Battery shell detection device

Abstract

The utility model discloses a battery shell detection device, which comprises a clamping seat and a clamping mechanism, and is characterized in that the clamping seat is provided with a clamping position, and the clamping position is used for fixing a to-be-detected shell; the clamping mechanism comprises a first clamping assembly and a second clamping assembly, the first clamping assembly comprises two first clamping pieces, the two first clamping pieces are arranged in a spaced mode in the first direction, and the two first clamping pieces can get close to each other or get away from each other and are used for clamping the two large faces of the shell to be detected when getting close to each other; the second clamping assembly comprises two second clamping pieces, the two second clamping pieces are arranged in the second direction in a spaced mode, and the two second clamping pieces can get close to each other or get away from each other and are used for clamping the two side faces of the shell to be detected when getting close to each other. The side surface of the to-be-tested shell is clamped by the clamping mechanism, so that the problem that the side surface of the shell cracks in advance or is excessively expanded when the to-be-tested shell is subjected to the charging and discharging simulation charge-discharge cycle process is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery production, in particular to a battery shell detection device. BACKGROUND

[0002] In the field of battery manufacturing, the shell and cover plate of the battery are usually spliced by welding, and after welding is completed, the design parameters such as the penetration and width of the weld at the welding position are inspected to determine whether the welding quality meets the standard. However, the battery will swell to a certain extent during actual charge and discharge cycles, resulting in a bulging state of the convex surface of the battery. This bulging exerts a continuous force on the weld between the cover plate and the shell, and since there is a lack of effective evaluation means for the force bearing capacity of the weld under this working condition, it is difficult to intuitively present the bearing capacity of the welding position of the battery cover plate and the shell.

[0003] Therefore, the air-filled fatigue test emerges as the times require, aiming to test the reliability of the welding position by simulating the actual working condition, so as to correct whether the battery meets the structure simulation requirement. The existing air-filled fatigue test device restores the actual stress condition of the battery and the swelling condition of the battery during the charge and discharge process. However, during the specific test process, the battery side frequently appears over-swelling and pre-cracking, which does not conform to the actual situation of the battery in actual use and cannot truly reflect the performance of the product under actual working conditions. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome at least one of the defects of the prior art described above, the application provides a battery shell detection device, which clamps the side of the to-be-tested shell through a clamping mechanism, thereby avoiding the problem of pre-cracking or over-swelling of the side of the to-be-tested shell during actual working condition simulation such as charge and discharge cycles.

[0005] The technical scheme adopted by the application to solve the problems is as follows:

[0006] A battery shell detection device, comprising,

[0007] A clamping seat is provided with a clamping position for fixing a to-be-tested shell.

[0008] A clamping mechanism includes a first clamping component and a second clamping component. The first clamping component includes two first clamping pieces, which are arranged at intervals in a first direction and can approach or move away from each other, and are used to clamp two large surfaces of the to-be-tested shell when approaching each other. The second clamping component includes two second clamping pieces, which are arranged at intervals in a second direction and can approach or move away from each other, and are used to clamp two sides of the to-be-tested shell when approaching each other.

[0009] As a preferred technical scheme of the present application, the second clamping assembly further comprises a mounting plate and an adjusting member, the mounting plate is mounted on the clamping seat, and the adjusting member is movably connected to the mounting plate; the second clamping member is connected to one end of the adjusting member; the adjusting member is used to drive the second clamping member to move towards or away from the to-be-tested shell in the second direction during movement.

[0010] As a preferred technical scheme of the present application, the adjusting member comprises a screw rod, a threaded hole is arranged on the mounting plate, and the screw rod is screwed with the threaded hole; the second clamping member is connected to an end of the screw rod.

[0011] As a preferred technical scheme of the present application, the second clamping assembly further comprises a guide member, and the guide member is used to guide the second clamping member to stably move in the second direction.

