Oxidation detection device for bipolar plate

Abstract

The utility model relates to an oxidation detection device for a bipolar plate. The oxidation detection device comprises a single battery, a positive electrode liquid storage tank, a negative electrode liquid storage tank, a plurality of conduits and an electrochemical workstation, the electrochemical workstation comprises a working electrode, a reference electrode and a counter electrode, the working electrode is used for being connected with a bipolar plate to be detected, the bipolar plate to be detected is one of a positive bipolar plate and a negative bipolar plate, and the reference electrode and the counter electrode are used for being simultaneously connected with the other one of the positive bipolar plate and the negative bipolar plate; and the electrochemical workstation is configured to directly apply voltage to the positive bipolar plate and the negative bipolar plate, perform cyclic voltammetry test on the single battery, and detect the oxidation degree of the bipolar plate to be tested according to the test result. The reference electrode and the counter electrode of the electrochemical workstation are simultaneously connected with the bipolar plate to be tested, so that a three-electrode connection system of the original electrochemical workstation is simplified, the circuit complexity under the three-electrode system of the electrochemical workstation is simplified, the operation difficulty is reduced for operators, and the misoperation rate is reduced.

Description

Technical Field

[0001] This application relates to the field of flow batteries, and more specifically to an oxidation detection device for bipolar plates. Background Technology

[0002] Bipolar plates are a key component of vanadium battery stacks, primarily functioning to prevent electrolyte mixing, conduct electrons, and provide support for the stacked structure of the vanadium battery stack. Based on the type of bipolar plate material, they can currently be broadly classified into three categories: metal bipolar plates, graphite bipolar plates, and carbon-plastic composite bipolar plates. Metal bipolar plates degrade severely in acidic electrolytes; therefore, carbon-based materials are highly favored for bipolar plates used in vanadium batteries. Graphite possesses excellent electrical conductivity and chemical stability, making it the most commonly used material for manufacturing vanadium battery bipolar plates. Carbon-plastic composite materials are also ideal for manufacturing bipolar plates, typically formed by adding other conductive carbon materials and a certain amount of thermoplastic or thermosetting resin to graphite material, through extrusion molding or compression molding processes.

[0003] However, because vanadium batteries operate in a sulfuric acid environment, the graphite material in the bipolar plates oxidizes over prolonged operation. If the voltage of the vanadium battery system becomes uncontrolled, the graphite bipolar plates will be highly oxidized, potentially leading to delamination and perforation. Severe surface oxidation can cause electrolyte leakage through the bipolar plates, significantly reducing the performance of the vanadium battery and ultimately causing it to fail. Furthermore, the leaked electrolyte may further corrode the metal end plates, and the dissolved metal ions can contaminate the electrolyte, causing the entire battery system to malfunction. Therefore, understanding the oxidation voltage range of graphite bipolar plates is crucial for the efficient design of bipolar plate materials and operating conditions in vanadium battery systems, ensuring stable operation.

[0004] Currently, studies on the oxidation degree of vanadium battery bipolar plates are typically conducted in traditional three-electrode systems. In these systems, graphite bipolar plates are cut to a suitable shape to serve as the working electrode, a saturated calomel electrode or an Ag / AgCl electrode is used as the reference electrode, and a platinum or graphite electrode is generally used as the counter electrode. However, the working area of ​​the working electrode in a three-electrode system is usually small, and the entire device cannot simulate the actual structure and operating conditions of a vanadium battery stack, lacking significant reference value for vanadium battery stacks. Furthermore, the three-electrode system has multiple wires, which can easily lead to incorrect connections and erroneous experimental results in practical applications, resulting in a high rate of error. Utility Model Content

[0005] The technical problem to be solved by this application is to provide an oxidation detection device for bipolar plates that is easy to operate.

