Internal structure detection device for battery cell failure

Abstract

The present application provides an internal structure detection device for a failed battery cell, and relates to the technical field of battery cell failure detection. The internal structure detection device includes a base mechanism, a carrier mechanism, a radiation source mechanism, a detection mechanism, and a puncture mechanism; the carrier mechanism, the radiation source mechanism, and the detection mechanism are installed on the base mechanism, wherein the carrier mechanism is arranged between the radiation source mechanism and the detection mechanism; the carrier mechanism includes a rotating table and an explosion-proof box, the explosion-proof box is installed on the rotating table, and the battery cell to be detected is installed inside the explosion-proof box; the puncture assembly includes at least one puncture mechanism, the puncture mechanism includes a bracket and a puncture piece, the puncture piece is movably installed on the bracket, and the puncture piece punctures into or moves out of the interior of the explosion-proof box along a preset direction. The internal structure detection device for a failed battery cell can achieve the technical effect of improving the detection efficiency of the failed battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell failure detection, and in particular to a device for detecting internal structure of a battery cell failure. Background Art

[0002] As an important tool for energy storage and conversion, the safety of batteries has attracted more and more attention, and battery safety testing is extremely important. Battery safety testing can discover problems in the design and production process of products, thereby improving product quality, effectively reducing or avoiding the occurrence of safety accidents such as battery combustion and explosion, protecting the safety of users' lives and property, and enhancing market competitiveness. The battery cell failed during the safety test, and the study of its thermal runaway mechanism has guiding significance for the improvement of the battery cell structure. However, there are currently few effective monitoring signals for thermal runaway of battery cells, and there are no obvious failure characteristics in the appearance and voltage / temperature curve before failure. The subsequent cause of failure can only be inferred by disassembling the battery cell. There is no effective means to monitor the internal failure process of the battery cell and analyze the failure mechanism. Failure improvement research is hindered, and the efficiency of detecting battery cell failure is very low. Utility Model Content

[0003] The purpose of the present application is to provide a device for detecting the internal structure of a battery cell failure, which can achieve the technical effect of improving the efficiency of detecting battery cell failure.

[0004] The present application provides an internal structure detection device for a failed battery cell, comprising a base mechanism, a stage mechanism, a radiation source mechanism, a detection mechanism and a puncture mechanism;

[0005] The stage mechanism, the radiation source mechanism, and the detection mechanism are installed on the base mechanism, wherein the stage mechanism is arranged between the radiation source mechanism and the detection mechanism;

[0006] The platform mechanism comprises a rotating platform and an explosion-proof box, wherein the explosion-proof box is installed on the rotating platform, and the battery cell to be tested is installed inside the explosion-proof box;

[0007] The acupuncture assembly includes at least one acupuncture mechanism, which includes a bracket and a puncture piece. The puncture piece is movably mounted on the bracket, and the puncture piece punctures into or moves out of the interior of the explosion-proof box along a preset direction.

[0008] In the above implementation process, by setting up a ray source mechanism and a detection mechanism, the ray source mechanism provides X-rays that can penetrate the interior of the battery cell, and the detection mechanism collects the X-rays and converts them into electrical signals, thereby realizing visual dynamic monitoring of the internal structure of the battery cell to be inspected in the explosion-proof box; in addition, the orientation position of the explosion-proof box can be adjusted by the rotating table to adjust the multi-angle detection of the battery cell to be inspected to ensure the effectiveness of the detection; the rotating table is combined with a movable puncture piece to adjust the puncture position and puncture angle of the puncture piece to more effectively simulate the test scenario of shallow puncture / acupuncture of the battery cell; thereby, the internal structure detection device for battery cell failure can achieve the technical effect of improving the detection efficiency of battery cell failure.

[0009] Furthermore, the carrier mechanism also includes a protective plate, which is matched with the explosion-proof box, wherein the protective plate is provided with a puncture opening, and the puncture member pierces into or moves out of the interior of the explosion-proof box along a preset direction through the puncture opening.

[0010] In the above implementation process, effective protection is provided during the failure of the battery cell by setting up a protective plate, and the protective plate is provided with corresponding puncture openings to facilitate the puncture piece to penetrate into or move out of the interior of the explosion-proof box.

[0011] Furthermore, the protective plate is provided with water injection holes, and a drainage groove is provided between the rotating platform and the explosion-proof box.

