Extrusion screw and extruder for preparing battery slurry

Abstract

The utility model relates to an extrusion screw for preparing battery slurry and an extruder, and belongs to the technical field of battery slurry preparation, since a first material blocking section, a feeding section and a second material blocking section are sequentially arranged in the axis direction of the extrusion screw, supporting bearings and sealing structures can be mounted at the two ends of the extrusion screw, and the extrusion screw is convenient to use. The rotation stability of the screw rod in the machine barrel is improved, and the sealing effect between the screw rod and the machine barrel is ensured; due to the fact that the thread screwing direction of the first material blocking section is the same as that of the feeding section and the thread pitch of the first material blocking section is smaller than that of the feeding section, the battery slurry can be pushed forwards when the first material blocking section rotates, the thread pitch of the first material blocking section is small, the resistance of the battery slurry flowing back to the transmission side is large, and the battery slurry is prevented from flowing back to the transmission side. The supporting bearing can prevent slurry from flowing into the transmission side; the second material blocking section and the feeding section are opposite in thread rotation direction, battery slurry can be pushed reversely during rotation, the slurry is prevented from flowing into the supporting bearing on the discharging side, and therefore the sealing effect between the screw and the machine barrel is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery slurry preparation, and in particular to an extrusion screw and an extruder for preparing battery slurry. Background Art

[0002] In the production process of lithium batteries, the uniformity of slurry mixing directly affects the safety performance and electrochemical performance of the battery. If the slurry is not evenly dispersed, it will cause fluctuations in the coating amount during the coating process, and uneven dispersion of the conductive agent on the pole piece during the drying process, which will affect the capacity consistency, internal resistance consistency and voltage consistency of the lithium battery, resulting in a decline in product quality. In severe cases, it will cause abnormalities in the SEI film (solid electrolyte interface film) inside the battery and abnormal lithium deposition on the negative electrode, leading to safety accidents such as battery short circuit, explosion, and combustion.

[0003] In the related art, the screw, extruder and extrusion method with publication number CN114901452A, and the conical four-screw reciprocating pin screw extruder with publication number CN1644352A, all adopt the method of installing pins on the barrel and cooperating with the annular groove on the screw to shear the mixed materials between the screw and the barrel to improve the mixing and dispersion effect of the materials, thereby improving the quality of the materials. However, the discharging method of the above structures all adopts the front discharging method, and the screw is installed in the barrel as a cantilever structure. When rotating in the barrel, it is easily affected by gravity and oscillates radially, which affects the service life of the transmission side support bearing and the sealing effect between the screw and the barrel.

[0004] Therefore, it is necessary to study and improve the above structure and provide an extrusion screw and an extruder for preparing battery slurry, in order to achieve a more practical purpose. Summary of the invention

[0005] The embodiments of the present application provide an extrusion screw and an extruder for preparing battery slurry, so as to solve the problem of how to improve the rotation stability and sealing of the screw in the barrel of the extrusion equipment in the related art.

[0006] In a first aspect, an embodiment of the present application provides an extrusion screw for preparing battery slurry, comprising:

[0007] A first material-blocking section, a feeding section and a second material-blocking section are sequentially arranged along the axis direction of the extrusion screw, wherein the thread rotation directions of the first material-blocking section and the feeding section are the same, and the thread pitch of the first material-blocking section is smaller than the thread pitch of the feeding section, and the thread rotation directions of the second material-blocking section and the feeding section are opposite.

[0008] In the first aspect, in some embodiments, the feeding section includes a guiding section close to the first material blocking section and a dispersing section close to the second material blocking section, and the dispersing section is provided with annular grooves arranged at intervals along the axial direction.

[0009] In the first aspect, in some embodiments, the thread lead of the guide segment is greater than the thread lead of the dispersion segment.

[0010] In the first aspect, in some embodiments, the first material resistance section, the feeding section and the second material resistance section are all hollow structures with openings at both ends, and the first material resistance section, the feeding section and the second material resistance section are connected together by a shaft.

[0011] In the first aspect, in some embodiments, a limiting protrusion and a limiting sleeve are provided on the shaft rod, and the limiting protrusion and the limiting sleeve are used to axially position the first material blocking section, the feeding section and the second material blocking section on the shaft rod.

