Electrochemical reaction tank

Abstract

The electrochemical reaction tank comprises a base and a top cover, and the base is provided with a first light hole penetrating in the thickness direction of the electrochemical reaction tank; the top cover and the base are connected with each other and are oppositely arranged, the top cover is provided with a second light-transmitting hole penetrating in the thickness direction, and infrared crystals are arranged in the first light-transmitting hole and the second light-transmitting hole; the base and the top cover are used for clamping the working electrode pole piece, the separator and the counter electrode pole piece therebetween, the working electrode pole piece is provided with a first through hole, the counter electrode pole piece is provided with a second through hole, and the first light-transmitting hole, the first through hole, the second through hole and the second light-transmitting hole are oppositely arranged along the thickness direction. According to the electrochemical reaction tank provided by the embodiment of the invention, the detection accuracy and the detection efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to an electrochemical reaction cell. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. When designing and manufacturing batteries, it is often necessary to test the electrodes and electrolytes in the battery using an electrochemical reaction cell.

[0003] The design of electrochemical reaction cells must take into account multiple design factors. For example, how to improve the accuracy and efficiency of detection and experimentation is an important research direction in this field. Utility Model Content

[0004] This application provides an electrochemical reaction cell that can improve the accuracy and efficiency of detection.

[0005] In a first aspect, this application provides an electrochemical reaction cell, including a base and a top cover. The base is provided with a first light-transmitting hole that extends through the thickness direction of the electrochemical reaction cell. The top cover is connected to the base and disposed opposite to it. The top cover is provided with a second light-transmitting hole that extends through the thickness direction. Both the first light-transmitting hole and the second light-transmitting hole are provided with infrared crystals. The base and the top cover are used to sandwich a working electrode, an isolator, and a counter electrode between them. The working electrode is provided with a first through hole, and the counter electrode is provided with a second through hole. The first light-transmitting hole, the first through hole, the second through hole, and the second light-transmitting hole are all disposed opposite to each other along the thickness direction.

[0006] In the technical solution of this application embodiment, the electrochemical reaction cell includes a top cover and a base that interlock with each other. A working electrode, a separator, and a counter electrode to be tested can be sandwiched between the two. The base and top cover are respectively provided with a first light-transmitting hole and a second light-transmitting hole, and the working electrode and counter electrode are respectively provided with a first through hole and a second through hole, with the aforementioned four holes facing each other. When using this electrochemical reaction cell, infrared light can pass through the first light-transmitting hole, the second light-transmitting hole, the first through hole, and the second through hole. Therefore, based on the ability to conduct corresponding experiments, both the working electrode and the counter electrode are set as sheets with a certain area, further simulating the internal environment of the battery and improving the accuracy of the experiment. Simultaneously, the working electrode and the counter electrode can be directly used after cutting the positive and negative electrodes from the battery, making them easy to obtain and thus improving detection efficiency.

[0007] According to some embodiments of this application, in the thickness direction, the cross-sectional area of ​​both the first and second light-transmitting holes increases in a direction away from each other. This expands the space for light to enter and exit on both sides, facilitating the adjustment of the infrared light path.

[0008] According to some embodiments of this application, the first light-transmitting hole includes a first aperture segment and a second aperture segment arranged sequentially and interconnected along the direction near the top cover. The cross-sectional area of ​​the first aperture segment is larger than that of the second aperture segment, and the infrared crystal is disposed in the second aperture segment. The second light-transmitting hole includes a third aperture segment and a fourth aperture segment arranged and interconnected along the direction away from the base. The cross-sectional area of ​​the fourth aperture segment is larger than that of the third aperture segment, and the infrared crystal is disposed in the third aperture segment. Disposing the infrared crystal in the aperture segment with a smaller aperture reduces the cost of the electrochemical reaction cell.

[0009] According to some embodiments in this application, the diameter of the infrared crystal is 3mm-5mm. This reduces the possibility that an excessively small infrared crystal will make it difficult for light to pass through, and the possibility that an excessively large crystal will lead to decreased detection accuracy and increased costs.

[0010] According to some embodiments of this application, the size of each infrared crystal is 1mm-3mm in the thickness direction, which gives the infrared crystal a certain structural strength.

[0011] According to some embodiments of this application, the electrochemical reaction cell includes a central region and an edge region surrounding the central region. A first light-transmitting hole and a second light-transmitting hole are both disposed in the central region. The base also includes a plurality of first connecting holes located in the edge region and extending through it along the thickness direction, and a plurality of second connecting holes located in the edge region and extending through it along the thickness direction. The first connecting holes and second connecting holes are correspondingly disposed in the thickness direction. The electrochemical reaction cell also includes fasteners that pass through the first connecting holes and second connecting holes. The top cover and the base are connected by the fasteners and connecting holes, stabilizing their relative positions and clamping the electrodes and insulating components between them.

[0012] According to some embodiments of this application, the fastener is electrically connected to the base; the top cover also includes an insulating layer disposed on the side surface of the top cover facing the base and in the second connecting hole, thereby insulating the base from the top cover and the fastener from the top cover. This allows the base to achieve electrical connection with external components via the fastener, while the top cover and base are mutually insulated.

