A quality detection device, detection method and use method of a valve group for lithium battery formation process

Abstract

The application further provides a quality detection device, a detection method and a use method of a valve group for a lithium battery formation process, comprising a box body, battery clamps, a pressure module, a control module and a pipeline module; the battery clamps are provided with two, each battery clamp comprises a clamp seat, a clamp spring and a clamp sealing chuck; the pressure module comprises a negative pressure module, a high-precision pressure regulating valve body, a PLC control module and a two-position three-way valve; the control module comprises a PLC device and an Internet of Things module; the pipeline module comprises a pipeline in the box body, an external pipeline gas outlet pipe, an external pipeline working condition gas inlet pipe, a gas compression device, a waste liquid and waste gas flow regulating valve, a waste liquid and waste gas pump body and a sensor; further comprising an external pipeline clean gas inlet pipe, a cover plate and a magnetic suction plate, the magnetic suction plate is used for placing the control module, and a corresponding magnetic suction structure is arranged on the back of the control module.

Description

Technical Field

[0001] This invention relates to the field of lithium battery formation technology, and in particular to a quality inspection device, inspection method and usage method for valve groups used in lithium battery formation process. Background Technology

[0002] In the lithium battery formation process, formation is also called activation. It is the process of activating the positive and negative electrode materials inside the battery after it is manufactured by charging and discharging in a certain way to improve the overall performance of the battery. This process requires the use of corresponding valve groups, but the performance of some valve groups can only be known after use. Therefore, the detection device needs to perform the following three functions according to the detection requirements of valve group performance: (1) Check whether the valve group can remove the waste gas generated in the formation process (2) Check whether the valve group can ensure that the gas pressure inside the cell is maintained within the optimal working pressure range during operation (3) Check whether the anti-crystallization ability of the valve group can ensure that the designed product components will not be corroded by waste gas and stop working, and check the anti-crystallization ability of the valve group in the working condition (working condition refers to the working condition / environment of the valve body under normal operation; in the lithium battery formation process, after the working condition gas undergoes gas-liquid separation, there will still be some waste gas that is easy to crystallize and corrode. When the working condition gas flows through the valve body, this part of the waste gas may crystallize at the corner inside the valve body. Excessive crystallization will cause the cavity to be blocked and affect the working capacity of the valve body).

[0003] Currently, commonly used valve body testing methods include bubble method, soap bubble method, special tracer substance method, water pressure method, ultrasonic method, pressure drop method, and valve internal leakage temperature method.

[0004] However, the above methods all have certain limitations. For example, artificial methods such as bubble, soap bubble, and water pressure are simple to operate and have low cost, but they are inefficient and greatly affected by external factors. The special tracer method and ultrasonic method have relatively strict requirements in terms of cost and operation difficulty. The pressure drop and valve internal leakage temperature method are difficult to solve in terms of equipment cost and installation cost. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a quality inspection device, inspection method and usage method for valve groups used in lithium battery formation process, so as to realize the performance inspection of valve bodies used in lithium battery formation, and at the same time have the advantages of fast response speed, high precision, good reliability and simple maintenance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a quality inspection device for valve groups used in lithium battery formation process, comprising a housing (4), a battery clamp, a pressure module, a control module, and a pipeline module;

[0007] The battery clamp is provided in two parts, each battery clamp including a clamp base (1), a clamp spring (2) and a clamp sealing chuck (3);

[0008] The pressure module includes a negative pressure module (6), a high-precision pressure regulating valve body (13), a PLC control module (8), and a two-position three-way valve (12).

[0009] The control module comprises a PLC device and an Internet of Things (IoT) module.

[0010] The pipeline module includes an internal pipeline (5), an external pipeline outlet pipe (7), an external pipeline working condition gas inlet pipe (11), a gas compression device, a waste liquid and waste gas flow regulating valve (9), a waste liquid and waste gas pump body (10), and a sensor (17).

