A CT-DEMS combined aqueous battery in-situ detection device and method

Abstract

The present invention relates to an in-situ detection device and method for aqueous batteries combined with CT-DEMS, comprising: an in-situ detection unit comprising a fixed cover, a rotatable shell, a battery shell and a base arranged in series, the fixed cover being located above the rotatable shell and rotating relative to it, and the battery shell being detachably connected to the rotatable shell and the base respectively; a CT imaging unit comprising an X-ray generator and a flat-panel detector, a liftable and rotatable platform being arranged between the X-ray generator and the flat-panel detector, the in-situ detection unit being located on the liftable and rotatable platform, the gas generated by the battery to be detected flowing through the rotatable shell and the fixed cover and being discharged to the DEMS system through a first opening, while the liftable and rotatable platform drives the base to rotate and drives the battery shell and the rotatable shell to rotate together, while the fixed cover connected to the DEMS system remains stationary, the X-ray radiation source emitted by the X-ray generator penetrates the rotating battery shell and reaches the flat-panel detector, so as to image and monitor the structural changes of the battery to be detected.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a CT-DEMS combined aqueous battery in-situ detection device and method. Background Art

[0002] With the rapid development of new secondary battery technologies such as zinc-ion batteries, calcium-ion batteries, and potassium-ion batteries, particularly in the field of aqueous battery research, the need for optimizing electrolytes, electrode materials, and their interfacial properties has become increasingly prominent. Among them, alkaline aqueous nickel-zinc batteries have attracted widespread attention due to their broad application prospects, low cost, and high safety, especially their stable charge-discharge performance at low temperatures. However, this battery system still faces several key challenges. First, in alkaline aqueous nickel-zinc batteries, the commonly used alkaline electrolyte causes zinc deposition at the charging site during charging, leading to changes in electrode morphology and dendrite growth after continuous cycling. Zinc dendrites can penetrate the separator and short-circuit the battery. Second, the hydrogen evolution side reaction that may occur at the zinc anode during charging and discharging not only increases internal battery pressure but also produces hydrogen bubbles that can block ion transport channels, resulting in low coulombic efficiency. Furthermore, as the electrochemical reaction continues, zinc deposition in the electrolyte, hydrogen evolution reactions, and electrolyte supersaturation can form a zinc oxide passivation layer on the unreacted zinc surface. This passivation layer will hinder ion exchange at the electrode-electrolyte interface, resulting in low zinc electrode utilization and further affecting the battery's charge and discharge performance. Therefore, the development of a new in-situ detection device for aqueous batteries that can monitor the internal state of aqueous batteries under different operating conditions, including the formation process of dendrites, gas production, and its relationship with key parameters such as temperature and voltage, is an urgent problem that needs to be solved. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the first purpose of the present invention is to provide an in-situ detection device for aqueous batteries combined with CT-DEMS, including an in-situ detection unit and a CT imaging unit, which performs X-ray computed tomography imaging on the aqueous batteries during the charging and discharging process under in-situ working conditions, and is used in conjunction with the DEMS system to monitor the gas production during the process, thereby realizing in-situ real-time detection of the aqueous battery structure and gas production.

