Wide-temperature-range electrochemical in-situ X-ray absorption spectrum testing device

Abstract

The invention provides a wide-temperature-range electrochemical in-situ X-ray absorption spectrum testing device which comprises a heat conduction table, a plurality of temperature control surfaces are arranged on a main body of the heat conduction table, and the plurality of temperature control surfaces are adjacent to each other to form a polygonal enclosed structure; the heat conduction table main body is further provided with a temperature controlled surface, the temperature controlled surface is arranged on one side of the polygonal enclosure structure, and through the design that the plurality of temperature control surfaces of the heat conduction table are of the polygonal enclosure structure and refrigeration and heating are carried out through the temperature control assembly, rapid and accurate wide-temperature-range temperature control on the test groove of the temperature controlled surface is realized; and the test groove is used as a battery carrying platform and is matched with the battery clamp to realize quick replacement of the button battery, so that the test efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical transmission spectrum, in particular to a wide temperature range electrochemical in-situ X-ray absorption spectrum testing device. BACKGROUND

[0002] To cope with climate and energy crisis, and achieve the "double carbon" goal of China, renewable energy such as photovoltaic and wind power has been paid attention. However, the intermittency and uneven spatial distribution of renewable energy have become the core bottleneck restricting its large-scale application. For example, photovoltaic power generation is only effective during daylight hours and cannot match the peak and valley of night electricity. Therefore, energy storage technology has become a core challenge of energy transformation. Among many energy storage technologies, electrochemical energy storage stands out due to its fast response speed (millisecond level), environmental friendliness, and flexible modular deployment. Lithium ion battery (LIB) has become the mainstream choice due to its high energy density (250-300 Wh / kg), long life (>2000 weeks) and mature commercial application.

[0003] Although lithium ion batteries are currently widely used, due to their complex use scenarios, the temperature factor changes greatly in actual operating conditions, especially at extreme temperatures (<0℃ or >60℃), the performance of lithium ion batteries will decrease significantly and there is a safety risk. With the expansion of human activities to polar regions, deep sea and outer space, the market urgently needs high-performance batteries that can work stably in a wide temperature range. Developing such batteries has become a strategic focus of energy storage technology innovation, and the technical bottleneck lies in understanding and solving the problem of performance decline or failure of batteries at extreme temperatures.

[0004] The performance of lithium ion batteries in a wide temperature range is restricted by the electrochemical reaction of the positive electrode material. Electrochemical in-situ X-ray absorption spectroscopy is one of the powerful means to monitor the changes of element valence and local electronic structure of positive electrode materials during charging and discharging. It monitors the chemical state changes of metal elements in positive active materials during charging and discharging of the battery in real time, providing key information for understanding the electrochemical dynamic reaction mechanism, and further helping us to analyze the influence of temperature on the electrochemical reaction process. However, conventional electrochemical in-situ X-ray absorption spectroscopy equipment can usually only be tested at room temperature, and cannot change the temperature to characterize the electrode reaction dynamic process under the condition of a wide temperature range.

[0005] Existing X-ray absorption spectroscopy basically does not have a temperature control system for the experimental device, which is difficult to meet the battery testing needs in a wide temperature range. Therefore, it is urgent to develop an electrochemical in-situ X-ray absorption spectroscopy testing device with low cost, strong universality and accurate temperature control. SUMMARY

[0006] To solve at least one of the above problems, the present application provides a wide temperature range electrochemical in-situ X-ray absorption spectrum testing device.

[0007] The present application adopts the following scheme to achieve the above purposes: The present application provides a wide temperature range electrochemical in-situ X-ray absorption spectrum testing device, comprising: The shell comprises a cavity, a front cover plate, a rear cover plate and a support, the cavity is a cylindrical cavity structure with open front and rear ends, the front cover plate and the rear cover plate are respectively sealed to the front and rear ends of the cavity; the front cover plate and the rear cover plate are both provided with an X-ray transparent light hole, and the light hole is sealed with an X-ray transparent material; The heat-conducting table is installed in the shell, and the heat-conducting table comprises a heat-conducting table body, the heat-conducting table body is provided with a plurality of temperature control surfaces, the plurality of temperature control surfaces are adjacent to each other and form a polygonal enclosure structure; the heat-conducting table body is also provided with a temperature controlled surface, the temperature controlled surface is arranged on one side of the polygonal enclosure structure; the temperature controlled surface is provided with a test slot, and the bottom surface of the test slot is provided with an X-ray transparent light hole; The battery clamp is installed in the test slot, and the battery clamp is used to clamp and install a battery and is provided with an electrode lead-out structure to lead out the positive and negative electrodes of the battery; the battery clamp can provide an environment field based on a preset temperature for the battery with the help of the heat-conducting table; The temperature control assembly is attached to the temperature control surfaces of the heat-conducting table; the temperature control assembly is used to adjust the temperature of the test slot through heat conduction of the heat-conducting table; The temperature sensor is installed on the heat-conducting table, and the temperature sensor is used to monitor the temperature of the test slot; The functional interface is arranged on the shell, and the functional interface at least comprises a ventilation interface, a temperature monitoring interface, a battery positive and negative electrode interface and a temperature control interface.