[0012] In the above implementation process, by setting the water injection hole, when the battery cell in the explosion-proof box is out of control, it can be opened to inject water into the explosion-proof box to achieve the effect of extinguishing the fire; in addition, the drainage groove is used to catch the water used to extinguish the fire and prevent it from flowing into the interior of the device, thereby realizing the internal structure detection device that protects the battery cell from failure.

[0013] Furthermore, the platform mechanism also includes a base plate and a support assembly, the support assembly includes a plurality of supports, the explosion-proof box is installed between the protective plate and the base plate, and the protective plate and the base plate are connected through the supports.

[0014] In the above implementation process, protective plates are installed between the two ends of the explosion-proof box and the bottom plate, and the structural strength of the explosion-proof box is strengthened by setting multiple pillars, thereby effectively improving the protection performance of the internal structure detection device for battery cell failure.

[0015] Furthermore, the explosion-proof box is provided with a plurality of wire holes.

[0016] In the above implementation process, by setting a wire hole on the explosion-proof box, on the one hand, it can serve as a puncture opening for the puncture piece, and on the other hand, it is convenient for the battery cell to be tested in the explosion-proof box to be connected to external equipment, such as a charger and discharger; the wire hole can also be used as a drainage outlet when the battery cell is out of control, so as to facilitate the discharge of water out of the explosion-proof box.

[0017] Furthermore, the needle-piercing member includes a top needle-piercing member, and the top needle-piercing member vertically pierces into or moves out of the interior of the explosion-proof box.

[0018] In the above implementation process, by setting a top puncture piece, it is possible to puncture into or move out of the interior of the explosion-proof box in the vertical direction; for example, the battery cell to be tested may be a square shell battery cell or a cylindrical battery cell, and the top puncture piece can realize upper and lower and side puncture of the square shell battery cell, as well as side puncture of the cylindrical battery cell.

[0019] Furthermore, the needle-piercing member includes a side needle-piercing member, and the side needle-piercing member pierces into or moves out of the interior of the explosion-proof box along a horizontal direction.

[0020] In the above implementation process, by setting up the side piercing piece, it can be inserted into or removed from the interior of the explosion-proof box in the horizontal direction; for example, when the battery cell to be tested is a square shell battery cell, the side piercing piece can achieve large-surface piercing of the square shell battery cell.

[0021] Furthermore, the ray source mechanism is an X-ray source mechanism, and a focal spot size of the X-ray source mechanism is less than or equal to 0.1 mm.

[0022] Furthermore, the internal structure detection device also includes a charging and discharging motor and a heating film mechanism, the charging and discharging motor is electrically connected to the battery cell to be detected inside the explosion-proof box, the heating film mechanism is arranged inside the explosion-proof box, and the heating film mechanism is matched with the battery cell to be detected.

[0023] In the above implementation process, the overcharge test of the battery cell to be tested is performed by the charging and discharging motor, and the built-in heating film of the battery cell to be tested is heated by the heating film mechanism, thereby realizing overcharge failure detection and thermal runaway detection of the battery cell to be tested.

[0024] Furthermore, the internal structure detection device also includes a first carbon fiber protective plate and a second carbon fiber protective plate, wherein the first carbon fiber protective plate is installed to match the detection mechanism, and the first carbon fiber protective plate covers a large surface of the detection mechanism; the second carbon fiber protective plate is installed to match the radiation source mechanism, and the second carbon fiber protective plate is arranged at the exit of the radiation source mechanism.

[0025] In the above implementation process, the first carbon fiber protective plate and the second carbon fiber protective plate are provided to respectively improve the protection effects of the detection mechanism and the radiation source mechanism; thus, through the combination of the radiation source mechanism and the detection mechanism with the carbon fiber protective plates, effective protection against thermal runaway of the battery cell can be achieved, and the overall process of battery cell failure can be monitored during thermal runaway, without posing a threat to equipment safety.

[0026] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of an internal structure detection device for a battery cell failure provided in an embodiment of the present application;

[0030] Figure 2 A schematic top view of a top needle-piercing member puncture test provided in an embodiment of the present application;

[0031] Figure 3 A schematic top view of the side puncture member during a puncture test provided in an embodiment of the present application.

[0032] Reference numerals: base mechanism 100; stage mechanism 200; rotating table 210; explosion-proof box 220; protective plate 230; radiation source mechanism 300; detection mechanism 400; acupuncture assembly 500; acupuncture mechanism 510; bracket 520; acupuncture piece 530; top acupuncture piece 531; side acupuncture piece 532. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0034] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0035] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0038] Generally, when a battery cell fails during safety testing, research on its thermal runaway mechanism has guiding significance for improving the battery cell structure. However, there are few effective monitoring signals for thermal runaway of commonly used battery cells, and there are no obvious failure characteristics in the appearance and voltage / temperature curve before failure. The cause of failure can only be inferred through battery cell disassembly. There is no effective means to monitor the failure process inside the battery cell and analyze the failure mechanism. Therefore, research on failure improvement is hindered, and the efficiency of detecting battery cell failure is very low.

