JP2024514334A - Electrode assembly, its manufacturing device, and its manufacturing method - Google Patents

Abstract

An electrode assembly manufacturing apparatus according to an embodiment of the present invention includes an electrode supplying unit that provides an electrode sheet on which a plurality of electrodes are formed, a separation membrane supplying unit that provides a separation membrane sheet that is folded when the electrodes are placed thereon to cover the electrodes and be laminated with the electrodes, a table that places the electrodes on an upper surface thereof so as to have the separation membrane sheet folded between the electrodes to form the electrode assembly, a separation membrane guide that guides the folding direction of the separation membrane sheet, a pair of applicators that apply adhesive to at least a portion of the separation membrane sheet and/or the electrodes placed on the table, and a pair of pressure rollers that pressurize the separation membrane sheet guided by the separation membrane guide.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0124049 filed on September 16, 2021 and Korean Patent Application No. 10-2022-0114322 filed on September 8, 2022, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

The present invention relates to an electrode assembly, its manufacturing apparatus, and its manufacturing method, and more specifically to an electrode assembly in which electrodes and a separator sheet are stacked in a Z-folding type, and which can prevent the electrodes from coming off from their fixed positions, its manufacturing apparatus, and its manufacturing method.

Generally, types of secondary batteries include nickel cadmium batteries, nickel hydride batteries, lithium ion batteries, and lithium ion polymer batteries. Such secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs (registered trademarks), Portable Game Devices, Power Tools, and E-bikes, but also in electric vehicles and hybrid vehicles. It is also applied to large products that require high output, such as power storage devices that store surplus generated power and new renewable energy, and backup power storage devices.

In order to manufacture such a secondary battery, first, a positive electrode and a negative electrode are manufactured by coating an electrode active material slurry on a positive electrode current collector and a negative electrode current collector, and then these are laminated on both sides of a separator. By doing so, an electrode assembly having a predetermined shape is formed. Then, the electrode assembly is housed in the battery case, and the battery case is sealed after the electrolyte is injected.

Electrode assemblies are classified into various types. For example, a simple stack type (Simple Stack Type) in which a unit cell is not manufactured and the positive electrode, separation membrane, and negative electrode are simply stacked across each other, and after the unit cell is manufactured using the positive electrode, separation membrane, and negative electrode first, , a lamination and stack type (L&S) in which such unit cells are stacked, a plurality of unit cells are attached to one side of a separation membrane sheet with a long length on one side, separated from each other, and the separation membrane sheet is stacked from one end. Stack & Folding type (S&F, Stack & Folding Type) that repeatedly folds in the same direction, multiple electrodes or unit cells are alternately attached to one side and the other side of a long separation membrane sheet, and separation is performed. There is a Z-folding type in which a membrane sheet is folded in a specific direction from one end and then folded in the opposite direction alternately. Among these, the Z-fold type has a high degree of alignment and electrolyte impregnation, and has been frequently used recently.

However, in the conventional Z-folding method, a separate laminating process is not performed after the electrodes and the separation membrane sheet are laminated, so the electrodes and the separation membrane sheet are not adhered to each other, and the electrodes do not stay in place. There was a problem with leaving. In order to solve this problem, a separate lamination process was performed after laminating the electrodes and the separation membrane sheet, but the overall thickness of the laminate in which the electrodes and the separation membrane sheet were laminated became thicker. Therefore, there was a problem that heat was not transmitted to the inside of the laminate, resulting in a decrease in adhesive strength. Further, since such a separate laminating process is performed, there is a problem in that the electrodes may come off from their regular positions during the process of transporting the stacked body. Such a problem becomes more serious when the adhesive force of the separation membrane sheet itself is low depending on the material of the separation membrane sheet.

Accordingly, there is a need to develop electrode assemblies, including Z-folding electrode assemblies, devices for manufacturing the same, and methods for manufacturing the same, which improve battery cell performance while preventing the electrodes from falling out of their fixed positions. .

The problem to be solved by the present invention is to provide an electrode assembly of a Z-folding type in which an electrode and a separation membrane sheet are laminated, which can prevent the electrode from coming off from a fixed position, and an apparatus for manufacturing the same. , and a manufacturing method thereof.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and any problems not mentioned will become clear to a person having ordinary knowledge in the technical field to which the present invention pertains from this specification and the attached drawings. will be understood.

An electrode assembly manufacturing apparatus according to one embodiment of the present invention includes an electrode supplying unit that provides an electrode sheet on which a plurality of electrodes are formed, a separation membrane supplying unit that provides a separation membrane sheet that is folded when the electrodes are placed to cover the electrodes and to be laminated with the electrodes, a table that places the electrodes on its upper surface so that the separation membrane sheet is folded between the electrodes to form the electrode assembly, a separation membrane guide that guides the folding direction of the separation membrane sheet, a pair of applicators that apply adhesive to at least a portion of the separation membrane sheet and/or the electrodes placed on the table, and a pair of pressure rollers that pressurize the separation membrane sheet guided by the separation membrane guide.

The pair of pressure rollers may be located between the table and the separation membrane 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 a second electrode provided with a second electrode sheet on which a plurality of second electrodes are formed. and a supply unit.

The electrode assembly manufacturing apparatus may further include 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.

The pair of applicators may include a first nozzle and a second nozzle, and each of the pair of applicators may apply an adhesive to the separation membrane sheet or the electrode located on the table.

The first nozzle and the second nozzle are arranged on both sides of the separation membrane guide.

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 separation membrane guide, and the second pressure roller is located between the first nozzle and the separation membrane guide. A pressure roller may be located between the second nozzle and the separation membrane guide.

The first electrode may be placed on a first region of the separation membrane sheet, and the second electrode may be placed on a second region of the separation membrane sheet.

It may further include a first header that adsorbs the first electrode and places it in the first region, and a second header that adsorbs the second electrode and places it in the second region.

The separation membrane guide, the pair of applicators, and the pair of pressure rollers are fixed, and the table can move linearly back and forth toward the first transfer device and the second transfer device.

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

The electrode assembly manufacturing apparatus may further include a moving box that houses the separation membrane guide and the pair of applicators therein.

