Lithium ion battery diaphragm online coating liquid supply system and method

Abstract

The invention discloses a lithium ion battery diaphragm on-line coating liquid supply system which comprises a liquid storage tank, the liquid storage tank is provided with a liquid level monitoring module, the liquid level monitoring module is used for monitoring the liquid level height of coating liquid in the liquid storage tank, the liquid storage tank is connected with a coating head through a pipeline, and the pipeline is provided with a conveying module and a filtering module. And the coating liquid in the liquid storage tank is continuously conveyed to the coating head through the conveying module, and is subjected to impurity removal through the filtering module to coat the diaphragm. According to the coating liquid adding device, a user can add liquid into the liquid storage tank according to the liquid level monitoring module, and due to the fact that residual coating liquid exists in the liquid storage tank at the moment, the whole system and a production line do not need to be paused or interrupted during liquid adding, and the production efficiency can be improved; the coating head adopts a coil bar coating technology, so that the coating precision, uniformity and stability of the diaphragm are improved; impurities and particles in the coating liquid can be effectively removed through a multi-stage filtering mode, the coating head is prevented from being blocked, and the coating efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery manufacturing, and in particular to an online coating and liquid supply system and method for a lithium ion battery diaphragm. Background Art

[0002] Lithium-ion battery is a secondary battery, i.e. a rechargeable battery, which mainly relies on the movement of lithium ions between the positive and negative electrodes to work. With the widespread application of lithium-ion batteries in electronic devices, electric vehicles and other fields, the requirements for the performance of lithium-ion batteries are constantly increasing. As a key component of the battery, the quality of lithium-ion battery separator directly affects the safety and performance of the battery.

[0003] In the production process of lithium-ion battery separators, the coating process is an important link to improve the performance of separators. However, the current lithium-ion battery separator coating liquid supply device sprays the coating liquid in the liquid storage tank onto the separator surface through a nozzle during liquid supply, but the accuracy of this spraying method is poor, and when the entire system has equipment problems during the spraying process, the entire liquid supply system and production line need to be suspended for inspection and maintenance, which affects the efficiency and spraying stability, and it is difficult to meet the production needs of high-quality lithium-ion battery separators. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems of the background technology and to provide a lithium-ion battery separator online coating liquid supply system and method.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A lithium-ion battery diaphragm online coating liquid supply system comprises: a liquid storage tank, the liquid storage tank is provided with a liquid level monitoring module, the liquid level monitoring module is used to monitor the liquid level height of the coating liquid in the liquid storage tank, the liquid storage tank is connected to a coating head through a pipeline, a conveying module and a filtering module are provided on the pipeline, the coating liquid in the liquid storage tank is continuously conveyed to the coating head through the conveying module, and then coated on the diaphragm after impurities are removed through the filtering module.

[0007] As a further solution of the present invention: the delivery module includes a delivery pump, the delivery pump is connected to a controller, and the controller is used to adjust the output flow of the delivery pump.

[0008] As a further solution of the present invention: the filtration module includes a filter, a flow meter is arranged on one side of the filter, and the flow meter is used to monitor in real time the flow of the coating liquid after multi-stage filtration by the filter.

[0009] As a further solution of the present invention: the liquid level monitoring module includes a liquid level sensor and an alarm, and the alarm is used to convert the signal sent by the liquid level sensor into an audible and visual alarm signal.

[0010] A method for online coating and liquid supply of a lithium ion battery separator, comprising:

[0011] S1. Assemble the structure of the online coating liquid supply system for lithium-ion battery separators, preset a liquid supply parameter, initialize the system, and read the preset liquid supply parameter;

[0012] S2, turn on the system, the liquid level sensor monitors the liquid level in the liquid storage tank in real time, and determines whether the liquid level is lower than the set value, and sends a signal to the alarm according to the judgment result;

[0013] S3, when the delivery pump delivers the coating liquid in the liquid storage tank to the coating head, the filter filters the coating liquid;

[0014] S4, the flow meter transmits the real-time flow data of the coating liquid to the controller;

[0015] S5, the controller adjusts the output flow rate of the delivery pump according to the flow data transmitted by the flow meter and the preset liquid supply parameters;

[0016] S6. The coating head coats the filtered coating liquid on the surface of the lithium-ion battery separator to complete the online coating process.

