Coating system and battery production line

Abstract

The application relates to the technical field of battery production, and in particular to a coating system and a battery production line. The coating system comprises a coating device, a thickness measuring device and a control device. The coating device is used for coating slurry on a pole piece. The thickness measuring device is used for detecting the thickness of the pole piece coated with the slurry. The coating device and the thickness measuring device are electrically connected with the control device respectively. The control device is configured to control the coating device to adjust the flow of the slurry based on the thickness of the pole piece. The coating system of the embodiment of the application can be configured to control the coating device to adjust the flow of the slurry based on the thickness of the pole piece, adjust the flow of the discharge port of the coating device, make the pole piece coated with the slurry fluctuate within a predetermined range, and reduce the probability of too thin or too thick tab glue.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a coating system and a battery production line. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] With the increasing maturity of new energy technologies, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0004] In the production of battery devices, the coating of adhesive onto the tabs is a crucial step. During the coating process, the thickness of the adhesive on the tabs can easily become too thin or too thick, affecting the size and performance of the battery device. Utility Model Content

[0005] In view of the above problems, this application provides a coating system and a battery production line, which solves the problem that the thickness of the tab adhesive in the prior art is often too thin or too thick.

[0006] A first aspect of the embodiments of this application provides a coating system, comprising:

[0007] A coating device for applying a slurry onto an electrode sheet;

[0008] Thickness measuring device, used to detect the thickness of electrode sheets whose surfaces are coated with paste; and

[0009] The control device, coating device, and thickness measuring device are electrically connected to the control device, which is configured as an electrode-based thickness control coating device to adjust the slurry flow rate.

[0010] The coating system of this application includes a coating device, a thickness measuring device, and a control device. The coating device is used to coat a slurry onto an electrode sheet, and the thickness measuring device is used to detect the thickness of the electrode sheet coated with the slurry. The coating device and the thickness measuring device are electrically connected to the control device. The control device is configured to control the coating device to adjust the slurry flow rate based on the thickness of the electrode sheet. This allows the control device to control the slurry flow rate of the coating device according to the detection result of the thickness measuring device, and adjust the flow rate at the outlet of the coating device, so that the electrode sheet coated with the slurry fluctuates within a predetermined range, reducing the probability of the tab adhesive being too thin or too thick.

[0011] In some embodiments of this application, the coating system further includes a feeding device; the coating device includes a feeding pipe, a first power pump, a flow valve, and a coating head. The first power pump is located at the inlet end of the feeding pipe and is electrically connected to a control device for providing power to transport the slurry from the feeding device to the feeding pipe; the flow valve is located on the feeding pipe and is electrically connected to the control device; the coating head is connected to the outlet end of the feeding pipe for coating the electrode with slurry.

[0012] The embodiments of this application include a coating device comprising a feeding pipe, a first power pump, a flow valve, and a coating head. The first power pump is located at the inlet end of the feeding pipe and is electrically connected to a control device to provide power for conveying the slurry from the feeding device to the feeding pipe. The flow valve is located on the feeding pipe and is electrically connected to the control device. The coating head is connected to the outlet end of the feeding pipe and is used to coat the electrode with slurry. Thus, the coating of the slurry can be achieved through the feeding device, the feeding pipe, the flow valve, the first power pump, and the coating head. The pumping speed of the first power pump and the opening degree of the flow valve can be adjusted by the control device to adjust the flow rate of the slurry and control the thickness of the slurry.

[0013] In some embodiments of this application, the coating apparatus further includes a flow meter disposed on the feed pipe.

[0014] The embodiments of this application can measure the flow rate by installing a flow meter on the feed pipe, thereby achieving accurate control of the slurry flow rate.

[0015] In some embodiments of this application, the number of feeding pipes is at least two, each feeding pipe including a first pipe and a second pipe connected to each other, the first pipe is provided with a flow valve and a flow meter, and the second pipe is connected to a first power pump.

[0016] The embodiments of this application provide at least two feeding pipes, each of which includes a first pipe and a second pipe connected to each other. The first pipe is equipped with a flow valve and a flow meter, and the second pipe is connected to a first power pump. This allows the surface of the electrode to be coated separately through multiple feeding pipes, thereby improving the efficiency and uniformity of the coating slurry.

