Multi-layer coating device for manufacturing solid-state battery

Abstract

A multi-layer coating device for manufacturing a solid-state battery comprises a first unwinding mechanism which provides a first base material; a first roller for changing a traveling direction of the first substrate; the multi-layer coating mechanism is arranged on one side of the first passing roller and used for coating the first substrate with a first electrode layer, coating the first electrode layer with an electrolyte layer and coating the electrolyte layer with a second electrode layer; the second roller is arranged above the first roller and is used for covering the second electrode layer with a second base material unwound from the second unwinding mechanism so as to form a solid-state battery composite layer structure; the baking mechanism allows the solid-state battery composite layer structure to pass through and bakes the solid-state battery composite layer structure; and the winding mechanism is used for winding the baked solid-state battery composite layer structure. The utility model has the advantages that the coating is simple, and the solid-state battery is integrally formed.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-layer coating devices, in particular to a multi-layer coating device for manufacturing solid-state batteries. Background Art

[0002] Solid-state batteries are a new type of battery technology whose electrolyte is solid. Compared with traditional liquid batteries, solid-state batteries have the advantages of higher energy density, faster charging speed, higher safety and longer service life.

[0003] In the prior art, the preparation method of solid-state batteries generally includes the following steps: First, prepare the positive electrode, which is usually a mixture of active materials, conductive agents and binders, coated on a metal current collector (such as an aluminum substrate). The active material is the main place where the positive electrode undergoes redox reactions. The conductive agent is used to improve the conductivity of the positive electrode, while the binder is used to bond the active material and the conductive agent to the current collector. After coating, the positive electrode needs to be dried and pressed; second, prepare the negative electrode. The preparation of the negative electrode is similar to that of the positive electrode, and is also a mixture of active materials, conductive agents and binders coated on a metal current collector (such as a copper substrate). The negative electrode active material is usually a material that can reversibly embed and remove lithium ions, such as graphite or silicon-based materials. Similarly, the negative electrode also needs to be dried and pressed; third, the polymer electrolyte solution is prepared by dissolving a polymer (such as a vinyl electrolyte) in an organic solvent suitable for solid-state charge transfer (such as chloroform); fourth, the polymer electrolyte solution is combined with the positive and negative electrodes by coating or impregnation, and the polymer electrolyte solution is solidified on the positive and negative electrodes; fifth, the positive and negative electrodes with polymer electrolytes are combined to form a solid-state battery.

[0004] This method of manufacturing solid-state batteries has a complicated manufacturing process on the one hand, and unstable interface resistance at the contact interface between layers on the other hand. Utility Model Content

[0005] In order to solve the above problems, the utility model provides the society with a multi-layer coating device for manufacturing solid-state batteries, which can realize simple coating and integrally molded solid-state batteries.

[0006] The technical solution of the utility model is to provide a multilayer coating device for manufacturing solid-state batteries, comprising:

[0007] a first unwinding mechanism, wherein the first unwinding mechanism provides a first substrate;

[0008] a first roller, used to change the traveling direction of the first substrate;

[0009] a multilayer coating mechanism, disposed on one side of the first roller, for continuously coating a first electrode layer having a first active material on the first substrate, continuously coating an electrolyte layer having a solid electrolyte on the first electrode layer, and continuously coating a second electrode layer having a second active material on the electrolyte layer;

[0010] a second roller, the second roller being disposed above the first roller and covering the second substrate unwound from the second unwinding mechanism on the second electrode layer to form a solid-state battery composite layer structure;

[0011] A baking mechanism, allowing the solid-state battery composite layer structure to pass through and baking the solid-state battery composite layer structure;

[0012] A winding mechanism is used to roll up the baked solid-state battery composite layer structure.

[0013] As an improvement to the present utility model, the multilayer coating mechanism includes a material trough support plate, a first active material supplier, a first scraper, a solid electrolyte supplier, a second scraper, a second active material supplier and a third scraper arranged in sequence from bottom to top; the first scraper is used to determine the thickness of the first active material, the second scraper is used to determine the thickness of the solid electrolyte, and the third scraper is used to determine the thickness of the second active material.