A method for manufacturing an electrode assembly according to another embodiment of the present invention includes the steps of: cutting a first electrode sheet provided from a first electrode supply unit to form a plurality of first electrodes; The separated separation membrane sheet is guided along a separation membrane guide, and the separation membrane sheet guided from the separation membrane guide is placed on a table with a first pressure roller pressurizing the separation membrane sheet, a first nozzle applying adhesive to a first region of a separation membrane sheet; a step of placing the first electrode on the first region of the separation membrane sheet; and a first nozzle disposed above the first electrode. applying an adhesive; and folding the separator sheet in a folding direction guided by the separator guide so that a second region of the separator sheet covers the first electrode.

After the step of covering the upper part of the first electrode, the method may further include the steps of cutting the second electrode sheet supplied from the second electrode supply unit to form a plurality of second electrodes, applying adhesive to the second region of the separation membrane sheet with a second nozzle while the separation membrane sheet guided from the separation membrane guide is pressed by a second pressure roller, placing the second electrode on the second region of the separation membrane sheet, applying adhesive to the upper part of the second electrode with the second nozzle, and folding the separation membrane sheet in a folding direction guided by the separation membrane guide so that the first region of the separation membrane sheet covers the second electrode.

The separation membrane guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are fixed, and the table can move linearly back and forth toward the first transfer device and the second transfer device.

The table is fixed, and the separation membrane guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are directed toward the first transfer device and the second transfer device. It can perform linear reciprocating motion.

An electrode assembly in which electrodes and separator sheets are alternately stacked according to another embodiment of the present invention, wherein the electrodes include a first electrode and a second electrode, and the separator sheet is stacked at least twice. The separation membrane sheet has a zigzag shape formed by folding, and the separation membrane sheet is folded with the first electrode placed on the first region of the separation membrane sheet, and the separation membrane sheet is A second region covers the first electrode, and the second region is folded with the second electrode placed on the second region, and the first region of the separation membrane sheet covers the second electrode. An adhesive layer is formed between the electrode and the separator sheet, and the adhesive layer is dissolved in an electrolyte for use in a battery cell.

The adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is located between the lower part of the electrode and the separation membrane sheet, and the second adhesive layer is located between the lower part of the electrode and the separator sheet. The separator sheet may be located between the upper portion and the separator sheet.

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

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

According to an embodiment, the present invention provides an electrode assembly of a Z-folding type in which an electrode and a separator sheet are laminated, and an adhesive is pre-coated on the upper and lower parts of the electrode, an apparatus for manufacturing the same, and an electrode assembly thereof. A manufacturing method that prevents an electrode from coming off from a fixed position.

The effects of the present invention are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those having ordinary knowledge in the technical field to which the present invention pertains from this specification and the attached drawings. Probably.

4 is a flowchart of a method for manufacturing an electrode assembly according to an embodiment of the present invention. 1 is a perspective view schematically showing a part of an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing how adhesive is applied to a first region of a separation membrane sheet while a table moves linearly in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing how a first electrode is placed on a first region of a separation membrane sheet in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating a state in which an adhesive is applied to an upper part of a first electrode while a table moves linearly in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing how adhesive is applied to a second area of a separation membrane sheet while a table moves linearly in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. 4 is a schematic view illustrating a state in which a second electrode is placed in a second region of a separator sheet in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. FIG. 6 is a schematic diagram showing how adhesive is applied to a first region of a separation membrane sheet while a first nozzle moves linearly in an electrode assembly manufacturing apparatus according to another embodiment of the present invention. FIG. 6 is a schematic diagram showing how a first electrode is placed on a first region of a separation membrane sheet in an electrode assembly manufacturing apparatus according to another embodiment of the present invention. FIG. 6 is a schematic diagram illustrating how adhesive is applied to the top of the first electrode while the first nozzle moves linearly in an electrode assembly manufacturing apparatus according to another embodiment of the present invention. In the electrode assembly manufacturing apparatus according to an embodiment of the present invention, the second nozzle moves linearly to apply adhesive to the second region of the separation membrane sheet, and to place the second electrode on the second region of the separation membrane sheet. FIG. FIG. 2 is a cross-sectional view of an electrode assembly according to one embodiment of the present invention. FIG. 1 is an exploded perspective view of a battery cell according to an embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement them. The invention can be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, unnecessary parts will be omitted, and the same or similar components will be denoted by the same reference numerals throughout the specification.

Further, 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 drawings. In the drawings, the thickness of various layers and regions are exaggerated for clarity. In the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

In addition, throughout the specification, when a part is said to "include" a certain component, unless there is a specific statement to the contrary, this does not mean that other components are excluded, but that it can further include other components. means.

Furthermore, throughout the specification, when we say "on a plane" we mean when we look at the target part from above, and when we say "on a cross section" we mean when we look at a cross section of the target part taken vertically from the side. It means when you see it.

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

FIG. 1 is a flowchart of a method for manufacturing an electrode assembly according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing a part of an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing how a first electrode is placed on a first region of a separation membrane sheet in an electrode assembly manufacturing apparatus according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing how a first electrode is placed on a first region of a separation membrane sheet in an 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 includes an electrode supplying unit provided with an electrode sheet on which a plurality of electrodes are formed, and folding when the electrodes are placed to cover the electrodes; a separation membrane supply unit provided with a separation membrane sheet to be laminated with the electrode; and a separation membrane supply unit with the electrode placed on top so as to have the separation membrane sheet folded between the electrodes to form the electrode assembly. a table on which the separation membrane sheet is placed, a separation membrane guide that guides the folding direction of the separation membrane sheet, and a pair of nozzles that apply an adhesive to at least a portion of the separation membrane sheet and/or the electrode placed on the table; and a pair of pressure rollers that press the separation membrane sheet guided from the separation membrane guide.

Referring to FIGS. 1 to 3, the method for manufacturing an electrode assembly according to an embodiment of the present invention includes a step S101 of cutting an electrode sheet (a first electrode sheet 1111, a second electrode sheet 1121) to form an electrode 11. , a step S102 in which the separation membrane sheet 122 is placed on the table 16 and an adhesive is applied to the separation membrane sheet 122, a step S103 in which the electrode 11 is placed on the separation membrane sheet 122, and the upper part of the electrode 11 and the separation membrane The method includes a step S104 in which an adhesive is applied to the sheet 122, and a step S105 in which the separator sheet 122 is folded to cover the electrodes 11.