[0017] In some embodiments of this application, the number of first pipes is at least two, all first pipes are connected in parallel and connected to the second pipes respectively, and each first pipe is provided with a flow valve and a flow meter.

[0018] The embodiments of this application set the number of first pipes to at least two, all of which are connected in parallel and connected to the second pipes respectively. Each first pipe is equipped with a flow valve and a flow meter. The flow rate on each first pipe can be accurately controlled by the flow valve and flow meter on each first pipe, thereby improving the accurate control of the slurry flow rate.

[0019] In some embodiments of this application, the feeding device includes a storage tank, a second power pump, and a conveying pipeline. The conveying pipeline is equipped with the second power pump and the storage tank, wherein the second power pump is used to convey the slurry from the storage tank to the first power pump.

[0020] The embodiments of this application include a feeding device comprising a storage tank, a second power pump, and a conveying pipeline. The conveying pipeline is equipped with the second power pump and the storage tank. The second power pump is used to convey slurry from the storage tank to the first power pump. Thus, the slurry in the storage tank can be conveyed to the first power pump through the second power pump and the conveying pipeline, thereby realizing the conveying and transfer of slurry.

[0021] In some embodiments of this application, the feeding device further includes a filter element disposed on the conveying pipe and located on the output side of the second power pump.

[0022] The embodiments of this application, by setting a filter element and placing the filter element on the conveying pipeline and located on the output side of the second power pump, can filter the slurry through the filter element, reducing the probability of impurities flowing into the first power pump.

[0023] In some embodiments of this application, the coating system further includes a drying device located downstream of the coating apparatus and used to dry the electrode sheet coated with slurry by the coating apparatus.

[0024] In the embodiments of this application, a drying device is provided. The drying device is located downstream of the coating device and is used to dry the electrode sheet coated with slurry. This allows the electrode sheet coated with slurry to be dried, resulting in dry slurry and electrode sheet.

[0025] In some embodiments of this application, the thickness measuring device includes a laser thickness gauge, which is electrically connected to a control device.

[0026] The embodiments of this application, by setting up a laser thickness gauge and electrically connecting the laser thickness gauge to a control device, can detect the thickness of the electrode sheet with slurry coating on its surface, thus facilitating the control of the slurry thickness.

[0027] In some embodiments of this application, the laser thickness gauge includes a displacement sensor for measuring the position of an electrode whose surface is coated with a dried slurry.

[0028] The embodiments of this application include a displacement sensor, which measures the position of an electrode sheet coated with dried slurry, thereby facilitating the calculation of the thickness of the electrode sheet coated with dried slurry.

[0029] In some embodiments of this application, the control device includes a PID controller, which is electrically connected to both the coating device and the thickness measuring device.

[0030] The embodiments of this application include a PID controller in the control device, and the PID controller is electrically connected to both the coating device and the thickness measuring device. Thus, the PID controller, which combines proportional, integral, and derivative control, can respond quickly and accurately to changes in the system, providing stability and precision.

[0031] A second aspect of the embodiments of this application provides a battery production line, including the coating system mentioned in the above embodiments, the coating system being used to coat an electrode sheet with a slurry; and a die-cutting system, the die-cutting system being electrically connected to the control device of the coating system and being used to cut the electrode sheet coated by the coating system.

[0032] In some embodiments of this application, the control device is also configured to control the cutting power of the die-cutting system based on the detection results of the thickness measuring device.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This application provides a schematic diagram of the structure of a coating system according to some embodiments.

[0036] Figure 2 for Figure 1 A simplified structural diagram of the coating apparatus of the coating system shown;

[0037] Figure 3 for Figure 1 The diagram shows the control principle of the coating system.

[0038] Figure 4 for Figure 1The diagram shows the test principle structure of the thickness measuring device for the coating system.

