Battery pole piece production system

Abstract

The utility model relates to a battery pole piece production system. The battery pole piece production system comprises a primary powder supply device, a mixing device and a rolling device, the preliminary powder mixing device comprises a temporary storage bin, a feeding mechanism and a material mixing mechanism. The temporary storage bin is used for storing raw materials of battery pole pieces. The feeding mechanism is arranged below the temporary storage bin and used for conveying the raw materials in the temporary storage bin to the mixing mechanism. And the mixing mechanism is arranged at the downstream of the feeding mechanism and is used for stirring and mixing the raw materials and the solvent and outputting the mixture outwards. And the mixing device is arranged at the downstream of the primary powder mixing device and is used for stirring and mixing the mixture and then outputting the mixture outwards. The rolling device is arranged at the downstream of the mixing device and comprises multiple stages of rolling mechanisms, and the multiple stages of rolling mechanisms are used for rolling by adopting a helical tooth roller, a corrugated roller and a flat roller respectively. According to the production system, a plurality of process devices are integrated, so that the production efficiency is improved; and full mixing and full calendaring of the battery pole piece material can be ensured, and the product quality of the battery pole piece can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a battery electrode production system. Background Technology

[0002] Currently, energy transition is imminent, and renewable energy has become a key focus of research and development for various countries. As a result, large-scale energy storage systems have emerged, which can store and release intermittent energy generated from renewable natural resources such as solar, wind, and tidal energy and connect it to the power grid, enabling users to obtain stable, safe, and efficient clean energy.

[0003] Currently, the main energy storage technologies include electrochemical energy storage, mechanical energy storage, chemical energy storage, electrical energy storage, and phase change energy storage. Electrochemical energy storage is primarily achieved through energy storage batteries. In the manufacturing process of energy storage batteries, a dry-process battery electrode production method is typically used. This process does not use solvents in the preparation of battery electrodes; instead, it directly mixes the main powder material, conductive agent, and solid binder. The uniformity of this mixing directly affects the final quality of the battery electrode. Existing electrode production processes cannot adequately guarantee the uniform mixing of the main powder material with other substances, thus making it difficult to ensure the quality of the final product. Utility Model Content

[0004] One objective of this invention is to overcome the shortcomings of existing technologies and provide a battery electrode production system. To solve the aforementioned technical problems, this invention adopts the following technical solution:

[0005] A battery electrode production system, comprising:

[0006] The preliminary powder mixing device includes a buffer bin, a feeding mechanism, and a mixing mechanism. The buffer bin is used to store the raw materials for battery electrodes, and a discharge port is provided at the bottom of the buffer bin. The feeding mechanism is located below the buffer bin, and the feed end of the feeding mechanism is connected to the discharge port. The feeding mechanism is used to transport the raw materials in the buffer bin to the mixing mechanism. The mixing mechanism is located downstream of the feeding mechanism and is provided with a liquid inlet for adding solvent. The mixing mechanism is used to stir and mix the raw materials and solvent and output them externally.

[0007] A mixing device is located downstream of the preliminary mixing device. The mixing device includes at least one mixing chamber, which is equipped with a stirring component. The mixing chamber is used to receive the mixture after it has been stirred and mixed by the mixing mechanism, and to output the mixture after stirring and mixing it.

[0008] The rolling device is located downstream of the mixing device. The rolling device includes a multi-stage rolling mechanism, which uses helical toothed rollers, corrugated rollers, and flat rollers for rolling. The rolling device is used to calender the mixture output from the mixing device.

[0009] In one embodiment, the feeding mechanism includes a feeding chamber and a spiral conveying rod disposed in the feeding chamber. A first inlet for communicating with a discharge port is opened at the top of one end of the feeding chamber, and a first outlet is opened at the bottom of the other end of the feeding chamber.

[0010] The screw conveyor is rotatably mounted in the feeding chamber. The screw conveyor is used to convey the raw material from the first inlet to the first outlet so that the raw material enters the mixing mechanism through the first outlet.

[0011] In one embodiment, the mixing mechanism includes a mixing chamber and a spiral stirring rod disposed in the mixing chamber. A second inlet for receiving raw materials output by the feeding mechanism is opened at the top of one end of the mixing chamber, and a second outlet is opened at the bottom of the other end of the mixing chamber. A liquid inlet is disposed through the top wall of the mixing chamber.