[0014] As an improvement to the utility model, the utility model further comprises a first scraper adjuster, wherein the first scraper adjuster is used to adjust the distance between the first scraper and the first substrate.

[0015] As an improvement to the present invention, the present invention further comprises a second scraper adjuster, wherein the second scraper adjuster is used to adjust the distance between the second scraper and the first substrate.

[0016] As an improvement to the utility model, the utility model further comprises a third scraper adjuster, and the third scraper adjuster is used to adjust the distance between the third scraper and the first substrate.

[0017] As an improvement to the present utility model, the multilayer coating mechanism is a composite extrusion coating head, which includes, from bottom to top, a lower die, a first middle die, a second middle die and an upper die, a first coating gap for coating a first active material is provided between the lower die and the first middle die, a second coating gap for coating a solid electrolyte is provided between the first middle die and the second middle die, and a third coating gap for coating the first active material is provided between the second middle die and the upper die.

[0018] As an improvement to the present invention, the baking mechanism comprises a baking box, in which a plurality of rollers for allowing the first substrate to pass are arranged, and a plurality of heaters are arranged on the upper side and / or the lower side of the baking box.

[0019] As an improvement to the present utility model, the baking mechanism includes a third roller and a fourth roller, the third roller and the fourth roller are vertically arranged up and down, and a gap is provided between the third roller and the fourth roller for allowing the solid-state battery composite layer structure to pass through; the third roller is a heating roller, and when the solid-state battery composite layer structure passes through the gap, the solid-state battery composite layer structure is heated and compressed, so that the solid-state battery composite layer structure becomes thinner and denser.

[0020] As an improvement to the present invention, the first substrate is an aluminum substrate or a copper substrate.

[0021] As an improvement to the present invention, the second substrate is a copper substrate or an aluminum substrate.

[0022] The utility model adopts a matching structure of a multi-layer coating mechanism and a first roller, so that the first electrode layer, the electrolyte layer and the second electrode layer can be coated on the first substrate respectively by the multi-layer coating mechanism, and after the second substrate is covered, a semi-finished product of a solid-state battery is obtained. Therefore, the utility model has the advantages of simple coating and integrated solid-state battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the planar structure of the first embodiment of the utility model.

[0024] Figure 2 It is a schematic diagram of the planar structure of the second embodiment of the utility model.

[0025] Figure 3 It is a schematic diagram of the planar structure of the third embodiment of the utility model.

[0026] Figure 4 It is a schematic diagram of the planar structure of the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0027] See also Figure 1 , Figure 1Disclosed is a first embodiment of a multilayer coating device for manufacturing a solid-state battery, comprising a first unwinding mechanism (not shown), the first unwinding mechanism providing a first substrate 1; a first roller 2, used to change the traveling direction of the first substrate 1; a multilayer coating mechanism 3, provided on one side of the first roller 2, used to continuously coat a first electrode layer 11 having a first active material on the first substrate 1, continuously coat an electrolyte layer 12 having a solid electrolyte on the first electrode layer 11, and continuously coat a second electrode layer 13 having a second active material on the electrolyte layer 12;

[0028] In this embodiment, the first substrate 1 can be an aluminum substrate (aluminum foil) or a copper substrate (copper foil). When the first substrate 1 is an aluminum substrate, the first electrode layer 11 is a positive electrode active material, and the positive electrode active material is not limited to a mixture of a positive electrode material (including but not limited to LiCoO2, LiFePO4, LiMnO2, etc., the same below), a conductive agent (including but not limited to carbon black, carbon nanotubes, graphene and other carbon materials, the same below) and a binder (including but not limited to polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), polyacrylic acid (PAA) and other polymer materials); when the first substrate 1 is When the substrate is copper, the first electrode layer 11 is a negative electrode active material, and the negative electrode active material includes but is not limited to a mixture of a negative electrode material (such as graphite, silicon-based materials, lithium titanate (LTO), etc., the same below), a conductive agent (such as carbon black, carbon nanotubes, graphene and other carbon materials, the same below) and a binder (such as polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), polyacrylic acid (PAA) and other polymer materials, the same below); the polymer electrolyte solution constituting the electrolyte layer 12 includes but is not limited to a polymer (such as a vinyl electrolyte) dissolved in an organic solvent suitable for solid-state charge transfer (such as chloroform) (the same below);

