In-situ X-ray testing system suitable for commercial battery under multi-field coupling

Abstract

The invention discloses an in-situ X-ray testing system suitable for a commercial battery under multi-field coupling, the in-situ X-ray testing system comprises a multi-field in-situ reaction device and an X-ray device, the X-ray device comprises an X-ray source, a detector and a sample support, the sample support is connected with the multi-field in-situ reaction device, and the axes of the X-ray source, the multi-field in-situ reaction device and the detector are coaxial. In the invention, the phase structure change information of the internal material and structure of the battery can be realized through the X-ray source, the deformation of the microstructure, the interface evolution and the possible gas generation behavior in the charging and discharging process can be accurately captured, the external stress-strain information can be measured through the multi-field in-situ reaction device, and the external stress-strain information and the external stress-strain information are combined. Synchronous detection of internal structure change and external stress-strain information of the soft package battery is realized, and the limitation of single-dimensional representation in the traditional technology is broken through.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ characterization of integrated material structure and properties, and more particularly to an in-situ X-ray test system for commercial batteries under multi-field coupling. Background Art

[0002] As a core technology in the current energy storage field, commercial soft-pack batteries have been widely used in fields such as electric vehicles and renewable energy storage. However, their complex multi-physical-field coupling effects and failure mechanisms have long been the focus and difficulty of academic research and industrial development. During the charge and discharge process of the battery, significant volume changes will occur, accompanied by the superposition of thermal effects, electrochemical reactions, and mechanical stresses. This multi-field coupling makes the material behavior and structural changes inside the battery extremely complex. In the actual working environment, the change of the temperature field will significantly affect the chemical reaction rate, material properties, and mechanical performance of the battery. Especially for the soft-pack battery system with flexible packaging characteristics, its thermal expansion, gas generation, and internal structure evolution are more obvious. These problems not only directly relate to the performance and cycle life of the battery but also have an important impact on its thermal runaway risk. Therefore, studying the mechanical and structural behaviors of soft-pack batteries under different temperature fields is not only the key to understanding their failure mechanisms but also the basis for optimizing design and improving safety. At present, the research on the multi-physical-field behavior of batteries mainly relies on means such as electrochemical characterization, thermal analysis, and finite element simulation. However, these technologies have significant deficiencies in describing the correlation between the internal structural changes and external mechanical behaviors of the battery. Electrochemical characterization methods mainly focus on macroscopic performance parameters such as capacity and internal resistance, and cannot directly reveal the deformation and structural changes of the materials inside the battery during the dynamic charge and discharge process. Thermal analysis means such as infrared thermal imaging can capture the external temperature distribution, but it is difficult to quantify the non-uniformity of the internal temperature field of the battery and the specific effect of temperature on the structure and stress. Finite element simulation depends on the input of material constitutive models and experimental data, and its results are highly sensitive to modeling assumptions and have low reliability in the absence of high-precision experimental verification. In addition, for soft-pack batteries, the flexibility of their packaging materials and the complexity of their internal multi-layer structures make it difficult for traditional rigid battery models to accurately describe their true mechanical behaviors.

[0003] The existing technologies have obvious deficiencies in studying the stress-strain and internal structure evolution of commercial soft-pack batteries. First, in the study of the multi-physical field behavior of batteries, traditional electrochemical characterization methods can only provide macroscopic performance data such as capacity and internal resistance, lacking an intuitive description of the internal dynamic microstructure changes of the battery, and it is difficult to reveal the mechanical behavior and material deformation characteristics during charge and discharge. Second, although thermal analysis methods such as infrared imaging can capture the external temperature distribution of the battery, it is difficult to accurately depict the internal temperature gradient and its specific impact on the structure and stress. Especially under complex temperature fields and multi-cycle charge and discharge conditions, its resolution and accuracy are significantly limited. In addition, although finite element simulation technology has certain advantages in predicting material behavior, it highly depends on input data and model assumptions, and in complex thermo-mechanical-electrical coupling problems, it cannot completely replace experimental verification. For the characterization of mechanical behavior, traditional contact displacement measurement and visual monitoring methods have limited accuracy and lack real-time description of dynamic behavior. Especially, it is difficult to correlate external mechanical information with internal structure changes, and this disconnection limits the in-depth understanding of battery failure mechanisms and performance evolution. In the special system of soft-pack batteries, its flexible packaging materials and complex internal multi-layer structures make the characterization and modeling methods of traditional rigid batteries even more insufficient, and it is impossible to accurately describe their real mechanical behavior under different temperature fields. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to realize the synchronous measurement of stress and X-ray spectrum during the electrochemical reaction process of soft-pack batteries under different temperature or pressure field conditions.

