Single-chamber high-temperature fuel cell in-situ Raman spectrum testing device

Abstract

The invention discloses an in-situ Raman spectrum testing device for a single-chamber high-temperature fuel cell. The in-situ Raman spectrum testing device comprises a cell body, a sample platform, an electrode plate, a binding post, a sapphire window plate and a cell cover, a test cavity is formed in the cell body, the sample platform is detachably arranged in the test cavity, a battery storage groove is formed in the sample platform, and the electrode plates are electrically connected with the battery and the binding post respectively; a heating base located at the bottom of the sample platform is further arranged in the pool body, a heating cavity for a heating assembly to enter is formed in the heating base, an air inlet and an air outlet which are communicated with the testing cavity are further formed in the pool body, and the air outlet is connected with negative pressure equipment. According to the device, in-situ Raman spectrum testing can be carried out in the reaction process of the high-temperature hydrogen / oxygen fuel cell, and compared with an existing device which can only carry out testing at the first stage and the last stage, the device can more completely and comprehensively realize cell reaction monitoring. Meanwhile, the whole device is compact in structure, and the size of the device is compressed to meet the conventional Raman spectrum test height requirement.

Description

Technical Field

[0001] The present invention relates to the field of battery testing, and more particularly, to an in-situ Raman spectroscopy testing device for a single-chamber high-temperature fuel cell. Background Art

[0002] A single-chamber fuel cell is a type of fuel cell that typically consists of a single reaction chamber in which hydrogen oxidation / oxygen reduction reactions occur to generate electrical energy. A single-chamber fuel cell is different from a traditional double-chamber fuel cell, which requires two separated chambers for supplying hydrogen and oxygen or air respectively. In a single-chamber fuel cell, a single reactant gas (such as hydrogen, oxygen, or air) usually undergoes a half-reaction test in a single reaction chamber, and a solid electrolyte is commonly used to separate the two electrodes of the battery.

[0003] In-situ Raman spectroscopy monitoring of the changes in substances on the electrode surface and real-time analysis of gas products are mainly based on the principle of Raman spectroscopy technology. By monitoring the molecular vibration characteristics on the electrode surface, the changes in surface substances and the generation of gas products during the electrochemical reaction can be analyzed in real time. In an electrochemical reaction, the substances on the electrode surface often undergo chemical reactions, adsorption, or desorption and other changes. These changes will cause changes in the internal vibration modes of the molecules, thereby affecting the characteristic peaks of the Raman spectrum. For example, in the hydrogen oxidation reaction (HOR) or oxygen reduction reaction (ORR), there may be changes in adsorption on the electrode surface, or different chemical species may be generated. By monitoring these Raman spectrum changes in real time, the dynamic changes of the substances on the electrode surface can be intuitively captured.

[0004] In existing fuel cell devices, the hydrogen / oxygen (unipolar) fuel cell device that meets the high-temperature reaction conditions is only developed for the battery to react, and does not consider the requirements for Raman spectroscopy testing. Due to limited conditions, traditional Raman spectroscopy testing methods can only be characterized at the beginning and end stages of the battery reaction, that is, pre-reaction characterization and post-reaction characterization, and nothing is known about the changes during the reaction process. Moreover, existing in-situ Raman spectroscopy testing instruments have strict requirements on the size of the in-situ cell and the distance between the cell and the test lens, and existing fuel cell devices cannot meet these requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide an in-situ Raman spectroscopy testing device for a single-chamber high-temperature fuel cell to solve the technical problems existing in the above background art.

[0006] The technical solution of the present invention provides an in-situ Raman spectroscopy testing device for a single-chamber high-temperature fuel cell, including a cell body, a sample platform, electrode plates, connection terminals, sapphire window plates, and a cell cover;

[0007] A test cavity is provided inside the cell body. The sample platform is detachably arranged inside the test cavity. A battery storage groove is arranged on the sample platform. The electrode plates are electrically connected to the battery and the connection terminals respectively.

