Dry-method dual-electrode pole piece structure and preparation equipment thereof

Abstract

The embodiment of the invention provides a dry-method dual-electrode pole piece structure and preparation equipment thereof, and the dry-method dual-electrode pole piece structure comprises a dual-electrode current collector which is provided with a positive electrode end and a negative electrode end, and the positive electrode end and the negative electrode end are oppositely distributed; the positive electrode end is thermally covered with the positive electrode active material through a dry process; and the negative electrode end is thermally covered with the negative electrode active material through a dry process. According to the present invention, the positive electrode active material and the negative electrode active material are thermally coated on the two opposite sides of the dual-electrode current collector through the dry process so as to achieve the thick coating of the positive electrode active material and the negative electrode active material under the condition of the limited coating area, and finally achieve the advantages of high safety and high energy density of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a dry-process dual-electrode pole piece structure and a preparation device thereof. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the manufacturing process of the battery, the positive and negative active materials are coated on the current collector, but the existing process cannot achieve thick coating of the active materials, so a process is urgently needed to solve this technical problem. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a dry dual-electrode pole piece structure and a preparation device thereof, which can solve the demand for thick coating of positive and negative electrode materials.

[0005] In a first aspect, an embodiment of the present application provides a dry dual-electrode pole piece structure, comprising: a dual-electrode current collector, which is configured with a positive terminal and a negative terminal, and the positive terminal is relatively distributed with the negative terminal; a positive electrode active material, which is heat-coated on the positive terminal through a dry process; and a negative electrode active material, which is heat-coated on the negative terminal through a dry process.

[0006] In the above-mentioned implementation process, both the positive electrode active material and the negative electrode active material are heat-coated on the opposite sides of the dual-electrode current collector through a dry process, which can achieve thick coating of the positive electrode active material and the negative electrode active material when the coating area is limited, ultimately achieving the advantages of high safety and high energy density of the battery.

[0007] In some embodiments, the dual-electrode current collector includes a conductive substrate layer, a negative electrode assembly and a positive electrode assembly, one end of the conductive substrate layer is connected to the negative electrode assembly, and the other end thereof is connected to the positive electrode assembly, the side of the negative electrode assembly facing away from the conductive substrate layer is connected to the negative electrode active material, and the side of the positive electrode assembly facing away from the conductive substrate layer is connected to the positive electrode active material.

[0008] In the above-mentioned implementation process, the negative electrode assembly and the positive electrode assembly are respectively connected to the opposite sides of the conductive substrate layer, which can efficiently collect and transmit charge carriers from the positive electrode active material and the negative electrode active material during the charging and discharging process. At the same time, the positive electrode active material and the negative electrode active material are respectively heat-coated on the double-electrode current collector to form a minimum stacking unit, and then the stacking units are stacked in series, which can simplify the packaging and cooling of the battery application.

[0009] In some embodiments, the positive electrode assembly includes a positive electrode current collector and a positive electrode conductive adhesive layer. The positive electrode conductive adhesive layer is configured in plurality. The plurality of positive electrode conductive adhesive layers are spaced apart and distributed along a first direction on a side of the positive electrode current collector away from the conductive substrate layer to form a filling space.

[0010] In the above-mentioned implementation process, the positive electrode conductive adhesive layer is distributed on the positive electrode current collector at intervals along the first aspect, so that the thickness can be cut at the filling space, and finally a small stacking unit is formed, and then the stacking units are stacked in series, which can simplify the packaging and cooling of battery applications. At the same time, the positive electrode conductive adhesive layer is thermally coated with the positive electrode active material, so that the positive electrode conductive adhesive layer can provide an electron conduction channel and bond the positive electrode active material under the action of pressure and temperature.

[0011] In some embodiments, the cross-sectional size of the positive electrode conductive adhesive layer is consistent with the cross-sectional size of the positive electrode active material. The positive electrode conductive adhesive layer can provide an electron conduction channel under the action of pressure and temperature, so that the battery has the advantages of high safety and high energy density.

[0012] In some embodiments, the positive electrode assembly further includes an insulating filling layer, and the insulating filling layer fills the filling space.

[0013] In the above implementation process, after the insulating filling layer is filled in the filling space, it is cut at the insulating filling layer to form a minimum stacking unit, and then the minimum stacking unit is densely stacked in multiple layers to form a double electrode pole piece. The series stacking of the double electrode pole pieces can simplify the packaging and cooling of battery applications.

[0014] In some embodiments, the negative electrode assembly includes a negative electrode current collector and a negative electrode conductive adhesive layer, wherein the negative electrode conductive adhesive layer is connected to a side of the negative electrode current collector that is away from the conductive substrate layer.

[0015] In some embodiments, the negative electrode assembly further includes a solid electrolyte connected to the negative electrode active material and the negative electrode current collector.