[0039] In view of the technical problems raised above, the embodiments of the present application provide a device for detecting the internal structure of a battery cell failure, which can be used to effectively monitor the inside of the battery cell during the battery cell failure process, thereby achieving the technical effect of improving the detection efficiency of the battery cell failure; see Figure 1 , Figure 1A schematic diagram of the structure of a device for detecting the internal structure of a failed battery cell provided in an embodiment of the present application, wherein the device for detecting the internal structure of a failed battery cell comprises a base mechanism 100, a stage mechanism 200, a radiation source mechanism 300, a detection mechanism 400 and a puncture assembly 500;

[0040] Exemplarily, the stage mechanism 200, the radiation source mechanism 300, and the detection mechanism 400 are installed on the base mechanism 100, wherein the stage mechanism 200 is arranged between the radiation source mechanism 300 and the detection mechanism 400;

[0041] Among them, the base mechanism 100 is used to install the carrier mechanism 200, the ray source mechanism 300, and the detection mechanism 400, providing an installation platform for the above-mentioned mechanisms; the carrier mechanism 200 is used to place the battery cell to be tested, and the ray source mechanism 300 provides X-rays for detection. The X-rays are received by the detection mechanism 400 after passing through the carrier mechanism 200. The detection mechanism 400 is a device that can convert the received X-ray energy into a recordable electrical signal, so as to effectively monitor the interior of the battery cell to be tested during the battery cell failure process, and realize visual dynamic monitoring of the internal structure of the battery cell.

[0042] Exemplarily, the stage mechanism 200 includes a rotating table 210 and an explosion-proof box 220, the explosion-proof box 220 is installed on the rotating table 210, and the battery cell to be tested is installed inside the explosion-proof box 220;

[0043] Among them, the explosion-proof box 220 is a transparent box, which is used to fix the battery cell to be tested. On the one hand, it does not affect the detection of the battery cell to be tested by the radiation source mechanism 300 and the detection mechanism 400, and on the other hand, it provides effective protection during battery cell failure detection; in addition, the explosion-proof box 220 can be rotated by the rotating table 210 to adjust the multi-angle detection of the battery cell to be tested to ensure the effectiveness of the detection.

[0044] Exemplarily, the puncture assembly 500 includes at least one puncture mechanism 510, the puncture mechanism 510 includes a bracket 520 and a puncture member 530, the puncture member 530 is movably mounted on the bracket 520, and the puncture member 530 punctures into or moves out of the explosion-proof box 220 along a preset direction;

[0045] Among them, the puncture piece can be used to perform a puncture test on the battery cell to be tested inside the explosion-proof box 220, simulating the test scenario of shallow puncture / puncture of the battery cell; the puncture piece 530 can be moved on the bracket to facilitate the adjustment of the puncture position of the puncture piece 530.

[0046] Illustratively, the internal structure detection device for failed batteries provided in the embodiment of the present application, by setting a radiation source mechanism 300 and a detection mechanism 400, has the radiation source mechanism provide X-rays that can penetrate the interior of the battery cell, and the detection mechanism 400 collects the X-rays and converts them into electrical signals, thereby realizing visual dynamic monitoring of the internal structure of the battery cell to be detected in the explosion-proof box 220; in addition, the orientation position of the explosion-proof box 220 can be adjusted by the rotating table 210 to adjust the multi-angle detection of the battery cell to be detected to ensure the effectiveness of the detection; the rotating table 210 cooperates with the movable puncture member 530 to adjust the insertion position and insertion angle of the puncture member 530 to more effectively simulate the test scenario of shallow puncture / acupuncture of the battery cell; thereby, the internal structure detection device for failed batteries can achieve the technical effect of improving the detection efficiency of battery cell failure.

[0047] Exemplarily, the carrier mechanism 200 further includes a protective plate 230, which is matched with the explosion-proof box 220, wherein the protective plate 230 is provided with a puncture opening, and the puncture member 530 pierces into or moves out of the interior of the explosion-proof box 220 along a preset direction through the puncture opening.