[0011] It also includes an external pipeline clean gas inlet pipe (16), a cover plate (15), and a magnetic suction plate (14). The magnetic suction plate (14) is used to place the control module, and the back of the control module is provided with a corresponding magnetic suction structure.

[0012] In a preferred embodiment, the two battery clamps are arranged symmetrically, and the two clamp sealing jaws (3) move toward each other to form a clamping space to clamp the battery.

[0013] In a preferred embodiment, the pipeline (5) inside the box includes a first pipeline and a second pipeline; one end of the first pipeline is connected to the waste liquid and waste gas pump body (10), and the two-position three-way valve (12) is connected to the other end of the first pipeline, one end of the second pipeline and the external pipeline inlet pipe (11) respectively; the other end of the second pipeline is connected to the sensor (15).

[0014] In a preferred embodiment, a high-precision pressure regulating valve body (13) is also connected between the first pipeline and the second pipeline.

[0015] In a preferred embodiment, the internal pipe (5) is also connected to a negative pressure module (6) and an external air outlet pipe (7).

[0016] This invention also provides a quality inspection method for valve assemblies used in lithium battery formation processes, employing the aforementioned quality inspection device for valve assemblies used in lithium battery formation processes; including the following inspection modes:

[0017] Test the air tightness of the valve body; the negative pressure module (6) and the pipeline module are turned on to release the corresponding working gas of the valve body. According to the pressure status measured by the sensor (17), the control module judges whether the requirements are met after processing the signal. According to the judgment, the data is recorded and the alarm is triggered and the test is stopped, or the data is recorded and the test is stopped.

[0018] Test the valve body pressure regulation performance and early warning system performance. By controlling the pipeline module and the negative pressure module (6), simulate the sudden situation that may occur when the valve body is working, check the pipeline blockage, valve cavity blockage, pipeline leakage problem, test whether the alarm performance of the valve body is perfect, whether it can sense the state and respond in a timely and fast manner, stop working or issue an alarm signal on its own; by controlling the high-precision pressure regulating valve body (13) in the pipeline module, simulate the change of internal pressure of the valve body during operation, and the control module processes the signal fed back by the sensor (17) after the valve body detects the pressure change and adjusts it, judge whether the valve body can complete the adjustment of the internal pressure according to the pressure curve, and judge whether it meets the requirements according to the fitting pressure-time curve of the valve body;

[0019] To test the anti-crystallization performance, the valve body's anti-crystallization ability was simulated under special working conditions by using the negative pressure module (6) and the waste liquid and waste gas module. After adjusting the gas through the waste liquid and waste gas device for a period of time, clean gas was then input. Based on the pressure feedback from the sensor, the exhaust gas performance and anti-crystallization performance were tested. After the clean gas was discharged for a period of time, the valve body was removed and the crystallization state of the valve body was checked. The anti-crystallization performance of the valve body was judged by combining the sensor (17) data under the same pressure.

[0020] The present invention also provides a method for using a quality inspection device for valve groups in lithium battery formation process. The method employs the aforementioned quality inspection device for valve groups in lithium battery formation process and includes the following steps: after clamping, turn on the switch and perform quality inspection of valve body performance in the order of sealing test, alarm test, adjustment test, and anti-crystallization test.

[0021] When the test begins, the negative pressure module (6) and the pipeline module are opened. The clean gas inlet pipe (16) of the external pipeline releases clean gas. The self-test device checks for problems. If there are no problems, the working gas inlet pipe (11) of the external pipeline releases the corresponding working gas when the valve body is working. According to the pressure measured by the sensor (17), the PLC control module (8) processes the signal and judges whether it meets the requirements. Based on the judgment, the next test is performed or the alarm stops the test and records it.