[0008] A heating base is further provided inside the cell body at the bottom of the sample platform. A heating cavity for inserting a heating component is arranged on the heating base. An air inlet and an air outlet communicating with the test cavity are further arranged on the cell body. The air outlet is connected to a negative pressure device.

[0009] An observation port is arranged on the cell cover. The sapphire window pane is arranged opposite to the battery storage groove. The cell cover is hermetically connected to the cell body.

[0010] In a preferred embodiment, four electrode plate storage grooves are arranged on the outer periphery of the battery storage groove. The four electrode plate storage grooves are distributed in a cross shape. The four electrode plates are respectively located in the four electrode plate storage grooves. The four electrode plates are evenly distributed on the upper and lower sides of the battery, and the two electrode plates on the same side are arranged opposite to each other.

[0011] In a preferred embodiment, the electrode plate is connected to the sample platform by screws, and the electrode plate is connected to the connection terminal by platinum wires.

[0012] In a preferred embodiment, the connection terminal is made of copper, and an insulating sheet is arranged between the connection terminal and the cell body.

[0013] In a preferred embodiment, a sealing ring is arranged between the cell cover and the cell body. Mounting groove body one and mounting groove body two are respectively arranged on the cell cover and the cell body. The upper and lower sides of the sealing ring are respectively located in mounting groove body one and mounting groove body two. The sapphire window pane is located between the sealing ring and the cell cover.

[0014] In a preferred embodiment, the distance between the sapphire window pane and the upper end face of the battery is 5-6 mm.

[0015] In a preferred embodiment, water cooling channels are arranged on both the cell body and the cell cover and outside the sealing ring.

[0016] In a preferred embodiment, a temperature measurement cavity for inserting a thermocouple is further arranged on one side of the heating cavity.

[0017] The beneficial effects of the technical solution of the present invention are:

[0018] This device can perform in-situ Raman spectroscopy testing during the reaction process of high-temperature hydrogen / oxygen fuel cells. Compared with existing devices that can only be tested at the beginning and end stages, this device can more comprehensively and completely monitor the battery reaction. At the same time, the overall structure of the device is compact, and the device size is compressed to meet the height requirements of conventional Raman spectroscopy testing. By setting up a heating structure and a water-cooling mechanism, while meeting the reaction temperature requirements, the effective cooling of the sealing ring can be achieved, protecting the sealing ring from deforming under high-temperature conditions, and thus ensuring the sealing of the test cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention,

[0020] Figure 2 is an exploded view of the structure of the present invention,

[0021] Figure 3 is another exploded view of the structure of the present invention,

[0022] Figure 4 is a schematic diagram of the installation of the battery and the electrode plate of the present invention on the sample platform.

[0023] Description of the reference numerals: 1 cell body, 2 sample platform, 3 electrode plate, 4 terminal, 5 sapphire window, 6 cell cover, 7 test cavity, 8 battery storage groove, 9 electrode plate storage groove, 10 heating base, 11 heating cavity, 12 temperature measurement cavity, 13 air inlet, 14 air outlet, 15 sealing ring, 16 mounting groove 1, 17 mounting groove 2, 18 insulating sheet, 19 water-cooling channel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The embodiments of the present invention are given for the convenience of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0025] As Figures 1-4As shown in the figure, the technical solution of the present invention provides a single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device, which includes a cell body 1, a sample platform 2, electrode plates 3, terminal posts 4, sapphire window plates 5 and a cell cover 6. A test cavity 7 is arranged inside the cell body 1, the sample platform 2 is detachably arranged inside the test cavity 7, a battery storage groove 8 is arranged on the sample platform 2, and the electrode plates 3 are electrically connected to the battery and the terminal posts 4 respectively. An observation port is arranged on the cell cover 6, the sapphire window plate 5 is arranged opposite to the battery storage groove 8, and when testing, the cell cover 6 is hermetically connected to the cell body 1.

