Coating device and battery production line

Abstract

The utility model discloses a coating device and a battery production line, and the coating device comprises an unwinding mechanism which is used for releasing a base material to be coated; the first coating mechanism is arranged at the downstream of the unwinding mechanism and is used for coating the first surface of the base material; the second coating mechanism is arranged at the downstream of the first coating mechanism and is used for coating the second surface of the base material; the rolling mechanism is arranged at the downstream of the second coating mechanism and is used for rolling the coated base material; and the winding mechanism is arranged at the downstream of the rolling mechanism. According to the scheme provided by the invention, the first coating mechanism and the second coating mechanism are used for coating the first surface and the second surface of the base material to form the pole piece, and then the rolling mechanism is used for rolling the formed pole piece, so that a coating layer on the formed pole piece can be densified; furthermore, a pole piece with a flat surface and a densified interior can be prepared.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a coating device and a battery production line. Background Art

[0002] In the production process of lithium batteries, electrodes need to be coated by a coating machine.

[0003] During use, the coating machine in the related art cannot obtain a pole piece with a smooth surface and internal densification. Utility Model Content

[0004] In view of the above problems, the present application provides a coating device and a battery production line, which can solve the problem that the coating machine cannot obtain a smooth surface and internally densified electrode during use.

[0005] In order to solve the above technical problems, in the first aspect, the present application proposes a coating device, comprising:

[0006] An unwinding mechanism for releasing the substrate to be coated;

[0007] A first coating mechanism, disposed downstream of the unwinding mechanism, for coating a first surface of the substrate;

[0008] A second coating mechanism, disposed downstream of the first coating mechanism, for coating the second side of the substrate;

[0009] A rolling mechanism, disposed downstream of the second coating mechanism, for rolling the coated substrate;

[0010] A winding mechanism, arranged downstream of the rolling mechanism;

[0011] The first detection member is arranged downstream of the rolling mechanism and is used to detect the thickness of the substrate after rolling.

[0012] In the technical solution of the embodiment of the present application, the first coating mechanism and the second coating mechanism are used to coat the first surface and the second surface of the substrate to form a pole piece, and then the formed pole piece is rolled by the rolling mechanism, so that the coating layer on the formed pole piece can be densified, and then a pole piece with a flat surface and internal densification can be prepared. At the same time, the first detection member is provided to facilitate the detection of the thickness of the substrate after rolling.

[0013] In some embodiments, the rolling mechanism includes a first rolling roller and a second rolling roller, and the first rolling roller and the second rolling roller are arranged opposite to each other. In this way, the coated substrate can be rolled by the cooperation of the first rolling roller and the second rolling roller.

[0014] In some embodiments, the distance between the first pressing roller and the second pressing roller is adjustable. Thus, by adjusting the distance between the first pressing roller and the second pressing roller, the pressure of the roller pressing on the substrate can be adjusted.

[0015] In some embodiments, the coating device further comprises a tab extension mechanism, and the tab extension mechanism is located upstream of the rolling mechanism. In this way, the tab extension mechanism can extend the tab region of the pole sheet before rolling.

[0016] In some embodiments, the coating device further comprises a tension control mechanism, and the tension control mechanism is located upstream of the tab extension mechanism. In this way, the tension of the pole sheet before rolling can be controlled by the tension control mechanism.

[0017] In some embodiments, the coating device further comprises a first controller, the tab extension mechanism comprises a first heater, and the first controller is electrically connected to the first heater, so as to facilitate the control of the first heater.

[0018] In some embodiments, the coating device further comprises a first oven, and the first oven is disposed between the first coating mechanism and the second coating mechanism. Thus, the active material on the first side of the coated substrate can be dried by the first oven.

[0019] In some embodiments, the coating device further comprises a second detection member, which is disposed downstream of the first oven and is used to detect the weight of the substrate after drying. In this way, it is convenient to detect the weight of the substrate after drying.

[0020] In some embodiments, the coating device further comprises a second oven, which is disposed downstream of the second coating mechanism, so that the active material on the second side of the coated substrate can be dried by the second oven.

