JP2023053788A - Battery electrode manufacturing device and battery electrode manufacturing method - Google Patents

Abstract

To supply and collect a mask on a substrate film with a simple configuration.SOLUTION: A battery electrode manufacturing device comprises: a rotary mask which is configured in a ring shape by connecting a plurality of hollow masks; and a supply part for supplying an electrode composition from an opening of a hopper internally holding the electrode composition onto the substrate film and to a position of the mask in an internal space. The rotary mask is rotated in a direction where a moving direction of a face abutting on the substrate film is coincident with a transfer direction of the substrate film, such that the plurality of masks are successively abutting on the substrate film. The supply part supplies the electrode composition to a position of the mask abutting on the substrate film in the internal space among the plurality of masks included in the rotary mask.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a battery electrode manufacturing apparatus and a battery electrode manufacturing method.

Lithium ion batteries are high-capacity secondary batteries and have been used in various applications in recent years. An electrode of a lithium ion battery is composed of an active material layer, a current collector layer, a separator, a frame enclosing the active material layer, and the like (see, for example, Patent Document 1).

The active material layer can be formed by supplying the electrode composition onto the substrate film and compressing it with a roll press or the like. Here, it is preferable that the supply of the electrode composition onto the substrate film is performed accurately in a desired position and in a desired shape.

In order to accurately supply the electrode composition onto the substrate film, it is conceivable to use a mask. That is, by disposing a hollow mask on the substrate film and supplying the electrode composition to the inner space of the mask, the electrode composition can be accurately supplied onto the substrate film.

Japanese Patent No. 6633866 Japanese Patent Application Laid-Open No. 2021-27043

When a mask is used when supplying the electrode composition, it is necessary to supply and collect the mask onto the substrate film. Here, it takes a long time to supply and collect the masks one by one, which may affect the manufacturing efficiency of the battery electrodes. On the other hand, as described in Patent Document 2, for example, it is conceivable to use a continuous endless mask to continuously supply and collect the mask onto the base film. However, the technique of Patent Literature 2 has a large-scale configuration and is costly to manufacture and operate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery electrode manufacturing apparatus and a battery electrode manufacturing method that realize supply and recovery of a mask onto a base film with a simple configuration. With the goal.

In order to achieve the above object, a battery electrode manufacturing apparatus according to the present invention provides a rotating mask formed in a ring shape by connecting a plurality of hollow masks, and an opening of a hopper holding an electrode composition therein. a supply unit that supplies the electrode composition to a position on the material film and in the internal space of the mask, wherein the rotating mask is configured to move the surface in contact with the base film and the direction of movement of the base film. By rotating in a direction coinciding with the conveying direction, a plurality of the masks are configured to sequentially abut against the base film, and the supply unit selects one of the plurality of masks included in the rotating mask. , the electrode composition is supplied to the position of the inner space of the mask that is in contact with the base film.

According to the battery electrode manufacturing apparatus and the battery electrode manufacturing method of the present invention, the supply and collection of the mask onto the base film can be realized with a simple configuration.

FIG. 1A is a schematic cross-sectional view of a single cell of a battery manufactured using the battery electrode manufacturing apparatus of the embodiment. FIG. 1B is a schematic cross-sectional view of a single cell of a battery manufactured using the battery electrode manufacturing apparatus of the embodiment. FIG. 2 is a schematic diagram of the battery electrode manufacturing apparatus of the embodiment. FIG. 3 is a diagram showing the rotating mask of the embodiment. FIG. 4 is a diagram for explaining supply of the electrode composition of the embodiment. FIG. 5 is a perspective view showing a rotating mask and an electrode composition supply device of the embodiment. FIG. 6 is a perspective view showing a rotating mask and an electrode composition supply device of the embodiment.

Embodiments to which the present invention is applied will be described below with reference to the drawings. In addition, in the drawings used in the following explanations, characteristic parts may be enlarged for the sake of convenience for the purpose of emphasizing the characteristic parts, and the dimensional ratios, etc. of each component may not necessarily be the same as the actual ones. do not have. Also, for the same purpose, some parts may be omitted from the drawings.

<Assembled battery (secondary battery)>
The battery electrode manufacturing apparatus and the battery electrode manufacturing method of the embodiments are applied, for example, to the manufacture of lithium ion batteries. Lithium ion batteries are assembled batteries that are modularized by combining a plurality of lithium ion single cells (also referred to as single cells or battery cells), or battery packs that are made by combining multiple such assembled batteries and adjusting the voltage and capacity. used in the form.

