Electrode film forming apparatus

Abstract

The utility model discloses electrode film forming equipment which comprises a rolling part, the rolling part comprises a calendaring roller and an adjusting roller, a first rolling gap is formed between the calendaring roller and the adjusting roller, and the first rolling gap is used for containing entering powder. The adjusting roller comprises a first roller body, a second roller body, a third roller body and an adjusting belt arranged on the first roller body, the second roller body and the third roller body in a sleeving mode, and the rolling area of the adjusting roller can be adjusted at least by adjusting the position of the third roller body. Therefore, the equivalent diameter of the adjusting roller can be changed by adjusting the position of the third roller, so that the rolling area of the third roller is adjusted, the effect that the roller diameter is adjustable can be achieved under the condition that the roller is not replaced, the electrode film forming equipment can meet the dry method film forming requirements of different electrode materials, the maintenance cost of the electrode film forming equipment is reduced, and the maintenance time of the electrode film forming equipment is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, the utility model relates to an electrode film forming device. Background Art

[0002] In the production process of batteries, the performance of the electrode sheets will directly affect the performance of the finished batteries. At present, the manufacturing methods of electrode sheets include two types: dry electrode technology and wet electrode technology. Among them, dry electrode technology is favored by battery manufacturers due to its low energy consumption, low cost and good environmental protection.

[0003] In the powder film forming process, the currently widely used rolling devices are mostly two-roll or multi-roll structures, and the film forming quality is controlled by adjusting parameters such as roll diameter, roll gap and pressure. However, for powders of different materials, it is often necessary to replace the rolls to adapt to the subsequent rolling process, resulting in relatively high costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a new technical solution for an electrode film forming device.

[0005] According to one aspect of the utility model, an electrode film forming device is provided, including:

[0006] A rolling part, the rolling part includes a calender roll and an adjusting roll, a first rolling gap is formed between the calender roll and the adjusting roll, the first rolling gap is used to accommodate the entering powder, the adjusting roll includes a first roll, a second roll, a third roll and an adjusting belt sleeved on the first roll, the second roll and the third roll, and at least by adjusting the position of the third roll, the rolling area of the adjusting roll can be adjusted.

[0007] Optionally, the adjusting roll has a first equivalent diameter and a second equivalent diameter, and the third roll has a first position and a second position;

[0008] When the third roll is in the first position, the diameter of the adjusting roll is the first equivalent diameter; when the third roll is in the second position, the diameter of the adjusting roll is the second equivalent diameter, and the first equivalent diameter is different from the second equivalent diameter.

[0009] Optionally, the first equivalent diameter is greater than the second equivalent diameter, and during the movement of the third roll from the first position to the second position, the rolling area of the adjusting roll decreases.

[0010] Optionally, when the third roller is in the first position, there is a first included angle between the axial connection line of the first roller and the calender roller and the adjustment belt; when the third roller is in the second position, there is a second included angle between the axial connection line of the first roller and the calender roller and the adjustment belt, and the second included angle is smaller than the first included angle.

[0011] Optionally, the adjustment roller includes a plurality of the third rollers, and the positions of at least some of the third rollers are adjustable.

[0012] Optionally, the roller pressing part further includes a first driving member, the output end of the first driving member is connected to the first roller, and under the drive of the first driving member, the first roller can rotate and drive the adjustment belt to move, so that the adjustment belt drives the second roller and the third roller to rotate.

[0013] Optionally, along the horizontal direction, the position of the third roller is adjustable, and the position of the second roller is adjustable.

[0014] Optionally, the roller pressing part includes at least two calender rollers and two adjustment rollers. A second roller pressing gap is formed between the two calender rollers. One adjustment roller is located on the first side of one calender roller, and the other adjustment roller is located on the second side of the other calender roller. The first side and the second side are the sides of the corresponding calender roller away from the second roller pressing gap.

[0015] Optionally, the second roller pressing gap and the first roller pressing gap on one side jointly accommodate and roll a first powder material, and the second roller pressing gap and the first roller pressing gap on the other side jointly accommodate and roll a second powder material. The rolled first powder material, the rolled second powder material, and the current collector sandwiched between the two form a pole piece.