[0017] As a further solution of the present invention: in step S1, system initialization includes:

[0018] S11, adjusting the position of the liquid level sensor in the liquid storage tank;

[0019] S12. Preset the flow parameters of the delivery pump according to the coating process requirements;

[0020] S13, calibrate the flow meter;

[0021] S14, programming and debugging controller;

[0022] S15. Adjust the coating head according to coating process requirements.

[0023] As a further solution of the present invention: in step S6, during the coating process, the coating head needs to determine whether a system failure occurs, and if so, eliminate the failure.

[0024] As a further solution of the present invention: the troubleshooting method is: analyzing the cause of the fault according to the indication of the liquid level sensor, the output flow indication of the delivery pump, and the indication of the flow meter, and replacing the faulty component.

[0025] Beneficial effects of the present invention:

[0026] (1) In the present invention, the user can add liquid to the liquid storage tank according to the liquid level monitoring module. Since there is still residual coating liquid in the liquid storage tank at this time, there is no need to pause or interrupt the entire system and production line when adding liquid, which can improve production efficiency.

[0027] (2) In the present invention, the coating head adopts wire rod coating technology to improve the coating accuracy, uniformity and stability of the diaphragm.

[0028] (3) In the present invention, the multi-stage filtration method can effectively remove impurities and particles in the coating liquid, prevent clogging of the coating head, and improve coating efficiency.

[0029] (4) In the present invention, the controller adjusts the output flow of the delivery pump according to the flow data transmitted by the flow meter and the preset liquid supply parameters, thereby realizing automatic adjustment of the liquid supply, further improving the automation and accuracy of the liquid supply process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a structural schematic diagram of the on-line coating and liquid supply system for lithium ion battery separators of the present invention;

[0032] Figure 2 It is a schematic flow chart of the on-line coating and liquid supply method for lithium ion battery separator of the present invention.

[0033] In the figure: 1. Liquid storage tank; 2. Liquid level sensor; 3. Display screen; 4. Alarm; 5. Delivery pump; 6. Controller; 7. Filter; 8. Coating head; 9. Flow meter. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 As shown, the present invention is an online coating and liquid supply system for lithium-ion battery diaphragms, comprising: a liquid storage tank 1, a liquid level monitoring module is provided in the liquid storage tank 1, and the liquid level monitoring module is used to monitor the liquid level height of the coating liquid in the liquid storage tank 1.

[0036] Among them, the liquid level monitoring module includes a liquid level sensor 2 and an alarm 4, the liquid level sensor 2 is arranged in the liquid storage tank 1, the alarm 4 is arranged outside the liquid storage tank 2, and the liquid level sensor 2 is electrically connected to the alarm 4. Liquid level sensors include but are not limited to float sensors, capacitive sensors, ultrasonic sensors and radar sensors. The float sensor can detect the height of the liquid level by using the buoyancy change of the float. The float is equipped with a switch, and when the liquid level reaches a certain height, the switch can be triggered. The capacitive sensor can judge the liquid level by detecting the change of capacitance, which is suitable for non-contact liquid level monitoring. The acoustic wave sensor uses the principle of ultrasonic reflection to measure the distance between the liquid surface and the sensor, thereby judging the liquid level. The radar sensor uses microwave radar technology and is suitable for liquid level monitoring in high temperature, high pressure or steam environment. Preferably, a float sensor is used.

[0037] The liquid level sensor 2 monitors the liquid level of the coating liquid in the liquid storage tank 1. The liquid level sensor 2 sends an electrical signal to the alarm 4. The alarm 4 receives the signal from the liquid level sensor 2 and processes it to determine whether the preset liquid level threshold is reached. If the liquid level threshold is reached, the alarm 4 converts the received signal from the liquid level sensor 2 into an audible and visual alarm signal, and sends an alarm sound through a buzzer or a speaker, or displays the alarm status through a flashing light. The user can add liquid to the liquid storage tank 1 according to the alarm sound or the flashing light prompt. Since there is still residual coating liquid in the liquid storage tank 1 at this time, there is no need to pause or interrupt the entire system and production line when adding liquid.