[0021] In some embodiments, the coating device further comprises a third detection member, which is disposed downstream of the second oven and is used to detect the weight of the substrate after drying. In this way, it is convenient to detect the weight of the substrate after drying.

[0022] In some embodiments, the coating device further comprises a second controller, the second oven comprises a second heater, and the second controller is electrically connected to the second heater, so as to facilitate the control of the second heater.

[0023] In some embodiments, the coating device further includes a first roll-changing mechanism, and / or the coating device further includes a second roll-changing mechanism;

[0024] The first roll-changing mechanism is arranged on the unwinding mechanism, and the second roll-changing mechanism is arranged on the rewinding mechanism. In this way, when the substrate on the unwinding roller on the unwinding mechanism is completely released, the first roll-changing mechanism can be used to place another unwinding roller at a designated position, so that the whole device can work uninterruptedly. When the substrate wound by the rewinding roller on the rewinding mechanism is saturated, the second roll-changing mechanism can be used to place another rewinding roller at a designated position, so that the whole device can work uninterruptedly.

[0025] In some embodiments, the first roll changing mechanism is an automatic roll changing mechanism, and / or the second roll changing mechanism is an automatic roll changing mechanism. In this way, it is convenient to replace the unwinding roller on the unwinding mechanism, and / or it is convenient to replace the winding roller on the winding mechanism.

[0026] In some embodiments, the coating device further includes a first deviation correction mechanism, and / or the coating device further includes a second deviation correction mechanism;

[0027] The first deviation-correcting mechanism is arranged downstream of the unwinding mechanism, and the second deviation-correcting mechanism is arranged upstream of the rewinding mechanism.

[0028] In a second aspect, the present application proposes a battery production line, comprising a coating device as described in any one of the embodiments of the present application.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0031] Figure 1 A schematic diagram of the structure of an electric device provided in some embodiments of the present application;

[0032] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0033] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0034] Figure 4 A schematic diagram of the structure of a coating device provided in some embodiments of the present application;

[0035] Figure 5 A schematic diagram of a pole piece structure provided in some embodiments of the present application;

[0036] Figure 6 A schematic diagram of a multi-layer composite pole piece structure provided in some embodiments of the present application;

[0037] Figure 7 A schematic diagram of a battery cell structure provided for some embodiments of the present application.

[0038] The reference numerals in the specific implementation manner are as follows:

[0039] 1000. Vehicles;

[0040] 100, battery; 200, controller; 300, motor;

[0041] 110, box body; 111, first part; 112, second part; 120, battery cell; 121, shell; 122, end cover; 123, electrode assembly;

[0042] 11. Unwinding mechanism; 12. First reversing roller; 13. First coating mechanism; 14. First roller; 15. First oven; 16. Second reversing roller; 17. Second coating mechanism; 18. Second roller; 19. Third roller; 20. Second oven; 21. Tension control mechanism; 211. First adjusting roller; 212. Second adjusting roller; 213. Third adjusting roller; 22. Rolling mechanism; 221. First rolling roller; 222. Second rolling roller; 23. Winding mechanism; 24. Substrate; 25. Rolling front pole piece; 26. Rolling rear pole piece; 27. Multilayer composite pole piece; 28. Rolling front battery cell; 29. ​​Rolling rear battery cell. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] 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.

[0052] Coating is to apply a thin layer of coating material in liquid or powder form on the surface of fabrics, paper, metal foil or plates. In order to improve the electrical performance and safety performance of lithium-ion batteries, coating is an indispensable step in the production process of battery cells, and it is also a key process that directly affects the safety, capacity, life and other performance of batteries. In the production process of battery cells, the positive active material is coated on the positive current collector, and the negative active material is coated on the negative current collector by the coating process, that is, the prepared paste-like viscous slurry (positive active material or negative active material) is evenly, continuously or intermittently coated on the substrate (positive current collector or negative current collector).