[0022] If there are no problems and the requirements are met, the next test will be conducted. The test simulates the sudden situations that may occur when the valve body is working, such as pipeline blockage, in which case the two-position three-way valve (12) will be closed; if the valve cavity is blocked, the high-precision pressure regulating valve (13) will reduce the pressure to the corresponding level; if the pipeline leaks, the high-precision pressure regulating valve (13) will adjust the pressure to the ambient atmospheric pressure. The test will determine whether the alarm performance of the valve body is perfect, whether it can sense the status and respond quickly and promptly, and stop working or issue an alarm signal on its own; the PLC control module (8) will determine whether the valve body meets the quality requirements based on the response of the valve body, and will conduct the next test or alarm stop test and record the results based on the judgment.

[0023] If there are no problems and the requirements are met, the next test will be carried out. The pressure change inside the valve body will be simulated during operation by the high-precision pressure regulating valve body (13). The PLC control module (8) will process the signal fed back by the sensor (17) after the valve body detects the pressure change and adjusts it, and determine whether the valve body can complete the adjustment of the valve body pressure according to the pressure curve. The system will also determine whether the requirements are met based on the valve body fitting the pressure-time curve. The next test will be carried out or the test will be stopped by alarm and recorded based on the judgment.

[0024] If there are no problems and the requirements are met, proceed to the next test. Simulate the anti-crystallization ability of the valve body under special working conditions through the pipeline module. Extract gas through the waste liquid and waste gas pump body (10) and adjust the gas flow through the waste liquid and waste gas flow regulating valve (9). After a period of time, clean gas is then input through the external pipeline clean gas inlet pipe (16). Detect its exhaust gas performance and anti-crystallization performance based on the pressure feedback from the sensor (17). After the clean gas has been discharged for a period of time, remove the valve body and check its anti-crystallization performance.

[0025] After each test is completed, regardless of whether it meets the requirements, a data record report will be generated, which will be temporarily stored in the PLC control module (8) and then uploaded to the host computer.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Comprehensive testing structure design: The host computer sends the required test items to the PLC module in the control module according to different valve body types. Then, the control box in the control module controls the testing platform and cooperates with external related pipelines to complete the test items required for different types of valve bodies.

[0028] 2. Comprehensive testing method: During the testing process, based on the signals sent by the host computer, various modules are combined to achieve different performance tests of the valve body under test. For example, the negative pressure module and the pipeline module work together to test the airtightness of the valve body; the waste liquid module, pipeline module, and negative pressure module work together to complete the anti-crystallization performance test of the valve body after receiving the control signal; the pipeline module, negative pressure module, and control module work together to achieve the adjustment performance and early warning detection of the valve body through a high-precision pressure regulating valve.

[0029] 3. Real-time recording and storage of signals; During the test, the PLC module will complete a data recording and storage and send the recorded data upwards every time it receives a signal from the pressure sensor; If the stop button is pressed, it will still complete a recording again after sending a stop signal to other modules; If the emergency stop button is pressed, it will record the last signal sent by the pressure sensor before the emergency stop button is pressed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the device according to a preferred embodiment of the present invention (I);

[0031] Figure 2 A cross-sectional view (AA) of the overall structure diagram (I) of the preferred embodiment of the device of the present invention;

[0032] Figure 3 This is a schematic diagram (II) of the overall structure of the device according to a preferred embodiment of the present invention.

[0033] Figure 4 A BB cross-sectional view of the overall structure diagram (II) of the preferred embodiment of the device of the present invention;

[0034] Figure 5 This is a schematic diagram of the control module operation interface according to a preferred embodiment of the present invention;

[0035] Figure 6 This is a flowchart illustrating the operation of a preferred embodiment of the present invention;

[0036] Figure 7 This is a control principle diagram of a preferred embodiment of the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] In lithium-ion battery formation processes, formation, also known as activation, is the process of activating the positive and negative electrode materials inside the battery after manufacturing through specific charging and discharging methods to improve the overall performance of the battery. Formation is a very complex process and also a crucial step affecting battery performance. During the first charge of the battery, a passivation thin layer inevitably forms on the surface of the carbon electrode at the interface between the carbon negative electrode and the electrolyte. This layer is called the solid electrolyte interphase (SEI) film, and the quality of the SEI film formation directly affects the quality of the battery.

