Automatic detection device for copper content in lithium ion battery negative plate

Abstract

The invention provides an automatic detection device for the copper content in a lithium ion battery negative plate. The device comprises a shredding module of the negative plate, a movable clamping jaw module, an ultrasonic cleaning module, a hot blow-drying module, a weighing module and a man-machine interaction module. Parameters are set through the man-machine interaction module, and an automatic process is started. And the negative plate is shredded into chips by the shredding module, and the chips fall into a screen of the movable clamping jaw module and then move to the weighing module M1. And then the chippings are fed into the ultrasonic cleaning module to be cleaned, and the copper film chippings are left on the screen after impurities are removed. And the screen is moved to the hot blow-drying module to remove moisture, and then returns to the weighing module to weigh M2. And after two times of weighing, the copper content of the negative plate is calculated, and the result is displayed by the man-machine interaction module. According to the device, automation of sample feeding and result outputting is realized, manual operation is reduced, the error rate is reduced, and the reliability of a detection result is ensured. The whole process is efficient and accurate, and the working efficiency and the detection quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy material detection, and in particular to an automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery. Background Art

[0002] The content test of positive and negative electrode materials is an important detection work in the battery industry. Positive electrode materials and negative electrode materials are two key parts of the battery, and their content directly affects the performance and life of the battery. Therefore, it is very necessary to accurately test the content of positive and negative electrode materials. There are mainly the following methods for testing the copper content of negative electrode materials: chemical analysis, spectral analysis, electrochemical testing, physical testing, etc. These methods are of great significance for the control and optimization of the amount of copper powder in the production process of lithium batteries, which can improve product safety, extend battery life and ensure product quality. Among them, chemical analysis is one of the most commonly used methods. By chemically reacting the positive and negative electrode materials, the content of the positive and negative electrode materials can be inferred. This method has high accuracy and strong reliability, but requires professional chemical laboratories and equipment. Spectral analysis and electrochemical testing are mainly used in the research and development and production of high-end battery products. Spectral analysis analyzes the spectral characteristics of positive and negative electrode materials to infer their content. Electrochemical testing calculates their content by testing the electrochemical properties of positive and negative electrode materials. Physical testing is another commonly used method. By measuring the density, weight and other physical parameters of the positive and negative electrode materials, their content can be calculated. This method is relatively simple, but its accuracy is slightly lower than that of chemical analysis.

[0003] Patent CN201410244423.8 discloses a method for recovering graphite and copper foil from the negative electrode sheet of scrapped lithium-ion batteries, the steps of which are: discharging the scrapped lithium-ion batteries, disassembling them, and then placing the negative electrode sheet in a container containing a mixed solution of water and ethanol, stirring for a certain period of time, and then screening, washing the sieve with water, and obtaining copper foil after natural drying; heating the sieve to 70-90°C, and then filtering, and keeping the temperature of the solution before filtration at 70-90°C during the filtration process. After the filtration is completed, the filtrate is washed with water, and graphite is obtained after natural drying. Compared with the prior art, the present invention has the advantages of easy operation, low requirements for separation equipment, high efficiency and low cost of graphite and copper foil separation, and no secondary pollution during the separation process. Patent 201911290300 discloses a method for recovering graphite sheets and metals from the negative electrode sheets of waste lithium-ion batteries. The negative electrode sheet of the waste lithium-ion battery is wound on an insulating plate and connected to the positive electrode of an external power source, the conductive substrate is connected to the negative electrode of the external power source, the electrolyte is a copper salt solution, and electrolysis is performed to obtain a lithium-containing solution; the inert electrode is connected to the positive electrode of the external power source, the homemade electrode is connected to the negative electrode of the external power source, the electrolyte is a lithium-containing solution, and the lithium ion-embedded homemade electrode is obtained by power-on electrolysis; the lithium ion-embedded homemade electrode is connected to the positive electrode of the external power source, the inert electrode is connected to the negative electrode of the external power source, the electrolyte is a lithium hydroxide solution, and electrolysis is performed, metallic lithium enters the solution, and the solution is evaporated to obtain lithium hydroxide solid. The lithium hydroxide obtained by the present invention has high purity and high recovery rate of metallic lithium, and metallic copper and graphite sheets are also recovered. Patent CN202011482463.8 provides a method for recycling graphite negative electrode sheets and regenerating negative electrode materials, which relates to the field of battery negative sheet recycling. This method of recycling graphite negative electrode sheets to regenerate negative electrode materials, pre-crushing the graphite negative electrode sheets for toner treatment, then using a cyclone separator for impurity removal, removing the copper mixed in the graphite, and then sieving the mixed materials to further remove the copper and improve the consistency of the materials, and finally the materials are passed through a magnetic separator to remove the magnetic substances. The process of the present invention is simple, does not require the heat treatment process of the wet process, and has low cost. At the same time, the processed materials of the pulverizer are sent to the cyclone separator by pipeline air delivery, which can greatly reduce dust pollution. Patent CN202211252995.1 proposes a method for separating and recovering negative electrode sheets of lithium-ion batteries, including: adding the negative electrode sheets of lithium-ion batteries to water, ultrasonically vibrating the carbon negative electrode material to peel off the copper foil current collector, and obtaining a suspension of copper foil and carbon-containing negative electrode material; after the suspension of carbon-containing negative electrode material is separated into solid and liquid, it is heated and baked to obtain a carbon negative electrode material. The present invention provides a method for separating and recycling negative electrode sheets of lithium ion batteries. The method can not only effectively separate and recycle copper foil and carbon negative electrode materials, but also has the advantages of high efficiency, environmental protection, low cost and simple process.

