Preparation device for strengthening binding power of negative pole piece

Abstract

The utility model relates to a preparation device for strengthening binding power of a negative pole piece, and relates to the technical field of lithium ion batteries, in order to solve the problem of low binding strength of the negative pole piece, the preparation device comprises a fixed seat arranged at an inlet of a coating oven, a transmission mechanism and a spraying mechanism are arranged on the fixed seat, the spraying mechanism is arranged below the transmission mechanism, and the transmission mechanism is arranged below the spraying mechanism. The spraying mechanism comprises a solution storage box, a solution conveying pump and a spraying rod, the solution storage box is arranged on the ground, the inlet end of the solution conveying pump communicates with the interior of the solution storage box, the outlet end of the solution conveying pump communicates with the interior of the spraying rod, the spraying rod is connected to the fixing base, a plurality of spraying openings are formed in the spraying rod, and the spraying openings are communicated with the interior of the spraying rod. And the plurality of spraying openings are arranged towards the direction of the transmission mechanism. The adhesive has the effect of improving the adhesive force.

Description

Technical Field

[0001] This application relates to the technical field of lithium-ion batteries, and particularly to a device for enhancing the bonding force of a negative electrode sheet. Background Art

[0002] With the popularization of electronic products such as electric vehicles and smart phones, as the core power source of these products, the stability and safety of the performance of lithium-ion batteries are particularly important. In the manufacturing process of lithium-ion batteries, the production of the negative electrode sheet is a crucial link, and its performance directly affects the capacity, cycle life and safety performance of the battery.

[0003] However, in the process of preparing the negative electrode sheet, as the sheet gradually dries in the coating oven, the binder in the slurry will float due to the volatilization of the solvent. This phenomenon poses a technical challenge to the preparation of the negative electrode sheet. The floating of the binder will reduce the bonding strength between the active material and the current collector, thereby affecting the overall performance of the battery, so it needs to be improved. Summary of the Utility Model

[0004] In order to solve the problem of low bonding strength of the negative electrode sheet, this application provides a device for enhancing the bonding force of the negative electrode sheet.

[0005] The device for enhancing the bonding force of the negative electrode sheet provided by this application adopts the following technical solutions:

[0006] A device for enhancing the bonding force of a negative electrode sheet includes a fixed seat arranged at the entrance of a coating oven. A transmission mechanism and a spraying mechanism are provided on the fixed seat. The spraying mechanism is arranged below the transmission mechanism. The spraying mechanism includes a solution storage tank, a solution delivery pump and a spray bar. The solution storage tank is arranged on the ground. The inlet end of the solution delivery pump is connected to the inside of the solution storage tank, and the outlet end of the solution delivery pump is connected to the inside of the spray bar. The spray bar is connected to the fixed seat. A plurality of spray openings are formed in the spray bar, and all the plurality of spray openings are arranged in the direction of the transmission mechanism.

[0007] As the electrode sheet gradually dries in the coating oven, the binder in the slurry will float up due to the volatilization of the solvent. This phenomenon poses a technical challenge to the preparation of the negative electrode sheet. The floating of the binder will reduce the bonding strength between the active material and the current collector, thereby affecting the overall performance of the battery. By adopting the above technical solution, including a fixed seat, a transmission mechanism and a spraying mechanism are installed on the fixed seat. The spraying mechanism includes a solution storage tank, a solution delivery pump and a spray bar. When preparing the negative electrode sheet, ensure that the solution storage tank is filled with an appropriate amount of SBR glue solution (or other solutions that enhance the bonding force). Start the transmission mechanism to make it move forward at a predetermined constant speed, driving the current collector through the entrance of the coating oven. When the current collector enters the working range of the spraying mechanism, start the solution delivery pump. The solution delivery pump pumps out the SBR glue solution in the solution storage tank and transports it to the spray bar. The spray nozzles on the spray bar start to work, spraying the SBR glue solution evenly on the surface of the current collector in the form of a spray, ensuring that the glue solution can accurately cover the middle and lower parts of the current collector. After the spraying treatment, a thin layer of SBR glue solution will be formed on the surface of the current collector. This layer of glue solution enhances the adhesion of the subsequent slurry coating. A stable coating of SBR glue solution is formed on the surface of the current collector, and then the extrusion coating operation of the slurry can be carried out. The slurry will be more likely to combine with the SBR glue solution during coating, thereby enhancing the overall bonding strength of the negative electrode sheet. After coating, the current collector will continue to move forward under the drive of the transmission mechanism and enter the oven for drying treatment. Through the settings of the solution storage tank, the solution delivery pump and the spray bar, etc., it is possible to increase the bonding strength between the active material and the current collector, improve the bonding force, help reduce the problem of reduced bonding strength caused by the floating of the binder due to solvent volatilization during the drying process in the coating oven, improve the overall quality of the negative electrode sheet, and ensure the overall performance and stability of the subsequent battery.