[0012] The spiral stirring rod is rotatably installed in the mixing chamber and is used to stir and mix the raw materials and solvents before outputting them to the outside through the second discharge port.

[0013] In one embodiment, the buffer bin is a conical structure with a circular cross-section, and the inner diameter of the buffer bin decreases from top to bottom.

[0014] In one embodiment, a third inlet is provided at the top of one end of the mixing tank for receiving the mixture output by the mixing mechanism, and a third outlet is provided at the bottom of the other end of the mixing tank.

[0015] The mixing assembly includes at least one pair of mixing shafts, which are parallel to each other and spaced apart. Each mixing shaft has multiple mixing blades arranged in a spiral pattern on its outer peripheral sidewall. When the mixing shafts rotate relative to each other, they can mix the mixture in the mixing tank and output it to the outside through the third discharge port.

[0016] In one embodiment, the multi-stage rolling mechanism includes a first-stage rolling mechanism, a second-stage rolling mechanism and a third-stage rolling mechanism arranged in sequence. The first-stage rolling mechanism includes at least one pair of helical toothed rollers, each pair of helical toothed rollers being parallel to each other and spaced apart, for calendering the mixture output from the mixing device.

[0017] The secondary roll pressing mechanism includes at least one pair of corrugated rolls, which are parallel to each other and spaced apart, for calendering the mixture after calendering by the primary roll pressing mechanism;

[0018] The three-stage rolling mechanism includes at least one pair of flat rollers, which are parallel to each other and spaced apart, for calendering the mixture after the two-stage rolling mechanism.

[0019] In one embodiment, the primary rolling mechanism includes a pair of helical toothed rollers, the secondary rolling mechanism includes two pairs of corrugated rollers, and the tertiary rolling mechanism includes seven pairs of flat rollers.

[0020] In one embodiment, the battery electrode production system further includes a buffer device disposed between the mixing device and the rolling device, the buffer device being used to temporarily store the mixture mixed by the mixing device.

[0021] In one embodiment, the battery electrode production system further includes a powder supply device located upstream of the preliminary powder mixing device. The powder supply device includes a batching mechanism and a conveying mechanism. The batching mechanism is used to prepare the raw materials, and the conveying mechanism is used to transport the raw materials prepared by the batching mechanism to the buffer bin.

[0022] In one embodiment, the battery electrode production system further includes:

[0023] The compounding device is located downstream of the rolling device. The compounding device is used to compound the mixture formed by the rolling device onto the current collector to form the battery electrode.

[0024] A drying device is located downstream of the composite device and is used to dry the battery electrode sheets that have been composited by the composite device.

[0025] The winding device is located downstream of the drying device and is used to wind up the dried and shaped battery electrode sheets.

[0026] In one embodiment, the battery electrode production system further includes an unwinding device located upstream of the composite device. The unwinding device is used to unwind the current collector so that it can enter the composite device and be composited with the mixture.

[0027] In one embodiment, the battery electrode production system further includes a traction device disposed between the drying device and the winding device, the traction device being used to pull the dried and shaped battery electrode to the winding device for winding.

[0028] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0029] In this invention, the battery electrode production system includes a preliminary powder feeding device, a mixing device, and a rolling device. The preliminary powder feeding device is used to perform preliminary mixing of raw materials and solvent liquids. The mixing device is used to thoroughly stir and mix the pre-mixed mixture. The rolling device is used to calender the thoroughly mixed mixture. This production system integrates the preliminary powder feeding, thorough mixing, and rolling processes into one unit, simplifying the turnaround process and improving production efficiency.

[0030] Furthermore, the preliminary mixing device enables initial mixing and discharge of raw materials and liquid solvents, while the mixing device ensures thorough mixing and discharge of the mixture. This guarantees sufficient mixing of the battery electrode materials, thereby improving the product quality of the battery electrodes.

[0031] Furthermore, by setting up a multi-stage rolling mechanism, the mixture can be fully and repeatedly rolled through toothed rollers, corrugated rollers, and flat rollers. This ensures sufficient rolling of the battery electrode material, thereby improving the product quality of the battery electrodes. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a battery electrode production system according to an embodiment of the present invention.

