Pole piece drying system and detection system thereof

Abstract

The application discloses an electrode piece drying system and a detection system thereof. The detection system comprises a condenser, an air suction device which is communicated with an oven drying cavity and an air inlet of a first flow channel of the condenser, a liquid measuring device which is communicated with a liquid outlet of the first flow channel of the condenser and is used for collecting the liquid condensed from the airflow and measuring the total amount of the liquid collected within a preset time length, and a data processing device which is signal-connected with the liquid measuring device and can process the measurement result of the liquid measuring device. Through the detection system, the dry-wet state of the electrode piece which is in the baking process in the oven can be monitored in real time before the electrode piece is discharged from the oven.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a detection system for detecting the drying state of electrode sheets, and an electrode drying system equipped with the detection system. Background Technology

[0002] With the booming development of the new energy industry, the new energy market is constantly placing higher demands on the energy density, cycle life, and safety performance of lithium-ion power batteries. Therefore, it is necessary to pay attention to quality control in the lithium-ion battery production process and strive to improve product quality and consistency. In the process of lithium-ion battery process development and quality control, 70% of the cell quality is related to the quality of the electrode sheet. Among them, the electrode sheet coating and drying process is the key link in the preparation of high-quality electrode sheets. Various coating unevenness and drying defects that may occur during the electrode sheet coating and drying process are not conducive to the preparation of electrode sheets with uniform thickness and areal density, and seriously affect the electrode sheet yield.

[0003] The current electrode coating method involves uniformly applying a prepared slurry onto the positive and negative current collectors, and then baking it in an oven to remove the solvent from the coating. After coating, the electrode needs to be sampled and tested. Only after the sample passes the test can it proceed to the next process to prepare the desired electrode.

[0004] However, during the coating and drying process, when the wet coating undergoes solvent evaporation in the oven, there is a lack of effective online monitoring methods. It is impossible to grasp the dry and wet state of the electrode in real time. The quality can only be judged by sampling after the electrode comes out of the oven. If the drying temperature is too low during coating, the electrode may not be fully dried. If the drying temperature is too high, the solvent inside the coating may evaporate too quickly, resulting in problems such as cracking and peeling on the coating surface. Utility Model Content

[0005] In view of this, the purpose of this application is to provide an electrode drying system and its detection system, which can monitor the dryness and wetness of the electrode in the drying oven in real time before the electrode leaves the oven.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A detection system, comprising:

[0008] The condenser is provided with a first flow channel for conveying airflow from the baking chamber inside the oven, and a second flow channel adjacent to the first flow channel for cooling it.

[0009] The suction device is provided with a suction port and a discharge port; the suction port is used to communicate with the baking cavity; the discharge port is connected to the air inlet of the first flow channel and is used to transport the airflow from the baking cavity to the first flow channel;

[0010] A liquid measuring device is connected to the liquid outlet of the first flow channel in the condenser, and is used to collect the liquid condensed in the gas flow and measure the total amount of liquid collected within a preset time period.

[0011] A data processing device, connected to the liquid measuring device, is capable of processing the measurement results of the liquid measuring device. The processing includes: displaying the measurement results, and / or comparing the measurement results with preset data and displaying the comparison results, and / or generating feedback control commands based on the comparison results to the oven controller of the oven as a basis for adjusting the temperature and air frequency.

[0012] Optionally, in the above detection system, the liquid measuring device includes a container for collecting liquid condensed in the gas flow, and a liquid level sensor for measuring the liquid level in the container; the conveying container is connected to the liquid outlet, and the liquid level sensor is signal-connected to the data processing device.

[0013] Optionally, in the above detection system, the data processing device includes a data display, which is signal-connected to the liquid measuring device and is capable of displaying the measurement results and / or the comparison results.

[0014] Optionally, in the above-described detection system, the data display is provided with multiple display units, each of which is used to display the measurement results of the multiple ovens.

[0015] Optionally, the above detection system further includes an air extraction device, which is provided with an air extraction port; the air extraction port is connected to the air outlet of the first flow channel.

[0016] Optionally, the above detection system also includes a waste liquid collector, wherein:

[0017] The bottom of the liquid measuring device is connected to the waste liquid collector, and the connection between the liquid measuring device and the waste liquid collector is controlled by a first control valve.

[0018] And / or, the waste liquid collector and the liquid measuring device are detachably connected.

