Powder spraying device and powder spraying type dry method electrode manufacturing equipment

Abstract

The utility model is suitable for the technical field of battery manufacturing, and provides a powder spraying device and powder spraying type dry method electrode manufacturing equipment. The powder spraying device comprises electrostatic spraying equipment and pre-curing powder spreading equipment. The electrostatic spraying equipment comprises a negative pressure control assembly, a spraying platform, at least one electrostatic spraying assembly, a moving assembly, a recycling assembly and a supporting assembly. The electrostatic spraying assembly is used for spraying an electrode powder material to a current collector, the moving assembly comprises a horizontal moving unit and a vertical moving unit, the horizontal moving unit is used for driving the electrostatic spraying assembly to move in the horizontal direction, and the vertical moving unit is used for driving the electrostatic spraying assembly to move in the vertical direction; and the pre-curing powder spreading equipment and the electrostatic spraying equipment are connected in sequence. After electrostatic spraying, the current collector sprayed with the electrode powder material is heated and rolled by using the pre-curing powder spreading equipment, so that the electrode powder material on the current collector is uniform in component and consistent in thickness, and the stable performance of the battery is further ensured.

Description

Technical Field

[0001] The present application belongs to the technical field of battery manufacturing, and in particular relates to a powder spraying device and powder spraying dry electrode manufacturing equipment. Background Art

[0002] Lithium-ion batteries have been widely used in portable electronic products such as mobile phones and computers, as well as electric vehicles, due to their high energy density, excellent cycle performance and long service life. These advantages make lithium-ion batteries an ideal source of power for these devices, meeting the needs of modern society for high efficiency, environmental protection and portability.

[0003] Traditional lithium-ion batteries are often mass-produced using a wet electrode manufacturing process to manufacture electrodes. During the manufacturing process, N-methylpyrrolidone solvent is required for homogenization and then drying. N-methylpyrrolidone solvent is toxic and corrosive, and there is a risk of affecting human health. Drying the solvent consumes a lot of energy, increasing the cost of electrode manufacturing.

[0004] Moreover, when lithium-ion batteries use sulfide solid electrolytes, since sulfide solid electrolytes are sensitive to water and polar organic solvents, they are affected by solvents during manufacturing, resulting in the destruction of the crystal structure and a decrease in lithium ion conductivity. In addition, during the drying process, the binder and the conductive agent will float on the surface and agglomerate due to capillary action and diffusion, which may cause the active material to precipitate, thereby causing electrode stratification. This stratification phenomenon will make the electrode easy to crack and reduce its structural stability.

[0005] At present, there are some dry electrode manufacturing processes, which use electrostatic spraying to spray electrode powder materials (including binders, conductive agents and active materials) onto the surface of the current collector, and then heat and roll to obtain electrodes. By using the dry electrode manufacturing process, the problems caused by the use of solvents in the wet electrode manufacturing process can be solved.

[0006] However, when using the electrostatic spraying process, the uniformity of the prepared electrode varies due to differences in material morphology, particle size, electrostatic response, etc., making it difficult to obtain the desired thickness and battery performance. Therefore, there is an urgent need for a powder spraying device that can produce uniform composition, consistent thickness, and stable battery performance. Utility Model Content

[0007] The embodiments of the present application provide a powder spraying device and powder spraying dry electrode manufacturing equipment, which can further pre-cure and spread the electrode material powder sprayed on the current collector after electrostatic spraying to make its thickness uniform. The manufactured electrodes have uniform composition, consistent thickness, stable battery performance, and can be quickly mass-produced.

[0008] In the first aspect, the embodiment of the present application provides a powder spraying device, including: an electrostatic spraying device and a pre-curing powder spreading device; the electrostatic spraying device includes a negative pressure control component, a spraying platform, at least one electrostatic spraying component, a moving component, a recovery component and a supporting component; the negative pressure control component includes a negative pressure box and an air suction unit, the spraying platform is arranged at the bottom center of the negative pressure box, the electrostatic spraying component is connected to the moving component and is arranged at the top of the negative pressure box, the electrostatic spraying component is arranged opposite to the spraying platform, and the spraying platform is used to carry the current collector; the electrostatic spraying component is used to spray the electrode powder material onto the current collector, and the electrostatic spraying component includes a powder supply barrel, a powder suction pipeline, an electrostatic powder spraying gun, and an air compressor. and a controller; the powder supply barrel is connected to the electrostatic powder spray gun through a powder suction pipeline, the electrostatic powder spray gun is connected to the air compressor through an air pipe, and the controller is electrically connected to the electrostatic powder spray gun and the air compressor; the moving component includes a horizontal moving unit and a vertical moving unit, the horizontal moving unit is used to drive the electrostatic spraying component to move in the horizontal direction, and the vertical moving unit is used to drive the electrostatic spraying component to move in the vertical direction; the negative pressure box is arranged on the supporting component, the recovery component is arranged in the supporting component, the recovery component is connected to the bottom of the negative pressure box, and the suction unit is arranged at the connecting point; the pre-curing powder spreading equipment and the spraying equipment are connected in sequence, and the pre-curing powder spreading equipment is used to roll and flatten the collector that has been sprayed with electrode powder material.

[0009] In some possible implementations, the horizontal moving unit includes a horizontal guide rail, a horizontal slider, and a horizontal motor; the vertical moving unit includes a vertical motor, a vertical slider, and a vertical guide rail; the electrostatic spraying assembly is connected to the vertical slider, and the vertical slider is slidably connected to the vertical guide rail; after the vertical guide rail is connected to the horizontal slider, it is slidably connected to the horizontal guide rail, the horizontal motor is power-connected to the horizontal slider, and the vertical motor is power-connected to the vertical slider.

[0010] In some possible implementations, the atomizing nozzle of the electrostatic spray gun is a fan-shaped nozzle; or, the atomizing nozzle of the electrostatic spray gun is at least two circular nozzles arranged side by side.

[0011] In some possible implementations, the spraying platform is made of metal and is grounded.

[0012] In some possible implementations, a heating device is arranged between the electrostatic spraying equipment and the pre-curing powder spreading equipment; the heating device includes: a baking oven and a baking platform; the baking oven includes an outer shell and at least one baking lamp, the baking platform passes through the outer shell of the baking oven, the collector is laid on the baking platform, and at least one baking lamp is arranged on the inner side of the outer shell for heating the electrode powder material on the collector.

[0013] In some possible implementations, the number of the heating lamps of the heating device is 5-10, and the 5-10 heating lamps are evenly distributed in the housing of the heating device.

[0014] In some possible implementations, the temperature of each baking lamp of the heating device is 100°C-150°C.

