Electrode manufacturing device for secondary battery cell, electrode manufacturing method for secondary battery cell, and secondary battery cell

Abstract

To provide an electrode manufacturing device for secondary battery cells, which manufactures an electrode capable of suppressing a decrease in ionic conductive properties while suppressing occurrence of unevenness in an active material layer (electrode composition layer) after rolling.SOLUTION: An electrode manufacturing device for secondary battery cells includes: a separator supply section supplying a strip-shaped separator by superposing the separator onto a first electrode composition conveyed in a longitudinal direction of a strip-shaped first electrode current collector, while conveying the separator in a longitudinal direction; a mesh supply section supplying a strip-shaped mesh by superposing the mesh onto a second electrode composition conveyed in a longitudinal direction of a strip-shaped second electrode current collector, while conveying the mesh in the longitudinal direction; a first rolling section in which a first rolling roller rolls the first electrode composition via the separator in a state where the first rolling roller abuts on a surface of the separator; and a second rolling section in which a second rolling roller rolls the second electrode composition via the mesh in a state where the second rolling roller abuts on a surface of the mesh.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apparatus for manufacturing an electrode for a secondary battery cell, a method for manufacturing an electrode for a secondary battery cell, and a secondary battery cell. [Background technology]

[0002] Secondary batteries such as lithium-ion secondary batteries that can be repeatedly charged and discharged are widely used in various technical fields such as smartphones, personal computers, electric vehicles, hybrid vehicles, stationary power storage applications, etc. For example, a lithium-ion secondary battery has a battery cell in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween.

[0003] A battery electrode manufacturing device has been disclosed that supplies active material laminated on a strip-shaped current collector for each of the positive and negative electrode sides of such a secondary battery with a strip-shaped separator sheet superimposed thereon, and rolls the active material through the separator sheet to obtain a battery electrode (see, for example, Patent Document 1). This battery electrode manufacturing device presses a roller against the active material layer through the separator sheet for each of the positive and negative electrode sides to roll it, thereby suppressing the occurrence of unevenness in the active material layer after rolling.

[0004] However, when a battery cell (battery cell A) is formed using electrodes (positive and negative electrodes) manufactured by the battery electrode manufacturing apparatus disclosed in Patent Document 1, battery cell A has two separators stacked between the electrodes. Ions moving between the electrodes of battery cell A must pass through the two separators. Therefore, when comparing battery cell A with battery cell B which has one separator (the only difference is the number of separator layers), there is a risk that the ionic conductivity of battery cell A will be lower than that of battery cell B. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-3092 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the problems of the conventional techniques as described above. That is, an object of the present invention is to provide an electrode manufacturing apparatus for a secondary battery cell, an electrode manufacturing method for a secondary battery cell, and a secondary battery cell, which manufacture an electrode capable of suppressing the decrease in ion conductive properties while suppressing the occurrence of unevenness in an active material layer (electrode composition layer) after rolling. [Means for solving the problem]

[0007] In order to achieve the above object, the invention described in claim 1 is characterized by comprising: a separator supplying unit that supplies a separator, wherein a first electrode composition is placed on a strip-shaped first electrode collector, and a separator is supplied by transporting a strip-shaped separator in the longitudinal direction and overlapping the first electrode composition transported in the longitudinal direction of the first electrode collector; a mesh supplying unit that supplies a mesh, wherein a second electrode composition is placed on a strip-shaped second electrode collector, and a mesh is supplied by transporting a strip-shaped mesh in the longitudinal direction and overlapping the second electrode composition transported in the longitudinal direction of the second electrode collector; a first rolling unit that includes a first rolling roller and rolls the first electrode composition through the separator with the first rolling roller in contact with a surface of the separator; and a second rolling unit that includes a second rolling roller and rolls the second electrode composition through the mesh with the second rolling roller in contact with a surface of the mesh. In the invention according to claim 2, the separator supply section and / or the mesh supply section further includes a tension roller disposed before the rolling roller in the conveying direction. The invention described in claim 3 is characterized in that the separator supplying section further includes a first discharge section which discharges an electrolyte solution between a surface of the first electrode composition and a back surface of the separator before the separator is overlaid on the first electrode composition, and / or a second discharge section which discharges an electrolyte solution between a surface of the second electrode composition and a back surface of the mesh before the mesh is overlaid on the second electrode composition, in the mesh supplying section. The invention described in claim 4 is characterized by comprising a first preparation step of preparing a first electrode having a first electrode composition layer on a strip-shaped first electrode collector, a second preparation step of preparing a second electrode having a second electrode composition layer on a strip-shaped second electrode collector, a first rolling step of placing a separator on the first electrode composition layer, contacting a rolling roller with the surface of the separator, and rolling the first electrode composition layer through the separator, and a second rolling step of placing a mesh on the second electrode composition layer, contacting a rolling roller with the surface of the mesh, and rolling the second electrode composition layer through the mesh. The invention described in claim 5 is characterized by comprising, in order, a first electrode collector, a first electrode composition layer, a separator, a mesh, a second electrode composition layer, and a second electrode collector. Effect of the Invention