[0019] Optionally, in the above detection system, multiple suction devices are provided, and each of the multiple suction devices is provided with a suction port for communicating with the baking chambers of the multiple ovens respectively.

[0020] Optionally, in the above detection system, each of the air intakes is provided with an air outlet, wherein:

[0021] The plurality of air outlets are connected to the same air inlet of the same condenser; or, the plurality of air outlets are respectively connected to the air inlets of the plurality of first flow channels in the same condenser; or, the plurality of air outlets are respectively connected to the air inlets of the plurality of condensers.

[0022] Optionally, in the above detection system, each of the air outlets is connected to the air inlet via a delivery pipeline; each delivery pipeline is provided with a second control valve capable of controlling the opening and closing of the pipeline; and / or, each air intake is provided with a third control valve capable of controlling the opening and closing of the air intake; and / or, each air outlet is provided with a fourth control valve capable of controlling the opening and closing of the air outlet.

[0023] Optionally, the above detection system also includes a controller for controlling the detection system to start cyclically at preset time intervals.

[0024] An electrode drying system includes an oven and the detection system described above.

[0025] Optionally, in the above-mentioned electrode drying system, the air inlet of the suction device in the detection system is located at the top of the oven, between adjacent return air inlets, or inside the return air inlets.

[0026] Optionally, in the above-described electrode drying system, the distance between the air intake and the electrode is adjustable in a direction perpendicular to the electrode surface inside the oven.

[0027] Optionally, in the above-mentioned electrode drying system, the opening length of the air inlet is adjustable in the electrode width direction located inside the drying oven.

[0028] Optionally, in the above-mentioned electrode drying system, multiple drying ovens are arranged in parallel along the electrode conveying direction, and the baking chamber inside each drying oven is connected to the air intake of the air suction device in the detection system.

[0029] Optionally, in the above-described electrode drying system, each of the ovens is connected to one or more of the air inlets.

[0030] As can be seen from the above technical solution, when the detection system provided in this application is connected to the oven, the solvent in the coating on the electrode surface during the baking process in the oven evaporates into a gaseous state at high temperature and is drawn into the suction device along with the surrounding airflow, and then enters the condenser. Under the heat exchange effect of the condenser, the temperature of the gaseous solvent in the airflow drops sharply and turns into liquid, flowing into the liquid measuring device. The liquid measuring device can collect, quantify and measure the solvent evaporated during the electrode baking process within a preset time, thereby detecting the liquid content from the electrode coating in the airflow, thus completing one sampling test. Then, the data processing device displays the relevant measurement results and / or the above comparison results, so that the staff can observe and judge in time whether the current drying speed and dry-wet state of the electrode are appropriate. Moreover, the data processing device can also use the measurement results and / or comparison results as data support to provide a basis for adjusting the process parameters such as temperature, wind speed, and wind frequency in the oven during the coating process. After the temperature, wind speed, and wind frequency are adjusted to the appropriate level, the detection system is restarted immediately or after a preset time interval to resample and test until the measurement results of the liquid measuring device are within the preset data range. Throughout the entire baking process of the electrode sheets in the oven, the above-mentioned detection process is repeated at regular intervals to achieve online monitoring of the electrode sheet condition. It is evident that this detection system enables real-time monitoring and timely adjustment of the dryness and wetness of the electrode sheets during the baking process in the oven. It achieves closed-loop control between adjusting process parameters such as oven baking temperature, wind speed, and wind frequency, and monitoring the dryness and wetness of the electrode sheets. This avoids problems such as insufficient drying of the electrode sheets due to excessively low drying temperatures during coating, and also prevents problems such as cracking and peeling of the coating surface due to excessively high drying temperatures and rapid evaporation of solvents within the coating. This ensures that the dryness and wetness of the electrode sheets exiting the oven meet the requirements, guaranteeing the quality of the electrode coating.

[0031] The electrode drying system provided in this application is equipped with the aforementioned detection system, thus enabling it to achieve the above-mentioned technical effects, which will not be elaborated further here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the connection structure of a detection system in an electrode drying system, as provided in the first specific embodiment of this application.

[0034] Figure 2This is a schematic diagram showing the arrangement of the air inlet of an air suction device and the return air inlet of an oven, provided in the first specific embodiment of this application.