[0016] In a second aspect, the present application also provides an electrode structure preparation device, the preparation device is used to prepare a dual-electrode electrode structure, wherein the preparation device includes: a membrane device, including a negative electrode membrane mechanism and a positive electrode membrane mechanism, the negative electrode membrane mechanism and the positive electrode membrane mechanism are spaced apart along a preset direction, and the negative electrode membrane mechanism is used to prepare negative electrode active materials, and the positive electrode membrane mechanism is used to prepare positive electrode active materials; a current collector device, including a current collector mechanism, a negative electrode trimming mechanism, a positive electrode trimming mechanism and a positive electrode adsorption mechanism, the current collector mechanism is used to provide a dual-electrode current collector between the negative electrode membrane mechanism and the positive electrode membrane, the negative electrode trimming mechanism is located on one side of the negative electrode membrane mechanism, and is used to trim the negative electrode active material, the positive electrode trimming mechanism is located on one side of the positive electrode membrane mechanism, and is used to trim the positive electrode active material, wherein after trimming The negative electrode active material is heat-coated on one side of the dual-electrode current collector to form a negative electrode sheet, and the trimmed positive electrode active material is heat-coated on the other side of the dual-electrode current collector to form a positive electrode sheet, and the positive electrode adsorption mechanism is located on the other side of the positive electrode membrane mechanism, and is used to intermittently adsorb the positive electrode sheet so that the positive electrode sheet forms a filling space; the coating equipment includes a positive electrode coating mechanism, a negative electrode coating mechanism and a winding mechanism, the positive electrode coating mechanism is located on the side of the positive electrode sheet away from the negative electrode sheet, the negative electrode coating mechanism is located on the side of the negative electrode sheet away from the positive electrode sheet, and the positive electrode coating mechanism is used to coat an insulating filling layer to the filling space, the negative electrode coating mechanism is used to coat a solid electrolyte to the negative electrode sheet to form a dual-electrode sheet structure, and the winding mechanism is used to wind up the dual-electrode sheet structure.

[0017] In the above-mentioned implementation process, the negative electrode diaphragm mechanism prepares the negative electrode active material, the negative electrode trimming mechanism cuts off the wavy material on the edge of the negative electrode active material, the positive electrode diaphragm mechanism prepares the positive electrode active material, the positive electrode trimming mechanism cuts off the wavy material on the edge of the positive electrode active material, and at the same time, the dual-electrode current collector transported by the current collector mechanism passes through the negative electrode active material and the positive electrode active material whose wavy material has been cut off, and heat-coats the negative electrode active material and the positive electrode active material on the opposite sides of the dual-electrode current collector, and then the positive electrode adsorption mechanism intermittently adsorbs the positive electrode active material to form a filling space, the positive electrode coating mechanism fills the insulating filling layer in the filling space, the negative electrode coating mechanism coats the solid electrolyte on the negative electrode plate, and finally the dual-electrode plate structure is rolled up by the winding mechanism, and the dual-motor plate structure can be prepared by a dry process, effectively overcoming the problem that the positive and negative electrode active materials cannot be thickly coated.

[0018] In some embodiments, the negative electrode membrane structure includes a negative electrode blanking structure, a negative electrode film-forming structure and a negative electrode thinning structure, wherein the negative electrode blanking structure is located above the negative electrode film-forming structure, and is used to provide negative electrode fiberized powder to the negative electrode film-forming structure, and the negative electrode film-forming structure forms a negative electrode material film with the negative electrode fiberized powder, and the negative electrode thinning structure is located in the negative electrode film-forming structure, and is used to thin the negative electrode material film to form the negative electrode active material;

[0019] The positive electrode diaphragm structure includes a positive electrode blanking structure, a positive electrode film forming structure and a positive electrode thinning structure. The positive electrode blanking structure is located above the positive electrode film forming structure, and is used to provide positive electrode fibrous powder to the positive electrode film forming structure. The positive electrode film forming structure forms a positive electrode material film with the positive electrode fibrous powder. The positive electrode thinning structure is located in the positive electrode film forming structure, and is used to thin the positive electrode material film to form the positive electrode active material.

[0020] In the above-mentioned implementation process, the negative electrode blanking structure quantitatively and evenly transports the negative electrode fibrous powder to the negative electrode film-forming structure, and then the negative electrode film-forming structure performs film-forming treatment on the fibrous powder, and the negative electrode thinning structure thins the negative electrode material film, thereby forming a negative electrode active material with uniform thickness, and then the corrugated material is cut off from its edge and hot-coated on the dual-electrode current collector. The same principle is adopted for the preparation of the positive electrode active material, and finally a positive electrode active material with uniform thickness can be prepared, and hot-coated on the dual-electrode current collector, thereby overcoming the problem that the positive and negative electrode materials cannot be thickly coated by wet method.

[0021] In some embodiments, the rotation speeds of the negative electrode film forming structure and the negative electrode thinning structure are increased sequentially to form shear on the negative electrode fibrous powder and the negative electrode active material;

[0022] The rotation speeds of the positive electrode film-forming structure and the positive electrode thinning structure are increased sequentially to shear the positive electrode fiberized powder and the positive electrode active material.

[0023] In the above-mentioned implementation process, after the rotation speeds of the negative electrode film-forming structure and the negative electrode thinning structure are successively increased, a shear effect can be formed on the negative electrode fibrous powder and the negative electrode active material, which is beneficial to the formation of negative electrode active materials with uniform thickness. The negative electrode active materials are also prepared using the same principle, which is beneficial to the formation of positive electrode active materials with uniform thickness.

[0024] In some embodiments, the positive electrode coating mechanism includes a positive electrode double-cavity die head, a positive electrode transfer roller and a positive electrode heating module, wherein the positive electrode double-cavity die head is used to apply the insulating filling layer to the positive electrode transfer roller, the positive electrode transfer roller is arranged on one side of the positive electrode sheet to apply the insulating filling layer to the filling space, and the positive electrode heating module is arranged inside the positive electrode transfer roller to heat the insulating filling layer on the positive electrode transfer roller;

[0025] The negative electrode coating mechanism includes a negative electrode die head, a negative electrode transfer roller and a negative electrode heating module. The negative electrode die head is used to coat the solid electrolyte to the negative electrode transfer roller. The negative electrode transfer roller is arranged on one side of the negative electrode plate to coat the solid electrolyte to the negative electrode plate. The negative electrode heating module is arranged inside the negative electrode transfer roller to heat the solid electrolyte on the negative electrode transfer roller.