Accordingly, in the electrode assembly manufacturing method according to this embodiment, when the electrode 11 and the separation membrane sheet 122 are stacked in the Z-folding type, the adhesive is applied to the upper and lower parts of the electrode 11, and the electrode 11 is It can be prevented from leaving the fixed position.

Each step shown in the flowchart of FIG. 1 will be specifically explained below with reference to FIGS. 2 to 7.

An electrode assembly manufacturing apparatus (cell manufacturing apparatus 1) according to an embodiment of the present invention includes electrode reels (a first electrode reel 111, a second electrode reel 112) from which an electrode sheet on which a plurality of electrodes 11 are formed is unwound. , a separation membrane reel 121 which is folded when the electrode 11 is placed, covers the electrode 11, and unwinds a separation membrane sheet 122 which is laminated with the electrode 11, and the electrode 11 and the separation membrane sheet 122 are placed on the upper surface. A table 16, a separation membrane guide 125 that guides the folding direction of the separation membrane sheet 122, a pair of nozzles 17 that applies adhesive to at least a portion of the separation membrane sheet 122 or the electrode 11 placed on the table 16, and a separation membrane guide 125 that guides the folding direction of the separation membrane sheet 122. It includes a pair of pressure rollers 130 that press the separation membrane sheet 122 guided from the membrane guide 125. The electrode reels 111 and 112 may be an example of the electrode supply unit described above, and the separation membrane reel 121 may be an example of the separation membrane supply unit described above. Furthermore, the pair of nozzles 17 may be one example of the applicator described above.

The electrode reels 111 and 112 include a first electrode reel 111 that unwinds a first electrode sheet 1111 on which a plurality of first electrodes 1112 are formed, and a second electrode sheet 1121 on which a plurality of second electrodes 1122 are formed. The second electrode reel 112 may be taken out.

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, such electrode sheets 1111 and 1121 are cut to form electrodes 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. Further, 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 can be manufactured by applying a slurry of an electrode active material, a conductive agent, 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 that is commonly used in the technical field is included in this 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 a positive electrode, the second electrode 1122 may be a negative electrode. As another example, if the first electrode 1112 is a negative electrode, the second electrode 1122 may be a positive electrode.

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

The table 16 is stacked with the electrode 11 and the separation membrane sheet 122 placed on the top surface. More preferably, the upper surface of the table 16 is formed substantially flat so that the electrode 11 and the separation membrane sheet 122 can be stably laminated.

The table 16 is arranged 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. As an example, in FIG. 3, it is possible to move forward and backward along the horizontal direction, and it is possible to perform linear reciprocating motion toward the first electrode reel 111 and the second electrode reel 112.

As a result, the table 16 moves back and forth linearly between the first electrode reel 111 and the second electrode reel 112, allowing the electrodes 11 to be stacked on the table 16 more quickly and assisting in folding the separation membrane sheet 122 of the separation membrane guide 125, thereby improving process speed and efficiency.

The electrode assembly manufacturing device (cell manufacturing device 1) according to this embodiment includes a first transfer device 141 that transfers the first electrode 1112 toward the table 16, and a second transfer device 141 that transfers the second electrode 1122 toward the table 16. A transfer device 142 may also be included. Here, the first transfer device 141 may transfer the first electrode 1112, which is formed by cutting the first electrode sheet 1111 unwound from the first electrode reel 111, toward the table 16. Further, the second transfer device 142 can transfer the second electrode 1122, which is formed by cutting the second electrode sheet 1121 unwound from the second electrode reel 112, toward the table 16.

As a result, in this embodiment, the first electrode 1112 and the second electrode 1122 can be transported to both sides of the table 16 via the first transport device 141 and the second transport device 142, respectively, making it easy to alternately stack the first electrode 1112 and the second electrode 1122 on the separation membrane sheet 122.

Referring to FIGS. 2 to 4, the electrode assembly manufacturing apparatus 1 according to the present embodiment may include headers 151 and 152 that adsorb the electrode 11 and place it on the separation membrane sheet 122. More specifically, the headers 151 and 152 include a first header 151 that adsorbs the first electrode 1112 and places it on the separation membrane sheet 122, and a second header 151 that adsorbs the second electrode 1122 and places it on the separation membrane sheet 122. A second header 152 may also be included. Here, the first header 151 and the second header 152 can each move toward the table 16. As an 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 can adsorb the first electrode 1112 transferred toward the table 16 by the first transfer device 141, and the second header 152 can adsorb the first electrode 1112 transferred toward the table 16 by the second transfer device 142. The second electrode 1122 transferred toward the electrode 16 can be attracted. Further, the first header 151 and the second header 152 can move linearly 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 can stably place the electrode 11 on the separation membrane sheet 122. .

In addition, the headers (first header 151, second header 152) are positioned as necessary after measuring the presence or absence of misalignment of the first electrode 1112 or second electrode 1122 for each first electrode 1112 or second electrode 1122. By correcting this, it is possible to accurately place the separation membrane sheet 122 at a desired position on the separation membrane sheet 122 located on the table 16. Accordingly, in this embodiment, the degree of alignment between the electrodes 11 and the separation membrane sheet 122 stacked and aligned on the table 16 can be further improved.

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

Here, the first nozzle 171 can form a first adhesive layer 1710 by applying adhesive to a first region 1221 of the separation membrane sheet 122 placed on the table 16, as shown in FIG. More specifically, as the table 16 moves linearly toward the first transfer device 141 as shown in FIG. A first adhesive layer 1710 may be formed. Thereafter, the first electrode 1112 can be placed on the first region 1221 of the separation membrane sheet 122 on which the first adhesive layer 1710 is formed.

Here, the first region 1221 of the separation membrane sheet 122 refers to a region of the separation membrane sheet 122 to which the first electrode 1112 is attached. In some cases, the first region 1221 refers to a region of the separator sheet 122 to which the first electrode 1112 is attached while covering the second electrode 1122. The second region 1222 refers to a region of the separation membrane sheet 122 to which the second electrode 1122 is attached while covering the first electrode 1112. In other words, the first electrode 1112 can be placed on the first region 1221 of the separation membrane sheet 122, and the second electrode 1122 can be placed on the second region 1222 of the separation membrane sheet 122.

