A seawater fuel cell discharge service performance test method

Abstract

The present application relates to a kind of seawater fuel cell discharge service performance test method.The present application includes the following steps, first step to determine the variable that needs to be simulated and construct the test device that can reflect above-mentioned variable, second step is to place seawater fuel cell in test device, adjust water hole parameter to meet the requirement and make seawater fuel cell enter discharge working state, third step is to collect the electric parameter of seawater fuel cell under discharge service condition and evaluate its discharge performance.In the present application, first construct the working condition environment consistent with real application scene, then place fuel cell in above-mentioned working condition environment and make it discharge, collect the discharge information of seawater fuel cell, i.e.can collect its relevant discharge data when used in underwater submersible, to ensure the environmental adaptability of seawater fuel cell under the joint action of multiple factors, and verify the correctness of theory and technical feasibility of seawater fuel cell used in underwater equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrical performance testing devices, in particular to a seawater fuel cell discharge service performance device. BACKGROUND

[0002] The seawater fuel cell is an electrochemical device that directly uses seawater to convert the chemical energy of magnesium or aluminum into electrical energy. It uses magnesium or aluminum as the negative electrode material and seawater as the electrolyte. Its most prominent feature is that it does not need to carry additional electrolyte, and it has the advantages of high energy density, good safety, and full-sea-depth work. It has good application prospects in the fields of underwater vehicles, deep-sea landers, and deep-sea in-situ experimental stations.

[0003] The discharge performance of the seawater fuel cell is closely related to the service conditions in which it is used. The temperature, salinity, and flow rate of seawater can significantly affect the discharge performance of the battery. The marine environment in which underwater equipment is used is complex and variable, and the hydrological characteristics such as seawater temperature and salinity differ greatly in different sea areas. This results in large differences in the inlet and outlet flow rates and flow rates of the seawater fuel cell, making the electrochemical performance of the seawater fuel cell under actual service conditions extremely complex.

[0004] Underwater equipment used in complex marine environments requires the seawater fuel cell to meet various discharge service performance requirements in specific application scenarios. Therefore, a method is needed to test the discharge performance of the seawater fuel cell under specific service conditions to ensure the environmental adaptability of the seawater fuel cell under the combined action of multiple factors and to verify the theoretical correctness and technical feasibility of the seawater fuel cell for underwater equipment. SUMMARY

[0005] The purpose of the present application is to provide a seawater fuel cell discharge service performance testing method that can verify the theoretical correctness of the seawater fuel cell for underwater equipment.

[0006] To achieve the above-mentioned purpose, the seawater fuel cell discharge service performance testing method of the present application adopts the following technical solution:

[0007] A seawater fuel cell discharge service performance testing method, comprising the following steps: first, determining the actual working condition variables that need to be simulated and constructing a seawater fuel cell discharge service performance testing device that can truly simulate the actual service conditions of the seawater fuel cell when used in underwater vehicles;

[0008] The constructed seawater fuel cell discharge service performance testing device comprises a simulation water tunnel, a water tunnel electrical control unit and a data acquisition control system, the simulation water tunnel comprises an integrated working section in which an experimental body is placed for experiment and a water pump for driving water flow; the water tunnel electrical control unit is used for realizing real-time monitoring and control of relevant physical quantities in the simulation water tunnel; the data acquisition control system comprises a battery signal detection element and a controller, the water tunnel electrical control unit and the battery signal detection element are electrically connected with the controller, and the battery signal detection element comprises a voltmeter for measuring discharge voltage of the seawater fuel cell to be tested, an ammeter for measuring discharge current, a power meter for measuring discharge power, a timer for measuring activation time, a thermometer for measuring cell temperature and a resistograph for measuring internal resistance of the battery;

[0009] In the second step, the seawater fuel cell to be tested is placed in the integrated working section, the water tunnel parameters are adjusted through the controller and the water tunnel electrical control unit, and the seawater fuel cell is brought into a discharge working state;

[0010] In the third step, relevant signals in the discharge process of the seawater fuel cell are collected through the battery signal detection element.

