A pole piece forming equipment

Abstract

The present invention provides a field of pole piece processing design, and more specifically, relates to a dry powder lithium battery pole piece forming method, wherein a plurality of rollers are arranged side by side, the middle roller gap is used to pass the current collector, and the roller gaps at the two end portions are used to roll-press the composite material powder to obtain upper and lower electrode films, the upper and lower electrode films are respectively bonded to the front and back sides of the current collector, and the pole pieces are formed under the rolling action of the rollers; it also relates to a pole piece forming rolling device, based on the above-mentioned dry powder lithium battery pole piece forming method, including a frame, a control system, a first composite rolling mechanism, and a second composite rolling mechanism. The pole piece forming method adopted by the present invention can make the composite material undergo pre-pressing and then secondary rolling, thereby increasing the compaction density of the pole piece and prolonging the heating time, so that the thickness of the processed pole piece is more uniform. In addition, the roller gap between each adjacent roller can be precisely adjusted according to the actual process to meet higher standard requirements.

Description

Technical Field

[0001] The present invention relates to the field of battery pole piece processing, and more specifically, to a pole piece forming device. Background Art

[0002] As the market share of new energy vehicles continues to rise, people's requirements for the range of electric new energy vehicles are also getting higher and higher. The energy density of power batteries plays a key role in the range of electric new energy vehicles. The processing technology of power battery electrodes also needs to be continuously updated and improved in line with market demand. During the roller pressing process of lithium battery electrodes, the precision requirements for electrodes are getting higher and higher due to the energy density of the battery. The existing process basically consists of batching-slurrying-stirring-coating-rolling production. The process is long and has strict requirements for the formulation of the slurry and the uniformity of the coating. The coating oven is also prone to produce NMP and other gases that are harmful to the human body. Some electrode production equipment uses composite dry powder materials for roller pressing. Since the electrode is only hot-pressed once, it is impossible to achieve more precise and uniform control of the electrode thickness. Therefore, it cannot meet the existing increasingly high requirements for electrode precision. For example, current technical means disclose a dry-process preparation equipment for lithium battery electrodes, in which an unwinding device is used to unwind the coated substrate; a loading device is used to evenly arrange the raw material powder on the coated substrate; a hot pressing device is used to roll the raw material powder into pole pieces, and a winding device is used to wind up the coated substrate and the pole pieces; the preparation equipment only uses two transition rollers for hot pressing, and the time and distance for hot pressing the composite dry powder material on the current collector are short, and the thickness of the pole piece cannot be more accurately and evenly controlled; it cannot meet the existing increasingly high requirements for pole piece precision. Summary of the Invention

