Rolling equipment and composite electrode preparation device
By setting multiple discharge ports and composite roll gaps in the feeding assembly of the rolling equipment, the problem of a large number of components in the electrode layer manufacturing device is solved, achieving space saving and improved preparation efficiency, and ensuring the consistency of electrode layer forming.
Patent Information
- Application Number
- CN202520556877.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Existing electrode layer manufacturing equipment has a large number of components, occupies a large space, has high production costs, and has low electrode layer preparation efficiency.
Design a rolling equipment that reduces the number of feeding components by setting multiple discharge ports on the feeding assembly and forming a double roll gap using first and second roll pressing devices. This allows for direct rolling of materials flowing out of multiple pre-roll gaps. Combined with an independent roll pressing device structure, the size and position can be flexibly changed to improve production efficiency.
It effectively reduces the number of components in the rolling equipment, lowers the space requirements for layout, improves the preparation efficiency and flexibility of the electrode layer, avoids material mixing during the composite process of the electrode layer, and enhances the forming consistency of the electrode layer.
Smart Images
Figure CN223888698U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, concretely relates to rolling equipment and composite electrode preparation device. BACKGROUND
[0002] Dry electrode technology is a key technology in the development of future high-performance energy storage devices due to its advantages of no solvent, low manufacturing cost, high electrode mechanical strength, and environmental friendliness. This technology directly coats electrode materials in powder form without using solvents, and uses techniques such as hot pressing, extrusion, fiberization, powder spraying, and 3D printing to produce thicker electrodes that are more cost-effective. It has outstanding performance in environmental protection, reducing production costs, and improving battery energy density.
[0003] Currently, electrodes composed of multiple electrode layers manufactured through dry electrode technology are a popular development direction. In the electrode manufacturing process, due to the large number of electrode layers, the production line needs to be equipped with the same number of feeding equipment under this production mode, which not only occupies a large space in the production workshop, but also makes the production cost higher. SUMMARY
[0004] Therefore, the utility model provides a kind of rolling equipment and composite electrode preparation device to solve the problem of the large number of components of the existing electrode layer manufacturing device.
[0005] In the first aspect, the utility model provides a kind of rolling equipment, comprising: feeding assembly, feeding assembly is equipped with at least first discharge port and second discharge port;The path of the material flowing out of the first discharge port is provided with first pre-roller and first roller pressing device;The path of the material flowing out of the second discharge port is provided with second pre-roller and second roller pressing device;The first roller pressing device is oppositely arranged with the first pre-roller, and a first pre-roller pressing gap is formed for the material flowing out of the first discharge port to enter;The second roller pressing device is oppositely arranged with the second pre-roller, and a second pre-roller pressing gap is formed for the material flowing out of the second discharge port to enter;The first roller pressing device is oppositely arranged with the second roller pressing device, and a complex roller pressing gap is formed for the material flowing out of the first pre-roller pressing gap and the second pre-roller pressing gap to enter.
[0006] Beneficial effects: multiple discharge ports are arranged on the feeding assembly, and the discharge ports of the feeding assembly are correspondingly arranged with the corresponding pre-roller pressing gaps. Different materials can be sent into the corresponding pre-roller pressing gaps through one feeding assembly, without the need for arranging multiple feeding assemblies side by side. This can effectively reduce the number of feeding assemblies, significantly reduce the layout space required for the rolling equipment, effectively solve the problem of the large number of components of the existing electrode layer manufacturing device, and directly roll the materials flowing out of multiple pre-roller pressing gaps through the complex roller pressing gap formed by the first roller pressing device and the second roller pressing device. The structure is simple and reliable, and the preparation efficiency of the electrode layer can be improved.
[0007] In an alternative embodiment, the first roller pressing device is a first double roller, the radius of the first double roller is greater than the radius of the first pre-roller, the first double roller has a first primary roller pressing portion on the side close to the first discharge port, the first primary roller pressing portion is arranged opposite to the first pre-roller, and a first pre-roller pressing gap is formed for the material flowing out of the first discharge port to enter, the side of the first primary roller pressing portion and the first pre-roller for receiving the material into the first pre-roller pressing gap is a first material inlet side, and the other side for outputting the material from the first pre-roller pressing gap is a first material outlet side; the second roller pressing device is a second double roller, the radius of the second double roller is greater than the radius of the second pre-roller, the second double roller has a second primary roller pressing portion on the side close to the second discharge port, the second primary roller pressing portion is arranged opposite to the second pre-roller, and a second pre-roller pressing gap is formed for the material flowing out of the second discharge port to enter, the side of the second primary roller pressing portion and the second pre-roller for receiving the material into the second pre-roller pressing gap is a second material inlet side, and the other side for outputting the material from the second pre-roller pressing gap is a second material outlet side; the first double roller has a first double roller pressing portion on the side close to the first material outlet side, the second double roller has a second double roller pressing portion on the side close to the second material outlet side, the first double roller pressing portion and the second double roller pressing portion are arranged opposite to each other, and a double roller pressing gap is formed for the material flowing out of the first pre-roller pressing gap and the second pre-roller pressing gap to enter.
[0008] Beneficial effects: the first double roller and the second double roller can directly cooperate to form the double roller pressing gap, and no additional roller needs to be separately arranged, so that the number of parts of the rolling equipment can be effectively reduced.
