KR102666731B1 - Electrode Assembly, The Apparatus For Manufacturing The Same And The Method For Manufacturing The Same - Google Patents

Abstract

An electrode assembly manufacturing apparatus according to an embodiment of the present invention includes an electrode supply unit provided with an electrode sheet on which a plurality of electrodes are formed; A separator supply unit that folds when the electrode is seated and is provided with a separator sheet that covers the electrode and is stacked with the electrode; a table seating the electrodes on a top surface with the separator sheet folded between the electrodes to form the electrode assembly; A separator guide that guides the folding direction of the separator sheet; a pair of applicators for applying adhesive to at least a portion of the separator sheet and/or the electrode seated on the table; and a pair of pressure rollers that press the separator sheet guided from the separator guide.

Description

Electrode assembly, apparatus for manufacturing the same, and method for manufacturing the same {Electrode Assembly, The Apparatus For Manufacturing The Same And The Method For Manufacturing The Same}

The present invention relates to an electrode assembly, an apparatus for manufacturing the same, and a method for manufacturing the same. More specifically, it is an electrode assembly in which an electrode and a separator sheet are stacked in a Z-folding manner, wherein the electrode can be prevented from leaving its original position. It relates to an electrode assembly, an apparatus for manufacturing the same, and a method for manufacturing the same.

Generally, types of secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, lithium ion batteries, and lithium ion polymer batteries. These secondary batteries are used not only for small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, portable game devices, power tools, and e-bikes, but also for large products requiring high output such as electric vehicles and hybrid vehicles, as well as for surplus power generation. It is also applied and used in power storage devices that store power or renewable energy and backup power storage devices.

To manufacture such a secondary battery, an electrode active material slurry is first applied to a positive electrode current collector and a negative electrode current collector to manufacture a positive electrode and a negative electrode, and these are stacked on both sides of a separator to form an electrode assembly of a predetermined shape. Then, the electrode assembly is stored in the battery case, and the electrolyte is injected and sealed.

Electrode assemblies are classified into various types. For example, the simple stack type is to simply stack the anode, separator, and cathode by alternating them instead of manufacturing the unit cell. First, the unit cell is manufactured using the anode, separator, and cathode, and then these unit cells are Lamination & Stack Type (L&S), where multiple unit cells are spaced apart and attached to one side of a separator sheet that is long on one side, and the separator sheet is repeatedly folded from one end in the same direction. Type (S&F, Stack & Folding Type), a plurality of electrodes or unit cells are alternately attached to one side and the other side of a separator sheet that is long on one side, and the separator sheet is folded in a specific direction from one end and then folded in the opposite direction. There is a Z-Folding Type that repeats the method alternately. Among these, the Z-folding type has been frequently used recently due to its high degree of alignment and impregnation with electrolyte.

However, in the past, a separate laminating process was not performed after stacking the electrode and the separator sheet in this Z-folding type, so there was a problem in which the electrode and the separator sheet were not adhered to each other, causing the electrode to deviate from its original position. To solve this problem, a separate laminating process was performed after stacking the electrodes and separator sheets. However, since the overall thickness of the laminate with the electrodes and separator sheets has increased, heat is not transmitted to the inside of the laminate, resulting in poor adhesion. There was a problem with deterioration. Additionally, in order to perform this separate laminating process, there was a problem in which the electrodes were moved out of their original positions during the process of transporting the laminate. This problem became more severe when the adhesive strength of the separator sheet itself was low, depending on the material of the separator sheet.

Accordingly, there is a need to develop an electrode assembly including a Z-folding type electrode assembly with improved battery cell performance while preventing the electrode from moving out of position, a manufacturing device thereof, and a manufacturing method thereof.

The problem to be solved by the present invention is to provide an electrode assembly in which an electrode and a separator sheet are stacked in a Z-folding manner, and an electrode assembly that can prevent the electrode from leaving its position, an apparatus for manufacturing the same, and a method for manufacturing the same. It is done.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and problems not mentioned can be clearly understood by those skilled in the art from this specification and the attached drawings. .

An electrode assembly manufacturing apparatus according to an embodiment of the present invention includes an electrode supply unit provided with an electrode sheet on which a plurality of electrodes are formed; A separator supply unit that folds when the electrode is seated and is provided with a separator sheet that covers the electrode and is stacked with the electrode; a table seating the electrodes on a top surface with the separator sheet folded between the electrodes to form the electrode assembly; A separator guide that guides the folding direction of the separator sheet; a pair of applicators for applying adhesive to at least a portion of the separator sheet and/or the electrode seated on the table; and a pair of pressure rollers that press the separator sheet guided from the separator guide.

The pair of pressure rollers may be located between the table and the separator guide.

The electrode supply unit includes: a first electrode supply unit provided with a first electrode sheet on which a plurality of first electrodes are formed; And it may include a second electrode supply unit provided with a second electrode sheet on which a plurality of second electrodes are formed.

The electrode assembly manufacturing apparatus includes: a first transfer device that transfers the first electrode toward the table; And it may further include a second transfer device that transfers the second electrode toward the table.

The pair of applicators include a first nozzle and a second nozzle, and the pair of applicators can respectively apply adhesive to the separator sheet or the electrode located on the table.

The first nozzle and the second nozzle may be disposed on both sides with the separator guide interposed therebetween.

The pair of pressure rollers includes a first pressure roller and a second pressure roller, the first pressure roller is located between the first nozzle and the separator guide, and the second pressure roller is located between the second nozzle and the separator guide. It may be located between the separator guides.

The first electrode may be seated on a first area of the separator sheet, and the second electrode may be seated on a second area of the separator sheet.

a first header that adsorbs the first electrode and seats it in the first area; And it may further include a second header that adsorbs the second electrode and seats it in the second area.

The separator guide, the pair of applicators, and the pair of pressure rollers are fixed, and the table can linearly reciprocate toward the first transfer device and the second transfer device.

The table is fixed, and the separator guide, the pair of applicators, and the pair of pressure rollers can linearly reciprocate toward the first transfer device and the second transfer device.

The electrode assembly manufacturing apparatus may further include a moving box accommodating the separator guide and the pair of applicators therein.

A method of manufacturing an electrode assembly according to another embodiment of the present invention includes cutting a first electrode sheet provided from a first electrode supply unit to form a plurality of first electrodes; A separator sheet provided from a separator supply unit is guided along a separator guide, the separator sheet is seated on a table with a first pressure roller pressing the separator sheet guided from the separator guide, and a first area of the separator sheet Applying adhesive by a first nozzle to; Seating the first electrode on the first area of the separator sheet; Applying adhesive by a first nozzle to the top of the first electrode; and folding the separator sheet in a folding direction guided by the separator guide, so that the second area of the separator sheet covers the first electrode.

After covering the top of the first electrode, cutting the second electrode sheet supplied from the second electrode supply unit to form a plurality of second electrodes; A second nozzle applying adhesive to a second area of the separator sheet while a second pressure roller presses the separator sheet guided from the separator guide; Seating the second electrode on the second area of the separator sheet; applying adhesive to the top of the second electrode using the second nozzle; And the step of folding the separator sheet in a folding direction guided by the separator guide, so that the first area of the separator sheet covers the second electrode.