Here, it is preferable that the adhesive is evenly applied to the first region 1221 of the separator sheet 122. However, if the adhesive is applied to the entire surface of the first region 1221 of the separator sheet 122, the amount of adhesive applied may be excessive. In this case, the adhesive may flow to the outside of the separator sheet 122 and contaminate other parts, and when a secondary battery is manufactured, the function of producing electricity may not be smooth.

Accordingly, in this embodiment, the adhesive is preferably applied to the first region 1221 of the separation membrane sheet 122 using a spot coating method in which the adhesive is applied in dots or a line coating method in which the adhesive is applied in a linear manner. That is, the first adhesive layer 1710 is preferably formed in a spot pattern or a line pattern.

On the other hand, if the amount of adhesive applied is too small, the electrodes 11 may still not be fixed to the separator sheet 122 while the cells are moving, and may come off from the fixed position. Therefore, it is preferable that the spacing between the areas where the adhesive is applied is not too wide.

Meanwhile, the adhesive included in the adhesive layer (first adhesive layer 1710) located between the first region 1221 of the separator sheet 122 and the first electrode 1112 can be dissolved in the electrolyte. More specifically, when the first adhesive layer 1710 is impregnated with an electrolyte, the adhesive included in the first adhesive layer 1710 can be dissolved in the electrolyte. Here, the adhesive being dissolved can mean that the adhesive is dissolved into the electrolyte. That is, it can mean that the area of the first adhesive layer 1710 is reduced, or the first adhesive layer 1710 is completely eliminated, and no first adhesive layer 1710 remains in the first area 1221 of the separation membrane sheet 122.

As an example, the adhesive may be an acrylate adhesive. That is, in this embodiment, by applying an acrylate adhesive as the adhesive to the first region 1221 of the separation membrane sheet 122, the adhesive can be dissolved in the electrolytic solution contained in the final battery cell.

Accordingly, in this embodiment, the first adhesive layer 1710 can fix the first electrode 1112 to the first region 1221 of the separation membrane sheet 122 during the manufacturing process and prevent it from coming off from a fixed position. In addition, the first adhesive layer 1710 is dissolved in the electrolyte contained in the final battery cell, and does not hinder the movement of lithium ions between the electrode and the separator, thereby further improving the performance of the battery cell.

Referring to FIGS. 3 and 4, the electrode assembly manufacturing apparatus (cell manufacturing apparatus 1) according to the present embodiment includes a pair of pressure rollers 130 that press the separation membrane sheet 122 guided from the separation membrane guide 125. be able to. The pair of pressure rollers 130 can be designed to deflect the separation membrane sheet 122 between the separation membrane guide 125 and the table 16. More specifically, the pair of pressure rollers 130 can be located between the table 16 and the separation membrane guide 125. Here, the pair of pressure rollers 130 may be fixed. As an example, the pressure roller 130 may not move.

For example, the pair of pressure rollers 130 may have a configuration in which a pair of rolls are arranged horizontally. For example, as shown in FIG. 3, the pressure rollers 130 are spaced apart from each other in the horizontal direction. The pressure roller 130 can press one surface of the separation membrane sheet 122. However, the form of the pressure roller 130 is not limited to this, and any form that can press one surface of the separation membrane sheet 122 is included in this embodiment.

As a result, at least one of the pair of pressure rollers 130 presses one surface of the separation membrane sheet 122 to keep the tension, direction and/or position of the separation membrane sheet 122 constant, as shown in FIGS. 3 and 4. can be controlled. Therefore, as shown in FIGS. 3 and 4, while the table 16 moves relative to the separation membrane guide 125, the pair of pressure rollers 130 The direction and/or distance of the separation membrane sheet 122 can be maintained.

In particular, the 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 may be located between the first nozzle 171 and the separation membrane guide 125, and the second pressure roller 1302 may be located between the second nozzle 172 and the separation membrane guide 125. That is, the first nozzle 171 and the second nozzle 172 may apply adhesive onto the separation membrane sheet 122 pressed by at least one of the pair of pressure rollers 130.

For example, as shown in FIG. 3, the first pressure roller 1301 presses one surface of the separation membrane sheet 122 during the process in which the adhesive is applied from the first nozzle 171 to the first region 1221 of the separation membrane sheet 122. be able to. As a result, the first pressure roller 1301 can maintain a constant height difference between the first region 1221 of the separation membrane sheet 122 and the first nozzle 171, and the amount of application of the first adhesive layer 1710 or The coating thickness is relatively uniform. This can be similarly explained in the case of the second pressure roller 1302.

Further, in a state where the separation membrane sheet 122 is pressed by the first pressure roller 1301, the first nozzle 171 has a height or an angle between the first region 1221 of the separation membrane sheet 122 and the first nozzle 171. Can be adjusted. As an example, the first nozzle 171 is moved with respect to the first region 1221 of the separation membrane sheet 122 so that the height difference between the first region 1221 of the separation membrane sheet 122 and the first nozzle 171 is constant. Alternatively, the separation membrane sheet 122 can be rotated so that the angle between the first region 1221 and the first nozzle 171 is constant.

As a result, when the separation membrane sheet 122 is pressed by the first pressure roller 1301, the height difference or angle between the first nozzle 171 and the first region 1221 of the separation membrane sheet 122 can be maintained constant, and the reliability of the application of the adhesive applied from the first nozzle 171 to the first region 1221 of the separation membrane sheet 122 can be improved. This can also be explained in the same way when the second nozzle 172 applies adhesive to the second region 1222 of the separation membrane sheet 122 when the separation membrane sheet 122 is pressed by the second pressure roller 1302, as in Figures 6 and 7.

FIG. 5 is a schematic diagram illustrating how adhesive is 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. FIG. 6 is a schematic diagram showing how adhesive is applied to the second region of the separation membrane 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 are arranged on both sides with the separation membrane sheet 122 interposed therebetween.

That is, as shown in FIG. 5, the first nozzle 171 applies adhesive to at least a portion of the upper part of the first electrode 1112 before the second region 1222 of the separation membrane sheet 122 covers the upper part of the first electrode 1112. A second adhesive layer 1750 can be formed by coating. Further, as shown in FIG. 6, after the second region 1222 of the separation membrane sheet 122 covers the upper part of the first electrode 1112, the second nozzle 172 is attached to at least a part of the second region 1222 of the separation membrane sheet 122. The first adhesive layer 1710 may be formed by applying a coating agent.