[0005] The present invention solves the above technical problem through the following technical means: An in-situ X-ray test system applicable to commercial batteries under multi-field coupling, including a multi-field in-situ reaction device and an X-ray device. The X-ray device includes an X-ray source, a detector, and a sample holder. The sample holder is connected to the multi-field in-situ reaction device. The axes of the X-ray source, the multi-field in-situ reaction device, and the detector are coaxial. The X-ray source and the detector can rotate around the sample holder to realize the X-ray test function of the sample. A light passing hole is opened at the center of the multi-field in-situ reaction device. The light emitted by the X-ray source can pass through the light passing hole, pass through the test piece fixed on the multi-field in-situ reaction device, and be emitted to the detector. The X-ray source and the detector can also move relative to the multi-field in-situ reaction device. The multi-field in-situ reaction device can measure the stress and strain of the test piece. The multi-field in-situ reaction device is also provided with a heating element, and the heating element can adjust the temperature of the test piece.

[0006] The multi-field in-situ reaction device includes a battery pressing plate, a heating plate, a spring pressing plate, and a sensor fixing plate connected in sequence to realize the regulation of the temperature field and pressure field of the soft-pack battery. The heating plate forms the heating element. The connecting plate is elastically connected to the spring pressing plate through an elastic connecting member. The battery pressing plate, the heating plate, the spring pressing plate, and the sensor fixing plate are connected by fixing screws. One end of the fixing screw extending out of the sensor fixing plate is connected and fastened to the sensor fixing plate through a locking nut. A pressure sensor is provided between the spring pressing plate and the sensor fixing plate.

[0007] As a preferred technical solution, it further includes a rotating table and a driving member. The output end of the driving member is in transmission connection with the rotating table. The X-ray source and the detector are respectively connected to both ends of the rotating table through position adjustment tables in an adjustable manner.

[0008] As a preferred technical solution, the sample holder is fixedly connected to the center position of the rotating table and is located between the X-ray source and the detector. The driving member can drive the X-ray source and the detector to rotate around the axis of the sample holder.

[0009] As a preferred technical solution, the detector is an XRD detector or a CT panel detector.

[0010] As a preferred technical solution, an installation groove adapted to the pressure sensor is provided on the sensor fixing plate, and a battery installation groove is provided at one end of the battery pressing plate facing the heating plate.

[0011] As a preferred technical solution, the multi-field in-situ reaction device further includes a fixing bracket. The fixing bracket is fixedly connected to the heating plate, and a heating interface is fixedly connected to the fixing bracket. The heating interface is electrically connected to the heating plate.

[0012] As a preferred technical solution, the position adjustment table includes a position adjustment table 1 and a position adjustment table 2. The X-ray source is connected to one end of the rotating table through the position adjustment table 1, and the detector is connected to the other end of the rotating table through the position adjustment table 2.

[0013] As a preferred technical solution, a counterweight 2 is provided on the rotating table, and a counterweight 1 is provided on the top of the driving member.