[0004] The physical weight method is to calculate the copper content by weighing the mass difference between the sample and the product, and is usually used to quickly detect the copper content. However, the current method is mainly operated by experimenters, lacks automated operating equipment, and is often affected by human factors, resulting in large errors in the test results. Therefore, in order to solve the above problems, the present invention proposes an automated detection device for the copper content in the negative electrode sheet of a lithium-ion battery. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an automated detection device for the copper content in the negative electrode sheet of a lithium-ion battery, the device comprising a shredding module for the negative electrode sheet, a mobile clamping claw module, an ultrasonic cleaning module, a heat drying module, a weighing module, a human-computer interaction module, etc.; the shredding module is located at the upper left of the device, the mobile clamping claw module is in the center of the device, the weighing module is at the lower left of the device, the ultrasonic cleaning module is at the lower right of the device, the heat drying module is above the ultrasonic cleaning module, and the human-computer interaction module is at the upper right of the device; after the device is started, parameters are set through the human-computer interaction module to control the automatic operation of the device; the working process is that the negative electrode sheet is loaded from the entrance of the shredding module, and then is shredded into debris by the shredding module and falls into the screen of the mobile clamping claw module, and the mobile clamping claw module is used to move the negative electrode sheet to the negative electrode sheet. The clamping claw module moves the screen to the weighing module for the first weighing of mass M1; after weighing, the clamping claw module moves the debris to the cleaning chamber of the ultrasonic cleaning machine of the ultrasonic cleaning module, and the ultrasonic cleaning module starts the ultrasonic cleaning function to clean the debris. The impurities on the negative electrode sheet are cleaned, and the copper film debris remains in the screen; the clamping claw module moves the screen out of the ultrasonic cleaning chamber to the hot blow drying module, and the hot blow drying module removes the residual moisture in the copper film debris; the clamping claw module moves the screen to the weighing module again, and the weighing module weighs the mass M2 for the second time; calculations are performed based on the two weighings to obtain the copper content value of the negative electrode sheet, and finally presented to the user through the human-computer interaction module; for the user, it only takes two steps to operate the device to perform the test method.

[0006] A shredding module is further required, which includes a feed port, a drive motor, a shredding gear, etc. The shredding gear rotates under the drive of the drive motor to shred the negative electrode sheet coming in from the feed port and then drops it into the screen.

[0007] A mobile clamping module is further required, which includes a mobile support frame, a mobile block, a clamping jaw, a screen, etc. The clamping jaw is installed on the mobile block, and the mobile block is installed on the mobile support frame. The clamping jaw of the mobile block clamps the screen and can be moved from the weighing module to the ultrasonic cleaning module.

[0008] An ultrasonic cleaning module is further required, which includes a cleaning tank, a water volume control module, a water inlet, a water outlet, an ultrasonic generator, etc. The cleaning tank can accommodate a screen, the water volume control module controls the water volume in the cleaning tank, and the screen can be repeatedly flushed. The ultrasonic generator can emit ultrasonic waves to clean impurities on the electrode.