[0026] In the above-mentioned implementation process, when the dual-electrode pole piece moves to the coating structure position, the positive electrode dual-cavity die head coats the insulating filling layer on the positive electrode transfer roller, and the positive electrode heating module heats it to evaporate the solvent on the insulating filling layer, and then under the action of the positive electrode transfer roller, it is transferred to the positive electrode pole piece, and the negative electrode die head coats the solid electrolyte on the negative electrode transfer roller, and the negative electrode heating module heats it to evaporate the solvent on the solid electrolyte, and finally a dual-electrode pole piece structure with uniform thickness is prepared, which effectively overcomes the problem that the positive and negative electrode active materials cannot be thickly coated.

[0027] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the dry-process double-electrode pole piece structure provided in an embodiment of the present application;

[0031] Figure 2A schematic diagram of the structure of the smallest stacking unit of the dry-process double-electrode pole piece structure provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of a structure for stacking the minimum stacking units provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a double electrode current collector of a dry double electrode electrode sheet provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the principle of the preparation equipment provided in the embodiment of the present application;

[0035] Figure 6 A schematic diagram of the principle of preparing positive and negative electrode active materials for the preparation device provided in the embodiment of the present application;

[0036] Figure 7 A schematic structural diagram of a coating device for preparing equipment provided in an embodiment of the present application.

[0037] Reference numerals

[0038] 10. Dual-electrode current collector; 101. Conductive substrate layer; 102. Negative electrode assembly; 1021. Negative electrode current collector; 1022. Negative electrode conductive adhesive layer; 1023. Solid electrolyte; 1024. Negative electrode active material; 103. Positive electrode assembly; 1031. Positive electrode current collector; 1032. Positive electrode conductive adhesive layer; 1033. Filling space; 1034. Insulating filling layer; 1035. Positive electrode active material;

[0039] 20. Diaphragm equipment; 201. Negative electrode diaphragm mechanism; 2011. Negative electrode blanking piece; 2012. Negative electrode dispersion roller; 2013. First negative electrode film forming roller; 2014. Second negative electrode film forming roller; 2015. First negative electrode thinning roller; 2016. Second negative electrode thinning roller; 2017. Third negative electrode thinning roller; 202. Positive electrode diaphragm mechanism; 2021. Positive electrode blanking piece; 2022. Positive electrode dispersion roller; 2023. First positive electrode film forming roller; 2024. Second positive electrode film forming roller; 2025. First positive electrode thinning roller; 2026. Second positive electrode thinning roller; 2027. Third positive electrode thinning roller;

[0040] 30. Current collector device; 301. Current collector mechanism; 3011. Current collector unwinding member; 3012. Current collector conveying roller; 302. Negative electrode trimming mechanism; 303. Positive electrode trimming mechanism; 304. Positive electrode adsorption mechanism; 305. Waste conveying mechanism;

[0041] 40. Coating equipment; 401. Positive electrode coating mechanism; 4011. Positive electrode double-cavity die head; 4012. Positive electrode transfer roller; 4013. Positive electrode heating module; 402. Negative electrode coating mechanism; 4021. Negative electrode die head; 4022. Negative electrode transfer roller; 4023. Negative electrode heating module; 403. Winding mechanism; 404. Cooling roller;

[0042] 50. Negative electrode current collecting module;

[0043] 60. Positive electrode current collecting module. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0045] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0049] Example

[0050] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0051] During the design process, the inventors found that all-solid-state batteries have outstanding advantages in terms of high safety and high energy density. Currently, power batteries are mostly coated by wet coating. After the active material is evenly dispersed in a solvent, it is coated on the current collector by extrusion coating and other forms, and then the electrode sheet is prepared by a baking process. However, the thickness of the all-solid-state positive electrode sheet is relatively thick, and traditional wet coating cannot solve the problems of low baking efficiency and bulging edges caused by thick coating.

[0052] In view of this, if Figure 1-Figure 4 As shown, in the first aspect, an embodiment of the present application provides a dry dual-electrode pole piece structure, including: a dual-electrode current collector 10, which is configured with a positive terminal and a negative terminal, and the positive terminal is relatively distributed with the negative terminal; a positive electrode active material 1035, which is heat-coated on the positive terminal through a dry process; a negative electrode active material 1024, which is heat-coated on the negative terminal through a dry process.

[0053] Exemplarily, the positive electrode active material 1035 is configured to have a plurality of positive electrode active materials 1035, and the plurality of positive electrode active materials 1035 are spaced apart along a first direction, so that after the positive electrode active material 1035 is heat-coated on the dual-electrode current collector 10, an intermittent positive electrode sheet is formed, while the negative electrode active material 1024 is directly heat-coated on the dual-electrode current collector 10 using a dry process to form a negative electrode sheet.

[0054] In the above-mentioned implementation process, both the positive electrode active material 1035 and the negative electrode active material 1024 are heat-coated on the opposite sides of the dual-electrode current collector 10 through a dry process, which can achieve thick coating of the positive electrode active material 1035 and the negative electrode active material 1024 when the coating area is limited, ultimately achieving the advantages of high safety and high energy density of the battery.

[0055] like Figure 1-Figure 4As shown, the dual-electrode current collector 10 includes a conductive substrate layer 101, a negative electrode assembly 102 and a positive electrode assembly 103, one end of the conductive substrate layer 101 is connected to the negative electrode assembly 102, and the other end thereof is connected to the positive electrode assembly 103, the side of the negative electrode assembly 102 facing away from the conductive substrate layer 101 is connected to the negative electrode active material 1024, and the side of the positive electrode assembly 103 facing away from the conductive substrate layer 101 is connected to the positive electrode active material 1035.

