A multi-mode arc draw testing device

Abstract

The application discloses a multi-mode arc drawing test device, which comprises a main control module, a test container, a dust sample gas path module and a vacuum extraction pipe connected to the inner cavity of the test container. The inner cavity of the test container is provided with an electrode module and an arc drawing detection module. The electrode module, the arc drawing detection module and the dust sample gas path module are electrically connected to the main control module. The electrode module comprises two electrodes arranged in the inner cavity of the test container for forming an arc and a closed-loop servo motor electrically connected to the two electrodes. The closed-loop servo motor adjusts the distance between the two electrodes under the control of the main control module. The application is used for arc analysis and test of medium breakdown characteristics under the thermal runaway scene of lithium batteries. The dynamic medium environment is simulated through the dust sample gas path module. The transient characteristics of the medium breakdown process are accurately captured through the electrode module with adjustable distance and the arc drawing detection module, so that high-precision and high-safety test of the arc drawing characteristics of lithium batteries under complex working conditions is realized.

Description

Technical Field

[0001] This invention relates to the field of testing device technology, and in particular to a multi-mode arc testing device. Background Technology

[0002] In new energy vehicles and energy storage systems, when lithium batteries experience thermal runaway, wear and tear on valves and insulation often leads to sudden changes in medium temperature or pressure, which can potentially trigger arc discharge. Arc analysis testing equipment is used to simulate the dielectric breakdown characteristics under lithium battery thermal runaway scenarios.

[0003] Existing testing equipment cannot simultaneously simulate dynamic changes in the medium and accurately detect dielectric breakdown characteristics, and its safety is insufficient. Traditional arc testing often only supports static closed environments. For example, the Chinese invention disclosed in publication number CN119535135A discloses an arc testing system for energy storage PCS, in which the positive arc interface, negative arc interface, and battery arc interface are all fixed, making it impossible to adjust the distance between the electrodes or simulate open airflow scenarios (such as dust blowing). While some existing testing devices can adjust the distance between the electrodes, the adjustment accuracy of the electrode spacing is low, mostly greater than 1mm, thus lacking a closed-loop calibration mechanism, which easily leads to large test errors.

[0004] Therefore, there is an urgent need for an arc testing device that can simultaneously simulate static and dynamic dielectric environments and accurately detect the breakdown characteristics of dielectrics under dynamic changes. Summary of the Invention

[0005] This invention proposes a multi-mode arc testing device to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multi-mode arc testing device includes a main control module, a test container, a dust sample inlet gas path module and a vacuum tube communicating with the inner cavity of the test container. The inner cavity of the test container is provided with an electrode module and an arc detection module. The electrode module, the arc detection module and the dust sample inlet gas path module are all electrically connected to the main control module. The electrode module includes two electrodes disposed in the inner cavity of the test container for forming an arc and a closed-loop servo motor electrically connected to the two electrodes. The closed-loop servo motor adjusts the distance between the two electrodes under the control of the main control module.

[0007] Preferably, the test container is a spherical container or a cylindrical container.

[0008] Preferably, the test container is a pressure-resistant container with a working pressure exceeding 2 MPa.

[0009] Preferably, the test container is equipped with a safety valve, a rupture disc, and a temperature / pressure interlock safety lock.

[0010] Preferably, the test container is equipped with a stirrer.

[0011] Preferably, the dust sampling gas path module includes a gas sampling pipeline equipped with a gas sampling ratio control valve and connected to the test container. The gas sampling ratio control valve is electrically connected to the main control module. The gas sampling pipeline includes at least three individual gas sampling pipes and one purge inlet pipe. The individual gas sampling pipes are used to discharge a single gas or dust into the inner cavity of the test container. The purge inlet pipe is used to connect to an external gas source to discharge a mixture of gas and dust into the inner cavity of the test container.

[0012] Preferably, the system also includes a liquid injection module connected to the inner cavity of the test container. The liquid injection module includes a liquid sample cell, a liquid injection line, a liquid nozzle, and a liquid injection control valve. The liquid injection line connects the liquid sample cell and the test container. The liquid nozzle is located at the outlet end of the liquid injection line and is situated within the inner cavity of the test container. The liquid injection control valve is located on the liquid injection line and is electrically connected to the main control module. Preferably, the arc detection module includes a temperature detection module for detecting the temperature inside the test container and a dynamic pressure detection module for testing the pressure inside the container, wherein the temperature detection module and the dynamic pressure detection module are electrically connected to the main control module.

[0013] Preferably, the test container is equipped with a container lid for opening the test container.

[0014] Preferably, the main control module communicates with the remote server via wired or wireless transmission.

