Positive electrode pole piece structure and manufacturing equipment

Abstract

The embodiment of the invention provides a positive electrode pole piece structure and manufacturing equipment, and the structure comprises a current collector which is provided with a coating surface, and the current collector is configured to be distributed along a first direction; the conductive coatings are configured to be distributed on the coating surface at intervals in the first direction, and the size of the conductive coatings is smaller than that of the current collector so as to form a cavity part; and the filling coating is filled in the cavity part, and the thickness of the filling coating located in the cavity part is consistent. The conductive coating is attached to the current collector to form the cavity part, and the thickness of the structure of the cavity part filled with the filling coating is consistent, so that the problem of fracturing caused by uneven interlayer thickness of the positive plate after isostatic pressing treatment of the solid-state battery can be avoided, and the product performance is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a positive electrode pole piece structure and manufacturing equipment. 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 development of batteries, in order to ensure the high performance of the batteries, the coating of the positive electrode is particularly important. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a positive electrode pole piece structure and manufacturing equipment, which can solve the problem that the coating cannot be applied evenly.

[0005] In the first aspect, an embodiment of the present application provides a positive electrode plate structure, comprising: a current collector, which is configured with a coating surface, and the current collector is configured to be distributed along a first direction; a conductive coating, which is configured to be distributed on the coating surface at intervals along the first direction, and the size of the conductive coating is smaller than the size of the current collector to form a void portion; a filling coating, which fills the void portion, and the thickness of the filling coating located in the void portion is consistent.

[0006] In the above implementation process, the conductive coating is attached to the current collector to form a void portion, and the structural thickness of the filling coating filled in the void portion is consistent, which can avoid the fracturing problem caused by uneven interlayer thickness of the positive electrode sheet after static pressing treatment of the solid-state battery, thereby improving the performance of the product.

[0007] In some embodiments, in a second direction, a size of the conductive coating is smaller than a size of the current collector, wherein the first direction is perpendicular to the second direction.

[0008] In the above implementation process, by making the size of the conductive coating smaller than the size of the current collector along the first direction and the second direction, a void portion is formed after the conductive coating is attached to the current collector, which facilitates the filling of the coating in the void portion. At the same time, the conductive coating can provide an electron conduction channel under the action of pressure and temperature.

[0009] In some embodiments, the filling coating includes a first coating, the first coating is disposed between two adjacent conductive coatings, and along the second direction, a size of the first coating is consistent with a size of the conductive coating.

[0010] In some embodiments, the filling coating further includes a second coating, the second coating is disposed on the coating surface, and the second coating is located at an outer edge of the conductive coating.

[0011] In some embodiments, the positive electrode sheet structure further includes a positive active layer, the positive active layer is located on a side of the conductive coating layer away from the current collector, and an edge of the positive active layer is flush with an edge of the conductive coating layer.

[0012] In a second aspect, the present application also provides a manufacturing device, which is used to prepare a positive electrode pole piece structure, wherein the manufacturing device comprises: a material device, including a material structure, a film-forming structure and a thinning structure, wherein the material structure is used to provide a fibrous powder to the film-forming structure, the film-forming structure is arranged on one side of the material structure, and is used to form a material film for the fibrous powder, and the thinning structure is arranged on one side of the film-forming structure, and is used to thin the material film to form a positive electrode active layer; a laminating device, including a current collecting structure, a trimming structure and an adsorption structure, and the current collecting structure is used to provide the thinning structure A current collector coated with a conductive coating is transported, wherein the trimming structure is arranged on one side of the thinning structure, and is used to trim the positive electrode active layer, wherein the positive electrode active layer after trimming is used to be thermally laminated with the conductive coating to form a pole piece, and the adsorption structure is arranged on the other side of the thinning structure, and is used to adsorb the pole piece to form an intermittent pole piece with a void portion; a coating device comprises a coating structure and a winding structure, wherein the coating structure is arranged on one side of the adsorption structure, and is used to apply a filling coating to the void portion to form a pole piece structure, and the winding structure is used to wind up the pole piece structure.

