KR101802013B1 - Electrode assembly, second battery using the same and method of manufacturing the same - Google Patents

Abstract

The present invention relates to an electrode assembly having an open space, comprising: a first electrode (111) having a first opening (111a); A second electrode 112 having a second opening 112a formed therein; And a separation membrane 113 disposed between the first and second electrodes 111 and 112 and having a third opening 113a communicating the first opening 111a and the second opening 112a, The first unit unit 110 has a first opening 111a, a third opening 113a and a second opening 112a communicating with each other in the up and down direction, (101) is formed.

Description

[0001] The present invention relates to an electrode assembly, a secondary battery using the electrode assembly, and a method of manufacturing the same.

The present invention relates to an electrode assembly, a secondary battery using the same, and a method of manufacturing the same. More particularly, the present invention relates to an electrode assembly having upper and lower openings formed therein to facilitate loading of various circuits, and a secondary battery using the same. .

Generally, a battery is obtained by using a chemical or physical reaction to obtain electric energy. Such a chemical battery is divided into a primary battery and a secondary battery. That is, a secondary battery is called a primary battery, such as a manganese battery, an alkaline battery and a mercury battery, and a secondary battery, which is used as a primary battery and can be recharged after recharging or recharging.

This secondary battery is formed of a battery cell type in which a plurality of cells, that is, unit cells, are connected to each other in consideration of charge / discharge efficiency and current capacity. At present, the secondary battery has high energy density, light weight, high voltage, High-speed charging, and excellent life span.

On the other hand, details of the secondary battery are disclosed in Korean Patent Publication No. 10-2012-0061354.

1, the secondary battery 10 according to the related art includes an electrode assembly 30 in which an anode, a cathode, and a separator interposed therebetween are repeatedly stacked, a pouch 30 in which the electrode assembly 30 is accommodated, (Not shown), and an electrolyte (not shown) injected into the pouch 20.

Recently, miniaturization and slimming of electronic devices have resulted in smaller space for the electronic devices. Accordingly, miniaturization and slimming of secondary batteries have been demanded. However, as the structure of secondary batteries according to the prior art, There was a limit to the slimness.

Patent Publication No. 10-2012-0061354

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and an object of the present invention is to provide a mounting space which is vertically communicated and which can be downsized and slimmed as components of various circuits are loaded in the mounting space. Assembly, a secondary battery using the same, and a manufacturing method thereof.

As a means for solving the above-mentioned problems, the electrode assembly for a secondary battery according to the present invention includes: a first electrode 111 having a first opening 111a; A second electrode 112 having a second opening 112a formed therein; And a separation membrane 113 disposed between the first and second electrodes 111 and 112 and having a third opening 113a communicating the first opening 111a and the second opening 112a, The first unit unit 110 has a first opening 111a, a third opening 113a and a second opening 112a communicating with each other in the up and down direction, (101) may be formed. That is, an electrode assembly having an open space can be realized.

The first, second and third openings 111a, 112a and 1113a are respectively formed on the inner sides of the first and second electrodes 111 and 112 and the separation membrane 113, The second and third openings 111a, 112a and 113a may have the same shape and size. That is, the open space 101 may be formed in the same shape from the upper part to the lower part on the inside of the electrode assembly, thereby increasing the shape and strength of the electrode assembly.

A first electrode tab 111b is formed on the outer side of the first electrode 111 and a second electrode tab 112b is formed on the outer side of the second electrode 112. The first and second electrode tabs 112b, (111b) and (112b) can be drawn out in the same direction in the basic unit body (110).

A first electrode tab 111b 'is formed on the outer side of the first electrode 111, a second electrode tab 112b' is formed on the outer side of the second electrode 112, The two electrode tabs 111b 'and 112b' can be drawn out from the basic unit body 110 in both directions. That is, the positions of the electrode tabs can be variously formed.

