Battery testing device and battery testing system

Abstract

The application belongs to the technical field of battery detection, and discloses a battery testing device and a battery testing system. The battery testing device comprises a testing shell and a pressurizing mechanism. The pressurizing mechanism comprises oppositely arranged first and second pressurizing components, both of which partially extend into the testing shell and form a testing cavity for placing a battery, one of the first and second pressurizing components is fixedly connected with the testing shell, and the other is slidingly connected with the testing shell to apply pressure to the battery through a pressurizing device. In this way, dynamic mechanical pressure change testing of the battery can be performed, in-situ testing of the battery under dynamic stress change is realized, the pressure borne by the battery can change in a large range during the testing process, and the upper limit of the pressure is high, which can ensure that the particles in the solid-state battery are fully contacted, so that the battery can be effectively tested, and the accuracy of the testing result is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of battery testing, and more particularly to a battery testing device and a battery testing system. Background Technology

[0002] As the power source for electronic devices, the performance and quality of batteries directly affect the operational status of these devices. Therefore, it is necessary to conduct appropriate tests on batteries to detect changes during charging and discharging, under pressure, and other conditions, thereby enabling a more in-depth assessment of the battery's properties and quality.

[0003] With the development of new materials and in-depth research into electrochemical mechanisms, advanced micro- and nano-scale observation and experimental techniques are needed to achieve non-destructive, real-time, and high-precision three-dimensional observation of the structure and morphology of electrode materials under electrochemical charge-discharge conditions. High-energy synchrotron X-rays and high-flux neutrons, due to their complementary absorption coefficients for matter, have gradually become powerful tools for characterizing multi-scale structural changes in recent years. They have been widely used in the development of new lithium-ion battery materials and the study of electrochemical reaction mechanisms, enabling a deeper analysis and understanding of the physical and chemical properties of lithium-ion battery systems.

[0004] However, most common testing techniques are non-in-situ. During the electrode material transfer process, the structure, morphology, and composition of the sample are inevitably damaged. Therefore, more accurate testing is required through in-situ synchrotron radiation and neutron in-situ imaging characterization techniques.

[0005] Considering the unique characteristics of synchrotron radiation and neutron sources, it is of great significance to develop in-situ testing micro-devices suitable for synchrotron X-ray and neutron three-dimensional tomographic imaging. These devices can be built on neutron imaging equipment to conduct in-situ electrochemical-neutron CT imaging experiments by applying pressure to the battery and detecting changes in the battery during charging and discharging. This enables in-situ visualization testing of the electrochemical performance of battery samples, synchronous stress-strain testing of batteries, and changes in mechanical structure.

[0006] In existing technology, battery testing devices include a main housing, an upper pressure head, a lower pressure head, a spring, and an electrode assembly. The battery is installed inside the main housing, with its upper end abutting against the spring, its lower end connected to the lower pressure head, and the end of the spring furthest from the battery connected to the upper pressure head. During battery testing, the upper pressure head is moved to compress the spring, which in turn compresses the battery, thus generating corresponding pressure on the battery.

[0007] When the above device is used, the pressure is generated by a spring. However, the pressure generated by the spring is very limited, and the adjustable range of the pressure on the battery is small. When testing solid-state batteries, there may be insufficient contact between the solid powder particles in the solid-state battery, which leads to a decrease in the accuracy of the test results. Summary of the Invention

[0008] The purpose of this invention is to provide a battery testing device and a battery testing system, which solves the problem that the pressure applied to the battery during the testing process in the prior art is relatively small and the upper limit of the pressure that can be applied to the battery is low, which is not conducive to the effective measurement of solid-state batteries and results in low accuracy of test results.

[0009] To achieve this objective, the present invention adopts the following technical solution: A battery testing apparatus includes a test housing and a pressurizing mechanism. The pressurizing mechanism is for connection to a pressurizing device. The pressurizing mechanism includes a first pressurizing component and a second pressurizing component disposed opposite to each other. Both the first pressurizing component and the second pressurizing component partially extend into the test housing and form a test cavity for placing a battery. One of the first pressurizing component and the second pressurizing component is fixedly connected to the test housing, and the other is slidably connected to the test housing to apply pressure to the battery through the pressurizing device.

