Slurry conveying device, battery coating line, and slurry conveying method

Abstract

A slurry conveying device, a battery coating line, and a slurry conveying method. The slurry conveying device comprises: a main pipeline; a bypass pipeline, connected to the main pipeline; and a discharge pipeline which has one end connected to one end of the main pipeline and the other end used for outputting a slurry. The slurry conveying device has a slurry conveying state and a slurry circulating state; in the slurry conveying state, the main pipeline is not communicated with the bypass pipeline, but is communicated with the discharge pipeline, so as to convey the slurry from a feed pipeline; and in the slurry circulating state, the main pipeline is not communicated with the discharge pipeline, but is communicated with the bypass pipeline, so as to form a circulation loop for the slurry to circulate.

Description

Slurry conveying device, battery coating line and slurry conveying method

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410405805.8, filed on April 7, 2024, entitled “Slurry conveying device, battery coating line and slurry conveying method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of battery manufacturing, and particularly relates to a slurry conveying device, a battery coating line and a slurry conveying method. BACKGROUND

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

[0005] With the continuous development of battery manufacturing technology, how to reduce the manufacturing cost of the battery is one of the research topics in the industry.

[0006] SUMMARY

[0007] To solve the above technical problems, the present disclosure provides a slurry conveying device, a battery coating line and a slurry conveying method capable of reducing the manufacturing cost of the battery.

[0008] The present disclosure is achieved by the following technical solutions.

[0009] The first aspect of the present disclosure provides a slurry conveying device, comprising: a main pipeline; a bypass pipeline connected to the main pipeline; and a discharge pipeline connected to one end of the main pipeline and used for outputting slurry; wherein the slurry conveying device has a slurry conveying state and a slurry circulating state, in the slurry conveying state, the main pipeline and the bypass pipeline are not connected, the main pipeline and the discharge pipeline are connected to convey slurry conveyed from a feeding pipeline, in the slurry circulating state, the main pipeline and the discharge pipeline are not connected, the main pipeline and the bypass pipeline are connected to form a circulating loop for circulating slurry; the main pipeline comprises a first main channel and a second main channel, the first main channel has a first channel opening and a second channel opening, the second main channel has a third channel opening and a fourth channel opening, the first channel opening of the first main channel and the third channel opening of the second main channel are connected to the feeding pipeline respectively, the second channel opening of the first main channel and the fourth channel opening of the second main channel are connected to the discharge pipeline respectively, and a first valve is arranged between the first main channel and the second main channel, and the first valve is used for connecting or disconnecting the first main channel and the second main channel.

[0010] When conveying slurry is needed, the slurry conveying device is in the slurry conveying state, the main pipeline and the bypass pipeline are not connected, the main pipeline and the discharge pipeline are connected, and slurry conveyed from the feeding pipeline is conveyed; after conveying slurry is completed, the slurry conveying device is in the slurry circulating state, the main pipeline and the discharge pipeline are not connected, the main pipeline and the bypass pipeline are connected to form a circulating loop, and residual slurry in the main pipeline circulates in the circulating loop, so that the slurry in the main pipeline is in a flowing state, the probability of gelling due to static placement is reduced, the number of operations for removing gels is reduced, and thus the use cost of the slurry conveying device is reduced, and the use cost and the manufacturing cost of the slurry conveying device are both reduced, thereby reducing the manufacturing cost of the battery.

[0011] The specific structure of the main pipeline can make the main pipeline and the discharge pipeline connected to form a conveying pipeline, and the main pipeline and the bypass pipeline connected to form a circulating loop, thereby realizing switching between the conveying pipeline and the circulating loop. Moreover, the structure of the slurry conveying device is simple, the manufacturing cost is low, the slurry in the main pipeline is in a flowing state, the probability of gelling due to static placement is reduced, the number of operations for removing gels is reduced, and thus the use cost of the slurry conveying device is reduced, and the use cost and the manufacturing cost of the slurry conveying device are both reduced, thereby reducing the manufacturing cost of the battery.

[0012] In some embodiments, the main pipe comprises a pipe body and a partition plate arranged in the pipe body, the partition plate separates the passage in the pipe body into the first main passage and the second main passage, and the first valve is arranged on the partition plate.

[0013] The partition plate separates the passage in the pipe body into the first main passage and the second main passage, which reduces the number of pipes, saves cost, has compact structure, occupies small space, and the first valve is arranged on the partition plate, the opening and closing of the first valve can switch the state of the mutual communication and non-communication of the first main passage and the second main passage, which has simple structure and simple switching operation.

[0014] In some embodiments, the slurry conveying device further comprises a connecting piece connected to the main pipe, the discharge pipe and the bypass pipe respectively.

[0015] The connecting piece is arranged to realize the mutual connection among the main pipe, the discharge pipe and the bypass pipe, so that the main pipe can communicate with the discharge pipe to form a conveying pipe. Moreover, the slurry conveying device has simple structure and low manufacturing cost, the slurry in the main pipe is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gelation, thereby reducing the use cost of the slurry conveying device, i.e., both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0016] In some embodiments, the connecting piece has a first port, a second port, a third port, a fourth port and a fifth port, the first port is connected to the second passage opening of the first main passage, the second port is connected to the fourth passage opening of the second main passage, the third port and the fourth port are respectively connected to two ends of the bypass pipe, and the fifth port is connected to the discharge pipe.

[0017] In this way, the first main passage, the second main passage, the discharge pipe and the bypass pipe are connected to each other, so that the first main passage and the second main passage can communicate with the discharge pipe to form a conveying pipe, or communicate with the bypass pipe to form a circulation loop, thereby realizing the switching of the conveying pipe and the circulation loop. Moreover, the slurry conveying device has simple structure and low manufacturing cost, the slurry in the main pipe is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gelation, thereby reducing the use cost of the slurry conveying device, i.e., both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0018] In some embodiments, the first port is in communication with the third port and the fifth port, the second port is in communication with the fourth port and the fifth port, the first port and the second port are not in communication, and the third port and the fourth port are not in communication.

[0019] In this way, by limiting the communication state between the ports of the connecting piece, the first main channel and the second main channel can be respectively in communication with the discharge pipeline to form a conveying pipeline, or respectively in communication with both ends of the bypass pipeline to form a circulation loop, so as to realize the switching of the conveying pipeline and the circulation loop. Moreover, the slurry conveying device has a simple structure and low manufacturing cost, the slurry in the main pipeline is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device, i.e., both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0020] In some embodiments, the first port and the second port are arranged at the same end of the connecting piece.

[0021] In this way, the first port and the second port can be directly connected with the first main channel and the second main channel in the same pipe body respectively, which simplifies the connection structure and further reduces the manufacturing cost.

[0022] In some embodiments, an end of the partition plate away from the connecting piece is formed with a through hole, and the first valve is installed in the through hole. In the slurry conveying state, the first valve is adjusted to a closed state to make the first main channel and the second main channel not in communication with each other, and in the slurry circulation state, the first valve is adjusted to an open state to make the first main channel and the second main channel in communication with each other.

[0023] The first valve adjusts the state of the first main channel and the second main channel being in communication or not in communication with each other by opening or closing, to switch the conveying circuit and the circulation loop. The first valve is arranged at the end of the partition plate away from the connecting piece, so that the slurry flows a relatively long distance in the first main channel and the second main channel, so that the slurry is in a relatively fast flowing state as much as possible, thereby better reducing the probability of gelation.

[0024] In some embodiments, the slurry conveying device further comprises a second valve installed at an end of the discharge pipeline close to the main pipeline. In the slurry conveying state, the second valve is adjusted to an open state to make the discharge pipeline and the main pipeline in communication, and in the slurry circulation state, the second valve is adjusted to a closed state to make the discharge pipeline and the main pipeline not in communication.

