Feeding system, coating apparatus and battery manufacturing production line

Abstract

The application relates to a feeding system, a coating device and a battery manufacturing production line. The feeding system comprises a stirring device, a transfer device, a feeding device and a connecting pipe. The connecting pipe comprises an inner pipe and an outer pipe. The outer pipe is arranged outside the inner pipe in a spaced manner. The connecting pipe is located between the stirring device and the transfer device. One of the inner pipe and the outer pipe is used for conveying slurry in the stirring device to the transfer device, and the other of the inner pipe and the outer pipe is used for returning slurry in the transfer device to the stirring device. The connecting pipe is located between the transfer device and the feeding device. One of the inner pipe and the outer pipe is used for conveying slurry in the transfer device to the feeding device, and the other of the inner pipe and the outer pipe is used for returning slurry to the transfer device. The feeding system, the coating device and the battery manufacturing production line can reduce manufacturing cost and energy consumption, and improve production efficiency.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a material supply system, coating equipment, and battery manufacturing production line. Background Technology

[0002] In recent years, the new energy industry has received increasing attention, and batteries, as an important component of this industry, occupy a large market share. Batteries are formed by connecting multiple individual cells in series, parallel, or a hybrid configuration. A hybrid configuration refers to multiple individual cells connected in both series and parallel connections.

[0003] Currently, before slurry coating on batteries, a cooling system is typically used to forcibly cool the slurry, thus facilitating subsequent coating. However, using a cooling system to cool the slurry increases the cost of battery manufacturing, and the cooling system consumes a lot of energy. Adding an extra cooling step to the slurry also leads to a decrease in production efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a material supply system, coating equipment, and battery manufacturing production line that can reduce manufacturing costs and energy consumption while improving production efficiency to address the above problems.

[0005] In a first aspect, this application provides a feeding system, which includes a stirring device, a transfer device, a feeding device and a connecting pipe, wherein the connecting pipe includes an inner pipe and an outer pipe, and the outer pipe is spaced outside the inner pipe;

[0006] The connecting pipe is located between the stirring device and the transfer device, and one of the inner pipe and the outer pipe is used to transport the slurry in the stirring device to the transfer device, and the other of the inner pipe and the outer pipe is used to allow the slurry in the transfer device to flow back to the stirring device.

[0007] And / or, the connecting pipe is located between the transfer device and the feeding device, and one of the inner pipe and the outer pipe is used to transport the slurry in the transfer device to the feeding device, and the other of the inner pipe and the outer pipe is used to allow the slurry in the feeding device to flow back to the transfer device.

[0008] In some embodiments, the outer tube is provided with a plurality of inner tubes, and any two inner tubes in the same outer tube are spaced apart.

[0009] In some embodiments, the inner wall and / or outer wall of the inner tube are covered with a thermally enhanced layer;

[0010] And / or, a vacuum interlayer is provided between the inner wall of the outer tube and the outer wall;

[0011] And / or, the inner wall and / or outer wall of the outer tube are covered with a heat insulation layer.

[0012] In some embodiments, the feeding system further includes a temperature monitoring device installed on the connecting pipe and used to monitor the temperature of the slurry in the inner pipe and / or the outer pipe.

[0013] In some embodiments, the stirring device includes an inner shell and an outer shell, the inner shell having an inner cavity for feeding slurry for stirring, the outer shell being fitted over the outside of the inner shell and sealed to the inner shell, and a vacuum cavity being formed between the outer shell and the inner shell.

[0014] In some embodiments, the outer wall of the housing is covered with at least one of a heat insulation layer, a gas-liquid barrier layer, and a protective layer.

[0015] Secondly, this application provides a coating apparatus, including a feeding system, a coating system, and a drying system as described in any of the above embodiments. The feeding device is connected to the coating system and is used to feed materials to the coating system. The coating system is used to coat electrode sheets, and the drying system is used to dry the electrode sheets.

[0016] In some embodiments, the drying system includes a drying device, an exhaust duct, a heat circulation device, an inlet pipe, and an outlet pipe. The heat circulation device has a receiving cavity for accommodating the heat circulation fluid. The exhaust duct connects the drying device and the receiving cavity and is used to deliver hot air to the receiving cavity.