[0008] According to the electrode manufacturing apparatus for a secondary battery cell of the present invention, it is possible to manufacture an electrode that can suppress the reduction in the conductive properties of ions moving between the electrodes while suppressing the occurrence of unevenness in the first electrode composition and the second electrode composition (electrode composition layer) during rolling. [Brief description of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view illustrating a schematic diagram of a secondary battery cell manufactured by a secondary battery cell manufacturing apparatus according to an embodiment of the present invention. [Diagram 2] 1 is a schematic cross-sectional view showing a manufacturing apparatus for a secondary battery cell according to an embodiment of the present invention. [Diagram 3]FIG. 1 is a schematic perspective view showing an example of a positive electrode manufacturing process by a positive electrode manufacturing apparatus 100 among the manufacturing apparatuses for a secondary battery cell according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic perspective view showing an example of a negative electrode manufacturing process by a negative electrode manufacturing apparatus 200 among the manufacturing apparatuses for a secondary battery cell according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic perspective view showing a modified example of a positive electrode manufacturing apparatus 100 among the manufacturing apparatuses for a secondary battery cell according to an embodiment of the present invention, and a modified example of a positive electrode manufacturing process by the positive electrode manufacturing apparatus 100. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In this specification, "and / or" means at least one of the two. For example, "X and / or Y" means X only, Y only, or both X and Y.

[0011] Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. In addition, the same reference numerals are used for similar members in the drawings. Furthermore, the dimensional ratios in the drawings may be exaggerated for convenience of explanation and may differ from the actual ratios. Furthermore, hereinafter, a plan view indicates that an object is viewed from the stacking direction of the battery cells. A cross-sectional view indicates that a cross section obtained by cutting the battery cells in the stacking direction is viewed from a direction perpendicular to the cross section. Furthermore, in this specification, a peripheral portion indicates a region having a predetermined width extending inward from the periphery of an object such as a current collector, a composition layer, and a separator.

[0012] <Present embodiment> <Secondary battery> First, a secondary battery will be described. The secondary battery is, for example, a battery pack formed by combining a plurality of secondary battery cells (hereinafter also simply referred to as battery cells) using electrodes manufactured by the secondary battery cell electrode manufacturing apparatus according to this embodiment into a modularized battery. The secondary battery is, for example, a lithium ion secondary battery. Below, an example in which the secondary battery cell is configured as a lithium ion secondary battery cell will be described.