[0016] Optionally, the roller pressing part includes four calender rollers, the four calender rollers are arranged side by side in sequence, a third roller pressing gap is formed between the two middle calender rollers, the second roller pressing gap is formed between the calender rollers on both sides and the adjacent calender rollers, and the adjustment roller is adjacent to the calender roller at the edge.

[0017] Optionally, it further includes two feeding parts, each feeding part is opposite to one first roller pressing gap, and the feeding part is used to supply powder material to the first roller pressing gap.

[0018] Optionally, it further includes an unwinding part and a winding part. The connection line of the unwinding part and the winding part passes through the third roller pressing gap. The unwinding part is used to unwind the current collector, and the winding part is used to wind the formed pole piece.

[0019] Optionally, the rolling part further includes a moving part, the moving part includes a first guide rail and a second driving member, an output end of the second driving member is connected to the third roller, and the third roller can move along the first guide rail under the drive of the second driving member.

[0020] Optionally, the moving part further includes a second guide rail and a third driving member, an output end of the third driving member is connected to the second roller, and the second roller can move along the second guide rail under the drive of the third driving member.

[0021] Optionally, the rolling part further includes a moving part, the moving part includes two third guide rails and two fourth driving members, at least one calender roll and one adjusting roll are arranged on each third guide rail, an output end of each fourth driving member is connected to an adjusting roll, and the adjusting roll can move along the third guide rail under the drive of the fourth driving member to adjust the corresponding first roll pressing gap.

[0022] One technical effect of the present utility model lies in:

[0023] The electrode film forming device includes a rolling part, the rolling part includes a calender roll and an adjusting roll, a first roll pressing gap is formed between the calender roll and the adjusting roll, the first roll pressing gap is used for accommodating the entering powder material, the adjusting roll includes a first roll, a second roll, a third roll and an adjusting belt sleeved on the first roll, the second roll and the third roll, and at least by adjusting the position of the third roll, the roll pressing area of the adjusting roll can be adjusted. With this setting, the equivalent diameter of the adjusting roll can be changed by adjusting the position of the third roll, so as to adjust its roll pressing area, and the effect of adjustable roll diameter can be achieved without replacing the roll, so that the electrode film forming device can adapt to the dry film forming requirements of different electrode materials, and also reduces the maintenance cost and time of the electrode film forming device.

[0024] Through the following detailed description of the exemplary embodiments of the present utility model with reference to the drawings, other features and advantages of the present utility model will become clear. Description of the Drawings

[0025] The drawings forming a part of the specification depict the embodiments of the present utility model and, together with the specification, are used to explain the principles of the present utility model.

[0026] Figure 1 is a schematic diagram of an electrode film forming device according to an embodiment of the present utility model;

[0027] Figure 2 is a schematic diagram of a working state of a rolling part according to an embodiment of the present utility model;

[0028] Figure 3It is another schematic diagram of the working state of a rolling part in an embodiment of the present utility model;

[0029] Figure 4 It is a schematic diagram of a rolling part in an embodiment of the present utility model;

[0030] Figure 5 It is another schematic diagram of a rolling part in an embodiment of the present utility model.

[0031] Explanation of reference numerals:

[0032] 001, first powder material; 002, second powder material; 003, current collector;

[0033] 1, calendering roll; 11, first rolling gap; 12, second rolling gap; 13, third rolling gap; 2, adjusting roll; 21, first roll; 22, second roll; 23, third roll; 24, adjusting belt; 3, feeding part; 4, unwinding part; 5, winding part; 6, moving part; 61, first guide rail; 63, second guide rail; 64, third driving member; 65, third guide rail; 66, fourth driving member; 7, cutting part. Detailed implementation manners

[0034] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation on the present utility model or its application or use.

[0036] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0037] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0039] The present utility model provides an electrode film-forming device, which can be used in the battery production process. Among them, the battery includes a pole piece, and the pole piece can be manufactured by dry electrode technology or wet electrode technology.