[0008] In one embodiment, the heat-conducting table body is provided with four temperature control surfaces, two adjacent temperature control surfaces are arranged opposite to the other two temperature control surfaces, so that the four temperature control surfaces form a rectangular enclosure structure; the temperature controlled surface is arranged on one side of the four temperature control surfaces forming a rectangular enclosure structure, and the temperature controlled surface is arranged perpendicular to the four temperature control surfaces.

[0009] In one embodiment, the battery clamp comprises a first clamp body and a second clamp body, the battery clamp is provided with a battery installation slot for installing a battery; the first clamp body and the second clamp body are separated by an insulating gasket; the first clamp body is provided with a screw hole for passing a screw to connect the first clamp body and the second clamp body, and the screw hole is provided with an insulating material inside and around the screw hole.

[0010] In one embodiment, the insulating material inside and around the screw hole is PEEK material; and / or, the insulating gasket is silicone material.

[0011] In one embodiment, the temperature control component includes a TEC heating and cooling element and a heat dissipation copper busbar; the TEC heating and cooling element is disposed against the temperature control surface; the heat dissipation copper busbar is disposed on the TEC heating and cooling element, and the heat dissipation copper busbar and the temperature control surface are respectively located on opposite sides of the TEC heating and cooling element, and the heat dissipation copper busbar is provided with a heat exchange fluid channel; the functional interface also includes a liquid inlet and a liquid outlet.

[0012] In one embodiment, the heat-conducting stage extends from the temperature-controlled surface and has a sidewall that encloses the test groove. The sidewall has a sensor mounting hole, and the temperature sensor is mounted in the sensor mounting hole. The temperature sensor is a PT100 thermistor.

[0013] In one embodiment, a column is provided between two adjacent temperature-controlled surfaces, and a locking plate is provided at the end of the column away from the temperature-controlled surface. The edge of the temperature-controlled surface extends radially outward to form a flange structure. The inner wall of the cavity is provided with an annular flange and multiple inner connecting plates, which are distributed circumferentially along the inner wall of the cavity. The annular flange is used to connect with the flange structure, and the inner connecting plates are used to connect with the locking plate. Thermal insulation cotton is installed between the heat-conducting platform and the inner wall of the cavity.

[0014] In one embodiment, the front cover plate includes a front cover plate body and a light hole sealing plate. At least one sealing groove is provided around the light hole of the front cover plate body. The sealing groove is used to place a sealing ring. A polyimide film is sandwiched between the front cover plate body and the light hole sealing plate and is fixed and sealed by screws. The rear cover plate includes a rear cover plate body and a light hole sealing plate. At least one sealing groove is provided around the light hole of the rear cover plate body. The sealing groove is used to place a sealing ring. A polyimide film is sandwiched between the rear cover plate body and the light hole sealing plate and is fixed and sealed by screws.

[0015] In one embodiment, the heat conduction stage further includes a heat conduction stage cover plate, and the battery clamp is installed between the heat conduction stage body and the heat conduction stage cover plate; the heat conduction stage and the battery clamp are made of copper; the battery is a button cell assembled from positive and negative electrode shells and the sample to be tested, and both the positive and negative electrode shells of the battery have openings and are sealed with polyimide film.

[0016] In one embodiment, the cavity, the front cover, and the rear cover are made of aluminum alloy; and / or, the X-ray permeable material is a polyimide film.