[0014] As a preferred technical solution, screw installation holes adapted to the fixing screws are provided on the battery pressing plate, the heating plate, the spring pressing plate, and the sensor fixing plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) In the present invention, the X-ray source can be used to obtain information on the phase structure changes of the internal materials and structures of the battery, and can accurately capture the deformation of the microstructure, the interface evolution, and the possible gas generation behavior during the charge and discharge process. By using a multi-field in-situ reaction device, the external stress and strain information can be measured. By combining the two, the synchronous detection of the internal structure changes and the external stress and strain information of the soft-pack battery is achieved, breaking through the limitation of the single-dimensional characterization of traditional technologies. At the same time, through the setting of the heating element and the stress measurement device, the synchronous testing of the stress and X-ray spectrum during the electrochemical reaction of the soft-pack battery is realized under the conditions of controllable temperature field and controllable pressure field. By using X-ray technology, the dynamic changes of the internal materials and interface morphology of the battery caused by temperature are deeply analyzed, and combined with the data of the pressure sensor, how temperature changes trigger the change of mechanical behavior and possible failure modes are systematically revealed. This research can directly serve the optimal design of the battery thermal management system, improving the working reliability and safety of the soft-pack battery under extreme temperature fields; through the collaborative application of multiple technical means, the refined and multi-dimensional characterization of the performance and failure mechanism of commercial soft-pack batteries is realized, which has significantly improved in terms of accuracy, real-time performance, and comprehensiveness compared with the existing technology, providing effective technical support for solving the reliability, safety, and lifespan problems of soft-pack batteries under complex working conditions. At the same time, this research method also provides an important technical foundation and data support for the research and development of subsequent high-energy density batteries, new battery materials, and packaging designs.

[0017] (2) In the present invention, through high-resolution X-ray imaging technology, the fine changes in the microstructure of the battery during the charge and discharge process can be captured in real time, such as electrode deformation, internal gas generation, and the dynamic evolution of the electrode-electrolyte interface, providing an experimental basis for revealing the physical mechanisms behind the structural changes. In addition, the existing technologies for the study of mechanical stress and strain usually adopt contact displacement measurement or visual monitoring, which show obvious limitations in flexible-packaged soft-pack batteries due to limited resolution and insufficient real-time performance, especially difficult to reflect the dynamic changes of mechanical behavior under complex temperature fields and electrochemical reaction conditions.

[0018] (3) In the present invention, through a high-precision external pressure sensor, the stress and strain changes of the battery under different temperature fields and charge-discharge conditions can be monitored in real time, providing accurate data support for the thermo-mechanical-electrical coupling behavior, and being able to effectively quantify the correlation between external mechanical behavior and internal structural changes, overcoming the problem of the disconnection between traditional mechanical characterization means and internal dynamic structure observation. This cross-scale correlation study can reveal the internal connection between the mechanical and electrochemical properties of the battery under real working conditions, providing more comprehensive guidance for the optimization design and performance improvement of the battery. At the same time, the special behavior of the soft-pack battery under different temperature fields is particularly studied. In the existing technology, the comprehensive influence of the temperature field on the internal and external behaviors of the battery is less studied, usually only discussed through surface temperature measurement or limited thermal analysis tools, lacking an accurate description of the internal temperature distribution of the battery and its influence on the stress field and structural evolution. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic front view structure diagram provided by an embodiment of the present invention;

[0021] Figure 3 It is a schematic sectional structure diagram provided by an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of imaging data provided by an embodiment of the present invention;

[0023] Reference numerals in the drawings: 1, fixed bracket; 2, heating interface; 3, compression spring; 4, fixing screw; 5, battery pressing plate; 6, heating plate; 7, spring pressing plate; 8, sensor fixing plate; 9, pressure sensor; 10, lock nut; 11, X-ray source; 12, detector; 13, rotating table; 14, position adjustment table 1; 15, sample bracket; 16, position adjustment table 2; 17, counterweight 1; 18, counterweight 2; 19, light passing hole. Detailed Embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Refer to Figure 1, An in-situ X-ray testing system applicable to commercial batteries under multi-field coupling, comprising a multi-field in-situ reaction device, an X-ray device, a rotating table 13, and a driving member. The output end of the driving member is fixedly connected to the rotating table 13. The driving member can drive the rotating table 13 to rotate with its axis as the rotation axis. An X-ray device is provided outside the multi-field in-situ reaction device. The X-ray device includes an X-ray source 11, a detector 12, and a sample holder 15. The bottom of the driving member is also fixedly connected to the sample holder 15. The sample holder 15 is fixedly connected to the multi-field in-situ reaction device by bolts. The X-ray source 11 is adjustably connected to one side of the rotating table 13 through a position adjustment stage 14, and the detector 12 is adjustably connected to the other side of the rotating table 13 through a position adjustment stage 16. Among them, the position adjustment stage 14 and the position adjustment stage 16 can be commercial displacement stages or linear modules in the prior art, which are components that enable the detector 12 to move forward and backward, left and right to meet different resolution requirements;

