Battery needling device and battery testing system

Abstract

The utility model provides a battery needling device and a battery test system, the battery needling device comprises a carrying table, a detection mechanism and a first needling mechanism, and the carrying table is used for carrying a battery monomer; the first needling mechanism comprises a first driving assembly and a first needling needle, and the first driving assembly is used for driving the first needling needle to pierce the single battery to perform a needling test on the single battery. The detection mechanism comprises a ray source and a ray detector, the ray source is used for emitting rays penetrating through the battery monomer, the ray detector is used for receiving the rays emitted by the ray source and forming an electric signal, the electric signal can be processed to form an image, and in the acupuncture test process, the rays are continuously emitted to the battery monomer through the ray source; according to the method, a series of images can be formed, the series of images can visually reflect the dynamic change condition of the internal structure of the battery monomer, the internal failure process of the battery monomer can be visually and dynamically monitored, and the accuracy of failure mechanism analysis of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery testing, and in particular to a battery needle puncture device and a battery testing system. BACKGROUND

[0002] In recent years, power batteries have developed rapidly and can be widely applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, and to multiple fields such as electric vehicles, electric tools, military equipment and aerospace. The reliability of battery monomers, as the main component of power batteries, directly affects the safety of power batteries.

[0003] In order to test the reliability of battery monomers, needle puncture or extrusion tests are performed on the battery monomers. Needle puncture is mainly to cause positive and negative short circuits by puncturing the battery monomer with a needle, simulating the failure of the internal structure of the battery monomer. However, the current battery monomer needle puncture test lacks effective monitoring of the internal structure of the battery monomer, affecting the accuracy of the failure mechanism analysis of the battery monomer. In view of the above problems, the present application provides a battery needle puncture device and a battery testing system, which can improve the accuracy of the failure mechanism analysis of the battery monomer.

[0004] In view of the above problems, the present application provides a battery needle puncture device and a battery testing system, which can improve the accuracy of the failure mechanism analysis of the battery monomer.

[0005] In the first aspect, the embodiments of the present application provide a battery needle puncture device, which comprises a carrier, a detection mechanism and a first needle puncture mechanism. The carrier is used to carry a battery monomer. The detection mechanism comprises a radiation source and a radiation detector. The radiation source is used to emit radiation that passes through the battery monomer. The radiation detector is used to receive the radiation emitted by the radiation source and form an electrical signal. The first needle puncture mechanism comprises a first driving assembly and a first needle. The first driving assembly is used to drive the first needle to puncture the battery monomer.

[0006] In the above scheme, the battery monomer is carried by the carrier, and the first needle is driven by the first driving assembly to puncture the battery monomer, so that the battery monomer can be subjected to needle puncture testing. Moreover, the radiation source emits radiation to the battery monomer. The radiation passes through the battery monomer on the carrier and is received by the radiation detector. The radiation detector can convert the received radiation into an electrical signal and form an image in the external control terminal, thereby directly reflecting the internal condition of the battery monomer when the radiation passes through the battery monomer. On this basis, the radiation source continuously emits radiation to the battery monomer during the needle puncture test, and a series of images can be formed in the external control terminal. The series of images can directly reflect the dynamic changes of the internal structure of the battery monomer, realize the visual dynamic monitoring of the internal failure process of the battery monomer, and be conducive to improving the accuracy of the failure mechanism analysis of the battery monomer.

[0007] In some embodiments, the first driving assembly comprises a first driving member and a second driving member, the first driving member is connected with the first needle for driving the first needle to move in a first displacement direction, and the second driving member is connected with the first driving member for driving the first needle to move in a second displacement direction, the first displacement direction is the extension direction of the first needle, and is perpendicular to the second displacement direction.

[0008] In the above scheme, the first driving member is connected with the first needle for driving the first needle to move in the first displacement direction, so that the first needle can be pierced into the battery monomer in the first displacement direction, and the depth of the first needle pierced into the battery monomer can be adjusted by the first driving member, so as to improve the flexibility of the needle piercing test and the accuracy of the test results, and improve the test efficiency. The first needle is connected to the second driving member through the first driving member, and the second driving member can drive the first needle to move in the second displacement direction, adjust the position of the first needle in the second displacement direction, so that the first needle can be pierced into the battery monomer from different points in the second displacement direction, so as to more comprehensively evaluate the reliability of the battery monomer, improve the flexibility and reliability of the needle piercing test.

[0009] In some embodiments, the first driving assembly further comprises a third driving member, the third driving member is connected with the second driving member for driving the first needle to move in a third displacement direction, and the first displacement direction, the second displacement direction and the third displacement direction are arranged perpendicular to each other.

[0010] In the above scheme, the third driving member is connected with the second driving member, and the first needle is connected to the third driving member through the first driving member and the second driving member. The third driving member can drive the first needle to move in the third displacement direction, and adjust the position of the first needle in the third displacement direction, so that the first needle can also be pierced into the battery monomer from different points in the third displacement direction, so as to more comprehensively evaluate the reliability of the battery monomer, and further improve the flexibility and reliability of the needle piercing test.

[0011] In some embodiments, the first driving assembly further comprises a fourth driving member, the fourth driving member is used for driving the first needle to rotate around a rotation axis, and the extension direction of the rotation axis is perpendicular to the extension direction of the first needle.

[0012] In the above scheme, by setting the fourth driving member, before the first needle is pierced into the battery monomer, the fourth driving member can be used to drive the first needle to rotate around the rotation axis according to the actual situation of the shape, structure and the like of the battery monomer, so as to adjust the angle between the first needle and the rays emitted by the ray source and the angle of the first needle pierced into the battery monomer, thereby improving the flexibility of the needle piercing test and the effect of the dynamic monitoring of the detection mechanism on the internal situation of the battery monomer during the needle piercing test.

[0013] In some embodiments, the ray source and the ray detector are located on two sides of the carrier along the first direction, and the first needle is arranged to extend in a direction intersecting the first direction.

[0014] In the above scheme, the first needle extends in a direction intersecting the first direction, when the first needle is inserted into the battery monomer along its own extension direction, and the ray source emits rays to the ray detector, the extension direction of the rays passing through the battery monomer can intersect the extension direction of the first needle, so that the blocking of the rays by the first needle after the first needle is inserted into the battery monomer can be reduced, that is, the energy attenuation of the rays in the propagation process to the ray detector can be reduced, and the influence of the first needle on the visualization dynamic monitoring of the internal condition of the battery monomer in the needle test process can be reduced.

[0015] In some embodiments, the angle α between the extension direction of the first needle and the first direction satisfies: 20°≤α≤60°.

[0016] In the above scheme, the angle between the extension direction of the first needle and the first direction is greater than or equal to 20° and less than or equal to 60°, after the first needle is inserted into the battery monomer along its own extension direction, the first needle has less blocking to the rays emitted by the ray source, so that the influence of the first needle on the visualization dynamic monitoring of the internal condition of the battery monomer in the needle test process can be reduced, and the accuracy of the battery monomer failure mechanism analysis can be improved. At the same time, when the first needle is vertically inserted into the battery monomer, the angle between the surface of the battery monomer being inserted and the first direction can be greater than or equal to 30° and less than or equal to 70°, after the ray source emits rays to the ray detector and the rays pass through the battery monomer and are converted into electrical signals by the ray detector, the corresponding electrical signals form an image in the external control terminal, which can clearly and completely present the condition of each component inside the battery monomer, which is conducive to improving the accuracy of the battery monomer failure mechanism analysis.

[0017] In some embodiments, the angle α satisfies: 30°≤α≤45°.