[0015] In some possible implementations, the precuring powder spreading equipment includes at least one precuring powder spreading component and a powder spreading platform; at least one precuring powder spreading component is arranged relative to the powder spreading platform; the precuring powder spreading component includes a precuring powder spreading roller and a precuring powder spreading motor, and the precuring powder spreading roller and the precuring powder spreading motor are power-connected.

[0016] In some possible implementations, the pre-curing powder spreading device further includes an adjusting component, and the adjusting component is used to adjust the distance between the pre-curing powder spreading component and the powder spreading platform.

[0017] In some possible implementations, the distance between the pre-curing powder spreading roller and the powder spreading platform is 200-500 μm.

[0018] In some possible implementations, when there are two pre-curing powder spreading components, the surfaces of the two pre-curing powder spreading components are arranged in sequence according to the rolling direction; the pre-curing powder spreading roller of the pre-curing powder spreading component arranged in front is a patterned roller, and the pre-curing powder spreading roller of the pre-curing powder spreading component arranged in the back is a smooth roller.

[0019] In the first aspect, after electrostatic spraying, the pre-curing powder spreading equipment is used to roll the current collector sprayed with the electrode powder material, so that the composition and thickness of the electrode powder material on the current collector are uniform, thereby ensuring stable battery performance.

[0020] In the second aspect, the embodiment of the present application provides a powder spraying dry electrode manufacturing equipment, the first aspect provides a powder spraying device, a winding and unwinding device, a preheating device, and a hot rolling device; the winding and unwinding device includes a winding assembly and a winding assembly, and the winding assembly, the electrostatic spraying equipment, the heating equipment, the pre-curing powder spreading equipment, the preheating device, the hot rolling device and the winding assembly are connected in sequence; the winding assembly includes a feeding roller, a winding guide roller and a winding tension control roller, and the winding assembly includes a winding roller, a winding guide roller and a winding tension control roller; the current collector is placed on the feeding roller, and the current collector passes through the winding guide roller, the winding tension control roller, and the winding guide roller. The electrode powder material on the current collector is rolled into a pre-cured powder-laying device, and the pre-heating device and the pre-cured powder-laying device are used to heat the electrode powder material on the current collector when the current collector passes by; the pre-cured powder-laying device and the pre-heating device are used to heat the electrode powder material on the current collector when the current collector passes by; the pre-cured powder-laying device and the pre-heating device are used to heat the electrode powder material on the current collector when the current collector passes by; the pre-cured powder-laying device is used to hot-roll the electrode powder material on the current collector when the current collector passes by.

[0021] In some possible implementations, the equipment also includes a mixing device; the mixing device includes a sealed cabin and a mixing assembly; a cabin door and a cylinder are provided on the sealed cabin, and the cylinder is dynamically connected to the cabin door for controlling the switch state of the cabin door; the sealed cabin also includes a vacuum pump, and the vacuum pump is connected to the sealed cabin through an air pipe; the mixing assembly includes a moving frame, a moving motor and at least one rotating material tank; the rotating material tank is provided on the moving frame, and the moving motor is dynamically connected to the moving frame for driving the moving frame to swing and rotate; the rotating material tank includes a material tank and a rotating motor, and the rotating motor is used to drive the material tank to rotate in the opposite direction of the rotation of the moving frame.

[0022] In some possible embodiments, the preheating device includes: a baking oven and a baking platform; the baking oven includes an outer shell and at least one baking lamp, the baking platform passes through the outer shell of the baking oven, the current collector is laid on the baking platform, and at least one baking lamp is arranged on the inner side of the outer shell for baking the electrode powder material on the current collector.

[0023] In some possible implementations, the number of the heating lamps of the preheating device is 5-10, and the 5-10 heating lamps are evenly distributed in the housing of the preheating device.

[0024] In some possible implementations, the temperature of each baking lamp of the preheating device is 150°C-180°C.

[0025] In some possible implementations, the hot rolling device includes: at least one rolling assembly; the rolling assembly includes a guide roller, a guide plate, a differential roller machine, a roller temperature controller, a roller gap regulator, and a roller speed regulator; the roller temperature controller, the roller gap regulator, and the roller speed regulator are arranged on the differential roller machine, the roller temperature controller is used to control the roller surface temperature of the differential roller machine, the roller gap regulator is used to control the roller gap between the two rollers of the differential roller machine, and the roller speed regulator is used to control the rotational speed of each of the two rollers of the differential roller machine; the guide roller and the guide plate are arranged before the differential roller machine, and the collector enters between the two rollers of the differential roller machine after passing through the guide roller and the guide plate.

[0026] In some possible implementations, when there are multiple rolling assemblies, the last rolling assembly also includes: a hydraulic assembly; the hydraulic assembly is arranged on the differential roller machine, and is used to apply pressure to the two rollers of the differential roller machine, and the differential ratio of the differential roller machine of the last rolling assembly is 1:1.

[0027] In some possible embodiments, the hot rolling device includes 6 rolling assemblies; the differential speed ratio of the differential speed roller machine of the first rolling assembly is 1:4-1:9, the roller gap between the two rollers is 150 to 300 μm, the rolling pressure is 2T to 4T, the rolling speed is 1 meter to 3 meters per minute, and the roller surface temperature of the roller is 170°C to 190°C; the differential speed ratio of the differential speed roller machine of the second rolling assembly is 1:3 to 1:7, the roller gap between the two rollers is 100 to 250 μm, the rolling pressure is 3T to 6T, the rolling speed is 1 meter to 3 meters per minute, and the roller surface temperature of the roller is 170°C to 190°C; the differential speed ratio of the differential speed roller machine of the third rolling assembly is 1:2.5 to 1:5, the roller gap between the two rollers is 80 to 120 μm, the rolling pressure is 4T to 8T, the rolling speed is 1 meter to 3 meters per minute, and the roller surface temperature of the roller is The temperature is 170℃ to 190℃; the differential speed ratio of the differential speed roller machine of the fourth rolling assembly is 1:1.5 to 1:3, the roller gap between the two rollers is 60-100μm, the rolling pressure is 5T to 10T, the rolling speed is 1m to 3m per minute, and the roller surface temperature of the roller is 170℃ to 190℃; the differential speed ratio of the differential speed roller machine of the fifth rolling assembly is 1:1.1 to 1:1.5, and the gap between the two rollers is 60-100μm. The roll gap is 30 to 60μm, the rolling pressure is 6T to 12T, the rolling speed is 1m to 3m per minute, and the roller surface temperature is 170℃ to 190℃; the differential speed ratio of the differential roller machine of the sixth rolling assembly is 1:1, the roll gap between the two rollers is 30 to 50μm, the rolling pressure is 15T to 25T, the rolling speed is 1m to 3m per minute, and the roller surface temperature is 170℃ to 190℃.

[0028] In some possible implementations, a thickness measuring device is further provided between the hot rolling device and the winding assembly.

