is completed, the overall glossiness of the insulating member 150 may be selectively adjusted to be glossy or matte by additional fusion.

At this time, after the insulation member 150 is fused (step S250) or airtightness (step S250) process, the insulation member 150 may be completely adhered so that the heat of the electrode leads 110 and 120 may not come into contact with air as much as possible within a few seconds without cooling. By pressing with the crimping tip of the insulating member 150, the insulating member 150 can be adjusted to be matt. In addition, the insulating member 150 may be manufactured to be polished through natural cooling without additional sealing cooling such as a crimping tip.

In addition, when adjusting the glossiness of the insulating member 150 to a desired level, the gloss adjustment sheet may be separately attached to the upper and lower surfaces of the insulating member 150.

Referring to FIG. 18, the gloss adjustment sheet 30 is disposed on the upper and lower sides of the insulating member 150, and pressurized and heated by the pressure tips 28 and 29. Here, it is preferable that the gloss adjustment sheet 30 has elasticity so as to be in close contact with the insulating member 150 side.

At this time, the pressing tips 28 and 29 are heated to a temperature at which the height of the insulating member 150 is not changed, and the gloss adjusting sheet 30 is pressed at a predetermined pressure to closely adhere to the insulating member 150.

For example, the glossiness of the insulating member 150 may be adjusted by heating the pressing tips 28 and 29 at a pressure of 3 to 5 kgf / cm 2 for 4 to 8 seconds at 80 to 120 ° C.

Here, when pressurizing with a pressure smaller than 3 kgf / cm <2>, the glossiness adjusting sheet 30 is not fully crimped | bonded by the insulating member 150. FIG. On the other hand, when pressurized at a pressure greater than 5 kgf / cm 2, the insulation member 150 is deformed.

In addition, when heating to temperature less than 80 degreeC, the glossiness of the insulating member 150 by the glossiness adjusting sheet 30 is not fully expressed. On the other hand, when heated to a temperature higher than 120 ℃, the insulating member 150 is melted to deform the standard, such as height.

In addition, when it heats for less than 4 second, the glossiness of the insulating member 150 by the glossiness adjusting sheet 30 is not fully expressed. On the other hand, when heating for a time longer than 8 seconds, productivity is reduced, resulting in waste of resources by unnecessary heating.

By such a method. The present invention can improve the reliability of the product because it provides a current blocking function and leakage blocking of the electrolyte at the same time, can improve the resistance and adhesion while using the electrode lead of the two-stage structure, can shorten the work time Productivity can be improved, and since the airtightness with the insulating film can be ensured on both sides of an electrode lead, reliability of a product can be improved.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention may add components within the scope of the same idea. Other embodiments may be easily proposed by changing, deleting, adding, etc., but this will also fall within the scope of the present invention.

100: electrode lead assembly for a secondary battery
110: first electrode lead 120: second electrode lead
130: conductive adhesive layer 140: sealing member
150: insulation member

Claims (18)

