Battery slurry production system

Abstract

A battery slurry production system, comprising a main-material feeding system (1), an auxiliary-material feeding system (2), a mixing bin (40) and a slurrying machine (50), wherein the mixing bin (40) is configured to receive a main material and an auxiliary material and mix the main material with the auxiliary material; an input end of the slurrying machine (50) is in communication with an input end of the mixing bin (40), and is configured to generate a battery slurry from a mixture of the main material and the auxiliary material and a solvent; and at least one of the main-material feeding system (1) and the auxiliary-material feeding system (2) is provided with a filter unit (7).

Description

A battery slurry production system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application No. 202420209345.7, application date January 29, 2024, and utility model name “A battery slurry production system”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a battery slurry production system. Background Art

[0004] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in energy storage fields.

[0005] Battery cells are widely used in various electronic devices. Their electrode plates consist of a current collector and an active material layer coated on the surface of the current collector. The active material layer is formed by drying an active material slurry. The active material slurry consists of powdered active material, a solvent, a binder, and other ingredients, which are uniformly mixed to form the active material slurry. Battery slurry can be produced and delivered using a battery slurry production system.

[0006] Battery slurry production systems in related technologies employ multiple filtration devices during the transportation process from production to the coating die to remove large particles and metallic impurities from the slurry, ensuring qualified battery slurry. However, since all slurry filtration is concentrated during the transportation phase, the filtration pressure is high and the filtration difficulty is high.

[0007] Utility Model Content

[0008] To solve the above technical problems, the present disclosure provides a battery slurry production system, which starts filtering impurities during the transportation process of the main material and / or auxiliary material, reduces the impurity content of the produced battery slurry, alleviates the filtering pressure in the transportation stage, and increases the qualified rate of the battery slurry.

[0009] The present disclosure is achieved through the following technical solutions.

[0010] A first aspect of the present disclosure provides a battery slurry production system, comprising:

[0011] A main material feeding system, used for storing and conveying the main material, wherein the main material includes an active material, and the active material is a battery positive electrode active material or a battery negative electrode active material;

[0012] An auxiliary material feeding system is used to store and transport auxiliary materials, wherein the auxiliary materials include a binder and a conductive agent;

[0013] A mixing bin, the input end of which is connected to the output end of the main material feeding system and the output end of the auxiliary material feeding system, respectively, for receiving the main material and the auxiliary material and mixing the main material and the auxiliary material;

[0014] A pulping machine, the input end of which is connected to the output end of the mixing bin, for generating battery slurry from a mixture of main materials and auxiliary materials and a solvent;

[0015] Wherein, at least one of the main material feeding system and the auxiliary material feeding system is provided with a filtering unit.

[0016] In the technical solution of the embodiment of the present disclosure, a filtering unit is provided in at least one of the main material feeding system and the auxiliary material feeding system. Before entering the mixing bin, the filtering unit filters the impurities contained in the main material and / or auxiliary material during the production process, so that the impurity content of the main material and / or auxiliary material entering the pulping machine is low, so that the qualified rate of the battery slurry prepared by the pulping machine can also be higher, reducing the filtering pressure and filtering difficulty during the downstream battery slurry transportation, improving the qualified rate of the battery slurry, and increasing the safety performance of the battery.

[0017] In some embodiments, the main material loading system includes a main material feeder, a main material conveying pipeline, and a main material storage bin, and the filtering unit includes a first filtering unit. The main material feeder is used to convey the main material to the main material storage bin through the main material conveying pipeline, and the first filtering unit is arranged between the main material feeder and the main material conveying pipeline.

[0018] In the technical solution of the embodiment of the present disclosure, the first filtering unit is provided to filter the main material before the main material enters the main material conveying pipeline, thereby increasing the purity of the main material entering the main material conveying pipeline and the main material storage bin, and reducing the probability of impurities contained in the main material entering the main material conveying pipeline and the main material storage bin and affecting the purity of the main material, so that the main material has a higher purity during the conveying process, thereby increasing the qualified rate of the battery slurry prepared by the pulping machine.

[0019] In some embodiments, the main material feeder includes a rotary valve, the inner wall of the rotary valve is provided with a non-metallic protective layer, wherein the non-metallic protective layer includes silicon carbide material; the main material conveying pipeline is made of stainless steel material and the inner wall of the main material conveying pipeline is provided with an alumina ceramic ring.

[0020] In the technical solution of the embodiment of the present disclosure, a non-metallic protective layer is provided on the inner wall of the rotary valve, and an alumina ceramic ring is provided on the inner wall of the main material conveying pipeline. When the main material passes through the rotary valve and the main material conveying pipeline, the non-metallic protective layer isolates the main material from the metal material of the rotary valve, and the alumina ceramic ring isolates the main material from the metal material of the main material conveying pipeline. In this way, no new impurities will be added to the main material in the process of being filtered out by the first filter unit and then conveyed to the main material storage bin, thereby ensuring the purity of the main material in the main material storage bin and increasing the production qualification rate of the battery slurry.

[0021] In some embodiments, the first filtration unit includes an iron remover.

[0022] In the technical solution of the embodiment of the present disclosure, the iron remover is a structure that can generate a strong magnetic field attraction, which can remove magnetic impurities and metal impurities mixed in the main material to increase the purity of the main material.

[0023] In some embodiments, the auxiliary material loading system includes an auxiliary material feeder, an auxiliary material conveying pipeline, and an auxiliary material storage bin, and the filtering unit includes a second filtering unit. The auxiliary material feeder is used to convey the auxiliary material to the auxiliary material storage bin through the auxiliary material conveying pipeline, and the second filtering unit is arranged between the auxiliary material feeder and the auxiliary material conveying pipeline.

[0024] In the technical solution of the embodiment of the present disclosure, the second filtering unit is provided to filter the auxiliary material before the auxiliary material enters the auxiliary material conveying pipeline, thereby increasing the purity of the auxiliary material entering the auxiliary material conveying pipeline and the auxiliary material storage bin, and reducing the probability of impurities contained in the auxiliary material entering the auxiliary material conveying pipeline and the auxiliary material storage bin and affecting the purity of the auxiliary material, so that the auxiliary material has a higher purity during the conveying process, thereby increasing the qualified rate of the battery slurry prepared by the pulping machine.

