Battery slurry preparation method and battery

Abstract

This invention provides a method for preparing battery slurry and a battery. The slurry preparation method involves a slurry preparation machine and multiple circulation tanks, which are interconnected by circulation pipelines. The outlet and inlet of the slurry preparation machine are both connected to the circulation pipelines. The slurry preparation method includes: Step S1: Adding powder including binder to the slurry preparation machine and adding solvent to the circulation tanks. The binder powder and solvent circulate between the slurry preparation machine and the circulation tanks to obtain a coarsely mixed binder turbid liquid; Step S2: Feeding the remaining powder into the slurry preparation machine. During the feeding process, the remaining powder and the binder turbid liquid circulate between the slurry preparation machine and the circulation tanks; Step S3: After feeding, the slurry is dispersed and mixed by circulating it among the multiple circulation tanks. During material feeding and dissolution, because the binder has already been dispersed and dissolved, the binder fed at different time points can maintain a basically completely dissolved state, reducing the overall homogenization time.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, specifically to a method for preparing battery slurry and a battery. Background Technology

[0002] In existing technologies, battery slurry production processes include wet slurry preparation and dry slurry preparation. In wet slurry preparation, the binder is first prepared into a gel state in a gelling tank. Then, the binder, solvent, and liquid conductive agent are fed into a circulation tank. The main powder and conductive agent are then mixed in a powder mixer, and the powder and the aforementioned materials are then slurried using a circulating slurry preparation machine. Wet slurry preparation requires additional gelling tanks and gelling solutions, adding extra equipment and slurry preparation time. In dry slurry preparation, the main powder, conductive agent, and binder are mixed together, and then the mixed powder and solvent are continuously slurried together using a slurry preparation machine, thus eliminating the gelling step.

[0003] However, for dry homogenization processes, the amount of powder mixed is relatively large, and the homogenizer supplies powder continuously in batches, resulting in a long powder feeding time (usually more than half an hour). The binder in the process formula itself needs a certain amount of time to dissolve. Because the powder feeding time spans more than half an hour, after the powder is fed, some of the binder in the slurry is almost completely dissolved, while some is only just beginning the dissolution process, which increases the overall homogenization time. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the dry process of battery slurry homogenization in the prior art, which is that the degree of dissolution of binder at different time periods is inconsistent due to the excessive feeding time, which increases the overall homogenization time, thereby providing a method for preparing battery slurry and a battery.

[0005] To address the aforementioned problems, this invention provides a method for preparing battery slurry. The slurry preparation method involves a slurry preparation machine and multiple circulation tanks, which are interconnected via circulation pipelines. The outlet and inlet of the slurry preparation machine are connected to the circulation pipelines via a discharge pipe and a feed pipe, respectively. The slurry preparation method includes: Step S1: Adding powder to the slurry preparation machine and adding solvent to the circulation tanks. The binder powder and solvent circulate between the slurry preparation machine and the circulation tanks to obtain a coarsely mixed binder turbid liquid, wherein the powder includes at least binder; Step S2: Feeding the remaining powder into the slurry preparation machine. During the feeding process, the remaining powder and binder turbid liquid circulate between the slurry preparation machine and the circulation tanks; Step S3: After feeding is completed, the slurry is dispersed and mixed by circulating among the multiple circulation tanks.

[0006] Optionally, in step S1, all the powder is a binder, and the binder and solvent are fed and conveyed uniformly.

[0007] Optionally, in step S2, the binder slurry and the remaining powder are circulated between the pulper and the circulation tank a first preset number of times.

[0008] Optionally, in step S3, a second preset number of cycles are performed between multiple circulation tanks.

[0009] Optionally, step S1 lasts for 2 to 5 minutes, step S2 lasts for 20 to 40 minutes, and step S3 lasts for 30 to 60 minutes.

[0010] Optionally, the remaining powders include the main powder and the conductive agent.

[0011] Optionally, the powder includes a binder, a main powder, and a conductive powder. In step S1, the binder, the main powder, and the conductive powder are coarsely mixed together in a pulping machine.

[0012] Optionally, the ratio of binder, main powder and conductive agent is 1:5:0.5.

[0013] Optionally, the remaining powders include the main powder.