[0013] <Secondary battery cell> Next, a secondary battery cell using an electrode manufactured by the secondary battery cell electrode manufacturing apparatus according to this embodiment will be described. FIG. 1 is a cross-sectional view that shows a schematic diagram of a secondary battery cell (battery cell 5) manufactured by the secondary battery cell manufacturing apparatus according to this embodiment. As shown in FIG. 1, the battery cell 5 has a rectangular parallelepiped shape as a whole, and includes a positive electrode 1, a negative electrode 2, a separator 30, and a mesh 40. The positive electrode 1 includes a positive electrode current collector 10 and a positive electrode composition layer 11 arranged on the positive electrode current collector 10 (the upper surface (surface) of the positive electrode current collector 10 in FIG. 1). The negative electrode 2 includes a negative electrode current collector 20 and a negative electrode composition layer 21 arranged on the negative electrode current collector 20 (the lower surface (surface) of the negative electrode current collector 20 in FIG. 1). The battery cell 5 is arranged so that the positive electrode composition layer 11 and the negative electrode composition layer 21 face each other with the separator 30 and mesh 40 interposed therebetween, and the positive electrode 1, mesh 40, separator 30, and negative electrode 2 are laminated in this order.

[0014] The positive electrode current collector 10 is rectangular in plan view and is a resin current collector (resin current collector). The positive electrode current collector 10 contains a resin and a conductive filler, and may further contain a dispersant for the resin current collector. The surface of the positive electrode current collector 10 may be metal-plated. An example of the resin material is polypropylene (PP). The peripheral portion of the positive electrode current collector 10 protrudes relative to the peripheral portion of the positive electrode composition layer 11 in cross-sectional view. The positive electrode current collector 10 has a first surface (front surface) on the side of the positive electrode composition layer 11 and a second surface (back surface) opposite to the first surface.

[0015] The negative electrode current collector 20 is rectangular in plan view and is a resin current collector (resin current collector). The negative electrode current collector 20 contains a resin and a conductive filler, and may further contain a dispersant for the resin current collector. The surface of the negative electrode current collector 20 may be metal-plated. Examples of the resin material include polypropylene (PP). The peripheral portion of the negative electrode current collector 20 protrudes relative to the peripheral portion of the negative electrode composition layer 21 in cross-sectional view. The negative electrode current collector 20 has a first surface (front surface) on the negative electrode composition layer 21 side and a second surface (back surface) opposite to the first surface. Hereinafter, the positive electrode current collector 10 and the negative electrode current collector 20 are also simply referred to as electrode current collectors.

[0016] The positive electrode composition layer 11 has a rectangular shape in a plan view and contains a positive electrode active material. Examples of the positive electrode active material include a composite oxide of lithium and a transition metal. The positive electrode composition layer 11 can contain a coating resin, a conductive assistant such as metal or carbon, an electrolyte solution containing an electrolyte salt, and the like, in addition to the positive electrode active material. The positive electrode active material may be coated with a coating material containing a coating resin and a conductive assistant. In addition, the positive electrode composition layer 11 may or may not contain conductive fibers such as carbon fibers.

[0017] The negative electrode composition layer 21 is rectangular in plan view and contains a negative electrode active material. Examples of the negative electrode active material include hard carbon. The negative electrode composition layer 21 can contain a coating resin, a conductive assistant such as metal or carbon, an electrolyte solution containing an electrolyte salt, and the like, in addition to the negative electrode active material. The negative electrode active material may be coated with a coating material containing a coating resin and a conductive assistant. The negative electrode composition layer 21 may or may not contain conductive fibers such as carbon fibers. Hereinafter, the positive electrode composition layer 11 and the negative electrode composition layer 21 are also simply referred to as electrode composition layers.

[0018] The separator 30 has a rectangular shape in a plan view, and may be, for example, a porous sheet made of a polymer or fiber that absorbs and retains an electrolytic solution or a gel polymer electrolyte. A nonwoven fabric separator may also be used. The size of the separator 30 is larger than the size of the negative electrode composition layer 21 in a plan view. The peripheral portion of the separator 30 protrudes beyond the peripheral portion of the negative electrode composition layer 21 in a cross-sectional view. The separator 30 has a first surface (front surface) that faces the positive electrode composition layer 11, and a second surface (back surface) that faces the negative electrode composition layer 21.