[0017] The technical solution provided by this invention has the following technical effects: This invention provides a wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device, including a heat-conducting stage. The main body of the heat-conducting stage has multiple temperature-controlling surfaces, which are adjacent and form a polygonal enclosure structure. The main body of the heat-conducting stage also has a temperature-controlled surface, which is located on one side of the polygonal enclosure structure. Through the design of the multiple temperature-controlling surfaces of the heat-conducting stage forming a polygonal enclosure structure, and through cooling and heating by temperature control components, rapid and accurate wide-temperature-range temperature control of the test cell on the temperature-controlled surface is achieved. Furthermore, the test cell serves as a battery carrier, and with the help of battery clamps, it enables rapid replacement of coin cells, greatly improving testing efficiency. A venting interface allows for vacuuming of the sealed housing, thereby reducing heat transfer between the heat-conducting stage and the cavity, resulting in more accurate temperature control of the test cell and the battery. Vacuuming the housing also prevents condensation from freezing at low temperatures, which could affect temperature control. Attached Figure Description

[0018] Figure 1 This is a perspective view of the testing device according to an embodiment of the present invention; Figure 2 This is an exploded view of the testing apparatus according to an embodiment of the present invention; Figure 3 This is a perspective view of the housing without the cover plate according to an embodiment of the present invention; Figure 4 This is a perspective view of the housing of an embodiment of the present invention with the cover plate removed from another direction; Figure 5 This is a perspective view of the front cover plate according to an embodiment of the present invention; Figure 6 This is a perspective view of the heat conduction stage according to an embodiment of the present invention; Figure 7 This is a perspective view of the second clamping device according to an embodiment of the present invention; Figure 8 This is a perspective view of the first clamping device according to an embodiment of the present invention; Figure 9 This is a perspective view of the first clamping body according to an embodiment of the present invention from another direction; Figure 10 This is a perspective view of the rear cover plate according to an embodiment of the present invention. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] Reference Figures 1-10 As shown, this embodiment provides a wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device 1, including a housing 10, a heat-conducting stage 20, a battery clamp 30, and a temperature control component 40. The housing 10 is a cylindrical hollow structure used to install the heat-conducting stage 20, the battery clamp 30, and the temperature control component 40 therein. The housing 10 includes a cavity 11, a front cover plate 12, a rear cover plate 13, and a bracket 14. The cavity 11 is a cylindrical hollow structure with openings at both the front and rear ends. The front cover plate 12 and the rear cover plate 13 respectively seal and connect the front and rear ends of the cavity 11. (Refer to...) Figure 3 and Figure 4 The front and rear end faces of the cavity 11 are provided with annular sealing grooves 111. The annular sealing grooves 111 are used to install sealing rings, so that the shell 10 becomes an enclosed and sealed structure.

[0022] Reference Figure 5 and Figure 10 Both the front cover plate 12 and the rear cover plate 13 are provided with X-ray-transmitting light holes C. The light holes C are sealed with X-ray-transmitting materials, such as polyimide film (not shown). Polyimide film is a yellow transparent high-temperature resistant insulating material with excellent thermal stability, chemical corrosion resistance and mechanical properties.

[0023] Reference Figure 6 The heat conduction stage 20 includes a heat conduction stage body 21, which has multiple temperature control surfaces 22. The multiple temperature control surfaces 22 are adjacent to each other and form a polygonal enclosure structure. In this embodiment, the heat conduction stage body 21 has four temperature control surfaces 22. Figure 6The diagram shows two adjacent temperature control surfaces 22a and 22b, with the remaining two temperature control surfaces positioned opposite to them, forming a rectangular enclosure of four temperature control surfaces 22. The heat conduction stage body 21 also includes a temperature-controlled surface 23, located on one side of the polygonal enclosure. In this embodiment, the temperature-controlled surface 23 is positioned on one side of the four rectangular enclosure temperature control surfaces 22, and is perpendicular to all four surfaces. The temperature-controlled surface 23 has a test slot 25. The test slot 25 can be used to install the battery 50 and its corresponding battery clamp 30. The heat conduction stage body 21 has an X-ray-transmitting aperture C at its center, located on the bottom surface of the test slot 25. The heat conduction stage 20 is made of copper, serving as a good heat transfer medium.

