Slurry pre-dispersion system and battery production device

Abstract

The present application provides a slurry pre-dispersion system and a battery production device. The slurry pre-dispersion system comprises a tank body mechanism, a pipeline assembly and first pumping devices. The tank body mechanism comprises at least two stirring tanks serving as containers for pre-dispersing conductive slurry, and each stirring tank comprises a first interface and a second interface which are communicated with a tank body. One end of each first pipeline is connected to the first interface of one of the stirring tanks, and the other end of the first pipeline is connected to the second interface of the other stirring tank. Two first pipelines are independently connected between the two stirring tanks, and the conductive slurry can be synchronously transferred between the two stirring tanks, achieving pre-dispersion of the conductive slurry. Each first pumping device is located on the corresponding first pipeline and provides power for enabling materials in the stirring tanks to flow from the second interface of one of the stirring tanks to the other stirring tank via the first interface of the other stirring tank. By means of the first pipelines independently arranged between the two stirring tanks, pre-dispersion of the conductive slurry can be synchronously achieved in the two stirring tanks, improving the production efficiency.

Description

Slurry pre-dispersion system and device for producing battery

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202421105293.5, filed on May 21, 2024, entitled “Slurry pre-dispersion system and device for producing battery”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of conductive slurry pre-dispersion, in particular to a slurry pre-dispersion system and a device for producing a battery. BACKGROUND

[0004] With the increasing market demand for the battery industry, the preparation of battery slurry for large enterprises has also increased exponentially, and the market size of conductive slurry is also expanding. Among them, carbon nanotube conductive slurry has been widely used due to its excellent conductive performance.

[0005] However, the traditional conductive slurry dispersion system uses a large-capacity tank for single-tank self-circulation dispersion, or uses a double-tank system, in which a regulator and a solvent are added to one of the stirring tanks and pre-dispersed, and after dispersion is completed, the other stirring tank is switched to continue pre-dispersion. The above two forms are batch production, and the dispersion efficiency of the dispersion process is low and the dispersion performance is poor, and the production efficiency is low.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a slurry pre-dispersion system and a device for producing a battery, which can improve the production efficiency of conductive slurry.

[0008] In a first aspect, the present application provides a slurry pre-dispersion system for a battery, the slurry pre-dispersion system comprising: a tank mechanism comprising at least two stirring tanks, the stirring tank comprising a tank body and a first interface and a second interface in communication with the tank body; a pipe assembly comprising a first pipe, at least two first pipes being connected between the two stirring tanks, and one end of the first pipe being connected to the first interface of one of the stirring tanks, the other end of the first pipe being connected to the second interface of the other stirring tank; and a first pumping device located in the first pipe and providing a driving force for the material in the stirring tank to flow from the second interface of one of the stirring tanks to the other stirring tank through the first interface of the other stirring tank.

[0009] According to an aspect of the present application, the slurry pre-dispersion system comprises a tank mechanism, a pipeline assembly and a first pumping device. The tank mechanism comprises at least two stirring tanks as containers for pre-dispersing the conductive slurry, and each stirring tank comprises a tank body and a first interface and a second interface in communication with the tank body. The pipeline assembly comprises first pipelines, and at least two first pipelines are connected between the two stirring tanks to form an inverted tank system. The first interface can be an inlet of the tank body, and the second interface can be an outlet of the tank body. One end of the first pipeline is connected to the first interface of one of the stirring tanks, and the other end of the first pipeline is connected to the second interface of the other stirring tank. The two first pipelines are independently connected between the two stirring tanks, and the conductive slurry can be synchronously transported between the two stirring tanks to realize pre-dispersion of the conductive slurry. The first pumping device is located in the first pipeline and provides power for the material in the stirring tank to flow from the second interface of one of the stirring tanks to the other stirring tank through the first interface of the other stirring tank. In the present application, the first pipelines independently arranged between the two stirring tanks can realize synchronous pre-dispersion of the conductive slurry in the two stirring tanks, thereby improving production efficiency.

[0010] In some embodiments, the stirring tank further comprises a third interface and a fourth interface, and the third interface and the fourth interface are in communication with the tank body. The pipeline assembly further comprises a second pipeline, and one end of the second pipeline is connected to the third interface and the other end of the second pipeline is connected to the fourth interface in the same stirring tank. The second pipeline is provided with a second pumping device to provide power for the material to flow from the third interface to the fourth interface through the second pipeline and back into the same stirring tank.