[0039] The attached figures are labeled as follows:

[0040] 100. Coating system;

[0041] 10. Feeding device; 11. Storage tank; 12. Second power pump; 13. Conveying pipeline; 14. Filter element; 15. Pressure detection element; 16. First shut-off valve; 17. Second shut-off valve;

[0042] 20. Coating device; 21. Feeding pipe; 211. First pipe; 212. Second pipe; 22. First power pump; 23. Flow valve; 24. Coating head; 25. Flow meter;

[0043] 30. Drying device;

[0044] 40. Thickness measuring device; 41. Displacement sensor; 411. First sensor; 412. Second sensor;

[0045] 50. Control device;

[0046] 200, Electrode;

[0047] 300, back roller;

[0048] T, the thickness of the electrode sheet;

[0049] L represents the distance between the first and second displacement devices;

[0050] L1, the distance between the upper surface of the first displacement device and the electrode plate;

[0051] L2, the distance between the lower surface of the second displacement device and the electrode. Detailed Implementation

[0052] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0053] 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 application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0058] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0060] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0061] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0062] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0064] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0065] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0066] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0067] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0068] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0069] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0070] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0071] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0072] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0073] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0074] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0075] In the production of battery devices, the coating of tab adhesive is a crucial step. This tab adhesive primarily refers to the cathode tab adhesive, which serves an insulating function. During the coating process, the thickness of the tab adhesive can easily become too thin or too thick, affecting the size and performance of the battery device.

[0076] To address this problem, embodiments of this application propose a coating system, including a coating device, a thickness measuring device, and a control device. The coating device is used to coat an electrode sheet with a slurry to obtain an electrode sheet coated with the slurry. The thickness measuring device is used to detect the thickness of the electrode sheet coated with the slurry. The coating device and the thickness measuring device are electrically connected to the control device, which is configured to control the coating state of the coating device based on the detection result of the thickness measuring device. The coating system of this application includes a coating device, a thickness measuring device, and a control device. The coating device is used to coat a slurry onto an electrode to obtain an electrode coated with slurry. The thickness measuring device is used to detect the thickness of the electrode coated with slurry. The coating device and the thickness measuring device are electrically connected to the control device. The control device is configured to control the coating device based on the thickness of the electrode to adjust the flow rate of the slurry. This allows the control device to control the coating state of the coating device according to the detection result of the thickness measuring device, and adjust the flow rate of the outlet of the coating device so that the electrode coated with slurry fluctuates within a predetermined range, reducing the probability of the tab adhesive being too thin or too thick.

[0077] The coating system described in the embodiments of this application can be used in the process of coating current collectors on electrodes, or in other coating scenarios, such as the automotive industry.

[0078] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0079] A first aspect of the embodiments of this application provides a coating system 100, such as Figures 1 to 3 As shown, the coating system 100 includes a coating device 20, a thickness measuring device 40, and a control device 50. The coating device 20 is used to coat the electrode 200 with a slurry to obtain an electrode 200 coated with the slurry. The thickness measuring device 40 is used to detect the thickness of the electrode 200 coated with the slurry. The coating device 20 and the thickness measuring device 40 are electrically connected to the control device 50. The control device 50 is configured to control the coating device 20 based on the thickness of the electrode 200 to adjust and control the flow rate of the slurry. That is, the control device 50 is used to control the coating state of the coating device 20 according to the detection result of the thickness measuring device 40.

[0080] It should be noted that the coating device 20 here is a device for coating the slurry onto the electrode 200, and the thickness measuring device 40 here is used to detect the thickness of the electrode 200 with the slurry coated on its surface. The thickness of the electrode 200 is the thickness after drying. The drying method can be carried out by the drying device 30. That is to say, the thickness measuring device 40 is used to measure the electrode 200 after drying, wherein the surface of the electrode 200 is coated with the dried slurry.

[0081] The control device 50 here controls the coating state of the coating device 20 according to the detection results of the thickness measuring device 40. This means that the control device 50 controls the coating flow rate of the coating device 20 according to the detection results of the thickness measuring device 40, which can be achieved by controlling the parameters of the coating device 20. In other words, the control device 50 can control the coating device 20 to adjust the flow rate of the slurry based on the thickness of the electrode 200.

