Battery pole piece production system

Abstract

The invention 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] The present invention relates to the technical field of battery manufacturing, and in particular to a battery pole piece production system. Background Art

[0002] At present, the development of traditional energy in the world is facing serious problems of insufficient reserves and non-renewable energy. At the same time, the environmental pollution and greenhouse gas emissions caused by the combustion of fossil energy are becoming more and more serious. Therefore, energy transformation is imminent, and renewable energy has become the focus of research and development in various countries. As a result, large-scale energy storage systems have emerged, which can store and release intermittent energy generated by renewable natural resources such as solar energy, wind energy, and tidal energy and connect them to the power grid, so that users can obtain stable, safe, and efficient clean energy.

[0003] At present, the main energy storage technologies include electrochemical energy storage, mechanical energy storage, chemical energy storage, electrical energy storage and phase change energy storage. Among them, electrochemical energy storage is mainly achieved through energy storage batteries. In the production and manufacturing process of energy storage batteries, the dry process of battery pole production is usually adopted. This process does not use solvents in the process of preparing battery poles, but directly mixes the main powder material, conductive agent and solid adhesive. Among them, the mixing uniformity will directly affect the final production quality of the battery pole. The existing pole production process cannot well ensure the uniform mixing of the main powder material and other substances, making it difficult to ensure the quality of the final product. Summary of the invention

[0004] One purpose of the present invention is to solve the deficiencies in the prior art and provide a battery pole piece production system. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A battery pole piece production system, comprising:

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

[0007] A mixing device is arranged downstream of the preliminary powder mixing device, and comprises at least one mixing box, in which a stirring assembly is arranged, and the mixing box is used to receive the mixed material after being stirred and mixed by the mixing mechanism, and output the mixed material after stirring and mixing;

[0008] The rolling device is arranged downstream of the mixing device. The rolling device includes a multi-stage rolling mechanism. The multi-stage rolling mechanism uses a helical tooth roller, a corrugated roller and a flat roller for rolling. The rolling device is used to calender the mixed material output by the mixing device.

[0009] In one embodiment, the feeding mechanism includes a feeding chamber and a spiral conveying rod arranged in the feeding chamber, a first feeding port for communicating with a feeding port is opened at the top of one end of the feeding chamber, and a first discharging port is opened at the bottom of the other end of the feeding chamber;

[0010] The spiral conveying rod is rotatably arranged in the feeding chamber, and is used to convey the raw materials from the first feeding port to the first discharging port, so that the raw materials enter the mixing mechanism through the first discharging port.

[0011] In one embodiment, the mixing mechanism includes a mixing chamber and a spiral stirring rod disposed in the mixing chamber, a second feed port for receiving the raw material output by the feeding mechanism is provided at the top of one end of the mixing chamber, a second discharge port is provided at the bottom of the other end of the mixing chamber, and a liquid adding port is provided through the top wall of the mixing chamber;

[0012] The spiral stirring rod is rotatably arranged in the mixing chamber and is used for stirring and mixing the raw material and the solvent and then outputting them to the outside through the second discharge port.

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

[0014] In one embodiment, a third feed port for receiving the mixed material output by the mixing mechanism is provided at the top of one end of the mixing box, and a third discharge port is provided at the bottom of the other end of the mixing box;

[0015] The stirring assembly includes at least one pair of stirring shafts, each pair of stirring shafts are parallel to each other and spaced apart, and a plurality of stirring blades arranged in a spiral shape are respectively provided on the outer peripheral side wall of each stirring shaft. When each pair of stirring shafts rotates relative to each other, the mixture in the mixing box can be stirred and discharged outward through the third discharge port.

[0016] In one embodiment, the multi-stage rolling mechanism includes a primary rolling mechanism, a secondary rolling mechanism and a tertiary rolling mechanism arranged in sequence, the primary rolling mechanism includes at least one pair of helical toothed rollers, each pair of helical toothed rollers are parallel to each other and spaced apart, so as to calender the mixed material output by the mixing device;

[0017] The secondary rolling mechanism comprises at least one pair of corrugated rollers, each pair of corrugated rollers are parallel to each other and spaced apart, and are used to roll the mixed material rolled by the primary rolling mechanism;

[0018] The three-stage rolling mechanism comprises at least one pair of flat rollers, each pair of flat rollers is parallel to each other and spaced apart, so as to roll the mixed material rolled by the two-stage rolling mechanism.