[0041] Principle of gasification:

[0042] The main reason for gas generation during battery formation is the formation of an SEI layer on the electrolyte and electrode surfaces during the initial discharge. This causes the electrolyte solvent system to decompose, producing hydrocarbon gases. The type of gas is related to the electrolyte composition. During storage, a small number of batteries exhibit gas expansion. The reasons for this gas generation may be: firstly, poor battery sealing allows moisture and air to seep in, leading to a significant increase in CO2, along with considerable amounts of O2 and N2. Simultaneously, moisture infiltration leads to HF generation, which damages the SEI layer; secondly, the SEI layer formed during initial formation is unstable. If the SEI layer is damaged during storage, gases, primarily hydrocarbons, are released to repair it.

[0043] (2) SEI film

[0044] During the initial charge and discharge of a lithium-ion battery, a small amount of polar aprotic solvent in the electrolyte undergoes a reduction reaction after gaining some electrons. This solvent combines with lithium ions to form an interface film approximately 100-120 nm thick, known as the SEI (Sediment Intercalation Layer). The SEI typically forms at the solid-liquid interface between the electrode material and the electrolyte. When the lithium-ion battery begins charging, lithium ions are extracted from the active material of the positive electrode, enter the electrolyte, penetrate the separator, and then re-enter the electrolyte. Finally, they are embedded in the layered voids of the carbon material of the negative electrode, completing a full insertion-extraction process. At this time, electrons emerge from the positive electrode along the external circuit and enter the carbon material of the negative electrode. Redox reactions occur between electrons, the solvent in the electrolyte, and lithium ions. Solvent molecules accept electrons and combine with lithium ions to form the SEI, generating gases such as H2, CO, and CH2. As the SEI thickness increases until electrons can no longer penetrate, a passivation layer is formed, inhibiting the continued redox reaction.

[0045] The role of the SEI (Sediment Interlayer) should be analyzed from its inherent characteristics, which are: ① The SEI is an interfacial layer between the electrode material and the electrolyte, separating the two. ② It exhibits characteristics of a solid electrolyte. ③ Li+ ions can pass through easily (as excellent conductors of lithium ions), while electrons cannot. The SEI has a significant impact on the performance of carbon anode lithium-ion batteries.

[0046] (3) Pressure-time curve

[0047] The pressure-time curve of a lithium-ion battery formation process refers to the curve showing how the internal pressure of the battery changes over time during the formation process. This curve reflects the generation and removal of gases during the formation process, as well as the battery's sealing performance and safety.

[0048] The shape and characteristic parameters of the pressure-time curve can reflect the formation effect and quality of the battery. Different formation conditions will affect the shape and parameters of the pressure-time curve, thus affecting the quality of the battery. For example, the pressure rise rate can reflect the reduction reaction activity of the electrolyte, the pressure plateau value can reflect the battery's safety performance, the pressure fall rate can reflect the battery's gas tightness, and the pressure stability value can reflect the battery's gas consumption, etc.

[0049] Different formation conditions affect the shape and parameters of the pressure-time curve, thus impacting battery quality. For example, formation current density, formation cutoff voltage, formation temperature, and applied pressure all influence the pressure-time curve. Generally, appropriate formation conditions should result in a smooth, flat, and symmetrical pressure-time curve, avoiding excessively high or low pressures to ensure battery performance and lifespan.

[0050] refer to Figure 1-7 A quality inspection device for valve groups used in lithium battery formation process includes a housing 4, a battery clamp, a pressure module, a control module, and a pipeline module.

[0051] Two battery clamps are provided, each including a clamp base 1, a clamp spring 2, and a clamp sealing chuck 3; the two battery clamps are arranged symmetrically, and the two clamp sealing chucks 3 move towards each other to form a clamping space to clamp the battery. The battery clamps hold the battery stably at the designated work position.

[0052] The pressure module includes a negative pressure module 6, a high-precision pressure regulating valve body 13, a PLC control module 8, and a two-position three-way valve 12.

