Method for testing sealing performance of ventilation valve of energy storage equipment

Abstract

The invention discloses a method for testing the sealing performance of a ventilation valve of energy storage equipment. According to the method, a to-be-tested vent valve is sealed to form a test cavity, compressed air is filled to establish a preset pressure difference, pressure change is detected after pressure stabilization and pressure maintaining, the sealing performance is judged in combination with a threshold value, and data is uploaded to an MES system through code scanning; the system comprises a sealing tool, a gas path system, a high-precision pressure sensor and a data processing and control unit. The defects that an existing water spraying test is low in efficiency, high in cost, subjective in result and incapable of being quantified are overcome, efficient, low-cost, objective and quantifiable detection of the sealing performance of the energy storage ventilation valve is achieved, the method is suitable for products of different sizes, nondestructive detection is achieved, data are traceable, and the method is suitable for online rapid detection of a production line.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment component testing technology, and specifically discloses a method for testing the sealing performance of a ventilation valve in an energy storage equipment based on airtightness testing. Background Technology

[0002] Energy storage devices typically contain precision components such as batteries and temperature control systems, requiring extremely high levels of airtightness in their operating environment to prevent external dust and moisture from intruding and causing equipment malfunctions. As a core component for air exchange between the inside and outside of the energy storage tank, the sealing performance of the ventilation valve directly determines whether the energy storage device meets its IP rating standards.

[0003] In existing technologies, the mainstream method for verifying the IP rating of ventilation valves is the water spray test. This method simulates an outdoor rain environment by continuously spraying the installed ventilation valve with a standard nozzle at a specific water pressure and flow rate. Subsequently, the energy storage device is visually inspected for water infiltration to determine whether the sealing performance is up to standard. However, this method has the following significant drawbacks: 1. Low testing efficiency: The standard spraying time for water spraying tests is usually several minutes to more than ten minutes. If the product fails, it needs to be reworked and retested, making the whole process time-consuming and difficult to adapt to the fast-paced requirements of the production line; 2. High testing costs: Large-scale water spraying test equipment needs to be specially built or purchased, occupying a large area of ​​space. The testing process consumes a lot of water resources, and the subsequent equipment cleaning and product drying processes add extra labor and time costs; 3. Subjective result judgment: The internal water seepage situation relies on manual visual inspection, which is easily affected by factors such as the experience and observation angle of the testers, resulting in the risk of missed judgments and misjudgments. The test results lack objectivity and accuracy, and cannot be traced later; 4. Inability to quantify the degree of leakage: Water spraying tests can only give a qualitative conclusion of "pass" or "fail", which cannot accurately quantify the leakage of the ventilation valve, which is not conducive to the optimization of production processes and the refined control of product quality.

[0004] Therefore, there is an urgent need for a high-efficiency, low-cost, objectively quantifiable, and adaptable ventilation valve sealing performance testing solution that can be adapted to products of different sizes, in order to solve the above-mentioned problems in the existing technology.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for testing the sealing performance of ventilation valves in energy storage devices, enabling rapid, low-cost, objective, and quantifiable testing of the sealing performance of ventilation valves, while being adaptable to products of different sizes, and ensuring that the testing process is non-destructive and the data is traceable, thereby overcoming the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides a method for testing the sealing performance of a ventilation valve in an energy storage device, comprising the following steps: (1) Sealed installation: Fix the ventilation valve to be tested on the sealing fixture according to the design assembly requirements, ensuring that there are no other openings in the tested area of ​​the ventilation valve, and that all gaps are reliably sealed by the sealing structure to form a closed test chamber; (2) Establish pressure difference. Dry compressed air is introduced into the test chamber through the air circuit system. The air circuit pressure is adjusted so that the pressure inside the test chamber relative to the external environment pressure reaches the preset stable value ΔP. The preset stable value ΔP is calculated based on the design protection requirements of the ventilation valve (such as IP65, IP67, etc.) and the corresponding sealing standard. The value range is 10kPa-100kPa. (3) Pressure holding and detection: When the pressure in the test chamber reaches the preset stable value ΔP, the inflation is stopped, and the test chamber enters the pressure stabilization state to ensure uniform internal pressure distribution. After the pressure stabilization lasts for 5 seconds, the pressure holding state is entered. During this process, the pressure signal in the test chamber is collected in real time using a high-precision pressure sensor and the signal is transmitted to the data processing and control unit. (4) Leakage judgment and data traceability: Within the preset pressure holding time T (the value range is 20s-60s), the data processing and control unit calculates the pressure drop value ΔP1 in the test chamber; if ΔP1 is less than or equal to the preset threshold ε, the sealing performance of the ventilation valve is deemed qualified; if ΔP1 is greater than the preset threshold ε, it is deemed unqualified; during the test, the unique identification code of the ventilation valve is scanned by the barcode scanning module, and the test time, preset parameters, pressure change curve, leakage rate, qualified status and other data are uploaded to the MES system to realize data archiving and subsequent traceability.

