CN216573335U

CN216573335U - A reducing mechanism for lithium cell cathode material

Info

Publication number: CN216573335U
Application number: CN202121796411.8U
Authority: CN
Inventors: 谢香兰; 肖水龙; 李斌斌; 陈志荣
Original assignee: JIANGXI KINGLI TECHNOLOGY CO LTD
Current assignee: JIANGXI KINGLI TECHNOLOGY CO LTD
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-05-24
Anticipated expiration: 2031-08-03

Abstract

The utility model relates to the technical field of lithium battery production, and provides a crushing device for a lithium battery anode material. The method comprises the steps of firstly, pre-crushing large-particle lithium iron phosphate through rotary grinding to reduce the particle size of the lithium iron phosphate, and then crushing the lithium iron phosphate with the reduced particle size into a fine-particle product meeting the particle size requirement through jet milling; the rotary grinding has good crushing effect on large-particle lithium iron phosphate, low energy consumption and production cost, high efficiency of air flow crushing, small and uniform granularity of the obtained product and good quality. The utility model improves the crushing efficiency of the lithium iron phosphate, improves the productivity, greatly reduces the production cost, has high crushing quality, and obtains products with small granularity, stable density and stable performance.

Description

A reducing mechanism for lithium cell cathode material

Technical Field

The utility model relates to the technical field of lithium battery production, in particular to a crushing device for a lithium battery anode material.

Background

The lithium ion battery as a new generation of green high-energy battery has the advantages of high voltage, large energy density, good cycle performance, small self-discharge, no memory effect, wide working temperature range and the like, and is widely applied. Lithium iron phosphate is a hot spot of current research as a new-generation lithium ion battery anode material due to low price, high theoretical capacity, stable working voltage, no toxicity, environmental protection, stable structure, good safety, good thermal stability and ultra-long cycle life.

The production flow of the lithium ion battery is as follows: the preparation method comprises the steps of material preparation, dispersion grinding, spray drying, granulation, sintering, crushing, drying and the like. The crushing step generally adopts mechanical crushing, the operation is simple, but the crushing quality of the mechanical crushing is poor, the granularity of the obtained product is large, the distribution is wide, the density is unstable, the performance of the lithium iron phosphate product is unstable, the crushing efficiency is low, and the productivity is small. The large-particle coarse products are treated by jet milling, so that the energy consumption is high, and the production cost is greatly increased.

Disclosure of Invention

The utility model aims to overcome at least one of the defects in the prior art, and provides the lithium battery positive electrode material crushing device which is efficient, stable, good in crushing quality and low in cost. The purpose of the utility model is realized based on the following technical scheme:

the utility model provides a crushing device for a lithium battery anode material, which comprises a first feeding device, a pre-crushing device, a second feeding device and an airflow crushing device which are sequentially connected, wherein the first feeding device is used for conveying a lithium iron phosphate granular product obtained by sintering to the pre-crushing device for pre-crushing to obtain a lithium iron phosphate crude product, and the second feeding device is used for conveying the lithium iron phosphate crude product to the airflow crushing device for airflow crushing; the pre-crushing device comprises a first feeding hole, a grinding chamber, a rotary grinding tool, a grinding table and a discharging hole, wherein the first feeding hole is used for receiving lithium iron phosphate granular products conveyed by the first feeding device, the rotary grinding tool and the grinding table are positioned in the grinding chamber and are combined to be used for carrying out rotary grinding on the lithium iron phosphate granular products to obtain lithium iron phosphate coarse products, and the discharging hole is used for discharging the obtained lithium iron phosphate coarse products to the second feeding device; the second feeding device is a vacuum feeding device and comprises a material pipe, a vacuum pump and a vacuum pipeline, one end of the material pipe is connected with a discharge port of the pre-crushing device, the other end of the material pipe is connected with the airflow crushing device, the vacuum pump is connected with the airflow crushing device through the vacuum pipeline, and the vacuum pump and the vacuum pipeline are used for vacuumizing the interior of the airflow crushing device, so that a lithium iron phosphate rough product enters the airflow crushing device through the material pipe to be subjected to airflow crushing.

Preferably, the fluid energy milling device is including smashing chamber and separator, it is equipped with a plurality of nozzles that are used for spraying high velocity air to smash the intracavity, the nozzle is located on the coplanar, the lateral wall of smashing the chamber is equipped with the second feed inlet with the material pipe, the second feed inlet is in coplanar and its central extension converges in a bit with the nozzle, the upper end of smashing the chamber still is equipped with hierarchical turbine, drive arrangement is connected to one side of hierarchical turbine, and the ejection of compact pipeline is connected to the opposite side, the ejection of compact pipeline is connected with the separator, the separator passes through vacuum pipe connection vacuum pump, the mounting height of vacuum pipe on the separator is greater than the mounting height of ejection of compact pipeline.

