A detection device for dispersion effect of lithium ion battery glue solution and a detection method thereof

Abstract

The application discloses a kind of lithium ion battery glue liquid dispersion effect detection device, it is characterized in that, including stirring tank, magnetic field generator and transfer tank;The upper portion of the stirring tank is provided with feed inlet;The discharge outlet of the stirring tank is communicated with the transfer tank by test pipeline;The top of the transfer tank is provided with vacuum pipeline, the vacuum pipeline is communicated with negative pressure source, for providing negative pressure environment for the transfer tank;The test pipeline passes through the magnetic field generator;The part of the test pipeline downstream of the magnetic field generator is provided with two electric potential test points, two electric potential test points are connected with electric potential acquisition device;The top of the transfer tank is provided with air pressure balance pipe;The valve is arranged on the test pipeline, the vacuum pipeline and the air pressure balance pipe.

Description

A device and method for detecting the dispersion effect of lithium-ion battery adhesive. Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, specifically to a device and method for detecting the dispersion effect of lithium-ion battery adhesive. Background Technology

[0002] Lithium-ion batteries are characterized by high operating voltage, high specific energy, large capacity, low self-discharge, good cycle performance, long lifespan, and are expected to become the lightweight and compact power source for future electric vehicles. They represent modern high-performance batteries and are ideal power sources for portable electronic devices such as mobile phones and laptops, as well as cordless power tools. For lithium-ion battery production, the preparation of the adhesive solution is the first critical step, directly affecting the quality of the electrodes and the battery itself, such as the consistency of battery capacity and internal resistance. To ensure the quality of lithium-ion batteries, the dispersion effect of the positive and negative electrode adhesive solutions is crucial. Currently, the uniformity of lithium-ion battery adhesive dispersion is mainly judged by rheology and transparency, which is highly subjective and difficult to assess. Summary of the Invention

[0003] The purpose of this invention is to provide a device for determining the dispersion effect of lithium-ion battery adhesive, so as to solve the problems of high subjectivity and randomness in the judgment of the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention discloses a device for detecting the dispersion effect of lithium-ion battery adhesive, comprising a stirring tank, a magnetic field generator, and a transfer tank; the stirring tank has an inlet at its upper part; the outlet of the stirring tank is connected to the transfer tank via a test pipe; a vacuum pipe is provided at the top of the transfer tank, and the vacuum pipe is connected to a negative pressure source to provide a negative pressure environment for the transfer tank; the test pipe passes through the magnetic field generator; two potential test points are provided on the downstream portion of the test pipe, and the two potential test points are connected to a potential acquisition device; a pressure balancing pipe is provided at the top of the transfer tank; valves are provided on the test pipe, the vacuum pipe, and the pressure balancing pipe.

[0006] A second objective of this invention is to provide a method for detecting the dispersion effect of lithium-ion battery adhesive, thereby quantitatively evaluating the dispersion effect. The method for detecting the dispersion effect of lithium-ion battery adhesive of this invention uses the detection device described above and includes the following steps:

[0007] Step 1: Add the prepared lithium-ion battery adhesive to the mixing tank;

[0008] Step 2: Draw negative pressure into the transfer tank to create a negative pressure environment.

[0009] Step 3: Open the valve on the test pipeline, start the magnetic field generator to apply a uniform magnetic field to the test pipeline, and the lithium-ion battery adhesive passes through the magnetic field generator and enters the transfer tank;

[0010] Step 4: The potential acquisition device collects and records the potential data from the two potential test points;

[0011] Step 5: Test multiple sets of potential data for each batch of adhesive solution added to the mixer, calculate the potential difference between the two potential test points in each set, and statistically analyze the potential differences.

[0012] Step 6: Calculate the range of the absolute values ​​of the multiple potential differences in Step 5. If the range is greater than the standard value, the dispersion effect of the battery adhesive is deemed unqualified. If the range is less than or equal to the standard value, the dispersion effect of the battery adhesive is deemed qualified. The standard value is ±3 sigma in the normal distribution of the multiple potential differences calculated in Step 5.

[0013] Furthermore, in step four, the potential is collected every 1-3 seconds.

[0014] The beneficial effects of this invention are as follows: This invention abandons the traditional method of judging dispersion effect by visually inspecting transparency, and instead uses the method of applying an electromagnetic field to the pipeline. By testing the change in potential difference, the magnitude of the concentration difference can be reflected, thereby determining the concentration consistency. High concentration consistency indicates high dispersion consistency. This method provides a more objective and simple way to quantitatively judge the dispersion effect of the adhesive. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the detection device of the present invention;

[0016] Attached reference numerals: 1. Stirring tank; 2. Magnetic field generator; 3. Potential acquisition device; 4. Transfer tank; 5. Vacuum pipeline; 6. Test pipeline; 7. Pressure balance pipe. Detailed Implementation

[0017] The technical solution of the present invention will be further described below with reference to Figure 1 and embodiments, so that those skilled in the art can more clearly understand the content of the technical solution.