[0033] Figure 2 yes Figure 1 The diagram shows the production system as viewed along the direction of arrow A.

[0034] Figure 3 yes Figure 1 The diagram shows the structure of the preliminary powder mixing device in the production system.

[0035] Figure 4 yes Figure 1 A schematic diagram of the internal structure of the mixing device in the production system shown.

[0036] Figure 5 yes Figure 1 The diagram shows the structure of the primary roller pressing mechanism in the production system.

[0037] Figure 6 yes Figure 5 A schematic diagram of the corrugated roller structure shown.

[0038] Figure 7 yes Figure 1 The diagram shows the structure of the two-stage roller pressing mechanism in the production system.

[0039] Figure 8 yes Figure 7 The diagram shows the structure of the helical toothed roller.

[0040] The annotations in the attached figures are explained as follows:

[0041] 10-Powder feeding device; 11-Batching mechanism; 12-Conveying mechanism;

[0042] 20 - Preliminary mixing device; 21 - Buffer bin; 211 - Inlet; 212 - Outlet; 22 - Feeding mechanism; 221 - Feeding chamber; 222 - Screw conveyor; 23 - Mixing mechanism; 231 - Mixing chamber; 232 - Screw agitator;

[0043] 30 - Mixing device; 31 - Mixing box; 32 - Stirring assembly; 321 - Stirring shaft;

[0044] 40 - Roller pressing device; 41 - Primary roller pressing mechanism; 411 - Helical toothed roller; 42 - Secondary roller pressing mechanism; 421 - Corrugated roller; 43 - Tertiary roller pressing mechanism;

[0045] 50 - Composite device; 51 - Unwinding device;

[0046] 60 - Drying device; 70 - Winding device; 80 - Traction device. Detailed Implementation

[0047] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0048] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] Please see Figure 1 and Figure 2As shown, the battery electrode production system of this utility model includes a powder supply device 10, a preliminary powder mixing device 20, a mixing device 30, a rolling device 40, a composite device 50, a drying device 60, and a winding device 70. The powder supply device 10 is used to prepare and supply raw materials for producing battery electrodes. The preliminary powder mixing device 20 is used to perform preliminary mixing of raw materials and solvent liquids, etc. The mixing device 30 is used to thoroughly stir and mix the pre-mixed mixture. The rolling device 40 is used to calender the thoroughly mixed mixture. The composite device 50 is used to composite the calendered film-like mixture with a current collector to form a battery electrode. The drying device 60 is used to dry and shape the composite battery electrode. The winding device 70 is used to wind the dried and shaped battery electrode.

[0051] For example, such as Figure 1 As shown, the powder supply device 10 may include a batching mechanism 11 and a conveying mechanism 12. The batching mechanism 11 is used to prepare raw materials. The batching mechanism 11 may include a feeder and a vibrating screen. The feeder is used to add various raw materials to the vibrating screen according to the specified ratio. The vibrating screen is used to screen and separate the raw materials, preventing large particles from entering subsequent processes.

[0052] The conveying mechanism 12 is used to convey the raw materials configured by the batching mechanism 11 to the preliminary mixing device 20. For example, the conveying mechanism 12 may include a pumping pipe and a drive pump body, the pumping pipe being able to connect the batching mechanism 11 and the preliminary mixing device 20, and the drive pump body being used to drive the flow of raw materials in the pumping pipe.

[0053] It is understood that in other embodiments, the powder supply device 10 may also have other structural forms, depending on the specific circumstances.

[0054] See Figure 3 As shown, the preliminary mixing device 20 may include a buffer bin 21, a feeding mechanism 22, and a mixing mechanism 23. The buffer bin 21 is used to receive and store the raw materials supplied by the powder supply device 10. In this application, the buffer bin 21 is vertically installed.

[0055] like Figure 3 As shown, the top of the buffer bin 21 may be provided with a feed inlet 211 for feeding, and the pumping pipe mentioned above may be connected to the feed inlet 211. The bottom of the buffer bin 21 is provided with a discharge port 212.

