Battery cell short circuit detection mechanism

Abstract

The application discloses a kind of electric core short circuit detection mechanism, it is related to lithium battery detection technical field, including rack, first probe component, second probe component, drive assembly;The first probe of first probe component and pad are used to clamp the pole lug of the positive pole of electric core, and at least part of first probe component is used to abut the end surface of the positive pole of electric core;Second probe and the negative pole of electric core form electric connection;Drive assembly is driving connection with at least one of first probe component and second probe component, and drive assembly is used to drive driven probe component to move in vertical direction to electric core;Driven probe component includes flexible structure, and flexible structure is used to absorb the continued driving stroke of drive assembly after driven probe component contacts electric core, by first probe and pad clamp pole lug, second probe abuts negative pole, realizes stable electric connection, while avoiding damaging electric core, improves test structure stability and reliability.

Description

Technical Field

[0001] This application relates to the field of lithium battery testing technology, and in particular to a cell short-circuit testing mechanism. Background Technology

[0002] Traditional battery cell short-circuit testing methods use small cylindrical probes at both ends of the battery cell to test for short circuits. When the upper and lower probes approach each other to contact the battery cell, the battery cell floats, causing the position to be different each time. The unstable position leads to unstable electrical connections and affects the test results. On the other hand, the probes that hold the battery cell are very likely to damage the center hole of the battery cell, causing even qualified battery cells to be judged as unqualified products, thus reducing the product pass rate. Summary of the Invention

[0003] To solve at least one of the above-mentioned technical problems, this application provides a cell short-circuit detection mechanism, and the technical solution adopted is as follows.

[0004] The cell short-circuit detection mechanism provided in this application includes: frame; A first probe assembly is disposed on the frame and used to be disposed above the battery cell. The first probe assembly includes a pad and a first probe. The first probe and the pad are used to clamp the tab of the positive electrode of the battery cell. The first probe and the pad respectively contact the opposite sides of the tab to form an electrical connection. At least a portion of the first probe assembly is used to abut the end face of the positive electrode of the battery cell. The second probe assembly is disposed on the frame and located below the first probe assembly. The second probe assembly includes a second probe for forming an electrical connection with the negative terminal of the battery cell. A drive assembly is disposed on the frame and is drively connected to at least one of the first probe assembly and the second probe assembly. The drive assembly is used to drive the corresponding probe assembly to move vertically toward the cell. The driven probe assembly includes a flexible structure that absorbs the continued driving stroke of the driving assembly after the driven probe assembly contacts the battery cell.

[0005] In some embodiments of this application, the first probe assembly includes a stop structure, the lower end face of which is used to abut the end face of the positive electrode of the battery cell at a preset height.

[0006] In some embodiments of this application, the first probe assembly includes a clamping structure, the clamping structure including the pad and the first probe; the clamping structure further includes a first driving structure, the first driving structure being used to drive the first probe and the pad to move relatively apart in the horizontal direction to form a space for clamping the tab, and to move relatively closer to clamp the tab; the distance between the abutting surface of the stop structure and the lower end surface of the first probe is less than the protrusion length of the tab.

[0007] In some embodiments of this application, the driving component is drively connected to the first probe component; the first probe component includes a first sliding structure and a first flexible structure, the first sliding structure is disposed on the frame, and the driving component is connected to the first sliding structure; the first flexible structure includes a first connecting plate, a first connecting rod, and a first spring, the first connecting plate is connected to the first sliding structure and can slide relative to the frame in the vertical direction; the first connecting plate has a first through hole, one end of the first connecting rod is connected to the stop structure, the other end passes through the first through hole and is provided with a first limiting structure, the first spring is sleeved on the first connecting rod and disposed between the stop structure and the first connecting plate, and the first limiting structure is used to restrict the first connecting rod from disengaging from the first through hole.

[0008] In some embodiments of this application, the driving component is drive-connected to the second probe component; the second probe component includes a second sliding structure and a second flexible structure, the second sliding structure is disposed on the frame, and the driving component is connected to the second sliding structure; the second flexible structure includes a second connecting plate, a second connecting rod, and a second spring, the second connecting plate is connected to the second sliding structure and can slide relative to the frame in the vertical direction; the second connecting plate has a second through hole, one end of the second connecting rod is provided with the second probe, the other end of the second connecting rod passes through the second through hole and is provided with a second limiting structure, the second spring is sleeved on the second connecting rod and disposed between the second probe and the second connecting plate, and the second limiting structure is used to restrict the second connecting rod from disengaging from the second through hole.

[0009] In some embodiments of this application, the driving component can simultaneously drive the first probe component and the second probe component to move relative to each other in the vertical direction, wherein the first probe is used to approach the positive end of the battery cell and the second probe is used to approach the negative end of the battery cell.