[0018] In the above scheme, by further optimizing the angle between the extension direction of the first needle and the ray emission direction, the blocking of the rays emitted by the ray source by the first needle can be further reduced, the influence of the first needle on the visualization dynamic monitoring of the internal condition of the battery monomer in the needle test process can be reduced, and at the same time, the electrical signals converted by the ray detector can form an image in the external control terminal, which can more clearly and completely present the condition of each component inside the battery monomer.

[0019] In some embodiments, the ray source and the ray detector are arranged to be spaced apart along the first direction, and the carrier is arranged to be movable between the ray source and the ray detector along the first direction.

[0020] In the above scheme, the distance between the ray source and the corresponding battery monomer can be adjusted by moving the battery monomer on the carrier along the first direction, so as to adjust the definition and imaging range of the formed image.

[0021] In some embodiments, the first needle puncture mechanism is located on one side of the carrier along the second direction, and the first driving assembly includes a fifth driving member for driving the first needle to move along the first direction, and the first direction is perpendicular to the second direction.

[0022] In the above scheme, when the battery monomer on the carrier is moved along the first direction, the first needle is driven to move along the first direction by the fifth driving member, so that the position of the first needle along the first direction can be adjusted, so that the first needle can be punctured into the battery monomer from the preset position.

[0023] In some embodiments, the battery needle puncture device further comprises a second needle puncture mechanism, the second needle puncture mechanism comprising a second driving assembly and a second needle, the second driving assembly being used to drive the second needle to puncture into the battery monomer, wherein the first needle and the second needle are configured to puncture into the battery monomer along different directions.

[0024] In the above scheme, the second needle of the second needle puncture mechanism and the first needle of the first needle puncture mechanism are configured to puncture into the battery monomer along different directions, and the first needle and the second needle can be used for needle puncture test on different surfaces of the battery monomer, or can be used for needle puncture test on different battery monomers, which can improve the flexibility of the battery needle puncture device. In actual use, appropriate needle puncture mechanism can be selected for needle puncture test according to the shape, structure and other actual conditions of the battery monomer, so as to improve the test reliability of the needle puncture test and the detection reliability of the detection mechanism.

[0025] In some embodiments, the second driving assembly includes a sixth driving member, a seventh driving member and an eighth driving member, the sixth driving member is connected with the second needle and is used to drive the second needle to move along the third direction, the seventh driving member is connected with the sixth driving member and the eighth driving member respectively and is used to drive the second needle to move along the second direction, and the eighth driving member is used to drive the second needle to move along the first direction, and the second direction, the first direction and the third direction are perpendicular to each other.

[0026] In the above scheme, the second needle is driven to move along the third direction, the second direction and the first direction by the sixth driving member, the seventh driving member and the eighth driving member, which can adjust the depth of the second needle puncturing into the battery monomer, improve the flexibility and accuracy of the needle puncture test, and at the same time improve the test efficiency, and on the other hand, the position of the second needle puncturing into the battery monomer can be adjusted, so that the second needle can puncture into the battery monomer from different points, so as to more comprehensively evaluate the reliability of the battery monomer, and improve the flexibility and reliability of the needle puncture test.

[0027] In some embodiments, one of the extension direction of the first piercing needle and the extension direction of the second piercing needle is parallel to a horizontal direction, and the other is parallel to a vertical direction.

[0028] In the above scheme, one of the extension direction of the first piercing needle and the extension direction of the second piercing needle is parallel to a horizontal direction, and the other is parallel to a vertical direction, that is, one of the first piercing needle and the second piercing needle can pierce into the battery monomer along the horizontal direction, and the other can pierce into the battery monomer along the vertical direction, at this time, the battery monomer can be vertically or horizontally arranged on the carrier, without tilting, on the one hand, the positioning difficulty of the battery monomer can be reduced, and the positioning accuracy of the battery monomer can be improved, on the other hand, the assembly difficulty of the battery monomer can be reduced, and the requirement for the positioning clamp of the battery monomer can be reduced. In some embodiments, the ray source is a micro-focus ray source, the diameter of the focus of the ray source is less than or equal to 1 mm; and / or, the frame rate of the ray detector is greater than or equal to 25 frames per second.

[0029] In the above scheme, the ray source is set to be a micro-focus ray source, the diameter of the focus of the ray source is less than or equal to 1 mm, the definition of the image formed after the ray passes through the battery monomer can be improved, and the accuracy of the battery monomer failure mechanism analysis can be improved. The frame rate of the ray detector is set to be greater than or equal to 25 frames per second, which is helpful to realize high-frame-rate dynamic imaging, which can capture smooth and clear dynamic images, and further improve the accuracy of the battery monomer failure mechanism analysis.

[0030] In a second aspect, the embodiments of the present application provide a battery testing system, which comprises the battery piercing device of any one of the above.

[0031] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will give a specific embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any labor under the premise of the drawings.

[0033] Figure 1 is a structural schematic diagram of the battery piercing device provided by some embodiments of the present application;

[0034] Figure 2 is a structural schematic diagram of the first piercing mechanism of the battery piercing device provided by some embodiments of the present application;

[0035] Figure 3 is another structural schematic diagram of a battery needle device provided by some embodiments of the present application;

[0036] Figure 4 is a structural schematic diagram of a battery needle device provided by some embodiments of the present application;

[0037] Figure 5 is a structural schematic diagram of a second needle mechanism of a battery needle device provided by some embodiments of the present application.

[0038] Label name:

[0039] Battery needle device 1; carrier 100; battery cell 2; detection mechanism 200; ray source 210; ray detector 220; first needle mechanism 300; first driving assembly 310; first driving piece 311; second driving piece 312; third driving piece 313; fourth driving piece 314; fifth driving piece 315; first needle 320; guide rail mechanism 400; second needle mechanism 500; second driving assembly 510; sixth driving piece 511; seventh driving piece 512; eighth driving piece 513; second needle 520; first displacement direction X1; second displacement direction Y1; third displacement direction Z1; first direction X2; second direction Y2; third direction Z2. DETAILED DESCRIPTION

[0040] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0043] Reference to“an embodiment” or“the embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” or“in the embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of all other embodiments. One of ordinary skill in the art will readily recognize from the disclosure herein, that the embodiments described herein can be combined with embodiments not expressly described so as to realize additional embodiments of the application.

[0044] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, if not particularly stated.

[0045] All technical features and optional technical features of the present application can be combined with each other to form new technical solutions, if not particularly stated.

[0046] All steps of the present application can be performed in sequence or randomly, preferably in sequence, if not particularly stated. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) performed in sequence, or steps (b) and (a) performed in sequence. For example, it is mentioned that the method can further comprise step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0047] In the description of the embodiments of the present application, the term“and / or” is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0048] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging of the battery cell.

[0052] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0053] The battery cell can include an electrode assembly, an electrode terminal, and a pressure relief mechanism, etc. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. The positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector. The negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0054] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes.

[0055] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure, or it can be a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and the housing and the electrode assembly further include a sealing bag for packaging the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to package the electrode assembly, the electrolyte, and other components.

[0056] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery, such as a hexagonal prismatic battery, etc. The present application is not particularly limited.

[0057] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap covers the opening. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0058] In some embodiments, the housing is provided with at least one electrode terminal, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the shell.

[0059] In some embodiments, the housing is provided with a pressure relief mechanism. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0060] As an example, the pressure relief mechanism is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to the design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0061] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0062] As an example, the pressure relief mechanism can also be provided separately from the housing and connected to the housing.