The separator guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are fixed, and the table can linearly reciprocate toward the first transfer device and the second transfer device. there is.

The table is fixed, and the separator guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller can reciprocate in a straight line toward the first transfer device and the second transfer device. there is.

An electrode assembly in which electrodes and separator sheets are alternately stacked according to another embodiment of the present invention, wherein the electrode includes a first electrode and a second electrode, and the separator sheet has a zigzag shape formed by folding at least twice. wherein the separator sheet is folded with the first electrode seated on the first region of the separator sheet, so that the second region of the separator sheet covers the first electrode, and The second electrode is folded in a seated state so that the first area of the separator sheet covers the second electrode, and an adhesive layer is formed between the electrode and the separator sheet, and the adhesive layer is used in a battery cell. It is dissolved in electrolyte solution.

The adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is located between the bottom of the electrode and the separator sheet, and the second adhesive layer may be located between the top of the electrode and the separator sheet. .

The first adhesive layer and the second adhesive layer may each be formed by applying an adhesive in the form of a plurality of dots.

A battery cell according to another embodiment of the present invention is a battery cell including the electrode assembly described above, and includes a battery case that accommodates the electrode assembly together with an electrolyte solution, and the adhesive layer is dissolved in the electrolyte solution.

According to embodiments, the present invention is an electrode assembly, an apparatus for manufacturing the same, and a method for manufacturing the same, in which an electrode and a separator sheet are stacked in a Z-folding manner, and adhesive is pre-applied on the top and bottom of the electrode, wherein the electrode is Leaving the position can be prevented.

The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by those skilled in the art from this specification and the attached drawings.

1 is a flowchart of a method for manufacturing an electrode assembly according to an embodiment of the present invention.
Figure 2 is a perspective view schematically showing a part of an electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing an adhesive being applied to a first area of a separator sheet while the table moves linearly in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing the first electrode being seated on the first region of the separator sheet in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 5 is a schematic diagram showing adhesive being applied to the top of the first electrode while the table moves linearly in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 6 is a schematic diagram showing an adhesive being applied to a second area of a separator sheet while the table moves linearly in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 7 is a schematic diagram showing the second electrode being seated on the second region of the separator sheet in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.
Figure 8 is a schematic diagram showing an adhesive being applied to a first area of a separator sheet while the first nozzle moves linearly in the electrode assembly manufacturing apparatus according to another embodiment of the present invention.
Figure 9 is a schematic diagram showing the first electrode being seated on the first region of the separator sheet in the electrode assembly manufacturing apparatus according to another embodiment of the present invention.
Figure 10 is a schematic diagram showing how adhesive is applied to the top of the first electrode while the first nozzle moves linearly in the electrode assembly manufacturing apparatus according to another embodiment of the present invention.
11 shows an electrode assembly manufacturing apparatus according to an embodiment of the present invention, where the second nozzle moves linearly, an adhesive is applied to the second area of the separator sheet, and the second electrode is seated on the second area of the separator sheet. This is a schematic diagram showing.
Figure 12 is a cross-sectional view of an electrode assembly according to an embodiment of the present invention.
Figure 13 is an exploded perspective view of a battery cell according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are given the same reference numerals throughout the specification.

In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown. In the drawing, the thickness is enlarged to clearly express various layers and regions. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

In addition, throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary.

In addition, throughout the specification, when referring to “on a plane,” this means when the target portion is viewed from above, and when referring to “in cross-section,” this means when a cross section of the target portion is cut vertically and viewed from the side.

Below, a method for manufacturing a battery cell according to an embodiment of the present invention will be described.

1 is a flowchart of a method for manufacturing an electrode assembly according to an embodiment of the present invention. Figure 2 is a perspective view schematically showing a part of an electrode assembly manufacturing apparatus according to an embodiment of the present invention. Figure 3 is a schematic diagram showing the first electrode being seated on the first region of the separator sheet in the electrode assembly manufacturing apparatus according to an embodiment of the present invention. Figure 4 is a schematic diagram showing the first electrode being seated on the first region of the separator sheet in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.

An electrode assembly manufacturing apparatus according to an embodiment of the present invention provides an electrode supply unit provided with an electrode sheet on which a plurality of electrodes are formed, and a separator sheet that folds when the electrode is seated, covers the electrode, and is stacked with the electrode. a separator supply unit, a table for seating the electrodes on a top surface to have the separator sheet folded between the electrodes to form the electrode assembly, a separator guide for guiding the folding direction of the separator sheet, and the separator sheet seated on the table. It includes a pair of nozzles for applying adhesive to at least a portion of the separator sheet and/or the electrode, and a pair of pressure rollers for pressing the separator sheet guided from the separator guide.

1 to 3, the method for manufacturing an electrode assembly according to an embodiment of the present invention includes cutting electrode sheets 1111 and 1121 to form electrodes 11 (S101); A step of seating the separator sheet 122 on the table 16 and applying adhesive to the separator sheet 122 (S102); Seating the electrode 11 on the separator sheet 122 (S103); Applying adhesive to the top of the electrode 11 and the separator sheet 122 (S104); and folding the separator sheet 122 to cover the electrode 11 (S105).

Accordingly, in the electrode assembly manufacturing method according to this embodiment, when stacking the electrode 11 and the separator sheet 122 in a Z-folding manner, an adhesive is applied to the upper and lower parts of the electrode 11, so that the electrode (11) can be prevented from leaving the correct position.

Hereinafter, each step shown in the flowchart of FIG. 1 will be described in detail with reference to FIGS. 2 to 7.

An electrode assembly manufacturing apparatus 1 according to an embodiment of the present invention includes electrode reels 111 and 112 from which electrode sheets on which a plurality of electrodes 11 are formed are unwound; A separator reel 121 that is folded when the electrode 11 is seated and the separator sheet 122 that covers the electrode 11 and is stacked with the electrode 11 is unwound; a table 16 on which the electrode 11 and the separator sheet 122 are seated; and a separator guide 125 that guides the folding direction of the separator sheet 122; A pair of nozzles 17 for applying adhesive to at least a portion of the separator sheet 122 or the electrode 11 seated on the table 16; and a pair of pressure rollers 130 that pressurize the separator sheet 122 guided from the separator guide 125. The electrode reels 111 and 112 may be an example of the electrode supply unit described above, and the separator reel 121 may be an example of the separator supply unit described above. Additionally, the pair of nozzles 17 may be an example of the applicator described above.

The electrode reels 111 and 112 include a first electrode reel 111 from which a first electrode sheet 1111 on which a plurality of first electrodes 1112 are formed is unwound; And it may include a second electrode reel 112 from which a second electrode sheet 1121 on which a plurality of second electrodes 1122 are formed is unwound.