[0013] In the above-mentioned implementation process, the material structure uniformly transports fiberized powder to the film-forming structure, and then thins it by the thinning structure to form a positive electrode active layer with uniform thickness. The trimming structure removes the edge wave material of the positive electrode active layer, and the current collecting structure transports the current collector with a conductive coating attached to the position of the thinning structure, so that the positive electrode active layer is thermally coated on the conductive coating. Subsequently, the adsorption structure adsorbs the positive electrode active layer at the hollow part formed when the conductive coating is attached to the current collector, thereby forming an intermittent pole piece with a hollow part. The coating device coats the filling coating on the hollow part, and finally forms a pole piece structure with a filling coating of uniform thickness, thereby solving the problem of the coating not being able to be uniformly coated, and avoiding the fracturing problem of the positive pole piece due to uneven interlayer thickness after static pressing treatment of solid-state batteries.

[0014] In some embodiments, the thinning structure includes a first thinning roller, a second thinning roller and a third thinning roller, the rotation speed of the first thinning roller is less than the rotation speed of the second thinning roller, the rotation speed of the second thinning roller is less than the rotation speed of the third thinning roller, and the first thinning roller has the same rotation direction as the third thinning roller, and the second thinning roller has an opposite rotation direction to the first thinning roller.

[0015] In the above-mentioned implementation process, the rotation speeds of the first thinning roller, the second thinning roller and the third thinning roller increase successively. The first thinning roller and the third thinning roller have the same rotation direction, while the second thinning roller has a different rotation direction from the other two rollers. A shear effect can be formed between the two adjacent rollers, which is beneficial to the preparation of the positive electrode active layer.

[0016] In some embodiments, the laminating device further includes a waste conveying structure, and the waste conveying structure is disposed below the adsorption structure to convey the electrode sheet adsorbed by the adsorption structure.

[0017] In the above-mentioned implementation process, the adsorption structure adsorbs the positive electrode active layer located in the hollow part. When the adsorption structure rotates to the top of the waste conveying structure, the negative pressure is broken, and the adsorbed positive electrode active layer falls to the waste conveying structure under the action of gravity, thereby realizing the recovery of waste materials, which is beneficial to the subsequent coating structure when hot-coating the filling coating on the hollow part to ensure the uniformity of the thickness, and is beneficial to improving the static pressure treatment effect of the positive electrode sheet.

[0018] In some embodiments, the coating structure includes a dual-cavity die, a transfer roller and a heating module, the dual-cavity die is used to apply the filling coating to the transfer roller, the transfer roller is configured on one side of the intermittent electrode piece to apply the filling coating to the intermittent electrode piece, and the heating module is configured inside the transfer roller to heat the filling coating on the transfer roller.

[0019] In the above-mentioned implementation process, when the pole piece moves to the coating structure position, the double-cavity die head applies the filling coating to the transfer roller, and the heating module heats it to evaporate the solvent on the filling coating. Then, under the action of the transfer roller, it is transferred to the pole piece, and finally a pole piece structure with a filling coating of uniform thickness is prepared, which can solve the problems such as pole piece fracturing caused by coating height difference during isostatic pressing treatment of solid-state batteries.

[0020] In some embodiments, the coating device further includes a tension structure, which is disposed between the coating structure and the winding structure. The tension structure can provide tension to the pole piece structure between the coating structure and the winding structure, which is beneficial for the winding structure to wind up the pole piece structure, and can avoid wrinkles and the like in the pole piece structure during the winding process, thereby improving the performance of the pole piece structure.

[0021] 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.

[0022] 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

[0023] 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.

[0024] Figure 1 A schematic diagram of the structure of the positive electrode plate provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a structure in which a conductive coating of a positive electrode sheet structure provided in an embodiment of the present application is attached to a current collector;

[0026] Figure 3 A schematic diagram of the structure of the manufacturing equipment provided in the embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of the material device and the laminating device of the preparation equipment provided in the embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of a coating device of a preparation equipment provided in an embodiment of the present application.

[0029] Reference numerals

[0030] 10. Pole piece structure; 11. Current collector; 12. Hollow part; 13. Conductive coating; 14. Positive electrode active layer; 15. First coating; 16. Second coating; 20. Material device; 21. Blanking piece; 22. Dispersion roller; 23. First film-forming roller; 24. Second film-forming roller; 25. First thinning roller; 26. Second thinning roller; 27. Third thinning roller; 30. Laminating device; 31. Current collector unwinding structure; 32. Current collector conveying roller; 33. Trimming structure; 34. Adsorption structure; 35. Waste conveying structure; 40. Coating device; 41. Double-cavity die; 411. Die upper cavity; 412. Die lower cavity; 42. Transfer roller; 43. Heating module; 44. Tension structure; 45. Matching roller; 46. Winding structure. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example

[0037] 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.

