WO2018182386A2

WO2018182386A2 - Electrolyte injection device

Info

Publication number: WO2018182386A2
Application number: PCT/KR2018/003871
Authority: WO
Inventors: 윤진국; 신종훈
Original assignee: (주)이티에스
Priority date: 2017-03-31
Filing date: 2018-04-02
Publication date: 2018-10-04
Also published as: WO2018182386A3; KR20180111121A; CN110462882A

Abstract

The present invention relates to a secondary battery and, more particularly, to an electrolyte injection device for injecting an electrolyte into a pouch for sealing a secondary battery. Disclosed is an electrolyte injection device for a secondary battery (10) of a plate-like structure which comprises: a secondary battery cell (20) in which a first electrode sheet (13) and a second electrode sheet (14) are stacked alternately and a separator (12) is disposed between the second electrode sheet (13) and the second electrode sheet (14); and a pouch (11) for sealing the secondary battery cell (20) impregnated in an electrolyte, the electrolyte injection device comprising: a battery supporting part (100), installed to be movable up and down, in which at least one secondary battery (10) is loaded so that the normal of a plate surface is arranged horizontally with the upper side of the pouch (11) open; an upper housing (200), having an open lower side, which forms an internal space (S) sealed together with the battery supporting part (100) when the battery supporting part (100) is moved upward; a pressure control part (300) for converting the pressure of the internal space (S) between the atmospheric pressure and a preset vacuum pressure in a state where the battery supporting part (100) is moved upward and the internal space (S) is sealed; and at least one electrolyte injection part (410), installed in the upper housing (200), which includes at least one nozzle part (410) to be inserted into the secondary battery (10) when the battery supporting part (100) is moved upward, and injects an electrolyte when the pressure of the internal space (S) drops to the vacuum pressure.

Description

Electrolyte Injection Device

The present invention relates to a secondary battery, and more particularly, to an electrolyte injection device for injecting an electrolyte into a pouch for sealing a secondary battery.

In general, a chemical cell is composed of a pair of electrodes and an electrolyte of a positive electrode and a negative electrode, and the amount of energy that can be stored varies depending on the material of the electrode and the electrolyte.

These chemical cells are classified into a primary battery used only for one-time discharge because of a very slow charging reaction, and a secondary battery that can be reused through repeated charging and discharging.

Secondary batteries are applied to various technical fields throughout the industry. For example, secondary batteries are used as energy sources for advanced electronic devices such as wireless mobile devices, and air pollution of existing gasoline and diesel internal combustion engines using fossil fuels. It is also attracting attention as an energy source for hybrid electric vehicles, which is being proposed as a solution for this.

Secondary batteries are manufactured in various ways depending on the shape of the case housing the electrode assembly, and typical shapes include cylindrical, rectangular, and pouch types.

In general, the cylindrical secondary battery uses a cylindrical aluminum can, the rectangular secondary battery uses a rectangular aluminum can, and the pouch type secondary battery is sealed with a pouch in which a thin aluminum laminate film made of aluminum is used as a pack. It is relatively light in weight and excellent in stability and is widely used in recent years.

For example, a configuration of a pouch-type secondary battery includes a stack, which is an electrode assembly formed by interposing a separator, which is a separator between a negative electrode and a positive electrode, and an aluminum-laminated film by sealing the stack therein. The pouch is formed, and one end is connected to the stack, and the other end is exposed to the outside of the pouch and is composed of a plate-shaped negative electrode tab for inducing current to the outside.

On the other hand, the secondary battery is generally completed by injecting an electrolyte into a pouch in which a battery cell composed of a negative electrode, a positive electrode, and a separator interposed therebetween is sealed.

Here, the performance of the secondary battery is determined according to the impregnation state of the electrolyte injected into the pouch.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrolyte injection apparatus capable of greatly improving the performance of a secondary battery by recognizing the above trend and necessity, and evenly injecting electrolyte into a pouch.