[0014] Optionally, the circulation tank includes a first circulation tank and a second circulation tank. The first circulation tank has a first inlet on its side and a first outlet at its bottom. The second circulation tank has a second inlet on its side and a second outlet at its bottom. The circulation pipeline includes a main pipe, a first branch pipe and a second branch pipe located at a first end of the main pipe, and a third branch pipe and a fourth branch pipe located at a second end of the main pipe. The first branch pipe is connected to the first inlet, the second branch pipe is connected to the second inlet, the third branch pipe is connected to the first outlet, and the fourth branch pipe is connected to the second outlet.

[0015] Optionally, a first dispersing device is provided at the bottom of the first circulation tank, and the inlet of the first dispersing device is connected to the first outlet. A second dispersing device is provided at the bottom of the second circulation tank, and the inlet of the second dispersing device is connected to the second outlet. A third branch pipe is connected to the outlet of the first dispersing device, and a fourth branch pipe is connected to the outlet of the second dispersing device.

[0016] Optionally, a first switch structure is provided on the first branch pipe, a second switch structure is provided on the second branch pipe, a third switch structure is provided on the third branch pipe, and a fourth switch structure is provided on the fourth branch pipe.

[0017] Optionally, a heat exchanger is installed inside the main pipe.

[0018] Optionally, both the top of the first and second circulation tanks are equipped with a stirring mechanism and a dispersing mechanism.

[0019] Optionally, both the first and second dispersing devices include: a housing, with an inlet and an outlet formed on the housing; a dispersing stator fixedly disposed within the housing, having a plurality of first dispersing rings arranged coaxially and having a gradually increasing diameter along the radial direction of the dispersing stator; a dispersing rotor rotatably disposed within the housing, having a plurality of second dispersing rings arranged coaxially and having a gradually increasing diameter along the radial direction of the dispersing rotor, with the first and second dispersing rings staggered and having overlapping portions; and discharge blades fixedly disposed on the dispersing rotor.

[0020] The present invention also provides a battery comprising an electrode, the electrode comprising a metal foil and a slurry coated on the metal foil, the slurry being processed by the slurry preparation method described above.

[0021] The present invention has the following advantages:

[0022] By utilizing the technical solution of this invention, before material feeding, the binder powder and solvent are coarsely mixed in a pulping machine. The binder powder is dispersed in the solvent and uniformly dispersed in the solvent in the form of micro-agglomerates (i.e., forming a binder turbidity), which effectively accelerates the dissolution of the binder. During subsequent material feeding and mixing, since the binder begins to disperse and dissolve first, it continues to dissolve during subsequent feeding and mixing, reducing the overall homogenization time. Therefore, the technical solution of this invention solves the defect in the prior art of dry-process homogenization of battery slurry, where the inconsistent degree of binder dissolution at different time points due to excessive feeding time increases the overall homogenization time. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic flowchart of an embodiment of the battery slurry preparation method according to the present invention is shown;

[0025] Figure 2 It shows Figure 1 A schematic diagram of the pulping process in China;

[0026] Figure 3 It shows Figure 1 A schematic diagram of the circulating tank in the pulping process;

[0027] Figure 4A schematic diagram of the process flow of Embodiment 2 of the battery slurry preparation method according to the present invention is shown. Figure 3 Schematic diagram of the first and second dispersion devices in the middle;

[0028] Figure 5 It shows Figure 1 A schematic diagram of the circulating tank and pulper in the pulping process;

[0029] Figure 6 A schematic diagram of the process of a second embodiment of the battery slurry preparation method according to the present invention is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. First circulating tank; 11. First inlet; 12. First outlet; 20. Second circulating tank; 21. Second inlet; 22. Second outlet; 30. First dispersing device; 40. Second dispersing device; 51. Shell; 52. Dispersing stator; 521. First dispersing ring; 53. Dispersing rotor; 531. Second dispersing ring; 54. Discharge blades; 60. Circulation pipeline; 61. Main pipe; 611. Heat exchanger; 62. First branch pipe; 621 63. First switch structure; 64. Second branch pipe; 65. Second switch structure; 66. Third branch pipe; 67. Third switch structure; 68. Fourth branch pipe; 69. Fourth switch structure; 70. Stirring mechanism; 71. Stirring motor; 72. First rotating shaft; 73. Stirring blade; 80. Dispersion mechanism; 81. Dispersion motor; 82. Second rotating shaft; 83. Shearing blade; 100. Pulping machine; 200. Discharge pipe; 300. Feed pipe. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Example 1