[0029] A second roller 4, wherein the second roller 4 is disposed above the first roller 2, covers the second substrate 5 released from a second unwinding mechanism (not shown) on the second electrode layer 13 to form a solid-state battery composite layer structure 7; in this embodiment, the second substrate 5 is exactly opposite to the first substrate 1, and if the first substrate 1 uses an aluminum substrate, the second substrate 5 uses a copper substrate, and vice versa; a baking mechanism 6, allowing the solid-state battery composite layer structure 7 to pass through and baking the solid-state battery composite layer structure 7; a winding mechanism (not shown), wherein the winding mechanism winds up the baked solid-state battery composite layer structure 7.

[0030] In this embodiment, the multilayer coating mechanism 3 includes a material trough support plate 31, a first active material supplier 32, a first scraper 33 (the first scraper 33 serves to determine the thickness of the first electrode layer 11 on the one hand, and serves as a support plate for the solid electrolyte on the other hand, the same below), a solid electrolyte supplier 34, a second scraper 35 (the second scraper 35 serves to determine the thickness of the electrolyte layer 12 on the one hand, and serves as a support plate for the second electrode layer 12 on the other hand, the same below), a second active material supplier 36 and a third scraper 37, which are arranged in sequence from bottom to top; the first scraper 33 is used to determine the thickness of the first active material, the second scraper 35 is used to determine the thickness of the solid electrolyte, and the third scraper 37 is used to determine the thickness of the second active material.

[0031] Preferably, the utility model further includes a first scraper regulator, which is used to adjust the distance between the first scraper 33 and the first substrate 1, thereby determining the thickness of the first electrode layer 11. Preferably, the utility model further includes a second scraper regulator, which is used to adjust the distance between the second scraper 35 and the first substrate 1, thereby determining the thickness of the electrolyte layer 12; preferably, the utility model further includes a third scraper regulator, which is used to adjust the distance between the third scraper 37 and the first substrate 1, thereby determining the thickness of the second electrode layer 13.

[0032] In this embodiment, the baking mechanism 6 includes a baking box 61, in which a plurality of rollers 62 are provided for allowing the first substrate 1 to pass, and a plurality of heaters 63 are provided on the upper side and / or the lower side of the baking box 61; the heater 63 can be an electric heater or an oil heater.

[0033] See also Figure 2 , Figure 2 Disclosed is a second embodiment of a multilayer coating device for manufacturing a solid-state battery, comprising a first unwinding mechanism (not shown), the first unwinding mechanism providing a first substrate 1; a first roller 2, used to change the traveling direction of the first substrate 1; a multilayer coating mechanism 3, provided on one side of the first roller 2, used to continuously coat a first electrode layer 11 having a first active material on the first substrate 1, continuously coat an electrolyte layer 12 having a solid electrolyte on the first electrode layer 11, and continuously coat a second electrode layer 13 having a second active material on the electrolyte layer 12;

[0034] In this embodiment, the first substrate 1 may be an aluminum substrate (aluminum foil) or a copper substrate (copper foil). When the first substrate 1 is an aluminum substrate, the first electrode layer 11 is a positive electrode active material, which includes but is not limited to a mixture of a positive electrode material, a conductive agent and a binder. When the first substrate 1 is a copper substrate, the first electrode layer 11 is a negative electrode active material, which includes but is not limited to a mixture of a negative electrode material, a conductive agent and a binder. The polymer electrolyte solution constituting the electrolyte layer 12 includes but is not limited to a polymer (such as a vinyl electrolyte) dissolved in an organic solvent (such as chloroform) suitable for solid-state charge transfer.