[0048] Exemplarily, effective protection is provided during the failure of the battery cell by providing the protection plate 230 , and the protection plate 230 is provided with corresponding puncture openings to facilitate the puncture member 530 to penetrate into or move out of the interior of the explosion-proof box 220 .

[0049] Optionally, the battery cell to be tested provided in the embodiment of the present application may be a square shell battery cell or a cylindrical battery cell, which is only used as an example and not as a limitation. The battery cell to be tested may also be a battery cell of other shapes or forms.

[0050] Exemplarily, the protection plate 230 is provided with water injection holes, and a drainage groove is provided between the rotating platform 210 and the explosion-proof box 220 .

[0051] Illustratively, by setting a water injection hole, when the battery cell in the explosion-proof box 220 is out of control, it can be opened to inject water into the explosion-proof box 220 to achieve the effect of extinguishing the fire; in addition, the drainage groove is used to catch the water used to extinguish the fire and prevent it from flowing into the interior of the device, thereby realizing an internal structure detection device that protects the battery cell from failure.

[0052] Exemplarily, the platform mechanism 200 further includes a base plate and a support assembly, the support assembly includes a plurality of supports, the explosion-proof box is installed between the protective plate and the base plate, and the protective plate and the base plate are connected via the supports.

[0053] Exemplarily, protective plates are installed between the two ends of the explosion-proof box and the bottom plate, and the structural strength of the explosion-proof box is strengthened by providing a plurality of pillars, thereby effectively improving the protective performance of the internal structure detection device for battery cell failure.

[0054] Exemplarily, the explosion-proof box 220 is provided with a plurality of wire holes.

[0055] For example, by providing a wire hole on the explosion-proof box 220, on the one hand, it can serve as a puncture opening for the puncture member 530, and on the other hand, it is convenient for the battery cell to be tested in the explosion-proof box 220 to be connected to external equipment, such as a charger and discharger; the wire hole can also serve as a drainage outlet when the battery cell is out of control, so as to facilitate the discharge of water out of the explosion-proof box 220.

[0056] Exemplarily, the piercing member 530 includes a top piercing member 531 , and the top piercing member 531 pierces into or moves out of the interior of the explosion-proof housing 220 along a vertical direction.

[0057] Exemplarily, by setting up the top piercing member 531, it is possible to pierce into or move out of the interior of the explosion-proof box 220 in the vertical direction; for example, the battery cell to be tested may be a square shell battery cell or a cylindrical battery cell, and the top piercing member 530 can achieve upper and lower and side piercing of the square shell battery cell, as well as side piercing of the cylindrical battery cell.

[0058] Exemplarily, the needle-piercing member includes a side needle-piercing member 532 , and the side needle-piercing member 532 pierces into or moves out of the interior of the explosion-proof box 220 along a horizontal direction.

[0059] Exemplarily, by providing the side puncturing piece 532 , it is possible to puncture into or move out of the interior of the explosion-proof box 220 in the horizontal direction; for example, when the battery cell to be inspected is a square shell battery cell, the side puncturing piece 532 can achieve large-surface puncture of the square shell battery cell.

[0060] Exemplarily, the ray source mechanism is an X-ray source mechanism, and the focal spot size of the X-ray source mechanism is less than or equal to 0.1 mm.

[0061] Exemplarily, the internal structure detection device also includes a charging and discharging motor and a heating film mechanism, the charging and discharging motor is electrically connected to the battery cell to be detected inside the explosion-proof box, the heating film mechanism is arranged inside the explosion-proof box, and the heating film mechanism is matched with the battery cell to be detected.

[0062] Exemplarily, the overcharge test of the battery cell to be tested is performed by a charging and discharging motor, and the built-in heating film of the battery cell to be tested is heated by a heating film mechanism, thereby achieving overcharge failure detection and thermal runaway detection of the battery cell to be tested.

[0063] In some implementation scenarios, the processing process of the heating film mechanism and the battery cell to be tested is as follows: the heating film will be buried inside the battery cell by a special method during sample preprocessing of the battery cell to be tested, and the battery cell will be heated from the inside by the heating film, thereby inducing thermal runaway of the battery cell. This thermal runaway method is the method in which the built-in heating film induces thermal runaway.

[0064] Exemplarily, the internal structure detection device also includes a first carbon fiber protective plate and a second carbon fiber protective plate, wherein the first carbon fiber protective plate is installed to match the detection mechanism 400, and the first carbon fiber protective plate covers a large surface of the detection mechanism 400; the second carbon fiber protective plate is installed to match the radiation source mechanism 300, and the second carbon fiber protective plate is installed at the exit of the radiation source mechanism 300.

