WO2019225882A1 - Ensemble fil d'électrode pour batterie secondaire et son procédé de fabrication - Google Patents

Ensemble fil d'électrode pour batterie secondaire et son procédé de fabrication Download PDF

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Publication number
WO2019225882A1
WO2019225882A1 PCT/KR2019/005442 KR2019005442W WO2019225882A1 WO 2019225882 A1 WO2019225882 A1 WO 2019225882A1 KR 2019005442 W KR2019005442 W KR 2019005442W WO 2019225882 A1 WO2019225882 A1 WO 2019225882A1
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WIPO (PCT)
Prior art keywords
electrode lead
insulating member
electrode
sealing member
adhesive layer
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PCT/KR2019/005442
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English (en)
Korean (ko)
Inventor
정성헌
이병영
김현태
Original Assignee
(주)네패스디스플레이
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Publication of WO2019225882A1 publication Critical patent/WO2019225882A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • 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.
  • secondary batteries are used as driving power sources for portable wireless devices and electric vehicles.
  • especially lithium secondary batteries have long life and high energy density, and demand is rapidly increasing.
  • a lithium battery is made of a flexible material, its shape can be freely designed.
  • 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.
  • the pouch type secondary battery includes 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.
  • 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.
  • 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.
  • the electrode lead 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 of the electrode lead and the insulating film. It does not secure the electrolyte resistance.
  • an embodiment of the present invention is to provide a secondary battery electrode lead assembly 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.
  • 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 production efficiency by reducing the time required for the paste curing and film bonding process.
  • 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.
  • 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;
  • 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 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.
  • the first electrode lead and the second electrode lead is provided with an electrolytic resistant coating layer in a portion other than the overlap region, the width of the first electrode lead and the second electrode lead is the same, The length of the two-electrode lead may be longer than the length of the first electrode lead.
  • 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 overlapping region is 1: 2 to 1: 4.
  • the conductive adhesive layer may have a volume resistivity of 10 ⁇ 3 ⁇ ⁇ cm or less.
  • 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.
  • 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.
  • the thickness of the insulating member may be 50 to 80% of the thickness of the first electrode lead and the second electrode lead.
  • the insulating member has a double or more laminated structure, and includes an insulating layer, a first adhesive layer, and a second adhesive layer, and at least a part of a space between the overlapping region and the insulating member is formed of the first adhesive layer. Can be filled by fusion.
  • the insulating member and the sealing member may be formed in a film shape.
  • 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, 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.
  • 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 with respect to the entire area provided 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.
  • 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 to surround the sealing member and the overlapping region.
  • 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.
  • the manufacturing method of the electrode lead assembly for secondary batteries is 4-8 seconds at 80 ⁇ 120 °C while pressing the pressure of 3 ⁇ 5kgf / cm2 after arranging the gloss adjustment sheet on the upper and lower sides of the insulating member
  • the heating may further include adjusting the glossiness of the insulating member.
  • the step of bonding the electrode lead is the coating of the conductive paste with a weight of 0.01 ⁇ 0.05mg / mm, 1 ⁇ at a temperature of 160 ⁇ 180 °C while pressing at a pressure of 5 ⁇ 10kgf / cm2
  • the conductive paste may be cured by heating for 10 minutes.
  • the step of bonding the insulating member may be heated to a temperature of 120 ⁇ 180 °C for 4-8 seconds while pressing at a pressure of 3 ⁇ 5kgf / cm2 to bond the insulating member.
  • the step of fusion welding may support both sides of the insulating member with a crimping tip to prevent sagging of the insulating member.
  • 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.
  • 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 overlapping regions between the electrode leads.
  • the present invention can shorten the work time by adding pressure during paste curing or bonding process of each member, thereby improving productivity.
  • the airtightness between the electrode leads can be ensured between the insulating films and the reliability of the product can be improved.
  • FIG. 1 is a cross-sectional view illustrating a state in which an electrode lead assembly for a secondary battery according to an embodiment of the present invention is coupled to a pouch of a secondary battery;
  • FIG. 2 is a cross-sectional view illustrating a difference in breaking force of respective regions in FIG. 1;
  • FIG. 3 is a plan view of an electrode lead assembly for a secondary battery according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view taken along the X-ray of FIG.