[0025] In some embodiments, the auxiliary material feeder includes a suction gun, the outer surface of which is provided with a non-metallic protective layer, wherein the non-metallic protective layer includes Teflon material; the auxiliary material delivery pipeline is made of stainless steel material and the inner wall of the auxiliary material delivery pipeline is provided with a polyethylene sintered tube.

[0026] In the technical solution of the embodiment of the present disclosure, a non-metallic protective layer is provided on the outer surface of the suction gun, and a polyethylene sintered tube is provided on the inner wall of the auxiliary material conveying pipe. When the auxiliary material passes through the suction gun and the auxiliary material conveying pipe, the non-metallic protective layer separates the auxiliary material from the metal substance of the suction gun, and the polyethylene sintered tube separates the auxiliary material from the metal substance of the auxiliary material conveying pipe. In this way, no new impurities will be added to the auxiliary material in the process of being conveyed to the auxiliary material storage bin after the auxiliary material is filtered by the second filter unit, thereby ensuring the purity of the auxiliary material in the auxiliary material storage bin and increasing the production qualification rate of the battery slurry.

[0027] In some embodiments, the second filter unit includes a filter screen, and the filter screen is disposed on the suction gun.

[0028] In the technical solution of the embodiment of the present disclosure, the filter can remove particle agglomerates mixed in the auxiliary material to increase the purity of the auxiliary material. The filter is set on the suction gun, specifically, it can be set at the suction port of the suction gun to filter impurities in the auxiliary material during suction.

[0029] In some embodiments, the battery slurry production system includes a solvent feeding system for storing and transporting solvent, an output end of the solvent feeding system is connected to an input end of the pulping machine, and the solvent feeding system is provided with a third filtering unit.

[0030] In the technical solution of the embodiment of the present disclosure, before the solvent enters the pulping machine, the third filtering unit filters the impurities contained in the solvent, so that the impurity content of the solvent entering the pulping machine is low, so that the qualified rate of the battery slurry prepared by the pulping machine can also be higher, reducing the filtering pressure and filtering difficulty during the transportation of the downstream battery slurry, improving the qualified rate of the battery slurry, and increasing the safety performance of the battery.

[0031] In some embodiments, the solvent feeding system includes a solvent storage tank and a solvent feeder, the solvent feeder is used to transport the solvent to the solvent storage tank, and the third filter unit is disposed between the solvent storage tank and the solvent feeder.

[0032] In the technical solution of the embodiment of the present disclosure, the third filtering unit filters the impurities contained in the solvent itself before the solvent enters the solvent storage bin, thereby increasing the purity of the solvent entering the solvent storage bin, so that the solvent has a higher purity in the pulping machine, and increasing the qualified rate of the battery slurry prepared by the pulping machine.

[0033] In some embodiments, the third filter unit is a wound filter, and the precision of the wound filter is 0.22 μm to 75 μm.

[0034] In the technical solution of the embodiment of the present disclosure, when the solvent contacts the outer surface of the wound filter, the particulate impurities contained therein are blocked outside the wound filter, thereby increasing the purity of the solvent.

[0035] In some embodiments, the pulping machine includes a driving mechanism and a stirring mechanism, the driving mechanism is used to drive the stirring mechanism to rotate, the driving mechanism and the stirring mechanism are made of non-metallic materials, or the driving mechanism and the stirring mechanism are made of metal materials and are provided with a non-metallic protective layer, wherein the metal material includes an aluminum alloy material and the non-metallic protective layer includes a silicon carbide material.

[0036] In the technical solution of the disclosed embodiment, the drive mechanism and stirring mechanism are made of non-metallic materials, which can reduce the probability of metal impurities being included in the battery slurry production process, thereby ensuring a high pass rate for the produced battery slurry and reducing the filtration pressure in the downstream battery slurry transportation process. The drive mechanism and stirring mechanism are made of metal materials and are provided with a non-metallic protective layer. During the battery slurry production process, the non-metallic protective layer isolates the battery slurry from metal substances. In this way, no new impurities are added to the battery slurry after it is prepared in the pulping machine, and the pass rate of the battery slurry is high.

[0037] In some embodiments, the battery slurry production system includes a coating buffer tank, the outlet end of which is connected to a coating die head, the coating die head is used to coat the slurry for the battery pole pieces, and at least a fourth filtration unit is provided between the coating buffer tank and the pulping machine.

[0038] In the technical solution of the embodiment of the present disclosure, during the battery slurry transportation process, the fourth filtering unit filters the mixed particle agglomerates in the battery slurry to remove large particle impurities in the battery slurry, thereby increasing the qualified rate of the battery slurry. After the main material, auxiliary material and solvent are filtered, the filtration pressure of the battery slurry during the transportation process is low, and the transportation efficiency can also be increased.

[0039] In some embodiments, the fourth filter unit is a wound filter, and the precision of the wound filter is 100 μm to 150 μm.

[0040] In the technical solution of the embodiment of the present disclosure, when the battery slurry contacts the outer surface of the wound filter, the particulate impurities contained therein are blocked outside the wound filter, thereby increasing the purity of the solvent.

[0041] In some embodiments, the battery slurry production system includes a first transfer tank and a fifth filter unit, the first transfer tank is arranged between the fourth filter unit and the fifth filter unit, and the coating buffer tank is arranged downstream of the fifth filter unit along the battery slurry conveying direction.

[0042] In the technical solution of the embodiment of the present disclosure, the first transfer tank can increase the storage capacity of the battery slurry during the battery slurry transportation process, and the fifth filtering unit can further filter the impurities contained in the battery slurry again, thereby increasing the filtering effect of the battery slurry and thereby increasing the coating reliability.

[0043] In some embodiments, the battery slurry production system includes a second transfer tank and a sixth filter unit, the second transfer tank is arranged between the fifth filter unit and the sixth filter unit, and the coating buffer tank is connected to the outlet end of the sixth filter unit.

[0044] In the technical solution of the embodiment of the present disclosure, the second transfer tank can increase the storage capacity of the battery slurry during the battery slurry transportation process, and the sixth filtering unit can remove impurities from the battery slurry again. That is to say, during the transportation of the battery slurry, the battery slurry is filtered at least three times, and the purity of the battery slurry is high, which increases the safety performance of the battery.

