KR20170110300A - Method for Manufacturing Battery Cell by Pre-Heating Electrode Lead - Google Patents

Abstract

The present invention provides a method for sealing a battery case with an electrode lead interposed therebetween by pressing and heating an electrode lead and an excess portion located in an outer periphery of an electrode assembly receiving portion formed in a battery case in a battery cell manufacturing process (a) preparing an electrode assembly having a separator structure sandwiched between an anode, a cathode, and an anode and a cathode; (b) Pre-heating the electrode leads connected to one end or both ends of the electrode assembly; (c) inserting the electrode assembly into the electrode assembly receiving portion of the battery case; (d) pressing and heating and sealing the outer peripheries of the outer periphery of the electrode assembly receiving part except for one outer periphery adjacent to the outer periphery where the electrode leads are located; (e) injecting an electrolyte into the battery case through the unsealed one-side outer periphery, and further sealing the unsealed one-side outer periphery; (f) performing a charging / discharging process of the electrode assembly, and removing gas generated in the charging / discharging process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pre-

The present invention relates to a method of manufacturing an electrode lead preheating type battery cell.

As information technology (IT) technology has developed remarkably, various portable information and communication devices have been spreading, so that the 21st century is being developed into a "ubiquitous society" capable of providing high quality information services regardless of time and place.

As a development base for such a ubiquitous society, a lithium secondary battery occupies an important position. Specifically, the rechargeable lithium secondary battery is widely used as an energy source for wireless mobile devices, and is proposed as a solution for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels And also as an energy source for electric vehicles, hybrid electric vehicles, and the like.

As described above, as the devices to which the lithium secondary battery is applied are diversified, the lithium secondary battery has been diversified to provide an appropriate output and capacity for the applied device. In addition, miniaturization is strongly demanded.

The lithium secondary battery may be classified into a cylindrical battery cell, a prismatic battery cell, and a pouch-shaped battery cell depending on its shape. Among them, a pouch-type battery cell which can be stacked with a high degree of integration, has a high energy density per unit weight, and is inexpensive and easy to deform is attracting much attention.

Fig. 1 schematically shows a typical structure of a typical pouch-shaped battery cell.

1, the battery cell 10 includes an electrode assembly 30 including a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrodes, and a positive electrode and a negative electrode The tabs 31 and 32 are welded to the two electrode leads 40 and 41 and sealed (sealed) so as to be exposed to the outside of the battery case 20.

The battery case 20 is made of a soft packaging material such as an aluminum laminate sheet and includes a case body 21 including a concave shaped storage portion 23 on which the electrode assembly 30 can be seated, And a lid 22 to which one side is connected.

The electrode assembly 30 used in the battery cell 10 may have a jelly roll structure or a stack / folding structure other than the stack structure as shown in FIG. In the stacked electrode assembly 30, a plurality of positive electrode tabs 31 and a plurality of negative electrode tabs 32 are welded to the electrode leads 40 and 41, respectively.

Such a battery cell has a structure in which the electrode lead and the battery case are pressed together and heated to seal the battery case. However, in the conventional process of bonding the electrode lead and the battery case, due to the volume and mass of the electrode lead, Since the rising rate is low, a temperature deviation occurs between the electrode lead and the battery case. If the temperature setting value of the sealing member for heating the electrode lead is increased to raise the temperature of the electrode lead sufficiently to the junction temperature, there may occur a problem that the battery case is damaged due to the heat input to the battery case, .

Accordingly, a battery cell manufacturing method capable of solving the above problems is very necessary.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

It is an object of the present invention to provide a method of manufacturing a battery cell capable of minimizing a temperature deviation between an electrode lead and a battery case in a process of sealing the battery case by pressing and heating the battery case and the electrode lead together .