[0037] like Figure 1 and Figure 2 As shown, in Embodiment 1 of the battery slurry preparation method according to this application, the slurry preparation method is carried out by a slurry preparation machine 100 and multiple circulation tanks. The multiple circulation tanks are interconnected by a circulation pipeline 60. The outlet and inlet of the slurry preparation machine 100 are connected to the circulation pipeline 60 through a discharge pipe 200 and a feed pipe 300, respectively. The slurry preparation method includes:

[0038] Step S1: Add the powder into the pulper 100 and the solvent into the circulation tank. The binder and solvent circulate between the pulper 100 and the circulation tank to obtain a coarsely mixed binder turbid liquid.

[0039] Step S2: The remaining powder is fed into the pulping machine. During the feeding process, the remaining powder and binder liquid circulate between the pulping machine 100 and the circulation tank.

[0040] Step S3: After the material is fed, the slurry is circulated and dispersed and mixed between multiple circulation tanks.

[0041] Using the technical solution of this embodiment, before material feeding, the powder containing the binder and the solvent are coarsely mixed in a pulping machine. This disperses the binder powder in the solvent, causing it to disperse evenly in the solvent as micro-agglomerates (i.e., forming a binder turbidity), effectively accelerating binder dissolution. During subsequent material feeding and mixing, since the binder begins to disperse and dissolve first, it continues to dissolve throughout the process, reducing the overall homogenization time. Therefore, the technical solution of this embodiment solves the problem in the prior art battery slurry dry process homogenization where the inconsistent degree of binder dissolution at different time points due to excessive feeding time increases the overall homogenization time.

[0042] Furthermore, in one embodiment, the powder in step S1 is entirely a binder powder.

[0043] In step S1 above, before feeding each material in the formula, the binder is pretreated by feeding the binder powder into the pulper 100 and the solvent into the circulation tank. The solvent enters the pulper 100 through the circulation pipe 60 and the feed pipe 300. The pulper 100 disperses the binder powder in the solvent and evenly disperses it in the solvent in the form of micro-agglomerates (i.e., forming a binder turbid liquid), which can effectively accelerate the dissolution of the binder. After all the binder powder has been fed, the resulting turbid liquid is stored in the circulation tank.

[0044] Step S2, also known as the feeding step, involves the remaining powder being fed into the pulper 100. During the feeding process, the turbid liquid from the circulation tank enters the pulper 100 through the circulation pipe 60 and the feed pipe 300. The turbid liquid and the remaining powder circulate within the pulper 100 and the circulation tank, allowing them to mix and disperse.

[0045] The above-mentioned step S3 is also the mixing step. In step S3, after all the remaining powder materials have been fed, the various materials and binders circulate between multiple circulation tanks to prepare a slurry.

[0046] In steps S1 to S3 above, the binder participates in the dissolution process throughout, and is basically completely dissolved. The dissolution process of the binder is also the process of increasing viscosity. The viscosity of the slurry is at its maximum after the binder is fully dissolved, which also reduces the energy consumption of slurry making.

[0047] The specific structure of the aforementioned circulating tank and pulper 100 will be introduced first below.

[0048] like Figures 3 to 5 As shown, the above-mentioned circulation tank includes a first circulation tank 10 and a second circulation tank 20. The first circulation tank 10 has a first inlet 11 on its side and a first outlet 12 at its bottom. The second circulation tank 20 has a second inlet 21 on its side and a second outlet 22 at its bottom.

[0049] It should be noted that the number of circulating tanks can also be set to more than two.

[0050] It also includes a first dispersing device 30 and a second dispersing device 40. The first dispersing device 30 is disposed at the bottom of the first circulation tank 10, and its inlet is connected to the first outlet 12. The second dispersing device 40 is disposed at the bottom of the second circulation tank 20, and its inlet is connected to the second outlet 22.