[0056] In one embodiment, the buffer chamber 21 can be a conical structure with a circular cross-section. The inner diameter of the buffer chamber 21 decreases from top to bottom. The inlet 211 is located at the top of the buffer chamber 21, where the inner diameter is larger, to facilitate material feeding. The outlet 212 is located at the bottom of the buffer chamber 21, where the inner diameter is smallest, to facilitate control of the quantity and speed of material feeding.

[0057] For example, a weighing sensor may also be provided on the buffer bin 21, which can detect the weight of the buffer bin 21. This makes it easier to obtain the output of raw materials in the bin, so as to control the quantity and speed of material feeding.

[0058] like Figure 3 As shown, the feeding mechanism 22 is located below the buffer bin 21, and its main function is to transport the raw materials in the buffer bin 21 to the mixing mechanism 23. The feed end of the feeding mechanism 22 is connected to the discharge port 212.

[0059] In this application, the feeding mechanism 22 can be a spiral output structure. For example, such as Figure 3 As shown, the feeding mechanism 22 may include a feeding chamber 221 and a screw conveyor 222 disposed within the feeding chamber 221. A first feed port for communicating with a discharge port 212 is provided at the top of one end of the feeding chamber 221. Specifically, the discharge port 212 may be arranged vertically corresponding to the second feed port.

[0060] A first discharge port is provided at the bottom of the other end of the feeding chamber 221. The first discharge port is used to communicate with the mixing mechanism 23. A screw conveyor 222 is rotatably disposed in the feeding chamber 221. The screw conveyor 222 may include a rotating shaft and helical blades disposed on the rotating shaft. The screw conveyor 222 is used to convey raw materials from the first inlet to the first discharge port, so that the raw materials enter the mixing mechanism 23 through the first discharge port.

[0061] In this embodiment, the feeding mechanism 22, which is equipped with a spiral conveying rod 222, can not only quantitatively and controllably convey the raw materials in the buffer bin 21 to the mixing mechanism 23, but also stir and mix the raw materials during the conveying process, thereby achieving continuous mixing and feeding, which is beneficial to improving the mixing uniformity of the raw materials.

[0062] It is understood that in other embodiments, the feeding mechanism 22 may also have other structural forms, depending on the specific circumstances.

[0063] like Figure 3 As shown, the mixing mechanism 23 is located downstream of the feeding mechanism 22, and its main function is to stir and mix the raw materials and solvent and output them externally. The mixing mechanism 23 is also provided with a liquid inlet for adding solvent. In this application, the battery electrode production process adopts a semi-dry method, so it is necessary to add a small amount of liquid solvent to the raw materials and to fully mix the liquid solvent with the raw material powder. The content of the added liquid solvent can be approximately 10%.

[0064] See Figure 3In one embodiment, the mixing mechanism 23 may include a mixing chamber 231 and a spiral stirring rod 232 disposed within the mixing chamber 231. A second inlet is provided at the top of one end of the mixing chamber 231 for receiving raw materials output by the feeding mechanism 22. Specifically, the second inlet may communicate with the first outlet mentioned above. More specifically, the first outlet may be arranged vertically corresponding to the second inlet.

[0065] A second discharge port is provided at the bottom of the other end of the mixing chamber 231. The second discharge port is used to communicate with the mixing device 30. The liquid inlet can be provided through the top wall of the mixing chamber 231. The liquid inlet can be located on one side of the second inlet.

[0066] The spiral stirring rod 232 is rotatably disposed within the mixing chamber 231 and is used to stir and mix the raw materials and solvent before discharging them outward through the second outlet. For example, the spiral stirring rod 232 may include a rotating shaft and spiral blades and stirring blades disposed on the rotating shaft.

[0067] In this embodiment, the mixing mechanism 23, equipped with a spiral stirring rod 232, can not only fully mix the raw materials and liquid solvent in the mixing chamber 231, but also simultaneously discharge the mixture through the second outlet. Thus, the mixing mechanism 23 can achieve continuous mixing and discharging, which helps improve the uniformity of the mixture.

[0068] It is understood that in other embodiments, the mixing mechanism 23 may also have other structural forms, depending on the specific circumstances.