[0006] The technical solution adopted in this application to solve the above-mentioned technical problems is an oxidation detection device for bipolar plates, including a single cell, a positive electrode storage tank, a negative electrode storage tank, several conduits, and an electrochemical workstation; the positive electrode storage tank has a first electrolyte inlet and a first electrolyte outlet for containing positive electrolyte; the negative electrode storage tank has a second electrolyte inlet and a second electrolyte outlet for containing negative electrolyte; the single cell includes a positive terminal plate, a negative terminal plate, a positive bipolar plate, and a negative bipolar plate, the positive terminal plate having a positive electrolyte inlet and a positive electrolyte outlet, and the negative terminal plate having a negative electrolyte inlet and a negative electrolyte outlet, wherein the positive electrolyte inlet is connected to the first electrolyte outlet through a conduit. The system includes a positive electrolyte outlet connected to the first electrolyte inlet via a conduit, a negative electrolyte inlet connected to the second electrolyte outlet via a conduit, and a negative electrolyte outlet connected to the second electrolyte inlet via a conduit. The electrochemical workstation comprises a working electrode, a reference electrode, and a counter electrode. The working electrode is used to connect to the bipolar plate under test, which is either the positive or negative bipolar plate. The reference and counter electrodes are used to simultaneously connect to the other of the positive and negative bipolar plates. The electrochemical workstation is configured to: directly apply voltage to the positive and negative bipolar plates, perform cyclic voltammetry testing on a single cell, and detect the oxidation degree of the bipolar plate under test based on the test results.

[0007] In one embodiment of this application, the electrochemical workstation is further configured to directly apply different voltages to the positive and negative bipolar plates for different durations.

[0008] In one embodiment of this application, the single cell further includes a positive electrode frame, a separator, a negative electrode frame, and a plurality of sealing gaskets, wherein at least one sealing gasket is sandwiched between the positive electrode plate and the positive electrode bipolar plate, and at least one sealing gasket is sandwiched between the negative electrode plate and the negative electrode bipolar plate.

[0009] In one embodiment of this application, the top of the positive bipolar plate and the negative bipolar plate are respectively provided with protrusions, which are used to connect any one of the working electrode, the reference electrode and the counter electrode.

[0010] In one embodiment of this application, the oxidation detection device further includes a pump device connected to a conduit for providing power to drive the flow of the positive electrolyte and the negative electrolyte.

[0011] In one embodiment of this application, both the positive and negative bipolar plates are made of graphite.

[0012] In one embodiment of this application, both the positive and negative electrode plates are made of aluminum alloy.

[0013] In one embodiment of this application, the diaphragm is a perfluorosulfonic acid ion exchange membrane.

[0014] In one embodiment of this application, both the positive electrode frame and the negative electrode frame are made of PVC (polyvinyl chloride).

[0015] In one embodiment of this application, the sealing gasket is made of silicone.

[0016] This application simplifies the original three-electrode connection system of the electrochemical workstation by simultaneously connecting the reference electrode and the counter electrode of the electrochemical workstation to the bipolar plate under test. This simplifies the circuit complexity of the three-electrode system of the electrochemical workstation, reduces the difficulty of operation for operators, and reduces the error rate. Attached Figure Description

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of an oxidation detection device according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of an oxidation detection device according to an embodiment of this application.

[0020] Figure label:

[0021] Single cell, 110; Positive electrode plate, 111; Positive electrolyte inlet, 1111; Positive electrolyte outlet, 1112; Negative electrode plate, 112; Negative electrolyte inlet, 1121; Negative electrolyte outlet, 1122; Positive bipolar plate, 113; Protrusion, 1131; Negative bipolar plate, 114; Positive electrolyte reservoir, 120; First electrolyte inlet, 121; First electrolyte outlet, 122; Negative electrolyte reservoir, 130; Second electrolyte inlet, 131; Second electrolyte outlet, 132; Conduit, 140; Electrochemical workstation, 150; Working electrode, 151; Counter electrode, 152; Positive electrode frame, 160; Negative electrode frame, 170; Separator, 180; Sealing gasket, 190; Pump device, 101. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein, and therefore this application is not limited to the specific embodiments disclosed below.

[0024] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0025] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0027] Hereinafter, embodiments of this application will be described based on the accompanying drawings. However, the embodiments shown below are examples of an oxidation detection device for bipolar plates used to embody the technical concept of this application, and the oxidation detection device for bipolar plates in this application is not specifically defined as follows. Furthermore, in order to facilitate understanding of the scope of the claims, the components corresponding to the components shown in the embodiments are assigned numbers to the components shown in the "Claims" and "Utility Model Content" columns. However, the components shown in the claims are not intended to be specific to the components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments are not intended to limit the scope of this application unless specifically stated, but are merely illustrative examples.