[0053] In the related art, the electrode manufacturing equipment usually includes an unwinding mechanism, two coating mechanisms and a winding mechanism, which are arranged in sequence along the conveying direction of the substrate. Among them, the unwinding mechanism releases the substrate, one coating mechanism coats the active material on the first side of the substrate, and the other coating mechanism coats the active material on the second side of the substrate and then winds it onto the winding mechanism.

[0054] In the above-mentioned electrode manufacturing equipment, after the active material is coated on the second side of the substrate to form the electrode, since the overall equipment does not roll the formed electrode, this will cause the surface of the electrode to be uneven and the active material on the electrode to be loose, making it impossible to obtain a electrode with a smooth surface and dense interior.

[0055] Based on the above considerations, in order to solve the problem that the coating machine cannot obtain a smooth surface and internally densified electrode during use, a coating device is designed, which includes: an unwinding mechanism, a first coating mechanism, a second coating mechanism, a rolling mechanism, a winding mechanism and a first detection member, wherein the unwinding mechanism is used to release the substrate to be coated; the first coating mechanism is arranged downstream of the unwinding mechanism, and is used to coat the first side of the substrate; the second coating mechanism is arranged downstream of the first coating mechanism, and is used to coat the second side of the substrate; the rolling mechanism is arranged downstream of the second coating mechanism, and is used to roll the coated substrate; the winding mechanism is arranged downstream of the rolling mechanism. The first detection member is arranged downstream of the rolling mechanism, and is used to detect the thickness of the substrate after rolling.

[0056] When in use, the first coating mechanism and the second coating mechanism are used to coat the first surface and the second surface of the substrate to form a pole piece, and then the formed pole piece is rolled by the rolling mechanism, so that the coating layer on the formed pole piece can be densified, and then a pole piece with a flat surface and internal densification can be prepared. At the same time, the first detection member is provided to facilitate the detection of the thickness of the substrate after rolling.

[0057] The coating device disclosed in the embodiment of the present application can be used, but is not limited to, in the production of battery pole pieces. It should be noted that the battery in the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery pack, etc. The battery can be used as a power source or power system for an electrical device, which is conducive to improving the overall performance of the battery and facilitating the promotion of the battery.

[0058] The above-mentioned electrical devices may be, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 110 and a battery cell 120, and the battery cell 120 is contained in the box body 110. Among them, the box body 110 is used to provide a storage space for the battery cell 120, and the box body 110 can adopt a variety of structures. In some embodiments, the box body 110 may include a first part 111 and a second part 112, and the first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a storage space for accommodating the battery cell 120. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure, and the first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 jointly define a storage space; the first part 111 and the second part 112 may also be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box body 110 formed by the first part 111 and the second part 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery 100, there may be multiple battery cells 120, and the multiple battery cells 120 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 120 are both connected in series and in parallel. The multiple battery cells 120 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 120 is accommodated in the box 110; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 120 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 110. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 120.

[0064] Each battery cell 120 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 may be cylindrical, flat, rectangular, or in other shapes.

[0065] like Figure 3 As shown, the battery cell 120 may include a housing, an electrode assembly 123 and an electrode terminal. The housing includes a shell 121 and an end cap 122. The shell 121 has an opening, and the end cap 122 closes the opening to isolate the internal environment of the battery cell 120 from the external environment.

[0066] The shell 121 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the electrode assembly 123, the electrolyte and other components. The shell 121 and the end cap 122 can be independent components. The shell 121 can be of various shapes and sizes. Specifically, the shape of the shell 121 can be determined according to the specific shape and size of the electrode assembly 123. The material of the shell 121 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0067] The end cap 122 refers to a component that covers the opening of the shell 121 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 122 can be adapted to the shape of the shell 121 to match the shell 121. Optionally, the end cap 122 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 122 is not easily deformed when squeezed and collided, so that the battery cell 120 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 122. The electrode terminal can be used to electrically connect to the electrode assembly 123 for outputting or inputting electrical energy of the battery cell 120. The material of the end cap 122 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 122, and the insulating structure may be used to isolate the electrical connection components in the housing 121 from the end cap 122 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0068] The electrode assembly 123 is a component in the battery cell 120 where an electrochemical reaction occurs. One or more electrode assemblies 123 may be included in the housing 121. The electrode assembly 123 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 123, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear. The positive pole ear and the negative pole ear may be located at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the pole ear connects the electrode terminal to form a current loop. In addition, the electrode assembly 123 may be a winding structure or a laminated structure.