[0017] The feeding device includes an inner tank and an outer tank. The inner tank has a receiving cavity for containing slurry. The outer tank is sleeved on the outside of the inner tank and is sealed to the inner tank. A thermal circulation interlayer is formed between the outer tank and the inner tank. The liquid inlet pipe and the liquid outlet pipe are both connected between the thermal circulation interlayer and the receiving cavity.

[0018] In some embodiments, the drying system further includes a heating device mounted on the heat circulation device and used to heat the heat circulation fluid in the receiving cavity when the temperature of the heat circulation fluid is below a set threshold.

[0019] Thirdly, this application provides a battery manufacturing production line, including the coating equipment as described in any of the above embodiments.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] The aforementioned feeding system, coating equipment, and battery manufacturing production line are designed with connecting pipes between the stirring device and the transfer device, and / or between the transfer device and the feeding device. Two slurries at different temperatures are connected within the inner and outer pipes of these connecting pipes, and through heat transfer, the temperatures of the slurries in the inner and outer pipes are made to converge. In this configuration, the high-temperature slurry output from the stirring device, as it flows through the connecting pipe, can be cooled by heat transfer with the medium-high temperature slurry and / or medium-low temperature slurry within the connecting pipe before being output to the feeding device to meet the requirements of subsequent coating. This method of cooling the slurry through the internal pipe design of the feeding system eliminates the need for an additional cooling system, thereby reducing battery manufacturing costs. Furthermore, there is no energy consumption during the heat transfer and cooling process via the connecting pipes, significantly reducing energy consumption. Moreover, the cooling and transport of the slurry occur simultaneously, eliminating additional cooling steps and further improving battery production efficiency. Furthermore, compared to the traditional method of cooling using a cooling system, the method of cooling through heat exchange via connecting pipes results in a higher temperature of the slurry ultimately input into the feeding system than the slurry cooled by the cooling system. This can save on the efficiency of subsequent coating and drying, further reducing energy consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the feeding system in one embodiment of this application;

[0023] Figure 2 for Figure 1 A schematic diagram of the cross-section of the connecting pipe in the feeding system shown;

[0024] Figure 3 for Figure 1 A cross-sectional view of the mixing device in the feeding system shown.

[0025] Figure 4 for Figure 1 A cross-sectional view of the feeding device in the feeding system shown;

[0026] Figure 5 This is a schematic diagram of the coating equipment in one embodiment of this application;

[0027] Figure 6 for Figure 5 The diagram shows the structure of the drying system in the coating equipment.

[0028] Icon labels:

[0029] 100. Coating equipment;

[0030] 10. Feeding system; 20. Coating system; 30. Drying system;

[0031] 11. Stirring device; 111. Inner shell; 1111. Inner cavity; 112. Outer shell; 113. Vacuum chamber; 12. Transfer device; 13. Feeding device; 131. Inner tank; 1311. Receiving cavity; 132. Outer tank; 133. Thermal circulation jacket; 14. Connecting pipe; 141. Inner pipe; 142. Outer pipe; 15. Temperature monitoring device;

[0032] 31. Drying device; 32. Exhaust pipe; 33. Heat circulation device; 331. Receiving cavity; 34. Liquid inlet pipe; 35. Liquid outlet pipe; 36. Heating device; 37. Air outlet pipe. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Currently, from a market development perspective, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. As the application areas of batteries continue to expand, the market demand for them is also constantly increasing.

[0040] Currently, before slurry coating on batteries, a cooling system is typically used to forcibly cool the slurry, thus facilitating subsequent coating. However, using a cooling system to cool the slurry increases the cost of battery manufacturing, and the cooling system consumes a lot of energy. Adding an extra cooling step to the slurry also leads to a decrease in production efficiency.