[0009] In an alternative embodiment, the first roller pressing device includes a first double roller and a first primary roller, the first primary roller is arranged opposite to the first pre-roller, and a first pre-roller pressing gap is formed for the material flowing out of the first discharge port to enter, the side of the first primary roller and the first pre-roller for receiving the material into the first pre-roller pressing gap is a first material inlet side, and the other side for outputting the material from the first pre-roller pressing gap is a first material outlet side;
[0010] The second roller pressing device includes a second double roller and a second primary roller, the second primary roller is arranged opposite to the second pre-roller, and a second pre-roller pressing gap is formed for the material flowing out of the second discharge port to enter, the side of the second primary roller and the second pre-roller for receiving the material into the second pre-roller pressing gap is a second material inlet side, and the other side for outputting the material from the second pre-roller pressing gap is a second material outlet side;
[0011] The first double roller is located at the first material outlet side, the second double roller is located at the second material outlet side, the first double roller and the second double roller are arranged opposite to each other, and a double roller pressing gap is formed for the material flowing out of the first pre-roller pressing gap and the second pre-roller pressing gap to enter.
[0012] Beneficial effects: the first roller pressing device and the second roller pressing device are independently structured, can be flexibly changed in size and position according to the roller pressing requirement, are simple and reliable in structure, and can further improve the flexibility of the electrode layer preparation process.
[0013] In an alternative embodiment, at least one third discharge port is further arranged between the first discharge port and the second discharge port, the third discharge port is provided with oppositely arranged third pre-rollers and fourth pre-rollers on the material flow path, and the third pre-rollers and the fourth pre-rollers are located on one side of the complex roller pressing gap for the material flowing out from the first pre-roller pressing gap and the second pre-roller pressing gap.
[0014] Beneficial effects: the rolling equipment of this form has a large number of discharge ports, can discharge through more than three discharge ports at the same time, and can further improve the efficiency of the rolling equipment in forming the electrode layer.
[0015] In an alternative embodiment, the feeding assembly comprises a housing and a partition, the housing forms a containing cavity inside, at least part of the structure of the partition is accommodated in the containing cavity, the partition separates the containing cavity into a plurality of sequentially arranged sub-material cavities, and the housing is provided with a corresponding discharge port corresponding to each sub-material cavity; and / or the housing of the feeding assembly is provided with a flow resistance plate between adjacent discharge ports.
[0016] Beneficial effects: the feeding assembly is simple and reliable in structure, this form of feeding assembly can avoid the mixing of materials in different sub-material cavities, compared with the forming method that the materials in a plurality of sub-material cavities enter a roller assembly at the same time and directly form a composite electrode layer, the rolling equipment of the embodiment can form different types of electrode layers separately, and then press them into a composite electrode layer, which can reduce the mixing of materials at the joint position of different electrode layers in the composite electrode layer.
[0017] In an alternative embodiment, at least another part of the structure of the partition penetrates the side of the housing where the discharge port is formed, to form a blocking structure between adjacent discharge ports.
[0018] Beneficial effects: this form of partition can not only play a separating role in the containing cavity, but also can reduce the mixing of materials output at adjacent discharge ports.
[0019] In an alternative embodiment, the housing of the feeding assembly is provided with an avoiding port between adjacent discharge ports ， The partition comprises a partition section and a blocking section, the partition section is located in the containing cavity, the blocking section penetrates the housing along the avoiding port, and the blocking section is used to form a blocking structure between adjacent discharge ports.
[0020] Beneficial effects: the penetration form of the partition is simple and reliable, and is convenient for processing and manufacturing.
[0021] In an alternative embodiment, a baffle plate is arranged between adjacent discharge ports, the baffle plate is arranged at one end of the blocking section away from the partition section, the baffle plate is located on the discharge path of the discharge port adjacent thereto and cooperates with the roll gap of one of the first roller assemblies adjacent thereto; the baffle plate has a guide surface for blocking the material, the guide surface is inclined along the direction from the partition section to the roll pressing inlet end of the first roller assembly adjacent thereto; and the inner wall of the accommodating cavity close to the discharge port is inclined.
[0022] Beneficial effects: the baffle plate can further improve the separation reliability between adjacent discharge ports, and can ensure that the material output at the discharge port falls stably into the corresponding pre-rolling gap; in addition, the inclined arrangement of the inner wall of the accommodating cavity can avoid the stacking of material at the discharge port.
[0023] In a second aspect, the utility model also provides a kind of composite electrode preparation device, it includes: at least one as above described rolling equipment, for rolling electrode layer;Third roller assembly, for the composite of electrode layer and current collector.
[0024] In an alternative embodiment, the rolling equipment includes two, the second roller assembly of the two rolling equipment is located at the opposite sides of the third roller assembly;It further includes unwinding assembly and winding assembly, and the current collector is rotated by unwinding assembly and winding assembly to continuously pass through the third roller assembly. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0026] Figure 1 It is a structure schematic view of the rolling equipment with two sub-material cavities of the utility model embodiment;
[0027] Figure 2 It is a structure schematic view of the rolling equipment with two sub-material cavities of the utility model embodiment; Figure 1
[0028] Figure 3 It is a structure schematic view of the rolling equipment with two sub-material cavities of the utility model embodiment; Figure 2
[0029] Figure 4 It is a structure schematic view of the rolling equipment with two sub-material cavities of the utility model embodiment;
[0030] Figure 5 It is a structure schematic view of the rolling equipment with two sub-material cavities of the utility model embodiment; Figure 4 A distribution diagram of sub-material cavities of a feeding assembly of the rolling device shown;
[0031] Figure 6 For Figure 4 A structural diagram of the rolling device shown with another form of flow blocking plate;
[0032] Figure 7 For Figure 4 A structural diagram of the shell of the rolling device shown;
[0033] Figure 8 For Figure 1 A structural diagram of the rolling device shown with another form of roller pressing unit.