[0045] In some embodiments, the fifth filter unit includes an iron remover; and / or the sixth filter unit includes an iron remover.

[0046] In the technical solution of the embodiment of the present disclosure, before the battery slurry is transported to the coating buffer tank, the fifth filter unit and the sixth filter unit filter the magnetic impurities and metal impurities that may be mixed in the battery slurry, so that the battery slurry entering the coating buffer tank contains no or almost no impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0048] FIG1 is a schematic structural diagram of a battery slurry production system provided in some embodiments of the present disclosure.

[0049] Explanation of the accompanying drawings: 100 - battery slurry production system; 1 - main material feeding system; 10 - main material feeder; 11 - main material conveying pipeline; 12 - main material storage bin; 2 - auxiliary material feeding system; 20 - auxiliary material feeder; 21 - auxiliary material conveying pipeline; 22 - auxiliary material storage bin; 3 - solvent feeding system; 30 - solvent feeder; 31 - solvent storage bin; 40 - mixing bin; 50 - pulping machine; 60 - coating buffer tank; 61 - first transfer tank; 62 - second transfer tank; 7 - filtering unit; 70 - first filtering unit; 71 - second filtering unit; 72 - third filtering unit; 73 - fourth filtering unit; 74 - fifth filtering unit; 75 - sixth filtering unit. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this disclosure; the terms "including" and "having" and any variations thereof herein are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0053] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0056] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0057] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0058] Hereinafter, the present disclosure will be described in detail.

[0059] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0060] A battery includes multiple battery cells, which are connected in series, parallel, or in a hybrid manner. Hybrid means that multiple battery cells are connected both in series and in parallel. A battery cell is the smallest independent unit that can be charged and discharged independently. A battery cell can be a secondary battery, which is a battery cell that can be recharged to activate the active material after discharge and continue to be used. The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., but the embodiments of the present disclosure are not limited to this.

[0061] A battery cell consists of an electrode sheet, a separator, and an electrolyte. The electrode sheet includes a current collector and an active material layer coated on the current collector surface. The active material layer is formed by drying an active material slurry. The active material slurry consists of powdered active material, a solvent, a binder, and other materials, which are uniformly mixed to form the active material slurry. Battery slurry can be produced and transported using a battery slurry production system.

[0062] Understandably, battery active materials are mostly obtained through mineral purification, and their preparation utilizes a sintering process, which inevitably introduces some magnetic impurities. Furthermore, during the production of battery slurry, wear on the slurry machine and friction between equipment components can introduce magnetic and metallic impurities into the slurry, potentially causing excessive battery self-discharge, short circuits, and subsequent safety issues, impacting battery performance. Furthermore, the production of battery slurry inevitably generates bubbles and particle agglomerates, which, when applied to electrode plates, can cause impurity particles, scratches, leaks, and stripping on the electrode surfaces, impacting battery safety performance.

[0063] The battery slurry production system used in the related art is equipped with multiple filtering devices during the transportation process from the completion of battery slurry manufacturing to the coating die head to filter out large particle impurities and metal impurities in the battery slurry to obtain qualified battery slurry.

[0064] However, the inventors of the present disclosure have noticed that in the battery slurry production system used in the related art, the filtration of the battery slurry is all concentrated in the transportation stage, which results in high filtration pressure and great difficulty.

[0065] Based on the above considerations, in order to reduce the filtering pressure during the battery slurry transportation stage and increase the qualified rate of the battery slurry, an embodiment of the present disclosure provides a battery slurry production system 100.

[0066] Please refer to FIG. 1 , a battery slurry production system 100 includes a main material feeding system 1 , an auxiliary material feeding system 2 , a mixing bin 40 and a slurry making machine 50 .

[0067] The main material feeding system 1 is used for storing and conveying the main material, wherein the main material includes active materials, and the active materials are battery positive electrode active materials or battery negative electrode active materials.

[0068] The auxiliary material feeding system 2 is used to store and transport auxiliary materials, wherein the auxiliary materials include adhesives and conductive agents.

[0069] The input end of the mixing bin 40 is connected to the output end of the main material feeding system 1 and the output end of the auxiliary material feeding system 2 respectively, and is used to receive the main material and the auxiliary material, and mix the mixture of the main material and the auxiliary material.

[0070] The input end of the pulping machine 50 is connected to the output end of the mixing chamber 40, and is used to generate battery slurry from the mixture of the main material and the auxiliary material and the solvent.

[0071] Wherein, at least one of the main material feeding system 1 and the auxiliary material feeding system 2 is provided with a filtering unit 7 .

[0072] The main material refers to the powdered material that makes up the majority of the battery slurry. The positive electrode active material has a high inherent potential, while the negative electrode active material has a low inherent potential. This creates a large potential difference between the two, resulting in a battery cell with a high energy density. The positive electrode active material can be one or more lithium transition metal oxides, such as lithium cobalt oxide and lithium iron phosphate. The negative electrode active material can be one or more carbon materials, such as graphite, coke, carbon fiber, and carbon black.

[0073] The main ingredient can be contained in a main ingredient powder bag, which is unpacked, stored, and transported to the mixing bin 40 by the main ingredient loading system 1. The main ingredient powder bag is a bulk container for the main ingredient to be transported. The bulk container can be a ton bag, which can also be called a container bag or a woven bag. The ton bag can be made of polypropylene fiber, which has the characteristics of high strength, wear resistance, waterproof and moisture-proof, and easy loading and unloading. The ton bag can be in the shape of a rectangular parallelepiped. When the main ingredient needs to be unloaded, one or more openings can be provided on the surface of the ton bag to facilitate the unloading of the main ingredient.

[0074] The main ingredient loading system 1 can automatically remove the main ingredient powder bag and convey the main ingredient, that is, the main ingredient powder bag does not need to be opened manually, so as to improve the degree of automation of unpacking the main ingredient powder bag, increase the unpacking efficiency, reduce the manpower consumption of unpacking the main ingredient powder bag, and reduce the chance of workers directly contacting the main ingredient during the operation and affecting their health.

[0075] Exemplarily, the main material feeding system 1 may include a suspension component and an unpacking component. Workers only need to hang the main material powder bag on the suspension component, and the suspension component will transport the main material powder bag to a preset position. The unpacking component is used to destroy the main material powder bag at the preset position. In this way, there is no need to manually remove the main material powder bag.