[0012] In the first aspect, in some embodiments, the cross-section of the mating portion of the shaft rod and the first material-blocking section, the feeding section, and the second material-blocking section is a non-circular surface.

[0013] In the first aspect, in some embodiments, a heat exchange cavity extending axially and used for passing cooling water is provided in the shaft.

[0014] In a second aspect, the second aspect of the embodiment of the present application provides an extruder for preparing battery slurry, comprising:

[0015] A barrel, wherein the extrusion screw for preparing battery slurry as described above is arranged in the barrel, both ends of the extrusion screw are sealed and rotatably connected to the barrel, and a feed port and a discharge port are arranged on the side of the barrel.

[0016] In a second aspect, in some embodiments, the barrel is provided with a pin extending into the annular groove along the circumferential direction;

[0017] The barrel is circumferentially provided with cooling grooves for introducing cooling water, and guide holes communicating with adjacent cooling grooves.

[0018] On the second aspect, in some embodiments, it also includes a machine platform for supporting the barrel, and a driving structure for driving the extrusion screw to rotate, the driving structure includes a motor and a reducer arranged on the machine platform, and the motor is connected to the extrusion screw through the reducer.

[0019] The beneficial effects of the technical solution provided by this application include:

[0020] The embodiment of the present application provides an extrusion screw and an extruder for preparing battery slurry. Since a first material blocking section, a feeding section, and a second material blocking section are sequentially arranged along the axis direction of the extrusion screw, support bearings and sealing structures can be installed at both ends of the extrusion screw. At the same time, the barrel adopts a side discharge method to match the structure of the extrusion screw. Compared with the cantilever structure of the screw with front discharge, the radial swing of the screw in the barrel can be reduced, the rotational stability of the screw in the barrel can be improved, and the sealing effect between the screw and the barrel can be ensured.

[0021] At the same time, since the threads of the first material resistance section and the feeding section have the same rotation direction and the thread pitch of the first material resistance section is smaller than that of the feeding section, the first material resistance section can also push the battery slurry forward when rotating. At the same time, the threads of the first material resistance section are set with a small pitch, and the resistance of the battery slurry to flow back to the transmission side is large, thereby preventing the slurry from flowing into the support bearing on the transmission side. In addition, the threads of the second material resistance section and the feeding section have opposite rotation directions. Therefore, the second material resistance section can push the battery slurry in the opposite direction when rotating to prevent the slurry from flowing into the support bearing on the discharge side, thereby improving the sealing effect between the screw and the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure of an extrusion screw provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of the dispersion section provided in the embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of an extruder provided in an embodiment of the present application;

[0026] Figure 4 A top view of a cross-sectional view of a barrel provided in an embodiment of the present application;

[0027] Figure 5 A front cross-sectional view of a barrel provided in an embodiment of the present application;

[0028] Figure 6 A side cross-sectional view of a pin provided in an embodiment of the present application;

[0029] Figure 7 A side cross-sectional view of a cooling slot provided in an embodiment of the present application.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. First material blocking section; 2. Feeding section; 21. Material guiding section; 22. Dispersing section; 221. Annular groove; 3. Second material blocking section; 4. Shaft; 41. Limiting protrusion; 42. Limiting sleeve; 43. Heat exchange chamber; 5. Cylinder; 51. Feed inlet; 52. Discharge outlet; 53. Pin; 54. Cooling trough; 55. Guide hole; 56. Cover plate; 6. Machine table; 7. Motor; 8. Reducer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The embodiments of the present application provide an extrusion screw and an extruder for preparing battery slurry, which can solve the problem of how to improve the rotation stability and sealing of the screw in the barrel of the extrusion equipment in the related art.

[0034] See also Figures 1 to 5 As shown, the first aspect of the embodiment of the present application provides an extrusion screw for preparing battery slurry, comprising:

[0035] The first material blocking section 1, the feeding section 2 and the second material blocking section 3 are arranged in sequence along the axial direction of the extrusion screw. The thread rotation directions of the first material blocking section 1 and the feeding section 2 are the same, and the thread pitch of the first material blocking section 1 is smaller than the thread pitch of the feeding section 2. The thread rotation directions of the second material blocking section 3 and the feeding section 2 are opposite.