[0029] In the second aspect, the active material, binder and conductive agent are first stirred and mixed to obtain an electrode powder material with uniform particle size distribution through processes such as mixing, spraying, heating, powdering, preheating, hot rolling, and thickness measurement. The electrode powder material is sprayed onto the current collector by an electrostatic spray gun, and the electrode powder material is adsorbed on the current collector by static electricity, and then the electrode powder material is evenly laid by heating and rolling. Next, the electrode powder material is preheated by a high-temperature baking oven, and the electrode powder material is cured by a hot rolling device by heating and pressurizing. Finally, the cured electrode powder material is rolled and thinned multiple times by a multi-stage hot rolling device to obtain a highly dense target pole piece, and the electrode composition and thickness on the target pole piece are uniform, which can ensure stable battery performance. And the electrodes can be quickly mass-produced through a powder spray dry electrode manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a powder spraying device provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of an electrostatic spraying device provided in one embodiment of the present application;

[0033] Figure 3 A schematic diagram of the structure of a horizontal moving unit in an electrostatic spraying device provided in an embodiment of the present application;

[0034] Figure 4 A schematic structural diagram of a vertical moving unit in an electrostatic spraying device provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of the structure of a pre-curing powder spreading device provided in one embodiment of the present application;

[0036] Figure 6 A schematic diagram of the structure of a pre-curing powder spreading component and an adjustment component provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the structure of a powder spraying dry electrode manufacturing equipment provided in one embodiment of the present application;

[0038] Figure 8 A schematic diagram of the structure of a mixing device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described in conjunction with the drawings in the embodiment of the utility model. It should be understood that the drawings in the utility model only serve the purpose of illustration and description, and are not used to limit the scope of protection of the utility model. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in the utility model shows the operations implemented according to some embodiments of the utility model. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the utility model, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0040] In addition, the embodiments described in the present invention are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the present invention, the unit N represents Newton, T represents tons, and MPa represents megapascals.

[0045] Lithium-ion batteries have been widely used in portable electronic products such as mobile phones and computers, as well as electric vehicles, due to their high energy density, excellent cycle performance and long service life. These advantages make lithium-ion batteries an ideal source of power for these devices, meeting the needs of modern society for high efficiency, environmental protection and portability.

[0046] Traditional lithium-ion batteries are often mass-produced using a wet electrode manufacturing process to manufacture electrodes. During the manufacturing process, N-methylpyrrolidone solvent is required for homogenization and then drying. N-methylpyrrolidone solvent is toxic and corrosive, and there is a risk of affecting human health. Drying the solvent consumes a lot of energy, increasing the cost of electrode manufacturing.

[0047] Moreover, when lithium-ion batteries use sulfide solid electrolytes, since sulfide solid electrolytes are sensitive to water and polar organic solvents, they are affected by solvents during manufacturing, resulting in the destruction of the crystal structure and a decrease in lithium ion conductivity. In addition, during the drying process, the binder and the conductive agent will float on the surface and agglomerate due to capillary action and diffusion, which may cause the active material to precipitate, thereby causing electrode stratification. This stratification phenomenon will make the electrode easy to crack and reduce its structural stability.

[0048] At present, there are some dry electrode manufacturing processes, which use electrostatic spraying to spray electrode powder materials (including binders, conductive agents and active materials) onto the surface of the current collector, and then heat and roll to obtain electrodes. By using the dry electrode manufacturing process, the problems caused by the use of solvents in the wet electrode manufacturing process can be solved.

[0049] However, when using the electrostatic spraying process, the uniformity of the prepared electrode varies due to differences in material morphology, particle size, electrostatic response, etc., making it difficult to obtain the desired thickness and battery performance. Therefore, there is an urgent need for a powder spraying device that can produce uniform composition, consistent thickness, and stable battery performance.

[0050] To solve this problem, the present application provides a powder spraying device, powder spraying dry electrode manufacturing equipment and method.

[0051] Figure 1 This is a schematic diagram of the structure of a powder spraying device provided in one embodiment of the present application. Figure 2 A schematic diagram of the structure of an electrostatic spraying device provided in one embodiment of the present application.

[0052] Reference Figure 1 The powder spraying device 1 includes: an electrostatic spraying device 11 and a pre-curing powder spreading device 13 .

[0053] The electrostatic spraying device 11 includes a negative pressure control component, a spraying platform 111 , at least one electrostatic spraying component 112 , a moving component 113 , a recovery component 115 and a supporting component 116 .

[0054] The negative pressure control assembly includes a negative pressure box 114 and an air suction unit (not shown), the spraying platform 111 is arranged at the bottom center of the negative pressure box 114, the electrostatic spraying assembly 112 is connected to the moving assembly 113 and is arranged at the top of the negative pressure box 114, the electrostatic spraying assembly 112 is arranged opposite to the spraying platform 111, and the spraying platform 111 is used to carry the current collector. The air suction unit is connected to the negative pressure box 114 and is used to discharge the gas in the negative pressure box.

[0055] In some possible implementations, the suction unit may be a vacuum pump, a fan, etc. The material of the spraying platform 111 may be a metal material with good electrical conductivity, the platform surface is smooth, and the spraying platform 111 needs to be connected to a ground wire.

[0056] In some possible implementations, the electrostatic spraying assembly is used to spray the electrode powder material onto the current collector, referring to Figure 2 The electrostatic spraying assembly includes a powder supply barrel (not shown), a powder suction pipeline (not shown), an electrostatic powder spray gun 112, an air compressor (not shown), and a controller (not shown). The powder supply barrel, the controller, and the air compressor can be arranged at any position outside the negative pressure box 114. The powder supply barrel is connected to the electrostatic powder spray gun 112 through the powder suction pipeline, the electrostatic powder spray gun 112 is connected to the air compressor through the air pipe, and the controller is electrically connected to the electrostatic powder spray gun 112 and the air compressor.

[0057] In some possible implementations, the electrostatic powder spray gun 112 is connected to a high voltage power supply and is equipped with an atomizing nozzle 1121 , and air pressure can be provided to the electrostatic powder spray gun 112 through an air compressor.

[0058] As an example, the amount of powder sprayed by the electrostatic powder spray gun 112 can be controlled by controlling the air pressure through the controller, the amount of powder atomization can be controlled by controlling the atomization air pressure through the controller, and the negative charge of the atomized powder can be controlled by controlling the voltage and current of the high-voltage power supply. During operation, the electrode powder material in the powder supply barrel enters the electrostatic powder spray gun 112 along the powder suction pipeline by air pressure, and the electrostatic powder spray gun 112 atomizes the powder and carries a negative charge, and sprays it onto the current collector.

[0059] In some possible implementations, the atomizing nozzle 1121 of the electrostatic spray gun 112 is a fan-shaped nozzle; or, the atomizing nozzle of the electrostatic spray gun includes at least two circular nozzles arranged side by side. In specific implementation, the nozzle can meet the collector width requirement during spraying.