[0012] As a preferred technical scheme of the present application, the guide member comprises a linear bearing and a guide rod, the linear bearing is arranged on the mounting plate, and the guide rod is connected to the linear bearing; an end of the guide rod is connected to the second clamping member.

[0013] As a preferred technical scheme of the present application, the second clamping member comprises a clamping block, the clamping block has a clamping surface, and a buffer member is arranged on the clamping surface.

[0014] As a preferred technical scheme of the present application, the clamping block comprises a pressing section and a connecting section, the clamping surface is formed on one side of the pressing section, the connecting section is connected to the other side of the pressing section, a avoiding groove is arranged on the top of the connecting section, and a weight-reducing groove is arranged on the connecting section.

[0015] As a preferred technical scheme of the present application, a gas charging and discharging assembly is arranged, the gas charging and discharging assembly comprises a gas guide pipe and a gas charging and discharging generator, one end of the gas guide pipe is connected to the gas charging and discharging generator, the other end of the gas guide pipe is used to communicate with a cavity of the to-be-tested shell, and the gas charging and discharging generator is used to charge or discharge gas into the cavity through the gas guide pipe.

[0016] As a preferred technical scheme of the present application, a detection member is arranged, the detection member has a detection surface, and the detection surface is used to detect the expansion degree of the large face of the to-be-tested shell.

[0017] As a preferred technical scheme of the present application, the first clamping member comprises a clamping plate, the first clamping assembly further comprises a connecting plate, the connecting plate is arranged on the side of the clamping plate away from the clamping position, an installation interval is formed between the connecting plate and the clamping plate, and the detection member is installed in the installation interval; the side surface of the detection member towards the clamping plate is formed as the detection surface.

[0018] In summary, the battery shell detection device provided by the application has the following technical effects:

[0019] The first clamping assembly of the application clamps the two large faces of the battery, which can simulate the constraint environment of the large faces under actual working conditions and provide basic conditions for accurate detection. Meanwhile, the second clamping assembly of the application clamps the two side faces of the shell to be detected, which can effectively limit the deformation of the side faces of the shell during the detection process, so that the stress state is closer to the real situation of the battery in actual use, and the detection result is prevented from being incorrect due to premature failure of the side faces, thereby ensuring that the test can truly reflect the reliability of the shell and the cover plate welding place and the entire structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the battery shell detection device of the embodiment of the application;

[0021] Figure 2 FIG. 2 is a schematic diagram of the structure of the battery shell detection device of the embodiment of the application after the clamping seat is hidden;

[0022] Figure 3 FIG. 3 is a schematic diagram of the structure of the battery shell detection device of the embodiment of the application when the clamping seat fixes the shell to be detected;

[0023] Figure 4 FIG. 4 is a schematic diagram of the structure of the battery shell detection device of the embodiment of the application when the second clamping assembly clamps the shell to be detected;

[0024] Figure 5 FIG. 5 is a partial structural schematic diagram of the second clamping assembly of the embodiment of the application;

[0025] Figure 6 FIG. 6 is a schematic diagram of the cross-sectional view of the battery shell detection device of the embodiment of the application along the first direction;

[0026] Figure 7 FIG. 7 is a schematic diagram of the structure of the detection piece of the embodiment of the application.

[0027] Among them, the meaning of the reference signs is as follows:

[0028] 10, clamping seat; 11, clamping site; 12, base; 122, mounting groove; 121, support screw; 13, pressing plate; 131, measuring hole; 14, mounting table; 20, to-be-measured shell; 201, buffer foam; 30, clamping mechanism; 31, first clamping piece; 32, second clamping piece; 321, clamping surface; 322, pressing section; 323, connecting section; 324, avoiding groove; 325, weight-reducing groove; 33, mounting plate; 331, threaded hole; 332, fastener; 34, screw; 35, guide piece; 351, linear bearing; 352, guide rod; 36, connecting plate; 37, fixed plate; 38, connecting screw; 39, pressing screw; 391, pressure plate; 40, detection piece. DETAILED DESCRIPTION

[0029] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0031] 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 in the specification of the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application.