[0019] In one embodiment, the first-stage rolling mechanism includes a pair of helical rollers, the second-stage rolling mechanism includes two pairs of corrugated rollers, and the third-stage rolling mechanism includes seven pairs of flat rollers.

[0020] In one of the embodiments, the battery pole piece production system further includes a buffer device, which is disposed between the mixing device and the rolling device, and the buffer device is used to temporarily store the mixed material mixed by the mixing device.

[0021] In one embodiment, the battery electrode production system also includes a powder supply device, which is arranged 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 convey the raw materials prepared by the batching mechanism to the buffer bin.

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

[0023] A compounding device, which is arranged downstream of the rolling device, and is used to compound the mixed material formed by the rolling device onto the current collector to form a battery pole piece;

[0024] A drying device, which is arranged downstream of the compounding device, and is used to dry the battery pole piece compounded by the compounding device;

[0025] The winding device is arranged downstream of the drying device and is used to wind up the battery pole pieces that have been dried and formed.

[0026] In one of the embodiments, the battery electrode production system further includes an unwinding device, which is disposed upstream of the compounding device, and the unwinding device is used to unwind the current collector so that the current collector can enter the compounding device to be compounded with the mixed material.

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

[0028] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0029] In the present invention, the battery pole piece production system includes a preliminary powder supply device, a mixing device and a rolling device. The preliminary powder mixing device is used to achieve preliminary mixing of raw materials and solvent liquids. The mixing device is used to fully stir and mix the preliminarily mixed mixture. The rolling device is used to calender the fully mixed mixture. The production system integrates the preliminary powder supply, full mixing and rolling process procedures, simplifies the turnover process, and improves production efficiency.

[0030] In addition, the preliminary powder mixing device can achieve preliminary mixing and discharging of the raw materials and the liquid solvent, and the mixing device can achieve full mixing and discharging of the mixed materials, thereby ensuring full mixing of the battery pole sheet materials and facilitating the improvement of the product quality of the battery pole sheets.

[0031] In addition, by setting up a multi-stage rolling mechanism, the mixed material can be fully and repeatedly rolled through the helical roller, corrugated roller and flat roller, thereby ensuring sufficient rolling of the battery pole sheet material and improving the product quality of the battery pole sheet. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 2 yes Figure 1 The production system shown is a schematic diagram viewed along the direction of arrow A.

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

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

[0036] Figure 5 yes Figure 1 The schematic diagram of the structure of the first-level rolling mechanism in the production system shown.

[0037] Figure 6 yes Figure 5 Schematic diagram of the structure of the corrugated roller in the structure shown.

[0038] Figure 7 yes Figure 1 The schematic diagram of the structure of the secondary rolling mechanism in the production system shown.

[0039] Figure 8 yes Figure 7 Schematic diagram of the structure of the helical gear roller in the structure shown.

[0040] The following are the descriptions of the reference numerals:

[0041] 10-powder supply device; 11-dosing mechanism; 12-conveying mechanism;

[0042] 20-preliminary powder mixing device; 21-buffer bin; 211-feeding port; 212-discharging port; 22-feeding mechanism; 221-feeding chamber; 222-screw conveying rod; 23-mixing mechanism; 231-mixing chamber; 232-screw stirring rod;

[0043] 30-mixing device; 31-mixing box; 32-stirring assembly; 321-stirring shaft;

[0044] 40-rolling device; 41-first-stage rolling mechanism; 411-helical roller; 42-second-stage rolling mechanism; 421-corrugated roller; 43-third-stage rolling mechanism;

[0045] 50-combining device; 51-unwinding device;

[0046] 60-drying device; 70-winding device; 80-traction device. DETAILED DESCRIPTION