Preferably, a product outlet is arranged below the separator, and a grading wheel is arranged at the product outlet.

Preferably, the second feeding device further comprises a feeding nozzle, and the feeding nozzle is arranged between the material pipe and the second feeding hole and is used for jetting high-speed airflow to convey the lithium iron phosphate coarse product in the material pipe to the second feeding hole.

Preferably, the first feeding device comprises a driving machine and a conveying device driven by the driving machine to operate.

Preferably, the driving machine comprises a motor and a speed reducer in transmission connection with the motor, the conveying device comprises a driving wheel, a driven wheel and a plurality of scraping plates, the speed reducer is in transmission connection with the driving wheel, the driving wheel is connected with the driven wheel through a transmission device, and the scraping plates are arranged on the transmission device.

Preferably, the transmission is a chain or a belt.

Preferably, the first feeding device is further provided with a shell.

Preferably, a material guide plate is further arranged between the first feeding device and the first feeding hole.

Preferably, a storage chamber communicated with the grinding chamber is further arranged below the grinding chamber, and the discharge port is arranged at the lower end of the storage chamber.

The utility model can achieve at least one of the following beneficial effects:

1. the method comprises the steps of firstly, pre-crushing large-particle lithium iron phosphate through rotary grinding to reduce the particle size of the lithium iron phosphate, and then crushing the lithium iron phosphate with the reduced particle size into a fine-particle product meeting the particle size requirement through jet milling; the rotary grinding has good crushing effect on large-particle lithium iron phosphate, low energy consumption and production cost, high efficiency of air flow crushing, small and uniform granularity of the obtained product and good quality. The utility model improves the crushing efficiency of the lithium iron phosphate, improves the productivity, greatly reduces the production cost, has high crushing quality, and obtains products with small granularity, stable density and stable performance.

2. According to the utility model, a proper feeding device is selected according to the granularity of the lithium iron phosphate, and scraper plate feeding is used for granular products, so that the lithium iron phosphate granular material feeding device has the characteristics of long service life, stable operation, small structural size, large conveying capacity, low energy consumption, low material breakage rate and the like; the vacuum feeding is used for coarse products with smaller particles, and has the advantages of dust-free conveying, economy, energy conservation and environmental protection, and the soft landing particles of the materials are not damaged and the materials are not bonded, thereby being beneficial to improving the productivity.

Drawings

Fig. 1 is a schematic structural view of a pulverizing apparatus for a positive electrode material of a lithium battery according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural diagram of the first feeding device 1 according to the preferred embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and fig. 2, a crushing device for a lithium battery positive electrode material according to a preferred embodiment of the present invention includes a first feeding device 1, a pre-crushing device 2, a second feeding device 3, and an airflow crushing device 4, which are sequentially connected, where the first feeding device 1 is configured to convey a sintered lithium iron phosphate granular product to the pre-crushing device 2 for pre-crushing to obtain a lithium iron phosphate coarse product, and the second feeding device 3 is configured to convey the lithium iron phosphate coarse product to the airflow crushing device 4 for airflow crushing. The pre-crushing device 2 comprises a first feeding hole 21, a grinding chamber 22, a rotary grinding tool 23, a grinding table 24 and a discharging hole 25, wherein the first feeding hole 21 is used for receiving lithium iron phosphate granular products conveyed by the first feeding device 1, the rotary grinding tool 23 and the grinding table 24 are located in the grinding chamber 22, the combination of the rotary grinding tool and the grinding table is used for performing rotary grinding on the lithium iron phosphate granular products to obtain lithium iron phosphate coarse products, and the discharging hole 25 is used for discharging the obtained lithium iron phosphate coarse products to the second feeding device 3. The rotary grinding has good crushing effect on large-particle lithium iron phosphate, and has low energy consumption and production cost. The second feeding device 3 is a vacuum feeding device, and includes a material pipe 31, a vacuum pump 32 and a vacuum pipeline 33. The vacuum feeding process has the advantages of dust-free conveying, easy cleaning, economy, energy conservation, low noise and environmental protection, the good working environment is favorable for improving the productivity, and the soft landing particles of the materials are not damaged and the materials are not adhered. One end of the material pipe 31 is connected with the discharge port 25 of the pre-crushing device 2, the other end of the material pipe is connected with the airflow crushing device 4, the vacuum pump 32 is connected with the airflow crushing device 4 through the vacuum pipeline 33, and the vacuum pump 32 and the vacuum pipeline 33 are used for vacuumizing the interior of the airflow crushing device 4, so that a lithium iron phosphate crude product enters the airflow crushing device 4 through the material pipe 31 to be subjected to airflow crushing.