[0069] In some embodiments, the battery cell 120 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold value.

[0070] According to some embodiments of the present application, Figure 4 Schematic diagram of the coating device in this application. Figure 4 As shown, the present application provides a coating device, which includes an unwinding mechanism 11, a first coating mechanism 13, a second coating mechanism 17, a rolling mechanism 22, a winding mechanism 23 and a first detection member, wherein the unwinding mechanism 11 is used to release the substrate 24 to be coated; the first coating mechanism 13 is arranged downstream of the unwinding mechanism 11, and is used to coat the first side of the substrate 24; the second coating mechanism 17 is arranged downstream of the first coating mechanism 13, and is used to coat the second side of the substrate 24; the rolling mechanism 22 is arranged downstream of the second coating mechanism 17, and is used to roll the coated substrate 24; the winding mechanism 23 is arranged downstream of the rolling mechanism 22; the first detection member is arranged downstream of the rolling mechanism 22, and is used to detect the thickness of the substrate after rolling.

[0071] refer to Figure 4 As shown, the coating device in this embodiment further includes a first reversing roller 12, a first roller 14, a second reversing roller 16, a second roller 18, a third roller 19 and a frame (marked in the figure). The first reversing roller 12, the first roller 14, the second reversing roller 16, the second roller 18, and the third roller 19 are connected to the frame in rotation in sequence along the tape-feeding direction of the substrate 24. The first roller 14 corresponds to the position of the first coating mechanism 13, and the second roller 18 corresponds to the position of the second coating mechanism 17.

[0072] The unwinding mechanism 11 may include an unwinding roller and a motor. The two ends of the unwinding roller are connected to the frame through a rotating shaft. The motor is fixed to the frame, and the output shaft of the motor is connected to the rotating shaft on the unwinding roller. The unwinding roller can release the substrate 24 to be coated by driving the rotating shaft to rotate by the motor. Of course, it can be understood that the unwinding mechanism 11 in this embodiment can also be other structures, for example: the unwinding mechanism 11 includes an unwinding roller, a transmission gear and a motor, and the specific structure can be determined according to actual conditions, and the embodiments of this specification are not limited to this.

[0073] The substrate 24 on the unwinding mechanism 11 in this embodiment can be a coated substrate with good conductivity, such as copper foil, aluminum foil, stainless steel, etc. The specific substrate can be determined according to actual conditions, and this embodiment of the specification does not limit this.

[0074] The substrates 24 in this embodiment are all regular structures. The first and second surfaces of the substrates 24 of common regular shapes are opposite to each other, and along the width direction of the substrate 24, the two edges of the first surface and the two edges of the second surface are projected to coincide with each other. In the case of a special-shaped substrate, the first and second surfaces may be staggered.

[0075] The first coating mechanism 13 and the second coating mechanism 17 are used to coat the active material on the first side and the second side of the substrate 24. The active material includes at least one of lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel oxide, lithium nickel manganese oxide and lithium nickel iron manganese oxide. The active material is divided into positive electrode active material and negative electrode active material, that is, the positive electrode active material is used in the active material slurry of the positive electrode sheet, and the negative electrode active material is used in the active material slurry of the negative electrode sheet.