[0038] During the design process, the inventors found that the high safety and high energy density advantages of all-solid-state batteries are prominent. Currently, power battery coating mostly uses wet coating. After the active material is evenly dispersed in the solvent, it is coated on the current collector by extrusion coating and other forms, and the electrode sheet is prepared after a baking process. However, the thickness of the all-solid-state positive electrode sheet is relatively thick, and traditional wet coating cannot solve the low baking efficiency and bulging edges caused by thick coating. It is necessary to use dry coating to make thick electrodes and laminate them to the current collector by thermal lamination, but the general dry electrode preparation method is continuous coating, which cannot meet the intermittent coating requirements of the safety coating of the solid positive electrode sheet.

[0039] In view of this, if Figure 1-Figure 2 As shown, in the first aspect, an embodiment of the present application provides a positive electrode pole piece structure 10, including: a current collector 11, which is provided with a coating surface, and the current collector 11 is configured to be distributed along a first direction; a conductive coating 13, which is configured to be distributed on the coating surface at intervals along the first direction, and the size of the conductive coating 13 is smaller than the size of the current collector 11 to form a cavity 12; a filling coating, which fills the cavity 12, and the thickness of the filling coating located in the cavity 12 is consistent.

[0040] Exemplarily, the conductive coatings 13 are configured in plurality, and the conductive coatings 13 are spaced apart on the coating surface along the first direction, wherein the centers of the conductive coatings 13 along the first direction are located on the same axis, and the spacing between two adjacent conductive coatings 13 is configured to be consistent.

[0041] In the above implementation process, the conductive coating 13 is attached to the current collector 11 to form a hollow portion 12, and the structural thickness of the filling coating filled in the hollow portion 12 is consistent, which can avoid the positive electrode sheet fracturing problem caused by the coating height difference during static pressing treatment of solid-state batteries, thereby improving the performance of the product.

[0042] In some embodiments, in the second direction, the size of the conductive coating 13 is smaller than the size of the current collector 11, wherein the first direction is perpendicular to the second direction; illustratively, the first direction includes but is not limited to the left-right direction, and the second direction includes but is not limited to the front-back direction.

[0043] In the above implementation process, by making the size of the conductive coating 13 smaller than the size of the current collector 11 along the first direction and the second direction, a hollow portion 12 is formed after the conductive coating 13 is attached to the current collector 11, which facilitates the filling of the coating in the hollow portion 12. At the same time, the conductive coating 13 can provide an electron conduction channel and bond the positive electrode active layer 14 under the action of pressure and temperature.

[0044] In some embodiments, the filling coating includes a first coating 15 , the first coating 15 is disposed between two adjacent conductive coatings 13 , and along the second direction, a size of the first coating 15 is consistent with a size of the conductive coating 13 .

[0045] In some embodiments, the filling coating further includes a second coating 16 , which is disposed on the coating surface and is located at the outer edge of the conductive coating 13 . In the first direction, the length of the second coating 16 is consistent with the length of the current collector 11 .

[0046] like Figure 2 As shown, the positive electrode sheet structure 10 further includes a positive electrode active layer 14, the positive electrode active layer 14 is located on the side of the conductive coating 13 away from the current collector 11, and the edge of the positive electrode active layer 14 is flush with the edge of the conductive coating 13; at the same time, in the actual coating process, after the positive electrode active layer 14 is attached to the conductive coating 13, the upper end of the positive electrode active layer 14 is flush with the upper end of the filling coating

[0047] like Figure 3-Figure 5As shown, in the second aspect, the present application also provides a manufacturing device, which is used to prepare a positive electrode pole piece structure 10, wherein the manufacturing device comprises: a material device 20, comprising a material structure, a film-forming structure and a thinning structure, the material structure is used to provide a fibrous powder to the film-forming structure, the film-forming structure is arranged on one side of the material structure, and is used to form a material film for the fibrous powder, and the thinning structure is arranged on one side of the film-forming structure, and is used to thin the material film to form a positive electrode active layer 14; a laminating device 30, comprising a current collecting structure, a trimming structure 33 and an adsorption structure 34, the current collecting structure is used to convey a conductive coating to the thinning structure. The current collector 11 has a layer 13, the trimming structure 33 is arranged on one side of the thinning structure, and is used to trim the positive electrode active layer 14, wherein the positive electrode active layer 14 after trimming is used to be thermally laminated with the conductive coating 13 to form a pole piece, and the adsorption structure 34 is arranged on the other side of the thinning structure, and is used to adsorb the pole piece to form an intermittent pole piece with a void portion 12; the coating device 40 includes a coating structure and a winding structure 46, the coating structure is arranged on one side of the adsorption structure 34, and is used to apply a filling coating to the void portion 12 to form a pole piece structure 10, and the winding structure 46 is used to wind up the pole piece structure 10.