[0011] Further, in the first step, the actual working condition variables to be simulated include temperature, salinity, water level, pressure of seawater around the underwater vehicle shell, flow velocity of seawater, the water tunnel electrical control unit comprises water tunnel parameter detection elements and execution elements, the water tunnel parameter detection elements comprise a temperature sensor for detecting water flow temperature, a velocity sensor for detecting incoming flow velocity, a pressure sensor for detecting water pressure, a salinity meter for detecting salinity and a liquid level meter for detecting liquid level, and the execution elements are connected to the output end of the controller to perform controlled actions so as to adjust water flow temperature, incoming flow velocity, pressure, salinity and liquid level in the experimental section, and the execution elements comprise a refrigerator, a heat exchanger, a water tunnel water pump, a pressure regulating pump, a vacuum pump, a salt adding valve and a solenoid valve.

[0012] Further, the seawater fuel cell discharge service performance testing device comprises a load power loading system, the load power loading system comprises a mechanical power loading module, the mechanical power loading module comprises a working motor and a loading motor driven to work by the working motor, and in the second step, the working motor is powered by the seawater fuel cell to simulate entering a discharge working state.

[0013] Further, the data acquisition control system comprises a mechanical load signal detection element, which comprises a rotating speed sensor for measuring the rotating speed of the working motor, a torque sensor for measuring the loading torque of the loading motor and a power meter for measuring the loading power of the loading motor, the mechanical load signal detection element is electrically connected to the controller to transmit the acquired relevant signals to the controller, the mechanical power loading module further comprises a working motor controller and a loading motor driver, the working motor is connected to the output end of the working motor controller, the loading motor is connected to the output end of the loading motor driver, and the working motor controller and the loading motor driver are connected to different output ports of the controller to control the controlled operation of the working motor and the loading motor.

[0014] Further, the load power loading system further comprises an electronic power loading module, which comprises an electronic load, and the electronic load is electrically connected to the seawater fuel cell to be powered by the seawater fuel cell.

[0015] Further, the electronic load is a programmable direct-current electronic load, and the data acquisition control system further comprises an electronic load signal detection element, which comprises a voltage meter for detecting the loading voltage, a current meter for detecting the loading current and a power meter for detecting the online power, the electronic load signal detection element is electrically connected to the controller to transmit the acquired relevant signals to the controller, and the programmable direct-current electronic load is connected to another output port of the controller to generate a controlled load.

[0016] Further, the data acquisition control system comprises a data acquisition card, which is connected to the input port of the controller to transmit the acquired signals to the controller, and the water tunnel parameter detection element, the mechanical load signal detection element, the electronic load signal detection element and the battery signal detection element are connected to different input ports of the data acquisition card to transmit the acquired relevant signals to the data acquisition card.

[0017] Further, the controller comprises an industrial control host and a PLC controller, and the PLC controller performs bidirectional signal transmission with the industrial control host.

[0018] Further, the integrated working section is provided with a test body, the integrated working section is a cylindrical section with a uniform inner diameter, the test body comprises a head fairing section, an experimental section and a tail section in sequence from front to back, the front end and the rear end of the integrated working section both exceed the test body, the head fairing section and the integrated working section form a contraction section with gradually decreasing flow area, the experimental section and the integrated working section form a narrow annular channel, and the tail section and the integrated working section form an expansion section with gradually increasing flow area.

[0019] Further, the water tunnel electrical control unit comprises a control element, the control element comprises a frequency converter, a temperature controller and a pressure controller, the water pump and the pressure regulating pump are connected to the output port of the frequency converter to move under control, the refrigerator and the heat exchanger are connected to the output port of the temperature controller to operate under control, the vacuum pump is connected to the output port of the pressure controller to operate under control, and the frequency converter, the temperature controller and the pressure controller are connected to different output ports of the controller to receive control instructions for controlling the actions of the corresponding execution elements.