[0008] Optionally, both the inlet end and the outlet end of the solution delivery pump are provided with delivery pipes. One of the delivery pipes is connected to the inside of the solution storage tank, and the other delivery pipe is connected to the spray bar.

[0009] By adopting the above technical solution, the solution delivery pump is respectively connected to the solution storage tank and the spray bar through the delivery pipes. Through the setting of the delivery pipes, the tightness of the solution during transportation is ensured, avoiding the possibility of solution leakage or splashing, and helping to ensure the safety and cleanliness of the production environment.

[0010] Optionally, the spray bar is provided with an interface for connecting to the delivery pipe, and a clamp for fixing is provided at the interface.

[0011] By adopting the above technical solution, the interface is integrally formed on the spray bar, and the delivery pipe is installed on the interface through a hoop; through the setting of the interface and the hoop, a firm connection between it and the spray bar can be ensured, further increasing the stability of the connection, preventing the delivery pipe from falling off or loosening due to vibration or pressure changes during transportation, and reducing the failure rate.

[0012] Optionally, an adjusting mechanism for adjusting the angle of the spray bar is provided on the fixed seat. The adjusting mechanism includes two adjusting supports and a servo motor. The two adjusting supports are respectively connected to both sides of the fixed seat. The two ends of the spray bar are respectively rotatably connected to the two adjusting supports. The servo motor is connected to the fixed seat, and the output end of the servo motor is connected to the end of the spray bar.

[0013] By adopting the above technical solution, the adjusting mechanism is installed on the fixed seat and includes two adjusting supports and a servo motor; when adjusting the angle of the spray bar, the servo motor is started, its output end starts to rotate, and the rotational power is transmitted to the spray bar through a certain transmission mechanism (such as gears, belts, etc., specifically depending on the design), thereby changing its spraying angle; through the setting of the two adjusting supports and the servo motor, precise control of the spray bar angle can be achieved, ensuring the consistency and high quality of the spraying effect, automatically completing the angle adjustment without manual intervention, and improving production efficiency and accuracy.

[0014] Optionally, a collecting funnel for collecting the dripping solution is provided on the fixed seat, and the collecting funnel is arranged below the spray bar.

[0015] By adopting the above technical solution, the collecting funnel is installed below the spray bar; through the setting of the collecting funnel, the solution dripping below the spray bar can be effectively collected, reducing the waste of raw materials, lowering the production cost, and improving the resource utilization efficiency, while keeping the workplace dry and clean.

[0016] Optionally, a return pipe is provided on the collecting funnel. The return pipe communicates with the solution storage tank, and a filter screen for filtering impurities is provided in the return pipe.

[0017] By adopting the above technical solution, the collecting funnel communicates with the solution storage tank through the return pipe, and at the same time the filter screen is installed in the return pipe; through the setting of the return pipe and the filter screen, the recycling of the solution is facilitated, which can not only reduce the waste of raw materials and lower the production cost, but also help improve the resource utilization efficiency. At the same time, the filtration by the filter screen can ensure that the solution flowing back into the solution storage tank is purer and meets the production requirements.

[0018] Optionally, the transmission mechanism includes two bearing seats and a conveying roller. The two bearing seats are arranged on the fixed seat, and the two ends of the conveying roller are respectively rotatably connected to the two bearing seats.