[0048] Exemplarily, there are two material devices 20, which are symmetrically distributed and located on the same horizontal line, so that the positive electrode active layer 14 is attached to the conductive coating 13 between the two material devices 20, wherein the material structure includes a blanking piece 21 and a dispersion roller 22, and there are two dispersion rollers 22, which are distributed in the inner cavity of the blanking piece 21, so as to evenly drop the fiberized powder in the blanking piece 21 into the roller gap of the film-forming structure, that is, the dispersion roller 22 is used for roller conveying dry materials and quantitatively and evenly conveying the fiberized powder.

[0049] The film forming structure includes a first film forming roller 23 and a second film forming roller 24, the first film forming roller 23, the second film forming roller 24 and the thinning structure are located on the same horizontal line, and the first film forming roller 23 and the second film forming roller 24 are spaced apart, the rotation speed of the first film forming roller 23 is less than the rotation speed of the second film forming roller 24, the rotation speed of the second film forming roller 24 is less than the rotation speed of the first thinning roller 25 of the thinning structure, the rotation direction of the first film forming roller 23 is opposite to the rotation direction of the second film forming roller 24, the rotation direction of the first film forming roller 23 is consistent with the rotation direction of the first thinning roller 25, the distance between the first film forming roller 23 and the second film forming roller 24 is greater than the distance between the second film forming roller 24 and the first thinning roller 25, the roller temperature of the first film forming roller 23 and the second film forming roller 24 is in the range of 100-150°C, and the pressure is in the range of 5T-30T.

[0050] The current collecting structure includes a current collecting unwinding structure 31 and a current collecting conveying roller 32, wherein the current collecting unwinding structure 31 is used to convey the current collector 11 with a conductive coating 13 attached to the current collecting conveying roller 32, and then convey it to between the two thinning structures through the current collecting conveying roller 32, wherein the current collecting conveying roller 32 is configured with a plurality of current collecting conveying rollers 32, and the plurality of current collecting conveying rollers 32 are distributed at different positions, and can be used to adjust the tension of the current collector 11 with a conductive coating 13 attached to it; it should be noted that the current collector 11 with a conductive coating 13 wound by the current collecting unwinding structure 31 has the conductive coating 13 distributed at intervals on the current collector 11.

[0051] There are two trimming structures 33, which are located above the thinning structure and are used to cut the edge of the positive electrode active layer 14 before lamination, so that the width of the positive electrode active layer 14 is consistent with the width of the conductive coating 13. After the current collector 11 with the conductive coating 13 is attached passes through the two thinning structures, the positive electrode active layer 14 is thermally laminated to the conductive coating 13. The thermal lamination temperature of the positive electrode active layer 14 on the conductive coating 13 is 150℃-200℃, and the pressure is 5T-30T, so as to form the pole piece, that is, the pole piece includes the current collector 11, the conductive coating 13 and the positive electrode active layer 14.

[0052] The adsorption structures 34 are configured with two, and the two adsorption structures 34 are located below the thinning structure. When the pole piece has not passed through the adsorption structure 34, the positive electrode active layer 14 of the pole piece not only has a structure located at the conductive coating 13, but also has a structure located between two adjacent conductive coatings 13, that is, the positive electrode active layer 14 can cover the hollow part 12 formed by the two adjacent conductive coatings 13, and after being adsorbed by the adsorption structure 34, the positive electrode active layer 14 of the hollow part 12 can be adsorbed to form the intermittent pole piece, thereby facilitating the subsequent coating device 40 to fill the filling coating in the hollow part 12.