[0013] According to some embodiments of this application, an insulating layer is provided covering a portion of the edge region of the side surface of the top cover facing the base and the hole wall of the second connecting hole. A portion of the central region of the side surface of the top cover facing the base is used for electrical connection with one of the working electrode and the counter electrode closer to the top cover.

[0014] According to some embodiments of this application, an electrode lead-out end is provided in the second light-transmitting hole, and the orthographic projection of the electrode lead-out end and the orthographic projection of the infrared optical crystal are staggered along the thickness direction. The electrode lead-out end facilitates external power connection of the top cover.

[0015] According to some embodiments of this application, one of the electrode lead-out and the fastener is used for electrical connection to the positive electrode of the electrochemical workstation or charge / discharge machine, and the other is used for electrical connection to the negative electrode of the electrochemical workstation or charge / discharge machine. An electrical signal is applied to the working electrode and the counter electrode through the fastener and the electrode lead-out.

[0016] According to some embodiments of this application, a plurality of first connection holes and a plurality of second connection holes are equally spaced around the circumference of the electrochemical reaction cell. This ensures a stable connection between the top cover and the base and uniform force distribution.

[0017] According to some embodiments of this application, the base is provided with a reaction groove for accommodating at least one of the working electrode, the separator, and the counter electrode. The electrode is positioned by providing a groove, thereby improving stability.

[0018] According to some embodiments of this application, the reaction tank includes electrode grooves and diaphragm grooves arranged sequentially along the thickness direction. The electrode grooves are disposed between the diaphragm groove and the top cover. The electrode grooves are used to accommodate one of the working electrode plates and the counter electrode plate closest to the base. The diaphragm groove is used to accommodate a separator. In a cross-section perpendicular to the thickness direction, the cross-sectional area of ​​the diaphragm groove is larger than the cross-sectional area of ​​the electrode groove. This allows the separator to insulate the electrodes on both sides while maintaining a fixed position.

[0019] According to some embodiments of this application, the electrochemical reaction cell further includes a sealing element. The sealing element is disposed in the diaphragm groove and extends in a ring shape. The opposite sides of the sealing element abut against the bottom wall and the top cover of the diaphragm groove, respectively. Along the thickness direction, the orthographic projection of the sealing element surrounds the orthographic projection of the electrode groove. The sealing element achieves the sealing of the test environment and improves the accuracy of detection.

[0020] According to some embodiments of this application, the infrared crystal is made of germanium, silicon, diamond, zinc selenide, or quartz. This ensures that the infrared crystal has good transmittance for infrared light. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of an electrochemical reaction cell provided in some embodiments of this application;

[0023] Figure 2 for Figure 1 A cross-sectional view at point A-A' is shown below;

[0024] Figure 3 Schematic diagrams of the base provided in some embodiments of this application;

[0025] Figure 4 for Figure 3 The diagram shows the structure at point B-B'.

[0026] Figure 5 This application provides schematic diagrams of the top cover structure for some embodiments.

[0027] Figure 6 for Figure 5 The diagram shows the structure at point C-C'.

[0028] Figure label:

[0029] 100 - Electrochemical reaction cell; 200 - Working electrode; 300 - Isolator; 400 - Counter electrode;

[0030] 101 - Central region; 102 - Edge region;

[0031] 10-Base; 20-Top cover; 30-Infrared crystal; 40-First through hole; 50-Second through hole; 60-Fastener; 70-Seal;

[0032] 11-First light-transmitting hole; 12-First connecting hole; 13-Reaction tank; 21-Second light-transmitting hole; 22-Second connecting hole; 23-Insulating layer; 24-Electrode lead-out end;

[0033] 111 - First bore section; 112 - Second bore section; 131 - Electrode groove; 132 - Diaphragm groove; 211 - Third bore section; 212 - Fourth bore section;

[0034] X - Thickness direction. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0044] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0045] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0046] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0047] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0048] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0049] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0050] When designing batteries, it is often necessary to conduct simulation experiments on the internal environment of the battery to detect its reactions during operation. This process typically requires the use of an in-situ electrochemical reaction cell to monitor the electrolyte and determine what substances are produced during operation.

[0051] However, in order to provide the necessary pathway for the infrared light used in detection, existing electrochemical reaction cells are usually equipped with windows made of infrared crystals and the electrodes are set as wire, mesh or rod-shaped insert electrodes, which are quite different from the real environment inside the battery, resulting in poor authenticity and reliability of experimental results.

[0052] In view of this, the present application provides a technical solution that allows infrared light to pass through by setting through holes in the top cover, base and electrode to be tested of the reaction cell, thereby enabling the use of sheet electrodes for testing, and thus improving the authenticity, reliability and efficiency of the detection.

[0053] It is understood that this application applies the electrochemical reaction cell to the detection of electrolyte in a battery, but it should be understood that this application is not limited to this and can also be applied to other occasions where an electric field needs to be formed between two parallel electrodes for detection, and provide protection for them.

[0054] Next, we will combine the appendix Figure 1 To be continued Figure 6 The structure of the electrochemical reaction cell 100 is described.