[0034] Figure 9 A layout diagram of a composite electrode preparation device according to an embodiment of the present application.
[0035] Explanation of reference signs:
[0036] 1, feeding assembly;
[0037] 101, sub-material cavity; 1011, first matching cavity; 1012, second matching cavity;
[0038] 102, feeding end; 1021, feeding port;
[0039] 103, discharging end; 1031, discharging port; 1032, first discharging port; 1033, second discharging port; 1034, third discharging port;
[0040] 104, shell; 1041, containing cavity; 1042, avoiding port;
[0041] 105, partition piece; 1051, partition segment; 1052, blocking segment;
[0042] 106, flow blocking plate; 1061, guide surface;
[0043] 2, roller pressing unit;
[0044] 201, first pre-roller; 202, first roller pressing device; 2021, first re-pressing roller; 20211, first primary roller pressing part; 20212, first re-roller pressing part; 2022, first primary pressing roller; 203, first pre-roller pressing gap; 2031, first feeding side; 2032, first discharging side;
[0045] 204, second pre-roller; 205, second roller pressing device; 2051, second re-pressing roller; 20511, second primary roller pressing part; 20512, second re-roller pressing part; 2052, second primary pressing roller; 206, second pre-roller pressing gap; 2061, second feeding side; 2062, second discharging side;
[0046] 207. Roller gap;
[0047] 208. Third pre-roll; 209. Fourth pre-roll;
[0048] 5. Material; 6. Electrode layer; 7. Current collector; 8. Unwinding assembly; 9. Rewinding assembly;
[0049] X, the first direction; Y, the second direction. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0051] The following is combined with Figures 1 to 9 The following describes embodiments of the present invention.
[0052] According to an embodiment of the present invention, a rolling mill is provided, comprising: a feeding assembly 1, the feeding assembly 1 having at least a first discharge port 1032 and a second discharge port 1033; a first pre-roller 201 and a first rolling device 202 are provided on the path through which material 5 flows out of the first discharge port 1032; a second pre-roller 204 and a second rolling device 205 are provided on the path through which material 5 flows out of the second discharge port 1033; the first rolling device 202 is disposed opposite to the first pre-roller 201 to form a first pre-roll gap 203 for material 5 flowing out of the first discharge port 1032 to enter; the second rolling device 205 is disposed opposite to the second pre-roller 204 to form a second pre-roll gap 206 for material 5 flowing out of the second discharge port 1033 to enter; the first rolling device 202 and the second rolling device 205 are disposed opposite to each other to form a double rolling gap 207 for material 5 flowing out of the first pre-roll gap 203 and the second pre-roll gap 206 to enter.
[0053] Among them, the first discharge port 1032 and the second discharge port 1033 are both discharge ports 1031 on the feeding assembly 1.
[0054] The rolling equipment of this embodiment has multiple discharge ports 1031 on the feeding assembly 1. The discharge ports 1031 of the feeding assembly 1 are correspondingly set with the pre-roll gaps. Different materials 5 can be fed into the corresponding pre-roll gaps through one feeding assembly 1, without the need to set multiple feeding assemblies 1 side by side. This can effectively reduce the number of feeding assemblies 1 and significantly reduce the layout space required for the rolling equipment. It effectively solves the problem of the large number of components in the existing electrode layer 6 manufacturing device. In addition, the rolling equipment of this embodiment forms a compound roll gap 207 through two roll pressing devices, which can directly roll the materials 5 flowing out of multiple pre-roll gaps. The structure is simple and reliable, which can improve the preparation efficiency of the electrode layer 6.
[0055] Specifically, the rolling equipment has an intersecting first direction X and a second direction Y; it should be noted that the first direction X refers to Figure 1 The middle arrow points to the direction of "X", and the second direction, Y, refers to... Figure 1 The direction of the "Y" indicated by the middle arrow.
[0056] In addition, the rolling equipment includes a feeding assembly 1 and a rolling unit 2. The rolling unit 2 includes a first pre-roll 201, a first rolling device 202, a second pre-roll 204, and a second rolling device 205.
[0057] Furthermore, there is no restriction on the type of material 5 in the feeding component 1. It can be the same material 5 or multiple different materials 5, which can be selected according to the needs. The material chamber can be a single whole or divided into multiple parts. Each discharge port 1031 corresponds to a pre-rolling gap. Since multiple first roll pre-rolling gaps can output electrode layers 6 at the same time, the formation time of a single electrode layer 6 tends to be consistent, which can improve the consistency of the differential stretching degree and fiberization degree of different electrode layers 6.