The present invention was created to achieve the object of the present invention as described above, the present invention, the first electrode sheet 13 and the second electrode sheet 14 are alternately stacked with each other and the first electrode sheet 13 ) And a secondary battery cell 20 in which the separator 12 is positioned between the second electrode sheet 14 and a pouch 11 for sealing the secondary battery cell 20 impregnated with the electrolyte. As the electrolyte injection device of the secondary battery 10, at least one secondary battery 10 is loaded and the shanghai can be placed so that the normal of the plate surface is arranged in the horizontal direction with the secondary battery 10 having the upper side of the pouch 11 open. A battery support part 100 installed so as to be installed; An upper housing (200) which forms a closed inner space (S) together with the battery support part (100) when the lower side is opened and the battery support part (100) is moved upward; A pressure control part 300 which moves the battery support part 100 upward and converts the pressure of the internal space S between atmospheric pressure and a preset vacuum pressure in a state where the internal space S is closed; The pressure of the internal space S is installed in the upper housing 200 and includes one or more nozzle parts 410 inserted into the secondary battery 10 when the battery support part 100 is moved upward. Disclosed is an electrolyte injection device comprising one or more electrolyte injection units 400 for injecting electrolyte when the pressure is dropped to the vacuum pressure.

The battery support part 100 includes: a lower housing 110 in close contact with an edge end of the upper housing 200 to form the sealed inner space S; A support bracket 120 installed inside the lower housing 110 to insert a secondary battery 10 in a horizontal direction in a state in which a normal of a plate surface is inserted in an open state of an upper side of the pouch 11; It may include a lifting unit 130 for moving the lower housing 110 up and down.

The support bracket portion 120 includes a support member 123 fixed to the lower housing 110; A pair of brackets 121 installed at the support member 123 to support a plate surface of the secondary battery 10; It may include a pair of end support portion 122 is installed at a position corresponding to both ends of the secondary battery (10).

The bracket 121 and the end support portion 122, the lower end is in close contact with the secondary battery 10, it is preferable that the inner circumferential surface of the upper end portion is extended to the outside to facilitate the insertion of the secondary battery (10).

The electrolyte injection unit 400 is installed in the upper housing 200 and at least one nozzle unit 410 inserted into the secondary battery 10 when the battery support unit 100 is moved upward. ; An electrolyte storage unit 430 for receiving and storing a predetermined amount of electrolyte from the electrolyte supply device 450; It may include a valve unit 420 to selectively supply the electrolyte from the electrolyte storage unit 430 to the nozzle unit 410.

An end of the nozzle unit 410 may be bent to face the inner surface of the pouch 11.

In the electrolyte injection device according to the present invention, by lowering the pressure of the internal space in which the secondary battery is installed to a predetermined vacuum pressure state and then injecting the electrolyte into the pouch containing the battery cells, the electrolyte is evenly injected into the pouch to perform the performance of the secondary battery. There is an advantage that can be greatly improved.

Furthermore, in the electrolyte injection, a predetermined amount of electrolyte is stored in a reservoir, and the internal space in which the secondary battery is installed is lowered to a preset vacuum pressure, and then the electrolyte is injected into the pouch containing the battery cell. There is an advantage that can be accurately injected.

In addition, there is an advantage that the electrolyte injection can be more stably injected by supporting the secondary battery by inserting the plate surface of the secondary battery having the plate-like structure in a state where the upper side of the pouch is open in the support bracket so that the plate surface faces the horizontal direction.

In particular, since the upper side of the inner circumferential surface of the support bracket into which the secondary battery is inserted is extended, the secondary battery can be easily inserted to prevent malfunction of the apparatus.

1 is a perspective view showing an example of a secondary battery that is a target of an electrolyte injection device according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1.

3 is a cross-sectional view showing an electrolyte injection device according to the present invention.

4 is a cross-sectional view illustrating a state in which a battery support part is raised in the electrolyte injection device of FIG. 3.

5 and 6 are perspective views showing an example of the support bracket portion of the battery support portion of FIG.

7 is a side view of the support bracket of FIG. 5.

8 is a front view of the support bracket of FIG. 5.

9 is a conceptual diagram illustrating a configuration of an electrolyte injection unit of the electrolyte injection device of FIG. 3.

10 is a simplified pressure-operation time graph in operation of the electrolyte injection device of FIG. 3.

Hereinafter, an electrolyte injection apparatus according to the present invention will be described with reference to the accompanying drawings.

The electrolyte injection device according to the present invention, as shown in Figure 3 to 9, is a device for injecting the electrolyte into the secondary battery (10).