[0038] The inventors found that in the prior art, impurities and particles in the coating liquid easily clog the coating head. Each time a clog occurs, the entire liquid supply system and production line need to be suspended to clean the coating head. In addition, the spraying is prone to uniformity problems, requiring a re-coating process.

[0039] In this embodiment, the liquid storage tank 1 is connected to the coating head 8 through a pipeline. The coating head 8 adopts 8-wire rod coating technology, which can achieve high-precision and high-uniformity coating. The wire rod coating technology uses a coating tool with a specific shape (a wire rod is used in this embodiment) to evenly coat the coating liquid on the diaphragm through contact with the surface of the diaphragm. The wire rod is usually made of metal or plastic, and has lines or grooves on the surface to help control the thickness and uniformity of the coating. Compared with the spraying technology in the prior art, the coating head 8 adopts a wire rod coating method, which can improve the accuracy of coating liquid coating, and the coating is uniform and controllable; it is suitable for coating liquids of different viscosities, and can also be applied to different substrates. The operation process is simple and fast, and it is easy to implement and maintain.

[0040] Furthermore, a conveying module and a filtering module are also arranged on the pipeline.

[0041] Specifically, the delivery module includes a delivery pump 5, and the coating liquid in the liquid storage tank 1 is continuously delivered to the coating head 8 through the delivery pump 5. The delivery pump 5 is connected to the controller 6. The controller 6 can read the preset liquid supply parameters and automatically adjust the output flow of the delivery pump 5 according to these parameters to ensure the consistency and repeatability of the coating process. The filtering module includes a filter 7, and the filter 7 uses a multi-stage filtering method to filter and remove impurities from the coating liquid. The filter 7 can use a bag filter, a multi-media filter, a pipeline filter or a cyclone filter. In this embodiment, a pipeline filter is used. The pipeline filter is a pipeline that is provided with multiple mesh or filter element structures in the pipeline, so that the coating liquid can be filtered step by step in multiple layers, which not only improves the filtering effect, but also improves the service life of the subsequent coating head 8. A flow meter 9 is set on one side of the filter 7, and the flow meter 9 is electrically connected to the controller 6. The flow meter 9 is used to monitor the flow of the coating liquid after multi-stage filtration by the filter 7 in real time, and transmit the data to the controller 6. The controller 6 adjusts the output of the delivery pump 5 according to these data to achieve automatic adjustment of the liquid supply, further improving the automation and accuracy of the liquid supply process.

[0042] In this embodiment, the coating liquid in the liquid storage tank 1 is transported to the coating head 8 through the delivery pump 5, and the coating head 8 coats the coating liquid on the surface of the diaphragm. During the process of the coating liquid being transported, the filter 7 performs multi-stage filtration on the coating liquid, and the flow meter 9 monitors in real time and feeds back the monitoring results to the controller 6. At the same time, the liquid level sensor 2 monitors the liquid level in the liquid storage tank 1. When the liquid level reaches the warning line, the alarm 4 sounds an alarm, and the user replenishes the liquid in the liquid storage tank 1.

[0043] See also Figure 1-Figure 2 As shown, a method for online coating and liquid supply of a lithium-ion battery separator comprises:

[0044] S1. Assemble the structure of the online coating liquid supply system for lithium-ion battery separators, preset a liquid supply parameter according to the characteristics of the coating liquid and the coating process requirements, the liquid supply parameter includes but is not limited to the viscosity, density, coating speed, and coating amount of the coating liquid, initialize the system, and read the preset liquid supply parameter.

[0045] During assembly, it is necessary to determine whether the chemical composition of the coating liquid is compatible with the corrosion-resistant coating on the inner wall of the liquid storage tank 1 to avoid chemical reactions. If it is incompatible, other liquid storage tanks 1 need to be replaced. After confirmation, the used liquid storage tank 1 can be installed in a position that is convenient for operation and maintenance.

[0046] System initialization includes:

[0047] S11 . Adjust the position of the liquid level sensor 2 in the liquid storage tank 1 to ensure accurate monitoring of the liquid level in the liquid storage tank 1 .

[0048] S12, presetting the flow parameters of the delivery pump 5 according to the coating process requirements.

[0049] S13, calibrating the flow meter 9 to ensure its measurement accuracy, and installing the flow meter 9 at the output port of the delivery pump 5 to accurately monitor the coating liquid flow rate.