<Single cell (battery cell)>
1A and 1B are schematic cross-sectional views of the single cell 10. FIG. By combining a plurality of unit cells 10, the above assembled battery can be produced. For example, the single cell 10 has a positive electrode 20 a and a negative electrode 20 b as two electrodes (battery electrodes) and a separator 30 .

The single cell 10 of the embodiment is configured such that the electrode active material layer 22 is thicker than the frame 35, as shown in FIG. 1A. In addition, as shown in FIG. 1B, by closing both ends of the unit cell 10, the electrode active material layer 22 can be sealed inside and used for the production of the assembled battery described above.

The separator 30 is arranged between the positive electrode 20a and the negative electrode 20b. In the assembled battery, the plurality of unit cells 10 are stacked with the positive electrode 20a and the negative electrode 20b directed in the same direction.

The separator 30 holds an electrolyte. Thereby, the separator 30 functions as an electrolyte layer. The separator 30 is arranged between the electrode active material layers 22 of the positive electrode 20a and the negative electrode 20b to prevent them from coming into contact with each other. Thereby, the separator 30 functions as a partition wall between the positive electrode 20a and the negative electrode 20b.

The electrolyte held in the separator 30 includes, for example, an electrolytic solution or a gel polymer electrolyte. High lithium ion conductivity is ensured by using these electrolytes. Examples of the form of the separator include porous sheet separators and non-woven fabric separators made of a polymer or fiber that absorbs and retains the electrolyte.

The positive electrode 20 a and the negative electrode 20 b each have a current collector 21 , an electrode active material layer 22 and a frame 35 . The electrode active material layer 22 and the current collector 21 are arranged in this order from the separator 30 side. The frame 35 is frame-shaped (annular). The frame 35 surrounds the electrode active material layer 22 . The frame 35 of the positive electrode 20a and the frame 35 of the negative electrode 20b are welded together and integrated. In the following description, when distinguishing between the electrode active material layers 22 of the positive electrode 20a and the negative electrode 20b, they are referred to as a positive electrode active material layer 22a and a negative electrode active material layer 22b, respectively.

<Specific example of positive electrode current collector>
As the positive electrode current collector that constitutes the positive electrode current collector layer 21a, a known current collector used in a lithium-ion single battery can be used. A resin current collector (such as the resin current collector described in JP-A-2012-150905 and WO 2015/005116) can be used. The positive electrode collector constituting the positive electrode collector layer 21a is preferably a resin collector from the viewpoint of battery characteristics and the like.

Metal current collectors include, for example, copper, aluminum, titanium, nickel, tantalum, niobium, hafnium, zirconium, zinc, tungsten, bismuth, antimony, alloys containing one or more of these metals, and the group consisting of stainless alloys. and one or more metal materials selected from These metal materials may be used in the form of thin plates, metal foils, or the like. Alternatively, a metal current collector formed by forming the above metal material on the surface of a base material other than the above metal material by sputtering, electrodeposition, coating, or the like may be used.

The resin current collector preferably contains a conductive filler and a matrix resin. Examples of the matrix resin include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP) and the like, but are not particularly limited. Also, the conductive filler is not particularly limited as long as it is selected from materials having conductivity. The conductive filler may be a conductive fiber having a fibrous shape.

The resin current collector may contain other components (dispersant, cross-linking accelerator, cross-linking agent, colorant, ultraviolet absorber, plasticizer, etc.) in addition to the matrix resin and the conductive filler. Also, a plurality of resin current collectors may be laminated and used, or a resin current collector and a metal foil may be laminated and used.

Although the thickness of the positive electrode current collector layer 21a is not particularly limited, it is preferably 5 to 150 μm. When a plurality of resin current collectors are laminated and used as the positive electrode current collector layer 21a, the total thickness after lamination is preferably 5 to 150 μm. The positive electrode current collector layer 21a can be obtained, for example, by molding a conductive resin composition obtained by melt-kneading a matrix resin, a conductive filler, and a dispersing agent for a filler used if necessary into a film by a known method. can be done.