[0011] In the present application, the pipeline assembly further comprises a second pipeline, and the second pipeline is in communication with the same stirring tank and forms a self-circulation system of the stirring tank. The third interface serves as an outlet of the self-circulation system, and the fourth interface serves as an inlet of the self-circulation system. The second pipeline is provided with a second pumping device to provide power for the conductive slurry to flow from the third interface to the fourth interface through the second pipeline and back into the same stirring tank. The conductive slurry is circulated in the same stirring tank to realize stirring of the conductive slurry and reduce the viscosity of the conductive slurry. At the same time, the self-circulation system replaces the original metal stirring paddle to stir the conductive slurry, thereby reducing the risk of introducing metal particles caused by friction between the stirring paddle and the conductive slurry during stirring.

[0012] In some embodiments, the pipeline assembly further comprises a first three-way valve, a first transmission end of the first three-way valve is in communication with the tank body, a second transmission end of the first three-way valve is in communication with the second interface, and a third transmission end of the first three-way valve is in communication with the third interface.

[0013] In the scheme of the embodiment of the application, the pipeline assembly further comprises a first three-way valve, the tank body, the second interface and the third interface are communicated through the first three-way valve, the structure is simple, and the first pipeline and the second pipeline are convenient to disassemble and maintain.

[0014] In some embodiments, the pipeline assembly further comprises a second three-way valve, the second pipeline comprises a first sub-section and a second sub-section, the first transmission end of the second three-way valve is communicated with the first sub-section, the second transmission end of the second three-way valve is communicated with the second sub-section, and the third transmission end of the second three-way valve is used for discharging residual materials in the second pipeline.

[0015] In the scheme of the embodiment of the application, the pipeline assembly further comprises a second three-way valve, the second pipeline comprises a first sub-section and a second sub-section, the second three-way valve is communicated with the first sub-section and the second sub-section, and the third transmission end of the second three-way valve is used for discharging residual materials in the second pipeline, so that the pipeline assembly is convenient to clean and cross contamination of materials is avoided.

[0016] In some embodiments, the fourth interface is provided with a nozzle on the side away from the second pipeline, the nozzle comprises a body part and a branch part, the body part is communicated with the fourth interface, and the branch part extends along a spiral path in the direction away from the body part.

[0017] In the scheme of the embodiment of the application, the body part of the nozzle is communicated with the fourth interface, and the branch part extends along a spiral path in the direction away from the body part. The conductive paste can be uniformly and widely sprayed along the spiral path into the tank body, and the uniformity of the paste is ensured.

[0018] In some embodiments, the radial dimension of the branch part gradually decreases in the direction away from the body part.

[0019] In the scheme of the embodiment of the application, the radial dimension of the branch part gradually decreases in the direction away from the body part, the coincidence of the paths of the conductive paste during spraying can be reduced, and the dispersion degree of the conductive paste spraying is further improved, and the viscosity of the paste is reduced.

[0020] In some embodiments, the first interface and the second interface are arranged at intervals along a first direction, and the angle between the extension direction of the body part and the first direction is 0-90°.

[0021] In the scheme of the embodiment of the application, the first interface and the second interface are arranged at intervals along a first direction, and the angle between the extension direction of the body part and the first direction is 0-90°, that is, the angle between the extension direction of the body part and the extension direction of the inner wall of the tank body is 0-90°, the conductive paste is not easy to stick to the inner wall of the tank body, and the dispersion degree of the conductive paste spraying is further improved.

[0022] In some embodiments, the pipeline assembly further comprises a demagnetization system, at least one of the two first pipelines between the two stirring tanks is provided with a demagnetization system to remove magnetic particles in the stirring tank.

[0023] In the scheme of the embodiments of the present application, at least one of the two first pipelines between the two stirring tanks is provided with a demagnetization system, which can further filter out the magnetic particles in the stirring tank.

[0024] In some embodiments, both of the two first pipelines between the two stirring tanks are provided with a demagnetization system to remove magnetic particles in the stirring tank, so as to produce qualified conductive slurry and ensure the safety performance of the battery.

[0025] In the scheme of the embodiments of the present application, both of the two first pipelines between the two stirring tanks are provided with a demagnetization system to remove magnetic particles in the stirring tank. This can effectively reduce the number of demagnetization passes, improve the demagnetization efficiency, improve the production capacity rhythm, and save the factory space and reduce the production cost.

[0026] In a second aspect, the embodiments of the present application further provide a device for producing a battery, which comprises the slurry pre-dispersion system, the double planetary mixer and the coating machine of any one of the first aspect, the double planetary mixer is used for mixing and stirring the pre-dispersed slurry and additives, and the coating machine is used for coating the slurry to a preset position.