[0053] The pressure module is responsible for simulating the pressure environment within the valve body and pipelines during the lithium battery formation process. The negative pressure module 6 provides the pressure supply for the quality testing device, while the high-precision pressure regulating valve 13 works in conjunction with the PLC control module 8, controlled by the PLC. The PLC obtains pressure-time slice data (obtained from the pressure-time curve; the pressure-time curve in the lithium battery formation process refers to the curve showing the change in internal battery pressure over time during formation. This curve reflects the gas generation and removal during formation, as well as the battery's sealing performance and safety. The shape and characteristic parameters of the pressure-time curve reflect the formation effect and quality of the battery) based on the control data and controls the pressure regulating valve accordingly, thereby simulating the pressure within the cell chamber to complete the qualification test of the valve body's sealing and regulating performance.

[0054] The control module consists of a PLC device and an Internet of Things (IoT) module; it is responsible for the overall control of the detection device, sending test data and test results to the host computer, and receiving the signal from the pressure sensor 17 in the pipeline module. After processing by the expert system, it sends a pressure regulation signal to the pressure module (the PLC module, as the information processing device inside the detection platform, processes the signal transmitted by the pressure sensor 17 and sends it to the host computer after sorting it out).

[0055] The piping module includes an internal pipe 5, an external gas outlet pipe 7, an external working gas inlet pipe 11, a gas compression device, a waste liquid / waste gas flow regulating valve 9, a waste liquid / waste gas pump body 10, and a sensor 17. This piping module, in conjunction with the pressure and control modules, performs testing, simulating various environments the valve body encounters during operation, such as a pure gas state (containing relatively little waste gas and in a relatively dry state) under normal operating conditions, or a state under abnormal operating conditions where waste gas is mixed with humid, easily crystallizing, corrosive gases (containing relatively much waste gas and in a relatively humid state). It is used to test the valve body's sealing performance, anti-crystallization properties, and the fault detection function of the valve assembly.

[0056] It also includes an external clean gas inlet pipe 16, a cover plate 15, and a magnetic plate 14. The magnetic plate 14 is used to place the control module, and the back of the control module is provided with a corresponding magnetic structure.

[0057] The internal pipeline 5 includes a first pipeline and a second pipeline; one end of the first pipeline is connected to the waste liquid and waste gas pump body 10, and the two-position three-way valve 12 is connected to the other end of the first pipeline, one end of the second pipeline, and the external pipeline inlet pipe 11 respectively; the other end of the second pipeline is connected to the sensor 15.

[0058] A high-precision pressure regulating valve body 13 is also connected between the first pipeline and the second pipeline.

[0059] The internal pipe 5 is also connected to the negative pressure module 6 and the external air outlet pipe 7.

[0060] A quality inspection method for valve assemblies used in lithium battery formation processes, employing the aforementioned quality inspection device for valve assemblies used in lithium battery formation processes; Reference Figure 5 The detection modes include the following:

[0061] Apart from the emergency stop button, the external control box of the control module contains: various functional test module model buttons; an Auto button for automatically completing a series of tests; an On / Stop button for starting and pausing; and a display panel for indicating the current test status.

[0062] After the valve body under test is clamped, turn on the emergency stop button and press the on button. The testing platform will start self-checking to check whether the valve body under test is clamped correctly. If it is not clamped correctly, the panel will display "Incorrect clamping". If it is clamped correctly, the panel will display "Correct clamping". Once the correct clamping is displayed, the performance test can begin.

[0063] The functions of each button are as follows:

[0064] Press the Auto button to automatically run the three preset detection modes in sequence;

[0065] Press model1 to test the valve body's airtightness. Negative pressure module 6 and pipeline module are activated, releasing the corresponding working gas from the valve body. Based on the pressure measured by sensor 17, the control module processes the signal and determines whether it meets the requirements. Depending on the determination, it records the data, triggers an alarm, and stops the test, or records the data and stops the test.