[0032] Referring to Figure 1 , the present application discloses a battery shell detection device, which comprises a clamping seat 10 and a clamping mechanism 30. Specifically, referring to Figure 3 , the clamping seat 10 is provided with a clamping site 11, and the clamping site 11 is used to fix a to-be-measured shell 20; referring to Figure 2 , the clamping mechanism 30 comprises a first clamping assembly and a second clamping assembly, wherein the first clamping assembly comprises two first clamping pieces 31, the two first clamping pieces 31 are arranged at intervals in a first direction, the two first clamping pieces 31 can approach or move away from each other, and are used to clamp two large faces of the to-be-measured shell 20 when approaching each other. In addition, referring to Figure 4 , the second clamping assembly comprises two second clamping pieces 32, the two second clamping pieces 32 are arranged at intervals in a second direction, the two second clamping pieces 32 can approach or move away from each other, and are used to clamp two side faces of the to-be-measured shell 20 when approaching each other.

[0033] On the basis of the structure, when the battery shell detection device of the application is used, the shell to be detected 20 is first placed on the clamping position 11 of the clamping seat 10 to fix the shell to be detected 20. Then the first clamping assembly is adjusted so that the two first clamping pieces 31 arranged in the first direction begin to approach each other and gradually tightly fit on the two large faces of the shell to be detected 20. Then the second clamping assembly is adjusted so that the two second clamping pieces 32 in the second direction move towards each other and clamp the two side faces of the shell to be detected 20.

[0034] When the clamping mechanism 30 completes the clamping of the large faces and the side faces of the shell, the detection device can work cooperatively with other detection equipment, for example, connecting the air inflation fatigue resistance experiment equipment, inflating the shell, simulating the pressure generated by the cell expansion on the shell and the welding seam, and observing the performance of the welding position and the whole shell. During the whole detection process, the clamping mechanism 30 keeps the stable constraint on the shell to ensure the accuracy and reliability of the detection data.

[0035] It should be noted that the first clamping assembly simulates the stress condition of the battery shell in actual use, specifically: the clamping seat 10 acts as a support frame in the battery pack or the battery module, when the shell to be detected 20 is placed on the clamping seat 10, the two first clamping pieces 31 act as the two side end plates of the shell to be detected 20, so that the stress state of the shell to be detected 20 is similar to that in the real battery pack or battery module, and the stress state of the battery in actual use is simulated.

[0036] Because the battery will swell due to the cell expansion in the charge and discharge cycle, and the two large faces of the battery are clamped by the first clamping assembly, the constraint environment of the large face in the actual working condition is simulated to provide a basic condition for accurate detection. At the same time, the two side faces of the shell to be detected 20 are clamped by the second clamping assembly, which can effectively limit the deformation of the side face of the shell during the detection process.

[0037] Specifically, for example, when the cavity of the shell to be detected 20 is inflated and deflated to simulate the charge and discharge cycle process, the clamping of the second clamping assembly to the shell to be detected 20 can avoid the problem of excessive expansion and early cracking of the side face of the shell, so that the stress state is closer to the real situation of the battery in actual use, and the detection result is avoided due to the premature failure of the side face, so as to ensure that the test can truly reflect the reliability of the shell and the cover plate welding position and the whole structure.

[0038] In addition, referring to Figure 3The clamping seat 10 specifically comprises a base 12 and a pressing plate 13, and the clamping position 11 is arranged on the base 12. Specifically, the clamping position 11 is provided with a mounting table 14, the mounting table 14 is provided with a limiting groove, the bottom of the to-be-tested shell 20 is mounted in the limiting groove, and the pressing plate 13 is used for pressing the top of the to-be-tested shell 20 after the bottom of the to-be-tested shell 20 is mounted in the limiting groove. The base 12 and the pressing plate 13 are connected through a supporting screw 121, and the height between the base 12 and the pressing plate 13 can be adjusted by rotating the supporting screw 121 according to different specifications of the to-be-tested shell 20, so that the to-be-tested shell 20 is fixed on the clamping position 11 by the base 12 and the pressing plate 13, and the upper and lower end faces of the to-be-tested shell 20 are not excessively pressed.