According to an aspect of the present invention, there is provided a method of manufacturing a battery cell,

A method for sealing a battery case with an electrode lead interposed therebetween by pressing and heating together an electrode lead and an excess located in an outer periphery of an electrode assembly receiving portion formed in a battery case in a battery cell manufacturing process,

(a) preparing an electrode assembly having a separator structure sandwiched between an anode, a cathode, and an anode and a cathode;

(b) Pre-heating the electrode leads connected to one end or both ends of the electrode assembly;

(c) inserting the electrode assembly into the electrode assembly receiving portion of the battery case;

(d) pressing and heating and sealing the outer peripheries of the outer periphery of the electrode assembly receiving part except for one outer periphery adjacent to the outer periphery where the electrode leads are located;

(e) injecting an electrolyte into the battery case through the unsealed one-side outer periphery, and further sealing the unsealed one-side outer periphery;

(f) charging and discharging the electrode assembly, and removing gas generated during charging and discharging;

 As shown in FIG.

Accordingly, the method of manufacturing a battery cell according to the present invention includes a step of preheating an electrode lead connected to one end or both ends of the electrode assembly, thereby pressing and heating the battery case and the electrode lead together to seal the battery case The temperature difference between the electrode lead and the battery case can be minimized to prevent damage to the battery case.

In one embodiment of the present invention, in step (b), the electrode lead may be heated to a temperature ranging from 230 degrees Celsius to 270 degrees Celsius. When the electrode lead is heated to less than 230 deg. C, the electrode lead is not sufficiently heated so that the temperature deviation between the electrode lead and the battery case is sufficiently narrowed in joining and heating the electrode lead and the battery case together So that the temperature of the electrode lead is further increased to raise the temperature of the battery case, thereby raising the temperature of the battery case and damaging the battery case.

On the other hand, when the electrode lead is heated to a temperature higher than 270 deg. C, the electrode lead is excessively heated so that the electrode lead and the battery case are joined together and heated, A problem may occur that the battery case is touched and damaged.

In a state where the electrode lead is preheated, the electrode assembly may be embedded in the battery case within 1 to 3 seconds and the process of the step (d) may be performed. When the electrode assembly is embedded in the battery case within one second and the process of the step (d) is performed, the electrode lead may be in an over-temperature state, and the electrode lead and the battery case are joined and heated together The battery case may be damaged due to overheating of the electrode lead.

On the other hand, when the electrode assembly is built in the battery case for more than 3 seconds and the process of step (d) is performed, the temperature of the electrode lead can be lowered to a desired temperature or less, The temperature difference between the electrode lead and the battery case may not be sufficiently narrowed in the process of joining and heating the battery case together, and accordingly, when the temperature for heating the electrode lead is increased, May be damaged.

In the step (d), the outer periphery of the battery case and the electrode lead may be pressurized and heated to a temperature range of 180 ° C to 220 ° C and sealed. When the outer periphery of the battery case and the electrode lead are pressed and heated to a temperature range of less than 180 degrees Celsius, the outer periphery of the battery case and the electrode lead may not be sufficiently bonded.

On the other hand, when the outer periphery of the battery case and the electrode lead are pressurized and heated to a temperature range exceeding 220 degrees Celsius, the temperature of the battery case excessively increases, and the battery case may be damaged .

In one embodiment of the present invention, in the step (b), the electrode lead may be heated by irradiating laser light.

The laser light may be irradiated to the electrode lead in a size corresponding to the shape of the electrode lead in a plane. Therefore, it is possible to irradiate the laser light corresponding to the electrode leads of various shapes and sizes.

As a specific example, the irradiation surface of the laser light with respect to the electrode lead may be formed in a rectangular shape.

In the step (d), the outer periphery of the battery case and the electrode lead may be sealed and heated by a sealing die.

Specifically, the sealing die may have a shape corresponding to the outer periphery of the battery case on a plane, and may have a structure in which a portion in contact with the electrode lead on the vertical section is recessed by the protruding height of the electrode lead.

The sealing die is in close contact with the outer periphery of the battery case and the electrode leads without any empty space in the process of sealing the outer periphery of the battery case and the electrode leads. Thus, the battery case and the electrode leads are pressed And the bonding process can be easily performed by heating.

In the step (f), a gas pocket is formed by collecting the gas generated in the charging / discharging process on the unillustrated outer periphery of one side, and an opening is formed in the gas pocket so as to remove the gas inside the gas pocket As shown in FIG.