[0058] In one possible implementation, such as Figure 1 and Figure 4 As shown, the first roller pressing device 202 is a first secondary pressing roller 2021. The radius of the first secondary pressing roller 2021 is larger than the radius of the first pre-roller 201. The first secondary pressing roller 2021 has a first primary pressing section 20211 on the side near the first discharge port 1031. The first primary pressing section 20211 and the first pre-roller 201 are arranged opposite to each other to form a first pre-pressing gap 203 for the material 5 flowing out from the first discharge port 1032 to enter. The side of the first primary pressing section 20211 and the first pre-roller 201 used to receive the material 5 entering the first pre-pressing gap 203 is the first feed side 2031, and the other side used to output the material 5 from the first pre-pressing gap 203 is the first discharge side 2032.
[0059] The second roller pressing device 205 is a second secondary pressing roller 2051. The radius of the second secondary pressing roller 2051 is larger than the radius of the second pre-roller 204. The second secondary pressing roller 2051 is a second primary pressing section 20511 on the side near the second discharge port 1031. The second primary pressing section 20511 is arranged opposite to the second pre-roller 204 to form a second pre-pressing gap 206 for material 5 flowing out from the second discharge port 1033 to enter. The side of the second primary pressing section 20511 and the second pre-roller 204 used to receive material 5 entering the second pre-pressing gap 206 is the second feed side 2061, and the other side used to output material 5 from the second pre-pressing gap 206 is the second discharge side 2062.
[0060] The first re-pressing roller 2021 is a first re-pressing section 20212 on the side near the first discharge side 2032, and the second re-pressing roller 2051 is a second re-pressing section 20512 on the side near the second discharge side 2062. The first re-pressing section 20212 and the second re-pressing section 20512 are arranged opposite to each other, forming a re-pressing gap 207 for the material 5 flowing out from the first pre-pressing gap 203 and the second pre-pressing gap 206 to enter.
[0061] This makes the structure simple and reliable. The first and second pressure rollers 2021 can be directly matched to form the pressure gap 207 between the rollers, eliminating the need for additional pressure rollers and effectively reducing the number of parts in the rolling equipment.
[0062] The dimensions of the first secondary pressure roller 2021, the first pre-roller 201, the second secondary pressure roller 2051, and the second pre-roller 204 are not specifically limited. The first secondary pressure roller 2021 and the second secondary pressure roller 2051 can be the same size or different sizes, and the first pre-roller 201 and the second pre-roller 204 can be the same size or different sizes, which can be flexibly selected according to the requirements.
[0063] For example, in one embodiment, the first pre-roller 201 and the second pre-roller 204 are the same size, and the first re-pressing roller 2021 and the second re-pressing roller 2051 are the same size. This type of roller shaft can make the rolling speed and efficiency more consistent, which is conducive to improving the consistency of the formed electrode layer 6.
[0064] In one possible implementation, such as Figure 8As shown, the first roller pressing device 202 includes a first secondary pressing roller 2021 and a first primary pressing roller 2022. The first primary pressing roller 2022 is arranged opposite to the first pre-roller 201 to form a first pre-roll pressing gap 203 for material 5 flowing out from the first discharge port 1032 to enter. The side of the first primary pressing roller 2022 and the first pre-roller 201 used to receive material 5 entering the first pre-roll pressing gap 203 is the first feed side 2031, and the other side used to output material 5 from the first pre-roll pressing gap 203 is the first discharge side 2032.
[0065] The second roller pressing device 205 includes a second secondary pressing roller 2051 and a second primary pressing roller 2052. The second primary pressing roller 2052 is arranged opposite to the second pre-pressing roller 204 to form a second pre-pressing gap 206 for material 5 flowing out from the second discharge port 1033 to enter. The side of the second primary pressing roller 2052 and the second pre-pressing roller 204 used to receive material 5 entering the second pre-pressing gap 206 is the second feed side 2061, and the other side used to output material 5 from the second pre-pressing gap 206 is the second discharge side 2062.
[0066] The first re-pressing roller 2021 is located on the first discharge side 2032, and the second re-pressing roller 2051 is located on the second discharge side 2062. The first re-pressing roller 2021 and the second re-pressing roller 2051 are arranged opposite to each other to form a re-pressing gap 207 for material 5 flowing out from the first pre-pressing gap 203 and the second pre-pressing gap 206 to enter.
[0067] The first rolling device 202 and the second rolling device 205 are structurally independent and can flexibly change their size and position according to the rolling requirements. They are simple and reliable in structure and can also improve the flexibility of the electrode layer 6 preparation process.
[0068] In one possible implementation, such as Figure 4 and Figure 5 As shown, at least one third discharge port 1034 is provided between the first discharge port 1032 and the second discharge port 1033. A third pre-roller 208 and a fourth pre-roller 209 are arranged opposite each other along the material flow path from the third discharge port 1034. The third pre-roller 208 and the fourth pre-roller 209 are located on the side of the roll gap 207 used to allow material 5 flowing from the first pre-roll gap 203 and the second pre-roll gap 206 to enter. This type of rolling mill has a large number of discharge ports 1031, allowing material to be discharged simultaneously through more than three discharge ports 1031, which can further improve the efficiency of the rolling mill in forming the electrode layer 6.
[0069] Understandable, such as Figure 1 , Figure 2 and Figure 3As shown, as an alternative implementation, the third discharge port 1034 may not be provided, and only the first discharge port 1032 and the second discharge port 1033 may be provided.
