Powder anti-explosion spraying device for lithium ion production

Abstract

The utility model discloses a powder explosion-proof spraying device for lithium ion production, which comprises a metering tank, a blanking pipe for blanking powder into the metering tank is arranged on the metering tank, the blanking pipe comprises a first blanking pipe communicated with the metering tank and a second blanking pipe with a valve, and the first blanking pipe is communicated with the metering tank. A certain distance is formed between the outlet end of the second blanking pipe and the inlet end of the first blanking pipe, the outlet end of the second blanking pipe and the inlet end of the first blanking pipe are in flexible connection through a flexible substance, the flexible connection structure comprises an inner layer and an outer layer, the inner layer is made of an airtight flexible substance, and the outer layer is a breathable film-covered filter bag capable of intercepting powder. According to the device provided by the utility model, material control can be enhanced so as to reduce dead materials, so that the possibility of occurrence of a pain point problem of a lithium ion battery homogenizing process, namely powder spraying, is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery production, in particular to a powder explosion-proof spraying device for lithium ion production. Background Art

[0002] The working principle of lithium-ion batteries is mainly based on the movement of lithium ions between the positive and negative electrodes, a process that includes the embedding and de-embedding of lithium ions. In the charging state, lithium ions are released from the positive electrode, pass through the electrolyte, and embed into the negative electrode, making the negative electrode in a lithium-rich state. During discharge, lithium ions are released from the negative electrode and return to the positive electrode through the electrolyte again. This movement process is accompanied by the flow of electrons, generating current for the device to use.

[0003] Lithium-ion batteries embed lithium ions into carbon (petroleum coke and graphite) to form a negative electrode (traditional lithium batteries use lithium or lithium alloy as the negative electrode). LixCoO2 is commonly used as the positive electrode material, and LixNiO2 and LixMnO4 are also used. The electrolyte is LiPF6+diethylene carbonate (EC)+dimethyl carbonate (DMC). Petroleum coke and graphite are non-toxic and abundant in resources as negative electrode materials. Lithium ions are embedded in carbon, which overcomes the high activity of lithium and solves the safety problems of traditional lithium batteries. The positive electrode LixCoO2 can achieve a high level in charge and discharge performance and life, which reduces costs. In short, the comprehensive performance of lithium-ion batteries is improved.

[0004] Patent document CN220460541U discloses a lithium-ion battery processing and mixing device, including a box body, a stirring mechanism, and a crushing mechanism. A feed port and a driving mechanism are arranged on the top of the box body. The driving mechanism includes a motor, a fixing frame and a stirring shaft. The fixing frame is fixedly connected to the top of the box body, the fixing frame is fixedly connected to the outside of the motor, the top of the stirring shaft is fixedly connected to the output shaft of the motor, a second stirring box and two first stirring boxes are arranged inside the box body, the two first stirring boxes are symmetrical about the stirring shaft, the second stirring box is located on the bottom inner wall of the box body and is fixedly connected to the box body, and the stirring shaft passes through the top of the box body and the top of the second stirring box.

[0005] However, in the preparation process of lithium-ion batteries, especially in the homogenization process for the positive electrode iron lithium and the negative electrode graphite, if there are problems such as pipeline bridging and poor storage bin ventilation during the loading process to the storage bin, it is very likely to cause the soft connection to rupture and then the powder will spread all over the workshop, requiring a long time of production suspension for cleaning, causing great economic losses. Utility Model Content

[0006] The utility model aims to provide a powder explosion-proof spraying device for lithium ion production, which can enhance material control to reduce dead material, thereby reducing the possibility of powder spraying, a pain point problem in the lithium ion battery slurry process.

[0007] In order to achieve the purpose of the utility model, the following technical solution is provided: a powder explosion-proof spray device for lithium ion production, comprising a metering tank, on which is provided a drop pipe for dropping powder into the metering tank, the drop pipe comprising a first drop pipe connected to the metering tank and a second drop pipe with a valve, the outlet end of the second drop pipe and the inlet end of the first drop pipe are spaced apart and connected by a flexible structure, the soft connection structure comprises an inner layer and an outer layer, the inner layer is made of an airtight flexible material, and the outer layer is made of a film filter bag material that is airtight but can retain powder.