[0040] Such asFigure 1 As shown in the figure, the electrode film-forming equipment provided by the present utility model includes:

[0041] A rolling part, the rolling part includes a calender roll 1 and an adjusting roll 2. A first rolling gap 11 is formed between the calender roll 1 and the adjusting roll 2. The first rolling gap 11 is used to accommodate the incoming powder material. The adjusting roll 2 includes a first roll 21, a second roll 22, a third roll 23, and an adjusting belt 24 sleeved on the first roll 21, the second roll 22, and the third roll 23. The rolling area of the adjusting roll 2 can be adjusted by at least adjusting the position of the third roll 23.

[0042] As Figure 1 shown, the calender roll 1 is a part of the driving roll. The calender roll 1 can be rotated by being driven by a motor. The surface of the calender roll 1 is usually covered with a wear-resistant and corrosion-resistant coating so as to be able to adapt to long-time and high-intensity rolling work.

[0043] As Figures 1 to 3 shown, the adjusting roll 2 is composed of a first roll 21, a second roll 22, a third roll 23, and an adjusting belt 24 sleeved on these three rolls. The first roll 21, the second roll 22, and the third roll 23 form a triangular structure, which is convenient for the adjusting belt 24 to be sleeved and tensioned thereon, so as to ensure the rolling effect of the adjusting belt 24. A first rolling gap 11 for the powder material to pass through is formed between the calender roll 1 and the adjacent part of the adjusting belt 24. The powder material is extruded into a sheet structure, that is, a film sheet, by the calender roll 1 and the adjusting belt 24 in the first rolling gap 11. Among them, by controlling the size and shape of the first rolling gap 11, precise adjustment of the rolling thickness of the powder material can be achieved.

[0044] One of the first roll 21 and the second roll 22 is a driving roll, the other of the first roll 21 and the second roll 22 is a driven roll, and the third roll 23 is a tensioning roll. The driving roll is connected to the driving end of the first driving member. Driven by the first driving member, the driving roll can rotate and drive the adjusting belt 24 to move, so that the adjusting belt 24 can drive the driven roll and the tensioning roll to rotate.

[0045] Among them, the adjusting belt 24 can be made of a material with high elasticity and wear resistance, such as rubber or special synthetic materials, to ensure good sealing performance and rolling effect during the adjustment process. In addition, the surface of the adjusting belt 24 can be processed with specific textures or coatings according to needs to optimize the friction force and film layer quality during the rolling process.

[0046] In one embodiment, the first roll 21 and the second roll 22 can be set as the fixed parts of the adjusting roll 2, and the two can keep their relative positions unchanged to provide a stable support frame for the adjusting belt 24.

[0047] In another embodiment, the first roller 21 can also be set as the fixed part of the adjusting roller 2. The position of the first roller 21 remains unchanged, and the position of the second roller 22 is adjustable. The cooperation between the second roller 22 and the third roller 23 can be utilized to adjust the roller pressing area.

[0048] The third roller 23 is a movable component, that is, the position of the third roller 23 can be adjusted in the horizontal direction. For example, the movement of the third roller 23 can be controlled by adjusting mechanisms such as lead screws and hydraulic cylinders. As Figure 2 and Figure 3 shown, the movement of the third roller 23 will drive the deformation of the adjusting belt 24, thereby changing the angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24, that is, changing the equivalent diameter of the adjusting roller 2, and further being able to adjust the area of the roller pressing area of the adjusting roller 2. For example, as Figures 2 to 3 shown, when the angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24 decreases, the effect of reducing the equivalent roller diameter and the roller pressing area can be achieved.

[0049] By introducing the third roller 23 as a movable component and sleeving the adjusting belt 24 on the first roller 21, the second roller 22, and the third roller 23, it is possible to change the angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24, that is, adjust the feeding angle, only by adjusting the position of the third roller 23 without replacing the entire roller body. Thus, the area of the roller pressing area can be adjusted, so as to achieve the effect of adjustable roller diameter without replacing the roller, improve the adjustment accuracy and flexibility of the roller pressing area, enable the electrode film forming equipment to adapt to the dry film forming requirements of different electrode materials, facilitate the optimization of the roller pressing effect, and reduce the maintenance cost and time of the electrode film forming equipment.