[0070] The number of third discharge ports 1034 can be selected according to the needs; there can be one or multiple third discharge ports 1034 set at intervals.
[0071] In one possible implementation, such as Figure 6 , Figure 7 As shown, the feeding assembly 1 includes a housing 104 and a partition 105. A receiving cavity 1041 is formed within the housing 104, and at least a portion of the partition 105 is accommodated within the receiving cavity 1041, as shown below. Figure 1 As shown, the separator 105 divides the receiving cavity 1041 into multiple sequentially arranged sub-material cavities 101. The housing 104 has a corresponding discharge port 1031 for each sub-material cavity 101. The feeding assembly 1 has a simple and reliable structure. This type of feeding assembly 1 can avoid the mixing of materials 5 in different sub-material cavities 101. Compared with the forming method where materials 5 in multiple sub-material cavities 101 enter a rolling assembly at the same time and directly form the composite electrode layer 6, the rolling equipment in this embodiment can form different types of electrode layers 6 separately and then press them into a composite electrode layer 6, which can reduce the mixing of materials at the junction of different electrode layers 6 in the composite electrode layer 6.
[0072] Specifically, such as Figure 1 As shown, multiple sub-material cavities 101 are arranged along the first direction X. One end of the feeding assembly 1 along the second direction Y is the feeding end 102, and the other end is the discharging end 103. The feeding end 102 is provided with a feeding port 1021 for each sub-material cavity 101, and the discharging end 103 is provided with a discharging port 1031 for each sub-material cavity 101. Each sub-material cavity 101 is connected to the corresponding feeding port 1021 and discharging port 1031 respectively.
[0073] Furthermore, such as Figure 4 As shown, one of the multiple material cavities 101 located at one edge along the first direction X forms a first mating cavity 1011, and one of the multiple material cavities 101 located at the other edge along the first direction X forms a second mating cavity 1012. The first re-pressing roller 2021 and the first pre-roller 201 are arranged corresponding to the first mating cavity 1011, and the second re-pressing roller 2051 and the second pre-roller 204 are arranged corresponding to the second mating cavity 1012.
[0074] Among them, such as Figure 4 As shown, both the first pressure roller 2021 and the second pressure roller 2051 are rollers that are close to the outside in the first direction X.
[0075] In one possible implementation, such as Figure 3 As shown, a baffle plate 106 is provided on the housing 104 of the feeding assembly 1 between adjacent discharge ports 1031.
[0076] In one possible implementation, such as Figure 3 and Figure 4 As shown, at least another part of the structure of the separator 105 passes through the side of the housing 104 where the discharge port 1031 is formed, and is used to form a blocking structure between adjacent discharge ports 1031. This type of separator 105 can not only play a separating role in the receiving cavity 1041, but also reduce the mixing of materials 5 output from adjacent discharge ports 1031.
[0077] Specifically, the specific structural form of the separator 105 is not limited. It can be a plate-like structure or a block-like structure with an internal cavity. It can be a flat plate or a bent plate with a curved surface or bends.
[0078] In one possible implementation, such as Figure 7 As shown, the housing 104 of the feeding assembly 1 has a clearance opening 1042 between adjacent discharge ports 1031, such as... Figure 3 As shown, the separator 105 includes a separator section 1051 and a blocking section 1052. The separator section 1051 is located in the receiving cavity 1041, and the blocking section 1052 passes through the housing 104 along the clearance opening 1042. The blocking section 1052 is used to form a blocking structure between adjacent discharge ports 1031. The insertion form of the separator 105 is simple and reliable, and easy to process and manufacture.
[0079] Specifically, the housing 104 and the partition 105 are detachably connected, so the size of the sub-material cavity 101 can be flexibly adjusted. In addition, since the housing 104 and the partition 105 are detachably connected, the distance that the partition 105 extends from the clearance port 1042 can also be adjusted. This type of feeding assembly 1 allows the length of the blocking section 1052 to be flexibly set according to the distance between the discharge port 1031 and the pre-rolling gap, thereby improving the reliability of blocking.
[0080] It should be noted that, in order to prevent material 5 from leaking through the clearance opening 1042, the outer wall of the blocking section 1052 is sealed to the inner wall of the clearance opening 1042.
[0081] It is understandable that a gap can be left between the outer wall of the blocking section 1052 and the inner wall of the clearance opening 1042, as long as the width of the gap is less than the particle size of the material 5. This type of clearance opening 1042 can also prevent the material 5 from leaking.
[0082] In one possible implementation, such as Figure 3As shown, a baffle plate 106 is provided between adjacent discharge ports 1031. The baffle plate 106 is located at one end of the blocking section 1052 away from the separating section 1051, as shown. Figure 6 As shown, the baffle plate 106 is located on the discharge path of the adjacent discharge port 1031 and cooperates with one of the roller gaps of the adjacent pre-rollers. The baffle plate 106 has a guide surface 1061 for blocking the material 5. The guide surface 1061 is inclined along the direction from the dividing section 1051 to the roller pressing inlet end of the adjacent pre-roller. The receiving cavity 1041 is inclined near the inner wall of the discharge port 1031. The baffle plate 106 can further improve the separation reliability between adjacent discharge ports 1031 and ensure that the material 5 output from the discharge port 1031 falls stably into the corresponding pre-roll pressing gap. In addition, the inclined inner wall of the receiving cavity 1041 can avoid the accumulation of material at the discharge port 1031.
