Device and method for detecting point height of lithium ion spraying diaphragm on line

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a device for detecting the point height of a lithium ion spraying diaphragm on line, which comprises a diaphragm spraying module, a laser measurement module, a scanning driving module, a data acquisition and processing module, a real-time feedback control module and a display and alarm module. According to the device and the method for detecting the point height of the lithium ion spraying diaphragm on line, accurate measurement of the point height in diaphragm production is realized, so that the quality of the diaphragm is monitored and controlled in real time, and the product quality and the product yield can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a device and method for online detection of lithium ion spraying diaphragm point height. Background Art

[0002] Lithium-ion battery separator is one of the key components of lithium-ion batteries. Its main function is to separate the positive and negative electrode materials of the battery, prevent short circuits, and allow lithium ions in the electrolyte to pass through to realize the charging and discharging process. The separator is usually made of polymer materials such as polyolefins (such as polyethylene PE and polypropylene PP) and has a microporous structure. These micropores allow lithium ions to pass through but prevent electrons from passing through. The main performance requirements of the separator include thickness uniformity, mechanical properties (such as tensile strength and puncture resistance), air permeability, and physical and chemical properties (such as wettability, chemical stability, thermal stability and safety).

[0003] The point height uniformity of lithium-ion sprayed diaphragms refers to whether the height or thickness distribution of each point on the surface of the diaphragm is uniform during the spraying process. In the production of lithium-ion batteries, the point height uniformity of lithium-ion sprayed diaphragms has an important impact on battery performance and quality. Specifically, the thickness uniformity of the diaphragm directly affects the charging and discharging performance of lithium-ion batteries. If the thickness of the diaphragm is uneven, it may cause uneven distribution of internal resistance of the battery, thereby affecting the overall performance of the battery; during the charging and discharging process of the battery, the diaphragm with uneven thickness is prone to local overheating, short circuit and other safety hazards, posing a threat to the safety performance of the battery.

[0004] However, existing detection methods are often unable to achieve real-time, online, and high-precision detection, which leads to difficulties in quality control during the production process and easily produces unqualified products. Summary of the invention

[0005] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a device and method for online detection of the point height of lithium ion spraying diaphragms, so as to realize the accurate measurement of the point height in diaphragm production, thereby monitoring and controlling the quality of the diaphragm in real time, thereby ensuring product quality and product yield.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a device for online detection of lithium ion spraying diaphragm point height, comprising:

[0008] The diaphragm spraying module includes a diaphragm transmission mechanism, a diaphragm spraying mechanism and a battery diaphragm base film, wherein the diaphragm transmission mechanism is used to transmit the battery diaphragm base film, and the diaphragm spraying mechanism is used to spray the coating slurry on the surface of the battery diaphragm base film, and the coating slurry forms a spraying diaphragm point on the surface of the battery diaphragm base film after being cured;

[0009] A laser measurement module is used to measure the distance between itself and the spraying membrane point on the surface of the battery membrane base film, and generate real-time distance information;

[0010] Scanning drive module, the scanning drive module is used to drive the laser measurement module to move;

[0011] A data acquisition and processing module, which is used to receive real-time distance information from the laser measurement module, and process and analyze the real-time distance information;

[0012] Real-time feedback control module, the real-time feedback control module is connected with the data acquisition and processing module,

[0013] The display and alarm module is connected to the laser measurement module, the data acquisition and processing module and the real-time feedback control module respectively.

[0014] Furthermore, the diaphragm transmission mechanism is divided into a coating spraying area and a scanning measurement area, the diaphragm spraying mechanism is arranged in the coating spraying area, and the laser measurement module and the scanning drive module are both located in the scanning measurement area.

[0015] Furthermore, the diaphragm spraying mechanism is provided with a flow meter and a throttle valve for adjusting the spraying speed and the spraying pressure during the spraying of the coating slurry.

[0016] Furthermore, the laser measurement module is a high-precision laser displacement sensor.