[0050] S14, programming the controller 6 so that it can read the data of the liquid level sensor 2 and the flow meter 9, and debugging the controller 6 to ensure that it can adjust the output of the delivery pump 5 according to the real-time data.

[0051] S15. Adjust the coating head 8 according to the coating process requirements to ensure that the wire rod coating technology of the coating head 8 can achieve the required coating accuracy and uniformity.

[0052] S2, start the system, the liquid level sensor 2 monitors the liquid level in the liquid storage tank 1 in real time, and determines whether the liquid level is lower than the set value (liquid level threshold), and sends a signal to the alarm 4 according to the determination result.

[0053] The liquid level sensor 2 monitors the liquid level of the coating liquid in the liquid storage tank 1. The liquid level sensor 2 sends an electrical signal to the alarm 4. The alarm 4 receives the signal from the liquid level sensor 2 and processes it to determine whether the preset liquid level threshold is reached. If the liquid level threshold is reached, the alarm 4 converts the received signal from the liquid level sensor 2 into an audible and visual alarm signal, and sends an alarm sound through a buzzer or a speaker, or displays the alarm status through a flashing light. The user can add liquid to the liquid storage tank 1 according to the alarm sound or the flashing light prompt. Since there is still residual coating liquid in the liquid storage tank 1 at this time, there is no need to pause or interrupt the entire system and production line when adding liquid, which can improve production efficiency.

[0054] In addition, the alarm 4 provides early warning in two ways: alarm sound and flashing light, which can avoid the impact of alarm 4 failure on production. When only one of the flashing light and alarm sound is used for early warning, the alarm 4 needs to be replaced or repaired.

[0055] S3, when the delivery pump 5 delivers the coating liquid in the liquid storage tank 1 to the coating head 8, the filter 7 filters the coating liquid, and the filtered coating liquid is delivered to the coating head 8, and the flow meter 9 monitors in real time the flow rate of the coating liquid after multi-stage filtration by the filter 7. The multi-stage filtration method of the filter 7 can effectively remove impurities and particles in the coating liquid, prevent clogging of the coating head 8, and improve the coating efficiency.

[0056] S4 , the flow meter 9 transmits the real-time flow data of the coating liquid to the controller 6 .

[0057] S5, the controller 6 adjusts the output flow rate of the delivery pump 5 according to the flow data transmitted by the flow meter 9 and the preset liquid supply parameters, thereby realizing automatic adjustment of the liquid supply, further improving the automation and accuracy of the liquid supply process. Through the coordinated use of the delivery pump 5 and the flow meter 9, the flow rate of the coating liquid can be accurately controlled, waste can be reduced, and production costs can be reduced. Since the delivery of the coating liquid is a continuous process, the output flow rate of the delivery pump 5 is also a fine-tuning process even if it is adjusted in real time by the controller 6, and there is no cliff-like change in its output flow rate, which can be judged by the indication of the flow meter 9.

[0058] S6, the coating head 8 coats the filtered coating liquid on the surface of the lithium-ion battery separator to complete the online coating process.

[0059] In the present invention, the on-line coating liquid supply method for lithium-ion battery separators can realize automatic on-line coating liquid supply for lithium-ion battery separators, improve the accuracy and stability of liquid supply, and ensure coating quality.

[0060] During the coating process, the coating head 8 needs to determine whether a system failure occurs, and if so, eliminate the failure.

[0061] The troubleshooting method is: analyze the cause of the fault according to the indication of the liquid level sensor 2, the output flow indication of the delivery pump 5, and the indication of the flow meter 9, and replace the faulty parts.

[0062] Specifically, if the remaining components are normal, and the coating liquid continues to be output from the coating head 8, but the reading of the liquid level sensor 2 remains unchanged, the liquid level sensor 2 is faulty, and the liquid level sensor 2 needs to be replaced or repaired when the coating liquid in the liquid storage tank 1 does not reach the liquid level threshold. If the reading of the flow meter 9 changes abruptly, it can be determined that the flow meter 9 is faulty, or the filter 7 is faulty (because the filter 7 is filtered by multiple stages, its filtering time is slow, if there is blockage or the filter element is damaged, it will cause the reading of the flow meter 9 to change significantly). At this time, observe the output flow reading of the delivery pump 5 displayed on the controller 6. If the output flow reading does not change significantly, the flow meter 9 is faulty. If the output flow reading also changes abruptly, the filter 7 is faulty.

