Lithium battery aluminum foil carbon coating trough

Abstract

The utility model relates to a lithium battery aluminum foil carbon coating trough which comprises an inner trough body and an outer trough body, a fillet is arranged at the included angle of an inner cavity of the inner trough body, ultrasonic generators are installed on the two sides of the inner trough body respectively, the inner trough body is fixedly connected with the outer trough body, liquid in the inner trough body is communicated with liquid in the outer trough body, and a feeding pipe is installed on the inner trough body. A discharging pipe is installed on the outer groove, and flow control devices are arranged on the feeding pipe and the discharging pipe respectively. Compared with the prior art, the carbon coating trough for the aluminum foil of the lithium battery has the advantages that no stirring dead angle exists, the liquid level is balanced and stable, ultrasonic defoaming is realized, and the carbon coating trough is easy to clean after carbon coating is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a lithium battery aluminum foil carbon coating trough. Background Art

[0002] With the development of science and technology, lithium batteries are increasingly integrated into today's social life, and people's demand for lithium batteries is also gradually increasing. During the lithium battery manufacturing process, the contact and adhesion reliability between the main material and the current collector aluminum foil affects the battery's internal resistance and cycle life. To ensure low internal resistance and high cycle life of lithium batteries, carbon coating the aluminum foil is a common choice. Carbon coating of aluminum foil involves mixing and dispersing a carbon-containing conductive material with a binder, then evenly applying it to the surface of the aluminum foil. This forms a coating that collects the active material's microcurrent and provides excellent static conductivity. This coating can significantly reduce the contact resistance between the main material and the aluminum foil and improve the adhesion between the two, thereby significantly improving the overall performance of the battery.

[0003] At present, the material tanks for carbon coating of aluminum foil for lithium batteries are mostly rectangular in shape, which has dead corners for stirring and cannot ensure the uniformity of the carbon-containing slurry. Secondly, during the process of carbon coating of aluminum foil, the liquid level in the material tank is very likely to fluctuate, resulting in inconsistent ink filling in the mesh holes of the carbon coating roller, which in turn causes coating omissions or uneven carbon coating. Furthermore, there are often some bubbles in the carbon-containing slurry during use, which form defects in the carbon coating of aluminum foil, affecting the efficiency of the current process and the yield of the finished carbon coating products of aluminum foil, posing a risk of scrapping the products of subsequent processes or the final finished batteries. Finally, after the carbon coating of aluminum foil is completed, the material tank also relies on manual cleaning, which is difficult to clean, has poor cleaning effect, and consumes a lot of cleaning solvent resources and time resources. Utility Model Content

[0004] The purpose of the utility model is to provide a lithium battery aluminum foil carbon coating trough to solve the problems encountered in the above background technology.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A lithium battery aluminum foil carbon coating trough includes an inner trough and an outer trough. The inner cavity of the inner trough is provided with a rounded corner. Ultrasonic generators are respectively installed on both sides of the inner trough. The inner trough is fixedly connected to the outer trough and the internal liquid is connected. A feed pipe is installed on the inner trough, and a discharge pipe is installed on the outer trough. Flow control devices are respectively provided on the feed pipe and the discharge pipe.

[0007] The inner trough is a rounded rectangular structure or a waist-shaped structure, the outer trough is a semi-conical or semi-funnel structure, and a liquid level sensor is installed inside the outer trough near the upper notch.

[0008] In the above solution, the feed pipe is installed in the upper middle portion of one long side of the inner trough, and the discharge pipe is installed at the bottom opening of the outer trough. A liquid level balancing port is provided in the middle of the other long side of the inner trough, and the port is a rectangular opening. The ultrasonic generators are installed symmetrically on the left and right short sides of the inner trough.

[0009] A lithium battery aluminum foil carbon coating tank comprises an inner tank and an outer tank, and also includes a system, wherein the system is respectively connected to an ultrasonic generator and a flow control device. Specifically, the flow control device includes a first flow control valve and a second flow control valve, wherein the first flow control valve is mounted on the feed pipe and the second flow control valve is mounted on the discharge pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. By setting the inner trough with rounded corners, the problem of carbonaceous slurry accumulating and agglomerating in the four corners of the conventional rectangular trough is avoided. For further improvement, the bottom can also be rounded to facilitate later cleaning and avoid cleaning dead corners or material agglomeration.

[0012] 2. By installing ultrasonic generators on the left and right short sides of the inner trough, the characteristics of ultrasound are utilized to more fully stir the carbon-containing slurry, improve the uniformity of the carbon-containing slurry, ensure the stability of the aluminum foil carbon coating, and also avoid the accumulation and agglomeration of the carbon-containing slurry. In addition, the cavitation effect of ultrasound can generate impact force, which accelerates the movement of tiny bubbles dissolved in the liquid and causes them to float to the surface of the liquid, thereby eliminating bubbles in the carbon-containing slurry and avoiding carbon coating defects caused by bubbles in the carbon-containing slurry.