Here, the secondary battery 10 injected by the electrolyte injection device according to the present invention, as shown in Figs. 1 and 2, the first electrode sheet 13 and the second electrode sheet 14 are laminated alternately with each other. And a pouch 11 for sealing the secondary battery cell 20 in which the separator 12 is positioned between the first electrode sheet 13 and the second electrode sheet 14 and the secondary battery cell 20 impregnated in the electrolyte. It includes.

The first electrode sheet 13 and the second electrode sheet 14 are stacked alternately with each other and separated by the separator 12 therebetween, respectively, to form a positive electrode and a negative electrode of the secondary battery 10. The member may be formed of a metal sheet according to the electrode characteristics.

The separator 12 is a member interposed between the first electrode sheet 13 and the second electrode sheet 14, and preferably has a material having high wettability to the electrolyte and high chemical resistance.

The separator 12 may have various materials according to materials of the first electrode sheet 13 and the second electrode sheet 14 constituting the secondary battery 10, physical properties of the electrolyte, and the like.

The pouch 11 may be a member for sealing the secondary battery cell 20 impregnated with the electrolyte and may have various materials depending on the material of the first electrode sheet 13 and the second electrode sheet 14 and the properties of the electrolyte. have.

On the other hand, the pouch 11 is sealed after the electrolyte is injected by the electrolyte injection device according to the present invention in a state in which the secondary battery cell 20 is inserted and the upper side is opened and the remaining part is sealed.

In the electrolyte injection device according to the present invention, as shown in Figure 3 to 9, the secondary battery 10 is one or more secondary batteries so that the normal of the plate surface is arranged in a horizontal direction with the upper side of the pouch 11 is open. 10 and the battery support unit 100 is installed so that it is possible to move; An upper housing 200 which forms an inner space S sealed together with the battery support 100 when the lower side is opened to move the battery support 100 upward; A pressure control part 300 for moving the battery support part 100 upward to convert the pressure of the internal space S between atmospheric pressure and a predetermined vacuum pressure in a sealed state of the internal space S; Installed in the upper housing 200, when the battery support 100 is moved upward, the pressure of the internal space (S) including one or more nozzles 410 inserted into the secondary battery 10 is vacuum pressure It includes one or more electrolyte injection unit 400 for injecting the electrolyte when dropped.

The battery support part 100 may include at least one secondary battery 10 such that the normal of the plate surface is arranged in a horizontal direction, for example, the X-axis direction, with the secondary battery 10 having the upper side of the pouch 11 open. It is a structure installed to enable Shanghai-dong, and various configurations are possible.

Here, the secondary battery 10 supported by the battery support part 100 is supported after being inserted in a standing state with respect to the battery support part 100 for electrolyte injection while the pouch 11 is open before electrolyte injection.

For example, as illustrated in FIGS. 3 to 5, the battery support part 100 may have a lower housing 110 that is in close contact with an edge end of the upper housing 200 to form an enclosed inner space S. ; A support bracket 120 installed inside the lower housing 110 to insert the secondary battery 10 in a state in which the normal of the plate surface is horizontally inserted while the upper side of the pouch 11 is opened; It may include a lifting unit 130 for moving the lower housing 110 up and down.

The lower housing 110 is in close contact with the edge end of the upper housing 200 to form a sealed inner space (S) is possible in a variety of configurations.

For example, as shown in FIGS. 3 and 4, the lower housing 110 is configured to form an inner space S sealed together with the upper housing 200 in an upwardly raised state, and the upper housing It may be composed of a plate member in close contact with the edge end of the (200).

Here, the plate member may be provided with an O-ring for sealing the inner space (S) in the portion in close contact with the edge end of the upper housing (200).

The support bracket portion 120 is installed inside the lower housing 110 so that the secondary battery 10 is inserted into the normal of the plate surface in a horizontal direction in a state where the upper side of the pouch 11 is opened. This is possible.

For example, the support bracket portion 120 includes a support member 123 fixedly installed at the lower housing 110; A pair of brackets 121 installed at the support member 123 to support the plate surface of the secondary battery 10; It may include a pair of end support portion 122 is installed at positions corresponding to both ends of the secondary battery (10).

The support member 123 is configured to be fixed to the lower housing 110. When the standard of the secondary battery 10 is changed, the support bracket 120 is a lower housing 110 as one module so as to easily cope with it. It is preferred to be detachably installed.