[0019] The mesh 40 has a rectangular shape in a plan view, and may be, for example, a net-like material that absorbs and holds an electrolytic solution or a gel polymer electrolyte. The mesh 40 has higher ionic conductivity than the separator 30. The size of the mesh 40 is larger than the size of the positive electrode composition layer 11 in a plan view. The peripheral portion of the mesh 40 protrudes beyond the peripheral portion of the positive electrode composition layer 11 in a cross-sectional view. The mesh 40 has a first surface (front surface) that faces the negative electrode composition layer 21, and a second surface (back surface) that faces the positive electrode composition layer 11.

[0020] The materials of the components constituting the battery cell 5 are not limited to the above-mentioned materials, and various materials can be used.

[0021] <Secondary battery cell manufacturing equipment> Next, an example of a manufacturing apparatus for a secondary battery cell according to this embodiment will be described with reference to FIG.

[0022] 2 is a schematic cross-sectional view showing a secondary battery cell manufacturing apparatus according to the present embodiment. As shown in FIG. 2, for example, a secondary battery cell manufacturing apparatus 1000 includes a positive electrode manufacturing apparatus 100, a negative electrode manufacturing apparatus 200, a lamination apparatus 300, and a packaging apparatus 400.

[0023] The positive electrode manufacturing apparatus 100 includes a positive electrode composition supplying section 120, a mesh supplying section 130, and a rolling section 140 on the positive electrode side. The positive electrode manufacturing apparatus 100 also includes a positive electrode current collector roll 110, a positive electrode current collector sheet 111 drawn from the positive electrode current collector roll 110, a positive electrode composition 121 supplied from the positive electrode composition supplying section 120 onto the positive electrode current collector sheet 111, a mesh roll 131, and a mesh sheet 133 drawn from the mesh roll 131. The positive electrode manufacturing apparatus 100 also includes a tension roller 132 that adjusts the tension of the mesh sheet 133. The positive electrode composition supplying section 120 includes a hopper that holds the positive electrode composition 121 therein and a shutter that opens and closes the opening of the hopper, although not shown. The mesh supplying section 130 includes a drive mechanism that draws out the mesh sheet 133 from the mesh roll 131, although not shown. The rolling section 140 on the positive electrode side includes a rolling roller on the positive electrode side.

[0024] The negative electrode manufacturing apparatus 200 includes a negative electrode composition supplying section 220, a separator supplying section 230, and a rolling section 240 on the negative electrode side. The negative electrode manufacturing apparatus 200 also includes a negative electrode current collector roll 210, a negative electrode current collector sheet 211 drawn from the negative electrode current collector roll 210, a negative electrode composition 221 supplied from the negative electrode composition supplying section 220 onto the negative electrode current collector sheet 211, a separator roll 231, and a separator sheet 233 drawn from the separator roll 231. The negative electrode manufacturing apparatus 200 also includes a tension roller 232 that adjusts the tension of the separator sheet 233. The negative electrode composition supplying section 220 includes a hopper that holds the negative electrode composition 221 therein and a shutter that opens and closes the opening of the hopper, although not shown. Although not shown, the separator supply unit 230 includes a drive mechanism that pulls out the separator sheet 233 from the separator roll 231. The negative electrode side rolling unit 240 includes a negative electrode side rolling roller.

[0025] The lamination device 300 has a function of laminating (bonding) a positive electrode workpiece made of a positive electrode 1 and a mesh 40 manufactured by the positive electrode manufacturing equipment 100 and a negative electrode workpiece made of a negative electrode 2 and a separator 30 manufactured by the negative electrode manufacturing equipment 200 facing each other to form a battery cell 5. The packaging device 400 has a function of packaging the battery cell 5 in an exterior body (not shown).

[0026] <Manufacturing method of secondary battery cells> Next, an example of a method for manufacturing a secondary battery cell according to this embodiment will be described with reference to Fig. 2. This embodiment includes a positive electrode manufacturing process, a negative electrode manufacturing process, a stacking process, and a packaging process. Each process will be described in order.

[0027] <Positive electrode manufacturing process> An example of a positive electrode manufacturing process will be described with reference to Fig. 2 and Fig. 3. Fig. 2 is a schematic cross-sectional view showing an example of a positive electrode manufacturing process by a positive electrode manufacturing apparatus 100 among the manufacturing apparatuses for a secondary battery cell according to this embodiment. Fig. 3 is a schematic perspective view showing the example of the positive electrode manufacturing process.