[0063] The "actuation" mentioned in the present application refers to the pressure relief mechanism generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action generated by the pressure relief mechanism can include but is not limited to: the movement of a component in the pressure relief mechanism forming an exhaust passage, the breaking, crushing, tearing or opening of at least a part of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as exhaust. In this way, the battery cell can be relieved of pressure and temperature in a controllable manner, thereby avoiding potential more serious accidents.

[0064] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell.

[0065] The "exhaust" from the battery cell mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative plates, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0066] Battery cell as the main component of power battery, its reliability directly affects the safety of power battery. In order to test the reliability of battery cell, the battery cell will be tested by needle or extrusion. Needle is mainly to simulate the battery cell is damaged by the internal short circuit situation, in the needle test, by controlling the needle to a certain speed vertically into the battery cell, the needle stays in the battery cell, observe the temperature change of battery cell, current voltage change and gas release situation, according to the judgment of battery cell failure, analysis of the failure mechanism of battery cell, and then according to the failure mechanism of battery cell for optimal design. However, the current needle test can not be intuitive, dynamic monitoring of the failure process of battery cell, affect the accuracy of battery cell failure mechanism analysis.

[0067] In order to solve the above problems, the embodiment of the application provides a battery needle device 1 and a battery test system, which will be described in detail below.

[0068] Please refer to Figure 1 , the first aspect, the embodiment of the application provides a battery needle device 1, including the stage 100, detection mechanism 200 and first needle mechanism 300, the stage 100 is used for carrying battery cell 2; Detection mechanism 200 includes ray source 210 and ray detector 220, ray source 210 is used to send through the battery cell 2 of ray, ray detector 220 is used to receive the ray of ray source 210 and forms electric signal; The first needle mechanism 300 includes the first drive assembly 310 and the first needle 320, the first drive assembly 310 is used to drive the first needle 320 to stab into the battery cell 2.

[0069] The stage 100 is a component for supporting and fixing the battery cell 2. In some optional embodiments, the stage 100 can include a base and a fixing clamp, the base is used to support the battery cell 2, and the fixing clamp is arranged on the base and can fix the battery cell 2, so as to reduce the risk of deviation and movement of the battery cell 2 in the needle test.

[0070] The first piercing mechanism 300 is a component for performing a piercing test on the battery cell 2. The first piercing mechanism 300 can be arranged in various positions, and can be arranged on the stage 100 or at least one side of the stage 100. The first piercing mechanism 300 includes a first driving assembly 310 and a first piercing needle 320. The first driving assembly 310 is a component for driving the first piercing needle 320 to move and / or rotate. The first piercing needle 320 is a component that is driven by the first driving assembly 310 to pierce the battery cell 2, so as to perform a piercing test on the battery cell 2. It should be noted that the first piercing needle 320 can be arranged to penetrate the battery cell 2, and the needle tip of the first piercing needle 320 can be arranged to pierce the battery cell 2 from one surface of the battery cell 2 and extend out of another surface of the battery cell 2.

[0071] The extension direction of the first piercing needle 320 can be parallel to the horizontal direction, as shown in FIG. 3A, or can be parallel to the vertical direction, as shown in FIG. 3B. Alternatively, the extension direction of the first piercing needle 320 can be intersected with the horizontal direction or the vertical direction. Figure 1 When the battery cell 2 is arranged on the stage 100, the first piercing needle 320 can be arranged at any side of the battery cell 2 except the side in contact with the stage 100, and can pierce the battery cell 2 from any side of the battery cell 2 except the side in contact with the stage 100. For example, when the battery cell 2 includes a top surface, a bottom surface, and a plurality of side surfaces between the top surface and the bottom surface, the bottom surface of the battery cell 2 is in contact with the surface of the stage 100, and the first piercing needle 320 can pierce the battery cell 2 from the top surface or any one of the side surfaces of the battery cell 2. In addition, when performing a piercing test on the battery cell 2, the battery cell 2 can be flipped to enable the first piercing needle 320 to pierce the battery cell 2 from different surfaces, so as to comprehensively test the performance of the battery cell 2.

[0072] In some optional embodiments, the first piercing needle 320 can be perpendicular to the surface to be pierced of the battery cell 2 when piercing the battery cell 2, that is, the first piercing needle 320 is arranged to pierce the battery cell 2 vertically, so as to improve the reliability of the piercing test.

[0073] In some optional embodiments, the first driving assembly 310 can drive the first needle 320 to move along the extension direction of the first needle 320, so that the first needle 320 penetrates into the battery cell 2 along its own extension direction, which can reduce the risk of forming additional notches on the battery cell 2 when the first needle 320 penetrates into the battery cell 2. Optionally, the first driving assembly 310 can also drive the first needle 320 to move along other directions to adjust the position of the first needle 320, and the other directions can be perpendicular to or intersect with the extension direction of the first needle 320. Optionally, the first driving assembly 310 can also drive the first needle 320 to rotate to adjust the angle of the first needle 320. It should be noted that in the battery needle-piercing device 1, the number of the first needle-piercing mechanism 300 can be one or multiple, and when the number of the first needle-piercing mechanism 300 is multiple, the multiple first needle-piercing mechanisms 300 can simultaneously perform needle-piercing test on the same battery cell 2, or can be used to perform needle-piercing test on different battery cells 2.

[0074] The detection mechanism 200 is the main component for realizing the visual dynamic monitoring of the internal condition of the battery cell 2. The detection mechanism 200 includes a ray source 210 and a ray detector 220. The ray source 210 is a component for emitting rays to the battery cell 2. The ray detector 220 is a component that can receive the rays emitted by the ray source 210 and convert the energy in the rays into an electrical signal. The ray source 210 and the ray detector 220 are located on opposite sides of the battery cell 2, and at least one of the ray source 210 and the ray detector 220 can be arranged on the carrier 100 or can be separated from the carrier 100. The ray source 210 can emit a large amount of rays to the battery cell 2, and the rays have strong penetration ability and can pass through the battery cell 2 and be received by the ray detector 220. In the process of the rays passing through the battery cell 2, the components in the battery cell 2 will absorb the energy in the rays to a certain extent, and the ray detector 220 can convert the rays of different intensities into electrical signals, and then through the processing of the electrical signals by the external control terminal, a relatively clear image can be formed. It should be noted that the type of the rays emitted by the ray source 210 can be multiple, for example, the rays emitted by the ray source 210 can be X-rays.

[0075] In the above scheme, the battery monomer 2 is carried by the carrier 100, and the first needle 320 is driven to penetrate into the battery monomer 2 by the first driving assembly 310, so that the battery monomer 2 can be subjected to the needle test. And the battery monomer 2 is irradiated with rays by the ray source 210, the rays penetrate through the battery monomer 2 on the carrier 100 and are received by the ray detector 220, the ray detector 220 can convert the received rays into electrical signals and form images in the external control terminal, so as to intuitively reflect the internal situation of the battery monomer 2 when the rays penetrate through the battery monomer 2. On this basis, the battery monomer 2 is continuously irradiated with rays by the ray source 210 during the needle test, a series of images can be formed in the external control terminal, which can intuitively reflect the dynamic change of the internal structure of the battery monomer 2, realize the visual dynamic monitoring of the internal failure process of the battery monomer 2, and help to improve the accuracy of the failure mechanism analysis of the battery monomer 2.

[0076] It should be noted that the first needle test mechanism 300 can be used for needle test of various battery monomers 2, for example, the first needle test mechanism 300 can be used for needle test of cylindrical battery monomers 2, and can also be used for needle test of square battery monomers 2.