[0050] Moreover, according to the properties of the specific electrode material and the requirements for the quality of the target film layer, the position of the third roller 23 can be adjusted to obtain the required roller pressing area, so that the electrode powder can be fully compressed and plastically deformed during the roller pressing process, thereby improving the uniformity and density of the electrode film layer, reducing internal defects and porosity, and enhancing the performance and lifespan of the electrode plate.

[0051] In addition, by adjusting the position of the third roller 23, different roller pressing effects can also be achieved in cooperation with different first roller pressing clearances 11 and / or different roller pressing pressures, which also improves the film forming ability of the electrode film forming equipment.

[0052] Optionally, the adjusting roller 2 has a first equivalent diameter and a second equivalent diameter, and the third roller 23 has a first position and a second position;

[0053] When the third roller 23 is in the first position, the diameter of the adjusting roller 2 is the first equivalent diameter; when the third roller 23 is in the second position, the diameter of the adjusting roller 2 is the second equivalent diameter, and the first equivalent diameter is different from the second equivalent diameter. That is, by adjusting the position of the third roller 23, the equivalent diameter of the adjusting roller 2 can be adjusted, so as to realize the adjustment of the roller pressing area, further change the feeding capacity of the roller pressing part, and meet different feeding requirements.

[0054] Optionally, the first equivalent diameter is greater than the second equivalent diameter. During the process of the third roller 23 moving from the first position to the second position, the area of the roller pressing area of the adjusting roller 2 decreases.

[0055] As Figure 2 shown, the third roller 23 is in the first position; as Figure 3 shown, the third roller 23 is in the second position. During the process from Figures 2 to 3 that is, during the process of the third roller 23 moving from the first position to the second position, the third roller 23 moves away from the calender roller 1, so that the equivalent diameter of the adjusting roller 2 decreases, and thus the area of the roller pressing area of the adjusting roller 2 also decreases.

[0056] Optionally, when the third roller 23 is in the first position, there is a first included angle between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24; when the third roller 23 is in the second position, there is a second included angle between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24, and the second included angle is smaller than the first included angle.

[0057] During the process from Figures 2 to 3 that is, during the process of the third roller 23 moving from the first position to the second position, the included angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24 decreases, so that the equivalent diameter of the adjusting roller 2 decreases, and thus the area of the roller pressing area of the adjusting roller 2 also decreases. Wherein, when both the first roller 21 and the calender roller 1 are spheres, their axial connection is the connection line of the two sphere centers.

[0058] Optionally, the adjusting roller 2 includes a plurality of the third rollers 23, and the positions of at least some of the third rollers 23 are adjustable.

[0059] Specifically, it can be set that the adjusting roller 2 includes a plurality of third rollers 23, and the first roller 21, the second roller 22, the plurality of third rollers 23 and the adjusting belt 24 sleeved thereon form the adjusting roller 2. Among them, it can be set that the positions of some of the third rollers 23 are adjustable and the positions of the other part of the third rollers 23 are fixed; it can also be set that the positions of all the third rollers 23 are adjustable, and all can change the included angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjusting belt 24 by adjusting the positions of the third rollers 23, so as to adjust the roller pressing area.

[0060] Optionally, the rolling part further includes a first driving member, the output end of the first driving member is connected to the first roller 21, and under the drive of the first driving member, the first roller 21 can rotate and drive the adjusting belt 24 to move, so that the adjusting belt 24 drives the second roller 22 and the third roller 23 to rotate, facilitating the extrusion of the powder material into a sheet structure through the calender roll 1 and the adjusting belt 24, that is, forming a diaphragm. Among them, the first driving member includes but is not limited to a motor and a cylinder.

[0061] Optionally, along the horizontal direction, the position of the third roller 23 is adjustable, and the position of the second roller 22 is adjustable. The included angle α between the axial connection line of the first roller 21 and the calender roll 1 and the adjusting belt 24 can be changed by adjusting the positions of the second roller 22 and the third roller 23, thereby adjusting the rolling area.