For example, the support member 123 may have a plate shape that can be detachably coupled to the lower housing 110 of the plate structure.

The pair of brackets 121 are installed on the support member 123 to support the plate surface of the secondary battery 10, and thus may be variously configured according to the support structure of the secondary battery 10.

For example, the pair of brackets 121 may be installed as one or more members to face each other at intervals corresponding to the thickness of the secondary battery 10 to be inserted.

Specifically, the pair of brackets 121 may be formed of a plate-like member, as shown in FIGS. 5 and 6.

The pair of end support portions 122 are installed at positions corresponding to both ends of the secondary battery 10, and are preferably installed at a distance comparable to the Y-axis length of the secondary battery 10.

On the other hand, the pair of end support portions 122 may have interference with the electrode portion 19 of the secondary battery 10, in consideration of the position of the electrode portion 19 of the secondary battery 10. It is preferable to install so that interference with the electrode part 19 of 10) is excluded.

In addition, the bracket 121 and the end support portion 122, the lower end is in close contact with the secondary battery 10, it is preferable that the inner peripheral surface of the upper end is extended to facilitate the insertion of the secondary battery (10).

As a specific example, the bracket 121 and the end support portion 122, it is preferable that the inclined surface is extended to the outside as the upper surface is directed upward.

The lifting unit 130, as a configuration for moving the lower housing 110 up and down is possible in a variety of configurations, such as a linear moving device.

The upper housing 200 is configured to form an inner space S sealed together with the battery support part 100 when the lower side is opened and the battery support part 100 is moved upward.

For example, the upper housing 200 may have a rectangular parallelepiped shape when combined with the lower housing 110 so as to form an internal space S of the rectangular parallelepiped together with the lower housing 110.

The pressure control unit 300 is configured to convert the pressure of the internal space (S) between the atmospheric pressure and the predetermined vacuum pressure in a state in which the battery support unit 100 is moved upward and the internal space (S) is sealed is various configurations It is possible.

For example, the pressure controller 300 may include an exhaust pipe 211 connected to at least one of the upper housing 200 and the lower housing 110, for example, one or more exhaust ports 211 formed in the upper housing 200. It may be connected to the exhaust pipe 211 may include a vacuum pump 320 for converting the internal space (S) between the atmospheric pressure and the predetermined vacuum pressure.

The exhaust pipe 211 may be configured to connect the internal space S and the vacuum pump 320 to exhaust the internal space S to drop the pressure to a vacuum pressure in which electrolyte may be injected.

The vacuum pump 320 is connected to the exhaust pipe 211 and configured to convert the internal space S between atmospheric pressure and a predetermined vacuum pressure, and an appropriate vacuum pump may be selected in consideration of forming a preset vacuum pressure. have.

Meanwhile, at least a part of the electrolyte may be vaporized according to the vacuum pressure during the injection of the electrolyte, and the electrolyte vaporized to the outside may leak when the lower housing 110 is separated.

Accordingly, the pressure control unit 300 may include a gas injection unit (not shown) for injecting a gas such as an inert gas into the internal space S so as to discharge the vaporized electrolyte after the injection of the electrolyte into the pouch 11. It may further comprise.

The gas injection unit is configured to inject an inert gas or the like into the internal space S to discharge the vaporized electrolyte after the injection of the electrolyte into the pouch 11 before the separation of the lower housing 110 from the upper housing 200. Various configurations are possible.

The electrolyte injection unit 400 includes one or more nozzle units 410 installed in the upper housing 200 and inserted into the secondary battery 10 when the battery support unit 100 is moved upward. Thus, when the pressure in the internal space (S) is lowered to the vacuum pressure as the configuration to inject the electrolyte can be various configurations according to the electrolyte injection method.

For example, as illustrated in FIGS. 3, 4, and 9, the electrolyte injection unit 400 is installed in the upper housing 200 and the secondary battery 10 when the battery support unit 100 is moved upward. One or more nozzle portions 410 inserted into the interior of the nozzle; An electrolyte storage unit 430 for receiving and storing a predetermined amount of electrolyte from the electrolyte supply device 450; It may include a valve unit 420 for selectively supplying the electrolyte from the electrolyte storage unit 430 to the nozzle unit 410.

The at least one nozzle unit 410 is installed in the upper housing 200 and is inserted into the secondary battery 10 when the battery support unit 100 is moved upwards. It may have a suitable configuration depending on the like.