[0010] In some embodiments of this application, the driving component includes a second driving structure, a first connector, a second connector, a third connector, and a fourth connector; One end of the first connector is connected to the second drive structure; The second connector is hinged to the frame. The second connector has a first connecting part and a second connecting part. The projections of the first connecting part and the second connecting part onto the plane where the hinge of the second connector is located can swing in opposite directions with the hinge of the second connector as the center of rotation. The other end of the first connector is hinged to the first connecting part; One end of the third connector is hinged to the second connector, and the other end of the third connector is connected to the second sliding structure; One end of the fourth connector is connected to the second connector, and the other end of the fourth connector is connected to the first sliding structure. The fourth connector is used to have the same movement trend as the first connector and to have the opposite movement trend to the third connector.

[0011] In some embodiments of this application, the second drive structure includes a cam, a swing arm, a drive motor, and an elastic element; one end of the swing arm is hinged to the frame, and the other end is a movable end; the cam is connected to the drive motor, and the outer edge of the cam abuts against one side of the swing arm; one end of the elastic element is connected to the frame, and the other end is connected to the movable end of the swing arm; wherein, the cam and the elastic element are respectively used to cause the movable end of the swing arm to move in opposite directions around its hinge point.

[0012] In some embodiments of this application, the first sliding structure includes a first linear slide rail disposed on the frame and arranged in a vertical direction, and the first connecting plate is slidably engaged with the first linear slide rail; the second sliding structure includes a second linear slide rail disposed on the frame and arranged in a vertical direction, and the second connecting plate is slidably engaged with the second linear slide rail.

[0013] In some embodiments of this application, the first sliding structure further includes a first sliding plate and a second sliding plate, the first sliding plate and the first linear slide rail are slidably engaged, the first sliding plate and the second sliding plate are detachably connected, and the second sliding plate is connected to the first connecting plate; one of the first sliding plate and the second sliding plate is provided with a scale, and the other is provided with a pointer.

[0014] This application has at least the following beneficial effects: The first probe assembly and the second probe assembly of this application each integrate a corresponding probe, and the first probe is dedicated to electrical connection with the positive electrode of the battery cell, and the second probe is dedicated to electrical connection with the negative electrode of the battery cell, thus achieving a dedicated adaptation for the electrical connection of the positive and negative electrodes of the battery cell in terms of structure; at least a portion of the first probe assembly abuts against the positive terminal face of the battery cell, and the first probe and the pad can clamp the electrode tab, while the second probe abuts against the negative electrode of the battery cell, so that the battery cell can maintain a stable electrical connection during each short circuit test, which can improve the stability and reliability of the test results and ensure the adaptability of the contact position between the probe and the battery cell; the drive assembly is installed on the frame and is drivenly connected to at least one of the first and second probe assemblies, and the flexible structure can absorb the continued driving stroke of the drive assembly after the probe assembly contacts the battery cell, realizing flexible contact between the probe assembly and the battery cell, which not only ensures the continuous stability of the electrical connection between the probe and the battery cell, but also buffers the contact pressure and protects the structural integrity of the probe assembly and the battery cell.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0017] Figure 1 This is a first-view view of a cell short-circuit detection mechanism in one embodiment of this application; Figure 2 This is a second-view view of a cell short-circuit detection mechanism in one embodiment of this application; Figure 3 for Figure 1 Enlarged view of point a in the middle; Figure 4 This is a third-view diagram of a cell short-circuit detection mechanism in one embodiment of this application; Figure 5 This is a schematic diagram of the second sliding structure of the cell short-circuit detection mechanism in one embodiment of this application.

[0018] Reference numerals: Frame 100; First mounting base 110; Second mounting base 120; First probe assembly 200; clamping structure 210; first probe 211; pad 212; first drive structure 213; first sliding structure 220; first sliding plate 221; pointer 222; first linear slide rail 223; first flexible structure 230; first connecting plate 231; first connecting rod 232; first spring 233; first washer 234; stop structure 240; stop connector 241; Second probe assembly 300; second sliding structure 310; slide rail connecting plate 311; second linear slide rail 312; second flexible structure 320; second connecting plate 321; second connecting rod 322; second spring 323; second probe 324; nut 325; 400 cells; Drive assembly 500; second drive structure 510; cam 511; swing arm 512; drive motor output end 513; elastic element 514; first connector 520; second connector 530; first connecting part 531; second connecting part 532; third connecting part 533; third connector 540; fourth connector 550. Detailed Implementation