[0003] The present invention aims to overcome the problems of the preparation equipment described in the background art above, which only uses two transition rollers for hot pressing, resulting in a short time and distance for hot pressing the composite dry powder material onto the current collector, making it impossible to achieve more precise and uniform control of the thickness of the electrode sheet; and failing to meet the existing increasingly high requirements for electrode sheet precision. The present invention provides an electrode sheet forming device. The present invention can achieve more precise and uniform control of the electrode sheet thickness.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A pole piece forming rolling device comprises a frame and a first composite rolling mechanism and a second composite rolling mechanism located on the frame and arranged side by side, wherein the first composite rolling mechanism and the second composite rolling mechanism respectively comprise a plurality of rollers arranged side by side, a roller gap is formed between two adjacent rollers, and the rotation directions of the adjacent rollers are opposite, the middle roller gap is used for passing the current collector, and the roller gaps at the two end portions are used for rolling the composite material powder to obtain upper and lower electrode films, the upper and lower electrode films are moved to the middle roller gap by the rotation of the pressure rollers, and are respectively bonded to the front and back sides of the current collector, and are formed into pole pieces under the rolling action of the pressure rollers; a pole piece forming channel is separated between the first composite rolling mechanism and the second composite rolling mechanism , one end of the pole piece forming channel is provided with a current collector inlet and the other end is a pole piece outlet, the first composite rolling mechanism is provided with a first roller gap adjustment mechanism at one end away from the second composite rolling mechanism for adjusting the roller gap between each adjacent roller in the first composite rolling mechanism, and the second composite rolling mechanism is provided with a second roller gap adjustment mechanism at one end away from the first composite rolling mechanism for adjusting the roller gap between each adjacent roller in the second composite rolling mechanism and the size of the pole piece forming channel; the first composite rolling mechanism includes three rollers arranged side by side, namely a first roller, a second roller and a third roller, and the pole piece forming channel is formed between the third roller and the second composite rolling mechanism The cam is provided with a first roller gap between the first pressing roller and the second pressing roller, and a first feeding channel is provided above the first roller gap; the first roller gap adjustment mechanism includes two groups of first adjustment units arranged in parallel with each other, the first adjustment unit includes a first oil cylinder, a second oil cylinder, a first linkage frame slidably connected to the inner wall of the frame, and a second linkage frame slidably connected to the inner wall of the first linkage frame, the cylinder body of the first oil cylinder is fixedly arranged on the inner wall of the frame, the piston rod of the first oil cylinder is connected to the outer wall of one end of the first linkage frame, the other end of the first linkage frame is fixedly provided with a first bearing, and the two ends of the second pressing roller are rotatably connected to the corresponding first bearings respectively, the The second oil cylinder and the second linkage frame are located in the frame of the first linkage frame, the cylinder body of the second oil cylinder is fixedly connected to the inner wall of the first linkage frame away from the first bearing, the piston rod of the second oil cylinder is connected to the outer wall of one end of the second linkage frame, a second bearing is provided inside the second linkage frame, the two ends of the first pressure roller are respectively rotatably connected to the corresponding second bearings, and third bearings are respectively provided at positions corresponding to the two ends of the third pressure roller on the frame, and the two ends of the third pressure roller are respectively rotatably connected to the third bearings; the first linkage frame and the second linkage frame are respectively rectangular structures, and each linkage frame and the linkage frame and the frame are movably connected by lining plates.

[0006] Preferably, the number of the pressing rollers is not less than 6, and the upper and lower electrode films are respectively formed by pressing rollers located on both sides of the middle roller gap.

[0007] As a preferred solution, the second composite rolling mechanism includes three pressing rollers arranged side by side, namely the fourth pressing roller, the fifth pressing roller and the sixth pressing roller. The pole piece forming channel is formed between the fourth pressing roller and the third pressing roller. There is a second roller gap between the fifth pressing roller and the sixth pressing roller, and a second feeding channel is provided above the second roller gap.

[0008] Furthermore, the second roller gap adjustment mechanism includes two groups of second adjustment units arranged parallel to each other, the second adjusting unit includes a third oil cylinder, a third linkage frame slidably connected to the inner wall of the frame, and a fourth oil cylinder, a fourth linkage frame, a fifth oil cylinder and a fifth linkage frame located in the third linkage frame, the fourth linkage frame is slidably connected to the inner wall of the third linkage frame, the cylinder body of the third oil cylinder is fixedly arranged on the inner wall of the frame, the piston rod of the third oil cylinder is connected to the outer wall of one end of the third linkage frame, the other end of the third linkage frame is provided with a fourth bearing, and the two ends of the fourth pressure roller are rotatably connected to the corresponding fourth bearing respectively; the cylinder body of the fourth oil cylinder is fixedly arranged on the far side of the third linkage frame The cam is connected to the transmission gear of the piston rod of the fourth oil cylinder and the transmission gear of the piston rod of the fifth oil cylinder is connected to the outer wall of one end of the fourth linkage frame. The other end of the fourth linkage frame is provided with a fifth bearing. The two ends of the fifth pressure roller are rotatably connected with the corresponding fifth bearing respectively. The fifth oil cylinder and the fifth linkage frame are located in the frame of the fourth linkage frame. The fifth linkage frame is slidably connected to the inner wall of the fourth linkage frame. The cylinder body of the fifth oil cylinder is fixedly connected to the inner wall of the fourth linkage frame away from the fourth bearing. The piston rod of the fifth oil cylinder is connected to the outer wall of one end of the fifth linkage frame. The interior of the fifth linkage frame is provided with a sixth bearing. The two ends of the sixth pressure roller are rotatably connected with the corresponding sixth bearing respectively.

[0009] Furthermore, the first cylinder, the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder are respectively provided with displacement sensors for detecting the telescopic stroke of the corresponding cylinder, and the displacement sensors are independently connected to the control system; the first cylinder, the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder and the sixth cylinder are respectively hydraulically controlled by corresponding servo hydraulic control valves, and the servo hydraulic control valves are independently connected to the control system.