[0069] See Figure 2 and Figure 4 As shown, the mixing device 30 is located downstream of the preliminary mixing device 20. The mixing device 30 includes at least one mixing chamber 31, and a stirring assembly 32 is provided inside the mixing chamber 31. For example, the mixing device 30 may include two mixing chambers 31, each of which is provided with a stirring assembly 32. Each mixing chamber 31 and its internal structure may be identical. The mixture after preliminary mixing by the preliminary mixing device 20 may first enter one of the mixing chambers 31 for further mixing, and then enter the other mixing chamber 31 for further mixing.

[0070] It is understood that in other embodiments, the mixing device 30 may also have one or more mixing tanks 31, depending on the specific circumstances.

[0071] See Figure 4In one embodiment, the mixing chamber 31 can be structured as follows: a third inlet is provided at the top of one end of the mixing chamber 31 for receiving the mixture output by the mixing mechanism 23, and a third outlet is provided at the bottom of the other end of the mixing chamber 31. The third outlet can be connected to the second outlet mentioned above. The third outlet can be connected to the roller pressing device 40.

[0072] The structure of the stirring assembly 32 can be as follows: the stirring assembly 32 includes at least one pair of stirring shafts 321, each pair of stirring shafts 321 being parallel to each other and spaced apart, and each stirring shaft 321 having multiple stirring blades arranged in a spiral pattern on its outer peripheral sidewall. When each pair of stirring shafts 321 rotates relative to each other, it can stir the mixture in the mixing tank 31 and output it to the outside through the third discharge port.

[0073] In this embodiment, the stirring assembly 32 not only enables thorough mixing of the mixture within the mixing chamber 31, but also allows for simultaneous mixing and discharge of the mixture through the third outlet. This ensures continuous mixing and discharge within each mixing chamber 31, improving the uniformity of the mixture.

[0074] It is understood that in other embodiments, the stirring assembly 32 may also have other structural forms. For example, each stirring shaft 321 may have multiple stirring teeth or stirring nails arranged in a spiral on its outer peripheral sidewall, depending on the specific situation.

[0075] See Figure 1 As shown, the roller pressing device 40 is located downstream of the mixing device 30. The roller pressing device 40 includes a multi-stage roller pressing mechanism. For example, the multi-stage roller pressing mechanism may include a first-stage roller pressing mechanism 41, a second-stage roller pressing mechanism 42, and a third-stage roller pressing mechanism 43 arranged sequentially. The first-stage roller pressing mechanism 41 may employ a helical toothed roller 411. The second-stage roller pressing mechanism 42 may employ a corrugated roller 421. The third-stage roller pressing mechanism 43 may employ a flat roller.

[0076] See Figure 5 In one embodiment, the primary rolling mechanism 41 includes at least one pair of helical toothed rollers 411, which are parallel to each other and spaced apart, for calendering the mixture output from the mixing device 30. The gap between the pairs of helical toothed rollers 411 can be adjusted according to the production process.

[0077] like Figure 6 As shown, the roller surface of the helical toothed roller 411 is generally formed with helical teeth that are inclined relative to the roller axis. When the mixture is extruded through the gap between a pair of helical toothed rollers 411, the helical toothed roller 411 can produce extrusion, tearing and stretching effects on the mixture in multiple directions, thereby fully grinding and calendering the mixture and improving the calendering effect of the mixture.

[0078] For example, the primary rolling mechanism 41 may include a pair of helical toothed rollers 411. Of course, in other embodiments, the primary rolling mechanism 41 may also be provided with multiple pairs of helical toothed rollers 411 as needed.

[0079] See Figure 7 The secondary rolling mechanism 42 includes at least one pair of corrugated rollers 421, which are parallel to each other and spaced apart, for calendering the mixture after calendering by the primary rolling mechanism 41. The gap between the pairs of corrugated rollers 421 can be adjusted according to the production process.

[0080] like Figure 8 As shown, the surface of the corrugated roller 421 is generally formed with corrugated teeth in a concave-convex shape. When the mixture is extruded through the gap between a pair of corrugated rollers 421, the corrugated rollers 421 can produce multiple directions of squeezing, friction, and stretching effects on the mixture, thereby improving the calendering effect of the mixture.

[0081] For example, the secondary rolling mechanism 42 may include two pairs of corrugated rollers 421. Of course, in other embodiments, the secondary rolling mechanism 42 may also be provided with one or more pairs of corrugated rollers 421 as needed.