[0076] In this embodiment, the first coating mechanism 13 and the second coating mechanism 17 may be an extrusion coater, a micro-gravure coater, etc., which may be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0077] The rolling mechanism 22 in this embodiment may include two rollers arranged opposite to each other, both rollers are rotatably connected to the frame, and one of the rollers is connected to a motor, which can drive the roller to rotate. A gap is left between the two rollers, and the gap allows the coated substrate to pass through. Of course, it is understood that the rolling mechanism 22 can also be other structures, which can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0078] The winding mechanism 23 in this embodiment may include a winding roller and a motor, the two ends of the winding roller are connected to the frame through a rotating shaft, the motor is fixed to the frame, and the output shaft of the motor is connected to the rotating shaft on the winding roller. By driving the rotating shaft to rotate by the motor, the coated substrate can enter the winding roller to form a coil. Of course, it can be understood that the winding mechanism 23 in this embodiment can also be other structures, for example: the winding mechanism 23 includes a winding roller, a transmission gear and a motor, and the specific structure can be determined according to actual conditions, and this specification embodiment does not limit this.

[0079] The first detection member in the present embodiment may be a thickness detection sensor, a thickness measuring instrument, etc., which may be specifically determined according to actual conditions, and the present specification does not limit this.

[0080] In this embodiment, a first detection member is arranged downstream of the rolling mechanism 22, so that the thickness of the electrode sheet after rolling can be easily detected.

[0081] When in use, after the unwinding mechanism 11 releases the substrate 24, the substrate 24 will sequentially pass through the first reversing roller 12, the first roller 14, the second reversing roller 16, the second roller 18, the third roller 19, the rolling mechanism 22 and the winding mechanism 23. When the substrate 24 passes through the first roller 14, the first coating mechanism 13 will coat the first surface of the substrate 24; when the substrate 24 passes through the second roller 18, the second coating mechanism 17 will coat the second surface of the substrate 24; when the substrate 24 passes through the rolling mechanism 22, the formed pole piece will be rolled and finally wound onto the winding mechanism 23.

[0082] refer to Figure 5 , Figure 6 and Figure 7 As shown, Figure 5 It is a schematic diagram of the pole piece structure in this application; Figure 6 This is a schematic diagram of the multi-layer composite pole piece structure in this application; Figure 7 This is a schematic diagram of the battery cell structure in this application.

[0083] from Figure 5 It can be seen that the surface of the electrode sheet 25 before rolling is obviously uneven, and the surface of the electrode sheet 26 after rolling is flat. In this embodiment, the electrode sheet 25 before rolling includes an anode and an electrolyte, or a cathode and an electrolyte, or a structure such as Figure 6 The multi-layer composite pole piece 27 structure includes an anode, an electrolyte and a cathode. The thickness tolerance of the pole piece in the pole piece 26 structure after rolling is ±1μm. At this time, the active material on the pole piece is densified, and the conductive network and gram capacity can function normally. Figure 7 It can be seen that the electrolyte layer in the middle of the battery cell 28 structure is obviously uneven before rolling, and the electrolyte layer in the middle of the battery cell 29 structure is obviously flat after rolling.

[0084] In the technical solution of the embodiment of the present application, the first coating mechanism 13 and the second coating mechanism 17 are used to coat the first surface and the second surface of the substrate 24 to form a pole piece, and then the formed pole piece is rolled by the rolling mechanism 22, so that the coating layer on the formed pole piece can be densified, and then a pole piece with a flat surface and internal densification can be prepared. At the same time, the first detection member is provided to facilitate the detection of the thickness of the substrate after rolling.

[0085] According to some embodiments of the present application, Figure 4 As shown, the rolling mechanism 22 includes a first rolling roller 221 and a second rolling roller 222 , wherein the first rolling roller 221 and the second rolling roller 222 are arranged opposite to each other.

[0086] In this embodiment, the first pressing roller 221 and the second pressing roller 222 are both rotatably connected to the frame. At the same time, the first pressing roller 221 is connected to a motor, which is fixed to the frame and can drive the first pressing roller 221 to rotate. In addition, there is a gap between the first pressing roller 221 and the second pressing roller 222. When the second surface of the substrate 24 is coated to form a pole piece, the formed pole piece passes through the gap between the first pressing roller 221 and the second pressing roller 222 and is wound onto the winding mechanism 23.