[0062] Optionally, the rolling part includes at least two calender rolls 1 and two adjusting rolls 2. A second rolling gap 12 is formed between the two calender rolls 1. One adjusting roll 2 is located on the first side of one calender roll 1, and the other adjusting roll 2 is located on the second side of the other calender roll 1. The first side and the second side are the sides of the corresponding calender roll 1 away from the second rolling gap 12.

[0063] Specifically, according to the actual rolling requirements, the rolling part can include two calender rolls 1, three calender rolls 1, four calender rolls 1 or more calender rolls 1. A second rolling gap 12 is formed between adjacent two calender rolls 1. The second rolling gap 12 is used for further rolling processing of the diaphragm rolled through the first rolling gap 11 and adjusting the thickness of the diaphragm.

[0064] Among them, the number of calender rolls 1 is usually an even number, so that the number of calender rolls 1 for the first powder rolling is equal to the number of calender rolls 1 for the second powder rolling, so that the thicknesses of the two diaphragms formed by rolling are kept consistent, and the reliability of the pole piece formed by processing is also improved.

[0065] Optionally, the second rolling gap 12 and the first rolling gap 11 on one side jointly accommodate and roll the first powder material 001, and the second rolling gap 12 and the first rolling gap 11 on the other side jointly accommodate and roll the second powder material 002. The rolled first powder material 001, the rolled second powder material 002 and the current collector 003 sandwiched between the two form a pole piece. Among them, the current collector 003 can be unrolled by the unrolling part 4, and the pole piece can be wound by the winding part 5.

[0066] Optionally, the rolling part includes four calendering rollers 1 which are arranged side by side in sequence. A third rolling gap 13 is formed between the two middle calendering rollers 1, and a second rolling gap 12 is formed between the two calendering rollers 1 on both sides and the adjacent calendering roller 1. Moreover, the adjusting roller 2 is adjacent to the calendering roller 1 at the edge.

[0067] As Figure 1 shown, the two calendering rollers 1 on the left side and the leftmost adjusting roller 2 jointly roll the first powder material to obtain a first diaphragm; the two calendering rollers 1 on the right side and the rightmost adjusting roller 2 jointly roll the second powder material to obtain a second diaphragm. During the process that the powder material passes through the first rolling gap 11, the second rolling gap 12, and then to the third rolling gap 13, its thickness gradually decreases. By arranging two calendering rollers 1 on each side, the thickness of the first diaphragm can be adjusted multiple times, which is convenient for obtaining a diaphragm with the required thickness and also improves the reliability of the electrode film-forming device. The cutting part 7 is used for cutting the corresponding diaphragm to obtain a diaphragm with the required length.

[0068] Optionally, it further includes two feeding parts 3. Each feeding part 3 faces a first rolling gap 11, and the feeding part 3 is used for supplying powder material to the first rolling gap 11.

[0069] As Figure 1 shown, the opening of the feeding part 3 on the left side faces the first rolling gap 11 on the left side, which is convenient for the first powder material to enter the first rolling gap 11 from the feeding part 3; the opening of the feeding part 3 on the right side faces the first rolling gap 11 on the right side, which is convenient for the second powder material to enter the first rolling gap 11 from the feeding part 3. Thus, the synchronous rolling of the first powder material and the second powder material can be realized, and the film-forming efficiency of the electrode film-forming device is also improved.

[0070] Optionally, it further includes an unwinding part 4 and a winding part 5. The connection line between the unwinding part 4 and the winding part 5 passes through the third rolling gap 13. The unwinding part 4 is used for unwinding the current collector 003, and the winding part 5 is used for winding the formed pole piece. As Figure 1 shown, setting the connection line between the unwinding part 4 and the winding part 5 to pass through the third rolling gap 13 can facilitate the current collector 003 to enter the second rolling gap 12 from the unwinding part 4, and also facilitate the pole piece formed by rolling to enter the winding part 5 from the second rolling gap 12.

[0071] Optionally, the rolling part further includes a moving part 6. The moving part 6 includes a first guide rail 61 and a second driving part. The output end of the second driving part is connected to the third roller 23. Under the drive of the second driving part, the third roller 23 can move along the first guide rail 61.