[0076] Auxiliary materials refer to powdered materials that account for a relatively small proportion in the battery slurry. Binders are used to bond and maintain the positive active material and negative active material of the battery, increase the contact between the positive active material, negative active material and the conductive agent, and increase the electronic contact between the positive active material, negative active material and the current collector. Conductive agents are used to improve the conductivity and charge and discharge performance of the battery, and improve the safety and cycle life of the battery. The binder can be one or more of polyvinyl alcohol binder, polyacrylate binder, epoxy resin binder or vinyl acetate resin binder. The conductive agent can be one or more of conductive carbon black, superconducting carbon black, graphite conductive agent, carbon powder, etc.

[0077] The auxiliary material can be contained in the auxiliary material powder bag, which is unpacked, stored and transported to the mixing bin 40 by the auxiliary material feeding system 2. The shape and unpacking method of the auxiliary material powder bag can refer to the description of the main material powder bag above, and will not be repeated here.

[0078] The mixing bin 40 is used to mix the main material and the auxiliary material so that the main material and the auxiliary material can be evenly distributed in the mixing bin 40. When the pulping machine 50 receives the mixture of the main material and the auxiliary material, the main material and the auxiliary material can also be evenly distributed in the pulping machine 50, thereby increasing the pulping efficiency of the pulping machine 50.

[0079] Illustratively, the battery slurry production system 100 may include a mixing mechanism, which is disposed in the mixing bin 40 to mix the main material and the auxiliary material in the mixing bin 40. Specifically, the mixing mechanism is a mechanism capable of mixing the main material and the auxiliary material in the mixing bin 40 so that the main material and the auxiliary material are evenly distributed. The mixing mechanism may include a stirring device that is at least partially disposed in the mixing bin 40. The stirring device may stir the main material and the auxiliary material in the mixing bin 40 by self-rotation, break up lumps formed by the deposition of the main material and the auxiliary material, and mix the main material and the auxiliary material evenly. The stirring device may include a stirring paddle, a stirring rod, etc. Of course, in other examples, the mixing mechanism may also include a rotating mechanism disposed outside the mixing bin 40, which drives the mixing bin 40 to rotate, so that the main material and the auxiliary material in the mixing bin 40 are evenly mixed under the action of rotation.

[0080] Of course, the mixing mechanism may also include a vibrator and an air butterfly to generate vibration so that the main material and the auxiliary material in the mixing chamber 40 are fully mixed.

[0081] Of course, the battery slurry production system 100 may also include a scale and a pressure sensor, which are disposed in the mixing chamber 40 to monitor the weight of the mixture of the main material and the auxiliary material, so as to keep the difference between the weight of the mixture of the main material and the auxiliary material and the target weight within a reasonable range to facilitate slurry production. The target weight refers to the sum of the weights of the main material and the auxiliary material that the mixing chamber 40 needs to provide to the pulping machine 50 in a single batch.

[0082] The pulping machine 50 is used to stir the mixture of the main material and the auxiliary material with the solvent to obtain battery slurry.

[0083] The solvent may be one or more of water and an organic solvent. For example, the solvent may be one or more of water, a heterocyclic compound, and a ketone compound.

[0084] The filter unit 7 refers to a structure that can filter magnetic impurities, metal impurities, and particle agglomerates.

[0085] At least one of the main material feeding system 1 and the auxiliary material feeding system 2 is provided with a filtering unit 7, which includes three situations.

[0086] The first type: the main material feeding system 1 is provided with a filtering unit 7. The filtering unit 7 filters the impurities mixed in the main material during transportation, so that the impurities of the main material entering the mixing chamber 40 are reduced, reducing the impact of the impurities of the main material itself on the quality of the battery slurry, thereby reducing the content of magnetic impurities, metal impurities or particle agglomerates in the battery slurry prepared by the pulping machine 50, reducing the filtering pressure during the battery slurry transportation process, further improving the filtering effect of the battery slurry, and increasing the production quality of the battery slurry, thereby reducing the safety performance of the battery.

[0087] The second type: the auxiliary material feeding system 2 is provided with a filtering unit 7. The filtering unit 7 filters the impurities mixed in the auxiliary material during transportation, so that the impurities in the auxiliary material entering the mixing chamber 40 are reduced, reducing the impact of the impurities in the auxiliary material itself on the quality of the battery slurry, thereby reducing the content of magnetic impurities, metal impurities or particle agglomerates in the battery slurry prepared by the pulping machine 50, reducing the filtering pressure during the battery slurry transportation process, further improving the filtering effect of the battery slurry, and increasing the production quality of the battery slurry, thereby reducing the safety performance of the battery.

[0088] The third type: Both the main material feeding system 1 and the auxiliary material feeding system 2 are provided with a filtering unit 7. The filtering unit 7 filters the metal impurities, magnetic impurities and particle agglomerates contained in the main material and auxiliary material during transportation, so that the main material and auxiliary material entering the mixing chamber 40 have fewer impurities, reducing the impact of the impurities of the main material and auxiliary material themselves on the qualification of the battery slurry, further reducing the content of magnetic impurities, metal impurities or particle agglomerates in the battery slurry prepared by the pulping machine 50, reducing the filtering pressure during the battery slurry transportation process, further improving the filtering effect of the battery slurry, and increasing the production qualification rate of the battery slurry, thereby improving the safety performance of the battery.

[0089] The battery slurry production system 100 provided in the embodiment of the present disclosure is configured with a filtering unit 7 in at least one of the main material feeding system 1 and the auxiliary material feeding system 2. Before entering the mixing bin 40, the filtering unit 7 filters impurities entrained during the transportation of the main material and / or auxiliary material, so that the impurity content of the main material and / or auxiliary material entering the pulping machine 50 is low, thereby increasing the qualified rate of the battery slurry prepared by the pulping machine 50, reducing the filtering pressure and difficulty of the downstream battery slurry during transportation, improving the qualified rate of the battery slurry, and increasing the safety performance of the battery.

[0090] In some embodiments, the main material feeding system 1 includes a main material feeder 10, a main material conveying pipeline 11, and a main material storage bin 12. The filter unit 7 includes a first filter unit 70. The main material feeder 10 is used to convey the main material to the main material storage bin 12 through the main material conveying pipeline 11. The first filter unit 70 is arranged between the main material feeder 10 and the main material conveying pipeline 11.

