Rolling mechanism, pole piece processing device and battery production equipment
By designing a uniform roll diameter calendering roller in the roller pressing mechanism, the problem of diaphragm strips in the dry-method pole sheet processing is solved, and the production efficiency of the roller pressing process is improved.
Patent Information
- Application Number
- CN202421499913.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-27
AI Technical Summary
During the dry-form electrode sheet processing, the diaphragm is not easy to stick to the roller when it is transferred between different pressing rollers, resulting in broken belts and reducing the production efficiency of the roller pressing process.
A roller pressing mechanism is designed, including a first roller group and a second roller group. The roller diameters of each roller are equal, and the pressure can be applied evenly during the calendering and transfer process to reduce the probability of breaking the belt.
By applying uniform pressure, the adhesion of the diaphragm during the rolling process is improved, the probability of breaking the belt is reduced, and the production efficiency is improved.
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Figure CN222914816U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a rolling mechanism, a pole piece processing device and a battery production equipment. Background Art
[0002] In the battery production process, the pole piece processing technology can be divided into wet process and dry process according to whether solvent is used. Among them, the wet process uses liquid slurry, which contains a large amount of solvent. The dry process does not require the addition of any solvent, but instead prepares a powder film of a certain size by fiberizing the binder in the powder through multiple rolling, and then stretches and presses the film to be thin, and then hot presses the film and the current collector to obtain a dry pole piece.
[0003] However, in the current dry process, during the process of rolling the powder multiple times to form a film, the film is not easy to stick to the rollers and break when transferred between different rollers, resulting in low production efficiency of the rolling process. Utility Model Content
[0004] Based on this, it is necessary to provide a rolling mechanism, a pole piece processing device and a battery production equipment to address the problem that in the current process of rolling the powder multiple times to form a membrane, the membrane is not easy to stick to the rollers and break when transferred between different rollers, resulting in low production efficiency of the rolling process.
[0005] In the first aspect, the present application provides a rolling mechanism, comprising a first roller group and a second roller group, the first roller group comprising at least two calendering rollers arranged at intervals along a preset direction, the axes of the calendering rollers being parallel to each other and having equal roller diameters; the second roller group being arranged at intervals along a preset direction downstream of the first roller group, and being arranged with axes parallel to the calendering rollers; wherein each calendering roller is rotatably arranged around its own axis, and is used to calender incoming materials to form a membrane; the second roller group is rotatably arranged around its own axis, and is used to compound the calendered membrane with a current collector to form a pole piece.
[0006] Through the above structure, the powder is first stretched and thinned by each calendering roller to form a membrane, and then combined with the current collector in the second roller group to form a pole piece, wherein each calendering roller can not only realize the calendering of the membrane, but also realize the transfer of the membrane toward the second roller group, so that the membrane can be smoothly transferred to the second roller group and combined with the current collector to form a pole piece. In addition, since the roller diameters of each calendering roller are equal, the membrane is more evenly stressed when it is transferred between the calendering rollers, which is more conducive to the membrane sticking to the roller, reducing the probability of the membrane breaking, and improving the production efficiency of the rolling process.
[0007] In some embodiments, the second roller group includes at least two composite rollers, a accommodating gap for accommodating the current collector and the membrane is formed between two adjacent composite rollers, and the roller diameters of each composite roller are equal; wherein the roller diameter of each calendering roller is smaller than the roller diameter of each composite roller.
[0008] The above structure can improve the thinning force provided by each calendering roller to the membrane, thereby improving the thinning effect of the membrane, and enable the membrane after calendering and thinning to be smoothly combined with the current collector at the composite roller to form a pole piece.
[0009] In some embodiments, the rotation directions of every two adjacent calendering rollers are opposite, and each calendering roller is configured to transfer the incoming material in a direction toward the second roller set.