[0025] By the arrangement of the second valve, the adjustment of the connection or disconnection between the main pipeline and the discharge pipeline is realized, so that the main pipeline can be connected with the discharge pipeline to form a conveying pipeline, or connected with the bypass pipeline to form a circulation loop, thereby realizing the switching between the conveying pipeline and the circulation loop. Moreover, the slurry conveying device has a simple structure and low manufacturing cost, the slurry in the main pipeline is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device, i.e., both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0026] In some embodiments, an end of the discharge pipeline away from the main pipeline extends into the slurry tank, and in the slurry conveying state, the slurry conveyed from the inlet pipeline enters the slurry tank through the main pipeline and the discharge pipeline in sequence.

[0027] The slurry is conveyed into the slurry tank for use by the electrode sheet coating device for coating operation.

[0028] In some embodiments, the inlet pipeline is connected with a first pump, and in the slurry conveying state, the first pump drives the slurry to flow in the main pipeline and the discharge pipeline; the bypass pipeline is connected with a second pump, and in the slurry circulation state, the second pump drives the slurry in the circulation loop to circulate in the circulation loop.

[0029] The first pump provides power for the conveying of the slurry, and the second pump provides power for the circulation of the slurry in the circulation loop, realizing the flow of the slurry in the two states, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device. Moreover, the slurry conveying device has a simple structure and low manufacturing cost, i.e., both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0030] In some embodiments, the discharge pipeline extends along a vertical direction.

[0031] The discharge pipeline is arranged to extend along a vertical direction, so that the slurry in the discharge pipeline flows downward under the action of gravity, which is beneficial to saving the energy of the first pump, and in the slurry circulation state, the slurry in the discharge pipeline is less likely to settle on the inner wall of the discharge pipeline, thereby reducing the probability of gelation.

[0032] A second aspect of the present disclosure provides a battery coating line, comprising: a slurry preparation device for preparing slurry; the above-mentioned slurry conveying device; an electrode sheet coating device for coating the slurry on a current collector to become an electrode sheet; wherein the slurry conveying device is used to convey the slurry prepared by the slurry preparation device to the electrode sheet coating device.

[0033] Since the battery coating line includes the slurry delivery device, the battery coating line includes all the advantages of the slurry delivery device, and thus the use cost and manufacturing cost of the battery coating line are reduced, thereby reducing the manufacturing cost of the battery.

[0034] A third aspect of the present disclosure provides a slurry delivery method using a slurry delivery device, the slurry delivery device including a main pipe, a bypass pipe connected to the main pipe, and a discharge pipe having one end connected to one end of the main pipe and the other end for outputting slurry;

[0035] The slurry delivery method includes:

[0036] a slurry delivery step of making the main pipe and the bypass pipe non-communicative and making the main pipe and the discharge pipe communicative and delivering the slurry delivered from the inlet pipe;

[0037] a slurry circulation step of making the main pipe and the discharge pipe non-communicative and making the main pipe and the bypass pipe communicative and forming a circulation loop, and making the slurry circulate in the circulation loop,

[0038] The slurry circulation step is performed in a state where the slurry delivery step is stopped;

[0039] The main pipe includes a first main passage having a first passage port and a second passage port and a second main passage having a third passage port and a fourth passage port, the first passage port of the first main passage and the third passage port of the second main passage are respectively connected to the inlet pipe, the second passage port of the first main passage and the fourth passage port of the second main passage are respectively connected to the discharge pipe, and a first valve is provided between the first main passage and the second main passage, the first valve being used to make the first main passage and the second main passage communicative with or non-communicative with each other;

[0040] The slurry delivery step includes:

[0041] a delivery route communication step of making the first main passage and the second main passage communicative with the discharge pipe respectively, making the first main passage and the second main passage non-communicative with the bypass pipe, and making the first main passage and the second main passage non-communicative with each other by the first valve;

[0042] a slurry delivery driving step of making the slurry delivered from the inlet pipe be divided into two routes and enter the discharge pipe through the first main passage and the second main passage respectively;

[0043] The slurry circulation step includes:

[0044] The circulation route communication step is to make the first main channel and the second main channel communicate with the bypass pipeline respectively, and the first main channel and the second main channel are both not communicated with the discharge pipeline, and the first main channel and the second main channel are communicated with each other through the first valve;

[0045] The slurry circulation driving step is to make the slurry in the first main channel and the second main channel circulate through the first main channel, the second main channel and the bypass pipeline.

[0046] The first switching route is to make the main pipeline communicate with the discharge pipeline to form a conveying pipeline or communicate with the bypass pipeline to form a circulation loop, so as to switch the conveying pipeline and the circulation loop, and then make the slurry flow in the respective pipeline to realize the conveying or circulation of the slurry. In this way, the slurry in the main pipeline is in a flowing state, which can reduce the probability of gelation due to static and the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device. Moreover, the flow direction of the slurry can be changed by changing the communication state of the main pipeline with the bypass pipeline and the discharge pipeline, so as to realize the circulation of the residual slurry. Therefore, the structure of the slurry conveying device is relatively simple, the manufacturing cost of the slurry conveying device is low, that is, the use cost and the manufacturing cost of the slurry conveying device are both reduced, thereby reducing the manufacturing cost of the battery.

[0047] In some embodiments, the slurry conveying device further comprises a second valve, which is installed on the discharge pipeline close to one end of the main pipeline.

[0048] In the conveying route communication step, the second valve is adjusted to an open state, so that the first main channel and the second main channel are communicated with the discharge pipeline respectively,

[0049] In the circulation route communication step, the second valve is adjusted to a closed state, so that the first main channel and the second main channel are both not communicated with the discharge pipeline.

[0050] Through the adjustment of the second valve, the adjustment of the communication or non-communication of the main pipeline with the discharge pipeline is realized, so that the main pipeline can communicate with the discharge pipeline to form a conveying pipeline or communicate with the bypass pipeline to form a circulation loop, thereby realizing the switching of the conveying pipeline and the circulation loop.

[0051] In some embodiments, the inlet pipeline is connected with a first pump, and the bypass pipeline is connected with a second pump.

[0052] In the slurry conveying driving step, the first pump is started to drive the slurry conveyed from the inlet pipeline to be divided into two paths and enter the discharge pipeline through the first main channel and the second main channel respectively;

[0053] In the step of driving the slurry to circulate, the second pump is started to drive the slurry in the first main channel and the second main channel to flow through the first main channel, the second main channel and the bypass pipeline.

[0054] The first pump drives the slurry to flow in the delivery pipeline, and the second pump drives the slurry to circulate in the circulation loop, realizing the flow of the slurry in two states to reduce the probability of gelation due to static, reduce the number of operations for removing the gel, thereby reducing the use cost of the slurry delivery device, and the structure of the slurry delivery device is simple, and the manufacturing cost is low, that is, the use cost and the manufacturing cost of the slurry delivery device are reduced, thereby reducing the manufacturing cost of the battery.

[0055] Inventive Effects

[0056] According to the present disclosure, a slurry delivery device, a battery coating line and a slurry delivery method capable of reducing the manufacturing cost of the battery are provided. BRIEF DESCRIPTION OF DRAWINGS

[0057] 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 detailed description is made with reference to the accompanying drawings.

[0058] FIG. 1 is a schematic diagram of one structure of a slurry delivery device according to some embodiments of the present disclosure;

[0059] FIG. 2 is an enlarged view of A in FIG. 1;

[0060] FIG. 3 is a top view of the internal structure of a main pipeline according to some embodiments of the present disclosure;

[0061] FIG. 4 is a side view of a main pipeline according to some embodiments of the present disclosure;

[0062] FIG. 5 is a schematic diagram of another structure of a slurry delivery device according to some embodiments of the present disclosure;

[0063] FIG. 6 is a schematic diagram of a structure of a battery coating line according to some embodiments of the present disclosure;

[0064] FIG. 7 is a flowchart of a slurry delivery method according to some embodiments of the present disclosure;

[0065] FIG. 8 is another flowchart of a slurry delivery method according to some embodiments of the present disclosure.