[0060] In some possible implementations, after the controller controls the air compressor to press the electrode powder material in the powder supply barrel to the electrostatic powder spray gun 112 through the powder suction pipeline, the electrostatic powder spray gun 112 is controlled to operate. After the electrostatic powder spray gun 112 makes the electrode powder material negatively charged, it is sprayed on the collector carried by the spraying platform 111.

[0061] Since the electrode powder material sprayed from the electrostatic powder spray gun 112 is negatively charged, it can be adsorbed onto the current collector by electrostatic effect. Since the spraying platform 111 is grounded, the current collector laid on the spraying platform 111 is also equivalent to being grounded (i.e., the current collector is positively charged), and the negatively charged electrode powder material is adsorbed onto the positively charged current collector.

[0062] Some possible implementations include Figure 2 The moving component 113 includes a horizontal moving unit and a vertical moving unit. The horizontal moving unit is used to drive the electrostatic spraying component 112 to move in the horizontal direction, and the vertical moving unit is used to drive the electrostatic spraying component 112 to move in the vertical direction.

[0063] The negative pressure box 114 is disposed on the supporting assembly 116 , the recovery assembly 115 is disposed in the supporting assembly 116 , and the recovery assembly 115 is communicated with the bottom of the negative pressure box 114 .

[0064] In some possible implementations, the support assembly 116 may be a metal bracket, a plastic bracket or a bracket made of other materials with sufficient strength. The support assembly 116 may be a rectangular frame, and a plurality of support members, such as rubber foot pads, rollers, etc., may be provided at the end close to the ground. The recovery assembly 115 is fixedly connected to the end away from the ground through a fixed connector, and the recovery assembly 115 may include a ventilation duct and a powder recovery box, one end of the ventilation duct is connected to the suction unit, and the other end is connected to the powder recovery box. When the suction unit is in operation, the gas in the negative pressure box 114 and the electrode powder material scattered during spraying are sucked into the powder recovery box. The powder recovery box includes a filter part and a collection part. The filter part is connected to the ventilation duct, and at least one filter powder assembly is provided in the filter part. The collection part is connected to the filter powder assembly, and is used to receive the electrode powder material filtered by the filter powder assembly.

[0065] The pre-curing powder spreading device 13 and the electrostatic spraying device 11 are connected in sequence, and the pre-curing powder spreading device 13 is used to roll and spread the current collector sprayed with electrode powder material.

[0066] In this embodiment, after electrostatic spraying, the pre-curing powder spreading equipment is used to roll and spread the current collector sprayed with electrode powder material, so that the composition and thickness of the electrode powder material on the current collector are uniform, thereby ensuring stable battery performance.

[0067] Figure 3This is a schematic diagram of the structure of a horizontal moving unit in an electrostatic spraying device provided in an embodiment of the present application. Figure 4 A schematic structural diagram of a vertical moving unit in an electrostatic spraying device provided in one embodiment of the present application.

[0068] For some possible implementations, refer to Figure 3 The horizontal moving unit includes a horizontal guide rail 1131, a horizontal slider 1132, and a horizontal motor 1133. Figure 4 The vertical moving unit includes a vertical guide rail 1137, a vertical motor 1136, a connector 1134, and a vertical slider 1135. The electrostatic spraying assembly 112 is connected to the vertical slider 1135 through the connector 1134, and the vertical slider 1135 is slidably connected to the vertical guide rail 1137. The vertical guide rail 1137 is connected to the horizontal guide rail 1131 through a fixing plate (not shown), the horizontal motor 1133 is connected to the horizontal slider 1131, and the vertical motor 1136 is connected to the vertical slider 1135.

[0069] For some possible implementations, refer to Figure 3 and Figure 4 , the horizontal slider 1132 is sleeved on the horizontal guide rail 1131, and the horizontal slider 1132 can be connected to the horizontal motor 1133 by means of a pulley, a gear, etc. When the horizontal motor 1133 rotates, the horizontal slider 1132 is driven to move in the horizontal direction along the horizontal guide rail 1131. The horizontal slider 1132 is provided with a connecting hole on the plane extending from the horizontal guide rail to the side, and the connecting hole of the vertical guide rail 1137 is fixedly connected to the horizontal slider 1132. The vertical slider 1135 is sleeved on the vertical guide rail 1137, and the vertical slider 1135 can be connected to the vertical motor 1136 by means of a gear. When the vertical motor 1136 rotates, the vertical slider 1135 is driven to move in the vertical direction along the vertical guide rail 1137.

[0070] For some possible implementations, refer to Figure 1 A heating device 12 is provided between the pre-curing powder spreading device 13 and the electrostatic spraying device 11. The heating device 12 includes: a baking oven and a baking platform 123; the baking oven includes a shell 121 and at least one baking lamp 122, the baking platform 123 passes through the shell 121 of the baking oven, the current collector is laid on the baking platform 123, and at least one baking lamp 122 is provided inside the shell 121 for heating the electrode powder material on the current collector.

[0071] As an example, the baking lamp can be an infrared short-wave baking lamp, a heating tube baking lamp, etc. The present application does not limit the type of baking lamp.

[0072] In some possible implementations, the number of the heating lamps 122 of the heating device is 5-10, and the 5-10 heating lamps are evenly distributed in the housing 121 of the heating device 12.

[0073] In some possible implementations, the temperature of each heating lamp 122 of the heating device 12 is 100° C.-150° C.

[0074] For example, a temperature sensor can be set on the side of the baking platform 123 to collect the temperature on the baking platform 123 and feed the temperature back to the controller that controls the electrostatic spraying device. The controller can adjust the temperature of the baking lamp by controlling the power of the baking lamp.

[0075] Figure 5 A schematic diagram of the structure of a pre-curing powder spreading device provided in one embodiment of the present application.

[0076] For some possible implementations, refer to Figure 5 The pre-curing powder spreading device 13 includes at least one pre-curing powder spreading component 131 and a powder spreading platform 134; at least one pre-curing powder spreading component 131 is arranged opposite to the powder spreading platform 134; the pre-curing powder spreading component includes a pre-curing powder spreading roller 1311 and a pre-curing powder spreading motor 1312, and the pre-curing powder spreading roller 1311 and the pre-curing powder spreading motor 1312 are power-connected.

[0077] In some possible implementations, the pre-curing powder spreading device 13 further includes an adjusting component 133 , and the adjusting component 133 is used to adjust the distance between the pre-curing powder spreading component 131 and the powder spreading platform 134 .

[0078] Figure 6 A schematic diagram of the structures of a pre-curing powder spreading component and an adjustment component provided in one embodiment of the present application.