[0028] In the positive electrode manufacturing process, the positive electrode manufacturing apparatus 100 continuously delivers a strip-shaped positive electrode current collector sheet 111 drawn out from a positive electrode current collector roll 110 in one direction (transport direction D1) at a predetermined speed. Thereafter, the positive electrode composition supply unit 120 supplies the strip-shaped positive electrode composition 121 so that the positive electrode composition 121 is continuously placed on the positive electrode current collector sheet 111. As the strip-shaped positive electrode current collector sheet 111 is delivered, the strip-shaped positive electrode composition 121 is transported.

[0029] Thereafter, the mesh supply unit 130 supplies the belt-shaped mesh sheet 133 drawn from the mesh roll 131 by conveying it in the conveying direction D1 via the tension roller 132. Thereafter, the rolling roller on the positive electrode side of the rolling unit 140 on the positive electrode side presses and overlaps the mesh sheet 133 against the positive electrode composition 121 on the positive electrode current collector sheet 111 conveyed at a predetermined speed along the conveying direction D1 while conveying the mesh sheet 133 at the same predetermined speed, and rolls the positive electrode composition 121 through the surface of the mesh sheet 133. After passing through the rolling unit 140 on the positive electrode side, the mesh sheet 133 and the positive electrode composition 121 are bonded to form a layer 122 (electrode with mesh). By pressing the rolling roller through the mesh sheet 133, it is possible to prevent the positive electrode composition 121 from adhering to the rolling roller and causing rolling unevenness in the positive electrode composition 121. By this positive electrode manufacturing process, a positive electrode work-in-progress consisting of the positive electrode 1 and the mesh 40 of the battery cell 5 shown in FIG. 1 is manufactured.

[0030] The mesh supply unit 130 includes a tension roller 132 disposed before the rolling roller of the rolling unit 140 on the positive electrode side in the conveying direction. The mesh supply unit 130 conveys the mesh sheet 133 via the tension roller 132 to supply the mesh 40. The tension roller 132 may be one as shown in FIG. 2, or may be multiple as shown in FIG. 3. When the mesh sheet 133 is conveyed, it is preferable to appropriately adjust the tension so that the mesh sheet 133 does not wrinkle (the mesh sheet 133 does not wrinkle). The number of tension rollers 132 is appropriately selected.

[0031] <Negative electrode manufacturing process> An example of a negative electrode manufacturing process will be described with reference to Fig. 2 and Fig. 4. Fig. 2 is also a schematic cross-sectional view that shows an example of a negative electrode manufacturing process by a negative electrode manufacturing apparatus 200 out of the manufacturing apparatuses for a secondary battery cell according to this embodiment. Fig. 4 is a schematic perspective view that shows an example of the negative electrode manufacturing process.

[0032] In the negative electrode manufacturing process, the negative electrode manufacturing apparatus 200 continuously delivers the strip-shaped negative electrode current collector sheet 211 drawn out from the negative electrode current collector roll 210 in one direction (transport direction D1) at a predetermined speed. Thereafter, the negative electrode composition supply unit 220 supplies the strip-shaped negative electrode composition 221 so that the negative electrode composition 221 is continuously placed on the negative electrode current collector sheet 211. As the strip-shaped negative electrode current collector sheet 211 is delivered, the strip-shaped negative electrode composition 221 is transported.

[0033] Thereafter, the separator supplying section 230 supplies the strip-shaped separator sheet 233 drawn from the separator roll 231 by conveying it in the conveying direction D1 via the tension roller 232. Thereafter, the negative electrode side rolling roller of the negative electrode side rolling section 240 presses and overlaps the separator sheet 233 against the negative electrode composition 221 on the negative electrode current collector sheet 211 conveyed at a predetermined speed along the conveying direction D1 while conveying the separator sheet 233 at the same predetermined speed, and rolls the negative electrode composition 221 via the surface of the separator sheet 233. After passing through the negative electrode side rolling section 240, the separator sheet 233 and the negative electrode composition 221 are bonded to form a layer 222 (electrode with separator). By pressing the rolling roller via the separator sheet 233, it is possible to suppress the negative electrode composition 221 from adhering to the rolling roller and causing rolling unevenness in the negative electrode composition 221. This negative electrode manufacturing process produces a negative electrode work-in-progress consisting of the negative electrode 2 and the separator 30 of the battery cell 5 shown in FIG.