[0051] Furthermore, the circulation pipeline 60 includes a main pipe 61, a first branch pipe 62 and a second branch pipe 63 disposed at a first end of the main pipe 61, and a third branch pipe 64 and a fourth branch pipe 65 disposed at a second end of the main pipe 61. The first branch pipe 62 is connected to the first inlet 11, the second branch pipe 63 is connected to the second inlet 21, the third branch pipe 64 is connected to the outlet of the first dispersing device 30, and the fourth branch pipe 65 is connected to the outlet of the second dispersing device 40.

[0052] from Figure 5 As can be seen, the outlet of the pulper 100 is connected to the circulation pipeline 60 via the discharge pipe 200, and the inlet of the pulper 100 is connected to the circulation pipeline via the feed pipe 300. Furthermore, the discharge pipe 200 is connected at the junction of the main pipe 61, the third branch pipe 64, and the fourth branch pipe 65, and this junction can be equipped with a switch structure to control its on / off state. The feed pipe 300 is connected to the third branch pipe 64, and the connection point is located between the outlet of the first dispersing device 30 and the third switch structure 641, and this connection point can also be equipped with a switch structure to control its on / off state.

[0053] like Figure 3 As shown, in this embodiment, the first circulation tank 10 and the second circulation tank 20 are arranged alternately. The material can be circulated in both the first circulation tank 10 and the second circulation tank 20, or it can be circulated in the first circulation tank 10 in a single cycle, or it can be circulated in both cycles in the second circulation tank 20.

[0054] like Figure 3 As shown, a first dispersing device 30 is integrated at the bottom of the first circulation tank 10, and the inlet of the first dispersing device 30 is connected to a first outlet 12 at the bottom of the first circulation tank 10. The first dispersing device 30 can absorb and disperse materials, and the dispersed materials are discharged from the outlet of the first dispersing device 30. A second dispersing device 40 is integrated at the bottom of the second circulation tank 20, and the inlet of the second dispersing device 40 is connected to a second outlet 22 at the bottom of the second circulation tank 20. The second dispersing device 40 can absorb and disperse materials, and the dispersed materials are discharged from the outlet of the first dispersing device 30.

[0055] like Figure 3As shown, the circulation pipeline 60 is used to circulate materials between the first circulation tank 10 and the second circulation tank 20, or to circulate materials within the first circulation tank 10, or to circulate materials within the second circulation tank 20. Specifically, in this example, the main pipe 61 is a vertically extending pipeline, with the first branch pipe 62 and the second branch pipe 63 forming two branches at the upper end of the main pipe 61, and the third branch pipe 64 and the fourth branch pipe 65 forming two branches at the lower end of the main pipe 61. Further, materials in the main pipe 61 can enter the first circulation tank 10 through the first branch pipe 62, materials in the main pipe 61 can enter the second circulation tank 20 through the second branch pipe 63, materials discharged from the first dispersing device 30 can enter the main pipe 61 through the third branch pipe 64, and materials discharged from the second dispersing device 40 can enter the main pipe 61 through the fourth branch pipe 65.

[0056] like Figure 3 As shown, in this embodiment, a heat exchanger 611 is installed inside the main pipe 61. When material passes through the main pipe 61 (with... Figure 3 When the direction shown is from top to bottom or from bottom to top, the material can exchange heat with the heat exchanger 611.

[0057] Based on the above structure, the following combination Figure 3 and Figure 5 The above steps S1 to S3 will be described in further detail.

[0058] In step S1, during the initial feeding process, the binder powder is added to the pulper 100, and the solvent is added to the first circulation tank 10. The solvent in the first circulation tank 10 is pumped to the pulper 100 through the first dispersion device 30, and the powder and liquid solvent are initially dispersed and stirred in the pulper 100, i.e., the first dispersion is performed. The slurry after the first dispersion is pumped to the circulation pipeline 60 through the outlet of the pulper 100, and heat is exchanged through the heat exchanger 611 of the main pipe 61.

[0059] In step S2, during the continuous feeding process, the low solids slurry (a mixture of solvent and a small amount of powder) in the first circulation tank 10 is continuously fed into the pulping machine 100 through the first dispersion device 30, and then dispersed by the pulping machine 100 before being pumped back to the first circulation tank 10. At this time, it undergoes multiple dispersions.