[0077] The cylindrical battery monomer 2 can include a top surface, a bottom surface and a side surface between the top surface and the bottom surface. When the top surface or the bottom surface of the cylindrical battery monomer 2 is subjected to the needle test by the first needle test mechanism 300, the first needle 320 can be penetrated into the top surface or the bottom surface of the cylindrical battery monomer 2, and the rays emitted by the ray source 210 can penetrate through the battery monomer 2 from the side surface of the cylindrical battery monomer 2, so that the finally formed image can more clearly reflect the internal structure of the battery monomer 2. When the side surface of the cylindrical battery monomer 2 is subjected to the needle test by the first needle test mechanism 300, the first needle 320 can be penetrated into part of the side surface of the cylindrical battery monomer 2, and the rays emitted by the ray source 210 can penetrate through the battery monomer 2 from another part of the side surface of the cylindrical battery monomer 2, so that the finally formed image can more clearly and completely reflect the internal structure of the battery monomer 2.

[0078] The square battery monomer 2 can include a top surface, a bottom surface, two first side surfaces oppositely arranged along the length direction of the bottom surface, and two second side surfaces oppositely arranged along the width direction of the bottom surface, wherein the area of the second side surface is generally larger than that of the first side surface.

[0079] When the top surface, the bottom surface, the first side surface or the second side surface of the square battery monomer 2 is subjected to the needle test by the first needle test mechanism 300, the first needle 320 can be penetrated into the battery monomer 2 from the corresponding surface, and the rays emitted by the ray source 210 can penetrate through the battery monomer 2 from the second side surface, so that the finally formed image can more clearly and completely reflect the internal structure of the battery monomer 2.

[0080] Referring to Figure 1 and Figure 2 In some embodiments, the first driving assembly 310 comprises a first driving member 311 and a second driving member 312, the first driving member 311 is connected with the first lancet 320 for driving the first lancet 320 to move along a first displacement direction X1, and the second driving member 312 is connected with the first driving member 311 for driving the first lancet 320 to move along a second displacement direction Y1, the first displacement direction X1 is the extension direction of the first lancet 320, and is perpendicular to the second displacement direction Y1.

[0081] The first driving member 311 is a driving component for driving the first lancet 320 to move along the first displacement direction X1, and the first driving member 311 can be directly connected with the first lancet 320 or indirectly connected with the first lancet 320 through other structures. The second driving member 312 is a driving component for driving the first lancet 320 to move along the second displacement direction Y1, and the second driving member 312 can be connected with the first driving member 311 to be connected with the first lancet 320 through the first driving member 311.

[0082] The first driving member 311 and the second driving member 312 can be the same driving component or different driving components, for example, the first driving member 311 and / or the second driving member 312 can be any one of a linear slide rail, a pneumatic cylinder, a hydraulic cylinder, a lead screw structure, etc., or the first driving member 311 and / or the second driving member 312 can also be a combination structure of multiple driving components.

[0083] It should be noted that the first displacement direction X1 is the extension direction of the first lancet 320, and can also be the length direction or the axial direction of the first lancet 320, and the second displacement direction Y1 is perpendicular to the first displacement direction X1, and can be any one of the radial directions of the first lancet 320. Exemplarily, the first displacement direction X1 can be parallel to the horizontal direction, and the second displacement direction Y1 can be parallel to the vertical direction.

[0084] In the above scheme, the first driving member 311 is connected with the first needle 320 and is used to drive the first needle 320 to move along the first displacement direction X1, so that the first needle 320 can be stabbed into the battery monomer 2 along the first displacement direction X1, and the depth of the first needle 320 stabbed into the battery monomer 2 can be adjusted through the first driving member 311, so as to improve the flexibility of the needle-punching test and the accuracy of the test result, and improve the test efficiency. The first needle 320 is connected with the second driving member 312 through the first driving member 311, the second driving member 312 can drive the first needle 320 to move along the second displacement direction Y1, adjust the position of the first needle 320 along the second displacement direction Y1, so that the first needle 320 can be stabbed into the battery monomer 2 from different points on the second displacement direction Y1, so as to more comprehensively evaluate the reliability of the battery monomer 2, and improve the flexibility and reliability of the needle-punching test.

[0085] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the first driving assembly 310 further comprises a third driving member 313, the third driving member 313 is connected with the second driving member 312 and is used to drive the first needle 320 to move along the third displacement direction Z1, and the first displacement direction X1, the second displacement direction Y1 and the third displacement direction Z1 are arranged perpendicular to each other.

[0086] The third driving member 313 is a driving component for driving the first needle 320 to move along the third displacement direction Z1, the third driving member 313 is connected with the second driving member 312 to be connected with the first needle 320 through the second driving member 312 and the first driving member 311. The third driving member 313 can be the same structure as the first driving member 311 and / or the second driving member 312, or can be a different structure. For example, the third driving member 313 can be any one of a linear slide rail, a pneumatic cylinder, a hydraulic cylinder, a lead screw structure, etc., or can also be a combined structure of multiple driving components. The first displacement direction X1, the second displacement direction Y1 and the third displacement direction Z1 are arranged perpendicular to each other, the third displacement direction Z1 can be one of the multiple radial directions of the first needle 320 perpendicular to the second displacement direction Y1, when the first displacement direction X1 is parallel to the horizontal direction and the second displacement direction Y1 is parallel to the vertical direction, the third displacement direction Z1 can be parallel to the horizontal direction.

[0087] In the above scheme, the third driving member 313 is connected with the second driving member 312, the first needle 320 is connected with the third driving member 313 through the first driving member 311 and the second driving member 312, and the third driving member 313 can drive the first needle 320 to move along the third displacement direction Z1, and adjusting the position of the first needle 320 along the third displacement direction Z1 can make the first needle 320 also pierce into the battery monomer 2 from different points on the third displacement direction Z1, so as to more comprehensively evaluate the reliability of the battery monomer 2, and further improve the flexibility and reliability of the needle-piercing test.

[0088] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the first driving assembly 310 further includes a fourth driving member 314, and the fourth driving member 314 is used to drive the first needle 320 to rotate around a rotation axis, and the extension direction of the rotation axis is perpendicular to the extension direction of the first needle 320.

[0089] The fourth driving member 314 is a component for driving the first needle 320 to rotate around the rotation axis, so as to adjust the angle at which the first needle 320 pierces into the battery monomer 2 and the angle between the first needle 320 and the rays emitted by the ray source 210. The fourth driving member 314 can be directly connected with the first needle 320, or indirectly connected with the first needle 320 through the first driving member 311, the second driving member 312, the third driving member 313, etc. The fourth driving member 314 can be various, and exemplarily, the fourth driving member 314 can be a driving motor, or other driving structures such as a rotary cylinder, etc.

[0090] The rotation axis can extend along any direction perpendicular to the first displacement direction X1, for example, the rotation axis can extend along the second displacement direction Y1, or extend along the third displacement direction Z1. Exemplarily, when the extension direction of the first needle 320 is parallel to the horizontal direction, the rotation axis can extend along the vertical direction, and the fourth driving member 314 can drive the first needle 320 to rotate in the horizontal plane.

[0091] In the above scheme, by arranging the fourth driving member 314, before the first needle 320 pierces into the battery monomer 2, the fourth driving member 314 can be used to drive the first needle 320 to rotate around the rotation axis according to the actual situation such as the shape and structure of the battery monomer 2, so as to adjust the angle between the first needle 320 and the rays emitted by the ray source 210 and the angle at which the first needle 320 pierces into the battery monomer 2, thereby improving the flexibility of the needle-piercing test and the effect of the dynamic monitoring of the detection mechanism 200 on the internal situation of the battery monomer 2 during the needle-piercing test.

[0092] Please refer to Figure 3In some embodiments, the ray source 210 and the ray detector 220 are located on two sides of the carrier 100 along the first direction X2, and the extending direction of the first needle 320 intersects the first direction X2.