[0034] The separator supplying section 230 includes a tension roller 232 disposed before the negative electrode rolling roller of the negative electrode rolling section 240 in the conveying direction. The separator supplying section 230 conveys the separator sheet 233 via the tension roller 232 to supply the separator 30. The tension roller 232 may be one as shown in FIG. 2, or may be multiple as shown in FIG. 4. When the separator sheet 233 is conveyed, it is preferable to appropriately adjust the tension so that the separator sheet 233 does not wrinkle (the separator sheet 233 does not wrinkle). The number of tension rollers 232 is appropriately selected.

[0035] <Lamination process, packaging process> An example of the lamination process will be described. The lamination process is a process carried out after the positive electrode manufacturing process and the negative electrode manufacturing process are carried out. The secondary battery cell manufacturing apparatus 1000 conveys a positive electrode work-in-progress consisting of a positive electrode 1 and a mesh 40 manufactured by the positive electrode manufacturing apparatus 100, and a negative electrode work-in-progress consisting of a negative electrode 2 and a separator 30 manufactured by the negative electrode manufacturing apparatus 200, to the lamination device 300. In the lamination process, the lamination device 300 laminates (sticks) the positive electrode work-in-progress and the negative electrode work-in-progress. Specifically, the lamination device 300 rotates the negative electrode 2 (negative electrode work-in-progress) on which the separator 30 is placed 180 degrees so as to be upside down with respect to the positive electrode 1 (positive electrode work-in-progress) on which the mesh 40 is placed, and sticks them facing each other to form a battery cell 5. Also, the positive electrode 1 on which the mesh 40 is placed may be rotated 180 degrees so as to be upside down, and then bonded to the negative electrode 2 on which the separator 30 is placed.

[0036] An example of the packaging process will be described. The packaging process is a process carried out after the lamination process. The manufacturing apparatus 1000 for secondary battery cells conveys the battery cells 5 manufactured by the lamination apparatus 300 to the packaging apparatus 400. In the packaging process, the packaging apparatus 400 packages the battery cells 5 in an exterior body. The exterior body contains the battery cells 5 inside and prevents liquids such as water present outside the exterior body from entering. Examples of the exterior body include an aluminum laminate film or an aluminum laminate sheet formed by covering a metal material such as aluminum with an insulating material. Specifically, the packaging apparatus 400 places the battery cells 5 on the exterior body, and further covers and seals the upper surface (front surface) and side surfaces of the battery cells 5 with the exterior body, thereby containing the battery cells 5 in the exterior body. Also, packaging may be performed so that a part of the lead connected to the electrode is drawn out to the outside of the exterior body.

[0037] A secondary battery (battery cell 5) can be obtained by going through a series of steps using the above manufacturing apparatus. As shown in FIG. 1, the battery cell 5 is formed by bonding a positive electrode 1 (positive electrode work-in-progress) on which a mesh 40 is placed and a negative electrode 2 (negative electrode work-in-progress) on which a separator 30 is placed, facing each other. In this manner, the mesh 40 and the separator 30 are arranged adjacent to each other, and the mesh 40 has higher ionic conductivity than the separator 30. Therefore, the electrodes of the battery cell 5 can suppress the reduction in ionic conductivity compared to a battery cell having two separators superposed between a positive electrode and a negative electrode. The manufacturing apparatus and manufacturing method for a secondary battery cell according to this embodiment can manufacture an electrode that can suppress the reduction in ionic conductivity that moves between the electrodes while suppressing the occurrence of unevenness in the positive electrode composition and the negative electrode composition during rolling.