[0072] As Figure 4As shown in the figure, the moving part 6 is used to adjust the position of the third roller 23 to change the included angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjustment belt 24, so as to adjust the roller pressing area. Among them, the moving part 6 may include a first guide rail 61 and a second driving member, connecting the third roller 23 to the output end of the second driving member, so that under the drive of the second driving member, the third roller 23 can move along the first guide rail 61 to achieve position adjustment. Among them, the second driving member includes but is not limited to motors, cylinders and oil cylinders.

[0073] Among them, a first bearing and a first bearing seat can be correspondingly arranged, the third roller 23 is arranged on the first bearing seat through the first bearing, and then the first bearing seat is arranged on the first guide rail 61, so that the third roller 23 can move along the first guide rail 61 under the drive of the first bearing seat.

[0074] Optionally, the moving part 6 further includes a second guide rail 63 and a third driving member 64, the output end of the third driving member 64 is connected to the second roller 22, and under the drive of the third driving member 64, the second roller 22 can move along the second guide rail 63, so that the included angle α between the axial connection line of the first roller 21 and the calender roller 1 and the adjustment belt 24 can be changed by adjusting the positions of the second roller 22 and the third roller 23, so as to adjust the roller pressing area. Among them, the third driving member 64 includes but is not limited to motors, cylinders and oil cylinders.

[0075] Among them, a second bearing and a second bearing seat can be correspondingly arranged, the second roller 22 is arranged on the second bearing seat through the second bearing, and then the second bearing seat is arranged on the second guide rail 63, so that the second roller 22 can move along the second guide rail 63 under the drive of the second bearing seat.

[0076] Among them, a third bearing and a third bearing seat can also be arranged, the first roller 21 is arranged on the third bearing seat through the third bearing, and the first guide rail 61 and the second guide rail 63 are respectively arranged on the third bearing seat.

[0077] Optionally, the roller pressing part further includes a moving part 6, the moving part 6 includes two third guide rails 65 and two fourth driving members 66, at least one calender roller 1 and one adjustment roller 2 are arranged on each third guide rail 65, the output end of each fourth driving member 66 is connected to one adjustment roller 2, and under the drive of the fourth driving member 66, the adjustment roller 2 can move along the third guide rail 65 to adjust the corresponding first roller pressing gap 11.

[0078] As Figure 5As shown in the figure, the fourth driving member 66 on the left drives the adjusting roller 2 on the left to move along the third guide rail 65 and approach or move away from the adjacent calender roll 1, so as to adjust the first roll gap 11 on the left. The fourth driving member 66 on the right drives the adjusting roller 2 on the right to move along the third guide rail 65 and approach or move away from the adjacent calender roll 1, so as to adjust the first roll gap 11 on the right. Among them, the fourth driving member 66 includes but is not limited to motors and cylinders. Among them, the calender roll 1 and the adjusting roller 2 can be respectively arranged on corresponding bearing seats through bearings to ensure the installation reliability of the calender roll 1 and the adjusting roller 2.

[0079] In the above embodiments, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. For the sake of brevity of the text, they will not be elaborated here.

[0080] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An electrode film forming device, characterized in that, Comprising: A rolling part, the rolling part includes a calender roll (1) and an adjusting roll (2), a first rolling gap (11) is formed between the calender roll (1) and the adjusting roll (2), and the first rolling gap (11) is used to accommodate the incoming powder material. The adjusting roll (2) includes a first roll (21), a second roll (22), a third roll (23), and an adjusting belt (24) sleeved on the first roll (21), the second roll (22), and the third roll (23). The rolling area of the adjusting roll (2) can be adjusted by at least adjusting the position of the third roll (23).

2. The electrode film forming apparatus according to claim 1, wherein The adjusting roll (2) has a first equivalent diameter and a second equivalent diameter, and the third roll (23) has a first position and a second position; When the third roll (23) is in the first position, the diameter of the adjusting roll (2) is the first equivalent diameter; when the third roll (23) is in the second position, the diameter of the adjusting roll (2) is the second equivalent diameter, and the first equivalent diameter is different from the second equivalent diameter.

3. The electrode film forming apparatus according to claim 2, wherein, The first equivalent diameter is greater than the second equivalent diameter. During the process of the third roll (23) moving from the first position to the second position, the area of the rolling area of the adjusting roll (2) decreases.