  • FIG. 5 is a partially enlarged view of area A of FIG. 4;
  • FIG. 6 is a cross-sectional view taken along the line Y of FIG. 3;
  • FIG. 7 is a cross-sectional view illustrating a current blocking principle according to expansion of a secondary battery when overcharged in FIG. 1;
  • FIG. 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
  • FIG. 9 is a plan view showing a partially plated state of an electrode lead
  • FIG. 10 is a cross-sectional view showing a bonding state of an electrode lead
  • FIG. 11 is a sectional view showing a bonding state of a sealing member
  • FIG. 12 is a plan view showing a bonding state of an insulating member
  • FIG. 13 is a cross-sectional view showing a bonding state of an insulating member
  • FIG. 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
  • the electrode lead assembly 100 for a secondary battery 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.
  • the electrode lead assembly 100 for a secondary battery is to pull out an electrode from the electrode cell 12 in the pouch 11 to the outside in the pouch type secondary battery.
  • the electrode lead assembly 100 for a secondary battery has a function of preventing the electrolyte solution contained in the pouch 11 from leaking out.
  • the electrode lead assembly 100 for the secondary battery has a structure in which the first electrode lead 110 and the second electrode lead 120 are stacked in two stages, thereby having 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 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.
  • the second electrode lead 120 is disposed to overlap with a portion of the first electrode lead 110.
  • the first electrode lead 110 and the second electrode lead 120 may be made of metal.
  • 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.
  • 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.
  • 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.
  • 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.
  • the sealing member 140 is to improve the adhesive force between the electrode leads 110 and 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.
  • 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.
  • 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).
  • the adhesive force between each component as described above may be described as the breaking force for each region.
  • 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.
  • 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.
  • the second breaking force may have a size of 30 to 70% with respect to the first breaking force
  • the third breaking force may have a size of 0 to 30%.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the width of the overlapping region 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.
  • 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.
  • 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.
  • 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 inside the pouch 11 due to overcharge or the like, thereby lowering the reliability of the product.
  • 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.
  • the coating layers 112 and 122 may include nickel (Ni).
  • the first electrode lead 110 and the second electrode lead through the conductive adhesive layer 130 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.
  • the contact resistance is preferably minimized to be within 10% of the resistance of the first electrode lead.
  • the conductive adhesive layer 130 is preferably low in electrical conductivity.
  • the conductive adhesive layer 130 may have a volume resistivity of 10 ⁇ 3 ⁇ ⁇ cm or less to minimize contact resistance.
  • the electrical resistance between the first electrode lead 110 and the second electrode lead 120 is increased to prevent unnecessary power consumption and heat generation.
  • the thickness of the conductive adhesive layer 130 may be 20 ⁇ 100 ⁇ m.
  • the thickness of the conductive adhesive layer 130 is smaller than 20 ⁇ m, the adhesive force decreases and the contact resistance between the first electrode lead 110 and the second electrode lead 120 increases.
  • the thickness of the conductive adhesive layer 130 is greater than 100 ⁇ m, 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.
  • 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.
  • 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.
  • the sealing member 140 may include the same material as the insulating member 150. Thereby, adhesion of the sealing member 140 and the insulating member 150 is easy, and the adhesive force can be improved.
  • 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
  • the adhesion between the electrode leads 110 and 120 and the insulation member 150 by the sealing member 140 is greater than the adhesion between the first electrode lead 110 and the second electrode lead 120.
  • a break occurs first between the 110 and the second electrode lead 120 to cut off the current.
  • 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.
  • the sealing member 140 may have an inclined surface to compensate for a step between the first electrode lead 110 and the second electrode lead 120.
  • the width of the sealing member 140 may be equal to the width of the first electrode lead 110 and the second electrode lead 120.
  • 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.
  • 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.
  • the step compensation effect between the first electrode lead 110 and the second electrode lead 120 Can not provide. That is, the flatness of the electrode lead assembly 100 for secondary batteries is lowered, and thus the adhesive force between each of the first electrode lead 110 and the second electrode lead 120 and the inner surface of the pouch 11 is lowered.
  • 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.
  • 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 blocking 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 does not break even in the region corresponding to the distance W3 due to expansion inside the pouch 11 due to overcharge or the like.
  • the insulating member 150 may be made of an insulating and heat sealable material.
  • the insulating member 150 may be formed of any one or more material layers selected from polyimide (PI), polyprophylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and the like. Can be done.
  • 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.
  • 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.
  • the first adhesive layer 151 may be made of modified polypropylene to which maleic acid is added.
  • the second adhesive layer 153 may be made of a material having excellent adhesion with the pouch 11.
  • 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.
  • the insulating layer 152 may be formed in the form of a nonwoven fabric (polyolefin-based, such as polyflopropylene).