[0035] Figure 3 This is a schematic diagram of a condenser provided in the first specific embodiment of this application.

[0036] Figure 4 This is a schematic diagram of the connection structure of a detection system in an electrode drying system, as provided in the second specific embodiment of this application.

[0037] Figure 5 This is a schematic diagram of the connection structure of a detection system in an electrode drying system, as provided in the third specific embodiment of this application.

[0038] in:

[0039] 1-Oven, 2-Condenser, 3-Evacuation device, 4-Liquid level display device

[0040] 5-Data display, 51-Display unit, 6-Liquid collection device,

[0041] 7-Suction device, 8-Second control valve, 9-Second control valve

[0042] 11 - Return air inlet, 71 - Air intake inlet

[0043] 21-Media inlet, 22-Media outlet, 23-Air inlet, 24-Liquid outlet, 25-Air extraction port. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] First Specific Embodiment

[0046] The first specific embodiment of this application provides a detection system that can be applied to monitor the dry and wet state of electrodes in an oven during the electrode coating process. Please refer to [link to relevant documentation]. Figure 1The detection system mainly includes a condenser 2, a suction device 7, a liquid measuring device 4, and a data processing device 5. The condenser 2 is used to cool the airflow from the baking cavity inside the oven 1. The suction device 7 is equipped with a suction port 71 and an air outlet. The suction port 71 is connected to the baking cavity inside the oven 1, and the air outlet is connected to the air inlet 23 of the first flow channel in the condenser 2, used to transport the airflow from the baking cavity inside the oven 1 to the condenser 2 for cooling. The liquid measuring device 4 is connected to the liquid outlet 24 of the first flow channel in the condenser 2, used to collect the liquid condensed from the airflow and measure the total amount of liquid collected within a preset time. The data processing device 5 is signal-connected to the liquid measuring device 4 and can process the measurement results of the liquid measuring device 4. Specifically, when the data processing device 5 processes the measurement results of the liquid measuring device 4, it includes: displaying the measurement results of the liquid measuring device 4, and / or comparing the measurement results with preset data (target value under ideal conditions) and displaying the comparison results to remind the operator whether the current temperature and air frequency of the oven are appropriate, and / or generating feedback control commands based on the above comparison results and sending them to the oven controller of the oven 1 as the basis for adjusting the temperature and air frequency to achieve automatic adjustment, and finally realizing closed-loop control of baking temperature, air frequency adjustment and electrode dryness and wetness status.

[0047] When the detection system provided in the first specific embodiment of this application is connected to the oven 1, the solvent in the coating on the electrode surface during the baking process in the oven 1 evaporates into a gaseous state at high temperature and is drawn into the suction device 7 along with the surrounding airflow, and then enters the condenser 2. Under the heat exchange effect of the condenser 2, the temperature of the gaseous solvent in the airflow drops sharply and it turns into a liquid, which flows into the liquid measuring device 4. The liquid measuring device 4 can collect, quantify and measure the solvent evaporated during the electrode baking process within a preset time, thereby detecting the liquid content from the electrode coating in the airflow, thus completing one sampling test. Then, the data processing device 5 displays the relevant measurement results and / or the above comparison results, so that the staff can observe and judge in time whether the current drying speed and dry-wet state of the electrode are appropriate. Furthermore, the data processing device 5 can use the measurement results and / or comparison results as data support to adjust process parameters such as temperature, wind speed, and wind frequency within the oven 1 during the coating process. Once the temperature, wind speed, and wind frequency are adjusted to the appropriate levels, the detection system is restarted immediately or after a preset interval to resample and test, until the measurement results from the liquid measuring device 4 are within the preset data range. Throughout the entire process of baking the electrode in the oven, the above detection process is repeated at regular intervals, thereby achieving online monitoring of the electrode's condition. It is evident that this detection system enables real-time monitoring and timely adjustment of the dry and wet state of the electrode during the baking process within the oven 1. It achieves closed-loop control between adjusting the baking temperature, wind speed, and wind frequency of the oven 1 and detecting the dry and wet state of the electrode. This avoids the problem of insufficient drying of the electrode due to excessively low drying temperature during coating, and also prevents problems such as cracking and peeling of the coating surface due to excessively high drying temperature and rapid evaporation of the solvent inside the coating. This ensures that the dry and wet state of the electrode exiting the oven meets the requirements, guaranteeing the quality of the electrode coating.