[0010] Thus, the membrane can be smoothly transferred between the calendering rollers and move in the direction toward the composite roller, so that the membrane can smoothly enter between the two composite rollers after calendering and thinning, and then composite with the current collector in the accommodating gap to form a pole piece.
[0011] In some embodiments, along the transfer direction of the film sheet, the rotation speeds of the calendering rollers and the composite rollers increase sequentially.
[0012] Through the above structure, the rolling and thinning effect on the membrane can be further improved, the probability of the membrane being broken can be reduced, and the membrane can be transferred more smoothly.
[0013] In some embodiments, along the transfer direction, the gap between every two adjacent calendering rolls and the gap between the calendering roll and the composite roll decreases sequentially.
[0014] Therefore, along the transfer direction of the membrane, the gaps between adjacent calendering rollers and composite rollers are reduced in sequence, so that the membrane can be better accommodated in the gaps, and the pressure is more evenly applied to the membrane, thereby improving the rolling effect on the membrane.
[0015] In some embodiments, the first roller group includes at least two groups, which are respectively located on opposite sides of the second roller group along a preset direction. Through the above structure, membranes can be respectively arranged on the surfaces of opposite sides of the current collector to form a multi-layer structured pole piece.
[0016] In some embodiments, the gap between the first and second calendering rollers away from the second roller group in a preset direction is a feeding gap, and the rolling mechanism also includes a feeding component, which is arranged corresponding to the feeding gap and is used to provide incoming material to the feeding gap.
[0017] By providing a feeding assembly, the powder to be rolled can be provided between the calendering rollers, so that the powder can be smoothly formed into a pole piece after calendering and compounding.
[0018] In some embodiments, the rolling mechanism further includes at least two driving members and at least two reducers, one end of each reducer is drivingly connected to the corresponding driving member, and the other end is connected to the corresponding calendering roller to drive the calendering rollers to rotate.
[0019] Through the above structure, the independent rotation of each calendering roller is realized. In addition, the reducer is directly connected between the driving member and the calendering roller, so that the structure is simpler.
[0020] In some embodiments, the rolling mechanism further includes an unwinding assembly, which is disposed corresponding to the second roller group and is used to provide a current collector to the second roller group.
[0021] Therefore, by providing the unwinding assembly, the membrane and the current collector can be rolled and compounded in the accommodating gap between adjacent compound rollers, and finally the pole piece is smoothly formed.
[0022] In some embodiments, the rolling mechanism further includes a winding assembly, which is disposed on the other side of the second roller group away from the unwinding assembly along a direction intersecting the preset direction and is used to wind up the pole piece.
[0023] Therefore, after the membrane and the current collector are rolled and compounded in the receiving gap to form a pole piece, the winding assembly can wind up the pole piece to facilitate the storage of the pole piece and the subsequent transfer and transportation.
[0024] In a second aspect, the present application also provides a pole piece processing device, comprising the rolling mechanism as described above, the rolling mechanism being used to composite the membrane and the current collector to form a pole piece.
[0025] In a third aspect, the present application also provides a battery production device, including the pole piece processing device as described above.
[0026] In the above-mentioned rolling mechanism, pole piece processing device and battery production equipment, the powder is first stretched and thinned by the calendering rollers in the first roller group to form a membrane, and then combined with the collector in the second roller group to form a pole piece, wherein each calendering roller can not only realize the calendering of the membrane, but also realize the transfer of the membrane toward the second roller group, so that the membrane can be smoothly transferred to the second roller group and combined with the collector to form a pole piece; in addition, since the roller diameters of each calendering roller are equal, the membrane is subjected to more uniform force when transferred between the calendering rollers, which is more conducive to the membrane sticking to the rollers, reduces the probability of membrane breakage, and improves the production efficiency of the rolling process. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the roller structure of the prior art.
[0028] Figure 2 Schematic diagram of the structure of a rolling mechanism according to one or more embodiments.
[0029] Figure 3 Schematic diagram of the structure of a rolling mechanism according to one or more embodiments.