A plurality of the basic unit bodies 110 are sequentially stacked by a separation film 120. The separation film 120 is formed by stacking a plurality of the first unit bodies 110, And the fourth opening 121 may have the same shape as that of the open space 101. That is, it is possible to realize an electrode assembly having an open space in which components can be stably stacked by connecting the open spaces of the basic unit body 110.

The first electrode may be an anode, and the second electrode may be a cathode and, of course, the opposite.

Meanwhile, the secondary battery according to the present invention includes an electrode assembly 100; A first electrode lead 210 connected to the first electrode tabs 111b of the electrode assembly 100 and a second electrode lead 220 connected to the second electrode tabs 112b, (200); And a pouch case 300 in which the electrode assembly 100 is hermetically sealed so that the leading end of the lead unit 200 is drawn out to the outside of the electrode assembly 100. The pouch case 300 includes an electrode assembly 100, A loading space 301 passing through the space 101 from the upper surface to the lower surface can be formed. That is, the size and thickness of the secondary battery can be made smaller and slimmer by loading various circuits in the loading space.

The pouch case 300 includes upper and lower pouches 310 and 320 that are respectively provided at upper and lower portions of the electrode assembly 100 to receive the electrode assembly 100 while being coupled to each other, The pouches 310 and 320 are formed with upper and lower mounting parts 311 and 321 corresponding to the open space 101 of the electrode assembly 100 and the upper and lower mounting parts 311 and 321, The loading space 301 is formed while the upper and lower loading units 311 and 321 are connected to each other through the open space 101 and the upper and lower loading units 311 and 321 are sealed along the rim surface. That is, the loading space can be formed in the pouch case through the open space of the electrode assembly.

The lead portion 200 may be bent toward the loading space and the leading end of the lead portion may be drawn out to the loading space. That is, it is possible to stably connect the various circuits loaded in the loading space with the lid part.

According to another aspect of the present invention, there is provided a method of manufacturing a secondary battery, comprising: forming first and second electrode sheets by applying first and second electrode active materials to a plurality of electrode current collectors having electrode tabs, (S10) forming an empty space having no active material at a predetermined interval when the electrode active material is applied; (S20) of manufacturing the basic unit sheet 10 through the separator sheet 13 between the first and second electrode sheets 11 and 12; (S30) cutting the space between the empty space and the empty space in the basic unit sheet, and cutting the empty space together to manufacture a basic unit body having an open space; A step (S40) of fabricating an electrode assembly by successively laminating the plurality of basic unit bodies while interposing the plurality of basic unit bodies on a separation film; (S50) welding the first and second electrode leads 210 and 220 to the first and second electrode tabs of the electrode assembly; And a step (S60) of fabricating a secondary battery by inserting the electrode assembly into the pouch case with the electrode lead drawn out to the outside, and molding a loading space passing through the open space inside the pouch case .

In operation S60, the electrode assembly is inserted into the pouch case while the electrode lead is extended to the outside, and the outer edge of the pouch case is sealed. (S62) pressing and sealing the upper and lower surfaces of the pouch case along the rim of the open space formed in the electrode assembly; And a step (S63) of cutting a center of an inner sealing portion of the pouch case formed by the step S62 to form a loading space communicating with the upper and lower sides. That is, the secondary battery having the loading space can be easily manufactured.

In the step S10, the electrode active material is applied to the electrode current collector through the roller portion, and the roller portions are rotatable in mutually corresponding directions with a predetermined distance therebetween. The electrode active material supplied during rotation passes through the electrode current collector And a pair of rollers for applying a pair of rollers to the outer circumferential surface of the pair of rollers. The pair of rollers may be provided on one side of the outer circumferential surface of the pair of rollers so as to form an empty space in the electrode current collector, . That is, since the active material is not applied to the portion where the loading space is located, waste of the active material can be prevented.

And a step (S70) of bending the electrode lead in the loading space direction and drawing the leading end of the electrode lead into the loading space after step S60, while in step S40, after opening the electrode assembly, And cutting the separation film so that the space is communicated.