[0019] The following is combined Figures 1 to 5 The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the cell short-circuit detection mechanism provided in this application includes: 100 racks; A first probe assembly 200 is disposed on a frame 100 and is used to be disposed above a battery cell 400. The first probe assembly 200 includes a pad 212 and a first probe 211. The first probe 211 and the pad 212 are used to clamp the tab of the positive electrode of the battery cell 400. The first probe 211 and the pad 212 respectively contact the opposite sides of the tab to form an electrical connection. At least a portion of the first probe assembly 200 is used to abut against the end face of the positive electrode of the battery cell 400. The second probe assembly 300 is disposed on the frame 100 and located below the first probe assembly 200. The second probe assembly 300 includes a second probe 324, which is used to form an electrical connection with the negative terminal of the battery cell 400. A drive assembly 500 is disposed on the frame 100. The drive assembly is connected to at least one of the first probe assembly 200 and the second probe assembly 300. The drive assembly is used to drive the corresponding probe assembly to move vertically toward the cell 400. The driven probe assembly includes a flexible structure that absorbs the continued driving stroke of the driving assembly 500 after the driven probe assembly contacts the cell 400.

[0025] The axis of the battery cell 400 is a vertical line, and the battery cell 400 to be tested is fixed to the frame 100 or other components. The drive assembly 500 can drive the first probe assembly 200 and / or the second probe assembly 300 to move closer to or further away from the battery cell 400 in the vertical direction. The following description takes the battery cell 400 placed vertically as an example.

[0026] This application uses a frame 100 as the overall mounting and support base. A first fixing base 110 is provided on the frame 100, which provides the mounting and support base for the first probe assembly 200 and the second probe assembly 300. The first probe assembly 200 includes a first probe 211, which is positioned above the cell 400 clamping position. The first probe 211 cooperates with a pad 212 to clamp the tab of the positive electrode of the cell 400. The second probe assembly 300 includes a second probe 324, which is positioned below the cell 400 clamping position. The second probe 324 moves upward to contact the negative electrode of the cell 400.

[0027] The driving component 500 is connected to at least one of the first probe component 200 and the second probe component 300. The driving component 500 can output a linear driving force to drive the connected probe component to move linearly towards the cell 400 in a preset vertical direction until the probe of the probe component contacts the corresponding electrode of the cell 400.

[0028] The first probe 211 and the pad 212 are used to contact the opposite sides of the electrode tab when clamping the electrode tab. The first probe 211 is a block-shaped, highly conductive structure with a flat contact end face facing the electrode tab of the battery cell 400, parallel to the plane of the electrode tab. The pad 212 is an insulating and wear-resistant structure, arranged opposite to the first probe 211, forming a clamping position adapted to the positive electrode tab of the battery cell 400. When the first probe assembly 200 moves vertically towards the battery cell 400 to a preset position, the clamping position is open, and the positive electrode tab of the battery cell 400 extends into the clamping position between the first probe 211 and the pad 212. The pad 212 is in contact with one side surface of the positive electrode tab, and the block-shaped first probe 211 is in contact with the other side surface of the positive electrode tab. Through the clamping cooperation of the two, the first probe 211 and the positive electrode tab of the battery cell 400 form a surface contact electrical connection, realizing the positive conduction of the short-circuit detection circuit. The first probe 211 is designed as a block structure, which, together with the pad 212, forms a clamping contact, replacing the top-pressing contact of the traditional needle probe. Structurally, this avoids the probe from puncturing or pressing the positive electrode tab and center hole of the battery cell 400, effectively protecting the integrity of the positive electrode structure of the battery cell 400.

[0029] The driven probe assembly integrates a flexible structure. If both probe assemblies are driven, each probe assembly is configured with a corresponding flexible structure. The flexible structure is arranged vertically. When the driven probe assembly contacts the cell 400, if the driving assembly 500 continues to output power to form a continued driving stroke, the flexible structure will undergo elastic deformation to completely absorb the continued driving stroke, so that the probe assembly and the cell 400 always maintain flexible contact.

[0030] The basic workflow of this application is as follows: After placing the battery cell 400 at the testing station, the drive assembly 500 is activated according to the placement state of the battery cell 400, driving the corresponding probe assembly to move vertically toward the battery cell 400; at least a portion of the first probe assembly 200 first comes into contact with the battery cell 400, limiting the approach stroke of the first probe assembly 200, and the first probe 211 and the pad 212 clamp the electrode tab; the probe of the driven probe assembly contacts the corresponding electrode of the battery cell 400, and the flexible structure absorbs the continued driving stroke of the drive assembly 500; finally, the first probe 211 and the second probe 324 form an electrical connection with the positive and negative electrodes of the battery cell 400 respectively, and the short circuit detection circuit is turned on to complete the short circuit detection of the battery cell 400.