[0027] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, the embodiments can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals are used throughout the various drawings to designate the same or similar parts. In the drawings:

[0029] FIG. 1 is a structural schematic diagram of a slurry pre-dispersion system according to an embodiment of the present application;

[0030] FIG. 2 is a structural schematic diagram of a nozzle according to an embodiment of the present application;

[0031] FIG. 3 is a comparison diagram of the magnetic particle level of the slurry produced by the battery slurry pre-dispersion system according to an embodiment of the present application and the slurry produced by the prior art (the solid line represents the magnetic particle level of the slurry produced by the prior art, and the dashed line represents the magnetic particle level of the slurry produced by the present application);

[0032] Figure 4 is a comparison chart of the processing performance of a battery slurry pre-dispersion system according to an embodiment of the present application and prior art (the solid line represents the processing performance of prior art, and the dashed line represents the processing performance of the present application) ;

[0033] Figure 5 is a comparison chart of the D50 value of a battery slurry pre-dispersion system according to an embodiment of the present application and prior art produced slurry (the solid line represents the D50 value of prior art produced slurry, and the dashed line represents the D50 value of the present application produced slurry).

[0034] Reference signs: 1, tank mechanism; 101, stirring tank; 102, tank body; 103, first interface; 104, second interface; 105, third interface; 106, fourth interface; 107, observation port; 2, pipeline assembly; 201, first pipeline; 202, second pipeline; 202a, first sub-section; 202b, second sub-section; 203, first three-way valve; 204, second three-way valve; 3, first pumping device; 301, second pumping device; 4, nozzle; 401, body part; 402, sub-part; 5, demagnetization system; 501, permanent magnet demagnetizer; 502, filter element; 503, electric demagnetizer; X, first direction. DETAILED DESCRIPTION

[0035] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0042] At present, from the development of market situation, the application of power battery is more and more extensive. Power battery is not only applied to energy storage power supply system of water power, fire power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0043] With the increasing market demand of the battery industry, the preparation of battery paste of large enterprises is also increased by several times, and the market scale of conductive paste is also expanding. Among them, carbon nanotube conductive paste is widely used due to its excellent conductivity. For conductive paste, safety performance and dispersion performance are key performance indicators, and metal foreign matter will directly affect the safety performance of the battery, so metal foreign matter must be strictly controlled during the production of conductive paste.

[0044] However, the raw materials of the currently industrialized carbon nanotube powder are mostly metal-based (iron, cobalt, nickel) catalysts, so even high-purity powder still contains metal particles, affecting the performance of the slurry product and the safety performance of the battery.

[0045] The inventors found in the research process that in the prior art, the traditional conductive slurry dispersion system uses a metal stirring paddle type large-capacity tank for single-tank self-circulation dispersion, which is intermittent production, that is, the adjusting agent and solvent are first added in one stirring tank for pre-dispersion, and after the dispersion is completed, the pre-dispersion is continued in another stirring tank. It has been verified through practice that the dispersion efficiency of this dispersion process is low and the dispersion performance is poor. In addition, the stirring paddle is mostly made of metal material. Under the action of high-speed shearing force, the stirring paddle and the slurry produce friction, and there will be phenomena such as wear of the stirring paddle during long-term use, which has the risk of introducing metal particles, affecting the performance of the slurry product, and thus affecting the safety performance of the battery. At the same time, the metal moving parts such as stirring shaft, shaft seal, and bearing will also be worn due to mutual friction during rotation. Since the current stirring tank manufacturing industry mostly uses mechanical seals, but cannot achieve complete sealing, there is a certain industry technical bottleneck and practical difficulty. The metal moving parts will randomly fall into the conductive slurry after wear, which also has the risk of introducing magnetic particles, and this risk is uncontrollable, directly leading to a decrease in the stability of the magnetic particle level of the finished slurry.

[0046] Based on the above problems, the present application provides a slurry pre-dispersion system, which comprises a self-circulation system and a reverse tank system. At least two stirring tanks are used as containers for pre-dispersion of conductive slurry, and the stirring tank comprises a tank body and a plurality of interfaces communicating with the tank body. A second pipeline communicates the tank body of the same stirring tank to form a self-circulation system, and at least two first pipelines are connected between two stirring tanks to form a reverse tank system. The self-circulation system replaces the original metal stirring paddle for stirring the conductive slurry, reducing the risk of introducing metal particles caused by friction between the stirring paddle and the conductive slurry during stirring. The reverse tank system can simultaneously realize pre-dispersion of the conductive slurry in the two stirring tanks, improving the production efficiency.

[0047] FIG. 1 is a structural schematic diagram of a slurry pre-dispersion system according to an embodiment of the present application.