[0056] In the above-mentioned implementation process, the negative electrode assembly 102 and the positive electrode assembly 103 are respectively connected to the opposite sides of the conductive substrate layer 101, and can efficiently collect and transport charge carriers from the positive electrode active material 1035 and the negative electrode active material 1024 during the charging and discharging process. At the same time, the positive electrode active material 1035 and the negative electrode active material 1024 are respectively heat-coated on the double-electrode current collector 10 to form a minimum stacking unit, and then the stacking units are stacked in series, which can simplify the packaging and cooling of the battery application.

[0057] like Figure 4 As shown, the positive electrode assembly 103 includes a positive electrode current collector 1031 and a positive electrode conductive adhesive layer 1032. The positive electrode conductive adhesive layer 1032 is configured with a plurality of positive electrode conductive adhesive layers 1032. The plurality of positive electrode conductive adhesive layers 1032 are distributed along a first direction at intervals on a side of the positive electrode current collector 1031 away from the conductive substrate layer 101 to form a filling space 1033.

[0058] Exemplarily, the first direction includes but is not limited to the left and right direction, and a plurality of the positive conductive adhesive layers 1032 are evenly spaced on the positive current collector 1031, and the positive active material 1035 is disposed on the side of each positive conductive adhesive layer 1032 facing away from the positive current collector 1031, and the positive active material 1035 is consistent in size with the positive conductive adhesive layer 1032, that is, the outer edge of the positive active material 1035 is flush with the outer edge of the positive conductive adhesive layer 1032, and at the same time, the outer edge size of the positive conductive adhesive layer 1032 is smaller than the outer edge size of the positive current collector 1031, including the length and width of the positive conductive adhesive layer 1032 are both smaller than the length and width of the positive current collector 1031, thereby forming the filling space 1033.

[0059] In the above-mentioned implementation process, the positive electrode conductive adhesive layer 1032 is distributed on the positive electrode current collector 1031 at intervals along the first aspect, so that the thickness can be cut at the filling space 1033, and finally a small stacking unit is formed, and then the stacking units are stacked in series, which can simplify the packaging and cooling of battery applications. At the same time, the positive electrode conductive adhesive layer 1032 is thermally coated with the positive electrode active material 1035, so that the positive electrode conductive adhesive layer 1032 can provide an electron conduction channel and bond the positive electrode active material 1035 under the action of pressure and temperature.

[0060] In some embodiments, the cross-sectional dimensions of the positive electrode conductive adhesive layer 1032 are consistent with the cross-sectional dimensions of the positive electrode active material 1035, that is, the length and width of the positive electrode conductive adhesive layer 1032 are consistent with the length and width of the positive electrode active material 1035, so that after the positive electrode active material 1035 is thermally coated on the positive electrode conductive adhesive layer 1032, the outer edge of the positive electrode conductive adhesive layer 1032 is flush with the outer edge of the positive electrode active material 1035. The positive electrode conductive adhesive layer 1032 can provide an electron conduction channel under the action of pressure and temperature, so that the battery has the advantages of high safety and high energy density.

[0061] In some embodiments, the positive electrode assembly 103 further includes an insulating filling layer 1034, and the insulating filling layer 1034 is filled in the filling space 1033. It can be understood that the insulating filling layer 1034 includes a first part and a second part, wherein the insulating filling layer 1034 in the first part is distributed along the width direction of the positive electrode assembly 103, and the insulating filling layer 1034 in the second part is distributed along the length direction of the positive electrode assembly 103 (that is, the first direction), and the thickness of the insulating filling layer 1034 is consistent with the sum of the thicknesses of the positive electrode conductive adhesive layer 1032 and the positive electrode active material 1035.

[0062] In the above implementation process, after the insulating filling layer 1034 is filled in the filling space 1033, it is cut at the insulating filling layer 1034 to form a minimum stacking unit, and then the minimum stacking unit is densely stacked in multiple layers to form a dual-electrode pole piece. The series stacking of the dual-electrode pole pieces can simplify the packaging and cooling of battery applications.

[0063] In some embodiments, the negative electrode assembly 102 includes a negative electrode current collector 1021 and a negative electrode conductive adhesive layer 1022 , wherein the negative electrode conductive adhesive layer 1022 is connected to a side of the negative electrode current collector 1021 that is away from the conductive substrate layer 101 .

[0064] Exemplarily, the length of the negative electrode conductive adhesive layer 1022 can be set to be consistent with the length of the negative electrode current collector 1021, the width of the negative electrode conductive adhesive layer 1022 is set to be smaller than the width of the negative electrode current collector 1021, the negative electrode active material 1024 is heat-coated on the negative electrode conductive adhesive layer 1022, and the outer edge of the negative electrode active material 1024 is flush with the outer edge of the negative electrode conductive adhesive layer 1022.

[0065] In some embodiments, the negative electrode assembly 102 further includes a solid electrolyte 1023 , and the solid electrolyte 1023 is connected to the negative electrode active material 1024 and the negative electrode current collector 1021 .