[0031] The first probe assembly 200 and the second probe assembly 300 of this application each integrate a corresponding probe. The first probe 211 is dedicated to electrical connection with the positive terminal of the battery cell 400, and the second probe 324 is dedicated to electrical connection with the negative terminal of the battery cell 400, thus achieving a dedicated adaptation for the electrical connection of the positive and negative terminals of the battery cell 400. At least a portion of the first probe assembly 200 abuts against the positive terminal face of the battery cell 400, and the first probe 211 and the pad 212 can clamp the electrode tab. The second probe 324 abuts against the negative terminal of the battery cell 400, ensuring that the battery cell 400 maintains a stable electrical connection during each short circuit test. This will cause the probe to detach from the cell 400, which can improve the stability and reliability of the test results and ensure the compatibility of the contact position between the probe and the cell 400. The drive assembly is mounted on the frame and is connected to at least one of the first and second probe assemblies. The flexible structure can absorb the continued drive stroke of the drive assembly after the probe assembly contacts the cell, realizing flexible contact between the probe assembly and the cell 400. This not only ensures the continuous stability of the electrical connection between the probe and the cell 400, but also buffers the contact pressure, avoids damage to the center hole of the cell 400, and protects the structural integrity of the probe assembly and the cell 400.

[0032] In some other embodiments, the first probe 211 may also be a horizontally positioned cylindrical probe.

[0033] In some embodiments, the first probe assembly 200 includes a stop structure 240, the lower end face of which is used to abut against the end face of the positive electrode of the battery cell 400 at a preset height. The stop structure 240 is disposed on the first probe assembly 200, and its lower end face is an abutment surface located on a horizontal plane, used to abut against the upper end face of the battery cell 400. Specifically, the abutment surface is provided with a flexible gasket to avoid rigid contact with the battery cell 400. The stop structure 240 is fixedly assembled to the side of the first probe assembly 200 facing the battery cell 400 via a stop connector 241. The preset height is the height of the horizontal plane where the positive end face of the battery cell 400 is located. If the first probe assembly 200 is driven, before the first probe assembly 200 moves toward the battery cell 400 and forms an electrical connection, the contact surface of the stop structure 240 first precisely contacts the body of the battery cell 400 to achieve a pre-limit of the stroke of the first probe assembly 200; if the first probe assembly 200 is fixed, the stop structure 240 serves as a positioning reference.

[0034] Combination Figure 2 As shown, in some embodiments, the first probe assembly 200 includes a clamping structure 210 for clamping the tab of the positive electrode of the battery cell 400 to form an electrical connection; the clamping structure 210 includes a pad 212 and a block-shaped first probe 211, and the clamping structure 210 also includes a first driving structure 213 for driving the first probe and the pad to move relatively far apart in the horizontal direction to form a space for clamping the tab, and relatively close together to clamp the tab; the distance between the abutting surface of the stop structure 240 and the end face of the first probe 211 for approaching the positive electrode of the battery cell 400 is less than the extension length of the tab. The end face of the first probe 211 and the end face of the pad 212 are both parallel to the plane where the tab is located. The first driving structure 213 is used to drive the first probe 211 and the pad 212 to move closer or further apart in the horizontal direction. The straight distance between the contact surface of the stop structure 240 and the lower end face of the first probe 211 is less than the length of the positive electrode tab of the battery cell 400 extending from the end face of the battery cell. This ensures that when the first probe assembly 200 moves toward the battery cell 400, the stop structure 240 first contacts the end face of the battery cell 400 before performing the tab clamping operation, ensuring that the positive electrode tab can smoothly extend into the clamping space and improving the accuracy of the clamping operation.

[0035] Specifically, the first drive structure 213 is a pneumatic gripper controlled by a solenoid valve, with its two gripper output ends connected to the first probe 211 and the pad 212, respectively. After the test is completed, the solenoid valve controls the pneumatic gripper to release, thereby releasing the electrode tabs, allowing the battery cell 400 to move out of the test position.

[0036] Combination Figure 2As shown, in some embodiments, the driving component is connected to the first probe component 200 in a transmission manner; the first probe component 200 includes a first sliding structure 220 and a first flexible structure 230, the first sliding structure 220 is disposed on the frame 100, and the driving component 500 is connected to the first sliding structure 220; the first flexible structure 230 includes a first connecting plate 231, a first connecting rod 232 and a first spring 233, the first connecting plate 231 is connected to the first sliding structure 220 and can slide relative to the frame 100 in the vertical direction; the first connecting plate 231 has a first through hole, one end of the first connecting rod 232 is connected to the stop structure 240, the other end passes through the first through hole and is provided with a first limiting structure, the first spring 233 is sleeved on the first connecting rod 232 and is disposed between the stop structure 240 and the first connecting plate 231, and the first limiting structure is used to restrict the first connecting rod from disengaging from the first through hole.