[0030] Figure 4 It is a schematic structural diagram of a first roller group and a second roller group in a rolling mechanism according to one or more embodiments.
[0031] Explanation of the reference numerals: 100, rolling mechanism; 200, current collector; 10, first roller group; 20, second roller group; 30, feeding assembly; 40, unwinding assembly; 50, winding assembly; 11, calendering roller; 12, feeding gap; 21, composite roller; 22, accommodating gap; a, preset direction. DETAILED DESCRIPTION
[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application 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 application.
[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.
[0038] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.
[0039] In the production process of batteries, the pole piece processing technology can be divided into wet process and dry process according to whether solvents are used. Among them, the wet process uses liquid slurry, which contains a large amount of solvent. The dry process does not require the addition of any solvent. First, the materials are mixed and fibrillated. After the mixed and fibrillated materials are rolled several times, a powder film of a certain size is prepared, and the film is stretched and thinned, and then the film and the collector are hot-pressed to obtain a dry pole piece.
[0040] However, if Figure 1 As shown, in the current dry process, in the process of rolling the powder multiple times to form a membrane, multiple sets of roller structures need to be set up, so that the membrane is rolled and thinned between each roller structure and transferred, so as to facilitate the composite of the rolled membrane and the current collector. However, when the membrane is running in the roller structure, the strength requirement for the membrane is high, and the membrane is prone to breakage, resulting in low production efficiency in the rolling process.
[0041] Based on the above considerations, in order to solve the problem that in the current process of rolling the powder multiple times to form a membrane, the membrane is not easy to stick to the rollers and break when transferring between different rollers, thereby resulting in low production efficiency of the rolling process, one or more embodiments of the present application provide a roller press, in which the powder is first stretched and thinned by each calendering roller in the first roller group to form a membrane, and then combined with the current collector in the second roller group to form a pole piece. Among them, each calendering roller can not only realize the calendering of the membrane, but also realize the transfer of the membrane toward the second roller group, so that the membrane can be smoothly transferred to the second roller group and combined with the current collector to form a pole piece. In addition, since the roller diameters of each calendering roller are equal, the membrane is subjected to more uniform force when transferring between the calendering rollers, which is more conducive to the membrane sticking to the rollers, reducing the probability of the membrane breaking, and improving the production efficiency of the rolling process.
[0042] Please also read Figure 2 and Figure 3 An embodiment of the present application provides a rolling mechanism 100, comprising a first roller group 10 and a second roller group 20. The first roller group 10 comprises at least two calendering rollers 11 arranged at intervals along a preset direction a, and the axes of the calendering rollers 11 are parallel to each other and have the same roller diameter D1. The second roller group 20 is arranged at intervals downstream of the first roller group 10 along the preset direction a, and is arranged parallel to the axes of the calendering rollers 11.
[0043] Specifically, each calendering roller 11 is rotatably arranged around its own axis to calender the incoming material to form a membrane. Correspondingly, the second roller group 20 is also rotatably arranged around its own axis to combine the membrane calendered by the first roller group 10 with the current collector 200 to form a pole piece.
[0044] It should be noted that the rolling mechanism 100 provided in the present application can be applied to the preparation process of dry-process electrode sheets, and of course, can also be applied to other processes of forming membranes by rolling.
[0045] The preset direction a can be set to a horizontal direction, wherein, for the structure of the electrode processing device, conventional pressing rollers are arranged in sequence along the horizontal direction. Based on this, the present application arranges each calendering roller 11 at intervals along the horizontal direction, which can maintain the original structural arrangement of the electrode processing device as much as possible on the basis of realizing the calendering and transfer of the incoming material, thereby improving practicality.
[0046] The calendering roller 11 is a structure that can stretch and thin the powder provided by the upstream, so that the powder forms a film during the calendering process, and can be transferred following the rotation direction of each calendering roller 11. In other words, each calendering roller 11 is arranged at intervals along the preset direction a, and rotates around its own axis, which can not only realize the calendering of the powder, but also transfer the formed film.