[0028] like Figure 1As shown, this application provides an oxidation detection device for bipolar plates, including a single cell 110, a positive electrode storage tank 120, a negative electrode storage tank 130, several conduits 140, and an electrochemical workstation 150; the positive electrode storage tank 120 has a first electrolyte inlet 121 and a first electrolyte outlet 122 for containing positive electrolyte; the negative electrode storage tank 130 has a second electrolyte inlet 131 and a second electrolyte outlet 132 for containing negative electrolyte; the single cell 110 includes a positive end plate 111, a negative end plate 112, a positive bipolar plate 113, and a negative bipolar plate 114, the positive end plate 111 has a positive electrolyte inlet 1111 and a positive electrolyte outlet 1112, and the negative end plate 112 is provided with a negative electrolyte inlet 1121 and a negative electrolyte outlet 1122. The positive electrolyte inlet 1111 is connected to the first electrolyte outlet 122 via conduit 140, and the positive electrolyte outlet 1112 is connected to the first electrolyte inlet 121 via conduit 140. The negative electrolyte inlet 1121 is connected to the second electrolyte outlet 132 via conduit 140, and the negative electrolyte outlet 1122 is connected to the second electrolyte inlet 131 via conduit 140.

[0029] An electrochemical workstation 150 is an instrument used to control and monitor changes in the current, potential, and other electrochemical parameters of an electrochemical cell. In this application, the electrochemical workstation 150 is used to measure the degree of oxidation of the bipolar plate under test. Figure 1 As shown, the electrochemical workstation 150 includes a working electrode 151, a reference electrode (not shown), and a counter electrode 152. The working electrode 151 is used to study the electrochemical behavior of a specific substance; the reference electrode provides a stable potential reference for measuring the potential change of the working electrode 151 relative to a known potential; and the counter electrode is used to transfer electrons, forming a current loop to maintain current flow. In an embodiment of this application, the working electrode 151 is used to connect to a bipolar plate under test, which is one of a positive bipolar plate 113 and a negative bipolar plate 114. The reference electrode and counter electrode 152 are used to simultaneously connect to the other of the positive bipolar plate 113 and the negative bipolar plate 114. The electrochemical workstation 150 is configured to: directly apply voltage to the positive bipolar plate 113 and the negative bipolar plate 114; perform cyclic voltammetry testing on a single cell 110; and detect the degree of oxidation of the bipolar plate under test based on the test results.

[0030] According to the oxidation detection device of this application, the working electrode 151 of the electrochemical workstation 150 is connected to one side of the bipolar plate under test, while the reference electrode and counter electrode 152 are simultaneously connected to the other side of the bipolar plate under test, forming a two-electrode system connection. This reduces the number of wires in the electrochemical workstation 150 to two, significantly reducing practical complexity and the error rate. In the traditional three-electrode system, the working electrode 151, reference electrode, and counter electrode 152 all require wiring operations, and connection errors frequently occur, which is inconvenient for operators. In the three-electrode system, the working area of ​​the working electrode 151 is often small, around a few square centimeters. In the two-electrode system of this application, the working area of ​​the working electrode 151 can be larger, for example, 48 square centimeters. If the working area of ​​the flow battery is too small, it cannot simulate the actual structure and operating conditions of the vanadium battery stack, lacking reference value for the vanadium battery stack. The oxidation detection device of this application has a larger working area of ​​the working electrode 151, which can better simulate the actual structure and operating conditions of the vanadium battery stack, and the simulation results are of reference value.

[0031] In another embodiment of this application, the electrochemical workstation 150 is further configured to directly apply different voltages to the positive bipolar plate 113 and the negative bipolar plate 114 for different durations. By testing with different voltages at different durations, the oxidation process of the bipolar plates can be simulated.

[0032] The single cell 110 in this application is classified as a flow battery, and the preferred single cell 110 is a vanadium redox flow battery. In other embodiments, the single cell 110 may also be a flow battery containing other electrolytes.

[0033] In one embodiment of this application, the single battery 110 further includes a positive electrode frame 160, a separator 180, a negative electrode frame 170, and a plurality of sealing gaskets 190, wherein at least one sealing gasket 190 is sandwiched between the positive electrode plate 111 and the positive electrode bipolar plate 113, and at least one sealing gasket 190 is sandwiched between the negative electrode plate 112 and the negative electrode bipolar plate 114.