[0048] Referring to FIG. 1, the embodiment of the first aspect of the present application provides a slurry pre-dispersion system, which comprises a tank mechanism 1, a pipeline assembly 2 and a first pumping device 3. The tank mechanism 1 comprises at least two stirring tanks 101, and each stirring tank 101 comprises a tank body 102 and a first interface 103 and a second interface 104 which are in communication with the tank body 102. The pipeline assembly 2 comprises first pipelines 201, and at least two first pipelines 201 are connected between the two stirring tanks 101 to form a reverse tank system. The first interface 103 can be an inlet of the tank body 102, and the second interface 104 can be an outlet of the tank body 102. One end of each first pipeline 201 is connected to the first interface 103 of one of the stirring tanks 101, and the other end of each first pipeline 201 is connected to the second interface 104 of the other stirring tank 101. The two first pipelines 201 are independently connected between the two stirring tanks 101, and the conductive slurry can be synchronously transported between the two stirring tanks 101 to realize pre-dispersion of the conductive slurry. The first pumping device 3 is located in the first pipeline 201 and provides power for the material in the stirring tank 101 to flow from the second interface 104 of one of the stirring tanks 101 to the first interface 103 of the other stirring tank 101.

[0049] In the scheme of the embodiment of the present application, the present application provides a slurry pre-dispersion system, which comprises a tank mechanism 1, a pipeline assembly 2 and a first pumping device 3. The tank mechanism 1 comprises at least two stirring tanks 101 as containers for pre-dispersion of conductive slurry, and each stirring tank 101 comprises a tank body 102 and a first interface 103 and a second interface 104 which are in communication with the tank body 102. The pipeline assembly 2 comprises first pipelines 201, and at least two first pipelines 201 are connected between the two stirring tanks 101 to form a reverse tank system. The first interface 103 can be an inlet of the tank body 102, and the second interface 104 can be an outlet of the tank body 102. One end of each first pipeline 201 is connected to the first interface 103 of one of the stirring tanks 101, and the other end of each first pipeline 201 is connected to the second interface 104 of the other stirring tank 101. The two first pipelines 201 are independently connected between the two stirring tanks 101, and the conductive slurry can be synchronously transported between the two stirring tanks 101 to realize pre-dispersion of the conductive slurry. The first pumping device 3 is located in the first pipeline 201 and provides power for the material in the stirring tank 101 to flow from the second interface 104 of one of the stirring tanks 101 to the first interface 103 of the other stirring tank 101. In the embodiment of the present application, the first pipelines 201 which are independently arranged between the two stirring tanks 101 can realize synchronous pre-dispersion of the conductive slurry in the two stirring tanks 101, thereby improving production efficiency.

[0050] Optionally, the tank body 102 further comprises an observation port 107 which is arranged on the same side as the first interface 103, and the observation port 107 can be used to observe the pre-dispersion of the conductive slurry in the stirring tank 101.

[0051] Optionally, the inner wall of the stirring tank 101 can be a plasma mirror surface body, which facilitates the flow of the conductive slurry in the tank body 102 and reduces the number of manual cleanings because the conductive slurry is not easy to remain on the inner wall.

[0052] Optionally, the first pumping device 3 can be a diaphragm pump for providing power for the conductive slurry to be transported in the first pipe 201 and the stirring tank 101.

[0053] In some embodiments, the stirring tank 101 further comprises a third interface 105 and a fourth interface 106, both of which are in communication with the tank body 102. The pipe assembly 2 further comprises a second pipe 202, which is connected to the third interface 105 at one end and connected to the fourth interface 106 at the other end in the same stirring tank 101. The second pipe 202 is provided with a second pumping device 301 to provide power for the material to flow from the third interface 105 to the fourth interface 106 via the second pipe 202 and back into the same stirring tank 101.

[0054] In these embodiments, the stirring tank 101 further comprises a third interface 105 and a fourth interface 106. The pipe assembly 2 further comprises a second pipe 202, which is in communication with the same stirring tank 101 and constitutes a self-circulation system of the stirring tank 101. Among them, the third interface 105 serves as the outlet of the self-circulation system, and the fourth interface 106 serves as the inlet of the self-circulation system. The second pipe 202 is provided with a second pumping device 301 to provide power for the conductive slurry to flow from the third interface 105 to the fourth interface 106 via the second pipe 202 and back into the same stirring tank 101. The circulation of the conductive slurry in the same stirring tank 101 realizes the stirring of the conductive slurry and reduces the viscosity of the conductive slurry. At the same time, the self-circulation system replaces the original metal stirring paddle to stir the conductive slurry, reducing the risk of introducing metal particles caused by the friction between the stirring paddle and the conductive slurry during stirring.