[0009] A hot blow drying module is further required, which includes a hot blower, an air volume controller, an exhaust fan, etc. After the impurities on the electrode are cleaned, the clamp is moved to lift the screen and move it to the hot blower. The fan controller controls the hot blower to heat and dry the screen, and the exhaust fan discharges water vapor.

[0010] A weighing module is further required, and the weighing module includes a precision balance, which can accurately obtain the mass of the object to be weighed.

[0011] A human-computer interaction module is further required, and the human-computer interaction module includes an automatically operated human-computer interaction software system, a display, a start button, a shut down button, an emergency switch, etc., and the display has a touch response function.

[0012] A human-computer interaction software system is further required. The human-computer interaction software system controls the entire device, installs the set step program execution, and communicates with each module in real time to obtain current action information, status information and measurement data information.

[0013] A step program is further required, and the step program is parameter setting. The negative electrode sheet is loaded, and the shredder is started to shred the electrode sheet, and the debris falls into the screen for weighing M1. After weighing, the mobile clamping claw module moves the debris to the cleaning chamber of the ultrasonic cleaning machine of the ultrasonic cleaning module. The ultrasonic cleaning module starts the ultrasonic cleaning function to clean the debris. The impurities on the negative electrode sheet are cleaned, and the copper film debris remains in the screen; the mobile clamping claw module moves the screen out of the ultrasonic cleaning chamber to the hot blowing module, and the hot blowing module removes the residual moisture in the copper film debris; the mobile clamping claw module moves the screen to the weighing module again, and the weighing module weighs the mass for the second time M2; the copper content value of the negative electrode sheet is calculated based on the two weighings, and finally presented to the user through the human-computer interaction module.

[0014] Further, a test method for an automated detection device for the copper content of a negative electrode sheet is required, and the operation of the device to perform the test method requires only two steps:

[0015] S1: Setting parameters, including shredding parameters, moving jaw control parameters, and calculating calibration parameters;

[0016] S2: Add the negative electrode sheet and start the device. After the device is working, the waste is removed. The waste removed is only the copper film fragments in the screen. The waste liquid of the ultrasonic cleaning module is automatically discharged.

[0017] It is further required to calculate the calibration parameters, which are the correction parameters of weighing M1 and M2 and the range calibration correction parameters of the sensor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Improve the accuracy of test results: The automatic detection device for the copper content of the negative electrode sheet realizes the automatic operation of "sample in - result out", reduces manual operation, reduces the error rate, and ensures the reliability of the test results.

[0020] 2. Achieve consistency in test results: The automated system can provide stable consistency, avoiding fluctuations caused by differences in operators.

[0021] 3. Reduce costs: In the long run, automated testing can reduce labor costs and maintenance costs and improve production efficiency.

[0022] 4. Advantages of data collection and analysis: The automatic detection device for the copper content of the negative electrode is equipped with a data recording function, which is convenient for subsequent data analysis and decision support.

[0023] 5. Improved safety: The automatic detection device for the copper content of the negative electrode can reduce the dangerous chemical experimental operations of the staff and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the device structure;

[0025] Figure 2 This is a schematic diagram of the shredding module structure;

[0026] Figure 3 It is a schematic diagram of the structure of the mobile gripper module;

[0027] Figure 4 Schematic diagram of the device working process.

[0028] In the figure:

[0029] 1 negative electrode sheet, 2 shredding module, 21 feeding port, 22 driving motor, 23 shredding gear, 3 moving clamping claw module, 31 moving support frame, 32 moving block, 33 clamping claw, 34, screen, 4 weighing module, 5 ultrasonic cleaning module, 6 hot drying module, 7 human-computer interaction module. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following examples are implemented on the premise of the technical solution of the present invention, provide detailed implementation methods and specific operation processes, and will help those skilled in the art to further understand the present invention. It should be pointed out that the protection scope of the present invention is not limited to the following embodiments, and several adjustments and improvements made under the premise of the concept of the present invention all belong to the protection scope of the present invention.