[0017] Further, the process of processing and analyzing the real-time distance information by the data acquisition and processing module is as follows: the data acquisition and processing module receives the real-time distance information from the laser measurement module, and compares the real-time distance information with a preset standard range;

[0018] The process of comparing the real-time distance information with the preset standard range is as follows:

[0019] If the real-time distance information is within the preset standard range, it means that the diaphragm spray module is working properly;

[0020] If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module is working abnormally. The data acquisition and processing module generates abnormal information and transmits the real-time distance information and the abnormal information to the real-time feedback control module. The real-time feedback control module issues an adjustment instruction based on the real-time distance information and the abnormal information to adjust the spraying parameters of the diaphragm spray mechanism in the diaphragm spray module.

[0021] Furthermore, the spraying parameters include coating slurry nozzle speed and coating slurry spraying pressure.

[0022] Furthermore, the display and alarm module is used to receive real-time distance information from the laser measurement module and display it.

[0023] Furthermore, the display and alarm module is also used to issue an alarm message under abnormal circumstances.

[0024] In a second aspect, the present invention provides a method for detecting the height of a lithium ion spraying diaphragm point online, the method comprising the following steps:

[0025] S1: using a diaphragm transmission mechanism to transmit the battery diaphragm base film, during the transmission process, using a diaphragm spraying mechanism to spray a coating slurry on the surface of the battery diaphragm base film, and after the coating slurry is cured, a spraying diaphragm point is formed on the surface of the battery diaphragm base film;

[0026] S2: The battery diaphragm with the sprayed diaphragm point formed on the surface continues to be transmitted to the measurement area of ​​the laser measurement module. The laser measurement module measures the height of the sprayed diaphragm point on the surface of the battery diaphragm, obtains the real-time distance information of the sprayed diaphragm point, and transmits the real-time distance information to the data acquisition and processing module;

[0027] S3: The data acquisition and processing module receives the real-time distance information transmitted from the laser measurement module, and compares the real-time distance information with the preset standard range, and issues adjustment instructions according to the comparison result to adjust the spraying parameters of the diaphragm spraying module.

[0028] Furthermore, in step S3, the specific process of comparing the real-time distance information with the preset standard range is as follows:

[0029] If the real-time distance information is within the preset standard range, it means that the diaphragm spraying module is working normally, and the data acquisition and processing module transmits the real-time distance information to the real-time feedback control module, and the real-time feedback control module monitors the normal operation of the diaphragm spraying module;

[0030] If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module is working abnormally. The data acquisition and processing module generates abnormal information and transmits the real-time distance information and the abnormal information to the real-time feedback control module. The real-time feedback control module issues an adjustment instruction based on the real-time distance information and the abnormal information to adjust the spraying parameters of the diaphragm spray mechanism in the diaphragm spray module.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides a laser measurement module which uses a high-precision laser displacement sensor to ensure accurate measurement of the point height of the lithium-ion battery spray diaphragm, thereby improving detection accuracy.

[0033] 2. In the present invention, a scanning driving module is used to drive the laser measuring module to move, thereby realizing point-by-point scanning measurement of the diaphragm, thereby improving the efficiency and coverage of the measurement.

[0034] 3. In the present invention, data processing and real-time feedback are realized through the data acquisition and processing module; specifically, the data acquisition and processing module can collect and process the measurement data in real time to ensure the accuracy and timeliness of the data, and at the same time transmit the processing results of the real-time collection and measurement data to the real-time feedback control module, and the real-time feedback control module can adjust the spraying process according to the processing results.

[0035] 4. In the present invention, the quality of the lithium-ion battery spray diaphragm is controlled by comparing the measured point height data with the preset standard range.

[0036] 5. In the present invention, a display and alarm module is provided, which can perform abnormality detection and alarm. Specifically, the display and alarm module can send out an alarm signal when an abnormality is detected, and promptly remind the operator or the system to handle it.