[0037] The output end of the drive assembly 500 is connected to the first sliding structure 220. The first sliding structure 220 causes the first flexible structure 230, the clamping structure 210, and the stop structure 240 to move synchronously towards or away from the battery cell 400 in the vertical direction. The first limiting structure is the structure at the end of the first connecting rod 232, and its maximum length in the horizontal plane is greater than the diameter of the first through hole. Specifically, it is a circular plate structure with a diameter greater than the diameter of the first through hole. The first spring 233 is used to provide pressure. When the stop structure 240 contacts the end face of the battery cell 400, if the stop structure 240 and the battery cell 400 tend to move further closer, the first limiting structure tends to move away from the first through hole. The first spring 233 is compressed and acts as a compression spring to provide pressure, thereby absorbing the continued driving stroke and preventing damage to the battery cell 400.

[0038] Furthermore, a first gasket 234 is provided between the first limiting structure and the first connecting plate 231. The first gasket 234 is sleeved on the first connecting rod 232, which can prevent wear between the first limiting structure and the first connecting plate 231.

[0039] In some embodiments, the first sliding structure 220 includes a first linear slide rail 223 disposed on the frame 100 and arranged in a straight line along the vertical direction, and the first connecting plate 231 is slidably engaged with the first linear slide rail 223; the second sliding structure 310 includes a second linear slide rail 312 disposed on the frame 100 and arranged in a straight line along the vertical direction, and the second connecting plate 321 is slidably engaged with the second linear slide rail 312.

[0040] Specifically, the first sliding structure 220 also includes a first sliding plate 221 and a second sliding plate. The first sliding plate 221 and the first linear slide rail 223 are slidably engaged. The first sliding plate 221 and the second sliding plate are detachably connected. The second sliding plate is connected to the first connecting plate 231. One of the first sliding plate 221 and the second sliding plate is provided with a scale, and the other is provided with a pointer.

[0041] The first sliding structure 220 includes a first linear slide rail 223 arranged on the frame 100 along a vertical straight line and a first sliding plate 221 that slides in cooperation with the first linear slide rail 223. The first sliding plate 221 is provided with a groove and is sleeved on the first linear slide rail 223. The first sliding structure 220 also includes a second sliding plate, which is provided with an oblong hole. A bolt passes through the oblong hole to fix the second sliding plate to one side of the first sliding plate 221. A third sliding structure is provided on the side of the second sliding plate away from the first sliding plate 221. The third sliding structure includes a third linear slide rail and a third sliding plate. The third sliding plate has a groove and is fitted onto the third linear slide rail. A first connecting plate 231 is horizontally disposed at the top of the second sliding plate. The stop connector 241 is a multi-segment plate structure, including a vertical plate connected to one side of the third sliding plate. One end of the first connecting rod 232 is connected to the vertical plate. During the contraction and extension of the first spring 233, the vertical plate and the first connecting rod 232 move along the third linear slide rail. The output end of the drive assembly 500 is connected to the second sliding plate. Before this application is implemented, the position of the bolt passing through the waist-shaped hole is adjusted to fix the first sliding plate 221 and the second sliding plate. When the drive assembly 500 drives the first probe assembly 200, its output end pulls the second sliding plate. The first sliding plate 221, the second sliding plate and the third sliding plate move synchronously. When the first spring 233 is compressed, the third sliding plate and the second sliding plate slide relative to each other.

[0042] Specifically, the first sliding plate 221 is provided with a scale, and the second sliding plate is provided with a pointer 222 on one side. When adjusting the position of the bolt passing through the waist-shaped hole, the scale and pointer 222 work together to make the distance between the lower end face of the stop structure 240 and the plane where the first probe 211 is used to contact the upper end face of the battery cell 400 more accurate, so as to ensure that the battery cell 400 tab can enter the clamping position without damaging the battery cell 400.

[0043] Combination Figure 2 , Figure 5As shown, in some embodiments, the drive assembly 500 is drively connected to the second probe assembly 300; the second probe assembly 300 includes a second sliding structure 310 and a second flexible structure 320. The second sliding structure 310 is disposed on the frame 100, and the drive assembly is connected to the second sliding structure 310; the second flexible structure 320 includes a second connecting plate 321, a second connecting rod 322, and a second spring 323. The second connecting plate 321 is connected to the second sliding structure 310 and can slide relative to the frame 100 in the vertical direction; the second connecting plate 321 has a second through hole, one end of the second connecting rod 322 is provided with a second probe 324, the other end of the second connecting rod 322 passes through the second through hole and is provided with a second limiting structure, the second spring 323 is sleeved on the second connecting rod 322 and disposed between the second probe 324 and the second connecting plate 321, and the second limiting structure is used to restrict the second connecting rod 322 from disengaging from the second through hole. The second probe 324 is a cylindrical probe and is disposed on the top of the second connecting rod 322 near the top of the cell 400.