4. The electrode film forming equipment according to claim 2, characterized in that: When the third roll (23) is in the first position, there is a first included angle between the axial connection line of the first roll (21) and the calender roll (1) and the adjusting belt (24); when the third roll (23) is in the second position, there is a second included angle between the axial connection line of the first roll (21) and the calender roll (1) and the adjusting belt (24), and the second included angle is smaller than the first included angle.

5. The electrode film forming equipment according to claim 1, characterized in that The adjusting roll (2) includes a plurality of the third rolls (23), and the positions of at least some of the third rolls (23) are adjustable.

6. The electrode film forming apparatus according to claim 1, characterized in that, The rolling part further includes a first driving member, the output end of the first driving member is connected to the first roll (21), and under the drive of the first driving member, the first roll (21) can rotate and drive the adjusting belt (24) to move, so that the adjusting belt (24) drives the second roll (22) and the third roll (23) to rotate.

7. The electrode film forming apparatus according to claim 1, wherein In the horizontal direction, the position of the third roll (23) is adjustable, and the position of the second roll (22) is adjustable.

8. The electrode film forming apparatus according to claim 1, wherein The rolling part includes at least two calender rolls (1) and two adjusting rolls (2). A second rolling gap (12) is formed between the two calender rolls (1). One adjusting roll (2) is located on the first side of one calender roll (1), and the other adjusting roll (2) is located on the second side of the other calender roll (1). The first side and the second side are the sides of the corresponding calender roll (1) away from the second rolling gap (12).

9. The electrode film forming apparatus according to claim 8, wherein The second rolling gap (12) and the first rolling gap (11) on one side jointly accommodate and roll-press the first powder (001), and the second rolling gap (12) and the first rolling gap (11) on the other side jointly accommodate and roll-press the second powder (002), and the rolled first powder (001), the rolled second powder (002) and the current collector (003) sandwiched between the two form a pole piece.

10. The electrode film forming apparatus according to claim 8, characterized in that, The rolling section includes four calendering rollers (1), which are arranged side by side in sequence. A third rolling gap (13) is formed between the two middle calendering rollers (1), and a second rolling gap (12) is formed between the calendering rollers (1) on both sides and the adjacent calendering rollers (1), and the adjustment roller (2) is adjacent to the calendering roller (1) at the edge.

11. The electrode film forming apparatus according to claim 10, wherein It also includes two feeding parts (3), each of the feeding parts (3) is opposite to one of the first rolling gaps (11), and the feeding parts (3) are used to provide powder to the first rolling gap (11).

12. The electrode film forming apparatus according to claim 11, wherein, It also includes an unwinding portion (4) and a rewinding portion (5), wherein a line connecting the unwinding portion (4) and the rewinding portion (5) passes through the third rolling gap (13), the unwinding portion (4) is used for unwinding the current collector (003), and the rewinding portion (5) is used for rewinding the formed pole piece.

13. The electrode film forming apparatus according to claim 1, wherein The rolling portion further comprises a moving portion (6), wherein the moving portion (6) comprises a first guide rail (61) and a second driving member, wherein an output end of the second driving member is connected to the third roller (23), and under the drive of the second driving member, the third roller (23) can move along the first guide rail (61).

14. The electrode film forming apparatus according to claim 13, wherein, The moving part (6) further includes a second guide rail (63) and a third driving member (64), wherein the output end of the third driving member (64) is connected to the second roller (22), and the second roller (22) can move along the second guide rail (63) under the drive of the third driving member (64).

15. The electrode film forming apparatus according to any one of claims 1 to 12, characterized in that, The rolling part also includes a moving part (6), and the moving part (6) includes two third guide rails (65) and two fourth driving members (66). Each of the third guide rails (65) is provided with at least one calendering roller (1) and one adjustment roller (2). The output end of each of the fourth driving members (66) is connected to one of the adjustment rollers (2). Under the drive of the fourth driving member (66), the adjustment roller (2) can move along the third guide rails (65) to adjust the corresponding first rolling gap (11).

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