<Specific example of positive electrode active material>
The positive electrode active material layer 22a is preferably a non-bound mixture containing a positive electrode active material. Here, the non-bound body means that the position of the positive electrode active material is not fixed in the positive electrode active material layer, and the positive electrode active materials and the positive electrode active material and the current collector are not irreversibly fixed. means When the positive electrode active material layer 22a is a non-bound body, the positive electrode active materials are not irreversibly fixed to each other. Even when stress is applied to the material layer 22a, the positive electrode active material moves, which is preferable because the destruction of the positive electrode active material layer 22a can be prevented. The positive electrode active material layer 22a, which is a non-binder, can be obtained by a method such as changing the positive electrode active material layer 22a into a positive electrode active material layer 22a containing a positive electrode active material and an electrolytic solution but not containing a binder. can. In this specification, the binder means an agent that cannot reversibly fix the positive electrode active materials together and the positive electrode active material and the current collector, and includes starch, polyvinylidene fluoride, polyvinyl alcohol, carboxyl Known solvent-drying type binders for lithium ion batteries such as methylcellulose, polyvinylpyrrolidone, tetrafluoroethylene, styrene-butadiene rubber, polyethylene and polypropylene can be used. These binders are used by dissolving or dispersing them in a solvent, and by volatilizing and distilling off the solvent, the surface solidifies without exhibiting stickiness. cannot be reversibly fixed.

Examples of the positive electrode active material include, but are not particularly limited to, a composite oxide of lithium and a transition metal, a composite oxide containing two transition metal elements, and a composite oxide containing three or more metal elements. .

The positive electrode active material may be a coated positive electrode active material in which at least part of the surface is coated with a coating material containing a polymer compound. When the positive electrode active material is covered with the coating material, the volume change of the positive electrode is moderated, and the expansion of the positive electrode can be suppressed.

As the polymer compound constituting the coating material, those described as active material coating resins in JP-A-2017-054703 and WO 2015/005117 can be preferably used.

The coating material may contain a conductive agent. As the conductive agent, the same conductive filler as contained in the positive electrode current collector layer 21a can be preferably used.

The positive electrode active material layer 22a may contain an adhesive resin. As the adhesive resin, for example, a non-aqueous secondary battery active material coating resin described in JP-A-2017-054703 is mixed with a small amount of an organic solvent to adjust its glass transition temperature to room temperature or lower. Also, those described as adhesives in JP-A-10-255805 can be preferably used. In addition, adhesive resin is a resin that does not solidify even if the solvent component is evaporated and dried, and has adhesiveness (the property of adhering by applying a slight pressure without using water, solvent, heat, etc.) means On the other hand, a solution-drying type electrode binder used as a binder is one that evaporates a solvent component to dry and solidify, thereby firmly adhering and fixing active materials to each other. Therefore, the binder (solution-drying type electrode binder) and the adhesive resin described above are different materials.

The positive electrode active material layer 22a may contain an electrolytic solution containing an electrolyte and a non-aqueous solvent. As the electrolyte, those used in known electrolytic solutions can be used. As the non-aqueous solvent, those used in known electrolytic solutions (eg, phosphate esters, nitrile compounds, mixtures thereof, etc.) can be used. For example, a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) or a mixture of ethylene carbonate (EC) and propylene carbonate (PC) can be used.

The positive electrode active material layer 22a may contain a conductive aid. As the conductive aid, a conductive material similar to the conductive filler contained in the positive electrode current collector layer 21a can be preferably used.

Although the thickness of the positive electrode active material layer 22a is not particularly limited, it is preferably 150 to 600 μm, more preferably 200 to 450 μm, from the viewpoint of battery performance.

In the embodiment, the positive electrode composition supplied to form the positive electrode active material layer 22a is a wet powder containing a positive electrode active material and a non-aqueous electrolyte. Moreover, it is more preferable that the wet powder is in a pendular state or a funicular state.

The ratio of the non-aqueous electrolyte in the wet powder is not particularly limited, but in the case of the positive electrode, the ratio of the non-aqueous electrolyte to the entire wet powder is 0.5 to 0.5 to make the pendular state or funicular state. 15% by weight is desirable.

<Specific example of negative electrode current collector>
As the negative electrode current collector constituting the negative electrode current collector layer 21b, the same one as the positive electrode current collector can be appropriately selected and used, and can be obtained by the same method. The negative electrode current collector layer 21b is preferably a resin current collector from the viewpoint of battery characteristics and the like. Although the thickness of the negative electrode current collector layer 21b is not particularly limited, it is preferably 5 to 150 μm.