[0026] The X-ray source 11 needs to penetrate the commercial soft-pack battery and simultaneously meet the requirements of X-ray detection functions, such as obtaining X-ray diffraction information and imaging information. In this embodiment, the selected X-ray source 11 needs to meet the requirements of a maximum operating tube voltage ≥ 50 KV and a focal spot size ≤ 100 μm. An imported commercial micro-focus X-ray machine can be selected, such as the German wor X-ray machine; according to the requirements of X-ray detection signals, such as XRD and CT imaging functions, the detector 12 is selected as a two-dimensional area detector with small pixels or a corresponding CCD camera; the test piece is a commercial battery or a commercial battery, such as a commercial soft-pack battery, etc.;

[0027] In this embodiment, the multi-field in-situ reaction device is fixedly connected to the central position of the rotating table 13. The rotating table 13 can drive the X-ray source 11 and the detector 12 to rotate with the axis of the sample holder 15 as the rotation axis. The axes of the X-ray source 11, the multi-field in-situ reaction device, and the detector 12 are coaxial. The 180° linear arrangement can ensure the completion of X-ray functions, such as XRD and X-ray CT imaging functions; through the sample holder 15, on the one hand, the multi-field in-situ reaction device can be fixed to ensure that the test sample is at the origin of the test and guarantee the test effect; on the other hand, the 360° rotation of the X-ray source 11 and the detector 12 can also be realized through the rotating table 13, so as to obtain various X-ray signals of the sample at different angles.

[0028] Refer to Figure 2 、 Figure 3The multi-field in-situ reaction device comprises a fixed bracket 1, a heating interface 2, a compression spring 3, a fixing screw 4, a battery pressure plate 5, a heating plate 6, a spring pressure plate 7, a sensor fixing plate 8, a pressure sensor 9, and a locking nut 10. The compression spring 3, the battery pressure plate 5, the heating plate 6, the spring pressure plate 7, the sensor fixing plate 8, and the fixing screw 4 constitute a battery pressing member, and the battery pressing member is used to fix the battery. The pressure sensor 9 is located on the extrusion path of the battery pressing member. The heating interface 2 is fixedly connected to the fixed bracket 1, and the heating plate 6 is fixedly connected to the end of the fixed bracket 1 away from the rotating table 13. A plurality of fixing screws 4 are fixedly connected to the heating plate 6. In this embodiment, four are taken as an example and are distributed in a rectangular shape. The head end of the fixing screw 4 is located at the end of the heating plate 6 facing the X-ray source 11. A battery pressure plate 5 is also provided on the side of the heating plate 6 facing the X-ray source 11. The fixing screw 4 penetrates the battery pressure plate 5. The fixing screw 4 The head is against the battery pressure plate 5 and the heating plate 6. The end of the heating plate 6 facing the detector 12 is also provided with a spring pressure plate 7 and a sensor fixing plate 8. The heating plate 6 is elastically connected to the spring pressure plate 7 through a compression spring 3. In this embodiment, four compression springs 3 are provided. The pressure sensor 9 is located between the spring pressure plate 7 and the sensor fixing plate 8. An installation groove adapted to the pressure sensor 9 is provided between the sensor fixing plates 8. The fixing screw 4 passes through the spring pressure plate 7 and the sensor fixing plate 8. One end of the fixing screw 4 passes through the sensor fixing plate 8 and is connected and fastened to the sensor fixing plate 8 through a locking nut 10. The compression spring 3 is located on the outside of the fixing screw 4. The compression spring 3 is mainly used to transmit the pressure change of the soft-pack battery to form an elastic connecting part. The battery pressure plate 5, the heating plate 6, the spring pressure plate 7, and the sensor fixing plate 8 are all provided with a light-through hole 19 at the center. In this embodiment, the light-through hole 19 is a round hole with a diameter of 8 mm.