[0010] Optionally, the first pressurizing component includes: a first pressurizing rod, one end of which extends into the test housing and the other end of which is used to connect to the pressurizing device; and a first pressurizing head, which is disposed at the end of the first pressurizing rod that extends into the test housing, and the test cavity is formed between the pressurizing head and the second pressurizing component.

[0011] Optionally, the second pressurizing component includes: a second pressurizing rod, one end of which extends into the test housing and the other end of which is used to connect to the pressurizing device; and a second pressurizing head, which is disposed at the end of the second pressurizing rod that extends into the test housing, and the test cavity is formed between the second pressurizing head and the first pressurizing component.

[0012] Optionally, the outer wall of the pressurizing mechanism forms an isolation gap with the inner wall of the test housing.

[0013] Optionally, the pressurization mechanism further includes a detection element disposed within the test housing and used to detect the pressure applied to the battery.

[0014] Optionally, the pressurizing mechanism is provided with a wiring hole for threading a lead wire and communicating with the test chamber, the lead wire being used to connect the battery to the charging and discharging equipment.

[0015] Optionally, the pressurizing mechanism further includes a sealing plate disposed at the wiring hole to close the wiring hole.

[0016] Optionally, the battery testing device further includes a sealing component disposed on the test housing and connected to the pressurizing mechanism to seal the gap between the pressurizing mechanism and the test housing.

[0017] Optionally, the sealing assembly includes: a first sealing ring disposed between the pressurizing mechanism and the test housing; a second sealing ring disposed between the first sealing ring and the pressurizing mechanism; a sealing gland disposed on the pressurizing mechanism and connected to the first sealing ring and the second sealing ring respectively; and a third sealing ring disposed on the test housing and abutting against the first sealing ring.

[0018] A battery testing system includes: a battery testing device as described in any of the preceding claims; a chassis disposed on the battery testing device; and a neutron imaging spectrometer, wherein the sample base of the neutron imaging spectrometer is connected to the chassis.

[0019] The beneficial effects of this invention are: During battery testing, either the first or second pressurizing component is connected to a pressurizing device. If one component is fixed to the test casing, the other, driven by the pressurizing device, can compress the battery within the test chamber. Depending on the test requirements, the pressurizing device can generate corresponding pressure, which is then applied to the battery via the pressurizing mechanism. This allows for dynamic mechanical pressure variation testing of the battery, achieving in-situ testing under dynamic stress changes. Furthermore, the pressure exerted on the battery during testing can vary over a wide range, with a high upper pressure limit, ensuring sufficient contact between particles inside the solid-state battery and effectively improving the accuracy of the test results.

[0020] When testing the battery, the testing device can be installed in the neutron imaging spectrometer by connecting the chassis to the sample base, so that the changes of the battery can be observed in real time during the test. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the battery testing device in some embodiments of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the first pressure rod of the battery testing device in some embodiments of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the test shell of the battery testing device in some embodiments of the present invention.

[0024] In the picture: 100 Test housing; 110 Mounting groove; 120 Annular groove; 200 First pressurizing assembly; 210 First pressurizing rod; 211 Fixing hole; 212 Wiring hole; 213 Sealing plate; 220 First pressurizing head; 300 Second pressurizing assembly; 310 Second pressurizing rod; 320 Second pressurizing head; 400 Battery; 500 Test chamber; 600 Sealing assembly; 610 First sealing ring; 611 Sealing ring; 620 Second sealing ring; 630 Sealing gland; 640 Third sealing ring; 700 Detection piece; 800 Sealing section. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0026] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0029] This invention provides a battery testing device and a battery testing system for performing dynamic mechanical pressure change testing on batteries, thereby achieving in-situ testing of batteries under dynamic stress changes.

[0030] Figure 1 This is a schematic diagram of the battery testing device in some embodiments of the present invention. (Refer to...) Figure 1 As shown, the battery testing device includes a test housing 100 and a pressurizing mechanism. The pressurizing mechanism is used to connect to a pressurizing device and includes a first pressurizing component 200 and a second pressurizing component 300 disposed opposite to each other. Both the first pressurizing component 200 and the second pressurizing component 300 partially extend into the test housing 100 and form a test cavity 500 for placing the battery 400. One of the first pressurizing component 200 and the second pressurizing component 300 is fixedly connected to the test housing 100, and the other is slidably connected to the test housing 100 to apply pressure to the battery 400 by the pressurizing device.