[0091] Specifically, after the main material powder bag is removed, the main material in the main material powder bag can be transported to the main material storage bin 12 for storage through the main material feeder 10 and the main material conveying pipe 11. The first filter unit 70 filters the impurities contained in the main material itself before the main material enters the main material conveying pipe 11, so that the impurity content of the main material entering the main material storage bin 12 is low.

[0092] In this embodiment, the first filtering unit 70 is provided to filter the main material before the main material enters the main material conveying pipeline 11, thereby increasing the purity of the main material entering the main material conveying pipeline 11 and the main material storage bin 12, and reducing the probability of impurities mixed with the main material entering the main material conveying pipeline 11 and the main material storage bin 12 and affecting the purity of the main material, so that the main material has a higher purity during the conveying process, thereby increasing the qualified rate of the battery slurry prepared by the pulping machine 50.

[0093] Of course, in other embodiments, the first filtering unit 70 may also be disposed between the main material storage bin 12 and the main material delivery pipeline 11, or between the main material storage bin 12 and the mixing bin 40. In still other embodiments, at least two of the following: between the main material feeder 10 and the main material delivery pipeline 11, between the main material storage bin 12 and the main material delivery pipeline 11, and between the main material storage bin 12 and the mixing bin 40 may be provided with a filtering structure to further improve the purity of the main material.

[0094] It is understandable that the method for the main material to enter the main material storage bin 12 through the main material conveying pipeline 11 is not limited.

[0095] For example, the main material feeding system 1 may include a fan, which is used to generate negative pressure in the main material conveying pipeline 11 so that the main material enters the main material storage bin 12 under the action of negative pressure. The fan may be a Roots blower or other structure that can generate negative pressure.

[0096] The specific structure of the main material feeder 10 is not limited.

[0097] In some embodiments, the main material feeder 10 includes a rotary valve, the inner wall of which is provided with a non-metallic protective layer, wherein the non-metallic protective layer includes silicon carbide material; the main material conveying pipeline 11 is made of stainless steel material and the inner wall of the main material conveying pipeline 11 is provided with an alumina ceramic ring.

[0098] Specifically, the rotary valve is a structure that conveys the main material into the main material delivery pipeline 11 via a rotating component. The non-metallic protective layer is a structure devoid of metallic properties. The rotary valve can be made of metal, and the non-metallic protective layer is provided on the inner wall of the rotary valve. This non-metallic protective layer effectively isolates the main material from the metal components of the rotary valve. Silicon carbide has excellent wear resistance and high thermal conductivity, and it resists damage from collisions and friction with the main material, thereby reducing the likelihood of contact between the main material and the metal components of the rotary valve.

[0099] Of course, the non-metallic protective layer may also include other non-metallic materials, which is not limited here.

[0100] Exemplarily, the rotary valve may include a valve body and an impeller disposed in the valve body. The impeller rotates in the valve body to convey the main material to the main material conveying pipeline 11. The inner wall of the valve body and the impeller may be provided with a non-metallic protective layer.

[0101] The stainless steel material used for the main material delivery pipe 11 can be 304 stainless steel or other types of stainless steel. Of course, the main material delivery pipe 11 can also be made of other metal materials. The alumina ceramic ring has a structure without metallic properties and can isolate the main material from the metal material of the main material delivery pipe 11. The alumina ceramic ring has high hardness and good wear resistance. It can survive collision and friction with the main material and will not be damaged, thereby reducing the probability of the main material coming into contact with the metal material of the main material delivery pipe 11.

[0102] Of course, the inner wall of the main material conveying pipe 11 may also be provided with other non-metallic structures, which is not limited here.

[0103] It is understandable that when the rotary valve and the main material delivery pipeline 11 are feeding, the powder in the rotary valve will inevitably produce friction and collision with the rotary valve and the main material delivery pipeline 11. In the related art, the rotary valve and the main material delivery pipeline 11 are made of metal materials, which inevitably contain some active metals such as iron, chromium, nickel, copper, zinc, etc., and thus the main material is mixed with metal impurities after passing through the rotary valve and the main material delivery pipeline 11, affecting the qualified rate of the battery slurry.

[0104] In this embodiment, a non-metallic protective layer is provided on the inner wall of the rotary valve, and an alumina ceramic ring is provided on the inner wall of the main material delivery pipe 11. When the main material passes through the rotary valve and the main material delivery pipe 11, the non-metallic protective layer separates the main material from the metal material of the rotary valve, and the alumina ceramic ring separates the main material from the metal material of the main material delivery pipe 11. In this way, no new impurities will be added to the main material during the process of being filtered out by the first filter unit 70 and then transported to the main material storage bin 12, thereby ensuring the purity of the main material in the main material storage bin 12 and increasing the production qualification rate of the battery slurry.

[0105] It is understandable that in some examples, the inner wall of the main material storage bin 12 is also provided with a non-metallic protective layer to further ensure the purity of the main material.

[0106] The specific structure of the first filter unit 70 is not limited.

[0107] In some embodiments, the first filter unit 70 includes an iron remover.

[0108] The iron remover is a structure that can generate a strong magnetic field attraction, which can remove magnetic impurities and metal impurities mixed in the main material to increase the purity of the main material.

[0109] In some embodiments, the auxiliary material loading system 2 includes an auxiliary material feeder 20, an auxiliary material conveying pipeline 21, and an auxiliary material storage bin 22. The filter unit 7 includes a second filter unit 71. The auxiliary material feeder 20 is used to convey the auxiliary material to the auxiliary material storage bin 22 through the auxiliary material conveying pipeline 21. The second filter unit 71 is arranged between the auxiliary material feeder 20 and the auxiliary material conveying pipeline 21.

[0110] Specifically, after the auxiliary material powder bag is removed, the auxiliary material in the auxiliary material powder bag can be transported to the auxiliary material storage bin 22 for storage through the auxiliary material feeder 20 and the auxiliary material conveying pipe 21. The second filter unit 71 filters the impurities contained in the auxiliary material itself before the auxiliary material enters the auxiliary material conveying pipe 21, so that the impurity content of the auxiliary material entering the auxiliary material storage bin 22 is low.