[0079] For some possible implementations, refer to Figure 5 and Figure 6 The pre-curing powder spreading equipment 13 includes: at least one pre-curing powder spreading component 131, an adjusting component 133 and an upper supporting platform 132; the pre-curing powder spreading component 131 is arranged below the supporting platform 132, and the adjusting component 133 is arranged above the upper supporting platform 132, and is arranged opposite to the pre-curing powder spreading component 131.

[0080] Among them, the upper support platform 132 is fixedly connected to the support structure 135 through a plurality of connectors. The pre-curing powder spreading assembly 131 is used to evenly spread the electrode material powder accumulated on the material to be spread on the material to be spread. The adjustment assembly 133 is used to adjust the height, level, etc. of the pre-curing powder spreading assembly 131 so that the gap between the pre-curing powder spreading assembly 131 and the powder spreading platform 134 can meet the laying accuracy requirements. For example, the distance between the pre-curing powder spreading roller and the powder spreading platform can be 200-500μm.

[0081] For some possible implementations, refer to Figure 6The pre-curing powder spreading component 131 includes: a pre-curing powder spreading roller 1311, a pre-curing powder spreading motor 1312, a connecting frame, and a powder scraper plate 1313; the pre-curing powder spreading motor 1312 is arranged on the first side plate 1314 of the connecting frame, one end of the pre-curing powder spreading roller 1311 is connected to the pre-curing powder spreading motor 1312, and the other end passes through the first side plate 1314 and is connected to the bearing arranged on the second side plate 1315 of the connecting frame; the powder scraper plate 1313 is fixedly connected to the connecting frame, and one side of the powder scraper plate 1313 is in contact with the pre-curing powder spreading roller 1311.

[0082] As an example, the pre-curing powder spreading motor 1312 may be a reduction motor, which is used to drive the pre-curing powder spreading roller 1311 to rotate. The first side plate 1314 and the second side plate 1315 can block the electrode material powder from spreading during the powder spreading process, thereby controlling dust.

[0083] The scraper plate 1313 can be made of metal, polyurethane (PU) and other materials. The scraper plate 1313 can include a fixed plate, a scraper plate and a connecting plate. At least two fixed connection holes are correspondingly provided on the fixed plate, the scraper plate and the connecting plate. One end of the connecting plate is fixedly connected to the first side plate 1314, and the other end is fixedly connected to the second side plate 1315. The fixed plate fixes the scraper plate to the connecting plate through a fixed connecting member (such as a screw), and the scraper plate abuts against the pre-curing powder roller 1311 to scrape off the electrode material powder adsorbed on the pre-curing powder roller 1311. The length of the scraper plate can be greater than or equal to the width of the pre-curing powder roller 1311.

[0084] In some possible implementations, the adjustment component 133 includes: at least two spring adjusters 1331 and two digital micrometers 1332; the spring adjuster 1331 and the digital micrometer 1332 are passed through the upper support platform 132 and fixedly connected to the upper support platform 132, and the spring adjuster 1331 and the digital micrometer 1332 are respectively arranged at both ends of the pre-curing powder spreading component 131; one end of the spring adjuster 1332 is fixedly connected to the top plate 1316 of the connecting frame; one end of the digital micrometer 1332 is abutted against the top plate 1316 of the connecting frame.

[0085] The spring adjuster 1331 includes a spring stopper 1333, a rectangular spring 1334, and a linear bearing 1335. The linear bearing 1335 passes through the upper support platform 132 and is fixedly connected to the upper support platform 132. One end of the linear bearing 1335 is fixedly connected to the top plate 1316 of the connecting frame. After the rectangular spring 1334 is sleeved on the other end of the linear bearing 1335, a spring stopper 1333 is provided on the other end of the linear bearing 1335. One end of the rectangular spring 1334 abuts against the spring stopper 1333, and the other end abuts against the upper support platform 132. The spring stopper 1333 is screwed with the linear bearing 1335. When the spring stopper 1333 rotates, the force applied to the linear bearing 1335 will be increased or decreased, so that the extension and contraction degree of the linear bearing 1335 will change, thereby driving the connecting frame to move up and down.

[0086] One end of the digital micrometer 1332 is a display end, and the other end is a measuring end. The display end is fixedly connected to the upper support platform 132 through a fixed connector, and the measuring end passes through the support platform 132 and abuts against the top plate 1316 of the connection frame, thereby displaying the distance between the top plate 1316 of the connection frame and the upper support platform 132 on the display end. When the connection frame is driven by the spring adjuster 1331 to move, the length of the measuring end will also change, and the distance value displayed on the display end will also change accordingly.

[0087] In some possible implementations, when there are two pre-curing powder spreading components, the two pre-curing powder spreading components 131 are arranged in sequence according to the rolling direction; the pre-curing powder spreading roller 1311 of the pre-curing powder spreading component 131 arranged in front is a patterned roller, and the pre-curing powder spreading roller 1311 of the pre-curing powder spreading component 131 arranged in the back is a smooth roller.

[0088] In some possible implementations, the pattern roller is provided with patterns so that the electrode material powder accumulated on the current collector can be quickly dispersed to the position where it needs to be laid on the current collector. The other smooth roller of the pre-curing powder spreading assembly 131 can press the electrode material powder that has been dispersed on the current collector evenly, so that the electrode material powder is evenly laid on the current collector.

[0089] Based on the above-mentioned powder spraying device, the present application also provides a powder spraying dry electrode manufacturing equipment, which is used to quickly mass-produce electrodes through a powder spraying dry electrode manufacturing process.

[0090] Figure 7 A schematic structural diagram of a powder spraying dry electrode manufacturing equipment provided in one embodiment of the present application.

[0091] For some possible implementations, refer to Figure 7 , powder spray dry electrode manufacturing equipment includes:

[0092] Winding and unwinding device, powder spraying device 1, preheating device 2, hot roller pressing device 3;

[0093] The unwinding and rewinding device comprises an unwinding component 4 and a rewinding component 5, wherein the unwinding component 4, an electrostatic spraying device 11, a heating device 12, a pre-curing powder spreading device 13, a preheating device 2, a hot roller pressing device 3 and the rewinding component 5 are connected in sequence;

[0094] The unwinding assembly includes an unwinding roller 41, an unwinding guide roller 42 and an unwinding tension control roller 43, and the winding assembly includes a winding roller 51, a winding guide roller 52 and a winding tension control roller 53;

[0095] The current collector 6 is placed on the unwinding roller 41, and after passing through the unwinding guide roller 42, the unwinding tension control roller 43, the electrostatic spraying device 11, the heating device 12, the pre-curing powder spreading device 13, the preheating device 2, the hot roller pressing device 3, the winding guide roller 52, and the winding tension control roller 53, the current collector 6 is connected to the winding roller 51;

[0096] The electrostatic spraying device 11 is used to spray the electrode powder material onto the current collector 6 when the current collector passes by; the pre-curing powder spreading device 13 is used to roll and flatten the electrode powder material spread on the current collector 6 when the current collector 6 passes by;

[0097] The heating device 12 and the preheating device 2 are used to heat the electrode powder material laid on the current collector 6 when the current collector 6 passes by;

[0098] The hot rolling device 3 is used to hot roll-press the electrode powder material laid on the current collector 6 when the current collector 6 passes by.

