Circulating defoaming structure for lithium ion battery slurry

Abstract

The utility model discloses a lithium ion battery slurry circulating defoaming structure which comprises two slurry storage tanks, a first conveying pipeline and a second conveying pipeline, the first conveying pipeline and the second conveying pipeline are arranged between the two slurry storage tanks, and the two slurry storage tanks are the first slurry storage tank and the second slurry storage tank respectively. The conveying direction of the first conveying pipeline is from the first slurry storage tank to the second slurry storage tank, and the conveying direction of the second conveying pipeline is from the second slurry storage tank to the first slurry storage tank; the first conveying pipeline and the second conveying pipeline are each provided with a filter used for filtering slurry to remove bubbles. The two slurry storage tanks for slurry circulation are arranged, and the filter boxes for filtering bubbles are arranged on the first conveying pipelines and the second conveying pipelines of the two slurry storage tanks, so that the bubbles in the slurry can be continuously crushed by the filter screens in the filter boxes, the repeated reciprocation of slurry defoaming is realized, and the defoaming is more thorough.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery production technology, and in particular to a lithium-ion battery slurry circulation defoaming structure. Background Technology

[0002] Lithium-ion battery slurry is prone to air bubbles during mixing, stirring, and conveying. These air bubbles can cause pinholes during coating, leading to insufficient negative electrode material. After the battery cell is manufactured, lithium plating may occur at the corresponding locations, posing a serious quality and safety hazard.

[0003] In the lithium battery production process, conventional defoaming methods are achieved by standardizing pipe diameter, vacuuming, and changing bent pipes to straight pipes. These methods are only one-time defoaming measures and cannot continuously eliminate air bubbles in the slurry, resulting in incomplete defoaming. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a lithium-ion battery slurry circulation defoaming structure.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A lithium-ion battery slurry circulation defoaming structure includes: two slurry storage tanks and a first conveying pipe and a second conveying pipe disposed between the two slurry storage tanks, the two slurry storage tanks being a first slurry storage tank and a second slurry storage tank, the conveying direction of the first conveying pipe being from the first slurry storage tank to the second slurry storage tank, the conveying direction of the second conveying pipe being from the second slurry storage tank to the first slurry storage tank, and both the first conveying pipe and the second conveying pipe being provided with filter elements for filtering the slurry to remove air bubbles.

[0007] In one embodiment, the two ends of the first conveying pipe are a first inlet and a first outlet, respectively. The first inlet is connected to the first slurry storage tank, and the first outlet is connected to the second slurry storage tank. The two ends of the second conveying pipe are a second inlet and a second outlet, respectively. The second inlet is connected to the second slurry storage tank, and the second outlet is connected to the first slurry storage tank.

[0008] In one embodiment, a first screw pump and a second screw pump are respectively provided on the first conveying pipeline and the second conveying pipeline. The first screw pump is used to transport the slurry in the first slurry storage tank to the second slurry storage tank through the first conveying pipeline, and the second screw pump is used to transport the slurry in the second slurry storage tank to the first slurry storage tank through the second conveying pipeline.

[0009] In one embodiment, the filter element is a filter box, and the filter box is provided with a filter screen for separating air bubbles, the filter screen being located in the middle of the filter box.

[0010] In one embodiment, the filter box on the first conveying pipe is located near the first discharge port, and the filter box on the second conveying pipe is located near the second discharge port.

[0011] In one embodiment, both the first slurry storage tank and the second slurry storage tank are equipped with an upper level gauge and a lower level gauge. The upper level gauge is located at the upper part of the first slurry storage tank and the second slurry storage tank, and the lower level gauge is located at the lower part of the first slurry storage tank and the second slurry storage tank.

[0012] In one embodiment, a controller is provided between the two slurry storage tanks. The controller is electrically connected to the first screw pump and the second screw pump, and is also electrically connected to the upper and lower level gauges in the two slurry storage tanks.

[0013] In one embodiment, pressure gauges are provided on both the first and second conveying pipes.

[0014] In one embodiment, both the first conveying pipe and the second conveying pipe are provided with defoaming components for further removing air bubbles from the slurry. The defoaming component on the first conveying pipe is located near the first feed inlet, and the defoaming component on the second conveying pipe is located near the second feed inlet. The first conveying pipe and the second conveying pipe are respectively connected to the two defoaming components.