[0066] 10 slurry conveying device; 20 slurry preparation device; 30 pole piece coating device; 1 main pipeline; 11 first main channel; 111 first channel port; 112 second channel port; 12 second main channel; 121 third channel port; 122 fourth channel port; 13 pipe body; 14 partition plate; 2 bypass pipeline; 3 discharge pipeline; 4 feeding pipeline; 51 first valve; 52 second valve; 53 third valve; 54 fourth valve; 55 fifth valve; 6 connecting piece; 61 first port; 62 second port; 63 third port; 64 fourth port; 65 fifth port; 7 slurry tank; 81 first pump; 82 second pump. DETAILED DESCRIPTION

[0067] The embodiments of the technical solutions of the present disclosure 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 disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0068] 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 this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "include" and "have" and any variations thereof in the specification and the above description of the drawings are intended to cover not exclusive inclusion.

[0069] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like 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 disclosure, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0070] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents the "or" relationship between the front and rear associated objects.

[0072] In the description of the embodiments of the present disclosure, the orientations or positional relationships indicated by the technical terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present disclosure and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, operate or be used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0073] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, 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 terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0074] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0075] In the following, the present disclosure will be described in detail.

[0076] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0077] In the embodiments of the present disclosure, the battery can be a battery monomer.

[0078] The battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0079] The battery monomer includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charging and discharging process of the battery monomer, active ions (such as lithium ions) are inserted and extracted between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0080] The preparation steps of the positive and negative electrode sheets include: dispersing active materials (such as oxides, graphite, etc.) of the positive and negative electrodes in a solvent by a slurry preparation device to form a slurry. These slurries usually contain active materials, conductive agents, binders, etc.; then, the prepared electrode slurry is coated onto a current collector (such as an aluminum foil or a copper foil) by a coating device.

[0081] In the above preparation steps, the slurry prepared by the slurry preparation device needs to be transported to the coating device by a slurry conveying device for coating use by the coating device, thereby completing the preparation process of the electrode sheets of the battery. The slurry of the battery is a solid-liquid mixture obtained by mixing and stirring a solvent, an active material, a conductive agent, an adhesive, a thickening agent, and other additives in a certain ratio. During the conveying process of the slurry by the slurry conveying device, once the slurry stops moving, the slurry is prone to gelation due to sedimentation.

[0082] The inventors of the present disclosure noticed that the existing slurry conveying devices mostly use a method of removing residual slurry in the pipeline to reduce the probability of slurry gelation in the pipeline, so as to facilitate the next normal use of the slurry conveying device. For example, one way of removing residues is to use a push ball connected with a scraper to move in the pipeline. During the movement of the push ball in the pipeline, the scraper removes the residual slurry in the pipeline to achieve cleaning of the pipeline. The slurry conveying device is provided with a power device for driving the movement of the push ball and related structures for loading and unloading the push ball, etc., making the structure of the slurry conveying device complex, resulting in high manufacturing cost of the slurry conveying device. Moreover, most parts of the pipeline need to pass through the push ball after a relatively long period of time when the slurry stops flowing. During this relatively long period of time, the residual slurry is prone to gelation, resulting in unclean cleaning of the pipeline, which requires more frequent disassembly and cleaning of the gelation, making the use cost of the slurry conveying device higher. Therefore, the inventors of the present disclosure noticed that reducing the manufacturing cost and use cost of the slurry conveying device can greatly reduce the production cost of the battery.

[0083] The inventors of the present disclosure found through research that, instead of the method of removing residual slurry, the method of circulating the residual slurry can make the residual slurry in a flowing state, which can well reduce the probability of slurry gelation in the pipeline and reduce the number of gelation removal operations, thereby reducing the use cost of the slurry conveying device. Moreover, the slurry conveying device using the residual slurry circulation method can change the flow direction of the slurry by changing the communication state of the pipeline, thereby achieving the circulation of the residual slurry. Therefore, the structure of such a slurry conveying device is relatively simple, the manufacturing cost of the slurry conveying device is low, that is, both the use cost and the manufacturing cost of the slurry conveying device are reduced, thereby reducing the manufacturing cost of the battery.

[0084] Based on such design concept, the inventors of the present disclosure design a slurry conveying device, which comprises a main pipeline, a bypass pipeline connected to the main pipeline, and a discharge pipeline, one end of the discharge pipeline is connected to one end of the main pipeline, and the other end is used to output slurry. The slurry conveying device has a slurry conveying state and a slurry circulating state. In the slurry conveying state, the main pipeline and the bypass pipeline are not connected, and the main pipeline and the discharge pipeline are connected to convey the slurry conveyed from the inlet pipeline. In the slurry circulating state, the main pipeline and the discharge pipeline are not connected, and the main pipeline and the bypass pipeline are connected to form a circulating loop for the slurry to flow in circulation.

[0085] When the slurry needs to be conveyed, the slurry conveying device is in the slurry conveying state, the main pipeline and the bypass pipeline are not connected, and the main pipeline and the discharge pipeline are connected to convey the slurry conveyed from the inlet pipeline. After the slurry conveying is completed, the slurry conveying device is in the slurry circulating state, the main pipeline and the discharge pipeline are not connected, and the main pipeline and the bypass pipeline are connected to form a circulating loop, so that the residual slurry in the slurry conveying device flows in circulation in the circulating loop. In this way, the slurry in the main pipeline is in a flowing state, which can reduce the probability of gelation due to static placement and reduce the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device. Moreover, by changing the connection state of the main pipeline with the bypass pipeline and the discharge pipeline, the flow direction of the slurry can be changed to realize the circulation of the residual slurry. Therefore, the structure of the slurry conveying device is relatively simple, the manufacturing cost of the slurry conveying device is low, that is, the use cost and the manufacturing cost of the slurry conveying device are both reduced, thereby reducing the manufacturing cost of the battery.

[0086] The slurry conveying device of the embodiments of the present disclosure can be used in the battery production process, for example, for conveying the battery slurry to the electrode sheet coating device, etc. Of course, those skilled in the art should understand that the slurry conveying device provided by the embodiments of the present disclosure is not only used for conveying the slurry in the battery production process, but also can be used for conveying other easily-settled slurries that need to be conveyed.

[0087] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to FIGS. 1-8.

[0088] FIG. 1 is a schematic view of one structure of a slurry conveying device provided by some embodiments of the present disclosure; FIG. 2 is an enlarged view of A in FIG. 1; FIG. 3 is a top view of the internal structure of a main pipeline provided by some embodiments of the present disclosure; FIG. 4 is a side view of the main pipeline provided by some embodiments of the present disclosure; and FIG. 5 is a schematic view of another structure of a slurry conveying device provided by some embodiments of the present disclosure.

[0089] As shown in Fig. 1, the first aspect of the present disclosure provides a slurry conveying device 10, which comprises a main pipeline 1, a bypass pipeline 2 and a discharge pipeline 3, the bypass pipeline 2 is connected to the main pipeline 1; one end of the discharge pipeline 3 is connected to one end of the main pipeline 1, and the other end is used for outputting slurry; the slurry conveying device 10 has a slurry conveying state and a slurry circulating state, in the slurry conveying state, the main pipeline 1 and the bypass pipeline 2 are not communicated, the main pipeline 1 and the discharge pipeline 3 are communicated to convey the slurry conveyed from the feeding pipeline 4, in the slurry circulating state, the main pipeline 1 and the discharge pipeline 3 are not communicated, the main pipeline 1 and the bypass pipeline 2 are communicated to form a circulating loop for the slurry circulating flow.

