Nozzle for liquid phase coating device of lithium battery negative electrode material and working method thereof

Abstract

The present invention belongs to the technical field of nozzles, and specifically relates to a nozzle for a liquid-phase coating device for negative electrode materials of lithium batteries and a working method thereof. The nozzle for the liquid-phase coating device for negative electrode materials of lithium batteries comprises: a nozzle body; and a valve for adjusting the flow of the nozzle body; and a heating component, suitable for adjusting the temperature of the spray in the nozzle body; wherein the valve is arranged at the outlet of the nozzle body, the heating component is sleeved on the periphery of the nozzle body, a reflux mechanism is arranged on the nozzle body, and the valve and the heating component are connected through a linkage mechanism; a flow sensor connected to a control module is arranged in the nozzle body; the nozzle for the liquid-phase coating device for negative electrode materials of lithium batteries reacts to the viscosity of the coating liquid by collecting the flow data in the nozzle body, and adjusts the opening of the valve and the temperature compensation amount of the heating component according to the flow data, and the two are linked to ensure the viscosity and flow of the coating liquid.

Description

Technical Field

[0001] The present invention belongs to the technical field of nozzles, and in particular relates to a nozzle for a liquid phase coating device for negative electrode materials of a lithium battery and a working method thereof. Background Art

[0002] Liquid phase coating of natural graphite negative electrode materials is a common battery material modification method aimed at improving battery performance and stability. Through liquid phase coating, a thin film or coating is formed on the surface of the graphite negative electrode material, which can improve the battery's cycle performance, rate performance and safety.

[0003] In the related art, the coating material is heated to form a coating liquid and then conveyed into a coating barrel; among them, the viscosity of the coating liquid plays a decisive role in the coating quality. When the temperature is too high, the viscosity of the coating liquid will decrease. If this "diluted" coating liquid is conveyed into the coating barrel, the coating will directly fail; when the temperature is too low, the viscosity of the coating liquid will increase. If this "viscous" coating liquid is conveyed into the coating barrel, the coating process will become more difficult.

[0004] Therefore, how to adjust the viscosity of the coating liquid during the transportation process is a technical problem that technical personnel in this field need to solve urgently.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The disclosed embodiments at least provide a nozzle for a liquid phase coating device for negative electrode materials of a lithium battery and a working method thereof.

[0007] In a first aspect, an embodiment of the present disclosure provides a nozzle for a liquid phase coating device for negative electrode materials of a lithium battery, which includes: a nozzle body; and a valve for adjusting the flow rate of the nozzle body; and a heating component suitable for adjusting the temperature of the spray in the nozzle body.

[0008] In an optional embodiment, the valve is arranged at the outlet of the nozzle body, the heating component is sleeved on the periphery of the nozzle body, a reflux mechanism is arranged on the nozzle body, and the valve and the heating component are connected by a linkage mechanism; a flow sensor connected to the control module is arranged in the nozzle body, and the flow sensor is used to obtain and send flow data in the nozzle body; wherein the control module is configured to judge the received flow data with a preset range value, and if it is lower than the range value, the linkage mechanism is controlled to adjust the opening of the valve to increase the flow, and at the same time drive the heating component to move toward the tube wall of the nozzle body to heat the coating liquid in the tube; and the control module is also configured to judge the received flow data with a preset range value, and if it is higher than the range value, the linkage mechanism is controlled to adjust the opening of the valve to reduce the flow, and at the same time drive the heating component to move away from the tube wall of the nozzle body and open the reflux mechanism, so that the coating liquid in the tube refluxes due to pressure.

[0009] In an optional embodiment, the reflux mechanism includes: a chamber, the bottom of which is connected to the nozzle body, and the side wall of the chamber is connected to the reflux pipe; a lifting plate, which is arranged in the chamber; a driving rod, one end of which extends into the chamber and is connected to the lifting plate, and the other end is connected to the heating component; wherein, when the received flow data is higher than a preset range value, the control module is configured to control the linkage mechanism to drive the heating component away from the nozzle body, and the driving rod follows the movement of the heating component to enable the lifting plate to open the reflux pipe.

