Stirring assembly and stirring device

Abstract

The stirring assembly comprises a helical ribbon paddle and an axial flow propeller, the helical ribbon paddle comprises a helical ribbon paddle blade and a rotating shaft, and the helical ribbon paddle blade is fixed to the rotating shaft and used for stirring slurry; the axial-flow propeller comprises axial-flow propeller blades and a driving shaft, the axial-flow propeller blades are arranged between the helical ribbon blades and the rotating shaft and connected with the driving shaft, the axial-flow propeller blades are provided with a plurality of inclined blades, the inclined blades are sequentially arranged in the circumferential direction of the axial-flow propeller blades at intervals, and the inclined blades are used for driving slurry to axially circulate. The stirring assembly is arranged on the base, so that the stirring assembly can realize kneading operation on slurry when working, the mixing uniformity of the slurry stirred by the stirring assembly can be greatly improved, the rolling stripping force data of the slurry can be improved, the slurry can be subsequently applied to a lithium battery electrode, the bonding force after the slurry and a current collector are compounded can be improved, and the service life of the lithium battery electrode can be prolonged. Therefore, the problem of material falling during disassembly of the battery cell can be solved, so that the safety and the electrical performance of the lithium battery can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field related to the preparation of slurry in lithium battery electrodes, and particularly relates to a stirring assembly and a stirring device. Background Art

[0002] In the manufacturing process of lithium batteries, the first process of lithium battery electrodes is the slurry preparation process, and the consistency of the slurry determines the performance of the lithium battery. At present, the main slurry preparation equipment on the market is PD double planetary mixers, circulating slurry preparation machines, and twin-screw slurry preparation machines. Among them, for the negative electrode circulating slurry preparation machine, SBR (styrene-butadiene rubber) needs to be added to improve the adhesion force between the slurry and the current collector (copper foil). SBR is an oily glue-like substance and needs to be fully mixed with the graphite slurry to adhere to the current collector more evenly.

[0003] At present, the stirring and dispersing units adopted by the circulating slurry preparation machine and the PD double planetary mixer are both serrated dispersing disks for dispersion and ribbon paddles for stirring. The stirring and mixing ability is insufficient, resulting in a low roll pressing peel force for the prepared slurry. This will greatly increase the risk of the core disassembling and dropping materials, and have an adverse impact on the battery safety and electrical performance. Summary of the Utility Model

[0004] In view of this, it is necessary to provide a stirring assembly and a stirring device for solving the above technical problems.

[0005] A stirring assembly is applied to a circulating slurry preparation process device. The stirring assembly includes:

[0006] A ribbon paddle, including ribbon paddle blades and a rotating shaft. The ribbon paddle blades are fixed to the rotating shaft and are used for stirring the slurry.

[0007] An axial flow propeller, including axial flow propeller blades and a drive shaft. The axial flow propeller blades are arranged between the ribbon paddle blades and the rotating shaft and are connected to the drive shaft. The axial flow propeller blades have a plurality of inclined blades, and the plurality of inclined blades are arranged at intervals in the circumferential direction of the axial flow propeller blades. Moreover, the inclined blades are used to drive the axial circulation of the slurry.

[0008] It can be understood that during the process of the ribbon paddle blades stirring the slurry on the ribbon paddle, the inclined blades on the axial flow propeller are used to drive the axial circulation of the slurry to achieve the kneading operation of the slurry. In this way, the mixing uniformity of the slurry after being stirred by this stirring assembly can be greatly improved, and the data of the roll pressing peel force of the slurry can be increased. When the slurry is subsequently applied to lithium battery electrodes, the adhesion force after the slurry is combined with the current collector can be improved, thus solving the problem of the core disassembling and dropping materials, and ensuring the safety and electrical performance of the lithium battery.

[0009] In one embodiment, the number of the axial flow propulsion blades is configured to be multiple, and along the axial direction of the drive shaft, the multiple axial flow propulsion blades are arranged at intervals in sequence.