[0037] 6. The device for online detection of lithium-ion spray diaphragm point height provided by the present invention also has good adaptability. Specifically, the preset standard range can be adjusted according to the performance requirements and production process of the lithium-ion battery, which increases the adaptability and flexibility of the device, ensures product quality, and optimizes the production process through real-time feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0039] Figure 1 It is a structural schematic diagram of the present invention.

[0040] Among them, the accompanying drawings are marked as: 1. diaphragm spraying module; 2. laser measurement module; 3. scanning drive module; 4. data acquisition and processing module; 5. real-time feedback control module; 6. display and alarm module; 11. diaphragm spraying mechanism; 111. flow meter; 112. throttle valve. DETAILED DESCRIPTION

[0041] 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.

[0042] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] First, as Figure 1 As shown, the present invention provides an online device for detecting the height of a lithium ion spraying diaphragm, comprising a diaphragm spraying module 1, a laser measuring module 2, a scanning driving module 3, a data acquisition and processing module 4, a real-time feedback control module 5 and a display and alarm module 6, specifically:

[0044] The diaphragm spraying module 1 includes a diaphragm transmission mechanism, a diaphragm spraying mechanism 11 and a battery diaphragm base film. The diaphragm transmission mechanism is used to transmit the battery diaphragm base film. The diaphragm transmission mechanism is divided into a coating spraying area and a scanning measurement area. The diaphragm spraying mechanism 11 is arranged in the coating spraying area. The laser measurement module 2 and the scanning drive module 3 are both located in the scanning measurement area.

[0045] The battery diaphragm base film is first transported through the coating spraying area, sprayed with coating slurry on its surface by the diaphragm spraying mechanism 11, and then passed through the scanning measurement area to detect the spraying diaphragm points;

[0046] Specifically, the diaphragm spraying mechanism 11 adopts a double spraying mechanism with a built-in spraying slurry, which is used to spray the coating slurry on the surface of the battery diaphragm base film, wherein the diaphragm spraying mechanism 11 is provided with a flow meter 111 and a throttle valve 112, which are used to adjust the spraying speed and spraying pressure during the spraying of the coating slurry; after the battery diaphragm base film sprayed with the coating slurry is cured, the coating slurry is cured on the surface of the battery diaphragm base film to form a sprayed diaphragm point; the battery diaphragm base film with the sprayed diaphragm point formed on the surface continues to be transmitted via the diaphragm transmission mechanism, and is transmitted to the scanning measurement area to wait for the laser measurement module 2 to measure;

[0047] Laser measurement module 2, laser measurement module 2 is arranged in the scanning measurement area, laser measurement module 2 is used to measure the distance between itself and the spraying membrane point on the surface of the battery membrane base film, and generate real-time distance information, the laser measurement module 2 is also used to transmit the real-time distance information to the data acquisition and processing module 4;

[0048] Among them, the laser measurement module 2 uses a high-precision laser displacement sensor as a measurement tool, which can improve the accuracy and reliability of the measurement;

[0049] Scanning drive module 3, the scanning drive module 3 is used to drive the laser measuring module 2 to move in the scanning measuring area, and then can fully scan the battery diaphragm base film in the scanning measuring area. The scanning drive module 3 can use a conventional linear transmission component such as a linear guide rail or a screw transmission, wherein the motor in the scanning drive module 3 uses a high-precision motor to improve the accuracy and stability of the transmission process;

[0050] Data acquisition and processing module 4, the data acquisition and processing module 4 is used to receive the real-time distance information from the laser measurement module 2, and process and analyze the real-time distance information. Specifically, data processing and analysis usually include the following processes: 1. Data cleaning: remove invalid or erroneous data points; 2. Data conversion: convert the original data into a useful format, such as converting the intensity of laser reflection into a height value; 3. Data analysis: analyze the data to determine whether the diaphragm point height is within the preset standard range; 4. Abnormal detection: identify abnormal values ​​or trends in the data, which may indicate quality problems; 5. Real-time feedback: according to the analysis results, adjust the spraying process parameters in real time to ensure product quality;

[0051] The data acquisition and processing module 4 uses a high-speed data acquisition card and a high-performance processor, which can quickly process a large amount of measurement data and provide decision support for real-time feedback.