[0066] Pressing Model 2 tests the valve body's pressure regulation performance and early warning system performance. Through the control pipeline module and negative pressure module 6, it simulates unexpected situations that may occur during valve operation, such as pipeline blockage, valve cavity blockage, and pipeline leakage. This tests the valve body's alarm performance to ensure it can promptly and quickly detect and respond to changes, automatically stopping operation or issuing an alarm signal. The high-precision pressure regulating valve body 13 in the control pipeline module simulates internal pressure changes during operation. The control module processes the signal fed back by sensor 17 after the valve body detects and adjusts the pressure change, determining whether the valve body can regulate the internal pressure according to the pressure curve and whether it meets the requirements based on the valve body's fitted pressure-time curve.

[0067] Press Model 3 to test anti-crystallization performance. Using the negative pressure module 6 and the waste liquid / exhaust gas module, simulate the valve body's anti-crystallization capability under special working conditions. The waste liquid / exhaust gas device regulates the gas flow to maximize the mixing of waste gas within the valve body's anti-crystallization range. After a period of time, clean gas is then introduced. Based on the pressure feedback from the sensors, the exhaust gas discharge performance and anti-crystallization performance are tested. After the clean gas has been discharged for a period, the valve body is removed, and the crystallization state is manually observed. Combined with the data from sensor 17 under the same pressure, the valve body's anti-crystallization performance is determined.

[0068] The on / stop buttons work together to interrupt or resume operation. Pressing the stop button immediately stops the machine from working and completely cuts off power after a short period. If the on button is pressed within the specified time, the unfinished work will resume.

[0069] Press the red emergency stop button: The entire machine will immediately lose power, all operations will stop, and the PLC module will stop receiving signals.

[0070] A method for using a quality inspection device for a valve assembly in a lithium battery formation process, comprising the above-mentioned quality inspection device for a valve assembly in a lithium battery formation process, including the following steps: after clamping, turn on the switch and perform quality inspection of the valve body performance in the order of sealing test, alarm test, adjustment test, and anti-crystallization test.

[0071] The test begins. The negative pressure module 6 and the pipeline module are opened. The clean gas inlet pipe 16 of the external pipeline releases clean gas. The self-test device checks for problems. If there are no problems, the working gas inlet pipe 11 of the external pipeline releases the corresponding working gas when the valve body is working. According to the pressure measured by the sensor 17, the PLC control module 8 processes the signal and determines whether it meets the requirements. Based on the determination, the next test is performed or the test is stopped by alarm and recorded.

[0072] If there are no problems and the requirements are met, proceed to the next test. This test simulates unexpected situations that may occur during valve operation, such as pipeline blockage, in which case the two-position three-way valve 12 will close; if the valve cavity is blocked, the high-precision pressure regulating valve 13 will reduce the pressure to the appropriate level; if there is pipeline leakage, the high-precision pressure regulating valve 13 will adjust the pressure to ambient atmospheric pressure. This test assesses the valve's alarm performance, whether it can promptly and quickly sense and respond to the status, automatically stop working, or issue an alarm signal. The PLC control module 8 determines whether the valve's response meets the quality requirements, and based on the determination, proceeds to the next test or stops the test with an alarm and records the results.

[0073] If there are no problems and the requirements are met, proceed to the next test. The high-precision pressure regulating valve body 13 simulates the pressure change inside the valve body during operation. The PLC control module 8 processes the signal fed back by the sensor 17 after the valve body detects the pressure change and adjusts it. It judges whether the valve body can adjust the internal pressure according to the pressure curve and judges whether it meets the requirements based on the valve body's fitting pressure-time curve. Based on the judgment, proceed to the next test or stop the test with an alarm and record the results.

[0074] If there are no problems and the requirements are met, proceed to the next test. Simulate the valve body's anti-crystallization ability under special working conditions using the pipeline module. Extract gas through the waste liquid and waste gas pump body 10 and adjust the gas flow using the waste liquid and waste gas flow regulating valve 9. After a period of time, clean gas is then introduced through the external clean gas inlet pipe 16. Based on the pressure feedback from the sensor 17, test its exhaust gas performance and anti-crystallization performance. After the clean gas has been discharged for a period of time, remove the valve body and check its anti-crystallization performance.