[0008] A system for testing the sealing performance of a ventilation valve in an energy storage device includes a sealing fixture, an air circuit system, a high-precision pressure sensor, and a data processing and control unit. The sealing fixture, serving as a carrier for the test chamber, is used to fix the ventilation valve under test and provide a reliable sealing environment. The sealing fixture includes a base, a replaceable sealing gasket, and a clamping assembly. The replaceable sealing gasket is made of aging-resistant rubber and is located at the output end of the clamping assembly. The clamping assembly is axially aligned along the Z-axis, and the base and the replaceable sealing gasket are positioned opposite each other. The ventilation valve is sealed by the replaceable sealing gasket to form the test chamber. By disassembling and replacing the replaceable sealing gasket and adjusting the clamping assembly, it can be adapted to ventilation valve products of different models and sizes. The air circuit system includes a pressure regulating valve, a switching valve, a filter pressure reducing valve, and connecting pipes. The connecting pipes are equipped with the pressure regulating valve, switching valve, and filter pressure reducing valve, and are mounted on replaceable gaskets. The connecting pipes connect to the test chamber and an external air compressor. The filter pressure reducing valve dries and filters the compressed air, removing impurities and moisture to prevent affecting test accuracy. The pressure regulating valve adjusts the charging pressure, and the switching valve controls the on / off of the air circuit, thus achieving overall pressure establishment and stable control of the test chamber. A high-precision pressure sensor is installed inside the test chamber, with a measurement accuracy of no less than ±0.1% FS and a sampling frequency of no less than 10Hz. It is used to collect pressure signals inside the test chamber in real time and convert analog signals into digital signals for transmission to the data processing and control unit. The data processing and control unit, centered on a PLC controller, also includes a touchscreen display and a barcode scanning module. The PLC controller is electrically connected to a high-precision pressure sensor, pressure regulating valve, switching valve, filter pressure reducing valve, and touchscreen display. After receiving signals from the pressure sensor, the PLC controller performs operations such as pressure holding time, leakage rate calculation, and comparison with preset thresholds (ΔP, T, ε), while simultaneously controlling the on / off state of the gas circuit system's switching valves. The touchscreen display is used to set test parameters (ΔP, T, ε), display real-time pressure data, pressure change curves, and final test results. The barcode scanning module scans the unique identifier of the ventilation valve, binding test data to the product and uploading the data to the MES system for quality control and traceability.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The testing cycle has been shortened from several minutes to more than ten minutes for water spray testing to 20-60 seconds, enabling rapid online testing on the production line. The system is also desktop-style, taking up little space and perfectly adapting to the production line cycle time. It requires no water resources, no large-scale water spraying equipment, has low equipment investment costs, and has no additional processes such as subsequent cleaning and drying, thus significantly reducing operating costs. Data is collected by high-precision sensors, and PLC automatically judges and outputs quantitative leakage rate data, completely avoiding the subjectivity and uncertainty of manual visual inspection; test data is bound to the product by scanning the code and uploaded to the MES system to realize data archiving and later traceability, which facilitates refined quality control. The entire testing process is a dry test, which does not involve water spraying and will not cause any damage or pollution to the ventilation valve, ensuring that the product can be directly put into assembly after testing. The sealing fixture is compatible with ventilation valves of different sizes through replaceable sealing gaskets; the automated testing process ensures that the conditions and judgment criteria are completely consistent for each test, and the repeatability and consistency of the test results are high. Attached Figure Description

