Defoaming and feeding system and lithium battery production line

Abstract

The invention relates to a defoaming and feeding system and a lithium battery production line. The defoaming and feeding system comprises a transfer tank, a storage trolley, a defoaming machine, a loading trolley, a first driving valve, a second driving valve, a third driving valve and a cooling unit, according to the defoaming and feeding system, automatic conveying of slurry can be achieved, the defoaming machine is arranged to conduct defoaming treatment on the slurry, bubbles are prevented from appearing on the surface of a lithium battery negative electrode roll, and the qualified rate of products is increased; and meanwhile, the cooling unit is arranged for controlling the temperature of the defoamed slurry, so that the flowing activity of the slurry can be always kept in a preset range, the width of the lithium battery negative electrode roll coating can reach the standard, the qualification rate of products is further improved, the productivity is further improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production equipment, and in particular to a defoaming feeding system and a lithium battery production line. Background Art

[0002] In the current lithium battery production process, after the workshop mixes the slurry, the pipeline equipment transports the slurry to the production line station. There is a transfer tank for temporarily storing the slurry at the production line station. When the slurry is needed, the screw pump extracts the slurry from the transfer tank to the feeding trolley, and then the feeding trolley transports it to the coating die head.

[0003] In the above production process, affected by the storage duration, bubbles will be generated in the slurry, and the slurry with bubbles will cause bubbles on the surface of the negative electrode roll of the lithium battery, resulting in unqualified acceptance. Moreover, during the transportation of the slurry, the temperature of the slurry is likely to rise, making its fluidity become active, which will also cause the coating width of the negative electrode roll of the lithium battery to not meet the standard. This not only wastes manpower and material resources, affects production capacity, but also increases production costs. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art that during the production process of lithium batteries, bubbles will be generated in the slurry, and the slurry with bubbles will cause bubbles on the surface of the negative electrode roll of the lithium battery, resulting in unqualified acceptance. Moreover, during the transportation of the slurry, the temperature of the slurry is likely to rise, making its fluidity become active, which will also cause the coating width of the negative electrode roll of the lithium battery to not meet the standard. This not only wastes manpower and material resources, affects production capacity, but also increases production costs.

[0005] To solve the above technical problems, the present invention provides a defoaming feeding system for feeding a coating head, including, A transfer tank; A storage trolley, which includes a storage tank, and the input end of the storage tank is connected to the output end of the transfer tank through a first pipeline; A defoamer, whose input end is connected to the output end of the storage tank through a second pipeline; A feeding trolley, which includes a feeding tank; A first driving valve, whose input port is connected to the output end of the defoamer through a third pipeline. One output port of the first driving valve is connected to the input end of the feeding tank through a fourth pipeline, and the other output port of the first driving valve is connected to the input end of the storage tank through a fifth pipeline; A second driving valve, whose input port is connected to the output end of the feeding tank through a sixth pipeline. One output port of the second driving valve is connected to the input end of the coating head through a feeding pipe, and the other output port of the second driving valve is connected to the input end of the storage tank through a circulation pipe. And the reflux end of the coating head is communicated with the circulation pipe through a reflux pipe; Cooling unit, the cooling unit includes a cooling pipe and a chiller, the cooling pipe is wound around the outside of the third pipeline, and both ends of the cooling pipe are respectively connected to the water outlet end and the water return end of the chiller.

[0006] In an embodiment of the present invention, a proportional ball valve is provided on the cooling pipe.

[0007] In an embodiment of the present invention, a temperature sensor is provided at one end of the third pipeline close to the first drive valve.

[0008] In an embodiment of the present invention, a third drive valve is provided on the first pipeline.

[0009] In an embodiment of the present invention, a first liquid level gauge and a second liquid level gauge are respectively provided on the storage tank and the feeding tank.

[0010] In an embodiment of the present invention, both the first drive valve and the second drive valve are pneumatic three-way valves, and the third drive valve is a pneumatic two-way valve.

[0011] In an embodiment of the present invention, a screw pump is provided on the sixth pipeline.

[0012] In an embodiment of the present invention, the defoaming machine includes a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected to the cooling pipe through a water inlet pipe and a water outlet pipe.

[0013] In an embodiment of the present invention, stirring devices are provided on both the storage tank and the feeding tank.

[0014] A lithium battery production line includes a defoaming and feeding system as described in any one of the above.