According to the present invention, by implementing a secondary battery having a loading space, it is possible to make the secondary battery compact and slim by loading various circuits in the loading space, and the electronic device can be further downsized and slimmed by the secondary battery.

1 is a perspective view illustrating a secondary battery according to a related art;
FIG. 2 is an exploded perspective view showing a basic unit for a secondary battery according to the present invention. FIG.
3 is an assembled perspective view showing a basic unit body for a secondary battery according to the present invention.
4 is an assembled perspective view showing another embodiment of the basic unit body for a secondary battery according to the present invention.
5 is a cross-sectional view illustrating an electrode assembly for a secondary battery according to the present invention.
6 is a perspective view illustrating a secondary battery according to the present invention.
FIG. 7 is a sectional view of FIG. 6; FIG.
Fig. 8 is a view showing a state in which the lead portion is bent in Fig. 7; Fig.
9 is a flowchart showing a method of manufacturing a secondary battery according to the present invention.
10 to 20 are views showing a manufacturing process of a secondary battery according to the present invention. FIG. 10 is a view illustrating an electrode sheet manufactured by coating an active material so as to form an empty space in a current collector. FIG. 13 is a view for manufacturing a basic unit sheet, FIG. 14 is a view for manufacturing a basic unit, and FIG. 15 is a view for explaining the operation of the electrode assembly 18 is a view for sealing the inside of the secondary battery, Fig. 19 is a view for molding the loading space, and Fig. FIG. 20 is a view showing a secondary battery completed by bending the lead portion. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

[Basic unit body according to the first embodiment of the present invention]

2 and 3, the basic unit according to the present invention includes a first electrode 111 having a first opening 111a formed therein, a second electrode 111 provided below the first electrode 111, And a third opening 112a interposed between the first and second electrodes 111 and 112 and communicating the first opening 111a and the second opening 112a, Layer structure including a separation membrane 113 in which a portion 113a is formed.

That is, when the first electrode 111, the separation membrane 113, and the second electrode 112 are sequentially stacked, the basic unit body 110 has the first opening 111a, the third opening 113a, The opening portion 112a is vertically communicated to form an open space 101. The open space 101 can be utilized as a space for loading components such as various circuits.

The first, second, and third openings 111a, 112a, and 113a may be formed on the inner sides of the first electrode 111, the second electrode 112, and the separator 113, respectively. An open space 101 is formed in the upper surface of the base unit 110 so as to communicate with the upper surface of the base unit 110 and the outer shape of the first electrode 111, the second electrode 112 and the separation membrane 113 can be maintained.

On the other hand, the first, second and third openings 111a, 112a and 113a may have the same shape. 3, the first, second, and third openings 111a, 112a, and 113a may be formed in a rectangular frame shape, and the upper, A rectangular open space 101 can be realized.

Here, the first, second, and third openings 111a, 112a, and 113a are not limited to rectangular shapes, and may be triangular, circular, elliptical, and polygonal open spaces. That is, the open space can be designed according to the shape of the part to be loaded.

On the other hand, the first, second and third openings 111a, 112a and 113a may have the same size. 3, the first, second, and third openings 111a, 112a, and 113a may be formed to have the same size on the same vertical axis, It is possible to realize an open space 101 vertically up and down. That is, it is possible to stably load parts in the open space.

Meanwhile, the first electrode 111 may be an anode and the second electrode 112 may be a cathode. It could be the opposite, of course. That is, a basic unit in which an anode is disposed on the upper side can be realized. It is, of course, possible to implement a basic unit in which a cathode is disposed on the upper side. Thus, a basic unit having various laminated structures can be realized.