[0039] In this way, the to-be-tested shell 20 is fixed by the clamping seat 10, so that the detection accuracy is prevented from being affected by shaking and displacement in the subsequent detection process, and the shell is ensured to be in a predetermined position under the simulation working conditions such as inflation and pressure application, so that the stress and strain data of the shell at all positions can be accurately captured by the detection equipment.

[0040] Therefore, by the battery shell detection device, the stress environment of the battery in actual use can be restored, so that the stress condition and dynamic stress change of the battery shell can be more accurately reflected when the battery shell is simulated under actual working conditions.

[0041] As a preferred technical solution of the present application, referring to Figure 4 and Figure 5 The second clamping assembly further comprises a mounting plate 33 and an adjusting piece, specifically, the mounting plate 33 is mounted on the clamping seat 10, and the adjusting piece is movably connected to the mounting plate 33. The second clamping piece 32 is connected to one end of the adjusting piece, and the adjusting piece is used to drive the second clamping piece 32 to approach or move away from the to-be-tested shell 20 in the second direction during movement.

[0042] On the basis of this structure, during assembly, the two mounting plates 33 can be arranged opposite to each other in the second direction and fixedly mounted on the clamping seat 10 through fasteners 332 such as screws and bolts, then the adjusting piece is mounted on the mounting plate 33, and the second clamping piece 32 is connected to one end of the adjusting piece.

[0043] Before the to-be-tested shell 20 is placed, the adjusting piece can be preliminarily adjusted according to the specifications and models of the to-be-tested shell 20. Since the side dimensions of the battery shell of different batches and models may be different, the adjusting piece is operated to preliminarily move the second clamping piece 32 to a generally appropriate position, so as to reserve appropriate space for subsequent clamping of the shell side. Then the to-be-tested shell 20 is placed on the clamping position 11 of the clamping seat 10, and the adjusting piece is driven by a manual or automatic control system to drive the second clamping piece 32 to approach the side of the to-be-tested shell 20 in the second direction.

[0044] Thus, the two second clamping pieces 32 can be driven by the adjusting piece to clamp the side of the to-be-tested shell 20 in the second direction at a uniform, stable speed and force, avoiding uneven stress on the shell due to unilateral clamping too fast or too tight, and causing abnormal deformation of the side.

[0045] In addition, as the detection conditions change, for example, when simulating the charging and discharging conditions, the stress state of the side of the battery shell will dynamically change due to internal pressure changes, temperature fluctuations, and other factors. At this time, the real-time monitored data feedback (such as the shell side stress and strain information obtained through a strain measuring instrument, a pressure sensor, etc.) can be used to quickly and accurately drive the second clamping piece 32 to fine-tune the position or clamping force through the adjusting piece, so as to adapt to the changing mechanical environment of the shell side in real time, ensuring that the shell side is always in a reasonable constraint state under various complex conditions, neither over-expanding, cracking, or other failure phenomena due to loose clamping, nor introducing additional stress concentration due to tight clamping, which interferes with the accuracy of the detection results.

[0046] As a preferred technical solution of the present application, the adjusting piece includes a screw rod 34, and a threaded hole 331 is provided on the mounting plate 33 corresponding to the screw rod 34, and the screw rod 34 is screwed with the threaded hole 331. The second clamping piece 32 is connected to the end of the screw rod 34.

[0047] Thus, the screw rod 34 can be rotated manually or by a motor, and the screw rod 34 will move smoothly along the axial direction of the threaded hole 331 by using the screw transmission principle, thereby driving the second clamping piece 32 to approach or move away from the side of the to-be-tested shell 20.

