KR101852790B1 - Device For Filling Electrolyte Comprising Evacuated Chamber and Filling Electrolyte Method Using the Same - Google Patents

Abstract

The present invention relates to an apparatus for injecting an electrolyte into a working battery cell having a structure in which an electrode assembly is mounted inside a pouch-shaped battery case having an electrode assembly housing part, the apparatus comprising: a nest on which at least one working battery cell is mounted; A vacuum chamber in which an inlet and an outlet are formed on one side or both sides to change the internal pressure; At least one electrolyte injector connected to a tank storing an electrolyte and having an injection nozzle for injecting an electrolyte; And at least one sealing member sealing the outer circumferential surface of the working battery cell.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for injecting an electrolyte solution including a vacuum chamber and an electrolyte injection method using the same,

The present invention relates to an electrolyte injection device including a vacuum chamber and an electrolyte injection method using the same.

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

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Recently, as a lithium secondary battery, a pouch-shaped battery having a structure in which a stacked or stacked / folded electrode assembly is embedded in a pouch-shaped battery case of an aluminum laminate sheet has been proposed as a lithium secondary battery because of its low manufacturing cost, small weight, It is attracting much attention and its usage is gradually increasing.

On the other hand, the lithium secondary battery has a structure in which an electrolyte solution containing a lithium salt is impregnated in an electrode assembly having a porous separator interposed between a positive electrode and a negative electrode coated with an active material on a current collector. The cathode active material is mainly composed of a lithium cobalt oxide, a lithium manganese oxide, a lithium nickel oxide, a lithium composite oxide and the like, and the anode active material is mainly composed of a carbon-based material. During charging, lithium ions of the positive electrode active material are released and inserted into the carbon layer of the negative electrode. In discharging, lithium ions of the negative electrode carbon layer are released and inserted into the positive electrode active material. At this time, the electrolyte moves lithium ions between the negative electrode and the positive electrode It acts as a medium to make.

Therefore, in order for the secondary battery including the above-mentioned electrode assemblies to have a high capacity and a high energy density and to maintain a long lifetime, the electrode assembly disposed inside the battery is completely impregnated with the electrolyte solution so that the electrode reaction between the electrodes can be actively performed When the electrode assembly is impregnated incompletely in the electrolyte solution, the reaction between the electrodes is not smooth, the resistance is increased, the output characteristics and the capacity of the battery are drastically lowered, thereby deteriorating the battery performance, shortening the life span, The battery is exposed to the risk of deterioration or explosion of the battery.

The electrolyte solution is introduced into the battery at the final stage of the production of the lithium secondary battery. In general, the electrolyte solution is a polar solvent having a polarity capable of effectively dissolving and dissociating the electrolyte salt, and is an aprotic solvent having no active hydrogen. These electrolytic solutions often have a high viscosity and surface tension due to extensive interactions within the electrolyte and are difficult to penetrate into an electrode assembly that is laminated at high density or wound in a laminated state and therefore requires a long time to impregnate the electrolyte .

In order to solve such a problem, studies have been conducted to improve the impregnability of the electrolyte by injecting an electrolyte into the secondary battery, placing the secondary battery in a chamber having a specific structure, and applying a vacuum For example, an electrolyte injection device and a method for repeating the process of applying vacuum in each of the chambers while the secondary cells move between a plurality of chambers in order to smoothly carry out the electrolyte injection process for a plurality of secondary cells Research is being conducted.

However, in the case of such an apparatus and method for injecting an electrolyte, an overflow of the electrolyte may occur during the movement of the plurality of secondary batteries in the chambers. Particularly, the pouch type secondary battery There is a problem that the electrolytic solution overflows when moving between the chambers, and the electrolytic solution overflows even in the process of injecting the electrolytic solution, and the equipment for applying the vacuum is very complicated and the need for additional members There is a problem that the equipment cost is increased.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

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.

The inventors of the present application have conducted intensive research and various experiments and have found that a structure capable of simultaneously applying a vacuum in one chamber, sealing an outer circumferential surface of a working battery cell, and injecting an electrolyte through a sealed outer circumferential surface It is possible to solve the phenomenon that the electrolytic solution overflows during the process of injecting and moving the electrolyte, and it is possible to reduce the time of the electrolyte injecting process and to improve the impregnability of the electrolyte solution And completed the present invention.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for injecting an electrolyte into a working battery cell having a structure in which an electrode assembly is mounted inside a pouch-

A nest to which one or more working battery cells are mounted;

A vacuum chamber in which an inlet and an outlet are formed on one side or both sides to change the internal pressure;

At least one electrolyte injector connected to a tank storing an electrolyte and having an injection nozzle for injecting an electrolyte; And

At least one sealing member sealing the outer circumferential surface of the working battery cell;

As shown in FIG.