A first electrode tab 111b is formed on the outer side of the first electrode 111 and a second electrode tab 112b is formed on the outer side of the second electrode 112. [

Here, the first and second electrode tabs 111b and 112b may be drawn in the same direction in the basic unit 110 as shown in FIG. That is, the first and second electrode tabs 111b and 112b are drawn out in the same direction so that first and second electrode leads welded to the first and second electrode tabs 111b and 112b, respectively, It can be realized to be bent in the same direction and angle.

Meanwhile, in another embodiment of the present invention, the first and second electrode tabs 111b 'and 112b' may be drawn in both directions from the basic unit 110 'as shown in FIG. That is, the first and second electrode tabs 111b 'and 112b' are drawn out in both directions to form first and second electrode tabs 111b 'and 112b' that are welded to the first and second electrode tabs 111b 'and 112b' The two electrode leads (not shown) may be bent in mutually corresponding directions.

As described above, the secondary battery having various structures can be manufactured according to the drawing direction of the first and second electrode tabs 111a and 112a.

Accordingly, the basic unit body 110 according to the present invention is formed with an open space 101 communicating with the upper and lower sides, and can be utilized as a space for loading various parts such as various circuits through the open space 101.

The three-layer structure including the first electrode, the separation membrane, and the second electrode has been described as an example in the basic unit 110 according to the present invention. However, the three-layer structure including the first electrode, the separation membrane, A seven-layer structure including an electrode, a separator, and a second electrode may be applied, and such variations are also included in the scope of the present invention.

Meanwhile, the present invention can realize an electrode assembly including the basic unit body 110 and having an open space.

[Electrode assembly according to the second embodiment of the present invention]

5, the electrode assembly 100 according to the present invention has an open space formed therein. The electrode assembly 100 includes a basic unit body 110, a separation film 120 interposed between the plurality of basic unit bodies 110, May be included. Here, the separation film 120 may be formed with a fourth opening 121 so that the open space 101 of the stacked basic unit bodies 110 is communicated with the outside.

The basic unit 110 includes a first electrode 111 formed with a first opening 111a, a second electrode 112 provided below the first electrode 111 and having a second opening 112a, And a separation membrane 113 interposed between the first and second electrodes 111 and 112 and having a third opening 113a communicating the first opening 111a and the second opening 112a And has a three-layer structure.

Here, the first opening 111a, the third opening 113a, and the second opening 112a communicate with each other to form an open space 101.

The basic unit body 110 has the same configuration and function as the basic unit body 110 described in the first embodiment, and a detailed description thereof will be omitted.

The separator film 120 is for laminating a plurality of basic unit bodies 110 and is interposed between the basic unit bodies 110 when a plurality of basic unit bodies 110 are stacked. That is, the base unit bodies 110 are sequentially stacked with the separation film 120 interposed therebetween.

The separation film 120 may include a fourth opening 121 formed to allow the open space 101 of the stacked basic unit bodies 110 to communicate with the outside and an electrode assembly 100 may implement an open space communicating vertically.

On the other hand, the fourth opening 121 may have the same shape as the opening space 101. That is, the fourth opening 121 and the open space 101 may be formed in the same shape to form the open space 101 having the same vertical surface.

Meanwhile, in the embodiment of the present invention, the open spaces 101 of the basic unit bodies 110 sequentially stacked have been described as having the same shape and size, but the present invention is not limited thereto. For example, the open space 101 of the sequentially stacked basic unit bodies 110 may be gradually reduced in size from the upper portion to the lower portion of the electrode assembly 100, thereby realizing an open space having a multi-stage structure. Accordingly, a secondary battery having a multi-stage structure loading space can be realized through an open space having a multi-stage structure.

Accordingly, the electrode assembly 100 according to the present invention forms an open space 101 communicating with the top and bottom of the upper surface of the electrode assembly 100, and the components can be more stably loaded through the open space 101.

Meanwhile, the present invention may be embodied as a secondary battery having a loading space including the electrode assembly 100.