[0031] Specifically, the test shell 100 is a rotating body made of titanium-zirconium alloy to form a cross-section with low neutron scattering, facilitating neutron observation of the battery 400 inside the test shell 100. The outer diameters at both ends of the test shell 100 can be larger than the outer diameter at the middle of the test shell 100, and its two ends are respectively connected to the first pressurization component 200 and the second pressurization component 300.

[0032] The first pressurizing component 200 can be elongated, with one end extending into the test housing 100 and the other end used to connect to the pressurizing device. The pressurizing device can be a hydraulically driven mechanism or other equipment capable of generating large pressure changes; this invention does not specifically limit the type of pressurizing device. The second pressurizing component 300 is the same as the first pressurizing component 200 and will not be described again here.

[0033] The battery 400 tested in this invention can be a liquid battery or a solid battery. A solid battery contains positive electrode material powder, negative electrode material, and solid electrolyte powder. By applying sufficient pressure to the solid battery, the interfaces of the positive electrode, negative electrode, and electrolyte are fully contacted, allowing the solid battery to fully charge and discharge.

[0034] When testing the battery 400, the battery 400 is first placed into the test chamber 500, and the first pressurizing component 200 or the second pressurizing component 300 is connected to the pressurizing device. If one of them is fixed to the test shell 100, the other can squeeze the battery 400 in the test chamber 500 under the action of the pressurizing device.

[0035] According to the testing requirements, a corresponding pressure can be generated using a pressurizing device, and this pressure is applied to the battery 400 through a pressurizing mechanism. This allows for dynamic mechanical pressure change testing of the battery 400, enabling in-situ testing under dynamic stress changes. This allows for testing of the battery pressure changes caused by volume expansion due to lithium insertion / extraction in the electrode material lattice during charging and discharging of the key electrodes of the battery 400. Simultaneously, it allows for the inference of the reasons for battery performance degradation due to mechanical stress behavior.

[0036] During the test, the pressure that the battery 400 can withstand can vary within a wide range, and the upper limit of the pressure is relatively high. This ensures that the particles inside the solid-state battery are in full contact, allowing the battery 400 to undergo a full charge and discharge test, thereby effectively improving the accuracy of the test results.

[0037] Reference Figure 1 As shown, in some embodiments of the present invention, the first pressurizing assembly 200 includes a first pressurizing rod 210 and a first pressurizing head 220. One end of the first pressurizing rod 210 extends into the test housing 100, and the other end is used to connect to a pressurizing device. The first pressurizing head 220 is disposed at the end of the first pressurizing rod 210 that extends into the test housing 100, and a test cavity 500 is formed between the pressurizing head and the second pressurizing assembly 300.

[0038] Reference Figure 1 As shown, the second pressurizing assembly 300 includes a second pressurizing rod 310 and a second pressurizing head 320. One end of the second pressurizing rod 310 extends into the test housing 100, and the other end is used to connect to a pressurizing device. The second pressurizing head 320 is disposed at the end of the second pressurizing rod 310 that extends into the test housing 100, and a test cavity 500 is formed between the second pressurizing head 320 and the first pressurizing assembly 200.

[0039] Specifically, the first pressure rod 210 can be a body of revolution, and its cross-section can be T-shaped. The rod-shaped portion of the first pressure rod 210 is inserted into the test housing 100, while its circular portion is used to connect to the pressurizing device to increase the contact area between the first pressure head 220 and the pressurizing device, so as to calculate the specific pressure value borne by the battery 400 for analysis and processing of the battery 400 test. The circular portion is connected to the end face of the test housing 100 through a flange, and multiple bolts or other fasteners can be distributed circumferentially around the test housing 100 to achieve fixation or relative sliding between the first pressure rod 210 and the test housing 100.