[0047] The number of the calendering rollers 11 can be set to two or more, and can be adjusted accordingly according to the required number of calendering operations and the thickness requirements of the membrane, which will not be elaborated herein.
[0048] The second roller group 20 refers to a structure that can receive the membrane transferred by the calendering roller 11, and compound the membrane with the current collector 200 to form a pole piece. The second roller group 20 is arranged downstream of the first roller group 10 in the horizontal direction, that is, when the second roller group 20 is arranged on the right side of the first roller group 10 in the horizontal direction, the second roller group 20 is arranged with one of the rightmost calendering rollers 11 in the first roller group 10, and a gap is formed between the two for the membrane to pass through. When the second roller group 20 is arranged on the left side of the first roller group 10 in the horizontal direction, the second roller group 20 is arranged with one of the leftmost calendering rollers 11 in the first roller group 10, and a gap is formed between the two for the membrane to pass through.
[0049] Furthermore, the roller diameters of the calendering rollers 11 are equal. As a result, the film is subjected to more uniform force when being calendered and transferred between the calendering rollers 11, so that the film can be better adhered to the calendering rollers 11, and the film can be smoothly transferred along the rotation direction of the calendering rollers 11, reducing the probability of film breakage and improving the production efficiency of the rolling process.
[0050] Through the above structure, the powder is first stretched and thinned by each calendering roller 11 to form a membrane, and then combined with the current collector 200 in the second roller group 20 to form a pole piece. Among them, each calendering roller 11 can not only realize the calendering of the membrane, but also realize the transfer of the membrane toward the second roller group 20, so that the membrane can be smoothly transferred to the second roller group 20 and combined with the current collector 200 to form a pole piece. In addition, since the roller diameters of each calendering roller 11 are equal, the membrane is more evenly stressed when it is transferred between the calendering rollers 11, which is more conducive to the membrane sticking to the roller, reducing the probability of the membrane breaking, and improving the production efficiency of the rolling process.
[0051] In some embodiments, the second roller group 20 includes at least two composite rollers 21, and a receiving gap 22 for receiving the current collector 200 and the membrane is formed between two adjacent composite rollers 21, and the roller diameter D2 of each composite roller 21 is equal. Among them, the roller diameter D1 of each calendering roller 11 is smaller than the roller diameter D2 of each composite roller 21.
[0052] Specifically, the composite roller 21 refers to a structure capable of rolling and composite the membrane and the current collector 200 to form a pole piece. The second roller group 20 may include two composite rollers 21, which are arranged at intervals along a preset direction a and form a receiving gap 22 therebetween.
[0053] It can be understood that in some other embodiments, the second roller group 20 may also include multiple composite rollers 21, and the composite rollers 21 are grouped in pairs, so that the membrane and the current collector 200 can be rolled and composited multiple times between multiple groups of composite rollers 21, thereby improving the bonding strength between the membrane and the current collector 200.
[0054] The membrane is transferred to the composite roller 21 under the action of the calendering roller 11. At the same time, the current collector 200 is transported to the accommodation gap 22 between the two composite rollers 21, so that the current collector 200 in the accommodation gap 22 and the membrane are composited under the rolling action of the composite roller 21 to form a pole piece.
[0055] Furthermore, the roller diameters of the composite rollers 21 are equal, and the roller diameters of the calender rollers 11 are smaller than the roller diameters of the composite rollers 21. The film is first stretched and thinned between the calender rollers 11, so the roller diameters of the calender rollers 11 are set to be smaller than the roller diameter of the composite rollers 21, so that the thinning force provided by the calender rollers 11 to the film is increased, thereby improving the thinning effect of the calender rollers 11 on the film, so that the film can smoothly reach the thickness required for production.