[0024] Reference Figure 2 , Figures 7-9 The battery clamp 30 has a double-layered, separable structure, including a first clamp body 31 and a second clamp body 32. The battery clamp 30 has a battery mounting slot 33 for mounting the battery 50. The battery mounting slot 33 can be located in either the first clamp body 31 or the second clamp body 32, or each clamp body 31 and the second clamp body 32 can have a portion of the battery mounting slot 33. The first clamp body 31 and the second clamp body 32 are connected to form a complete battery mounting slot 33. The battery clamp 30 is made of copper, and the battery clamp 30 can provide the battery 50 with an environmental field based on a preset temperature using a heat-conducting platform 20. The first clamp body 31 has a first electrode lead-out structure 311, and the second clamp body 32 has a second electrode lead-out structure 321. The first electrode lead-out structure 311 and the second electrode lead-out structure 321 are used to lead out the positive and negative electrodes of the battery 50. An insulating pad, such as a silicone material, is provided between the first clamping body 31 and the second clamping body 32 to enhance the insulation performance between the first clamping body 31 and the second clamping body 32, thereby enhancing the insulation performance between the positive and negative electrodes of the battery 50.

[0025] The battery 50 is a button cell 50 assembled from positive and negative electrode shells and the sample to be tested. Both the positive and negative electrode shells of the button cell 50 have openings and are sealed with X-ray permeable materials, such as polyimide film.

[0026] The temperature control component 40 is attached to the heat conduction stage 20, or more specifically, the temperature control component 40 is attached to the temperature control surface 22 of the heat conduction stage 20; the temperature control component 40 can be used to adjust the temperature of the test tank 25 through heat conduction from the heat conduction stage 20.

[0027] The temperature control component 40 includes a TEC (Thermoelectric Temperature Coefficient) heating and cooling element 41, which is attached to the temperature control surface 22. The TEC heating and cooling element 41 is a semiconductor temperature controller. Semiconductor temperature control is based on the Peltier effect, that is, when a direct current passes through a semiconductor thermocouple pair, electrons move from the N-type semiconductor to the P-type semiconductor, while holes move in the opposite direction, resulting in heat absorption (cold end) and heat release (hot end) processes at the junction. This method is suitable for in-situ testing scenarios with a temperature range of -20 to 60 ℃ and requiring rapid temperature changes. However, its cooling efficiency decreases significantly with increasing temperature difference, and a water-cooling or air-cooling system is required to maintain stable performance during high-power operation. Based on the above considerations, the temperature control component 40 in this embodiment further includes a heat dissipation copper busbar 42, which is attached to the TEC heating and cooling chip 41. The heat dissipation copper busbar 42 and the temperature control surface 22 are located on opposite sides of the TEC heating and cooling chip 41. The heat dissipation copper busbar 42 is provided with heat exchange fluid channels 421 and 422 for promoting heat exchange, such as channels for cooling water to flow through, thereby achieving high-power rapid temperature change and forming a semiconductor temperature control test device with an integrated water-cooling system. In this embodiment, the TEC heating and cooling chip is used for temperature control. Compared with traditional fluid circulation temperature control, the temperature change speed of this embodiment is faster, and the system is simple and occupies a small volume.

[0028] Reference Figure 6 The heat-conducting stage 20 extends from the temperature-controlled surface 23 and has a sidewall 24, which encloses and forms a test groove 25. The sidewall 24 has sensor mounting holes 26, which can be further referenced... Figure 2 A temperature sensor 60, such as a PT100 thermistor, is installed in the sensor mounting hole 26 to monitor the temperature of the test tank 25. The temperature sensor 60 is embedded in the heat-conducting stage 20 through the sensor mounting hole 26. The built-in PT1000 thermistor is used to feed back the real-time temperature to the temperature controller and uses PID control to achieve precise temperature control with an accuracy of ±0.5℃, providing high control precision.

[0029] This device utilizes the polygonal enclosure structure of multiple temperature-controlled surfaces 22 on the heat-conducting stage 20, along with the TEC heating and cooling element 41 combined with liquid cooling for both cooling and heating, to achieve rapid and precise wide-range temperature control of the test chamber 25 on the temperature-controlled surface 23. This provides a wide-range electrochemical in-situ X-ray absorption spectroscopy testing device 1. Furthermore, the test chamber 25 serves as a battery stage, and with the battery clamp 30, it allows for rapid replacement of coin cells or other commercially available X-ray transmission in-situ cells, significantly improving testing efficiency.