[0020] The beneficial effects of the present application are as follows: the present application provides a high-coming-flow-speed environment by simulating a water tunnel to simulate the working condition of a high-speed underwater vehicle. The water tunnel electrical control unit measures the water flow temperature, coming flow speed, pressure, salinity and liquid level in the water tunnel in real time and transmits them to the data acquisition control system, and then controls the execution elements to execute corresponding actions to adjust the parameters in the water tunnel under control according to the instructions issued by the data acquisition control system. The seawater fuel cell to be tested is placed in the experimental section to simulate the actual service working condition of the seawater fuel cell used in the underwater vehicle. The discharge voltage, discharge current, discharge power, activation time, cell temperature and internal resistance of the seawater fuel cell to be tested are measured by the battery signal detection element, so that the relevant discharge data of the seawater fuel cell used in the underwater vehicle can be collected, and theoretical support can be provided for the actual application of the seawater fuel cell in the underwater vehicle.

[0021] Further, the seawater fuel cell discharge service performance testing device applies an electronic power load to the seawater fuel cell through the electronic power loading module to simulate the power characteristics of the resistive load of the electrical instruments and equipment carried by the underwater vehicle under different use conditions.

[0022] Further, the seawater fuel cell discharge service performance testing device applies a mechanical power load to the seawater fuel cell through the mechanical power loading module to simulate the load power characteristics of the DC working motor (inductive load) carried by the underwater vehicle during the forward navigation process of overcoming water resistance through the propeller under different use conditions. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Flowchart of an embodiment of a seawater fuel cell discharge service performance testing method of the present application;

[0024] Figure 2 In Figure 1 Structure block diagram of a seawater fuel cell discharge service performance testing device constructed in the present application;

[0025] Figure 3 Is Figure 2 Structure schematic diagram of a seawater fuel cell discharge service performance testing device in the present application;

[0026] Figure 4 IsFigure 3 Structure diagram of mechanical power loading module;

[0027] Figure 5 Figure 2 Structure diagram of data acquisition control system;

[0028] Figure 6 Figure 2 Structure diagram of water tunnel electrical control unit;

[0029] Figure 7 Figure 3 Structure diagram of simulated water tunnel;

[0030] Figure 8 Figure 7 Partial enlarged diagram of A in the embodiment; DETAILED DESCRIPTION

[0031] Embodiment of a seawater fuel cell discharge service performance test method of the present application:

[0032] The specific process of a seawater fuel cell discharge service performance test method is shown in Figure 1 , including the following steps,

[0033] First, confirm the actual working condition variables that need to be simulated and construct a seawater fuel cell discharge service performance test device that can truly simulate the actual service working conditions of seawater fuel cells used in underwater vehicles according to the actual working condition variables;

[0034] In this step, the actual working conditions to be simulated include the hydrological characteristics of seawater temperature, salinity, water level, and the flow field characteristics of the pressure and flow rate of seawater around the underwater vehicle hull. In fact, to truly simulate the actual service working conditions of seawater fuel cells used in underwater vehicles, at least the following three aspects need to be simulated: one is the hydrological characteristics of seawater including temperature, salinity, and water level; two is the flow rate, flow, and flow channel scouring caused by the design of the battery compartment section flow channel of the underwater vehicle; three is the hull heat dissipation cooling. However, for a specific underwater vehicle, its hydrodynamic shape and battery compartment section internal flow channel design are determined, and the speed of the underwater vehicle will affect the change of the flow field characteristics (including flow direction and flow rate) of the surrounding seawater.

[0035] Second, place the seawater fuel cell to be tested in the integrated working section 14, adjust the water tunnel parameters through the controller 45 and the water tunnel electrical control unit 200, and make the seawater fuel cell enter the discharge working state.

[0036] ​​​​In this step, the seawater fuel cell to be tested is used to power the mechanical power loading module 32 to simulate the load power characteristics of the DC working motor (inductive load) carried by the underwater vehicle during forward movement against water resistance through the propeller; the seawater fuel cell to be tested is used to power the electronic power loading module 31 to simulate the power characteristics of the resistive load of the electrical equipment carried by the underwater vehicle under different use conditions. Through the simulation of inductive load and resistive load, the actual use condition of the underwater vehicle is more realistically simulated, so that the performance test result of the seawater fuel cell is more accurate.