[0056] After the membrane is thinned by the calendering roller 11, it is compounded with the current collector 200 between the compounding rollers 21. Therefore, the compounding roller 21 with a larger roller diameter can achieve rapid compounding between the membrane and the current collector 200, and smoothly form a pole piece.
[0057] The above structure can improve the thinning force provided by each calendering roller 11 to the membrane, thereby improving the thinning effect of the membrane, and enable the membrane after calendering and thinning to be smoothly combined with the current collector 200 at the composite roller 21 to form a pole piece.
[0058] In some embodiments, the rotation directions of every two adjacent calendering rollers 11 are opposite, and each calendering roller 11 is configured to be able to transfer the incoming material in a direction toward the second roller set 20 .
[0059] Specifically, when the number of calendering rollers 11 is set to multiple, if the rotation direction of the first calendering roller 11 away from the composite roller 21 is clockwise, the rotation direction of the second calendering roller 11 is counterclockwise, the rotation direction of the third calendering roller 11 is clockwise, the rotation direction of the fourth calendering roller 11 is counterclockwise, and so on.
[0060] Thus, the membrane can be smoothly transferred between the calendering rollers 11 and move in the direction toward the composite roller 21, so that the membrane can smoothly enter between the two composite rollers 21 after calendering and thinning, and then be composited with the current collector 200 in the accommodating gap 22 to form a pole piece.
[0061] In some embodiments, along the transfer direction of the film, the rotation speeds of the calendering rollers 11 and the composite rollers 21 increase sequentially.
[0062] Specifically, in the horizontal direction, in a group of calendering rollers 11 located on the left side of the composite roller 21, the rotation speed of each calendering roller 11 increases from left to right, and is less than the rotation speed of the adjacent composite roller 21. In the horizontal direction, in a group of calendering rollers 11 located on the right side of the composite roller 21, the rotation speed of each calendering roller 11 increases from right to left, and is less than the rotation speed of the adjacent composite roller 21.
[0063] The faster the roller rotates, the better the calendering and thinning effect on the film, which can make the film adhere to the roller better, reduce the probability of film breakage, and make the film transfer more smoothly.
[0064] Therefore, through the above structure, the rolling and thinning effect on the film can be further improved, the probability of film breakage can be reduced, and the film can be transferred more smoothly.
[0065] like Figure 4 As shown, in some embodiments, along the transfer direction, the gap R between every two adjacent calendering rollers 11 and the gap R between the calendering roller 11 and the composite roller 21 decreases successively.
[0066] Specifically, as the calendering roller 11 thins the film, the thickness of the film gradually decreases. Therefore, along the transfer direction of the film, the gaps between the adjacent calendering rollers 11 and the composite roller 21 are reduced in sequence, so that the film can be better accommodated in the gaps, and the pressure is more evenly applied to the film, thereby improving the rolling effect on the film.
[0067] like Figure 3 As shown, in some embodiments, the first roller set 10 includes at least two sets, and are respectively located on opposite sides of the second roller set 20 along a preset direction a.
[0068] Specifically, the first roller set 10 may include two sets, and the two sets of first roller sets 10 are respectively arranged on opposite sides of the second roller set 20 in the horizontal direction. Each set of first roller sets 10 can realize the calendering and transfer of a membrane sheet, and then in the second roller set 20, the two membrane sheets are respectively rolled onto the two opposite surfaces of the current collector 200, so that the current collector 200 is sandwiched between the two membrane sheets to form a pole sheet.
[0069] Of course, the first roller group 10 may also include three or more groups, which may provide a layer structure formed by multiple membranes or other powders, so that the pole piece finally formed can meet different production requirements, which will not be elaborated here.
[0070] It should be noted that the number of the first roller group 10 should be adjusted according to the structure of the final electrode sheet. When the surface of one side of the current collector is coated, the first roller group 10 can be set as one group and set on one side of the second roller group 20, such as Figure 2 When both sides of the current collector need to be coated, the first roller group 10 can be set into two or more groups, and respectively set on the opposite sides of the second roller group 20, as shown. Figure 3 shown.