Further, in the step (f), the non-sealed one outer periphery may be further sealed adjacent to the electrode assembly receiving portion in a state where the opening is opened in the gas pocket, and the additional sealed outer periphery The gas pocket portion can be cut off and removed.

The battery cell may be a pouch-type battery. A pouch-type battery includes a positive electrode, a separator, and a negative electrode laminated electrode assembly embedded in a battery case in which an electrode assembly storing portion is formed together with an electrolyte, and a sealing surplus portion is formed on the outer periphery of the electrode assembly receiving portion by thermal welding And the like.

The electrode assembly may have a folding structure, a stacking structure, or a stacking / folding structure, or a lamination / stacking structure.

The electrode structures of the folding type, the stacking type, the stacking / folding type, and the lamination / stacking type will be described in detail as follows.

First, a unit cell of a folding structure can be produced by coating a mixture containing an electrode active material on each metal current collector, placing the separator sheet between a cathode and an anode in the form of a sheet dried and pressed, and winding .

The unit cells of the stacked structure are formed by coating each electrode collector with an electrode mixture, drying and pressing the separator, and separating the positive and negative plates with a predetermined size corresponding to the positive and negative plates, And then laminating them.

The unit cell of the stack / folding type structure includes two or more unit cells in which the anode and the cathode face each other and in which two or more electrode plates are stacked, and the unit cells are wound with at least one separating film in a non- Or by bending the separation film to a size of the unit cell and interposing it between the unit cells.

In some cases, the positive electrode and the negative electrode face each other, and one or more single electrode plates may be further included between any unit cells and / or an outer surface of the outermost unicell.

The unit cell may be an S-type unit cell in which the outermost electrode plates on both sides have the same electrode, and a D-type unit cell in which the outermost electrode plates on opposite sides have opposite electrodes.

The S type unit cell may be an SA type unit cell in which the outermost electrode plates on both sides are the anode, and an SA type unit cell in which the outermost electrode plates on both sides are the cathodes.

The unit cells of the lamination / stacked structure are obtained by coating each metal current collector with an electrode mixture, drying, pressing and cutting to a predetermined size, sequentially forming a negative electrode from the bottom, a separator, And a separator is laminated thereon.

The battery case may include a pouch-shaped case having a laminate structure including a metal layer and a resin layer.

As a specific example of the battery case, the battery case is made of a laminate sheet including a resin outer layer of excellent durability, a metal layer of barrier property, and a heat-fusible resin sealant layer, and the resin sealant layers are heat- .

Since the resin outer layer must have excellent resistance from the external environment, it is necessary to have a tensile strength and weather resistance higher than a predetermined level. In this respect, polyethylene terephthalate (PET) and stretched nylon film can be preferably used as the polymer resin of the outer resin layer.

The barrier metal layer may preferably be made of aluminum so as to exhibit a function of improving the strength of the battery case, in addition to a function of preventing foreign matter such as gas or moisture from leaking or leaking.

The resin sealant layer may preferably be a polyolefin resin having low heat absorbability (thermal adhesiveness), low hygroscopicity to suppress penetration of an electrolyte solution, and not being swollen or eroded by an electrolytic solution, Preferably, lead-free polypropylene (CPP) can be used.

The present invention also provides a battery cell manufactured by the battery cell manufacturing method.

The battery cell may be a lithium secondary battery, specifically, a lithium ion battery or a lithium ion polymer battery.

Generally, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

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

The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m and the thickness is generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The non-aqueous electrolyte solution containing a lithium salt is composed of a polar organic electrolyte and a lithium salt. As the electrolytic solution, a non-aqueous liquid electrolytic solution, an organic solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride, etc. are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

The present invention also provides a battery pack including at least one battery cell.

The present invention also provides a device including the battery pack as a power source.

The device may be selected from a cell phone, a wearable electronic device, a portable computer, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

As described above, the method of manufacturing a battery cell according to the present invention includes a step of preheating an electrode lead connected to one end or both ends of an electrode assembly, thereby pressing and heating the battery case and the electrode lead together, The temperature difference between the electrode lead and the battery case can be minimized in the process of sealing the case, thereby preventing damage to the battery case.