[0052] The specific process of processing and analyzing the real-time distance information is as follows: the data acquisition and processing module 4 receives the real-time distance information from the laser measurement module 2, calculates each real-time distance information, and compares the real-time distance information with a preset standard range; specifically, the comparison process is as follows:

[0053] Case 1: If the real-time distance information is within the preset standard range, it means that the diaphragm spraying module 1 is working properly and the diaphragm spraying module 1 is operating normally;

[0054] Case 2: If the real-time distance information is not within the preset standard range, it means that the diaphragm spraying module 1 is working abnormally, and the real-time distance information and abnormal information are transmitted to the real-time feedback control module 5. The real-time feedback control module 5 issues an adjustment instruction according to the height of the measuring point and the abnormal information to adjust the process parameters of the diaphragm spraying module 1;

[0055] The process parameters include the spraying speed, spraying pressure, spraying flow rate during the process of spraying the coating slurry by the diaphragm spraying mechanism 11 and the distance between the spraying head of the double spraying mechanism and the battery diaphragm base film;

[0056] The real-time feedback control module 5 is connected to the data acquisition and processing module 4, and the spraying process is adjusted in real time according to the processing results of the data acquisition and processing module 4; specifically, the process may include the following steps:

[0057] Step 1, receiving data: the real-time feedback control module 5 receives the measurement data from the data acquisition and processing module 4;

[0058] Step 2, data analysis: Analyze these data to determine whether the height of the diaphragm point is within the preset standard range;

[0059] Step 3, comparison standard: compare the measured data with the preset standard range, specifically, these standard ranges are determined according to the performance requirements and production process of lithium-ion batteries;

[0060] Step 4, generating adjustment instructions: if the measured data is within the standard range, the real-time feedback control module 5 may not take any action, or continue monitoring; if the measured data exceeds the standard range, the real-time feedback control module 5 will generate an adjustment instruction;

[0061] Step 5, adjusting process parameters: According to the generated adjustment instructions, the real-time feedback control module 5 adjusts the parameters of the spraying process, and these parameters may include: (1) changing the spraying speed; (2) adjusting the spraying pressure; (3) changing the flow rate when spraying the coating slurry; (4) adjusting the distance between the spray head of the double spray mechanism and the battery separator base film;

[0062] Step 6, monitoring the adjustment effect: After the adjustment, the real-time feedback control module 5 continues to monitor the new measurement data to ensure that the adjustment is effective and the point height is controlled within a suitable range;

[0063] Step 7, cyclic feedback: This process is cyclical, and the real-time feedback control module 5 continuously receives new data, analyzes it, and makes adjustments as needed;

[0064] Step 8, abnormality handling: If the data still exceeds the standard range after adjustment, or other abnormal conditions occur, the real-time feedback control module 5 may trigger the display and alarm module to send an alarm signal, prompting the operator to conduct further inspection or manual intervention;

[0065] Step 9, recording and reporting: The real-time feedback control module 5 may also record all measurement data and adjustment history for subsequent analysis and reporting;

[0066] Step 10, adaptive learning: In some advanced systems, the real-time feedback control module 5 may include an adaptive learning algorithm that can self-optimize and adjust the strategy based on historical data to improve accuracy and response speed;

[0067] This process ensures that the dot height can be precisely controlled during the production of lithium-ion battery spray separators, thereby ensuring product quality and consistency;

[0068] Display and alarm module 6, which is connected to laser measurement module 2, data acquisition and processing module 4 and real-time feedback control module 5 respectively;

[0069] The display and alarm module 6 is used to receive the real-time distance information from the laser measurement module 2 and display it;