[0010] It can be understood that using multiple axial flow propulsion blades to perform the kneading operation on the slurry can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly.

[0011] In one embodiment, an inclined paddle is arranged on the rotating shaft, the inclined paddle is arranged between the spiral ribbon blade and the rotating shaft, and the inclined paddle can rotate driven by the rotating shaft for driving the slurry to circulate axially.

[0012] It can be understood that while the spiral ribbon blade stirs the slurry, the inclined paddle can drive the slurry to circulate axially, which can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly.

[0013] In one embodiment, the projection of the inclined paddle blade in the radial direction of the rotating shaft towards the rotating shaft is at different positions in the axial direction of the rotating shaft where the inclined paddle is arranged.

[0014] It can be understood that through the above structural arrangement, the inclined paddle blades on the axial flow propulsion blades can avoid each other with the inclined paddle, preventing position interference between the two during rotation, which can make the arrangement between the axial flow propulsion paddle and the spiral ribbon paddle more compact and has the effect of reducing the overall volume of the stirring assembly.

[0015] In one embodiment, the inclined paddle is arranged corresponding to the axial flow propulsion blade, and the inclined paddle is arranged at an upper position in the axial direction of the rotating shaft of the corresponding axial flow propulsion blade.

[0016] In one embodiment, the stirring assembly further includes a baffle, and the baffle is arranged between the spiral ribbon blade and the rotating shaft.

[0017] It can be understood that using the baffle to block the flow of part of the slurry to form disordered eddies can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly.

[0018] In one embodiment, in the radial direction of the rotating shaft, the baffle and the drive shaft are arranged on both sides of the rotating shaft.

[0019] It can be understood that arranging the baffle and the drive shaft on both sides of the rotating shaft in the radial direction can play a role in avoiding the baffle and the axial flow propulsion blades on the drive shaft, preventing position interference between the axial flow propulsion blades and the baffle during rotation.

[0020] In one embodiment, an inclined paddle is provided on the rotating shaft. The inclined paddle is disposed between the spiral blade and the rotating shaft, and the inclined paddle can rotate driven by the rotating shaft to drive the axial circulation of the slurry.

[0021] Wherein, the stirring assembly further includes a baffle, and at least a part of the baffle is disposed between the spiral blade and the rotating shaft.

[0022] It can be understood that through the above structural arrangement, the mixing uniformity of the slurry after being stirred by the stirring assembly can be further improved.

[0023] In one embodiment, a notch is formed on the baffle. The notch is correspondingly arranged with the inclined paddle, and a part of the inclined paddle extends into the corresponding notch.

[0024] It can be understood that the notch on the baffle is used to accommodate part of the inclined paddle, thereby realizing the avoidance of the baffle for the inclined paddle, enabling the baffle to be arranged close to the inclined paddle and preventing the baffle from colliding with the inclined paddle.

[0025] The present application also claims protection for a stirring device including the above-mentioned stirring assembly.

[0026] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0027] For the stirring assembly and the stirring device claimed in the present application, during the process of stirring the slurry by the spiral blade on the spiral ribbon paddle, the inclined paddle on the axial flow propelling paddle is used to drive the axial circulation of the slurry to realize the kneading operation of the slurry. In this way, the mixing uniformity of the slurry after being stirred by the stirring assembly can be greatly improved, and the data of the roll pressing peeling force of the slurry can be increased. When the slurry is subsequently applied to the lithium battery electrode, the adhesion force after the slurry is compounded with the current collector can be improved, thus solving the problem of material dropping during the disassembly of the battery cell, and ensuring the safety and electrical performance of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of the stirring assembly provided by an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram for comparing the peeling test of the stirring assembly of the present application with the traditional serrated dispersion disc.