[0090] "Communication" means that the internal passages of two connected pipelines are communicated, which can provide a passage for the slurry flow. "Non-communication" means that the internal passage of at least one of the two connected pipelines is blocked or the connection of the two passages is blocked, so that the pipeline group formed by the two connected pipelines is not communicated, which does not provide a passage for the slurry flow, that is, the slurry is not allowed to flow. Therefore, in the slurry conveying state, the main pipeline 1 and the bypass pipeline 2 are not communicated, the pipeline group formed by the main pipeline 1 and the bypass pipeline 2 does not allow the slurry to flow, while the main pipeline 1 and the discharge pipeline 3 are communicated, the pipeline group formed by the main pipeline 1 and the discharge pipeline 3 (hereinafter referred to as conveying pipeline) allows the slurry to flow, so that the slurry entering from the end of the main pipeline 1 away from the discharge pipeline 3 can flow through the main pipeline 1 and the discharge pipeline 3 in turn, thereby conveying the slurry. In the slurry circulating state, the main pipeline 1 and the discharge pipeline 3 are not communicated, the pipeline group formed by the main pipeline 1 and the discharge pipeline 3 does not allow the slurry to flow, the main pipeline 1 and the bypass pipeline 2 are communicated, the pipeline group (circulating loop) formed by the main pipeline 1 and the bypass pipeline 2 allows the slurry to flow, that is, the slurry can circulate in the circulating loop.

[0091] When the slurry needs to be transported, the slurry transporting device is in the slurry transporting state, the main pipeline 1 and the bypass pipeline 2 are not communicated, the main pipeline 1 and the discharge pipeline 3 are communicated, and the slurry transported from the feeding pipeline 4 is transported; after the slurry transportation is completed, the slurry transporting device 10 is in the slurry circulating state, the main pipeline 1 and the discharge pipeline 3 are not communicated, the main pipeline 1 and the bypass pipeline 2 are communicated and form a circulating loop, and the residual slurry in the slurry transporting device 10 circulates in the circulating loop. In this way, the slurry in the main pipeline is in a flowing state, the probability of gelation due to static placement can be reduced, the number of operations for removing the gel can be reduced, and thus the use cost of the slurry transporting device 10 can be reduced. Moreover, the flow direction of the slurry can be changed by changing the communication state of the main pipeline 1, the bypass pipeline 2 and the discharge pipeline 3, and the residual slurry can circulate. Therefore, the structure of the slurry transporting device 10 is relatively simple, the manufacturing cost of the slurry transporting device 10 is low, that is, the use cost and the manufacturing cost of the slurry transporting device 10 are both reduced, and thus the manufacturing cost of the battery is reduced.

[0092] In some embodiments of the present disclosure, the main pipeline 1 includes a first main channel 11 and a second main channel 12. The first main channel 11 has a first channel port 111 and a second channel port 112, and the second main channel 12 has a third channel port 121 and a fourth channel port 122. The first channel port 111 of the first main channel 11 and the third channel port 121 of the second main channel 12 are connected to the feeding pipeline 4, and the second channel port 112 of the first main channel 11 and the fourth channel port 122 of the second main channel 12 are connected to the discharge pipeline 3. A first valve 51 is arranged between the first main channel 11 and the second main channel 12, and is used to communicate or not communicate the first main channel 11 and the second main channel 12 with each other.

[0093] “Communicated with each other” means that the connection between two channels is communicated, and means that the slurry in one channel can enter the other channel through the connection between the two channels. “Not communicated with each other” means that the connection between two channels has a block, and the two channels are not communicated, that is, they are isolated from each other, and means that the slurry in each channel cannot enter the other channel. When the first main channel 11 and the second main channel 12 are communicated with each other, the slurry in the first main channel 11 can enter the second main channel 12, and / or the slurry in the second main channel 12 can enter the first main channel 11. When the first main channel 11 and the second main channel 12 are not communicated with each other, the first main channel 11 and the second main channel 12 are isolated from each other, the slurry in the first main channel 11 cannot enter the second main channel 12, and the slurry in the second main channel 12 cannot enter the first main channel 11.

[0094] The first main channel 11 and the second main channel 12 are communicated with each other by the first valve 51, and the slurry input from the input pipeline 4 is divided into two paths, and the two paths of slurry enter the output pipeline 3 through the first main channel 11 and the second main channel 12 respectively to transport the slurry; the first main channel 11 and the second main channel 12 are communicated with each other by the first valve 51, and the first main channel 11 and the second main channel 12 form a circulation loop with the bypass pipeline 2 to make the residual slurry flow in circulation.

[0095] The first main channel 11 and the second main channel 12 of the main pipeline 1 can be arranged in two pipe bodies respectively, or arranged in the same pipe body.

[0096] In this way, the main pipeline 1 and the output pipeline 3 are communicated to form a transport pipeline, and the main pipeline 1 and the bypass pipeline 2 are communicated to form a circulation loop, so as to realize the switching of the transport pipeline and the circulation loop. Moreover, the slurry transport device 10 has simple structure and low manufacturing cost, the slurry in the main pipeline 1 is in a flowing state, which can reduce the probability of gelation due to static placement and reduce the operation frequency of removing the gel, so as to reduce the use cost of the slurry transport device 10, that is, the use cost and manufacturing cost of the slurry transport device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0097] In some embodiments of the present disclosure, as shown in FIGS. 1, 3 and 4, the main pipeline 1 includes a pipe body 13 and a partition plate 14 arranged in the pipe body 13, the partition plate 14 divides the channel in the pipe body 13 into the first main channel 11 and the second main channel 12, and the first valve 51 is arranged on the partition plate 14.

[0098] The channel in the pipe body 13 is divided into the first main channel 11 and the second main channel 12 by the partition plate 14, which reduces the number of pipelines, saves cost, makes the structure compact, and occupies small space. Moreover, the first valve 51 is arranged on the partition plate 14, and the first main channel 11 and the second main channel 12 can be switched between the communicated state and the non-communicated state by opening and closing the first valve 51, so that the structure is simple and the switching operation is simple.

[0099] In some embodiments of the present disclosure, the slurry transport device 10 further includes a connecting piece 6 connected to the main pipeline 1, the output pipeline 3 and the bypass pipeline 2 respectively.

[0100] The connection piece 6 is arranged to realize the mutual connection among the main pipeline 1, the discharge pipeline 3 and the bypass pipeline 2, so that the main pipeline 1 can be communicated with the discharge pipeline 3 to form a conveying pipeline, or communicated with the bypass pipeline 2 to form a circulating loop. In addition, the slurry conveying device 10 has a simple structure and low manufacturing cost, the slurry in the main pipeline 1 is in a flowing state, the probability of gelation due to static placement can be reduced, the operation frequency of removing the gelation can be reduced, and thus the use cost of the slurry conveying device 10 can be reduced, that is, both the use cost and the manufacturing cost of the slurry conveying device 10 are reduced, and thus the manufacturing cost of the battery is reduced.

[0101] In some embodiments of the present disclosure, as shown in FIG. 2, the connection piece 6 has a first port 61, a second port 62, a third port 63, a fourth port 64 and a fifth port 65, the first port 61 is connected with the second channel port 112 of the first main channel 11, the second port 62 is connected with the fourth channel port 122 of the second main channel 12, the third port 63 and the fourth port 64 are respectively connected with two ends of the bypass pipeline, and the fifth port 65 is connected with the discharge pipeline.

[0102] The connection piece 6 can be a connection structure only for connecting the first main channel 11, the second main channel 12, the discharge pipeline 3 and the bypass pipeline 2, or can be a valve capable of connecting and adjusting the communication and non-communication state between the ports.