[0083] Specifically, the shape of the guide surface 1061 is not limited; it can be a plane, a curved surface, etc., and can be selected according to the falling situation of the material 5.
[0084] For example, in one implementation, such as Figure 6 As shown, the guide surface 1061 is an arc-shaped surface. This type of guide surface 1061 can reduce the rebound of the material 5 after it comes into contact with the guide surface 1061.
[0085] According to an embodiment of the present invention, in another aspect, a composite electrode preparation apparatus is provided, comprising: at least one rolling device as described above and a third roll assembly 4, wherein the rolling device is used to roll an electrode layer 6 and the third roll assembly 4 is used to composite the electrode layer 6 with a current collector 7.
[0086] In one possible implementation, the rolling mill includes two, with the second roll assemblies 3 of the two rolling mills located on opposite sides of the third roll assembly 4.
[0087] It should be noted that, for example Figure 8 As shown, the dashed parts represent omitted parts. In one embodiment, the number of rolls on both sides of the third roll assembly 4 is the same. The composite electrode layer produced by the rolling equipment on both sides of the third roll assembly 4 enters the third roll assembly 4 after passing through the same number of rolls.
[0088] The composite electrode preparation apparatus also includes an unwinding assembly 8 and a winding assembly 9, through which the current collector 7 rotates to continuously pass through the third roll assembly 4.
[0089] The following describes the specific types of composite electrode layers 6 formed by the rolling equipment through Examples 2 to 15.
[0090] Examples 2 to 6 are case studies on the selection and design of main materials for different electrode layers 6 of dry composite electrodes.
[0091] In Example 2, the first and third electrode layers are composed of polycrystalline ternary materials, SP, CNT, and PTFE, with a mass percentage of 96%:1%:1%:2% for each component; the second and fourth electrode layers are composed of monocrystalline ternary materials, SP, CNT, and PTFE, with a mass percentage of 96%:1%:1%:2% for each component. A dry-process positive electrode composite electrode is prepared using the above-mentioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0092] In Example 3, the first and third electrode layers are composed of large-particle-size single-crystal ternary electrodes with a diameter of 50-6 μm, SP, and PTFE, with a mass percentage of 96%:1%:3%. The second and fourth electrode layers are composed of small-particle-size single-crystal ternary electrodes with a diameter of 50-3 μm, SP, CNT, and PTFE, with a mass percentage of 97%:1%:2%. A dry-process positive electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0093] In Example 4, the first and third electrode layers are composed of lithium manganese iron phosphate, SP, and PTFE, with a mass percentage of 95%:2%:3% for each component; the second and fourth electrode layers are composed of lithium manganese iron phosphate, single-crystal ternary lithium, SP, and PTFE, with a mass percentage of 55%:40%:2%:3% for each component. A dry-process positive electrode composite electrode is prepared using the above-mentioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0094] In Example 5, the first and third electrode layers are composed of natural graphite, SP, and PTFE, with a mass percentage of 97%:1%:2% for each component; the second and fourth electrode layers are composed of artificial graphite, SP, and PTFE, with a mass percentage of 97%:1%:2% for each component. A dry-process negative electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0095] In Example 6, the first and third electrode layers are composed of small-particle-size artificial graphite (Dv50-11μm), SP, and PTFE, with a mass percentage of 97%:1%:2%. The second and fourth electrode layers are composed of large-particle-size artificial graphite (Dv50-15μm), SP, and PTFE, with a mass percentage of 97%:1%:2%. A dry-process negative electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0096] Examples 7 to 10 illustrate the selection and design of binders for different electrode layers in dry-process composite electrodes. Given that polytetrafluoroethylene (PTFE) of different molecular weights exhibits varying degrees of fibrosis in the same dry-process electrode process, the resulting electrode films also exhibit different electrode properties. Furthermore, binders with non-fibrosis mechanisms can be introduced to assist in bonding.
[0097] In Example 7, the first and third electrode layers are composed of lithium iron phosphate (Dv50-1.5μm), SP, and PTFE, with a mass percentage of 96%:1%:3%, using ultra-high molecular weight PTFE with a molecular weight of over 10 million; the second and fourth electrode layers are also composed of lithium iron phosphate (Dv50-1.5μm), SP, and PTFE, with a mass percentage of 96%:1%:3%, using medium-high molecular weight PTFE with a molecular weight of 6 million to 10 million. A dry-process positive electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0098] In Example 8, the first and third electrode layers are composed of artificial graphite, SP, and PTFE, with a mass percentage of 97%:1%:2%, using high molecular weight PTFE with a molecular weight of 8-10 million; the second and fourth electrode layers are also composed of artificial graphite, SP, and PTFE, with a mass percentage of 97%:1%:2%, using medium molecular weight PTFE with a molecular weight of 3-6 million. A dry-process negative electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0099] In Example 9, the first and third electrode layers are composed of single-crystal ternary materials, SP, and PTFE, with a mass percentage of 97%:1%:2% for each component; the second and fourth electrode layers are composed of single-crystal ternary materials, SP, PTFE, and PVDF, with a mass percentage of 96%:1.5%:1.5%:1% for each component. A dry-process positive electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0100] In Example 10, the first and third electrode layers are composed of artificial graphite, SP, PTFE, and PVDF, with a mass percentage of 96.5%:1%:1.5%:1% for each component; the second and fourth electrode layers are also composed of artificial graphite, SP, PTFE, and PVDF, with a mass percentage of 97%:1%:1.2%:0.8% for each component. A dry-process negative electrode composite electrode is prepared using the aforementioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0101] Examples 11 to 13 are design cases for selecting conductive agents for different electrode layers in dry composite electrodes. Different conductive agents have different conductivity mechanisms. For example, conductive carbon black conducts electrons through point-to-point contact with the active material, carbon nanotubes and carbon fibers conduct electrons through point-to-line contact with the active material, and graphene conducts electrons through point-to-surface contact with the active material. Therefore, selecting conductive agents with different conductivity mechanisms, or using two or more conductive agents in combination, helps to build a good electronic conduction network inside the electrode.