[0082] The coating system 100 of this application includes a coating device 20, a thickness measuring device 40, and a control device 50. The coating device 20 is used to coat a slurry onto an electrode 200 to obtain an electrode 200 coated with slurry. The thickness measuring device 40 is used to detect the thickness of the electrode 200 coated with slurry. The coating device 20 and the thickness measuring device 40 are electrically connected to the control device 50. The control device 50 is configured to control the coating device 20 to adjust the flow rate of the slurry based on the thickness of the electrode 200. This allows the control device 50 to control the coating state of the coating device 20 according to the detection result of the thickness measuring device 40, and adjust the flow rate of the outlet of the coating device 20, so that the electrode 200 coated with slurry fluctuates within a predetermined range, reducing the probability of the tab adhesive being too thin or too thick.

[0083] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the coating system 100 also includes a feeding device 10; the coating device 20 includes a feeding pipe 21, a first power pump 22, a flow valve 23, and a coating head 24. The first power pump 22 is located at the inlet end of the feeding pipe 21 and is electrically connected to the control device 50, and is used to provide power to transport the slurry from the feeding device 10 to the feeding pipe 21; the flow valve 23 is located on the feeding pipe 21 and is electrically connected to the control device 50; the coating head 24 is connected to the outlet end of the feeding pipe 21 and is used to coat the electrode 200 with slurry.

[0084] It should be noted that the feeding device 10 here is a component that provides slurry to the coating device 20. The coating device 20 includes a feeding pipe 21, a first power pump 22, a flow valve 23, and a coating head 24. The first power pump 22 is used to provide power for the flow of slurry, so that the slurry can flow out from the coating head 24 and be sprayed onto the electrode 200.

[0085] The embodiments of this application include a coating device 20 comprising a feeding pipe 21, a first power pump 22, a flow valve 23, and a coating head 24. The first power pump 22 is located at the inlet end of the feeding pipe 21 and is electrically connected to the control device 50 to provide power for conveying the slurry from the feeding device 10 to the feeding pipe 21. The flow valve 23 is located on the feeding pipe 21. The coating head 24 is connected to the outlet end of the feeding pipe 21. Thus, the slurry can be coated through the feeding device 10, the feeding pipe 21, the flow valve 23, the first power pump 22, and the coating head 24. The pumping speed of the first power pump 22 and the opening degree of the flow valve 23 can be adjusted by the control device 50 to adjust the flow rate of the slurry and control the thickness of the slurry.

[0086] In some embodiments of this application, such as Figure 2 As shown, the coating apparatus 20 also includes a flow meter 25, which is installed on the feed pipe 21.

[0087] The flow meter 25 here is an instrument used to measure the flow rate of fluid in the pipeline. It can measure the instantaneous flow rate or cumulative flow rate of the slurry, thereby monitoring the fluid velocity. It should be noted that the flow meter 25 can be installed downstream of the flow valve 23 or upstream of the flow valve 23.

[0088] The embodiments of this application can measure the flow rate by installing a flow meter 25 on the feed pipe 21, thereby achieving accurate control of the slurry flow rate.

[0089] In some embodiments of this application, such as Figure 2 As shown, there are at least two feeding pipes 21. Each feeding pipe 21 includes a first pipe 211 and a second pipe 212 that are connected to each other. The first pipe 211 is equipped with a flow valve 23 and a flow meter 25. The second pipe 212 is connected to the first power pump 22.

[0090] exist Figure 2 In this process, there are three feeding pipes 21, and the three feeding pipes 21 are set independently. Each feeding pipe 21 can coat different positions of the electrode 200, so that the current collector of the electrode 200 can be coated simultaneously.

[0091] The first pipe 211 and the second pipe 212 are interconnected. The first pipe 211 and the second pipe 212 can be a single pipe or two pipes. The two pipes are interconnected and in a connected state.

[0092] In the embodiments of this application, by setting the number of feeding pipes 21 to at least two, and each feeding pipe 21 includes a first pipe 211 and a second pipe 212 connected to each other, the first pipe 211 is provided with a flow valve 23 and a flow meter 25, and the second pipe 212 is connected to the first power pump 22, the surface of the electrode 200 can be coated separately through multiple feeding pipes 21, thereby improving the efficiency and uniformity of coating slurry.