  • the insulating layer 152 may be made of high crystallized polypropylene (HCPP).
  • 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.
  • 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 on the first adhesive layer 151. Can be filled by fusion.
  • 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 removed to a predetermined region (a).
  • 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.
  • the airtightness between the insulating member 150 can be improved.
  • 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.
  • the step of the lead electrodes 110 and 120 during welding for bonding the insulating members 150 may be reduced. 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 deteriorated, resulting in insulation breakdown and leakage of the electrolyte during sealing of the pouch 11.
  • 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.
  • 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 adhesion strength can be improved. Can be.
  • 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, so that the first electrode lead 110 and the first electrode lead 110 may be formed.
  • the power applied from the outside through the second electrode lead 120 is cut off, and thus the current can be cut off.
  • the inner side of the pouch 11 is separated between the electrode leads 110 and 120 around 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. ) And adhesion may be maintained by the adhesive force of the insulating member 150.
  • 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.
  • 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).
  • first, partial plating of the first electrode lead 110 and the second electrode lead 120 is performed with the electrolytic coating layer on portions other than the overlapping regions facing each other (step). S210).
  • the first electrode lead 110 and the second electrode lead 120 may be made of metal having the same width and different lengths.
  • 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.
  • the length ratio of the second electrode lead 120 to the first electrode lead 110 may be 1: 3 to 1: 5.
  • the coating layer 112 may be formed by partial plating except for the 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 fully plated and the lower surface of the first electrode lead 110 may be partially plated.
  • the coating layer 122 may be formed by partially plating. That is, the lower surface of the second electrode lead 120 may be fully plated and the upper surface may be partially plated. At this time, the metal plate constituting the first electrode lead 110 and the second electrode lead 120 may be plated after masking the partial regions 110a and 120a.
  • 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.
  • the areas of the unplated portions 110a and 120a may be determined in consideration of workability while providing sufficient adhesive force between the first electrode lead 110 and the second electrode lead 120.
  • the ratio of the area of the unplated portion 110a to the total area of the first electrode lead 110 may be 1: 2 to 1: 4.
  • 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.
  • the coating layers 112 and 122 are for preventing oxidation of the first electrode lead 110 and the second electrode lead 120, resistance to the electrolyte, and adhesion to the insulating member 150.
  • first electrode lead 110 and the second electrode lead 120 may be surface treated to improve weldability for connection with the electrode cell 12 or the outside.
  • 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.
  • Step S220 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.
  • 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.
  • 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.
  • 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 ⁇ m after the curing process.
  • 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.
  • the conductive paste 130 may be formed of a material that provides a predetermined level of adhesion with the first electrode lead 110 and the second electrode lead 120 and minimizes contact resistance.
  • 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.
  • the conventional process of heating to a predetermined temperature for curing the conductive paste 130 takes a lot of time.
  • 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.
  • 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.
  • first electrode lead 110 and the second electrode lead 120 For example, while pressing the first electrode lead 110 and the second electrode lead 120 at a pressure of 5 ⁇ 10kgf / cm2 and heated for 1 to 10 minutes at a temperature of 160 ⁇ 180 °C conductive paste 130 Can be cured.
  • the heating temperature of the conductive paste 130 is less than 160 ° C.
  • the time required for the conductive paste 130 to cure increases to increase the work time and consequently decrease the fishability.
  • 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.
  • the heating time of the electrically conductive paste 130 is less than 1 minute, hardening of the electrically conductive paste 130 is not fully performed.
  • 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.
  • 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).
  • 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.
  • 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 fusion by heating.
  • the sealing member 140 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.
  • the sealing member 140 may be disposed above the second electrode lead 120 at the outer side of the first electrode lead 110.
  • the sealing member 140 is to improve the adhesive force between the electrode leads 110 and 120 and the insulating member 150.
  • 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.
  • 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.
  • the width of the sealing member 140 may be equal to the width of the first electrode lead 110 and the second electrode lead 120.
  • 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.
  • 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.
  • 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.
  • 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).
  • the insulating member 150 may have a width greater than the width of the first electrode lead 110 and the second electrode lead 120.
  • the insulating member 150 may satisfy a bonding force with the first electrode lead 110, the second electrode lead 120, and the pouch 11 at the same time, and may be a material having resistance to the electrolyte.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • pressure tips 21 to 26 having heaters are separately disposed on upper and lower portions of the insulating member 150 to be fused.
  • separate pressurizing 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.
  • each pressurizing tip 21 to 26 may individually adjust the temperature so that a temperature difference does not occur for each position.