[0004] The second purpose of the present invention is to provide a combined CT-DEMS in-situ detection method for aqueous batteries, in which the gas produced by the battery to be detected is conducted to the DEMS system within the in-situ detection unit, and at the same time, the in-situ detection unit is driven to rotate by the CT imaging unit and emits an X-ray radiation source to penetrate the battery to be detected, thereby detecting changes in the battery structure in real time.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A combined CT-DEMS aqueous battery in-situ detection device comprises: an in-situ detection unit, the in-situ detection unit comprising a fixed cover, a rotatable shell, a battery shell and a base arranged in series, wherein the rotatable shell is located below the fixed cover and rotates relative to the fixed cover, the upper portion of the fixed cover has a first opening in fluid communication with an external DEMS system, and the bottom portion has a second opening in fluid communication with the internal fluid of the rotatable shell, the battery shell is detachably connected to the rotatable shell and the base respectively, the rotatable shell has a first conductor inside, the base has a second conductor inside, a battery accommodating chamber is defined in the battery shell between the first conductor and the second conductor, and the batteries to be detected in the battery accommodating chamber are respectively connected to the first conductor The body and the second conductor are conductive; a CT imaging unit, the CT imaging unit includes an X-ray generator and a flat panel detector arranged relatively to each other, a liftable rotatable platform is configured between the X-ray generator and the flat panel detector, the in-situ detection unit is located on the liftable rotatable platform, wherein the gas generated by the battery to be detected flows through the rotatable shell and the fixed cover and is discharged to the DEMS system through the first opening, and at the same time the liftable rotatable platform drives the base to rotate and drives the battery shell and the rotatable shell to rotate together, while the fixed cover connected to the DEMS system remains stationary, and the X-ray radiation source emitted by the X-ray generator penetrates the rotating battery shell and reaches the flat panel detector to image and monitor the structural changes of the battery to be detected.

[0007] Furthermore, a bearing is configured in the second opening, and the fixed cover body is rotatably connected to the rotatable shell through the bearing. A first fluid channel is configured inside the fixed cover body, and the first opening is connected to the second opening through the first fluid channel. The first conductor has a penetrating second fluid channel, and the second fluid channel is respectively connected to the first fluid channel and the battery accommodating cavity fluid.

[0008] Furthermore, the bottom of the base is also configured with a semiconductor for transferring heat or cold to the second conductor, and the outside of the in-situ detection unit is configured with a heating module and a cooling module, and the semiconductor is respectively connected to the heating module and the cooling module circuit.

[0009] Furthermore, the detection temperature of the in-situ detection unit is -60 to 120°C.

[0010] Furthermore, an electrochemical workstation is configured outside the in-situ detection unit, and the electrochemical workstation is connected to the first conductor and the second conductor circuits respectively through wires.

[0011] Furthermore, a first pole piece and a second pole piece are arranged in the battery housing, a flange is provided on the circumferential wall of the upper part of the battery housing, the first pole piece is placed on the flange and abuts the bottom of the first conductor, the second pole piece is located at the bottom of the battery housing and abuts the top of the second conductor, and the space between the first pole piece and the second pole piece is filled with electrolyte.

[0012] Furthermore, an annular groove is circumferentially provided at the edge of the top of the second conductor, and a sealing ring is disposed on the annular groove for sealing the joint between the second conductor and the battery housing.

[0013] Furthermore, the battery housing is made of PEEK.

[0014] Furthermore, the first conductor and the second conductor are both made of stainless steel.

[0015] According to the method using the above-mentioned aqueous battery in-situ detection device combined with CT-DEMS, the method includes the following steps:

[0016] The battery to be tested is placed in the battery accommodating cavity of the in-situ detection unit, and the battery to be tested is connected to the first conductor and the second conductor respectively; the first conductor and the second conductor are made conductive through the electrochemical workstation, so that the gas generated by the battery to be tested flows through the rotatable shell and the fixed cover and is discharged from the first opening to the DEMS system for mass spectrometry analysis; the liftable rotating platform is driven to rotate the base, and the battery shell and the rotatable shell are driven to rotate together, while the fixed cover connected to the DEMS system remains stationary, and at the same time, the X-ray generator emits an X-ray radiation source that penetrates the battery shell and reaches the flat-panel detector to obtain a CT image of the structural changes of the battery to be tested.