[Secondary Battery According to Third Embodiment of the Present Invention]

6 and 7, the secondary battery according to the present invention has a loading space communicating with the inside of the upper and lower portions. The secondary battery includes an electrode assembly 100, first electrode tabs 111b of the electrode assembly 100, A lead portion 200 having a first electrode lead 210 electrically connected to the first electrode tab 112b and a second electrode lead 220 electrically connected to the second electrode tabs 112b, And a pouch case 300 in which the electrode assembly 100 is hermetically sealed in a state in which the tip is drawn out. Meanwhile, an electrolyte solution (not shown) is injected into the pouch case 300 together with the electrode assembly 100.

The electrode assembly 100 includes a basic unit 110 and a separation film 120 interposed between the basic units 110 so that a plurality of basic unit bodies 110 are sequentially stacked, The fourth openings 121 are formed so that the open spaces 101 of the basic unit bodies 110 are communicated with the outside.

Meanwhile, the electrode assembly 100 has the same configuration and function as the electrode assembly described in the second embodiment, and a detailed description thereof will be omitted.

The pouch case 300 may include upper and lower pouches 310 and 320 which are respectively provided at upper and lower portions of the electrode assembly 100 and which receive the electrode assembly 100 while being coupled to each other.

Here, the pouch case 300 may be formed with a loading space 301 passing through the open space 101 of the electrode assembly 100 from the upper surface to the lower surface.

7, the upper and lower pouches 310 and 320 may have upper and lower mounting portions 311 (see FIG. 7), which communicate with the open space 101 of the electrode assembly 100 And the upper and lower loading sections 311 and 321 are connected to each other through the open space 101 to form a loading space 301.

That is, the secondary battery according to the present invention includes a loading space 301 through which the pouch case 300 passes from the upper surface to the lower surface thereof, and parts such as various circuits are loaded in the loading space 301, .

Meanwhile, the upper and lower mounting portions 311 and 321 may be sealed along the rim surface to be sealed. Thus, the sealing force and strength of the edge surfaces of the upper and lower mounting portions 311 and 321 can be increased to prevent leakage of the electrolyte solution.

8, the first and second electrode leads 210 and 220, which are the lead portions 200, are bent in a " C "shape toward the loading space to form the lead portions 200, So that the parts (not shown) loaded on the loading space 301 can be connected to the lead unit 200 more easily.

Hereinafter, a method of manufacturing a secondary battery according to the present invention will be described in detail with reference to the accompanying drawings.

[Method of manufacturing secondary battery according to the fourth embodiment of the present invention]

9, the first and second electrode sheet manufacturing steps S10, the basic unit sheet manufacturing step S20, the basic unit manufacturing step S30, The manufacturing step S40, the electrode lead welding step S50, the secondary battery manufacturing step S60, and the electrode lead bending step S70 may be included.

Here, the secondary battery manufacturing step S60 may include an electrode assembly receiving and sealing step S61, an inner sealing part forming step S62, and a loading space forming step S63.

Hereinafter, a method of manufacturing a secondary battery according to the present invention will be described in detail with reference to the accompanying drawings.

The first and second electrode sheet fabrication steps

As shown in FIG. 10, the first and second electrode sheet fabrication steps (S10) apply the first and second electrode active materials to a plurality of electrode current collectors 1 to be continuously transported, The first and second electrode sheets 11 and 12 are manufactured as shown. At this time, when the first and second electrode active materials are coated, void spaces 11a and 12a free of active material are formed at predetermined intervals, and the void spaces 11a and 12a are cut to form an open space.

On the other hand, electrode tabs are formed outside the electrode current collector 1 at predetermined intervals, and no active material is applied to the electrode tabs.

Here, in the first and second electrode sheet manufacturing steps (S10), the electrode active material is applied to the surface of the electrode current collector 1 through the roller portion 20, and the electrode active material is applied while forming a void space at predetermined intervals.

10 to 12, the roller units 20 are rotatable in mutually corresponding directions with a predetermined gap therebetween, and the roller unit 20 passes through the electrode active material during rotation to rotate the electrode current collector 1 A pair of rollers 21 and 22 to be applied and a main body 23 to which a pair of rollers 21 and 22 are rotatably mounted.