[0015] In one embodiment, the defoaming assembly includes a defoaming chamber, an ultrasonic generator located inside the defoaming chamber, and an exhaust port located on the defoaming chamber. The ultrasonic generator is used to separate bubbles from the slurry. The exhaust port is located at the upper part of the defoaming chamber. A vacuum pump is connected to one end of the exhaust port away from the defoaming chamber. The vacuum pump is used to discharge bubbles from the exhaust port to the outside of the defoaming chamber.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] This utility model discloses a lithium-ion battery slurry circulation defoaming structure. It employs two slurry storage tanks for circulation. When the slurry levels in the two tanks reach the upper and lower level gauges respectively, the controller activates the first and second screw pumps to transport the slurry from one tank to the other, thus creating a slurry circulation within the two tanks. During this circulation, air bubbles in the slurry are continuously broken by the filter screen in the filter box, achieving repeated defoaming and making the defoaming more thorough. This reduces the number of air bubbles in the slurry transported from the two storage tanks to the coating process. Furthermore, defoaming components are installed on the first and second conveying pipes to further eliminate air bubbles in the slurry. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 A schematic diagram of a lithium-ion battery slurry circulation defoaming structure provided by this utility model;

[0020] Figure 2 A schematic diagram of the filter box in a lithium-ion battery slurry circulation defoaming structure provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the defoaming component in a lithium-ion battery slurry circulation defoaming structure provided by this utility model.

[0022] Figure descriptions: 10. First conveying pipe; 11. First feed inlet; 12. First discharge outlet; 20. Second conveying pipe; 21. Second feed inlet; 22. Second discharge outlet; 30. First slurry storage tank; 40. Second slurry storage tank; 50. First screw pump; 60. Second screw pump; 70. Filter box; 71. Filter screen; 80. Upper level gauge; 90. Lower level gauge; 100. Controller; 110. Pressure gauge; 120. Defoaming assembly; 121. Defoaming chamber; 122. Ultrasonic generator; 123. Exhaust port; 124. Vacuum pump. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0024] A lithium-ion battery slurry circulation defoaming structure, with reference to Figure 1The system includes two slurry storage tanks and a first conveying pipe 10 and a second conveying pipe 20 located between the two slurry storage tanks. Both the first conveying pipe 10 and the second conveying pipe 20 are equipped with filter elements for filtering the slurry to remove air bubbles. The two slurry storage tanks are a first slurry storage tank 30 and a second slurry storage tank 40. The conveying direction of the first conveying pipe 10 is from the first slurry storage tank 30 to the second slurry storage tank 40, and the conveying direction of the second conveying pipe 20 is from the second slurry storage tank 40 to the first slurry storage tank 30. Specifically, the two ends of the first conveying pipe 10 are a first inlet 11 and a first outlet 12, respectively. The first inlet 11 is connected to the first slurry storage tank 30, and the first outlet 12 is connected to the second slurry storage tank 40. The two ends of the second conveying pipe 20 are a second inlet 21 and a second outlet 22, respectively. The second inlet 21 is connected to the second slurry storage tank 40, and the second outlet 22 is connected to the first slurry storage tank 30. The first conveying pipe 10 is used to transport the slurry in the first slurry storage tank 30 to the second slurry storage tank 40, and the second conveying pipe 20 is used to transport the slurry in the second slurry storage tank 40 to the first slurry storage tank 30, thus forming a slurry circulation between the two slurry storage tanks. It should be noted that valves for control are provided on the first inlet 11 and the first outlet 12 at both ends of the first conveying pipe 10, and on the second inlet 21 and the second outlet 22 at both ends of the second conveying pipe 20. Both slurry storage tanks are connected to inlet pipes to transport the slurry from the mixing process to the two slurry storage tanks. Both slurry storage tanks are also connected to outlet pipes to transport the slurry from the two slurry storage tanks to the coating process.

[0025] Furthermore, referring to Figure 1 A first screw pump 50 and a second screw pump 60 are respectively installed on the first conveying pipe 10 and the second conveying pipe 20. The first screw pump 50 is used to transport the slurry in the first slurry storage tank 30 to the second slurry storage tank 40 through the first conveying pipe 10, and the second screw pump 60 is used to transport the slurry in the second slurry storage tank 40 to the first slurry storage tank 30 through the second conveying pipe 20.

[0026] Reference Figure 1 and Figure 2 The filter element is a filter box 70, which contains a filter screen 71 for separating air bubbles. It should be noted that the filter screen 71 is located in the center of the filter box 70 to filter the slurry entering the filter box 70. In this embodiment, the filter screen 71 is an arc-shaped filter screen, and the material of the filter screen 71 can be stainless steel, nickel, carbon fiber, or high-strength plastic. The mesh size of the filter screen 71 is 80-120 mesh.

[0027] Reference Figure 1The filter box 70 on the first conveying pipe 10 is located near the first discharge port 12 to filter the slurry transported from the first slurry storage tank 30 to the second slurry storage tank 40. The filter box 70 on the second conveying pipe 20 is located near the second discharge port 22 to filter the slurry transported from the second slurry storage tank 40 to the first slurry storage tank 30.