<Specific example of negative electrode active material>
The negative electrode active material layer 22b is preferably a non-bonded mixture containing a negative electrode active material. The reason why the negative electrode active material layer is preferably a non-binder and the reason why the positive electrode active material layer 22a is preferably a non-binder is the method for obtaining the negative electrode active material layer 22b which is a non-binder. , and the method for obtaining the positive electrode active material layer 22a which is a non-binder.

As the negative electrode active material, for example, a carbon-based material, a silicon-based material, a mixture thereof, or the like can be used, but the material is not particularly limited.

The negative electrode active material may be a coated negative electrode active material in which at least part of the surface is coated with a coating material containing a polymer compound. When the periphery of the negative electrode active material is covered with the coating material, the volume change of the negative electrode is moderated, and the expansion of the negative electrode can be suppressed.

As the coating material, the same coating material as that constituting the coated positive electrode active material can be suitably used.

The negative electrode active material layer 22b contains an electrolytic solution containing an electrolyte and a non-aqueous solvent. As for the composition of the electrolytic solution, an electrolytic solution similar to the electrolytic solution contained in the positive electrode active material layer 22a can be suitably used.

The negative electrode active material layer 22b may contain a conductive aid. As the conductive aid, a conductive material similar to the conductive filler contained in the positive electrode active material layer 22a can be preferably used.

The negative electrode active material layer 22b may contain an adhesive resin. As the adhesive resin, the same adhesive resin as an optional component of the positive electrode active material layer 22a can be preferably used.

Although the thickness of the negative electrode active material layer 22b is not particularly limited, it is preferably 150 to 600 μm, more preferably 200 to 450 μm, from the viewpoint of battery performance.

In the embodiment, the negative electrode composition supplied to form the negative electrode active material layer 22b is wet powder containing a negative electrode active material and a non-aqueous electrolyte. Moreover, it is more preferable that the wet powder is in a pendular state or a funicular state.

The proportion of the non-aqueous electrolyte in the wet powder is not particularly limited, but in the case of the negative electrode, the proportion of the non-aqueous electrolyte in the entire wet powder is 0.5 to 0.5 to make the pendular state or funicular state. 25% by weight is desirable.

<Specific example of separator>
Examples of the electrolyte held in the separator 30 include an electrolytic solution and a gel polymer electrolyte. By using these electrolytes, the separator 30 ensures high lithium ion conductivity. Examples of the form of the separator 30 include, but are not particularly limited to, polyethylene or polypropylene porous films.

<Specific example of frame>
The material for the frame 35 is not particularly limited as long as it is a material that is durable against the electrolytic solution. For example, a polymer material is preferable, and a thermosetting polymer material is more preferable. As a material for forming the frame 35, any material having insulating properties, sealing properties (liquid-tightness), heat resistance under the battery operating temperature, and the like may be used, and a resin material is preferably employed. More specifically, examples of the frame 35 include epoxy-based resins, polyolefin-based resins, polyurethane-based resins, and polyvinylidene fluoride resins. preferable.

<Manufacturing apparatus and method for manufacturing battery electrode>
Next, a battery electrode manufacturing apparatus and a battery electrode manufacturing method (hereinafter abbreviated as a manufacturing method) of the present embodiment will be described. For example, in the battery electrode manufacturing apparatus and the battery electrode manufacturing method, the positive electrode 20a and the negative electrode 20b are first manufactured. The method of manufacturing the positive electrode 20 a and the method of manufacturing the negative electrode 20 b mainly differ in the electrode active material contained in the electrode active material layer 22 . Here, as a method for manufacturing the electrode 20, a method for manufacturing the positive electrode 20a and the negative electrode 20b will be collectively described.

FIG. 2 is a schematic diagram of the battery electrode manufacturing apparatus 1000. As shown in FIG. For example, the battery electrode manufacturing apparatus 1000 includes a chamber 100 , a rotating mask 200 , an electrode composition feeder 300 , a compression device 400 and a frame feeder 500 . The rotating mask 200 is an example of a rotating mask. The electrode composition supply device 300 is an example of a supply unit. As an example, a case where the strip-shaped base film is the strip-shaped current collector 21B will be described below.

The chamber 100 is a room whose interior can be kept under a pressure lower than the atmospheric pressure. The pressure inside the chamber 100 is reduced below atmospheric pressure by a decompression pump (not shown). The standard atmospheric pressure is approximately 1013 hPa (approximately 10 ⁵ Pa).