[0015] Compared with existing technologies, this invention is used for arcing analysis and testing of dielectric breakdown characteristics in lithium battery thermal runaway scenarios. It simulates a dynamic dielectric environment through a dust sample introduction gas path module, and uses an electrode module with precisely adjustable distance in conjunction with an arcing detection module to accurately capture the transient characteristics of the dielectric breakdown process, thereby achieving high-precision and high-safety testing of arcing characteristics of lithium batteries under complex operating conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-mode arc testing device according to the present invention; Figure 2 This is a side view of the multi-mode arc testing device of the present invention. Figure 3 This is a schematic cross-sectional view of a multi-mode arc testing device according to the present invention; Figure 4 This is a structural block diagram of a multi-mode arc testing device according to the present invention.

[0017] In the diagram, 1-Main control module, 2-Test container, 3-Dust injection gas path module, 4-Liquid injection module, 5-Electrode module, 6-Container lid, 7-Temperature detection module, 8-Dynamic pressure detection module, 9-Remote server, 10-Stirrer, 11-Workbench, 31-Gas injection pipeline, 32-Gas injection proportional control valve, 51-Electrode, 52-Closed-loop servo motor, 100-Stirrer, 102-Stirring motor. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0019] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0020] like Figure 1 As shown, a multi-mode arc testing device includes a main control module 1, a test container 2, a dust sample inlet gas path module 3 connected to the inner cavity of the test container 2, and a vacuum tube. The inner cavity of the test container 2 is provided with an electrode module 5 and an arc detection module. The electrode module 5, the arc detection module, and the dust sample inlet gas path module 3 are all electrically connected to the main control module 1. The electrode module 5 includes two electrodes 51 disposed in the inner cavity of the test container 2 for forming an arc and a closed-loop servo motor 52 electrically connected to the two electrodes 51. The closed-loop servo motor precisely adjusts the distance between the two electrodes under the control of the main control module.

[0021] The test container 2 can be a pressure-resistant container with a working pressure exceeding 2MPa, and can be a spherical or cylindrical container, generally made of 316L stainless steel for corrosion resistance. A container lid 6 is connected to the top of the test container 2 for opening it. The electrode module 5 is used to simulate the arc discharge of a lithium battery. The test container 2 is connected to a pressure relief port; the lid can only be opened after the temperature is ≤40℃ following pressure relief to prevent residual risks.

[0022] The dust sampling gas path module can be installed on one side of the test container 2. It includes a gas sampling pipeline equipped with a gas sampling proportioning control valve and connected to the test container. The gas sampling proportioning control valve is electrically connected to the main control module. The gas sampling pipeline includes at least three individual gas sampling pipes and one purge inlet pipe. The individual gas sampling pipes are used to discharge a single gas or dust into the inner cavity of the test container. The purge inlet pipe is used to connect to an external gas source and discharge a mixture of gas and dust into the inner cavity of the test container. The at least three individual gas sampling pipes may include at least one combustible gas sampling pipe, at least one combustion oxidizer sampling pipe, and at least one inerting agent sampling pipe, respectively used for the sampling control of combustible gas, combustion oxidizer, and inerting agent. Each sampling pipe may be equipped with an inlet pressure detection sensor, which is electrically connected to the main control module 1 and used to detect the inlet pressure of the inlet pipeline.

[0023] A stirrer 10 may be provided inside the test container 2 to ensure uniform mixing of gas and dust within the test container 2. The stirrer 10 may include a stirring motor 102, a rotating shaft, and a stir bar 100. One end of the rotating shaft is fixedly connected to the stir bar, and the other end is fixedly connected to the stirring motor. The stir bar is located on the inner side opposite to the location of the electrode 51 inside the test container 2.

[0024] To ensure safety, the test container 2 may be equipped with one or more safety devices, such as a safety valve, a rupture disc, and a temperature / pressure interlock safety lock. Any one of these devices can be installed, or multiple devices can be installed simultaneously to form multiple layers of safety protection, effectively ensuring the safety of experimental personnel.

[0025] Optionally, the present invention may include a liquid sample introduction module 3 for introducing liquid samples into the test container 2. This module includes a liquid sample pool, a liquid sample introduction pipeline, a liquid nozzle, and a liquid sample introduction control valve. The liquid sample introduction pipeline connects the liquid sample pool and the test container 2. The liquid nozzle is located at the outlet end of the liquid sample introduction pipeline and is situated within the inner cavity 2 of the test container. The liquid sample introduction control valve is located on the liquid sample introduction pipeline and is electrically connected to the main control module 1. The liquid sample introduction pipeline may be equipped with a liquid pressurization chamber or similar structure to facilitate the use of high-speed airflow to spray the liquid to be tested into the test container 2, forming a liquid mist through the liquid nozzle.