[0041] Please see Figure 1 and Figure 2To alleviate the aforementioned problems, the applicant, after in-depth research, designed a feeding system 10 for supplying materials to the coating system 20. The feeding system 10 includes a stirring device 11, a transfer device 12, a feeding device 13, and a connecting pipe 14. The connecting pipe 14 includes an inner pipe 141 and an outer pipe 142, with the outer pipe 142 spaced outside the inner pipe 141. The connecting pipe 14 is located between the stirring device 11 and the transfer device 12. One of the inner pipe 141 and the outer pipe 142 is used to transport the slurry from the stirring device 11 to the transfer device 12, while the other is used to return the slurry from the transfer device 12 to the stirring device 11. And / or, the connecting pipe 14 is located between the transfer device 12 and the feeding device 13, and one of the inner pipe 141 and the outer pipe 142 is used to transport the slurry in the transfer device 12 to the feeding device 13, and the other of the inner pipe 141 and the outer pipe 142 is used to allow the slurry in the feeding device 13 to flow back to the transfer device 12.

[0042] The stirring device 11 is used to stir the slurry to prevent problems such as sedimentation and clumping. During the stirring process, the rapid stirring and shearing of the stirring paddle causes friction between the slurry particles, generating a large amount of heat, resulting in a high-temperature slurry output by the stirring device 11, with a temperature of approximately 80°C. The transfer device 12 is used to store and buffer the slurry and can continuously supply slurry to the feeding device 13. The feeding device 13 is used to supply slurry to the coating system 20, ensuring that the coating system 20 can coat the electrode sheets. Since the temperature required for battery coating is lower than that of the high-temperature slurry (it is a medium-low temperature slurry), the slurry supplied by the feeding device 13 should also be at a medium-low temperature to meet the coating requirements. Therefore, the slurry needs to be cooled during the process of being transported from the stirring device 11 to the feeding device 13 to adapt to the coating requirements. Therefore, the slurry needs to be cooled during the process of flowing from the mixing device 11 to the transfer device 12, and / or during the process of flowing from the transfer device 12 to the feeding device 13. Generally speaking, after the slurry flows to the transfer device 12, since the slurry is not stirred in the transfer device 12, the slurry can exchange heat with the external environment through the transfer device 12, so as to reduce the temperature of the slurry.

[0043] Optionally, the connecting pipe 14 is located between the stirring device 11 and the transfer device 12, or between the transfer device 12 and the feeding device 13.

[0044] When the connecting pipe 14 is located between the stirring device 11 and the transfer device 12, one of the inner pipe 141 and the outer pipe 142 is used to transport the slurry in the stirring device 11 to the transfer device 12, and the other of the inner pipe 141 and the outer pipe 142 is used to allow the slurry in the transfer device 12 to flow back to the stirring device 11. In this embodiment, the slurry stored in the transfer device 12 is a medium-low temperature slurry, so as to facilitate its subsequent supply of medium-low temperature slurry to the feeding device 13. The medium-low temperature slurry can be formed in the transfer device 12 in a way that, but is not limited to, by using its own structure to achieve heat exchange between the slurry and the external environment, thereby cooling the slurry to form a medium-low temperature slurry.

[0045] Because the high-temperature slurry in the mixing device 11 is higher than the medium- and low-temperature slurry in the transfer device 12, when both the high-temperature and medium- and low-temperature slurries flow through the connecting pipe 14 simultaneously, heat transfer occurs between them. This causes the temperatures of the high-temperature and low-temperature slurries to converge, resulting in the high-temperature slurry decreasing in temperature and being output to the transfer device 12, while the medium- and low-temperature slurry heats up and flows back into the mixing device 11. Through heat transfer within the connecting pipe 14, the high-temperature slurry output from the mixing device 11 can be cooled before being input into the transfer device 12. Then, through heat transfer between the transfer device 12 itself and the external environment, the high-temperature slurry input from the mixing device 11 into the transfer device 12 can form a medium- and low-temperature slurry to meet the temperature requirements of subsequent material supply. The medium- and low-temperature slurry output from the transfer device 12 is heated and then flows back into the mixing device 11 to prevent slurry deposition or clumping.