For example, the one or more nozzle units 410 may be disposed at an appropriate number at predetermined intervals so that the electrolyte may be uniformly impregnated to correspond to the left and right widths of the secondary battery 10, that is, the length in the Y-axis direction.

The one or more nozzle units 410 may be installed by various methods, such as being penetrated through the upper housing 200.

Meanwhile, when the electrolyte is introduced through the nozzle unit 410, the electrolyte may be scattered with a pressure difference, and thus, the electrolyte may be inserted into the pouch 11 of the secondary battery 10 at a sufficient depth.

In addition, in order to prevent the electrolyte from scattering due to the pressure difference when the electrolyte is introduced through the nozzle unit 410, at least some of the nozzle units 410 may be formed of the pouch 11 as illustrated in FIG. 8. It may be formed to be bent toward the inner peripheral surface.

The electrolyte storage unit 430 is configured to receive and store a predetermined amount of electrolyte from the electrolyte supply device 450 and may be configured in various ways.

In particular, the electrolyte storage unit 430 may be impregnated with the optimum amount of electrolyte in the secondary battery 10 by storing the optimum amount of the electrolyte in advance received from the electrolyte supply source 450 according to the specification of the secondary battery (10). .

The electrolyte supply source 450 is a configuration in which the electrolyte is stored in a large amount so that the electrolyte is supplied to the electrolyte storage unit 430 by the pump 440, and various materials may be configured as the storage tank such that the material is determined according to the properties of the electrolyte. .

The valve unit 420 is configured to selectively supply the electrolyte from the electrolyte storage unit 430 to the nozzle unit 410, and various configurations are possible.

For example, the valve unit 420 may open the flow passage connected to the nozzle unit 410 from the electrolyte storage unit 430 after the internal space S is dropped to a predetermined vacuum pressure, thereby storing the electrolyte storage unit 430. The electrolyte stored in the electrolyte is introduced into the pouch 11 of the secondary battery 10 through the nozzle unit 410.

On the other hand, the electrolyte injection unit 400, the electrolyte remaining in the nozzle unit 410 due to the change of the surrounding environment, although it is necessary to prevent the introduction of the electrolyte, such as unloading of the secondary electrode 10 after completion of the electrolyte injection nozzle It may be discharged from the unit 410.

Thus, the electrolyte injection unit 400, Suck back (not shown) is preferably additionally installed to prevent the electrolyte remaining in the nozzle unit 410.

The Seokbaek part is configured to prevent the electrolyte remaining in the nozzle unit 410 by flowing back the electrolyte remaining in the nozzle unit 410 after the discharge of the electrolyte through the nozzle unit 410 can be configured in various ways.

For example, in the process of closing after opening the flow path connected to the nozzle unit 410 from the electrolyte storage unit 430 in combination with the valve unit 420 by using a structure applied to the dispenser of cosmetics, etc. The electrolyte remaining in the nozzle unit 410 may be configured to back flow.

On the other hand, the injection process of the electrolyte by the electrolyte injection device having the configuration as described above are as follows.

As shown in FIG. 3, the battery support part 200 is lowered from the upper housing 200 and maintained in a separated state so that the secondary battery 10 for electrolyte injection can be loaded.

When the secondary battery 10 is inserted into the support bracket part 120 of the battery support part 200 by a transport robot (not shown), the battery support part 200 is moved upwards, as shown in FIG. As the 210 is in close contact with the upper housing 200, the internal space S including the secondary battery 10 is sealed.

In this case, the secondary battery 10 supported by the lower housing 210 also rises, and the nozzle unit 410 installed in the upper housing 200 is inserted into the pouch 11 of the secondary battery 10 to be electrolyte. This can be injected.

In particular, the insertion degree of the nozzle unit 410 is appropriately selected in consideration of the stability of the electrolyte injection.

When the close contact between the lower housing 210 and the upper housing 200 is completed, the pressure of the internal space S by the operation of the pressure control unit 300, as shown in FIG. Drop in vacuum.

At this time, the injection time and injection time of the electrolyte by the electrolyte injection unit 400 can be set through a test, etc., as shown in Figure 10, when the pressure of the internal space (S) reaches the vacuum pressure immediately Electrolyte injection can begin. Alternatively, the electrolyte injection may be started after a predetermined time elapses after the pressure in the inner space S reaches the vacuum pressure.