[0047] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0048] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] See also Figure 1 and Figure 2As shown, the battery pole piece production system of the embodiment of the present invention includes a powder supply device 10, a preliminary powder mixing device 20, a mixing device 30, a rolling device 40, a compounding device 50, a drying device 60 and a winding device 70. Among them, the powder supply device 10 is used to configure and supply raw materials for producing battery pole pieces. The preliminary powder mixing device 20 is used to achieve preliminary mixing of raw materials and solvent liquids. The mixing device 30 is used to fully stir and mix the preliminary mixed mixture. The rolling device 40 is used to calender the fully mixed mixture. The compounding device 50 is used to compound the calendered film-shaped mixture with the collector to form a battery pole piece. The drying device 60 is used to dry and shape the compounded battery pole piece. The winding device 70 is used to wind up the dried and formed battery pole piece.

[0051] For example, 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 proportion. The vibrating screen is used to screen and subdivide the raw materials to prevent large particles from entering the subsequent process.

[0052] The conveying mechanism 12 is used to convey the raw materials prepared by the batching mechanism 11 to the preliminary powder mixing device 20. For example, the conveying mechanism 12 may include a pumping pipeline and a driving pump body, the pumping pipeline can connect the batching mechanism 11 and the preliminary powder mixing device 20, and the driving pump body is used to drive the raw materials in the pumping pipeline to flow.

[0053] It can be understood that in other embodiments, the powder supply device 10 can also be of other structural forms, depending on the specific situation.

[0054] See also Figure 3 As shown, the preliminary powder 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 the present application, the buffer bin 21 is installed vertically.

[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 pipeline 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 bin 21 may be a conical structure with a circular cross section. The inner diameter of the buffer bin 21 decreases from top to bottom. The feed port 211 is located at the top of the buffer bin 21 where the inner diameter is larger, which is convenient for feeding. The discharge port 212 is located at the bottom of the buffer bin 21 where the inner diameter is the smallest, so that the amount and speed of discharge can be easily controlled.

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

[0058] like Figure 3 As shown, the feeding mechanism 22 is arranged below the buffer bin 21, and is mainly used to transport the raw materials in the buffer bin 21 to the mixing mechanism 23. The feeding end of the feeding mechanism 22 is connected to the feeding port 212.

[0059] In the present application, the feeding mechanism 22 may be a spiral output structure. Figure 3 As shown, the feeding mechanism 22 may include a feeding chamber 221 and a screw conveying rod 222 disposed in the feeding chamber 221. A first feeding port for communicating with the feeding port 212 is provided at the top of one end of the feeding chamber 221. Specifically, the feeding port 212 may be arranged correspondingly with the second feeding port up and down.

[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. The screw conveying rod 222 is rotatably disposed in the feeding chamber 221. The screw conveying rod 222 may include a rotating shaft and a spiral blade disposed on the rotating shaft. The screw conveying rod 222 is used to convey the raw material from the first feeding port to the first discharge port, so that the raw material enters the mixing mechanism 23 through the first discharge port.

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

[0062] It can be understood that in other embodiments, the feeding mechanism 22 can also be of other structural forms, depending on the specific situation.

[0063] like Figure 3 As shown, the mixing mechanism 23 is arranged downstream of the feeding mechanism 22, and is mainly used to mix the raw material and the solvent and output them to the outside. The mixing mechanism 23 is also provided with a liquid adding port for adding the solvent. In the present application, the production process of the battery pole piece adopts a semi-dry method, so a small amount of liquid solvent needs to be added to the raw material, and the liquid solvent needs to be fully mixed with the raw material powder. Among them, the content of the added liquid solvent can be about 10%.

[0064] See also Figure 3In one embodiment, the mixing mechanism 23 may include a mixing chamber 231 and a spiral stirring rod 232 disposed in the mixing chamber 231. A second feed port for receiving the raw material output by the feeding mechanism 22 is provided at the top of one end of the mixing chamber 231. Specifically, the second feed port may be connected to the first discharge port mentioned above. More specifically, the first discharge port may be arranged correspondingly to the second feed port up and down.

[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 addition port may be provided through the top wall of the mixing chamber 231. The liquid addition port may be located on one side of the second feed port.

[0066] The spiral stirring rod 232 is rotatably disposed in the mixing chamber 231 and is used to stir and mix the raw material and the solvent and then output them to the outside through the second discharge port. For example, the spiral stirring rod 232 may include a rotating shaft and a spiral blade and a stirring blade disposed on the rotating shaft.