[0053] In the above-mentioned implementation process, the material structure uniformly transports the fiberized powder to the film-forming structure, and then thins it by the thinning structure to form a positive electrode active layer 14 with uniform thickness. The trimming structure 33 removes the edge wave material of the positive electrode active layer 14, and the current collecting structure transports the collector 11 with the conductive coating 13 attached to the position of the thinning structure, so that the positive electrode active layer 14 is thermally laminated on the conductive coating 13. Subsequently, the adsorption structure 34 adsorbs the positive electrode active layer 14 at the hollow part 12 formed when the conductive coating 13 is attached to the collector 11, thereby forming an intermittent pole piece with a hollow part 12. The coating device 40 coats the filling coating on the hollow part 12, and finally forms a pole piece structure 10 with a filling coating of uniform thickness, thereby solving the problem that the coating cannot be evenly coated, and solving the problem of pole piece fracturing caused by coating height difference during static pressing treatment of solid-state batteries.

[0054] like Figure 3-Figure 4 As shown, the thinning structure includes a first thinning roller 25, a second thinning roller 26 and a third thinning roller 27, the first thinning roller 25, the second thinning roller 26 and the third thinning roller 27 are located on the same horizontal line, the rotation speed of the first thinning roller 25 is less than the rotation speed of the second thinning roller 26, the rotation speed of the second thinning roller 26 is less than the rotation speed of the third thinning roller 27, and the first thinning roller 25 and the third thinning roller 27 have the same rotation direction, the second thinning roller 26 and the first thinning roller 25 have opposite rotation directions, the spacing between the first thinning roller 25 and the second thinning roller 26 is greater than the spacing between the second thinning roller 26 and the third thinning roller 27, the roller temperatures of the first thinning roller 25, the second thinning roller 26 and the third thinning roller 27 are in the range of 100-150°C, and the pressure is in the range of 5T-30T, and the space between the two third thinning rollers 27 is used to thermally laminate the positive electrode active layer 14 to the conductive coating 13.

[0055] In the above-mentioned implementation process, the rotation speeds of the first thinning roller 25, the second thinning roller 26 and the third thinning roller 27 are increased successively. The first thinning roller 25 and the third thinning roller 27 have the same rotation direction, while the second thinning roller 26 has a different rotation direction from the other two. A shear effect can be formed between the two adjacent rollers, which is beneficial to the preparation of the positive electrode active layer 14.

[0056] In some embodiments, the laminating device 30 further includes a waste conveying structure 35 , and the waste conveying structure 35 includes a waste conveying belt. The waste conveying structure 35 is disposed below the adsorption structure 34 to convey the electrode sheet adsorbed by the adsorption structure 34 .

[0057] In the above-mentioned implementation process, the adsorption structure 34 adsorbs the positive electrode active layer 14 located in the hollow part 12. When the adsorption structure 34 rotates to the top of the waste conveying structure 35, the negative pressure is broken, and the adsorbed positive electrode active layer 14 falls to the waste conveying structure 35 under the action of gravity, thereby realizing the recovery of waste. This is beneficial to the thickness uniformity of the subsequent coating structure when hot-coating the filling coating on the hollow part 12, and can solve the problem of pole piece fracturing caused by coating height difference during static pressing treatment of solid-state batteries.

[0058] like Figure 5 As shown, the coating structure includes a double-cavity die 41, a transfer roller 42 and a heating module 43. The double-cavity die 41 is used to apply the filling coating to the transfer roller 42. The transfer roller 42 is arranged on one side of the intermittent electrode to apply the filling coating to the intermittent electrode. The heating module 43 is arranged inside the transfer roller 42 to heat the filling coating on the transfer roller 42.

[0059] Exemplarily, the double-cavity die 41 includes an upper cavity 411 and a lower cavity 412 , wherein the upper cavity 411 is used for continuously coating the second coating 16 , and the lower cavity 412 is used for intermittently coating the first coating 15 .

[0060] It should be noted that when the filling coating of the pole piece structure 10 is not dry enough, the pole piece structure 10 may be subjected to an oven baking treatment.

[0061] There are two transfer rollers 42, and the rotation directions of the two transfer rollers 42 are opposite. One of the transfer rollers 42 is located above the intermittent pole piece, and the other transfer roller 42 is located below the intermittent pole piece. Each transfer roller 42 is configured with a mating roller 45, and the rotation directions of the transfer roller 42 and the mating roller 45 are opposite to each other, so that the intermittent pole piece is passed between the transfer roller 42 and the mating roller 45.