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. The above are only preferred embodiments of the present invention, and the patent scope of the present invention is not limited thereto. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the present invention in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0033] In the specific implementation process, the present invention provides an automatic detection device for the copper content in the negative electrode sheet of a lithium ion battery as follows:

[0034] like Figure 1As shown, the overall device includes a negative electrode sheet shredding module, a mobile clamping module, an ultrasonic cleaning module, a heat drying module, a weighing module, a human-computer interaction module, etc.; the shredding module is located at the upper left of the device, the mobile clamping module is in the center of the device, the weighing module is at the lower left of the device, the ultrasonic cleaning module is at the lower right of the device, the heat drying module is above the ultrasonic cleaning module, and the human-computer interaction module is at the upper right of the device; after the device is started, the parameters are set through the human-computer interaction module to control the automatic operation of the device; the working process is that the negative electrode sheet is loaded from the entrance of the shredding module, and then is shredded into debris by the shredding module and falls into the screen of the mobile clamping module, and the mobile clamping module moves the screen to the weighing module for the first Weigh the mass M1; after weighing, the mobile clamping module moves the debris to the cleaning chamber of the ultrasonic cleaning machine of the ultrasonic cleaning module, the ultrasonic cleaning module starts the ultrasonic cleaning function to clean the debris, the impurities on the negative electrode sheet are cleaned, and the copper film debris remains in the screen; the mobile clamping module moves the screen out of the ultrasonic cleaning chamber to the hot blow drying module, the hot blow drying module removes the residual moisture in the copper film debris; the mobile clamping module moves the screen to the weighing module again, and the weighing module weighs the mass M2 for the second time; according to the two weighings, calculations are performed to obtain the copper content value of the negative electrode sheet, and finally presented to the user through the human-computer interaction module; for the user, the operating device only requires two steps to perform the test method.

[0035] like Figure 2 As shown, the shredding module includes a feed port, a drive motor, a shredding gear, etc. The shredding gear rotates under the drive of the drive motor to shred the negative electrode sheet coming in from the feed port and then drops it into the screen.

[0036] like Figure 3 As shown, the mobile clamping claw module includes a mobile support frame, a mobile block, a clamping claw, a screen, etc. The clamping claw is installed on the mobile block, and the mobile block is installed on the mobile support frame. The mobile block clamping claw clamps the screen and can be moved from the weighing module to the ultrasonic cleaning module.

[0037] The ultrasonic cleaning module includes a cleaning tank, a water volume control module, a water inlet, a water outlet, an ultrasonic generator, etc. The cleaning tank can accommodate a screen. The water volume control module controls the water volume in the cleaning tank, and the screen can be repeatedly flushed. The ultrasonic generator can emit ultrasonic waves to clean impurities on the electrode.

[0038] The hot drying module includes a hot air blower, an air volume controller, an exhaust fan, etc. After the impurities on the electrode are cleaned, the clamp is moved to lift the screen and move it to the hot air blower. The fan controller controls the hot air blower to heat and dry the screen, and the exhaust fan discharges water vapor.

[0039] The weighing module includes a precision balance, which can accurately obtain the mass of the object to be weighed.

[0040] The human-computer interaction module includes an automatically operated human-computer interaction software system, a display, a start button, a shut-down button, an emergency switch, etc. The display has a touch response function.

[0041] The human-computer interaction software system controls the entire device and executes the set step program. The human-computer interaction software system communicates with each module in real time to obtain current action information, status information and measurement data information.

[0042] like Figure 4 As shown, the step program is parameter setting, loading the negative electrode sheet, the shredder starts to shred the electrode sheet, and the debris falls into the screen for weighing M1. After weighing, the mobile clamping claw module moves the debris to the cleaning chamber of the ultrasonic cleaning machine of the ultrasonic cleaning module. The ultrasonic cleaning module starts the ultrasonic cleaning function to clean the debris. The impurities on the negative electrode sheet are cleaned, and the copper film debris remains in the screen; the mobile clamping claw module moves the screen out of the ultrasonic cleaning chamber to the hot blowing module, and the hot blowing module removes the residual moisture in the copper film debris; the mobile clamping claw module moves the screen to the weighing module again, and the weighing module weighs the mass for the second time M2; the copper content value of the negative electrode sheet is calculated based on the two weighings, and finally presented to the user through the human-computer interaction module.