[0067] In this embodiment, the mixing mechanism 23 equipped with the spiral stirring rod 232 can not only fully stir and mix the raw materials and the liquid solvent in the mixing chamber 231, but also achieve the purpose of discharging the mixed material through the second discharge port while mixing. Therefore, the mixing mechanism 23 can achieve continuous mixing and discharging, which is conducive to improving the mixing uniformity of the mixed material.

[0068] It can be understood that in other embodiments, the mixing mechanism 23 can also be of other structural forms, depending on the specific situation.

[0069] See also Figure 2 and Figure 4 As shown, the mixing device 30 is arranged downstream of the preliminary powder mixing device 20. The mixing device 30 includes at least one mixing box 31, and a stirring assembly 32 is arranged in the mixing box 31. For example, the mixing device 30 may include two mixing boxes 31, and a stirring assembly 32 is arranged in each mixing box 31. Each mixing box 31 and its internal structure may be the same structure. The mixed material after preliminary mixing by the preliminary powder mixing device 20 may first enter one of the mixing boxes 31 for mixing, and then enter the other mixing box 31 for mixing.

[0070] It can be understood that in other embodiments, the mixing device 30 may also include one mixing box 31 or multiple mixing boxes 31, depending on the specific situation.

[0071] See also Figure 4In one embodiment, the structure of the mixing box 31 can be: a third feed port for receiving the mixed material output by the mixing mechanism 23 is provided at the top of one end of the mixing box 31, and a third discharge port is provided at the bottom of the other end of the mixing box 31. The third feed port can be connected to the second discharge port mentioned above. The third discharge port can be used to connect to the roller pressing device 40.

[0072] The structure of the stirring assembly 32 can be: the stirring assembly 32 includes at least one pair of stirring shafts 321, each pair of stirring shafts 321 is parallel to each other and spaced apart, and a plurality of stirring blades arranged in a spiral shape are respectively provided on the peripheral side wall of each stirring shaft 321. When each pair of stirring shafts 321 rotates relative to each other, the mixed material in the mixing box 31 can be stirred and discharged to the outside through the third discharge port.

[0073] In this embodiment, the stirring assembly 32 can not only achieve the purpose of fully stirring and mixing the mixed material in the mixing box 31, but also achieve the purpose of outputting the mixed material to the outside through the third discharge port while mixing. Therefore, each mixing box 31 can achieve continuous mixing and discharging, which is conducive to improving the mixing uniformity of the mixed material.

[0074] It can be understood that in other embodiments, the stirring assembly 32 can also have other structural forms. For example, the outer peripheral side wall of each stirring shaft 321 can be respectively provided with a plurality of stirring teeth or stirring pins arranged in a spiral shape, and the specific structure can be determined according to the circumstances.

[0075] See also Figure 1 As shown, the rolling device 40 is arranged downstream of the mixing device 30. The rolling device 40 includes a multi-stage rolling mechanism. For example, the multi-stage rolling mechanism may include a primary rolling mechanism 41, a secondary rolling mechanism 42, and a tertiary rolling mechanism 43 arranged in sequence. Among them, the primary rolling mechanism 41 may use a helical toothed roller 411. The secondary rolling mechanism 42 may use a corrugated roller 421. The tertiary rolling mechanism 43 may use a flat roller.

[0076] See also Figure 5 In one embodiment, the primary rolling mechanism 41 includes at least one pair of helical rollers 411, each pair of helical rollers 411 is parallel to each other and spaced apart, so as to calender the mixed material output by the mixing device 30. The gap between each pair of helical 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 inclined relative to the roller axial direction. When the mixed material is extruded through the gap between a pair of helical toothed rollers 411, the helical toothed rollers 411 can produce extrusion, tearing and stretching effects on the mixed material in multiple directions, so that the mixed material can be fully ground and calendered, thereby improving the calendering effect on the mixed material.