[0036] The extrusion screw for preparing battery slurry in the embodiment of the present application is provided with a first material blocking section 1, a feeding section 2 and a second material blocking section 3 in sequence along its axial direction. Therefore, support bearings and sealing structures can be installed at both ends of the extrusion screw. At the same time, the barrel 5 needs to adopt a side discharge method to match the structure of the extrusion screw. Compared with the screw cantilever structure of the front discharge, the radial swing of the screw in the barrel 5 can be reduced, the rotational stability of the screw in the barrel 5 can be improved, and the sealing effect between the screw and the barrel 5 can be ensured;

[0037] At the same time, since the threads of the first material resistance section 1 and the feeding section 2 rotate in the same direction, and the thread pitch of the first material resistance section 1 is smaller than the thread pitch of the feeding section 2, the first material resistance section 1 can also generate a forward propulsion force on the battery slurry when rotating. At the same time, the threads of the first material resistance section 1 are set with a small pitch. For example, in this example, the first material resistance section 1 adopts a fine pitch thread with a small thread pitch, and the resistance of the battery slurry to the backflow to the transmission side is large, thereby preventing the slurry from flowing into the support bearing on the transmission side.

[0038] In addition, the second material-blocking section 3 and the feeding section 2 have opposite thread rotation directions. Therefore, the second material-blocking section 3 can push the battery slurry in the opposite direction when rotating, that is, it can generate a backward driving force on the battery slurry to prevent the slurry from flowing into the support bearing on the discharge side, so that the battery slurry can flow out stably from the discharge port 52 on the side of the barrel 5. The extrusion screw in this example adopts side discharge, and support bearings can be installed at both ends of the extrusion screw. The rotation stability of the extrusion screw in the barrel 5 is good. At the same time, the setting of the first material-blocking section 1 and the second material-blocking section 3 improves the sealing effect between the screw and the barrel 5.

[0039] In some alternative embodiments: See Figures 1 to 5 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, wherein the feeding section 2 of the extrusion screw for preparing battery slurry includes a guide section 21 close to the first material blocking section 1 and a dispersion section 22 close to the second material blocking section 3, and the dispersion section 22 is provided with annular grooves 221 arranged at intervals along the axial direction.

[0040] The feeding section 2 of the embodiment of the present application includes a guide section 21 close to the first material blocking section 1 and a dispersion section 22 close to the second material blocking section 3. When the thread of the guide section 21 rotates in the barrel 5, the battery slurry can be quickly pushed to the discharge side. The thread of the dispersion section 22 is provided with axially spaced annular grooves 221, which can cooperate with the pins 53 installed on the barrel 5.

[0041] In use, the pin 53 installed on the barrel 5 extends into the annular groove 221 and is arranged circumferentially along the annular groove 221. When the thread of the dispersion section 22 rotates to guide the material in the barrel 5, it cooperates with the stationary pin 53 to increase the number of shearing times of the battery slurry and improve the dispersion efficiency, that is, the battery slurry mixed between the extrusion screw and the barrel 5 is sheared to improve the mixing and dispersion effect of the battery slurry, thereby improving the quality of the battery slurry.

[0042] In this example, the thread of the dispersion section 22 adopts a double-start thread, and the annular groove 221 at the contact position with the pin 53 is processed by turning. The shear fitting area between the pin 53 and the thread of the dispersion section 22 is larger than the shear fitting area of ​​the single thread used in the solution mentioned in the related technology. In actual use, the extrusion screw has a better shear dispersion effect on the battery slurry.

[0043] In some alternative embodiments: See Figures 1 to 5 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, wherein the thread lead of the guide section 21 of the extrusion screw for preparing battery slurry is greater than the thread lead of the dispersion section 22 .

[0044] In the embodiment of the present application, the thread lead of the material guide section 21 is greater than the thread lead of the dispersion section 22, that is, the thread pitch of the material guide section 21 is greater than the thread pitch of the dispersion section 22. The thread pitch of the material guide section 21 is large, and the material passing cross-section formed with the barrel 5 is large, so that the material passing resistance becomes relatively small, and the cavity pressure of the material guide section 21 can be dispersed to ensure the feeding efficiency of the battery slurry. Exemplarily, in this example, the thread lead of the material guide section 21 is between 1.5 and 2 times the thread lead of the dispersion section 22.