[0093] In some embodiments of this application, such as Figure 2 As shown, there are at least two first pipes 211, and all first pipes 211 are connected in parallel and connected to the second pipes 212 respectively. Each first pipe 211 is equipped with a flow valve 23 and a flow meter 25.

[0094] It should be noted that the two first pipes 211 are respectively connected to the two coating heads 24, and coating can be performed on different positions of the electrode 200 through the two coating heads 24 respectively.

[0095] exist Figure 2 In this application, there are three first power pumps 22, and each first power pump 22 can provide power to two first pipes 211. Compared with one first power pump 22 controlling one first pipe 211, this structure can reduce the number of first power pumps 22 and reduce the cost of coating device 20.

[0096] Alternatively, the number of first power pumps 22 can also be set to one. In this case, the first power pump 22 can control six first pipes 211 simultaneously, and the six first pipes 211 are set in parallel. Of course, the number of first power pumps 22 can also be set to two. In this case, one first power pump 22 can control three first pipes 211 simultaneously.

[0097] In the embodiments of this application, by setting the number of first pipes 211 to at least two, each first pipe 211 is connected to a second pipe 212, and each first pipe 211 is provided with a flow valve 23 and a flow meter 25, the flow rate on each first pipe 211 can be accurately controlled by the flow valve 23 and the flow meter 25 on each first pipe 211, thereby improving the accurate control of the flow rate of the slurry.

[0098] In some embodiments of this application, such as Figure 1 As shown, the feeding device 10 includes a storage tank 11, a second power pump 12 and a conveying pipe 13. The conveying pipe 13 is equipped with the second power pump 12 and the storage tank 11. The second power pump 12 is used to convey the slurry from the storage tank 11 to the first power pump 22.

[0099] It should be noted that the storage tank 11 here can be a tank that serves as a buffer, and the second power pump 12 can be a screw pump that can continuously and stably supply slurry to the coating device 20.

[0100] In the embodiments of this application, the feeding device 10 includes a storage tank 11, a second power pump 12, and a conveying pipe 13. The conveying pipe 13 is equipped with the second power pump 12 and the storage tank 11. The second power pump 12 is used to convey slurry from the storage tank 11 to the first power pump 22. Thus, the slurry in the storage tank 11 can be conveyed to the first power pump 22 through the second power pump 12 and the conveying pipe 13, thereby realizing the conveying and transfer of slurry.

[0101] In some embodiments of this application, such as Figure 1 As shown, the feeding device 10 also includes a filter element 14, which is disposed on the conveying pipe 13 and located on the output side of the second power pump 12.

[0102] The filter element 14 here is a component for filtering the slurry, which can reduce the probability of impurities entering the coating device 20.

[0103] In the embodiments of this application, by setting a filter element 14 and placing the filter element 14 on the conveying pipe 13 and located on the output side of the second power pump 12, the slurry can be filtered through the filter element 14, reducing the probability of impurities flowing into the first power pump 22.

[0104] Optionally, the feeding device 10 further includes a first shut-off valve 16 and a second shut-off valve 17, wherein the first shut-off valve 16 is located downstream of the filter element and is used to control the flow of the pipeline to the coating device 20. The second shut-off valve 17 is also located downstream of the filter element and is used to control the flow of the pipeline to the storage tank 11.

[0105] Optionally, the feeding device 10 also includes a pressure detection element 15, which is located in the conveying pipe 13 and is used to measure the pressure on the conveying pipe 13.

[0106] In some embodiments of this application, such as Figure 1 As shown, the coating system 100 also includes a drying device 30, which is located downstream of the coating device 20 and upstream of the thickness measuring device 40. The drying device 30 is used to dry the electrode 200 coated with slurry by the coating device 20.

[0107] The drying device 30 can be implemented using heating components. The specific drying temperature and time can be determined according to the composition of the slurry. The drying process can be divided into multiple stages, and common structures in the prior art can be referenced. They will not be described in detail here.

[0108] In this embodiment, a drying device 30 is provided to dry the electrode 200 coated with slurry. This allows for the drying of the electrode 200 coated with slurry, resulting in dried slurry and electrode 200. The drying device 30 removes the solvent used in the coating process, ensuring uniformity and stability of the electrode 200.