[0043] The test method of the automatic detection device for the copper content of the negative electrode sheet only requires two steps to operate the device:

[0044] S1: Setting parameters, including shredding parameters, moving jaw control parameters, and calculating calibration parameters;

[0045] S2: Add the negative electrode sheet and start the device. After the device is working, the waste is removed. The waste removed is only the copper film fragments in the screen. The waste liquid of the ultrasonic cleaning module is automatically discharged.

[0046] The calculated calibration parameters are the correction parameters of weighing M1 and M2, and the range calibration correction parameters of the sensor.

[0047] The present invention is further described below with reference to the embodiments, but the invention is not limited to the embodiments:

[0048] Example

[0049] In this embodiment, a 10×10 square centimeter negative electrode sheet is placed in a shredder for crushing to obtain debris with a mass M1 of 50 grams. After ultrasonic cleaning and hot air drying, the mass M2 is weighed again to obtain a mass of 20 grams. The copper content is automatically calculated to be 40%, and the result is directly output on the human-computer interaction module.

[0050] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. An automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery, characterized in that: The device includes a negative electrode sheet shredding module, a mobile clamping module, an ultrasonic cleaning module, a hot drying module, a weighing module, and a human-computer interaction module; the shredding module is located at the upper left of the device, the mobile clamping module is in the center of the device, the weighing module is at the lower left of the device, the ultrasonic cleaning module is at the lower right of the device, the hot drying module is above the ultrasonic cleaning module, and the human-computer interaction module is at the upper right of the device; after the device is started, parameters are set through the human-computer interaction module to control the automatic operation of the device; the working process is that the negative electrode sheet is loaded from the entrance of the shredding module, and then is shredded into debris by the shredding module and falls into the screen of the mobile clamping module, and the mobile clamping module moves the screen to the weighing module for the first weighing quality quantity M1; after weighing, the mobile clamping module moves the debris to the cleaning chamber of the ultrasonic cleaning machine of the ultrasonic cleaning module, the ultrasonic cleaning module starts the ultrasonic cleaning function to clean the debris, the impurities on the negative electrode sheet are cleaned, and the copper film debris remains in the screen; the mobile clamping module moves the screen out of the ultrasonic cleaning chamber to the hot blow drying module, the hot blow drying module removes the residual moisture in the copper film debris; the mobile clamping module moves the screen to the weighing module again, and the weighing module weighs the mass M2 for the second time; according to the two weighings, calculations are performed to obtain the copper content value of the negative electrode sheet, and finally presented to the user through the human-computer interaction module; for the user, it only takes two steps to operate the device to perform the test method.

2. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The shredding module includes a feed port, a drive motor, a shredding gear, etc. The shredding gear rotates under the drive of the drive motor to shred the negative electrode sheet coming in from the feed port and then drop it into the screen.

3. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The mobile clamping claw module includes a mobile support frame, a mobile block, a clamping claw, a screen, etc. The clamping claw is installed on the mobile block, and the mobile block is installed on the mobile support frame. The mobile block clamping claw clamps the screen and can be moved from the weighing module to the ultrasonic cleaning module.

4. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The ultrasonic cleaning module includes a cleaning tank, a water volume control module, a water inlet, a water outlet, an ultrasonic generator, etc. The cleaning tank can accommodate a screen. The water volume control module controls the water volume in the cleaning tank, and the screen can be repeatedly flushed. The ultrasonic generator can emit ultrasonic waves to clean impurities on the electrode.

5. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The hot drying module includes a hot air blower, an air volume controller, an exhaust fan, etc. After the impurities on the electrode are cleaned, the clamp is moved to lift the screen and move it to the hot air blower. The fan controller controls the hot air blower to heat and dry the screen, and the exhaust fan discharges water vapor.

6. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The weighing module includes a precision balance, which can accurately obtain the mass of the object to be weighed.

7. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The human-computer interaction module includes an automatically operated human-computer interaction software system, a display, a start button, a shut-down button, an emergency switch, etc. The display has a touch response function.

8. The automatic detection device for copper content in a negative electrode sheet of a lithium-ion battery according to claim 7, characterized in that: The human-computer interaction software system controls the entire device and executes according to the set step program. The human-computer interaction software system communicates with each module in real time to obtain current action information, status information and measurement data information.

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