[0019] By adopting the above technical solution, the transmission mechanism includes two bearing seats and a conveying roller. Through the arrangement of the transmission mechanism, it helps to ensure the continuity and reliability of the transmission process, and reduce errors or failures caused by vibration or unstable factors.

[0020] Optionally, two lifting cylinders are arranged on the fixed seat. The two lifting cylinders are vertically arranged on the fixed seat, and the two lifting cylinders respectively correspond to the two bearing seats. The output end of the lifting cylinder is connected to the bottom of the bearing seat.

[0021] By adopting the above technical solution, the two lifting cylinders are installed on the fixed seat. Through the arrangement of the lifting cylinders, the lifting height of the bearing seat and the conveying roller can be accurately controlled, which can adapt to transmission scenarios with different height requirements and ensure the accuracy and stability of the transmission process.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] Through the arrangements of the solution storage tank, the solution delivery pump, and the spraying rod, etc., the bonding strength between the active material and the current collector can be increased, the bonding force can be improved, which helps to reduce the problem of the bonding strength reduction caused by the floating of the binder due to solvent volatilization during the drying process in the coating oven, improve the overall quality of the negative electrode sheet, and ensure the overall performance and stability of the subsequent battery;

[0024] Through the arrangements of the two adjusting supports and the servo motor, the accurate control of the angle of the spraying rod can be realized, ensuring the consistency and high quality of the spraying effect, the angle can be automatically adjusted without manual intervention, and the production efficiency and accuracy are improved;

[0025] Through the arrangements of the return pipe and the filter screen, it helps to realize the recycling of the solution. It can not only reduce the waste of raw materials and lower the production cost, but also help to improve the resource utilization efficiency. At the same time, the filtration of the filter screen can ensure that the solution flowing back to the solution storage tank is purer and meets the production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a device for strengthening the bonding force of a negative electrode sheet in an embodiment of the present application.

[0027] Figure 2 is a front view of a device for strengthening the bonding force of a negative electrode sheet in an embodiment of the present application.

[0028] Figure 3 is Figure 2 an enlarged view of part A in

[0029] Description of reference numerals: 1. Fixed seat; 2. Transmission mechanism; 21. Bearing seat; 22. Conveyor roller; 3. Spraying mechanism; 31. Solution storage tank; 32. Solution delivery pump; 33. Spray rod; 331. Spray opening; 34. Delivery pipe; 4. Interface; 41. Hoop; 5. Adjusting mechanism; 51. Adjusting support; 52. Servo motor; 6. Collection funnel; 7. Return pipe; 71. Filter screen; 8. Lifting oil cylinder. Detailed implementation manners

[0030] The following further elaborates on this application Figures 1 - 3 in conjunction with the accompanying drawings.

[0031] The embodiment of this application discloses a device for preparing an enhanced negative electrode sheet bonding force. Refer to Figure 1 , the device for preparing an enhanced negative electrode sheet bonding force includes a fixed seat 1. In this embodiment, the fixed seat 1 is installed at the entrance of the coating oven. A transmission mechanism 2 and a spraying mechanism 3 are installed on the fixed seat 1. The transmission mechanism 2 is used for transmission operations, and the spraying mechanism 3 is used for spraying operations.

[0032] Refer to Figure 2 , the transmission mechanism 2 includes conveyor rollers 22 and two bearing seats 21. The two bearing seats 21 are symmetrically installed on the fixed seat 1. The two ends of the conveyor roller 22 are respectively tensioned on the two bearing seats 21. The conveyor roller 22 rotates relative to the two bearing seats 21. In this embodiment, the conveyor roller 22 may be equipped with a driving member to ensure the continuity and reliability of the transmission process, and reduce errors or failures caused by vibration or unstable factors.

[0033] Refer to Figure 2 , two lifting oil cylinders 8 are installed on the fixed seat 1. The two lifting oil cylinders 8 respectively correspond to the two bearing seats 21. The lifting oil cylinders 8 are vertically installed on the fixed seat 1. The output ends of the lifting oil cylinders 8 are connected to the bottoms of the bearing seats 21. In this embodiment, the two lifting oil cylinders 8 are arranged at the same height and achieve synchronous driving, which can accurately control the lifting height of the bearing seats 21 and the conveyor rollers 22, adapt to transmission scenarios with different height requirements, and ensure the accuracy and stability of the transmission process.