[0055] Please refer to the following: Figures 1 to 2 , Figure 1 This is a schematic diagram of the structure of an electrochemical reaction cell provided in some embodiments of this application. Figure 2 for Figure 1 A cross-sectional view at point A-A' is shown.

[0056] In a first aspect, this application provides an electrochemical reaction cell 100, including a base 10 and a top cover 20. The base 10 is provided with a first light-transmitting hole 11 that extends through the thickness direction X of the electrochemical reaction cell 100. The top cover 20 is connected to the base 10 and is disposed opposite to it. The top cover 20 is provided with a second light-transmitting hole 21 that extends through the thickness direction X. Infrared crystals 30 are disposed in both the first light-transmitting hole 11 and the second light-transmitting hole 21. The base 10 and the top cover 20 are used to sandwich a working electrode plate 200, an isolator 300 and a counter electrode plate 400 between them. The working electrode plate 200 is provided with a first through hole 40 and the counter electrode plate 400 is provided with a second through hole 50. The first light-transmitting hole 11, the first through hole 40, the second through hole 50 and the second light-transmitting hole 21 are disposed opposite to each other along the thickness direction X.

[0057] This application provides an electrochemical reaction cell 100 (hereinafter referred to as reaction cell 100) which can be used for in-situ infrared spectroscopy testing. In-situ infrared spectroscopy testing is a detection method that combines electrochemical measurement methods and infrared spectroscopy technology. Specifically, infrared light is irradiated onto the reaction cell 100, and then the infrared light emitted through the reaction cell 100 or reflected by a preset interface in the reaction cell 100 is subjected to spectral detection. Based on the spectral detection results, it is determined what substances are produced in the reaction cell 100 during or after the reaction.

[0058] The reaction tank 100 provided in this application embodiment includes a top cover 20 and a base 10 that are interlocked and connected to each other. The two can be detachably connected by means of snap-fit, fastener 60 or other means, and the working electrode plate 200 to be tested, the isolator 300 and the counter electrode plate 400 are sandwiched between the two.

[0059] Specifically, the base 10 and the top cover 20 are respectively provided with a first light-transmitting hole 11 and a second light-transmitting hole 21 extending along the thickness direction X of the reaction cell 100. An infrared crystal 30 is embedded in each hole to allow infrared light to pass through. When conducting experiments using the reaction cell 100, the working electrode 200, the isolator 300, and the counter electrode 400 are stacked sequentially and sandwiched between the top cover 20 and the base 10. Optionally, both the base 10 and the top cover 20 can be made of an opaque, conductive material, such as metal, to facilitate electrical connection and block other interfering light from the outside.

[0060] Infrared crystals 30 can be installed in the first light-transmitting hole 11 and the second light-transmitting hole 21. The infrared crystals 30 are used to make the infrared light have a high transmittance, while reducing the possibility of external impurities falling into the reaction chamber and interfering with the detection results.

[0061] The working electrode 200 has a first through hole 40, and the counter electrode 400 has a second through hole 50. The first light-transmitting hole 11, the second light-transmitting hole 21, the first through hole 40, and the second through hole 50 are arranged opposite each other in the thickness direction X, and their orthogonal projections in this direction overlap. Therefore, when infrared light is incident through the second light-transmitting hole 21 of the top cover 20, the light can pass through the aforementioned four holes. To ensure uniform incident light, all four holes can be circular.

[0062] The reaction cell 100 can be selected for simulating and testing the internal environment of a battery. When setting the working electrode 200, separator 300, and counter electrode 400, the working electrode 200 can correspond to one of the positive and negative electrodes in the battery to be simulated, and the counter electrode 400 can correspond to one of the other two. The separator 300 is the same as the separator between the positive and negative electrodes in the battery. Before testing, the working electrode 200, separator 300, and counter electrode 400 should be immersed in an electrolyte identical to that used in the battery. This effectively improves the realism and reliability of the test.

[0063] Based on the above, the working electrode 200 and the counter electrode 400 are respectively provided with through holes, and the thickness of the isolation member 300 is usually thin, for example, less than 10 μm, so that infrared light can pass through. Therefore, the isolation member 300 can be provided without holes to further improve the authenticity of the detection.

[0064] By providing through holes in the base 10, top cover 20, working electrode 200, and counter electrode 400, with each of the four having corresponding through holes, infrared light can pass through the first light-transmitting hole 11, the second light-transmitting hole 21, the first through hole 40, and the second through hole 50. This allows the working electrode 200 and counter electrode 400 to be made into sheet-like shapes with a certain area, replacing the original, smaller insert-type electrodes, thus further simulating the internal environment of the battery and improving the accuracy of the experiment. Simultaneously, the working electrode 200 and counter electrode 400 can be directly used after cutting the positive and negative electrodes from the battery, making them easy to obtain and improving detection efficiency.

[0065] Please refer to the following: Figures 3 to 6 , Figure 3 This is a schematic diagram of the structure of the base provided in some embodiments of this application. Figure 4 for Figure 3 The diagram shows the structure at point B-B'. Figure 5 This is a schematic diagram of the top cover structure provided in some embodiments of this application. Figure 6 for Figure 5The diagram shows the structure at point C-C'.