[0010] In an optional embodiment, the heating assembly includes: a pair of arc-shaped heating plates; wherein the two heating plates are symmetrically arranged on the periphery of the nozzle body; and the driving rod is connected to one of the heating plates.

[0011] In an optional embodiment, the valve comprises: a pair of valve plates; the linkage mechanism comprises: a pair of linkage components; wherein the two linkage components are respectively connected to the corresponding valve plates and the corresponding heating plates.

[0012] In an optional embodiment, the linkage assembly includes: a driver, which is arranged on the tube wall of the nozzle body; a linkage rod, which is connected to the driving end of the driver, one end of the linkage rod is connected to the valve plate, and the other end is connected to the heating plate; wherein the control module is electrically connected to the driver, and is configured to drive the linkage rod to rotate by controlling the driver to adjust the height of the valve plate, that is, to adjust the flow rate in the nozzle body.

[0013] In an optional embodiment, the driving rod is connected to the heating plate via an "L"-shaped connecting rod; one end of the driving rod is hinged to one end of the connecting rod, and the other end is hinged to the lifting plate, and the other end of the connecting rod is connected to the heating plate.

[0014] In an optional embodiment, a waist-shaped hole for avoiding the driving rod is opened on the top of the chamber.

[0015] In an optional implementation, a telescopic rod is inserted into one end of the linkage rod facing the valve plate; the telescopic rod is hinged to the valve plate.

[0016] In the second aspect, the embodiment of the present disclosure also provides a working method of the nozzle for the liquid phase coating device of the negative electrode material of a lithium battery as described above, which includes: obtaining and sending the flow data in the nozzle body through a flow sensor; adjusting the flow of the nozzle body through a valve; adjusting the temperature of the coating liquid in the nozzle body through a heating component; judging the received flow data with a preset range value through a control module; when the received flow data belongs to the range value, the control module controls the linkage mechanism to adjust the opening of the valve to the preset opening; when the received flow data is lower than the range value, the control module controls the linkage mechanism to adjust the opening of the valve to increase the flow, and at the same time drives the heating component close to the tube wall of the nozzle body to heat the coating liquid in the tube; when the received flow data is higher than the range value, the control module controls the linkage mechanism to adjust the opening of the valve to reduce the flow, and at the same time drives the heating component away from the tube wall of the nozzle body and opens the reflux mechanism to make the coating liquid in the tube reflux due to pressure.

[0017] The beneficial effect of the present invention is that the liquid-phase coating device for negative electrode materials of lithium batteries uses a nozzle to collect flow data in the nozzle body to reflect the viscosity of the coating liquid, and adjusts the opening of the valve and the temperature compensation amount of the heating component according to the flow data, and the two are linked to ensure the viscosity and flow of the coating liquid; at the same time, when the viscosity of the coating liquid is too low, the reflux mechanism is triggered to open, and the coating liquid with too low viscosity is refluxed to prevent it from damaging the coating.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1A schematic diagram of the structure of a nozzle for a liquid phase coating device for a negative electrode material of a lithium battery provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic structural diagram of a nozzle for a liquid phase coating device for negative electrode materials of a lithium battery provided by an embodiment of the present disclosure when the nozzle is in a third state;

[0023] Figure 3 A schematic structural diagram of a nozzle for a liquid phase coating device for negative electrode materials of a lithium battery provided by an embodiment of the present disclosure when the nozzle is in a first state;

[0024] Figure 4 A schematic structural diagram of a nozzle for a lithium battery negative electrode material liquid phase coating device provided in an embodiment of the present disclosure when the nozzle is in a second state.