In this embodiment, the fluid energy milling device 4 includes a milling chamber 41 and a separator 42, a plurality of nozzles 43 for jetting high-speed air flow are arranged in the milling chamber 41, the nozzles 43 are arranged on the same plane, a second feeding hole 44 connected with the material pipe 31 is arranged on the side wall of the milling chamber 41, the second feeding hole 44 and the nozzles 43 are arranged on the same plane, and the central extension line of the second feeding hole and the central extension line converge at one point, so as to achieve high-speed fluid energy milling of the coarse product. The upper end of the crushing cavity 41 is also provided with a grading turbine 45, one side of the grading turbine 45 is connected with a driving device 46, the other side of the grading turbine 45 is connected with a discharge pipeline 47, and the discharge pipeline 47 is connected with the separator 42. The product obtained by jet milling is separated into coarse and fine materials under the action of strong centrifugal force generated by the grading turbine 45, and fine particles meeting the particle size requirement enter the separator 42 through the discharge pipe 47. The separator 42 is also connected to a vacuum pump 32 through a vacuum pipe 33, a negative pressure is obtained by continuously pumping air to realize the transportation of the product between the crushing chamber 41 and the separator 42, and the installation height of the vacuum pipe 33 on the separator 42 is larger than that of the discharge pipe 47, so that the product falls to be collected. A filter element can be arranged at the joint of the vacuum pipeline 33 and the separator 42 to prevent powder from being discharged from the vacuum pipeline. A product outlet 48 is arranged below the separator 42, a grading wheel 49 is arranged at the product outlet 48, and the arrangement of the grading wheel 49 can ensure the negative pressure condition in the device while discharging.

The second feeding device 3 further includes a feeding nozzle 34, the feeding nozzle 34 is disposed between the material pipe 31 and the second feeding hole 44, and is configured to spray a high-speed airflow to deliver the coarse lithium iron phosphate product in the material pipe 31 to the second feeding hole 44, so as to accelerate the transportation and pulverization process of the coarse lithium iron phosphate product.

In the present embodiment, the first feeding device 1 comprises a driving machine 11 and a conveying device 12 driven by the driving machine 11; the driving machine 11 comprises a motor 13 and a speed reducer 14 in transmission connection with the motor 13, the conveying device 12 comprises a driving wheel 15, a driven wheel 16 and a plurality of scraping plates 17, the speed reducer 14 is in transmission connection with the driving wheel 15, the driving wheel 15 is connected with the driven wheel 16 through a transmission device 18, and the scraping plates 17 are arranged on the transmission device 18. The transmission device 18 may be a chain or a belt; the first feeding device 1 may further be provided with a housing 19 in which the conveying device 12 is installed, so that the entry of foreign substances can be prevented. The feeding device has the advantages of simple structure, convenient operation, capability of inclined conveying within the range of 150 degrees, stable operation, small structural size, large conveying capacity, low energy consumption, low material breakage rate, no influence of cargo loading bulk degree and humidity on the conveying capacity and the like.

In this embodiment, a material guiding plate 26 is further disposed between the first feeding device 1 and the first feeding hole 21 to facilitate the particle products to be crushed to enter the grinding chamber. The lower part of the grinding chamber 22 is also provided with a storage chamber 27 communicated with the grinding chamber, and the discharge hole 25 is arranged at the lower end of the storage chamber 27, so that the coarse products can be conveniently collected.

The working principle of the utility model is as follows:

the motor 13 is started, the driving wheel 15 is driven to rotate under the action of the speed reducer 14, the rotation of the driving wheel 15 drives the driven wheel 16 to rotate through the transmission device 18, and therefore the scraper 17 loaded with the lithium iron phosphate granular products is driven to convey forwards. When the iron phosphate is conveyed to the end of the driven wheel 16, the granular product falls from the scraper 17, is guided by the material guide plate 26 to enter the grinding chamber 22 through the first feeding hole 21, finally falls on the grinding table 24, then the power device of the rotary grinding tool 23 is started to grind the granular product, and the obtained crude lithium iron phosphate product is stored in the storage chamber 27. The coarse product is discharged from the discharge port 25 and enters the second feed port 44 through the feed pipe 31. Compressed air is filtered and dried, and then is injected into the crushing cavity 41 at a high speed through the nozzle 43, a coarse product is repeatedly collided, rubbed and sheared at the intersection point of a plurality of high-pressure air flows to be crushed, the crushed material moves to the grading turbine 45 along with an ascending air flow under the suction action of the fan, under the action of strong centrifugal force generated by the grading turbine 45 rotating at a high speed, the coarse and fine materials are separated, coarse particles fall to a crushing area to be continuously crushed, the fine particle product meeting the particle size requirement enters the separator 42 to be collected, and the fine particle product is discharged through the grading wheel 49 at the product outlet 48.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. The crushing device for the lithium battery anode material is characterized by comprising a first feeding device (1), a pre-crushing device (2), a second feeding device (3) and an airflow crushing device (4) which are sequentially connected, wherein the first feeding device (1) is used for conveying a lithium iron phosphate granular product obtained by sintering to the pre-crushing device (2) for pre-crushing to obtain a lithium iron phosphate coarse product, and the second feeding device (3) is used for conveying the lithium iron phosphate coarse product to the airflow crushing device (4) for airflow crushing; the pre-crushing device (2) comprises a first feeding hole (21), a grinding chamber (22), a rotary grinding tool (23), a grinding table (24) and a discharging hole (25), wherein the first feeding hole (21) is used for receiving lithium iron phosphate granular products conveyed by the first feeding device (1), the rotary grinding tool (23) and the grinding table (24) are positioned in the grinding chamber (22) and are combined to be used for carrying out rotary grinding on the lithium iron phosphate granular products to obtain lithium iron phosphate crude products, and the discharging hole (25) is used for discharging the obtained lithium iron phosphate crude products to the second feeding device (3); second loading attachment (3) are vacuum feeding device, including material pipe (31), vacuum pump (32) and vacuum pipe (33), the one end of material pipe (31) is connected with discharge gate (25) of breaker (2) in advance, and the other end is connected with fluid energy milling device (4), vacuum pump (32) are connected with fluid energy milling device (4) through vacuum pipe (33), vacuum pump (32) and vacuum pipe (33) are used for the inside evacuation to fluid energy milling device (4) to make the crude product of lithium iron phosphate carry out the jet break in getting into fluid energy milling device (4) via material pipe (31).

2. The crushing device for the lithium battery cathode material according to claim 1, wherein the air flow crushing device (4) comprises a crushing cavity (41) and a separator (42), a plurality of nozzles (43) for jetting high-speed air flow are arranged in the crushing cavity (41), the nozzles (43) are arranged on the same plane, a second feeding hole (44) of the material pipe (31) is formed in the side wall of the crushing cavity (41), the second feeding hole (44) and the nozzles (43) are arranged on the same plane, the central extension line of the second feeding hole and the central extension line of the nozzles converge at one point, a grading turbine (45) is further arranged at the upper end of the crushing cavity (41), one side of the grading turbine (45) is connected with a driving device (46), the other side of the grading turbine is connected with a discharging pipeline (47), the discharging pipeline (47) is connected with the separator (42), and the separator (42) is connected with a vacuum pump (32) through a vacuum pipeline (33), the installation height of the vacuum pipeline (33) on the separator (42) is larger than that of the discharge pipeline (47).

3. The crushing device for the lithium battery positive electrode material according to claim 2, wherein a product outlet (48) is arranged below the separator (42), and a grading wheel (49) is arranged at the product outlet (48).

4. The crushing device for the lithium battery cathode material according to claim 2, wherein the second feeding device (3) further comprises a feeding nozzle (34), and the feeding nozzle (34) is arranged between the material pipe (31) and the second feeding hole (44) and is used for jetting high-speed air flow to convey the lithium iron phosphate coarse product in the material pipe (31) to the second feeding hole (44).

5. The crushing device for a lithium battery positive electrode material according to claim 1, characterized in that the first feeding device (1) comprises a driving machine (11) and a conveying device (12) driven by the driving machine (11).

6. The crushing device for the lithium battery cathode material is characterized in that the driving machine (11) comprises a motor (13) and a speed reducer (14) in transmission connection with the motor (13), the conveying device (12) comprises a driving wheel (15), a driven wheel (16) and a plurality of scraping plates (17), the speed reducer (14) is in transmission connection with the driving wheel (15), the driving wheel (15) is connected with the driven wheel (16) through a transmission device (18), and the scraping plates (17) are arranged on the transmission device (18).

7. The crushing device for a lithium battery positive electrode material according to claim 6, wherein the transmission device (18) is a chain or a belt.

8. A crushing device for positive electrode material of lithium battery according to claim 6, characterized in that the first feeding device (1) is further provided with a casing (19).

9. The crushing device for the lithium battery cathode material according to claim 1, wherein a material guide plate (26) is further arranged between the first feeding device (1) and the first feeding hole (21).

10. The crushing device for the lithium battery positive electrode material according to claim 1, wherein a storage chamber (27) communicated with the lower part of the grinding chamber (22) is further provided, and the discharge port (25) is provided at the lower end of the storage chamber (27).