For example, a current collector roll 21R is arranged outside the chamber 100, and a strip-shaped current collector 21B pulled out from the current collector roll 21R is transported into the chamber 100 through a slit. Hereinafter, the strip-shaped current collector 21B may be referred to as the current collector 21B. The current collector 21B is the current collector 21 before being cut into a predetermined shape. The current collector 21B is transported along the transport direction D at a predetermined speed. Hereinafter, the direction in which the current collector 21B is conveyed will be described as the downstream side D1, and the opposite direction as the upstream side D2. The external space of the chamber 100 in which the current collector roll 21R is arranged may be at normal pressure, or may be decompressed by a chamber different from the chamber 100 .

The rotating mask 200 is configured in a ring shape by connecting a plurality of hollow masks. For example, as shown in FIG. 3, the rotating mask 200 is configured by connecting a mask 201a, a mask 201b, and a mask 201c. In the following description, the masks 201a to 201c are simply referred to as the mask 201 when they are not distinguished from each other.

The electrode composition supply device 300 supplies the electrode composition 22c onto the current collector 21B in the chamber 100. As shown in FIG. As described above, in the embodiment, the electrode composition 22c (positive electrode composition A material, a negative electrode composition) is a wet powder containing an electrode active material (positive electrode active material, negative electrode active material) and an electrolytic solution (non-aqueous electrolytic solution). Moreover, in the embodiment, it is more preferable that the wet powder as the electrode composition 22c is in a pendular state or a funicular state. Moreover, the electrode active material is a coated electrode active material coated with a coating material containing a polymer compound. Therefore, it is necessary to keep the electrode composition 22c in a soft state in the supply step.

Specifically, the electrode composition supply device 300 includes a hopper 301 that holds the electrode composition 22c therein. The electrode composition supply device 300 supplies the electrode composition 22c from the opening of the hopper 301 onto the current collector 21B and to the position in the inner space of the mask 201 .

The supply of the electrode composition 22c will be described with reference to FIG. As indicated by the arrow in FIG. 4, the rotating mask 200 rotates in a direction in which the moving direction of the surface in contact with the current collector 21B coincides with the conveying direction (downstream side D1) of the current collector 21B. That is, in FIG. 4, the rotating mask 200 rotates counterclockwise. As a result, the masks 201a to 201c sequentially come into contact with the current collector 21B.

The hopper 301 provided in the electrode composition supply device 300 is arranged inside the ring-shaped rotating mask 200, and among the masks 201a to 201c, the position of the inner space of the mask 201 that is in contact with the current collector 21B. to supply the electrode composition 22c. The mask 201, for which the supply of the electrode composition 22c to the internal space has been completed, is separated from the current collector 21B by the rotation of the rotating mask 200. FIG. That is, by rotating the rotating mask 200, the mask 201 is continuously supplied to and recovered from the current collector 21B.

For example, a shutter (not shown) is provided at the position of the opening of the hopper 301, and the shutter controls the supply and stop of the electrode composition 22c by opening and closing the opening of the hopper 301. An electrode composition 22c can be provided.

Alternatively, the electrode composition supply device 300 may supply the electrode composition 22c by opening and closing the opening of the hopper 301 by connecting the masks 201 to each other. In other words, while the rotating mask 200 is rotating, the inner space of the mask 201 and the connecting portion between the masks 201 alternately pass through the opening of the hopper 301 . Here, when the inner space of the mask 201 is positioned at the opening of the hopper 301, the opening of the hopper 301 is opened and the electrode composition 22c is supplied. On the other hand, when the connecting portion between the masks 201 is positioned at the opening of the hopper 301, the opening of the hopper 301 is closed and the supply of the electrode composition 22c is stopped.

The rotating mask 200 may further comprise rollers 202, as shown in FIG. The roller 202 compresses the electrode composition 22c supplied onto the current collector 21B. For example, the roller 202 lightly compresses the electrode composition 22c prior to compression by the compression device 400, thereby smoothing the surface of the electrode composition 22c and suppressing scattering of the electrode composition 22c.

FIG. 5 shows a perspective view of the rotating mask 200 and the electrode composition supply device 300. As shown in FIG. As shown in FIG. 5, the rotating mask 200 is rotatably held by a guide 203 that abuts against the annular rotating mask 200 from the inside.

