Hot air drying system for lithium iron phosphate battery raw materials

Abstract

The utility model discloses a lithium iron phosphate battery raw material hot air drying system, which comprises a box body, a hot air assembly, a dryer, an air pump and a plurality of vibrating plates, during working, raw materials are placed in a hopper, under the action of a nozzle, the raw materials in the hopper continuously bubble and roll to be preheated and continuously guided into the box body, the raw materials sequentially pass through the plurality of vibrating plates, and the raw materials are dried by a drying machine. In the sliding process on the vibrating plate, the nozzle continuously blows hot air to dry the raw materials, the vibrating plate is provided with an electric heating device which cooperates with vibration of the vibrating plate to achieve the stir-frying effect on the raw materials, then the raw materials enter the discharging port, and under driving of the air pump, water vapor generated by drying is dehydrated after passing through the dryer. And waste heat is guided to the discharging opening again, recycling of the waste heat can be achieved, the drying effect is further improved, and the overall drying efficiency of the lithium iron phosphate battery raw materials is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of production and processing of lithium iron phosphate batteries and relates to a hot air drying system for lithium iron phosphate battery raw materials. Background Art

[0002] In the production and processing of lithium iron phosphate batteries, the moisture content of the finished lithium iron phosphate cathode material directly affects the battery's electrochemical performance. Therefore, the moisture content must be strictly controlled, generally within 500ppm. Due to the fine particle size and large specific surface area of lithium iron phosphate powder, it is highly absorbent. If exposed to air for even a short time or in high humidity, its moisture content can exceed 1000ppm. Currently, the most common method for reducing the water content in lithium iron phosphate is to remove water through electric heating and baking. This process typically involves a batch heating, heating, and cooling process in a baking oven. However, this process is time-consuming, has low drying efficiency, and operates in a harsh environment. Utility Model Content

[0003] The purpose of the utility model is to provide a hot air drying system for lithium iron phosphate battery raw materials, which effectively improves the drying efficiency of lithium iron phosphate battery raw materials.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A hot air drying system for lithium iron phosphate battery raw materials, comprising a box body, a hot air component, a dryer, an air pump and several vibration plates, wherein a hopper is provided on the top of the box body and a discharge port is provided at the bottom thereof, the box body is provided with an exhaust port, a filter is provided at the exhaust port, the hot air component is suitable for outputting hot air and a plurality of nozzles are connected to its output end, the plurality of vibration plates are built into the box body, the vibration plates are equipped with an electric heating device, the plurality of vibration plates are staggered up and down and tilted downward, one end of the vibration plate receives material from above and the other end outputs material, the uppermost vibration plate receives material from the hopper, the output end of the lowermost vibration plate is connected to the discharge port, the plurality of nozzles are suitable for blowing toward the inner lower part of the hopper and the upper surface of the vibration plate, the dryer is connected to the exhaust port, the input end of the air pump is connected to the dryer, and the output end of the air pump is connected to the top of the discharge port through a pipeline.

[0006] Furthermore, the plurality of nozzles are symmetrically mounted on the inner lower portion of the hopper and are symmetrically oriented.

[0007] Furthermore, a plurality of the nozzles are installed on the inner top of the box and face the nearest vibration plate, and a plurality of the nozzles are installed on the bottom of the upper vibration plate and face the upper surface of the lower vibration plate.

[0008] Furthermore, the inclination angle of the vibration plate to the horizontal plane is 20-40 degrees.

[0009] Furthermore, a vector angle between the outlet direction of the pipeline and the extending direction of the discharge port is 40-70 degrees.