[0038] <Modification> An example of a modified example of the manufacturing apparatus and manufacturing method for a secondary battery cell according to the embodiment described above will be described with reference to Fig. 5. Fig. 5 is a schematic perspective view showing an example of a modified example of a positive electrode manufacturing apparatus 100 among the manufacturing apparatuses for a secondary battery cell according to the embodiment described above and a modified example of a positive electrode manufacturing process by the positive electrode manufacturing apparatus 100. The positive electrode manufacturing apparatus 100 further includes a discharge unit 150 that discharges an electrolyte solution 151. Fig. 5 is the same as Fig. 3 except for the discharge unit 150, and therefore description thereof will be omitted.

[0039] In the embodiment, the mesh sheet 133 is pressed against and overlapped with the positive electrode composition 121 on the positive electrode current collector sheet 111, and the positive electrode composition 121 is rolled via the surface of the mesh sheet 133. However, when rolling in this manner, there is a risk that the mesh sheet 133 may absorb (contain) more electrolyte than necessary.

[0040] Therefore, before pressing the mesh sheet 133 against the positive electrode composition 121 and overlapping them, the following is performed. First, the positive electrode manufacturing apparatus 100 brings the nozzle of the discharge unit 150 close to between the back surface of the mesh sheet 133 and the surface of the positive electrode composition 121. Then, the electrolyte 151 is discharged from the nozzle onto the surface of the positive electrode composition 121. By doing so, the electrolyte 151 is allowed to permeate the positive electrode composition 121, so that the positive electrode composition 121 can sufficiently contain the electrolyte 151 even after rolling. In addition, since the mesh sheet 133 and the positive electrode composition 121 become familiar with each other during rolling, it is possible to make them more closely adhere to each other. Here, the electrolyte 151 is discharged from the nozzle of the discharge unit 150, but the electrolyte 151 may be sprayed in a mist form, or the electrolyte 151 may be applied with a brush or the like.

[0041] Although the above is described as a modified example of the positive electrode manufacturing process by the positive electrode manufacturing apparatus 100, it may be adopted as a modified example of the negative electrode manufacturing process by the negative electrode manufacturing apparatus 200. Although not particularly illustrated, in the modified example of the negative electrode manufacturing process by the negative electrode manufacturing apparatus 200, the following is performed before pressing and overlapping the separator sheet 233 against the negative electrode composition 221. First, the negative electrode manufacturing apparatus 200 brings the nozzle of the discharge unit 250 close to between the rear surface of the separator sheet 233 and the surface of the negative electrode composition 221. Then, the electrolyte 251 is discharged from the nozzle onto the surface of the negative electrode composition 221. In this way, the electrolyte 251 is permeated by the negative electrode composition 221, so that the negative electrode composition 221 can sufficiently contain the electrolyte 251 even after rolling. As described above, the electrolyte 251 may be sprayed in a mist form, or the electrolyte 251 may be applied with a brush or the like.

[0042] When rolling the positive electrode composition 121 via the surface of the mesh sheet 133 by the rolling unit 140, the mesh sheet 133 may be laid along the positive electrode composition 121 for several meters before rolling. When rolling the negative electrode composition 221 via the surface of the separator sheet 233 by the rolling unit 240, the separator sheet 233 may be laid along the negative electrode composition 221 for several meters before rolling.

[0043] The mesh supply unit 130 is provided with a tension roller 132, but may also be provided with an expander roll as a roller for removing wrinkles from the mesh sheet 133. The separator supply unit 230 is provided with a tension roller 232, but may also be provided with an expander roll as a roller for removing wrinkles from the separator sheet 233.

[0044] In addition, in the positive electrode manufacturing process, mesh sheet 133 is supplied and placed on positive electrode composition 121, and in the negative electrode manufacturing process, separator sheet 233 is supplied and placed on negative electrode composition 221. However, conversely, separator sheet 233 may be supplied and placed on positive electrode composition 121 in the positive electrode manufacturing process, and mesh sheet 133 may be supplied and placed on negative electrode composition 221 in the negative electrode manufacturing process.