[0037] In the third step, the battery signal detection element 41 collects the relevant signals during the discharge process of the seawater fuel cell.

[0038] The battery signal detection element 41 is used to collect the discharge voltage, discharge current, discharge power, activation time, cell temperature and internal resistance of the seawater fuel cell.

[0039] In the third step, the discharge performance of the seawater fuel cell can also be evaluated according to the collected signals of the battery signal detection element. When evaluating, the corresponding threshold values of the corresponding parameters under each performance level can be defined by referring to the national standard or industry standard of ordinary fuel cells.

[0040] The structure of a seawater fuel cell discharge service performance test device constructed in the first step is shown in Figures 2 to 8 The structure of a seawater fuel cell discharge service performance test device constructed in the first step is shown in

[0041] The simulation water tunnel 100 comprises a water pump 11, a first auxiliary expansion section 12, an auxiliary contraction section 13, an integrated working section 14 and a second auxiliary expansion section 15 connected in series through pipes, each bend of the pipes is connected by an elbow pipe 16, and a guide vane 17 is arranged in the elbow pipe 16 to smooth the flow field. The guide vane 17 at each elbow pipe 16 comprises a plurality of groups of vane units, and the outer contour camber line of the elbow pipe 16, the plurality of vane units and the inner contour camber line of the elbow pipe 16 form a group of concentric circles with diameters decreasing in sequence. The water pump 11 provides power for the water tunnel, and the first auxiliary expansion section 12, the auxiliary contraction section 13 and the second auxiliary expansion section 15 are used to compensate for the difference between the inner diameter of the integrated working section 14 and the inner diameter of the water pump 11. The simulation water tunnel 100 further comprises a turbulence body 500 concentrically arranged in the integrated working section 14.

[0042] The first auxiliary expansion section 12 is in the shape of a truncated cone, the auxiliary contraction section 13 is in the shape of a thin-walled pipe, the inner diameter of the outlet end of the first auxiliary expansion section 12 is the same as the inner diameter of the inlet end of the auxiliary contraction section 13, and therefore the diameter of the connecting pipe section between the first auxiliary expansion section 12 and the auxiliary contraction section 13 is the same at any cross section. The integrated working section 14 is a cylindrical pipe section with a uniform diameter, and the front end of the integrated working section 14 is inserted into the auxiliary contraction section 13. The diameter of the connecting pipe section between the integrated working section 14 and the inlet end of the second auxiliary expansion section 15 is the same at any cross section.

[0043] The turbulence body 500 is arranged in the integrated working section 14 and comprises a head fairing section 51, an experimental section 52 and a tail section 53 in sequence from front to back. The head fairing section 51, the experimental section 52 and the tail section 53 are arranged concentrically, the experimental section 52 is a cylindrical section with a uniform diameter, the diameter of any cross section of the experimental section 52, the diameter of the rear end of the head fairing section 51 and the diameter of the front end of the tail section 53 are the same, and the generatrix of the conical surface forming the outer contour of the tail section 53 converges at the last end to form a cone top.

[0044] The turbulence body 500 is concentrically arranged in the middle of the integrated working section 14, and the front end and the rear end of the integrated working section 14 both extend beyond the turbulence body 500. Therefore, the inlet of the integrated working section 14 is a cylindrical section, the head fairing section 51 and the inner wall of the tunnel section form a contraction section with gradually decreasing flow area to increase the pressure and speed of the flow field, and then the outer wall of the experimental section 52 and the inner wall of the tunnel section form a narrow annular flow channel to obtain a stable high-speed flow field, and finally the tail section 53 and the inner wall of the tunnel section form a conical surface with gradually increasing flow area to diffuse the flow field and recover energy. The seawater fuel cell to be tested is arranged in the experimental section 52, and therefore the stable high-speed flow field obtained in the narrow annular flow channel formed by the outer wall of the experimental section 52 and the inner wall of the tunnel section can meet the testing requirements of the discharge service performance of the seawater fuel cell.