The same holds true for the opposite case, where the second nozzle 172 contacts at least a portion of the upper part of the second electrode 1122 before the first region 1221 of the separation membrane sheet 122 covers the upper part of the second electrode 1122. A second adhesive layer 1750 may be formed by applying an adhesive. Furthermore, after the first region 1221 of the separation membrane sheet 122 covers the upper part of the second electrode 1122, the first nozzle 171 applies an adhesive to at least a part of the first region 1221 of the separation membrane sheet 122. 1 adhesive layer 1710 can be formed.

Here, the table 16 can linearly reciprocate left and right with respect to the pair of nozzles 17. In other words, the table 16 applies adhesive to at least a portion of the upper part of the electrode 11 or the separation membrane sheet 122 while moving linearly in the direction toward the first transfer device 141 or the second transfer device 142 with respect to the pair of nozzles 17. Can be applied.

Further, the adhesive applied from the pair of nozzles 17 and the second adhesive layer 1750 can be explained in the same manner 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 separation membrane sheet 122, and the second adhesive layer 1750 is formed by applying an adhesive between the upper part of the electrode 11 and the separation membrane sheet 122. It is divided into those formed by applying an adhesive between the sheet 122 and the sheet 122.

Furthermore, as shown in FIG. 5 and FIG. 6, before the second region 1222 of the separation membrane sheet 122 covers the upper part of the first electrode 1112, the first nozzle 171 can apply adhesive to at least a portion of the upper part of the first electrode 1112 to form the second adhesive layer 1750, and at the same time, the second nozzle 172 can apply adhesive to at least a portion of the second region 1222 of the separation membrane sheet 122 to form the first adhesive layer 1710. This is the opposite case, and before the first region 1221 of the separation membrane sheet 122 covers the upper part of the second electrode 1122, the second nozzle 172 can apply adhesive to at least a portion of the upper part of the second electrode 1122 to form the second adhesive layer 1750, and at the same time, the first nozzle 171 can apply adhesive to at least a portion of the first region 1221 of the separation membrane sheet 122 to form the first adhesive layer 1710.

As a result, in this embodiment, the pair of nozzles 17 can simultaneously apply the adhesive to the upper part of the separation membrane sheet 122 or the electrode 11, reducing the process time of the adhesive application process and further improving process efficiency. can.

Further, as shown in FIG. 5, in the pair of pressure rollers 130, the second adhesive layer 1750 formed on the top of the first electrode 1112 may be separated from each other. This can prevent the adhesive applied to the second adhesive layer 1750 formed on the first electrode 1112 from directly contacting the pair of pressure rollers 130 when the table 16 moves linearly.

Furthermore, as shown in FIG. 6, the second pressure roller 1302 presses one surface of the separation membrane sheet 122 while moving the second area 1222 of the separation membrane sheet 122 and the first electrode in the opposite direction to the moving direction of the table 16. 1112, the first adhesive layer 1710 and/or the second adhesive layer 1750 can be pressurized. As a result, 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 separation membrane sheet 122 are more uniformly applied. This can be similarly explained when the first pressure roller 1301 presses the first region 1221 of the separation membrane sheet 122 covering the second electrode 1122 on which the first adhesive layer 1710 is formed.

Figure 7 is a schematic diagram showing how the separation membrane guide moves linearly and the second electrode is placed on the second region of the separation membrane sheet in an electrode assembly manufacturing apparatus according to one embodiment of the present invention.

Referring to FIG. 6 and FIG. 7, in this embodiment, the folding direction of the separation membrane sheet 122 is guided by the separation membrane guide 125. Here, the pair of pressure rollers 130 can assist the separation membrane guide 125 in guiding the folding direction of the separation membrane sheet 122.

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

Furthermore, the separation membrane guide 125 can be positioned above and below the pair of nozzles 17, respectively. However, the position and number of the separation membrane guides 125 are not limited thereto, and any position and number that can control the folding direction of the separation membrane sheet 122 are included in this embodiment.

Further, the separation membrane guide 125 may be fixed together with the pair of nozzles 17 and the pair of pressure rollers 130. Here, the table 16 linearly reciprocates toward the first transfer device 141 and the second transfer device 142 with the separation membrane guide 125 as a reference, and the separation membrane sheet 122 guided by the separation membrane guide 125 is transferred to the separation membrane guide 125. The separator sheet 122 can cover the electrode 11 by being folded along the moving direction of the separator sheet 125 .

As an example, referring to FIG. 6 and FIG. 7, with the first electrode 1112 placed on the first region 1221 of the separation membrane sheet 122, the table 16 moves linearly toward the second transfer device 142 so that the second region 1222 of the separation membrane sheet 122 covers the top of the first electrode 1112.

As a result, as the table 16 reciprocates in a straight line, the process of applying the adhesive using the pair of nozzles 17 and the process of folding the separation membrane sheet 122 using the separation membrane guide 125 can be performed at the same time, reducing process time. Process efficiency can be further improved.

Using such an electrode assembly manufacturing apparatus (cell manufacturing apparatus 1), an electrode assembly manufacturing method according to an embodiment of the present invention can be carried out 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 a plurality of first electrodes 1112 are cut. is formed (S101).

On the other hand, when the separation membrane sheet 122 is unwound from the separation membrane reel 121, the separation membrane sheet 122 is placed on the upper surface of the table 16 under pressure by the first pressure roller 1301, and the first nozzle 171 , an adhesive is applied to the separation membrane sheet 122 (S102). At this time, the table 16 moves linearly toward the first transfer device 141, and as the table 16 moves, the first nozzle 171 forms the first adhesive layer 1710 on the first region 1221 of the separation membrane sheet 122. .

Further, referring to FIGS. 1 and 4, the first header 151 can move linearly onto the table 16 while adsorbing the first electrode 1112. Then, if the first header 151 is located above the table 16, the first header 151 will be located in the first region of the separation membrane sheet 122 on which the first adhesive layer 1710 is formed, as shown in FIG. The first electrode 1112 is placed on the electrode 1221 (S103).