[0017] The present invention has the following advantages:

[0018] The present invention presents a combined CT-DEMS in-situ detection device for aqueous batteries. This device performs X-ray computed tomography (X-ray CT) characterization of aqueous batteries during charge and discharge under in-situ operating conditions and is coupled with in-situ differential electrochemical mass spectrometry (DEMS) technology to monitor gas production during the process. During testing, the device can adapt to the requirements of electrolytes with varying pH levels, performing in-situ X-ray computed tomography (XCT) characterization of aqueous batteries under non-destructive conditions. It also successfully addresses the impact of sample uniformity on the characterization results during XCT characterization. During testing, the in-situ detection unit rotates synchronously with a liftable rotating platform, driving the base, battery housing, and rotatable housing to allow imaging of the battery at various angles and positions, providing a comprehensive view of battery structural changes. Importantly, the fixed cover connected to the DEMS system remains stationary throughout the rotation process, ensuring that the fixed cover does not move with the rotation of the liftable rotating platform, thereby ensuring that gas production can be continuously and accurately monitored by the DEMS system. This not only improves monitoring efficiency but also enhances the mechanical stability of the entire system, reducing errors caused by vibration or movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the aqueous battery in-situ detection device combined with CT-DEMS of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the in-situ detection unit of the present invention.

[0021] Figure 3 It is a three-dimensional exploded view of the in-situ detection unit of the present invention.

[0022] Figure 4 It is a cross-sectional view of the in-situ detection unit of the present invention.

[0023] Figure 5 It is a schematic flow chart of the aqueous battery in-situ detection device combined with CT-DEMS of the present invention.

[0024] Among them, 1 is the in-situ detection unit, 101 is the fixed cover, 101a is the first opening, 101b is the second opening, 101c is the bearing, 101d is the first fluid channel, 102 is the rotatable shell, 102a is the first conductor, 102b is the second fluid channel, 102c is the first wire hole, 103 is the battery shell, 103a is the battery accommodating cavity, 103b is the first pole piece, 103c is the second pole piece, 103d is the flange, 104 is the base, 104a is the second conductor, 104b is the annular groove, 104c is the sealing ring, 104d is the second wire hole, 2 is the CT imaging unit, 201 is the X-ray generator, 202 is the flat panel detector, 203 is the liftable and rotatable platform, 3 is the DEMS system, 4 is the electrochemical workstation, 5 is the semiconductor, 6 is the cooling module, and 7 is the heating module. DETAILED DESCRIPTION

[0025] The following description is essentially only exemplary and is not intended to limit the present invention, its application, or use. It will be further understood that the terms "comprise" and / or "comprising" specify the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but do not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or their groups or add one or more other features, wholes, steps, operations, elements, parts and / or their groups. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, parts or part discussed below can be referred to as the second element, parts or part without departing from the teaching of the present invention. Unless otherwise defined, all terms used in this article (including technical terms and scientific terms) have the same meaning as those of ordinary skill in the art to which the present invention belongs. It will be further understood that the terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with its meaning in the relevant field and / or this specification context, and will not be interpreted in an idealized or too formal sense, unless clearly defined as such herein.

[0026] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-4 As shown, a combined CT-DEMS aqueous battery in-situ detection device includes: an in-situ detection unit 1 and a CT imaging unit 2, the in-situ detection unit 1 includes a fixed cover 101, a rotatable shell 102, a battery shell 103 and a base 104 arranged in series, wherein the rotatable shell 102 is located below the fixed cover 101 and rotates relative to it, the upper part of the fixed cover 101 has a first opening 101a in fluid communication with the external DEMS system 3, the pipeline between the DEMS system 3 and the first opening 101a is relatively fixed, and its The bottom has a second opening 101b that is in fluid communication with the interior of the rotatable shell 102. The battery shell 103 is detachably connected to the rotatable shell 102 and the base 104, respectively, to facilitate the installation and replacement of the battery. The rotatable shell 102 has a first conductor 102a inside, and the base 104 has a second conductor 104a inside. The first conductor 102a and the second conductor 104a define a battery receiving chamber 103a in the battery shell 103. The battery to be tested in the battery receiving chamber 103a is in electrical communication with the first conductor 102a and the second conductor 104a, respectively. The fixed cover 101, the rotatable shell 102, the battery shell 103 and the base 104 are all arranged vertically together on the same central axis and can be disassembled and separated to improve the flexibility of the device. The first opening 101a is located on the side of the fixed cover 101. The first opening 101a has a built-in thread to tightly connect to the DEMS output pipeline to ensure the sealing of gas transmission. The rotatable shell 102 is a first cylinder that passes through from top to bottom, and the first conductor 102a is fixedly connected to the inside of the first cylinder. The diameter of the first cylinder is equal to the diameter of the bottom of the fixed cover 101. The battery shell 103 is a second cylinder that passes through from top to bottom, and the inner diameter of the second cylinder is equal to the inner diameter of the first cylinder. The cross-section of the base 104 is a convex structure, and there is space inside it to accommodate the second conductor 104a. The top surface of the second conductor 104a is flush with the top surface of the base 104, and the diameter of the top surface of the second conductor 104a is equal to the diameter of the battery shell 103. Among them, the DEMS system 3 is an in-situ differential electrochemical mass spectrometer for receiving battery gas discharged from the first opening 101a.