[0048] In some embodiments, the liquid measuring device 4 includes a container for collecting liquid condensed in the airflow and a liquid level sensor for measuring the liquid level in the container. The container is connected to the outlet 24 of the condenser 2, allowing it to collect and measure the liquid level in the first flow channel of the condenser 2. The liquid level sensor is generally connected to the data processing device 5 via a data cable, transmitting the measurement results related to the liquid level collected in the container to the data processing device 5, thereby quantifying the vapor content baked in the electrode as liquid level data for processing by the data processing device 5. The container of the liquid measuring device 4 is equipped with a liquid level display scale for easy observation by operators. However, this is not a limitation; the liquid measuring device 4 can also use other instruments that can quantify the vapor content after electrode baking, such as a weighing scale, flow meter, or color display, as long as the total amount or change of condensed liquid can be measured to facilitate calculation of the current drying speed and / or wet / dry state of the electrode in the oven 1. This application does not impose specific limitations on this.

[0049] In some embodiments, the data processing device 5 includes at least a data display connected to the liquid measuring device 4, capable of displaying the measurement results of the liquid measuring device 4 and / or the aforementioned comparison results, so that operators can promptly observe and judge whether the current drying speed and wet / dry state of the electrode are appropriate. Furthermore, the data processing device 5 can compare the measurement results of the liquid measuring device 4 with preset data (target values ​​under ideal conditions) of the electrode's wet / dry state, thereby determining whether the current drying speed and wet / dry state of the electrode in this section of the oven 1 are reasonable. Figure 1 As shown, in specific implementations, the electrode coating is typically dried using multiple ovens 1, thus requiring separate testing and display of the results from each oven 1. Therefore, in some embodiments, the data display is equipped with multiple display units 51, enabling the display of measurement results from multiple ovens 1 separately. However, this is not a limitation. In other embodiments, the data display may have only one display unit 51, which can simultaneously display the measurement results from multiple ovens 1, or cycle through the display of measurement results from each oven 1, or provide a button for the operator to select and display the measurement results from any oven 1.

[0050] In some embodiments, the condenser 2 has a first flow channel inside for conveying the airflow to be cooled, as described above. Furthermore, the condenser 2 also has a second flow channel inside for conveying the heat exchange medium. See also... Figure 3The first flow channel has an inlet 23 at one end for inputting the airflow to be cooled, and an outlet 25 at the other end for connecting to the extraction device 3. The bottom of the first flow channel also has an outlet 24 for discharging condensate. The second flow channel has a medium inlet 21 and a medium outlet 22 at its two ends. The medium inlet 21 is used to input a lower-temperature heat exchange medium into the second flow channel, and the medium outlet 22 is used to output the relatively higher-temperature heat exchange medium from the second flow channel to the external circulation system. The external circulation system then cools the heat exchange medium before it re-enters the second flow channel of the condenser 2 for reuse. The first and second flow channels are generally arranged adjacent to each other to allow heat exchange between the lower-temperature heat exchange medium in the second flow channel and the higher-temperature airflow in the first flow channel. When the airflow from the baking chamber inside the oven 1 in the first flow channel is cooled by the circulating heat exchange medium in the second flow channel, liquid water precipitates from the cooled airflow. The liquid water is then discharged from the outlet 24 of the condenser 2 and collected in the liquid measuring device 4.

[0051] In some embodiments, the suction device 3 provides suction to the air extraction device 7. Specifically, the suction device 3 is provided with an air extraction port, which is connected to the air outlet 25 of the first flow channel in the condenser 2, thereby driving the air extraction device 7 to draw the airflow in the oven 1 into the first flow channel of the condenser 2 for cooling. However, it is not limited to this; in other embodiments, the suction device 3 can also be installed in the delivery pipeline. This application does not specifically limit the installation position of the suction device 3, as long as it can deliver the airflow in the oven 1 to the condenser 2 for cooling.

