Fuel cell test stand simulating position bias

Abstract

The application provides a fuel cell test bench simulating position bias, comprising a fuel cell performance detection system and a position bias simulation system, the position bias simulation system comprising a cell fixing device and a position control subsystem, the cell fixing device being electrically connected with the position control subsystem, the cell fixing device being used for installing a measured cell, and the fuel cell performance detection system being connected with the measured cell, the application combines the position bias simulation system with the fuel cell performance detection system, realizes flexible adjustment of the measured cell on a position angle in a test process, tests the running state of the cell under different angles, simulates the real working state of the cell, solves the single test state of the cell in the prior art, realizes research on the condition of the fuel cell stack when running under the working condition of a vehicle under the condition that the position of the cell is continuously changed on line, and realizes performance test of the measured cell under the full position state.

Description

Technical Field

[0001] This invention relates to the field of fuel cell stack technology applications, specifically to a fuel cell test bench that simulates positional bias. Background Technology

[0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy. Whether for industrial production or scientific research, fuel cells must be tested. During testing, the test bench needs to provide the fuel cell with reaction gases at specific pressures, temperatures, humidity, and flow rates. However, in practical applications, the placement of the same fuel cell may differ in different vehicle models, and its relative position may also change under different road conditions. Therefore, it is necessary to test the stack characteristics under different placement conditions.

[0003] During the operation of a fuel cell, a gas with a certain humidity or as a reactant needs to be introduced into the battery, while water or antifreeze is introduced as the battery coolant. Liquid water is also generated during the reaction process. The flow rate, pressure, and uniformity of distribution of all media flowing within the battery affect battery performance. 1) The uniformity of the distribution of reactant gases inside the battery directly affects battery performance; 2) Internal drainage is related to gravity and the gas flow rate of the reactants; poor drainage leading to flooding will affect battery performance; 3) Uneven distribution of the coolant will cause uneven temperature distribution within the battery, affecting battery performance. For the battery, the distribution of various media on its two rotational degrees of freedom is affected by gravity. In current fuel cell testing, the battery placement is fixed. However, in actual vehicle use, the battery placement will be adjusted according to the vehicle's layout. Furthermore, the battery's position and angle will change under uphill, downhill, and bumpy road conditions, all of which will affect battery performance.

[0004] In summary, traditional fuel cell testing methods rely on a relatively singular battery operating state and cannot simulate the different offset conditions encountered in actual vehicle use.

[0005] Patent document CN102621499A discloses a device for testing fuel cell stacks, comprising: a working gas supply system connected to the fuel cell, the working gas supply system including: a hydrogen pipeline and an air pipeline; a first flow control unit on the hydrogen pipeline for detecting and controlling the flow rate of hydrogen; a second flow control unit on the air pipeline for detecting and controlling the flow rate of air; and a control system electrically connected to the first and second flow control units respectively, the control system for collecting detection signals from the first and second flow control units to record the hydrogen flow rate in the hydrogen pipeline and the air flow rate in the air pipeline. However, this design cannot simulate testing of an on-board battery under moving conditions. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide a fuel cell test bench that simulates position offset.

[0007] A fuel cell test bench for simulating position offset provided by the present invention includes a fuel cell performance testing system and a position offset simulation system;

[0008] The position offset simulation system includes a battery fixing device and a position control subsystem;

[0009] The battery fixing device is electrically connected to the position control subsystem. The battery fixing device is used to install the battery under test and to adjust the tilt angle of the battery under test. The fuel cell performance testing system is connected to the battery under test.

[0010] Preferably, the fuel cell performance testing system includes an anode and cathode gas supply subsystem, a cooling subsystem, a humidification subsystem, a back pressure control subsystem, a load, and an electrochemical workstation;

[0011] The cathode gas and anode gas generated by the anode and cathode gas supply subsystem are connected to the battery under test after passing through the cooling subsystem and humidification subsystem in sequence. The back pressure control subsystem, the load, and the electrochemical workstation are respectively connected to the battery under test. The back pressure control subsystem is used to maintain the cathode gas and anode gas at a set pressure, and the load is used to consume the electricity generated by the battery under test.

[0012] Preferably, the position control subsystem includes a position control structure and a position calculation unit, wherein the position calculation unit is electrically connected to the position control structure.

[0013] Preferably, the position control structure includes any of the following structures:

[0014] - A robotic arm capable of performing movements with two degrees of freedom;

[0015] - Includes three or more adjustment levers.

[0016] Preferably, when the position control structure uses a robotic arm, the battery fixing device uses a clamping device to hold the battery under test, and the clamping device is mounted on the robotic arm.

[0017] Preferably, when the position control structure uses an adjusting rod, the battery fixing device uses a platform, and the platform is provided with multiple positioning holes.

[0018] Preferably, the adjusting rod can be extended or shortened by means of a fluid cylinder or a motor.

[0019] Preferably, the adjusting rod is movably engaged with the platform.

[0020] Preferably, the robotic arm achieves adjustment of two degrees of freedom through its two rotary joints.