[0029] like Figure 1 and Figure 2As shown, the CT imaging unit 2 includes an X-ray generator 201 and a flat panel detector 202 arranged relative to each other, with a liftable rotating platform 203 disposed between the X-ray generator 201 and the flat panel detector 202. The in-situ detection unit 1 is located on the liftable rotating platform 203. The gas generated by the battery to be detected flows through the rotatable housing 102 and the fixed cover 101 and is discharged to the DEMS system 3 through the first opening 101a. Simultaneously, the liftable rotating platform 203 drives the base 104 to rotate, driving the battery housing 103 and the rotatable housing 102 to rotate together, while the fixed cover 101 connected to the DEMS system 3 remains stationary. The X-ray radiation source emitted by the X-ray generator 201 penetrates the rotating battery housing 103 and reaches the flat panel detector 202, thereby imaging and monitoring the structural changes of the battery to be detected. CT imaging technology is used to perform in-situ detection of aqueous batteries, and the internal structure of the battery is tomographically scanned by an X-ray beam, capable of obtaining high-precision three-dimensional images. X-rays are sensitive to differences in material density and can therefore clearly reveal the boundaries and fine structures between different components within a battery. They can also perform compositional analysis based on differences in X-ray absorption by different materials. The elevating rotating platform 203 comprises a rotating platform and a base, as well as an elevator connected between the rotating platform and the base. The elevator has two sets of scissor-like lifting arms, ensuring the smoothness and safety of the lifting process. During operation, the elevator is controlled to raise and lower the rotating platform to a predetermined height, aligning the battery housing 103 of the in-situ detection unit 1 with the output port of the X-ray generator 201. The rotation of the rotating platform then drives the synchronous rotation of the rotatable housing 102, battery housing 103, and base 104, allowing the X-ray radiation source to penetrate the circumferential wall of the battery housing 103. CT imaging characterization of aqueous batteries during charge and discharge processes was performed under in-situ operating conditions to detect structural changes within the battery. This was then combined with in-situ differential electrochemical mass spectrometry technology to monitor gas production during the process.

[0030] like Figure 3 and Figure 4As shown, a bearing 101c is arranged in the second opening 101b, and the fixed cover body 101 is rotatably connected to the rotatable shell 102 through the bearing 101c. A first fluid channel 101d is arranged inside the fixed cover body 101, and the first opening 101a is connected with the second opening 101b through the first fluid channel 101d. The first conductor 102a has a through second fluid channel 102b, and the second fluid channel 102b is respectively connected with the first fluid channel 101d and the battery accommodating chamber 103a. The gas generated in the battery accommodating chamber 103a passes through the second fluid channel 102b and the bearing 101c in turn, and finally converges to the first opening 101a through the first fluid channel 101d, and is smoothly discharged to the external DEMS system 3 for mass spectrometry analysis. Among them, the bearing 101c is a rolling bearing, which includes an outer ring and an inner ring arranged coaxially, and a plurality of rolling bodies slidably connected between the outer ring and the inner ring. The outer surface of the outer ring is fixedly connected to the inner surface of the second opening 101b, and the bottom of the inner ring is fixedly connected to the top of the first conductor 102a. When the rotatable shell 102 rotates, the rolling bearing enables the fixed cover body 101 to remain relatively stationary, which is crucial for maintaining the stability of the connection of the DEMS system 3, and also ensures the continuity and accuracy of the gas transmission path.