[0040] Figure 2 This is a schematic diagram of the structure of the first pressure rod of the battery testing device in some embodiments of the present invention. (Refer to...) Figure 1 and Figure 2As shown, a fixing hole 211 is formed at one end of the first pressure rod 210 that extends into the test housing 100, and one end of the first pressure head 220 extends into the fixing hole 211. One end of the first pressure head 220 and the first pressure rod 210 can be fixedly connected by means of adhesive bonding, welding, or screwing. The other end of the first pressure head 220 extends out of the fixing hole 211, and the outer diameter of the end of the first pressure head 220 extending out of the fixing hole 211 is the same as the outer diameter of the rod-shaped part of the first pressure rod 210, so as to form a test cavity 500 with a relatively large space between the first pressure head 220 and the second pressure head 320.

[0041] The first pressure head 220 can be made of a metal material with high mechanical strength and low neutron absorption, such as titanium-zirconium alloy, while the first pressure rod 210 can be made of steel. The height of the first pressure head 220 can be between 6 and 15 mm. During the test, the movement range of the first pressure rod 210 can be between 200 and 1000 μm. The specific materials, dimensions, and other data of the first pressure head 220 and the first pressure rod 210 can be designed according to actual testing needs, and this invention does not impose any limitations.

[0042] A mounting groove can be formed on the end face of the second pressure head 320 near the first pressure head 220 to allow the battery 400 to be installed and to restrict the movement of the battery 400 within the test chamber 500. The specific structure of the second pressure assembly 300 is the same as that of the first pressure assembly 200, and will not be described again here. A gasket with a thickness between 20 and 100 μm can be placed in the mounting groove to adjust the height of the battery in the mounting groove and prevent the battery from being completely inside the mounting groove and unable to contact the first pressure head 220.

[0043] During pressure loading, the second pressure rod 310 is fixedly connected to the test housing 100 by bolts and flanges, while the first pressure rod 210 is connected to the pressure equipment. The pressure equipment can move the first pressure head 220 by squeezing the first pressure rod 210. The first pressure head 220 can squeeze the battery 400. At this time, the second pressure head 320 is restricted by the second pressure rod 310 and remains stationary, so that the battery 400 continuously bears a large pressure, so as to successfully test the battery 400.

[0044] Reference Figure 1As shown, in some embodiments of the present invention, the outer wall of the pressurizing mechanism and the inner wall of the test shell 100 form an isolation gap 130. Specifically, the outer diameter of the rod-shaped portion of the first pressurizing rod 210 is smaller than the inner diameter of the test shell 100 to facilitate the formation of the isolation gap 130. The outer diameter of the first pressurizing head 220 is the same as the outer diameter of the first pressurizing rod 210, thus separating the test chamber 500 from the test shell 100. This prevents the battery 400 inside the test chamber 500 from contacting the test shell 100, effectively reducing the possibility of a short circuit caused by contact between the battery 400 and the test shell 100, and improving the stability, safety, and accuracy of the battery 400 during testing. In this embodiment, the difference between the outer diameter of the rod-shaped portion of the first pressurizing rod 210 and the inner diameter of the test shell 100 is between 0.5 mm and 2 mm.

[0045] Reference Figure 1 As shown, in some embodiments of this application, a sealant 800 can be provided in the isolation gap 130, located on the outer wall of the second pressure head 320, and sealed tightly against the inner wall of the test housing 100. The sealant 800 is inserted into the test housing 100 during battery installation to prevent battery powder particles from falling into the isolation gap 130, and also to increase the spatial confinement pressure of the first pressure head 220 and the second pressure head 320 relative to the battery 400. The sealant 800 can be made of a material insensitive to neutron velocity, such as glass fiber.

[0046] Reference Figure 1 As shown, in some embodiments of the present invention, the pressurizing mechanism further includes a detection element 700. The detection element 700 is disposed within the test housing 100 and is used to detect the pressure applied to the battery 400.

[0047] Specifically, the detection element 700 can be a sensor, which can be disposed on the end face of the first pressure head 220 or the end face of the second pressure head 320. This sensor can be connected to a display device outside the test housing 100 via wireless communication or by connecting leads. The detection element 700 can detect the pressure exerted on the battery 400 in real time and display the results on the display device. Since the changes in the mechanical pressure of the battery are caused by varying degrees of volume expansion due to the lithium insertion / extraction process of the electrode materials during charging and discharging, operators can determine the cause of the degradation of the electrochemical performance of the battery 400 based on the changes in the mechanical pressure parameters of the battery 400.