[0071] Through the above structure, membranes can be respectively arranged on the surfaces of the two opposite sides of the current collector 200 to form a multi-layered electrode.
[0072] In some embodiments, the gap between the first and second calendering rollers 11 away from the second roller group 20 along the preset direction a is a feeding gap 12, and the rolling mechanism 100 also includes a feeding component 30, which is arranged corresponding to the feeding gap 12 and is used to provide incoming materials to the feeding gap 12.
[0073] Specifically, the feeding assembly 30 refers to a structure capable of providing powder to the feeding gap 12 so that the powder is rolled by the calendering roller 11 in the feeding gap 12 to form a membrane.
[0074] Along the transfer direction of the diaphragm, a feeding gap 12 is formed between the first calendering roller 11 and the second calendering roller 11, the feeding assembly 30 is set toward the feeding gap 12, and powder is provided to the feeding gap 12, so that the powder can smoothly enter the feeding gap 12, and form a diaphragm after being rolled by two adjacent calendering rollers 11 in the feeding gap 12.
[0075] By providing the feeding assembly 30 , the powder to be rolled can be provided between the calendering rollers 11 , so that the powder can be smoothly formed into an electrode sheet after calendering and compounding.
[0076] In some embodiments, the rolling mechanism 100 also includes at least two driving members (not shown in the figure) and at least two reducers (not shown in the figure), one end of each reducer is connected to the corresponding driving member, and the other end is connected to the corresponding calendering roller, so as to drive each calendering roller to rotate.
[0077] Specifically, the driving member can be set as a direct drive motor (DD motor), the DD motor is directly connected to the reducer drive, and then the reducer is directly connected to a corresponding calendering roller transmission. Under the driving action of the DD motor, the reducer can drive the calendering roller to rotate, thereby realizing the independent rotation of each calendering roller.
[0078] In addition, the speed reducer is directly connected between the driving member and the calendering roller without the need for a coupling, which not only makes the driving process more stable, but also makes the overall driving structure simpler, thereby further simplifying the overall structure of the rolling mechanism.
[0079] In some embodiments, the rolling mechanism 100 further includes an unwinding assembly 40 , which is disposed corresponding to the second roller set 20 and is used to provide the current collector 200 to the second roller set 20 .
[0080] Specifically, when two composite rollers 21 are provided, the unwinding assembly 40 is disposed corresponding to the receiving gap 22 between the two composite rollers 21 , and the current collector 200 is provided in the receiving gap 22 .
[0081] Therefore, by providing the unwinding assembly 40 , the membrane and the current collector 200 can be rolled and compounded in the receiving gap 22 between adjacent compound rollers 21 , and finally the pole piece is smoothly formed.
[0082] In some embodiments, the rolling mechanism 100 further includes a winding assembly 50, which is disposed on the other side of the second roller group 20 away from the unwinding assembly 40 along a direction intersecting with the preset direction a, and is used to wind up the pole piece.
[0083] Specifically, the winding assembly 50 and the unwinding assembly 40 are respectively disposed on opposite sides of the second roller group 20 in the vertical direction. For example, the unwinding assembly 40 is disposed above the second roller group 20 , and the winding assembly 50 is disposed below the second roller group 20 .
[0084] Therefore, after the membrane and the current collector 200 are rolled and compounded in the receiving gap 22 to form a pole piece, the winding assembly 50 can wind up the pole piece to facilitate the storage of the pole piece and the subsequent transfer and transportation.
[0085] Based on the same concept as the above-mentioned rolling mechanism 100, the present application also provides a pole piece processing device, including the above-mentioned rolling mechanism 100, and the rolling mechanism 100 is used to combine the membrane and the current collector 200 to form a pole piece.