[0066] In some alternative embodiments, in the thickness direction X, the cross-sectional area of ​​the first light-transmitting hole 11 and the cross-sectional area of ​​the second light-transmitting hole 21 both tend to increase in the direction away from each other.

[0067] When infrared light is irradiated into the reaction cell 100, to facilitate the incident light, the size of the light-transmitting aperture can be adjusted according to the optical path so that both the first light-transmitting aperture 11 and the second light-transmitting aperture 21 have a larger cross-sectional area on the side away from each other. Here, the cross-sectional area refers to the cross-sectional shape formed by the two light-transmitting apertures in a section perpendicular to the thickness direction X. Optionally, the shape of the infrared crystal 30 can be adapted to the shape of the light-transmitting aperture.

[0068] Specifically, taking the first light-transmitting hole 11 as an example, the cross-sectional area of ​​the first light-transmitting hole 11 increases in the direction away from the top cover 20. It can be selected as a uniform increase or a step increase, etc., as long as it is easy to process. During the detection, infrared light can be injected from the end with the larger cross-sectional area of ​​the second light-transmitting hole 21, and focused at a position near the isolation member 300, and then emitted from the end with the larger area of ​​the first light-transmitting hole 11.

[0069] By making the first light-transmitting hole 11 and the second light-transmitting hole 21 have a large cross-sectional area in their original positions relative to each other, the space available for light entering and exiting on both sides can be expanded, making it easier to adjust the infrared light path.

[0070] In some optional embodiments, the first light-transmitting hole 11 includes a first hole segment 111 and a second hole segment 112 arranged sequentially and interconnected along the direction close to the top cover 20. The cross-sectional area of ​​the first hole segment 111 is larger than the cross-sectional area of ​​the second hole segment 112. The infrared crystal 30 is disposed in the second hole segment 112. The second light-transmitting hole 21 includes a third hole segment 211 and a fourth hole segment 212 arranged and interconnected along the direction away from the base 10. The cross-sectional area of ​​the fourth hole segment 212 is larger than the cross-sectional area of ​​the third hole segment 211. The infrared crystal 30 is disposed in the third hole segment 211.

[0071] In embodiments where the first light-transmitting hole 11 and the second light-transmitting hole 21 have different cross-sectional areas at different positions, the first light-transmitting hole 11 may have a first hole segment 111 and a second hole segment 112 arranged sequentially in the thickness direction X, wherein the second hole segment 112 is disposed between the first hole segment 111 and the top cover 20, and the second hole segment 112 has a relatively small cross-sectional area.

[0072] It is understood that the first aperture segment 111 may have the same cross-sectional area at all locations, or the first aperture segment 111 itself may have a cross-sectional area that gradually increases in the direction away from the top cover 20. Similarly, the second aperture segment 112 may also have the same cross-sectional area at all locations or an increasing cross-sectional area in the direction away from the top cover 20. The second light-transmitting hole 21 may have a third aperture segment 211 and a fourth aperture segment 212 arranged along the thickness direction X. The structure of the second light-transmitting hole 21 may be symmetrical to the first light-transmitting hole 11, which will not be described in detail here.

[0073] Based on this, the infrared crystals 30 in the two light-transmitting holes can be respectively embedded in the second hole segment 112 and the third hole segment 211 with smaller cross-sectional areas. This allows the required volume of the infrared crystals 30 to be reduced while allowing light to pass through, thereby reducing the cost of the electrochemical reaction cell 100.

[0074] In some alternative embodiments, the diameter of the infrared crystal 30 is 3mm-5mm.

[0075] Optionally, both the first light-transmitting hole 11 and the second light-transmitting hole 21 are provided with infrared crystals 30. The size of the infrared crystals 30 in the two holes can be the same or similar, or the size of the infrared crystals 30 in the two holes can be adjusted according to the distance between them and the isolation component 300 to be detected. Based on this, the diameter of the infrared crystal 30 can be selected from 3mm to 5mm, for example, it can be any one of 3mm, 3.5mm, 4mm, 4.5mm, and 5mm or any two of them.

[0076] By limiting the diameter of the infrared crystal 30, the possibility that the infrared crystal 30 is too small and light cannot pass through easily can be reduced. At the same time, the possibility that the opening of the electrode plate will be enlarged due to the crystal being too large, which will reduce the detection accuracy and the possibility that the cost will be too high can also be reduced.

[0077] In some alternative embodiments, the size of each infrared crystal 30 is 1mm-3mm in the thickness direction X.

[0078] Similar to the diameter of the infrared crystal 30, its thickness can be 1mm-3mm, for example, any one of 1mm, 1.5mm, 2mm, 2.5mm, 3mm or somewhere in between. Optionally, each infrared crystal 30 can have the same or similar thickness throughout, making itself cylindrical to ensure uniform light distribution.

[0079] By limiting the thickness of the infrared crystal 30, the infrared crystal 30 can have a certain structural strength, reducing the possibility of increased costs due to excessive thickness, while also reducing the possibility of low structural strength and inability to withstand preset pressure due to excessive thinness.