[0031] Reference numerals: 100, stirring assembly; 10, helical ribbon impeller; 11, helical ribbon blade; 12, rotating shaft; 13, pitched blade; 131, blade; 20, axial flow propeller; 21, axial flow propeller blade; 211, pitched blade; 22, drive shaft; 30, baffle; 31, notch. Detailed implementation manners

[0032] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] It should be noted that when an element is referred to as being "provided on" another element, it can be directly provided on the other element or there may also be an intermediate element. When an element is considered to be "provided on" another element, it can be directly provided on the other element or there may be an intermediate element at the same time. When an element is considered to be "fixed to" another element, it can be directly fixed to the other element or there may be an intermediate element at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] The stirring assembly 100 claimed in this application is applied to the circulating pulping process equipment. Specifically, the stirring assembly 100 can be applied to the stirring device of the circulating pulping process equipment. Here, the circulating pulping process equipment is used to prepare the slurry for the lithium battery electrode, and the stirring device can specifically be the dispersion tank or the finished product tank of the circulating pulping process equipment.

[0036] As Figure 1As shown, the stirring assembly 100 provided by an embodiment of the present application includes a helical ribbon impeller 10 and an axial flow propeller 20. The helical ribbon impeller 10 includes helical ribbon blades 11 and a rotating shaft 12. The helical ribbon blades 11 are fixed to the rotating shaft 12 and are used for stirring the slurry. The axial flow propeller 20 includes axial flow propeller blades 21 and a drive shaft 22. The axial flow propeller blades 21 are arranged between the helical ribbon blades 11 and the rotating shaft 12 and are connected to the drive shaft 22. The axial flow propeller blades 21 have a plurality of inclined blades 211. The plurality of inclined blades 211 are arranged at intervals in sequence along the circumferential direction of the axial flow propeller blades 21. Moreover, the inclined blades 211 are used to drive the slurry to circulate axially. That is to say, during the process of stirring the slurry with the helical ribbon blades 11 on the helical ribbon impeller 10, the inclined blades 211 on the axial flow propeller 20 are used to drive the slurry to circulate axially to achieve the kneading operation of the slurry. In this way, the mixing uniformity of the slurry after being stirred by the stirring assembly 100 can be greatly improved, and the data of the roll pressing peeling force of the slurry can be increased, so that when the slurry is subsequently applied to the lithium battery electrode, the adhesion force after the slurry is compounded with the current collector can be improved, which can solve the problem of the core disassembling and dropping materials, thereby ensuring the safety and electrical performance of the lithium battery. Here, the current collector specifically refers to the copper foil of the lithium battery electrode. It should be noted that since the axial flow propeller blades 21 are arranged between the helical ribbon blades 11 and the rotating shaft 12, the setting of the axial flow propeller 20 does not increase the overall size of the stirring assembly 100.

[0037] It should be noted that during the rotation of the axial flow propeller 20 driving the inclined blades 211, due to the structural setting of the inclined blades 211, the inclined blades 211 can push the slurry obliquely downward, so as to drive the slurry to circulate axially and finally achieve the kneading operation of the slurry to make the slurry fully mixed. Here, the number of the inclined blades 211 in the axial flow propeller blades 21 is configured to be three. Of course, in other embodiments, the number of the inclined blades 211 in the axial flow propeller blades 21 can also be configured to be two, four, or even more. It should be noted that the inclination angle of the inclined blades 211 is between 30° and 45°, and can be specifically set according to the use requirements. Among them, the above-mentioned axial circulation of the slurry specifically refers to the slurry circulation at a certain angle with the circulation direction of the slurry when the helical ribbon blades 11 stir the slurry.

[0038] As shown in Figure 1 the figure, the helical ribbon blades 11 are sleeved on one end of the rotating shaft 12 in the axial direction in a circumferentially limited manner, and the assembly connection between the helical ribbon blades 11 and the rotating shaft 12 is realized. When the stirring assembly 100 works, by driving the rotation of the rotating shaft 12, the driving of the helical ribbon blades 11 to stir the slurry can be realized. It should be noted that the helical ribbon blades 11 on the above-mentioned helical ribbon impeller 10 can adopt the conventional method of the existing helical ribbon impeller, and will not be elaborated here.