[0087] When the pole piece passes between the first pressing roller 221 and the second pressing roller 222, the first pressing roller 221 and the second pressing roller 222 can roll the active material on the pole piece, so that the coating layer formed on the pole piece is densified, and then a pole piece with a smooth surface and internal densification can be prepared.

[0088] According to some embodiments of the present application, the distance between the first pressing roller 221 and the second pressing roller 222 is adjustable.

[0089] In this embodiment, long holes can be set on the frame in the up and down directions. By fixing the first roller 221 and the second roller 222 in the long holes at different positions, the distance between the first roller 221 and the second roller 222 can be conveniently adjusted. Of course, it can be understood that the first roller 221 and the second roller 222 can also be connected to the frame through an electric telescopic rod. The specific distance can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0090] This embodiment adjusts the distance between the first pressing roller 221 and the second pressing roller 222. For example, when the distance between the first pressing roller 221 and the second pressing roller 222 increases, the pressure acting on the pole piece when the pole piece passes between the first pressing roller 221 and the second pressing roller 222 is small; when the distance between the first pressing roller 221 and the second pressing roller 222 decreases, the pressure acting on the pole piece when the pole piece passes between the first pressing roller 221 and the second pressing roller 222 is large.

[0091] In this way, by adjusting the distance between the first pressing roller 221 and the second pressing roller 222 , the pressure of the roller pressing on the pole piece can be adjusted.

[0092] According to some embodiments of the present application, the coating device further includes a tab extension mechanism, which is located upstream of the rolling mechanism 22 .

[0093] The pole tab extension mechanism in this embodiment may be a non-contact magnetic induction heating mechanism, which heats the foil material in the pole tab region of the pole piece by electromagnetic induction, thereby improving the ductility of the pole tab region.

[0094] Of course, it is understandable that the tab extension mechanism can also be an induction heating probe, etc. The specific one can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0095] According to some embodiments of the present application, Figure 4 As shown, the coating device further comprises a tension control mechanism 21, which is located upstream of the tab extension mechanism.

[0096] refer to Figure 4As shown, the tension control mechanism 21 includes a first adjustment roller 211, a second adjustment roller 212 and a third adjustment roller 213, which are all rotatably connected to the frame, and the first adjustment roller 211 and the second adjustment roller 212 are arranged in sequence along the tape-feeding direction of the substrate, and the third adjustment roller 213 is located between the first adjustment roller 211 and the second adjustment roller 212, and the third adjustment roller 213 is located below the first adjustment roller 211 and the second adjustment roller 212. Of course, it can be understood that the tension control mechanism 21 can also be other structures, which can be determined according to actual conditions, and the embodiments of this specification do not limit this.

[0097] After the second surface of the substrate 24 is coated to form a pole piece, the pole piece passes through the first adjusting roller 211 , the third adjusting roller 213 and the second adjusting roller 212 in sequence and then enters the rolling mechanism 22 .

[0098] When in use, the third adjusting roller 213 is installed at different positions on the frame so that the distance between the third adjusting roller 213 and the first adjusting roller 211 is increased or decreased, thereby controlling the tension of the pole piece before rolling.

[0099] According to some embodiments of the present application, the coating device further includes a first controller, the tab extension mechanism includes a first heater, and the first controller is electrically connected to the first heater.

[0100] The first controller in this embodiment can be a PLC controller, a touch controller, etc. The specific one can be determined according to actual conditions, and this specification embodiment does not limit this.

[0101] When in use, the first heater can be conveniently controlled to be turned on or off through the first controller.

[0102] According to some embodiments of the present application, Figure 4 As shown, the coating device further includes a first oven 15 , which is disposed between the first coating mechanism 13 and the second coating mechanism 17 .

[0103] The first drying oven 15 in the present embodiment can be a convection drying oven, an infrared drying oven, a magnetic induction heating oven, etc. The specific one can be determined according to the actual situation, and the present specification embodiment does not limit this.