Also, referring to FIGS. 1, 5, and 6, after the first electrode 1112 is placed on the first region 1221 of the separation membrane sheet 122, the table 16 moves toward the second transfer device 142. As a result, the first nozzle 171 applies adhesive onto the first electrode 1112 to form a second adhesive layer 1750 . Further, by moving the table 16 toward the second transfer device 142 with one side of the separation membrane sheet 122 being pressurized by the second pressure roller 1302, the second nozzle 172 also moves the separation membrane sheet 122. An adhesive is applied to the second region 1222 to form the first adhesive layer 1710 (S104).

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

On the other hand, 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 attracts the second electrode 1122. Then, if the second region 1222 of the separation membrane sheet 122 covers the first electrode 1112, the second header 152 adsorbing the second electrode 1122 moves toward the top of the second region 1222. , the second electrode 1122 is placed on the second region 1222 where the first adhesive layer 1710 is formed.

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

Thereafter, by moving the table 16 toward the first transfer device 141 with reference to the separation membrane guide 125, the other side of the separation membrane sheet 122 is folded, and the first region 1221 of the separation membrane sheet 122 is covered with the second adhesive layer. 1750 is formed on the second electrode 1122.

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

If the electrode assembly manufacturing method according to the embodiment of the present invention is carried out, when the electrode 11 and the separation membrane sheet 122 are laminated in the Z-folding type, adhesive is applied to the upper and lower parts of the electrode 11, respectively. This can prevent the electrode 11 from coming off the fixed position.

Hereinafter, an 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 the same manner as the electrode assembly manufacturing apparatus (cell manufacturing apparatus 1) described above with reference to FIGS. Only the parts different from manufacturing apparatus 1) will be explained.

FIG. 8 is a schematic diagram showing how adhesive is applied to a first region of a separation membrane sheet while a first nozzle moves linearly in an 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. Thereby, the electrode 11 and the separation membrane sheet 122 can be stacked on the table 16 while the table 16a is fixed, and the degree of alignment of the electrode 11 and the separation membrane sheet 122 can be further improved.

In addition, the separation membrane guide 125, the first nozzle 171a, and the second nozzle 172a can move forward and backward along the horizontal direction in FIG. 7 between the first electrode reel 111 and the second electrode reel 112. As an example, the separation membrane guide 125, the first nozzle 171a, and the second nozzle 171b can move linearly back and forth left and right based on the table 16a. As an example, as shown in FIG. 8, the first nozzle 171a can apply adhesive to the first region 1221 of the separation membrane sheet 122 to form a first adhesive layer 1710 by moving linearly toward the second transfer device 142 based on the table 16a.

Further, the pair of pressure rollers 130 are movable together with the separation membrane guide 125, the first nozzle 171a, and the second nozzle 172a while pressing one surface of the separation membrane sheet 122. As an example, the first pressure roller 1301 is movable together with the second pressure roller 1302, the first nozzle 171a, and the second nozzle 172a while pressing one surface of the separation membrane sheet 122. Thereby, the pair of pressure rollers 130 can maintain the tension of the separation membrane sheet 122. At the same time, the height difference between the first nozzle 171a and the second nozzle 172a and the separation membrane sheet 122 can be maintained.

As an example, the electrode assembly manufacturing apparatus 2 of this embodiment may further include a moving box 18 that accommodates the separation membrane guide 125, the first nozzle 171a, and the second nozzle 172a. That is, in the electrode assembly manufacturing apparatus 2 of this embodiment, the separation membrane guide 125, the first nozzle 171a, and the second nozzle 172a can be moved simultaneously by moving the moving box 18.

As a result, the distance between the first nozzle 171a and the separation membrane guide 125 and the distance between the second nozzle 172a and the separation membrane guide 125 are maintained constant, and the distance between the first nozzle 171a and the second nozzle 172a is maintained constant. The application reliability of adhesives can be improved.

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

Using such an electrode assembly manufacturing apparatus (cell manufacturing apparatus 1a), an 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 a plurality of first electrodes 1112 are cut. is formed (S101).

On the other hand, when the separation membrane sheet 122 is unwound from the separation membrane reel 121, the separation membrane sheet 122 is placed on the upper surface of the table 16a under pressure by the first pressure roller 1301, and the first nozzle 171a is , an adhesive is applied to the separation membrane sheet 122 (S102). At this time, the first nozzle 171a forms the first adhesive layer 1710 on the first region 1221 of the separation membrane sheet 122 while moving linearly toward the second transfer device 142.

FIG. 9 is a schematic diagram showing how a first electrode is placed on a first region of a separation membrane sheet in an electrode assembly manufacturing apparatus according to another embodiment of the present invention.

Further, referring to FIGS. 1 and 9, the first header 151 can move linearly onto the table 16 while adsorbing the first electrode 1112. Then, if the first header 151 is located above the table 16a, as shown in FIG. The first electrode 1112 is placed on the electrode 1221 (S103).

FIG. 10 is a schematic diagram illustrating how adhesive is applied to the top of the first electrode while the first nozzle moves linearly in an electrode assembly manufacturing apparatus according to another embodiment of the present invention. FIG. 11 shows an electrode assembly manufacturing apparatus according to an embodiment of the present invention, in which adhesive is applied to a second area of a separation membrane sheet while a second nozzle moves linearly, and a second adhesive is applied to a second area of a separation membrane sheet. FIG. 3 is a schematic diagram showing how electrodes are placed.

Referring to FIG. 1, FIG. 10 and FIG. 11, after the first electrode 1112 is placed on the first region 1221 of the separation membrane sheet 122, the first nozzle 171a moves toward the first transfer device 141 to apply adhesive to the top of the first electrode 1112 to form the second adhesive layer 1750. In addition, with one side of the separation membrane sheet 122 being pressed by the second pressure roller 1302, the second nozzle 172a also moves toward the first transfer device 141 to apply adhesive to the second region 1222 of the separation membrane sheet 122 to form the first adhesive layer 1710 (S104).

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

On the other hand, 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 attracts the second electrode 1122. Then, if the second region 1222 of the separation membrane sheet 122 covers the first electrode 1112, the second header 152 adsorbing the second electrode 1122 moves toward the top of the second region 1222. , the second electrode 1122 is placed on the second region 1222 where the first adhesive layer 1710 is formed.