[0065] Exemplarily, by providing a first carbon fiber protective plate and a second carbon fiber protective plate, the protective effects of the detection mechanism 400 and the radiation source mechanism 300 are respectively improved; thus, by combining the radiation source mechanism 300 and the detection mechanism 400 with the carbon fiber protective plates, effective protection against thermal runaway of the battery cell can be achieved, and the overall process of battery cell failure can be monitored during thermal runaway, without posing a threat to equipment safety.

[0066] See also Figures 2 to 3 , Figure 2 This is a top view schematic diagram of the top needle-piercing member puncture test provided in the embodiment of the present application. Figure 3 A schematic top view of the side puncture member during a puncture test provided in an embodiment of the present application.

[0067] In some implementation scenarios, combined with Figures 1 to 3 As shown, the embodiment of the present application provides an internal structure detection device for a failed battery cell, which is a real-time dynamic monitoring system for the internal structure of a battery cell during a safety test process based on X-ray imaging. By integrating a puncture tool, a charging and discharging machine, and a heating film tool, and carrying an effective protection design, it can realize the visual dynamic monitoring of the internal structure of the battery cell in three test scenarios: shallow puncture / puncture, overcharging, and built-in heating film; a detailed description example of the internal structure detection device for a failed battery cell is as follows:

[0068] 1. Base mechanism 100:

[0069] The base mechanism 100 uses a high-precision grating ruler, which can control the distance between the ray source mechanism 300 and the stage mechanism 200, and the distance between the ray source mechanism 300 and the detection mechanism 400, so as to adjust the magnification;

[0070] 2. Carrier mechanism 200:

[0071] 2.1: The rotating table 210 adopts a marble base to ensure the rotation flatness, deformation and smooth movement;

[0072] 2.2: The explosion-proof box 220 is made of 8mm carbon fiber + fireproof cloth. The elastic modulus of carbon fiber is about 230~340Gpa, the yield strength is ~600Mpa, and the fireproof cloth is resistant to high temperature greater than 1000℃. The combination of the two can withstand the high temperature impact and fire of 150Ah ternary battery failure. The gray value of 190KV, 250ua X-ray passing through a 51mm thick battery with 8mm carbon fiber + fireproof cloth is attenuated by ~8% compared with the gray value without protection;

[0073] 2.3: The water injection hole is connected to the water pipe, which can be opened when the battery cell is out of control to extinguish the fire;

[0074] 2.4: The drainage trough is used to collect the water used to extinguish the fire and prevent it from flowing into the equipment;

[0075] 2.5: Wire hole, charging and discharging machine and other thermocouple wire harness wire hole, the charging and discharging machine is located outside the equipment, the wire harness is pulled inside and connected to the battery cell;

[0076] 2.6: vertical needling position, compatible with the movement space of the top needling member 531;

[0077] 2.7: The protective plate 230 and the bottom plate are arranged at the upper and lower ends of the explosion-proof box 220, which are not within the imaging field of view and can improve the protection strength; optionally, the protective plate 230 and the bottom plate can be protected by aluminum plates;

[0078] 2.8: Support: Through the bolts, the protective plate 230 and the bottom plate, the protective plate 230 can be supported to prevent being opened by the high-temperature airflow when the battery cell valve is opened;

[0079] 3. Radiation source mechanism 300:

[0080] The ray source mechanism 300 is used to provide X-rays, and is a device that emits X-rays at a specific emission angle. The smaller the focal size of the X-ray source, the higher the image resolution. Optionally, the method uses a micro-focus X-ray source, which can achieve high-precision defect recognition. Micro-focus refers to a focal size of less than 0.1 mm.

[0081] Among them, the ray source mechanism 300 is equipped with a second carbon fiber protective plate. The carbon fiber is mainly composed of carbon elements, and has the characteristics of high temperature resistance, friction resistance, heat conduction and corrosion resistance. The appearance is fibrous, soft, and can be processed into various fabrics. Because its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has high strength and modulus along the fiber axis direction, and the density of carbon fiber is small ~1.5-2.0 g / cm3, which does not affect X-ray imaging. It is an excellent protective material that can replace steel. Optionally, the embodiment of the present application uses an 8mm thick carbon fiber plate to cover the ray source outlet, and the rest of the ray source is covered with steel.