[0109] In some embodiments of this application, such as Figure 1 As shown, the thickness measuring device 40 includes a laser thickness gauge, which is electrically connected to the control device 50.

[0110] A laser thickness gauge is an instrument used to measure thickness. A laser thickness gauge typically consists of two laser displacement sensors 41, positioned vertically opposite each other. The two sensors measure the positions of the upper and lower surfaces of the object being measured, respectively, and the thickness is calculated from the measured thickness. The advantages of a laser thickness gauge are that it uses non-contact measurement, making it more accurate than contact thickness gauges, and its accuracy is not affected by wear. It also offers higher accuracy than ultrasonic thickness gauges.

[0111] The embodiments of this application, by setting up a laser thickness gauge and electrically connecting the laser thickness gauge to the control device 50, can detect the thickness of the electrode sheet 200 with slurry coated on its surface, thus facilitating the control of the slurry thickness.

[0112] Specifically, a laser thickness gauge is installed downstream of the drying unit 30 and before the coating and winding process to control the thickness of the slurry.

[0113] In some embodiments of this application, such as Figure 4 As shown, the laser thickness gauge includes a displacement sensor 41, which is used to measure the position of the electrode 200 whose surface is coated with dried slurry.

[0114] The displacement sensor 41 includes a first sensor 411 and a second sensor 412, wherein the first sensor 411 and the second sensor 412 are located on opposite sides of the electrode 200 along the thickness direction. The interval between the first sensor 411 and the second sensor 412 is L, the distance between the first sensor 411 and the upper surface of the electrode 200 is L1, the distance between the second sensor 412 and the lower surface of the electrode 200 is L2, and the thickness of the electrode 200 is T, wherein T includes the thickness of the slurry.

[0115] The thickness T of electrode 200 can be obtained by calculating T = L - L1 - L2.

[0116] The embodiments of this application include a displacement sensor 41, which is used to measure the position of the electrode 200 coated with dried slurry, thereby facilitating the calculation of the thickness of the electrode 200 coated with dried slurry.

[0117] Optionally, the laser thickness gauge also includes a bracket for mounting the first and second sensors. The bracket can be configured as a C-shaped structure or other structures, which will not be described in detail here.

[0118] In some embodiments of this application, the control device 50 includes a PID controller, which is electrically connected to the coating device 20 and the thickness measuring device 40.

[0119] like Figure 3 As shown, the PID controller (Proportion-Integral-Derivative controller) consists of a proportional unit (P), an integral unit (I), and a derivative unit (D). The PID controller is electrically connected to both the coating device 20 and the thickness measuring device 40, enabling closed-loop control of the coating device 20.

[0120] The embodiments of this application include a PID controller in the control device 50, and the PID controller is electrically connected to both the coating device 20 and the thickness measuring device 40. Thus, the PID controller, which combines proportional, integral, and derivative control, can respond quickly and accurately to changes in the system, providing stability and precision.

[0121] The control principle and control process of the coating system 100 will be described in detail below.

[0122] like Figure 3 As shown, the target range is determined, the initial flow rate of the slurry is obtained, the control device 50 controls the control system, outputs the opening degree of the flow valve 23 and the pumping speed of the first power pump 22, and the thickness measuring device 40 feeds back the obtained measurement results to the control device 50 to realize closed-loop control of the slurry thickness.

[0123] First, manually adjust the coating gap. The coating gap refers to the distance between the coating head 24 and the electrode 200 during the coating process. The electrode 200 is in contact with the surface of the back roller 300 and can move around the back roller 300.

[0124] Secondly, the opening control of the first power pump 22 and the flow valve 23 and the detection result of the thickness measuring device 40 are within the range of the target thickness. In order to realize the early warning function, ±80% of the median value of the target thickness can be set as the early warning boundary. When the thickness exceeds the early warning boundary, the control device 50 can control the coating system 100 to stop, check whether the second power pump 12 is abnormal, and replace the parts in time to reduce the probability of batch defects of the electrode 200 and improve the pass rate of electrode 200 production.