[0013] 3. By providing a liquid level balance port on the inner material tank, the carbon-containing slurry is allowed to overflow according to the specified liquid level balance port. On the one hand, the liquid level of the carbon-containing slurry in the inner material tank can be maintained at a relatively stable level, ensuring the fluidity of the carbon-containing slurry in the inner material tank and avoiding the problem of accumulation and agglomeration of the carbon-containing slurry. On the other hand, it can also avoid the potential overflow and pollution hazards of the carbon-containing slurry in the absence of a liquid level balance port.

[0014] 4. By installing an extra-liquid sensor in the outer tank, the liquid level of the carbon-containing slurry overflowing from the liquid level balance port into the outer tank is monitored in real time. The flow control devices on the feed pipe and the discharge pipe are linked by the system to control the feed and discharge amounts of the carbon-containing slurry. The liquid level balance port is used to maintain the liquid level of the carbon-containing slurry in the inner tank at a relatively stable level, so that the ink filling amount in the mesh of the aluminum foil carbon coating roller is kept at the same point, thereby improving the utilization rate of the carbon-containing slurry and the carbon coating efficiency, and ensuring the consistency of the finished aluminum foil carbon coating product.

[0015] 5. After the aluminum foil carbon coating operation is completed, the feed pipe and the discharge pipe can be closed through the flow control device, and the cleaning liquid can be injected into the inner and outer troughs. The ultrasonic characteristics of the ultrasonic generator are used for cleaning, which can save cleaning solvent resources, reduce the difficulty of cleaning, shorten the cleaning time, and reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Numbers in the figure: 1-inner material trough; 11-rounded corner; 12-liquid level balance port; 2-outer trough; 3-feed pipe; 31-first flow control valve; 4-ultrasonic generator; 5-discharge pipe; 51-second flow control valve; 6-liquid level sensor. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention will now be further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the relevant components of the present invention.

[0020] According to the technical solution of the present invention, without changing the essential spirit of the present invention, those skilled in the art may propose a variety of interchangeable structural methods and implementation methods. Therefore, the following specific embodiments and drawings are merely illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the present invention.

[0021] The technical solution of the present utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Example 1, as Figure 1 As shown, a lithium battery aluminum foil carbon coating tank includes an inner tank 1 and an outer tank 2. The inner cavity corners of the inner tank 1 are provided with rounded corners, wherein the inner tank 1 is a rounded rectangular structure or a waist-shaped structure, both of which can avoid the existence of cleaning dead corners. The inner tank 1 adopts a rounded rectangular body design, and the inner tank 1 is rounded on all sides, avoiding the problem that the four corners of the conventional rectangular tank cannot be stirred, and there are dead corners causing the carbon-containing slurry to accumulate and agglomerate. For further improvement, the bottom can also be provided with rounded corners to facilitate later cleaning and avoid cleaning dead corners or material agglomeration.

[0023] Ultrasonic wave generators 4 are mounted on either side of the inner trough 1. These are sound wave converters that convert electrical energy or other energy into ultrasonic waves. These ultrasonic wave generators 4 are mounted symmetrically on the left and right short sides of the inner trough 1, simultaneously emitting ultrasonic waves to the slurry on both sides of the trough.

[0024] By installing ultrasonic generators 4 on the left and right short sides of the inner trough 1, the characteristics of ultrasound are utilized to more thoroughly stir the carbon-containing slurry, improving its uniformity and ensuring the stability of the carbon coating on the aluminum foil. This also prevents the accumulation and agglomeration of the carbon-containing slurry. Furthermore, the cavitation effect of ultrasound can generate impact force, which accelerates the movement of tiny bubbles dissolved in the liquid and causes them to float to the surface, thereby eliminating bubbles in the carbon-containing slurry and avoiding carbon coating defects caused by bubbles in the carbon-containing slurry.

[0025] The inner material trough 1 is fixedly connected to the outer trough 2 by welding and the internal liquid is connected. A feed pipe 3 is installed on the inner material trough 1, and a discharge pipe 5 is installed on the outer trough 2. Flow control devices are respectively provided on the feed pipe 3 and the discharge pipe 5 to control the transportation of the slurry to make it more stable and uniform.

[0026] Among them, the outer tank 2 is a semi-conical or semi-funnel-shaped structure, and a liquid level sensor 6 is installed inside the outer tank 2 near the upper slot. The liquid level sensor 6 is a liquid position sensing element, which is connected to the external system and can monitor the carbon slurry level in the outer tank 2 in real time.