[0046] When the connecting pipe 14 is located between the transfer device 12 and the feeding device 13, one of the inner pipe 141 and the outer pipe 142 is used to transport the slurry in the transfer device 12 to the feeding device 13, and the other of the inner pipe 141 and the outer pipe 142 is used to allow the slurry in the feeding device 13 to flow back to the transfer device 12. In this embodiment, the temperature of the slurry in the transfer device 12 is higher than that of the medium-low temperature slurry in the feeding device 13, and the slurry in the transfer device 12 is defined as a medium-high temperature slurry. The medium-high temperature slurry can be formed in the transfer device 12 by means of heat transfer between the transfer device 12 itself and the external environment, but is not limited to this method.

[0047] Because the medium-high temperature slurry is higher than the medium-low temperature slurry in the feeding device 13, when both the medium-high temperature slurry and the medium-low temperature slurry flow through the connecting pipe 14 simultaneously, heat transfer occurs between them, causing their temperatures to converge. The medium-high temperature slurry, after its temperature decreases, is output to the feeding device 13, while the medium-low temperature slurry heats up and flows back to the transfer device 12. Through heat transfer, the medium-high temperature slurry can be cooled before being input into the feeding device 13 to meet the temperature requirements of subsequent coating. The medium-low temperature slurry output from the feeding device 13, after being heated, flows back to the transfer device 12 to prevent slurry deposition or clumping within the transfer device 12.

[0048] In the two different embodiments described above, the transfer device 12 stores medium-low temperature slurry and medium-high temperature slurry, respectively. The transfer device 12 can, but is not limited to, achieve the conversion between medium-high temperature slurry and medium-low temperature slurry by changing the storage time.

[0049] Preferably, connecting pipes 14 are provided between the stirring device 11 and the transfer device 12, and between the transfer device 12 and the feeding device 13. This allows the slurry to be progressively cooled as it is sequentially output from the stirring device 11 to the transfer device 12 and the feeding device 13 via the connecting pipes 14, ultimately meeting the temperature requirements for coating. Specifically, in this embodiment, the stirring device 11 contains high-temperature slurry, the transfer device 12 contains medium-high temperature slurry, and the feeding device 13 contains medium-low temperature slurry.

[0050] In this application, a connecting pipe 14 is designed to connect the stirring device 11 and the transfer device 12, and / or the transfer device 12 and the feeding device 13. Two slurries at different temperatures are connected within the inner pipe 141 and outer pipe 142 of the connecting pipe 14. Through heat transfer, the temperatures of the slurries in the inner pipe 141 and outer pipe 142 are made to converge. In this case, the high-temperature slurry output from the stirring device 11 can be cooled by heat transfer with the medium-high temperature slurry and / or medium-low temperature slurry within the connecting pipe 14 before being output to the feeding device 13 to meet the requirements of subsequent coating. This method of cooling the slurry using the internal pipe design of the feeding system 10 eliminates the need for an additional cooling system, thereby reducing the cost of battery manufacturing. Furthermore, there is no energy consumption during the heat transfer and cooling process using the connecting pipe 14, significantly reducing energy consumption. Moreover, the cooling and transport of the slurry occur simultaneously, eliminating additional cooling steps and further improving battery production efficiency. Furthermore, compared to the traditional method of cooling by using a cooling system, the method of cooling by heat exchange through the connecting pipe 14 results in a higher temperature of the slurry that is ultimately input into the feeding system 10 than the temperature of the slurry formed by cooling by the cooling system. This can save on the efficiency of subsequent coating and drying, and further reduce energy consumption.

[0051] Optionally, when the connecting pipe 14 is located between the mixing device 11 and the transfer device 12, both the inner pipe 141 and the outer pipe 142 are connected between the mixing device 11 and the transfer device 12. The outer pipe 142 is used to transport the slurry in the mixing device 11 to the transfer device 12, and the inner pipe 141 is used to allow the slurry in the transfer device 12 to flow back to the mixing device 11.