The electrode reels 111 and 112 are reels on which the electrode sheets 1111 and 1121 are wound, and the electrode sheets 1111 and 1121 are unwound from the electrode reels 111 and 112. Then, the electrode sheets 1111 and 1121 are cut to form the electrode 11. More specifically, according to this embodiment, the first electrode reel 111 is a reel on which the first electrode sheet 1111 is wound, and the first electrode sheet 1111 is unwound from the second electrode reel 111. In addition, the second electrode reel 112 is a reel on which the second electrode sheet 1121 is wound, and the second electrode sheet 1121 is unwound from the second electrode reel 112.

Here, the electrode sheets 1111 and 1121 may be manufactured by applying a slurry of an electrode active material, a conductive material, and a binder onto an electrode current collector, then drying and pressing the slurry. However, the method for manufacturing the electrode sheets 1111 and 1121 is not limited to this, and any method for manufacturing the electrode sheets 1111 and 1121 generally used in the relevant technical field may be included in the present embodiment.

More specifically, the first electrode sheet 1111 and the second electrode sheet 1121 may include electrode active materials having different polarities. That is, the first electrode 1112 and the second electrode 1122 may be electrodes 11 having different polarities. For example, if the first electrode 1112 is an anode, the second electrode 1122 may be a cathode. As another example, if the first electrode 1112 is a cathode, the second electrode 1122 may be an anode.

The separator reel 121 is a reel on which the separator sheet 122 is wound, and the separator sheet 122 is unwound from the separator reel 121. Thereafter, the separator sheet 122 is stacked with the electrode 11 formed by cutting the electrode sheets 1111 and 1121. Here, the electrode 11 and the separator sheet 122 are stacked in a Z-folding manner. More specifically, in this embodiment, when the first electrode 1112 is seated on the separator sheet 122, one side is folded to cover the first electrode 1112, and when the second electrode 1122 is seated, the other side is folded. and covers the second electrode 1122. The separator sheet 122 may have a zigzag shape.

The table 16 may be stacked with the electrode 11 and the separator sheet 122 seated on the top surface. More preferably, the upper surface of the table 16 is formed to be substantially flat, so that the electrodes 11 and the separator sheet 122 can be stably stacked.

The table 16 may be disposed between the first electrode reel 111 and the second electrode reel 112. More specifically, the table 16 can move between the first electrode reel 111 and the second electrode reel 112. For example, in FIG. 3, it can move forward and backward along the horizontal direction, and can make a linear reciprocating movement toward the first electrode reel 111 and the second electrode reel 112.

Accordingly, the table 16 makes a linear reciprocating motion between the first electrode reel 111 and the second electrode reel 112, allowing the electrodes 11 to be stacked more quickly on the table 16 and the separator. Since the guide 125 can assist in folding the separator sheet 122, process speed and efficiency can be further improved.

The electrode assembly manufacturing apparatus 1 according to this embodiment includes a first transfer device 141 that transfers the first electrode 1112 toward the table 16; And it may further include a second transfer device 142 that transfers the second electrode 1122 toward the table 16. Here, the first transfer device 141 may transfer the first electrode 1112 formed by cutting the first electrode sheet 1111 unrolled from the first electrode reel 111 toward the table 16. Additionally, the second transfer device 142 may transfer the second electrode 1122 formed by cutting the second electrode sheet 1121 unrolled from the second electrode reel 112 toward the table 16.

Accordingly, in this embodiment, the first electrode 1112 and the second electrode 1122 can be transferred to both sides of the table 16 through the first transfer device 141 and the second transfer device 142, respectively. It may be easy to alternately stack the first electrode 1112 and the second electrode 1122 on the separator sheet 122.

Referring to FIGS. 2 to 4 , the electrode assembly manufacturing apparatus 1 according to this embodiment may include headers 151 and 152 that adsorb the electrode 11 and seat it on the separator sheet 122. More specifically, the headers 151 and 152 adsorb the first electrode 1112 and seat it on the separator sheet 122. The first header 151 and the second electrode 1122 adsorb and seat the first electrode 1112 on the separator sheet 122. It may further include a second header 152 for seating. Here, the first header 151 and the second header 152 may each move toward the table 16. For example, in FIG. 3, it is possible to move forward and backward along the horizontal direction and to move back and forth in a straight line.

More specifically, the first header 151 may adsorb the first electrode 1112 transferred from the first transfer device 141 toward the table 16, and the second header 152 may adsorb the first electrode 1112 transferred from the first transfer device 141 toward the table 16. The second electrode 1122 transferred from 142 toward the table 16 can be adsorbed. Additionally, the first header 151 and the second header 152 can move straight toward the table 16.

Accordingly, in this embodiment, the first header 151 and the second header 152 can move the electrode 11 above the table 16 and stably attach the electrode 11 to the separator sheet 122. It can be settled with .

In addition, the headers 151 and 152 measure whether the first electrode 1112 or the second electrode 1122 is distorted for each first electrode 1112 or the second electrode 1122 and then correct the position as necessary. , it can be accurately seated in a desired position on the separator sheet 122 located on the table 16. Accordingly, in this embodiment, the degree of alignment between the electrodes 11 and the separator sheet 122 stacked and aligned on the table 16 can be further improved.

Referring to FIG. 3, a pair of nozzles 17 applies adhesive to at least a portion of the surface corresponding to the top of the electrode 11 and/or the top of the separator sheet 122. More specifically, the pair of nozzles 17 apply adhesive to at least a portion of the upper portion of the first electrode 1112 and the first nozzle 171 applies adhesive to at least a portion of the upper portion of the second electrode 1122. It includes a second nozzle 172.

Here, the first nozzle 171 can form the first adhesive layer 1710 by applying adhesive to the first area 1221 of the separator sheet 122 seated on the table 16, as shown in FIG. 3. More specifically, as the table 16 moves straight toward the first transfer device 141 as shown in FIG. 3, the adhesive applied from the first nozzle 171 moves to the first area 1221 of the separator sheet 122. The first adhesive layer 1710 can be formed. Thereafter, the first electrode 1112 may be seated on the first area 1221 of the separator sheet 122 on which the first adhesive layer 1710 is formed.

Here, the first area 1221 of the separator sheet 122 refers to an area of the separator sheet 122 to which the first electrode 1112 is attached. In some cases, the first area 1221 refers to an area in the separator sheet 122 to which the first electrode 1112 is attached while covering the second electrode 1122. And, the second area 1222 refers to an area of the separator sheet 122 that covers the first electrode 1112 and is attached to the second electrode 1122. In other words, the first electrode 1112 is seated on the first area 1221 of the separator sheet 122, and the second electrode 1122 is seated on the second area 1222 of the separator sheet 122. You can.

Here, it may be desirable for the adhesive to be uniformly applied to the first area 1221 of the separator sheet 122. However, if the adhesive is applied to the entire first area 1221 of the separator sheet 122, the amount of adhesive applied may be excessively large. In this case, the adhesive may flow to the outside of the separator sheet 122 and contaminate other parts, and the function of generating power when the secondary battery is manufactured may not function smoothly.

Accordingly, in this embodiment, it may be desirable to apply the adhesive to the first region 1221 of the separator sheet 122 using a spot application method in which the adhesive is applied in the form of a dot or a line application method in which the adhesive is applied in the form of a line. That is, it may be desirable for the first adhesive layer 1710 to be formed in a spot pattern or a line pattern.