[0031] like Figure 4 and Figure 5 As shown, the bottom of the base 104 is also equipped with a semiconductor 5 for transferring heat or cold to the second conductor 104a. A heating module 7 and a cooling module 6 are externally configured on the in-situ detection unit 1, with the semiconductor 5 being connected to the heating module 7 and the cooling module 6, respectively. The semiconductor 5 is affixed to the base and abuts the bottom of the second conductor 104a. The semiconductor 5 is capable of receiving heat or cold energy transferred from the external heating module 7 and the cooling module 6. The heating module 7 and the cooling module 6 serve as independent and adjustable temperature control units, each connected to the semiconductor 5 via a circuit. When the heating module 7 is activated, the semiconductor 5 converts electrical energy into heat energy based on the action of the current. Through direct contact with the second conductor 104a, the heat is evenly transferred throughout the battery compartment 103a, thereby controlling the temperature rise within the compartment. Conversely, when the cooling module 6 is operating, the semiconductor 5 achieves a cooling effect through the reverse flow of current, transferring cold energy to the second conductor 104a, effectively lowering the temperature of the battery compartment 103a. This achieves controllable temperature inside the battery receiving chamber 103a, and monitors the internal structure and gas production of the battery at different temperatures. The detection temperature of the in-situ detection unit 1 is -60 to 120°C.

[0032] like Figure 4 and Figure 5As shown, the in-situ detection unit 1 is externally configured with an electrochemical workstation 4, which is electrically connected to the first conductor 102a and the second conductor 104a via wires. A first wire hole 102c is defined on the side of the rotatable housing 102, and a second wire hole 104d is defined on the side of the base 104. The wires of the electrochemical workstation 4 pass through the first and second wire holes 102c, 104d, respectively, and contact the first and second conductors 102a, 104a, forming a conductive circuit. The electrochemical workstation 4 applies a desired voltage or current signal to the first and second conductors 102a, 104a, causing the battery to conduct electricity for monitoring its internal structure and gas production.

[0033] like Figure 3 and Figure 4 As shown, the battery housing 103 is provided with a first electrode piece 103b and a second electrode piece 103c. A flange 103d is provided on the circumferential wall of the upper portion of the battery housing 103. The first electrode piece 103b is mounted on the flange 103d and abuts the bottom of the first conductor 102a. The second electrode piece 103c is located at the bottom of the battery housing 103 and abuts the top of the second conductor 104a. The space between the first electrode piece 103b and the second electrode piece 103c is filled with electrolyte, providing the necessary environment for the electrochemical reaction. The first electrode piece 103b, the second electrode piece 103c, and the electrolyte loaded in the battery receiving cavity 103a together constitute a battery system to realize the internal structure and gas production detection of the battery. Of course, cylindrical batteries, button batteries, etc. can be assembled in the battery receiving cavity 103a to adapt to other types of batteries for internal structure and gas production detection.

[0034] like Figure 4 As shown, an annular groove 104b is circumferentially provided at the edge of the top of the second conductor 104a. A sealing ring 104c is disposed on the annular groove 104b to seal the joint between the second conductor 104a and the battery housing 103. The sealing ring 104c fits tightly within the annular groove 104b, effectively preventing electrolyte or other fluid substances from leaking from the joint between the second conductor 104a and the battery housing 103, thereby ensuring the stability and safety of the internal environment of the battery.