[0052] Preferably, when the connecting pipe 14 is located between the stirring device 11 and the transfer device 12, the inner pipe 141 is used to transport the slurry in the stirring device 11 to the transfer device 12, and the outer pipe 142 is used to allow the slurry in the transfer device 12 to flow back to the stirring device 11. In this design, it is equivalent to having a medium-low temperature slurry or a medium-high temperature slurry wrapped around a high temperature slurry inside the connecting pipe 14, resulting in higher heat transfer efficiency between the high temperature slurry and the medium-low temperature slurry or the medium-high temperature slurry.

[0053] Optionally, when the connecting pipe 14 is located between the transfer device 12 and the feeding device 13, both the inner pipe 141 and the outer pipe 142 are connected between the transfer device 12 and the feeding device 13. The outer pipe 142 is used to transport the slurry in the transfer device 12 to the feeding device 13, and the inner pipe 141 is used to allow the slurry in the feeding device 13 to flow back to the transfer device 12.

[0054] Preferably, when the connecting pipe 14 is located between the transfer device 12 and the feeding device 13, the inner pipe 141 is used to transport the slurry in the transfer device 12 to the feeding device 13, and the outer pipe 142 is used to allow the slurry in the feeding device 13 to flow back to the transfer device 12. In this design, it is equivalent to the medium-low temperature slurry being wrapped around the medium-high temperature slurry inside the connecting pipe 14, which makes the heat transfer efficiency between the medium-high temperature slurry and the medium-low temperature slurry higher, so as to meet the needs of subsequent coating.

[0055] In other words, in the preferred embodiment, the inner tube 141 of the connecting pipe 14 flows with a slurry at a higher temperature, while the outer tube 142 of the connecting pipe 14 flows with a slurry at a lower temperature, thereby improving the heat transfer efficiency between slurries with a temperature difference.

[0056] Therefore, the inner tube 141 needs to be made of a high-temperature and corrosion-resistant material, such as, but not limited to, 316L stainless steel. The high-temperature resistance of the outer tube 142 can be slightly inferior to that of the inner tube 141. Considering cost, the outer tube 142 can be made of, but not limited to, 304 stainless steel.

[0057] In some embodiments, the inner wall and / or outer wall of the inner tube 141 are covered with a thermally enhanced layer to enhance the thermal conductivity between the inner tube 141 and the outer tube 142 and improve the heat exchange rate. As an example, the thermally enhanced layer may be, but is not limited to, a graphene coating.

[0058] In some embodiments, a vacuum jacket is provided between the inner and outer walls of the outer tube 142. The vacuum jacket has poor thermal conductivity, which helps to prevent heat from being transferred to the external environment, thereby reducing heat loss. As a result, the slurry finally output to the feeding device 13 has a higher temperature, which can meet the needs of subsequent rapid drying and reduce energy consumption.

[0059] Furthermore, to further prevent direct heat exchange with the external environment, an insulation layer is provided on the inner and / or outer walls of the outer pipe 142. The insulation layer has a better heat insulation effect, effectively preventing heat from being transferred to the external environment, so that the temperature of the slurry finally output into the feeding device 13 is higher, thereby meeting the needs of subsequent rapid drying and reducing energy consumption.

[0060] As an example, the insulation layer can be, but is not limited to, polyethylene foam.

[0061] Please see Figure 2In some embodiments, the outer tube 142 is provided with multiple inner tubes 141, and any two inner tubes 141 within the same outer tube 142 are spaced apart. This increases the heat exchange area between the slurry in the outer tube 142 and the slurry in the inner tubes 141, improving heat exchange efficiency and making the temperatures of the slurry in the outer tube 142 and inner tubes 141 tend to be consistent. Under this design, the temperature of the slurry output from the stirring device 11 to the transfer device 12, or from the transfer device 12 to the feeding device 13, can meet the coating requirements and can be quickly dried after coating.

[0062] As an example, the inner tube 141 may be, but is not limited to, 4 to 8 tubes, for example, 4, 5, 8, etc.

[0063] Please see Figure 1 In some embodiments, the feeding system 10 further includes a temperature monitoring element 15, which is installed on the connecting pipe 14 and is used to monitor the temperature of the slurry in the inner pipe 141 and / or the outer pipe 142, so that the staff can check the temperature of the slurry in the connecting pipe 14 in a timely manner.