[0028] Reference Figure 1 Both the first slurry storage tank 30 and the second slurry storage tank 40 are equipped with an upper level gauge 80 and a lower level gauge 90. The upper level gauge 80 is located at the upper part of the first slurry storage tank 30 and the second slurry storage tank 40, and the lower level gauge 90 is located at the lower part of the first slurry storage tank 30 and the second slurry storage tank 40. Both the upper level gauge 80 and the lower level gauge 90 are used to detect the slurry level in the two slurry storage tanks. When the slurry level in one slurry storage tank reaches the upper level gauge 80, the inlet of that slurry storage tank is closed so that the slurry in that slurry storage tank can be transported to the other slurry storage tank. When the slurry level in one slurry storage tank reaches the lower level gauge 90, the outlet of that slurry storage tank is closed so that the slurry in the other slurry storage tank can be transported to that slurry storage tank, thereby achieving slurry circulation between the two slurry storage tanks.

[0029] Furthermore, referring to Figure 1 A controller 100 is provided between the two slurry storage tanks. The controller 100 is electrically connected to the first screw pump 50 and the second screw pump 60, and is also electrically connected to the upper level gauge 80 and the lower level gauge 90 in the two slurry storage tanks to control the circulation and transportation of slurry in the two slurry storage tanks. It should be noted that the slurry required in the lithium-ion battery production process is first stored in two slurry storage tanks when it is transported to the coating process through the mixing process. When the slurry level in the two storage tanks reaches the upper level gauge 80 and the lower level gauge 90 respectively, the controller 100 will control the first screw pump 50 and the second screw pump 60 to operate, so that the slurry in one storage tank is transported to the other storage tank, thus forming a slurry circulation between the two storage tanks. During this circulation process, the air bubbles in the slurry will be continuously squeezed out by the filter screen 71 in the filter box 70, realizing the repeated defoaming of the slurry, making the defoaming more thorough, thereby reducing the number of air bubbles in the slurry transported to the coating process from the two storage tanks.

[0030] Furthermore, referring to Figure 1 Pressure gauges 110 are provided on both the first conveying pipe 10 and the second conveying pipe 20. The two pressure gauges 110 are used to detect the pipe pressure of the first conveying pipe 10 and the second conveying pipe 20, respectively.

[0031] Furthermore, referring to Figure 1 and Figure 3Both the first conveying pipe 10 and the second conveying pipe 20 are equipped with defoaming components 120 for further removing air bubbles from the slurry. The defoaming component 120 on the first conveying pipe 10 is located near the first inlet 11, and the defoaming component 120 on the second conveying pipe 20 is located near the second inlet 21. It should be noted that the first conveying pipe 10 and the second conveying pipe 20 are respectively connected to the two defoaming components 120. The slurry entering from the first inlet 11 on the first conveying pipe 10 continues to be transported after passing through the defoaming component 120, and the slurry entering from the second inlet 21 on the second conveying pipe 20 continues to be transported after passing through the defoaming component 120.

[0032] Reference Figure 3 The defoaming assembly 120 includes a defoaming chamber 121, an ultrasonic generator 122 located inside the defoaming chamber 121, and an exhaust port 123 located on the defoaming chamber 121. The defoaming chamber 121 is a sealed container. The ultrasonic generator 122 is used to separate bubbles from the slurry. When small bubbles are present in the slurry, the slurry will merge with the small bubbles and will not be easily separated. The ultrasonic generator 122 can use high-frequency acoustic vibration to separate the slurry from the bubbles. The bubbles will exist in the upper space of the defoaming chamber 121. The exhaust port 123 is located at the top of the defoaming chamber 121. A vacuum pump 124 is connected to the end of the exhaust port 123 furthest from the defoaming chamber 121. The vacuum pump 124 is used to expel air bubbles from the defoaming chamber 121 through the exhaust port 123 to the outside of the chamber. The vacuum negative pressure of the vacuum pump 124 allows air bubbles separated from the slurry to be expelled from the defoaming chamber 121, thereby eliminating air bubbles in the slurry. The defoamed slurry is then transported by a screw pump to a filter box 70 for further filtration before reaching another slurry storage tank. It should be noted that both the ultrasonic generator 122 and the vacuum pump 124 are electrically connected to the controller 100. When the first screw pump 50 and the second screw pump 60 are running, the defoaming assembly 120 connected to the first screw pump 50 and the second screw pump 60 operates synchronously.

[0033] Furthermore, the ultrasonic frequency of the ultrasonic generator 122 is 20±5KHZ, and the amplitude is 80μm-100μm.

[0034] This invention utilizes two slurry storage tanks for slurry circulation. When the slurry levels in the two tanks reach the positions of the upper level gauge 80 and the lower level gauge 90, respectively, the controller 100 activates the first screw pump 50 and the second screw pump 60 to transport the slurry from one tank to the other, thus creating a slurry circulation within the two tanks. During this circulation, air bubbles in the slurry are continuously broken by the filter screen 71 in the filter box 70, achieving repeated defoaming and making defoaming more thorough, thereby reducing the number of air bubbles in the slurry transported from the two tanks to the coating process. Furthermore, the first conveying pipe 10 and the second conveying pipe 20 are equipped with a defoaming assembly 120 to further eliminate air bubbles in the slurry.