[0062] In the above-mentioned implementation process, when the pole piece moves to the coating structure position, the dual-cavity die head 41 applies the filling coating to the transfer roller 42, and the heating module 43 heats it to evaporate the solvent on the filling coating, and then transfers it to the pole piece under the action of the transfer roller 42, and finally prepares a pole piece structure 10 with a filling coating of uniform thickness, which can solve the problem of pole piece fracturing caused by coating height difference during isostatic pressing treatment of solid-state batteries.

[0063] In some embodiments, the coating device 40 further includes a tension structure 44, which includes but is not limited to a tension roller, and the tension roller is configured with at least one tension structure 44, and the tension structure 44 is configured between the coating structure and the winding structure 46. It is possible to provide tension to the pole piece structure 10 between the coating structure and the winding structure 46, which is conducive to the winding structure 46 to wind up the pole piece structure 10, and can avoid the pole piece structure 10 from wrinkling during the winding process, thereby improving the performance of the pole piece structure 10.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the 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 positive electrode plate structure, characterized in that: include: A current collector having a coating surface, wherein the current collector is arranged to be distributed along a first direction; A conductive coating layer is configured to be distributed on the coating surface at intervals along the first direction, and the size of the conductive coating layer is smaller than the size of the current collector to form a hollow portion; The filling coating fills the hollow portion, and the thickness of the filling coating located in the hollow portion is consistent.

2. The positive electrode plate structure according to claim 1, characterized in that: In a second direction, a size of the conductive coating is smaller than a size of the current collector, wherein the first direction is perpendicular to the second direction.

3. The positive electrode plate structure according to claim 2, characterized in that: The filling coating includes a first coating, which is disposed between two adjacent conductive coatings, and along the second direction, a size of the first coating is consistent with a size of the conductive coating.

4. The positive electrode plate structure according to claim 3, characterized in that: The filling coating also includes a second coating, which is disposed on the coating surface and is located at the outer edge of the conductive coating.

5. The positive electrode plate structure according to claim 1 or 4, characterized in that: The positive electrode sheet structure further includes a positive electrode active layer, which is located on a side of the conductive coating layer away from the current collector, and an edge of the positive electrode active layer is flush with an edge of the conductive coating layer.

6. A production device, characterized in that: The manufacturing equipment is used to prepare a positive electrode plate structure, wherein the manufacturing equipment comprises: A material device, comprising a material structure, a film-forming structure and a thinning structure, wherein the material structure is used to provide a fibrous powder to the film-forming structure, the film-forming structure is arranged on one side of the material structure to form a material film for the fibrous powder, and the thinning structure is arranged on one side of the film-forming structure to thin the material film to form a positive electrode active layer; A laminating device, comprising a current collecting structure, a trimming structure and an adsorption structure, wherein the current collecting structure is used to transport a current collector coated with a conductive coating to the thinning structure, the trimming structure is arranged on one side of the thinning structure, and is used to trim the positive electrode active layer, wherein the trimmed positive electrode active layer is used to be thermally laminated with the conductive coating to form a pole piece, and the adsorption structure is arranged on the other side of the thinning structure, and is used to adsorb the pole piece to form an intermittent pole piece with a hollow portion; The coating device comprises a coating structure and a winding structure. The coating structure is arranged on one side of the adsorption structure and is used to apply a filling coating to the hollow part to form a pole piece structure. The winding structure is used to wind up the pole piece structure.

7. The production equipment according to claim 6, characterized in that: The thinning structure includes a first thinning roller, a second thinning roller and a third thinning roller, the rotation speed of the first thinning roller is less than the rotation speed of the second thinning roller, the rotation speed of the second thinning roller is less than the rotation speed of the third thinning roller, and the first thinning roller and the third thinning roller have the same rotation direction, and the second thinning roller and the first thinning roller have an opposite rotation direction.

8. The production equipment according to claim 6, characterized in that: The laminating device further comprises a waste material conveying structure, and the waste material conveying structure is arranged below the adsorption structure to convey the electrode sheet adsorbed by the adsorption structure.

9. The production equipment according to claim 6, characterized in that: The coating structure includes a double-cavity die, a transfer roller and a heating module. The double-cavity die is used to apply the filling coating to the transfer roller. The transfer roller is arranged on one side of the intermittent electrode piece to apply the filling coating to the intermittent electrode piece. The heating module is arranged inside the transfer roller to heat the filling coating on the transfer roller.

10. The production equipment according to claim 6, characterized in that: The coating device further comprises a tension structure, and the tension structure is arranged between the coating structure and the winding structure.

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