[0086] Based on the same concept as the above-mentioned pole piece processing device, the present application also provides a battery production equipment, including the pole piece processing device as described above.
[0087] According to one or more embodiments, when the present application is used, the feeding assembly 30 is first used to provide the powder into the feeding gap 12, and then the powder is formed into a film under the rolling action of two adjacent calendering rollers 11. At the same time, the film is driven by the rotation of each calendering roller 11 to transfer in the direction toward the composite roller 21. And during the transfer process, the film is continuously calendered and thinned under the action of the calendering roller 11, so that the film reaches the target thickness.
[0088] Further, the membrane is transferred from the calendering roller 11 to the composite roller 21, and then enters the receiving gap 22 between two adjacent composite rollers 21. At the same time, the unwinding assembly 40 provides the current collector 200 to the receiving gap 22, so that the membrane and the current collector 200 are rolled and composited in the receiving gap 22, and finally the pole piece is smoothly formed.
[0089] Finally, the winding assembly 50 winds up the formed pole piece.
[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.
[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A rolling mechanism, characterized in that: include: The first roller group comprises at least two calendering rollers arranged at intervals along a preset direction, wherein the axes of the calendering rollers are parallel to each other and have the same roller diameters; and A second roller group is arranged downstream of the first roller group at intervals along the preset direction and is arranged parallel to the axes of the calendering rollers; Among them, each of the calendering rollers is rotatably arranged around its own axis, and is used to calender the incoming material to form a membrane; the second roller group is rotatably arranged around its own axis, and is used to combine the calendered membrane with the collector to form a pole piece.
2. The rolling mechanism according to claim 1, characterized in that: The second roller group includes at least two composite rollers, and a receiving gap for receiving the current collector and the membrane is formed between two adjacent composite rollers, and the roller diameters of the composite rollers are equal; Wherein, the roller diameter of each of the calendering rollers is smaller than the roller diameter of each of the composite rollers.
3. The rolling mechanism according to claim 2, characterized in that: The rotation directions of each two adjacent calendering rollers are opposite, and each calendering roller is configured to be able to transfer the incoming material in a direction toward the second roller group.
4. The rolling mechanism according to claim 3, characterized in that: Along the transfer direction of the film, the rotation speeds of the calendering rollers and the composite rollers increase successively.
5. The rolling mechanism according to claim 4, characterized in that: Along the transfer direction, the gap between each two adjacent calendering rollers and the gap between the calendering roller and the composite roller decreases in sequence.
6. The rolling mechanism according to claim 1, characterized in that: The first roller group includes at least two groups, and are respectively located on opposite sides of the second roller group along the preset direction.
7. The rolling mechanism according to claim 1, characterized in that: The gap between the first and second calendering rollers of the second roller group away from each other along the preset direction is a feeding gap. The rolling mechanism also includes a feeding component, which is arranged corresponding to the feeding gap and is used to provide incoming material to the feeding gap.
8. The rolling mechanism according to claim 1, characterized in that: The rolling mechanism also includes at least two driving members and at least two reducers. One end of each reducer is drivingly connected to the corresponding driving member, and the other end is connected to the corresponding calendering roller to drive the calendering roller to rotate.
9. The rolling mechanism according to any one of claims 1 to 8, characterized in that: The rolling mechanism further includes an unwinding assembly, which is disposed corresponding to the second roller group and is used to provide the current collector to the second roller group.
10. The rolling mechanism according to claim 9, characterized in that: The rolling mechanism further includes a winding assembly, which is arranged on the other side of the second roller group away from the unwinding assembly along a direction intersecting the preset direction and is used to wind up the pole piece.
11. A pole piece processing device, characterized in that: It comprises a rolling mechanism as described in any one of claims 1 to 10, wherein the rolling mechanism is used to combine the membrane and the current collector to form a pole piece.
12. A battery production device, characterized in that: It comprises a pole piece processing device as claimed in claim 11.