[0082] The third-stage rolling mechanism 43 includes at least one pair of flat rollers, which are parallel to each other and spaced apart, for calendering the mixture after calendering by the second-stage rolling mechanism 42. The gap between the pairs of flat rollers can be adjusted according to the production process.

[0083] It is understandable that the surface of a flat roller is a smooth plane. When the mixture is extruded through the gap between a pair of flat rollers, the flat rollers can fully compress and extend the mixture, and facilitate the compaction of the mixture to form a thin film.

[0084] like Figure 2 As shown, the three-stage roller pressing mechanism 43 may include seven pairs of flat rollers. Among these pairs, the gap between the upstream pair of flat rollers can be larger than the gap between the downstream pair, thereby achieving the purpose of gradually extending and compacting the mixture. Of course, in other embodiments, the three-stage roller pressing mechanism 43 may also be equipped with one or more pairs of flat rollers as needed.

[0085] It is understood that in other embodiments, the roller pressing device 40 may also have other structural forms, depending on the specific circumstances.

[0086] In one embodiment of this application, the battery electrode production system further includes a buffer device (not shown) disposed between the mixing unit 30 and the rolling unit 40. The buffer device is used to temporarily store the mixture prepared by the mixing unit 30. For example, the buffer device can be a belt conveyor. The belt conveyor not only transports the mixture output from the mixing unit 30 to the rolling unit 40, but also temporarily stores the mixture. When a problem occurs in a subsequent unit, the mixture can be returned to the buffer device for temporary storage. When the mixture is reused in a subsequent unit, the buffer device can directly transfer the mixture to the rolling unit 40 via the belt conveyor, thereby saving time and improving the production efficiency of the production system.

[0087] See Figure 2 As shown, the composite device 50 is located downstream of the rolling device 40 and is used to composite the mixture formed by the rolling device 40 onto the current collector to form a battery electrode. Specifically, the composite device 50 can bond and coat the thin film mixture from the rolling device 40 onto the current collector (e.g., copper foil, aluminum foil, etc.) so that the two are bonded and composited.

[0088] In one embodiment, the battery electrode production system further includes an unwinding device 51, which is disposed upstream of the composite device 50. The unwinding device 51 is used to unwind the current collector, allowing it to enter the composite device 50 and be composited with the mixture. The unwinding device 51 can employ various types of unwinding structures, such as electric or rotary drum unwinding, and this application does not specifically limit its application to these types.

[0089] like Figure 1 As shown, the drying device 60 is located downstream of the composite device 50. For example, the drying device 60 can use pure hot air, infrared heating, or a combination of both to dry and shape the composite battery electrodes. It is understood that the drying device 60 is not limited to hot air, infrared, or other combinations, as long as it does not affect product performance and can meet production requirements to a certain extent.

[0090] like Figure 1 As shown, the winding device 70 is located downstream of the drying device 60 and is used to wind up the dried and formed battery electrode sheets. The winding device 70 can employ various types of winding structures, such as an electric winding drum, and this application does not specifically limit its application.

[0091] See Figure 1 As shown, in one embodiment of this application, the battery electrode production system further includes a traction device 80 disposed between the drying device 60 and the winding device 70. The traction device 80 can be used to pull the dried and formed battery electrode to the winding device 70 for winding. The traction device 80 can employ various types of traction structures such as clamping rollers, and this application does not specifically limit its application to these types.

[0092] The battery electrode production system of this application allows the various devices to be linked together via transmission pipes, conveyor belts, or other transmission equipment. These devices can be fixed or non-fixed.

[0093] See Figure 2 As shown, for example, since the unwinding device 51 and the compounding device 50 need to occupy a certain height space, and in order to facilitate the bonding and compounding of the mixture and the current collector, it is preferable that the film-shaped mixture formed by the roll pressing device 40 falls from a higher position. Therefore, the preliminary powder mixing device 20, the mixing device 30 and the roll pressing device 40 can be arranged at a higher position, while the compounding device 50, the drying device 60 and the winding device 70 can be arranged at a lower position, depending on the specific situation.