[0045] Three groups of arc-shaped strips (not shown in the figure) are evenly arranged on the outer circumferential surface of the experimental section 52 in the circumferential direction, and the size of the strips is consistent with the size of the integrated working section 14 so that the spoiler 500 can be just placed in the integrated working section 14. A stop piece (not shown in the figure) is fixed on the inner circumferential surface of the integrated working section 14, and the stop piece is located behind the strips to stop the spoiler 500 from moving backward under the impact of the backward water flow.

[0046] In this embodiment, the spoiler 500 is actually an experimental underwater vehicle, and the structure of the underwater vehicle is optimized so that it can be used as the spoiler 500 and meet the requirements of the experimental body. The outer contour line equation of the head fairing section 51 is , the length of the head fairing section 51 is 560 mm, the front end radius is 0, and the rear end radius is 162 mm. The outer contour line equation of the experimental section 52 is , the length of the experimental section 52 is 940 mm, and the radius is 162 mm. The radius of the front end of the tail section 53 is 162 mm, the radius of the rear end is 0, the length is 920 mm, and the fitting equation of the outer contour line is . Among them, the axial direction of the spoiler 500 is taken as the X axis, the radial direction of the spoiler 500 is taken as the Y axis, and the most front end of the spoiler 500 is taken as the coordinate origin to establish a reference coordinate system, x is the horizontal axis coordinate in the parameter coordinate system, and y is the vertical axis coordinate in the reference coordinate system. It can be seen that the maximum outer diameter of the spoiler 500 is 324 mm, and the inner diameter of the integrated working section 14 is 350 mm.

[0047] The computational fluid dynamics software ANSYS is used to simulate the integrated working section 14 after the above-mentioned spoiler 500 is placed in the water tunnel (i.e. under the condition that the maximum diameter of the experimental body is 324 mm and the inner diameter of the integrated working section 14 is 350 mm). The inlet flow rate is set to 4.5 m / s, and the environmental pressure is set to 2 atm.

[0048] The simulation results show that for a cylindrical experimental body with a diameter of 324 mm, if the inner diameter of the integrated working section 14 is 350 mm, a stable high flow rate of 32 m / s can be obtained in the annular flow passage section corresponding to the experimental section 52 at the inlet flow rate of 4.5 m / s, and the flow passage thickness is 13 mm. There are local high-pressure and low-pressure areas at the head fairing section 51 and the tail section 53, and there is a flow separation phenomenon, but no vortex is generated, and the entire experimental section flow field is stable. The experimental body can be placed in the integrated working section 14 to simulate the high-speed navigation condition of the underwater vehicle in water.

[0049] The water tunnel electric control unit 200 comprises water tunnel parameter detection elements, execution elements and control elements. The water tunnel parameter detection elements comprise a temperature sensor 21 for detecting the temperature of water flow in the narrow annular flow passage of the water tunnel, a speed sensor 22 for detecting the incoming flow speed, a pressure sensor 23 for detecting the water pressure at a certain height, a salinity meter 24 for detecting the salinity, and a liquid level meter 25 for detecting the liquid level. The execution elements comprise a refrigerator 26, a heat exchanger 27, a water pump 11, a pressure regulating pump 29, a vacuum pump 210, a salt adding valve 211, and a solenoid valve 212. The control elements comprise a frequency converter 213, a temperature controller 214, and a pressure controller 215. The water pump 11 and the pressure regulating pump 29 in the water tunnel 100 are respectively connected to the output ports of the two groups of frequency converters 213 for controlled movement. The refrigerator 26 and the heat exchanger 27 are connected to the output ports of the temperature controller 214 for controlled operation. The vacuum pump 210 is connected to the output port of the pressure controller 215 for controlled operation. The frequency converter 213, the temperature controller 214, and the pressure controller 215 are connected to different output ports of the controller 45 to receive control instructions for controlling the actions of the corresponding execution elements.