[0044] The output end of the drive assembly 500 is connected to the second sliding structure 310, which causes the second flexible structure 320 to move closer to or further away from the battery cell 400 in the vertical direction. The second limiting structure is the structure at the end of the second connecting rod 322 away from the battery cell 400, and its maximum length in the horizontal plane is greater than the diameter of the second through hole. Specifically, the side wall of the end of the second connecting rod 322 away from the battery cell 400 is provided with external threads. The second limiting structure is a nut 325, the diameter of which is greater than the diameter of the second through hole. The second spring 323 is used to provide pressure. When the second probe 324 contacts the negative end face of the battery cell 400, if the second probe 324 tends to move further closer to the battery cell 400, the second limiting structure tends to move away from the second through hole. The second spring 323 is compressed and acts as a compression spring to provide pressure, thereby absorbing the continued driving stroke and avoiding damage to the battery cell 400.

[0045] Furthermore, a second gasket is provided between the second limiting structure and the second connecting plate 321. The second gasket is sleeved on the second connecting rod 322, which can prevent wear between the second limiting structure and the second connecting plate 321.

[0046] Specifically, the second sliding structure 310 includes a second linear slide rail 312 arranged vertically on the frame 100 and a slide rail connecting plate 311 that slides with the second linear slide rail 312. The slide rail connecting plate 311 is provided with a groove and is sleeved on the second linear slide rail 312. The second connecting plate 321 is connected to the slide rail connecting plate 311.

[0047] In some embodiments, the drive assembly 500 can simultaneously drive the first probe assembly 200 and the second probe assembly 300 to move relative to each other in the vertical direction. The first probe 211 is positioned near the positive terminal of the battery cell 400, and the second probe 324 is positioned near the negative terminal of the battery cell 400. The output end of the drive assembly 500 is connected to the first sliding structure 220 of the first probe assembly 200 and the second sliding structure 310 of the second probe assembly 300 respectively via a synchronous transmission structure. This synchronous transmission structure ensures that the power output by the drive assembly 500 is synchronously transmitted to the two sliding structures. Synchronous bidirectional driving of the two probe assemblies is achieved by the same drive assembly 500, eliminating the need for multiple additional drive sources and simplifying the overall transmission structure of the mechanism.

[0048] In some embodiments, the drive assembly 500 includes a second drive structure 510, a first connector 520, a second connector 530, a third connector 540, and a fourth connector 550; one end of the first connector 520 is connected to the second drive structure 510; the second connector 530 is hingedly disposed on the frame 100, and the second connector 530 has a first connecting portion 531 and a second connecting portion 532, the projections of the first connecting portion 531 and the second connecting portion 532 onto the plane where the second connector 530 is hinged are such that the second connector 530... The hinge point is the center of rotation and swings in the opposite direction; the other end of the first connector 520 is hinged to the first connecting part 531; one end of the third connector 540 is hinged to the second connecting part 532, and the other end of the third connector 540 is connected to the second sliding structure 310; one end of the fourth connector 550 is connected to the second connector 530, and the other end of the fourth connector 550 is connected to the first sliding structure 220. The fourth connector 550 is used to have the same movement trend as the first connector 520 and to have the opposite movement trend to the third connector 540. The second connector 530 is a rigid swing arm structure, hinged to a preset position on the frame 100, and can rotate and swing around the hinge. The first connector 520, the third connector 540 and the fourth connector 550 are all vertical rods. The first connector 520 moves downward with the pull of the second drive structure 510, thereby driving the second connector 530 to rotate around the hinge. Then the third connector 540 moves upward and drives the second probe 324 to move closer to the cell 400. At the same time, the fourth connector 550 moves downward and drives the first probe 211 to move closer to the cell 400, finally realizing the positive and negative electrical connection of the cell.

[0049] Furthermore, the second connecting member 530 has a structure with two connecting plates at each end of a hinge shaft. The hinge shaft passes through the frame 100. One connecting plate has a hole at one end, which is coaxially connected to the hinge shaft via a key. The other end of the connecting plate has a first connecting portion 531. The first connecting member 520 is hinged to the second connecting member 530 through the first connecting portion 531. The other connecting plate has three holes. One hole is coaxially connected to the hinge shaft via a key. The other two holes are located at both ends of the other connecting plate, namely the second connecting portion 532 and the third connecting portion 533. The third connecting member 540 is hinged to the second connecting member 530 through the second connecting portion 532, and the fourth connecting member 550 is hinged to the second connecting member 530 through the third connecting portion 533. Taking the vertical plane where the hinge shaft is located as the dividing line, the first connecting portion 531 and the third connecting portion 533 are on the same side, while the first connecting portion 531 and the second connecting portion 532 are on opposite sides.