[0039] Preferably, as shown in Figure 1As shown in the figure, an inclined paddle 13 is provided on the rotating shaft 12. The inclined paddle 13 is arranged between the spiral ribbon blade 11 and the rotating shaft 12. Moreover, the inclined paddle 13 can rotate driven by the rotating shaft 12 to drive the axial circulation of the slurry. That is to say, when the spiral ribbon paddle 10 stirs the slurry with the spiral ribbon blade 11, the inclined paddle 13 can also drive the axial circulation of the slurry, which can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly 100. Here, the inclined paddle 13 is sleeved on the rotating shaft 12 in a circumferential limiting manner to realize the assembly connection of the inclined paddle 13 on the rotating shaft 12. Each inclined paddle 13 includes two symmetrically arranged blades 131.

[0040] As Figure 1 shown in the figure, the number of the axial flow propulsion blades 21 is configured as multiple. Along the axial direction of the drive shaft 22, the multiple axial flow propulsion blades 21 are sequentially and spacedly fixed to the drive shaft 22. When the stirring assembly 100 works, the kneading of the axial flow propulsion blades 21 on the slurry can be realized by driving the rotation of the drive shaft 22. Moreover, the stirring assembly 100 of the present application uses multiple axial flow propulsion blades 21 to realize the kneading operation of the slurry, which can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly 100. Here, the number of the axial flow propulsion blades 21 is configured as two. Of course, in other embodiments, the number of the axial flow propulsion blades 21 can also be configured as one, three, or even more, which will not be elaborated here.

[0041] Preferably, as Figure 1 shown in the figure, the projection of the inclined paddle piece 211 on the axial flow propulsion blade 21 in the radial direction of the rotating shaft 12 towards the rotating shaft 12 is at different positions in the axial direction of the rotating shaft 12 where the inclined paddle 13 is arranged. That is to say, the inclined paddle 13 on the spiral ribbon paddle 10 and the inclined paddle piece 211 on the axial flow propulsion paddle 20 are arranged in a staggered manner, so that the inclined paddle piece 211 and the inclined paddle 13 avoid each other to prevent position interference between the two during rotation. In this way, the axial flow propulsion paddle 20 and the spiral ribbon paddle 10 can be arranged more compactly, which has the effect of reducing the overall volume of the stirring assembly 100. Here, the projection of the inclined paddle piece 211 on the axial flow propulsion blade 21 and the inclined paddle 13 on the spiral ribbon paddle 10 overlap partially in the axial direction of the rotating shaft 12.

[0042] As Figure 1 shown in the figure, the inclined paddle 13 and the axial flow propulsion blade 21 are correspondingly arranged, and the inclined paddle 13 is arranged at the upper position in the axial direction of the rotating shaft 12 corresponding to the axial flow propulsion blade 21. Of course, in other embodiments, the number of the inclined paddles 13 and the number of the axial flow propulsion blades 21 can also be different, and the inclined paddle 13 can also be arranged below the corresponding axial flow propulsion blade 21, which will not be elaborated here.

[0043] As Figure 1As shown, the stirring assembly 100 further includes a baffle 30. The baffle 30 is at least partially inserted between the spiral ribbon blade 11 and the rotating shaft 12, and the flowing part of the slurry can impact the baffle 30. That is to say, the stirring assembly 100 can utilize the blocking of the baffle 30 on the flow of part of the slurry to make the slurry form a disordered vortex, which can further improve the mixing uniformity of the slurry after being stirred by the stirring assembly 100. It should be noted that since the baffle 30 is at least partially inserted between the spiral ribbon blade 11 and the rotating shaft 12, the setting of the baffle 30 will not increase the overall size of the stirring assembly 100.