[0045] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, wherein the first material blocking section 1, the feeding section 2 and the second material blocking section 3 of the extrusion screw for preparing battery slurry are all hollow structures with openings at both ends, and the first material blocking section 1, the feeding section 2 and the second material blocking section 3 are connected together by an axis rod 4.

[0046] The first material resistance section 1, the feeding section 2, and the second material resistance section 3 of the embodiment of the present application are all hollow structures with openings at both ends, so they can be installed on the shaft rod 4 in a sleeve manner, which is convenient for disassembly and installation. In this example, the first material resistance section 1, the feeding section 2, and the second material resistance section 3 can all be processed independently. Since the feeding section 2 is relatively long, it is installed by segmented processing and then axially sleeved on the shaft rod 4 in sequence.

[0047] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, and a limiting protrusion 41 and a limiting sleeve 42 are provided on the shaft 4 of the extrusion screw for preparing battery slurry, and the limiting protrusion 41 and the limiting sleeve 42 are used to axially position the first material blocking section 1, the feeding section 2 and the second material blocking section 3 on the shaft 4.

[0048] A limiting protrusion 41 and a limiting sleeve 42 are provided on the shaft rod 4 of the embodiment of the present application. During specific installation, the first material resistance section 1, the feeding section 2 and the second material resistance section 3 are sequentially put onto the shaft rod 4, and then the limiting sleeve 42 is installed, so that the first material resistance section 1 abuts against the limiting protrusion 41, and the second material resistance section 3 abuts against the limiting sleeve 42, and at the same time, the two ends of the feeding section 2 abut against the first material resistance section 1 and the second material resistance section 3 respectively, thereby axially positioning the first material resistance section 1, the feeding section 2 and the second material resistance section 3 on the shaft rod 4.

[0049] Exemplarily, in this example, the limiting protrusion 41 is a stepped sleeve axially welded to the shaft rod 4, and the limiting sleeve 42 is a threaded sleeve that can be detachably connected to the shaft rod 4 by means of threads.

[0050] In some alternative embodiments: See Figure 1 and Figure 6 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, wherein the cross-section of the shaft 4 of the extrusion screw for preparing battery slurry and the mating parts of the first material blocking section 1, the feeding section 2, and the second material blocking section 3 are non-circular surfaces.

[0051] The cross-section of the mating parts of the shaft rod 4 and the first material resistance segment 1, the feeding segment 2, and the second material resistance segment 3 in the embodiment of the present application is a non-circular surface. Therefore, after the first material resistance segment 1, the feeding segment 2, and the second material resistance segment 3 are installed on the shaft rod 4, the shaft rod 4 and the first material resistance segment 1, the feeding segment 2, and the second material resistance segment 3 can be prevented from relative rotation, thereby ensuring that the shaft rod 4 can stably drive the first material resistance segment 1, the feeding segment 2, and the second material resistance segment 3 to rotate.

[0052] Exemplarily, in this example, the cross-section of the matching portion of the shaft rod 4 and the first material blocking section 1, the feeding section 2, and the second material blocking section 3 is a regular hexagon.

[0053] In some alternative embodiments: See Figure 4 and Figure 5 As shown, an embodiment of the present application provides an extrusion screw for preparing battery slurry, wherein a heat exchange cavity 43 extending axially and used for passing cooling water is disposed in the shaft 4 of the extrusion screw for preparing battery slurry.

[0054] An axially extending heat exchange chamber 43 is provided in the shaft rod 4 of the embodiment of the present application, and cooling water can be introduced into the heat exchange chamber 43 for heat exchange. By way of example, in this example, the heat exchange chamber 43 is opened from one end of the shaft rod 4 close to the discharge side, and cooling water can be introduced into the open end through a rotary joint to exchange heat with the battery slurry in the barrel 5 to keep the temperature of the battery slurry stable.

[0055] See also Figures 1 to 7 As shown, the second aspect of the embodiment of the present application provides an extruder for preparing battery slurry, comprising:

[0056] The barrel 5 is provided with an extrusion screw for preparing battery slurry according to any of the above embodiments, both ends of the extrusion screw are sealed and rotatably connected to the barrel 5 , and a feed port 51 and a discharge port 52 are provided on the side of the barrel 5 .