[0010] Furthermore, the piston rods of the first oil cylinder, the second oil cylinder, the third oil cylinder, the fourth oil cylinder, the fifth oil cylinder and the sixth oil cylinder are parallel to each other.

[0011] Furthermore, the third linkage frame, the fourth linkage frame and the fifth linkage frame are respectively rectangular structures, and each linkage frame and the linkage frame and the frame are movably connected through lining plates.

[0012] Compared with the prior art, the beneficial effects are:

[0013] 1. The present invention adopts a dry preparation process and a six-roller rolling structure. The added dry powder composite material undergoes three processes of pre-pressing, secondary calendering and final pressing and forming in sequence, so that the composite material is first pre-pressed and then subjected to secondary rolling. The compaction density of the electrode becomes larger, the heating time becomes longer, and the roller gap between each adjacent pressing roller can be accurately adjusted according to the actual process, so that the thickness of the processed and formed electrode is more uniform and meets higher standard requirements; and the process of this embodiment is completely different from the previous process, is simpler, reduces the process flow such as formula mixing, coating, and oven, and makes the production cost of the electrode lower.

[0014] 2. All oil cylinders in the present invention are equipped with displacement sensors, and the hydraulic pressure of the oil cylinder adopts a servo hydraulic system, which controls the roller gap with higher precision, and realizes the precision of controlling each roller gap separately, so that the final electrode thickness is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the principle of Example 1.

[0016] Figure 2 It is a schematic diagram of the overall structure of Example 2.

[0017] Figure 3 This is a schematic diagram of the arrangement structure of each pressing roller in Example 2. DETAILED DESCRIPTION

[0018] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0019] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0021] Example 1

[0022] This embodiment provides a dry powder lithium battery pole piece forming method, referring to Figure 1 The method is to arrange 6 pressing rollers side by side to form 5 roller gaps, and make the rotation directions of the adjacent 2 pressing rollers opposite, add the current collector 41 from the upper end of the middle roller gap, and add the composite material powder from the roller gaps at both ends respectively. After the composite material powder is rolled through 2+N roller gaps in sequence, it forms a pole piece composite material 40 and reaches the two sides of the current collector 41 respectively. Under the rolling action of the pressing rollers on both sides of the middle roller gap, the pole piece composite material 40 is bonded to the current collector 41 to form a pole piece 42.

[0023] like Figure 1 As shown in the figure, 6 pressure rollers are laid out side by side to form a total of 5 roller gaps. Composite material powder is added to the first feeding channel 101 set on the leftmost side and the second feeding channel 102 set on the rightmost roller gap. The pressure rollers on both sides of the roller gap pre-press the powder material. The composite material powder is pre-pressed and rolled twice after the pre-pressing of the left and right roller gaps, and finally passes through the middle roller gap together with the current collector 41. The pressure rollers on both sides of the middle roller gap make the electrode composite material 40 and the current collector 41 bonded together. In actual production, the width of each roller gap can be controlled by a servo valve through the oil cylinder.

[0024] The dry powder composite material added in this embodiment undergoes three processes in sequence: pre-pressing, secondary calendering, and final pressing. This process, which first pre-presses the composite material and then undergoes secondary rolling, increases the compaction density of the electrode and prolongs the heating time, making the thickness of the processed electrode more uniform and meeting higher standards. Furthermore, the process of this embodiment is completely different from previous processes and is more concise, eliminating process steps such as formula mixing, coating, and oven drying, thereby reducing the production cost of the electrode.