[0010] Figure 1 This is a flowchart of the method for testing the sealing performance of the ventilation valve of the energy storage device according to the present invention; Figure 2 This is a schematic diagram of the structure of the energy storage device ventilation valve sealing performance testing system of the present invention. Detailed Implementation

[0011] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0012] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components. Example

[0013] like Figure 1 As shown, a method for testing the sealing performance of a ventilation valve in an energy storage device includes the following steps: (1) Sealed installation: The ventilation valve under test with an IP rating of IP65 is fixed on the base according to the design assembly requirements. The clamping component drives the replaceable sealing gasket to press down. The replaceable sealing gasket fits tightly with the ventilation valve to form a closed test chamber without any other openings or gaps. (2) Establish pressure difference, scan the QR code on the ventilation valve through the barcode scanning module to bind product information; set test parameters: calculate the preset stable value ΔP=50kPa based on IP65 rating, pressure holding time T=30s, preset threshold ε=2kPa; start the air circuit system, after the filter pressure reducing valve dries and filters the compressed air, the pressure regulating valve adjusts the pressure to 50kPa, and the switch valve opens to fill the test chamber with dry compressed gas until the pressure in the test chamber reaches 50kPa and stabilizes; (3) Pressure holding and detection: When the pressure in the test chamber reaches the preset stable value ΔP, the inflation is stopped, and the test chamber enters the pressure stabilization state to ensure uniform internal pressure distribution. After stabilization for 5 seconds, the pressure holding state is entered. The high-precision pressure sensor collects the pressure signal in the test chamber in real time and transmits the signal to the PLC controller every 0.05 seconds. (4) Leakage judgment and data traceability: within 30 seconds of pressure holding, the PLC controller calculates the pressure drop value ΔP1=1.2kPa. Since 1.2kPa≤2kPa, the sealing performance of the ventilation valve is deemed qualified. The PLC controller displays the pressure change curve and leakage rate of 0.04kPa / s on the touch screen. At the same time, it uploads product information, test parameters, pressure data, and qualified results to the MES system to complete the test.

[0014] like Figure 2As shown, a system for testing the sealing performance of a ventilation valve in an energy storage device includes a sealing fixture, an air circuit system, a high-precision pressure sensor, and a data processing and control unit. The sealing fixture, serving as a carrier for the test chamber, is used to fix the ventilation valve 4 under test and provide a reliable sealing environment. The sealing fixture includes a base 1, a replaceable sealing gasket 2, and a clamping assembly 3. The replaceable sealing gasket 1 is made of aging-resistant rubber. The replaceable sealing gasket 2 is located at the output end of the clamping assembly 3, which is axially arranged in the Z-axis. The base 1 and the replaceable sealing gasket 2 are arranged opposite to each other. The ventilation valve 4 is sealed by the replaceable sealing gasket 2 to form the test chamber. By disassembling and replacing the replaceable sealing gasket 2 and adjusting the clamping assembly 3, it can be adapted to ventilation valve 4 products of different models and sizes. The air circuit system includes a pressure regulating valve, a switching valve, a filter pressure reducing valve, and connecting pipes (not shown in the figure). The connecting pipes are equipped with pressure regulating valves, switching valves, and filter pressure reducing valves. The connecting pipes are mounted on replaceable gaskets and are connected to the test chamber and an external air compressor. The filter pressure reducing valve is used to dry and filter the compressed air, removing impurities and moisture to avoid affecting the detection accuracy. The pressure regulating valve is used to adjust the charging pressure, and the switching valve controls the on / off of the air circuit. Overall, the system achieves pressure establishment and stable control of the test chamber. A high-precision pressure sensor (not shown in the figure) is installed in the test chamber. The measurement accuracy is not less than ±0.1%FS and the sampling frequency is not less than 10Hz. It is used to collect the pressure signal in the test chamber in real time and convert the analog signal into a digital signal for transmission to the data processing and control unit. The data processing and control unit (not shown in the diagram) is centered around a PLC controller and also includes a touch screen and a barcode scanning module. The PLC controller is electrically connected to a high-precision pressure sensor, pressure regulating valve, switching valve, filter pressure reducing valve, and touch screen. After receiving signals from the pressure sensor, the PLC controller performs operations such as pressure holding time, leakage rate calculation, and comparison with preset thresholds (ΔP, T, ε), while simultaneously controlling the on / off state of the gas circuit system's switching valves. The touch screen is used to set test parameters (ΔP, T, ε), display real-time pressure data, pressure change curves, and final test results. The barcode scanning module is used to scan the unique identifier of the ventilation valve, binding test data to the product and uploading the data to the MES system for quality control and traceability.