1 is an exploded view of a conventional pouch-shaped battery cell;
2 is a flowchart of a method of manufacturing a battery cell according to an embodiment of the present invention.
Figure 3 is a perspective view of the electrode assembly of process (a) of Figure 2;
Figure 4 is a perspective view of the preheated electrode lead of process (b) of Figure 2;
5 is a perspective view of the electrode assembly and the battery case of the process (c) of FIG. 2;
FIG. 6 is a side view of a battery case and an electrode lead that are sealed and pressurized in step (d) of FIG. 2; FIG.
7 is a perspective view of a battery cell in which electrolyte is injected in the process (e) of FIG.
FIG. 8 is a perspective view of a battery cell for removing gas generated in a charge / discharge process in the process (f) of FIG. 2;

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 2 is a flow chart of a method of manufacturing a battery cell according to an embodiment of the present invention. FIG. 3 is a perspective view of the electrode assembly of FIG. 5 is a schematic perspective view of the electrode assembly and the battery case of the process (c) of FIG. 2, and FIG. 6 is a perspective view of the electrode assembly of FIG. Fig. 7 is a perspective view of the battery cell in which the electrolyte is injected in the process (e) of Fig. 2, And FIG. 8 is a perspective view of a battery cell that removes gas generated in a charging / discharging process in the process (f) of FIG. 2.

Referring to FIG. 2 together with FIG. 3, in step (a), an electrode assembly 100 having a separator structure interposed between an anode, a cathode, and an anode is prepared (S100).

2, the electrode leads 110 connected to both ends of the electrode assembly 100 are preheated by the laser light of the laser device 900 in a next step (b) (S200) . In this process, the electrode lead 110 is heated to a temperature range of 250 degrees Celsius. When the heating temperature of the electrode lead 110 is less than 230 degrees Celsius, the electrode lead 110 is not sufficiently heated and the electrode lead 110 and the battery case 200 are joined together and heated, The temperature deviation between the battery cases 200 may not be sufficiently narrowed and the electrode leads 110 are further heated to raise the temperature of the battery case 200 at the time of temperature rise to damage the battery case 200 May occur.

On the other hand, when the electrode lead 110 is heated to a temperature higher than 270 deg. C, the electrode lead 110 is excessively heated so that the electrode lead 110 and the battery case 200 are joined and heated together, A problem may occur that the battery case 200 is damaged due to overheating of the lead 110.

Referring to FIG. 2 together with FIG. 5, in the next step (c), the electrode assembly 100 is attached to the electrode assembly 100 housing part 210 of the battery case 200 with the electrode lead 110 pre- (S300). In this process, the electrode assembly 100 is built in the battery case 200 after about two seconds have elapsed under the condition that the electrode lead 110 is preheated. When the electrode assembly 100 is embedded in the battery case 200 within one second, the electrode lead 110 may be in an overtemperature state, so that the electrode lead 110 and the battery case 200 are joined together, The battery case 200 may be damaged due to overheating of the electrode lead 110 during the heating process.

On the other hand, when the electrode assembly 100 is stored in the battery case 200 for more than 3 seconds, the temperature of the electrode lead 110 may be lowered to a desired temperature or less, The temperature deviation between the electrode lead 110 and the battery case 200 may not be sufficiently narrowed in the process of joining and heating the case 200 together and the electrode lead 110 may be further heated thereby, The temperature of the case 200 may also rise together with the result that the battery case 200 may be damaged.

Referring to FIG. 2 together with FIG. 6, in a next step (d), the battery case 200 and the electrode lead 110 are sealed and heated by a sealing die 800 (S400). The sealing die 800 has a shape corresponding to the outer periphery of the battery case 200 in a plan view and a portion 810 in contact with the electrode lead 110 on the vertical cross section is recessed by the protrusion height H of the electrode lead .

In this process, the outer periphery of the battery case 200 and the electrode lead 110 are pressurized, heated, and sealed to a temperature range of 200 degrees Celsius. When the outer periphery of the battery case 200 and the electrode leads 110 are pressed and heated in a temperature range of less than 180 degrees Celsius, the outer periphery of the battery case 200 and the electrode leads 110 may not be sufficiently bonded have.