[0055] Optionally, the third interface 105 and the second interface 104 are located on one side of the tank body 102, and the fourth interface 106 and the first interface 103 are located on the opposite side of the tank body 102. Optionally, during use, the first interface 103 is usually located above the tank body 102, and the second interface 104 is located below the tank body 102. When the first pumping device 3 draws the conductive slurry, it can use the gravity of the slurry itself to fall into the tank body 102, reducing energy consumption. Therefore, when the second pumping device 301 draws the conductive slurry, it can also use the gravity of the slurry itself to fall into the tank body 102, reducing energy consumption.

[0056] Optionally, a stirring paddle extending along the depth direction of the tank body 102 can be arranged in the tank body 102. The stirring paddle is used to stir the conductive slurry, pre-disperse the conductive slurry, and reduce the possibility of insufficient stirring of the conductive slurry. The self-circulation system can reduce the frequency of use of the stirring paddle, thereby reducing the risk of introducing metal particles. The stirring paddle serves as a backup stirring device to prevent the risk of the self-circulation system being blocked and being unable to pre-disperse the conductive slurry.

[0057] Optionally, the tank body 102 can also not be provided with a stirring paddle, and the self-circulation system can reduce the use frequency of the stirring paddle or even not use the stirring paddle, while not reducing the production efficiency, reducing the risk of introducing metal particles under the premise of ensuring the complete dispersion of the conductive paste.

[0058] Optionally, in the pipeline assembly 2, the first pipeline 201 and the second pipeline 202 are both made of polytetrafluoroethylene pipelines and fittings of non-magnetic materials, which reduces the risk of introducing metal particles and has the characteristics of high temperature resistance and corrosion resistance.

[0059] Optionally, the first pumping device 3 and the second pumping device 301 can be 1-inch or 1.5-inch diaphragm pumps. The first pumping device 3 and the second pumping device 301 can be diaphragm pumps of the same size or diaphragm pumps of different sizes.

[0060] In some embodiments, the pipeline assembly 2 further comprises a first three-way valve 203, a first transmission end of the first three-way valve 203 being in communication with the tank body 102, a second transmission end of the first three-way valve 203 being in communication with the second interface 104, and a third transmission end of the first three-way valve 203 being in communication with the third interface 105.

[0061] In these embodiments, the pipeline assembly 2 further comprises a first three-way valve 203, which communicates the tank body 102, the second interface 104, and the third interface 105. Thus, the simultaneous and continuous automatic production of the reverse tank system and the self-circulation system is realized, the discharge is uniform, and the production efficiency is improved. At the same time, the structure is simple, and the first pipeline 201 and the second pipeline 202 are easy to disassemble and maintain.

[0062] Optionally, the first transmission end of the first three-way valve 203 can be directly in communication with the tank body 102 or can be in communication with the tank body 102 through a separate pipeline.

[0063] In some embodiments, the pipeline assembly 2 further comprises a second three-way valve 204, the second pipeline 202 comprising a first sub-section 202a and a second sub-section 202b, a first transmission end of the second three-way valve 204 being in communication with the first sub-section 202a, a second transmission end of the second three-way valve 204 being in communication with the second sub-section 202b, and a third transmission end of the second three-way valve 204 being used to discharge residual materials in the second pipeline 202.

[0064] In these embodiments, the pipeline assembly 2 further comprises a second three-way valve 204, the second pipeline 202 comprising a first sub-section 202a and a second sub-section 202b, the second three-way valve 204 communicating the first sub-section 202a and the second sub-section 202b, and the third transmission end of the second three-way valve 204 being used to discharge residual materials in the second pipeline 202, which facilitates the cleaning of the pipeline assembly 2 and avoids cross-contamination of materials.

[0065] Optionally, a plurality of second three-way valves 204 can be arranged on the first pipe 201 and the second pipe 202 to discharge residual materials in the pipe assembly 2, facilitate cleaning of the pipe assembly 2, and avoid cross-contamination of materials.

[0066] In some embodiments, as shown in FIG. 1 and FIG. 2, the fourth interface 106 is provided with a nozzle 4 on the side facing away from the second pipe 202, the nozzle 4 comprising a body portion 401 and a branch portion 402, the body portion 401 being in communication with the fourth interface 106, and the branch portion 402 extending along a spiral path in a direction away from the body portion 401.

[0067] In these embodiments, the body portion 401 of the nozzle 4 is in communication with the fourth interface 106, and the branch portion 402 extends along a spiral path in a direction away from the body portion 401. The conductive paste can be uniformly and widely sprayed along the spiral path into the interior of the tank 102, ensuring uniformity of the paste.

[0068] Optionally, in order to avoid the risk of re-introducing metal particles, the nozzle 4 is made of non-metallic polytetrafluoroethylene material, which has the characteristics of corrosion resistance and high temperature resistance.

[0069] In some embodiments, the radial dimension of the branch portion 402 gradually decreases in the direction away from the body portion 401.