[0060] In step S3, after all the powder materials have been fed, the slurry undergoes a dual circulation process in the first circulation tank 10 and the second circulation tank 20 to mix and disperse the various materials. That is: first circulation tank 10 - first dispersion device 30 - heat exchanger 611 - second circulation tank 20 - second dispersion device 40 - heat exchanger 611 - first circulation tank 10. This process is repeated multiple times to complete the circulation.

[0061] Further, in step S3, the process of dual circulation of material in the first circulation tank 10 and the second circulation tank 20 includes:

[0062] Step S31: The material enters the first circulation tank 10;

[0063] Step S32: After the material is dispersed by the first dispersing device 30, it enters the main pipe 61 through the third branch pipe 64;

[0064] Step S33: The material enters the second circulation tank 20 through the main pipe 61 and the second branch pipe 63;

[0065] Step S34: After the material is dispersed by the second dispersing device 40, it enters the main pipe 61 through the fourth branch pipe 65;

[0066] Step S34: The material enters the first circulation tank 10 through the main pipe 61 and the first branch pipe 62.

[0067] By repeating steps S31 to S35, the material can be circulated in both the first circulation tank 10 and the second circulation tank 20.

[0068] It should be noted that, since the pulper 100 in this embodiment also has a dispersing function, in one implementation, the first dispersing device 30 may not be provided at the bottom of the first circulation tank 10, and the second dispersing device may not be provided at the bottom of the second circulation tank 20. In this case, the third branch pipe 64 can be directly connected to the first outlet 12, and the fourth branch pipe 65 can be directly connected to the second outlet 22. Simultaneously, a rotor pump can be additionally installed on the discharge pipe 200 and the feed pipe 300 to increase the pumping capacity of the slurry.

[0069] In this embodiment, in step S1, the solvent in the first circulation tank 10 is pumped to the pulping machine 100 by a rotary pump, where the pulping machine 100 performs initial dispersion and stirring of the binder and solvent. In step S2, during continuous feeding, the low-solids slurry in the first circulation tank 10 is continuously pumped into the pulping machine 100 by the rotary pump. The pulping machine 100 disperses the slurry and then pumps it back to the first circulation tank 10, performing multiple dispersions. In step S3, the slurry circulates between the first circulation tank 10 and the second circulation tank 20. At this time, the pulping machine participates in the dispersion of the slurry, and the rotary pump provides pumping force for the flow of the slurry. The circulation process of the grout in step S3 is as follows: first circulation tank 10 - heat exchanger 611 - second circulation tank 20 - pulping machine 100 - heat exchanger 611 - first circulation tank 10. This process is repeated multiple times to complete the circulation.

[0070] like Figure 1As shown, in the technical solution of this embodiment, a first switch structure 621 is provided on the first branch pipe 62, a second switch structure 631 is provided on the second branch pipe 63, a third switch structure 641 is provided on the third branch pipe 64, and a fourth switch structure 651 is provided on the fourth branch pipe 65.

[0071] Specifically, the first switch structure 621, the second switch structure 631, the third switch structure 641 and the fourth switch structure 651 can control the flow direction of the material in the circulation pipeline 60, thereby controlling the material to circulate between the first circulation tank 10 and the second circulation tank 20.

[0072] In steps S32 and S33 above, the second switch structure 631 and the third switch structure 641 are turned on, and the first switch structure 621 and the fourth switch structure 651 are turned off. In steps S34 and S35 above, the first switch structure 621 and the fourth switch structure 651 are turned on, and the second switch structure 631 and the third switch structure 641 are turned off.

[0073] Optionally, the first switch structure 621, the second switch structure 631, the third switch structure 641 and the fourth switch structure 651 described above can be solenoid valves, pneumatic valves, etc.

[0074] like Figure 3 As shown in the technical solution of this embodiment, both the top of the first circulation tank 10 and the second circulation tank 20 are provided with a stirring mechanism 70 and a dispersing mechanism 80. The stirring mechanism 70 is used to stir the material, and the dispersing mechanism 80 is used to disperse the material.

[0075] Furthermore, the stirring mechanism 70 on the first circulation tank 10 has the same structure as the stirring mechanism 70 on the second circulation tank 20, and the dispersing mechanism 80 on the first circulation tank 10 has the same structure as the dispersing mechanism 80 on the second circulation tank 20.