On the other hand, if the amount of adhesive applied is excessively small, the electrode 11 is still not fixed to the separator sheet 122 and may deviate from its original position while the cell moves. Therefore, it may be desirable that the spacing between the areas where the adhesive is applied is not excessively wide.

Meanwhile, the adhesive included in the adhesive layer 1710 located between the first region 1221 of the separator sheet 122 and the first electrode 1112 may be dissolved in the electrolyte solution. More specifically, when the first adhesive layer 1710 is impregnated with an electrolyte solution, the adhesive included in the first adhesive layer 1710 may be dissolved in the electrolyte solution. Here, dissolving the adhesive may mean that the adhesive melts into the electrolyte solution. That is, this means that the area of the first adhesive layer 1710 is reduced or the first adhesive layer 1710 disappears altogether, so that no first adhesive layer 1710 remains in the first area 1221 of the separator sheet 122. can do.

As an example, the adhesive may be an acrylate-based adhesive. That is, in this embodiment, as the acrylate-based adhesive is applied to the first area 1221 of the separator sheet 122, the adhesive can be dissolved in the electrolyte solution contained in the final battery cell.

Accordingly, in this embodiment, the first adhesive layer 1710 fixes the first electrode 1112 to the first region 1221 of the separator sheet 122 during the manufacturing process to prevent it from being moved from its original position. . In addition, the first adhesive layer 1710 is dissolved in the electrolyte solution contained in the final battery cell, so it may not interfere with the movement of lithium ions between the electrode and the separator, and battery cell performance may also be improved.

3 and 4, the electrode assembly manufacturing apparatus 1 according to this embodiment may include a pair of pressure rollers 130 that press the separator sheet 122 guided from the separator guide 125. You can. A pair of pressure rollers 130 may be designed to bias the separator sheet 122 between the separator guide 125 and the table 16. More specifically, a pair of pressure rollers 130 may be located between the table 16 and the separator guide 125. Here, the pair of pressure rollers 130 may be fixed. In one example, the pressure roller 130 may not move.

As an example, the pair of pressure rollers 130 may have a pair of rolls arranged horizontally. For example, as shown in FIG. 3, each pressure roller 130 may be arranged to be spaced apart from each other along the horizontal direction. The pressure roller 130 may pressurize one surface of the separator sheet 122. However, the shape of the pressure roller 130 is not limited to this, and any shape capable of pressing one surface of the separator sheet 122 may be included in the present embodiment.

Accordingly, at least one of the pair of pressure rollers 130 presses one side of the separator sheet 122, as shown in FIGS. 3 and 4, to keep the tension, direction and/or position of the separator sheet 122 constant. You can control it. Therefore, as shown in FIGS. 3 and 4, while the table 16 moves with respect to the separator guide 125, the pair of pressure rollers 130 maintain the direction of the separator sheet 122 with respect to the nozzles 171 and 172. and/or ensure that distance is maintained.

In particular, a pair of pressure rollers 130 may be located between the first nozzle 171 and the second nozzle 172. More specifically, the pair of pressure rollers 130 may include a first pressure roller 1301 and a second pressure roller 1302. Here, the first pressure roller 1301 is located between the first nozzle 171 and the separator guide 125, and the second pressure roller 1302 is located between the second nozzle 172 and the separator guide 125. You can. That is, the first nozzle 171 and the second nozzle 172 can apply adhesive on the separator sheet 122 pressed by at least one of the pair of pressure rollers 130.

As an example, as shown in FIG. 3, the first pressure roller 1301 presses one surface of the separator sheet 122 in the process of applying adhesive from the first nozzle 171 to the first area 1221 of the separator sheet 122. can be pressurized. Accordingly, the first pressure roller 1301 can maintain a constant height difference between the first area 1221 of the separator sheet 122 and the first nozzle 171 and apply the first adhesive layer 1710. The amount or application thickness can be relatively uniform. This can be similarly explained in the case of the second pressure roller 1302.

In addition, in a state where the separator sheet 122 is pressed by the first pressure roller 1301, the first nozzle 171 is between the first area 1221 of the separator sheet 122 and the first nozzle 171. Height or angle can be adjusted. For example, based on the first area 1221 of the separator sheet 122, the first nozzle 171 has a constant height difference between the first area 1221 of the separator sheet 122 and the first nozzle 171. It may be moved so that the angle between the first area 1221 of the separator sheet 122 and the first nozzle 171 is constant.

Accordingly, in a state in which the separator sheet 122 is pressed by the first pressure roller 1301, the height difference or angle between the first nozzle 171 and the first area 1221 of the separator sheet 122 is the same. Therefore, the application reliability of the adhesive applied from the first nozzle 171 to the first area 1221 of the separator sheet 122 can be further improved. This means that, as shown in FIGS. 6 and 7, in a state in which the separator sheet 122 is pressed by the second pressure roller 1302, the second nozzle 172 is applied to the second area 1222 of the separator sheet 122. The case of applying adhesive can also be explained in the same way.

Figure 5 is a schematic diagram showing adhesive being applied to the top of the first electrode while the table moves linearly in the electrode assembly manufacturing apparatus according to an embodiment of the present invention. Figure 6 is a schematic diagram showing an adhesive being applied to a second area of a separator sheet while the table moves linearly in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 3 to 6 , the first nozzle 171 and the second nozzle 172 may be disposed on both sides with the separator sheet 122 in between.

That is, the first nozzle 171 covers at least the upper part of the first electrode 1112 before the second region 1222 of the separator sheet 122 covers the upper part of the first electrode 1112 as shown in FIG. 5. The second adhesive layer 1750 can be formed by applying adhesive to a portion. In addition, as shown in FIG. 6, after the second area 1222 of the separator sheet 122 covers the upper part of the first electrode 1112, the second nozzle 172 is configured to cover the second area 1222 of the separator sheet 122 ( The first adhesive layer 1710 may be formed by applying adhesive to at least a portion of 1222).

In the opposite case as well, the second nozzle 172 covers the upper part of the second electrode 1122 before the first area 1221 of the separator sheet 122 covers the upper part of the second electrode 1122. The second adhesive layer 1750 may be formed by applying an adhesive to at least a portion of the . In addition, the first nozzle 171 is configured to cover at least the first area 1221 of the separator sheet 122 after the top of the second electrode 1122 is covered by the first area 1221 of the separator sheet 122. The first adhesive layer 1710 can be formed by applying adhesive to a portion.

Here, the table 16 can linearly reciprocate left and right based on the pair of nozzles 17. That is, the table 16 moves linearly in the direction toward the first transfer device 141 or the second transfer device 142 with respect to the pair of nozzles 17, while providing the electrode 11 or the separator sheet 122. Adhesive may be applied to at least a portion of the upper part of the.

Additionally, the description of the adhesive and the second adhesive layer 1750 applied from the pair of nozzles 17 may be the same as the first adhesive layer 1710 described above. Here, the first adhesive layer 1710 is formed by applying an adhesive between the lower part of the electrode 11 and the separator sheet 122, and the second adhesive layer 1750 is formed by applying an adhesive between the upper part of the electrode 11 and the separator sheet 122. It can be classified as being formed by applying.