[0099] In some possible implementations, the material of the current collector 6 may be aluminum, copper, or other metal composite materials, etc. As an example, when manufacturing the positive electrode of a lithium battery, the current collector may be an aluminum foil coil of a preset size, and when manufacturing the negative electrode of a lithium battery, the current collector may be a copper foil coil of a preset size.

[0100] Taking the aluminum foil coil as an example, the unwinding roller 41 can pass through the reel of the aluminum foil coil so that the aluminum foil coil is placed on the unwinding roller 41 .

[0101] As an example, a winding motor can be provided on the winding roller 51 to drive the winding roller 51 to rotate, thereby driving the current collector to move. In the present application, the current collector running speed can be set to 1-15m / min, and a correction component can also be provided on the unwinding guide roller 42 and the winding guide roller 52 to control the horizontal offset of the current collector to be maintained within the range of ±25μm. The unwinding tension control roller 43 and the winding tension control roller 53 can be adjusted in position so that the tension of the current collector is controlled within the range of 5N-15N.

[0102] In some possible implementations, when the unwinding assembly 4, the electrostatic spraying device 1, the preheating device 2, the hot rolling device 3, and the winding assembly 5 are connected in sequence, the above components and devices may be fixedly connected by a connector, or the above devices or components may be simply arranged in order, and this application does not limit this. In actual application, the specific connection method is based on the ability to pass the current collector through each component and device in sequence.

[0103] In this embodiment, the active material, binder and conductive agent are first stirred and mixed to obtain an electrode powder material with uniform particle size distribution through processes such as mixing, spraying, heating, powdering, preheating, hot rolling, and thickness measurement. The electrode powder material is sprayed onto the current collector by an electrostatic spray gun, and the electrode powder material is adsorbed on the current collector by static electricity, and then the electrode powder material is evenly laid by heating and rolling. Next, the electrode powder material is preheated by a high-temperature baking oven, and the electrode powder material is cured by heating and pressurizing a hot rolling device. Finally, the cured electrode powder material is rolled and thinned multiple times by a multi-stage hot rolling device to obtain a highly dense target electrode sheet. The electrode composition and thickness on the target electrode sheet are uniform, which can ensure stable battery performance. And the electrodes can be quickly mass-produced through a powder spray dry electrode manufacturing process.

[0104] In some possible implementations, the electrode powder material added to the powder bin needs to be fully mixed so that materials with different particle sizes and fluidities are mixed evenly. When mixing, the mixing device provided in the present application can be used.

[0105] In some possible implementations, the material mixing device includes a sealed cabin and a material mixing component.

[0106] As an example, the sealed cabin may be provided with a cabin door and a cylinder, wherein the cylinder is connected to the cabin door power for controlling the opening and closing state of the cabin door; the sealed cabin may also include a vacuum pump, which is connected to the sealed cabin through an air pipe.

[0107] When the air cylinder is controlled to close the hatch of the sealed cabin, the vacuum pump can be started to evacuate the sealed cabin, and when the vacuum degree reaches a certain value, mixing can be started through the mixing component. For example, when the vacuum degree reaches below 1mbar-2mbar, mixing can be started through the mixing component.

[0108] Figure 8 A schematic diagram of the structure of a mixing component provided in one embodiment of the present application.

[0109] The mixing assembly 8 includes a moving frame 81, a moving motor 82 and at least one rotating material tank 83; the rotating material tank 83 is arranged on the moving frame 81, and the moving motor 82 is connected to the moving frame 81 for driving the moving frame 81 to swing and rotate; the rotating material tank 83 includes a material tank 831 and a rotating motor (arranged in the moving frame, not shown), and the rotating motor is used to drive the material tank 831 to rotate in the opposite direction of the rotation of the moving frame 81.

[0110] In some possible embodiments, the material tank 831 may include a connecting port, and a feeding port may be set at the top of the powder bin 111. The connecting port of the material tank 831 is provided with an iris structure. When the connecting port of the material tank 831 is inserted into the feeding port of the powder bin and rotated to tighten, the blades of the iris structure can be driven to open, so that the material tank 831 and the inside of the powder bin are connected, and then the evenly mixed electrode powder material in the material tank 831 falls into the powder bin 111 under the action of gravity.

[0111] In some possible implementations, the material tank 831 can be removed from the moving frame 81 by a transfer device such as a robotic arm, an adsorption pickup device, etc. arranged near the electrostatic spraying equipment, and installed in the powder supply barrel to realize automatic feeding.

[0112] It should be noted that since the material tank 831 will rotate at high speed during mixing, this will cause the temperature of the material tank 831 to increase. Since the material tank 831 may be made of metal material, Teflon material can be used to insulate the material tank 831, and a Teflon insulation ring 832 can be set around the material tank 831.

[0113] In some possible implementations, adding material to the material tank 831 can also be achieved through the connection port. For example, the iris structure is moved by a corresponding mechanism so that the leaves of the iris structure open to expose the connection port, and the electrode powder material is added to the material tank 831 through the connection port.

[0114] As an example, the electrode powder material includes three materials: electrode active material, binder and conductive agent powder, and the three materials can be loaded into the rotating material tank according to a preset ratio. In order to ensure the balance of the moving frame when rotating, the rotating material tank can be set to 3.

[0115] After the electrode powder material is loaded into the rotating material tank, the hatch of the sealed cabin can be closed by the cylinder control, and the sealed cabin can be evacuated by the vacuum pump. After the vacuum degree reaches below 2mbar, the motion motor is controlled to make the motion frame swing and rotate. As an example, the swinging and rotating speed of the motion frame can be 1000-2000r / min. At the same time, the rotating motor of each rotating material tank is controlled so that each rotating material tank rotates at 500-1000r / min in the opposite direction of the swinging rotation of the motion frame for 0.5 to 1 hour to complete the mixing. Among them, during mixing, the ambient humidity can be less than 30%RH and the temperature is between -10℃ and 40℃.

[0116] In some possible implementations, the mixing process may adopt staged mixing. That is, multiple stages with different rotation speeds and durations may be set according to factors such as the particle size difference of the materials, the material fluidity, and the material composition, so as to achieve different mixing effects. For example, the worse the material fluidity, the higher the rotation speed and the longer the time required; the more material components to be mixed, the more stages required.

[0117] In some possible implementations, since the high-speed mixing process may cause the material to heat up, it is necessary to dissipate heat through a staged mixing method.