[0027] Specifically, the feed pipe 3 is installed in the middle upper part of the long side of the inner tank 1, and the discharge pipe 5 is installed at the bottom opening of the outer tank 2. A liquid level balance port 12 is provided in the middle of the long side of the inner tank 1. The liquid level balance port 12 is a rectangular opening structure, and the slurry in the inner tank 1 can overflow from the liquid level balance port 12 into the outer tank 2. By providing the liquid level balance port 12 on the inner tank 1, the carbon-containing slurry is allowed to overflow according to the specified liquid level balance port 12. On the one hand, the liquid level of the carbon-containing slurry in the inner tank 1 can be maintained at a relatively stable level, ensuring the fluidity of the carbon-containing slurry in the inner tank 1 and avoiding the problem of accumulation and agglomeration of the carbon-containing slurry without flowing. On the other hand, it can also avoid the potential risk of overflow and pollution caused by the carbon-containing slurry in the absence of the liquid level balance port 12.

[0028] By installing an extra-liquid sensor 6 in the outer tank 2, the liquid level of the carbon-containing slurry overflowing from the liquid level balance port 12 into the outer tank is monitored in real time. The flow control device on the feed pipe 3 and the discharge pipe 6 is linked by the system to control the feed amount and discharge amount of the carbon-containing slurry. The liquid level balance port 12 is used to maintain the liquid level of the carbon-containing slurry in the inner tank 1 at a relatively stable level, so that the ink filling amount of the mesh in the aluminum foil carbon coating roller is kept at the same point, thereby improving the utilization rate of the carbon-containing slurry and the carbon coating efficiency, and ensuring the consistency of the aluminum foil carbon coating product.

[0029] Example 2, based on Example 1, a lithium battery aluminum foil carbon coating material tank includes an inner material tank 1 and an outer tank 2, and also includes a system, which is a PLC system, and the system is respectively connected to the ultrasonic generator 4 and the flow control device.

[0030] In a specific implementation, the flow control device includes a first flow control valve 31 and a second flow control valve 51. The first flow control valve 31 is installed on the feed pipe 3, and the second flow control valve 51 is installed on the discharge pipe 5. The first flow control valve 31 is installed on the feed pipe 3 of the inner tank 1, which can be linked with the system to control the feed flow rate to ensure a stable supply of carbon-containing slurry during the carbon coating process. The second flow control valve 51 is installed on the discharge pipe 5 of the outer tank 2, which can be linked with the system to control the discharge flow rate to ensure a stable liquid level of the carbon-containing slurry during the carbon coating process.

[0031] After the aluminum foil carbon coating operation is completed, the feed pipe 3 and the discharge pipe 5 can be closed through the flow control device, and the cleaning liquid can be injected into the inner trough 1 and the outer trough 2. The ultrasonic characteristics of the ultrasonic generator 4 are used for cleaning, which can save cleaning solvent resources, reduce the difficulty of cleaning, shorten the cleaning time, and reduce labor costs.

[0032] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A lithium battery aluminum foil carbon coating tank, characterized by: The invention comprises an inner trough (1) and an outer trough (2), wherein the inner cavity angle of the inner trough (1) is provided with a rounded corner, ultrasonic generators (4) are respectively installed on both sides of the inner trough (1), the inner trough (1) is fixedly connected to the outer trough (2) and the internal liquid is communicated, a feed pipe (3) is installed on the inner trough (1), a discharge pipe (5) is installed on the outer trough (2), and flow control devices are respectively provided on the feed pipe (3) and the discharge pipe (5).

2. A lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: The inner material trough (1) is a rounded rectangular structure.

3. The lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: The inner material trough (1) is a waist-shaped structure.

4. The lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: The outer groove (2) is a semi-conical or semi-funnel-shaped structure.

5. A lithium battery aluminum foil carbon coating tank according to claim 4, characterized in that: A liquid level sensor (6) is installed inside the outer tank (2) near the upper notch.

6. The lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: The feed pipe (3) is installed at the upper middle portion of the long side of the inner trough (1), and the discharge pipe (5) is installed at the bottom opening of the outer trough (2).

7. A lithium battery aluminum foil carbon coating tank according to claim 6, characterized in that: A liquid level balancing port (12) is provided in the middle of the other long side of the inner material tank (1), and the liquid level balancing port (12) is a rectangular opening structure.

8. The lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: It also includes a system, which is connected to the ultrasonic generator (4) and the flow control device respectively.

9. A lithium battery aluminum foil carbon coating tank according to claim 8, characterized in that: The flow control device comprises a first flow control valve (31) and a second flow control valve (51), wherein the first flow control valve (31) is installed on the feed pipe (3) and the second flow control valve (51) is installed on the discharge pipe (5).

10. The lithium battery aluminum foil carbon coating tank according to claim 1, characterized in that: The ultrasonic generators (4) are installed on the left and right short sides of the inner trough (1) and are symmetrically arranged.

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