[0103] In this way, the mutual connection among the first main channel 11, the second main channel 12, the discharge pipeline 3 and the bypass pipeline 2 is realized, so that the first main channel 11 and the second main channel 12 can be communicated with the discharge pipeline 3 to form a conveying pipeline, or communicated with the bypass pipeline 2 to form a circulating loop. In addition, the slurry conveying device 10 has a simple structure and low manufacturing cost, the slurry in the main pipeline 1 is in a flowing state, the probability of gelation due to static placement can be reduced, the operation frequency of removing the gelation can be reduced, and thus the use cost of the slurry conveying device 10 can be reduced, that is, both the use cost and the manufacturing cost of the slurry conveying device 10 are reduced, and thus the manufacturing cost of the battery is reduced.

[0104] In some embodiments of the present disclosure, the first port 61 is communicated with the third port 63 and the fifth port 65, the second port 62 is communicated with the fourth port 64 and the fifth port 65, the first port 61 and the second port 62 are not communicated, and the third port 63 and the fourth port 64 are not communicated.

[0105] The connection piece 6 is a connection structure only for connecting the first main channel 11, the second main channel 12, the discharge pipeline 3 and the bypass pipeline 2, and the non-communication or communication state between the first main channel 11 and the second main channel 12 and the bypass pipeline 2 and the discharge pipeline 3 can be realized by cooperating with the valves arranged on the bypass pipeline 2 and the discharge pipeline 3.

[0106] As shown in FIG. 1 and FIG. 2, the third valve 53 and the fourth valve 54 are arranged at two ends of the bypass pipeline 2 respectively, the third valve 53 is arranged close to the third port 63, the fourth valve 54 is arranged close to the fourth port 64, and the second valve 52 is arranged at one end of the discharge pipeline 3 close to the fifth port 65. In the slurry conveying state, the third valve 53 and the fourth valve 54 are both closed, so that the first main channel 11 and the second main channel 12 are both not communicated with the bypass pipeline 2, and the second valve 52 is opened, so that the first main channel 11 and the second main channel 12 are both communicated with the discharge pipeline 3; in the slurry circulating state, the third valve 53 and the fourth valve 54 are both opened, so that the first main channel 11 and the second main channel 12 are both communicated with the bypass pipeline 2 to form a circulating loop, and the second valve 52 is closed, so that the first main channel 11 and the second main channel 12 are both not communicated with the discharge pipeline 3.

[0107] In the slurry conveying state, as shown in FIG. 1 and FIG. 2, the straight arrow in FIG. 1 indicates the flow direction of the slurry, the slurry input from the feeding pipeline 4 is divided into two paths, the two paths of slurry pass through the first main channel 11 and the second main channel 12 respectively and enter the connecting piece 6 through the first port 61 and the second port 62 of the connecting piece 6 respectively, and both enter the discharge pipeline 3 through the fifth port 65 to realize the conveying of the slurry; in the slurry circulating state, as shown in FIG. 2 and FIG. 5, the straight arrow in FIG. 5 indicates the flow direction of the slurry, after the conveying of the slurry is stopped, the slurry remaining in the first main channel 11 and the second main channel 12 circulates through the first main channel 11, the first valve 51, the second main channel 12, the second port 62, the fourth port 64, the bypass pipeline 2, the third port 63 and the first port 61 in turn to realize the circulating flow of the residual slurry.

[0108] In this way, by limiting the communication state between the ports of the connecting piece 6, the first main channel 11 and the second main channel 12 can be communicated with the discharge pipeline 3 respectively to form a conveying pipeline or communicated with two ends of the bypass pipeline 2 respectively to form a circulating loop, so as to realize the switching of the conveying pipeline and the circulating loop. Moreover, the slurry conveying device 10 has simple structure and low manufacturing cost, the slurry in the main pipeline 1 is in flowing state, which can reduce the probability of gelation due to static and the operation frequency of removing the gel, so as to reduce the use cost of the slurry conveying device 10, that is, both the use cost and the manufacturing cost of the slurry conveying device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0109] In some embodiments of the present disclosure, the connecting piece 6 is a valve having the function of adjusting the communication or non-communication between the ports, in the slurry conveying state, the connecting piece 6 is adjusted to the first port 61 only communicated with the fifth port 65, and the second port 62 only communicated with the fifth port 65; in the slurry circulating state, the connecting piece 6 is adjusted to the first port 61 only communicated with the third port 63, and the second port 62 only communicated with the fourth port 64.

[0110] The first port 61 is only connected to the fifth port 65, and the second port 62 is only connected to the fifth port 65, so that the slurry flowing out of the first main channel 11 and the second main channel 12 flows into the fifth port 65 through the first port 61 and the second port 62 respectively, and then is transported to the discharge pipeline 3. The first port 61 is only connected to the third port 63, and the second port 62 is only connected to the fourth port 64, so that the slurry flowing into the second main channel 12 can enter the connecting piece 6 through the second port 62, enter the bypass pipeline 2 through the fourth port 64, enter the connecting piece 6 through the third port 63, and then flow out through the first port 61 and enter the first main channel 11. The slurry in the first main channel 11 enters the second main channel 12 through the first valve 51, and circulates as above, realizing the circulating flow of the slurry in the circulating loop.

[0111] When the connecting piece 6 is a valve with an adjusting function, the third valve 53 and the fourth valve 54 can not be arranged on the bypass pipeline 2, and the second valve 52 can not be arranged on the discharge pipeline 3. Of course, the third valve 53 and the fourth valve 54 can be arranged on the bypass pipeline 2, and the second valve 52 can be arranged on the discharge pipeline 3.

[0112] In this way, the connection or non-connection of the first main channel 11 and the second main channel 12 with the discharge pipeline 3 and the bypass pipeline 2 is adjusted, so that the first main channel 11 and the second main channel 12 can be connected with the discharge pipeline 3 to form a transport pipeline, or can be connected with the bypass pipeline 2 to form a circulating loop, thereby realizing the switching of the transport pipeline and the circulating loop. Moreover, the slurry transport device 10 has a simple structure and low manufacturing cost, the slurry in the main pipeline is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the slurry transport device 10, i.e., both the use cost and the manufacturing cost of the slurry transport device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0113] In some embodiments of the present disclosure, the first port 61 and the second port 62 are arranged at the same end of the connecting piece 6.

[0114] In this way, the first port 61 and the second port 62 can be directly connected with the first main channel 11 and the second main channel 12 located in the same pipe body 13 respectively, which simplifies the connection structure and further reduces the manufacturing cost.

[0115] In some embodiments of the present disclosure, the first port 61 and the second port 62 are arranged at the same end of the connecting piece 6, the fifth port 65 is arranged at the other end of the connecting piece 6 opposite to the first port 61, the third port 63 and the fourth port 64 are arranged at opposite ends of the connecting piece 6 respectively, and the directions opposite to each other of the third port 63 and the fourth port 64 are perpendicular to the directions opposite to each other of the fifth port 65 and the first port 61.

[0116] In this way, the layout of each port of the connector 6 is relatively uniform, which is conducive to reducing the size of the connector 6, and the space around each port is relatively large, which facilitates the connection operation of the pipeline and the connector 6.

[0117] In some embodiments of the present disclosure, as shown in FIGS. 1 and 3, the end of the partition plate 14 away from the connector 6 is formed with a through hole, and the first valve 51 is installed in the through hole. In the slurry conveying state, the first valve 51 is adjusted to a closed state to make the first main passage 11 and the second main passage 12 not communicate with each other, and in the slurry circulating state, the first valve 51 is adjusted to an open state to make the first main passage 11 and the second main passage 12 communicate with each other.

[0118] The first valve 51 adjusts the state of the first main passage 11 and the second main passage 12 to communicate or not to communicate with each other by opening or closing, to switch the conveying circuit and the circulating loop. By arranging the first valve 51 at the end of the partition plate 14 away from the connector 6, the distance of the slurry flowing in the first main passage 11 and the second main passage 12 is relatively far, so that the slurry is in a relatively fast flow state as much as possible, which better reduces the probability of gelation.