[0026] In the above solution, the sample platform 2 is a ceramic sample platform 2. First, it is installed inside the test cavity 7 by screws, then the battery is placed into the battery storage groove 8 and locked by the electrode plates 3. The electrode plates 3 are platinum plates. Then, the electrode plates 3 are connected to the terminal posts 4, and the terminal posts 4 are externally connected to power supply devices. During testing, the terminal posts 4, the electrode plates 3 and the battery are electrically connected. After wiring is completed, the cell cover 6 equipped with the sapphire window plate 5 is covered on the cell body 1 and hermetically connected, thus completing the sealing installation and power connection work of the battery.

[0027] Based on the above solution, in order to ensure that the test device has the reaction conditions of a high-temperature fuel cell, usually the reaction temperature is about 500 °C. A heating base 10 is also arranged inside the cell body 1 at the bottom of the sample platform 2, and a heating cavity 11 for inserting a heating component is arranged on the heating base 10. The heating component can be a heating rod or other structures. Two heating cavities 11 are arranged, and two heating rods can be inserted to ensure heating uniformity and improve heating efficiency. The heating base 10 is located inside the test cavity 7, thereby indirectly heating the test cavity 7 to meet the reaction temperature requirement. At the same time, the setting of the test cavity 7 can effectively reduce heat loss and better achieve heat preservation. A temperature measurement cavity 12 for inserting a thermocouple is also arranged on one side of the heating cavity 11 to monitor the temperature, and thus better control the temperature.

[0028] An air inlet 13 and an air outlet 14 communicating with the test cavity 7 are also arranged on the cell body 1. During testing, corresponding gases are introduced for testing. For example, when performing a hydrogen electrode (negative electrode) test, the observation surface where the hydrogen electrode is located faces the sapphire window plate 5. When testing, hydrogen is introduced, and the hydrogen will react on the end surface where the hydrogen electrode is located. At the same time, the Raman light passes through the sapphire window plate 5 and irradiates this end surface, and then the change of the end surface is judged through the feedback Raman signal. Similarly, when performing an oxygen electrode test (positive electrode), oxygen is introduced through the air inlet 13. The air outlet 14 is connected to a negative pressure device, and the gas in the test cavity 7 can also be pumped out and introduced into a mass spectrometer for collaborative analysis. The items that can be monitored by this device include the chemical states of electrode surface intermediates (such as *H, *OOH, etc.) during reaction processes such as oxygen reduction reaction and hydrogen oxidation reaction.

[0029] Four electrode sheet storage grooves 9 are arranged on the outer periphery of the battery storage groove 8. The four electrode sheet storage grooves 9 are distributed in a cross shape. The four electrode sheets 3 are respectively located in the four electrode sheet storage grooves 9. The four electrode sheets 3 are evenly distributed on the upper and lower sides of the battery, and the two electrode sheets 3 on the same side are arranged oppositely.

[0030] The above distribution method of the electrode sheet 3 can reduce the influence of the internal resistance of the battery on the test. The electrode sheet 3 is connected to the sample platform 2 by screws, and the electrode sheet 3 is connected to the terminal 4 by a platinum wire. The terminal 4 is made of copper (gold-plated), and an insulating sheet 18 is arranged between the terminal 4 and the cell body 1. During installation, first install the electrode sheet 3 at the bottom of the battery into the corresponding electrode sheet storage groove 9, then place the battery into the battery storage groove 8, and then install the other two electrode sheets 3 above the battery to realize the crimping and fixing of the battery, while ensuring a tight connection with the battery to ensure the conductive effect.

[0031] A sealing ring 15 is arranged between the cell cover 6 and the cell body 1. An installation groove body one 16 and an installation groove body two 17 are respectively arranged on the cell cover 6 and the cell body 1. The upper and lower sides of the sealing ring 15 are respectively located in the installation groove body one 16 and the installation groove body two 17. The sapphire window pane 5 is located between the sealing ring 15 and the cell cover 6. During installation, first install the sapphire window pane 5 on the cell cover 6, then place the sealing ring 15 into the installation groove body two 17, then cover the cell cover 6 on the cell body 1 and make the upper part of the sealing ring 15 located in the installation groove body one 16, and then fix the cell cover 6 and the cell body 1 by bolts. The above settings ensure a sealed connection between the cell cover 6 and the cell body 1, and at the same time, the cell cover 6 is easy to disassemble. After installation, the distance between the sapphire window pane 5 and the upper end face of the battery is 5-6 mm. Generally, the long focal length of the Raman spectroscopy test lens is about 8 mm, and setting the distance at 5-6 mm can achieve effective monitoring.