[0035] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A lithium ion battery slurry circulation de-foaming structure, characterized in that, The application relates to a slurry conveying device. The device comprises two slurry storage tanks and a first conveying pipeline (10) and a second conveying pipeline (20) arranged between the two slurry storage tanks, wherein the two slurry storage tanks are respectively a first slurry storage tank (30) and a second slurry storage tank (40), the conveying direction of the first conveying pipeline (10) is from the first slurry storage tank (30) to the second slurry storage tank (40), the conveying direction of the second conveying pipeline (20) is from the second slurry storage tank (40) to the first slurry storage tank (30), and a filter element for filtering slurry to remove bubbles is arranged on the first conveying pipeline (10) and the second conveying pipeline (20).

2. The lithium ion battery slurry circulation defoaming structure according to claim 1, characterized in that, The two ends of the first conveying pipeline (10) are respectively a first feeding port (11) and a first discharging port (12), the first feeding port (11) is communicated with the first slurry storage tank (30), the first discharging port (12) is communicated with the second slurry storage tank (40), the two ends of the second conveying pipeline (20) are respectively a second feeding port (21) and a second discharging port (22), the second feeding port (21) is communicated with the second slurry storage tank (40), and the second discharging port (22) is communicated with the first slurry storage tank (30).

3. A lithium ion battery slurry circulation defoaming structure according to claim 2, characterized in that, A first screw pump (50) and a second screw pump (60) are respectively arranged on the first conveying pipeline (10) and the second conveying pipeline (20), the first screw pump (50) is used for conveying slurry in the first slurry storage tank (30) to the second slurry storage tank (40) through the first conveying pipeline (10), and the second screw pump (60) is used for conveying slurry in the second slurry storage tank (40) to the first slurry storage tank (30) through the second conveying pipeline (20).

4. The lithium ion battery slurry circulation defoaming structure according to claim 3, characterized in that, The filter element is a filter box (70), a filter screen (71) for separating bubbles is arranged in the filter box (70), and the filter screen (71) is located at a middle position of the filter box (70).

5. A lithium ion battery slurry circulation defoaming structure according to claim 4, characterized in that, The filter box (70) on the first conveying pipeline (10) is located close to the first discharging port (12), and the filter box (70) on the second conveying pipeline (20) is located close to the second discharging port (22).

6. A lithium-ion battery slurry circulation defoaming structure according to claim 5, characterized in that, An upper liquid level meter (80) and a lower liquid level meter (90) are arranged in the first slurry storage tank (30) and the second slurry storage tank (40), the upper liquid level meter (80) is located at an upper position of the first slurry storage tank (30) and the second slurry storage tank (40), and the lower liquid level meter (90) is located at a lower position of the first slurry storage tank (30) and the second slurry storage tank (40).

7. A lithium-ion battery slurry circulation defoaming structure according to claim 6, characterized in that, A controller (100) is arranged between the two slurry storage tanks, the controller (100) is electrically connected with the first screw pump (50) and the second screw pump (60), and the controller (100) is electrically connected with the upper liquid level meter (80) and the lower liquid level meter (90) in the two slurry storage tanks.

8. The lithium ion battery slurry circulation defoaming structure according to claim 1, characterized in that, Pressure gauges (110) are arranged on the first conveying pipe (10) and the second conveying pipe (20).

9. The lithium ion battery slurry circulation defoaming structure of claim 2, wherein, A bubble removing assembly (120) for further removing bubbles in the slurry is arranged on the first conveying pipe (10) and the second conveying pipe (20), the bubble removing assembly (120) on the first conveying pipe (10) is arranged close to the first feeding port (11), the bubble removing assembly (120) on the second conveying pipe (20) is arranged close to the second feeding port (21), and the first conveying pipe (10) and the second conveying pipe (20) are respectively communicated with the two bubble removing assemblies (120).

10. The lithium ion battery slurry circulation deaeration structure of claim 9, wherein, The bubble removing assembly (120) comprises a bubble removing tank (121), an ultrasonic generator (122) arranged in the bubble removing tank (121) and an exhaust port (123) arranged on the bubble removing tank (121), the ultrasonic generator (122) is used for separating bubbles from the slurry, the exhaust port (123) is arranged at an upper position of the bubble removing tank (121), a vacuum pump (124) is connected to one end of the exhaust port (123) away from the bubble removing tank (121), and the vacuum pump (124) is used for discharging bubbles from the exhaust port (123) to outside of the bubble removing tank (121).

Images