[0111] In this embodiment, the second filtering unit 71 is provided to filter the auxiliary material before the auxiliary material enters the auxiliary material conveying pipe 21, thereby increasing the purity of the auxiliary material entering the auxiliary material conveying pipe 21 and the auxiliary material storage bin 22, and reducing the probability of impurities contained in the auxiliary material entering the auxiliary material conveying pipe 21 and the auxiliary material storage bin 22 and affecting the purity of the auxiliary material, so that the auxiliary material has a higher purity during the conveying process, thereby increasing the qualified rate of the battery slurry prepared by the pulping machine 50.

[0112] Of course, in other embodiments, the second filtering unit 71 may also be disposed between the auxiliary material storage bin 22 and the auxiliary material delivery pipeline 21, or between the auxiliary material storage bin 22 and the mixing bin 40. In still other embodiments, at least two of the following: between the auxiliary material feeder 20 and the auxiliary material delivery pipeline 21, between the auxiliary material storage bin 22 and the auxiliary material delivery pipeline 21, and between the auxiliary material storage bin 22 and the mixing bin 40 may be provided with a structure having a filtering function to further improve the purity of the auxiliary material.

[0113] The specific structure of the auxiliary material feeder 20 is not limited.

[0114] In some embodiments, the auxiliary material feeder 20 includes a suction gun, the outer surface of which is provided with a non-metallic protective layer, wherein the non-metallic protective layer includes Teflon material; the auxiliary material conveying pipeline 21 is made of stainless steel material and the inner wall of the auxiliary material conveying pipeline 21 is provided with a polyethylene sintered tube.

[0115] Specifically, the suction gun utilizes vacuum suction to draw the auxiliary material into the auxiliary material delivery pipe 21. The non-metallic protective layer is a structure devoid of metallic properties. The outer wall of the suction gun can be made of a metal material. This non-metallic protective layer isolates the auxiliary material from the metal material of the suction gun. Teflon is a wear-resistant and impermeable material, resisting damage from collisions and friction with the auxiliary material, thereby reducing the likelihood of contact between the auxiliary material and the metal material of the suction gun.

[0116] Of course, the non-metallic protective layer may also include other non-metallic materials, which is not limited here.

[0117] The stainless steel material used for the auxiliary material delivery pipe 21 can be 304 stainless steel or other stainless steel materials. Of course, the auxiliary material delivery pipe 21 can also be made of other metal materials. The polyethylene sintered tube can isolate the auxiliary material from the metal materials in the auxiliary material delivery pipe 21. In addition, the polyethylene sintered tube itself has micropores. By continuously passing air between the auxiliary material delivery pipe 21 and the polyethylene sintered tube, an air film is formed on the surface of the polyethylene sintered tube. This facilitates the flow of the auxiliary material in the auxiliary material delivery pipe 21, reduces friction, and reduces the probability of the auxiliary material coming into contact with the metal materials in the auxiliary material delivery pipe 21.

[0118] Of course, the inner wall of the auxiliary material delivery pipe 21 may also be provided with other non-metallic structures, which is not limited here.

[0119] It can be understood that when the suction gun and the auxiliary material conveying pipe 21 are feeding, the suction gun is inserted into the auxiliary material powder bag, and the suction port of the suction gun is tightly surrounded by powder, and the auxiliary material is sucked into the auxiliary material conveying pipe 21 by negative pressure. In this process, the outer surface of the suction gun and the auxiliary material conveying pipe 21 will inevitably produce friction and collision with the auxiliary material, and in the related art, the outer wall of the suction gun and the auxiliary material conveying pipe 21 are made of metal materials, which inevitably contain some active metals, such as iron, chromium, nickel, copper, zinc, etc., which will cause the auxiliary material to be mixed with metal impurities after passing through the suction gun and the auxiliary material conveying pipe 21, affecting the qualified rate of the battery slurry.

[0120] In this embodiment, a non-metallic protective layer is provided on the outer surface of the suction gun, and a polyethylene sintered tube is provided on the inner wall of the auxiliary material conveying pipe 21. When the auxiliary material passes through the suction gun and the auxiliary material conveying pipe 21, the non-metallic protective layer separates the auxiliary material from the metal material of the suction gun, and the polyethylene sintered tube separates the auxiliary material from the metal material of the auxiliary material conveying pipe 21. In this way, no new impurities will be added to the auxiliary material in the process of being filtered out by the second filter unit 71 and then conveyed to the auxiliary material storage bin 22, thereby ensuring the purity of the auxiliary material in the auxiliary material storage bin 22 and increasing the production qualification rate of the battery slurry.

[0121] It is understandable that in some examples, the inner wall of the auxiliary material storage bin 22 is also provided with a non-metallic protective layer to further ensure the purity of the auxiliary material.

[0122] The specific structure of the second filter unit 71 is not limited.

[0123] In some embodiments, the second filter unit 71 includes a filter screen, which is disposed on the suction gun.

[0124] The filter can remove the particle agglomerates mixed in the auxiliary materials to increase the purity of the auxiliary materials. The filter is set on the suction gun, specifically, it can be set at the suction port of the suction gun to filter out impurities in the auxiliary materials when sucking the materials.

[0125] The filter screen may be provided with a plurality of filter screen holes, which may be circular holes, square holes or other shapes. For example, the diameter of the circular hole may be 10 mm, the length of the square hole may be 10 mm, and the width may be 10 mm.

[0126] In some embodiments, the battery slurry production system 100 includes a solvent feeding system 3 for storing and transporting solvent. The output end of the solvent feeding system 3 is connected to the input end of the pulping machine 50 . The solvent feeding system 3 is provided with a third filtering unit 72 .

[0127] Specifically, the solvent enters the pulping machine 50 through the solvent feeding system 3 , meets the mixture of the main material and the auxiliary material in the pulping machine 50 , and is mixed under the action of the pulping machine 50 to form battery slurry.

[0128] It is understandable that the solvent will inevitably contain impurities during storage or preparation, which will affect the qualified rate of the battery slurry after entering the pulping machine 50.

[0129] In this embodiment, before the solvent enters the pulping machine 50, the third filtering unit 72 filters the impurities contained in the solvent, so that the impurity content of the solvent entering the pulping machine 50 is low, so that the qualified rate of the battery slurry prepared by the pulping machine 50 can also be higher, reducing the filtering pressure and filtering difficulty during the transportation of the downstream battery slurry, improving the qualified rate of the battery slurry, and increasing the safety performance of the battery.