[0035] A second roller 4, wherein the second roller 4 is disposed above the first roller 2, covers the second substrate 5 released from a second unwinding mechanism (not shown) on the second electrode layer 13 to form a solid-state battery composite layer structure 7; in this embodiment, the second substrate 5 is exactly opposite to the first substrate 1, and if the first substrate 1 uses an aluminum substrate, the second substrate 5 uses a copper substrate, and vice versa; a baking mechanism 6, allowing the solid-state battery composite layer structure 7 to pass through and baking the solid-state battery composite layer structure 7; a winding mechanism (not shown), wherein the winding mechanism winds up the baked solid-state battery composite layer structure 7.

[0036] In this embodiment, the multilayer coating mechanism 3 includes a trough support plate 31, a first active material supplier 32, a first scraper 33, a solid electrolyte supplier 34, a second scraper 35, a second active material supplier 36 and a third scraper 37, which are arranged in sequence from bottom to top; the first scraper 33 is used to determine the thickness of the first active material, the second scraper 35 is used to determine the thickness of the solid electrolyte, and the third scraper 37 is used to determine the thickness of the second active material.

[0037] Preferably, the utility model further includes a first scraper regulator, which is used to adjust the distance between the first scraper 33 and the first substrate 1, thereby determining the thickness of the first electrode layer 11. Preferably, the utility model further includes a second scraper regulator, which is used to adjust the distance between the second scraper 35 and the first substrate 1, thereby determining the thickness of the electrolyte layer 12; preferably, the utility model further includes a third scraper regulator, which is used to adjust the distance between the third scraper 37 and the first substrate 1, thereby determining the thickness of the second electrode layer 13.

[0038] In this embodiment, the baking mechanism 6 includes a third roller 8 and a fourth roller 9, and the third roller 8 and the fourth roller 9 are vertically arranged up and down, and a gap is provided between the third roller 8 and the fourth roller 9 to allow the solid-state battery composite layer structure 7 to pass through; the third roller 8 is a heating roller, and when the solid-state battery composite layer structure 7 passes through the gap, the solid-state battery composite layer structure 7 is heated and compressed, so that the solid-state battery composite layer structure 7 is pressed to become thinner and denser.

[0039] See also Figure 3 , Figure 3 Disclosed is a third embodiment of a multilayer coating device for manufacturing a solid-state battery, comprising a first unwinding mechanism (not shown), the first unwinding mechanism providing a first substrate 1; a first roller 2, used to change the traveling direction of the first substrate 1; a multilayer coating mechanism 3, provided on one side of the first roller 2, used to continuously coat a first electrode layer 11 having a first active material on the first substrate 1, continuously coat an electrolyte layer 12 having a solid electrolyte on the first electrode layer 11, and continuously coat a second electrode layer 13 having a second active material on the electrolyte layer 12;

[0040] In this embodiment, the first substrate 1 may be an aluminum substrate (aluminum foil) or a copper substrate (copper foil). When the first substrate 1 is an aluminum substrate, the first electrode layer 11 is a positive electrode active material, which includes but is not limited to a mixture of a positive electrode material (such as a compound containing lithium ions), a conductive agent and a binder; when the first substrate 1 is a copper substrate, the first electrode layer 11 is a negative electrode active material, which includes but is not limited to a mixture of a negative electrode material (such as graphite or silicon-based materials), a conductive agent and a binder; the polymer electrolyte solution constituting the electrolyte layer 12 includes but is not limited to a polymer (such as a vinyl electrolyte) dissolved in an organic solvent (such as chloroform) suitable for solid-state charge transfer;

[0041] A second roller 4, wherein the second roller 4 is disposed above the first roller 2, covers the second substrate 5 released from a second unwinding mechanism (not shown) on the second electrode layer 13 to form a solid-state battery composite layer structure 7; in this embodiment, the second substrate 5 is exactly opposite to the first substrate 1, and if the first substrate 1 uses an aluminum substrate, the second substrate 5 uses a copper substrate, and vice versa; a baking mechanism 6, allowing the solid-state battery composite layer structure 7 to pass through and baking the solid-state battery composite layer structure 7; a winding mechanism (not shown), wherein the winding mechanism winds up the baked solid-state battery composite layer structure 7.