[0064] Furthermore, temperature monitoring devices 15 can be installed on the mixing device 11, the transfer device 12, and the feeding device 13. The temperature monitoring device 15 on the mixing device 11 is used to monitor the temperature of the slurry in the mixing device 11, the temperature monitoring device 15 on the transfer device 12 is used to monitor the temperature of the slurry in the transfer device 12, and the temperature monitoring device 15 on the feeding device 13 is used to monitor the temperature of the slurry in the feeding device 13.

[0065] Please see Figure 1 and Figure 3 In some embodiments, the stirring device 11 includes an inner shell 111 and an outer shell 112. The inner shell 111 has an inner cavity 1111 for feeding and stirring the slurry. The outer shell 112 is fitted over the outer shell 111 and is sealed to the inner shell 111. A vacuum cavity 113 is formed between the outer shell 112 and the inner shell 111 to reduce heat loss. In this way, the slurry output from the stirring device 11 still has a high temperature after passing through the transfer device 12 and the feeding device 13, thus enabling rapid drying after coating.

[0066] In some embodiments, the outer wall of the housing 112 is covered with at least one of a heat insulation layer, a gas-liquid barrier layer, and a protective layer.

[0067] As an example, the insulation layer may be, but is not limited to, aerogel or ceramic fiber, the gas-liquid barrier layer may be, but is not limited to, aluminum foil or aluminized polyethylene terephthalate (aluminized PET), and the protective layer may be, but is not limited to, glass fiber cloth or polyimide film.

[0068] In this embodiment, the heat insulation layer improves the heat insulation performance of the mixing device 11, reduces the heat exchange rate between the slurry and the external environment, and ensures that the slurry output from the mixing device 11 maintains a high temperature after passing through the transfer device 12 and the feeding device 13, thus allowing for rapid drying after coating. The gas-liquid barrier layer prevents air or moisture from entering the vacuum chamber 113 through the outer shell 112, increasing the vacuum level within the vacuum chamber 113 and thereby providing better heat insulation for the mixing device 11. The protective layer helps improve the wear resistance and impact resistance of the mixing device 11, extending its service life.

[0069] Please see Figure 1 and Figure 5 This application also provides a coating apparatus 100, which includes a feeding system 10, a coating system 20 and a drying system 30 as provided in any of the above embodiments. The feeding device 13 is connected to the coating system 20 and is used to feed materials to the coating system 20. The coating system 20 is used to coat the electrode sheet, and the drying system 30 is used to dry the electrode sheet.

[0070] The coating equipment 100 provided in this application has the effects of any of the above embodiments, so it will not be described again here.

[0071] Please see Figures 4 to 6 In some embodiments, the drying system 30 includes a drying device 31, an exhaust pipe 32, a heat circulation device 33, an inlet pipe 34, and an outlet pipe 35. The heat circulation device 33 has a receiving cavity 331 for containing the heat circulation fluid. The exhaust pipe 32 connects the drying device 31 and the receiving cavity 331 and is used to supply hot air to the receiving cavity 331. The feeding device 13 includes an inner tank 131 and an outer tank 132. The inner tank 131 has a receiving cavity 1311 for containing slurry. The outer tank 132 is fitted onto the outside of the inner tank 131 and is sealed to the inner tank 131. A heat circulation interlayer 133 is formed between the outer tank 132 and the inner tank 131. The inlet pipe 34 and the outlet pipe 35 are both connected between the heat circulation interlayer 133 and the receiving cavity 331.

[0072] The drying device 31 uses hot air to dry the coated electrode sheets. The exhaust duct 32 transports the hot air from the drying device 31 to the receiving cavity 331 of the heat circulation device 33, where it exchanges heat with the heat circulation fluid to raise the temperature of the fluid. Furthermore, the drying system 30 includes an exhaust duct 37, which is connected to the heat circulation device 33 and communicates with the receiving cavity 331. The hot air is output from the exhaust duct 37 after heat exchange with the heat circulation fluid.