The pair of rollers 21 and 22 are provided with concave and convex portions 21a and 22a on one side of the corresponding outer circumferential surface respectively and the convex and concave portions 21a and 22a are formed by a pair of rollers 21 and 22, So that the electrode active material is prevented from passing therethrough while forming an empty space (1a) in the electrode current collector (1).

The roller unit 20 is rotated by a pair of rollers 21 and 22 in a direction corresponding to each other so that the active material passes through a space between the pair of rollers 21 and 22, (1). When the concave / convex pieces 21a and 22a formed on the pair of rollers 21 and 22 are in close contact with each other, a space between both ends of the pair of rollers 21 and 22 except for the convex / concave pieces 21a and 22a The active material is applied only to both ends of the electrode current collector 1 and an empty space 1a having no active material is formed thereon.

Therefore, in the first and second electrode sheet production steps (S10), the active material is applied while forming void spaces (1a) at predetermined intervals in the electrode current collector (1).

In this way, the first and second electrode sheets 11 and 12 having the empty spaces 11a and 12a can be manufactured.

On the other hand, when the first and second electrode sheet production steps S10 are completed, the basic unit sheet production step S20 is performed.

Basic monolith sheet manufacturing step

In the basic unit sheet production step S20, as shown in FIG. 13, the first and second electrode sheets 11 and 12 manufactured in step S10 are arranged up and down. At this time, the first and second electrode sheets 11 and 12 are arranged so that the empty space 1a of the first electrode sheet 11 and the empty space 1a of the second electrode sheet 12 are vertically aligned. .

Then, the basic unit sheet 10 is produced by laminating the first and second electrode sheets 11 and 12 with the separator sheet 13 interposed therebetween. At this time, heat is applied to the base unit sheet 10 in a state where the upper and lower surfaces are press-fitted to increase the bonding force of the first electrode sheet 11, the separation sheet 13, and the second electrode sheet 12. That is, the insulating layer coated on the separator sheet 13 has adhesive strength while the temperature rises, and the first electrode sheet 11 and the second electrode sheet 12 can be bonded to the separator sheet 13.

Therefore, the basic unit sheet production step (S20) can manufacture the basic unit sheet 10 having the empty space 1a.

On the other hand, when the basic unit sheet production step S20 is completed, a basic unit production step S30 is performed.

Basic Monomer Production Step

As shown in FIG. 14, the basic unit body manufacturing step S30 is for manufacturing a basic unit body having an open space. In the basic unit body sheet 10 manufactured in step S20, the empty space 1a and the empty space 1a Is cut in the width direction of the base unit sheet 10 to produce the base unit 110 while the empty space 1a is also cut to form the open space 101. [

Therefore, the basic unit body manufacturing step S30 can continuously produce the basic unit body 110 having the same lamination structure and the open space 101. [

On the other hand, when the basic unit manufacturing step S30 is completed, an electrode assembly manufacturing step S40 is performed.

Electrode assembly manufacturing step

As shown in FIG. 15, the electrode assembly manufacturing step S40 is for manufacturing an electrode assembly having an open space opened up and down. The electrode assembly manufacturing step S40 includes a step of forming a plurality of basic unit bodies 110 manufactured in step S30, So that the electrode assembly 100 is manufactured.

In this case, the plurality of basic unit bodies 110 stacked up and down are blocked by the separator film 120 in the open space 101. In order to communicate the open space 101 of the basic unit bodies 110, the separator film 120 ) Is further performed.

Therefore, the electrode assembly manufacturing step S40 is performed to manufacture the electrode assembly 100, cut the separator film 120 located in the open spaces 101 of the basic unit bodies 110, The electrode assembly 100 can be manufactured.

On the other hand, when the electrode assembly manufacturing step S40 is completed, the electrode lead welding step S50 is performed.