[0075] After each test is completed, regardless of whether it meets the requirements, a data record report will be generated, temporarily stored in PLC control module 8, and then uploaded to the host computer.

Claims

1. A method for quality inspection of valve assemblies used in lithium battery formation processes, characterized in that, A quality inspection device for valve groups used in lithium battery formation process is adopted; the quality inspection device includes a housing (4), battery clamps, pressure module, control module and pipeline module; The battery clamp is provided in two parts, each battery clamp including a clamp base (1), a clamp spring (2) and a clamp sealing chuck (3); The pressure module includes a negative pressure module (6), a high-precision pressure regulating valve body (13), a PLC control module (8), and a two-position three-way valve (12). The control module includes a PLC device and an Internet of Things (IoT) module; The pipeline module includes an internal pipeline (5), an external pipeline outlet pipe (7), an external pipeline working condition gas inlet pipe (11), a gas compression device, a waste liquid and waste gas flow regulating valve (9), a waste liquid and waste gas pump body (10), and a sensor (17). It also includes an external pipeline clean gas inlet pipe (16), a cover plate (15), and a magnetic plate (14). The magnetic plate (14) is used to place the control module, and the back of the control module is provided with a corresponding magnetic structure. The detection methods include the following detection modes: Test the air tightness of the valve body; the negative pressure module (6) and the pipeline module are turned on to release the corresponding working gas of the valve body. According to the pressure status measured by the sensor (17), the control module judges whether the requirements are met after processing the signal. According to the judgment, the data is recorded and the alarm is triggered and the test is stopped, or the data is recorded and the test is stopped. Test the valve body pressure regulation performance and early warning system performance. By controlling the pipeline module and the negative pressure module (6), simulate the sudden situation that may occur when the valve body is working, check the pipeline blockage, valve cavity blockage, pipeline leakage problem, test whether the alarm performance of the valve body is perfect, whether it can sense the state and respond in a timely and fast manner, stop working or issue an alarm signal on its own; by controlling the high-precision pressure regulating valve body (13) in the pipeline module, simulate the change of internal pressure of the valve body during operation, and the control module processes the signal fed back by the sensor (17) after the valve body detects the pressure change and adjusts it, judge whether the valve body can complete the adjustment of the internal pressure according to the pressure curve, and judge whether it meets the requirements according to the fitting pressure-time curve of the valve body; To test the anti-crystallization performance, the valve body's anti-crystallization ability was simulated under special working conditions by using the negative pressure module (6) and the waste liquid and waste gas module. After adjusting the gas through the waste liquid and waste gas device for a period of time, clean gas was then input. Based on the pressure feedback from the sensor, the exhaust gas performance and anti-crystallization performance were tested. After the clean gas was discharged for a period of time, the valve body was removed and the crystallization state of the valve body was checked. The anti-crystallization performance of the valve body was judged by combining the sensor (17) data under the same pressure.