[0052] In some embodiments, the liquid in the liquid measuring device 4 is collected by a waste liquid collector 6. Specifically, the bottom of the liquid measuring device 4 is connected to the waste liquid collector 6, and a first control valve 9 is provided in the connecting pipe between the liquid measuring device 4 and the waste liquid collector 6. Normally, the first control valve 9 is in a closed state. When the liquid in the liquid measuring device 4 has been measured, or when there is too much liquid in the liquid measuring device 4, the first control valve 9 controls the connecting pipe to open, allowing the liquid collected in the liquid measuring device 4 to be discharged into the waste liquid collector 6, avoiding environmental pollution caused by indiscriminate discharge of waste liquid. For example, after the measurement result from the liquid measuring device 4 is transmitted to the data processing device 5, it indicates that the current detection task is completed. At this time, the first control valve 9 can be controlled to open, emptying the liquid in the liquid measuring device 4 to facilitate the next detection task. Moreover, in some embodiments, the waste liquid collector 6 and the liquid measuring device 4 are detachably connected. For example, a connecting pipe is provided between the waste liquid collector 6 and the liquid measuring device 4, and the waste liquid collector 6 is detachably connected to the connecting pipe, and / or the liquid measuring device 4 is detachably connected to the connecting pipe. Thus, when the waste liquid collector 6 is full of waste liquid, another waste liquid collector 6 can be used to continue collecting waste liquid. However, this is not a limitation; in other embodiments, the waste liquid in the waste liquid collector 6 can also be discharged and treated in other ways.

[0053] In actual production, multiple ovens 1 are typically connected in series along the electrode transport direction to form an oven system. If the dryness or wetness of the electrode output from the last oven 1 does not meet the requirements, existing methods cannot determine which stage of the oven baking process is abnormal. The only way to adjust the dryness or wetness of the electrode is to adjust the temperature and air frequency parameters of the entire oven system. This adjustment has low accuracy, high trial-and-error costs, and low efficiency, which can easily lead to a large waste of materials and time.

[0054] Therefore, as Figure 1As shown in the figure, the detection system provided in the first specific embodiment of this application has multiple suction devices 7 connected in parallel (only two are shown as examples in the figure). Each suction device 7 is provided with a suction port 71, which is used to communicate with the baking chambers of multiple ovens 1 respectively. Specifically, the air outlet of each suction device 7 is connected to the air inlet 23 of the condenser 2 through a conveying pipeline. Each conveying pipeline is provided with a second control valve 8 that can control the opening and closing of the pipeline. When it is necessary to sample and test a certain oven 1, the second control valve 8 corresponding to that oven 1 is opened so that the airflow in the oven 1 can be sampled and tested by the detection system, and the drying speed and dry and wet state of the electrode in the oven 1 can be measured. This data is then used to support the feedback to the oven 1 for corresponding adjustments. In specific implementation, the opening and closing of the second control valve 8 can be controlled by a controller. For example, when the extraction device 3 starts to extract steam, the second control valve 8 is opened, and when the extraction device 3 stops, the second control valve 8 is closed. However, this is not the only option. In other embodiments, a third control valve capable of controlling the opening and closing of the air intake 71 may be provided in each air intake 71 of the air intake device 7, and each third control valve may be controlled to open and close by a controller; and / or, a fourth control valve capable of controlling the opening and closing of the air outlet may be provided in each air outlet of the air intake device 7, and each fourth control valve may be controlled to open and close by a controller.

[0055] In some embodiments, in order to enable sampling and testing of multiple ovens 1 separately, therefore, as Figure 1 As shown, the air outlet of the suction device 7 connected to each oven 1 is connected to the air inlet 23 of multiple condensers 2, and the liquid outlet 24 of each condenser 2 is connected to a liquid measuring device 4. Multiple liquid measuring devices 4 are connected to the same data processing device 5 via data cables. Each condenser 2 corresponds one-to-one with a single oven 1, and each condenser 2 can be independently controlled to open and close. This allows the detection system to monitor each oven 1 individually and provide effective data support for adjusting process parameters such as temperature, air velocity, and air frequency for each oven 1 section.

[0056] In some embodiments, the sampling and detection process of the detection system provided in this application can be executed once at regular intervals according to a program setting, that is, the detection is cyclically started once at a preset time interval. This working state can be specifically set by the controller. In this working state, the vacuum device 3, condenser 2, liquid measuring device 4, and data processing device 5 stop after a first preset time of continuous operation, and start again after a second preset time of stoppage. Specifically, the controller can preset and adjust the stoppage time and continuous operation time of the vacuum device 3, condenser 2, liquid measuring device 4, and data processing device 5 in the above working state. Alternatively, in other embodiments, the sampling and detection process of this detection system can also be executed continuously and cyclically according to a program setting, thereby achieving the purpose of real-time monitoring of the dry and wet states of the oven 1 and the electrode sheets. Specifically, the specific working mode can be selected based on the choice of the liquid measuring device 4 and actual needs.