[0044] Preferably, the baffle 30 is arranged on the side of the rotating shaft 12 on the spiral ribbon 10 away from the axial flow propeller 20. And, in order to avoid the inclined blade 13 on the spiral ribbon 10, a notch 31 can be opened on the baffle 30. The notch 31 is arranged corresponding to the inclined blade 13, and part of the inclined blade 13 can extend into the corresponding notch 31.

[0045] As can be seen from the above, when the stirring assembly 100 of the present application works, the axial flow propeller blades 21 on the axial flow propeller 20 and the inclined blades 13 on the spiral ribbon 10 can be used to drive the slurry to perform axial circulation respectively. During this process, the baffle 30 can block the flow of part of the slurry to make this part of the slurry form a disordered vortex, so as to realize the full stirring of the slurry, greatly improve the mixing uniformity of the slurry after being stirred by the stirring assembly 100, and improve the data of the roll pressing peeling force of the slurry.

[0046] It should be noted that the stirring assembly 100 of the present application is applied to the circulating pulping process equipment. By increasing the axial circulation of the slurry and the liquid mixing and exchange at different positions in the tank, the mixing uniformity of the liquid in the stirring tank can be improved, thereby improving the adhesion force after the slurry prepared by the circulating pulping process equipment is compounded with the current collector. This can solve the pain point of poor adhesion of the negative electrode circulating pulping machine in the industry and solve the quality risk of the core disassembling and curling and dropping materials in the actual production process; moreover, during the preparation of the slurry, the pole piece after the slurry is compounded and dried with the current collector is collected, and the overall SEM view interface of the pole piece is good, and the mixing uniformity and consistency are relatively high.

[0047] Such as Figure 2As shown, in the original process, when the traditional serrated dispersion disc was used in the stirring and dispersing unit of the circulating pulping process equipment, the measured data of the roll pressing and peeling force of the pulp finally prepared by the circulating pulping process equipment was 3.73 N / m. In Solution 1, when only the axial flow propeller 20 was used in the stirring and dispersing unit of the circulating pulping process equipment, the measured data of the roll pressing and peeling force of the pulp finally prepared by the circulating pulping process equipment was 5.22 N / m. In Solution 2, when the axial flow propeller 20 was used in the stirring and dispersing unit of the circulating pulping process equipment and the inclined paddle 13 was arranged on the rotating shaft 12 of the spiral ribbon paddle 10, the measured data of the roll pressing and peeling force of the pulp finally prepared by the circulating pulping process equipment was 5.71 N / m. In Solution 3, when the axial flow propeller 20 was used in the stirring and dispersing unit of the circulating pulping process equipment, the inclined paddle 13 was arranged on the rotating shaft 12 of the spiral ribbon paddle 10, and the baffle 30 was additionally provided, the measured data of the roll pressing and peeling force of the pulp finally prepared by the circulating pulping process equipment was 6.56 N / m. Obviously, through the above data comparison of the roll pressing and peeling force of the pulp, it can be concluded that when the stirring assembly 100 of the present application is applied to the circulating pulping process equipment, it can greatly improve the roll pressing and peeling force of the prepared pulp, which can significantly reduce the quality risk of material dropping during the subsequent application of the pulp to the lithium battery electrode and improve the consistency of the lithium battery product quality. Here, the roll pressing and peeling force of the pulp needs to be greater than or equal to 5 N / m to prevent the risk of material dropping after the pulp is combined with the current collector during the disassembly of the battery cell.

[0048] In addition, the present application also provides a stirring device, including the stirring assembly 100 described above.