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

Then, the separation membrane guide 125 and the pair of pressure rollers 130 move toward the second transfer device 142 based on the table 16a, so that the other side of the separation membrane sheet 122 is folded and the first region 1221 of the separation membrane sheet 122 covers the second electrode 1122 on which the second adhesive layer 1750 is formed.

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

If the electrode assembly manufacturing method according to the embodiment of the present invention is carried out, when the electrode 11 and the separation membrane sheet 122 are laminated in the Z-folding type, adhesive is applied to the upper and lower parts of the electrode 11, respectively. This can prevent the electrode 11 from coming off the fixed position.

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

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

Here, the separation membrane sheet 122 is folded with the first electrode 1112 placed on the first region 1221 of the separation membrane sheet 122, and the second region 1222 of the separation membrane (separation membrane sheet 122) is placed on the first region 1221 of the separation membrane sheet 122. 1 electrode 11 is covered. Further, the separation membrane sheet 122 is folded with the second electrode 1122 placed on the second region 1222, and the first region 1221 of the separation membrane sheet 122 covers the second electrode 1122.

In particular, in the electrode assembly 10 according to this embodiment, the electrodes 11 are stacked one by one on the first region 1221 or the second region 1222 of the separation membrane sheet 122. At this time, after measuring the presence or absence of displacement, the electrodes 11 are stacked at accurate positions on the separation membrane sheet 122, with the positions corrected as necessary. Accordingly, in the electrode assembly 10 according to this embodiment, the degree of alignment between the electrode 11 and the separator sheet 122 can be further improved.

Here, an adhesive layer 1700 is formed between the electrode 11 and the separation membrane sheet 122. More specifically, 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 lower part of the electrode 11 and the separator sheet 122, and the second adhesive layer 1750 may be located between the upper part of the electrode 11 and the separator sheet 122.

As an example, the first adhesive layer 1710 and the second adhesive layer 1750 may each be formed by applying adhesive in the shape of multiple dots. However, as previously described in the battery cell manufacturing apparatus 1, the shape of the first adhesive layer 1710 and the second adhesive layer 1750 is not limited to this, and may be formed in a variety of shapes.

As a result, the electrode assembly 10 according to this embodiment has the adhesive layer 1700 formed between the electrode 11 and the separation membrane sheet 122, and even in the case of a low-cost separation membrane with extremely low adhesive strength, the electrode assembly 10 can Since the electrode 11 and the separation membrane are stably fixed to each other, the electrode 11 can be prevented from coming off from a fixed position. In addition, in the electrode assembly 10 of this embodiment, one separation membrane sheet 122 is folded to cover the upper and lower portions of the electrodes 11, so that the degree of alignment of the electrodes 11 and the efficiency of the process can be further improved. .

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

The separation membrane according to the embodiments described herein may be a CCS (Ceramic Coated Separator). Generally, a separation membrane includes a raw film and a coating layer formed on at least one surface of the raw film, and the coating layer can include alumina powder and a binder that aggregates these. . In SRS (Safety Reinforced Separator), the surface of the coating layer is coated with a large amount of binder, but in CCS, the surface of the coating layer is not coated with binder, or the binder content distributed on the surface is smaller than in SRS. quantity is very low. In the case of the CCS separation membrane according to this embodiment, the content of the binder coated on the surface of the coating layer of the separation membrane may be about 3 wt% or less. For example, the content of the binder coated on the surface of the coating layer of the separation membrane may be about 2 wt% or less, or about 1 wt% or less.

When the separation membrane is a CCS, the internal electrodes included in the electrode assembly are transferred without being fixed, so alignment may be disturbed during transfer. Of course, if the separation membrane is CCS, it can be fixed using heat and pressure, but the alignment of the internal electrodes will also be disrupted during the process of forming a stack of electrodes and separation membranes and then transferring them to a heat and pressure fixing device. Sometimes. Another disadvantage is that an expensive separation membrane with a high binder content must be used to attach the electrode and separation membrane using heat and pressure. In contrast, according to this embodiment, the fixing force can be increased while preventing the alignment of the internal electrodes from being disturbed during transportation.

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

7, FIG. 11, FIG. 12, and FIG. 13, a battery cell according to another embodiment of the present invention includes the electrode assembly 10 described above, the electrode assembly together with an electrolyte. The adhesive layer 1700 is dissolved in the electrolyte.

Here, a fixing member such as a fixing tape 30 may be attached to the outside of the electrode assembly 10. Thereby, the laminated alignment state of the electrode 11 and the separation membrane sheet 122 can be maintained. Such an electrode assembly 10 to which the fixing tape 30 is attached can be named a final electrode assembly 20.

The battery case 50 includes a storage part 60 into which the electrode assembly 10 or the final electrode assembly 20 is mounted, and a sealing part 70 that seals the outer periphery of the storage part 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 laminate sheet and includes an outer resin layer forming the outermost corner, a barrier metal layer for preventing penetration of substances, and an inner resin layer for sealing.

Further, the storage portion 60 of the battery case 50 may contain an electrolyte together with the electrode assembly 10. Here, the adhesive layer 1700 included in the electrode assembly 10 can be dissolved within the electrolyte. In particular, in the battery cell according to this embodiment, the adhesive layer 1700 included in the electrode assembly 10 can be dissolved in the electrolyte 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, the adhesive layer 1700 formed between the electrode 11 of the electrode assembly 10 and the separator sheet 122 is bonded to the surface of the electrode 11 when dissolved in the electrolyte. There is almost no adhesive 14 left, or it is completely gone.

In contrast, because the separation membrane sheet 122 is generally a porous sheet, some of the adhesive 14 may have permeated into the separation membrane sheet 122. However, even in the case of the adhesive layer 1700 that has permeated into the separation membrane sheet 122, it may be mostly or completely dissolved in the electrolyte, and during this process, traces of the application of the adhesive layer 1700 may remain on the separation membrane sheet 122.

Here, the application trace of the adhesive layer 1700 means that although no adhesive component contained in the adhesive layer 1700 remains, a part of the outer surface of the separation membrane sheet 122 has been deformed by the adhesive layer 1700. be able to. However, the application trace of the adhesive layer 1700 is not limited to this, and the application trace of the adhesive layer 1700 can be a trace that can confirm the presence or absence of adhesive application in various ways, such as a trace that can confirm the presence or absence of adhesive application with the naked eye. can mean As a result, the application trace of the adhesive layer 1700 formed on the separation membrane sheet 122 is formed at the same position where the adhesive is applied.