[0080] In some optional embodiments, the electrochemical reaction cell 100 includes a central region 101 and an edge region 102 surrounding the central region 101. A first light-transmitting hole 11 and a second light-transmitting hole 21 are both disposed in the central region 101. The base 10 also includes a plurality of first connecting holes 12 located in the edge region 102 and extending through along the thickness direction X, and a plurality of second connecting holes 22 located in the edge region 102 and extending through along the thickness direction X. The first connecting holes 12 and the second connecting holes 22 are correspondingly disposed in the thickness direction X. The electrochemical reaction cell 100 also includes a fastener 60, which passes through the first connecting holes 12 and the second connecting holes 22.

[0081] Optionally, the electrochemical reaction cell 100 may include a central region 101 and an edge region 102 surrounding the central region 101. The boundary line between the two regions may be concentric with the edge of the reaction cell 100 as a whole and be arranged accordingly, for example, both may be circular. The aforementioned first light-transmitting hole 11, second light-transmitting hole 21, first through hole 40, and second through hole 50 may all be disposed in the central region 101, and may further be concentric with the central region.

[0082] Based on this, the portion of the base 10 located in the edge region 102 may further include a first connecting hole 12, and the portion of the top cover 20 located in the edge region 102 may further include a second connecting hole 22. The first connecting hole 12 and the second connecting hole 22 may have the same size and number, and be arranged facing each other in the thickness direction X. By passing a fastener 60 through both the first connecting hole 12 and the second connecting hole 22 simultaneously, the base 10 and the top cover 20 can be reliably and detachably connected together. The first connecting hole 12 and the second connecting hole 22 may be threaded holes.

[0083] By using fasteners 60 and connecting holes to connect the top cover 20 and the base 10, the relative positions of the two can be stabilized and they are not easy to separate. Furthermore, the clamping force can be easily adjusted based on the electrodes and the isolation piece 300 clamped between them.

[0084] In some alternative embodiments, the fastener 60 is electrically connected to the base 10; the top cover 20 also includes an insulating layer 23 disposed on the side surface of the top cover 20 facing the base 10 and in the second connection hole 22, and insulating the base 10 from the top cover 20 and the fastener 60 from the top cover 20.

[0085] When using the reaction tank 100, a working electrode plate 200, an isolation member 300 and a counter electrode plate 400 are sandwiched between the top cover 20 and the base 10. The two electrode plates are respectively disposed on both sides of the isolation member 300, one of which can abut against the top cover 20, while the other can abut against the base 10.

[0086] Based on this, in order to facilitate the insulation of the two electrode plates and the lead-out of the electrical connection, an insulating layer 23 can be provided on the side surface of the top cover 20 facing the base 10 and in the second connection hole 22 of the top cover 20, thereby achieving mutual insulation between the top cover 20 and the base 10.

[0087] Specifically, during the testing process, taking the working electrode 200 close to the base 10 and the counter electrode 400 close to the top cover 20 as an example, the working electrode 200 abuts against the base 10 and is at the desired potential with the base 10 and the fastener 60. That is, an electrical signal can be applied to the working electrode 200 by electrically connecting it to the fastener 60.

[0088] Correspondingly, the top cover 20 abuts against and is electrically connected to the counter electrode plate 400. Since an insulating layer 23 is provided between the top cover 20 and the base 10, and in the second connecting hole 22 of the top cover 20, the top cover 20 can be insulated from the base 10, the fastener 60, and the working electrode plate 200. An electrical signal can be applied to the counter electrode plate 400 by electrically connecting it to the top cover 20.

[0089] Therefore, by setting the insulating layer 23, the top cover 20 can be electrically connected to the base 10 and the fastener 60, thereby enabling the base 10 to be electrically connected to external components through the fastener 60, which facilitates the electrical connection of the reaction tank 100 as a whole to the power supply, and the structure is simple and reliable.

[0090] In some alternative embodiments, the insulating layer 23 covers a portion of the side surface of the top cover 20 facing the base 10 in the edge region 102 and the hole wall of the second connection hole 22. A portion of the side surface of the top cover 20 facing the base 10 in the center region 101 is used for electrical connection with one of the working electrode plate 200 and the counter electrode plate 400 closest to the top cover 20.

[0091] In embodiments where the top cover 20 is provided with an insulating layer 23, the insulating layer 23 can cover the entire wall of the second connecting hole 22, as well as a portion of the surface of the top cover 20 facing the base 10. Specifically, the surface of the top cover 20 facing the base 10 is referred to as the first surface. The portion of the first surface located in the edge region 102 can be covered by the insulating layer 23 to insulate the top cover 20 from the base 10 and from one of the electrode plates near the base 10. At the same time, the portion of the first surface located in the central region can be exposed and abut against the one of the two electrode plates closest to the top cover 20 to electrically connect the top cover 20 to that electrode plate.

[0092] By setting the insulating layer 23 to cover part of the surface of the top cover 20 and the wall of the second connection hole 22, it is possible to electrically connect the top cover 20 to one of the electrode plates closest to the top cover 20 while insulating the top cover 20 from the base 10, so that electrical signals can be conveniently applied to the two electrode plates while achieving mutual insulation between the two electrode plates.

[0093] In some optional embodiments, an electrode lead-out end 24 is provided in the second light-transmitting hole 21, and the orthographic projection of the electrode lead-out end 24 is offset from the orthographic projection of the infrared optical crystal along the thickness direction X.