[0029] The material of the fixing bracket 1 is aluminum alloy, titanium alloy or stainless steel, but not limited thereto. The heating plate 6 is made of aluminum alloy or titanium alloy. In order to prevent short circuit caused by contact with the positive and negative poles of the battery, such metal materials also need to be externally insulated, such as coating with a polymer layer. The heating plate 6 is made of commercially available heating resistor wire. A temperature measuring element is also provided in the heating plate 6 to enable it to respond promptly to the temperature of the soft-pack battery. The temperature adjustment range of the heating plate 6 is from room temperature to 150 degrees.

[0030] A battery mounting groove is provided at one end of the battery pressing plate 5 facing the heating plate 6. The battery pressing plate 5 is made of the same material as the heating plate 6 and is insulated on the outer surface to further ensure that the contact surface with the battery is flat and smooth. The pressure monitoring of the soft-pack battery during the electrochemical charging and discharging process is detected by the pressure sensor 9, wherein the spring pressing plate 7 and the sensor fixing plate 8 are both made of rigid structural materials, such as stainless steel or titanium alloy. The pressure sensor 9 can be connected to the pressure control line to display the pressure value in real time, and can also be further connected to the computer software to realize the recording of the pressure measurement data.

[0031] Refer to Figure 1 , a second counterweight 18 is fixedly connected to the rotating table 13, and a first counterweight 17 is fixedly connected to the top of the driving member.

[0032] Usage method: First, place the soft-pack battery in the corresponding battery installation groove of the battery pressing plate 5 to ensure that the position of the battery does not shift; then install the four fixing screws 4 of the device in the screw installation holes on the battery pressing plate 5 and the heating plate 6. At the other end of the heating plate 6, put four pressing springs 3 on the fixing screws 4. After completing this step, place the pressure sensor 9 in the groove between the spring pressing plate 7 and the sensor fixing plate 8, install the spring pressing plate 7, the pressure sensor 9, and the sensor fixing plate 8, and make them sleeved on the four fixing screws 4. Adjust the positions of the fixing screws 4, the spring pressing plate 7, and the sensor fixing plate 8, then install the lock nuts 10 on the fixing screws 4 and tighten them with a wrench to apply a certain initial pressure to the battery; finally, install the multi-field in-situ reaction device on the rotating end of the rotating table 13, connect the heating extension wire to the temperature control box and the sensor control wire to the pressure control box, apply a certain temperature environment field, turn on the battery tester, and realize the synchronous stress data acquisition during the charge and discharge process of the battery under different temperature environments and the X-ray related detection results of the battery materials and conduct analysis. If it is an XRD detector, the in-situ XRD data of the battery will be collected; if it is a CT panel detector, the imaging data of the battery will be collected.

[0033] This application has significant beneficial effects compared with the prior art, which are mainly reflected in improving the depth and accuracy of the research on the performance and failure mechanism of commercial soft-pack batteries under multi-physical field coupling conditions.

[0034] By combining the X-ray characterization technology with the pressure sensor 9, the synchronous detection of the internal structure changes and external stress and strain information of the soft-pack battery is realized, breaking through the limitation of the single-dimensional characterization of traditional technologies. In the prior art, although the electrochemical characterization method can reflect the capacity decay and electrochemical performance changes of the battery, it lacks the direct observation ability of microscopic deformation, material interface behavior, and internal structure dynamic changes; while the finite element simulation results are highly dependent on the input parameters and model assumptions, and it is difficult to reliably describe complex coupling scenarios without experimental verification.