[0025] Example 2

[0026] like Figure 2 and Figure 3As shown, a pole piece forming rolling device is provided, based on the dry powder lithium battery pole piece forming method in Example 1, and the rolling device includes a frame 100 and a first composite rolling mechanism and a second composite rolling mechanism located on the frame 100 and arranged side by side, the first composite rolling mechanism includes three pressure rollers arranged side by side, and the second composite rolling mechanism also includes three pressure rollers arranged side by side, and the rotation directions of each adjacent two pressure rollers are opposite; a pole piece forming channel 34 is separated between the first composite rolling mechanism and the second composite rolling mechanism, one end of the pole piece forming channel 34 is provided with a current collector inlet and the other end is a pole piece outlet, the first composite rolling mechanism is provided with a first roller gap adjustment mechanism for adjusting the roller gap between each adjacent pressure roller in the first composite rolling mechanism at one end away from the second composite rolling mechanism, and the second roller gap adjustment mechanism is provided with a second roller gap adjustment mechanism for adjusting the roller gap between each adjacent pressure roller in the second composite rolling mechanism and the size of the pole piece forming channel 34 at one end away from the first composite rolling mechanism. The control system is independently controlled and connected to the first roller gap adjustment mechanism and the second roller gap adjustment mechanism respectively. In this way, the first composite roller pressing mechanism and the second composite roller pressing mechanism are both provided with three rollers, and two roller gaps are formed respectively. The rollers rotate under the drive of the external transmission device, and the rotation directions of adjacent rollers are opposite to each other. Figure 1 As shown by the middle arrow, dry powder composite materials are added from the upper ends of the two roller gaps farthest from both sides of the pole piece forming channel 34. After rolling, the dry powder composite materials form a pole piece composite material 40 with relatively uniform thickness. The rotation directions between adjacent pressing rollers are opposite to each other, which can ensure that the pole piece composite material 40 after rolling (the bold part in the figure is the pole piece composite material 40 after pre-pressing or secondary calendering) can move in an S-shaped path along the flatly arranged pressing rollers, and the two S-shaped path pole piece forming channels 34 are symmetrically arranged. Generally, the upper end of the pole piece forming channel 34 is the current collector inlet, and the lower end is the pole piece outlet. When the current collector 41 passes through the pole piece forming channel 34 from top to bottom, the pole piece composite materials 40 on both sides also have the same running direction as the current collector 41, and are finally pressed and bonded to the current collector 41 to form a pole piece 42, which is sent out from the pole piece outlet. In this embodiment, the width of each roller gap is controlled by the control system, thereby controlling the thickness of the pressed electrode composite material 40. In addition, the electrode composite material 40 is rolled on the pressure roller for a longer time and the rolling is more uniform. Ultimately, the forming thickness of the electrode 42 is accurately controlled, and the forming thickness of the electrode 42 is also made more uniform.

[0027] In this embodiment, the first composite rolling mechanism includes three pressing rollers arranged side by side, and the three pressing rollers are respectively a first pressing roller 1, a second pressing roller 2 and a third pressing roller 3. A pole piece forming channel 34 is formed between the third pressing roller 3 and the second composite rolling mechanism. A first roller gap 31 is provided between the first pressing roller 1 and the second pressing roller 2, and a first feeding channel 101 is provided above the first roller gap 31; wherein, the first roller gap adjustment mechanism includes two groups of first adjustment units 10 arranged side by side with each other, and the first adjustment unit 10 includes a first oil cylinder 11, a second oil cylinder 13, a first linkage frame 12 slidably connected to the inner wall of the frame 100, and a second linkage frame 14 slidably connected to the inner wall of the first linkage frame 12, the cylinder body of the first oil cylinder 11 is fixedly provided on the inner wall of the frame 100, and the first oil cylinder The piston rod of 11 is connected to the outer wall of one end of the first linkage frame 12, and the other end of the first linkage frame 12 is fixedly provided with a first bearing 16. The two ends of the second pressure roller 2 are respectively rotatably connected to the corresponding first bearing 16. The second oil cylinder 13 and the second linkage frame 14 are located in the frame of the first linkage frame 12. The cylinder body of the second oil cylinder 13 is fixedly connected to the inner wall of the first linkage frame 12 away from the first bearing 16. The piston rod of the second oil cylinder 13 is connected to the outer wall of one end of the second linkage frame 14. A first bearing 15 is provided inside the second linkage frame 14. The two ends of the first pressure roller 1 are respectively rotatably connected to the corresponding first bearing 15. Third bearings 17 are respectively provided at the corresponding positions at both ends of the third pressure roller 3 on the frame 100, and the two ends of the third pressure roller 3 are respectively rotatably connected to the third bearing 17. In this way, two roller gaps are formed between the three pressure rollers, the position of the third pressure roller 3 is fixed, and the first pressure roller 1 and the second pressure roller 2 can be adjusted by the first adjusting unit 10. The first adjusting unit 10 has two groups, and one group is connected to each end of the pressure roller, and they work together to adjust the positions of the first pressure roller 1 and the second pressure roller 2 respectively. Specifically, the first linkage frame 12 is larger than the second linkage frame 14. The first linkage frame 12 surrounds the second oil cylinder 13 and the second linkage frame 14 together, and the second oil cylinder 13 is fixed on the inner wall of the first linkage frame 12. When the first oil cylinder 11 is extended, the first pressure roller 1 and the second pressure roller 2 are driven to move toward the third pressure roller 3 at the same time through the first linkage frame 12, so that the second pressure roller 2 and the third pressure roller The roller gap between the rollers 3 is reduced, while the first pressure roller 1 and the second pressure roller 2 are relatively stationary, and the roller gap between the first pressure roller 1 and the second pressure roller 2 does not change; when the second oil cylinder 13 is pushed, the first pressure roller 1 is directly driven to move toward the second pressure roller 2 through the second linkage frame 14, thereby reducing the roller gap between the first pressure roller 1 and the second pressure roller 2; at this time, the positions of the second pressure roller 2 and the third pressure roller 3 are fixed, so the roller gap distance does not change; through such a clever "frame within a frame" structural design, the position of each pressure roller is adjusted separately, and then the spacing of each roller gap is adjusted separately and accurately, and the entire adjustment mechanism occupies less space, making the overall equipment smaller in size, simple and clever in structure, and wider in scope of application.