[0030] Reference Figure 10The rear cover plate 13 is provided with multiple functional interfaces, including a liquid inlet 134, a liquid outlet 135, a vent 136, a temperature monitoring interface 138, battery positive and negative terminals 137, and temperature control interfaces 139a and 139b. Temperature control interfaces 139a and 139b include a cooling control interface and a heating control interface. Since the housing 10 is a sealed structure, the vent 136 allows for vacuuming of the sealed housing 10, thereby reducing heat transfer between the heat-conducting stage 20 and the cavity 11, resulting in more accurate temperature control of the test tank 25 and the battery 50. Furthermore, vacuuming the housing 10 prevents condensation from freezing at low temperatures and affecting temperature control. Additionally, the vent 136 can also be used to replace the gas atmosphere for testing air batteries.

[0031] Reference Figures 7-9 The battery clamp 30 has a screw hole 312 in its first clamping body 31 for inserting a screw to connect the first clamping body 31 to the second clamping body 32. In this embodiment, an insulating material is provided inside and around the screw hole 312 to achieve insulation between the positive and negative terminals of the battery 50 when the first clamping body 31 and the second clamping body 32 are connected by screws, facilitating subsequent testing. In this embodiment, the insulating material inside and around the screw hole 312 is PEEK material. PEEK material is an ideal electrical insulator, maintaining good electrical insulation performance even under harsh working conditions such as high temperature, high pressure, and high humidity, thus enhancing the safety of the device.

[0032] The first clamping body 31 includes a light inlet hole 313 and a conductive protrusion 314, and the second clamping body 32 includes a light outlet hole 322 and a battery mounting slot 33. The battery mounting slot 33 is used to mount a battery 50. The conductive protrusion 314 abuts against the battery 50 mounted in the battery mounting slot 33.

[0033] The heat conduction stage 20 also includes a heat conduction stage cover plate 201. The side wall 24 of the test groove 25 extends radially to form an end face 28. The heat conduction stage cover plate 201 is installed on the end face 28 by screws, thereby installing the battery clamp 30 in the test groove 25. At this time, the battery clamp 30 is placed between the heat conduction stage body 21 and the heat conduction stage cover plate 201.

[0034] The heat-conducting platform 20 has multiple connection holes 27 around the temperature control surface 22. The heat-conducting platform 20 also includes a fixing clamp 43, which is locked to the connection holes 27 by screws, thereby attaching the temperature control component 40 to the temperature control surface 22 of the heat-conducting platform 20. A column 29 is provided between two adjacent temperature control surfaces 22; in this embodiment, a total of four columns 29 are provided. A locking plate 291 is provided at the end of the column 29 away from the temperature control surface 23. The edge of the temperature control surface 23 extends radially outward to form a flange structure 231. The locking plate 291 and the flange structure 231 are used to connect to the inner wall of the cavity 11. Specifically, the inner wall of the cavity 11 is provided with an annular flange 113 and multiple inner connecting plates 114. The multiple inner connecting plates 114 are distributed circumferentially along the inner wall of the cavity 11. The annular flange 113 is used to connect with the flange structure 231, and the inner connecting plates 114 are used to connect with the locking plate 291, thereby positioning and installing the heat-conducting stage 20 inside the cavity 11. Insulation cotton is installed between the heat-conducting stage 20 and the inner wall of the cavity 11, thereby improving the heat insulation performance between the heat-conducting stage 20 and the cavity 11, reducing heat transfer between them, and allowing for more accurate temperature control of the test tank 25 and the battery 50.

[0035] The front cover plate 12 includes a front cover plate body 121 and a light hole sealing plate 122. At least one sealing groove 123 is provided around the light hole C of the front cover plate body 121. The sealing groove 123 is used to place a sealing ring. A polyimide film is sandwiched between the front cover plate body 121 and the light hole sealing plate 122 and is fixed and sealed by screws.

[0036] The rear cover plate 13 includes a rear cover plate body 131 and a light hole sealing plate 132. At least one sealing groove 133 is provided around the light hole C of the rear cover plate body 131. The sealing groove 133 is used to place a sealing ring. A polyimide film is sandwiched between the rear cover plate body 131 and the light hole sealing plate 132 and is fixed and sealed by screws.

[0037] The cavity 11, the front cover 12, and the rear cover 13 are preferably made of aluminum alloy, which can reduce weight while maintaining structural strength.