[0025] In the figure:

[0026] Nozzle body 1;

[0027] Valve 2, valve plate 21;

[0028] Heating assembly 3, heating plate 31;

[0029] Linkage mechanism 4, linkage assembly 41, driver 411, linkage rod 412, telescopic rod 413;

[0030] Reflux mechanism 5 , chamber 51 , reflux pipe 52 , lifting plate 53 , driving rod 54 , connecting rod 55 , waist-shaped hole 56 . DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, in the drawings, the thickness of the components may be exaggerated or reduced in order to effectively describe the technical content.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] like Figures 1 to 4As shown, at least one embodiment provides a nozzle for a liquid phase coating device for lithium battery negative electrode materials, which includes: a nozzle body 1; and a valve 2 for adjusting the flow of the nozzle body 1; and a heating component 3 suitable for adjusting the temperature of the spray in the nozzle body 1.

[0035] In some embodiments, the valve 2 is arranged at the outlet of the nozzle body 1, the heating component 3 is sleeved on the periphery of the nozzle body 1, a reflux mechanism 5 is arranged on the nozzle body 1, and the valve 2 and the heating component 3 are connected through a linkage mechanism 4; a flow sensor connected to the control module is arranged in the nozzle body 1, and the flow sensor is used to obtain and send flow data in the nozzle body 1; wherein the control module is electrically connected to the flow sensor and the linkage mechanism 4; the control module is configured to judge the received flow data with a preset range value, and if it is lower than the range value, the linkage mechanism 4 is controlled to adjust the opening of the valve 2 to increase the flow, and at the same time drive the heating component 3 to move toward the tube wall of the nozzle body 1 to heat the coating liquid in the tube; and the control module is also configured to judge the received flow data with a preset range value, and if it is higher than the range value, the linkage mechanism 4 is controlled to adjust the opening of the valve 2 to reduce the flow, and at the same time drive the heating component 3 to move away from the tube wall of the nozzle body 1 and open the reflux mechanism 5, so that the coating liquid in the tube refluxes due to pressure.

[0036] In this embodiment, the force that drives the coating liquid to flow is fixed, so when the viscosity of the coating liquid decreases, the flow rate in the nozzle body 1 will increase, and when the viscosity of the coating liquid increases, the flow rate in the nozzle body 1 will decrease. Therefore, the viscosity of the coating liquid in the nozzle body 1 can be judged according to the data collected by the flow sensor, and the viscosity of the coating liquid is determined by the temperature. Therefore, the viscosity of the coating liquid can be changed by adjusting the temperature of the nozzle body 1; wherein, a range value of the flow rate will be preset in the control module, and the range value is not only the flow rate required for coating, but also indicates that the viscosity of the coating liquid within the range value is qualified.

[0037] The working states of the nozzle used in the liquid phase coating device for lithium battery negative electrode materials can be divided into three types:

[0038] The first state: reference Figure 3 During the conveying process, if the flow data collected by the flow sensor is lower than the preset range value, it indicates that the flow of the nozzle body 1 has decreased, and it also indicates that the viscosity of the coating liquid is high. At this time, the control module controls the linkage mechanism 4 to adjust the valve 2 to the corresponding opening according to the acquired flow data to increase the flow, and to ensure that the flow of the nozzle body 1 is within the required range as much as possible; at the same time, in order to ensure the viscosity, the linkage mechanism 4 drives the heating component 3 to move while adjusting the opening of the valve 2, so that the heating component 3 is closer to the side wall of the nozzle body 1, that is, the temperature of the coating liquid is increased, thereby reducing the viscosity of the coating liquid.

[0039] Second state: reference Figure 4 During the conveying process, if the flow data collected by the flow sensor is higher than the preset range value, it indicates that the flow of the nozzle body 1 has increased, and it also indicates that the viscosity of the coating liquid is low. At this time, the control module controls the linkage mechanism 4 to adjust the valve 2 to the corresponding opening according to the acquired flow data to reduce the flow, and to ensure that the flow of the nozzle body 1 is within the required range as much as possible; at the same time, in order to ensure the viscosity, the linkage mechanism 4 drives the heating component 3 to move while adjusting the opening of the valve 2, so that the heating component 3 is away from the side wall of the nozzle body 1, that is, the temperature of the coating liquid is reduced, thereby increasing the viscosity of the coating liquid; wherein, the coating liquid with low viscosity cannot be coated, although the heating component 3 has been away from the nozzle body 1, but the temperature reduction is lagging, so the heating component 3 will drive the reflux mechanism 5 to open while moving away, at this time, due to the reduction in the opening of the valve 2, the pressure in the nozzle body 1 will increase, and the coating liquid with low viscosity will flow back to the melting warehouse from the reflux mechanism 5 due to the increase in the pressure in the tube.