Electrode lead  Welding step

The electrode lead welding step S50 is a step of electrically connecting the first and second electrode tabs 111b and 112b of the electrode assembly 100 having the open space manufactured in step S40, The first and second electrode leads 210 and 220 are welded.

That is, the electrode lead welding step S50 welds the first and second electrode leads 210 and 220 for connecting the electrode assembly 100 to an external terminal (not shown).

On the other hand, when the electrode lead welding step S50 is completed, the secondary battery manufacturing step S60 is performed.

Secondary battery fabrication step

In the secondary battery manufacturing step S60, as shown in Figs. 17 to 19, the electrode assembly 100 manufactured in the step S50 is embedded in the pouch case 300. [ At this time, the electrode assembly 100 is inserted into the pouch case 300 in a state where the first and second electrode leads 210 and 220 are drawn out to the outside. Next, a secondary battery is formed inside the upper surface of the pouch case 300 to form a loading space 301 passing through the open space 101.

Hereinafter, the secondary battery manufacturing step (S60) will be described in more detail.

That is, the secondary battery manufacturing step S60 includes an electrode assembly receiving and sealing step S61, an inner sealing part forming step 62, and a loading space forming step S63.

The electrode assembly receiving and sealing step S61 includes receiving the electrode assembly 100 in the pouch case 300 with the electrode leads 210 and 220 drawn out to the outside as shown in FIG. The outer edge of the pouch case 300 is sealed to form the outer sealing portion 302, and the outer shape of the secondary battery can be manufactured.

18, the upper and lower surfaces of the pouch case 300 are sealed along the rim of the open space 101 of the electrode assembly 100 to form the inner sealing part (303), and an inner sealing portion (303) of a rectangular frame shape is formed thereon.

In the loading space forming step S63, as shown in Fig. 19, the pouch case 300 is placed in the lower press 4, and then the upper press 5 is lowered toward the lower press 4. [ Then, the upper press 5 is cut while passing through the center of the inner sealing portion 303, thereby forming the loading space 301 at the center of the inner sealing portion 303. [ Thus, a secondary battery having the completed loading space 301 can be manufactured.

On the other hand, when the secondary battery manufacturing step S60 is completed, the electrode lead bending step S70 is performed.

Electrode lead Bending step

The electrode lead bending step S70 is for easily connecting the electrode lead 210 (220) with the parts to be loaded in the loading space 301, as shown in Fig. 20, and the first and second The electrode leads 210 and 220 are bent 180 degrees in the direction of the loading space 301 so that the tip ends of the electrode leads 210 and 220 are drawn out in the loading space.

When the electrode lead bending step (S70) is completed in this way, the finished secondary battery can be completed.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: electrode assembly
110: basic unit
111: first electrode
111a: first opening
112: second electrode
112a:
113: Membrane
113a: third open portion
120: Separation film
121: fourth opening
200:
210: first electrode lead
220: second electrode lead
300: Pouch Case

Claims (17)