[0063] By real-time monitoring of liquid level and flow data, problems can be quickly discovered and handled to ensure the continuity and stability of production.

[0064] In addition, the automatic liquid supply device and method of the present invention have the advantages of simple structure, convenient operation, high reliability, etc., and are suitable for large-scale production.

[0065] Working principle: The coating liquid in the liquid storage tank 1 is transported to the coating head 8 through the delivery pump 5, and the coating head 8 coats the coating liquid on the surface of the diaphragm. During the process of the coating liquid being transported, the filter 7 performs multi-stage filtration on the coating liquid, and the flow meter 9 monitors in real time and feeds back the monitoring results to the controller 6. At the same time, the liquid level sensor 2 monitors the liquid level in the liquid storage tank 1. When the liquid level reaches the warning line, the alarm 4 sounds an alarm, and the user replenishes the liquid in the liquid storage tank 1.

[0066] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A lithium-ion battery separator online coating liquid supply system, characterized in that: include: A liquid storage tank (1), wherein the liquid storage tank (1) is provided with a liquid level monitoring module, and the liquid level monitoring module is used to monitor the liquid level height of the coating liquid in the liquid storage tank (1); The liquid storage tank (1) is connected to the coating head (8) via a pipeline, and a conveying module and a filtering module are arranged on the pipeline; The coating liquid in the liquid storage tank (1) is continuously transported to the coating head (8) through the transport module, and then coated on the diaphragm after impurities are removed through the filter module.

2. The on-line coating and liquid supply system for lithium-ion battery separator according to claim 1, characterized in that: The delivery module comprises a delivery pump (5), wherein the delivery pump (5) is connected to a controller (6), and the controller (6) is used to adjust the output flow of the delivery pump (5).

3. The on-line coating and liquid supply system for lithium-ion battery separator according to claim 2, characterized in that: The filtering module comprises a filter (7), a flow meter (9) is arranged on one side of the filter (7), and the flow meter (9) is used to monitor in real time the flow of the coating liquid after multi-stage filtration by the filter (7).

4. The on-line coating and liquid supply system for lithium-ion battery separator according to claim 1, characterized in that: The liquid level monitoring module comprises a liquid level sensor (2) and an alarm (4), wherein the alarm (4) is used to convert a signal emitted by the liquid level sensor (2) into an audible and visual alarm signal.

5. A method for using the on-line coating liquid supply system for lithium ion battery separator according to any one of claims 1 to 4, characterized in that: include: S1. Assemble the structure of the online coating liquid supply system for lithium-ion battery separators, preset a liquid supply parameter, initialize the system, and read the preset liquid supply parameter; S2, start the system, the liquid level sensor (2) monitors the liquid level in the liquid storage tank (1) in real time, and determines whether the liquid level is lower than a set value, and sends a signal to the alarm (4) according to the determination result; S3, when the delivery pump (5) delivers the coating liquid in the liquid storage tank (1) to the coating head (8), the filter (7) filters the coating liquid; S4, the flow meter (9) transmits the real-time flow data of the coating liquid to the controller (6); S5, the controller (6) adjusts the output flow rate of the delivery pump (5) according to the flow rate data transmitted by the flow meter (9) and the preset liquid supply parameters; S6. The coating head (8) coats the filtered coating liquid on the surface of the lithium-ion battery separator to complete the online coating process.

6. The method according to claim 5, characterized in that: In step S1, system initialization includes: S11, adjusting the position of the liquid level sensor (2) in the liquid storage tank (1); S12, presetting the flow parameters of the delivery pump (5) according to the coating process requirements; S13, calibrating the flow meter (9); S14, programming and debugging controller (6); S15, adjusting the coating head (8) according to coating process requirements.

7. The method according to claim 5, characterized in that: In step S6, during the coating process, the coating head (8) needs to determine whether a system fault occurs, and if so, eliminate the fault.

8. The method according to claim 7, characterized in that: The fault elimination method is: analyzing the cause of the fault according to the indication of the liquid level sensor (2), the output flow indication of the delivery pump (5), and the indication of the flow meter (9), and replacing the faulty component.

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