[0057] The barrel 5 of the extruder for preparing battery slurry in the embodiment of the present application is equipped with an extrusion screw of any of the above-mentioned embodiments, and support bearings and a rotary sealing structure are installed between both ends of the extrusion screw and the barrel 5 to ensure that both ends of the extrusion screw are sealed and rotatably connected to the barrel 5. At the same time, the barrel 5 adopts a side discharge method to cooperate with the structure of the extrusion screw.

[0058] Specifically, the side of the barrel 5 is provided with a feed port 51 and a discharge port 52, both of which are located on the side of the feeding section 2, the feed port 51 is arranged close to the first material blocking section 1, and the discharge port 52 is arranged close to the second material blocking section 3. The extruder of the present application can be combined with a traditional mixer. After the slurry is kneaded in the mixer, the slurry is pumped into the extruder of the present application from the feed port 51 for dispersion. Compared with the screw cantilever structure of the front discharge, the radial swing of the screw in the barrel 5 can be reduced, the rotational stability of the screw in the barrel 5 can be improved, and the sealing effect between the screw and the barrel 5 can be ensured.

[0059] At the same time, since the threads of the first material resistance section 1 and the feeding section 2 rotate in the same direction, and the thread pitch of the first material resistance section 1 is smaller than the thread pitch of the feeding section 2, the first material resistance section 1 can also generate a forward propulsion force on the battery slurry when rotating. At the same time, the threads of the first material resistance section 1 are set with a small pitch. For example, in this example, the first material resistance section 1 adopts a fine pitch thread with a small thread pitch, and the resistance of the battery slurry to the backflow to the transmission side is large, thereby preventing the slurry from flowing into the support bearing on the transmission side.

[0060] In addition, the second material-blocking section 3 and the feeding section 2 have opposite thread rotation directions. Therefore, the second material-blocking section 3 can push the battery slurry in the opposite direction when rotating, that is, it can generate a backward driving force on the battery slurry to prevent the slurry from flowing into the support bearing on the discharge side, so that the battery slurry can flow out stably from the discharge port 52 on the side of the barrel 5. The extrusion screw in this example adopts side discharge, and support bearings can be installed at both ends of the extrusion screw. The rotation stability of the extrusion screw in the barrel 5 is good. At the same time, the setting of the first material-blocking section 1 and the second material-blocking section 3 improves the sealing effect between the screw and the barrel 5.

[0061] In some alternative embodiments: See Figures 1 to 7 As shown, the embodiment of the present application provides an extruder for preparing battery slurry, and the barrel 5 of the extruder for preparing battery slurry is provided with a pin 53 extending into the annular groove 221 along the circumferential direction;

[0062] The barrel 5 is provided with cooling grooves 54 for introducing cooling water and guide holes 55 connecting adjacent cooling grooves 54 along the circumferential direction.

[0063] The barrel 5 of the embodiment of the present application is circumferentially provided with a pin 53 extending into the annular groove 221. When the pin 53 installed on the barrel 5 extends into the annular groove 221 and is arranged circumferentially along the annular groove 221, the thread of the dispersion section 22 rotates and guides the material in the barrel 5, and cooperates with the stationary pin 53 to increase the number of shearing times of the battery slurry and improve the dispersion efficiency, that is, the battery slurry mixed between the extrusion screw and the barrel 5 is sheared to improve the mixing and dispersion effect of the battery slurry, thereby improving the quality of the battery slurry.

[0064] In addition, the barrel 5 is provided with cooling grooves 54 for introducing cooling water and guide holes 55 for connecting adjacent cooling grooves 54 along the circumferential direction. The cooling grooves 54 and the guide holes 55 cooperate to introduce cooling water for heat exchange with the battery slurry in the barrel 5 to keep the temperature of the battery slurry stable. The cooling grooves 54 and the pins 53 are arranged at intervals along the circumferential direction of the barrel 5, and the guide holes 55 and the pins 53 are arranged at intervals along the axial direction of the barrel 5 to avoid interference.

[0065] For example, in this example, the cross-sectional outer contour of a section of the barrel 5 where the pin 53 and the cooling groove 54 are arranged is a regular octagon, which is convenient for installing the pin 53 and setting the cooling groove 54. The pin 53 is threadedly connected to the barrel 5, and a sealing gasket is arranged at the connection to ensure sealing. The cooling groove 54 is opened from the surface of the barrel 5, and the cover plate 56 is fixed with bolts to seal its opening, and a water guide joint can be arranged on the cover plate 56.