[0104] After the first surface of the substrate 24 is coated by the first coating mechanism 13, the coated substrate 24 enters the first oven 15 and then enters the second coating mechanism 17. In this way, the active material on the substrate 24 coated by the first coating mechanism 13 can be dried by the first oven 15.

[0105] According to some embodiments of the present application, the coating device further includes a second detection member, which is disposed downstream of the first oven 15 and is used to detect the weight of the substrate after drying.

[0106] The second detection component in this embodiment can be a weight sensor, a weight measuring instrument, etc., which can be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0107] In this embodiment, a second detection element is arranged downstream of the first oven 15, so that the weight of the substrate after drying can be conveniently detected.

[0108] According to some embodiments of the present application, Figure 4 As shown, the coating device further includes a second oven 20 , which is disposed downstream of the second coating mechanism 17 .

[0109] The second drying oven 20 in the present embodiment can be a convection drying oven, an infrared drying oven, a magnetic induction heating oven, etc. The specific one can be determined according to the actual situation, and the present specification embodiment does not limit this.

[0110] After the second surface of the substrate 24 is coated by the second coating mechanism 17, the coated substrate 24 enters the second oven 20 and then enters the roller pressing mechanism. In this way, the active material on the substrate 24 coated by the second coating mechanism 17 can be dried by the second oven 20.

[0111] According to some embodiments of the present application, the coating device further includes a third detection member, which is disposed downstream of the second oven 20 and is used to detect the weight of the substrate after drying.

[0112] The third detection component in this embodiment can be a weight sensor, a weight measuring instrument, etc., which can be specifically determined according to actual conditions, and the embodiments of this specification do not limit this.

[0113] In this embodiment, a third detection element is arranged downstream of the second oven 20, so that the weight of the substrate after drying can be conveniently detected.

[0114] According to some embodiments of the present application, the coating device further includes a second controller, the second oven 20 includes a second heater, and the second controller is electrically connected to the second heater.

[0115] The second controller in this embodiment can be a PLC controller, a touch controller, etc. The specific one can be determined according to actual conditions, and this specification embodiment does not limit this.

[0116] When in use, the second heater can be conveniently turned on or off by the second controller.

[0117] According to some embodiments of the present application, the coating device further includes a first roll changing mechanism, and / or the coating device further includes a second roll changing mechanism, wherein the first roll changing mechanism is arranged on the unwinding mechanism 11 and the second roll changing mechanism is arranged on the rewinding mechanism 23.

[0118] For the convenience of description, the following description is made by taking the coating device including the first roll changing mechanism and the second roll changing mechanism as an example.

[0119] The first roll changing mechanism and the second roll changing mechanism in this embodiment can both refer to the existing roll changing mechanism, and will not be described in detail here.

[0120] In this embodiment, by setting up a first roll-changing mechanism, when the substrate on the unwinding roller of the unwinding mechanism is released, the first roll-changing mechanism can be used to place another unwinding roller at a specified position, so that the entire device can work uninterruptedly.

[0121] When the substrate wound by the winding roller on the winding mechanism is saturated, the second winding mechanism can be used to place another winding roller at a specified position so that the entire device can work uninterruptedly.

[0122] According to some embodiments of the present application, the first roll changing mechanism is an automatic roll changing mechanism, and / or the second roll changing mechanism is an automatic roll changing mechanism.

[0123] For the convenience of description, the following description is given by taking the first roll changing mechanism and the second roll changing mechanism as an example where both the first roll changing mechanism and the second roll changing mechanism are automatic roll changing mechanisms.

[0124] The automatic roll changing mechanism in this embodiment can refer to the existing automatic roll changing mechanism, which will not be described in detail here.

[0125] This embodiment provides an automatic roll-changing mechanism, thereby facilitating the replacement of the unwinding roller on the unwinding mechanism, and at the same time, facilitating the replacement of the winding roller on the winding mechanism.