[0045] The above describes the manufacturing apparatus and method for a secondary battery cell according to the embodiment and its modified examples of the present invention. However, the present invention is not limited to the above embodiment and its modified examples, and it goes without saying that the present invention also includes appropriate additions, modifications, and omissions made by a person skilled in the art within the scope of the technical concept of the present invention.

[0046] The secondary battery cells have been described as lithium-ion secondary battery cells, but may be other secondary battery cells, such as lead acid battery cells, nickel metal hydride battery cells, etc. [Industrial Applicability]

[0047] A secondary battery cell manufactured by the manufacturing apparatus and method for a secondary battery cell according to the present invention can be used in, for example, electric vehicles and hybrid vehicles. [Explanation of symbols]

[0048] 1 positive electrode 2 negative electrode 5 Battery Cells 10 Positive electrode current collector 11 Positive electrode composition layer 20 Negative electrode current collector 21 Negative electrode composition layer 30 Separator 40 Mesh 100 Positive electrode manufacturing equipment 110 Positive electrode current collector roll 111 Positive electrode current collector sheet 120 Positive electrode composition supply section 121 Positive electrode composition 130 Mesh supply section 131 Mesh roll 132 Tension roller 133 Mesh Sheet 140 Rolling Section 150 Discharge part 151 Electrolyte 200 Negative electrode manufacturing equipment 210 Negative electrode current collector roll 211 Negative electrode current collector sheet 220 Negative electrode composition supply section 221 Negative electrode composition 230 Separator supply section 231 Separator Roll 232 Tension roller 233 Separator Sheet 240 Rolling Section 300 Stacking device 400 Sealing device 1000 battery manufacturing equipment

Claims

1. a separator supply unit that supplies a separator by transporting a strip-shaped separator in the longitudinal direction and superimposing the strip-shaped separator on the first electrode composition transported in the longitudinal direction of the first electrode collector, the first electrode composition being placed on a strip-shaped first electrode current collector and transporting the separator in the longitudinal direction; a mesh supplying section that supplies a band-shaped mesh by transporting the band-shaped mesh in the longitudinal direction and superimposing the band-shaped mesh on the second electrode composition transported in the longitudinal direction of the second electrode collector; a first rolling section including a first rolling roller, the first rolling roller rolling the first electrode composition through the separator in a state in which the first rolling roller is in contact with a surface of the separator; a second rolling section including a second rolling roller, the second rolling roller rolling the second electrode composition through the mesh in a state in which the second rolling roller is in contact with a surface of the mesh; An apparatus for manufacturing an electrode for a secondary battery cell, comprising:

2. 2 . The secondary battery cell electrode manufacturing apparatus according to claim 1 , wherein the separator supply section and / or the mesh supply section further comprises the tension roller disposed before the rolling roller in the conveying direction.

3. 2. The electrode manufacturing apparatus for a secondary battery cell according to claim 1, further comprising: a first discharge section in the separator supplying section that discharges an electrolytic solution between a surface of the first electrode composition and a back surface of the separator before the separator is superimposed on the first electrode composition; and / or a second discharge section in the mesh supplying section that discharges an electrolytic solution between a surface of the second electrode composition and a back surface of the mesh before the mesh is superimposed on the second electrode composition.

4. a first preparation step of preparing a first electrode having a first electrode composition layer on a strip-shaped first electrode current collector; a second preparation step of preparing a second electrode having a second electrode composition layer on a strip-shaped second electrode current collector; a first rolling step of placing a separator on the first electrode composition layer, bringing a rolling roller into contact with a surface of the separator, and rolling the first electrode composition layer through the separator; a second rolling step of placing a mesh on the second electrode composition layer, bringing a rolling roller into contact with a surface of the mesh, and rolling the second electrode composition layer through the mesh; A method for manufacturing an electrode for a secondary battery cell comprising the steps of:

5. a first electrode current collector, a first electrode composition layer, a separator, a mesh, a second electrode composition layer, and a second electrode current collector, in that order; A secondary battery cell comprising:

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