[0050] The first connecting part 531, the second connecting part 532 and the third connecting part 533 are all through holes, and are hinged to each connecting part by means of bolts and nuts.

[0051] Specifically, the connection between the second drive structure 510, the first connector 520, the second connector 530, the third connector 540, and the fourth connector 550 is all hinged, ensuring that the first connector 520, the third connector 540, and the fourth connector 550 can all move in the vertical direction.

[0052] Through a synchronous transmission mechanism composed of multiple rigid links, the power output from the single second drive structure 510 is converted into the relative movement of the first and second probe assemblies. The first connecting part 531 and the second connecting part 532 of the second connecting member 530 are arranged eccentrically in opposite directions, which can realize the reverse transmission of power and ensure that the movement trends of the third connecting member 540 and the fourth connecting member 550 are opposite, thereby stably realizing the relative movement of the dual probe assemblies. The transmission logic is clear, the power transmission efficiency is high, and there is no power loss.

[0053] In some embodiments, the second drive structure 510 includes a cam 511, a rocker arm 512, a drive motor, and an elastic element 514; one end of the rocker arm is hinged to the frame 100, and the other end is a movable end; the cam 511 is connected to the drive motor, and the outer edge of the cam 511 abuts against one side of the rocker arm; one end of the elastic element 514 is connected to the frame 100, and the other end is connected to the movable end of the rocker arm 512; wherein, the cam 511 and the elastic element 514 are respectively used to cause the movable end of the rocker arm 512 to move in opposite directions around its hinge point. The cam 511 is connected to the output end 513 of the drive motor, and the rotation of the output end 513 of the drive motor drives the cam 511 to rotate. The cam 511 is an eccentric cam structure. The cam 511 and the elastic element 514 can be disposed on the same side or opposite side of the swing arm 512. When the cam 511 is disposed on the lower side of the swing arm 512 and swings the swing arm 512 by pushing, the elastic element 514 is disposed on the same side and provides pulling force or disposed on the opposite side and provides pushing force. When the cam 511 is disposed on the upper side of the swing arm 512 and swings the swing arm 512 by pressing, the elastic element 514 is disposed on the same side and provides pulling force or disposed on the opposite side and provides pushing force. The second drive structure 510 converts the rotational motion of the drive motor into the reciprocating swing of the swing arm 512. The power transmission method is simple and the transmission efficiency is high. Moreover, by controlling the speed and angle of the drive motor, the swing angle and swing speed of the swing arm 512 can be precisely controlled, thereby precisely controlling the travel and speed of the probe assembly and improving the accuracy of detection and positioning.

[0054] The elastic element 514 can be a spring, or an elastic rope when the elastic element 514 provides tension.

[0055] Specifically, cam 511 and elastic element 514 are located on the same side of swing arm 512. Cam 511 is used to push swing arm 512, and elastic element 514 is used to pull swing arm 512. Cam 511 and elastic element 514 are both located on the upper side of swing arm 512. One end of elastic element 514 is connected to the movable end of swing arm 512, and the other end is connected to the second fixed seat 120 on frame 100. Cam 511 is used to push swing arm 512 downward, and elastic element 514 is used to pull swing arm 512 upward. This simplifies the spatial layout of the second drive structure 510 and ensures the stability and smoothness of swing arm 512.

[0056] Specifically, a horizontal rod is provided on one side of the rocker arm 512, and the outer peripheral surface of the cam 511 is in contact with the horizontal rod of the rocker arm 512. The rocker arm 512 is driven to swing by the cooperation of the cam 511 and the horizontal rod. This makes it easier to design the outer profile of the cam 511 so as to design the sliding stroke.

[0057] In some other embodiments, the second driving structure can be a lead screw structure, with a drive motor driving the lead screw to rotate. The lead screw has two sections of threads in opposite directions, and the two sections of threads of the lead screw are respectively threaded into the first probe assembly 200 and the second probe assembly 300, so that when the lead screw rotates in one direction, it can simultaneously drive the first probe assembly 200 and the second probe assembly 300 to move closer or further away from each other.

[0058] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A cell short-circuit detection mechanism, characterized in that, include: frame; A first probe assembly is disposed on the frame and used to be disposed above the battery cell. The first probe assembly includes a pad and a first probe. The first probe and the pad are used to clamp the tab of the positive electrode of the battery cell. The first probe and the pad respectively contact the opposite sides of the tab to form an electrical connection. At least a portion of the first probe assembly is used to abut the end face of the positive electrode of the battery cell. The second probe assembly is disposed on the frame and located below the first probe assembly. The second probe assembly includes a second probe for forming an electrical connection with the negative terminal of the battery cell. A drive assembly is disposed on the frame and is drively connected to at least one of the first probe assembly and the second probe assembly. The drive assembly is used to drive the corresponding probe assembly to move vertically toward the cell. The driven probe assembly includes a flexible structure that absorbs the continued driving stroke of the driving assembly after the driven probe assembly contacts the battery cell.