A first electrode 111 having a first opening 111a formed therein;
A second electrode 112 having a second opening 112a formed therein; And
A separation membrane 113 interposed between the first and second electrodes 111 and 112 and having a third opening 113a communicating the first opening 111a and the second opening 112a, (110) having a base portion
In the basic unit 110, the first space 111a, the third space 113a, and the second space 112a communicate with each other to form an open space 101,
A plurality of the basic unit bodies 110 are sequentially laminated by a separation film 120,
Wherein the separation film (120) is formed with a fourth opening (121) so that the open space (101) of the stacked basic units (110) is communicated with the outside. The method according to claim 1,
Wherein the first, second and third openings 111a, 112a and 1113a are formed inside the first and second electrodes 111 and 112 and the separator 113, respectively. Electrode assembly. The method according to claim 1,
Wherein the first, second, and third openings (111a), (112a), and (113a) have the same shape. The method according to claim 1,
Wherein the first, second and third openings (111a), (112a) and (113a) have the same size. The method according to claim 1,
A first electrode tab 111b is formed on the outer side of the first electrode 111 and a second electrode tab 112b is formed on the outer side of the second electrode 112,
Wherein the first and second electrode tabs (111b) and (112b) are drawn in the same direction in the basic unit body (110). delete The method according to claim 1,
Wherein the fourth opening (121) has the same shape as that of the open space (101). The method according to claim 1,
Wherein the first electrode is an anode and the second electrode is a cathode. An electrode assembly (100) provided by any one of claims 1 to 5, 7 and 8;
A first electrode lead 210 connected to the first electrode tabs 111b of the electrode assembly 100 and a second electrode lead 220 connected to the second electrode tabs 112b, (200);
And a pouch case 300 in which the electrode assembly 100 is hermetically sealed in a state that the tip of the lead unit 200 is drawn out to the outside,
Wherein the pouch case (300) is formed with a loading space (301) through the opening space (101) of the electrode assembly (100) from the upper surface to the lower surface. The method of claim 9,
The pouch case 300 includes upper and lower pouches 310 and 320 which are respectively provided at upper and lower portions of the electrode assembly 100 and receive the electrode assembly 100 while being coupled to each other,
The upper and lower pouches 310 and 320 are formed with upper and lower mounting parts 311 and 321 corresponding to the open space 101 of the electrode assembly 100,
Wherein the loading space (301) is formed while the upper and lower loading parts (311) and (321) are connected through the open space (101). The method of claim 10,
Wherein the upper and lower mounting portions (311) and (321) are sealed along the rim surface to be sealed. The method of claim 9,
Wherein the lead portion (200) is bent toward the loading space and the leading end of the lead portion is drawn out to the loading space. The first and second electrode sheets are manufactured by coating first and second electrode active materials on a plurality of electrode current collectors having electrode tabs formed thereon, (S10);
Fabricating a basic unit sheet 10 between the first and second electrode sheets via a separator sheet (S20);
(S30) cutting the space between the empty space and the empty space in the basic unit sheet, and cutting the empty space together to manufacture a basic unit body having an open space;
A step (S40) of fabricating an electrode assembly by successively laminating the plurality of basic unit bodies while interposing the plurality of basic unit bodies on a separation film;
(S50) welding the first and second electrode leads to the first and second electrode tabs of the electrode assembly;
And a step (S60) of fabricating a secondary battery by inserting the electrode assembly into the pouch case with the electrode lead drawn out to the outside, and molding a loading space passing through the open space inside the pouch case Wherein the secondary battery is manufactured by a method comprising the steps of: 14. The method of claim 13,
In operation S60, the electrode assembly is inserted into the pouch case while the electrode lead is extended to the outside, and the outer edge of the pouch case is sealed.
(S62) pressing and sealing the upper and lower surfaces of the pouch case along the rim of the open space formed in the electrode assembly; And
(S63) cutting the center of the inner sealing portion of the pouch case formed by the step S62 to form a loading space communicating with the upper and lower sides. 14. The method of claim 13,
In the step S10, the electrode active material is applied to the current collector through the roller,
Wherein the roller unit includes a pair of rollers rotatable in mutually corresponding directions spaced apart from each other by a predetermined distance and applying the electrode active material supplied during rotation to the electrode current collector,
Wherein a pair of rollers are provided on one side of the outer circumferential surface of the pair of rollers so as to be in close contact with each other when the pair of rollers are rotated, and to prevent the electrode active material from passing therethrough, thereby forming a hollow space in the electrode current collector. 14. The method of claim 13,
And a step (S70) of bending the electrode lead in the loading space direction and drawing the leading end of the electrode lead into the loading space after step S60. 14. The method of claim 13,
Wherein the step (S40) comprises cutting the separator film so that the open spaces of the unitary units are communicated after the electrode assembly is manufactured.

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