[0028] In this embodiment, the second composite rolling mechanism includes three rollers arranged side by side, namely the fourth roller 4, the fifth roller 5 and the sixth roller 6. A pole piece forming channel 34 is formed between the fourth roller 4 and the third roller 3. A second roller gap 32 is separated from the fifth roller 5 and the sixth roller 6. A second feeding channel 102 is provided above the second roller gap 32. The second roller gap adjustment mechanism includes two groups of second adjustment units 20 arranged in parallel with each other. The second adjustment unit 20 includes a third oil cylinder 21 and a third linkage frame 2 slidably connected to the inner wall of the frame 100. 2 and the fourth oil cylinder 23, the fourth linkage frame 24, the fifth oil cylinder 25 and the fifth linkage frame 26 located in the third linkage frame 22, the fourth linkage frame 24 is slidably connected to the inner wall of the third linkage frame 22, the cylinder body of the third oil cylinder 21 is fixedly arranged on the inner wall of the frame 100, the piston rod of the third oil cylinder 21 is connected to the outer wall of one end of the third linkage frame 22, the other end of the third linkage frame 22 is provided with a fourth bearing 29, and the two ends of the fourth pressure roller 4 are respectively rotatably connected to the corresponding fourth bearing 29; the cylinder body of the fourth oil cylinder 23 is fixedly arranged on the inner wall of the third linkage frame 22 On the inner wall of the triple linkage frame 22 away from the third bearing 17, the piston rod of the fourth oil cylinder 23 is connected to the outer wall of one end of the fourth linkage frame 24, and the other end of the fourth linkage frame 24 is provided with a fifth bearing 28, and the two ends of the fifth pressure roller 5 are respectively rotatably connected with the corresponding fifth bearing 28; the fifth oil cylinder 25 and the fifth linkage frame 26 are located in the frame of the fourth linkage frame 24, and the fifth linkage frame 26 is slidably connected to the inner wall of the fourth linkage frame 24, and the cylinder body of the fifth oil cylinder 25 is fixed to the inner wall of the fourth linkage frame 24 away from the fourth bearing 29. The piston rod of the fifth oil cylinder 25 is connected to the outer wall of one end of the fifth linkage frame 26, and a sixth bearing 27 is provided inside the fifth linkage frame 26. The two ends of the sixth pressure roller 6 are rotatably connected to the corresponding sixth bearing 27 respectively; the piston rods of the first oil cylinder 11, the second oil cylinder 13, the third oil cylinder 21, the fourth oil cylinder 23, the fifth oil cylinder 25 and the sixth oil cylinder are parallel to each other; the first linkage frame 12, the second linkage frame 14, the third linkage frame 22, the fourth linkage frame 24 and the fifth linkage frame 26 are respectively rectangular structures; the frame 100 is made of stainless steel. The structural principle of the second composite rolling mechanism is similar to that of the first composite rolling mechanism, except that the position of each of the three rollers in the second composite rolling mechanism can be adjusted by the fourth roller 4, the fifth roller 5, and the sixth roller 6, respectively. This allows for adjustment of the width of the electrode forming channel 34 (the gap between the third and fourth rollers 3 and 4), the gap between the fourth and fifth rollers 4 and 5, and the gap between the fifth and sixth rollers 5 and 6, respectively. Furthermore, the third linkage frame 22, the fourth linkage frame 24, and the fifth linkage frame 26 are configured as a double-frame-within-frame structure, operating in a similar manner. The cylinder body of each cylinder is connected to the linkage frame with screws, and the piston rod of the cylinder is also connected to the corresponding linkage frame or bearing seat with screws.