[0118] As an example, the first stage can be set to use low-speed mixing, for example, the swinging speed of the moving frame is set to 1000r / min, and the rotation speed of the rotating tank is 500r / min, which lasts for 5min; the second stage can be set to use medium-speed mixing, for example, the swinging speed of the moving frame is set to 1500r / min, and the rotation speed of the rotating tank is 750r / min, which lasts for 10min; the third stage can be set to use high-speed mixing, for example, the swinging speed of the moving frame is set to 2000r / min, and the rotation speed of the rotating tank is 1000r / min, which lasts for 15min.

[0119] In some possible implementations, the structure of the preheating device 2 is similar to that of the heating device 12, which will not be described in detail. It should be noted that in the preheating device 2, the temperature of each baking lamp is 150°C-180°C.

[0120] In some possible embodiments, the hot rolling device includes: at least one rolling assembly; the rolling assembly includes a guide roller, a guide plate, a differential roller machine, a roller temperature controller, a roller gap regulator, and a roller speed regulator; the roller temperature controller, the roller gap regulator, and the roller speed regulator are arranged on the differential roller machine, the roller temperature controller is used to control the roller surface temperature of the differential roller machine, the roller gap regulator is used to control the roller gap between the two rollers of the differential roller machine, and the roller speed regulator is used to control the rotational speed of each of the two rollers of the differential roller machine; the guide roller and the guide plate are arranged before the differential roller machine, and the collector enters between the two rollers of the differential roller machine after passing through the guide roller and the guide plate.

[0121] The current collector with the flat powder enters the differential roller machine through the guide rollers and guide plates for high temperature and high pressure curing. The guide rollers and guide plates can ensure that the current collector enters the differential roller machine smoothly, ensuring that no electrode powder material is shaken off.

[0122] The problem of powder material sticking to the roller can be effectively solved by rolling with a differential speed roller machine. The roller temperature controller needs to ensure that the roller surface temperature of the differential speed roller machine reaches above 180°C during rolling to ensure the high temperature effect.

[0123] The roll gap regulator is used to adjust the roll gap between the rolls to ensure a certain pressure, and the roll speed regulator is used to adjust the roll pressing speed to ensure the roll pressing quality.

[0124] In some possible implementations, when there are multiple rolling assemblies, the last rolling assembly also includes: a hydraulic assembly; the hydraulic assembly is arranged on the differential roller machine, and is used to apply pressure to the two rollers of the differential roller machine, and the differential ratio of the differential roller machine is 1:1.

[0125] In some possible implementations, when there are multiple rolling assemblies, the front multi-stage rolling assembly is mainly used to gradually reduce the roller gap, increase the pressure, achieve secondary high temperature and high pressure curing, enhance the curing effect, and perform thinning by reducing the roller gap.

[0126] The last stage of rolling assembly is used to compact and ensure the surface flatness. Compared with the previous rolling assembly, the differential speed ratio of the differential roller machine can be set to 1:1, and the roller gap can be adjusted to the target pole piece thickness to achieve synchronous rolling to ensure surface flatness and compact the pole piece to the target thickness. At the same time, the pressure between the two rollers of the differential roller machine is increased through the hydraulic device to ensure that the electrode powder material on the pole piece is further compacted, improve the density of the pole piece, and obtain the target pole piece.

[0127] In some possible implementations, the hot rolling device is a multi-stage rolling device, referring to Figure 7 , the hot rolling device includes 6 rolling assemblies;

[0128] The differential speed ratio of the differential roller machine of the first rolling assembly is 1:6, the roll gap between the two rollers is 150μm to 300μm, the rolling pressure is 2T to 4T, the rolling speed is 1m to 3m per minute, and the roller surface temperature of the roller is 170℃ to 190℃.

[0129] The differential speed ratio of the differential roller machine of the second rolling assembly is 1:4.5, the roll gap between the two rollers is 100μm to 250μm, the rolling pressure is 3T to 6T, the rolling speed is 1m to 3m per minute, and the roller surface temperature of the roller is 170℃ to 190℃.

[0130] The differential speed ratio of the differential roller machine of the third rolling assembly is 1:3, the roller gap between the two rollers is 80μm to 120μm, the rolling pressure is 4T to 8T, the rolling speed is 1m to 3m per minute, and the roller surface temperature is 170℃ to 190℃.

[0131] The differential speed ratio of the differential roller machine of the fourth rolling assembly is 1:2, the roller gap between the two rollers is 60μm to 100μm, the rolling pressure is 5T to 10T, the rolling speed is 1m to 3m per minute, and the roller surface temperature of the roller is 170℃ to 190℃.

[0132] The differential speed ratio of the differential roller machine of the fifth rolling assembly is 1:1.5, the roller gap between the two rollers is 30μm to 60μm, the rolling pressure is 6T to 12T, the rolling speed is 1m to 3m per minute, and the roller surface temperature is 170℃ to 190℃.

[0133] The differential speed ratio of the differential roller machine of the sixth rolling assembly is 1:1, the roller gap between the two rollers is 60μm to 50μm, the rolling pressure is 15T to 25T, the rolling speed is 1m to 3m per minute, and the roller surface temperature of the roller is 170℃ to 190℃.

[0134] In some possible implementations, the hot roller pressing device may further include a residual material recovery tank, which may be disposed below the differential speed roller machine to receive the electrode powder material scattered during the rolling process.

[0135] In some possible implementations, a thickness measuring device 7 is further provided between the hot rolling device and the winding assembly.

[0136] As an example, the thickness measuring device 7 can use optical fiber to measure the thickness of the pole piece. The thickness of the pole piece is measured by optical fiber laser, and the thickness of the prepared pole piece is obtained by the feedback value. The thickness error is ±5μm.

[0137] The embodiment of the present application provides a powder spraying dry electrode manufacturing equipment. When used, the current collector can be moved from the winding assembly to the unwinding assembly at a speed of 2 to 5 meters per minute by controlling the winding and unwinding device. The tension range of the current collector during movement is 5N to 15N. When passing through the spraying equipment, the air pressure range of the electrostatic spray gun spraying the electrode powder material is 0.01 to 0.3MPa, the atomization air pressure range is adjusted to 0.01 to 0.1MPa, the electrostatic voltage is adjusted to 20 to 60kV, the current is 80-160mA, and the electrode powder material is controlled to be negatively charged. The distance between the electrostatic spray gun and the spraying platform is 1 00-200mm; the horizontal movement speed of the spray gun is 20-40 meters per minute; the electrode powder material is heated by a heating device to make the temperature of the electrode powder material reach 100°C to 150°C; the electrode powder material sprayed on the collector is rolled to a thickness of 200μm to 500μm by a pre-curing powder spreading device; the electrode powder material is heated by a preheating device to make the temperature of the electrode powder material reach 150°C to 180°C; the electrode powder material laid on the collector is pressurized and rolled at 170°C to 190°C by a hot rolling device to obtain a target electrode sheet.

