Jet mill for lithium battery cathode material and pipeline assembly

Abstract

The utility model belongs to the field of crushers, and particularly relates to a jet mill for a lithium battery negative electrode material and a pipeline assembly, the jet mill for the lithium battery negative electrode material comprises a feeding air pipe, a plurality of tangential inclined through holes are formed in one section of annular side wall of the feeding air pipe, the inclined through hole is suitable for introducing air flow into the feeding air pipe to form forward rotating air flow, a material opening of the hopper is connected with the feeding air pipe and located at a lower air opening of the inclined through hole, and when the air flow is introduced into the feeding air pipe to blow materials, the rotating air flow synchronously blows fine material particles attached to the inner wall of the feeding air pipe. According to the feeding device, the tangential inclined through holes are formed in the feeding air pipe, air flow is introduced into the inclined through holes to form forward rotating air flow in the pipe, and the feeding opening of the feeding air pipe is formed in the lower air openings of the inclined through holes, so that the effect that fine material particles attached to the inner wall of the feeding air pipe are blown through the rotating air flow is achieved; and the feeding stability is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of pulverizers, and in particular relates to an airflow pulverizer and pipeline assembly for lithium battery negative electrode materials. Background Technology

[0002] Lithium-ion battery anode materials are mainly divided into carbon materials and non-carbon materials. Carbon materials include graphite-based and amorphous carbon, with graphite-based anode materials being the most widely used. Non-carbon materials include silicon-based anode materials and lithium titanate anode materials. These materials are generally first processed using an air jet mill to pulverize them before being incorporated into subsequent lithium-ion battery production.

[0003] When feeding materials into an air jet mill, the material is sent into the grinding chamber through the feeding duct. However, the state of the material before grinding is varied, and some powdery material may also be present. Since the airflow direction of the feeding duct is radial, when fine particles of powdery material adhere to the inner wall of the feeding duct, the radial airflow does not easily blow them off, resulting in a reduction in the amount of material fed and affecting the stability of the feeding process.

[0004] Therefore, it is urgent to design an air jet mill for lithium battery anode materials to solve the technical problem of fine particles of the above-mentioned powder materials adhering to the inner wall of the feeding duct, resulting in poor feeding stability.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0006] This disclosure provides at least one airflow pulverizer for lithium battery anode materials.

[0007] In a first aspect, the present disclosure provides a one-way valve for preventing valve core vibration, comprising: a feeding air duct adapted to allow airflow to blow materials, wherein a plurality of tangential oblique through holes are provided on a section of annular sidewall of the feeding air duct, the oblique through holes being adapted to allow airflow to be introduced into the feeding air duct to form a forward rotating airflow;

[0008] The hopper has its feed inlet connected to the feed duct and located at the lower air outlet of the inclined through hole;

[0009] The crushing chamber is located at the air outlet end of the feeding air duct;

[0010] When the material is blown into the feeding duct by airflow, the rotating airflow simultaneously blows the fine material particles attached to the inner wall of the feeding duct.

[0011] In one optional embodiment, the outer wall of the feeding duct is provided with an annular air cavity;

[0012] The oblique through hole connects the annular air cavity and the feeding air duct.

[0013] In one alternative embodiment, the annular air cavity is connected to an air inlet pipe;

[0014] An air pump is installed at the air inlet end of the air inlet pipe.

[0015] In one alternative embodiment, the hopper is positioned above the feeding duct;

[0016] A hopper is provided above the hopper so that the material enters the feeding duct under its own gravity.

[0017] In one optional embodiment, a blower is provided at the air inlet end of the feeding duct;

[0018] The pulverizing chamber is connected to a pulverizing air pump via a pipe, and the pulverizing air pump is adapted to deliver pulverizing gas into the pulverizing chamber.

[0019] The crushing chamber is also connected to a collection chamber via another pipe, the collection chamber being adapted to collect the crushed material.

[0020] Secondly, this disclosure also provides an airflow pulverizer, including: a feeding duct with an oblique through hole, so that after airflow is introduced into the oblique through hole, a rotating airflow is formed in the feeding duct;

[0021] The hopper has its feed inlet connected to the feed duct and is located downstream of the rotating airflow;

[0022] When the main pipe of the feeding air duct is vented with airflow to blow materials, the oblique through-hole vents vent airflow to form a rotating airflow.

