Lithium battery negative electrode material liquid phase coating device with premixing function

Abstract

The utility model belongs to the technical field of lithium batteries, and in particular relates to a lithium battery negative electrode material liquid phase coating device with a premixing function, which comprises a coating barrel, a pre-mixing device and a liquid phase coating device, the stirring mechanism is arranged in the coating barrel; the premixing mechanism comprises a first nozzle, a second nozzle and a third nozzle; and a guide plate. Wherein the first nozzle, the second nozzle and the third nozzle are sequentially arranged above the material guide plate; the first nozzle and the third nozzle are both connected with the coating barrel so that materials in the coating barrel can be conveyed to the material guide plate. According to the liquid phase coating device, the negative electrode material is sprayed into two layers of coating liquid for premixing, the traditional mode that a large number of negative electrode materials are directly fed into a coating barrel is replaced, the coating efficiency is improved, and the coating efficiency is improved. And the occurrence of agglomeration of the negative electrode material is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and in particular relates to a lithium battery negative electrode material liquid phase coating device with a premixing function. Background Art

[0002] Graphite occupies a dominant position in the negative electrode material system of lithium-ion batteries due to its advantages such as low cost, abundant reserves, high specific capacity, low lithium insertion and extraction platform and long cycle life.

[0003] According to relevant technologies, in order to modify the negative electrode material, a liquid phase coating method is generally adopted to form a thin film or coating on the surface of the negative electrode material.

[0004] However, the coating liquid has a certain viscosity. When the negative electrode material of the lithium battery is put into the coating liquid, it is easy to clump in the coating liquid, resulting in uneven coating.

[0005] Therefore, how to prevent the negative electrode material from agglomerating in the coating solution is a technical problem that technical personnel in this field need to solve urgently. Utility Model Content

[0006] In order to solve the technical problems mentioned in the background technology, the utility model provides a liquid phase coating device for lithium battery negative electrode materials with a premixing function, which includes: a coating barrel; a stirring mechanism, arranged in the coating barrel; and a premixing mechanism, which includes: a first nozzle, a second nozzle and a third nozzle; and a material guide plate; wherein the first nozzle, the second nozzle and the third nozzle are arranged in sequence above the material guide plate; the first nozzle and the third nozzle are both connected to the coating barrel to convey the material in the coating barrel to the material guide plate; the second nozzle is connected to the negative electrode material bin to convey the negative electrode material in the negative electrode material bin to the material guide plate, so that the negative electrode material is wrapped in the material.

[0007] Furthermore, the heights of the first nozzle, the second nozzle and the third nozzle are sequentially decreased.

[0008] Furthermore, the lengths of the first nozzle and the third nozzle are equal; and the length of the second nozzle is shorter than that of the first nozzle.

[0009] Furthermore, the first nozzle and the third nozzle are arranged on the same return pipe.

[0010] Furthermore, the reflux pipe is connected to the bottom of the coating barrel.

[0011] Furthermore, the stirring mechanism comprises: a stirrer and a breaking up barrel; the coating barrel, the breaking up barrel and the stirrer are coaxially arranged, and the breaking up barrel is located at the periphery of the stirrer.

[0012] Furthermore, the inlet of the reflux pipe is located at the periphery of the beating barrel.

[0013] Furthermore, a pump body is arranged on the reflux pipe.

[0014] The beneficial effect of the utility model is that the liquid phase coating device for negative electrode materials of lithium batteries with premixing function sprays the negative electrode materials into two layers of coating liquid for premixing, replacing the traditional method of directly putting a large amount of negative electrode materials into the coating barrel, thereby effectively reducing the occurrence of agglomeration of negative electrode materials.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the liquid phase coating device for lithium battery negative electrode materials with pre-mixing function;

[0019] Figure 2 1 is a side view structural schematic diagram of the premixing mechanism;

[0020] Figure 3 1 is a schematic diagram of the top view of the premixing mechanism;

[0021] Figure 4 It is a structural schematic diagram of the stirring mechanism.

[0022] In the figure:

[0023] Coating barrel 1;

[0024] Stirring mechanism 2, stirrer 21, breaking bucket 22;

[0025] Premixing mechanism 3, first nozzle 31, second nozzle 32, third nozzle 33;

[0026] Guide plate 4;

[0027] Negative electrode material compartment 5;

[0028] Reflux pipe 6, pump body 61. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 As shown, at least one embodiment provides a liquid-phase coating device for negative electrode materials of lithium batteries with a premixing function, which includes: a coating barrel 1; a stirring mechanism 2, which is arranged in the coating barrel 1; and a premixing mechanism 3, which includes: a first nozzle 31, a second nozzle 32 and a third nozzle 33; and a material guide plate 4; wherein the first nozzle 31, the second nozzle 32 and the third nozzle 33 are sequentially arranged above the material guide plate 4; the first nozzle 31 and the third nozzle are both connected to the coating barrel 1 to transport the material in the coating barrel 1 to the material guide plate 4; the second nozzle 32 is connected to the negative electrode material bin 5 to transport the negative electrode material in the negative electrode material bin 5 to the material guide plate 4, so that the negative electrode material is wrapped in the material.

[0031] In some embodiments, the negative electrode material is sprayed into the two layers of coating liquid for premixing, instead of directly putting a large amount of negative electrode material into the coating barrel 1 in the traditional way, which effectively reduces the occurrence of agglomeration of the negative electrode material.