[0034] Refer to Figure 2 , the spraying mechanism 3 is installed below the transmission mechanism 2. The spraying mechanism 3 includes a solution storage tank 31, a solution delivery pump 32, and a spray rod 33. The solution storage tank 31 is installed on the ground. The solution storage tank 31 is filled with an appropriate amount of sbr glue solution (or other solutions for enhancing bonding force). The solution delivery pump 32 and the spray rod 33 are both installed above the solution storage tank 31. The spray rod 33 is installed on the fixed seat 1. A number of spray openings 331 are opened on the spray rod 33. The number of spray openings 331 are sequentially opened along the length direction of the spray rod 33. Each spray opening 331 is arranged towards the direction of the conveyor roller 22.

[0035] Refer toFigure 2 and Figure 3 At both the inlet end and the outlet end of the solution delivery pump 32, delivery pipes 34 are installed. The delivery pipe 34 at the inlet end of the solution delivery pump 32 communicates with the inside of the solution storage tank 31. An interface 4 is integrally formed on the spray bar 33, and the interface 4 communicates with the inside of the spray bar 33. The delivery pipe 34 at the outlet end of the solution delivery pump 32 is sleeved and fixed on the interface 4. At the same time, a hoop 41 is installed at the interface 4, and the hoop 41 realizes the fixation of the delivery pipe 34 and the interface 4, further increasing the stability of the connection, preventing the delivery pipe 34 from falling off or loosening due to vibration or pressure changes during the delivery process, and reducing the failure rate.

[0036] Refer to Figure 2 , a collection funnel 6 is installed on the fixed seat 1. The collection funnel 6 is installed below the spray bar 33, which can effectively collect the solution dripping below the spray bar 33, reduce the waste of raw materials, lower the production cost, and improve the resource utilization efficiency. At the same time, it keeps the workplace dry and clean.

[0037] Refer to Figure 2 , a return pipe 7 is connected to the collection funnel 6. One end of the return pipe 7 away from the collection funnel 6 communicates with the inside of the solution storage tank 31. In this embodiment, a filter screen 71 is installed in the return pipe 7 for the recycling of the solution. It can not only reduce the waste of raw materials, lower the production cost, but also help improve the resource utilization efficiency. At the same time, the filtration of the filter screen 71 can ensure that the solution flowing back into the solution storage tank 31 is of purer quality and meets the production requirements.

[0038] Refer to Figure 2 , an adjusting mechanism 5 is installed on the fixed seat 1. In this embodiment, the adjusting mechanism 5 is used to adjust the angle of the spray bar 33. The adjusting mechanism 5 includes two adjusting supports 51 and a servo motor 52. The two adjusting supports 51 are respectively installed and fixed on the fixed seat 1, and the two adjusting supports 51 are respectively arranged on both sides of the fixed seat 1. Both ends of the spray bar 33 are rotatably installed on the two adjusting supports 51 through bearings, so that the spray bar 33 can rotate through the adjusting supports 51.

[0039] Refer to Figure 2 , the servo motor 52 is installed on the fixed seat 1. The output end of the servo motor 52 is connected to the end of the spray bar 33. In this embodiment, the centralized servo motor 52 can rotate forward and backward. The output end of the servo motor 52 can transmit the rotational power to the spray bar 33 through a transmission mechanism (such as gears, belts, etc.) to realize the slow rotation of the spray bar 33; it can realize the precise control of the angle of the spray bar 33, ensure the consistency and high quality of the spraying effect, can automatically complete the angle adjustment without manual intervention, and improve the production efficiency and accuracy.