[0070] In these embodiments, the radial dimension of the branch portion 402 gradually decreases in the direction away from the body portion 401, which can reduce the overlap of the path when the conductive paste is sprayed, thereby further improving the dispersion degree of the conductive paste spraying and reducing the viscosity of the paste. The radial dimension of the branch portion 402 is the extension radius of the spiral path when the branch portion 402 extends along the spiral path, and the cross-sectional dimension of the spiral path in the extension direction of the body portion 401 gradually decreases. In the direction away from the body portion 401, the extension radius of the branch portion 402 becomes smaller and smaller, and the branch portion 402 becomes more and more gathered.

[0071] In some embodiments, the first interface 103 and the second interface 104 are arranged at intervals along a first direction, and the extension direction of the body portion 401 forms an angle of 0-90° with the first direction.

[0072] In these embodiments, the first interface 103 and the second interface 104 are arranged at intervals along a first direction, and the extension direction of the body portion 401 forms an angle of 0-90° with the first direction, that is, the extension direction of the body portion 401 forms an angle of 0-90° with the extension direction of the inner wall of the tank 102, so that the conductive paste is less likely to stick to the inner wall of the tank 102, thereby further improving the dispersion degree of the conductive paste spraying.

[0073] Optionally, the angle between the extension direction of the body part 401 and the first direction X is 45-60°, which can spray the conductive paste into the tank 102 in a large range without being easily attached to the inner wall of the tank 102, and ensure the dispersion degree of the conductive paste.

[0074] In some embodiments, the pipeline assembly 2 further comprises a magnetic removal system 5, at least one of the two first pipelines 201 between the two stirring tanks 101 is provided with the magnetic removal system 5 to remove the magnetic particles in the stirring tank 101.

[0075] In these embodiments, at least one of the two first pipelines 201 between the two stirring tanks 101 is provided with the magnetic removal system 5, which can further filter out the magnetic particles in the stirring tank 101.

[0076] In some embodiments, both of the two first pipelines 201 between the two stirring tanks 101 are provided with the magnetic removal system 5, and the parallel magnetic removal system 5 is used to remove the magnetic particles in the stirring tank 101, so as to produce qualified conductive paste and ensure the safety performance of the battery.

[0077] In these embodiments, both of the two first pipelines 201 between the two stirring tanks 101 are provided with the magnetic removal system 5 to remove the magnetic particles in the stirring tank 101. This can effectively reduce the number of magnetic removal passes, improve the magnetic removal efficiency, improve the production capacity rhythm, save the factory space, and reduce the production cost.

[0078] Optionally, the magnetic removal system 5 comprises an electric magnetic removal machine 503, a filter element 502 and a permanent magnetic removal device 501 which are sequentially and spaced apart in the first pipeline 201 along the direction from the second interface 104 to the first interface 103. The electric magnetic removal machine 503 can remove about 80% of the magnetic particles, and the filter element 502 and the permanent magnetic removal device 501 are used for further magnetic removal.

[0079] Optionally, the two first pipelines 201 between the two stirring tanks 101 are provided with the magnetic removal system 5 in parallel. For convenience of description, one of the two stirring tanks 101 is referred to as tank A, and the other is referred to as tank B. The magnetic removal process can be multiple passes, and the parallel magnetic removal system 5 means that the conductive paste flows from the second interface 104 of the tank A to the first pipeline 201, first passes through the electric magnetic removal machine 503 for the first pass of magnetic removal, and then flows into the tank B through the first interface 103 of the tank B. Then the conductive paste flows from the second interface 104 of the tank B to the first pipeline 201, and then passes through the electric magnetic removal machine 503 for the second pass of magnetic removal, and then flows into the tank A through the first interface 103 of the tank A. Then the conductive paste flows from the second interface 104 of the tank A to the first pipeline 201, and then passes through the permanent magnetic removal device 501 for the third pass of magnetic removal, and then flows into the tank B through the first interface 103 of the tank B. The magnetic removal work is repeated in this way to reduce the magnetic particles in the conductive paste.

[0080] Optionally, as shown in FIG. 3, the solid line is the number of magnetic particles in the conductive paste samples produced by the prior art in different batches, and the dashed line is the number of magnetic particles in the conductive paste samples produced by the slurry pre-dispersion system in different batches. In the prior art, there are 30-80 magnetic particles per 4 kg of product. In the scheme of the embodiment of the application, the number of magnetic particles per 4 kg of product is reduced to less than 10, and the control of magnetic particles after the modification is more stable.