[0015] The above technical solutions of the present invention have the following advantages compared with the prior art: A defoaming feeding system and a lithium battery production line according to the present invention include a transfer tank, a storage trolley, a defoaming machine, a loading trolley, a first driving valve, a second driving valve, and a cooling unit; the input end of the storage trolley is connected to the output end of the transfer tank; the input end of the defoaming machine is connected to the output end of the storage tank; the loading trolley includes a loading tank; the input port of the first driving valve is connected to the output end of the defoaming machine through a third pipeline, one output port of the first driving valve is connected to the input end of the loading tank through a fourth pipeline, and the other output port is connected to the input end of the storage tank through a fifth pipeline; the input port of the second driving valve is connected to the output end of the loading tank through a sixth pipeline, one output port of the second driving valve is connected to the input end of the coating head through a feeding pipe, and the other output port is connected to the input end of the storage tank through a circulation pipe, and the reflux end of the coating head communicates with the circulation pipe through a reflux pipe; the cooling unit includes a cooling pipe and a chiller, the cooling pipe is wound outside the fourth pipeline, and the two ends of the cooling pipe are respectively connected to the water outlet end and the water return end of the chiller. The defoaming feeding system of the present invention can realize the automatic transportation of the slurry, and is provided with a defoaming machine to defoam the slurry, avoiding the appearance of bubbles on the surface of the negative electrode roll of the lithium battery and improving the qualified rate of the product; at the same time, a cooling unit is provided to control the temperature of the defoamed slurry, so that the fluidity activity of the slurry can always be maintained within a predetermined range, ensuring that the width of the coating of the negative electrode roll of the lithium battery can reach the standard, further improving the qualified rate of the product, thereby improving the production capacity and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention easier to be clearly understood, the following further describes the present invention in detail according to the specific embodiments of the present invention and in conjunction with the drawings, wherein Figure 1 is a schematic diagram of the overall structure of the defoaming feeding system of the preferred embodiment of the present invention; Figure 2 is a schematic diagram of the structure of the storage trolley of the defoaming feeding system of the preferred embodiment of the present invention; Figure 3 is a schematic diagram of the structure of the loading trolley of the defoaming feeding system of the preferred embodiment of the present invention; Figure 4 is a schematic diagram of the structure of the defoaming machine of the defoaming feeding system of the preferred embodiment of the present invention; Figure 5 is a schematic diagram of the second structural form of the cooling pipe of the defoaming feeding system of Embodiment 2.

[0017] Description of the reference numerals in the drawings: 1, transfer tank; 2, storage trolley; 21, storage tank; 22, first pipeline; 23, first liquid level gauge; 3, defoamer; 31, second pipeline; 32, water inlet pipe; 33, water outlet pipe; 4, feeding trolley; 41, feeding tank; 42, second liquid level gauge; 5, first driving valve; 51, third pipeline; 52, fourth pipeline; 53, fifth pipeline; 54, temperature sensor; 6, second driving valve; 61, sixth pipeline; 62, feeding pipe; 63, circulation pipe; 64, return pipe; 7, cooling unit; 71, cooling pipe; 72, chiller; 73, proportional ball valve; 8, third driving valve; 9, screw pump; A, coating head. Detailed implementation manners

[0018] The present invention will be further described below with reference to the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments given are not intended to limit the present invention.

[0019] Example 1. Refer to Figures 1 - 4 As shown, a defoaming and feeding system of the present invention is used to feed a coating head, and includes Transfer tank 1; Storage trolley 2, which includes a storage tank 21, and the input end of the storage tank 21 is connected to the output end of the transfer tank 1 through a first pipeline 22; Defoamer 3, whose input end is connected to the output end of the storage tank 21 through a second pipeline 31; Feeding trolley 4, which includes a feeding tank 41; First driving valve 5, whose input port is connected to the output end of the defoamer 3 through a third pipeline 51, one output port of the first driving valve 5 is connected to the input end of the feeding tank 41 through a fourth pipeline 52, and the other output port of the first driving valve 5 is connected to the input end of the storage tank 21 through a fifth pipeline 53; Second driving valve 6, whose input port is connected to the output end of the feeding tank 41 through a sixth pipeline 61, one output port of the second driving valve 6 is connected to the input end of the coating head A through a feeding pipe 62, the other output port of the second driving valve 6 is connected to the input end of the storage tank 21 through a circulation pipe 63, and the return end of the coating head is communicated with the circulation pipe 63 through a return pipe 64; Cooling unit 7, the cooling unit 7 includes a cooling pipe 71 and a chiller 72, the cooling pipe 71 is wound around the outside of the third pipeline 51, and the two ends of the cooling pipe 71 are respectively connected to the water outlet end and the water return end of the chiller 72.