[0029] In this embodiment, each of the first, second, third, fourth, fifth, and sixth cylinders 11, 13, 21, 23, 25, and 26 is equipped with a displacement sensor for detecting the corresponding cylinder's telescopic stroke. The control system is independently connected to the displacement sensor. Each of the first, second, third, fourth, fifth, and sixth cylinders is hydraulically controlled via a corresponding servo hydraulic valve. The control system is independently connected to the servo hydraulic valve. Thus, all cylinders are equipped with displacement sensors, and the hydraulic pressure of the cylinders utilizes a servo hydraulic system, enabling more precise control of the roll gap and achieving precise control of each roll gap, thereby ensuring uniform thickness of the final pole piece 42.

[0030] The working principle of this embodiment is as follows: The roller press in this embodiment is mainly composed of six rollers to form an integrated electrode sheet rolling device. After the composite material powder (positive electrode material and binder or negative electrode material and binder) is evenly mixed, it is added to the first roller gap 31 and the second roller gap 32 from the first feeding channel 101 and the second feeding channel 102 respectively. In order to distinguish other roller gaps, it is assumed that the roller gap between the second roller 2 and the third roller 3 is the third roller gap 33, the roller gap between the third roller 3 and the fourth roller 4 is the fourth roller gap (i.e., the electrode sheet forming channel 34), and the roller gap between the fourth roller 4 and the fifth roller 5 is the fifth roller gap 35. The rollers on both sides of the first roller gap 31 and the second roller gap 32 pre-press the powder material. The width of the first roller gap 31 is controlled by a servo valve via two second oil cylinders 13 arranged side by side, and the second roller gap 32 is controlled by two fifth oil cylinders 25 arranged side by side. After pre-pressing through the first roller gap 31 and the second roller gap 32, the composite material powder moves in an S-shaped direction and directly enters the third roller gap 33 and the fifth roller gap 35 for secondary rolling. The third roller gap 33 is controlled by the servo valve through the first oil cylinder 11, and the fifth roller gap 35 is controlled by the servo valve through the fourth oil cylinder 23; finally, the electrode composite materials 40 on both sides pass through the electrode forming channel 34 together with the current collector 41, so that the electrode composite material 40 and the current collector 41 are bonded together, and the width of the electrode forming channel 34 is controlled by the servo valve through the third oil cylinder 21.

[0031] This embodiment utilizes a dry preparation process, employing a six-roller pressing structure. The added dry powder composite material undergoes three steps: pre-pressing, secondary calendering, and final pressing to form the electrode composite material 40. This increases the rolling distance and time of the electrode composite material 40, and the gap between each adjacent pressing roller can be precisely adjusted according to the actual process. This ensures a more uniform thickness of the processed electrode, meeting higher standards. Furthermore, the process of this embodiment is completely different from previous processes, being more concise and eliminating process steps such as formula mixing, coating, and oven drying, thereby reducing the production cost of the electrode.

[0032] Example 3

[0033] This embodiment is similar to embodiment 2, except that: in this embodiment, the first composite rolling mechanism has five rollers arranged side by side, and the first adjustment mechanism 10 has undergone corresponding structural changes, using four oil cylinders for independent adjustment. The linkage frame is arranged in a four-fold "frame within a frame" structure. This extends the rolling distance and time of the electrode composite material 40 on one side to accommodate different processing requirements.