As described above, in general, in order to smoothly perform the electrolyte injection process for a plurality of battery cells, an electrolyte injection method in which cells are moved between a plurality of chambers and vacuum is repeated in each chamber is repeated And the electrolyte is overflowed in the process of moving the battery cells between the chambers.

On the other hand, the apparatus for injecting an electrolyte according to the present invention has a structure in which vacuum is applied inside the chamber, the outer circumferential surface of the battery cell is sealed, and the electrolyte is injected through the sealed outer circumferential surface, It is possible to solve the phenomenon that the electrolytic solution overflows during the process and the movement process, and it is possible not only to reduce the time of the electrolyte injection process, but also to improve the electrolyte impregnability.

The battery cell according to the present invention can be suitably applied to a pouch-shaped battery cell in which an electrode assembly is embedded in a laminate sheet including a metal layer and a resin layer, and in one specific example, a pouch-shaped case of an aluminum laminate sheet .

Generally, the pouch-shaped battery cell is structured such that, for example, an electrode assembly is housed in a storage portion of a pouch-shaped battery case made of an aluminum laminate sheet. That is, the pouch-shaped battery cell has a laminated sheet in which a receiving portion for mounting an electrode assembly is formed, a separate sheet separated from the sheet in a state where the electrode assembly is mounted on the receiving portion, or a sheet extending therefrom, And then sealing it.

The laminate sheet may have a structure in which the electrode assembly receiving part is formed on one side or both sides of the upper and lower laminate sheets. That is, it is possible to use separate upper and lower laminate sheets separated from each other or to use one sheet to which one side of the upper and lower laminate sheets are connected. Such a pouch case forms a receiving portion by partially compressing a laminate sheet having a thickness of several tens to several hundreds of micrometers by a drawing process using a die and a punch.

In one specific example, the laminate sheet may have a structure in which an electrode assembly accommodating portion is formed in each of the lower and upper laminate sheets. In the pouch-shaped battery cell having such a structure, a phenomenon that the electrolytic solution overflows during movement between the chambers due to the curvature of the edge surface formed at the end portion of the housing portion occurs, and the phenomenon of overflow of the electrolytic solution continues in the process of injecting the electrolytic solution The electrolyte injection device of the present invention is preferably applied to a pouch-shaped battery cell having the above-described structure.

Also, the pouch-shaped battery case has a sealing part (outer circumferential surface sealing part) formed on the outer circumferential surface of the battery case so that the outer circumferential surface can be sealed when the electrode assembly is mounted on the electrode assembly receiving part, And a gas collecting pocket protruding outwardly is formed in one of the predetermined portions.

The working battery cell may have a structure in which electrode tabs protrude from one side or both sides of the working battery cell and one side adjacent to the position where the electrode tabs are positioned is mounted on the nest so as to be positioned in the upper direction with respect to the ground.

The battery cell having such a structure is, for example, a structure in which three outer circumferential surfaces, including a surface on which the electrode tab protrudes, are sealed, and one unsealed surface is mounted on the nest such that the one surface is positioned in the upper direction with respect to the paper surface, And a structure in which an electrolyte is injected through the remaining unsealed portion.

In the working battery cell according to the present invention, the electrolytic solution is injected in a state where the inside of the chamber is evacuated. It is preferable that the electrolytic solution is injected in a state where the tank storing the electrolytic solution is at atmospheric pressure for smooth injection.

In one specific example, the tank may be located outside the vacuum chamber, and the injection nozzle of the electrolyte injector may be operated to move from the tank to the inside of the vacuum chamber where the working battery cell is located.

In this structure, the vacuum chamber has a structure including a through-hole through which the injection nozzle penetrates to inject the electrolyte into the working battery cell located inside, so that the tank is positioned under the atmospheric pressure condition outside the vacuum chamber, A pressure difference is generated so that the electrolyte injection rate can be improved.

As described above, the working battery cell is mounted in the nest and positioned inside the vacuum chamber so that one unsealed surface is located in the upper direction with respect to the paper surface, and a part of the unsealed one surface is sealed, And the injection nozzle is inserted into the remaining portion to inject the electrolyte.