[0066] like Figure 5-Figure 7 As shown, in the second aspect, the present application also provides a pole piece structure preparation device, the preparation device is used to prepare a dual-electrode pole piece structure, wherein the preparation device comprises: a membrane device 20, comprising a negative electrode membrane mechanism 201 and a positive electrode membrane mechanism 202, the negative electrode membrane mechanism 201 and the positive electrode membrane mechanism 202 are spaced apart along a preset direction, and the negative electrode membrane mechanism 201 is used to prepare a negative electrode active material 1024, and the positive electrode membrane mechanism 202 is used to prepare a positive electrode active material 1035; a current collector device 30, The present invention comprises a current collector mechanism 301, a negative electrode trimming mechanism 302, a positive electrode trimming mechanism 303 and a positive electrode adsorption mechanism 304. The current collector mechanism 301 is used to provide a dual-electrode current collector 10 between the negative electrode membrane mechanism 201 and the positive electrode membrane. The negative electrode trimming mechanism 302 is located on one side of the negative electrode membrane mechanism 201 and is used to trim the negative electrode active material 1024. The positive electrode trimming mechanism 303 is located on one side of the positive electrode membrane mechanism 202 and is used to trim the positive electrode active material 1035. The trimmed negative electrode active material 1024 is heat-coated on one side of the dual-electrode current collector 10 to form a negative electrode sheet, and the trimmed positive electrode active material 1035 is heat-coated on the other side of the dual-electrode current collector 10 to form a positive electrode sheet, and the positive electrode adsorption mechanism 304 is located on the other side of the positive electrode membrane mechanism 202, and is used to intermittently adsorb the positive electrode sheet so that the positive electrode sheet forms a filling space 1033; the coating device 40 includes a positive electrode coating mechanism 401 and a negative electrode coating mechanism 402 and a winding mechanism 403, wherein the positive electrode coating mechanism 401 is located on the side of the positive electrode sheet away from the negative electrode sheet, the negative electrode coating mechanism 402 is located on the side of the negative electrode sheet away from the positive electrode sheet, and the positive electrode coating mechanism 401 is used to coat the insulating filling layer 1034 to the filling space 1033, the negative electrode coating mechanism 402 is used to coat the solid electrolyte 1023 to the negative electrode sheet to form a dual-electrode sheet structure, and the winding mechanism 403 is used to wind up the dual-electrode sheet structure.

[0067] Exemplarily, the negative electrode membrane structure 201 and the positive electrode membrane structure 202 are distributed along the horizontal direction, wherein the negative electrode membrane structure 201 and the positive electrode membrane structure 202 can be located at the same horizontal position, and the negative electrode active material 1024 and the positive electrode active material 1035 can be heat-coated on the dual-electrode current collector 10 at the same time. Of course, it is not excluded that the negative electrode membrane structure 201 and the positive electrode membrane structure 202 are located at different horizontal positions, and no specific limitation is made here.

[0068] The current collector mechanism 301 includes a current collector unwinding member 3011 and a current collector conveying roller, wherein the current collector unwinding member 3011 is used to convey the dual-electrode current collector 10 attached to the current collecting conveying roller 3012, and then convey it to between the negative electrode diaphragm mechanism 201 and the positive electrode diaphragm mechanism 202 through the current collecting conveying roller 3012, wherein the current collecting conveying roller 3012 is configured with a plurality of current collecting conveying rollers 3012, and the plurality of current collecting conveying rollers 3012 are distributed at different positions, for example, the current collecting conveying rollers 3012 are configured with four, which can be used to adjust the tension of the dual-electrode current collector 10 attached.

[0069] The negative electrode trimming mechanism 302 and the positive electrode trimming mechanism 303 are each configured with one, and the negative electrode trimming mechanism 302 and the positive electrode trimming mechanism 303 can be located at the same horizontal position. The negative electrode trimming mechanism 302 is located at the upper end of the negative electrode diaphragm mechanism 201, and is used to cut off the edge wavy material of the negative electrode active material 1024 output by the negative electrode diaphragm mechanism 201, so that the size of the negative electrode active material 1024 after trimming is consistent with that of the negative electrode conductive adhesive layer 1022. The positive electrode trimming mechanism 303 is located at the upper end of the positive electrode diaphragm mechanism 202, and is used to cut off the edge wavy material of the positive electrode active material 1035 output by the positive electrode diaphragm mechanism 202, so that the size of the positive electrode active material 1035 after trimming is consistent with that of the positive electrode conductive adhesive layer 1032.

[0070] The positive electrode adsorption mechanism 304 is located below the positive electrode membrane mechanism 202. When the positive electrode sheet has not passed through the positive electrode adsorption mechanism 304, the positive electrode active material 1035 of the positive electrode sheet not only has a structure located at the positive electrode conductive adhesive layer 1032, but also has a structure located between two adjacent positive electrode conductive adhesive layers 1032, that is, the positive electrode active material 1035 can cover the filling space 1033 formed by the two adjacent positive electrode conductive adhesive layers 1032, and after being adsorbed by the positive electrode adsorption mechanism 304, the positive electrode active material 1035 in the filling space 1033 can be adsorbed to form an intermittent positive electrode sheet, thereby facilitating the subsequent positive electrode coating mechanism 401 to fill the insulating filling layer 1034 in the filling space 1033.

[0071] It can be understood that after the winding mechanism 403 rolls up the dual-electrode pole piece structure, a dual-electrode roll is formed, and after the dual-electrode roll is cut at the filling space 1033, it can become the smallest stacking unit. After being stacked, the stacking unit is equipped with a positive electrode current collecting module 60 and a negative electrode current collecting module 50 to form a stacked battery, that is, an all-solid-state battery.

[0072] In the above-mentioned implementation process, the negative electrode diaphragm mechanism 201 prepares the negative electrode active material 1024, the negative electrode trimming mechanism 302 cuts off the edge wave material of the negative electrode active material 1024, the positive electrode diaphragm mechanism 202 prepares the positive electrode active material 1035, and the positive electrode trimming mechanism 303 cuts off the edge wave material of the positive electrode active material 1035. At the same time, the double-electrode current collector 10 transported by the current collector mechanism 301 passes through the negative electrode active material 1024 and the positive electrode active material 1035 whose wave material is cut off, and the negative electrode active material 1024 and the positive electrode active material 1035 are cut off. 5 is heat-coated on the opposite sides of the dual-electrode current collector 10, and then the positive electrode adsorption mechanism 304 intermittently adsorbs the positive electrode active material 1035 to form a filling space 1033, and the positive electrode coating mechanism 401 fills the insulating filling layer 1034 in the filling space 1033, and the negative electrode coating mechanism 402 coats the solid electrolyte 1023 on the negative electrode sheet, and finally the dual-electrode sheet structure is rolled up by the rolling mechanism 403, so that the dual-motor sheet structure can be prepared by a dry process, effectively overcoming the problem that the positive and negative electrode active materials 1024 cannot be thickly coated.