In addition, as shown in FIGS. 5 and 6, before the second area 1222 of the separator sheet 122 covers the upper part of the first electrode 1112, the first nozzle 171 is connected to the first electrode 1112. At the same time, the second adhesive layer 1750 is formed by applying adhesive to at least a portion of the upper portion, and the second nozzle 172 applies adhesive to at least a portion of the second region 1222 of the separator sheet 122 to form the first adhesive layer 1750. An adhesive layer 1710 can be formed. This is the opposite case, and before the first area 1221 of the separator sheet 122 covers the upper part of the second electrode 1122, the second nozzle 172 covers at least a portion of the upper part of the second electrode 1122. At the same time, the adhesive is applied to form the second adhesive layer 1750, and the first nozzle 171 applies the adhesive to at least a portion of the first area 1221 of the separator sheet 122 to form the first adhesive layer 1710. can be formed.

Accordingly, in this embodiment, the pair of nozzles 17 can simultaneously apply adhesive to the upper part of the separator sheet 122 or the electrode 11, respectively, reducing the process time of the adhesive application process and increasing process efficiency. It can be improved more than this.

Additionally, as shown in FIG. 5 , the pair of pressure rollers 130 may have a second adhesive layer 1750 formed on the first electrode 1112 spaced apart from each other. Accordingly, when the table 16 moves in a straight line, the adhesive applied to the second adhesive layer 1750 formed on the first electrode 1112 can be prevented from directly contacting the pair of pressure rollers 130.

In addition, as shown in FIG. 6, the second pressure roller 1302 presses one surface of the separator sheet 122 and moves the second region 1222 of the separator sheet 122 in a direction opposite to the moving direction of the table 16. The first adhesive layer 1710 and/or the second adhesive layer 1750 between the first electrode 1112 and the first electrode 1112 may be pressed. Accordingly, the first adhesive layer 1710 and/or the second adhesive layer 1750 formed between the first electrode 1112 and the second region 1222 of the separator sheet 122 can be applied more uniformly. This can be similarly explained when the first pressure roller 1301 presses the first region 1221 of the separator sheet 122 covering the second electrode 1122 on which the first adhesive layer 1710 is formed. .

Figure 7 is a schematic diagram showing the separator guide moving linearly and the second electrode being seated on the second area of the separator sheet in the electrode assembly manufacturing apparatus according to an embodiment of the present invention.

Referring to FIGS. 6 and 7 , in this embodiment, the folding direction of the separator sheet 122 may be guided by the separator guide 125. Here, the pair of pressure rollers 130 may assist in guiding the folding direction of the separator sheet 122 by the separator guide 125.

As an example, the separator guide 125 may have a form in which a pair of rolls are arranged horizontally, and with the separator sheet 122 inserted between the pair of pressure rollers 130, the second pressure roller 1302 may pressurize the separator sheet 122. However, the form of the separator guide 125 is not limited to this, and any form that can control the folding direction of the separator sheet 122 can be included in the present embodiment.

Additionally, the separator guide 125 may be positioned above and below the pair of nozzles 17, respectively. However, the position and number of separator guides 125 are not limited to this, and any position and number that can control the folding direction of the separator sheet 122 can be included in the present embodiment.

Additionally, the separator guide 125 may be fixed together with a pair of nozzles 17 and a pair of pressure rollers 130. Here, the table 16 linearly reciprocates toward the first transfer device 141 and the second transfer device 142 based on the separator guide 125, and the separator sheet 122 guided by the separator guide 125 ) is folded along the moving direction of the separator guide 125, so that the separator sheet 122 can cover the electrode 11.

For example, referring to FIGS. 6 and 7 , in a state where the first electrode 1112 is seated on the first area 1221 of the separator sheet 122, the table 16 is connected to the second transfer device 142. By moving in a straight line toward , the second area 1222 of the separator sheet 122 may cover the top of the first electrode 1112.

Accordingly, as the table 16 reciprocates in a straight line, the adhesive application process of the pair of nozzles 17 and the folding process of the separator sheet 122 by the separator guide 125 can be performed simultaneously, thereby Time can be reduced and process efficiency can be further improved.

Using this electrode assembly manufacturing apparatus 1, the electrode assembly manufacturing method according to an embodiment of the present invention can be performed as follows.

First, referring to FIGS. 1 and 3, when the first electrode sheet 1111 is unwound from the first electrode reel 111, the first cutter 131 cuts the first electrode sheet 1111 and forms a plurality of The first electrode 1112 is formed (S101).

Meanwhile, when the separator sheet 122 is unwound from the separator reel 121, the separator sheet 122 is seated on the upper surface of the table 16 while being pressed by the first pressure roller 1301, and the first nozzle ( 171) applies adhesive to the separator sheet 122 (S102). At this time, the table 16 moves straight toward the first transfer device 141, and along with the movement of the table 16, the first nozzle 171 moves on the first area 1221 of the separator sheet 122. A first adhesive layer 1710 is formed.

Additionally, referring to FIGS. 1 and 4 , the first header 151 can move straight on the table 16 while adsorbing the first electrode 1112. And, when the first header 151 is located above the table 16, as shown in FIG. 3, the first header 151 is attached to the separator sheet 122 on which the first adhesive layer 1710 is formed. The first electrode 1112 is seated in the first area 1221 (S103).

In addition, referring to FIGS. 1, 5, and 6, after the first electrode 1112 is seated in the first area 1221 of the separator sheet 122, the table 16 is connected to the second transfer device 142. As it moves toward, the first nozzle 171 applies adhesive to the top of the first electrode 1112 to form a second adhesive layer 1750. In addition, with one side of the separator sheet 122 pressed by the second pressure roller 1302, as the table 16 moves toward the second transfer device 142, the second nozzle 172 also moves toward the separator. An adhesive is applied to the second area 1222 of the sheet 122 to form a first adhesive layer 1710 (S104).

Additionally, referring to FIGS. 1, 6, and 7, as the table 16 moves toward the second transfer device 142 based on the separator guide 125, one side of the separator sheet 122 is folded. , the second area 1222 of the separator sheet 122 covers the first electrode 1112 on which the second adhesive layer 1750 is formed (S105).

Meanwhile, as shown in FIG. 3, when the second electrode sheet 1121 is unwound from the second electrode reel 112, the second cutter 132 cuts the second electrode sheet 1121. Then, a plurality of second electrodes 1122 are formed. Thereafter, as shown in FIG. 7 , when the second transfer device 142 transfers the second electrode 1122, the second header 152 adsorbs the second electrode 1122. And, if the second area 1222 of the separator sheet 122 covers the first electrode 1112, the second header 152 adsorbing the second electrode 1122 covers the second area 1222. Moving upward, the second electrode 1122 is seated on the second area 1222 where the first adhesive layer 1710 is formed.