[0070] The display and alarm module 6 is also used to issue alarm information in abnormal situations. Specifically, the abnormal situations that may need to be handled include but are not limited to: 1. The measurement data exceeds the preset range: If the real-time feedback control module 5 finds that the diaphragm point height data exceeds the set standard range after analysis, the display and alarm module 6 will issue a visual and / or auditory alarm to notify the operator to check or automatically trigger the adjustment mechanism; 2. System failure: including hardware failure or software error of the laser measurement module 2, the scanning drive module 3, and the data acquisition and processing module 4; 3. Communication failure: when there is a problem with the communication between modules (such as between the laser measurement module 2 and the scanning drive module 3, the data acquisition and processing module 4 and the real-time feedback control module 5); 4. Power supply problem: the power supply Unstable or interrupted supply; 5. Environmental interference: Environmental factors such as temperature, humidity, dust, etc. are beyond the normal operating range of the equipment; 6. Abnormal process parameters: Abnormalities that may occur during the adjustment of spray process parameters, such as spraying speed is too fast or too slow, spraying pressure is too high or too low, etc.; 7. Mechanical failure: The precision motor or transmission mechanism in each module fails, resulting in inaccurate or unstable scanning; 8. Data acquisition abnormality: The data acquisition card or processor in the data acquisition and processing module 4 has abnormalities when collecting and processing data; 9. User operation errors: Possible erroneous operations by operators when setting or adjusting the system; 10. Long-term stability issues: During long-term operation, if the system stability decreases, such as abnormal fluctuations in measurement data;

[0071] The design of the display and alarm module 6 needs to ensure that the operator can detect these abnormal situations in time and take corresponding measures to ensure the continuity of the production process and product quality.

[0072] In a second aspect, the present invention also provides a method for detecting the height of a lithium ion spraying diaphragm point online, the method comprising the following steps:

[0073] S1: Turn on the laser measurement module

[0074] Before the diaphragm is sprayed, the laser measurement module 2 is turned on; the diaphragm transmission mechanism is used to transmit the battery diaphragm base film. During the transmission process, the diaphragm spraying mechanism 11 is used to spray the coating slurry on the surface of the battery diaphragm base film. After the coating slurry is cured, a spraying diaphragm point is formed on the surface of the battery diaphragm base film;

[0075] S2: Start the scanning driver module

[0076] The battery diaphragm with the sprayed diaphragm point formed on the surface is continuously transmitted to the measurement area of ​​the laser measurement module 2, the scanning drive module 3 is turned on, the scanning drive module 3 drives the laser measurement module 2 to move, and the laser measurement module 2 measures the height of the sprayed diaphragm point on the surface of the battery diaphragm in the measurement area to obtain the real-time distance information of the sprayed diaphragm point;

[0077] S3: Data transmission to data acquisition and processing module

[0078] The laser measurement module 2 transmits the acquired real-time distance information to the data acquisition and processing module 4;

[0079] S4: the data acquisition and processing module 4 receives the real-time distance information transmitted from the laser measurement module 2, and compares the real-time distance information with a preset standard range;

[0080] Specifically, if the real-time distance information is within the preset standard range, it means that the diaphragm spraying module 1 is working normally, and there is no need to adjust the diaphragm spraying module 1, and the diaphragm spraying mechanism 11 continues to spray the battery diaphragm base film to be sprayed;

[0081] If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module 1 is working abnormally and generates abnormal information. The data acquisition and processing module 4 transmits the real-time distance information and the abnormal information to the real-time feedback control module 5. The real-time feedback control module 5 generates an adjustment instruction based on the real-time distance information and the abnormal information, and sends the adjustment instruction to the diaphragm spray module 1. The diaphragm spray module 1 adjusts the spraying parameters according to the adjustment instruction.

[0082] The following are specific examples.