[0035] The battery housing 103 is made of PEEK (polyetheretherketone), which exhibits high-temperature resistance, excellent mechanical strength, chemical stability, and excellent electrical insulation properties. This ensures that the battery housing 103 maintains structural integrity and functional stability even in extreme operating environments. Furthermore, it allows X-ray radiation to penetrate its interior, enabling non-destructive testing of internal battery gas production. Both the first conductor 102a and the second conductor 104a are made of stainless steel, a material that effectively resists electrochemical corrosion, reduces performance degradation due to environmental factors, and ensures stable and efficient current transmission.

[0036] like Figure 5 As shown, according to the method of using the above-mentioned aqueous battery in-situ detection device combined with CT-DEMS, the method includes the following steps:

[0037] The battery to be tested is placed in the battery receiving cavity 103a of the in-situ testing unit 1 and electrically connected to the first conductor 102a and the second conductor 104a. Before electrically connecting the battery to the first conductor 102a and the second conductor 104a, a low-voltage pre-test is performed to check the conductivity of each contact point to ensure there are no short circuits or open circuits, thereby improving the accuracy of subsequent testing.

[0038] The first conductor 102a and the second conductor 104a are made conductive by the electrochemical workstation 4, causing the gas generated by the battery to be tested to flow through the rotatable housing 102 and the fixed cover 101 and be discharged from the first opening 101a to the DEMS system 3 for mass spectrometry analysis. The electrochemical workstation 4 dynamically adjusts the output current or voltage based on the real-time status of the battery to simulate the battery reaction under actual operating conditions and truly reflect the battery performance and gas production characteristics. An airtightness detection point is set on the gas flow path to ensure that the gas does not leak when flowing through the rotatable housing 102 and the fixed cover 101, thereby ensuring the purity and accuracy of the gas sample collected by the DEMS system 3.

[0039] The liftable rotating platform 203 is driven to rotate the base 104, and the battery shell 103 and the rotatable shell 102 are driven to rotate together, while the fixed cover 101 connected to the DEMS system 3 remains stationary. At the same time, the X-ray generator 201 emits an X-ray radiation source that penetrates the battery shell 103 and reaches the flat-panel detector 202 to obtain a CT image of the gas production of the battery to be tested. Among them, the rotation of the liftable rotating platform 203, the pulse emission of the X-ray generator 201 and the data acquisition of the flat-panel detector 202 are synchronized to obtain high-quality CT images. Through CT multi-angle scanning, a more complete three-dimensional battery internal structure model is constructed to improve the accuracy of gas distribution and generation mechanism analysis. At the same time, advanced image processing algorithms are used to perform noise reduction, edge enhancement and other processing on the CT images to improve the clarity and contrast of the image, which is convenient for subsequent bubble identification, gas distribution analysis and other work.

[0040] The mass spectrometry data collected by the DEMS system 3 is precisely matched with the CT images in time and space to achieve synchronous analysis of the gas composition and the internal structure of the battery, so as to reveal the relationship between the battery's gas production mechanism and structural changes.

[0041] In summary, the present invention's combined CT-DEMS in-situ detection device for aqueous batteries performs X-ray computed tomography (X-ray CT) characterization of aqueous batteries during charge and discharge under in-situ operating conditions. It is then combined with in-situ differential electrochemical mass spectrometry (DEMS) technology to monitor gas production during the process. During testing, the device can adapt to the requirements of electrolytes with varying pH levels, performing in-situ X-ray computed tomography (XCT) characterization of aqueous batteries under non-destructive conditions, and successfully addresses the impact of sample uniformity on the characterization results during XCT characterization. During testing, the rotation of the in-situ detection unit is controlled by a liftable rotating platform, driving the synchronous rotation of the base, battery housing, and rotatable housing, allowing for imaging of the battery at different angles and positions to comprehensively capture changes in the battery structure. Importantly, the fixed cover connected to the DEMS system remains stationary throughout the rotation process, ensuring that the fixed cover does not move with the rotation of the liftable rotating platform, thereby ensuring that gas production can be smoothly and accurately monitored by the DEMS system. This not only improves monitoring efficiency but also enhances the mechanical stability of the entire system, reducing errors caused by vibration or movement.