2. The cell short-circuit detection mechanism according to claim 1, characterized in that: The first probe assembly includes a stop structure, the lower end face of which is used to abut the end face of the positive electrode of the battery cell at a preset height.

3. The cell short-circuit detection mechanism according to claim 2, characterized in that: The first probe assembly includes a clamping structure, which includes the pad and the first probe; the clamping structure further includes a first driving structure, which is used to drive the first probe and the pad to move relatively far apart in the horizontal direction to form a space for clamping the tab, and to move relatively close together to clamp the tab; the distance between the abutting surface of the stop structure and the lower end surface of the first probe is less than the extension length of the tab.

4. The cell short-circuit detection mechanism according to claim 2, characterized in that: The driving component is drively connected to the first probe component; the first probe component includes a first sliding structure and a first flexible structure, the first sliding structure is disposed on the frame, and the driving component is connected to the first sliding structure; the first flexible structure includes a first connecting plate, a first connecting rod, and a first spring, the first connecting plate is connected to the first sliding structure and can slide relative to the frame in the vertical direction; the first connecting plate has a first through hole, one end of the first connecting rod is connected to the stop structure, the other end passes through the first through hole and is provided with a first limiting structure, the first spring is sleeved on the first connecting rod and disposed between the stop structure and the first connecting plate, and the first limiting structure is used to restrict the first connecting rod from disengaging from the first through hole.

5. The cell short-circuit detection mechanism according to claim 4, characterized in that: The driving component is connected to the second probe component in a transmission manner; the second probe component includes a second sliding structure and a second flexible structure, the second sliding structure is disposed on the frame, and the driving component is connected to the second sliding structure; the second flexible structure includes a second connecting plate, a second connecting rod, and a second spring, the second connecting plate is connected to the second sliding structure and can slide relative to the frame in the vertical direction; the second connecting plate has a second through hole, one end of the second connecting rod is provided with the second probe, the other end of the second connecting rod passes through the second through hole and is provided with a second limiting structure, the second spring is sleeved on the second connecting rod and disposed between the second probe and the second connecting plate, and the second limiting structure is used to restrict the second connecting rod from disengaging from the second through hole.

6. The cell short-circuit detection mechanism according to claim 5, characterized in that: The driving component can simultaneously drive the first probe component and the second probe component to move relative to each other in the vertical direction. The first probe is used to approach the positive end of the battery cell, and the second probe is used to approach the negative end of the battery cell.

7. The cell short-circuit detection mechanism according to claim 6, characterized in that: The drive assembly includes a second drive structure, a first connector, a second connector, a third connector, and a fourth connector; One end of the first connector is connected to the second drive structure; The second connector is hinged to the frame. The second connector has a first connecting part and a second connecting part. The projections of the first connecting part and the second connecting part onto the plane where the hinge of the second connector is located can swing in opposite directions with the hinge of the second connector as the center of rotation. The other end of the first connector is hinged to the first connecting part; One end of the third connector is hinged to the second connector, and the other end of the third connector is connected to the second sliding structure; One end of the fourth connector is connected to the second connector, and the other end of the fourth connector is connected to the first sliding structure. The fourth connector is used to have the same movement trend as the first connector and to have the opposite movement trend to the third connector.

8. The cell short-circuit detection mechanism according to claim 7, characterized in that: The second drive structure includes a cam, a swing arm, a drive motor, and an elastic element; one end of the swing arm is hinged to the frame, and the other end is a movable end; the cam is connected to the drive motor, and the outer edge of the cam abuts against one side of the swing arm; One end of the elastic element is connected to the frame, and the other end is connected to the movable end of the swing arm; wherein the cam and the elastic element are respectively used to make the movable end of the swing arm move in opposite directions around its hinge.

9. The cell short-circuit detection mechanism according to claim 5, characterized in that: The first sliding structure includes a first linear slide rail disposed on the frame and arranged in a vertical direction, and the first connecting plate is slidably engaged with the first linear slide rail; the second sliding structure includes a second linear slide rail disposed on the frame and arranged in a vertical direction, and the second connecting plate is slidably engaged with the second linear slide rail.

10. The cell short-circuit detection mechanism according to claim 9, characterized in that: The first sliding structure further includes a first sliding plate and a second sliding plate. The first sliding plate and the first linear slide rail are slidably engaged. The first sliding plate and the second sliding plate are detachably connected. The second sliding plate is connected to the first connecting plate. One of the first sliding plate and the second sliding plate is provided with a scale, and the other is provided with a pointer.

Images