Meanwhile, after the electrolyte injection is completed, as shown in FIG. 10, the vacuum pressure state may be maintained for a predetermined time so that the electrolyte may be reliably impregnated into the secondary battery cell 20.

Here, after the electrolyte injection process is completed, a process of sealing the pouch 11 may be further performed.

At this time, at least one of the upper housing 200 and the lower housing 210, a separate sealing device for sealing the pouch 11 may be installed.

On the other hand, when the electrolyte injection process is completed, the pressure in the internal space (S) by the pressure control unit 300 is back to the atmospheric pressure.

In this case, the electrolyte may remain in the form of steam, and in order to remove the electrolyte, a harmless gas may be injected even if leaked to the outside such as an inert gas to increase the pressure in the internal space S.

On the other hand, when the pressure in the internal space (S) is elevated to atmospheric pressure, the battery support 200 is lowered and separated from the upper housing 200.

When the lowering of the battery support part 200 is completed, the secondary battery 10 in which the electrolyte injection is completed by the carrier robot is unloaded, and the electrolyte is loaded into the new secondary battery 10 to be injected.

Meanwhile, in the embodiment of the present invention, the upper housing 200 has been described as being separated by the movement of the lower housing 210 in a fixed state, but both the upper housing 200 and the lower housing 210 are moved relative to each other. Of course, only the upper housing 200 may be moved.

Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

Claims

The secondary battery cell in which the first electrode sheet 13 and the second electrode sheet 14 are alternately stacked with each other and the separator 12 is positioned between the first electrode sheet 13 and the second electrode sheet 14 ( As an electrolyte injection device of the secondary battery 10 having a plate-like structure and a pouch 11 for sealing the secondary battery cell 20 impregnated in the electrolyte, 20),

A battery support part 100 in which at least one secondary battery 10 is loaded so that the secondary battery 10 is arranged in a horizontal direction in a state in which the upper side of the pouch 11 is open;

An upper housing (200) which forms a closed inner space (S) together with the battery support part (100) when the lower side is opened and the battery support part (100) is moved upward;

A pressure control part 300 which moves the battery support part 100 upward and converts the pressure of the internal space S between atmospheric pressure and a preset vacuum pressure in a state where the internal space S is closed;

The pressure of the internal space S is installed in the upper housing 200 and includes one or more nozzle parts 410 inserted into the secondary battery 10 when the battery support part 100 is moved upward. Electrolyte injection device, characterized in that it comprises one or more electrolyte injection unit 400 for injecting the electrolyte when the drop in the vacuum pressure.
The method according to claim 1,

The battery support part 100,

A lower housing 110 in close contact with an edge end of the upper housing 200 to form the sealed inner space S;

A support bracket 120 installed inside the lower housing 110 to insert a secondary battery 10 in a horizontal direction in a state in which a normal of a plate surface is inserted in an open state of an upper side of the pouch 11;

Electrolyte injection device comprising a lifting unit 130 for moving the lower housing 110 up and down.
The method according to claim 2,

The support bracket portion 120,

A support member 123 fixedly installed at the lower housing 110;

A pair of brackets 121 installed at the support member 123 to support a plate surface of the secondary battery 10;

Electrolyte injection device, characterized in that it comprises a pair of end support portion 122 is installed at a position corresponding to both ends of the secondary battery (10).
The method according to claim 3,

The bracket 121 and the end support portion 122, the lower end is in close contact with the secondary battery 10, the electrolyte injection, characterized in that the inner peripheral surface of the upper end is extended to facilitate the insertion of the secondary battery 10 to the outside Device.
The method according to any one of claims 1 to 4,

The electrolyte injection unit 400,

At least one nozzle part 410 installed in the upper housing 200 and inserted into the secondary battery 10 when the battery support part 100 is moved upward;

An electrolyte storage unit 430 for receiving and storing a predetermined amount of electrolyte from the electrolyte supply device 450;

Electrolyte injection device comprising a valve unit 420 for selectively supplying the electrolyte from the electrolyte storage unit 430 to the nozzle unit (410).
The method according to claim 5,

An end of the nozzle portion 410, the electrolyte injection device, characterized in that formed to be bent toward the inner surface of the pouch (11).