[0094] Alternatively, similar to the fastener 60, in order to facilitate the connection of the electrode plates to an external power source, an electrode lead-out end 24 can be provided in the second light-transmitting hole 21 to lead out the electrode plate on the side that is close to the top cover 20 and electrically connected to the top cover 20.

[0095] Optionally, the electrode lead-out end 24 can be disposed in the second connecting hole 22. In embodiments where the cross-sectional area of ​​the second connecting hole 22 increases in the direction away from the base 10, the electrode lead-out end 24 can protrude from the annular interface between two hole segments with different diameters and extend to be flush with or slightly protruding from the surface of the top cover 20 opposite to the base 10. The electrode lead-out end 24 can optionally extend along the thickness direction X and be spaced apart from the sidewall of the second through hole 50 that is parallel to the thickness direction X, so as to form a connection terminal that facilitates electrical connection.

[0096] By setting the electrode lead-out terminal 24, the top cover 20 can be easily connected to external power, thus improving the applicability of the reaction tank 100.

[0097] In some alternative embodiments, one of the electrode lead 24 and the fastener 60 is used for electrical connection to the positive electrode of the electrochemical workstation or charge / discharge machine, and the other is used for electrical connection to the negative electrode of the electrochemical workstation or charge / discharge machine.

[0098] With the aforementioned electrode lead-out end 24 and insulating layer 23 provided, electrical signals can be applied to the working electrode plate 200 and the counter electrode plate 400 through the electrode lead-out end 24 and fastener 60. In other words, electrical connections can be made through terminals on the side of the top cover 20 away from the base 10 that facilitate electrical connection, thereby further improving the reliability of the reaction cell 100.

[0099] Optionally, the electrode lead-out 24 and the fastener 60 can be electrically connected to the two poles of an electrochemical workstation or a charge / discharge machine via wiring, thereby applying a preset electrical signal to the two electrode plates, that is, charging and discharging the simulated battery environment in the reaction cell 100 to achieve the electrical conditions required for detection. Specifically, when making electrical connections, the connections can be made according to the material of the working electrode plate 200 and the counter electrode plate 400 or their application as positive / negative electrodes in the battery cell.

[0100] In some optional embodiments, a plurality of first connection holes 12 and a plurality of second connection holes 22 are respectively arranged at equal intervals in the circumferential direction of the electrochemical reaction cell 100.

[0101] In an embodiment where both the base 10 and the top cover 20 are provided with connection holes and connected by fasteners 60 passing through the connection holes, the plurality of first connection holes 12 and the plurality of second connection holes 22 may be equally spaced around the circumference of the reaction tank 100, and the distances between the plurality of first connection holes 12 and the plurality of second connection holes 22 and the central axis of the reaction tank 100 may be the same or similar. For example, the reaction tank 100 may be provided with four first connection holes 12 and four second connection holes 22.

[0102] By arranging the connecting holes at equal intervals in the circumferential direction, the top cover 20 and the base 10 can be stably connected and subjected to uniform force.

[0103] In some alternative embodiments, the base 10 is provided with a reaction tank 13 for accommodating at least one of the working electrode 200, the separator 300, and the counter electrode 400.

[0104] Optionally, to fix the relative positions of the working electrode 200, the spacer 300, and the counter electrode 400 with the top cover 20 and the base 10 during the experiment, the base 10 may be provided with a reaction groove 13 for accommodating at least one of the three stacked test components. Taking the working electrode 200 abutting against the base 10 as an example, the reaction groove 13 may be used to accommodate the working electrode 200, or the reaction groove 13 may be used to accommodate the working electrode 200 and the spacer 300. The counter electrode 400 may optionally be partially disposed in the reaction groove 13.

[0105] The reaction tank 13 can be configured to conform to the shape of the base 10, and its size can be designed according to the size of the electrode to be tested. Alternatively, the size of the reaction tank 13 can be slightly larger than the size of the electrode to limit the electrode and the like placed therein.

[0106] The structure of the reaction tank 13 is easy to manufacture and can stably limit the position of the electrode, thereby further improving the reliability of the reaction cell 100.

[0107] In some optional embodiments, the reaction tank 13 includes an electrode groove 131 and a diaphragm groove 132 arranged sequentially along the thickness direction X. The electrode groove 131 is disposed between the diaphragm groove 132 and the top cover 20. The electrode groove 131 is used to accommodate one of the working electrode plate 200 and the counter electrode plate 400 that is closer to the base 10. The diaphragm groove 132 is used to accommodate the separator 300. In a cross section perpendicular to the thickness direction X, the cross-sectional area of ​​the diaphragm groove 132 is larger than the cross-sectional area of ​​the electrode groove 131.

[0108] Optionally, in order to simultaneously limit one of the working electrode 200, the counter electrode 400, and the separator 300, the reaction tank 13 may include electrode grooves and diaphragm grooves 132 arranged sequentially and interconnected along the thickness direction X. The electrode grooves are used to accommodate one of the working electrode 200 and the counter electrode 400 that is closest to the base 10, and the diaphragm grooves 132 are used to accommodate the separator 300, thereby further improving the stability and reliability of the limiting.