[0042] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A combined CT-DEMS aqueous battery in-situ detection device, characterized in that: include: An in-situ detection unit, comprising a fixed cover, a rotatable shell, a battery shell, and a base arranged in series, wherein the rotatable shell is located below the fixed cover and rotates relative thereto, the upper portion of the fixed cover has a first opening in fluid communication with an external DEMS system, and the bottom portion has a second opening in fluid communication with the interior of the rotatable shell, the battery shell is detachably connected to the rotatable shell and the base, respectively, the rotatable shell has a first conductor inside, the base has a second conductor inside, the first conductor and the second conductor define a battery accommodating chamber in the battery shell, and the battery to be detected in the battery accommodating chamber is electrically connected to the first conductor and the second conductor, respectively; A CT imaging unit, comprising an X-ray generator and a flat panel detector arranged relative to each other, a liftable and rotatable platform disposed between the X-ray generator and the flat panel detector, and the in-situ detection unit located on the liftable and rotatable platform, wherein gas generated by the battery to be detected flows through the rotatable shell and the fixed cover and is discharged to the DEMS system through the first opening, while the liftable and rotatable platform drives the base to rotate and drives the battery shell and the rotatable shell to rotate together, while the fixed cover connected to the DEMS system remains stationary, and the X-ray radiation source emitted by the X-ray generator penetrates the rotating battery shell and reaches the flat panel detector, so as to image and monitor the structural changes of the battery to be detected; An electrochemical workstation is disposed outside the in-situ detection unit, and the electrochemical workstation is connected to the first conductor and the second conductor circuits respectively through wires.

2. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 1, characterized in that: A bearing is arranged in the second opening, and the fixed cover body is rotatably connected to the rotatable shell through the bearing. A first fluid channel is arranged inside the fixed cover body, and the first opening is connected to the second opening through the first fluid channel. The first conductor has a penetrating second fluid channel, and the second fluid channel is respectively connected to the first fluid channel and the battery accommodating cavity fluid.

3. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 1, characterized in that: The bottom of the base is also provided with a semiconductor for transferring heat or cold to the second conductor. The outside of the in-situ detection unit is provided with a heating module and a cooling module. The semiconductor is respectively connected to the heating module and the cooling module circuits.

4. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 3, characterized in that: The detection temperature of the in-situ detection unit is -60 to 120°C.

5. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 1, characterized in that: A first pole piece and a second pole piece are arranged in the battery housing. A flange is provided on the circumferential wall of the upper portion of the battery housing. The first pole piece is placed on the flange and abuts against the bottom of the first conductor. The second pole piece is located at the bottom of the battery housing and abuts against the top of the second conductor. The space between the first pole piece and the second pole piece is filled with electrolyte.

6. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 5, characterized in that: An annular groove is circumferentially provided at the edge of the top of the second conductor, and a sealing ring is disposed on the annular groove for sealing the joint between the second conductor and the battery housing.

7. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 1, characterized in that: The material of the battery shell is PEEK.

8. The aqueous battery in-situ detection device combined with CT-DEMS according to claim 1, characterized in that: The first conductor and the second conductor are both made of stainless steel.

9. The method according to any one of the above claims using the combined CT-DEMS aqueous battery in-situ detection device, characterized in that: The method comprises the following steps: Placing the battery to be tested in the battery receiving cavity of the in-situ testing unit, and making the battery to be tested electrically connected to the first conductor and the second conductor respectively; The first conductor and the second conductor are made conductive by the electrochemical workstation, so that the gas generated by the battery to be tested flows through the rotatable housing and the fixed cover and is discharged from the first opening to the DEMS system for mass spectrometry analysis; The liftable rotatable platform is driven to rotate the base, and the battery shell and the rotatable shell are driven to rotate together, while the fixed cover connected to the DEMS system remains stationary. At the same time, the X-ray generator emits an X-ray radiation source that penetrates the battery shell and reaches the flat panel detector to obtain a CT image of the battery structure changes to be detected.

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