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

[0079] See also Figure 7 The secondary rolling mechanism 42 includes at least one pair of corrugated rollers 421, each pair of corrugated rollers 421 is parallel to each other and spaced apart, so as to roll the mixed material rolled by the primary rolling mechanism 41. The gap between each pair of corrugated rollers 421 can be adjusted according to the production process.

[0080] like Figure 8 As shown, the roller surface of the corrugated roller 421 is generally formed with concave-convex corrugated teeth. When the mixture is extruded through the gap between a pair of corrugated rollers 421, the corrugated rollers 421 can produce multiple directions of extrusion, friction, extension and other effects on the mixture, thereby improving the calendering effect on 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 include one or more pairs of corrugated rollers 421 as required.

[0082] The three-stage rolling mechanism 43 includes at least one pair of flat rollers, each pair of flat rollers is parallel to each other and spaced apart, so as to roll the mixed material rolled by the two-stage rolling mechanism 42. The gap between each pair of flat rollers can be adjusted according to the production process.

[0083] It can be understood that the roller surface of the flat roller is a smooth plane. When the mixture is extruded through the gap between a pair of flat rollers, the flat roller can fully extrude and extend the mixture, and is conducive to compacting the mixture to form a film-like mixture.

[0084] like Figure 2 As shown, the three-stage roller pressing mechanism 43 may include seven pairs of flat rollers. Among the multiple pairs of flat rollers, the gap between the upstream pair of flat rollers may be larger than the gap between the downstream pair of flat rollers, so as to achieve the purpose of gradually extending and compacting the mixed material. Of course, in other embodiments, the three-stage roller pressing mechanism 43 may also be provided with one or more pairs of flat rollers as required.

[0085] It can be understood that in other embodiments, the rolling device 40 can also be of other structural forms, depending on the specific situation.

[0086] In one embodiment of the present application, the battery electrode production system also includes a cache device (not shown) arranged between the mixing device 30 and the roller pressing device 40. The cache device is used to temporarily store the mixture mixed by the mixing device 30. By way of example, the cache device can be a belt conveyor. The belt conveyor can not only achieve the purpose of conveying the mixture output by the mixing device 30 to the roller pressing device 40, but also temporarily store the mixture. When a problem occurs in a subsequent device, the mixture can be returned to the cache device for temporary storage. When the subsequent device is reused, the cache device can directly transfer the mixture to the roller pressing device 40 via belt conveyor, thereby saving time and helping to improve the production efficiency of the production system.

[0087] See also Figure 2 As shown, the compounding device 50 is disposed downstream of the rolling device 40, and is used to compound the mixed material formed by the rolling device 40 onto the current collector to form a battery electrode. Specifically, the compounding device 50 can apply the thin film mixed material transmitted by the rolling device 40 to the current collector (such as copper foil, aluminum foil, etc.) to bond and compound the two.

[0088] In one embodiment, the battery electrode production system further includes an unwinding device 51, which is disposed upstream of the compounding device 50. The unwinding device 51 is used to unwind the current collector so that the current collector can enter the compounding device 50 and be compounded with the mixed material. The unwinding device 51 can adopt various types of unwinding structures such as electric or reel, and this application does not specifically limit this.

[0089] like Figure 1 As shown, the drying device 60 is disposed downstream of the composite device 50. For example, the drying device 60 can dry and form the composite battery pole piece by pure air heating, infrared heating, or a combination of pure air heating and infrared heating. It can be 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 needs to a certain extent.

[0090] like Figure 1 As shown, the winding device 70 is arranged downstream of the drying device 60, and is used to wind up the dried and formed battery pole piece. The winding device 70 can adopt various types of winding structures such as electric reels, and this application does not make specific limitations on this.

[0091] See also Figure 1 As shown, in one embodiment of the present application, the battery pole piece 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 traction the dried and formed battery pole piece to the winding device 70 for winding. Among them, the traction device 80 can adopt various types of traction structures such as clamping rollers, and the present application does not specifically limit this.

[0092] The battery pole piece production system of the present application can be linked to each other through a transmission pipeline or a transmission belt or other transmission equipment. Each device can be fixed or non-fixed.