[0023] In one alternative embodiment, each of the oblique through holes is tangentially formed along the annular sidewall of the feeding duct.

[0024] In one optional embodiment, the outer wall of the feeding duct is provided with an annular air cavity;

[0025] The oblique through-hole connects the annular air cavity and the feeding air duct; and

[0026] The annular air cavity is connected to an air inlet pipe;

[0027] An air pump is installed at the air inlet end of the air inlet pipe.

[0028] Thirdly, this disclosure also provides a pipeline assembly for an airflow pulverizer, including: a feeding duct, which is adapted to introduce airflow to blow materials, wherein a plurality of tangential oblique through holes are provided on a section of annular sidewall of the feeding duct, and the oblique through holes are adapted to introduce airflow into the feeding duct to form a forward rotating airflow.

[0029] The hopper, connected to the feeding duct, is suitable for conveying materials to the feeding duct; among which...

[0030] Compared to the oblique through-hole, the material enters the feeding duct at the rear of the airflow direction.

[0031] In one optional embodiment, the outer wall of the feeding duct is provided with an annular air cavity;

[0032] The oblique through hole connects the annular air cavity and the feeding air duct;

[0033] The annular air cavity is connected to an air inlet pipe;

[0034] The air intake end of the air intake pipe is connected to an air pump.

[0035] The beneficial effect of this utility model is that by opening several tangential oblique holes in the feeding air duct and introducing airflow into the oblique holes, a forward rotating airflow is formed inside the duct. By setting the feeding air duct inlet at the downwind end of the oblique holes, the rotating airflow blows the fine material particles attached to the inner wall of the feeding air duct, thereby further improving the stability of feeding.

[0036] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0037] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 A cross-sectional schematic diagram of an air jet mill for lithium battery anode materials provided in an embodiment of this disclosure;

[0040] Figure 2 This is a perspective view of an airflow pulverizer for lithium battery anode materials provided in an embodiment of this disclosure.

[0041] In the picture:

[0042] 1. Feeding duct; 11. Angled through hole; 12. Annular air cavity; 13. Air inlet pipe; 14. Blower;

[0043] 2. Hopper;

[0044] 3. Grinding chamber;

[0045] 4. Air pump;

[0046] 5. Silo;

[0047] 6. Crushing air pump;

[0048] 7. Collection bin. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0050] Research has revealed that lithium-ion battery anode materials are primarily categorized into carbon materials and non-carbon materials. Carbon materials include graphite-based and amorphous carbon, with graphite-based anode materials currently being more widely used. Non-carbon materials include silicon-based anode materials and lithium titanate anode materials. These materials are typically first processed using an air jet mill to pulverize them before being incorporated into subsequent lithium-ion battery production.

[0051] When feeding materials into an air jet mill, the material is sent into the grinding chamber through the feeding duct. However, the state of the material before grinding is varied, and some powdery material may also be present. Since the airflow direction of the feeding duct is radial, when fine particles of powdery material adhere to the inner wall of the feeding duct, the radial airflow does not easily blow them off, resulting in a reduction in the amount of material fed and affecting the stability of the feeding process.

[0052] Therefore, it is urgent to design an air jet mill for lithium battery anode materials to solve the technical problem of fine particles of the above-mentioned powder materials adhering to the inner wall of the feeding duct, resulting in poor feeding stability.

[0053] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0054] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0055] Based on the above research, and in order to solve the aforementioned technical problems, refer to Figure 1 At least one embodiment provides an airflow pulverizer for lithium battery negative electrode materials, including: a feeding duct 1, a hopper 2, and a pulverizing chamber 3. The hopper 2 is disposed above the feeding duct 1, and its inlet is connected to the feeding duct 1. A hopper 5 for storing materials is disposed above the hopper 2. The hopper 5 is connected to the feeding duct 1 through the hopper 2, so that the material in the hopper 5 enters the feeding duct 1 under its own gravity. The feeding duct 1 is adapted to introduce airflow to blow materials, and its outlet end is provided with a pulverizing chamber 3, which is adapted to receive and pulverize materials. To remove fine material particles adhering to the inner wall of the feeding duct 1, a number of tangential oblique through holes 11 are provided on a section of the annular sidewall of the feeding duct 1. The oblique through holes 11 are suitable for introducing airflow into the feeding duct 1 to form a forward rotating airflow. It should be noted that the material inlet of the hopper 2 is located at the lower air outlet of the oblique through hole 11 when it connects to the feeding duct 1. Therefore, when the feeding duct 1 introduces airflow to blow material, the rotating airflow simultaneously blows away the fine material particles adhering to the inner wall of the feeding duct 1. Through the arrangement of the above components, the effect of blowing away the fine material particles adhering to the inner wall of the feeding duct 1 with rotating airflow is achieved, which significantly improves the stability of feeding.