And, like the first nozzle 171 in FIG. 5, the second nozzle 172 applies adhesive to the top of the second electrode 1122. Here, as the table 16 moves toward the first transfer device 141, the second nozzle 172 may form a second adhesive layer 1750 on the second electrode 1122.

Thereafter, as the table 16 moves toward the first transfer device 141 based on the separator guide 125, the other side of the separator sheet 122 is folded, and the first area 1221 of the separator sheet 122 is folded. ) covers the second electrode 1122 on which the second adhesive layer 1750 is formed.

That is, by repeating the above processes, the electrode assembly manufacturing method according to an embodiment of the present invention can be performed.

When performing the electrode assembly manufacturing method according to the embodiments of the present invention, when stacking the electrode 11 and the separator sheet 122 in a Z-folding manner, adhesive is applied to the upper and lower parts of the electrode 11, respectively. This prevents the electrode 11 from leaving its original position.

Hereinafter, the electrode assembly manufacturing apparatus 2 according to another embodiment of the present invention will be described. The electrode assembly manufacturing apparatus 2 of this embodiment can be described in most parts the same as the electrode assembly manufacturing apparatus 1 described above in FIGS. 2 to 7, and hereinafter, only the parts that are different from the electrode assembly manufacturing apparatus 1 will be described. I want to.

Figure 8 is a schematic diagram showing an adhesive being applied to a first area of a separator sheet while the first nozzle moves linearly in the electrode assembly manufacturing apparatus according to another embodiment of the present invention.

Referring to FIG. 8, in the electrode assembly manufacturing apparatus 2 of this embodiment, the table 16a may be fixed. Accordingly, the electrode 11 and the separator sheet 122 can be stacked on the table 16 while the table 16a is fixed, and the alignment of the electrode 11 and the separator sheet 122 is further improved. It can be.

In addition, the separator guide 125, the first nozzle 171a, and the second nozzle 172a can move forward and backward along the horizontal direction of FIG. 7 between the first and second electrode reels 111 and 112. . For example, the separator guide 125, the first nozzle 171a, and the second nozzle 171b may linearly reciprocate left and right with respect to the table 16a. For example, as shown in FIG. 8, as the first nozzle 171a moves linearly toward the second transfer device 142 based on the table 16a, adhesive is applied to the first area 1221 of the separator sheet 122. The first adhesive layer 1710 can be formed by applying.

Additionally, the pair of pressure rollers 130 may move together with the separator guide 125, the first nozzle 171a, and the second nozzle 172a while pressing one surface of the separator sheet 122. As an example, the first pressure roller 1301 may move together with the second pressure roller 1302, the first nozzle 171a, and the second nozzle 172a while pressing one surface of the separator sheet 122. . Accordingly, the pair of pressure rollers 130 can maintain the tension of the separator sheet 122. In addition, the height difference between the first nozzle 171a and the second nozzle 172a and the separator sheet 122 can be maintained.

As an example, the electrode assembly manufacturing apparatus 2 of this embodiment may further include a moving box 18 accommodating the separator guide 125, the first nozzle 171a, and the second nozzle 172a. That is, in the electrode assembly manufacturing apparatus 2 of this embodiment, as the moving box 18 moves, the separator guide 125, the first nozzle 171a, and the second nozzle 172a can move simultaneously.

Accordingly, the gap between the first nozzle 171a and the separator guide 125 and the gap between the second nozzle 172a and the separator guide 125 can be maintained constant, and the first nozzle 171a and the separator guide 125 can be kept constant. 2 The application reliability of the adhesive applied from the nozzle 172a can be improved.

In addition, the angle of the first nozzle 171a and/or the second nozzle 172a is rotated within the moving box 18, or the first nozzle 171a and the second nozzle 172a are moved, causing the first nozzle ( 171a) and/or the height difference or angle between the second nozzle 172a and the separator 122 can be adjusted. Even in this case, the distance between the first nozzle 171a and the separator guide 125 and the distance between the second nozzle 172a and the separator guide 125 within the moving box 18 can be maintained the same, The application reliability of the adhesive applied from the first nozzle 171a and the second nozzle 172a can be further improved.

Using this electrode assembly manufacturing apparatus 1a, the electrode assembly manufacturing method according to another embodiment of the present invention is performed as follows.

First, referring to FIGS. 1 and 8, when the first electrode sheet 1111 is unwound from the first electrode reel 111, the first cutter 131 cuts the first electrode sheet 1111 and forms a plurality of The first electrode 1112 is formed (S101).

Meanwhile, when the separator sheet 122 is unwound from the separator reel 121, the separator sheet 122 is seated on the upper surface of the table 16a while being pressed by the first pressure roller 1301, and the first nozzle ( 171a) applies adhesive to the separator sheet 122 (S102). At this time, the first nozzle 171a moves straight toward the second transfer device 142 and forms a first adhesive layer 1710 on the first area 1221 of the separator sheet 122.

Figure 9 is a schematic diagram showing the first electrode being seated on the first region of the separator sheet in the electrode assembly manufacturing apparatus according to another embodiment of the present invention.

Additionally, referring to FIGS. 1 and 9 , the first header 151 can move straight on the table 16 while adsorbing the first electrode 1112. And, when the first header 151 is located above the table 16a, as shown in FIG. 9, the first header 151 is attached to the separator sheet 122 on which the first adhesive layer 1710 is formed. The first electrode 1112 is seated in the first area 1221 (S103).

Figure 10 is a schematic diagram showing how adhesive is applied to the top of the first electrode while the first nozzle moves linearly in the electrode assembly manufacturing apparatus according to another embodiment of the present invention. 11 shows an electrode assembly manufacturing apparatus according to an embodiment of the present invention, where the second nozzle moves linearly, an adhesive is applied to the second area of the separator sheet, and the second electrode is seated on the second area of the separator sheet. This is a schematic diagram showing.

In addition, referring to FIGS. 1, 10, and 11, after the first electrode 1112 is seated in the first area 1221 of the separator sheet 122, the first nozzle 171a is connected to the first transfer device ( As it moves toward 141, the first nozzle 171a applies adhesive to the top of the first electrode 1112 to form a second adhesive layer 1750. In addition, while one side of the separator sheet 122 is pressed by the second pressure roller 1302, the second nozzle 172a also moves toward the first transfer device 141, so that the separator sheet 122 An adhesive is applied to the second area 1222 to form a first adhesive layer 1710 (S104).

In addition, referring to FIGS. 1, 10, and 11, as the separator guide 125 and the pair of pressure rollers 130 move toward the first transfer device 141 based on the table 16a, the separator One side of the sheet 122 is folded, so that the second area 1222 of the separator sheet 122 covers the first electrode 1112 on which the second adhesive layer 1750 is formed (S105).

Meanwhile, as shown in FIG. 8, when the second electrode sheet 1121 is unwound from the second electrode reel 112, the second cutter 132 cuts the second electrode sheet 1121. Then, a plurality of second electrodes 1122 are formed. Thereafter, as shown in FIG. 11 , when the second transfer device 142 transfers the second electrode 1122, the second header 152 adsorbs the second electrode 1122. And, if the second area 1222 of the separator sheet 122 covers the first electrode 1112, the second header 152 adsorbing the second electrode 1122 covers the second area 1222. Moving upward, the second electrode 1122 is seated on the second area 1222 where the first adhesive layer 1710 is formed.