[0093] The first direction X2 and the extending direction of the first needle 320 are two directions intersecting with each other, and the included angle therebetween can be an acute angle, a right angle, or an obtuse angle. The first direction X2 can be the length direction or the width direction of the carrier 100.

[0094] The ray source 210 and the ray detector 220 are located on two sides of the carrier 100 along the first direction X2, and when the battery cell 2 is arranged on the carrier 100, it is located between the ray source 210 and the ray detector 220 along the first direction X2. The ray source 210 and the ray detector 220 are both protruded relative to the bearing surface of the carrier 100 for bearing the battery cell 2, so that most of the rays emitted by the ray source 210 can pass through the battery cell 2 on the bearing surface and be received by the ray detector 220.

[0095] It should be noted that the rays emitted by the ray source 210 can extend linearly along the first direction X2; or the rays emitted by the ray source 210 can also extend in a scattered manner with the ray source 210 as the center, at this time, the extending direction of part of the rays passing through the battery cell 2 can be parallel to the first direction X2, and the extending direction of part of the rays intersects the first direction X2.

[0096] The extending direction of the first needle 320 intersects the first direction X2, compared to arranging the extending direction of the first needle 320 parallel to the first direction X2, when the first needle 320 pierces into the battery cell 2, the overlapping area of the projection of the first needle mechanism 300 and the ray source 210 along the first direction X2 in the plane perpendicular to the first direction X2 is smaller, thereby reducing the blocking of the rays emitted by the ray source 210 by the first needle mechanism 300.

[0097] In the above scheme, the extending direction of the first needle 320 intersects the first direction X2, when the first needle 320 pierces into the battery cell 2 along its own extending direction, and the ray source 210 emits rays to the ray detector 220, the extending direction of the rays passing through the battery cell 2 can intersect the extending direction of the first needle 320, thereby reducing the blocking of the rays by the first needle 320 after piercing into the battery cell 2, that is, reducing the energy attenuation of the rays in the process of propagating to the ray detector 220, and reducing the influence of the first needle 320 on the visualization dynamic monitoring of the internal situation of the battery cell 2 in the needle test process.

[0098] It can be understood that when the first needle 320 is inserted into the top surface or the bottom surface of the cylindrical battery monomer 2 from the side of the loading platform 100, or the first needle 320 is inserted into the top surface, the bottom surface or the first side of the square shell battery monomer 2 from the side of the loading platform 100, the extension direction of the first needle 320 can be perpendicular to the first direction X2, so that the rays emitted by the ray source 210 can pass through the battery monomer 2 approximately vertically, and the finally formed image can clearly and completely reflect the internal structure of the battery monomer 2. When the first needle 320 is inserted into the second side of the square shell battery monomer 2 from the side of the loading platform 100, the angle between the extension direction of the first needle 320 and the first direction X2 can be an acute angle or an obtuse angle, at this time, the angle between the rays emitted by the ray source 210 and the second side can be an acute angle, which can reduce the blocking of the rays by the first needle 320 to a certain extent, so that the finally formed image can clearly and completely reflect the internal structure of the battery monomer 2.

[0099] Please continue to refer to Figure 3 In some embodiments, the angle α between the extension direction of the first needle 320 and the first direction X2 satisfies: 20°≤α≤60°.

[0100] Specifically, the angle between the extension direction of the first needle 320 and the first direction X2 is greater than or equal to 20° and less than or equal to 60°, for example, the angle can be 20°, 30°, 40°, 45°, 50°, 60°, etc.

[0101] In the above scheme, the angle between the extension direction of the first needle 320 and the first direction X2 is greater than or equal to 20° and less than or equal to 60°, after the first needle 320 is inserted into the battery monomer 2 along the extension direction thereof, the first needle 320 has less blocking to the rays emitted by the ray source 210, thereby reducing the influence of the first needle 320 on the visualization and dynamic monitoring of the internal condition of the battery monomer 2 during the needle test, and improving the accuracy of the failure mechanism analysis of the battery monomer 2. At the same time, when the first needle 320 is vertically inserted into the battery monomer 2, the angle between the surface of the battery monomer 2 being inserted and the first direction X2 can be greater than or equal to 30° and less than or equal to 70°, after the ray source 210 emits rays and the rays pass through the battery monomer 2 and are converted into electrical signals by the ray detector 220, the corresponding electrical signals form an image in the external control terminal, which can clearly and completely present the condition of each component inside the battery monomer 2, which is conducive to improving the accuracy of the failure mechanism analysis of the battery monomer 2.

[0102] In some embodiments, the angle α satisfies: 30°≤α≤45°.

[0103] Specifically, the included angle between the extension direction of the first needle 320 and the first direction X2 is greater than or equal to 30° and less than or equal to 45°, for example, the included angle can be 30°, 35°, 40°, 42°, 44°, 45°, etc.

[0104] In the above scheme, by further optimizing the included angle between the extension direction of the first needle 320 and the ray emission direction, the blocking of the first needle 320 to the rays emitted by the ray source 210 can be further reduced, the influence of the first needle 320 on the visualization dynamic monitoring of the internal situation of the battery monomer 2 during the needle test is reduced, and at the same time, the image formed by the electrical signal converted by the ray detector 220 in the external control terminal can more clearly and completely present the situation of each component inside the battery monomer 2.

[0105] Please continue to refer to Figure 3 In some embodiments, the ray source 210 and the ray detector 220 are spaced apart along the first direction X2, and the carrier 100 is movably arranged between the ray source 210 and the ray detector 220 along the first direction X2.

[0106] Optionally, the battery needle test device 1 can further include a guide rail mechanism 400 arranged between the ray source 210 and the ray detector 220, the guide rail mechanism 400 extends along the first direction X2, and the carrier 100 is slidingly arranged on the guide rail mechanism 400 to move along the first direction X2 relative to the guide rail mechanism 400. Optionally, the guide rail mechanism 400 can play a guiding role during the movement of the carrier 100 along the first direction X2, or the guide rail mechanism 400 can also be used to drive the carrier 100 to move along the first direction X2.

[0107] It can be understood that there are various driving modes for the carrier 100, for example, the carrier 100 can be driven by the above-mentioned guide rail mechanism 400, or can be driven by other linear driving components such as a screw mechanism.

[0108] The distance between the battery monomer 2 on the carrier 100 and the ray source 210 can affect the imaging range and magnification of the internal structure of the battery monomer 2. When the distance between the battery monomer 2 and the ray source 210 is small, the magnification of the image formed after the rays emitted by the ray source 210 pass through the battery monomer 2 is larger, and the clarity of each structure displayed in the image is higher, but the imaging range is smaller, that is, fewer internal structures of the battery monomer 2 can be displayed in the image. When the distance between the battery monomer 2 and the ray source 210 is larger, the imaging range of the image formed after the rays emitted by the ray source 210 pass through the battery monomer 2 is larger, and more internal structures of the battery monomer 2 can be displayed in the image, but the magnification of the image is smaller, and the clarity of the imaging is lower.

[0109] In the above scheme, the distance between the ray source 210 and the corresponding battery monomer 2 can be adjusted by moving the battery monomer 2 on the carrier 100 along the first direction X2, so as to adjust the definition and imaging range of the formed image.

[0110] Please continue to refer to Figure 3 In some embodiments, the first needle-piercing mechanism 300 is located at one side of the carrier 100 along the second direction Y2, and the first driving assembly 310 includes a fifth driving member 315 for driving the first needle 320 to move along the first direction X2 which is perpendicular to the second direction Y2.