[0119] In some embodiments of the present disclosure, the first valve 51 includes a one-way valve or a two-way valve.

[0120] Both the one-way valve and the two-way valve can realize the adjustment of the first main passage 11 and the second main passage 12 to communicate or not to communicate with each other, and the optional range is wide, which is conducive to reducing the cost.

[0121] In some embodiments of the present disclosure, the slurry conveying device 10 further includes a second valve 52, which is installed at the end of the discharge pipeline 3 close to the main pipeline 1. In the slurry conveying state, the second valve 52 is adjusted to an open state to make the discharge pipeline 3 and the main pipeline 1 communicate with each other, and in the slurry circulating state, the second valve 52 is adjusted to a closed state to make the discharge pipeline 3 and the main pipeline 1 not communicate with each other.

[0122] By arranging the second valve 52, the adjustment of the main pipeline 1 and the discharge pipeline 3 to communicate or not to communicate with each other is realized, so that the main pipeline 1 can communicate with the discharge pipeline 3 to form a conveying pipeline, or communicate with the bypass pipeline 2 to form a circulating loop, thereby realizing the switching of the conveying pipeline and the circulating loop. Moreover, the structure of the slurry conveying device 10 is simple, the manufacturing cost is low, the slurry in the main pipeline 1 is in a flowing state, which can reduce the probability of gelation due to static placement and reduce the number of operations for removing the gelation, thereby being able to reduce the use cost of the slurry conveying device 10, that is, both the use cost and the manufacturing cost of the slurry conveying device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0123] In some embodiments of the present disclosure, the end of the discharge pipeline 3 away from the main pipeline 1 extends into the slurry tank 7, and in the slurry conveying state, the slurry conveyed from the inlet pipeline 4 enters the slurry tank 7 through the main pipeline 1 and the discharge pipeline 3 in turn.

[0124] The slurry is conveyed into the slurry tank 7 for use by the pole piece coating device 30 for coating work.

[0125] In some embodiments of the present disclosure, the inlet pipeline 4 is connected with a first pump 81, and in the slurry conveying state, the first pump 81 drives the slurry to flow in the main pipeline 1 and the discharge pipeline 3; the bypass pipeline 2 is connected with a second pump 82, and in the slurry circulating state, the second pump 82 drives the slurry in the circulating loop to circulate in the circulating loop.

[0126] The first pump 81 provides power for the conveying of the slurry, and the second pump 82 provides power for the circulation of the slurry in the circulating loop, realizing the flow of the slurry in the two states, reducing the probability of gelation due to standing, and reducing the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device 10, and the structure of the slurry conveying device 10 is simple, and the manufacturing cost is low, that is, both the use cost and the manufacturing cost of the slurry conveying device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0127] In some embodiments of the present disclosure, the first pump 81 includes a screw pump, and the second pump 82 includes a diaphragm pump.

[0128] In the slurry conveying state, the flow rate of the slurry is relatively large, and a screw pump with relatively large power is more suitable, while in the slurry circulating state, the flow rate of the slurry flowing in the circulating loop is relatively small, and a diaphragm pump with relatively small power is more suitable, which not only enables the slurry to flow at an appropriate flow rate, but also helps to suppress the cost.

[0129] In some embodiments of the present disclosure, the conveying flow rate of the second pump 82 is adjustable, and the conveying flow rate adjusted by the second pump 82 is not greater than 150 L / min.

[0130] For example, the conveying flow rate adjusted by the second pump 82 can be 80 L / min, 85 L / min, 90 L / min, 95 L / min, 100 L / min, 105 L / min, 110 L / min, 115 L / min, 120 L / min, 125 L / min, 130 L / min, 135 L / min, 140 L / min, 145 L / min, or 150 L / min, etc.

[0131] In some embodiments of the present disclosure, the discharge pipeline 3 extends along the vertical direction.

[0132] The discharge pipeline 3 is arranged to extend along the vertical direction, so that the slurry in the discharge pipeline 3 flows downward under the action of gravity, which is beneficial to save the energy of the first pump 81, and in the slurry circulating state, the slurry in the discharge pipeline 3 is not easy to settle on the inner wall of the discharge pipeline 3, thereby reducing the probability of gelation.

[0133] In some embodiments of the present disclosure, the partition plate 14 and the pipe body 13 are integrally formed.

[0134] In this way, the structural strength of the main pipeline 1 as a whole is improved, and the manufacturing efficiency is high.

[0135] In some embodiments of the present disclosure, the fifth valve 55 is arranged at one end of the inlet pipeline 4 connected to the main pipeline 1, and in the slurry conveying state, the fifth valve 55 is in an open state, the inlet pipeline 4 and the first main passage 11 and the second main passage 12 of the main pipeline 1 are in communication, so that the slurry entering from the inlet pipeline 4 can enter the first main passage 11 and the second main passage 12; in the slurry circulating state, the fifth valve 55 is in a closed state, the first main passage 11 and the second main passage 12 are not in communication with the inlet pipeline 4, and the fifth valve 55 seals the first passage opening 111 of the first main passage 11 and the third passage opening 121 of the second main passage 12, so that the slurry does not flow back to the inlet pipeline 4 in the slurry circulating state.

[0136] In some embodiments of the present disclosure, the material of the pipe body 13 is hard engineering plastic.

[0137] For example, the material of the pipe body 13 is at least one of polyamide, polytetrafluoroethylene, polyether ether ketone, polyphenylene sulfide, polycarbonate and polyphenyl ether.

[0138] The hard engineering plastic has high mechanical strength, low friction coefficient, strong wear resistance, and is easy to obtain.

[0139] FIG. 6 is a structural schematic diagram of a battery coating line provided by some embodiments of the present disclosure.

[0140] As shown in FIG. 6, the second aspect of the present disclosure provides a battery coating line, which comprises a slurry preparation device 20, a pole piece coating device 30 and the slurry conveying device 10 provided by the first aspect of the present disclosure, the slurry preparation device 20 is used for preparing slurry, and the pole piece coating device 30 is used for coating the slurry on the current collector to become a pole piece; wherein the slurry conveying device 10 is used for conveying the slurry prepared by the slurry preparation device 20 to the pole piece coating device 30.

[0141] In the slurry conveying state, the slurry conveying device 10 conveys the slurry for the pole piece coating device 30 to use, and in the slurry circulating state, the slurry in the circulating loop circulates in the circulating loop.

[0142] Since the battery coating line comprises the slurry conveying device 10, the battery coating line comprises all the advantages of the slurry conveying device 10, and thus the use cost and manufacturing cost of the battery coating line are reduced, thereby reducing the manufacturing cost of the battery.

[0143] FIG. 7 is a flowchart of a slurry conveying method according to some embodiments of the present disclosure; and FIG. 8 is another flowchart of a slurry conveying method according to some embodiments of the present disclosure.

[0144] In a third aspect of the present disclosure, a slurry conveying method is provided, which uses a slurry conveying device 10 comprising a main pipeline 1, a bypass pipeline 2 connected to the main pipeline 1, and a discharge pipeline 3 having one end connected to one end of the main pipeline 1 and the other end used for outputting slurry.

[0145] As shown in FIG. 7, the slurry conveying method comprises:

[0146] S1, a slurry conveying step: making the main pipeline and the bypass pipeline non-communicate, and making the main pipeline and the discharge pipeline communicate, and conveying the slurry conveyed from the feeding pipeline;

[0147] S2, a slurry circulating step: making the main pipeline and the discharge pipeline non-communicate, and making the main pipeline and the bypass pipeline communicate and form a circulating loop, and making the slurry flow in the circulating loop,

[0148] The slurry circulating step is performed in a state where the slurry conveying step is stopped.