[0008] Specifically, the inner layer of the soft connection structure is made of silicone material to prevent powder from being sprayed out due to long-term wear and cracking of the soft connection.

[0009] Specifically, the filtration accuracy of the membrane filter bag used in the outer layer of the soft connection structure is no more than 0.3 μm, which will not affect the metering accuracy and can also prevent accidental losses caused by single protection failure.

[0010] Specifically, two ends of the soft connection structure are fixed to the outlet end of the second blanking pipe and the inlet end of the first blanking pipe through throat hoops respectively.

[0011] Specifically, the drop pipe is arranged on the top surface of the metering tank, and the first drop pipe and the second drop pipe are arranged vertically.

[0012] Specifically, the valve on the second blanking pipe is a butterfly valve.

[0013] Specifically, a back-blowing filter is further provided on the top surface of the metering tank, a back-blowing pipe is provided on the back-blowing filter, and a back-blowing exhaust valve is provided on the back-blowing pipe.

[0014] Specifically, the back-blow pipe includes a first back-blow pipe connected to the back-blow filter and a second back-blow pipe provided with the back-blow exhaust valve. The outlet end of the second back-blow pipe and the inlet end of the first back-blow pipe are spaced apart and flexibly connected by silicone. The stress-free silicone soft connection can prevent the vibration of the upper air hammer from affecting the metering accuracy of the lower tank body.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] By setting up a drop pipe to modify the operating logic of the feeding system and adding a material anti-mistake method, the possibility of powder spraying, a pain point in the lithium battery slurry process, can be reduced, thereby reducing the waste of raw materials, cleaning labor of personnel, and production line shutdown losses caused by accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the powder explosion-proof spraying device provided in this embodiment;

[0018] Figure 2 A schematic diagram of the assembly of the first drop tube and the second drop tube provided in this embodiment;

[0019] Figure 3 for Figure 2 A cross-sectional view of the connecting part;

[0020] In the figure, 1, metering tank; 2, back-blowing filter; 3, silica gel; 4, back-blowing exhaust valve; 5, drop pipe; 5-1, butterfly valve; 5-2, second drop pipe; 5-3, first drop pipe; 5-4, throat clamp; 5-5, coated filter bag; 6, differential pressure transmitter. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figure 1 As shown, the powder explosion-proof spraying device provided in this embodiment includes a metering tank 1, and the metering tank 1 is provided with a feeding pipe 5 for feeding powder into the metering tank 1;

[0023] A back-blowing filter 2 is provided on the top surface of the metering tank 1 flush with the blanking pipe 5, a back-blowing pipe is provided on the back-blowing filter 2, the back-blowing pipe and the back-blowing filter 2 are softly connected by silica gel 3, a back-blowing exhaust valve 4 is provided on the back-blowing pipe, and a differential pressure transmitter 6 is provided to detect the pressure state of the silo in the metering tank 1.

[0024] like Figure 2 As shown, the specific structure of the drop pipe provided in this embodiment includes a first drop pipe 5-3 connected to the metering tank and a second drop pipe 5-2 with a valve, the outlet end of the second drop pipe 5-2 is at a certain distance from the inlet end of the first drop pipe 5-3 and is softly connected by a flexible material.

[0025] The second blanking pipe 5-2 adopts a butterfly valve 5-1 to control its blanking action.

[0026] like Figure 3 As shown, it is a cross-sectional view between the outlet end of the second drop pipe 5-2 and the inlet end of the first drop pipe 5-3, which includes an inner layer and an outer layer, and is fixed to the outlet end of the second drop pipe 5-2 and the inlet end of the first drop pipe 5-3 by a throat clamp 5-4. The inner layer is airtight silica gel 3, and the outer layer is a membrane filter bag 5-5 that is breathable but can retain powder, and the filtration accuracy of the membrane filter bag 5-5 is not more than 0.3μm. There is no interference between the upper and lower parts to ensure the metering accuracy, and at the same time prevent accidental losses caused by failure of a single protection.