[0050] The salt adding valve 211 is installed at the opening of the salt storage tank at the lower end, and the opening of the salt storage tank is connected to the water tunnel 100 through a pipeline. When the salt adding valve 211 is opened, the salt content in the water tunnel 100 can be increased. The pressure regulating pump 29 is connected to the water inlet of the pressure regulating tank. High-pressure water is pumped into the pressure regulating tank through the pressure regulating pump 29. The water outlet in the pressure regulating tank is connected to the water tunnel 100. The water pressure in the pressure regulating tank is used to increase the water pressure in the water tunnel 100. The suction port of the vacuum pump 210 is connected to the water tunnel 100 to extract the gas in the water tunnel 100 and optimize the flow field quality.

[0051] There are two solenoid valves 110, which are installed at the water inlet and water outlet positions of the water tunnel 100, respectively. When the corresponding solenoid valve 110 is opened, the water supplement function into the water tunnel 100 and the water discharge function from the water tunnel can be realized, so as to ensure that the liquid level in the water tunnel 100 meets the set requirements.

[0052] Each control element corresponds to an independent control of a required actual simulation quantity in the water tunnel 100, so that the water tunnel electric control unit 200 has higher integration and requires fewer interfaces connected to the data acquisition and control system 400.

[0053] The load power loading system 300 comprises an electronic power loading module 31 and a mechanical power loading module 32. The electronic power loading module 31 comprises a programmable DC electronic load 311 and a matching measurement and control software 312. The programmable DC electronic load 311 can simulate the power characteristics of an electrical load and output in constant voltage, constant current, constant resistance, constant power and programmed modes, so as to evaluate the power following performance of the seawater fuel cell to the resistance and capacitance load. The programmable DC electronic load 311 capable of simulating the power characteristics of an electrical load in the prior art is the prior art, and the matching measurement and control software 312 is also the prior art, which will not be described in detail in the present application.

[0054] The mechanical power loading module 32 comprises a working motor 321, a working motor controller 322, a servo loading motor 323, a loading motor driver 324, a coupling 325, a torque sensor 326 and a platform 327. The platform 327 is the installation base of other components. The working motor 321 and the working motor controller 322 are the power unit, which is provided with a direct current power input by the seawater fuel cell to be tested; the servo loading motor 323 and the loading motor driver 324 are the load unit, which is connected with 220V alternating current mains. The working motor 321 is connected to the output port of the working motor controller 322 to move under control, and the servo loading motor 323 is connected to the output port of the loading motor driver 324 to generate a controlled load.

[0055] The working motor 321 and the servo loading motor 323 are connected through the coupling 325 and the torque sensor 326 to form a towing system. The servo loading motor 323 has a torque mode, in which it can run according to a specific output torque characteristic curve according to the set value, so as to realize stable loading of the working motor 321 according to the predetermined rule. The output torque of the servo loading motor 323 is adjusted by a torque simulation voltage signal, which is sent by the industrial host computer 451 through the analog output end of the data acquisition card 44 or the PLC controller 452, and the loading motor driver 324 executes the control instruction.

[0056] The data acquisition control system 400 is used for measuring the discharge parameters of the seawater fuel cell, for controlling the operating parameters and load power of the simulated water tunnel 100, and for measuring the power loading parameters of the loading system 300, and includes a cell signal detection element 41, an electronic load signal detection element 42, a mechanical load signal detection element 43, a data acquisition card 44, a controller 45, and a data acquisition control program 46. The cell signal detection element 41 includes a voltmeter 411 for measuring the discharge voltage of the seawater fuel cell, a current meter 412 for measuring the discharge current, a power meter 413 for measuring the discharge power, a timer 414 for measuring the activation time, a thermometer 415 for measuring the temperature of the cell, and a resistometer 416 for measuring the internal resistance of the cell. The electronic load signal detection element 42 includes a load voltage meter 421 for measuring the load voltage, a load current meter 422 for measuring the load current, and a load power meter 423 for measuring the load power. The mechanical load signal detection element 43 includes a tachometer 431 for measuring the rotational speed of the AC servo loading motor 323, a torque meter 432 for measuring the loading torque of the AC servo loading motor 323, and a power meter 433 for measuring the loading power of the AC servo loading motor 323.