  • the electrode leads tips 23 to 26 may be individually adjusted to adjust by the step difference between the electrode leads 110 and 120.
  • 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.
  • 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.
  • the flatness may not be uniformly formed by the step between the first electrode lead 110 and the second electrode lead 120.
  • 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.
  • 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.
  • the first electrode lead 110 and the second electrode lead 120 are heated to 120 to 200 ° C.
  • the fusion characteristics are lowered due to the nonuniformity of the temperature at the edge portion of the insulating member 150.
  • 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.
  • the method 200 of manufacturing an electrode lead assembly for a secondary battery may further include partially fusion bonding the insulating member (S250).
  • the insulation members 150 and the tips 21 to 26 on the electrode leads 110 and 120 are heated and pressed, 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.
  • 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 the 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.
  • the provisional section is the same as described with reference to step S240.
  • the insulation member 150 is compressed, only the first electrode lead 110 and the second electrode lead 120 are heated using the electrode tips 22 to 26.
  • the first electrode lead 110 and the second electrode lead 120 are heated to 120 to 200 ° C. for 4 to 8 seconds.
  • the space between the insulating member 150 and the electrode leads 110 and 120 may be reduced or removed to a predetermined region (a).
  • the insulating member 150 may be planarized as a whole to remove external defects.
  • 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.
  • 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.
  • the present invention uses a tip 27 for supporting the left and right sides of the insulating member 150.
  • the tip 27 for preventing sagging of the insulating member may have a concave shape having a receiving portion of the insulating member 150.
  • the electrode leads 110 and 120 are heated while the tip 27 for preventing sagging of the insulating member is disposed in the width direction of the insulating member 150.
  • 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 not to contact the recessed portion. Thereby, sagging of the width direction of the insulating member 150 can be prevented.
  • urethane or Teflon tape can be prevented from leaving marks on the insulating member 150 by the sagging preventing tip 27.
  • the manufacturing method 200 of the electrode lead assembly for the secondary battery may further include adjusting the gloss of the insulating member (S260).
  • the insulating member 150 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.
  • 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.
  • the insulating member 150 may be intimately contacted with air as much as possible within a few seconds after the heat of the electrode leads 110 and 120 has not cooled.
  • the insulating member 150 can be adjusted to be matt.
  • the insulating member 150 may be manufactured to be polished through natural cooling without additional sealing cooling such as a pressing tip.
  • the gloss adjustment sheet may be separately attached to the upper and lower surfaces of the insulating member 150.
  • 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.
  • the gloss adjustment sheet 30 has elasticity so as to be completely in contact with the insulating member 150 side.
  • the pressing tips 28 and 29 are heated to a temperature at which the height of the insulating member 150 does not change, and the gloss adjusting sheet 30 is pressed at a predetermined pressure to closely adhere to the insulating member 150.
  • 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.
  • the glossiness of the insulating member 150 by the glossiness adjusting sheet 30 is not fully expressed.
  • the insulating member 150 is melted to deform the standard, such as height.
  • the present invention can improve the reliability of the product by providing a current blocking function and leakage blocking of the electrolyte at the same time, and can improve the resistance and adhesion while using the electrode lead of the two-stage structure, can shorten the time required for work Productivity can be improved, and since the airtightness with an insulating film can be ensured on both sides of an electrode lead, reliability of a product can be improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne un ensemble fil d'électrode pour une batterie secondaire et son procédé de fabrication. Un ensemble fil d'électrode pour une batterie secondaire selon un mode de réalisation de la présente invention comprend : un premier fil d'électrode ayant un côté connecté à une cellule d'électrode ; un second fil d'électrode disposé à l'opposé du premier fil d'électrode pour chevaucher partiellement le premier fil d'électrode ; une couche adhésive conductrice disposée dans une zone de chevauchement entre le premier fil d'électrode et le second fil d'électrode ; un élément d'étanchéité disposé sur le second fil d'électrode au niveau de l'extrémité de l'autre côté du premier fil d'électrode ; et un élément isolant disposé de façon à entourer l'élément d'étanchéité et la zone de chevauchement et disposé entre une surface interne d'une poche et le premier fil d'électrode et le second fil d'électrode.
PCT/KR2019/005442 2018-05-25 2019-05-08 Ensemble fil d'électrode pour batterie secondaire et son procédé de fabrication WO2019225882A1 (fr)

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KR1020180059543A KR102083162B1 (ko) 2018-05-25 2018-05-25 이차 전지용 전극 리드 조립체 및 그의 제조 방법

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