[0130] In some embodiments, referring to FIG. 1 , the solvent feeding system 3 includes a solvent storage bin 31 and a solvent feeder 30 . The solvent feeder 30 is used to deliver the solvent to the solvent storage bin 31 . The third filter unit 72 is disposed between the solvent storage bin 31 and the solvent feeder 30 .

[0131] In this embodiment, the third filtering unit 72 filters the impurities contained in the solvent itself before the solvent enters the solvent storage tank 31, thereby increasing the purity of the solvent entering the solvent storage tank 31, so that the solvent has a higher purity in the pulping machine 50, and increasing the qualified rate of the battery slurry prepared by the pulping machine 50.

[0132] The specific structure of the third filter unit 72 is not limited.

[0133] In some embodiments, the third filter unit 72 includes a wound filter.

[0134] The precision of the wound filter is 0.22μm to 75μm, for example, 0.22μm, 1μm, 5μm, 11μm, 19μm, 25μm, 30μm, 42μm, 48μm, 50μm, 57μm, 64μm, 75μm, etc.

[0135] The accuracy of a wound-type filter refers to the size of the largest particles allowed to pass through when a solvent containing impurities passes through the wound-type filter.

[0136] Specifically, when the solvent contacts the outer surface of the wound filter, particulate impurities contained therein are blocked outside the wound filter, thereby increasing the purity of the solvent.

[0137] It can be understood that the accuracy of the wound filter can be selected according to the viscosity of the solvent. When the viscosity of the solvent is large, the fluidity of the solvent is poor, and a wound filter with a larger accuracy can be selected, such as a wound filter with an accuracy of 75μm; when the viscosity of the solvent is small, the fluidity of the solvent is good, and a wound filter with a smaller accuracy can be selected, such as a wound filter with an accuracy of 0.22μm.

[0138] In some embodiments, the pulping machine 50 includes a driving mechanism and a stirring mechanism. The driving mechanism is used to drive the stirring mechanism to rotate. The driving mechanism and the stirring mechanism are made of non-metallic materials.

[0139] Specifically, during the process of preparing the battery slurry, the driving mechanism drives the stirring mechanism to rotate, stirring the main material, auxiliary material and solvent in the pulping machine 50 to fully mix, infiltrate and disperse them, thereby forming the battery slurry.

[0140] The stirring mechanism may include stirring members such as a stirring rod and a stirring paddle.

[0141] It is understandable that during the preparation of battery slurry, the drive mechanism and stirring mechanism inevitably produce friction and collision with the battery slurry. In related art, the drive mechanism and stirring mechanism are made of metal materials, which inevitably contain some active metals such as iron, chromium, nickel, copper, and zinc. This causes the generated battery slurry to be mixed with metal impurities, affecting the battery slurry's pass rate.

[0142] In this embodiment, the driving mechanism and the stirring mechanism are made of non-metallic materials, which can reduce the probability of metal impurities being included in the battery slurry production process, so that the qualified rate of the produced battery slurry is high and the filtering pressure of the downstream battery slurry transportation process is reduced.

[0143] In other embodiments, the driving mechanism and the stirring mechanism are made of metal materials and are provided with a non-metallic protective layer, wherein the metal material includes an aluminum alloy material and the non-metallic protective layer includes a silicon carbide material.

[0144] In this embodiment, during the battery slurry production process, the non-metallic protective layer isolates the battery slurry from the metal material, so that no new impurities are added after the battery slurry is prepared in the slurry making machine 50, and the qualified rate of the battery slurry is high.

[0145] It is understandable that the driving mechanism may include a stator and a rotor, and the stator and the rotor may be made of metal materials and provided with a non-metallic protective layer.

[0146] The driving mechanism may further include a transmission belt, which may be made of rubber material and does not contain any metal material inside.

[0147] Of course, the inner wall of the pulping machine 50 may also be made of metal material and provided with a non-metallic protective layer, so that the part of the pulping machine 50 that is in direct contact with the battery slurry does not contain any metal substances.

[0148] In some embodiments, the battery slurry production system 100 includes a coating buffer tank 60, the outlet end of the coating buffer tank 60 is connected to a coating die head, the coating die head is used to coat the slurry for the battery pole piece, and at least a fourth filter unit 73 is provided between the coating buffer tank 60 and the pulping machine 50.

[0149] In this embodiment, during the battery slurry transportation process, the fourth filtering unit 73 filters the mixed particle agglomerates in the battery slurry to remove large particle impurities in the battery slurry, thereby increasing the qualified rate of the battery slurry. After the main material, auxiliary material, and solvent are filtered, the filtration pressure of the battery slurry during transportation is low, and the transportation efficiency can also be increased.

[0150] In some embodiments, the fourth filter unit 73 is a wound filter.

[0151] The precision of the wound filter is 100μm to 150μm, for example, 100μm, 105μm, 110μm, 114μm, 120μm, 123μm, 129μm, 131μm, 137μm, 140μm, 145μm, 150μm, etc.

[0152] The accuracy of a wound-type filter refers to the size of the largest particles allowed to pass through the filter when the solvent containing impurities passes through the filter.

[0153] Specifically, when the battery slurry contacts the outer surface of the wound filter, particulate impurities contained therein are blocked outside the wound filter, thereby increasing the purity of the solvent.

[0154] In some embodiments, the battery slurry production system 100 includes a first transfer tank 61 and a fifth filter unit 74, the first transfer tank 61 is arranged between the fourth filter unit 73 and the fifth filter unit 74, and the coating buffer tank 60 is arranged downstream of the fifth filter unit 74 along the battery slurry conveying direction.

[0155] In this embodiment, the first transfer tank 61 can increase the storage capacity of the battery slurry during the battery slurry transportation process, and the fifth filtering unit 74 can further filter the impurities contained in the battery slurry again, thereby increasing the filtering effect of the battery slurry and thereby increasing the coating reliability.

[0156] In some embodiments, the battery slurry production system 100 includes a second transfer tank 62 and a sixth filter unit 75 , the second transfer tank 62 is arranged between the fifth filter unit 74 and the sixth filter unit 75 , and the coating buffer tank 60 is connected to the outlet end of the sixth filter unit 75 .