[0057] The cell signal detection element 41 and the water tunnel parameter detection element are connected to the input port of the data acquisition card 44. The controller includes an industrial control host computer 451 and a PLC controller 452, which transmits signals to the industrial control host computer 451 to bidirectionally transmit information. The data acquisition card 44 is connected to an input port of the industrial control host computer 451, and each detection element converts the corresponding physical quantity measured in digital form into an analog voltage quantity. The data acquisition card 44 acquires the above-mentioned analog voltage quantity and transmits it to the industrial control host computer 451. The data acquisition control program 46 is integrated in the PLC controller 452, which continuously transmits the acquired signals to the PLC controller 452 through the industrial control host computer 451. The data acquisition control program 46 in the PLC controller 452 compares the acquired value with the target value and generates the next control instruction. The control instruction for controlling the simulated water tunnel 101 is output in digital form by the PLC controller 452 to the water tunnel electrical control unit 200. In other embodiments, the control instruction for controlling the simulated water tunnel 101 can also be output in digital form by the data acquisition card 44 to the water tunnel electrical control unit 200.

[0058] The rotation speed, torque and power signals of the direct current working motor 321 in the mechanical power loading module 32 are both measurement signals and control signals. The electronic load signal detection element 42 and the mechanical load signal detection element 43 interact with the industrial host computer 451 in the form of virtual serial port communication to realize the transmission of collected signals. The programmable direct current electronic load 311, the working motor controller 322 and the loading motor driver 324 also interact with the industrial host computer 451 in the form of virtual serial port communication to realize the transmission of control signals.

[0059] Of course, in other embodiments, the battery signal detection element 41 and the water tunnel parameter detection element can both be wireless sensors. After measuring the corresponding physical quantities, the wireless sensors can wirelessly transmit the measurement data to the industrial host computer 451 through virtual serial ports.

[0060] The industrial host computer 451 is stable in performance and can continuously run for a long time to store data in the seawater fuel cell discharge service performance test process, thereby providing a basis for the study of experimental results in the later stage.

[0061] Although the present application has been described in detail in the foregoing description, it is to be understood that modifications and improvements can be made to the present application without departing from the spirit of the present application. Therefore, such modifications and improvements are to be included in the scope of the present application.

Claims

1. A method for testing the discharge service performance of a seawater fuel cell, characterized in that, The process includes the following steps: First, determine the actual operating condition variables that need to be simulated and construct a seawater fuel cell discharge service performance test device that can realistically simulate the actual service conditions of seawater fuel cells when used in underwater vehicles. The constructed seawater fuel cell discharge service performance testing device includes a simulated water tunnel, a water tunnel electrical control unit, and a data acquisition and control system. The simulated water tunnel includes an integrated working section for placing the experimental subject within it for testing and a water pump for driving water flow. The water tunnel electrical control unit is used to realize real-time monitoring and control of relevant physical quantities in the simulated water tunnel. The data acquisition and control system includes battery signal detection elements and a controller. Both the water tunnel electrical control unit and the battery signal detection elements are electrically connected to the controller. The battery signal detection elements include a voltmeter for measuring the discharge voltage of the seawater fuel cell under test, a galvanometer for measuring the discharge current, a power meter for measuring the discharge power, a timer for measuring the activation time, a thermometer for measuring the cell temperature, and a resistor for measuring the battery internal resistance. The second step is to place the seawater fuel cell to be tested in the integrated working section, and adjust the water tunnel parameters through the controller and the water tunnel electrical control unit to bring the seawater fuel cell into the discharge working state. The third step involves acquiring relevant signals during the discharge process of the seawater fuel cell using battery signal detection elements. In the first step, the actual operating conditions to be simulated include seawater temperature, salinity, water level, and the pressure and flow velocity of the seawater surrounding the underwater vehicle hull. The water tunnel electrical control unit includes water tunnel parameter detection elements and actuators. The water tunnel parameter detection elements include a temperature sensor for detecting water flow temperature, a velocity sensor for detecting incoming flow velocity, a pressure sensor for detecting water pressure, a salinity meter for detecting salinity, and a level gauge for detecting liquid level. The actuators are connected to the output of the controller to perform controlled actions to adjust the water flow temperature, incoming flow velocity, pressure, salinity, and liquid level within the experimental section. The actuators include a cooler, a heat exchanger, a water tunnel pump, a pressure regulating pump, a vacuum pump, a salt addition valve, and a solenoid valve. Furthermore, the seawater fuel cell discharge service performance testing device includes a load power loading system, which includes a mechanical power loading module. The mechanical power loading module includes a working motor and a loading motor driven by the working motor. In the second step, the working motor is powered by the seawater fuel cell to simulate its discharge operation.