[0048] Reference Figure 1 and Figure 2As shown, in some embodiments of the present invention, the pressurizing mechanism is provided with a wiring hole 212 for threading a lead wire and communicating with the test chamber 500. The lead wire is used to connect the battery 400 to a charging / discharging device. The pressurizing mechanism also includes a sealing plate 213. The sealing plate 213 is disposed in the wiring hole 212 to close the wiring hole 212.

[0049] Specifically, through holes are provided in the middle of both the first pressure rod 210 and the second pressure rod 310 as wiring holes 212. Corresponding through holes are also provided on the first pressure head 220 and the second pressure head 320, communicating with the wiring holes 212, so that the wiring holes 212 are connected to the test chamber 500. One end of the lead wire passes through the wiring hole 212 into the test chamber 500 and is connected to the battery 400. The other end of the lead wire is connected to the charging and discharging equipment so that the battery 400 can be charged and discharged using the charging and discharging equipment.

[0050] The sealing plate 213 can be fixed to the end wall of the first pressure rod 210 or the second pressure rod 310 using fasteners such as bolts, and the cross-sectional area of ​​the sealing plate 213 is larger than the cross-sectional area of ​​the wiring hole 212 to effectively seal the wiring hole 212. The sealing plate 213 can also be used to seal the wiring hole 212 by vacuum sealing to reduce the possibility of air contact with the battery 400 and improve the accuracy of the measurement.

[0051] Reference Figure 1 As shown, in some embodiments of the present invention, the battery testing apparatus further includes a sealing assembly 600. The sealing assembly 600 is disposed on the test housing 100 and connected to the pressurizing mechanism to seal the gap between the pressurizing mechanism and the test housing 100.

[0052] Specifically, sealing components 600, consisting of sealing gaskets and other structures, can be installed at both ends of the test housing 100. The sealing gaskets make sealing contact with the first pressure rod 210 or the second pressure rod 310, thereby sealing the gaps at both ends of the test housing 100. The sealing gaskets can also extend into the inner wall of the test housing 100 to improve the sealing effect and reduce the possibility of air and moisture entering the test housing 100 and coming into contact with the battery 400.

[0053] In some embodiments of the present invention, the sealing assembly 600 includes a first sealing ring 610, a second sealing ring 620, a sealing gland 630, and a third sealing ring 640. The first sealing ring 610 is disposed between the pressurizing mechanism and the test housing 100. The second sealing ring 620 is disposed between the first sealing ring 610 and the pressurizing mechanism. The sealing gland 630 is disposed on the pressurizing mechanism and connected to the first sealing ring 610 and the second sealing ring 620, respectively. The third sealing ring 640 is disposed on the test housing 100 and abuts against the first sealing ring 610.

[0054] Specifically, the cross-section of the first sealing ring 610 can also be T-shaped, with its upper end fixed to the test housing 100 by bolts on the flange, and its lower end extending into the test housing 100. The first pressure rod 210 passes through the first sealing ring 610, and the outer wall of the rod-shaped portion of the first pressure rod 210 abuts against the inner wall of the first sealing ring 610 to seal the gap between the first pressure rod 210 and the test housing 100.

[0055] Reference Figure 1 As shown, a sealing ring 611 is provided at the upper end of the first sealing ring 610, and a second sealing ring 620 is disposed inside the sealing ring 611. The second sealing ring 620 can be a sealant, which fills the sealing ring 611. The open end of the sealing ring 611 is closed by a sealing gland 630, which is fixed to the first sealing ring 610 by bolts on a flange. The lower end of the sealing gland 630 extends into the sealing ring 611 and abuts against the solidified second sealing ring 620, thereby sealing the gap between the first pressure rod 210 and the first sealing ring 610.

[0056] Figure 3 This is a schematic diagram of the test casing of the battery testing device in some embodiments of the present invention. (Refer to...) Figure 1 and Figure 3 As shown, an annular groove 120 is formed on the end face of the test housing 100, and the third sealing ring 640 is disposed in the annular groove 120. The third sealing ring 640 is a rubber ring, and its upper side extends out of the annular groove 120 and abuts against the first sealing ring 610, thereby sealing the gap between the first sealing ring 610 and the test housing 100.