[0040] The third state: reference Figure 2 During the conveying process, if the flow data collected by the flow sensor meets the preset range value, it indicates that the flow of the nozzle body 1 is qualified, and also indicates that the viscosity of the coating liquid is qualified. At this time, the control module controls the linkage mechanism 4 to adjust the valve 2 to the preset opening value according to the acquired flow data; therefore, the first state and the second state are both adjusted at the preset opening value, and the relationship between the opening value and the flow data is an inversely proportional function, that is, the larger the flow data, the smaller the opening value.

[0041] like Figure 2 As shown, in some embodiments, the reflux mechanism 5 includes: a chamber 51, the bottom of the chamber 51 is connected to the nozzle body 1, and the side wall of the chamber 51 is connected to the reflux pipe 52; a lifting plate 53, which is arranged in the chamber 51; a driving rod 54, one end of which extends into the chamber 51 and is connected to the lifting plate 53, and the other end is connected to the heating component 3; wherein the control module is configured to control the linkage mechanism 4 to drive the heating component 3 away from the nozzle body 1 when the received flow data is higher than the preset range value, while the driving rod 54 follows the movement of the heating component 3 to make the lifting plate 53 open the reflux pipe 52.

[0042] Specifically, the lifting plate 53 in the reflux mechanism 5 is linked to the heating component 3 through the driving rod 54. When the heating component 3 moves away from the nozzle body 1, the lifting plate 53 opens the reflux pipe 52. The greater the distance between the heating component 3 and the nozzle body 1, the larger the cross-sectional area of ​​the reflux pipe 52 opened by the lifting plate 53.

[0043] In some embodiments, the heating assembly 3 includes: a pair of arc-shaped heating plates 31 ; wherein the two heating plates 31 are symmetrically arranged on the periphery of the nozzle body 1 ; and the driving rod 54 is connected to one of the heating plates 31 .

[0044] Specifically, the heating plate 31 is used to perform temperature compensation for the coating liquid in the nozzle body 1. By moving closer to the nozzle body 1, the nozzle body 1 conducts heat to the coating liquid inside. The closer the heating plate 31 is, the more temperature compensation there is. Among them, in the third state, the position of the heating plate 31 provides temperature compensation for the coating liquid, the first state increases the temperature compensation, and the second state reduces the temperature compensation.

[0045] In some embodiments, the driving rod 54 is connected to the heating plate 31 through an “L”-shaped connecting rod 55 ; one end of the driving rod 54 is hinged to one end of the connecting rod 55 , and the other end is hinged to the lifting plate 53 , and the other end of the connecting rod 55 is connected to the heating plate 31 .

[0046] In some embodiments, a waist-shaped hole 56 for avoiding the driving rod 54 is opened on the top of the chamber 51; specifically, the driving rod 54 will deflect during the movement of the lifting plate 53, so the waist-shaped hole 56 needs to be provided for avoidance.

[0047] In some embodiments, the valve 2 includes: a pair of valve plates 21, and the distance between the two valve plates 21 indicates the opening of the valve 2; the linkage mechanism 4 includes: a pair of linkage components 41; wherein the two linkage components 41 are respectively connected to the corresponding valve plates 21 and the corresponding heating plates 31.

[0048] Specifically, the valve 2 is composed of two valve plates 21, and the heating component 3 is composed of two heating plates 31, so the linkage mechanism 4 is also composed of two linkage components 41, and one linkage component 41 controls one valve plate 21 and one heating plate 31; wherein, the control module controls the two linkage components 41 to act synchronously.