[0034] Example 4

[0035] This embodiment is similar to embodiment 3, except that the second composite rolling mechanism has five rollers arranged side by side, and the second adjustment mechanism 20 undergoes corresponding structural changes, employing five oil cylinders to adjust the positions of the rollers. The linkage frame is configured using a five-fold "frame-within-frame" structure. This extends the rolling distance and time of the electrode composite material 40 on one side, adapting to different processing requirements.

[0036] Example 5

[0037] This embodiment is similar to embodiment 3, with the difference being that, in this embodiment, five pressure rollers are arranged side by side in both the first composite rolling mechanism and the second composite rolling mechanism; and the first adjustment mechanism 10 undergoes corresponding structural changes, using four oil cylinders to adjust them separately, and the linkage frame is set up through a four-fold "frame within a frame" structure. The second adjustment mechanism 20 undergoes corresponding structural changes, using five oil cylinders to adjust the positions of the pressure rollers separately, and the linkage frame is set up through a five-fold "frame within a frame" structure. In this way, the rolling distance and time of the electrode composite materials 40 on both sides can be extended to meet different processing requirements. Obviously, on the basis of this embodiment, an even number of pressure rollers can be added to each side simultaneously or individually. The principles are the same and will not be described in detail here.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pole piece forming roller pressing device, characterized in that: The invention comprises a frame (100) and a first composite rolling mechanism and a second composite rolling mechanism located on the frame (100) and arranged side by side, wherein an end of the first composite rolling mechanism away from the second composite rolling mechanism is provided with a first roller gap adjustment mechanism for adjusting the roller gaps between adjacent rollers in the first composite rolling mechanism; The first composite roller pressing mechanism comprises three pressing rollers arranged side by side, namely a first pressing roller (1), a second pressing roller (2) and a third pressing roller (3); a first roller gap (31) is provided between the first pressing roller (1) and the second pressing roller (2); and a first feeding channel (101) is provided above the first roller gap (31); The first roller gap adjustment mechanism comprises two groups of first adjustment units (10) arranged in parallel with each other, the first adjustment unit (10) comprising a first oil cylinder (11), a second oil cylinder (13), a first linkage frame (12) slidably connected to the inner wall of the frame (100), and a second linkage frame (14) slidably connected to the inner wall of the first linkage frame (12), the cylinder body of the first oil cylinder (11) is fixedly arranged on the inner wall of the frame (100), the piston rod of the first oil cylinder (11) is connected to the outer wall of one end of the first linkage frame (12), the other end of the first linkage frame (12) is fixedly provided with a first bearing (16), and the two ends of the second pressure roller (2) are respectively rotatably connected to the corresponding first bearing (16) The second oil cylinder (13) and the second linkage frame (14) are located in the frame of the first linkage frame (12); the cylinder body of the second oil cylinder (13) is fixedly connected to the inner wall of the first linkage frame (12) away from the first bearing (16); the piston rod of the second oil cylinder (13) is connected to the outer wall of one end of the second linkage frame (14); a second bearing (15) is provided inside the second linkage frame (14); the two ends of the first pressure roller (1) are respectively rotatably connected to the corresponding second bearing (15); the frame (100) is provided with a third bearing (17) at the corresponding positions at the two ends of the third pressure roller (3); the two ends of the third pressure roller (3) are respectively rotatably connected to the third bearing (17); The first linkage frame (12) and the second linkage frame (14) are respectively rectangular structures, and each linkage frame and the linkage frame and the frame are movably connected via lining plates.

2. The pole piece forming rolling equipment according to claim 1, characterized in that: The first composite rolling mechanism and the second composite rolling mechanism each include a plurality of rollers arranged side by side, a roller gap is formed between two adjacent rollers, and the rotation directions of the adjacent rollers are opposite, the middle roller gap is used to pass the current collector (41), and the roller gaps at both ends are used to roll-press the composite material powder to obtain upper and lower electrode films, the upper and lower electrode films are moved to the middle roller gap by the rotation of the rollers, and are respectively bonded to the front and back sides of the current collector, and form pole pieces under the rolling action of the rollers; A pole piece forming channel (34) is provided between the first composite rolling mechanism and the second composite rolling mechanism, wherein one end of the pole piece forming channel (34) is provided with a current collector inlet and the other end is a pole piece outlet; The second composite rolling mechanism is provided with a second roller gap adjustment mechanism at one end away from the first composite rolling mechanism for adjusting the roller gap between adjacent rollers in the second composite rolling mechanism and the size of the pole piece forming channel (34); The pole piece forming channel (34) is formed between the third pressing roller (3) and the second composite rolling mechanism.