[0057] It should be noted that the electrode plates mentioned in this application generally refer to positive and / or negative electrode plates used in lithium batteries.

[0058] The detection system provided in this application has high versatility and can be applied to different coating equipment. For example, the first specific embodiment of this application also provides an electrode drying system, which includes multiple drying ovens 1 and the detection system described above.

[0059] In practical implementation, this electrode drying system has multiple drying ovens 1 arranged in parallel along the electrode conveying direction. The baking chamber inside each drying oven 1 is connected to the air intake 71 of the suction device 7 in the detection system. Thus, the detection system can effectively identify the dry and wet state of the electrode in each drying oven 1 during the coating process, providing effective data support for adjusting process parameters such as temperature, wind speed, and wind frequency in each drying oven 1 during the coating process, achieving closed-loop control of coating temperature, wind frequency adjustment, and electrode dryness / wetness state.

[0060] In some embodiments, such as Figure 1 and Figure 2 As shown, the top of the baking cavity inside the oven 1 is provided with two or more return air vents 11. The air intake vent 71 of the suction device 7 in the detection system is located on the top of the oven 1, between adjacent return air vents 11, or inside the return air vent 11. However, it is not limited to this. In other embodiments, the air intake vent 71 of the suction device 7 can also be located at other positions in the oven 1, or multiple air intake vents 71 can be provided at different positions in each oven 1, that is, each oven 1 can be connected to one or more air intake vents 71 to facilitate sampling and detection of airflow at specific or different positions inside the oven 1.

[0061] In some embodiments, the suction device 7 is located inside the oven 1 and close to the surface of the electrode. Furthermore, the distance between the suction port 71 and the electrode can be adjusted as needed in a direction perpendicular to the surface of the electrode inside the oven 1.

[0062] In some embodiments, the length of the suction port 71 of the suction device 7 in the electrode width direction located in the oven 1 can be adjusted according to the electrode width (or coating width) in the oven 1, that is, the length of the suction device 7 is adjustable.

[0063] Second specific embodiment

[0064] Please see Figure 4 The difference between the detection system provided in the second embodiment of this application and the first embodiment described above is that the air outlets of the multiple suction devices 7 connected to the multiple ovens 1 are respectively connected to the air inlets 23 of the multiple first flow channels in the same condenser 2. Thus, when sampling and testing any oven 1, the sampling airflow delivered by any suction device 7 can be cooled by a condenser 2.

[0065] In this condenser 2, the liquid outlets 24 of the multiple first flow channels are each connected to a liquid measuring device 4, and the multiple liquid measuring devices 4 are each connected to the same data processing device 5 via data cables. Each of the multiple first flow channels and their liquid outlets 24 corresponds one-to-one with a multiple oven 1, and the air inlets 23 of the multiple suction devices 7 can be independently controlled to open and close; or, the delivery pipelines connected to the multiple air inlets 23 can be independently controlled to open and close; or, the multiple suction ports 71 or air outlets can be independently controlled to open and close. Therefore, when sampling and testing is required for one or more ovens 1, the suction device 7 connected to that oven 1, along with its corresponding delivery pipeline, air inlet 23, and air outlet, are opened. The suction devices 7, their corresponding delivery pipelines, air inlets 23, and air outlets corresponding to other ovens 1 that do not require testing remain closed. This allows multiple ovens 1 to be tested independently. The detection system effectively identifies the dry / wet state of the electrode sheet in each oven 1 during the coating process, providing effective data support for adjusting process parameters such as temperature, air velocity, and air frequency in each oven 1. This achieves closed-loop control of coating temperature, air frequency adjustment, and electrode dry / wet state.