On the other hand, when the outer periphery of the battery case 200 and the electrode leads 110 are pressed and heated to a temperature range exceeding 220 degrees Celsius, the temperature of the battery case 200 excessively increases, ) May be damaged.

Referring to FIG. 2 together with FIG. 7, in the next step (e), the electrolyte solution is injected into the battery case 200 through the unsealed one outer periphery 220 of the battery case 200, The surrounding is additionally sealed (S500).

Referring to FIG. 2 together with FIG. 8, in the next step (f), the electrode assembly 100 is charged and discharged, and the gas generated in the unillustrated outer periphery 220 is collected A gas pocket 230 is formed and an opening 231 is drilled into the gas pocket to remove the gas inside the gas pocket.

The unsealed portion 240 is further sealed adjacent to the electrode assembly receiving portion 210 in the state where the opening is opened in the gas pocket and further the portion of the gas pocket 230 is cut off based on the sealed portion (S600).

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (18)

A method for sealing a battery case with an electrode lead interposed therebetween by pressing and heating together an electrode lead and an excess located in an outer periphery of an electrode assembly receiving portion formed in a battery case in a battery cell manufacturing process,
(a) preparing an electrode assembly having a separator structure sandwiched between an anode, a cathode, and an anode and a cathode;
(b) Pre-heating the electrode leads connected to one end or both ends of the electrode assembly;
(c) inserting the electrode assembly into the electrode assembly receiving portion of the battery case;
(d) pressing and heating and sealing the outer peripheries of the outer periphery of the electrode assembly receiving part except for one outer periphery adjacent to the outer periphery where the electrode leads are located;
(e) injecting an electrolytic solution into the battery case through the unsealed one outer periphery and further sealing the unshielded one outer periphery;
(f) charging and discharging the electrode assembly, and removing gas generated during charging and discharging;
And forming a battery cell. The method according to claim 1, wherein the electrode lead is heated in a temperature range of 230 ° C to 270 ° C in the process (b). 3. The battery cell manufacturing method according to claim 2, wherein the electrode assembly is embedded in the battery case in 1 to 3 seconds (sec) with the electrode lead preheated, and the process of the step (d) Way. [4] The method of claim 3, wherein the outer periphery of the battery case and the electrode lead are sealed and heated to a temperature ranging from about 180 DEG C to about 220 DEG C in step (d). The method of claim 1, wherein the electrode lead is heated by irradiating laser light in the step (b). The method according to claim 5, wherein the laser beam is irradiated on the electrode lead with a size corresponding to a planar shape of the electrode lead. The method for manufacturing a battery cell according to claim 6, wherein the irradiation surface of the laser beam with respect to the electrode lead has a rectangular shape. The method according to claim 1, wherein the outer periphery of the battery case and the electrode leads are sealed and pressurized by a sealing die in step (d). The battery pack according to claim 8, wherein the sealing die has a shape corresponding to the outer periphery of the battery case on a plane, and a portion in contact with the electrode lead on the vertical section is recessed by the protruding height of the electrode lead Gt; The method as claimed in claim 1, wherein the step (f) further comprises: forming a gas pocket by collecting the gas generated in the charging / discharging process on the unsealed one side outer periphery, Further comprising the step of perforating the opening in the pocket. The battery cell manufacturing method according to claim 10, wherein, in the step (f), the non-sealed one outer periphery is further sealed adjacent to the electrode assembly receiving part in a state where the opening is opened in the gas pocket Way. The method of claim 11, wherein the step (f) further comprises cutting and removing the gas pocket portion based on the further sealed outer periphery. The method for manufacturing a battery cell according to claim 1, wherein the battery cell is a pouch type battery. 14. The method of claim 13, wherein the electrode assembly is a folding structure, a stacking structure, a stacking / folding structure, or a lamination / stacking structure. The battery cell manufacturing method according to claim 14, wherein the battery case is made of a laminate sheet including a resin outer layer, a barrier metal layer, and a heat-meltable resin sealant layer. A battery cell characterized by being manufactured by the method according to any one of claims 1 to 15. A battery pack comprising at least one battery cell according to claim 16. A device as claimed in claim 17 comprising a battery pack as a power source.

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