[0035] Through high-resolution X-ray imaging technology, namely the X-ray source 11, the fine changes in the microstructure of the battery during charge and discharge can be captured in real time, such as electrode deformation, internal gas generation, and the dynamic evolution of the electrode-electrolyte interface, providing an experimental basis for revealing the physical mechanisms behind the structural changes. In addition, existing technologies for studying mechanical stress and strain usually use contact displacement measurement or visual monitoring. These methods show obvious limitations in flexible-packaged pouch cells due to limited resolution and insufficient real-time performance, and it is particularly difficult to reflect the dynamic changes in mechanical behavior under complex temperature fields and electrochemical reaction conditions.

[0036] Through the high-precision pressure sensor 9, the stress and strain changes of the battery under different temperature fields and charge-discharge conditions can be monitored in real time, providing accurate data support for thermo-mechanical-electrical coupling behavior, and being able to effectively quantify the correlation between external mechanical behavior and internal structural changes, overcoming the problem of the disconnection between traditional mechanical characterization means and internal dynamic structure observation.

[0037] This cross-scale correlation study can reveal the internal relationship between the mechanical and electrochemical properties of the battery under real working conditions, providing more comprehensive guidance for the optimization design and performance improvement of the battery. At the same time, the special behavior of pouch cells under different temperature fields is particularly studied. In the existing technology, the comprehensive influence of the temperature field on the internal and external behaviors of the battery is less studied, and it is usually only discussed through surface temperature measurement or limited thermal analysis tools, lacking an accurate description of the internal temperature distribution of the battery and its influence on the stress field and structural evolution.

[0038] Through X-ray technology, the dynamic changes in the internal materials and interface morphology of the battery caused by temperature are deeply analyzed, and combined with the data of the pressure sensor 9, it systematically reveals how temperature changes trigger changes in mechanical behavior and possible failure modes. This study can directly serve the optimization design of the battery thermal management system, improving the working reliability and safety of pouch cells under extreme temperature fields. The refined and multi-dimensional characterization of the performance and failure mechanism of commercial pouch cells is realized, and there are significant improvements in accuracy, real-time performance, and comprehensiveness compared with the existing technology, providing effective technical support for solving the reliability, safety, and life problems of pouch cells under complex working conditions. At the same time, this research method also provides an important technical foundation and data support for the subsequent research and development of high-energy-density batteries, new battery materials, and packaging designs.