[0048] In addition, the adjusting piece can also be a driving cylinder, which can be a liquid cylinder or an air cylinder. The cylinder barrel is fixed on the mounting plate 33, and the second clamping piece 32 is connected through a telescopic rod. When compressed air or compressed liquid enters from one end of the cylinder barrel, it pushes the telescopic rod to slide along the inner wall of the cylinder barrel, driving the second clamping piece 32 to move.

[0049] As a preferred technical solution of the present application, the second clamping assembly further includes a guide piece 35, and the guide piece 35 is used to guide the stable movement of the second clamping piece 32 in the second direction.

[0050] On the basis of this structure, during assembly, the guide piece 35 is positioned and firmly installed on the mounting plate 33 according to the predetermined movement trajectory of the second clamping piece 32 in the second direction. Then the second clamping piece 32 is moved closer to or away from the to-be-tested shell 20 by the adjusting piece, and in this process, the guide piece 35 guides the movement of the second clamping piece 32.

[0051] Specifically, the guide 35 can be a guide channel or a guide rail structure, which effectively avoids unstable movement of the second clamping member 32 caused by manual operation deviation, screw thread gap or other external factors by constraining the second clamping member 32 to move smoothly along the second direction.

[0052] As a preferred technical solution of the present application, the guide 35 comprises a linear bearing 351 and a guide rod 352. Specifically, the linear bearing 351 is arranged on the mounting plate 33, and the guide rod 352 is connected to the linear bearing 351. The end of the guide rod 352 is connected to the second clamping member 32.

[0053] On the basis of this structure, the mounting plate 33 is provided with a mounting hole, and the linear bearing 351 is installed in the mounting hole in an interference fit. The linear bearing 351 is used in cooperation with the guide rod 352 to achieve high-precision, low-friction and stable linear motion.

[0054] In this way, the cooperation of the linear bearing 351 and the guide rod 352 enables the guide 35 to guide the second clamping member 32 to move stably along the second direction to approach or move away from the to-be-tested shell 20.

[0055] As a preferred technical solution of the present application, the second clamping member 32 comprises a clamping block, and the clamping block has a clamping surface 321. The clamping surface 321 is provided with a buffer.

[0056] On the basis of this structure, when it is necessary to clamp the side surface of the to-be-tested shell 20, the clamping block can be driven by the adjusting member to approach the to-be-tested shell 20. In this process, the buffer moves together with the clamping block until it is tightly attached to the side surface of the to-be-tested shell 20.

[0057] The buffer can be a foam pad, a silica gel pad or the like, which can be attached or embedded on the clamping surface 321 and protrude from the clamping surface 321. It should be noted that the buffer is tightly attached to the side surface of the to-be-tested shell 20 in the initial state, and at this time the buffer is not compressed. When the side surface of the to-be-tested shell 20 expands, it first compresses the buffer, and the buffer begins to elastically deform to absorb and buffer the expansion force. That is, the buffer allows the side surface of the to-be-tested shell 20 to have a certain amount of expansion, so that the to-be-tested shell 20 is more consistent with the actual stress condition.

[0058] In addition, the buffer can uniformly disperse the clamping force applied by the clamping block to the surface of the object, avoiding the situation that the local pressure is too large, and preventing the object from deforming, breaking or the like due to excessive local stress, thereby ensuring the integrity and performance of the object during clamping.

[0059] As a preferred technical solution of the present application, the clamping block comprises a pressing section 322 and a connecting section 323, and the clamping surface 321 is formed on one side of the pressing section 322, and the connecting section 323 is connected to the other side of the pressing section 322. Wherein, the top of the connecting section 323 is provided with an avoiding groove 324, and the connecting section 323 is provided with a weight-reducing groove 325.

[0060] Wherein, the connecting section 323 is also connected with the guide 35 and the end of the adjusting member, and in use, the adjusting member can be adjusted to drive the pressing section 322 to move under the guidance of the guide 35.