[0032] like Figure 4 As shown, in some embodiments, a proper amount of coating liquid is contained in the coating barrel 1 for mixing with the negative electrode material; a stirring mechanism 2 is arranged in the coating barrel 1 for fully mixing the coating liquid and the negative electrode material in the coating barrel 1; specifically, the stirring mechanism 2 includes an agitator 21 and a scrambling barrel 22, the coating barrel 1, the scrambling barrel 22 and the agitator 21 are coaxially arranged, and the scrambling barrel 22 is located at the periphery of the agitator 21, and a plurality of through holes are opened on the scrambling barrel 22 to facilitate the internal mixed material to pass through, wherein the agitator 21 and the scrambling barrel 22 are respectively controlled by independent drivers so that the two rotate in opposite directions.

[0033] like Figure 2 As shown, in some embodiments, the guide plate 4 is arranged at an angle to guide the received pre-mixed material into the coating barrel 1 for mixing.

[0034] like Figure 1 , Figure 2As shown, in some embodiments, the negative electrode material bin 5 is used to store the negative electrode material; the related technology is to directly put all the required negative electrode materials into the coating barrel 1, but this method will cause the negative electrode material to accumulate on the coating liquid, resulting in easy agglomeration during the stirring process. At the same time, the negative electrode material will be blown away and lifted by the stirrer during the initial stirring process; therefore, this scheme pre-mixes the negative electrode material and the coating liquid to reduce the incidence of agglomeration and the generation of lifting.

[0035] Specifically, the reflux pipe 6 sprays the coating liquid in the coating barrel 1 from the first nozzle 31 and the third nozzle 33 through the pump body 61, wherein the first nozzle 31 and the third nozzle 33 are arranged above the guide plate 4 and arranged front and back along the length direction of the guide plate 4, so that the first nozzle 31 first sprays the coating liquid on the guide plate 4, and then the coating liquid sprayed by the third nozzle 33 covers the coating liquid sprayed by the first nozzle 31 and sliding down. At the same time, the second nozzle 32 arranged between the first nozzle 31 and the third nozzle 33 sprays the negative electrode material in the negative electrode material bin 5 onto the coating liquid sprayed by the first nozzle 31. At this time, due to the viscosity of the coating liquid, the negative electrode material will be adsorbed to prevent the negative electrode material from being lifted up. Subsequently, the negative electrode material on the surface of the coating liquid is covered by the coating liquid sprayed by the third nozzle 33 and falls into the coating barrel 1 together. The use of this pre-mixing method can not only effectively reduce the occurrence of agglomeration of the negative electrode material, but also prevent the negative electrode material from being lifted up.

[0036] like Figure 3 As shown, in some embodiments, the heights of the first nozzle 31 , the second nozzle 32 , and the third nozzle 33 are sequentially decreased to adapt to the inclined material guide plate 4 .

[0037] In some embodiments, the lengths of the first nozzle 31 and the third nozzle 33 are equal; the length of the second nozzle 32 is shorter than that of the first nozzle 31; the second nozzle 32 is set shorter to enable the ejected negative electrode material to completely land on the coating liquid.

[0038] In some embodiments, the first nozzle 31 and the third nozzle 33 are disposed on the same return pipe 6 .

[0039] In some embodiments, the reflux pipe 6 is connected to the bottom of the coating barrel 1; the inlet of the reflux pipe 6 is located at the periphery of the scrambling barrel 22; in the initial stage, there is only coating liquid in the coating barrel 1, so the first nozzle 31 and the third nozzle 33 only spray out the coating liquid, and as the negative electrode material enters the coating barrel 1 and is stirred, the coating liquid sprayed by the first nozzle 31 and the third nozzle 33 will also contain negative electrode material.

[0040] In summary, the present lithium battery negative electrode material liquid phase coating device with premixing function sprays the negative electrode material into two layers of coating liquid for premixing, replacing the traditional method of directly putting a large amount of negative electrode material into the coating barrel 1, thereby effectively reducing the occurrence of negative electrode material agglomeration.

[0041] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0042] 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 it can be indirectly connected 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.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A liquid phase coating device for lithium battery negative electrode materials with a premixing function, characterized in that: include: Coated barrel (1); A stirring mechanism (2) is arranged in the coating barrel (1); and A premixing mechanism (3), comprising: a first nozzle (31), a second nozzle (32) and a third nozzle (33); and A guide plate (4); wherein The first nozzle (31), the second nozzle (32) and the third nozzle (33) are sequentially arranged above the material guide plate (4); The first nozzle (31) and the third nozzle are both connected to the coating barrel (1) so as to transport the material in the coating barrel (1) to the material guide plate (4); The second nozzle (32) is connected to the negative electrode material bin (5) to transport the negative electrode material in the negative electrode material bin (5) onto the material guide plate (4), so that the negative electrode material is wrapped in the material.

2. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 1, characterized in that: The heights of the first nozzle (31), the second nozzle (32) and the third nozzle (33) decrease in sequence.

3. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 2, characterized in that: The first nozzle (31) and the third nozzle (33) are of equal length; The length of the second nozzle (32) is shorter than the length of the first nozzle (31).

4. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 3, characterized in that: The first nozzle (31) and the third nozzle (33) are arranged on the same return pipe (6).

5. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 4, characterized in that: The reflux pipe (6) is connected to the bottom of the coating barrel (1).

6. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 5, characterized in that: The stirring mechanism (2) comprises: a stirrer (21) and a beating barrel (22); The coating barrel (1), the breaking barrel (22) and the stirrer (21) are coaxially arranged, and the breaking barrel (22) is located outside the stirrer (21).

7. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 6, characterized in that: The inlet of the reflux pipe (6) is located at the periphery of the beating barrel (22).

8. The liquid phase coating device for lithium battery negative electrode materials with premixing function as claimed in claim 7, characterized in that: A pump body (61) is provided on the reflux pipe (6).

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