And, as shown in FIG. 10, the second nozzle 172 applies adhesive to the top of the second electrode 1122. Here, as the second nozzle 172a moves toward the second transfer device 142, the second nozzle 172a may form a second adhesive layer 1750 on the second electrode 1122.

Thereafter, as the separator guide 125 and the pair of pressure rollers 130 move toward the second transfer device 142 based on the table 16a, the other side of the separator sheet 122 is folded, and the separator sheet 122 is folded. The first area 1221 of 122 covers the second electrode 1122 on which the second adhesive layer 1750 is formed.

That is, by repeating the above processes, the electrode assembly manufacturing method according to an embodiment of the present invention can be performed.

When performing the electrode assembly manufacturing method according to the embodiments of the present invention, when stacking the electrode 11 and the separator sheet 122 in a Z-folding manner, adhesive is applied to the upper and lower parts of the electrode 11, respectively. This prevents the electrode 11 from leaving its original position.

Figure 12 is a cross-sectional view of an electrode assembly according to an embodiment of the present invention.

Referring to FIGS. 7, 11, and 12, in the electrode assembly 10 in which electrodes and separator sheets are alternately stacked according to another embodiment of the present invention, the electrode 11 includes the first electrode 1112 and It includes a second electrode 1122, and the separator sheet 122 has a zigzag shape formed by being folded at least twice.

Here, the separator sheet 122 is folded with the first electrode 1112 seated on the first region 1221 of the separator sheet 122, so that the second region 1222 of the separator 122 is the first region 1222 of the separator sheet 122. It covers the electrode 11. In addition, the second electrode 1122 is seated on the second area 1222 of the separator sheet 122 and is folded so that the first area 1221 of the separator sheet 122 covers the second electrode 1122. I'm doing it.

In particular, in the electrode assembly 10 according to this embodiment, the electrodes 11 may be stacked one by one on the first area 1221 or the second area 1222 of the separator sheet 122. At this time, after measuring whether the electrode 11 is distorted, the electrode 11 can be stacked at an exact position on the separator sheet 122 with the position corrected as necessary. Accordingly, the electrode assembly 10 according to this embodiment may have improved alignment between the electrode 11 and the separator sheet 122.

Here, an adhesive layer 1700 is formed between the electrode 11 and the separator sheet 122. More specifically, the adhesive layer 1700 includes a first adhesive layer 1710 and a second adhesive layer 1750. The first adhesive layer 1710 may be located between the bottom of the electrode 11 and the separator sheet 122, and the second adhesive layer 1750 may be located between the top of the electrode 11 and the separator sheet 122.

For example, the first adhesive layer 1710 and the second adhesive layer 1750 may each be formed by applying adhesive in the form of a plurality of dots. However, as previously described in the battery cell manufacturing apparatus 1, the shapes of the first adhesive layer 1710 and the second adhesive layer 1750 are not limited thereto, and may be formed in various shapes.

Accordingly, the electrode assembly 10 according to this embodiment has an adhesive layer 1700 formed between the electrode 11 and the separator sheet 122, so that even in the case of a low-cost separator with excessively low adhesive force, the electrode 11 and the separator sheet 122 are formed. Since the separators can be stably fixed to each other, the electrode 11 can be prevented from being moved from its proper position. In addition, the electrode assembly 10 of this embodiment covers the upper and lower parts of the electrode 11 in a folded form with one separator sheet 122, thereby further improving the alignment of the electrode 11 and the efficiency of the process. It can be.

In addition, since there is no need to perform a laminating process as in the past, the defect rate in the process caused by high heat and pressure can be reduced. And, since the laminator can be removed, the volume of the manufacturing device can be reduced and the manufacturing process can be simplified.

The separator according to the embodiment described in this specification may be a ceramic coated separator (CCS). Generally, a separator includes a fabric film and a coating layer formed on at least one side of the fabric film, and the coating layer may include alumina powder and a binder that binds them together. Safety Reinforced Separator (SRS) has a large amount of binder coated on the surface of the coating layer, but CCS may not have a binder coated on the surface of the coating layer, or the binder content distributed on the surface may be very low compared to SRS. For example, in the case of the CCS separator according to this embodiment, the binder content coated on the surface of the coating layer of the separator may be approximately 3 wt% or less. For example, the binder content coated on the surface of the coating layer of the separator may be approximately 2 wt% or less or approximately 1 wt% or less.

When the separator is CCS, the internal electrode included in the electrode assembly is transported in an unfixed state, so there is a possibility that alignment may be disturbed during transport. Of course, if the separator is CCS, it can be fixed with heat and pressure, but the alignment of the internal electrodes may be disturbed even in the process of forming a laminate of electrodes and a separator and then transferring it to a heat and pressure fixing device. In addition, there is a disadvantage of having to use an expensive separator with a high binder content in order to attach the electrode and separator using heat and pressure. On the other hand, according to this embodiment, the fixation force can be increased while preventing the alignment of the internal electrodes from being disturbed during transport.

Figure 13 is an exploded perspective view of a battery cell according to an embodiment of the present invention.

Referring to FIGS. 7, 11, 12, and 13, a battery cell according to another embodiment of the present invention is a battery cell including the electrode assembly 10 described above, and the electrode assembly 10 together with an electrolyte solution. It includes a battery case 50 that accommodates, and the adhesive layer 1700 is dissolved in the electrolyte solution.

Here, a fixing member such as a fixing tape 30 may be attached to the outside of the electrode assembly 10. Accordingly, the stacked alignment state of the electrode 11 and the separator sheet 122 can be maintained. The electrode assembly 10 to which the fixing tape 30 is attached may be referred to as the final electrode assembly 20.

The battery case 50 includes an accommodating portion 60 on which the electrode assembly 10 or the final electrode assembly 20 is mounted, and a sealing portion 70 that seals the outer periphery of the accommodating portion 60. As an example, the battery case 50 may be a laminate sheet including a resin layer and a metal layer. More specifically, the battery case 50 is made of a laminated sheet and may be composed of an outer resin layer forming the outermost layer, a barrier metal layer to prevent penetration of substances, and an inner resin layer for sealing.

Additionally, the receiving portion 60 of the battery case 50 may contain an electrolyte solution together with the electrode assembly 10. Here, the adhesive layer 1700 included in the electrode assembly 10 may be dissolved into the electrolyte solution. In particular, in the battery cell according to this embodiment, the adhesive layer 1700 included in the electrode assembly 10 may be dissolved into the electrolyte solution under high temperature and/or pressurized conditions during an activation process such as a formation process.

More specifically, in the battery cell according to this embodiment, when the adhesive layer 1700 formed between the electrode 11 of the electrode assembly 10 and the separator sheet 122 is dissolved into the electrolyte solution, the surface of the electrode 11 There may be very little adhesive 14 remaining, or it may be completely gone.