3. The pole piece forming rolling equipment according to claim 2, characterized in that: The upper and lower electrode films are respectively formed by rollers located on both sides of the middle roller gap.

4. The pole piece forming rolling equipment according to claim 2, characterized in that: The second composite rolling mechanism comprises three pressing rollers arranged side by side, namely a fourth pressing roller (4), a fifth pressing roller (5) and a sixth pressing roller (6); the pole piece forming channel (34) is formed between the fourth pressing roller (4) and the third pressing roller (3); a second roller gap (32) is spaced between the fifth pressing roller (5) and the sixth pressing roller (6); and a second feeding channel (102) is provided above the second roller gap (32).

5. The pole piece forming rolling equipment according to claim 4, characterized in that: The second roller gap adjustment mechanism comprises two groups of second adjustment units (20) arranged in parallel with each other, the second adjustment unit (20) comprises a third oil cylinder (21), a third linkage frame (22) slidably connected to the inner wall of the frame (100), and a fourth oil cylinder (23), a fourth linkage frame (24), a fifth oil cylinder (25) and a fifth linkage frame (26) located in the frame of the third linkage frame (22), the fourth linkage frame (24) is slidably connected to the inner wall of the third linkage frame (22), the cylinder body of the third oil cylinder (21) is fixedly arranged on the inner wall of the frame (100), the piston rod of the third oil cylinder (21) is connected to the outer wall of one end of the third linkage frame (22), the other end of the third linkage frame (22) is provided with a fourth bearing (29), and the two ends of the fourth pressure roller (4) are respectively rotatably connected to the corresponding fourth bearing (29); the cylinder body of the fourth oil cylinder (23) is fixedly arranged on the inner wall of the third linkage frame (2 2) On the inner side wall away from one end of the third bearing, the piston rod of the fourth oil cylinder (23) is connected to the outer side wall of one end of the fourth linkage frame (24), and the other end of the fourth linkage frame (24) is provided with a fifth bearing (28), and the two ends of the fifth pressure roller (5) are respectively rotatably connected to the corresponding fifth bearing (28); the fifth oil cylinder (25) and the fifth linkage frame (26) are located in the frame of the fourth linkage frame (24), and the fifth linkage frame (26) is slidably connected to the inner wall of the fourth linkage frame (24), the cylinder body of the fifth oil cylinder (25) is fixedly connected to the inner side wall of the fourth linkage frame (24) away from one end of the fourth bearing (29), the piston rod of the fifth oil cylinder (25) is connected to the outer side wall of one end of the fifth linkage frame (26), and a sixth bearing (27) is provided inside the fifth linkage frame (26), and the two ends of the sixth pressure roller (6) are respectively rotatably connected to the corresponding sixth bearing (27).

6. The pole piece forming rolling equipment according to claim 2, characterized in that: The first oil cylinder (11), the second oil cylinder (13), the third oil cylinder (21), the fourth oil cylinder (23), the fifth oil cylinder (25) and the sixth oil cylinder are each provided with a displacement sensor for detecting the telescopic stroke of the corresponding oil cylinder, and the displacement sensors are each independently connected to the control system; the first oil cylinder (11), the second oil cylinder (13), the third oil cylinder (21), the fourth oil cylinder (23), the fifth oil cylinder (25) and the sixth oil cylinder are each hydraulically controlled by a corresponding servo hydraulic control valve, and the servo hydraulic control valve is each independently connected to the control system.

7. The pole piece forming rolling equipment according to claim 2, characterized in that: The piston rods of the first oil cylinder (11), the second oil cylinder (13), the third oil cylinder (21), the fourth oil cylinder (23), the fifth oil cylinder (25), and the sixth oil cylinder are parallel to each other.

8. The pole piece forming rolling equipment according to claim 5, characterized in that: The third linkage frame (22), the fourth linkage frame (24) and the fifth linkage frame (26) are respectively rectangular structures, and each linkage frame and the linkage frame and the frame are movably connected through lining plates.

Images