[0073] like Figure 6As shown, the negative electrode membrane mechanism 201 includes a negative electrode blanking structure, a negative electrode film-forming structure and a negative electrode thinning structure. The negative electrode blanking structure is located above the negative electrode film-forming structure and is used to provide negative electrode fiberized powder to the negative electrode film-forming structure. The negative electrode film-forming structure forms a negative electrode material film with the negative electrode fiberized powder. The negative electrode thinning structure is located in the negative electrode film-forming structure and is used to thin the negative electrode material film to form the negative electrode active material 1024.

[0074] The positive electrode diaphragm mechanism 202 includes a positive electrode blanking structure, a positive electrode film forming structure and a positive electrode thinning structure. The positive electrode blanking structure is located above the positive electrode film forming structure, and is used to provide positive electrode fibrous powder to the positive electrode film forming structure. The positive electrode film forming structure forms a positive electrode material film with the positive electrode fibrous powder. The positive electrode thinning structure is located in the positive electrode film forming structure, and is used to thin the positive electrode material film to form the positive electrode active material 1035.

[0075] Exemplarily, the negative electrode blanking mechanism includes a negative electrode blanking piece 2011 and a negative electrode dispersing roller 2012. Two negative electrode dispersing rollers 2012 are configured, and the two negative electrode dispersing rollers 2012 are distributed in the inner cavity of the negative electrode blanking piece 2011 to evenly drop the fiberized powder in the negative electrode blanking piece 2011 into the roller gap of the negative electrode film-forming structure, that is, the negative electrode dispersing roller 2012 is used to roll dry materials and quantitatively and evenly transport the fiberized powder.

[0076] The negative electrode film-forming structure includes a first negative electrode film-forming roller 2013 and a second negative electrode film-forming roller 2014, wherein the first negative electrode film-forming roller 2013, the second negative electrode film-forming roller 2014 and the negative electrode thinning structure are located on the same horizontal line, and the first negative electrode film-forming roller 2013 and the second negative electrode film-forming roller 2014 are spaced apart, the rotation speed of the first negative electrode film-forming roller 2013 is less than the rotation speed of the second negative electrode film-forming roller 2014, the rotation speed of the second negative electrode film-forming roller 2014 is less than the rotation speed of the first negative electrode thinning roller 2015 of the negative electrode thinning structure, and the first negative electrode The rotation direction of the film-forming roller 2013 is opposite to that of the second negative electrode film-forming roller 2014, the rotation direction of the first negative electrode film-forming roller 2013 is consistent with that of the first negative electrode thinning roller 2015, the distance between the first negative electrode film-forming roller 2013 and the second negative electrode film-forming roller 2014 is greater than the distance between the second negative electrode film-forming roller 2014 and the first negative electrode thinning roller 2015, the roller temperature of the first negative electrode film-forming roller 2013 and the second negative electrode film-forming roller 2014 is in the range of 100-150°C, and the pressure is in the range of 5T-30T.

[0077] The negative electrode thinning structure includes a first negative electrode thinning roller 2015, a second negative electrode thinning roller 2016 and a third negative electrode thinning roller 2017, wherein the first negative electrode thinning roller 2015, the second negative electrode thinning roller 2016 and the third negative electrode thinning roller 2017 are located on the same horizontal line, the rotation speed of the first negative electrode thinning roller 2015 is less than the rotation speed of the second negative electrode thinning roller 2016, the rotation speed of the second negative electrode thinning roller 2016 is less than the rotation speed of the third negative electrode thinning roller 2017, and the first negative electrode thinning roller 2015 and the third negative electrode thinning roller 2017 have the same rotation direction, and the second negative electrode thinning roller 2016 and the first negative electrode thinning roller 2017 have the same rotation direction. The rotation directions of the thinning roller 2015 are opposite, the distance between the first negative electrode thinning roller 2015 and the second negative electrode thinning roller 2016 is greater than the distance between the second negative electrode thinning roller 2016 and the third negative electrode thinning roller 2017, the roller temperatures of the first negative electrode thinning roller 2015, the second negative electrode thinning roller 2016 and the third negative electrode thinning roller 2017 are in the range of 100-150°C, and the pressure is in the range of 5T-30T, and the third negative electrode thinning roller 2017 is used to thermally coat the negative active material 1024 on the negative conductive adhesive layer 1022, wherein the thermal coating temperature is in the range of 100-150°C, and the pressure is in the range of 5T-30T.

[0078] The positive electrode blanking mechanism includes a positive electrode blanking piece 2021 and a positive electrode dispersing roller 2022. The distribution and principle of the positive electrode blanking piece 2021 and the positive electrode dispersing roller 2022 can be set to be consistent with the negative electrode blanking mechanism; the positive electrode film-forming structure includes a first positive electrode film-forming roller 2023 and a second positive electrode film-forming roller 2024. The distribution and principle of the first positive electrode film-forming roller 2023 and the second positive electrode film-forming roller 2024 can be set to be consistent with the negative electrode film-forming structure; the positive electrode thinning structure includes a first positive electrode thinning roller 2025, a second positive electrode thinning roller 2026 and a third positive electrode thinning roller 2027. The distribution and principle of the first positive electrode thinning roller 2025, the second positive electrode thinning roller 2026 and the third positive electrode thinning roller 2027 can be set to be consistent with the positive electrode thinning structure, which will not be repeated here.