[0111] The first direction X2 and the second direction Y2 are two perpendicular directions, and the first direction X2 can be one of the length direction and the width direction of the carrier 100, and the second direction Y2 can be the other one.

[0112] It can be understood that if the first needle 320 pierces into the battery monomer 2 from above the carrier 100, when the needle-piercing test is performed on the second side of the square battery monomer 2, the rays emitted by the ray source 210 can need to pass through the battery monomer 2 from the top surface, the bottom surface or the first side of the square battery monomer 2, but it is difficult to pass through the battery monomer 2 from the second side. At this time, under the influence of the electrode terminal, the pressure relief mechanism, the tab and other components of the battery monomer 2, the finally formed image can be difficult to clearly and completely reflect the internal structure and airflow condition of the battery monomer 2, affecting the reliability of the failure mechanism analysis of the battery monomer 2.

[0113] Therefore, in the present embodiment, the first needle-piercing mechanism 300 is arranged at one side of the carrier 100 along the second direction Y2, so that the first needle 320 of the first needle-piercing mechanism 300 can pierce into the battery monomer 2 from the side of the carrier 100. For the square battery monomer 2, no matter which surface, the top surface, the bottom surface, the first side or the second side, is subjected to the needle-piercing test, the position of the battery monomer 2 can be adjusted so that the rays emitted by the ray source 210 pass through the battery monomer 2 from the second side, thereby reducing the influence of the electrode terminal, the pressure relief mechanism, the tab and other components on imaging, so that the formed image can clearly and completely reflect the internal structure of the battery monomer 2. Moreover, for other types of battery monomers 2 such as cylindrical battery monomers 2, by adjusting the position of the battery monomer 2, the finally formed image can also clearly and completely reflect the internal structure of the battery monomer 2, thereby improving the application range of the first needle-piercing mechanism 300.

[0114] The fifth driving member 315 is a driving component for driving the first needle 320 to move along the first direction X2. The fifth driving member 315 can be any one of a linear slide rail, a pneumatic cylinder, a hydraulic cylinder, a lead screw structure, or a combination structure of multiple driving components.

[0115] It can be understood that when the first driving assembly 310 further comprises the first driving member 311, the second driving member 312, the third driving member 313 and the fourth driving member 314, the fourth driving member 314 can be arranged between the fifth driving member 315 and the third driving member 313, the third driving member 313 is connected to the fifth driving member 315 through the fourth driving member 314, and the third driving member 313 can also be connected with the second driving member 312 and connected to the first lancet 320 through the second driving member 312 and the first driving member 311. At this time, the first lancet 320, the first driving member 311, the second driving member 312 and the third driving member 313 can rotate relative to the fifth driving member 315 around the rotation axis under the driving of the fourth driving member 314.

[0116] In some cases, the second direction Y2 can be parallel to the first displacement direction X1, and at this time, the first direction X2 can be parallel to one of the second displacement direction Y1 and the third displacement direction Z1, and the height direction of the carrier 100 can be parallel to the other. When the second direction Y2 is the width direction of the carrier 100, the first displacement direction X1 is the width direction of the carrier 100, one of the second displacement direction Y1 and the third displacement direction Z1 can be the height direction of the carrier 100, and the other can be the length direction of the carrier 100; when the second direction Y2 is the length direction of the carrier 100, the first displacement direction X1 is the length direction of the carrier 100, one of the second displacement direction Y1 and the third displacement direction Z1 can be the height direction of the carrier 100, and the other can be the width direction of the carrier 100.

[0117] In other cases, the second direction Y2 and the first displacement direction X1 can be two intersecting directions, and at this time, one of the second displacement direction Y1 and the third displacement direction Z1 can intersect the second direction Y2, and the other can be perpendicular to the second direction Y2.

[0118] In the above scheme, when the carrier 100 moves along the first direction X2 with the battery monomer 2 thereon, the first lancet 320 is driven to move along the first direction X2 by the fifth driving member 315, the position of the first lancet 320 along the first direction X2 can be adjusted, so that the first lancet 320 can be pierced into the battery monomer 2 from the preset position.

[0119] Please refer to Figure 4 In some embodiments, the battery needle puncture device 1 further comprises a second needle puncture mechanism 500, the second needle puncture mechanism 500 comprises a second driving assembly 510 and a second lancet 520, the second driving assembly 510 is used to drive the second lancet 520 to pierce into the battery monomer 2, wherein the first lancet 320 and the second lancet 520 are configured to pierce into the battery monomer 2 in different directions.

[0120] The second piercing mechanism 500 is a component for performing a piercing test on the battery cell 2. The second piercing mechanism 500 can be arranged in various positions, and can be arranged on the stage 100 or at least one side of the stage 100. The second piercing mechanism 500 includes a second driving assembly 510 and a second piercing needle 520. The second driving assembly 510 is a component for driving the second piercing needle 520 to move. The second piercing needle 520 is a component for piercing the battery cell 2 under the driving of the second driving assembly 510 to perform a piercing test on the battery cell 2. It should be noted that the second piercing needle 520 can be arranged to penetrate the battery cell 2, and the tip of the second piercing needle 520 can be arranged to penetrate the battery cell 2 from one surface of the battery cell 2 and extend out of another surface of the battery cell 2.

[0121] The extending direction of the second piercing needle 520 can be parallel to the horizontal direction, or can be parallel to the vertical direction. Alternatively, the extending direction of the second piercing needle 520 can be intersected with the horizontal direction or the vertical direction. When the battery cell 2 is arranged on the stage 100, the second piercing needle 520 can be arranged at any side of the battery cell 2 except the side in contact with the stage 100, and can be arranged to penetrate the battery cell 2 from any side of the battery cell 2 except the side in contact with the stage 100. For example, when the battery cell 2 includes a top surface, a bottom surface, and a plurality of side surfaces between the top surface and the bottom surface, the bottom surface of the battery cell 2 is in contact with the surface of the stage 100, and the second piercing needle 520 can be arranged to penetrate the battery cell 2 from the top surface or any one of the side surfaces of the battery cell 2. In addition, when performing a piercing test on the battery cell 2, the battery cell 2 can be flipped to allow the first piercing needle 320 to penetrate the battery cell 2 from a different surface, so as to comprehensively test the performance of the battery cell 2.

[0122] In some optional embodiments, the second piercing needle 520 can be arranged to be perpendicular to the surface of the battery cell 2 to be penetrated when penetrating the battery cell 2, i.e., the second piercing needle 520 is arranged to penetrate the battery cell 2 vertically, so as to improve the reliability of the piercing test.

[0123] In some optional embodiments, the second driving assembly 510 can drive the second piercing needle 520 to move along the extension direction of the second piercing needle 520, so that the second piercing needle 520 can be driven to pierce into the battery cell 2 along its own extension direction, which can reduce the risk of forming additional notches on the battery cell 2 when the second piercing needle 520 pierces into the battery cell 2. Optionally, the second driving assembly can also drive the second piercing needle 520 to move along other directions to adjust the position of the second piercing needle 520, and the other directions can be perpendicular to or intersect with the extension direction of the second piercing needle 520. It should be noted that the number of the second piercing mechanism 500 in the battery piercing device 1 can be one or more, and when the number of the second piercing mechanism 500 is more than one, the multiple second piercing mechanisms 500 can be used to simultaneously perform the piercing test on the same battery cell 2, or can be used to perform the piercing test on different battery cells 2.

[0124] The first piercing needle 320 and the second piercing needle 520 are configured to pierce into the battery cell 2 along different directions, that is, when the first piercing needle 320 and the second piercing needle 520 pierce into the battery cell 2 along their own extension directions, the extension direction of the first piercing needle 320 is different from the extension direction of the second piercing needle 520.