[0149] It should be noted that the slurry conveying step and the slurry circulating step are not in a sequence, and the slurry circulating step is performed when the slurry conveying step is stopped, and the slurry conveying step is performed when the slurry circulating step is needed to be stopped.

[0150] In the slurry conveying step, the slurry is conveyed through the main pipeline 1 and the discharge pipeline 3, and in the slurry circulating step, the slurry in the main pipeline 1 flows in the circulating loop formed by the main pipeline 1 and the bypass pipeline 2, so that the slurry in the main pipeline 1 is in a flowing state, which can reduce the probability of gelation due to static and reduce the number of operations for removing the gel, thereby reducing the use cost of the slurry conveying device 10, and the flow direction of the slurry can be changed by changing the communication state of the main pipeline 1 with the bypass pipeline 2 and the discharge pipeline 3, and the residual slurry can flow in a circulating manner, so that the structure of the slurry conveying device 10 is relatively simple, the manufacturing cost of the slurry conveying device 10 is low, and thus the use cost and manufacturing cost of the slurry conveying device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0151] In some embodiments of the present disclosure, the main pipe 1 comprises a first main channel 11 and a second main channel 12, the first main channel 11 has a first channel port 111 and a second channel port 112, the second main channel 12 has a third channel port 121 and a fourth channel port 122, the first channel port 111 of the first main channel 11 and the third channel port 121 of the second main channel 12 are connected to the inlet pipe 4 respectively, the second channel port 112 of the first main channel 11 and the fourth channel port 122 of the second main channel 12 are connected to the outlet pipe 3 respectively, a first valve 51 is arranged between the first main channel 11 and the second main channel 12, and the first valve 51 is used to make the first main channel 11 and the second main channel 12 communicate with each other or not communicate with each other;

[0152] As shown in FIG. 8, the slurry conveying step comprises:

[0153] S11, a conveying route communication step: making the first main channel and the second main channel respectively communicate with the outlet pipe, making the first main channel and the second main channel both not communicate with the bypass pipe, and making the first main channel and the second main channel not communicate with each other by the first valve;

[0154] S12, a driving slurry conveying step: making the slurry conveyed from the inlet pipe be divided into two routes and enter the outlet pipe through the first main channel and the second main channel respectively;

[0155] The slurry circulating step comprises:

[0156] S21, a circulating route communication step: making the first main channel and the second main channel respectively communicate with the bypass pipe, making the first main channel and the second main channel both not communicate with the outlet pipe, and making the first main channel and the second main channel communicate with each other by the first valve;

[0157] S22, a driving slurry circulating step: making the slurry in the first main channel and the second main channel circulate through the first main channel, the second main channel and the bypass pipe.

[0158] In this way, the route is switched first, so that the main pipe 1 communicates with the outlet pipe 3 to form a conveying pipe or communicates with the bypass pipe 2 to form a circulating loop, thereby realizing the switching of the conveying pipe and the circulating loop, then making the slurry flow in the respective pipes, realizing the conveying or circulating flow of the slurry, which can reduce the probability of gelation due to static placement, reduce the operation frequency of removing the gel, thereby reducing the use cost of the slurry conveying device 10, and the structure of the slurry conveying device 10 is simple, the manufacturing cost is low, that is, the use cost and the manufacturing cost of the slurry conveying device 10 are both reduced, thereby reducing the manufacturing cost of the battery.

[0159] In some embodiments of the present disclosure, the slurry conveying device 10 further comprises a second valve 52, the second valve 52 is installed on one end of the outlet pipe 3 close to the main pipe 1;

[0160] In the delivery route communication step, the second valve 52 is adjusted to an open state, so that the first main channel 11 and the second main channel 12 are respectively communicated with the discharge pipeline 3;

[0161] In the circulation route communication step, the second valve 52 is adjusted to a closed state, so that the first main channel 11 and the second main channel 12 are both not communicated with the discharge pipeline 3.

[0162] Through the adjustment of the second valve 52, the communication or non-communication between the main pipeline 1 and the discharge pipeline 3 is realized, so that the main pipeline 1 can be communicated with the discharge pipeline 3 to form a delivery pipeline, or communicated with the bypass pipeline 2 to form a circulation loop, thereby realizing the switching of the delivery pipeline and the circulation loop. Moreover, the pulp delivery device 10 has a simple structure and low manufacturing cost, the pulp in the main pipeline 1 is in a flowing state, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the pulp delivery device 10, i.e., both the use cost and the manufacturing cost of the pulp delivery device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0163] In some embodiments of the present disclosure, the first pump 81 is connected to the feeding pipeline 4, and the second pump 82 is connected to the bypass pipeline 2.

[0164] In the driving pulp delivery step, the first pump 81 is started to drive the pulp delivered from the feeding pipeline 4 to be divided into two paths and enter the discharge pipeline 3 through the first main channel 11 and the second main channel 12 respectively;

[0165] In the driving pulp circulation step, the second pump 82 is started to drive the pulp in the first main channel 11 and the second main channel 12 to flow through the first main channel 11, the second main channel 12 and the bypass pipeline 2 in a circulation manner.

[0166] The first pump 81 drives the pulp to flow in the delivery pipeline, and the second pump 82 drives the pulp to flow in the circulation loop in a circulation manner, realizing the flow of the pulp in two states, which can reduce the probability of gelation due to static placement and the number of operations for removing the gel, thereby reducing the use cost of the pulp delivery device 10. Moreover, the pulp delivery device 10 has a simple structure and low manufacturing cost, i.e., both the use cost and the manufacturing cost of the pulp delivery device 10 are reduced, thereby reducing the manufacturing cost of the battery.

[0167] Hereinafter, specific examples of some embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0168] As a specific example, the slurry conveying device 10 comprises a main pipe (main pipe 1), a bypass pipe (bypass pipe 2) and a discharge pipe (discharge pipe 3), the bypass pipe and the discharge pipe are connected to the main pipe respectively, the end of the discharge pipe away from the main pipe extends into a 1200L transfer tank (slurry tank 7), a pipe partition (partition 14) is arranged in the internal passage of the main pipe, the pipe partition separates the internal passage into a first flow channel (first main passage 11) and a second flow channel (second main passage 12), the end of the pipe partition away from the bypass pipe is provided with a one-way valve (first valve 51), the main pipe and the discharge pipe are connected through an on-off valve (connection 6), the two ends of the bypass pipe are connected to the on-off valve respectively, the end of the discharge pipe close to the main pipe is provided with a discharge valve (second valve 52), the upstream of the main pipe is provided with a screw pump (first pump 81), the bypass pipe is connected with a diaphragm pump (second pump 82).

[0169] When the slurry conveying device 10 conveys slurry, the discharge valve is opened, the one-way valve is closed, and the on-off valve adjusts the first flow channel and the second flow channel to be communicated with the discharge pipe respectively, the screw pump is started, and the slurry enters the transfer tank through the main pipe and the discharge pipe in turn; when the slurry conveying device 10 stops conveying slurry, the discharge valve is closed, the one-way valve is opened, and the on-off valve adjusts the first flow channel and the second flow channel to be communicated with the two ends of the bypass pipe respectively, forming a circulating loop, the screw pump is closed, and the diaphragm pump is started, the slurry remaining in the first flow channel and the second flow channel circulates in the circulating loop.

[0170] The delivery flow of the diaphragm pump is adjustable within 0-150L / min, and the recommended value of the delivery flow of the diaphragm pump is 100L / min.