2. The method for testing the discharge service performance of a seawater fuel cell according to claim 1, characterized in that: The data acquisition and control system includes a mechanical load signal detection element, which includes a speed sensor for measuring the speed of the working motor, a torque sensor for measuring the load torque of the loading motor, and a power meter for measuring the load power of the loading motor. The mechanical load signal detection element is electrically connected to the controller to transmit the relevant acquired signals to it. The mechanical power loading module also includes a working motor controller and a loading motor driver. The working motor is connected to the output terminal of the working motor controller, and the loading motor is connected to the output terminal of the loading motor driver. The working motor controller and the loading motor driver are connected to different output ports of the controller to control the operation of the working motor and the loading motor.

3. The method for testing the discharge service performance of a seawater fuel cell according to claim 2, characterized in that: The load power loading system further includes an electronic power loading module, which includes an electronic load that is electrically connected to the seawater fuel cell for being powered by it.

4. The method for testing the discharge service performance of a seawater fuel cell according to claim 3, characterized in that: The electronic load is a programmable DC electronic load. The data acquisition and control system further includes an electronic load signal detection element, which includes a voltmeter for detecting the applied voltage, a galvanometer for detecting the applied current, and a power meter for detecting the online power. The electronic load signal detection element is electrically connected to the controller to transmit the relevant acquired signals to it. The programmable DC electronic load is connected to another output port of the controller to generate a controlled load.

5. The method for testing the discharge service performance of a seawater fuel cell according to claim 4, characterized in that: The data acquisition and control system includes a data acquisition card, which is connected to the input port of the controller to transmit the acquired signals to it. The water tunnel parameter detection element, mechanical load signal detection element, electronic load signal detection element, and battery signal detection element are connected to different input ports of the data acquisition card to transmit the acquired relevant signals to it.

6. A method for testing the discharge service performance of a seawater fuel cell according to any one of claims 1 to 5, characterized in that: The controller includes an industrial control host and a PLC controller, and the PLC controller and the industrial control host transmit signals bidirectionally.

7. A method for testing the discharge service performance of a seawater fuel cell according to any one of claims 1 to 5, characterized in that: The integrated working section contains a test body, which is a cylindrical section with a uniform inner diameter. The test body includes a head fairing section, an experimental section, and a tail cone section from front to back. The front and rear ends of the integrated working section extend beyond the test body. A contraction section with a gradually decreasing flow area is formed between the head fairing section and the integrated working section, a narrow annular channel is formed between the experimental section and the integrated working section, and an expansion section with a gradually increasing flow area is formed between the tail cone section and the integrated working section.

8. The method for testing the discharge service performance of a seawater fuel cell according to claim 7, characterized in that: The water tunnel electrical control unit includes control elements, including a frequency converter, a temperature controller, and a pressure controller. A water pump and a pressure regulating pump are connected to the output port of the frequency converter for controlled movement. A refrigerator and a heat exchanger are connected to the output port of the temperature controller for controlled operation. A vacuum pump is connected to the output port of the pressure controller for controlled operation. The frequency converter, temperature controller, and pressure controller are connected to different output ports of the controller to receive control commands for controlling the actions of the corresponding actuators.

Images