[0076] like Figure 3 As shown, in the technical solution of this embodiment, the stirring mechanism 70 includes a stirring motor 71, a first rotating shaft 72, and stirring blades 73. The stirring motor 71 is disposed on the top of the first circulation tank 10 or the second circulation tank 20, the first rotating shaft 72 is connected to the motor shaft of the stirring motor 71 and extends into the interior of the first circulation tank 10 or the second circulation tank 20, and the stirring blades 73 are connected to the first rotating shaft 72.

[0077] Specifically, the stirring blade 73 is roughly U-shaped, and its outer contour is adapted to the bottom of the inner wall of the first circulation tank 10 and the second circulation tank 20. The first rotating shaft 72 is vertically arranged, with its upper end connected to the motor shaft of the stirring motor 71 and its lower end connected to the middle of the stirring blade 73. When the stirring motor 71 is started, it can drive the first rotating shaft 72 to rotate, thereby driving the stirring blade 73 to rotate.

[0078] like Figure 3 As shown, in the technical solution of this embodiment, the dispersing mechanism 80 includes a dispersing motor 81, a second rotating shaft 82, and a shearing blade 83. The dispersing motor 81 is disposed on the top of the first circulation tank 10 or the second circulation tank 20, the second rotating shaft 82 is connected to the motor shaft of the dispersing motor 81 and extends into the interior of the first circulation tank 10 or the second circulation tank 20, and the shearing blade 83 is connected to the second rotating shaft 82.

[0079] Specifically, the shear blades 83 have a disc-shaped structure. The second rotating shaft 82 is vertically arranged, and its upper end is connected to the motor shaft of the dispersing motor 81. Multiple sets of shear blades 83 can be arranged axially on the second rotating shaft 82. When the dispersing motor 81 is started, it can drive the second rotating shaft 82 to rotate, thereby driving the shear blades 83 to rotate.

[0080] Furthermore, from Figure 3 As can be seen, multiple sets of dispersing mechanisms 80 can be provided on the first circulation tank 10 and the second circulation tank 20, and the multiple sets of dispersing mechanisms 80 are arranged at intervals along the circumference. In this embodiment, two sets of dispersing mechanisms 80 are provided.

[0081] Since the first dispersing device 30 and the second dispersing device 40 described above have the same structure, one of them will be introduced.

[0082] like Figure 4 As shown, in this embodiment, both the first dispersing device 30 and the second dispersing device 40 include a housing 51, a dispersing stator 52, a dispersing rotor 53, and a discharge blade 54. The inlet and outlet are formed on the housing 51. The dispersing stator 52 is fixedly disposed within the housing 51 and has multiple first dispersing rings 521 arranged coaxially, with their diameters gradually increasing along the radial direction of the dispersing stator 52. The dispersing rotor 53 is rotatably disposed within the housing 51 and has multiple second dispersing rings 531 arranged coaxially, with their diameters gradually increasing along the radial direction of the dispersing rotor 53. The first and second dispersing rings 521 are staggered and have overlapping portions. The discharge blade 54 is fixedly disposed on the dispersing rotor 53.

[0083] from Figure 4As can be seen, the inlets of the first dispersing device 30 and the second dispersing device 40 are located at the top of the housing 51, and the outlets are located on the side of the upper end of the housing 51. Multiple first dispersing rings 521 and multiple second dispersing rings 531 are nested and staggered. A motor is installed inside the housing, which drives the dispersing rotor 53 to rotate at high speed via a rotating shaft. When the dispersing rotor 53 rotates at high speed, material can be drawn in from the inlet and subjected to high-speed shearing dispersion between the multiple first dispersing rings 521 and multiple second dispersing rings 531. After dispersion, the discharge blades 54 discharge the material from the outlet.

[0084] In the above structure, the first dispersion ring 521 and the second dispersion ring 531 adopt multi-layer dispersion, which increases the slurry dispersion residence time, resulting in high dispersion efficiency and short dispersion time.

[0085] Furthermore, in the technical solution of this embodiment, in step S1, the binder turbid liquid is circulated once between the pulping machine 100 and the first circulation tank 10.

[0086] Specifically, because the amount of binder powder in the formula is small and the powder feeding speed is relatively fast, the powder feeding can be completed in one cycle. At the same time, two dispersion mechanisms 80 are set in the first circulation tank 10 to ensure that the adhesive liquid is always in a dispersed state.