[0018] This embodiment discloses a device for detecting the dispersion effect of lithium-ion battery adhesive, comprising a stirring tank, a magnetic field generator, and a transfer tank. The stirring tank has an inlet at its upper part. The outlet of the stirring tank is connected to the transfer tank via a test pipe. A vacuum pipe is located at the top of the transfer tank and is connected to a negative pressure source to provide a negative pressure environment for the transfer tank. The test pipe passes through the magnetic field generator. Two potential testing points are located on the downstream portion of the test pipe, and these two potential testing points are connected to a potential acquisition device. A pressure balancing pipe is located at the top of the transfer tank. Valves are installed on the test pipe, the vacuum pipe, and the pressure balancing pipe. The potential acquisition device and the magnetic field generator in this embodiment are existing devices without any modifications; therefore, their structures are not described in detail here.

[0019] The present invention provides a method for detecting the dispersion effect of lithium-ion battery adhesive, comprising the following steps:

[0020] Step 1: Add the prepared lithium-ion battery adhesive to the mixing tank;

[0021] Step 2: Apply negative pressure to the transfer tank to create a negative pressure environment. The vacuum level inside the transfer tank is -0.075 MPa to -0.1 MPa.

[0022] Step 3: Open the valve on the test pipeline and start the magnetic field generator to apply a uniform magnetic field to the test pipeline with a magnetic field strength of 8000±2000 Gs. The lithium-ion battery adhesive passes through the magnetic field generator and enters the transfer tank.

[0023] Step 4: The potential acquisition device collects potential data from two potential test points. The potential acquisition period is every 1-3 seconds, and the data is recorded.

[0024] Step 5: Test multiple sets of potential data for the adhesive solution added to the mixer, and calculate the potential difference between the two potential test points in each set. Statistically analyze the potential differences; the potential difference data is shown in the table below.

[0025] Step 6: Calculate the range of the absolute values ​​of the multiple potential differences in Step 5. If the range is greater than the standard value, the dispersion effect of the battery adhesive is deemed unqualified. If the range is less than or equal to the standard value, the dispersion effect of the battery adhesive is deemed qualified. The standard value is ±3 sigma in the normal distribution of the multiple potential differences calculated in Step 5.

[0026] In this embodiment, the mean value of the potential difference is -0.028, and the range of the absolute value of the potential difference is 0.41. The standard value calculated based on the potential difference data is -0.028 ± 3 * 0.1895, which is between -0.5965 and 0.5405. Therefore, the dispersion effect of the battery adhesive in this embodiment is qualified. This invention provides a method for quantitatively judging the dispersion effect of the adhesive, which is more objective and simpler than the traditional visual method.

[0027]

[0028]

Claims

1. A device for detecting the dispersion effect of lithium-ion battery adhesive, characterized in that, The system includes a mixing tank, a magnetic field generator, and a transfer tank. The mixing tank has a feed inlet at its upper part. The discharge outlet of the mixing tank is connected to the transfer tank via a test pipe. A vacuum pipe is installed at the top of the transfer tank, and this vacuum pipe is connected to a negative pressure source to provide a negative pressure environment for the transfer tank. The test pipe passes through the magnetic field generator. Two potential testing points are installed on the downstream portion of the test pipe, and these two potential testing points are connected to a potential acquisition device. A pressure balancing pipe is installed at the top of the transfer tank. Valves are installed on the test pipe, the vacuum pipe, and the pressure balancing pipe.

2. A method for detecting the dispersion effect of lithium-ion battery adhesive, characterized in that, The detection device as described in claim 1 includes the following steps: Step 1: Add the prepared lithium-ion battery adhesive to the mixing tank; Step 2: Draw negative pressure into the transfer tank to create a negative pressure environment; Step 3: Open the valve on the test pipeline, start the magnetic field generator to apply a uniform magnetic field to the test pipeline, and the lithium-ion battery adhesive passes through the magnetic field generator and enters the transfer tank; Step 4: The potential acquisition device collects and records the potential data at two potential test points; Step 5: Test multiple sets of potential data for each portion of adhesive added to the mixer, calculate the potential difference between the two potential test points in each set, and statistically analyze the potential differences; Step 6: Calculate the range of the absolute values ​​of the multiple potential differences in Step 5. If the range is greater than the standard value, the dispersion effect of the battery adhesive is considered unqualified; if the range is less than or equal to the standard value, the dispersion effect of the battery adhesive is considered qualified; wherein the standard value is ±3 sigma in the normal distribution of the multiple potential differences calculated in Step 5.

3. The method for detecting the dispersion effect of lithium-ion battery adhesive as described in claim 2, characterized in that, In step four, the potential is collected every 1-3 seconds.

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