[0066] Third specific embodiment

[0067] Please see Figure 5The difference between the detection system provided in the third specific embodiment of this application and the first specific embodiment is only that: the air outlets of the multiple suction devices 7 connected to the multiple ovens 1 are connected to the same air inlet 23 in the same condenser 2, and multiple ovens 1 can be detected sequentially through a single condenser 2. When sampling and testing of a particular oven 1 is required, it is only necessary to open the suction device 7 connected to that oven 1 and pass it through the condenser, liquid measuring device 4, and data processing device 5. After completing this test, the liquid measured in the liquid measuring device 4 can be discharged to the waste liquid collection device 6, and then the next round of sampling and testing can be performed. Therefore, this detection system can independently detect multiple ovens 1, effectively identify the dry and wet state of the electrode sheet in each oven 1 during the coating process, and provide effective data support for adjusting process parameters such as temperature, wind speed, and wind frequency in each oven 1 during the coating process, realizing closed-loop control of coating temperature, wind frequency adjustment, and electrode sheet dry and wet state.

[0068] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0070] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection system, characterized in that, include: The condenser is provided with a first flow channel for conveying airflow from the baking chamber inside the oven, and a second flow channel adjacent to the first flow channel for cooling it. The suction device is provided with a suction port and a discharge port; the suction port is used to communicate with the baking cavity; the discharge port is connected to the air inlet of the first flow channel and is used to transport the airflow from the baking cavity to the first flow channel; A liquid measuring device is connected to the liquid outlet of the first flow channel in the condenser, and is used to collect the liquid condensed in the gas flow and measure the total amount of liquid collected within a preset time period. A data processing device, connected to the liquid measuring device, is capable of processing the measurement results of the liquid measuring device. The processing includes: displaying the measurement results, and / or comparing the measurement results with preset data and displaying the comparison results, and / or generating feedback control commands based on the comparison results to the oven controller of the oven as a basis for adjusting the temperature and air frequency.

2. The detection system according to claim 1, characterized in that, The liquid measuring device includes a container for collecting liquid condensed in the gas flow, and a liquid level sensor for measuring the liquid level in the container; the conveying container is connected to the liquid outlet, and the liquid level sensor is signal-connected to the data processing device. And / or, the data processing device includes a data display, which is signal-connected to the liquid measuring device and is capable of displaying the measurement results and / or the comparison results.

3. The detection system according to claim 2, characterized in that, The data display is provided with multiple display units, each of which is used to display the measurement results of the multiple ovens.

4. The detection system according to claim 1, characterized in that, It also includes an air extraction device, which is provided with an air extraction port; The air extraction port is connected to the air outlet of the first flow channel.

5. The detection system according to claim 1, characterized in that, It also includes a waste liquid collector, wherein: The bottom of the liquid measuring device is connected to the waste liquid collector, and the connection between the liquid measuring device and the waste liquid collector is controlled by a first control valve. And / or, the waste liquid collector and the liquid measuring device are detachably connected.

6. The detection system according to claim 1, characterized in that, Multiple suction devices are provided, and each suction device is provided with a suction port for communicating with the baking chambers of the multiple ovens.

7. The detection system according to claim 6, characterized in that, Each of the aforementioned air intakes is provided with an air outlet, wherein: The plurality of air outlets are connected to the same air inlet of the same condenser; or, the plurality of air outlets are respectively connected to the air inlets of the plurality of first flow channels in the same condenser; or, the plurality of air outlets are respectively connected to the air inlets of the plurality of condensers. And / or, Each of the air outlets is connected to the air inlet via a delivery pipeline; each delivery pipeline is equipped with a second control valve capable of controlling the opening and closing of the pipeline; and / or, each air intake is equipped with a third control valve capable of controlling the opening and closing of the air intake; and / or, each air outlet is equipped with a fourth control valve capable of controlling the opening and closing of the air outlet.

8. The detection system according to any one of claims 1 to 7, characterized in that, It also includes a controller for controlling the detection system to start cyclically at preset time intervals.

9. An electrode drying system, comprising an oven, characterized in that, It also includes the detection system according to any one of claims 1 to 8.

10. The electrode drying system according to claim 9, characterized in that, The air intake of the air suction device in the detection system is located at the top of the oven, between adjacent return air intakes, or inside the return air intakes. And / or, the distance between the air intake and the electrode is adjustable in a direction perpendicular to the electrode surface inside the oven; And / or, the opening length of the air inlet is adjustable in the direction of the electrode width within the oven; And / or, along the electrode conveying direction, multiple ovens are arranged in parallel, and the baking chamber inside each oven is connected to the air intake of the air suction device in the detection system; And / or, each of the ovens is connected to one or more of the air inlets.

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