A first electrode lead having one side connected to the electrode cell;
A second electrode lead disposed to face the first electrode lead to partially overlap the first electrode lead;
A conductive adhesive layer provided in an overlapping region between the first electrode lead and the second electrode lead;
A sealing member provided on the second electrode lead at the other end side of the first electrode lead; And
An insulating member disposed to surround the sealing member and the overlapping region, the insulating member being disposed between each of the first electrode lead and the second electrode lead and an inner surface of the pouch;
Including,
And the sealing member has an inclined surface to compensate for a step between the first electrode lead and the second electrode lead. The method of claim 1,
And an adhesive force between each of the first electrode lead and the second electrode lead and the conductive adhesive layer is smaller than the adhesive force between the insulating member and the sealing member. The method of claim 1,
The first electrode lead and the second electrode lead are provided with an electrolytic resistant coating layer at portions other than the overlapping region,
The width of the first electrode lead and the second electrode lead is the same,
And a length of the second electrode lead longer than that of the first electrode lead. The method of claim 3,
The ratio of the length of the second electrode lead to the length of the first electrode lead is 1: 3 to 1: 5,
The ratio of the area of the first electrode lead to the area of the overlap region is 1: 2 ~ 1: 4 for the electrode lead assembly for secondary batteries. The method of claim 1,
And the conductive adhesive layer has a volume resistivity of 10 ⁻³ Ω · cm or less. The method of claim 1,
The thickness of the sealing member is 110 to 115% of the thickness of the first electrode lead and the second electrode lead,
The sealing member is a secondary battery electrode lead assembly including the same material as the insulating member. The method of claim 1,
The bonding length between the sealing member and the second electrode lead is greater than the distance from one end of the second electrode lead to one end of the insulating member,
And a distance from one end of the second electrode lead to one end of the insulating member is 2 mm or less. The method of claim 1,
The thickness of the insulating member is a secondary electrode electrode lead assembly of 50 to 80% of the thickness of the first electrode lead and the second electrode lead. The method of claim 1,
The insulating member has a double or more laminated structure, and includes an insulating layer, a first adhesive layer and a second adhesive layer,
At least a part of the space between the overlapping region and the insulating member is filled by fusion of the first adhesive layer. The method of claim 1,
And the insulating member and the sealing member have a film shape. A first electrode lead having one side connected to the electrode cell;
A second electrode lead disposed to face the first electrode lead to partially overlap the first electrode lead;
A conductive adhesive layer provided in an overlapping region between the first electrode lead and the second electrode lead;
A sealing member provided on the second electrode lead at the other end side of the first electrode lead; And
And an insulating member disposed to surround the sealing member and the overlapping region, the insulating member being disposed between each of the first electrode lead and the second electrode lead and an inner surface of the pouch.
The sealing member has an inclined surface to compensate for the step between the first electrode lead and the second electrode lead,
And a first breaking force for the entire region provided with the sealing member is greater than a second breaking force for the entire region provided with the conductive adhesive layer. The method of claim 11,
And a third breaking force with respect to the entire area in which the insulating member is provided outside the sealing member and the conductive adhesive layer, is smaller than the second breaking force. Partially plating the portion of the first electrode lead and the second electrode lead with an electrolytic resistant coating layer at portions other than the overlapping region;
Bonding the first electrode lead and the second electrode lead by applying a conductive paste to the overlapping region between the first electrode lead and the second electrode lead;
Bonding a sealing member on the second electrode lead at the other end side of the first electrode lead; And
Bonding an insulating member to surround the sealing member and the overlapping region;
Including,
The sealing member is a manufacturing method of the electrode lead assembly for a secondary battery having an inclined surface to compensate for the step between the first electrode lead and the second electrode lead. The method of claim 13,
Heating the first electrode lead and the second electrode lead to 120 ° C. to 200 ° C. to partially fuse the insulation member to fill at least a portion of the space between the overlapping region and the insulation member. A method of making an electrode lead assembly. The method of claim 14,
After arranging the sheet for adjusting the gloss on the upper and lower sides of the insulating member, the step of adjusting the glossiness of the insulating member by heating at 80 ~ 120 ℃ for 4-8 seconds while pressing at a pressure of 3 ~ 5kgf / ㎠ Method of manufacturing an electrode lead assembly for a secondary battery comprising. The method of claim 13,
Bonding the electrode lead is coated with the conductive paste at a weight of 0.01 ~ 0.05mg / ㎜, heated to a temperature of 160 ~ 180 ℃ for 1 ~ 10 minutes while pressing at a pressure of 5 ~ 10kgf / ㎠ The manufacturing method of the electrode lead assembly for secondary batteries which hardens the said conductive paste. The method of claim 13,
Bonding the insulating member is a method of manufacturing an electrode lead assembly for a secondary battery for bonding the insulating member by heating for 4 to 8 seconds at a temperature of 120 ~ 180 ℃ while pressing at a pressure of 3 ~ 5kgf / ㎠. The method of claim 14,
Wherein the step of fusion welding secondary battery electrode lead assembly for supporting both sides of the insulating member with a pressing tip to prevent sagging of the insulating member.

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