[0010] Furthermore, the vector angle between the outlet direction of the pipeline and the extension direction of the discharge port is 55±2 degrees.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The hot air drying system of the present invention includes a box body, a hot air component, a dryer, an air pump and several vibration plates. When working, the raw materials are placed in the hopper. Under the action of the nozzle, the raw materials in the hopper are continuously bubbled and rolled for preheating, and are continuously guided into the box body. The raw materials pass through multiple vibration plates in sequence. During the sliding process on the vibration plates, the nozzles continuously blow hot air to dry the raw materials. The vibration plates themselves are provided with electric heating devices, which cooperate with their own vibrations to achieve the stir-frying effect of the raw materials. After that, the raw materials enter the discharge port. Driven by the air pump, the water vapor generated by the drying is dehydrated after passing through the dryer, and the residual heat is redirected to the discharge port. The residual heat can also be reused, further improving the drying effect, and effectively improving the overall drying efficiency of lithium iron phosphate battery raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort, among which:

[0014] Figure 1 This is a structural schematic diagram of a hot air drying system for lithium iron phosphate battery raw materials according to an embodiment of the present utility model.

[0015] Markings in the figure:

[0016] 10- box body; 11- hopper; 12- discharge port; 13- exhaust port; 14- filter;

[0017] 20-hot air component;

[0018] 30-dryer;

[0019] 40-air pump; 41-pipeline;

[0020] 50-vibration plate; 51-electric heating device. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

[0023] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0024] As described in the background technology, in the production and processing of lithium iron phosphate batteries, since the water content of the finished lithium iron phosphate product, which is the positive electrode material, directly affects the electrochemical performance of the battery, the water content of the lithium iron phosphate must be strictly controlled, and is generally required to be controlled within 500ppm. Since lithium iron phosphate powder has fine particles and a large specific surface area, it has a strong water absorption capacity. If it is exposed to the air for a long time or the ambient humidity is high, its water content will exceed 1000ppm. The current method for reducing the water content in lithium iron phosphate is generally to perform electric heating and baking to remove water. Most of its working methods are to perform heating, heating, and cooling processes in an intermittent baking furnace, but this operation method is time-consuming, has low drying efficiency, and has a harsh operating environment.

[0025] Based on this, the inventors created a hot air drying system for lithium iron phosphate battery raw materials in the present application to solve the above technical problems.

[0026] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0027] Example

[0028] See also Figure 1 A hot air drying system for lithium iron phosphate battery raw materials includes a housing 10, a hot air assembly 20, a dryer 30, an air pump 40, and a plurality of vibrating plates 50. The housing 10 is provided with a hopper 11 at the top and a discharge port 12 at the bottom. The housing 10 is provided with an exhaust port 13, and a filter 14 is provided at the exhaust port 13. For example, the hopper 11 may also be provided with a regulating valve to adjust the flow rate of the introduced raw materials. For example, the number of exhaust ports 13 can be multiple to better recover water vapor with residual heat. Here, the filter 14 is used to block the raw materials and prevent them from entering the dryer 30.

[0029] The hot air component 20 is suitable for outputting hot air and a plurality of nozzles are connected to its output end. The plurality of vibration plates 50 are built into the box body 10. The vibration plates 50 are equipped with electric heating devices 51. The plurality of vibration plates 50 are staggered up and down and tilted downward. In this way, the raw materials can slide down along the tilt direction of the vibration plate 50 under the action of their own vibration and gravity. In the process of sliding down, they are dried with hot air and "stir-fried". The drying effect is significantly improved. One end of the vibration plate 50 receives the material from above and the other end outputs the material. The uppermost vibration plate 50 receives the material from the hopper 11, and the output end of the lowermost vibration plate 50 is connected to the discharge port 12. For example, the number of vibration plates 50 is not limited. It can be two or three or more. It can be set accordingly according to the actual drying requirements of the raw materials.

[0030] The nozzles are adapted to blow air toward the lower inner portion of the hopper 11 and the upper surface of the vibrating plate 50. The dryer 30 is connected to the exhaust port 13. The input end of the air pump 40 is connected to the dryer 30, and the output end of the air pump 40 is connected to the top of the discharge port 12 via a pipe 41. This allows the water vapor with residual heat inside the housing 10 to pass through the dryer 30 and be blown toward the discharge port 12, accelerating the discharge and drying of the raw materials.