[0049] It should be noted that the process flow state of the existing circulating pulping process equipment during the pulp preparation process is: circulating tank - dispersion tank - finished product tank - transfer tank. Specifically, after the powder material is mixed in the high-mixing bin, it needs to be self-circulated in the circulating tank to ensure full contact and mixing of the powder substance and the liquid. This process is similar to the kneading process of traditional double planetary equipment. The high-viscosity pulp after circulation is transferred to the dispersion tank for secondary dispersion and further shearing. Through high-speed shearing, the viscosity and fineness of the pulp are ensured to reach the set viscosity value, which is convenient for uniform coating on the current collector. The dispersed pulp is transferred to the finished product tank for vacuum defoaming and slow stirring process and then transferred to the coating transfer tank for coating transfer. If the stirring assembly 100 of the present application is applied to the finished product tank, the dispersion tank process can be directly omitted, so that the overall process time of the circulating pulping machine in the production process mode can save the process and feeding time in the dispersion tank, and the overall time of the circulating pulping machine during pulping can be compressed from 160 min to within 100 min, and the production efficiency is increased by 37%, which has the effect of greatly improving the pulping production efficiency.

[0050] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification is covered.

[0051] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. As long as appropriate changes and variations made to the above embodiments fall within the scope of the spirit of the present utility model, they fall within the scope of protection required by the present utility model.

Claims

1. A stirring assembly is applied to a circulating pulping process device, characterized in that, The stirring assembly (100) includes: A helical ribbon impeller (10), including helical ribbon blades (11) and a rotating shaft (12), the helical ribbon blades (11) being fixed to the rotating shaft (12) for stirring the slurry; An axial flow propeller (20), including axial flow propeller blades (21) and a drive shaft (22), the axial flow propeller blades (21) being disposed between the helical ribbon blades (11) and the rotating shaft (12) and connected to the drive shaft (22), the axial flow propeller blades (21) having a plurality of inclined blades (211), the plurality of inclined blades (211) being arranged at intervals in sequence along the circumferential direction of the axial flow propeller blades (21), and the inclined blades (211) being used to drive the axial circulation of the slurry.

2. The stirring assembly according to claim 1, wherein The number of the axial flow propeller blades (21) is configured to be plural, and the plural axial flow propeller blades (21) are arranged at intervals in sequence along the axial direction of the drive shaft (22).

3. The stirring assembly according to claim 1, wherein, An inclined blade (13) is provided on the rotating shaft (12), the inclined blade (13) being disposed between the helical ribbon blades (11) and the rotating shaft (12), and the inclined blade (13) being able to rotate driven by the rotating shaft (12) for driving the axial circulation of the slurry.

4. The stirring assembly according to claim 3, characterized in that, The projection of the inclined blade (211) in the radial direction of the rotating shaft (12) onto the rotating shaft (12) is at different positions from the inclined blade (13) in the axial direction of the rotating shaft (12).

5. The stirring assembly according to claim 4, characterized in that, The inclined blade (13) is correspondingly arranged with the axial flow propeller blades (21), and the inclined blade (13) is disposed at an upper position in the axial direction of the rotating shaft (12) corresponding to the axial flow propeller blades (21).

6. The stirring assembly according to claim 1, wherein The stirring assembly (100) further includes a baffle (30), at least a part of the baffle (30) being disposed between the helical ribbon blades (11) and the rotating shaft (12).

7. The stirring assembly according to claim 6, characterized in that, In the radial direction of the rotating shaft (12), the baffle (30) and the drive shaft (22) are disposed on both sides of the rotating shaft (12).

8. The stirring assembly according to claim 1, characterized in that, An inclined blade (13) is provided on the rotating shaft (12), the inclined blade (13) being disposed between the helical ribbon blades (11) and the rotating shaft (12), and the inclined blade (13) being able to rotate driven by the rotating shaft (12) for driving the axial circulation of the slurry; wherein, the stirring assembly (100) further includes a baffle (30), at least a part of the baffle (30) being disposed between the helical ribbon blades (11) and the rotating shaft (12).

9. The stirring assembly according to claim 8, wherein, A notch (31) is formed on the baffle (30), the notch (31) being correspondingly arranged with the inclined blade (13), and the inclined blade (13) partially extends into the corresponding notch (31).

10. A stirring device, characterized in that, Including the stirring assembly (100) according to any one of claims 1 to 9.

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