In this case, the sealing member located inside the vacuum chamber may have a structure capable of changing its position inside the vacuum chamber, and may be composed of two members each having a recessed groove for penetrating the injection nozzle.

The indentation groove may be formed of a structure in which an unshielded excess portion for introducing the injection nozzle is formed in the outer peripheral surface sealing process of the working battery cell and the injection nozzle is inserted into the unshielded portion to inject the electrolyte, , The primary sealing is performed at a portion excluding the unshielded excess portion, and the size of the portion for injecting the electrolyte can be minimized, so that overflow phenomenon during the electrolyte injection process can be prevented.

In other words, since the injection of the electrolyte solution is completed in a state in which the four faces of the working battery cell are sealed, except for the unshielded excess portion in which the injection nozzle can pass through the inside of the vacuum chamber, the working battery cell, It is possible to prevent the phenomenon that the electrolytic solution is overflowed even when it is moved as needed.

In addition, since the injection nozzle penetrates the sealing member through the indentation groove, it is preferable to use a material having a relatively high specific heat in order to prevent the injecting nozzle from melting due to the heat of the sealing member or being sealed to the battery case .

For reference, the battery cell may be a lithium ion battery, and the lithium ion battery is composed of a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte solution 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 < 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 and the like 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 method for injecting an electrolytic solution into a working battery cell using the electrolytic solution injecting apparatus,

 (a) positioning a nest equipped with a working battery cell inside a vacuum chamber;

(b) applying a vacuum through the inlet of the vacuum chamber;

(c) placing the electrolyte injector at the top of the vacuum chamber;

(d) sealing the outer peripheral surface of the working battery cell by the sealing member;

(e) injecting an electrolyte through the injection nozzle; And

(f) removing the internal vacuum through the outlet of the vacuum chamber, with the injection nozzle separating from the working battery cell;

And the electrolyte solution is injected into the electrolyte solution.

As described above, in the working battery cell in the process (a), the surfaces except the one surface for injecting the electrolyte are sealed in the outer circumferential surface sealing preliminary part, and the one surface without sealing is placed in the upper direction with respect to the ground And the sealing member is composed of two members each having a recessed groove for penetrating the injection nozzle.

In addition, the indentation groove has a structure in which an unshrouding residue for introducing the injection nozzle is formed in the process of sealing the outer circumference of the working battery cell, and the injection nozzle is inserted into the unshielding insert and the electrolyte is injected.

The working cell may further include a process of removing the working cell from the inside of the vacuum chamber after the step (f), and the process cell may be removed from the inside of the vacuum chamber And further sealing the outer circumferential surface of the working battery cell after the outer surface of the working battery cell is sealed. Thus, the working battery cell in which the four surfaces are completely sealed can be completed.

Also, in order to increase the electrolyte injection rate, the electrolyte injection process of the process (e) may be performed in a state where the tank of the electrolyte injector is normal pressure and a vacuum chamber is in a vacuum state.

The present invention can also provide a battery cell which is manufactured using the electrolyte injection device.

Further, it is possible to provide a device including the battery cell as a power source, wherein the device is a battery pack including a battery pack including a battery pack including a battery pack including a battery pack including a light electric vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, Can be selected.

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 apparatus for injecting an electrolyte according to the present invention has a structure in which vacuum is applied inside the chamber, the outer circumferential surface of the battery cell is sealed, and the electrolyte is injected through the sealed outer circumferential surface, It is possible to solve the phenomenon that the electrolytic solution is overflowed in the process of injecting the electrolyte solution and the electrolytic solution injecting process.

1 is a schematic view of an electrolyte injection device according to one embodiment of the present invention;
2 is a vertical sectional view of the electrolyte injection device of FIG. 1;
3 to 6 are schematic views illustrating a method of injecting an electrolyte according to an embodiment of the present invention;
7 is a schematic view of a working battery cell according to one embodiment of the present invention.

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. 1 is a schematic view of an electrolyte injection device according to one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of the electrolyte injection device of FIG.

Referring to these drawings, an electrolyte injector 100 according to the present invention includes a pair of processing units (not shown) having an electrode assembly (not shown) mounted inside a battery case having a structure in which an electrode assembly accommodating portion is formed in each of upper and lower laminate sheets A nest 120 to which the battery cell 110 is mounted and a vacuum chamber 130 in which an inlet 131 and an outlet 132 are formed at one side in order to change the internal pressure.

And a pair of electrolyte injectors 140 connected to the tank 141 in which the electrolytic solution is stored and including an injection nozzle 142 for injecting an electrolytic solution. The outer peripheral surface of the working battery cell 110 is sealed (Not shown).