[0049] In some embodiments, the linkage assembly 41 includes: a driver 411, which is arranged on the tube wall of the nozzle body 1; a linkage rod 412, which is connected to the driving end of the driver 411, one end of the linkage rod 412 is connected to the valve plate 21, and the other end is connected to the heating plate 31; wherein, the control module is electrically connected to the driver 411, and is configured to drive the linkage rod 412 to rotate by controlling the driver 411 to adjust the height of the valve plate 21, that is, to adjust the flow rate in the nozzle body 1; optionally, the driver 411 adopts a servo motor.

[0050] Specifically, the control module controls the driver 411 to drive the linkage rod 412 to rotate to adjust the height of the valve plate 21, that is, changes the opening of the valve 2 and adjusts the flow in the nozzle body 1; at this time, the other end of the linkage rod 412 drives the heating plate 31 to move to change the amount of temperature compensation.

[0051] In some embodiments, a telescopic rod 413 is inserted into one end of the linkage rod 412 facing the valve plate 21;

[0052] The telescopic rod 413 is hinged to the valve plate 21 .

[0053] At least one embodiment also provides a working method of a nozzle for a liquid phase coating device for negative electrode materials of lithium batteries, which includes: obtaining and sending flow data in the nozzle body 1 through a flow sensor; adjusting the flow of the nozzle body 1 through a valve 2; adjusting the temperature of the coating liquid in the nozzle body 1 through a heating component 3; judging the received flow data with a preset range value through a control module; when the received flow data belongs to the range value, the control module controls the linkage mechanism 4 to adjust the opening of the valve 2 to the preset opening; when the received flow data is lower than the range value, the control module controls the linkage mechanism 4 to adjust the opening of the valve 2 to increase the flow, and at the same time drives the heating component 3 close to the tube wall of the nozzle body 1 to heat the coating liquid in the tube; when the received flow data is higher than the range value, the control module controls the linkage mechanism 4 to adjust the opening of the valve 2 to reduce the flow, and at the same time drives the heating component 3 away from the tube wall of the nozzle body 1 and opens the reflux mechanism 5 to allow the coating liquid in the tube to reflux due to pressure.

[0054] Regarding the specific structure and implementation process of the nozzle used in the liquid phase coating device for lithium battery negative electrode materials, please refer to the relevant discussion in the above embodiments, which will not be repeated here.

[0055] In summary, the liquid phase coating device for negative electrode materials of lithium batteries uses a nozzle to collect flow data in the nozzle body 1 to reflect the viscosity of the coating liquid, and adjusts the opening of the valve 2 and the temperature compensation amount of the heating component 3 according to the flow data, and the two are linked to ensure the viscosity and flow of the coating liquid; at the same time, when the viscosity of the coating liquid is too low, the reflux mechanism 5 is triggered to open, and the coating liquid with too low viscosity is refluxed to prevent it from damaging the coating.

[0056] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component, or a third component may be interposed between the first component and the second component.