[0109] Optionally, to ensure a reliable insulating relationship between the working electrode 200 and the counter electrode 400, the size of the separator 300 can be larger than the size of the electrode. Correspondingly, the size of the diaphragm groove 132 can be larger than the size of the electrode groove. Along the thickness direction X, the orthographic projection of the diaphragm groove 132 and the orthographic projection of the electrode groove can be concentrically arranged, and the orthographic projection of the diaphragm groove 132 can cover the orthographic projection of the electrode groove.

[0110] By setting electrode slots and diaphragm slots 132 with an area larger than the electrode slots, the reliability of the insulating element 300 insulating the electrode plates on both sides can be improved while fixing the positions of the electrode plates and the insulating element 300.

[0111] In some optional embodiments, the electrochemical reaction cell 100 further includes a seal 70, which is disposed in the diaphragm groove 132 and extends in an annular shape. The opposite sides of the seal 70 abut against the bottom wall of the diaphragm groove 132 and the top cover 20, respectively. Along the thickness direction X, the orthographic projection of the seal 70 surrounds the orthographic projection of the electrode groove 131.

[0112] Optionally, a sealing element 70 is also sandwiched between the base 10 and the top cover 20. This sealing element 70 is disposed in the diaphragm groove 132 and may be conformally shaped to and abut against the side wall of the diaphragm groove 132. The two opposite ends of the sealing element 70 in the thickness direction X may respectively abut against the bottom wall of the diaphragm groove 132 and the surface of the top cover 20 facing the base 10. In embodiments where the top cover 20 is provided with an insulating layer 23, one side of the diaphragm groove 132 may abut against the insulating layer 23 to improve the reliability of insulation and sealing.

[0113] The seal 70 can be made of an insulating material with a certain degree of elastic deformation capability and will not react with the electrolyte being tested, so as to provide a well-sealed environment while reducing the possibility of interference with the experiment. The seal 70 may be annular and extend along the sidewall of the diaphragm groove 132. The outer diameter of the seal 70 may be slightly smaller than the diameter of the diaphragm groove 132, and the inner diameter of the seal 70 may be greater than or equal to the diameter of the electrode groove, so that the seal 70 can stably abut against the subbottom of the diaphragm groove 132.

[0114] When conducting experiments using the reaction cell 100, the working electrode 200 and the counter electrode 400, particularly the one closest to the top cover 20, can be partially positioned within the diaphragm groove 132 and surrounded by the seal 70. Thus, the cooperation between the seal 70 and the reaction cell 13 provides a well-sealed detection environment, thereby further improving detection accuracy.

[0115] In some alternative embodiments, the infrared crystal 30 is made of germanium, silicon, diamond, zinc selenide, or quartz.

[0116] Both the base 10 and the top cover 20 of the reaction cell 100 are embedded with infrared crystals 30, and these infrared crystals 30 are positioned in the infrared light path during the experiment in the reaction cell 100. Therefore, the infrared crystals 30 can be made of germanium, silicon, diamond, zinc selenide, or quartz. Infrared crystals 30 made of any of these materials can have high transmittance for light, especially infrared light, and low input loss, thereby reducing the loss of infrared light during its passage through the reaction cell 100 and improving the detection accuracy of the reaction cell 100.

[0117] Optionally, in the reaction tank 100, the optical crystal disposed in the first light-transmitting hole 11 and the optical crystal disposed in the second light-transmitting hole 21 can be made of the same or different materials. In embodiments with different materials, the thickness of the infrared crystal 30 can be selected according to parameters such as the transmittance, structural strength, and cost of the material itself.

[0118] This application provides an electrochemical reaction cell 100, including a base 10 and a top cover 20. The base 10 is provided with a first light-transmitting hole 11 that extends through the thickness direction X of the electrochemical reaction cell 100. The top cover 20 is connected to the base 10 and is disposed opposite to it. The top cover 20 is provided with a second light-transmitting hole 21 that extends through the thickness direction X. Infrared crystals 30 are disposed in both the first light-transmitting hole 11 and the second light-transmitting hole 21. The base 10 and the top cover 20 are used to sandwich a working electrode plate 200, an isolator 300 and a counter electrode plate 400 between them. The working electrode plate 200 is provided with a first through hole 40 and the counter electrode plate 400 is provided with a second through hole 50. The first light-transmitting hole 11, the first through hole 40, the second through hole 50 and the second light-transmitting hole 21 are disposed opposite to each other along the thickness direction X.