[0171] The above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit it; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the specification of the present disclosure. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. Industrial applicability

[0172] The present disclosure provides a slurry conveying device, a battery coating line and a slurry conveying method capable of reducing the manufacturing cost of the battery, when the slurry needs to be conveyed, the slurry conveying device is in a slurry conveying state, the main pipeline and the bypass pipeline are not communicated, the main pipeline and the discharge pipeline are communicated, and the slurry conveyed from the inlet pipeline is conveyed; after the slurry conveying is completed, the slurry conveying device is in a slurry circulating state, the main pipeline and the discharge pipeline are not communicated, the main pipeline and the bypass pipeline are communicated and form a circulating loop, and the residual slurry in the main pipeline circulates in the circulating loop, in this way, the slurry in the main pipeline is in a flowing state, the probability of gelation due to static placement can be reduced, the number of operations for removing the gel can be reduced, thereby the use cost of the slurry conveying device can be reduced, and by changing the communication state of the main pipeline with the bypass pipeline and the discharge pipeline, the flow direction of the slurry can be changed, the residual slurry can be circulated, therefore, the structure of the slurry conveying device is relatively simple, and the manufacturing cost of the slurry conveying device is low.

Claims

1. A slurry conveying device, comprising: a main pipeline; a bypass pipeline connected to the main pipeline; a discharge pipeline having one end connected to one end of the main pipeline and the other end for outputting slurry; wherein the slurry conveying device has a slurry conveying state and a slurry circulating state, in the slurry conveying state, the main pipeline and the bypass pipeline are not connected, the main pipeline and the discharge pipeline are connected to convey slurry conveyed from a feeding pipeline, in the slurry circulating state, the main pipeline and the discharge pipeline are not connected, the main pipeline and the bypass pipeline are connected to form a circulating loop for circulating slurry; the main pipeline comprises a first main channel and a second main channel, the first main channel has a first channel port and a second channel port, the second main channel has a third channel port and a fourth channel port, the first channel port of the first main channel and the third channel port of the second main channel are respectively connected to the feeding pipeline, the second channel port of the first main channel and the fourth channel port of the second main channel are respectively connected to the discharge pipeline, a first valve is arranged between the first main channel and the second main channel, and the first valve is used to connect or disconnect the first main channel and the second main channel.

2. The slurry delivery device of claim 1, wherein, the main pipeline comprises a pipe body and a partition plate arranged in the pipe body, the partition plate separates the channels in the pipe body into the first main channel and the second main channel, and the first valve is arranged on the partition plate.

3. The slurry delivery device of claim 2, wherein, the slurry conveying device further comprises a connecting piece connected to the main pipeline, the discharge pipeline and the bypass pipeline.

4. The slurry delivery device of claim 3, wherein, the connecting piece has a first port, a second port, a third port, a fourth port and a fifth port, the first port is connected to the second channel port of the first main channel, the second port is connected to the fourth channel port of the second main channel, the third port and the fourth port are respectively connected to two ends of the bypass pipeline, and the fifth port is connected to the discharge pipeline.

5. The slurry delivery device of claim 4, wherein, the first port is connected to the third port and the fifth port, the second port is connected to the fourth port and the fifth port, the first port and the second port are not connected, and the third port and the fourth port are not connected.

6. The slurry delivery device of claim 5, wherein, the first port and the second port are arranged at the same end of the connecting piece.

7. The slurry delivery device of any one of claims 2 to 6, wherein, an end of the partition plate away from the connecting piece is formed with a through hole, the first valve is installed in the through hole, in the slurry conveying state, the first valve is adjusted to a closed state to make the first main channel and the second main channel not connected to each other, in the slurry circulating state, the first valve is adjusted to an open state to make the first main channel and the second main channel connected to each other.

8. The slurry delivery device of any one of claims 1 to 7, wherein, the slurry conveying device further comprises a second valve installed at one end of the discharge pipeline close to the main pipeline, in the slurry conveying state, the second valve is adjusted to an open state to make the discharge pipeline and the main pipeline connected to each other, In the slurry circulating state, the second valve is adjusted to the closed state so as to make the discharge pipeline and the main pipeline non-communicate.

9. The slurry delivery device of any one of claims 1 to 8, wherein, An end of the discharge pipeline away from the main pipeline extends into a slurry tank, and in the slurry conveying state, slurry conveyed from the feeding pipeline enters the slurry tank in sequence through the main pipeline and the discharge pipeline.

10. The slurry delivery device of any one of claims 1 to 9, wherein, The feeding pipeline is connected with a first pump, and in the slurry conveying state, the first pump drives slurry to flow in the main pipeline and the discharge pipeline. The bypass pipeline is connected with a second pump, and in the slurry circulating state, the second pump drives slurry in the circulating loop to flow in the circulating loop.

11. The slurry delivery device of any one of claims 1 to 10, wherein, The discharge pipeline extends along a vertical direction.

12. A battery coating line, comprising: a slurry preparation device for preparing slurry; the slurry conveying device according to any one of claims 1 to 11; a pole piece coating device for coating slurry on a current collector to become a pole piece; wherein the slurry conveying device is used to convey slurry prepared by the slurry preparation device to the pole piece coating device.

13. A slurry conveying method using a slurry conveying device, the slurry conveying device comprising a main pipeline, a bypass pipeline connected to the main pipeline, and a discharge pipeline having one end connected to one end of the main pipeline and the other end used for outputting slurry; the slurry conveying method comprising: a slurry conveying step of making the main pipeline and the bypass pipeline non-communicate, and making the main pipeline and the discharge pipeline communicate, and conveying slurry conveyed from a feeding pipeline; a slurry circulating step of making the main pipeline and the discharge pipeline non-communicate, and making the main pipeline and the bypass pipeline communicate to form a circulating loop, and making slurry flow in the circulating loop, the slurry circulating step being performed in a state that the slurry conveying step is stopped; the main pipeline comprising a first main passage and a second main passage, the first main passage having a first passage port and a second passage port, the second main passage having a third passage port and a fourth passage port, the first passage port of the first main passage and the third passage port of the second main passage being respectively connected to the feeding pipeline, the second passage port of the first main passage and the fourth passage port of the second main passage being respectively connected to the discharge pipeline, a first valve being provided between the first main passage and the second main passage, the first valve being used to make the first main passage and the second main passage communicate with each other or non-communicate with each other; the slurry conveying step comprising: a conveying route communication step of making the first main passage and the second main passage respectively communicate with the discharge pipeline, the first main passage and the second main passage both non-communicate with the bypass pipeline, and making the first main passage and the second main passage non-communicate with each other by the first valve; a slurry conveying driving step of making slurry conveyed from the feeding pipeline be divided into two paths and enter the discharge pipeline through the first main passage and the second main passage respectively; the slurry circulating step comprising: ​ The circulation route communication step is to make the first main channel and the second main channel communicate with the bypass pipeline respectively, and the first main channel and the second main channel are both non-communicated with the discharge pipeline, and the first main channel and the second main channel are communicated with each other through the first valve; The slurry circulation driving step is to make the slurry in the first main channel and the second main channel circulate through the first main channel, the second main channel and the bypass pipeline.

14. The slurry delivery method of claim 13, wherein, The slurry conveying device further comprises a second valve, which is installed on the discharge pipeline close to one end of the main pipeline; In the conveying route communication step, the second valve is adjusted to an open state, so that the first main channel and the second main channel are communicated with the discharge pipeline respectively, In the circulation route communication step, the second valve is adjusted to a closed state, so that the first main channel and the second main channel are both non-communicated with the discharge pipeline.

15. The slurry delivery method of claim 13 or 14, wherein, The inlet pipeline is connected with a first pump, and the bypass pipeline is connected with a second pump; In the slurry conveying driving step, the first pump is started to drive the slurry conveyed from the inlet pipeline to be divided into two paths and enter the discharge pipeline through the first main channel and the second main channel respectively; In the slurry circulation driving step, the second pump is started to drive the slurry in the first main channel and the second main channel to circulate through the first main channel, the second main channel and the bypass pipeline.

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