[0102] In Example 11, the first and third electrode layers are composed of single-crystal ternary materials, VGCF, and PTFE, with a mass percentage of 96.5%, 1.5%, and 2% for each component; the second and fourth electrode layers are also composed of single-crystal ternary materials, VGCF, and PTFE, with a mass percentage of 97%, 1%, and 2% for each component. A dry-process positive electrode composite electrode is prepared using the aforementioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0103] In Example 12, the first and third electrode layers are composed of single-crystal ternary materials, VGCF, SP, and PTFE, with a mass percentage of 96%:1%:1%:2% for each component; the second and fourth electrode layers are also composed of single-crystal ternary materials, VGCF, and PTFE, with a mass percentage of 96.5%:1.5%:2% for each component. A dry-process positive electrode composite electrode is prepared using the above-mentioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0104] In Example 13, the first and third electrode layers are composed of artificial graphite, graphene, and PTFE, with a mass percentage of 97.4%, 0.8%, and 1.8% for each component; the second and fourth electrode layers are composed of artificial graphite, SP, and PTFE, with a mass percentage of 97%, 1%, and 2% for each component. A dry-process negative electrode composite electrode is prepared using the above-mentioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0105] Examples 14 and 15 are formulation design cases for different electrode layers 6 of dry-process composite electrodes. In order to meet the requirements of lithium battery manufacturing with special or superior electrical performance, the formulations of different electrode layers 6 of dry-process composite electrodes need to be specifically designed to meet electrode kinetic requirements.
[0106] In Example 14, the first and third electrode layers are composed of single-crystal ternary materials, SP, and PTFE, with a mass percentage of 96.7%, 1.5%, and 1.8% for each component; the second and fourth electrode layers are also composed of single-crystal ternary materials, SP, and PTFE, with a mass percentage of 97%, 1%, and 2% for each component. A dry-process positive electrode composite electrode is prepared using the above-described feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0107] In Example 15, the first and third electrode layers are composed of artificial graphite, SP, and PTFE, with a mass percentage of 97%:1.2%:1.8% for each component; the second and fourth electrode layers are also composed of artificial graphite, SP, and PTFE, with a mass percentage of 98%:0.8%:1.2% for each component. A dry-process negative electrode composite electrode is prepared using the aforementioned feeding assembly 1 with two sub-filling chambers 101 and the composite electrode preparation device.
[0108] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A rolling mill, characterized in that, include: The feeding assembly (1) is provided with at least a first discharge port (1032) and a second discharge port (1033); The first pre-roller (201) and the first roller pressing device (202) are provided on the path of the material (5) flowing out of the first discharge port (1032); The second discharge port (1033) is provided with a second pre-roller (204) and a second roller pressing device (205) on the path of the material (5) flowing out; The first roller pressing device (202) is arranged opposite to the first pre-roller (201) to form a first pre-roller pressing gap (203) for the material (5) flowing out from the first discharge port (1032) to enter; The second roller pressing device (205) is arranged opposite to the second pre-roller (204) to form a second pre-roller pressing gap (206) for the material (5) flowing out from the second discharge port (1033) to enter; The first roller pressing device (202) and the second roller pressing device (205) are arranged opposite to each other, forming a secondary roller pressing gap (207) for the material (5) flowing out from the first pre-roll pressing gap (203) and the second pre-roll pressing gap (206) to enter.
2. The rolling equipment according to claim 1, characterized in that, The first roller pressing device (202) is a first secondary pressing roller (2021). The radius of the first secondary pressing roller (2021) is larger than the radius of the first pre-roller (201). The first secondary pressing roller (2021) is a first initial pressing section (20211) on the side near the first discharge port (1032). The first initial pressing section (20211) and the first pre-roller (201) are arranged opposite to each other to form a first pre-pressing gap (203) for the material (5) flowing out from the first discharge port (1032) to enter. The side of the first initial pressing section (20211) and the first pre-roller (201) used to receive the material (5) entering the first pre-pressing gap (203) is the first feeding side (2031), and the other side used to output the material (5) from the first pre-pressing gap (203) is the first discharge side (2032). The second roller pressing device (205) is a second secondary pressing roller (2051). The radius of the second secondary pressing roller (2051) is larger than the radius of the second pre-roller (204). The second secondary pressing roller (2051) is a second primary pressing section (20511) on the side near the second discharge port (1033). The second primary pressing section (20511) and the second pre-roller (204) are arranged opposite to each other to form a second pre-pressing gap (206) for the material (5) flowing out from the second discharge port (1033) to enter. The side of the second primary pressing section (20511) and the second pre-roller (204) used to receive the material (5) entering the second pre-pressing gap (206) is the second feed side (2061), and the other side used to output the material (5) from the second pre-pressing gap (206) is the second discharge side (2062). The first re-pressing roller (2021) has a first re-pressing section (20212) on the side near the first discharge side (2032), and the second re-pressing roller (2051) has a second re-pressing section (20512) on the side near the second discharge side (2062). The first re-pressing section (20212) and the second re-pressing section (20512) are arranged opposite to each other, forming a re-pressing gap (207) for the material (5) flowing out from the first pre-pressing gap (203) and the second pre-pressing gap (206) to enter.