[0087] Preferably, in step S1, the binder powder is uniformly fed into the pulping machine 100, and the solvent is uniformly fed and transported into the first circulation tank 10.

[0088] In the technical solution of this embodiment, in step S2, while the remaining powder is being fed, a first preset number of cycles are performed between the pulper 100 and the first circulation tank 10.

[0089] In step S2, the undissolved binder solution is continuously dissolved while the main powder and conductive agent are added, dispersed, and circulated to ensure that the binder participates in the dissolution process throughout the entire homogenization process.

[0090] Because there is a large amount of base powder, the powder application in step S2 needs to be carried out for six cycles, which is the first preset number of times mentioned above. The binder participates in the dissolution process throughout the six double-cycle time periods.

[0091] Of course, the first preset number of times mentioned above can also be selected as other values, such as five times, seven times, eight times, etc.

[0092] In the technical solution of this embodiment, in step S3, the binder slurry and the remaining powder are circulated between the pulping machine and the circulation tank for a second preset number of times.

[0093] In step S3, after step S2 is completed, all powders are fed into the tank. Each material continues to circulate in a double cycle between the first circulation tank 10 and the second circulation tank 20. On the one hand, the binder continues to dissolve, and on the other hand, the slurry is dispersed.

[0094] Preferably, the second preset number of times is ten times, that is, in step S3 above, each material undergoes ten double-cycle dissolution and dispersion times between the first circulation tank 10 and the second circulation tank 20.

[0095] Of course, the second preset number of times mentioned above can also be selected as other values, such as eight times, nine times, eleven times, the second time, etc.

[0096] Furthermore, step S1 lasts for 2 to 5 minutes, step S2 lasts for 20 to 40 minutes, and step S3 lasts for 30 to 60 minutes.

[0097] Because the binder dosage in the formulation is relatively small, step S1 can be performed quickly (completed in a few minutes), and the overall homogenization process takes approximately one to two hours. The binder participates in the dissolution process throughout these one to two hours, resulting in the binder reaching a state of near-complete dissolution.

[0098] Furthermore, in step S2, the remaining powder materials fed include main powder and conductive agent.

[0099] like Figure 2 As shown, a buffer tank is also connected to the pulping machine. The pulp prepared in the pulping machine is tested and then pumped into the buffer tank for later use.

[0100] Example 2

[0101] like Figure 6 As shown, the difference between Embodiment 2 of the battery slurry preparation method according to this application and Embodiment 1 above is that, in step S1 above, the powder includes a binder, a main powder and a conductive powder, and in step S1, the binder, the main powder and the conductive agent are coarsely mixed together in a slurry mixer.

[0102] Specifically, in step S1 of the above embodiment, since the amount of binder is small, if the pulping machine 100 only dissolves and disperses the binder, it will result in a waste of pulping capacity. Therefore, in embodiment two, a conductive agent and a portion of the main powder are also added in step S1. The binder, a small amount of the main powder, and the conductive agent are added in a certain ratio and the powdering rate is controlled. The above materials and solvent are initially mixed in a single cycle through the pulping machine 100.

[0103] Preferably, each material is evenly powdered and the solvent is evenly conveyed, thereby preventing the mixed materials from sticking to the wall and affecting the formula ratio.

[0104] Preferably, the ratio of binder, main powder and conductive agent in step S1 is 1:5:0.5.

[0105] Furthermore, since conductive powder has already been added in step S1, in step S2, the remaining powder only includes the main powder, that is, no more conductive powder is added in step S2.

[0106] This application also provides a battery, which includes an electrode, the electrode including a metal foil and a slurry coated on the metal foil, the slurry being processed by the above-described slurry preparation method.