[0040] The implementation principle of an apparatus for preparing an enhanced negative electrode sheet adhesion force in an embodiment of the present application is as follows: During the preparation of the negative electrode sheet, ensure that the solution storage tank 31 is filled with an appropriate amount of sbr adhesive solution (or other solutions for enhancing adhesion force). Start the transmission mechanism 2 to move forward at a predetermined constant speed, driving the current collector through the entrance of the coating oven. When the current collector enters the working range of the spraying mechanism 3, start the solution delivery pump 32. The solution delivery pump 32 extracts the sbr adhesive solution from the solution storage tank 31 and transports it into the spray bar 33. The spray nozzles 331 on the spray bar 33 start to work, spraying the sbr adhesive solution evenly on the surface of the current collector in the form of a spray, ensuring that the adhesive solution can accurately cover the middle and lower parts of the current collector. After spraying, a thin layer of sbr adhesive solution layer will be formed on the surface of the current collector. This layer of adhesive solution improves the adhesion force of the subsequent slurry coating. When a stable coating is formed on the surface of the current collector with the sbr adhesive solution, the extrusion coating operation of the slurry can be carried out. The slurry will be more likely to combine with the sbr adhesive solution during coating, thereby improving the overall adhesion force of the negative electrode sheet. After coating, the current collector will continue to move forward into the oven under the drive of the transmission mechanism 2 for drying treatment; through the settings of the solution storage tank 31, the solution delivery pump 32, the spray bar 33, etc., the bonding strength between the active material and the current collector can be increased, the adhesion force is improved, which helps to reduce the problem of the binder floating up due to solvent evaporation during the drying process in the coating oven and reducing the bonding strength, improves the overall quality of the negative electrode sheet, and ensures the overall performance and stability of the subsequent battery.

[0041] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A device for preparing a negative electrode sheet with enhanced bonding strength, characterized in that: The invention comprises a fixed seat (1) arranged at the entrance of a coating oven, wherein a transmission mechanism (2) and a spraying mechanism (3) are arranged on the fixed seat (1), wherein the spraying mechanism (3) is arranged below the transmission mechanism (2), wherein the spraying mechanism (3) comprises a solution storage tank (31), a solution delivery pump (32) and a spraying rod (33), wherein the solution storage tank (31) is arranged on the ground, wherein the inlet end of the solution delivery pump (32) is connected to the solution storage tank (31), wherein the outlet end of the solution delivery pump (32) is connected to the spraying rod (33), wherein the spraying rod (33) is connected to the fixed seat (1), wherein a plurality of spraying ports (331) are provided on the spraying rod (33), wherein the plurality of spraying ports (331) are all arranged in the direction of the transmission mechanism (2).

2. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 1, characterized in that: The inlet and outlet ends of the solution delivery pump (32) are both provided with delivery pipes (34), one of the delivery pipes (34) is connected to the solution storage tank (31), and the other delivery pipe (34) is connected to the spray rod (33).

3. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 2, characterized in that: The spray rod (33) is provided with an interface (4) for connecting with a delivery pipe (34), and a clamp (41) for fixing is provided at the interface (4).

4. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 1, characterized in that: The fixing seat (1) is provided with an adjustment mechanism (5) for adjusting the angle of the spray rod (33), the adjustment mechanism (5) comprising two adjustment supports (51) and a servo motor (52), the two adjustment supports (51) are respectively connected to two sides of the fixing seat (1), the two ends of the spray rod (33) are respectively rotatably connected to the two adjustment supports (51), the servo motor (52) is connected to the fixing seat (1), and the output end of the servo motor (52) is connected to the end of the spray rod (33).

5. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 1, characterized in that: The fixing seat (1) is provided with a collecting funnel (6) for collecting dripping solution, and the collecting funnel (6) is arranged below the spray rod (33).

6. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 5, characterized in that: The collecting funnel (6) is provided with a reflux pipe (7), the reflux pipe (7) is connected to the solution storage tank (31), and a filter screen (71) for filtering impurities is provided in the reflux pipe (7).

7. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 1, characterized in that: The transmission mechanism (2) comprises two bearing seats (21) and a conveying roller (22); the two bearing seats (21) are arranged on a fixed seat (1); and the two ends of the conveying roller (22) are rotatably connected to the two bearing seats (21).

8. The device for preparing a negative electrode sheet with enhanced bonding strength according to claim 7, characterized in that: Two lifting cylinders (8) are provided on the fixed seat (1). The two lifting cylinders (8) are vertically arranged on the fixed seat (1). The two lifting cylinders (8) correspond to two bearing seats (21) respectively. The output ends of the lifting cylinders (8) are connected to the bottom of the bearing seats (21).

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