3. The rolling equipment according to claim 1, characterized in that, The first roller pressing device (202) includes a first secondary pressing roller (2021) and a first primary pressing roller (2022). The first primary pressing roller (2022) is arranged opposite to the first pre-roller (201) to form a first pre-roll pressing gap (203) for material (5) flowing out from the first discharge port (1032) to enter. The side of the first primary pressing roller (2022) and the first pre-roller (201) used to receive the material (5) entering the first pre-roll pressing gap (203) is the first feed side (2031), and the other side used to output the material (5) from the first pre-roll pressing gap (203) is the first discharge side (2032). The second roller pressing device (205) includes a second secondary pressing roller (2051) and a second primary pressing roller (2052). The second primary pressing roller (2052) is arranged opposite to the second pre-pressing roller (204) to form a second pre-pressing gap (206) for material (5) flowing out from the second discharge port (1033) to enter. The side of the second primary pressing roller (2052) and the second pre-pressing roller (204) used to receive the material (5) entering the second pre-pressing gap (206) is the second feed side (2061), and the other side used to output the material (5) from the second pre-pressing gap (206) is the second discharge side (2062). The first re-pressing roller (2021) is located on the first discharge side (2032), and the second re-pressing roller (2051) is located on the second discharge side (2062). The first re-pressing roller (2021) and the second re-pressing roller (2051) are arranged opposite to each other to form a re-pressing gap (207) for material (5) flowing out from the first pre-pressing gap (203) and the second pre-pressing gap (206) to enter.
4. The rolling equipment according to any one of claims 1 to 3, characterized in that, At least one third discharge port (1034) is provided between the first discharge port (1032) and the second discharge port (1033). The material (5) flowing out of the third discharge port (1034) is provided with a third pre-roller (208) and a fourth pre-roller (209) arranged opposite to each other. The third pre-roller (208) and the fourth pre-roller (209) are located on the side of the compound roller pressure gap (207) for the material (5) flowing out from the first pre-roll pressure gap (203) and the second pre-roll pressure gap (206) to enter.
5. The rolling equipment according to any one of claims 1 to 3, characterized in that, The feeding assembly (1) includes a housing (104) and a partition (105). A receiving cavity (1041) is formed inside the housing (104). At least a portion of the structure of the partition (105) is housed in the receiving cavity (1041). The partition (105) divides the receiving cavity (1041) into a plurality of sequentially arranged sub-material cavities (101). The housing (104) has a corresponding discharge port (1031) at a location corresponding to each of the sub-material cavities (101). And / or, the housing (104) of the feeding assembly (1) is provided with a baffle plate (106) between adjacent discharge ports (1031).
6. The rolling equipment according to claim 5, characterized in that, At least another portion of the structure of the separator (105) passes through the side of the housing (104) where the outlet (1031) is formed, and is located between adjacent outlets (1031).
7. The rolling equipment according to claim 6, characterized in that, The housing (104) of the feeding assembly (1) is provided with a clearance opening (1042) between adjacent discharge ports (1031). ， The separator (105) includes a separator section (1051) and a blocking section (1052). The separator section (1051) is located in the receiving cavity (1041), and the blocking section (1052) passes through the housing (104) along the clearance opening (1042) and is located between adjacent discharge ports (1031).
8. The rolling equipment according to claim 7, characterized in that, A baffle plate (106) is provided between adjacent discharge ports (1031). The baffle plate (106) is located at one end of the blocking section (1052) away from the dividing section (1051). The baffle plate (106) is located on the side of the material (5) flowing out of the adjacent discharge port (1031) and is in interlock with the adjacent pre-roller. The baffle plate (106) has a guide surface (1061) for blocking the material (5), the guide surface (1061) being inclined along the feed side of the blocking section (1052) to the pre-roller adjacent to it. The receiving cavity (1041) is inclined on the inner wall near the discharge port (1031).
9. A composite electrode preparation apparatus, characterized in that, include: At least one rolling apparatus as described in any one of claims 1 to 8, for rolling the electrode layer (6); The third roll assembly (4) is used to combine the electrode layer (6) with the current collector (7).
10. The composite electrode preparation apparatus according to claim 9, characterized in that, The rolling equipment includes two, with the first roll pressing device (202) and the second roll pressing device (205) of the two rolling equipment located on opposite sides of the third roll assembly (4); It also includes an unwinding assembly (8) and a winding assembly (9), through which the current collector (7) rotates to continuously pass through the third roll assembly (4).