[0107] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing battery slurry, characterized in that, The pulping method is carried out by a pulper (100) and multiple circulation tanks, which are interconnected by circulation pipelines (60). The outlet and inlet of the pulper (100) are connected to the circulation pipelines (60) through a discharge pipe (200) and a feed pipe (300), respectively. The pulping method includes: Step S1: Add the powder to the pulper (100) and add the solvent to the circulation tank. The binder powder and solvent circulate between the pulper (100) and the circulation tank to obtain a coarsely mixed binder turbid liquid. The powder includes at least binder. All the binder powder is added in step S1. Step S2: The remaining powder is fed into the pulping machine. During the feeding process, the remaining powder and binder slurry circulate between the pulping machine (100) and the circulation tank. Step S3: After the material is fed, the slurry is circulated and dispersed among multiple circulation tanks. The circulation tank includes a first circulation tank (10) and a second circulation tank (20). The first circulation tank (10) has a first inlet (11) on its side and a first outlet (12) at its bottom. The second circulation tank (20) has a second inlet (21) on its side and a second outlet (22) at its bottom. The circulation pipeline (60) includes a main pipe (61), a first branch pipe (62) and a second branch pipe (63) disposed at a first end of the main pipe (61), and a third branch pipe (64) and a fourth branch pipe (65) disposed at a second end of the main pipe (61). The first branch pipe (62) is connected to the first inlet (11), the second branch pipe (63) is connected to the second inlet (21), the third branch pipe (64) is connected to the first outlet (12), and the fourth branch pipe (65) is connected to the second outlet (22). The bottom of the first circulation tank (10) is provided with a first dispersing device (30), the inlet of the first dispersing device (30) is connected to the first outlet (12), the bottom of the second circulation tank (20) is provided with a second dispersing device (40), the inlet of the second dispersing device (40) is connected to the second outlet (22), the third branch pipe (64) is connected to the outlet of the first dispersing device (30), and the fourth branch pipe (65) is connected to the outlet of the second dispersing device (40).

2. The pulping method according to claim 1, characterized in that, The powder is entirely a binder. In step S1, the binder and the solvent are fed and conveyed uniformly.

3. The pulping method according to claim 1, characterized in that, In step S2, the binder slurry and the remaining powder are uniformly fed and transported between the pulping machine and the circulating tank for a first preset number of cycles.

4. The pulping method according to claim 1, characterized in that, In step S3, the circulation is performed a second preset number of times among multiple circulation tanks.

5. The pulping method according to any one of claims 1 to 4, characterized in that, Step S1 lasts for 2 to 5 minutes, step S2 lasts for 20 to 40 minutes, and step S3 lasts for 30 to 60 minutes.

6. The pulping method according to any one of claims 1 to 4, characterized in that, The remaining powders include main powder and conductive agent.

7. The pulping method according to claim 1, characterized in that, The powder includes a binder, a main powder, and a conductive agent. In step S1, the binder, the main powder, and the conductive agent are coarsely mixed together in a pulping machine.

8. The pulping method according to claim 7, characterized in that, In step S1, the ratio of the binder, the main powder, and the conductive agent is 1:5:0.

5.

9. The pulping method according to claim 6, characterized in that, The remaining powders include the main powder.

10. The pulping method according to claim 1, characterized in that, The first branch pipe (62) is provided with a first switch structure (621), the second branch pipe (63) is provided with a second switch structure (631), the third branch pipe (64) is provided with a third switch structure (641), and the fourth branch pipe (65) is provided with a fourth switch structure (651).

11. The pulping method according to claim 1, characterized in that, A heat exchanger (611) is installed inside the main pipe (61).

12. The pulping method according to claim 1, characterized in that, The top of both the first circulation tank (10) and the second circulation tank (20) is provided with a stirring mechanism (70) and a dispersing mechanism (80).

13. The pulping method according to claim 1, characterized in that, Both the first dispersing device (30) and the second dispersing device (40) include: A housing (51), the inlet and the outlet are formed on the housing (51); A dispersion stator (52) is fixedly disposed inside the housing (51). A plurality of first dispersion rings (521) are disposed on the dispersion stator (52). The plurality of first dispersion rings (521) are coaxially disposed and their diameter gradually increases along the radial direction of the dispersion stator (52). A dispersing rotor (53) is rotatably disposed inside the housing (51). A plurality of second dispersing rings (531) are disposed on the dispersing rotor (53). The plurality of second dispersing rings (531) are coaxially disposed and their diameter gradually increases along the radial direction of the dispersing rotor (53). The first dispersing ring (521) and the second dispersing rings (531) are misaligned and have overlapping portions. The discharge blades (54) are fixedly mounted on the dispersing rotor (53).

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