[0021] Preferably, the clamping device includes clamping plates and connectors, and the battery under test is fixed by multiple clamping plates and connectors, wherein the clamping plates are detachably connected to the robotic arm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention combines a position offset simulation system with a fuel cell performance testing system, enabling flexible adjustment of the position angle of the battery under test during the testing process. It tests the battery's operating state at different angles, simulates the battery's real working state, and solves the problem of the single battery testing state in the prior art. It realizes the study of the fuel cell stack's operation under vehicle conditions under the condition of continuous change of battery position in online simulation, and realizes the performance testing of fuel cell stack under all position states.

[0024] 2. This invention can select different fixing devices according to the weight of the battery being tested to achieve different application scenarios. It has a flexible and practical structure and a wide range of applications.

[0025] 3. In this invention, when a robotic arm is used to fix the battery under test, various clamping devices can be used to fix different models of batteries under test, which is highly practical. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a system schematic diagram of the present invention;

[0028] Figure 2This is a schematic diagram of the structure of the fuel cell stack in this invention;

[0029] Figure 3 This is a schematic diagram of one embodiment of the position control structure.

[0030] The diagram shows:

[0031] Anode and cathode gas supply subsystem 1, load 5

[0032] Cooling Subsystem 2 Electrochemical Workstation 6

[0033] Humidification subsystem 3, robotic arm 7

[0034] Back pressure control subsystem 4 Clamping device 8 Detailed Implementation

[0035] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0036] Example 1:

[0037] This invention provides a fuel cell test bench that simulates positional bias, such as... Figures 1-3 As shown, the system includes a fuel cell performance testing system and a position offset simulation system. The position offset simulation system includes a battery fixing device and a position control subsystem. The battery fixing device is electrically connected to the position control subsystem. The battery fixing device is used to install the battery under test and to adjust the tilt angle of the battery under test. The fuel cell performance testing system is connected to the battery under test. In this invention, the battery under test is preferably a fuel cell or a fuel cell stack. The position control subsystem includes a position control structure and a position calculation unit. The position calculation unit is electrically connected to the position control structure. The position calculation unit can control the action of the position control structure to simulate the detection of the fuel cell stack at various position angles.

[0038] Specifically, in practical applications, the position control structure can adopt various structural forms, such as a robotic arm 7. The robotic arm 7 can realize two degrees of freedom of movement. When the position control structure adopts the robotic arm 7, the battery fixing device uses a clamping device 8 to hold the fuel cell stack. The clamping device 8 is installed on the robotic arm 7. In a preferred embodiment, the clamping device 8 includes a clamping plate and a connector. The fuel cell stack is clamped by multiple clamping plates and fixed by the connector. The connector can be a bolt or other structure used to achieve clamping and fastening of the clamping plates. The clamping plate is detachably connected to the robotic arm 7. For example, the robotic arm 7 realizes the adjustment of two degrees of freedom through its two rotational joints.

[0039] Furthermore, the position calculation unit can also employ a structure with adjusting rods, including three or more adjusting rods. When the position control structure uses adjusting rods, the battery fixing device uses a platform with multiple positioning holes. Since the fuel cell stack being tested is fixed, the adjusting rods can be adjusted in various ways, including by using a fluid cylinder drive, such as a pneumatic cylinder or a hydraulic cylinder. The height adjustment of the adjusting rods can also be achieved by using a motor drive, ultimately enabling the extension or retraction of the adjusting rods. During the extension or retraction of the adjusting rods, the overall position of the platform can be adjusted. The adjusting rods and the platform are movably coupled; for example, the connection between the adjusting rods and the platform is a rotatable engagement via a rotating shaft.

[0040] Furthermore, such as Figure 1 The fuel cell performance testing system includes an anode and cathode gas supply subsystem 1, a cooling subsystem 2, a humidification subsystem 3, a back pressure control subsystem 4, a load 5, and an electrochemical workstation 6. The cathode gas and anode gas generated by the anode and cathode gas supply subsystem 1 are connected to the battery under test after passing through the cooling subsystem 2 and the humidification subsystem 3 in sequence. The back pressure control subsystem 4, the load 5, and the electrochemical workstation 6 are respectively connected to the battery under test. The back pressure control subsystem 4 is used to maintain the cathode gas and anode gas at a set pressure, and the load 5 is used to consume the electricity generated by the battery under test.

[0041] The basic embodiments of this application have been described above. The following describes the application in more detail with reference to preferred embodiments and / or variations of the basic embodiments.