Guide 203 may operate as a drive mechanism to rotate rotating mask 200 . That is, by rotating the guide 203 by a motor or the like, power can be transmitted to the rotating mask 200 to rotate it. Alternatively, a drive mechanism (not shown in FIG. 5) may be further provided and the drive mechanism may rotate the rotating mask 200 . For example, a ring-shaped member that abuts on the ring-shaped rotating mask 200 from the outside or side surface may be provided, and the ring-shaped member may be rotated by a motor or the like to drive the rotating mask 200 .

As shown in FIG. 5, the electrode composition supply device 300 may further include a screw conveyor 302 . The screw conveyor 302 conveys the electrode composition 22 c and supplies it to the inside of the hopper 301 .

As shown in FIG. 6, a cover 204 covering the rotating mask 200 and the hopper 301 and an exhaust pipe 205 for exhausting the inside of the cover 204 may be further provided. FIG. 6 is a perspective view showing the rotating mask 200 and the electrode composition supply device 300 from the same angle as FIG. By providing the cover 204 , scattering of the electrode composition 22 c can be suppressed when the electrode composition 22 c is supplied from the hopper 301 or when the electrode composition 22 c is compressed by the rollers 202 .

Returning to FIG. 2, the description continues. The compression device 400 compresses the electrode composition 22c supplied onto the current collector 21B to form the electrode active material layer 22 shown in FIGS. 1A and 1B. Specifically, the compression device 400 sandwiches and compresses the current collector 21B and the electrode composition 22c.

Although FIG. 2 shows only a pair of rollers as the compression device 400, embodiments are not limited to this. For example, the battery electrode manufacturing apparatus 1000 may include a plurality of pairs of rollers as the compressing device 400 to compress the electrode composition 22c step by step. Alternatively, the electrode composition 22c may be compressed while a release film is interposed between the roller and the electrode composition 22c. Thereby, it is possible to prevent a part of the electrode composition 22c from adhering to the roller, and to make the surface of the electrode composition 22c smoother. Alternatively, the electrode composition 22c may be compressed with the separator 30 sandwiched between the roller and the electrode composition 22c. As a result, the surface of the electrode composition 22c can be made smoother, and the step of supplying the separator 30 to the positive electrode 20a or the negative electrode 20b can be omitted.

The frame supply device 500 supplies the frame 35 to the conveyed current collector 21B. For example, the frame supply device 500 has a robot arm and places the pre-manufactured frame 35 at a predetermined position on the conveyed current collector 21B. Alternatively, the frame 35 may be manufactured on the current collector 21B. As an example, the current collector 21B is used as a base material, and a predetermined material is discharged or applied in a predetermined shape onto the current collector 21B using a dispenser, a coater, or the like, thereby forming the frame 35 on the current collector 21B. can be formed.

After the frame supply device 500 supplies the frame 35, the compression device 400 may compress the electrode composition 22c. Also, the roller 202 shown in FIGS. 4 and 5 may function as the compression device 400 . That is, the rollers 202 may sandwich and compress the current collector 21B and the electrode composition 22c to form the electrode active material layer 22 shown in FIGS. 1A and 1B.

As described above, the rotating mask 200 is configured in a ring shape by connecting a plurality of hollow masks 201 . The electrode composition supply device 300 supplies the electrode composition 22c from the opening of the hopper 301 that holds the electrode composition 22c to the position on the current collector 21B and the internal space of the mask 201 . The rotating mask 200 rotates in a direction in which the moving direction of the surface that contacts the current collector 21B coincides with the transport direction of the current collector 21B, so that the plurality of masks 201 sequentially contact the current collector 21B. configured as The electrode composition supply device 300 supplies the electrode composition 22c to the position of the internal space of the mask 201, which is in contact with the current collector 21B, among the plurality of masks 201 included in the rotating mask 200. . Thereby, the battery electrode manufacturing apparatus 1000 of the embodiment can precisely supply the electrode composition 22c onto the current collector 21B. Furthermore, as shown in FIGS. 3 to 6, the rotating mask 200 is compact, and the supply and recovery of the mask onto the current collector 21B can be realized with a simple configuration. Manufacture and maintenance of the rotating mask 200 are also easy, and the manufacturing cost can be reduced.

In addition, in the embodiment, each step of supplying the electrode composition 22c by the electrode composition supply device 300 and compressing the electrode composition 22c by the compression device 400 is performed in the chamber 100 whose inside is reduced in pressure below atmospheric pressure. do. As a result, air can be prevented from remaining inside the electrode composition 22c, and the uniformity of the electrode active material layer 22 can be improved.