[0119] The electrochemical reaction cell 100 includes a central region 101 and an edge region 102 surrounding the central region 101. A first light-transmitting hole 11 and a second light-transmitting hole 21 are both located in the central region 101. The base 10 also includes a plurality of first connecting holes 12 located in the edge region 102 and extending through it along the thickness direction X, and a plurality of second connecting holes 22 located in the edge region 102 and extending through it along the thickness direction X. The first connecting holes 12 and second connecting holes 22 are correspondingly arranged in the thickness direction X. The electrochemical reaction cell 100 also includes a fastener 60, which passes through the first connecting holes 12 and the second connecting holes 22. The fastener 60 is electrically connected to the base 10. The top cover 20 also includes an insulating layer 23, which is disposed on the side of the top cover 20 facing the base 10 and in the second connecting holes 22, thus insulating the base 10 from the top cover 20 and the fastener 60 from the top cover 20. An electrode lead-out end 24 is provided in the second light-transmitting hole 21. Along the thickness direction X, the orthographic projection of the electrode lead-out end 24 is offset from the orthographic projection of the infrared optical crystal.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrochemical reaction cell characterized by, The application relates to an electrochemical reaction cell. The base is provided with a first light-transmitting hole penetrating in the thickness direction of the electrochemical reaction cell; The top cover is connected with the base and is oppositely arranged, and the top cover is provided with a second light-transmitting hole penetrating in the thickness direction, and the first light-transmitting hole and the second light-transmitting hole are both provided with infrared crystals; The base and the top cover are used for clamping a working electrode, a separator and a counter electrode therebetween, wherein the working electrode is provided with a first through hole, the counter electrode is provided with a second through hole, and the first light-transmitting hole, the first through hole, the second through hole and the second light-transmitting hole are oppositely arranged in the thickness direction.

2. The electrochemical reaction cell of claim 1, wherein, In the thickness direction, the cross-sectional area of the first light-transmitting hole and the cross-sectional area of the second light-transmitting hole both increase in the direction away from each other.

3. The electrochemical reaction cell of claim 2, wherein, The first light-transmitting hole comprises a first hole section and a second hole section arranged in sequence and communicated with each other in the direction close to the top cover, the cross-sectional area of the first hole section is larger than that of the second hole section, and the infrared crystal is arranged in the second hole section. The second light-transmitting hole comprises a third hole section and a fourth hole section arranged in sequence and communicated with each other in the direction away from the base, the cross-sectional area of the fourth hole section is larger than that of the third hole section, and the infrared crystal is arranged in the third hole section.

4. The electrochemical reaction cell of claim 3, wherein, The diameter of the infrared crystal is 3-5 mm.

5. The electrochemical reaction cell of claim 1, wherein, In the thickness direction, the size of each infrared crystal is 1-3 mm.

6. The electrochemical reaction cell of claim 1, wherein, The electrochemical reaction cell comprises a central region and an edge region surrounding the central region, and the first light-transmitting hole and the second light-transmitting hole are arranged in the central region. The base further comprises a plurality of first connecting holes arranged in the edge region and penetrating in the thickness direction, and further comprises a plurality of second connecting holes arranged in the edge region and penetrating in the thickness direction, and the first connecting holes and the second connecting holes are correspondingly arranged in the thickness direction. The electrochemical reaction cell further comprises a fastener penetrating in the first connecting hole and the second connecting hole.

7. The electrochemical reaction cell of claim 6, wherein, The fastener is electrically connected with the base. The top cover further comprises an insulating layer arranged on the side surface of the top cover facing the base and in the second connecting hole, and the base and the top cover and the fastener and the top cover are arranged to be insulated from each other.

8. The electrochemical reaction cell of claim 7, wherein, The insulating layer covers the part of the side surface of the top cover facing the base in the edge region and the hole wall of the second connecting hole, and the part of the side surface of the top cover facing the base in the central region is used for electrically connecting with one of the working electrode and the counter electrode close to the top cover.

9. The electrochemical reaction cell of claim 7, wherein, The second light-transmitting hole is provided with an electrode lead-out end, and the orthogonal projection of the electrode lead-out end and the orthogonal projection of the infrared crystal are arranged to be staggered in the thickness direction.

10. The electrochemical reaction cell of claim 9, wherein, One of the electrode lead-out end and the fastener is used for electrically connecting with the positive electrode of an electrochemical workstation or a charge-discharge machine, and the other is used for electrically connecting with the negative electrode of the electrochemical workstation or the charge-discharge machine.

11. The electrochemical reaction cell of claim 6, wherein, The first connection holes and the second connection holes are arranged at equal intervals in the circumferential direction of the electrochemical reaction cell.

12. The electrochemical reaction cell of claim 1, wherein, The base is provided with a reaction groove for accommodating at least one of the working electrode, the separator and the counter electrode.

13. The electrochemical reaction cell of claim 12, wherein, The reaction groove comprises an electrode groove and a diaphragm groove arranged in sequence along the thickness direction, the electrode groove is arranged between the diaphragm groove and the top cover, the electrode groove is used for accommodating one of the working electrode and the counter electrode close to the base, and the diaphragm groove is used for accommodating the separator, and the cross-sectional area of the diaphragm groove is greater than that of the electrode groove in a cross section perpendicular to the thickness direction.

14. The electrochemical reaction cell of claim 13, wherein, The electrochemical reaction cell further comprises a sealing member arranged in the diaphragm groove and extending in a ring shape, and opposite sides of the sealing member abut against the bottom wall of the diaphragm groove and the top cover respectively. In the thickness direction, the orthogonal projection of the sealing member surrounds the orthogonal projection of the electrode groove.

15. The electrochemical reaction cell of claim 1, wherein, The infrared crystal is a germanium, silicon, diamond, zinc selenide or quartz material.

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