[0093] See also 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 mixed material and the current collector, it is preferred that the film-shaped mixed material formed by the rolling device 40 can be dropped from a higher position. Therefore, the preliminary powder mixing device 20, the mixing device 30 and the rolling device 40 can be arranged at a higher position, and the compounding device 50, the drying device 60 and the winding device 70 can be arranged at a lower position, which can be determined according to the specific situation.

[0094] The production process of the battery pole piece production system of the embodiment of the present application is roughly as follows:

[0095] The raw materials of the battery pole pieces are configured and transported by the powder supply device 10 and enter the buffer bin 21 of the preliminary powder mixing device 20. The raw materials in the buffer bin 21 enter the feeding chamber 221 of the feeding mechanism 22 through the bottom discharge port 212. Under the mixing and feeding action of the spiral conveying rod 222, the raw material powder can be fully mixed and can enter the mixing chamber 231 of the mixing mechanism 23 through the first discharge port. At the same time, at the mixing mechanism 23, a liquid solvent is added to the mixing chamber 231 through the liquid adding port, and under the mixing and feeding action of the spiral stirring rod 232, the raw material powder and the liquid solvent are fully mixed and can enter the mixing device 30 through the second discharge port.

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

[0097] At the rolling device 40, the mixed material can be rolled and formed multiple times by a pair of helical rollers 411, two pairs of corrugated rollers 421 and multiple pairs of flat rollers in sequence. The film-shaped mixed material after rolling and forming can be transferred to the compounding device 50 to be compounded with the current collector to form a battery pole piece. The battery pole piece compounded and formed by the compounding device 50 is then transported to the drying device 60 for drying. The battery pole piece dried and formed by the drying device 60 can be pulled by the pulling device 80 to the winding device 70 for winding.

[0098] The battery pole piece production system of the present application can be comprehensively controlled as a whole through a set of control systems to realize the automation and process controllability of various battery pole piece production processes and improve production efficiency.

[0099] The battery pole piece production system of the present application integrates the process procedures of feeding, preliminary mixing, sufficient mixing, rolling, compounding, drying, etc., which can simplify the turnover process and help improve production efficiency.

[0100] The battery pole piece production system of the present application realizes continuous feeding of raw materials and preliminary mixing of raw materials with liquid solvent through the preliminary powder mixing device, and realizes full mixing and continuous discharge of the mixed materials through the mixing device, thereby ensuring full mixing of battery pole piece materials and facilitating improving the product quality of battery pole pieces.

[0101] The battery pole sheet production system of the present application is provided with a multi-stage rolling mechanism, so that the mixed material can be fully and repeatedly rolled through the helical tooth roller, corrugated roller and flat roller in sequence, thereby ensuring the full rolling of the battery pole sheet material, which is conducive to improving the product quality of the battery pole sheet.

[0102] The above embodiments are merely exemplary descriptions of the structures. The structures in the embodiments are not fixed combination structures. In the absence of structural conflicts, the structures in multiple embodiments can be used in any combination.

[0103] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of 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, so all changes 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 in that: include: A preliminary powder mixing device, comprising a buffer bin, a feeding mechanism and a mixing mechanism, wherein the buffer bin is used to store raw materials of battery pole pieces, and a feeding port is provided at the bottom of the buffer bin; the feeding mechanism is arranged below the buffer bin, and a feeding end of the feeding mechanism is connected to the feeding port, and the feeding mechanism is used to transport the raw materials in the buffer bin to the mixing mechanism; the mixing mechanism is arranged downstream of the feeding mechanism, and the mixing mechanism is provided with a liquid adding port for adding a solvent, and the mixing mechanism is used to stir and mix the raw materials and the solvent and output them externally; A mixing device, which is arranged downstream of the preliminary powder mixing device, and includes at least one mixing box, in which a stirring assembly is arranged, and the mixing box is used to receive the mixed material after being stirred and mixed by the mixing mechanism, and output the mixed material after stirring and mixing; A rolling device is arranged downstream of the mixing device, and the rolling device includes a multi-stage rolling mechanism, which respectively uses a helical tooth roller, a corrugated roller and a flat roller for rolling. The rolling device is used to calender the mixed material output by the mixing device.