Here, the rotating mask 200 has a simple configuration and a compact size. Accordingly, there is no need to increase the size of the chamber 100 in order to store the rotating mask 200 therein, which also reduces manufacturing costs.

In the above-described embodiment, the strip-shaped base film on which the electrode composition 22c is placed is described as the strip-shaped current collector 21B, but the present invention is not limited to this. For example, instead of the strip-shaped current collector 21B shown in FIG. 2, a strip-shaped separator sheet or a strip-shaped release film may be used as the base film. The strip-shaped separator sheet can be trimmed later to form the separator 30 shown in FIGS. 1A and 1B.

For example, when the separator sheet is used as the base film, the electrode composition 22c is supplied on the separator sheet, the current collector 21B is supplied to the surface of the electrode composition 22c opposite to the separator sheet, and the separator sheet and By trimming the current collector 21B into a predetermined shape, the positive electrode 20a or the negative electrode 20b can be produced.

Further, when the release film is used as the base film, the electrode composition 22c is supplied on the release film, the current collector 21B is supplied to the surface of the electrode composition 22c opposite to the release film, and the release film is After the film is collected, a separator sheet is supplied to the surface opposite to the current collector 21B, and the current collector 21B and the separator sheet are trimmed into a predetermined shape to produce the positive electrode 20a or the negative electrode 20b. can be done. Instead of supplying a separator sheet and then trimming, the separator 30 may be supplied to the electrode composition 22c.

Alternatively, the electrode composition 22c is supplied on the release film, the separator sheet is supplied to the surface of the electrode composition 22c opposite to the release film, the release film is recovered, and then the surface opposite to the separator sheet The positive electrode 20a or the negative electrode 20b can be produced by supplying the current collector 21B to the separator sheet and trimming the separator sheet and the current collector 21B into a predetermined shape. Instead of supplying the current collector 21B and then trimming it, the current collector 21 trimmed into a predetermined shape may be supplied to the electrode composition 22c.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment. is also included. Furthermore, it goes without saying that the configurations shown in the respective embodiments can be used in combination as appropriate.

10: Single cell 20: Electrode 20a: Positive electrode 20b: Negative electrode 21: Current collector 21a: Positive electrode current collector layer 21b: Negative electrode current collector layer 21B: Strip-shaped current collector 21R: Current collector roll 22: Electrode active material Layer 22a: Positive electrode active material layer 22b: Negative electrode active material layer 22c: Electrode composition 30: Separator 35: Frame 100: Chamber 200: Rotating mask 201a: Mask 201b: Mask 201c: Mask 202: Roller 203: Guide 204: Cover 205: Exhaust pipe 300: Electrode composition supply device 301: Hopper 302: Screw conveyor 400: Compression device 500: Frame supply device 1000: Battery electrode manufacturing device D: Conveying direction D1: Downstream side D2: Upstream side

Claims (5)

a rotating mask configured in a ring shape by connecting a plurality of hollow masks;
a supply unit that supplies the electrode composition from an opening of a hopper that holds the electrode composition inside to a position on the base film and in the internal space of the mask;
The rotating mask rotates in a direction in which the direction of movement of the surface in contact with the base film coincides with the transport direction of the base film, so that the plurality of masks sequentially contact the base film. configured as
The supply unit supplies the electrode composition to a position of an internal space of one of the plurality of masks included in the rotating mask that is in contact with the base film. Device. a cover that covers the rotating mask and the hopper;
an exhaust unit for exhausting the inside of the cover;
The battery electrode manufacturing apparatus according to claim 1, further comprising: 3. The battery electrode manufacturing apparatus according to claim 1, wherein said rotating mask further comprises a compressing part for compressing said electrode composition supplied onto said base film. The battery according to any one of claims 1 to 3, wherein the supply unit supplies the electrode composition by opening and closing the opening of the hopper by a connection portion between the masks in the rotating mask. Electrode manufacturing equipment. A method for producing a battery electrode, comprising supplying the electrode composition to a position of the inner space of a hollow mask on a base film from an opening of a hopper that holds the electrode composition inside,
A plurality of the masks are rotated by rotating a rotating mask formed in a ring shape by connecting a plurality of the masks in a direction in which the moving direction of the surface in contact with the base film coincides with the conveying direction of the base film. successively brought into contact with the base film,
A method for manufacturing a battery electrode, wherein the electrode composition is supplied to a position of an internal space of a mask that is in contact with the base film, among the plurality of masks included in the rotating mask.

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