[0038] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device, characterized in that, include: The housing includes a cavity, a front cover plate, a rear cover plate, and a bracket. The cavity is a cylindrical hollow structure with openings at the front and rear ends. The front cover plate and the rear cover plate are respectively sealed to the front and rear ends of the cavity. Both the front cover plate and the rear cover plate are provided with light holes that can transmit X-rays, and the light holes are sealed with X-ray-transmitting material. A heat-conducting stage is installed in a housing. The heat-conducting stage includes a main body with multiple temperature-controlling surfaces arranged in a polygonal enclosure. The main body also has a temperature-controlled surface located on one side of the polygonal enclosure. The temperature-controlled surface has a test slot with an X-ray-transmitting aperture on its bottom surface. A battery clamp is installed in a test slot to hold and mount a battery, and is provided with an electrode lead-out structure to bring out the positive and negative terminals of the battery; the battery clamp can provide the battery with an environmental field based on a preset temperature by means of the heat conduction stage; A temperature control component is attached to the temperature control surface of the heat conduction stage; the temperature control component is used to adjust the temperature of the test tank through heat conduction by the heat conduction stage. A temperature sensor is mounted on a heat-conducting stage and is used to monitor the temperature of the test tank. The functional interface is located on the housing and includes at least a venting interface, a temperature monitoring interface, a battery positive and negative terminal interface, and a temperature control interface.

2. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The main body of the heat conduction platform has four temperature control surfaces, two of which are adjacent to the other two, and are respectively arranged opposite to each other, so that the four temperature control surfaces form a rectangular enclosure structure; the temperature control surface is located on one side of the four rectangular enclosure temperature control surfaces, and the temperature control surface is perpendicular to the four temperature control surfaces.

3. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The battery clamp includes a first clamp body and a second clamp body. The battery clamp has a battery mounting slot for installing a battery. An insulating gasket is spaced between the first clamp body and the second clamp body. The first clamp body has a screw hole for inserting a screw to connect the first clamp body and the second clamp body. Insulating material is provided inside and around the screw hole.

4. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 3, characterized in that: The insulating material inside and around the screw hole is PEEK material; and / or, the insulating gasket is silicone material.

5. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The temperature control component includes a TEC heating and cooling element and a heat dissipation copper busbar; the TEC heating and cooling element is attached to the temperature control surface; the heat dissipation copper busbar is attached to the TEC heating and cooling element, and the heat dissipation copper busbar and the temperature control surface are respectively located on opposite sides of the TEC heating and cooling element, and the heat dissipation copper busbar is provided with a heat exchange fluid channel; the functional interface also includes a liquid inlet and a liquid outlet.

6. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The heat-conducting stage extends from the temperature-controlled surface and has a sidewall that encloses the test groove. The sidewall has a sensor mounting hole, and the temperature sensor is installed in the sensor mounting hole. The temperature sensor is a PT100 thermistor.

7. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: A column is provided between two adjacent temperature-controlled surfaces. A locking plate is provided at the end of the column away from the temperature-controlled surface. The edge of the temperature-controlled surface extends radially outward to form a flange structure. The inner wall of the cavity is provided with an annular flange and multiple inner connecting plates. The multiple inner connecting plates are distributed circumferentially along the inner wall of the cavity. The annular flange is used to connect with the flange structure, and the inner connecting plates are used to connect with the locking plate. Thermal insulation cotton is installed between the heat-conducting platform and the inner wall of the cavity.

8. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The front cover plate includes a front cover plate body and a light hole sealing plate. At least one sealing groove is provided around the light hole of the front cover plate body. The sealing groove is used to place a sealing ring. A polyimide film is sandwiched between the front cover plate body and the light hole sealing plate and is fixed and sealed by screws. The rear cover plate includes a rear cover plate body and a light hole sealing plate. At least one sealing groove is provided around the light hole of the rear cover plate body. The sealing groove is used to place a sealing ring. A polyimide film is sandwiched between the rear cover plate body and the light hole sealing plate and is fixed and sealed by screws.

9. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The heat conduction stage also includes a heat conduction stage cover plate, and the battery clamp is installed between the heat conduction stage body and the heat conduction stage cover plate; the heat conduction stage and the battery clamp are made of copper; the battery is a button cell assembled from positive and negative electrode shells and the sample to be tested, and both the positive and negative electrode shells of the battery have openings and are sealed with polyimide film.

10. The wide-temperature-range electrochemical in-situ X-ray absorption spectroscopy testing device according to claim 1, characterized in that: The cavity, the front cover, and the rear cover are made of aluminum alloy; and / or the X-ray permeable material is a polyimide film.

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