[0031] The hot air drying system of the present invention includes a box body 10, a hot air component 20, a dryer 30, an air pump 40 and a plurality of vibration plates 50. When working, the raw materials are placed in the hopper 11. Under the action of the nozzle, the raw materials in the hopper 11 are continuously bubbled and rolled for preheating, and are continuously guided into the box body 10. The raw materials pass through multiple vibration plates 50 in sequence. During the sliding process on the vibration plates 50, the nozzles continuously blow hot air to dry the raw materials. The vibration plates 50 themselves are provided with electric heating devices 51, which cooperate with their own vibrations to achieve a stir-frying effect on the raw materials. After that, the raw materials enter the discharge port 12. Driven by the air pump 40, the water vapor generated by drying passes through the dryer 30 and is dehydrated. The residual heat is redirected to the discharge port 12, and the residual heat can also be reused to further improve the drying effect, thereby effectively improving the overall drying efficiency of lithium iron phosphate battery raw materials.

[0032] In another embodiment, multiple nozzles are symmetrically mounted on the inner lower portion of the hopper 11 and oriented symmetrically. This arrangement allows for opposite blowing between the nozzles, resulting in a better drying effect. Preferably, multiple nozzles are mounted on the inner top of the housing 10 and face the nearest vibrating plate 50, while multiple nozzles are mounted on the bottom of the upper vibrating plate 50 and face the upper surface of the lower vibrating plate 50.

[0033] In another embodiment, the vibration plate 50 is inclined at an angle of 20-40 degrees to the horizontal plane. Practice has shown that this angle allows the raw materials to be dried for a long time and ensures smooth sliding.

[0034] In another embodiment, the vector angle between the outlet direction of the duct 41 and the extension direction of the discharge port 12 is 40-70 degrees. This arrangement ensures that the residual hot air has a component in the same direction as the raw material at the discharge port 12, accelerating the outflow of the raw material, while the perpendicular component further dries the raw material. Preferably, the vector angle between the outlet direction of the duct 41 and the extension direction of the discharge port 12 is 55±2 degrees.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hot air drying system for lithium iron phosphate battery raw materials, characterized in that: It includes a box body, a hot air component, a dryer, an air pump and several vibration plates. The top of the box body is provided with a hopper and the bottom is provided with a discharge port. The box body is provided with an exhaust port. A filter is provided at the exhaust port. The hot air component is suitable for outputting hot air and its output end is connected to several nozzles. The several vibration plates are built into the box body. The vibration plates are equipped with electric heating devices. The several vibration plates are staggered up and down and tilted downward. One end of the vibration plate receives the material from the top and the other end outputs the material. The uppermost vibration plate receives the material from the hopper. The output end of the lowermost vibration plate is connected to the discharge port. The several nozzles are suitable for blowing toward the inner lower part of the hopper and the upper surface of the vibration plate. The dryer is connected to the exhaust port, the input end of the air pump is connected to the dryer, and the output end of the air pump is connected to the top of the discharge port through a pipeline.

2. A hot air drying system for lithium iron phosphate battery raw materials according to claim 1, characterized in that: The plurality of nozzles are symmetrically mounted on the inner lower portion of the hopper and are symmetrically oriented.

3. A hot air drying system for lithium iron phosphate battery raw materials according to claim 2, characterized in that: A plurality of nozzles are installed on the inner top of the box body and face the nearest vibration plate, and a plurality of nozzles are installed on the bottom of the upper vibration plate and face the upper surface of the lower vibration plate.

4. A hot air drying system for lithium iron phosphate battery raw materials according to claim 1, characterized in that: The inclination angle of the vibration plate to the horizontal plane is 20-40 degrees.

5. The hot air drying system for lithium iron phosphate battery raw materials according to claim 1, characterized in that: The vector angle between the outlet direction of the pipeline and the extension direction of the discharge port is 40-70 degrees.

6. A hot air drying system for lithium iron phosphate battery raw materials according to claim 1, characterized in that: The vector angle between the outlet direction of the pipeline and the extension direction of the discharge port is 55±2 degrees.

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