[0079] The current collector device 30 further includes a waste conveying mechanism 305, which includes a waste conveying belt. The waste conveying mechanism 305 is disposed below the positive electrode adsorption mechanism 304 to convey the positive electrode active material 1035 adsorbed by the positive electrode adsorption mechanism 304. The positive electrode adsorption mechanism 304 adsorbs the positive electrode active material 1035 located between two adjacent positive electrode conductive adhesive layers 1032. When the positive electrode adsorption mechanism 304 rotates to the top of the waste conveying mechanism 305, the negative pressure is broken, and the adsorbed positive electrode active material 1035 falls to the waste conveying mechanism 305 under the action of gravity, so as to realize the recycling of waste materials, which is beneficial to the thickness uniformity when the subsequent coating structure heat-coats the filling coating on the filling space 1033.

[0080] In the above-mentioned implementation process, the negative electrode blanking structure quantitatively and evenly transports the negative electrode fibrous powder to the negative electrode film-forming structure, and then the negative electrode film-forming structure performs film-forming treatment on the fibrous powder, and the negative electrode thinning structure thins the negative electrode material film to form a negative electrode active material 1024 with uniform thickness, and then the corrugated material is cut off from its edge and heat-coated on the dual-electrode current collector 10. The same principle is adopted for the preparation of the positive electrode active material 1035, and finally the positive electrode active material 1035 with uniform thickness can be prepared and heat-coated on the dual-electrode current collector 10, thereby overcoming the problem that the positive and negative electrode materials cannot be thickly coated by wet method.

[0081] In some embodiments, the rotation speeds of the negative electrode film forming structure and the negative electrode thinning structure are increased sequentially to form shear on the negative electrode fibrous powder and the negative electrode active material 1024;

[0082] The rotation speeds of the positive electrode film-forming structure and the positive electrode thinning structure are increased sequentially to shear the positive electrode fibrous powder and the positive electrode active material 1035 .

[0083] In the above-mentioned implementation process, after the rotation speeds of the negative electrode film-forming structure and the negative electrode thinning structure are successively increased, a shear effect can be formed on the negative electrode fibrous powder and the negative electrode active material 1024, which is beneficial to forming a negative electrode active material 1024 with uniform thickness. The negative electrode active material 1024 is also prepared using the same principle, which is beneficial to forming a positive electrode active material 1035 with uniform thickness.

[0084] like Figure 7As shown, the positive electrode coating mechanism 401 includes a positive electrode double-cavity die head 4011, a positive electrode transfer roller 4012 and a positive electrode heating module 4013, the positive electrode double-cavity die head 4011 is used to apply the insulating filling layer 1034 to the positive electrode transfer roller 4012, the positive electrode transfer roller 4012 is arranged on one side of the positive electrode plate, so as to apply the insulating filling layer 1034 to the filling space 1033, and the positive electrode heating module 4013 is arranged inside the positive electrode transfer roller 4012, so as to heat the insulating filling layer 1034 on the positive electrode transfer roller 4012;

[0085] Exemplarily, the positive electrode dual-cavity die 4011 includes an upper cavity and a lower cavity, wherein the upper cavity is used for continuously coating the second portion of the insulating filling layer 1034 , and the lower cavity is used for intermittently coating the first portion of the insulating filling layer 1034 .

[0086] It should be noted that when the insulating filling layer 1034 of the positive electrode plate is not dry enough, the dual-electrode plate structure may be subjected to an oven baking treatment.

[0087] A cooling roller 404 may be provided between the positive electrode coating mechanism 401 and the positive electrode adsorption mechanism 304 , so that the positive electrode sheet adsorbed by the positive electrode adsorption mechanism 304 is cooled by the cooling roller 404 , and then the positive electrode coating mechanism 401 coats the insulating filling layer 1034 on the filling space 1033 .

[0088] The negative electrode coating mechanism 402 includes a negative electrode die head 4021, a negative electrode transfer roller 4022 and a negative electrode heating module 4023. The negative electrode die head 4021 is used to coat the solid electrolyte 1023 onto the negative electrode transfer roller 4022. The negative electrode transfer roller 4022 is arranged on one side of the negative electrode plate to coat the solid electrolyte 1023 onto the negative electrode plate. The negative electrode heating module 4023 is arranged inside the negative electrode transfer roller 4022 to heat the solid electrolyte 1023 on the negative electrode transfer roller 4022.

[0089] In the above-mentioned implementation process, when the dual-electrode pole piece moves to the coating structure position, the positive electrode dual-cavity die head 4011 coats the insulating filling layer 1034 on the positive electrode transfer roller 4012, and the positive electrode heating module 4013 heats it to evaporate the solvent on the insulating filling layer 1034, and then under the action of the positive electrode transfer roller 4012, it is transferred to the positive electrode pole piece, and the negative electrode die head coats the solid electrolyte 1023 on the negative electrode transfer roller 4022, and the negative electrode heating module 4023 heats it to evaporate the solvent on the solid electrolyte 1023, and finally prepares a dual-electrode pole piece structure with uniform thickness, which effectively overcomes the problem that the positive and negative electrode active materials 1024 cannot be thickly coated.

[0090] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0091] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0092] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0093] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A dry double electrode plate structure, characterized in that: include: A dual-electrode current collector, which is configured with a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are arranged relative to each other; A positive electrode active material, which is thermally coated on the positive electrode terminal by a dry process; The negative electrode active material is thermally coated on the negative electrode terminal through a dry process.

2. The dry double electrode plate structure according to claim 1, characterized in that: The dual-electrode current collector includes a conductive substrate layer, a negative electrode assembly and a positive electrode assembly, one end of the conductive substrate layer is connected to the negative electrode assembly, and the other end is connected to the positive electrode assembly, the side of the negative electrode assembly facing away from the conductive substrate layer is connected to the negative electrode active material, and the side of the positive electrode assembly facing away from the conductive substrate layer is connected to the positive electrode active material.