[0126] According to some embodiments of the present application, the coating device also includes a first correcting mechanism, and / or the coating device also includes a second correcting mechanism, wherein the first correcting mechanism is arranged downstream of the unwinding mechanism 11 and the second correcting mechanism is arranged upstream of the winding mechanism 23.

[0127] For the convenience of description, the following description is made by taking the coating device including the first deviation correcting mechanism and the second deviation correcting mechanism as an example.

[0128] The first deviation-correcting mechanism and the second deviation-correcting mechanism in this embodiment can both refer to the existing pole piece deviation-correcting mechanism, and will not be described in detail here.

[0129] In this embodiment, the first deflection correction mechanism is arranged downstream of the unwinding mechanism 11, so that the error of the substrate during the unwinding process can be controlled. The second deflection correction mechanism is arranged upstream of the rewinding mechanism 23, so that the error during the rewinding process can be controlled.

[0130] The present application also provides a battery production line, comprising a coating device as described in any one of the embodiments of the present application.

[0131] The specific structure of the coating device in this embodiment refers to the above embodiment. Since all the technical solutions of all the above embodiments are adopted in the battery production line, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device, characterized in that: include: An unwinding mechanism for releasing the substrate to be coated; A first coating mechanism, disposed downstream of the unwinding mechanism, for coating a first surface of the substrate; A second coating mechanism, disposed downstream of the first coating mechanism, for coating the second side of the substrate; A rolling mechanism, disposed downstream of the second coating mechanism, for rolling the coated substrate; A winding mechanism, arranged downstream of the rolling mechanism; A first detection member, which is disposed downstream of the rolling mechanism and is used to detect the thickness of the substrate after rolling; A tab extension mechanism, wherein the tab extension mechanism is located upstream of the rolling mechanism.

2. The coating device according to claim 1, characterized in that: The rolling mechanism comprises a first rolling roller and a second rolling roller, and the first rolling roller and the second rolling roller are arranged opposite to each other.

3. The coating device according to claim 2, characterized in that: The distance between the first pressing roller and the second pressing roller is adjustable.

4. The coating device according to claim 1, characterized in that: The coating device further comprises a tension control mechanism, and the tension control mechanism is located upstream of the tab extension mechanism.

5. The coating device according to claim 1, characterized in that: The coating device further includes a first controller, the tab extension mechanism includes a first heater, and the first controller is electrically connected to the first heater.

6. The coating device according to claim 1, characterized in that: The coating device further includes a first oven, and the first oven is disposed between the first coating mechanism and the second coating mechanism.

7. The coating device according to claim 6, characterized in that: The coating device further comprises a second detection member, which is arranged downstream of the first oven and is used to detect the weight of the substrate after drying.

8. The coating device according to claim 6, characterized in that: The coating device further comprises a second oven, and the second oven is arranged downstream of the second coating mechanism.

9. The coating device according to claim 8, characterized in that: The coating device further comprises a third detection member, which is disposed downstream of the second oven and is used to detect the weight of the substrate after drying.

10. The coating device according to claim 8, characterized in that: The coating device further includes a second controller, the second oven includes a second heater, and the second controller is electrically connected to the second heater.

11. The coating device according to claim 1, characterized in that: The coating device further comprises a first roll-changing mechanism, and / or the coating device further comprises a second roll-changing mechanism; The first roll-changing mechanism is arranged on the unwinding mechanism, and the second roll-changing mechanism is arranged on the rewinding mechanism.

12. The coating device according to claim 11, characterized in that: The first roll changing mechanism is an automatic roll changing mechanism, and / or, The second roll changing mechanism is an automatic roll changing mechanism.

13. The coating device according to claim 1, characterized in that: The coating device further comprises a first deviation correcting mechanism, and / or the coating device further comprises a second deviation correcting mechanism; The first deviation-correcting mechanism is arranged downstream of the unwinding mechanism, and the second deviation-correcting mechanism is arranged upstream of the rewinding mechanism.

14. A battery production line, characterized in that: Comprising a coating device as described in any one of claims 1 to 13.

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