[0057] In this article, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to another element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0058] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0059] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0060] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0061] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0063] Spatially relative terms, such as "inside", "outside", "below", "below", "down", "above", "on", etc., may be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figure. In addition to the orientation depicted in the figure, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented to be "above" other elements or features. Therefore, the example term "below" can cover the orientation above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0064] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0065] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A nozzle for a liquid phase coating device for a lithium battery negative electrode material, characterized in that: include: Nozzle body (1); and A valve (2) for adjusting the flow rate of the nozzle body (1); as well as A heating assembly (3) adapted to adjust the temperature of the sprayed material in the nozzle body (1); The valve (2) is arranged at the outlet of the nozzle body (1), the heating component (3) is sleeved on the periphery of the nozzle body (1), a reflux mechanism (5) is arranged on the nozzle body (1), and the valve (2) and the heating component (3) are connected via a linkage mechanism (4); A flow sensor connected to the control module is arranged in the nozzle body (1), and the flow sensor is used to obtain flow data in the nozzle body (1) and send it; in The control module is configured to compare the received flow data with a preset range value, and if the flow rate is lower than the range value, control the linkage mechanism (4) to adjust the opening of the valve (2) to increase the flow rate, and at the same time drive the heating component (3) to move toward the tube wall of the nozzle body (1) to heat the coating liquid in the tube; as well as The control module is further configured to compare the received flow data with a preset range value, and if the flow rate is higher than the range value, control the linkage mechanism (4) to adjust the opening of the valve (2) to reduce the flow rate, and at the same time drive the heating component (3) to move away from the tube wall of the nozzle body (1) and open the reflux mechanism (5), so that the coating liquid in the tube flows back to the melting chamber due to pressure; The reflux mechanism (5) comprises: A chamber (51), wherein the bottom of the chamber (51) is in communication with the nozzle body (1), and the side wall of the chamber (51) is in communication with the return pipe (52); A lifting plate (53) is arranged in the chamber (51); A driving rod (54), one end of which extends into the chamber (51) and is connected to the lifting plate (53), and the other end of which is connected to the heating component (3); The control module is configured to, when the received flow data is higher than a preset range value, control the linkage mechanism (4) to drive the heating component (3) away from the nozzle body (1), while the driving rod (54) moves along with the heating component (3) to enable the lifting plate (53) to open the return pipe (52); The heating assembly (3) comprises: a pair of arc-shaped heating plates (31); The two heating plates (31) are symmetrically arranged on the periphery of the nozzle body (1); The driving rod (54) is connected to one of the heating plates (31); The valve (2) comprises: a pair of valve plates (21); The linkage mechanism (4) comprises: a pair of linkage components (41); wherein The two linkage components (41) are respectively connected to the corresponding valve plate (21) and the corresponding heating plate (31); The linkage component (41) comprises: A driver (411) is arranged on the tube wall of the nozzle body (1); A linkage rod (412) connected to a driving end of the driver (411); one end of the linkage rod (412) is connected to the valve plate (21), and the other end is connected to the heating plate (31); The control module is electrically connected to the driver (411) and is configured to drive the linkage rod (412) to rotate by controlling the driver (411) so as to adjust the height of the valve plate (21), that is, to adjust the flow rate in the nozzle body (1); The driving rod (54) is connected to the heating plate (31) via an "L"-shaped connecting rod (55); One end of the driving rod (54) is hinged to one end of the connecting rod (55), and the other end is hinged to the lifting plate (53); the other end of the connecting rod (55) is connected to the heating plate (31); The top of the chamber (51) is provided with a waist-shaped hole (56) for avoiding the driving rod (54); A telescopic rod (413) is inserted into one end of the linkage rod (412) facing the valve plate (21); The telescopic rod (413) is hinged to the valve plate (21).

2. A method for operating the nozzle for the liquid phase coating device for lithium battery negative electrode materials as claimed in claim 1, characterized in that: include: Acquiring flow data in the nozzle body (1) through a flow sensor and sending the data; The flow rate of the nozzle body (1) is adjusted by means of a valve (2); The temperature of the coating liquid in the nozzle body (1) is adjusted by a heating component (3); The received flow data is judged against a preset range value by the control module; When the received flow data belongs to the range value, the control module controls the linkage mechanism (4) to adjust the opening of the valve (2) to a preset opening; When the received flow data is lower than the range value, the control module controls the linkage mechanism (4) to adjust the opening of the valve (2) to increase the flow rate, and at the same time drives the heating component (3) to be close to the tube wall of the nozzle body (1) to heat the coating liquid in the tube; When the received flow data is higher than the range value, the control module controls the linkage mechanism (4) to adjust the opening of the valve (2) to reduce the flow rate, and at the same time drives the heating component (3) away from the tube wall of the nozzle body (1) and opens the reflux mechanism (5), so that the coating liquid in the tube flows back to the melting chamber due to pressure.

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