[0020] Specifically, the output end of the transfer tank 1 is connected to the input end of the storage tank 21 through the first pipeline 22. A third driving valve 8 is arranged on the first pipeline 22. The output end of the storage tank 21 is connected to the input end of the defoaming machine 3 through the second pipeline 31. The output end of the defoaming machine 3 is connected to the input port of the first driving valve 5 (three-way valve) through the third pipeline 51. One output port of the first driving valve 5 is connected to the output end of the feeding tank 41 through the fourth pipeline 52. The other output port of the first driving valve 5 is connected to the input end of the storage tank 21 through the fifth pipeline 53. The output end of the feeding tank 41 is connected to the input port of the second driving valve 6 (three-way valve) through the sixth pipeline 61. One output port of the second driving valve 6 is connected to the input end of the coating head through the feeding pipe 62. The other output port of the second driving valve 6 is connected to the input end of the storage tank 21 through the circulation pipe 63. And the reflux end of the coating head is communicated with the circulation pipe 63 through the reflux pipe 64.

[0021] During the production process of the lithium battery, the slurry in the transfer tank 1 is first input into the storage tank 21 of the storage trolley 2 through the first pipeline 22. The input amount is controlled by the first liquid level gauge 23, the third driving valve 8 and the controller arranged on the storage tank 21 to ensure that the slurry in the storage tank 21 is always within a predetermined liquid level range. Then, the defoaming machine 3 extracts the slurry in the storage tank 21 through the second pipeline 31 for defoaming. After defoaming, the slurry is successively input into the feeding tank 41 through the third pipeline 51, the first driving valve 5 and the fourth pipeline 52. And in this process, the amount of the defoamed slurry input into the feeding tank 41 is controlled by the first driving valve 5 and the second liquid level gauge 42 arranged on the feeding tank 41 to ensure that the slurry in the feeding tank 41 is within a predetermined liquid level range. Then, the slurry in the feeding tank 41 is driven by the screw pump 9 arranged on the sixth pipeline 61 and is input into the coating head through the sixth pipeline 61, the second driving valve 6 and the feeding pipe 62 and finally sprayed on the negative electrode film. Part of the surplus material flows out from the reflux end of the coating head and is recycled to the storage tank 21 through the reflux pipe 64 and the circulation pipe 63 in sequence for recycling.

[0022] During the process of the above-mentioned slurry moving along the pipeline, when the slurry passes through the third pipeline 51, the cold water circulating in the cooling pipe 71 wound outside the third pipeline 51 can take away part of the heat of the slurry, ensuring that the temperature of the slurry remains stable during transportation, so that the flow activity of the slurry is maintained within a predetermined range, ensuring that the width of the lithium battery negative electrode roll coating can reach the standard and improving the qualification rate.

[0023] Specifically, in the early stage of the startup and operation of this defoaming feeding system, the output port where the first driving valve 5 is connected to the fourth pipeline 52 is in a closed state. During the operation, the slurry is input from the intermediate tank 1 into the storage tank 21. The storage tank 21 outputs the slurry to the defoaming machine 3. After the slurry is defoamed by the defoaming machine 3, it flows back to the storage tank 21 through the third pipeline 51, the first driving valve 5, and the fifth pipeline 53. It is not until the defoaming machine 3 operates stably that the output port where the first driving valve 5 is connected to the fourth pipeline 52 is opened. This can avoid the occurrence of incomplete defoaming problems caused by unstable operation in the early stage of the defoaming machine 3 startup.

[0024] Specifically, when the coating head is in a non-working state, due to the nature of the slurry, the output port where the second driving valve 6 is connected to the feeding pipe 62 is in a closed state. The slurry in the feeding tank 41 flows back to the storage tank 21 through the sixth pipeline 61, the second driving valve 6, and the circulation pipe 63 in sequence to form a circulating flow of the slurry. By this means, the slurry in the whole machine pipeline keeps flowing, preventing the slurry from settling and stratifying and maintaining the stable rheological properties of the slurry, which is beneficial to ensuring the coating quality.

[0025] A defoaming feeding system of the present invention can realize the automatic transportation of the slurry, and is provided with a defoaming machine to defoam the slurry, avoiding the appearance of bubbles on the surface of the negative electrode roll of the lithium battery and improving the qualified rate of the product; at the same time, a cooling unit is provided to control the temperature of the defoamed slurry, so that the flow activity of the slurry can always be maintained within a predetermined range, ensuring that the width of the coating of the negative electrode roll of the lithium battery can reach the standard, further improving the qualified rate of the product, thereby increasing the production capacity and reducing the production cost.

[0026] Further, a proportional ball valve 73 is provided on the cooling pipe 71.