[0081] Optionally, as shown in FIG. 4, the solid line is the product viscosity of the conductive paste samples produced by the prior art in different batches, and the dashed line is the product viscosity of the conductive paste samples produced by the slurry pre-dispersion system in different batches. As shown in FIG. 5, the solid line is the D50 value of the conductive paste samples produced by the prior art in different batches, and the dashed line is the D50 value of the conductive paste samples produced by the slurry pre-dispersion system in different batches. D50 is a particle size specification of a chemical material, which refers to the value of 50% particle size diameter. In the prior art, the product viscosity is 100-5000 cp, and D50 is 1-4 μm. In the scheme of the embodiment of the application, the product viscosity is 100-5000 cp, and D50 is 1.5-3 μm. After the modification, the particle size distribution is more concentrated, and the product uniformity is better.

[0082] Optionally, in the prior art, single-tank production is mostly used, and the production rhythm is 1.2-1.5 tons / 8 hours. In the scheme of the embodiment of the application, the self-circulation system is combined with the tank overturning system and the magnetic removal system 5, and the production rhythm is 2.2-2.5 tons / 8 hours. The dispersion process is optimized, and the production efficiency is improved by about 1 times after the modification.

[0083] Optionally, the self-circulation system, the tank overturning system and the magnetic removal system 5 in the application are operated synchronously. For different types of slurry, the process time is inconsistent. Generally, the number of magnetic removal passes is counted. The next process will be performed after 3-5 magnetic removal passes of the slurry pre-dispersion system.

[0084] Optionally, in the prior art, the magnetic removal system 5 needs to be used for 10-15 times of magnetic removal to produce qualified slurry. In the scheme of the embodiment of the application, the self-circulation system is combined with the tank overturning system and the magnetic removal system 5, and the inner wall of the stirring tank 101 is treated by plasma mirror surface. Only 2-3 times of magnetic removal can produce qualified slurry.

[0085] The embodiment of the application also provides a device for producing a battery, which comprises the slurry pre-dispersion system of any one of the first aspect, a double-planetary stirrer and a coating machine. The double-planetary stirrer is used for mixing and stirring the slurry after pre-dispersion with additives. The coating machine is used for coating the slurry to a preset position.

[0086] Optionally, a double planetary mixer is used to mix the slurry of the cathode material of the battery and various additives and binders.

[0087] Optionally, the coating machine can uniformly coat the conductive slurry on the target surface through precise coating control to ensure the conductive performance of the electronic device.

[0088] In the scheme of the embodiment of the application, the application provides a device for producing a battery, which comprises a slurry pre-dispersion system, the slurry pre-dispersion system comprising a tank mechanism 1, a pipeline assembly 2 and a first pumping device 3. The tank mechanism 1 comprises at least two stirring tanks 101 as containers for pre-dispersing the conductive slurry, the stirring tank 101 comprising a tank body 102 and a first interface 103 and a second interface 104 in communication with the tank body 102. The pipeline assembly 2 comprises a first pipeline 201, and at least two first pipelines 201 are connected between the two stirring tanks 101 to form an inverted tank system. The first interface 103 can be an inlet of the tank body 102, the second interface 104 can be an outlet of the tank body 102, and one end of the first pipeline 201 is connected to the first interface 103 of one of the stirring tanks 101, and the other end of the first pipeline 201 is connected to the second interface 104 of the other stirring tank 101. The two first pipelines 201 are independently connected between the two stirring tanks 101, and the conductive slurry can be synchronously transported between the two stirring tanks 101 to realize pre-dispersion of the conductive slurry. The first pumping device 3 is located in the first pipeline 201 and provides power for the material in the stirring tank 101 to flow from the second interface 104 of one of the stirring tanks 101 to the other stirring tank 101 through the first interface 103 of the other stirring tank 101. In the embodiment of the application, by connecting the independently arranged first pipelines between the two stirring tanks 101, the pre-dispersion of the conductive slurry can be realized synchronously in the two stirring tanks 101, and the production efficiency is improved.