[0083] Example 1

[0084] This embodiment provides a detection method for an online device for detecting the height of a lithium ion spraying diaphragm, which is performed using the online device for detecting the height of a lithium ion spraying diaphragm provided by the embodiment of the first aspect of the present invention. Specifically, the method comprises the following steps:

[0085] S1: Turn on the laser measurement module

[0086] Before the diaphragm is sprayed, the laser measurement module 2 is turned on, wherein the laser displacement sensor used by the laser measurement module has an accuracy of 0.5 microns (i.e., [X1] = 0.5 μm); the battery diaphragm base film is transported using a diaphragm transmission mechanism, and during the transmission process, a diaphragm spraying mechanism 11 is used to spray a coating slurry on the surface of the battery diaphragm base film, and the coating slurry is solidified to form a sprayed diaphragm point on the surface of the battery diaphragm base film;

[0087] S2: Start the scanning driver module

[0088] The battery diaphragm with the sprayed diaphragm points formed on the surface is continuously transmitted to the measurement area of ​​the laser measurement module 2, and the scanning drive module 3 is turned on. The scanning drive module 3 drives the laser measurement module 2 to move, wherein the scanning speed of the scanning drive module is 1000 points per second ([X2] = 1000 points / second), and the laser measurement module 2 measures the height of the sprayed diaphragm points on the surface of the battery diaphragm in the measurement area to obtain the real-time distance information of the sprayed diaphragm points;

[0089] S3: Data transmission to data acquisition and processing module

[0090] The laser measurement module 2 transmits the acquired real-time distance information to the data acquisition and processing module 4;

[0091] S4: The data acquisition and processing module 4 receives the real-time distance information transmitted from the laser measurement module 2, and compares the real-time distance information with the preset standard range, wherein the data processing frequency of the data acquisition and processing module is 1 MHz (i.e. [X3] = 1 MHz), and the preset standard range is 10 to 20 μm (i.e. [X4] = 10 μm, [X5] = 20 μm);

[0092] Specifically, if the real-time distance information is within the preset standard range, it means that the diaphragm spraying module 1 is working normally, and there is no need to adjust the diaphragm spraying module 1, and the diaphragm spraying mechanism 11 continues to spray the battery diaphragm base film to be sprayed;

[0093] If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module 1 is working abnormally and generates abnormal information. The data acquisition and processing module 4 transmits the real-time distance information and the abnormal information to the real-time feedback control module 5. The real-time feedback control module 5 generates an adjustment instruction based on the real-time distance information and the abnormal information, and sends the adjustment instruction to the diaphragm spray module 1. The diaphragm spray module 1 adjusts the spraying parameters according to the adjustment instruction until the real-time distance information is restored to the normal range of 10 to 20 μm.

[0094] Example 2

[0095] This embodiment provides a detection method for an online detection device of lithium ion spraying diaphragm point height, which is different from the embodiment 1 in that, in this embodiment, the accuracy of the laser measurement module is improved to 0.1 micron ([X6] = 0.1 μm) to achieve more precise measurement; the scanning speed of the scanning drive module is increased to 2000 points per second ([X7] = 2000 points / second); the other parameters are the same as those in the embodiment 1, that is, the data processing frequency of the data acquisition and processing module is kept at 1 MHz, and the preset standard range of 10 to 20 μm remains unchanged. The rest of the operation process is the same as that in the embodiment 1.

[0096] It can be seen from the actual measurement results of Example 1 and Example 2 that the device for online detection of lithium ion spraying diaphragm point height can realize accurate measurement and adjustment of lithium ion spraying diaphragm point height under different accuracies and scanning speeds, thereby illustrating that the device can effectively monitor and adjust the spraying quality of lithium ion battery diaphragms in real time, further demonstrating the flexibility of the device and its ability to adapt to different production needs.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A device for online detection of lithium ion spraying diaphragm point height, characterized in that: include: The diaphragm spraying module includes a diaphragm transmission mechanism, a diaphragm spraying mechanism and a battery diaphragm base film, wherein the diaphragm transmission mechanism is used to transmit the battery diaphragm base film, and the diaphragm spraying mechanism is used to spray the coating slurry on the surface of the battery diaphragm base film, and the coating slurry forms a spraying diaphragm point on the surface of the battery diaphragm base film after being cured; A laser measurement module is used to measure the distance between itself and the spraying membrane point on the surface of the battery membrane base film, and generate real-time distance information; Scanning drive module, the scanning drive module is used to drive the laser measurement module to move; A data acquisition and processing module, which is used to receive real-time distance information from the laser measurement module, and process and analyze the real-time distance information; Real-time feedback control module, the real-time feedback control module is connected with the data acquisition and processing module, The display and alarm module is connected to the laser measurement module, the data acquisition and processing module and the real-time feedback control module respectively.

2. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The diaphragm transmission mechanism is divided into a coating spraying area and a scanning measurement area. The diaphragm spraying mechanism is arranged in the coating spraying area. The laser measurement module and the scanning drive module are both located in the scanning measurement area.

3. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The diaphragm spraying mechanism is provided with a flow meter and a throttle valve for adjusting the spraying speed and the spraying pressure during the spraying of the coating slurry.

4. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The laser measurement module is a high-precision laser displacement sensor.

5. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The process of processing and analyzing the real-time distance information by the data acquisition and processing module is as follows: the data acquisition and processing module receives the real-time distance information from the laser measurement module, and compares the real-time distance information with a preset standard range; The process of comparing the real-time distance information with the preset standard range is as follows: If the real-time distance information is within the preset standard range, it means that the diaphragm spray module is working properly; If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module is working abnormally. The data acquisition and processing module generates abnormal information and transmits the real-time distance information and the abnormal information to the real-time feedback control module. The real-time feedback control module issues an adjustment instruction based on the real-time distance information and the abnormal information to adjust the spraying parameters of the diaphragm spray mechanism in the diaphragm spray module.

6. The device for online detection of lithium ion spraying diaphragm point height according to claim 5, characterized in that: The spraying parameters include the coating slurry nozzle speed and the coating slurry spraying pressure.

7. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The display and alarm module is used to receive the real-time distance information from the laser measurement module and display it.

8. The device for online detection of lithium ion spraying diaphragm point height according to claim 1, characterized in that: The display and alarm module is also used to issue alarm information in abnormal situations.

9. A detection method for an online device for detecting the height of a lithium ion spraying diaphragm according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: using a diaphragm transmission mechanism to transmit the battery diaphragm base film, during the transmission process, using a diaphragm spraying mechanism to spray a coating slurry on the surface of the battery diaphragm base film, and after the coating slurry is cured, a spraying diaphragm point is formed on the surface of the battery diaphragm base film; S2: The battery diaphragm with the sprayed diaphragm point formed on the surface continues to be transmitted to the measurement area of ​​the laser measurement module. The laser measurement module measures the height of the sprayed diaphragm point on the surface of the battery diaphragm, obtains the real-time distance information of the sprayed diaphragm point, and transmits the real-time distance information to the data acquisition and processing module; S3: The data acquisition and processing module receives the real-time distance information transmitted from the laser measurement module, and compares the real-time distance information with the preset standard range, and issues adjustment instructions according to the comparison result to adjust the spraying parameters of the diaphragm spraying module.

10. The detection method of the device for online detection of lithium ion spraying diaphragm point height according to claim 9, characterized in that: In step S3, the specific process of comparing the real-time distance information with the preset standard range is as follows: If the real-time distance information is within the preset standard range, it means that the diaphragm spraying module is working normally, and the data acquisition and processing module transmits the real-time distance information to the real-time feedback control module, and the real-time feedback control module monitors the normal operation of the diaphragm spraying module; If the real-time distance information is not within the preset standard range, it means that the diaphragm spray module is working abnormally. The data acquisition and processing module generates abnormal information and transmits the real-time distance information and the abnormal information to the real-time feedback control module. The real-time feedback control module issues an adjustment instruction based on the real-time distance information and the abnormal information to adjust the spraying parameters of the diaphragm spray mechanism in the diaphragm spray module.

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