[0042] In this embodiment, the multilayer coating mechanism 3 is a composite extrusion coating head, which includes a lower die 310, a first middle die 320, a second middle die 330 and an upper die 340 from bottom to top. A first coating gap 350 for coating a first active material is provided between the lower die 310 and the first middle die 320, a second coating gap 360 for coating a solid electrolyte is provided between the first middle die 320 and the second middle die 330, and a third coating gap 370 for coating a first active material is provided between the second middle die 330 and the upper die 340.

[0043] In this embodiment, the baking mechanism 6 includes a baking box 61, in which a plurality of rollers 62 are provided for allowing the first substrate 1 to pass, and a plurality of heaters 63 are provided on the upper side and / or the lower side of the baking box 61; the heater 63 can be an electric heater or an oil heater.

[0044] See also Figure 4 , Figure 4 Disclosed is a fourth embodiment of a multilayer coating device for manufacturing a solid-state battery, comprising a first unwinding mechanism (not shown), the first unwinding mechanism providing a first substrate 1; a first roller 2, used to change the traveling direction of the first substrate 1; a multilayer coating mechanism 3, provided on one side of the first roller 2, used to continuously coat a first electrode layer 11 having a first active material on the first substrate 1, continuously coat an electrolyte layer 12 having a solid electrolyte on the first electrode layer 11, and continuously coat a second electrode layer 13 having a second active material on the electrolyte layer 12;

[0045] In this embodiment, the first substrate 1 may be an aluminum substrate (aluminum foil) or a copper substrate (copper foil). When the first substrate 1 is an aluminum substrate, the first electrode layer 11 is a positive electrode active material, which includes but is not limited to a mixture of a positive electrode material, a conductive agent and a binder. When the first substrate 1 is a copper substrate, the first electrode layer 11 is a negative electrode active material, which includes but is not limited to a mixture of a negative electrode material, a conductive agent and a binder. The polymer electrolyte solution constituting the electrolyte layer 12 includes but is not limited to a polymer (such as a vinyl electrolyte) dissolved in an organic solvent (such as chloroform) suitable for solid-state charge transfer.

[0046] A second roller 4, wherein the second roller 4 is disposed above the first roller 2, covers the second substrate 5 released from a second unwinding mechanism (not shown) on the second electrode layer 13 to form a solid-state battery composite layer structure 7; in this embodiment, the second substrate 5 is exactly opposite to the first substrate 1, and if the first substrate 1 uses an aluminum substrate, the second substrate 5 uses a copper substrate, and vice versa; a baking mechanism 6, allowing the solid-state battery composite layer structure 7 to pass through and baking the solid-state battery composite layer structure 7; a winding mechanism (not shown), wherein the winding mechanism winds up the baked solid-state battery composite layer structure 7.

[0047] In this embodiment, the multilayer coating mechanism 3 is a composite extrusion coating head, which includes a lower die 310, a first middle die 320, a second middle die 330 and an upper die 340 from bottom to top. A first coating gap 350 for coating a first active material is provided between the lower die 310 and the first middle die 320, a second coating gap 360 for coating a solid electrolyte is provided between the first middle die 320 and the second middle die 330, and a third coating gap 370 for coating a first active material is provided between the second middle die 330 and the upper die 340.