[0125] In the above scheme, the second piercing needle 520 of the second piercing mechanism 500 and the first piercing needle 320 of the first piercing mechanism 300 are configured to pierce into the battery cell 2 along different directions, and the first piercing needle 320 and the second piercing needle 520 can be used to perform the piercing test on different surfaces of the battery cell 2, or can be used to perform the piercing test on different battery cells 2, which can improve the flexibility of the battery piercing device 1. In actual use, appropriate piercing mechanisms can be selected for the piercing test according to the shape, structure and other actual conditions of the battery cell 2, so as to improve the test reliability of the piercing test and the detection reliability of the detection mechanism 200.

[0126] It can be understood that the detection mechanism 200 can be used to monitor the internal structure of the corresponding battery cell 2 during the piercing test of the battery cell 2 by the first piercing mechanism 300, or can be used to monitor the internal structure of the corresponding battery cell 2 during the piercing test of the battery cell 2 by the second piercing mechanism 500.

[0127] The second piercing mechanism 500 can be used to perform the piercing test on various battery cells 2, for example, the second piercing mechanism 500 can be used to perform the piercing test on cylindrical battery cells 2, or can be used to perform the piercing test on at least part of the surface of the square battery cell 2.

[0128] Please refer to Figure 5In some embodiments, the second driving assembly 510 includes a sixth driving member 511, a seventh driving member 512, and an eighth driving member 513. The sixth driving member 511 is connected with the second needle 520 and is configured to drive the second needle 520 to move in a third direction Z2. The seventh driving member 512 is connected with the sixth driving member 511 and the eighth driving member 513, and is configured to drive the second needle 520 to move in a second direction Y2. The eighth driving member 513 is configured to drive the second needle 520 to move in a first direction X2. The second direction Y2, the first direction X2, and the third direction Z2 are perpendicular to each other.

[0129] The second direction Y2 can be one of the length direction and the width direction of the platform 100, the first direction X2 can be the other direction, and the third direction Z2 can be the height direction of the platform 100.

[0130] The sixth driving member 511 is a driving component configured to drive the second needle 520 to move in the third direction Z2. The sixth driving member 511 can be directly connected with the second needle 520 or connected with the second needle 520 through other structures. The seventh driving member 512 is a driving component configured to drive the second needle 520 to move in the second direction Y2. The seventh driving member 512 is connected with the sixth driving member 511, so as to be connected with the second needle 520 through the sixth driving member 511. The eighth driving member 513 is a driving component configured to drive the second needle 520 to move in the first direction X2. The eighth driving member 513 is connected with the seventh driving member 512, so as to be connected with the second needle 520 through the seventh driving member 512 and the sixth driving member 511.

[0131] The sixth driving member 511, the seventh driving member 512, and the eighth driving member 513 can be the same driving component or different driving components. At least one of the sixth driving member 511, the seventh driving member 512, and the eighth driving member 513 can be any one of a linear slide rail, a pneumatic cylinder, a hydraulic cylinder, a lead screw structure, or a combination structure of multiple driving components.

[0132] It should be noted that the extension direction of the second needle 520 can be parallel to any one of the second direction Y2, the first direction X2, and the third direction Z2. For example, the extension direction of the second needle 520 can be parallel to the third direction Z2. When the battery monomer 2 is subjected to the needle puncture test, the position of the second needle 520 can be adjusted through the seventh driving member 512 and the eighth driving member 513, and then the second needle 520 can be driven to puncture the battery monomer 2 on the platform 100 in the direction close to the platform 100 through the sixth driving member 511.

[0133] In the above scheme, the sixth driving member 511, the seventh driving member 512, and the eighth driving member 513 drive the second needle 520 to move along the third direction Z2, the second direction Y2, and the first direction X2, which can adjust the depth of the second needle 520 piercing into the battery monomer 2, improve the flexibility of the needle-piercing test and the accuracy of the test result, and improve the test efficiency, and can also adjust the position of the second needle 520 piercing into the battery monomer 2, so that the second needle 520 can pierce into the battery monomer 2 from different points to more comprehensively evaluate the reliability of the battery monomer 2, and improve the flexibility and reliability of the needle-piercing test.

[0134] In some embodiments, one of the extension directions of the first needle 320 and the second needle 520 is parallel to the horizontal direction, and the other is parallel to the vertical direction.

[0135] The extension directions of the first needle 320 and the second needle 520 are perpendicular to each other, and one of them is parallel to the horizontal direction, and the other is parallel to the vertical direction. It can be understood that the first needle 320 and the second needle 520 both vertically pierce into the surface to be pierced of the battery monomer 2, and when one of the extension directions of the first needle 320 and the second needle 520 is parallel to the horizontal direction, and the other is parallel to the vertical direction, the battery monomer 2 can be vertically or horizontally placed on the bearing surface of the stage 100, without tilting, which can improve the positioning accuracy of the battery monomer 2, and can also reduce the requirement for the positioning clamp of the battery monomer 2.

[0136] In the above scheme, one of the extension directions of the first needle 320 and the second needle 520 is parallel to the horizontal direction, and the other is parallel to the vertical direction, that is, one of the first needle 320 and the second needle 520 can pierce into the battery monomer 2 along the horizontal direction, and the other can pierce into the battery monomer 2 along the vertical direction, and at this time, the battery monomer 2 can be vertically or horizontally placed on the stage 100, without tilting, which can reduce the positioning difficulty of the battery monomer 2, help to improve the positioning accuracy of the battery monomer 2, and can also reduce the assembly difficulty of the battery monomer 2, and reduce the requirement for the positioning clamp of the battery monomer 2.

[0137] In some optional embodiments, the extension direction of the first needle 320 can be parallel to the horizontal direction, and the first needle 320 can pierce into the battery monomer 2 on the stage 100 from the side of the stage 100. The extension direction of the second needle 520 can be parallel to the vertical direction, and the second needle 520 can pierce into the battery monomer 2 on the stage 100 from above the stage 100.

[0138] In some embodiments, the ray source 210 is a micro-focus ray source, a diameter of a focal point of the ray source 210 is less than or equal to 1 millimeter; and / or, a frame rate of the ray detector 220 is greater than or equal to 25 frames per second.

[0139] The micro-focus ray source is a high-precision and high-efficiency non-destructive testing tool, which is used to emit rays capable of penetrating the battery monomer 2 on the loading platform 100 to the ray detector 220. The diameter of the focal point of the ray source 210 can affect the divergence of the ray beam and the geometric clarity of the final imaging. The smaller the diameter of the focal point, the higher the clarity of the final imaging. The diameter of the focal point of the ray source 210 is less than or equal to 1 millimeter, for example, the diameter of the focal point of the ray source 210 can be 0.1 millimeter, 0.2 millimeter, 0.5 millimeter, 0.7 millimeter, 0.9 millimeter or 1 millimeter, etc. The frame rate of the ray detector 220 can affect the ability of the ray detector 220 to capture rays. Setting the ray detector 220 to have a higher frame rate can enable the ray detector 220 to capture more image frames per second, achieve more smooth and continuous imaging, while reducing blurred motion in imaging, and improve the clarity and quality of imaging. The frame rate of the ray detector 220 is greater than or equal to 25 frames per second, for example, the frame rate of the ray detector 220 can be 25 frames per second, 40 frames per second, 60 frames per second, 70 frames per second or 100 frames per second, etc.