[0061] In addition, the avoiding groove 324 provided on the top of the connecting section 323 can avoid the connection structure in the first direction, so as to prevent the movement of the second clamping member 32 from being interfered. Wherein, the weight-reducing groove 325 can reduce the weight of the clamping block, so as to make the movement of the clamping block more stable.

[0062] As a preferred technical solution of the present application, the charging and discharging assembly is provided, specifically, the charging and discharging assembly comprises a gas guide pipe and a charging and discharging generating member, one end of the gas guide pipe is connected with the charging and discharging generating member, and the other end of the gas guide pipe is used for communicating with the cavity of the to-be-tested shell 20. Wherein, the charging and discharging generating member is used for charging or discharging the cavity via the gas guide pipe.

[0063] On the basis of the above structure, when simulating the charging and discharging working condition of the to-be-tested shell 20, a plurality of to-be-tested shells 20 can be divided into a plurality of to-be-tested groups, under the same test temperature, using the charging and discharging generating member which can be repeatedly charged and discharged, the cavities of different groups of to-be-tested shells 20 are inflated according to different constant pressures, after the inflation is completed, the expansion amount of the large surface of the to-be-tested shell 20 is measured, and the expansion amount of the large surface of the to-be-tested shell 20 corresponding to different pressures is recorded; wherein, considering the actual use condition and safety requirement of the battery shell, the value range of the pressure is 0.1-0.45MPa.

[0064] Therefore, the charging and discharging assembly can simulate the gas pressure condition of the shell in actual work by charging different pressure gas into the cavity of the to-be-tested shell 20, so as to test the performance of the shell, such as whether the structural strength and sealing property of the shell meet the requirements under high pressure or low pressure environment.

[0065] It should be noted that the to-be-tested shell 20 includes a main shell and a cover plate, the cover plate is arranged at one end of the main shell and is welded with the main shell by a welding process to form the to-be-tested shell 20. The welding seam at the connection between the cover plate and the main shell is located at the end of the large face and the side face of the to-be-tested shell 20, and the welding seam is a weak part in the shell structure. When the middle part of the large face of the to-be-tested shell 20 expands in the charge-discharge cycle process, the welding seam is easily subjected to the pulling action of the expansion of the large face of the shell, and long-term stress action can cause the welding seam to crack, thereby affecting the sealing performance and overall strength of the shell.

[0066] Therefore, the application simulates the expansion state of the to-be-tested shell 20 in the charge-discharge cycle process by charging and discharging the cavity, thereby testing the fatigue resistance of the welding seam position, and evaluating the performance of the welding seam under different stress conditions by evaluating the expansion degree of the to-be-tested shell 20 under different charge-discharge cycle conditions.

[0067] In addition, referring to Figure 1 , the pressing plate 13 is provided with a measuring hole 131, after the charging and discharging device charges or discharges the cavity of the to-be-tested shell 20, a measuring tool such as a vernier caliper or a scale can be used, for example, the measuring end of the vernier caliper is inserted through the measuring hole 131 to contact the two large faces of the to-be-tested shell, thereby measuring the expansion amount of the to-be-tested shell 20 during the test, at this time, the pressing plate 13 does not need to be disassembled, thereby improving the test efficiency.

[0068] In addition, the charging and discharging device can be a gas pump, a gas tightness device, etc. The cover plate is provided with a connecting port, and the air guide pipe is inserted into the cavity through the connecting port, and the air guide pipe and the connecting port are sealed and fixed by structural glue.

[0069] As a preferred technical solution of the application, referring to Figure 6 and Figure 7 , the battery shell detection device further includes a detection piece 40, the detection piece 40 has a detection surface, and the detection surface is used to detect the expansion degree of the large face of the to-be-tested shell 20.