[0157] In this embodiment, the second transfer tank 62 can increase the storage capacity of the battery slurry during the battery slurry transportation process, and the sixth filter unit 75 can remove impurities from the battery slurry again. That is to say, during the transportation of the battery slurry, the battery slurry is filtered at least three times, and the purity of the battery slurry is high, which increases the safety performance of the battery.

[0158] The specific structures of the fifth filter unit 74 and the sixth filter unit 75 are not limited.

[0159] In some embodiments, the fifth filter unit 74 includes an iron remover; and / or the sixth filter unit 75 includes an iron remover.

[0160] Before the battery slurry is transported to the coating buffer tank 60 , the fifth filter unit 74 and the sixth filter unit 75 filter magnetic impurities and metal impurities that may be mixed in the battery slurry, so that the battery slurry entering the coating buffer tank 60 contains no or almost no impurities.

[0161] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present disclosure. Industrial Applicability

[0162] In the battery slurry production system provided by the embodiment of the present disclosure, the filtration unit filters impurities contained in the production process of the main material and / or auxiliary material before entering the mixing bin, so that the impurity content of the main material and / or auxiliary material entering the pulping machine is low, so that the qualified rate of the battery slurry prepared by the pulping machine can also be higher, reducing the filtration pressure and filtration difficulty during the downstream battery slurry transportation, improving the qualified rate of the battery slurry, and increasing the safety performance of the battery.

Claims

1. A battery slurry production system, comprising: A main material feeding system, used for storing and conveying the main material, wherein the main material includes an active material, and the active material is a battery positive electrode active material or a battery negative electrode active material; An auxiliary material feeding system is used to store and transport auxiliary materials, wherein the auxiliary materials include a binder and a conductive agent; A mixing bin, the input end of which is connected to the output end of the main material feeding system and the output end of the auxiliary material feeding system, respectively, for receiving the main material and the auxiliary material and mixing the main material and the auxiliary material; A pulping machine, the input end of which is connected to the output end of the mixing bin, for generating battery slurry from a mixture of main materials and auxiliary materials and a solvent; Wherein, at least one of the main material feeding system and the auxiliary material feeding system is provided with a filtering unit.

2. The battery slurry production system according to claim 1, wherein: The main material feeding system includes a main material feeder, a main material conveying pipeline, and a main material storage bin. The filtering unit includes a first filtering unit. The main material feeder is used to convey the main material to the main material storage bin through the main material conveying pipeline. The first filtering unit is arranged between the main material feeder and the main material conveying pipeline.

3. The battery slurry production system according to claim 2, wherein: The main material feeder comprises a rotary valve, the inner wall of which is provided with a non-metallic protective layer, the main material delivery pipeline is made of stainless steel and the inner wall of which is provided with an alumina ceramic ring.

4. The battery slurry production system according to claim 3, wherein: The non-metallic protective layer is made of silicon carbide material.

5. The battery slurry production system according to any one of claims 2 to 4, wherein: The first filter unit includes an iron remover.

6. The battery slurry production system according to claim 1, wherein: The auxiliary material feeding system includes an auxiliary material feeder, an auxiliary material conveying pipeline, and an auxiliary material storage bin. The filtering unit includes a second filtering unit. The auxiliary material feeder is used to convey the auxiliary material to the auxiliary material storage bin through the auxiliary material conveying pipeline. The second filtering unit is arranged between the auxiliary material feeder and the auxiliary material conveying pipeline.

7. The battery slurry production system according to claim 6, wherein: The auxiliary material feeder includes a suction gun, the outer surface of which is provided with a non-metallic protective layer, the auxiliary material delivery pipeline is made of stainless steel and the inner wall of which is provided with a polyethylene sintered tube.

8. The battery slurry production system according to claim 7, wherein: The non-metallic protective layer is made of Teflon material.

9. The battery slurry production system according to claim 7, wherein: The second filter unit includes a filter screen, and the filter screen is arranged on the suction gun.

10. The battery slurry production system according to claim 1, wherein: The battery slurry production system includes a solvent feeding system, which is used to store and transport solvent. The output end of the solvent feeding system is connected to the input end of the pulping machine. The solvent feeding system is provided with a third filtering unit.

11. The battery slurry production system according to claim 10, wherein: The solvent feeding system includes a solvent storage bin and a solvent feeder. The solvent feeder is used to transport the solvent to the solvent storage bin. The third filter unit is arranged between the solvent storage bin and the solvent feeder.

12. The battery slurry production system according to any one of claims 10 to 11, wherein: The third filter unit includes a wound filter, and the precision of the wound filter is 0.22 μm to 75 μm.

13. The battery slurry production system according to claim 1, wherein: The pulping machine includes a driving mechanism and a stirring mechanism. The driving mechanism is used to drive the stirring mechanism to rotate. The driving mechanism and the stirring mechanism are made of non-metallic materials, or the driving mechanism and the stirring mechanism are made of metal materials and are provided with a non-metallic protective layer.

14. The battery slurry production system according to claim 13, wherein: The metal material is aluminum alloy, and the non-metallic protective layer is made of silicon carbide material.

15. The battery slurry production system according to any one of claims 1-4, 6-11, 13-14, wherein: The battery slurry production system includes a coating buffer tank, the outlet end of which is connected to a coating die head, which is used to coat slurry for the battery pole pieces. At least a fourth filtering unit is provided between the coating buffer tank and the pulping machine.

16. The battery slurry production system according to claim 15, wherein: The fourth filter unit is a wound filter, and the precision of the wound filter is 100 μm to 150 μm.

17. The battery slurry production system according to claim 15, wherein: The battery slurry production system includes a first transfer tank and a fifth filter unit. The first transfer tank is arranged between the fourth filter unit and the fifth filter unit. The coating buffer tank is arranged downstream of the fifth filter unit along the battery slurry conveying direction.

18. The battery slurry production system according to claim 17, wherein: The battery slurry production system includes a second transfer tank and a sixth filter unit. The second transfer tank is arranged between the fifth filter unit and the sixth filter unit. The coating buffer tank is connected to the outlet end of the sixth filter unit.

19. The battery slurry production system according to claim 18, wherein: The fifth filter unit includes an iron remover; and / or the sixth filter unit includes an iron remover.

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