[0094] The production process of the battery electrode production system in this embodiment is roughly as follows:

[0095] The raw materials for the battery electrodes are fed into the buffer chamber 21 of the preliminary mixing device 20 via the powder supply device 10. The raw materials in the buffer chamber 21 enter the feeding chamber 221 of the feeding mechanism 22 through the bottom discharge port 212. Under the mixing and conveying action of the screw conveyor 222, the raw material powder is fully mixed and can then enter the mixing chamber 231 of the mixing mechanism 23 through the first discharge port. Simultaneously, at the mixing mechanism 23, liquid solvent is added to the mixing chamber 231 through the liquid inlet. Under the mixing and conveying action of the screw stirring rod 232, the raw material powder and liquid solvent are fully mixed and can then enter the mixing device 30 through the second discharge port.

[0096] At the mixing device 30, the mixture of raw material powder and liquid solvent can be further fully mixed under the action of the stirring component 32 and then output to the roller pressing device 40.

[0097] At the rolling device 40, the mixture is calendered multiple times sequentially through a pair of oblique toothed rollers 411, two pairs of corrugated rollers 421, and multiple pairs of flat rollers. The calendered film-like mixture is then conveyed to the composite device 50 to be composited with a current collector to form a battery electrode. The battery electrode formed by the composite device 50 is then conveyed to the drying device 60 for drying. The battery electrode formed by drying in the drying device 60 can be drawn by the traction device 80 to the winding device 70 for winding.

[0098] The battery electrode production system of this application can be comprehensively controlled by a single control system, realizing the automation and process controllability of each production process of battery electrodes, thereby improving production efficiency.

[0099] The battery electrode production system proposed in this application integrates processes such as material feeding, preliminary mixing, thorough mixing, rolling, compounding, and drying into one system, which simplifies the turnover process and helps improve production efficiency.

[0100] This application discloses a battery electrode production system that uses a preliminary mixing device to continuously feed raw materials and perform initial mixing of the raw materials with a liquid solvent. A further mixing device ensures thorough mixing and continuous discharge of the mixture. This guarantees sufficient mixing of the battery electrode materials, thereby improving the product quality of the battery electrodes.

[0101] The battery electrode production system described in this application, through a multi-stage rolling mechanism, allows the mixed material to undergo thorough and multiple rolling processes, sequentially passing through toothed rollers, corrugated rollers, and flat rollers. This ensures sufficient rolling of the battery electrode material, thereby improving the product quality of the battery electrodes.

[0102] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0103] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A battery pole piece production system characterized by, The application relates to a battery pole piece production device. The device comprises a preliminary powder mixing device, a mixing device and a roller pressing device. The preliminary powder mixing device comprises a buffer bin, a feeding mechanism and a mixing mechanism. The buffer bin is used for storing raw materials of a battery pole piece.

2. The battery pole piece production system of claim 1, wherein, The bottom of the buffer bin is provided with a discharging port. The feeding mechanism is arranged below the buffer bin.

3. The battery pole production system of claim 1, wherein, The feeding end of the feeding mechanism is communicated with the discharging port. The feeding mechanism is used for conveying the raw materials in the buffer bin to the mixing mechanism.

4. The battery pole production system of claim 1, wherein, The mixing mechanism is arranged downstream of the feeding mechanism.

5. The battery pole production system of claim 1, wherein, The mixing mechanism is provided with a liquid adding port for adding a solvent. The mixing mechanism is used for stirring and mixing the raw materials and the solvent and outputting the mixed materials.