[0066] In some alternative embodiments: See Figures 3 to 5 As shown, an embodiment of the present application provides an extruder for preparing battery slurry, which also includes a machine table 6 for supporting a barrel 5, and a driving structure for driving an extrusion screw to rotate, wherein the driving structure includes a motor 7 and a reducer 8 arranged on the machine table 6, and the motor 7 is connected to the extrusion screw through the reducer 8.

[0067] The barrel 5 and the driving structure of the embodiment of the present application are installed on the machine table 6, and the driving structure includes a motor 7 and a reducer 8. The motor 7 drives the extrusion screw to rotate through the reducer 8. Exemplarily, in this example, the motor 7 and the reducer 8 are fixed on the machine table 6, and the barrel 5 is spliced ​​and installed in sections. The barrel 5 has a supporting section fixedly connected to the machine table 6, and the rear end of the barrel 5 is fixedly connected to the end face of the reducer 8. The output end of the reducer 8 extends into the barrel 5 and is connected to the shaft 4 through a coupling, thereby stably supporting the overall structure of the barrel 5.

[0068] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0069] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0070] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An extrusion screw for preparing battery slurry, characterized in that: include: A first material blocking section (1), a feeding section (2) and a second material blocking section (3) are arranged in sequence along the axis direction of the extrusion screw, wherein the thread rotation directions of the first material blocking section (1) and the feeding section (2) are the same, and the thread pitch of the first material blocking section (1) is smaller than the thread pitch of the feeding section (2), and the thread rotation directions of the second material blocking section (3) and the feeding section (2) are opposite.

2. The extrusion screw for preparing battery slurry according to claim 1, characterized in that: The feeding section (2) comprises a material guiding section (21) close to the first material blocking section (1) and a dispersion section (22) close to the second material blocking section (3), and the dispersion section (22) is provided with annular grooves (221) arranged at intervals along the axial direction.

3. The extrusion screw for preparing battery slurry according to claim 2, characterized in that: The thread lead of the material guiding section (21) is greater than the thread lead of the dispersing section (22).

4. The extrusion screw for preparing battery slurry according to claim 1, characterized in that: The first material blocking section (1), the feeding section (2) and the second material blocking section (3) are all hollow structures with openings at both ends; the first material blocking section (1), the feeding section (2) and the second material blocking section (3) are connected together via a shaft (4).

5. The extrusion screw for preparing battery slurry according to claim 4, characterized in that: A limiting protrusion (41) and a limiting sleeve (42) are provided on the shaft rod (4), and the limiting protrusion (41) and the limiting sleeve (42) are used to axially position the first material blocking section (1), the feeding section (2) and the second material blocking section (3) on the shaft rod (4).

6. The extrusion screw for preparing battery slurry according to claim 4, characterized in that: The cross section of the matching portion of the shaft rod (4) and the first material blocking section (1), the feeding section (2) and the second material blocking section (3) is a non-circular surface.

7. The extrusion screw for preparing battery slurry according to claim 4, characterized in that: The shaft (4) is provided with an axially extending heat exchange cavity (43) for passing cooling water.

8. An extruder for preparing battery slurry, characterized in that: include: A barrel (5), wherein an extrusion screw for preparing battery slurry according to any one of claims 1 to 7 is arranged inside the barrel (5), both ends of the extrusion screw are sealed and rotatably connected to the barrel (5), and a feed port (51) and a discharge port (52) are arranged on the side of the barrel (5).

9. The extruder for preparing battery slurry according to claim 8, characterized in that: The barrel (5) is provided with a pin (53) along the circumferential direction and extends into the annular groove (221); The barrel (5) is provided with cooling grooves (54) for introducing cooling water along the circumferential direction, as well as guide holes (55) communicating with adjacent cooling grooves (54).

10. The extruder for preparing battery slurry according to claim 8, characterized in that: It also includes a machine platform (6) for supporting the barrel (5), and a driving structure for driving the extrusion screw to rotate, wherein the driving structure includes a motor (7) and a reducer (8) arranged on the machine platform (6), and the motor (7) is connected to the extrusion screw through the reducer (8).

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