[0125] The opening degree of the flow valve 23 is the travel distance or angle of the flow valve 23 from the fully closed state to the fully open state. Here, the opening degree of the flow valve 23 is set to the range of 0 to 100%.

[0126] When the thickness measuring device 40 is working, in the closed-loop control system, the opening of the flow valve 23 needs to be greater than or equal to 10%, otherwise the slurry may not be able to be discharged. Therefore, the opening of the flow valve 23 needs to be set to be greater than or equal to 10%. When the opening of the flow valve 23 is 10%, if the thickness of the electrode 200 has not reached the middle value of the target range, the pumping speed of the first power pump 22 decreases in a gradient of 0.1 rpm. When the pumping speed of the first power pump 22 decreases to a certain pumping speed, the thickness of the electrode 200 reaches near the middle value. At this time, the pumping speed of the first power pump 22 no longer changes. Subsequently, the opening of the flow valve 23 will control the thickness of the electrode 200 to fluctuate stably within the range of ±4 of the middle value. The unit of thickness can be millimeters.

[0127] When the thickness of electrode 200 drops to the warning threshold, the opening of flow valve 23 will automatically increase. When the opening of flow valve 23 is 100%, if the thickness of electrode 200 has not yet reached the intermediate value, the first power pump 22 will be controlled to increase at a speed of 0.1 rpm. When the pumping speed of the first power pump 22 increases to a certain speed, the thickness of electrode 200 will be near the intermediate value. At this time, the pumping speed of the first power pump 22 will not change. Subsequently, the thickness of electrode 200 will be controlled to fluctuate stably within the range of ±4 of the intermediate value by adjusting the opening of flow valve 23.

[0128] It should be noted that the median value here can be represented by the average value of the target thickness range.

[0129] A second aspect of the embodiments of this application provides a battery production line, including the coating system 100 mentioned in the above embodiments and a die-cutting system (not shown). The coating system 100 is used to coat the electrode 200 with a slurry; the die-cutting system is electrically connected to the control device 50 of the coating system 100 and is used to cut the electrode 200 coated by the coating system 100.

[0130] Of course, the battery production line also includes other systems, such as welding systems and winding systems, which will not be described in detail here. Among them, the die-cutting system is the next process after the coating system 100. The control device 50 can be electrically connected to the die-cutting system to control the cutting power of the die-cutting system.

[0131] In some embodiments of this application, the control device 50 is also used to control the cutting power of the die-cutting system based on the detection results of the thickness measuring device 40.

[0132] The cutting power of the die-cutting system is directly proportional to the thickness of the electrode 200. When the thickness of the electrode 200 is large, the cutting power of the die-cutting system is also greater, which reduces the occurrence of situations where the die-cutting system cannot cut the electrode 200, and can reduce the occurrence of burrs, reduce the debugging time and debugging cost of the die-cutting system, and is applicable to different types of electrode 200.

[0133] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0134] A first aspect of the embodiments of this application provides a coating system 100, including a coating device 20, a thickness measuring device 40, and a control device 50. The coating device 20 is used to coat an electrode 200 with a slurry. The thickness measuring device 40 is used to detect the thickness of the electrode 200 with the slurry coated on its surface. The coating device 20 and the thickness measuring device 40 are electrically connected to the control device 50, which is configured to control the coating device 20 based on the thickness of the electrode 200 to adjust the flow rate of the slurry. Furthermore, the coating system 100 also includes a feeding device 10; the coating device 20 includes a feeding pipe 21, a first power pump 22, a flow valve 23, and a coating head 24. The first power pump 22 is located at the inlet end of the feeding pipe 21 and is electrically connected to the control device 50, for providing power to transport the slurry from the feeding device 10 to the feeding pipe 21; the flow valve 23 is located on the feeding pipe 21 and is electrically connected to the control device 50; the coating head 24 is connected to the outlet end of the feeding pipe 21, for coating the electrode 200 with slurry. Furthermore, the coating device 20 also includes a flow meter 25, which is located on the feeding pipe 21. Furthermore, the number of feeding pipes 21 is at least two, each feeding pipe 21 including a first pipe 211 and a second pipe 212 connected to each other. The first pipe 211 is equipped with a flow valve 23 and a flow meter 25, and the second pipe 212 is connected to the first power pump 22. Further, the number of first pipes 211 is at least two, and all first pipes 211 are arranged in parallel and connected to second pipes 212 respectively. Each first pipe 211 is equipped with a flow valve 23 and a flow meter 25. Further, the feeding device 10 includes a storage tank 11, a second power pump 12, and a conveying pipe 13. The conveying pipe 13 is equipped with the second power pump 12 and the storage tank 11, wherein the second power pump 12 is used to convey the slurry from the storage tank 11 to the first power pump 22. Further, the feeding device 10 also includes a filter element 14, which is disposed on the conveying pipe 13 and located on the output side of the second power pump 12. Further, the coating system 100 also includes a drying device 30, which is disposed downstream of the coating device 20 and is used to dry the electrode sheet 200 coated with slurry. Further, the thickness measuring device 40 includes a laser thickness gauge, which is electrically connected to the control device 50. Furthermore, the laser thickness gauge includes a displacement sensor 41, which is used to measure the position of the electrode 200 whose surface is coated with dried slurry. Furthermore, the control device 50 includes a PID controller, which is electrically connected to both the coating device 20 and the thickness measuring device 40.