[0056] Reference Figure 2 In some embodiments, to receive the pulverized material, the pulverizing chamber 3 is connected to a collection chamber 7 via a pipe. The collection chamber 7 is suitable for collecting the pulverized material. Notably, the pulverizing chamber 3 is also connected to a pulverizing air pump 6 via another pipe. The pulverizing air pump 6 is suitable for supplying pulverizing gas into the pulverizing chamber 3 to achieve the effect of pulverizing the material. The air inlet end of the feeding duct 1, which supplies material to the pulverizing chamber 3, is equipped with a blower 14. The blower 14 is suitable for introducing airflow into the feeding duct 1, through which the material is sent into the pulverizing chamber 3.

[0057] Reference Figure 1 and Figure 2 In some embodiments, in order to introduce airflow into the oblique through-hole 11, an annular air cavity 12 is provided on the outer wall of the feeding air duct 1. The annular air cavity 12 is connected to the air inlet pipe 13. An air pump 4 is provided at the air inlet end of the air inlet pipe 13. The air pump 4 is adapted to introduce airflow into the air inlet pipe 13 so that the airflow enters the annular air cavity 12. Since the tangential oblique through-hole 11 connects the annular air cavity 12 and the feeding air duct 1, the airflow further enters the feeding air duct 1 through the tangential oblique through-hole 11 and forms a forward rotating airflow to achieve the effect of blowing the fine material particles attached to the inner wall of the feeding air duct 1.

[0058] Reference Figure 1 and Figure 2At least one embodiment provides an airflow pulverizer, including: a feeding duct 1 and a hopper 2. The hopper 2 is disposed above the feeding duct 1, and its inlet is connected to the feeding duct 1. The hopper 2 is adapted to feed material to the feeding duct 1. The feeding duct 1 is adapted to introduce airflow to blow material. A plurality of tangential oblique through holes 11 are opened on a section of the annular sidewall of the feeding duct 1, and the oblique through holes 11 are located at the upper air outlet of the hopper 2. The oblique through holes 11 are adapted to introduce airflow to form a forward rotating airflow in the feeding duct 1. The rotating airflow blows the fine material particles attached to the inner wall of the feeding duct 1 downstream. It is worth mentioning that an annular air cavity 12 is provided on the outer wall of the feeding duct 1. The annular air cavity 12 is connected to an air inlet pipe 13. An air pump 4 is provided at the air inlet end of the air inlet pipe 13. The air pump 4 is adapted to introduce airflow into the air inlet pipe 13 so that the airflow enters the annular air cavity 12. Since the tangential oblique through hole 11 connects the annular air cavity 12 and the feeding duct 1, the airflow further enters the feeding duct 1 through the tangential oblique through hole 11 and forms a forward rotating airflow. Through the arrangement of the above components, the effect of blowing the fine material particles attached to the inner wall of the feeding duct 1 with rotating airflow is achieved, which improves the stability of feeding.

[0059] Reference Figure 1 and Figure 2 At least one embodiment provides a piping assembly for an airflow pulverizer, including: a feeding duct 1 and a hopper 2. The feeding duct 1 is adapted to allow airflow to blow materials. A plurality of tangential oblique holes 11 are provided on a section of the annular sidewall of the feeding duct 1. An annular air cavity 12 is provided on the outer sidewall of the feeding duct 1. The tangential oblique holes 11 connect the annular air cavity 12 and the feeding duct 1. The annular air cavity 12 is also connected to an air inlet pipe 13. An air pump 4 is provided at the air inlet end of the air inlet pipe 13. The air pump 4 is adapted to blow materials into the airflow. Airflow is introduced through the air inlet pipe 13 so that the airflow enters the annular air chamber 12. The airflow further enters the feeding air duct 1 through the tangential oblique through hole 11 and forms a forward rotating airflow. The hopper 2 is connected to the feeding air duct 1 and is suitable for conveying materials to the feeding air duct 1. Relative to the oblique through hole 11, the position where the material enters the feeding air duct 1 is located behind the airflow direction. Therefore, the aforementioned forward rotating airflow will blow away the fine material particles attached to the inner wall of the feeding air duct 1, effectively improving the stability of feeding.