[0070] On the basis of this structure, the detection surface of the detection piece 40 can be attached to the large face of the to-be-tested shell 20 or to the first clamping piece 31. In this way, when the to-be-tested shell 20 is charged and discharged to simulate the charge-discharge cycle, the large face of the to-be-tested shell 20 expands, and the expansion degree can be represented by the change in the distance between the two large faces of the to-be-tested shell 20, and the reaction force on the first clamping piece 31 when the first clamping piece 31 clamps the to-be-tested shell 20.

[0071] Specifically, the detection piece 40 can be a pressure sensor, a strain pressure sensor, etc. By adhering the detection surface of the pressure sensor to the large surface of the to-be-tested shell 20, the detection surface can directly measure the overall expansion force or the local expansion force of the large surface of the shell and convert it into an electrical signal to be transmitted to the system.

[0072] In addition, the expansion degree of the to-be-tested shell 20 measured by the detection piece 40 can also be combined with the large surface expansion amount measured by the measuring tool to jointly evaluate the stress condition of the weld.

[0073] As a preferred technical solution of the present application, the first clamping piece 31 includes a clamping plate, and the first clamping assembly further includes a connecting plate 36, and the connecting plate 36 is arranged on the side of the clamping plate away from the clamping position 11. The connecting plate 36 is spaced apart from the clamping plate to form a mounting interval, and the detection piece 40 is mounted in the mounting interval. In addition, the side of the detection piece 40 facing the clamping plate is formed as the detection surface.

[0074] On the basis of this structure, when the first clamping assembly is used, the two clamping plates can be moved towards each other and adhered to the two large surfaces of the to-be-tested shell 20, and then the detection piece 40 is mounted in the mounting interval, and then the connecting plate 36 is moved close to the clamping plate to make the connecting plate 36 and the clamping plate jointly clamp the detection piece 40.

[0075] At this time, since the two large surfaces of the to-be-tested shell 20 are clamped by the clamping plate, when the to-be-tested shell 20 expands after being inflated, the expansion degree of the to-be-tested shell 20 is transmitted to the detection surface adhered to the clamping plate through the clamping plate, so that the detection piece 40 can detect the local stress or overall stress condition of the large surface of the shell.

[0076] The width between the two clamping plates can be adjusted, and the first clamping assembly can adapt to to-be-tested shells 20 of different sizes, thereby improving the flexibility and applicability of the test. The detection piece 40 can accurately receive and record the expansion degree data from the shell, providing a reliable basis for evaluating the performance of the shell. In addition, the side of the clamping plate facing the to-be-tested shell 20 is also provided with a buffer foam 201, which can uniformly transmit the expansion degree of the large surface of the to-be-tested shell 20 to the detection surface.

[0077] In addition, the first clamping assembly further includes a fixing plate 37, as shown in Figure 3 The base 12 is provided with a mounting groove 122, and the bottom end of the fixing plate 37 is fixedly installed in the mounting groove 122. As shown in Figure 2 and Figure 6The two clamping plates, the connecting plate 36 and the fixing plate 37 are sequentially arranged in the first direction, four corners of the fixing plate 37 are provided with a connecting screw rod 38, specifically, the four connecting screw rods 38 are sequentially provided in the fixing plate 37, the connecting plate 36 and the two clamping plates, and the two ends of the connecting screw rod 38 are fixedly connected with the clamping plate and the fixing plate 37 on the outside, and the other clamping plate and the connecting plate 36 are movably connected with the connecting screw rod 38.

[0078] The middle part of the fixing plate 37 is further provided with a threaded mounting hole, a pressing screw rod 39 is screwed in the threaded mounting hole, the end of the pressing screw rod 39 is provided with a pressure plate 391, and the pressure plate 391 can be driven to approach or move away from the connecting plate 36 by rotating the pressing screw rod 39. In this way, when the pressure plate 391 approaches the connecting plate 36, the pressure plate 391 presses the connecting plate 36, so that the connecting plate 36 is clamped together with the clamping plate to clamp the detection piece 40. When the large surface of the to-be-tested shell 20 expands, the expansion force can be quickly transmitted to the detection piece 40 through the clamping plate, so that the detection piece 40 receives and detects the expansion force of the to-be-tested shell 20, and then analyzes the bearing capacity of the shell weld based on the data.