[0027] The working process of the existing equipment is: after the central control establishes the feeding task, the blanking butterfly valve and the exhaust valve are opened, and the internal pressure of the silo is less than 2Bar, then the task proceeds normally.

[0028] The working process of the powder explosion-proof spray device is as follows: After the central control establishes the feeding task, the back-blowing filter exhaust valve 4 will open, and the code will be scanned to operate the crane to load the ton bag. When the exhaust valve in place signal of the back-blowing filter exhaust valve 4 is received, the butterfly valve 5-1 is allowed to open to prevent the powder from falling into the tank body, causing excessive positive pressure inside the tank body, making it difficult for the powder to fall, or even breaking the soft connection to cause dust leakage. The powder enters the metering tank 1 through the drop pipe 5; the differential pressure transmitter 6 monitors the pressure state of the warehouse body in real time. When problems such as powder bridging or back-blowing filter element clogging occur, resulting in poor exhaust, and the pressure reaches the set upper limit of 200mbar, the signal will be fed back to the control cabinet in real time to output an alarm instruction - that is, the butterfly valve 5-1 is closed to stop the drop, and the central control alarm prompts, effectively avoiding the possibility of powder explosion.

[0029] The utility model mainly reduces the possibility of leakage of lithium-ion battery materials from two perspectives: prevention of occurrence and discharge, through the coordination of work logic optimization and hardware improvement, thereby reducing the losses caused by personnel cleaning labor, scrapped raw materials and production line shutdown after the accident.

[0030] In addition, the terms "upper", "lower", "inner", "outer", "front", "rear" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0031] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0032] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A powder explosion-proof spraying device for lithium ion production, comprising a metering tank, wherein the metering tank is provided with a feeding pipe for feeding powder into the metering tank, characterized in that: The drop pipe includes a first drop pipe connected to the metering tank and a second drop pipe with a valve. The outlet end of the second drop pipe and the inlet end of the first drop pipe are spaced apart and connected by a flexible structure. The soft connection structure includes an inner layer and an outer layer. The inner layer is made of an airtight flexible material, and the outer layer is made of a membrane filter bag material that is airtight but can retain powder.

2. The powder explosion-proof spraying device for lithium ion production according to claim 1, characterized in that: The inner layer of the soft connection structure is made of silicone.

3. The powder explosion-proof spraying device for lithium ion production according to claim 1, characterized in that: The filtration accuracy of the membrane filter bag used in the outer layer of the soft connection structure is not greater than 0.3μm.

4. The powder explosion-proof spraying device for lithium ion production according to claim 1, characterized in that: The two ends of the soft connection structure are fixed to the outlet end of the second blanking pipe and the inlet end of the first blanking pipe through throat hoops respectively.

5. The powder explosion-proof spraying device for lithium ion production according to claim 1, characterized in that: The drop pipe is arranged on the top surface of the metering tank, and the first drop pipe and the second drop pipe are arranged vertically.

6. The powder explosion-proof spraying device for lithium ion production according to claim 5, characterized in that: The valve on the second drop pipe is a butterfly valve.

7. The powder explosion-proof spraying device for lithium ion production according to claim 1, characterized in that: The top surface of the metering tank is also provided with a back-blowing filter, the back-blowing filter is provided with a back-blowing pipe, and the back-blowing pipe is provided with a back-blowing exhaust valve.

8. The powder explosion-proof spraying device for lithium ion production according to claim 7, characterized in that: The back-blowing pipe comprises a first back-blowing pipe connected to the back-blowing filter and a second back-blowing pipe provided with the back-blowing exhaust valve. The outlet end of the second back-blowing pipe and the inlet end of the first back-blowing pipe are spaced apart and flexibly connected by silica gel.

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