[0026] The arc detection module includes a temperature detection module 7 and a dynamic pressure detection module 8, which are respectively connected to the main control module 1. The temperature detection module 7 detects the temperature inside the test container 2, and the dynamic pressure detection module 8 detects the dynamic pressure inside the container 2, transmitting the detected temperature and dynamic pressure data to the main control module 1. The temperature detection module 7 monitors the temperature inside the test container 2 to ensure that the liquid is fully vaporized or the liquid-gas mixture detonates at a certain temperature. The dynamic pressure detection module 8 is installed on the inner wall of the test container 2 and can sensitively detect changes in explosion pressure.

[0027] The test container 2 can be placed on the workbench 11, and the liquid injection pipeline and gas injection pipeline 31, etc., can be stored inside the workbench 11. The bottom of the workbench 11 can be equipped with several casters to move the position of the workbench 11.

[0028] The main control module 1 receives the detection data from each detection element and analyzes the explosion pressure data. The main control module 1 communicates with the remote server 9 via wired or wireless transmission, and can transmit the detection data to the remote server 9 for remote analysis, calculation, and storage.

[0029] This invention can employ both dynamic and static modes for testing: Static mode: Precise gas mixing is performed in a sealed test container 2, such as three-way automatic sample injection. Atmosphere stabilization is achieved through stirring and settling. Voltage is applied to detect the electric arc. Specifically, the process is as follows: evacuate to 10 kPa → inject electrolyte vapor (target partial pressure 5 kPa) → fill with air to 100 kPa → stir for 3 min → settling for 3 min, adjust the electrode spacing to 1.3-1.8 mm → apply a constant voltage of 800 V → capture the discharge waveform using an oscilloscope. Dynamic mode: In an open system, an external air source is used to purge airflow to simulate a dust / aerosol environment and monitor arcing characteristics in real time. Specifically, purge airflow is initiated (proportional valve opening 40%) → dust (30-50μm) is injected → arcing is monitored in real time.

[0030] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims of this application.

[0031] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A multi-mode arc testing device, characterized in that, The system includes a main control module, a test container, a dust sample inlet gas path module connected to the inner cavity of the test container, and a vacuum tube. The inner cavity of the test container is equipped with an electrode module and an arc detection module. The electrode module, the arc detection module, and the dust sample inlet gas path module are all electrically connected to the main control module. The electrode module includes two electrodes disposed in the inner cavity of the test container for forming an arc and a closed-loop servo motor electrically connected to the two electrodes. The closed-loop servo motor adjusts the distance between the two electrodes under the control of the main control module.

2. The multi-mode arc testing device according to claim 1, characterized in that, The test container is a spherical container or a cylindrical container.

3. The multi-mode arc testing device according to claim 1, characterized in that, The test container is a pressure-resistant container with a working pressure exceeding 2 MPa.

4. The multi-mode arc testing device according to claim 1, characterized in that, The test container is equipped with a safety valve, a rupture disc, and a temperature / pressure interlock safety lock.

5. The multi-mode arc testing device according to claim 1, characterized in that, The test container is equipped with a stirrer.

6. The multi-mode arc testing device according to claim 1, characterized in that, The dust sampling gas path module includes a gas sampling pipeline equipped with a gas sampling ratio control valve and connected to the test container. The gas sampling ratio control valve is electrically connected to the main control module. The gas sampling pipeline includes at least three individual gas sampling pipes and one purge gas inlet pipe. The individual gas sampling pipes are used to discharge a single gas or dust into the inner cavity of the test container. The purge gas inlet pipe is used to connect to an external gas source to discharge a mixture of gas and dust into the inner cavity of the test container.

7. The multi-mode arc testing device according to claim 1, characterized in that, It also includes a liquid injection module that connects to the inner cavity of the test container. The liquid injection module includes a liquid sample cell, a liquid injection line, a liquid nozzle, and a liquid injection control valve. The liquid injection line connects the liquid sample cell and the test container. The liquid nozzle is located at the outlet end of the liquid injection line and is located in the inner cavity of the test container. The liquid injection control valve is located on the liquid injection line and is electrically connected to the main control module.

8. A multi-mode arc testing device according to any one of claims 1 to 7, characterized in that, The arc detection module includes a temperature detection module for detecting the temperature inside the test container and a dynamic pressure detection module for testing the pressure inside the container. The temperature detection module and the dynamic pressure detection module are electrically connected to the main control module.

9. A multi-mode arc testing device according to claim 8, characterized in that, The test container is equipped with a lid for opening.

10. A multi-mode arc testing device according to claim 8, characterized in that, The main control module communicates with the remote server via wired or wireless transmission.

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