[0048] Preferably, the baking mechanism 6 includes a third roller 8 and a fourth roller 9, and the third roller 8 and the fourth roller 9 are vertically arranged up and down, and a gap is provided between the third roller 8 and the fourth roller 9 to allow the solid-state battery composite layer structure 7 to pass through; the third roller 8 is a heating roller, and when the solid-state battery composite layer structure 7 passes through the gap, the solid-state battery composite layer structure 7 is heated and compressed, so that the solid-state battery composite layer structure 7 is pressed to become thinner and dense.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multilayer coating device for manufacturing solid-state batteries, characterized in that: include: A first unwinding mechanism, wherein the first unwinding mechanism provides a first substrate (1); A first roller (2) used to change the traveling direction of the first substrate (1); a multilayer coating mechanism (3) disposed on one side of the first roller (2), for continuously coating a first electrode layer (11) having a first active material on the first substrate (1), continuously coating an electrolyte layer (12) having a solid electrolyte on the first electrode layer (11), and continuously coating a second electrode layer (13) having a second active material on the electrolyte layer (12); a second roller (4), the second roller (4) being arranged above the first roller (2) and covering the second substrate (5) unrolled from the second unwinding mechanism on the second electrode layer (13) to form a solid-state battery composite layer structure (7); A baking mechanism (6) allows the solid-state battery composite layer structure (7) to pass through and bakes the solid-state battery composite layer structure (7); A winding mechanism, wherein the winding mechanism is used to wind up the baked solid-state battery composite layer structure (7).

2. The multilayer coating device for manufacturing a solid-state battery according to claim 1, characterized in that: The multilayer coating mechanism (3) comprises a trough support plate (31), a first active material supplier (32), a first scraper (33), a solid electrolyte supplier (34), a second scraper (35), a second active material supplier (36) and a third scraper (37) which are arranged in sequence from bottom to top; the first scraper (33) is used to determine the thickness of the first active material, the second scraper (35) is used to determine the thickness of the solid electrolyte, and the third scraper (37) is used to determine the thickness of the second active material.

3. The multilayer coating device for manufacturing a solid-state battery according to claim 2, characterized in that: It also includes a first scraper adjuster, which is used to adjust the distance between the first scraper (33) and the first substrate (1).

4. The multilayer coating device for manufacturing a solid-state battery according to claim 2, characterized in that: It also includes a second scraper adjuster, which is used to adjust the distance between the second scraper (35) and the first substrate (1).

5. The multi-layer coating device for manufacturing a solid-state battery according to claim 2, characterized in that: It also includes a third scraper adjuster, which is used to adjust the distance between the third scraper (37) and the first substrate (1).

6. The multi-layer coating device for manufacturing a solid-state battery according to claim 1, characterized in that: The multilayer coating mechanism (3) is a composite extrusion coating head, which comprises, from bottom to top, a lower die (310), a first middle die (320), a second middle die (330) and an upper die (340), wherein a first coating gap (350) for coating a first active material is provided between the lower die (310) and the first middle die (320), a second coating gap (360) for coating a solid electrolyte is provided between the first middle die (320) and the second middle die (330), and a third coating gap (370) for coating the first active material is provided between the second middle die (330) and the upper die (340).

7. The multilayer coating device for manufacturing a solid-state battery according to any one of claims 1 to 6, characterized in that: The baking mechanism (6) comprises a baking oven (61), wherein a plurality of rollers (62) are arranged inside the baking oven (61) for allowing the first substrate (1) to pass through, and a plurality of heaters (63) are arranged on the upper side and / or the lower side of the baking oven (61).

8. The multilayer coating device for manufacturing a solid-state battery according to any one of claims 1 to 6, characterized in that: The baking mechanism (6) comprises a third roller (8) and a fourth roller (9), wherein the third roller (8) and the fourth roller (9) are arranged vertically one above the other, and a gap is provided between the third roller (8) and the fourth roller (9) to allow the solid-state battery composite layer structure (7) to pass through; the third roller (8) is a heating roller, and when the solid-state battery composite layer structure (7) passes through the gap, the solid-state battery composite layer structure (7) is heated and compressed, so that the solid-state battery composite layer structure (7) becomes thinner and denser.

9. The multilayer coating device for manufacturing a solid-state battery according to any one of claims 1 to 6, characterized in that: The first substrate (1) is an aluminum substrate or a copper substrate.

10. The multilayer coating device for manufacturing a solid-state battery according to any one of claims 1 to 6, characterized in that: The second substrate (5) is a copper substrate or an aluminum substrate.

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