[0073] The feeding device 13 includes an inner tank 131 and an outer tank 132. The inner tank 131 is used to store and contain the slurry and can supply the slurry to the coating system 20. A heat circulation jacket 133 is formed between the outer tank 132 and the inner tank 131. The inlet pipe 34 and the outlet pipe 35 are both connected between the heat circulation jacket 133 and the receiving cavity 331. In this way, the heat circulation fluid heated by hot air in the heat circulation device 33 can circulate between the receiving cavity 331 and the heat circulation jacket 133 through the inlet pipe 34 and the outlet pipe 35, thereby heating the slurry in the receiving cavity 1311 to achieve the temperature required for coating.

[0074] During actual circulation, the hot circulating fluid flows from the containment cavity 331 through the inlet pipe 34 into the hot circulating jacket 133, and then returns to the containment cavity 331 through the outlet pipe 35.

[0075] As an example, the thermal circulation fluid can be, but is not limited to, water, alcohol, or other liquids with good flowability.

[0076] In conventional coating equipment 100, the hot air in the drying device 31 acts on the electrode and is directly discharged into the external environment, resulting in energy waste. In this application, the hot air in the drying device 31 is used to heat the hot circulating fluid, and the hot circulating fluid is controlled to circulate within the hot circulating device 33 and the feeding device 13 to heat the slurry in the feeding device 13, meeting the requirements for high-temperature coating after feeding. Under this design, not only can the hot air in the drying device 31 be reused to heat the slurry, reducing the waste of hot air energy, but the heated slurry is also easier to dry after coating, resulting in high drying efficiency, thereby further reducing energy consumption and contributing to energy conservation.

[0077] In some embodiments, the drying system 30 further includes a heating device 36, which is mounted on the heat circulation device 33 and is used to heat the heat circulation fluid in the receiving cavity 331 when the temperature is below a set threshold.

[0078] As an example, the heating device 36 can be a ceramic heater, electromagnetic heater, infrared heater, resistance heater, etc., and can be specifically set according to requirements.

[0079] In actual operation, when the temperature of the hot circulating fluid in the receiving cavity 331 is lower than the set threshold, the heating device 36 is turned on and heats the hot circulating fluid so that the temperature of the hot circulating fluid can reach the set threshold. After the hot circulating fluid with the set threshold temperature exchanges heat with the slurry in the feeding device 13, the temperature of the slurry increases, thereby enabling coating at a higher temperature, which helps to shorten the subsequent drying time of the electrode and improve the drying efficiency.

[0080] Therefore, in this embodiment, when the hot air heat is insufficient, the heating device 36 can supplement the temperature to improve the drying efficiency of the coated electrode sheet.

[0081] This application also provides a battery manufacturing production line, which includes the coating equipment 100 as described in any of the above embodiments.

[0082] The battery manufacturing production line in this application has the same effects as the coating equipment 100 in any of the above embodiments, so it will not be described again here.

[0083] The aforementioned feeding system 10, coating equipment 100, and battery manufacturing production line are connected by a connecting pipe 14 between the stirring device 11 and the transfer device 12, and / or between the transfer device 12 and the feeding device 13. Two slurries at different temperatures are connected within the inner pipe 141 and outer pipe 142 of the connecting pipe 14. Through heat transfer, the temperatures of the slurries in the inner pipe 141 and outer pipe 142 tend to be uniform. In this case, the high-temperature slurry output from the stirring device 11 can be cooled by heat transfer with the medium-high temperature slurry and / or medium-low temperature slurry within the connecting pipe 14 before being output to the feeding device 13 to meet the requirements of subsequent coating. This method of cooling the slurry using the internal pipe design of the feeding system 10 eliminates the need for an additional cooling system, thereby reducing battery manufacturing costs. Furthermore, during the heat transfer and cooling process via the connecting pipe 14, there is no energy consumption, significantly reducing energy consumption. Moreover, the cooling and transfer of the slurry occur simultaneously, eliminating the need for additional cooling steps and further improving battery production efficiency. Moreover, compared to traditional cooling systems, the heat exchange method via the connecting pipe 14 results in a higher temperature of the slurry ultimately input into the feeding system 10 compared to the temperature of the slurry cooled by the cooling system. This saves on subsequent coating and drying efficiency, further reducing energy consumption.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A feeding system, characterized in that, The feeding system includes a stirring device (11), a transfer device (12), a feeding device (13), and a connecting pipe (14). The connecting pipe (14) includes an inner pipe (141) and an outer pipe (142). The outer pipe (142) is spaced outside the inner pipe (141). The connecting pipe (14) is located between the stirring device (11) and the transfer device (12), and one of the inner pipe (141) and the outer pipe (142) is used to transport the slurry in the stirring device (11) to the transfer device (12), and the other of the inner pipe (141) and the outer pipe (142) is used to allow the slurry in the transfer device (12) to flow back to the stirring device (11); And / or, the connecting pipe (14) is located between the transfer device (12) and the feeding device (13), and one of the inner pipe (141) and the outer pipe (142) is used to transport the slurry in the transfer device (12) to the feeding device (13), and the other of the inner pipe (141) and the outer pipe (142) is used to allow the slurry in the feeding device (13) to flow back to the transfer device (12).