[0089] In some embodiments, the slurry pre-dispersion system comprises a tank mechanism 1, a pipeline assembly 2 and a first pumping device 3. The tank mechanism 1 comprises at least two stirred tanks 101, each of which comprises a tank body 102, a first interface 103 and a second interface 104. The pipeline assembly 2 comprises at least two first pipelines 201, each of which is connected between two stirred tanks 101 and has one end connected to the first interface 103 of one of the stirred tanks 101 and the other end connected to the second interface 104 of the other stirred tank 101. The first pumping device 3 is arranged in the first pipeline 201 and provides power for the material in the stirred tank 101 to flow from the second interface 104 of one of the stirred tanks 101 to the other stirred tank 101 via the first interface 103 of the other stirred tank 101. The stirred tank 101 further comprises a third interface 105 and a fourth interface 106, both of which are in communication with the tank body 102. The pipeline assembly 2 further comprises a second pipeline 202, which has one end connected to the third interface 105 and the other end connected to the fourth interface 106 in the same stirred tank 101. The second pipeline 202 is provided with a second pumping device 301 to provide power for the material to flow from the third interface 105 to the fourth interface 106 via the second pipeline 202 and back into the same stirred tank 101. The pipeline assembly 2 further comprises a first three-way valve 203, which has a first transmission end in communication with the tank body 102, a second transmission end in communication with the second interface 104, and a third transmission end in communication with the third interface 105. The pipeline assembly 2 further comprises a second three-way valve 204, and the second pipeline 202 comprises a first sub-section 202a and a second sub-section 202b. The second three-way valve 204 has a first transmission end in communication with the first sub-section 202a, a second transmission end in communication with the second sub-section 202b, and a third transmission end for discharging residual material in the second pipeline 202. The fourth interface 106 is provided with a nozzle 4 on the side away from the second pipeline 202, and the nozzle 4 comprises a body portion 401 and a branch portion 402. The body portion 401 is in communication with the fourth interface 106, and the branch portion 402 extends in a spiral path away from the body portion 401. The radial dimension of the branch portion 402 gradually decreases away from the body portion 401. The first interface 103 and the second interface 104 are arranged in a first direction, and the extension direction of the body portion 401 forms an angle of 0-90° with the first direction. The pipeline assembly 2 further comprises a demagnetization system 5, which is arranged in at least one of the first pipelines 201 between the two stirred tanks 101 to remove magnetic particles in the stirred tank 101. Alternatively, the demagnetization system 5 is arranged in at least one of the first pipelines 201 between the two stirred tanks 101 to further filter out the magnetic particles in the stirred tank 101.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some or all of the technical features therein. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slurry pre-dispersion system, comprising: a tank mechanism including at least two mixing tanks, each of the mixing tanks including a tank body and a first interface and a second interface in communication with the tank body; a piping assembly including first pipes, at least two of the first pipes being connected between two of the mixing tanks, and one end of each of the first pipes being connected to the first interface of one of the mixing tanks and the other end of each of the first pipes being connected to the second interface of the other of the mixing tanks; a first pumping device in the first pipes and providing a driving force for the material in the mixing tanks to flow from the second interface of one of the mixing tanks to the first interface of the other of the mixing tanks.

2. The slurry pre-dispersion system of claim 1, wherein: the mixing tank further includes a third interface and a fourth interface, each of the third interface and the fourth interface being in communication with the tank body; the piping assembly further includes second pipes, one end of each of the second pipes being connected to the third interface and the other end of each of the second pipes being connected to the fourth interface in the same one of the mixing tanks, and each of the second pipes being provided with a second pumping device to provide a driving force for the material to flow through the third interface, via the second pipes, to the fourth interface and back into the same one of the mixing tanks.

3. The slurry pre-dispersion system of claim 2, wherein, the piping assembly further includes a first three-way valve, a first transmission end of the first three-way valve being in communication with the tank body, a second transmission end of the first three-way valve being in communication with the second interface, and a third transmission end of the first three-way valve being in communication with the third interface.

4. The slurry pre-dispersion system of claim 2, wherein, the piping assembly further includes a second three-way valve, the second pipes including a first sub-section and a second sub-section, a first transmission end of the second three-way valve being in communication with the first sub-section, a second transmission end of the second three-way valve being in communication with the second sub-section, and a third transmission end of the second three-way valve being used to discharge residual material in the second pipes.

5. The slurry pre-dispersion system of claim 2, wherein, the fourth interface being provided with a nozzle on a side facing away from the second pipes, the nozzle including a body portion and a branch portion, the body portion being in communication with the fourth interface, and the branch portion extending along a helical path in a direction away from the body portion.

6. The slurry pre-dispersion system of claim 5, wherein, a radial dimension of the branch portion gradually decreases in a direction away from the body portion.

7. The slurry pre-dispersion system of claim 5, wherein, the first interface and the second interface are spaced apart along a first direction, and an angle between an extending direction of the body portion and the first direction is 0-90°.

8. The slurry pre-dispersion system of claim 1, wherein, the piping assembly further includes a de-magnetic system, at least one of the first pipes between two of the mixing tanks being provided with the de-magnetic system to remove magnetic particles in the mixing tanks.

9. The slurry pre-dispersion system of claim 8, wherein, both of the first pipes between two of the mixing tanks are provided with the de-magnetic system to remove magnetic particles in the mixing tanks.

10. An apparatus for producing a battery, comprising the slurry pre-dispersion system of any one of claims 1 to 9, a double planetary mixer for mixing and stirring the slurry after pre-dispersion with additives, and a coater for coating the slurry to a predetermined position.

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