[0015] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for testing the sealing performance of a ventilation valve in an energy storage device, characterized in that, The steps are as follows: (1) Sealing installation: Fix the ventilation valve to be tested on the sealing fixture according to the design assembly requirements, seal all openings in the area to be tested, and form a closed test chamber; (2) Establish pressure difference by filling the test chamber with compressed air through the air circuit system so that the pressure inside the test chamber relative to the external environment pressure reaches the preset stable value ΔP. The preset stable value ΔP is calculated based on the design requirements of the ventilation valve and the IP rating. (3) Pressure holding and detection: When the pressure in the test chamber reaches the preset stable value ΔP, the inflation is stopped, and the test chamber enters the pressure stabilization state to ensure uniform internal pressure distribution. After stabilization for 5 seconds, the pressure holding state is entered. The pressure signal in the test chamber is collected in real time using a high-precision pressure sensor. (4) Leakage judgment and data traceability: Within the preset pressure holding time T, calculate the pressure drop value ΔP1 in the test chamber; if ΔP1≤ preset threshold ε, the sealing performance of the ventilation valve is deemed qualified; if ΔP1>ε, it is deemed unqualified; during the test, a barcode scanning operation is performed to upload the test data to the MES system to realize data archiving and traceability.

2. The method for testing the sealing performance of the ventilation valve of an energy storage device according to claim 1, characterized in that: In step (2), the preset stable value ΔP is in the range of 10kPa-100kPa, and the specific value is obtained by conversion through the sealing standard corresponding to the IP level.

3. The method for testing the sealing performance of the ventilation valve of an energy storage device according to claim 1, characterized in that: In step (4), the preset pressure holding time T ranges from 20s to 60s, and the preset threshold ε is determined according to the sealing performance design requirements of the ventilation valve.

4. A system for testing the sealing performance of a ventilation valve in an energy storage device according to any one of claims 1-3, characterized in that: This includes sealing fixtures, air circuit systems, high-precision pressure sensors, and data processing and control units; The sealing fixture is used to fix the ventilation valve under test and seal it to form a closed test chamber. The sealing fixture is detachable and replaceable to adapt to ventilation valves of different sizes. The air circuit system includes a pressure regulating valve, a switching valve, a filter pressure reducing valve, and a connecting pipeline. The connecting pipeline is equipped with a pressure regulating valve, a switching valve, and a filter pressure reducing valve. The connecting pipeline is mounted on a sealing fixture. The connecting pipeline is connected to the test chamber and to an external air compressor for filling the test chamber with compressed air and controlling the chamber pressure. The high-precision pressure sensor is installed in the test chamber and is used to collect real-time pressure signals within the test chamber. The data processing and control unit includes a PLC controller and a barcode scanning module. The PLC controller is electrically connected to a high-precision pressure sensor, pressure regulating valve, switching valve, and filter pressure reducing valve. It is used to receive pressure signals, control the on / off state of the air circuit system, perform pressure holding time, calculate the leakage rate, compare with preset thresholds, and output qualified / unqualified judgment results. The barcode scanning module is used to scan the ventilation valve markings and upload the test data to the MES system.

5. The energy storage device ventilation valve sealing performance testing system according to claim 4, characterized in that: The sealing fixture includes a base, a replaceable sealing gasket, and a clamping assembly. The replaceable sealing gasket is located at the output end of the clamping assembly, which is axially aligned in the Z-axis direction. The base and the replaceable sealing gasket are positioned opposite each other. The test chamber is formed by sealing the ventilation valve with the replaceable sealing gasket, and the connecting pipeline is located on the replaceable sealing gasket. The replaceable sealing gasket is available in various specifications according to different sizes of ventilation valves.

6. The energy storage device ventilation valve sealing performance testing system according to claim 4, characterized in that: The data processing and control unit also includes a touch screen, which is electrically connected to the PLC controller and is used to set test parameters, display real-time pressure data and test results.

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