2. The feeding system according to claim 1, characterized in that, The outer tube (142) is provided with a plurality of inner tubes (141), and any two inner tubes (141) in the same outer tube (142) are spaced apart.

3. The feeding system according to claim 1, characterized in that, The inner wall and / or outer wall of the inner tube (141) are covered with a thermally conductive enhancement layer; And / or, a vacuum interlayer is provided between the inner wall of the outer tube (142) and the outer wall; And / or, the inner wall and / or outer wall of the outer tube (142) are covered with a heat insulation layer.

4. The feeding system according to claim 1, characterized in that, The feeding system also includes a temperature monitoring device (15), which is installed on the connecting pipe (14) and is used to monitor the temperature of the slurry in the inner pipe (141) and / or the outer pipe (142).

5. The feeding system according to claim 1, characterized in that, The stirring device (11) includes an inner shell (111) and an outer shell (112). The inner shell (111) has an inner cavity (1111) for feeding slurry stirring. The outer shell (112) is sleeved on the outside of the inner shell (111) and is sealed to the inner shell (111). A vacuum cavity (113) is formed between the outer shell (112) and the inner shell (111).

6. The feeding system according to claim 5, characterized in that, The outer wall of the outer shell (112) is covered with at least one of a heat insulation layer, a gas-liquid barrier layer and a protective layer.

7. A coating apparatus, characterized in that, Includes a feeding system, a coating system (20) and a drying system (30) as described in any one of claims 1 to 6 above, wherein the feeding device (13) is connected to the coating system (20) and is used to feed the coating system (20), the coating system (20) is used to coat the electrode sheet, and the drying system (30) is used to dry the electrode sheet.

8. The coating equipment according to claim 7, characterized in that, The drying system (30) includes a drying device (31), an exhaust pipe (32), a heat circulation device (33), an inlet pipe (34), and an outlet pipe (35). The heat circulation device (33) has a receiving cavity (331) for containing the heat circulation fluid. The exhaust pipe (32) connects the drying device (31) and the receiving cavity (331) and is used to deliver hot air to the receiving cavity (331). The feeding device (13) includes an inner tank (131) and an outer tank (132). The inner tank (131) has a receiving cavity (1311) for receiving slurry. The outer tank (132) is sleeved on the outside of the inner tank (131) and is sealed to the inner tank (131). A heat circulation jacket (133) is formed between the outer tank (132) and the inner tank (131). The liquid inlet pipe (34) and the liquid outlet pipe (35) are both connected between the heat circulation jacket (133) and the receiving cavity (331).

9. The coating equipment according to claim 8, characterized in that, The drying system (30) further includes a heating device (36) which is installed on the heat circulation device (33) and is used to heat the heat circulation fluid in the receiving cavity (331) when the temperature of the heat circulation fluid is lower than a set threshold.

10. A battery manufacturing production line, characterized in that, Includes the coating apparatus as described in any one of claims 7 to 9 above.

Images