2. A method for using a quality inspection device for valve assemblies in a lithium battery formation process, characterized in that, A quality inspection device for valve groups used in lithium battery formation process is adopted. The quality inspection device includes a housing (4), a battery clamp, a pressure module, a control module and a pipeline module. The battery clamp is provided in two parts, each battery clamp including a clamp base (1), a clamp spring (2) and a clamp sealing chuck (3); The pressure module includes a negative pressure module (6), a high-precision pressure regulating valve body (13), a PLC control module (8), and a two-position three-way valve (12). The control module includes a PLC device and an Internet of Things (IoT) module; The pipeline module includes an internal pipeline (5), an external pipeline outlet pipe (7), an external pipeline working condition gas inlet pipe (11), a gas compression device, a waste liquid and waste gas flow regulating valve (9), a waste liquid and waste gas pump body (10), and a sensor (17). It also includes an external pipeline clean gas inlet pipe (16), a cover plate (15), and a magnetic plate (14). The magnetic plate (14) is used to place the control module, and the back of the control module is provided with a corresponding magnetic structure. The usage method includes the following steps: After clamping, turn on the switch and perform quality tests on the valve body performance in the following order: sealing test, alarm test, adjustment test, and anti-crystallization test. When the test begins, the negative pressure module (6) and the pipeline module are opened. The clean gas inlet pipe (16) of the external pipeline releases clean gas. The self-test device checks for problems. If there are no problems, the working gas inlet pipe (11) of the external pipeline releases the corresponding working gas when the valve body is working. According to the pressure measured by the sensor (17), the PLC control module (8) processes the signal and judges whether it meets the requirements. Based on the judgment, the next test is performed or the alarm stops the test and records it. If there are no problems and the requirements are met, the next test will be conducted. The test simulates the sudden situations that may occur when the valve body is working, such as pipeline blockage, in which case the two-position three-way valve (12) will be closed; if the valve cavity is blocked, the high-precision pressure regulating valve (13) will reduce the pressure to the corresponding level; if the pipeline leaks, the high-precision pressure regulating valve (13) will adjust the pressure to the ambient atmospheric pressure. The test will determine whether the alarm performance of the valve body is perfect, whether it can sense the status and respond quickly and promptly, and stop working or issue an alarm signal on its own; the PLC control module (8) will determine whether the valve body meets the quality requirements based on the response of the valve body, and will conduct the next test or alarm stop test and record the results based on the judgment. If there are no problems and the requirements are met, the next test will be carried out. The pressure change inside the valve body will be simulated during operation by the high-precision pressure regulating valve body (13). The PLC control module (8) will process the signal fed back by the sensor (17) after the valve body detects the pressure change and adjusts it, and determine whether the valve body can complete the adjustment of the valve body pressure according to the pressure curve. The system will also determine whether the requirements are met based on the valve body fitting the pressure-time curve. The next test will be carried out or the test will be stopped by alarm and recorded based on the judgment. If there are no problems and the requirements are met, proceed to the next test. Simulate the anti-crystallization ability of the valve body under special working conditions through the pipeline module. Extract gas through the waste liquid and waste gas pump body (10) and adjust the gas flow through the waste liquid and waste gas flow regulating valve (9). After a period of time, clean gas is then input through the external pipeline clean gas inlet pipe (16). Detect its exhaust gas performance and anti-crystallization performance based on the pressure feedback from the sensor (17). After the clean gas has been discharged for a period of time, remove the valve body and check its anti-crystallization performance. After each test is completed, regardless of whether it meets the requirements, a data record report will be generated, which will be temporarily stored in the PLC control module (8) and then uploaded to the host computer.

3. A quality inspection device for valve assemblies used in lithium battery formation processes, characterized in that, The method for quality inspection of a valve group for lithium battery formation process as described in claim 1 or the method for using a valve group for quality inspection of lithium battery formation process as described in claim 2 are described above. The two battery clamps are arranged axially symmetrically, and the two clamp sealing chucks (3) move towards each other to form a clamping space to clamp the battery.

4. The quality inspection device for valve groups used in lithium battery formation process according to claim 3, characterized in that, The internal pipeline (5) of the box includes a first pipeline and a second pipeline; one end of the first pipeline is connected to the waste liquid and waste gas pump body (10), and the two-position three-way valve (12) is connected to the other end of the first pipeline, one end of the second pipeline and the external pipeline air inlet pipe (11) respectively; the other end of the second pipeline is connected to the sensor (15).

5. A quality inspection device for valve groups used in lithium battery formation process according to claim 4, characterized in that, A high-precision pressure regulating valve body (13) is also connected between the first pipeline and the second pipeline.

6. The quality inspection device for valve groups used in lithium battery formation process according to claim 5, characterized in that, The internal pipe (5) of the box is also connected to the negative pressure module (6) and the external pipe outlet (7).

Images