[0140] In the above scheme, the ray source 210 is set to be a micro-focus ray source, and the diameter of the focal point of the ray source 210 is less than or equal to 1 millimeter, which can improve the clarity of the image formed after the rays penetrate the battery monomer 2, and is conducive to improving the accuracy of the failure mechanism analysis of the battery monomer 2. The frame rate of the ray detector 220 is greater than or equal to 25 frames per second, which is helpful to realize high-frame-rate dynamic imaging, which can capture smooth and clear dynamic images, and further improve the accuracy of the failure mechanism analysis of the battery monomer 2.

[0141] In some embodiments, the frame rate is greater than or equal to 30 frames per second.

[0142] The frame rate of the ray detector 220 is greater than or equal to 30 frames per second, for example, the frame rate of the ray detector 220 can be 30 frames per second, 40 frames per second, 60 frames per second, 70 frames per second or 100 frames per second, etc.

[0143] In the above scheme, the frame rate of the ray detector 220 is further optimized, which is helpful to realize higher-frame-rate dynamic imaging, so that the ray detector 220 can capture more smooth and clear dynamic images, and further improve the accuracy of the failure mechanism analysis of the battery monomer 2.

[0144] In a second aspect, the embodiments of the present application provide a battery testing system, which comprises the battery needle puncture device 1 of any one of the above.

[0145] The battery testing system provided by the embodiments of the present application has the technical effects of the technical solutions of the battery needle puncture device 1 in any of the above embodiments, and the explanations of the structures and terms that are the same as or corresponding to those in the above embodiments will not be repeated here.

[0146] In some embodiments, the battery needle puncture device provided by the embodiments of the present application comprises a carrier 100, a detection mechanism 200 and a first needle puncture mechanism 300. The carrier 100 is used to carry a battery monomer 2. The detection mechanism 200 comprises a ray source 210 and a ray detector 220. The ray source 210 is used to emit rays that pass through the battery monomer 2. The ray detector 220 is used to receive the rays emitted by the ray source 210 and form an electrical signal. The first needle puncture mechanism 300 comprises a first driving assembly 310 and a first needle 320. The first driving assembly 310 is used to drive the first needle 320 to puncture the battery monomer 2. The first driving assembly 310 comprises a first driving member 311, a second driving member 312 and a third driving member 313. The first driving member 311 is connected with the first needle 320 and is used to drive the first needle 320 to move along a first displacement direction X1. The second driving member 312 is connected with the first driving member 311 and is used to drive the first needle 320 to move along a second displacement direction Y1. The third driving member 313 is connected with the second driving member 312 and is used to drive the first needle 320 to move along a third displacement direction Z1. The first displacement direction X1 is the extension direction of the first needle 320, and the first displacement direction X1, the second displacement direction Y1 and the third displacement direction Z1 are arranged perpendicularly two by two. The first driving assembly 310 further comprises a fourth driving member 314. The fourth driving member 314 is used to drive the first needle 320 to rotate around a rotation axis. The extension direction of the rotation axis is perpendicular to the extension direction of the first needle 320. The ray source 210 and the ray detector 220 are arranged perpendicularly two by two. The carrier 100 is arranged between the ray source 210 and the ray detector 220 and is movable along the first direction X2. The first direction X2 is the length direction or the width direction of the carrier 100. The first needle puncture mechanism 300 is located on one side of the carrier 100 along the second direction Y2. The first driving assembly 310 comprises a fifth driving member 315. The fifth driving member 315 is used to drive the first needle 320 to move along the first direction X2.

[0147] And the battery needle device 1 further comprises a second needle mechanism 500, the second needle mechanism 500 comprises a second driving assembly 510 and a second needle 520, the second driving assembly 510 is used to drive the second needle 520 to be pierced into the battery monomer 2, wherein the first needle 320 and the second needle 520 are configured to be pierced into the battery monomer 2 in different directions. The second driving assembly 510 comprises a sixth driving piece 511, a seventh driving piece 512 and an eighth driving piece 513, the sixth driving piece 511 is connected with the second needle 520, for driving the second needle 520 to move along a third direction Z2, the seventh driving piece 512 is connected with the sixth driving piece 511 and the eighth driving piece 513 respectively, for driving the second needle 520 to move along a second direction Y2, the eighth driving piece 513 is used to drive the second needle 520 to move along a first direction X2, and the second direction Y2, the first direction X2 and the third direction Z2 are perpendicular to each other.

[0148] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery needling apparatus, characterized in that, The battery needle puncture device comprises: a carrier for carrying a battery cell; a detection mechanism comprising a radiation source for emitting radiation through the battery cell and a radiation detector for receiving the radiation emitted by the radiation source and forming an electrical signal; a first needle puncture mechanism comprising a first driving assembly and a first needle, the first driving assembly being configured to drive the first needle to puncture the battery cell.

2. The battery pricking device of claim 1, wherein, The first driving assembly comprises a first driving member and a second driving member, the first driving member being connected with the first needle and configured to drive the first needle to move in a first displacement direction, the second driving member being connected with the first driving member and configured to drive the first needle to move in a second displacement direction, the first displacement direction being a direction in which the first needle extends and being perpendicular to the second displacement direction.

3. The battery needle stick device of claim 2, wherein, The first driving assembly further comprises a third driving member, the third driving member being connected with the second driving member and configured to drive the first needle to move in a third displacement direction, the first displacement direction, the second displacement direction and the third displacement direction being arranged perpendicularly to each other.

4. The battery needle stick device of claim 1, wherein, The first driving assembly comprises a fourth driving member, the fourth driving member being configured to drive the first needle to rotate about a rotation axis, the rotation axis extending in a direction perpendicular to the direction in which the first needle extends.

5. The battery needle stick device of claim 1, wherein, The radiation source and the radiation detector are located on two sides of the carrier along a first direction, and the direction in which the first needle extends intersects the first direction.

6. The battery needle stick device of claim 5, wherein, An included angle a between the direction in which the first needle extends and the first direction satisfies 20°≤a≤60°.

7. The battery needle stick device of claim 6, wherein, The included angle a satisfies 30°≤a≤45°.

8. The battery needle stick device of claim 1, wherein, The radiation source and the radiation detector are arranged at intervals along a first direction, and the carrier is arranged movably along the first direction between the radiation source and the radiation detector.

9. The battery needle stick device of claim 8, wherein, The first needle puncture mechanism is located on one side of the carrier along a second direction, and the first driving assembly comprises a fifth driving member, the fifth driving member being configured to drive the first needle to move along the first direction, the first direction being perpendicular to the second direction.

10. The battery needling device of any one of claims 1-9, wherein, The battery needle puncture device further comprises a second needle puncture mechanism, the second needle puncture mechanism comprising a second driving assembly and a second needle, the second driving assembly being configured to drive the second needle to puncture the battery cell, wherein the first needle and the second needle are configured to puncture the battery cell in different directions.

11. The battery needle stick device of claim 10, wherein, The second driving assembly comprises a sixth driving member, a seventh driving member and an eighth driving member, the sixth driving member being connected with the second needle and configured to drive the second needle to move in a third direction, the seventh driving member being connected with the sixth driving member and the eighth driving member respectively and configured to drive the second needle to move in a second direction, and the eighth driving member being configured to drive the second needle to move in a first direction, the second direction, the first direction and the third direction being arranged perpendicularly to each other.

12. The battery needle stick device of claim 10, wherein, One of the direction in which the first needle extends and the direction in which the second needle extends is parallel to a horizontal direction, and the other is parallel to a vertical direction.

13. The battery needle stick device of any of claims 1-9, wherein, The radiation source is a microfocus radiation source, the diameter of the focal point of the radiation source being less than or equal to 1 mm; and / or the frame rate of the radiation detector is greater than or equal to 25 frames per second.

14. A battery testing system, comprising: A battery needle stick device comprising the needle stick device of any of claims 1-13.

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