As a result, 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 (separator sheet 122), eliminating any unreacted areas caused by the adhesive layer 1700, preventing performance degradation and achieving excellent battery performance.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto. Various modifications and improvements of are also within the scope of the invention.

1, 1a: Cell manufacturing device 11: Electrode 16, 16a: Table 17: Nozzle 111: First electrode reel 112: Second electrode reel 121: Separation membrane reel 122: Separation membrane sheet 125: Separation membrane guide 131: First cutter 132: Second cutter 141: First transfer device 142: Second transfer device 151: First header 152: Second header 171, 171a: First nozzle 172, 172a: Second nozzle 1111: First electrode sheet 1112: No. 1 electrode 1121: Second electrode sheet 1122: Second electrode 1221: First region 1222: Second region 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 separation membrane supply unit that is folded when the electrode is placed thereon, and provides a separation membrane sheet that covers the electrode and is laminated with the electrode;
a table on which the electrodes are placed with the separator sheet folded between the electrodes to form an electrode assembly;
a separation membrane guide that guides the folding direction of the separation membrane sheet;
a pair of applicators that apply an adhesive to at least a portion of the separation membrane sheet and/or the electrodes placed on the table;
An electrode assembly manufacturing apparatus including a pair of pressure rollers that press the separation membrane sheet guided from the separation membrane guide. The electrode assembly manufacturing apparatus according to claim 1, wherein the pair of pressure rollers are located between the table and the separation membrane guide. The electrode supply unit includes:
a first electrode supply unit that is supplied with a first electrode sheet on which a plurality of first electrodes are formed;
The electrode assembly manufacturing apparatus according to claim 2, further comprising a second electrode supply unit that supplies a second electrode sheet on which a plurality of second electrodes are formed. a first transfer device that transfers the first electrode toward the table;
The electrode assembly manufacturing apparatus according to claim 3, further comprising a second transfer device that transfers the second electrode toward the table. The pair of applicators include a first nozzle and a second nozzle,
4. The electrode assembly manufacturing apparatus according to claim 3, wherein the pair of applicators apply the adhesive to the separation membrane sheet or the electrode located on the table, respectively. The electrode assembly manufacturing apparatus according to claim 5, wherein the first nozzle and the second nozzle are arranged on both sides of the separation membrane guide. the pair of pressure rollers includes a first pressure roller and a second pressure roller,
7. The apparatus of claim 6, wherein the first pressure roller is positioned between the first nozzle and the separation membrane guide, and the second pressure roller is positioned between the second nozzle and the separation membrane guide. the first electrode is placed on the first region of the separation membrane sheet,
The electrode assembly manufacturing apparatus according to claim 4, wherein the second electrode is placed on a second region of the separation membrane sheet. a first header that attracts the first electrode and places it on the first region;
The electrode assembly manufacturing apparatus according to claim 8, further comprising a second header that attracts the second electrode and places it on the second region. The separation membrane guide, the pair of applicators, and the pair of pressure rollers are fixed,
The electrode assembly manufacturing apparatus according to claim 8, wherein the table reciprocates linearly toward the first transfer device and the second transfer device. the table is fixed;
The electrode assembly manufacturing apparatus according to claim 8, wherein the separation membrane guide, the pair of applicators, and the pair of pressure rollers linearly reciprocate toward the first transfer device and the second transfer device. . The electrode assembly manufacturing apparatus according to claim 10, further comprising a moving box that houses the separation membrane guide and the pair of applicators therein. cutting a first electrode sheet provided from a first electrode supply unit to form a plurality of first electrodes;
A separation membrane sheet provided from a separation membrane supply unit is guided along a separation membrane guide, and the separation membrane sheet guided from the separation membrane guide is pressed by a first pressure roller. applying an adhesive to a first region of the separation membrane sheet with a first nozzle placed on a table;
placing the first electrode on an adhesive applied to a first region of the separator sheet;
the first nozzle applying the adhesive on the first electrode;
A method for manufacturing an electrode assembly, comprising folding the separation membrane sheet in a folding direction guided by the separation membrane guide, so that a second region of the separation membrane sheet covers the first electrode. After covering the upper part 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 separation membrane sheet while a second pressure roller presses the separation membrane sheet guided from the separation membrane guide;
placing the second electrode on a second region of the separation membrane sheet;
the second nozzle applying the adhesive on the second electrode;
The electrode assembly of claim 13, further comprising folding the separation membrane sheet in a folding direction guided by the separation membrane guide, so that a first region of the separation membrane sheet covers the second electrode. Three-dimensional manufacturing method. The separation membrane guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are fixed,
15. The method of manufacturing an electrode assembly according to claim 14, wherein the table reciprocates linearly toward a first transfer device and a second transfer device. the table is fixed;
The separation membrane guide, the first nozzle, the second nozzle, the first pressure roller, and the second pressure roller are linearly reciprocated toward the first transfer device and the second transfer device. 16. The electrode assembly manufacturing method according to 15. An electrode assembly in which electrodes and separation membrane sheets are alternately laminated,
The electrode includes a first electrode and a second electrode,
The separation membrane sheet has a zigzag shape formed by folding at least twice,
The separation membrane sheet is folded with the first electrode placed on a first region of the separation membrane sheet, and the second region of the separation membrane sheet covers the first electrode, The separation membrane sheet is folded with the second electrode placed on the second region, and the first region of the separation membrane sheet covers the second electrode,
an adhesive layer is formed between the electrode and the separation membrane sheet,
The adhesive layer is dissolved in an electrolyte for use in a battery cell electrode assembly. The adhesive layer includes a first adhesive layer and a second adhesive layer,
the first adhesive layer is located between the lower part of the electrode and the separation membrane sheet,
The electrode assembly of claim 17, wherein the second adhesive layer is located between an upper part of the electrode and the separator sheet. The electrode assembly according to claim 18, wherein the first adhesive layer and the second adhesive layer are each formed by applying adhesive in a plurality of dot shapes. A battery cell including the electrode assembly according to claim 17,
a battery case that houses the electrode assembly together with an electrolyte;
The adhesive layer is soluble in the electrolyte.

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