[0032] Water cooling channels 19 are arranged on the cell body 1 and the cell cover 6 and outside the sealing ring 15. During the heating reaction process, because the reaction temperature is relatively high, and the sealing ring 15 usually cannot withstand a high temperature of 500 °C, by circulating water flow through the water cooling channels 19, the cell body 1 and the cell cover 6 can be cooled, thereby realizing the cooling of the sealing ring 15 and avoiding the high-temperature deformation of the sealing ring 15, resulting in sealing failure.

[0033] This device can perform in-situ Raman spectroscopy testing during the reaction process of high-temperature hydrogen / oxygen fuel cells. Compared with existing devices that can only be tested at the beginning and end stages, this device can more comprehensively and completely monitor the battery reaction. At the same time, the entire device structure is compact, and the device size is compressed to meet the height requirements of conventional Raman spectroscopy testing. By setting up a heating structure and a water cooling mechanism, while meeting the reaction temperature requirements, the effective cooling of the sealing ring 15 can be achieved, protecting the sealing ring 15 from deforming under high-temperature conditions, and thus ensuring the sealing performance of the test cavity 7.

[0034] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art unless otherwise specified and limited.

Claims

1. A single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device, characterized in that: It includes a cell body, a sample platform, electrode plates, connection terminals, a sapphire window and a cell cover; A test cavity is arranged in the cell body, the sample platform is detachably arranged in the test cavity, a battery storage groove is arranged on the sample platform, and the electrode plates are electrically connected to the battery and the connection terminals respectively; A heating base located at the bottom of the sample platform is further arranged in the cell body, a heating cavity for inserting a heating component is arranged on the heating base, an air inlet and an air outlet communicated with the test cavity are further arranged on the cell body, and the air outlet is connected to a negative pressure device; An observation port is arranged on the cell cover, the sapphire window is arranged opposite to the battery storage groove, and the cell cover is hermetically connected to the cell body.

2. The in-situ Raman spectroscopy test device for a single-chamber high-temperature fuel cell according to claim 1, characterized in that: Four electrode plate storage grooves are arranged on the outer periphery of the battery storage groove, the four electrode plate storage grooves are distributed in a cross shape, the four electrode plates are respectively located in the four electrode plate storage grooves, the four electrode plates are evenly distributed on the upper and lower sides of the battery, and the two electrode plates on the same side are arranged opposite to each other.

3. The in-situ Raman spectroscopy test device for a single-chamber high-temperature fuel cell according to claim 1, wherein: The electrode plate is connected to the sample platform by screws, and the electrode plate is connected to the connection terminal by platinum wires.

4. A single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device according to claim 1, characterized in that: The connection terminal is made of copper, and an insulating sheet is arranged between the connection terminal and the cell body.

5. A single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device according to claim 1, characterized in that: A sealing ring is arranged between the cell cover and the cell body, mounting groove body one and mounting groove body two are respectively arranged on the cell cover and the cell body, the upper and lower sides of the sealing ring are respectively located in mounting groove body one and mounting groove body two, and the sapphire window is located between the sealing ring and the cell cover.

6. A single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device according to claim 1, characterized in that: The distance between the sapphire window and the upper end face of the battery is 5-6 mm.

7. The in-situ Raman spectroscopy test device for a single-chamber high-temperature fuel cell according to claim 1, characterized in that: Water cooling channels are arranged on the cell body and the cell cover and outside the sealing ring.

8. A single-chamber high-temperature fuel cell in-situ Raman spectroscopy test device according to claim 1, characterized in that: A temperature measuring cavity for inserting a thermocouple is further arranged on one side of the heating cavity.

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