6. The battery pole production system of claim 1, wherein, The mixing device is arranged downstream of the preliminary powder mixing device. The mixing device comprises at least one mixing box. The mixing box is provided with a stirring assembly. The mixing box is used for receiving the mixed materials stirred and mixed by the mixing mechanism and outputting the mixed materials after stirring and mixing. The roller pressing device is arranged downstream of the mixing device. The roller pressing device comprises a multi-stage roller pressing mechanism. The multi-stage roller pressing mechanism comprises a first-stage roller pressing mechanism, a second-stage roller pressing mechanism and a third-stage roller pressing mechanism arranged in sequence. The first-stage roller pressing mechanism comprises at least one pair of bevel gear rollers. Each pair of the bevel gear rollers is parallel and spaced. The first-stage roller pressing mechanism is used for calendering the mixed materials output by the mixing device. The feeding mechanism comprises a feeding chamber and a spiral conveying rod arranged in the feeding chamber. The top of one end of the feeding chamber is provided with a first feeding port communicated with the discharging port. The bottom of the other end of the feeding chamber is provided with a first discharging port. The spiral conveying rod is rotatably arranged in the feeding chamber. The spiral conveying rod is used for conveying the raw materials from the first feeding port to the first discharging port. The mixing mechanism comprises a mixing chamber and a spiral stirring rod arranged in the mixing chamber. The top of one end of the mixing chamber is provided with a second feeding port for receiving the raw materials output by the feeding mechanism. The bottom of the other end of the mixing chamber is provided with a second discharging port. The liquid adding port is arranged through the top cavity wall of the mixing chamber. The spiral stirring rod is rotatably arranged in the mixing chamber. The spiral stirring rod is used for stirring and mixing the raw materials and the solvent and outputting the mixed materials through the second discharging port. The buffer bin is a conical structure with a circular cross section. The inner diameter of the buffer bin decreases from top to bottom. The top of one end of the mixing box is provided with a third feeding port for receiving the mixed materials output by the mixing mechanism. The bottom of the other end of the mixing box is provided with a third discharging port. The stirring assembly comprises at least one pair of stirring shafts. Each pair of the stirring shafts is parallel and spaced. Each stirring shaft is provided with a plurality of stirring blades arranged in a spiral shape on the outer circumferential side wall. Each pair of the stirring shafts is relatively rotatable. The stirring assembly is used for stirring the mixed materials in the mixing box and outputting the mixed materials through the third discharging port. The multi-stage roller pressing mechanism comprises the first-stage roller pressing mechanism, the second-stage roller pressing mechanism and the third-stage roller pressing mechanism arranged in sequence. The first-stage roller pressing mechanism comprises at least one pair of bevel gear rollers. Each pair of the bevel gear rollers is parallel and spaced. The first-stage roller pressing mechanism is used for calendering the mixed materials output by the mixing device. The second-stage roller pressing mechanism comprises at least one pair of corrugated rollers. Each pair of the corrugated rollers is parallel and spaced. The second-stage roller pressing mechanism is used for calendering the mixed materials output by the first-stage roller pressing mechanism. The third-stage roller pressing mechanism comprises at least one pair of flat rollers. Each pair of the flat rollers is parallel and spaced. The third-stage roller pressing mechanism is used for calendering the mixed materials output by the second-stage roller pressing mechanism. The secondary rolling mechanism comprises at least one pair of corrugated rollers, each pair of the corrugated rollers being parallel and spaced to roll the mixed material rolled by the primary rolling mechanism. The tertiary rolling mechanism comprises at least one pair of flat rollers, each pair of the flat rollers being parallel and spaced to roll the mixed material rolled by the secondary rolling mechanism.

7. The battery pole production system of claim 6, wherein, The primary rolling mechanism comprises one pair of the bevel tooth rollers, the secondary rolling mechanism comprises two pairs of the corrugated rollers, and the tertiary rolling mechanism comprises seven pairs of the flat rollers.

8. The battery pole piece production system of any one of claims 1 to 7, wherein, The powder supply device is arranged upstream of the preliminary powder mixing device, and comprises a dosing mechanism and a conveying mechanism. The dosing mechanism is configured to dose raw materials, and the conveying mechanism is configured to convey the raw materials dosed by the dosing mechanism into the buffer bin.

9. The battery pole piece production system according to any one of claims 1 to 7, characterized by, The composite device is arranged downstream of the rolling device, and is configured to composite the mixed material rolled by the rolling device onto a current collector to form a battery pole piece.

10. The battery pole piece production system of any one of claims 1 to 7, wherein, The drying device is arranged downstream of the composite device, and is configured to dry the battery pole piece formed by the composite device. The winding device is arranged downstream of the drying device, and is configured to wind the dried battery pole piece. The unwinding device is arranged upstream of the composite device, and is configured to unwind the current collector so that the current collector can enter the composite device to be combined with the mixed material. The traction device is arranged between the drying device and the winding device, and is configured to pull the dried battery pole piece to the winding device for winding.

11. The battery pole production system of claim 10, wherein, ​ 12. The battery pole production system of claim 10, wherein, ​

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