[0034] like Figure 1As shown, in one embodiment of this application, the positive electrode of the single cell 110, from the outside in, consists of a positive terminal plate 111, a sealing gasket 190, a positive bipolar plate 113, a sealing gasket 190, a positive electrode frame 160, a sealing gasket 190, and a separator 180; the positive terminal plate 111, the sealing gasket 190, the positive bipolar plate 113, the sealing gasket 190, the positive electrode frame 160, and the separator 180 are laminated together. This is equivalent to providing sealing gaskets between the positive terminal plate 111, the positive bipolar plate 113, the positive electrode frame 160, and the separator 180, increasing the sealing performance of the single cell. The structure of the negative electrode of the single cell 110 is centrally symmetrical with respect to the positive electrode along the separator 180, and will not be described in detail here. It should be noted that the single cell 110 of this application does not contain electrodes; therefore, the voltage provided by the electrochemical workstation 150 is directly applied to the bipolar plate, eliminating the influence of the electrodes of the single cell 110 on the detection results.

[0035] In one embodiment of this application, an opening (not shown) is provided in the middle portion of the positive electrode frame 160, the negative electrode frame 170, and the sealing gasket 190 to increase the contact area between the electrolyte and the separator 180, thereby improving the charge and discharge efficiency of the single cell 110. The single cell 110 has a positive electrolyte inlet 1111 and a positive electrolyte outlet 1112 on the positive electrode plate 111. The positive electrolyte is connected to the first electrolyte outlet 122 through the positive electrolyte inlet 1111 via a conduit 140. The electrolyte at the positive electrode of the single cell 110 can flow into the single cell 110 through the positive electrolyte inlet 1111, and flow through the openings of the positive bipolar plate 113, the positive electrode frame 160, and the sealing gasket 190 to wet the separator 180, finally flowing out through the positive electrolyte outlet 1112. Similarly, the electrolyte of the negative electrode of the single cell 110 can flow into the single cell 110 through the negative electrolyte inlet 1121, and flow through the opening of the negative electrode bipolar plate 114, the negative electrode plate 112 and the sealing gasket 190 to wet the diaphragm 180, and finally flow out through the negative electrolyte outlet 1122.

[0036] like Figure 1 As shown, in one embodiment of this application, the positive electrolyte inlet 1111 is lower than the positive electrolyte outlet 1112, and the negative electrolyte inlet 1121 is lower than the negative electrolyte outlet 1122. The end plate structures of the negative electrode and the positive electrode are symmetrically arranged along the center of the separator. In other embodiments, the structure of the single cell 110 can be of other types.

[0037] like Figure 1As shown, in one embodiment of this application, the tops of the positive bipolar plate 113 and the negative bipolar plate 114 are respectively provided with a plurality of protrusions 1131, which are used to connect any one of the working electrode 151, the reference electrode, and the counter electrode 152. The function of providing the protrusions 1131 is to provide contact points for the connection of the working electrode 151, the reference electrode, and the counter electrode 152, which helps to improve the reliability of the connection between the positive bipolar plate 113, the negative bipolar plate 114, and the electrodes.

[0038] like Figure 2 As shown, in one embodiment of this application, the oxidation detection device further includes a pump device 101, which is connected to the conduit 140 and is used to provide power to drive the flow of the positive and negative electrolytes. In some embodiments, multiple pump devices 101 may be respectively disposed at the positive electrolyte inlet 1111, the positive electrolyte outlet 1112, the negative electrolyte inlet 1121, and the negative electrolyte outlet 1122. The pump device 101 may be a peristaltic pump, a magnetic pump, or a shielded magnetic pump, etc.

[0039] In one embodiment of this application, the positive bipolar plate 113 and the negative bipolar plate 114 are made of graphite.

[0040] In one embodiment of this application, both the positive terminal plate 111 and the negative terminal plate 112 are made of aluminum alloy. In another embodiment, the materials of the positive terminal plate 111 and the negative terminal plate 112 can be graphite materials, carbon-plastic composite materials, etc.

[0041] In one embodiment of this application, the membrane 180 is a perfluorosulfonic acid ion exchange membrane. In another embodiment, the membrane 180 may also be a non-fluorine cation exchange membrane or a two-dimensional molecular sieve membrane, etc.

[0042] In one embodiment of this application, both the positive electrode frame 160 and the negative electrode frame 170 are made of PVC.