In contrast, since the separator sheet 122 is generally a porous sheet, some of the adhesive 14 may have penetrated into the separator sheet 122. However, even in the case of the adhesive layer 1700 that has penetrated the separator sheet 122, most or all of the adhesive layer may be dissolved in the electrolyte solution, and traces of application of the adhesive layer 1700 may remain on the separator sheet 122 during this process. there is.

Here, traces of application of the adhesive layer 1700 may mean that although no adhesive component included in the adhesive layer 1700 remains, a portion of the outer surface of the separator sheet 122 has been deformed by the adhesive layer 1700. However, it is not limited to this, and the application traces of the adhesive layer 1700 may refer to traces that can confirm whether or not the adhesive has been applied in various ways, such as traces that can confirm whether or not the adhesive has been applied with the naked eye. Accordingly, traces of application of the adhesive layer 1700 formed on the separator sheet 122 may be formed at the same location where the adhesive is applied.

Accordingly, in the battery cell according to this embodiment, the adhesive layer 1700 is completely dissolved on the surface of the electrode 11 or the separator 122, and unreacted areas due to the adhesive layer 1700 disappear, preventing performance degradation and providing excellent battery performance. This can be implemented.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims can also be made. It falls within the scope of invention rights.

1, 1a: Cell manufacturing device
11: electrode
16, 16a: table
17: nozzle
111: first electrode reel
112: second electrode reel
121: Separator reel
122: Separator sheet
125: Separator guide
131: first cutter
132: second cutter
141: first transport device
142: second transfer device
151: first header
152: second header
171, 171a: first nozzle
172, 172a: second nozzle
1111: first electrode sheet
1112: first electrode
1121: second electrode sheet
1122: second electrode
1221: First area
1222: Second area
1301: first pressure roller
1302: Second pressure roller
1710: first adhesive layer 1750: second adhesive layer

Claims (20)

An electrode supply unit provided with an electrode sheet on which a plurality of electrodes are formed;
A separator supply unit that folds when the electrode is seated and is provided with a separator sheet that covers the electrode and is stacked with the electrode;
a table seating the electrodes on a top surface with the separator sheet folded between the electrodes to form an electrode assembly;
A separator guide that guides the folding direction of the separator sheet;
a pair of applicators for applying adhesive to at least a portion of the separator sheet and/or the electrode seated on the table; and
An electrode assembly manufacturing apparatus comprising a pair of pressure rollers that press the separator sheet guided from the separator guide. In paragraph 1:
The pair of pressure rollers is an electrode assembly manufacturing device positioned between the table and the separator guide. In paragraph 2,
The electrode supply unit,
a first electrode supply unit supplying a first electrode sheet on which a plurality of first electrodes are formed; and
An electrode assembly manufacturing apparatus comprising a second electrode supply unit from which a second electrode sheet on which a plurality of second electrodes are formed is supplied. In paragraph 3,
a first transfer device that transfers the first electrode toward the table; and
An electrode assembly manufacturing apparatus further comprising a second transfer device that transfers the second electrode toward the table. In paragraph 3,
The pair of applicators includes a first nozzle and a second nozzle,
An electrode assembly manufacturing device in which the pair of applicators respectively apply adhesive to the separator sheet or the electrode located on the table. In paragraph 5,
The first nozzle and the second nozzle are disposed on both sides with the separator guide between them. In paragraph 6:
The pair of pressure rollers includes a first pressure roller and a second pressure roller,
The first pressure roller is located between the first nozzle and the separator guide, and the second pressure roller is located between the second nozzle and the separator guide. In paragraph 4,
The first electrode is seated on the first area of the separator sheet,
The second electrode is an electrode assembly manufacturing device wherein the second electrode is seated on the second area of the separator sheet. In paragraph 8:
a first header that adsorbs the first electrode and seats it in the first area; and
An electrode assembly manufacturing apparatus further comprising a second header that adsorbs the second electrode and seats it in the second area. In paragraph 8:
The separator guide, the pair of applicators, and the pair of pressure rollers are fixed,
An electrode assembly manufacturing apparatus in which the table linearly reciprocates toward the first transfer device and the second transfer device. In paragraph 8:
The table is fixed,
The electrode assembly manufacturing apparatus wherein the separator guide, the pair of applicators, and the pair of pressure rollers linearly reciprocate toward the first transfer device and the second transfer device. In paragraph 10:
An electrode assembly manufacturing apparatus further comprising a moving box accommodating the separator guide and the pair of applicators therein. forming a plurality of first electrodes by cutting the first electrode sheet provided from the first electrode supply unit;
A separator sheet provided from a separator supply unit is guided along a separator guide, the separator sheet is seated on a table with a first pressure roller pressing the separator sheet guided from the separator guide, and a first area of the separator sheet Applying adhesive by a first nozzle to;
Seating the first electrode on the adhesive applied to the first area of the separator sheet;
Applying adhesive by a first nozzle to the top of the first electrode; and
A method of manufacturing an electrode assembly comprising folding the separator sheet in a folding direction guided by the separator guide, so that the second area of the separator sheet covers the first electrode. In paragraph 13:
After covering the top of the first electrode,
forming a plurality of second electrodes by cutting the second electrode sheet supplied from the second electrode supply unit;
A second nozzle applying adhesive to a second area of the separator sheet while a second pressure roller presses the separator sheet guided from the separator guide;
Seating the second electrode on the second area of the separator sheet;
applying adhesive to the top of the second electrode using the second nozzle; and
The method of manufacturing an electrode assembly further comprising folding the separator sheet in a folding direction guided by the separator guide, so that the first area of the separator sheet covers the second electrode. In paragraph 14:
The separator guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are fixed,
A method of manufacturing an electrode assembly in which the table linearly reciprocates toward a first transfer device that transfers the first electrode toward the table and a second transfer device that transfers the second electrode toward the table. In paragraph 15:
The table is fixed,
The method of manufacturing an electrode assembly in which the separator guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller reciprocate linearly toward the first transfer device and the second transfer device. An electrode assembly in which electrodes and separator sheets are alternately stacked,
The electrode includes a first electrode and a second electrode,
The separator sheet has a zigzag shape formed by folding at least twice,
The separator sheet is folded with the first electrode seated on the first region of the separator sheet, so that the second region of the separator sheet covers the first electrode, and the second region is on the second region. The electrode is folded in a seated state so that the first area of the separator sheet covers the second electrode,
An adhesive layer is formed between the electrode and the separator sheet,
The adhesive layer is dissolved in an electrolyte solution for use in a battery cell,
The adhesive layer is formed by uniformly applying an adhesive to the first area and/or the second area. In paragraph 17:
The adhesive layer includes a first adhesive layer and a second adhesive layer,
The first adhesive layer is located between the bottom of the electrode and the separator sheet,
The second adhesive layer is an electrode assembly located between the top of the electrode and the separator sheet. In paragraph 18:
The first adhesive layer and the second adhesive layer are each formed by applying an adhesive in the form of a plurality of dots. A battery cell comprising the electrode assembly of claim 17,
Comprising a battery case that accommodates the electrode assembly together with an electrolyte,
A battery cell in which the adhesive layer is dissolved in the electrolyte solution.