[0042] Example 2:

[0043] like Figure 1As shown, a fuel cell test bench simulating position offset includes a fuel cell performance testing system and a position offset simulation system. The fuel cell stack performance testing system includes an anode and cathode gas supply subsystem 1, a cooling subsystem 2, a humidification subsystem 3, a back pressure control subsystem 4, a load 5, and an electrochemical workstation 6. The anode and cathode gas supply subsystem 1 supplies a set amount of anode and cathode gas, such as oxygen for the anode and hydrogen for the cathode. The cooling subsystem 2 controls the operating temperature of the membrane electrode assembly (MEA) through a first and a second pipeline connected in parallel. The second pipeline is equipped with a cooling device, so the gas temperature is lower after passing through the second pipeline. Therefore, the gas temperature is ultimately controlled by controlling the flow rate in the first and second pipelines. The humidification subsystem 3 ensures that the anode and cathode gas reach the set humidity. The back pressure control subsystem 4 ensures that the anode and cathode gas reach the set pressure. When the pressure is too high, the valve is opened to release the pressure. The load 5 consumes the electricity generated by the battery reaction and can be connected to various electrical devices. The electrochemical workstation 6 assists in monitoring the relevant parameters of the MEA and finally obtains complete test data to form a test report.

[0044] The position offset simulation system includes a battery securing device and a position control subsystem. The battery securing device, which can be a gripping robot, is used to hold the battery in place to prevent slippage or detachment during angular offset. The position control subsystem controls the position offset angle of the fuel cell stack. Figure 2 As shown, for a fuel cell stack, the flow and distribution of its internal media only change due to gravity when the cell's position is offset by angular deviations around the X-axis and Y-axis rotational degrees of freedom. When the cell's position is offset only around the Z-axis rotational degree of freedom, it does not affect the distribution. The position control subsystem can be a robotic arm 7 capable of controlling both X-axis and Y-axis rotational degrees of freedom. It can achieve arbitrary rotation of both degrees of freedom and record the cell's angular state. The position offset simulation system can manually adjust a fixed angle for cell testing during stack testing, or dynamically change the offset angle according to a set setting to achieve cell testing under complex operating conditions.

[0045] Example 3:

[0046] A fuel cell test bench simulating position offset includes a fuel cell performance testing system and a position offset simulation system. However, its application suffers from problems such as the large weight of large fuel cell stacks, making it difficult for small robotic arms to achieve fixed clamping and angle changes. For example... Figure 3For large fuel cell stacks, the battery fixing device can be a platform with multiple positioning holes. During testing, the stack and platform can be locked together with bolts or clips to ensure that it will not slip or fall off when the angle is offset. The position control subsystem can set length-controllable lead screws in four directions of the platform. Adjusting the length of the four lead screws can achieve the stack position offset angle.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A fuel cell test bench simulating position offset, characterized in that, This includes a fuel cell performance testing system and a position offset simulation system; The position offset simulation system includes a battery fixing device and a position control subsystem; The battery fixing device is electrically connected to the position control subsystem. The battery fixing device is used to install the battery under test and to adjust the tilt angle of the battery under test. The fuel cell performance testing system is connected to the battery under test. The fuel cell performance testing system includes an anode and cathode gas supply subsystem (1), a cooling subsystem (2), a humidification subsystem (3), a back pressure control subsystem (4), a load (5), and an electrochemical workstation (6). The cathode gas and anode gas generated by the anode and cathode gas supply subsystem (1) are connected to the battery under test after passing through the cooling subsystem (2) and the humidification subsystem (3) in sequence. The cooling subsystem (2) is used to control the working temperature of the membrane electrode and includes a first pipeline and a second pipeline connected in parallel. The second pipeline is equipped with a cooling device. The gas temperature decreases after passing through the second pipeline. The gas temperature can be controlled by controlling the flow rate in the first pipeline and the second pipeline. The back pressure control subsystem (4), the load (5), and the electrochemical workstation (6) are respectively connected to the battery under test. The back pressure control subsystem (4) is used to maintain the cathode gas and anode gas at a set pressure. The load (5) is used to consume the electricity generated by the battery under test. The position control subsystem includes a position control structure and a position calculation unit, wherein the position calculation unit is electrically connected to the position control structure; the position calculation unit can control the action of the position control structure to realize the detection of the simulated fuel cell stack at various position angles; The position control structure includes any of the following structures: - Robotic arm (7), the robotic arm (7) can realize two degrees of freedom of movement, the position control subsystem can be a robotic arm (7) that can control two rotational degrees of freedom of X-axis and Y-axis and can realize arbitrary rotation of two degrees of freedom, and can record the angle state of the battery. The position offset simulation system can manually adjust the fixed angle to perform battery testing during battery testing, and can also dynamically change the offset angle according to the setting to realize battery testing under complex working conditions. The battery fixing device uses a clamping device (8) to hold the battery under test. The clamping device (8) is installed on the robotic arm (7). - Includes three or more adjusting rods, the battery fixing device adopts a platform, and the platform is provided with multiple positioning holes; The adjusting rod is movable in conjunction with the platform.

2. The fuel cell test bench with simulated position offset according to claim 1, characterized in that, The adjusting rod can be extended or shortened by means of a fluid cylinder or a motor.

3. The fuel cell test bench with simulated position offset according to claim 1, characterized in that, The robotic arm (7) achieves two degrees of freedom adjustment through its two rotational joints.

4. The fuel cell test bench with simulated position offset according to claim 1, characterized in that, The clamping device (8) includes clamping plates and connectors. The battery under test is fixed by multiple clamping plates and connectors, wherein the clamping plates are detachably connected to the robotic arm (7).

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