[0057] The battery testing system includes a neutron imaging spectrometer, a chassis, and a battery testing device as described in any of the above embodiments. The chassis is mounted on the battery testing device. The sample base of the neutron imaging spectrometer is connected to the chassis. Specifically, the chassis can be disc-shaped, with multiple bolt holes on its end face for bolt connection to the sample base. The sample base can rotate 360° to facilitate the acquisition of corresponding three-dimensional tomographic (CT) data. Simultaneously, the neutron imaging spectrometer can be used to perform in-situ observation of the battery's three-dimensional structure to accurately monitor changes in the battery during the testing process.

[0058] When testing battery 400, the battery testing device can be embedded in the neutron imaging spectrometer by connecting the chassis to the sample base, so that the changes of battery 400 can be observed in real time during the test.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery testing device, used to build upon a neutron imaging device to perform in-situ testing of a battery under dynamic stress changes, characterized in that, The battery testing device includes: Test shell (100); the test shell (100) is a rotating body and is made of titanium-zirconium alloy. A pressurizing mechanism for connection to a pressurizing device, the pressurizing mechanism comprising a first pressurizing component (200) and a second pressurizing component (300) disposed opposite to each other, both the first pressurizing component (200) and the second pressurizing component (300) partially extending into the test housing (100) and forming a test cavity (500) for placing a battery (400), one of the first pressurizing component (200) and the second pressurizing component (300) being fixedly connected to the test housing (100), and the other being slidably connected to the test housing (100) to apply pressure to the battery (400) by the pressurizing device; The first pressurizing assembly (200) includes: a first pressurizing rod (210), one end of which extends into the test housing (100) and the other end of which is used to connect to the pressurizing device; and a first pressurizing head (220), which is disposed at the end of the first pressurizing rod (210) that extends into the test housing (100), and the test cavity (500) is formed between the pressurizing head and the second pressurizing assembly (300); Alternatively, the second pressurizing assembly (300) includes: a second pressurizing rod (310), one end of which extends into the test housing (100) and the other end of which is used to connect to the pressurizing device; and a second pressurizing head (320), disposed at the end of the second pressurizing rod (310) that extends into the test housing (100), wherein the second pressurizing head (320) and the first pressurizing assembly (200) form the test cavity (500); and the outer sidewall of the pressurizing mechanism and the inner sidewall of the test housing (100) form an isolation gap (130).

2. The battery testing apparatus according to claim 1, characterized in that, The pressurization mechanism also includes: A detection element (700) is disposed inside the test housing (100) and is used to detect the pressure exerted on the battery (400).

3. The battery testing apparatus according to claim 1, characterized in that, The pressurizing mechanism is provided with a wiring hole (212) for threading a lead wire and communicating with the test chamber (500). The lead wire is used to connect the battery (400) and the charging and discharging device.

4. The battery testing apparatus according to claim 3, characterized in that, The pressurization mechanism also includes: A sealing plate (213) is provided at the wiring hole (212) to close the wiring hole (212).

5. The battery testing apparatus according to claim 1, characterized in that, The battery testing device also includes: A sealing assembly (600) is disposed on the test housing (100) and connected to the pressurizing mechanism to seal the gap between the pressurizing mechanism and the test housing (100).

6. The battery testing apparatus according to claim 5, characterized in that, The sealing assembly (600) includes: A first sealing ring (610) is disposed between the pressurizing mechanism and the test shell (100); The second sealing ring (620) is disposed between the first sealing ring (610) and the pressurizing mechanism; A sealing gland (630) is disposed on the pressurizing mechanism and connected to the first sealing ring (610) and the second sealing ring (620) respectively; and A third sealing ring (640) is disposed on the test shell (100) and abuts against the first sealing ring (610).

7. A battery testing system, characterized in that, The testing system includes: The battery testing apparatus as described in any one of claims 1 to 6; The chassis is mounted on the battery testing device; and A neutron imaging spectrometer, wherein the sample base of the neutron imaging spectrometer is connected to the chassis.

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