[0079] It should be noted that the battery shell detection device of the present application is used to simulate the charging and discharging cycle of the to-be-tested shell 20 for 5000 times, then the penetration and width of the weld are recorded again, and compared with the parameters recorded before detection, the damage degree of the weld under different pressure can be confirmed.

[0080] Therefore, the 5000 times of charging and discharging cycle simulates the long-term pressure change process of the battery in actual use, which helps to evaluate the durability and reliability of the shell and the weld under long-term pressure. Through multiple cycle tests, the fatigue strength of the shell and the damage degree of the weld can be more accurately evaluated. By comparing the changes of the weld parameters before and after the test, the damage degree of the weld under different pressure can be directly evaluated.

[0081] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, some improvements and refinements can be made, which are also considered within the protection scope of the present application.

Claims

1. A battery casing testing device, characterized in that, include, A clamping base, wherein the clamping base is provided with a clamping position, the clamping position being used to fix the housing to be tested; The clamping mechanism includes a first clamping assembly and a second clamping assembly. The first clamping assembly includes two first clamping members, which are spaced apart in a first direction. The two first clamping members can move closer to each other or further away from each other, and are used to clamp the two large surfaces of the housing to be tested when they are close together. The second clamping assembly includes two second clamping members, which are spaced apart in a second direction. The two second clamping members can move closer to each other or further away from each other, and are used to clamp the two sides of the housing to be tested when they are close together.

2. The battery casing testing device according to claim 1, characterized in that: The second clamping assembly further includes a mounting plate and an adjusting member. The mounting plate is mounted on the clamping base, and the adjusting member is movably connected to the mounting plate. The second clamping member is connected to one end of the adjusting member. The adjusting member is used to move the second clamping member closer to or further away from the housing to be tested along the second direction during the movement.

3. The battery casing testing device according to claim 2, characterized in that: The adjusting component includes a screw, and the mounting plate has a threaded hole, with the screw being screwed into the threaded hole; the second clamping component is connected to the end of the screw.

4. The battery casing testing device according to claim 2, characterized in that: The second clamping assembly further includes a guide for guiding the second clamping member to move stably in the second direction.

5. The battery casing testing device according to claim 4, characterized in that: The guide component includes a linear bearing and a guide rod. The linear bearing is disposed on the mounting plate, and the guide rod is connected to the linear bearing. The end of the guide rod is connected to the second clamping component.

6. The battery casing testing device according to any one of claims 1-5, characterized in that: The second clamping member includes a clamping block, the clamping block having a clamping surface, and a buffer member provided on the clamping surface.

7. The battery casing testing device according to claim 6, characterized in that: The clamping block includes a pressing section and a connecting section. The clamping surface is formed on one side of the pressing section, and the connecting section is connected to the other side of the pressing section. The top of the connecting section is provided with an avoidance groove, and the connecting section is provided with a weight reduction groove.

8. The battery casing testing device according to claim 1, characterized in that: The device includes an inflation / deflation assembly, which includes an air guide tube and an inflation / deflation generator. One end of the air guide tube is connected to the inflation / deflation generator, and the other end of the air guide tube is used to communicate with the cavity of the housing to be tested. The inflation / deflation generator is used to inflate or deflate the cavity through the air guide tube.

9. The battery casing testing device according to claim 8, characterized in that: It includes a detection element having a detection surface, which is used to detect the degree of expansion of the large surface of the shell to be tested.

10. The battery casing testing device according to claim 9, characterized in that: The first clamping member includes a clamping plate, and the first clamping assembly further includes a connecting plate. The connecting plate is disposed on the side of the clamping plate facing away from the clamping position. An installation interval is formed between the connecting plate and the clamping plate. The detection member is installed in the installation interval. The side of the detection member facing the clamping plate is formed as the detection surface.

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