[0027] Further, a temperature sensor 54 is provided at one end of the third pipeline 51 close to the first driving valve 5. Specifically, the temperature of the slurry can be monitored in real time through the temperature sensor 54. The controller adjusts the opening degree of the proportional ball valve 73 according to the detected temperature value of the slurry, adjusts the flow rate of the cooling water in the cooling pipe 71, so as to control the temperature of the slurry and keep it within a predetermined temperature range. The temperature sensor 54 can adopt a platinum thermal resistance.

[0028] Further, a third driving valve 8 is provided on the first pipeline 22.

[0029] Further, a first liquid level gauge 23 and a second liquid level gauge 42 are respectively provided on the storage tank 21 and the feeding tank 41.

[0030] Further, both the first driving valve 5 and the second driving valve 6 are pneumatic three-way valves, and the third driving valve 8 is a pneumatic two-way valve.

[0031] Further, a screw pump 9 is provided on the sixth pipeline 61.

[0032] Further, it includes a controller which is respectively connected to the first driving valve 5, the second driving valve 6, the third driving valve 8, the defoamer 3, the chiller 72, the screw pump 9, the first liquid level gauge 23 and the second liquid level gauge 42. The automatic control of each component and the whole system is realized through the controller.

[0033] Further, the defoamer 3 includes a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected to the cooling pipe 71 through the water inlet pipe 32 and the water outlet pipe 33.

[0034] Further, stirring devices are provided on both the storage tank 21 and the feeding tank 41. Specifically, both the storage tank 21 and the feeding tank 41 include a tank body. An input end (stop valves can be provided at both the input end and the output end) is provided on the side of the tank body, an output end is provided at the bottom of the tank body, a driving source is vertically provided at the top of the tank body, the output end of the driving source is coaxially connected to a stirring shaft extending into the tank body, and stirring blades are provided on the stirring shaft. Specifically, both the storage material trolley 2 and the feeding trolley 4 include a trolley, and the storage tank 21 and the feeding tank 41 are respectively connected to a trolley.

[0035] Embodiment 2, referring to Figure 5 As shown, on the basis of Embodiment 1, the present invention provides another structural form of the cooling pipe 71. The cooling pipe 71 is a multi-segment circular pipe sleeved on the third pipeline 51. Chambers are provided inside the circular pipes, and water inlets and water outlets communicating with the chambers are respectively provided at both ends of the circular pipes, and the water inlets and water outlets are respectively connected to the water outlet end and the water return end of the chiller 72.

[0036] Embodiment 3, the present invention also discloses a lithium battery production line, including the defoaming and feeding system as in Embodiment 1.

[0037] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A defoaming feeding system for feeding a coating head, characterized in that: including, transfer tank; material storage trolley, which includes a material storage tank, and the input end of the material storage tank is connected to the output end of the transfer tank through a first pipeline; degassing machine, whose input end is connected to the output end of the material storage tank through a second pipeline; loading trolley, which includes a loading tank; first drive valve, whose input port is connected to the output end of the degassing machine through a third pipeline, one output port of the first drive valve is connected to the input end of the loading tank through a fourth pipeline, and the other output port of the first drive valve is connected to the input end of the material storage tank through a fifth pipeline; second drive valve, whose input port is connected to the output end of the loading tank through a sixth pipeline, one output port of the second drive valve is connected to the input end of the coating head through a feed pipe, and the other output port of the second drive valve is connected to the input end of the material storage tank through a circulation pipe, and the reflux end of the coating head communicates with the circulation pipe through a reflux pipe; cooling unit, the cooling unit includes a cooling pipe and a chiller, the cooling pipe is wound outside the third pipeline, and the two ends of the cooling pipe are respectively connected to the water outlet end and the water return end of the chiller.

2. The defoaming feeding system according to claim 1, wherein: A proportional ball valve is arranged on the cooling pipe.

3. The defoaming feeding system according to claim 2, characterized in that: A temperature sensor is arranged at one end of the third pipeline close to the first drive valve.

4. The defoaming feeding system according to claim 1, wherein: A third drive valve is arranged on the first pipeline.

5. The defoaming feeding system according to claim 4, wherein: A first liquid level gauge and a second liquid level gauge are respectively arranged on the material storage tank and the loading tank.

6. The defoaming feeding system according to claim 4, characterized in that: The first drive valve and the second drive valve are both pneumatic three-way valves, and the third drive valve is a pneumatic two-way valve.

7. The defoaming feeding system according to claim 1, wherein: A screw pump is arranged on the sixth pipeline.

8. The defoaming feeding system according to claim 1, wherein: The degassing machine includes a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected to the cooling pipe through a water inlet pipe and a water outlet pipe.

9. The defoaming feeding system according to claim 1, wherein: Stirring devices are arranged on both the material storage tank and the loading tank.

10. A lithium battery production line, characterized in that: including the degassing and feeding system according to any one of claims 1-9.

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