The working battery cell 110 is mounted on the nest 120 such that three sealing portions of the four outer circumferential sealing portions of the outer circumferential surface are sealed and one outer circumferential surface thereof is located in the upper direction with respect to the paper surface, And the pockets 111 are formed to protrude outwardly.

2, the tank 141 of the electrolyte injector 140 is located outside the vacuum chamber 130, and the injection nozzle 142 of the electrolyte injector 140 discharges the processing gas And is moved to the inside of the vacuum chamber 130 where the battery cell 110 is located. At this time, the vacuum chamber 130 includes through-holes 133 (see FIG. 3) through which the injection nozzle 142 penetrates to inject the electrolyte into the working battery cell 110 located therein.

The sealing member 150 has a structure in which the position of the sealing member 150 can be changed within the vacuum chamber 130. As shown in the enlarged view of the sealing member 150 in FIG. 2, And the two members 151 and 152 are formed with indentation grooves 153 and 154 for penetrating the working battery cell 110. The two members 151 and 152 are formed to be sealed And is configured so as to be capable of changing its position in the center direction to which it is attached.

3 to 6 are schematic views illustrating an electrolyte injection method according to one embodiment of the present invention.

Referring to FIG. 3 together with FIG. 1, a process for positioning a nest 120 equipped with a processing battery cell 110 inside a vacuum chamber 130 is performed. At this time, (150) is structured such that it is moved in an upper direction so as not to interfere with positioning the nest (120) in the vacuum chamber (130).

After the nest 120 is positioned inside the vacuum chamber 130, a vacuum is applied to the inside of the vacuum chamber 130 through the inlet 131 to change the internal pressure. Next, as shown in FIG. 4 As shown in the figure, the electrolyte injector 140 is positioned at the upper end of the vacuum chamber 130, and the injection nozzle 142 is lowered.

Next, after the position of the sealing member 150 is moved to a position corresponding to the sealing predetermined portion of the working battery cell 110, the outer peripheral surface is sealed, and after the sealing is completed, as shown in FIG. 5 Likewise, the sealing member 150 is moved upward in the upper direction, and an electrolyte is injected into the working battery cell 110 through the injection nozzle 142.

6, after the electrolyte injection process, the position of the injection nozzle 142 is elevated to disengage the injection nozzle 142 from the processing cell 110, and the outlet (not shown) of the vacuum chamber 130 132 and removing the nest 120 from the inside of the vacuum chamber 130.

The working cell 110 having the electrolytic solution injected through the electrolyte injecting method shown in FIGS. 3 to 6 has a primary sealing part 113 which is not completely sealed at one end where the gas pocket part 111 is located And includes an unsealing residue 112 at a position where the injection nozzle 142 passes for the electrolyte injection.

7, the unshielded ingot 112 included in the primary sealing portion 113 of the working battery cell 110 is further sealed to form a completely sealed secondary sealing portion 114 To complete the working battery cell 110. [

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (19)

delete delete delete delete delete delete delete delete delete delete A working battery cell having a structure in which an electrode assembly is mounted inside a pouch-shaped battery case having an electrode assembly housing part,
(a) mounting a working battery cell sealed with an outer circumferential surface other than the upper surface on a nest, and positioning a nest equipped with the working battery cell inside a vacuum chamber in which an inlet and an outlet are formed;
(b) applying a vacuum to the inside of the vacuum chamber through the inlet of the vacuum chamber;
(c) placing an electrolyte injector connected to an electrolyte storage tank at an upper end of the vacuum chamber and having an electrolyte injection nozzle;
(d) two sealing members, each of which has a structure capable of changing its position inside the vacuum chamber and in which the indentation grooves are respectively formed, is moved to the unsealed upper outer circumferential surface of the working battery cell, Sealing the outer circumferential surface of the working battery cell except for the unshielded excess portion of the shape;
(e) inserting an injection nozzle through the unshielding excess portion and injecting an electrolyte through the injection nozzle;
(f) removing the internal vacuum through the outlet of the vacuum chamber, with the injection nozzle separating from the working battery cell;
(g) removing the working battery cell from the inside of the vacuum chamber, and further sealing the unshielded surplus portion of the working battery cell. delete delete delete delete delete 12. The method according to claim 11, wherein the step (e) of injecting the electrolyte is performed while the tank of the electrolyte injector is at atmospheric pressure and the vacuum chamber is at a vacuum. delete delete

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