[0039] When the detector is an XRD detector, a group of commercial soft-pack batteries with a high-nickel cathode and a silicon-carbon anode are selected as the test piece, and the number of electrode layers is selected to be 3 layers for case analysis. The above soft-pack battery is placed between the battery pressure plate 5 and the heating plate 6 of the multi-field in-situ reaction test device, and is locked and a certain pressure is applied through the lock nut 10. The initial pressure value is set to 420 N; then the multi-field in-situ reaction device is fixed to the sample holder 15 of the X-ray device, so that the X-ray source 11, the in-situ reaction device and the detector 12 are arranged in a straight line. The positive and negative electrodes of the soft-pack battery are connected to the BlueTEC test system through electrode wires to ensure the charge and discharge behavior of the battery. Then, the pressure sensor 9, the heating plate 6, and the heating interface 2 of the in-situ reaction device are connected to an external controller through connection wires to ensure the control of the pressure field and temperature field parameters of the battery. After all the circuit connections are completed, the controllers of the X-ray source 11, the detector 12, and the in-situ reaction device are turned on, and the system automatically focuses to ensure that the ray source, the soft-pack battery, and the detector are on the same horizontal plane, and the temperature and the surface pressure value of the battery are started to be recorded; the BlueTEC test system is turned on, the charge and discharge parameters of the battery are set, and the electrochemical reaction is started to make the battery operate under the condition of 0.5C. The XRD and the stress value change of the battery are synchronously tested. The results are as Figure 4 shown. The charge-discharge curve of the battery under the condition of 0.5C is shown on the far left. The middle spectrogram shows the change of the XRD spectrogram of the soft-pack battery under the condition of 0.5C. The stress change of the whole battery is shown on the far right. It can be seen that the stress structure change of the battery is highly consistent with its charge-discharge curve, indicating that during the operation of the commercial battery, its external stress change is consistent with the lithium-ion insertion and extraction behavior during the electrochemical reaction process. The change trend of the middle XRD spectrogram further verifies the above experimental results from the aspect of the electrode material composition inside the battery. The position of the XRD peak of the high-nickel electrode shows regular back-and-forth displacement as the charge-discharge reaction progresses, while the position of the XRD peak of the carbon anode material changes in the layer spacing distance with the lithium-ion insertion and extraction behavior; by effectively coupling the change of the electrode material phase structure inside the battery and the stress change of the whole battery with the electrochemical reaction process, it will provide important clues and experimental basis for researchers to deeply analyze the battery failure behavior or the battery safety operation strategy.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An in-situ X-ray testing system for commercial batteries under multi-field coupling, characterized in that: It includes a multi-field in-situ reaction device and an X-ray device. The X-ray device includes an X-ray source, a detector, and a sample holder. The sample holder is connected to the multi-field in-situ reaction device. The axes of the X-ray source, the multi-field in-situ reaction device, and the detector are coaxial. The X-ray source and the detector can rotate around the sample holder as the center of a circle. A light hole is opened at the center of the multi-field in-situ reaction device. The light emitted by the X-ray source can pass through the light hole and pass through the workpiece to be tested fixed on the multi-field in-situ reaction device and then be emitted to the detector. The X-ray source and the detector can also move relative to the multi-field in-situ reaction device. The multi-field in-situ reaction device can measure the stress and strain of the workpiece to be tested. The multi-field in-situ reaction device is also provided with a heating element, and the heating element can adjust the temperature of the workpiece to be tested.

2. An in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 1, characterized in that: The multi-field in-situ reaction device includes a battery pressure plate, a heating plate, a spring pressure plate, and a sensor fixing plate which are connected in sequence. The heating plate forms the heating element. The connecting plate is elastically connected to the spring pressure plate through an elastic connecting element. The battery pressure plate, the heating plate, the spring pressure plate, and the sensor fixing plate are connected through fixing screws. One end of the fixing screw extending out of the sensor fixing plate is connected and fastened to the sensor fixing plate through a locking nut. A pressure sensor is provided between the spring pressure plate and the sensor fixing plate.

3. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 1, characterized in that: It also includes a rotating table and a driving member, wherein the output end of the driving member is drivingly connected to the rotating table, and the X-ray source and the detector are respectively adjustable and connected to the two ends of the rotating table through a position adjustment table.

4. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 3, characterized in that: The sample holder is fixedly connected to the center of the rotating table and is located between the X-ray source and the detector. The driving member can drive the X-ray source and the detector to rotate with the axis of the sample holder as the rotating axis.

5. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 1, characterized in that: The detector is an XRD detector or a CT panel detector.

6. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 2, characterized in that: The sensor fixing plate is provided with a mounting groove matched with the pressure sensor, and the battery pressing plate is provided with a battery mounting groove at one end facing the heating plate.

7. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 2, characterized in that: The multi-field in-situ reaction device also includes a fixed bracket, which is fixedly connected to the heating plate. A heating interface is fixedly connected to the fixed bracket, and the heating interface is electrically connected to the heating plate.

8. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 3, characterized in that: The position adjustment platform 1 includes a position adjustment platform 1 and a position adjustment platform 2, the X-ray source is connected to one end of the rotating platform through the position adjustment platform 1, and the detector is connected to the other end of the rotating platform through the position adjustment platform 2.

9. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 3, characterized in that: The rotating platform is provided with a second counterweight body, and the top of the driving member is provided with a first counterweight body.

10. The in-situ X-ray testing system for commercial batteries under multi-field coupling according to claim 2, characterized in that: The battery pressing plate, the heating plate, the spring pressing plate and the sensor fixing plate are provided with screw mounting holes matched with the fixing screws.

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