[0043] In one embodiment of this application, the sealing gasket 190 is made of silicone. In another embodiment, the sealing gasket 190 may also be made of fluororubber, nitrile rubber, etc.

[0044] The following example illustrates the use of the oxidation detection device for bipolar plates. In this example, the bipolar plate under test is the positive electrode. Therefore, the working electrode 151 of the electrochemical workstation 150 is connected to the positive bipolar plate 113 of the single cell 110. The single cell 110 is a vanadium redox flow battery, and the bipolar plate is a graphite bipolar plate. First, the oxidation detection device is installed. Through several conduits 140, the first electrolyte inlet 121 of the positive electrode storage tank 120 is connected to the positive electrolyte inlet 1111 of the positive electrode plate 111, and the first electrolyte outlet 122 of the positive electrode storage tank 120 is connected to the positive electrolyte outlet 1112 of the positive electrode plate 111. Similarly, the second electrolyte inlet 131 of the negative electrode storage tank 130 is connected to the negative electrolyte inlet 1121 of the negative electrode plate 112, and the second electrolyte outlet 132 of the negative electrode storage tank 130 is connected to the negative electrolyte outlet 1122 of the negative electrode plate 112. Pump devices 101 are respectively installed at the positive electrolyte inlet 1111 of the positive electrode plate 111 and the negative electrolyte inlet 1121 of the negative electrode plate 112, and electrolytes are added to the positive electrode storage tank 120 and the negative electrode storage tank 130 respectively. After adding electrolytes, the pump devices 101 of the positive and negative electrodes are turned on to fill the single cell 110 with electrolyte. The working electrode 151 of the electrochemical workstation 150 is connected to the protrusion 1131 of the positive electrode bipolar plate 113, and the reference electrode and the counter electrode 152 are simultaneously connected to the protrusion 1131 of the negative electrode bipolar plate 114.

[0045] After the oxidation detection device is installed, it is used for testing. The electrochemical workstation 150 is turned on, and a raw cyclic voltammetry test is initiated before the bipolar plate under test is oxidized, obtaining the raw cyclic voltammetry curve of the bipolar plate. In this example, the scan rate of the cyclic voltammetry test is 5 mV / s (millivolts per second), and the voltage range is 0-1.2 V. After obtaining the raw cyclic voltammetry curve, the test program is started, applying a voltage to the single cell 110 and maintaining it for a certain period of time. The purpose of applying and maintaining the voltage for a certain period of time in the test program is to simulate the oxidation process of the single cell 110, facilitating subsequent detection of the oxidation status of the bipolar plate. After maintaining the voltage for a certain period of time, the electrochemical workstation 150 is turned off.

[0046] After the test procedure is completed, the positive electrode electrolyte is returned to the positive electrode storage tank 120, and the negative electrode electrolyte is returned to the negative electrode storage tank 130. The connection between the single cell 110 and the positive and negative electrode storage tanks 120 and 130 is then disconnected. Next, a 0.1 M / L sulfuric acid solution is introduced into the electrolyte inlet of the positive electrode plate 111 and the electrolyte inlet of the negative electrode plate 112 to clean the single cell 110. Cleaning is complete when the sulfuric acid cleaning solution flowing from the electrolyte outlet of the positive electrode plate 111 and the electrolyte outlet of the negative electrode plate is colorless. Because the electrolyte in a vanadium redox flow battery is colored, the color of the flowing sulfuric acid cleaning solution can be used to determine whether cleaning is complete.

[0047] After cleaning, with the oxidation detection device still connected, 0.1 M / L sulfuric acid solution was introduced into the single cell 110 again, and the electrochemical workstation 150 was turned on to perform a second cyclic voltammetry test. The cyclic voltammetry curve of the positive bipolar plate 113 after oxidation was obtained. The parameters of the second cyclic voltammetry test were the same as those of the original cyclic voltammetry test. After the second cyclic voltammetry test was completed, the introduction of sulfuric acid solution into the single cell 110 was stopped, and the electrochemical workstation 150 was turned off. Finally, by comparing the original and second cyclic voltammetry curves, the degree of oxidation of the bipolar plate can be characterized, and the oxidation state can be divided into three levels: Level 1 is slight oxidation; Level 2 is significant oxidation; and Level 3 is severe oxidation. The comparison principle is based on whether new redox peaks appear in the positive bipolar plate 113 before and after oxidation, and the size of the electrochemical active area, etc.