3. The dry double electrode plate structure according to claim 2, characterized in that: The positive electrode assembly includes a positive electrode current collector and a positive electrode conductive adhesive layer. The positive electrode conductive adhesive layer is configured in plurality. The plurality of positive electrode conductive adhesive layers are distributed along a first direction at intervals on a side of the positive electrode current collector away from the conductive substrate layer to form a filling space.

4. The dry-process double-electrode pole piece structure according to claim 3, characterized in that: The cross-sectional size of the positive electrode conductive adhesive layer is consistent with the cross-sectional size of the positive electrode active material.

5. The dry-process double-electrode pole piece structure according to claim 4, characterized in that: The positive electrode assembly further includes an insulating filling layer, and the insulating filling layer is filled in the filling space.

6. The dry-process double-electrode pole piece structure according to any one of claims 2 to 5, characterized in that: The negative electrode assembly includes a negative electrode current collector and a negative electrode conductive adhesive layer, wherein the negative electrode conductive adhesive layer is connected to a side of the negative electrode current collector away from the conductive substrate layer.

7. The dry-process double-electrode pole piece structure according to claim 6, characterized in that: The negative electrode assembly further includes a solid electrolyte connected to the negative electrode active material and the negative electrode current collector.

8. A pole piece structure preparation device, characterized in that: The preparation equipment is used to prepare a dual-electrode pole piece structure, wherein the preparation equipment comprises: A diaphragm device, comprising a negative electrode diaphragm mechanism and a positive electrode diaphragm mechanism, wherein the negative electrode diaphragm mechanism and the positive electrode diaphragm mechanism are spaced apart from each other along a preset direction, and the negative electrode diaphragm mechanism is used to prepare negative electrode active materials, and the positive electrode diaphragm mechanism is used to prepare positive electrode active materials; A current collector device, comprising a current collector mechanism, a negative electrode trimming mechanism, a positive electrode trimming mechanism and a positive electrode adsorption mechanism, wherein the current collector mechanism is used to provide a dual-electrode current collector between the negative electrode membrane mechanism and the positive electrode membrane, the negative electrode trimming mechanism is located on one side of the negative electrode membrane mechanism, and is used to trim the negative electrode active material, the positive electrode trimming mechanism is located on one side of the positive electrode membrane mechanism, and is used to trim the positive electrode active material, wherein the trimmed negative electrode active material is thermally coated on one side of the dual-electrode current collector to form a negative electrode sheet, the trimmed positive electrode active material is thermally coated on the other side of the dual-electrode current collector to form a positive electrode sheet, and the positive electrode adsorption mechanism is located on the other side of the positive electrode membrane mechanism, and is used to intermittently adsorb the positive electrode sheet so that the positive electrode sheet forms a filling space; The coating equipment includes a positive electrode coating mechanism, a negative electrode coating mechanism and a winding mechanism, wherein the positive electrode coating mechanism is located on the side of the positive electrode sheet away from the negative electrode sheet, the negative electrode coating mechanism is located on the side of the negative electrode sheet away from the positive electrode sheet, and the positive electrode coating mechanism is used to coat an insulating filling layer to the filling space, the negative electrode coating mechanism is used to coat a solid electrolyte to the negative electrode sheet to form a dual-electrode sheet structure, and the winding mechanism is used to wind up the dual-electrode sheet structure.

9. The pole piece structure preparation equipment according to claim 8, characterized in that: The negative electrode membrane structure includes a negative electrode blanking structure, a negative electrode film-forming structure and a negative electrode thinning structure. The negative electrode blanking structure is located above the negative electrode film-forming structure and is used to provide negative electrode fiberized powder to the negative electrode film-forming structure. The negative electrode film-forming structure forms a negative electrode material film with the negative electrode fiberized powder. The negative electrode thinning structure is located in the negative electrode film-forming structure and is used to thin the negative electrode material film to form the negative electrode active material. The positive electrode diaphragm structure includes a positive electrode blanking structure, a positive electrode film forming structure and a positive electrode thinning structure. The positive electrode blanking structure is located above the positive electrode film forming structure, and is used to provide positive electrode fibrous powder to the positive electrode film forming structure. The positive electrode film forming structure forms a positive electrode material film with the positive electrode fibrous powder. The positive electrode thinning structure is located in the positive electrode film forming structure, and is used to thin the positive electrode material film to form the positive electrode active material.

10. The pole piece structure preparation equipment according to claim 9, characterized in that: The rotation speeds of the negative electrode film forming structure and the negative electrode thinning structure are increased in sequence to shear the negative electrode fiberized powder and the negative electrode active material; The rotation speeds of the positive electrode film-forming structure and the positive electrode thinning structure are increased sequentially to shear the positive electrode fiberized powder and the positive electrode active material.

11. The pole piece structure preparation equipment according to claim 8, characterized in that: The positive electrode coating mechanism comprises a positive electrode double-cavity die head, a positive electrode transfer roller and a positive electrode heating module, wherein the positive electrode double-cavity die head is used to apply the insulating filling layer to the positive electrode transfer roller, the positive electrode transfer roller is arranged on one side of the positive electrode sheet to apply the insulating filling layer to the filling space, and the positive electrode heating module is arranged inside the positive electrode transfer roller to heat the insulating filling layer on the positive electrode transfer roller; The negative electrode coating mechanism includes a negative electrode die head, a negative electrode transfer roller and a negative electrode heating module. The negative electrode die head is used to coat the solid electrolyte to the negative electrode transfer roller. The negative electrode transfer roller is arranged on one side of the negative electrode plate to coat the solid electrolyte to the negative electrode plate. The negative electrode heating module is arranged inside the negative electrode transfer roller to heat the solid electrolyte on the negative electrode transfer roller.

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