[0138] In some possible implementations, when the hot rolling device includes a plurality of rolling assemblies, the electrode powder material laid on the current collector is rolled through each rolling assembly in turn at 170° C. to 190° C. to obtain a target electrode sheet.

[0139] Among them, the electrode powder material is rolled multiple times to ensure that the electrode powder material on the electrode sheet is gradually thinned and further compacted, thereby reducing the thickness of the electrode sheet, increasing the density of the electrode sheet, and improving the quality of the electrode sheet.

[0140] In some possible implementations, the thickness of the target pole piece is measured by a thickness measuring device, and the measured thickness of the target pole piece is displayed.

[0141] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A powder spraying device, characterized in that: include: Electrostatic spraying equipment and pre-curing powder laying equipment; The electrostatic spraying equipment includes a negative pressure control component, a spraying platform, at least one electrostatic spraying component, a moving component, a recovery component and a supporting component; The negative pressure control component includes a negative pressure box and an air suction unit, the spraying platform is arranged at the bottom center of the negative pressure box, the electrostatic spraying component is connected to the moving component and is arranged at the top of the negative pressure box, the electrostatic spraying component is arranged opposite to the spraying platform, and the spraying platform is used to carry the current collector; The electrostatic spraying assembly is used to spray electrode powder material onto the current collector, and the electrostatic spraying assembly includes a powder supply barrel, a powder suction pipeline, an electrostatic powder spraying gun, an air compressor and a controller; The powder supply barrel is connected to the electrostatic powder spray gun through the powder suction pipeline, the electrostatic powder spray gun is connected to the air compressor through the air pipe, and the controller is electrically connected to the electrostatic powder spray gun and the air compressor; The moving assembly includes a horizontal moving unit and a vertical moving unit, wherein the horizontal moving unit is used to drive the electrostatic spraying assembly to move in a horizontal direction, and the vertical moving unit is used to drive the electrostatic spraying assembly to move in a vertical direction; The negative pressure box is arranged on the support assembly, the recovery assembly is arranged in the support assembly, the recovery assembly is connected with the bottom of the negative pressure box, and the suction unit is arranged at the connection point; The pre-curing powder spreading equipment and the electrostatic spraying equipment are connected in sequence, and the pre-curing powder spreading equipment is used to roll and flatten the current collector that has been sprayed with electrode powder material.

2. The device according to claim 1, characterized in that The horizontal moving unit includes a horizontal guide rail, a horizontal slider, and a horizontal motor; the vertical moving unit includes a vertical motor, a connecting piece, a vertical slider, and a vertical guide rail; the electrostatic spraying assembly is connected to the vertical slider through the connecting piece; and the vertical slider is slidably connected to the vertical guide rail; After the vertical guide rail is connected to the horizontal slider, it is slidably connected to the horizontal guide rail, the horizontal motor is dynamically connected to the horizontal slider, and the vertical motor is dynamically connected to the vertical slider.

3. The device according to claim 1, characterized in that The atomizing nozzle of the electrostatic powder spray gun is a fan-shaped nozzle; or, the atomizing nozzle of the electrostatic powder spray gun is at least two circular nozzles arranged side by side.

4. The device according to claim 1, characterized in that A heating device is provided between the electrostatic spraying device and the pre-curing powder spreading device; The heating device includes: a baking oven and a baking platform; the baking oven includes an outer shell and at least one baking lamp, the baking platform passes through the outer shell of the baking oven, the current collector is laid on the baking platform, and the at least one baking lamp is arranged on the inner side of the outer shell for heating the electrode powder material on the current collector.

5. The device according to any one of claims 1 to 4, characterized in that: The pre-curing powder spreading equipment comprises at least one pre-curing powder spreading component and a powder spreading platform; The at least one pre-curing powder spreading component is arranged opposite to the powder spreading platform; The pre-curing powder spreading component comprises a pre-curing powder spreading roller and a pre-curing powder spreading motor, and the pre-curing powder spreading roller and the pre-curing powder spreading motor are connected in power.

6. The device according to claim 5, characterized in that The pre-curing powder spreading device also includes an adjusting component, which is used to adjust the distance between the pre-curing powder spreading component and the powder spreading platform.

7. The device according to claim 6, characterized in that The distance between the pre-curing powder spreading roller and the powder spreading platform is 200-500 μm.

8. The device according to claim 5, characterized in that When there are two pre-curing powder spreading components, the two pre-curing powder spreading components are arranged in sequence along the rolling direction; The pre-curing powder spreading roller of the pre-curing powder spreading assembly arranged in front is a patterned roller, and the pre-curing powder spreading roller of the pre-curing powder spreading assembly arranged in the back is a smooth roller.

9. A powder spraying dry electrode manufacturing equipment, characterized in that: include: The powder spraying device, the reeling and unreeling device, the preheating device, and the hot rolling device according to any one of claims 1 to 8; The unwinding and rewinding device comprises an unwinding assembly and a rewinding assembly, wherein the unwinding assembly, an electrostatic spraying device, a heating device, a pre-curing powder spreading device, the preheating device, the hot rolling device and the rewinding assembly are connected in sequence; The unwinding assembly includes an unwinding roller, an unwinding guide roller and an unwinding tension control roller, and the winding assembly includes a winding roller, a winding guide roller and a winding tension control roller; The current collector is placed on the unwinding roller, and after passing through the unwinding guide roller, the unwinding tension control roller, the electrostatic spraying device, the heating device, the pre-curing powder spreading device, the preheating device, the hot roller pressing device, the winding guide roller, and the winding tension control roller, the current collector is connected to the winding roller; The electrostatic spraying device is used to spray the electrode powder material onto the current collector when the current collector passes by; The pre-curing powder spreading device is used to roll and flatten the electrode powder material spread on the current collector when the current collector passes by; The heating device and the preheating device are used to heat the electrode powder material laid on the current collector when the current collector passes by; The hot rolling device is used to hot roll-press the electrode powder material laid on the current collector when the current collector passes by.

10. The device according to claim 9, characterized in that The equipment also includes a mixing device; the mixing device includes a sealed cabin and a mixing component; The sealed cabin is provided with a cabin door and a cylinder, and the cylinder is connected to the cabin door by power to control the switch state of the cabin door; The sealed cabin also includes a vacuum pump, and the vacuum pump is connected to the sealed cabin through an air pipe; The mixing assembly includes a moving frame, a moving motor and at least one rotating material tank; The rotating material tank is arranged on the moving frame, and the moving motor is connected to the moving frame for driving the moving frame to swing and rotate; The rotating material tank comprises a material tank and a rotating motor, and the rotating motor is used to drive the material tank to rotate in the opposite direction of the rotation of the moving frame.

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