[0135] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A coating system, characterized in that, include: A coating device for applying a slurry onto an electrode sheet; A thickness measuring device, the thickness measuring device being used to detect the thickness of the electrode sheet on which the slurry is coated; as well as A control device is provided, wherein the coating device and the thickness measuring device are electrically connected to the control device, and the control device is configured to control the coating device based on the thickness of the electrode to adjust the flow rate of the slurry.

2. The coating system as described in claim 1, characterized in that, The coating system also includes a feeding device; The coating apparatus includes: Material supply pipeline; A first power pump is located at the inlet end of the feeding pipe and is electrically connected to the control device, used to provide power for the slurry to be transported from the feeding device to the feeding pipe; A flow valve is provided on the feed pipe and is electrically connected to the control device; A coating head, which is connected to the outlet end of the feeding pipe, is used to coat the slurry onto the electrode sheet.

3. The coating system as described in claim 2, characterized in that, The coating apparatus further includes: A flow meter is installed on the feed pipe.

4. The coating system as described in claim 3, characterized in that, The number of the feeding pipes is at least two, and each feeding pipe includes a first pipe and a second pipe connected to each other. The first pipe is equipped with the flow valve and the flow meter, and the second pipe is connected to the first power pump.

5. The coating system as described in claim 4, characterized in that, The number of the first pipes is at least two, all of which are connected in parallel and connected to the second pipes respectively, and each of the first pipes is equipped with the flow valve and the flow meter.

6. The coating system as claimed in claim 2, characterized in that, The feeding device includes: Storage tanks; Second power pump; A conveying pipeline is provided with a second power pump and a storage tank, wherein the second power pump is used to convey the slurry from the storage tank to the first power pump.

7. The coating system as claimed in claim 6, characterized in that, The feeding device also includes a filter element, which is disposed on the conveying pipe and located on the output side of the second power pump.

8. The coating system according to any one of claims 1 to 7, characterized in that, The coating system also includes: A drying device is located downstream of the coating device and is used to dry the electrode sheet coated with slurry.

9. The coating system according to any one of claims 1 to 7, characterized in that, The thickness measuring device includes a laser thickness gauge, which is electrically connected to the control device.

10. The coating system as claimed in claim 9, characterized in that, The laser thickness gauge includes: A displacement sensor is used to measure the position of the electrode whose surface is coated with a dried slurry.

11. The coating system according to any one of claims 1 to 7, characterized in that, The control device includes a PID controller, which is electrically connected to both the coating device and the thickness measuring device.

12. A battery production line, characterized in that, include: The coating system according to any one of claims 1 to 11, the coating system being used to coat an electrode with a slurry; as well as A die-cutting system, which is electrically connected to the control device of the coating system, and is used to cut the electrode sheet coated by the coating system.

13. The battery production line as described in claim 12, characterized in that, The control device is also configured to control the cutting power of the die-cutting system based on the detection results of the thickness measuring device.

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