[0048] In one embodiment of this application, the oxidation degree of the graphite bipolar plate is divided into three levels based on the observed oxidation condition. Level 1 is slight oxidation, where the bipolar plate surface shows almost no visible oxidation, but a small amount of black carbon powder is flaking off. Level 2 is significant oxidation, where the bipolar plate surface shows little oxidation, but a large amount of black carbon powder flaking off indicates significant oxidation. Level 3 is severe oxidation, where the bipolar plate surface is significantly rough or noticeably blackened. The results reflected by the secondary cyclic voltammetry curves can be directly correlated with the observed oxidation degree of the bipolar plate surface.

[0049] The oxidation detection device for bipolar plates in this application simplifies the original three-electrode connection system of the electrochemical workstation 150 by simultaneously connecting the reference electrode and counter electrode 152 of the electrochemical workstation 150 to the bipolar plate under test. This simplifies the circuit complexity of the three-electrode system of the electrochemical workstation 150, reduces the difficulty of operation for operators, and reduces the error rate.

[0050] It should be noted that, in order to simplify the description of this application and thus aid in the understanding of one or more embodiments of the utility model, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiment disclosed above.

[0051] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

Claims

1. An oxidation detection device for bipolar plates, characterized in that, It includes a single cell, a positive electrode reservoir, a negative electrode reservoir, several conduits, and an electrochemical workstation; The positive electrode storage tank has a first electrolyte inlet and a first electrolyte outlet for containing positive electrode electrolyte. The negative electrode storage tank has a second electrolyte inlet and a second electrolyte outlet for containing negative electrode electrolyte; The single battery includes a positive terminal plate, a negative terminal plate, a positive bipolar plate, and a negative bipolar plate. The positive terminal plate has a positive electrolyte inlet and a positive electrolyte outlet. The negative terminal plate has a negative electrolyte inlet and a negative electrolyte outlet. The positive electrolyte inlet is connected to the first electrolyte outlet via a conduit, the positive electrolyte outlet is connected to the first electrolyte inlet via a conduit, the negative electrolyte inlet is connected to the second electrolyte outlet via a conduit, and the negative electrolyte outlet is connected to the second electrolyte inlet via a conduit. The electrochemical workstation includes a working electrode, a reference electrode, and a counter electrode. The working electrode is used to connect to the bipolar plate under test, which is one of the positive and negative bipolar plates. The reference electrode and the counter electrode are used to connect to the other of the positive and negative bipolar plates simultaneously. The electrochemical workstation is configured to: directly apply voltage to the positive and negative bipolar plates, perform cyclic voltammetry testing on the single cell, and detect the degree of oxidation of the bipolar plate under test based on the test results.

2. The oxidation detection device as described in claim 1, characterized in that, The electrochemical workstation is also configured to directly apply different voltages to the positive and negative bipolar plates for different durations.

3. The oxidation detection device as described in claim 1, characterized in that, The single battery also includes a positive electrode frame, a separator, a negative electrode frame, and several sealing gaskets, with at least one sealing gasket sandwiched between the positive electrode plate and the positive electrode bipolar plate, and at least one sealing gasket sandwiched between the negative electrode plate and the negative electrode bipolar plate.

4. The oxidation detection device as described in claim 1, characterized in that, The top of the positive bipolar plate and the negative bipolar plate are respectively provided with protrusions, which are used to connect any one of the working electrode, the reference electrode and the counter electrode.

5. The oxidation detection device as described in claim 1, characterized in that, It also includes a pump device connected to the conduit for providing power to drive the flow of electrolyte at the positive electrode and electrolyte at the negative electrode.

6. The oxidation detection device according to any one of claims 1-5, characterized in that, Both the positive and negative bipolar plates are made of graphite.

7. The oxidation detection device according to any one of claims 1-5, characterized in that, Both the positive and negative electrode plates are made of aluminum alloy.

8. The oxidation detection device as described in claim 3, characterized in that, The diaphragm is a perfluorosulfonic acid ion exchange membrane.

9. The oxidation detection device as described in claim 3, characterized in that, Both the positive electrode frame and the negative electrode frame are made of PVC.

10. The oxidation detection device as described in claim 3, characterized in that, The sealing gasket is made of silicone.

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