2. The battery pole piece production system according to claim 1, characterized in that: The feeding mechanism comprises a feeding chamber and a spiral conveying rod arranged in the feeding chamber, a first feeding port for communicating with the feeding port is provided at the top of one end of the feeding chamber, and a first discharging port is provided at the bottom of the other end of the feeding chamber; The spiral conveying rod is rotatably disposed in the feeding chamber, and the spiral conveying rod is used to convey the raw materials from the first feeding port to the first discharging port, so that the raw materials enter the mixing mechanism through the first discharging port.

3. The battery pole piece production system according to claim 1, characterized in that: The mixing mechanism comprises a mixing chamber and a spiral stirring rod arranged in the mixing chamber, a second feed port for receiving the raw material output by the feeding mechanism is provided at the top of one end of the mixing chamber, a second discharge port is provided at the bottom of the other end of the mixing chamber, and the liquid adding port is provided through the top wall of the mixing chamber; The spiral stirring rod is rotatably disposed in the mixing chamber and is used to stir and mix the raw material and the solvent and then output them to the outside through the second discharge port.

4. The battery pole piece production system according to claim 1, characterized in that: The cache bin is a conical structure with a circular cross section, and the inner diameter of the cache bin decreases from top to bottom.

5. The battery pole piece production system according to claim 1, characterized in that: A third material inlet for receiving the mixed material output by the mixing mechanism is provided at the top of one end of the mixing box, and a third material outlet is provided at the bottom of the other end of the mixing box; The stirring assembly includes at least one pair of stirring shafts, each pair of the stirring shafts are parallel to each other and spaced apart, and a plurality of stirring blades arranged in a spiral are respectively provided on the outer peripheral side walls of each stirring shaft. When each pair of the stirring shafts rotates relative to each other, the mixture in the mixing box can be stirred and discharged outwardly through the third discharge port.

6. The battery pole piece production system according to claim 1, characterized in that: The multi-stage rolling mechanism comprises a primary rolling mechanism, a secondary rolling mechanism and a tertiary rolling mechanism arranged in sequence, wherein the primary rolling mechanism comprises at least one pair of helical toothed rollers, each pair of helical toothed rollers being parallel to each other and spaced apart, so as to calender the mixed material outputted from the mixing device; The secondary rolling mechanism comprises at least one pair of corrugated rollers, each pair of corrugated rollers are parallel to each other and spaced apart, so as to roll the mixed material rolled by the primary rolling mechanism; The three-stage rolling mechanism comprises at least one pair of flat rollers, each pair of flat rollers are parallel to each other and spaced apart, so as to be used for rolling the mixed material after being rolled by the two-stage rolling mechanism.

7. The battery pole piece production system according to claim 6, characterized in that: The first-stage rolling mechanism includes a pair of helical toothed rollers, the second-stage rolling mechanism includes two pairs of corrugated rollers, and the third-stage rolling mechanism includes seven pairs of flat rollers.

8. The battery pole piece production system according to any one of claims 1 to 7, characterized in that: It also includes a buffer device, which is arranged between the mixing device and the rolling device, and the buffer device is used to temporarily store the mixed material mixed by the mixing device.

9. The battery pole piece production system according to any one of claims 1 to 7, characterized in that: It also includes a powder supply device, which is arranged 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 configure the raw materials, and the conveying mechanism is used to convey the raw materials configured by the batching mechanism to the buffer bin.

10. The battery pole piece production system according to any one of claims 1 to 7, characterized in that: Also includes: A compounding device, which is arranged downstream of the rolling device, and is used to compound the mixed material formed by the rolling device onto the current collector to form a battery pole piece; A drying device, which is arranged downstream of the compounding device, and is used to dry the battery pole piece compounded by the compounding device; A winding device is arranged downstream of the drying device, and is used to wind up the battery pole pieces that have been dried and formed.

11. The battery pole piece production system according to claim 10, characterized in that: It also includes an unwinding device, which is arranged upstream of the compounding device. The unwinding device is used to unwind the current collector so that the current collector can enter the compounding device to be compounded with the mixed material.

12. The battery pole piece production system according to claim 10, characterized in that: It also includes a traction device, which is arranged between the drying device and the winding device, and the traction device is used to pull the dried and formed battery pole piece to the winding device for winding.

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