[0060] As used herein, the phrases “at least one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., 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. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0061] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0062] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0063] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An airflow pulverizer for lithium battery negative electrode materials, characterized in that, include: The feeding air duct (1) is suitable for introducing airflow to blow materials. A number of tangential oblique through holes (11) are opened on a section of the annular sidewall of the feeding air duct (1). The oblique through holes (11) are suitable for introducing airflow into the feeding air duct (1) to form a forward rotating airflow. The hopper (2) has its feed inlet connected to the feed air pipe (1) and located at the lower air outlet of the inclined through hole (11); The crushing chamber (3) is located at the air outlet of the feeding air duct (1); When the feeding air duct (1) is vented with airflow to blow materials, the rotating airflow simultaneously blows the fine material particles attached to the inner wall of the feeding air duct (1).

2. The airflow pulverizer for lithium battery negative electrode materials as described in claim 1, characterized in that, The outer wall of the feeding air duct (1) is provided with an annular air cavity (12). The oblique through hole (11) connects the annular air cavity (12) and the feeding air duct (1).

3. The airflow pulverizer for lithium battery negative electrode materials as described in claim 2, characterized in that, The annular air cavity (12) is connected to the air inlet pipe (13); An air pump (4) is provided at the air inlet end of the air inlet pipe (13).

4. The airflow pulverizer for lithium battery negative electrode materials as described in claim 1, characterized in that, The hopper (2) is positioned above the feeding air duct (1); A hopper (5) is provided above the hopper (2) so that the material enters the feeding duct (1) under its own gravity.

5. The airflow pulverizer for lithium battery negative electrode materials as described in claim 1, characterized in that, A blower (14) is provided at the air inlet end of the feeding air duct (1). The pulverizing chamber (3) is connected to the pulverizing air pump (6) through a pipe, and the pulverizing air pump (6) is adapted to deliver pulverizing gas into the pulverizing chamber (3); The crushing chamber (3) is also connected to the collection chamber (7) through another pipe, the collection chamber (7) being adapted to collect the crushed material.

6. An airflow pulverizer, characterized in that, include: The feeding duct (1) has an oblique through hole (11) so that after the airflow is introduced into the oblique through hole (11), a rotating airflow is formed in the feeding duct (1); The hopper (2) has its feed inlet connected to the feed duct (1) and is located downstream of the rotating airflow; When the main pipe of the feeding air duct (1) is vented with airflow to blow materials, the oblique through hole (11) is vented with airflow to form a rotating airflow.

7. The airflow pulverizer according to claim 6, characterized in that, Each of the oblique through holes (11) is tangentially opened along the feeding air pipe (1) on its annular sidewall.

8. The airflow pulverizer according to claim 6, characterized in that, The outer wall of the feeding air duct (1) is provided with an annular air cavity (12). The oblique through hole (11) connects the annular air cavity (12) and the feeding air duct (1); and The annular air cavity (12) is connected to the air inlet pipe (13); An air pump (4) is provided at the air inlet end of the air inlet pipe (13).

9. A piping assembly for an airflow pulverizer, characterized in that, include: The feeding air duct (1) is suitable for introducing airflow to blow materials. A number of tangential oblique through holes (11) are opened on a section of the annular sidewall of the feeding air duct (1). The oblique through holes (11) are suitable for introducing airflow into the feeding air duct (1) to form a forward rotating airflow. The hopper (2) is connected to the feeding duct (1) and is suitable for conveying materials to the feeding duct (1); in Relative to the oblique through hole (11), the material enters the feeding air duct (1) at the rear of the airflow direction.

10. The piping assembly as claimed in claim 9, characterized in that, The outer wall of the feeding air duct (1) is provided with an annular air cavity (12). The oblique through hole (11) connects the annular air cavity (12) and the feeding air duct (1); The annular air cavity (12) is connected to the air inlet pipe (13); The air intake pipe (13) is connected to the air pump (4) at the air intake end.

Images