[0082] 4. Detection mechanism 400:

[0083] The detection mechanism may be a flat panel detector, i.e., a device that can convert received X-ray energy into a recordable electrical signal; optionally, the thermal runaway rate of the battery cell is relatively fast during the safety test, so a relatively fast detector capture rate is required, and therefore a high frame rate flat panel detector is used in the embodiment of the present application;

[0084] The detection mechanism 400 is equipped with a first carbon fiber protective plate; optionally, the first carbon fiber protective plate uses a carbon fiber plate with a thickness of 8 mm to cover the large surface of the detection mechanism 400, and the remaining parts of the detection mechanism 400 are covered with steel;

[0085] 5. Acupuncture assembly 500:

[0086] 5.1: The top needle-piercing member 531 can be used to pierce the top and bottom and sides of the square shell battery cell, and the side of the cylindrical battery cell, such as Figure 2 As shown; wherein, a movable grating is provided on the bracket 520 of the top needle-piercing member 531, which can realize the movement of the top needle-piercing member 531 in the X-axis and Y-axis directions, and is compatible with batteries of different sizes;

[0087] 5.2: The side needle-punching member 532 can realize the large-surface needle-punching of the square shell battery cell, such as Figure 3 As shown; wherein, the bracket 520 of the side needle-piercing member 532 is provided with a movable grating, which can realize the movement of the side needle-piercing member 532 in the X-axis, Y-axis, Z-axis and R-axis directions, and is compatible with batteries of different sizes;

[0088] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0089] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0090] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0091] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A device for detecting the internal structure of a battery cell failure, characterized in that: It includes a base mechanism, a stage mechanism, a radiation source mechanism, a detection mechanism and an acupuncture mechanism; The stage mechanism, the radiation source mechanism, and the detection mechanism are installed on the base mechanism, wherein the stage mechanism is arranged between the radiation source mechanism and the detection mechanism; The platform mechanism comprises a rotating platform and an explosion-proof box, wherein the explosion-proof box is installed on the rotating platform, and the battery cell to be tested is installed inside the explosion-proof box; The acupuncture assembly includes at least one acupuncture mechanism, which includes a bracket and a puncture piece. The puncture piece is movably mounted on the bracket, and the puncture piece punctures into or moves out of the interior of the explosion-proof box along a preset direction.

2. The internal structure detection device for battery cell failure according to claim 1, characterized in that: The platform mechanism also includes a protective plate, which is matched with the explosion-proof box, wherein the protective plate is provided with a puncture opening, and the puncture member pierces into or moves out of the interior of the explosion-proof box along a preset direction through the puncture opening.

3. The internal structure detection device for battery cell failure according to claim 2, characterized in that: The protective plate is provided with water injection holes, and a drainage groove is provided between the rotating platform and the explosion-proof box.

4. The internal structure detection device for battery cell failure according to claim 2, characterized in that: The platform mechanism also includes a base plate and a support assembly, the support assembly includes a plurality of supports, the explosion-proof box is installed between the protective plate and the base plate, and the protective plate and the base plate are connected via the supports.

5. The internal structure detection device for battery cell failure according to claim 1 or 2, characterized in that: The explosion-proof box is provided with a plurality of wire holes.

6. The internal structure detection device for battery cell failure according to claim 1, characterized in that: The needle-piercing member includes a top needle-piercing member, and the top needle-piercing member pierces into or moves out of the interior of the explosion-proof box along a vertical direction.

7. The internal structure detection device for battery cell failure according to claim 1 or 6, characterized in that: The puncture piece includes a side puncture piece, and the side puncture piece punctures into or moves out of the interior of the explosion-proof box along a horizontal direction.

8. The internal structure detection device for battery cell failure according to claim 1, characterized in that: The ray source mechanism is an X-ray source mechanism, and a focal spot size of the X-ray source mechanism is less than or equal to 0.1 mm.

9. The internal structure detection device for battery cell failure according to claim 1, characterized in that: The internal structure detection device also includes a charging and discharging motor and a heating film mechanism. The charging and discharging motor is electrically connected to the battery cell to be detected inside the explosion-proof box. The heating film mechanism is arranged inside the explosion-proof box and matches the battery cell to be detected.

10. The internal structure detection device for battery cell failure according to claim 1, characterized in that: The internal structure detection device also includes a first carbon fiber protective plate and a second carbon fiber protective plate, wherein the first carbon fiber protective plate is installed to match the detection mechanism, and the first carbon fiber protective plate covers the large surface of the detection mechanism; the second carbon fiber protective plate is installed to match the radiation source mechanism, and the second carbon fiber protective plate is arranged at the exit of the radiation source mechanism.

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