Battery shell extrusion testing device

Abstract

The utility model discloses a battery shell extrusion testing device which comprises a base, a fixing frame, a telescopic rod and an expansion body, the fixing frame is arranged on the base, the telescopic rod is arranged on the fixing frame, the telescopic end of the telescopic rod faces the base, and the telescopic end is fixedly connected with the expansion body; a placing seat is arranged at the position, corresponding to the telescopic rod, of the base, the placing seat is used for clamping and placing a battery shell so that the battery shell can be located below the expansion body, an opening of the battery shell faces the expansion body, and when the expansion body descends in the direction of the base along with the telescopic end, the battery shell can be placed on the placing seat. The expansion body enters the battery shell; and the expansion body extrudes the battery shell outwards in the battery shell, so that the battery shell is deformed.

Description

Technical Field

[0001] This utility model belongs to the field of battery production technology, and specifically relates to a battery casing extrusion testing device. Background Technology

[0002] A casing compression testing device is used to detect the deformation capacity of a square battery casing. For example, patent application number 2017210198677 discloses an internal pressure testing device for a square aluminum-cased battery. This device includes a casing, a cover plate for sealing the casing, and a safety valve mounted on the casing. The cover plate has an injection hole. The pressure testing device includes a base, a positioning block for pressing against the cover plate, a clamping seat for holding the casing, and a power unit for driving the clamping seat to move. The positioning block is fixed to the base, and the power unit is adjustablely mounted on the base, pushing the clamping seat to clamp the casing between the clamping seat and the positioning block. During pressure testing of the casing sealed with the cover plate, the power unit pushes the clamping seat to clamp the casing between the clamping seat and the positioning block. Then, water is injected into the casing through the injection hole. When the internal water pressure rises and opens the safety valve, the peak pressure is recorded, thus achieving the battery pressure test. Since the casing is already sealed with the cover plate, there is no need to manufacture molds with bosses of various specifications to seal the casing, reducing costs and facilitating rapid switching when testing different battery models.

[0003] It can effectively detect weak points in the casing, but it cannot perform compression detection on a single location inside the casing, and cannot simulate the actual deformation of the casing caused by battery expansion. Utility Model Content

[0004] The purpose of this invention is to provide a battery casing compression testing device that can detect different positions of the casing, simulating the scenario of deformation at a single position when the battery cell expands, and the obtained test data is closer to the actual situation.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a battery casing compression testing device, including a base, a fixed frame, a telescopic rod, and an expansion body. The fixed frame is mounted on the base, and the telescopic rod is mounted on the fixed frame. The telescopic end of the telescopic rod faces the base and is fixedly connected to the expansion body. A placement seat is provided on the base corresponding to the position of the telescopic rod. The placement seat is used to clamp and place the battery casing, so that the battery casing is located below the expansion body, and the opening of the battery casing faces the expansion body. When the expansion body descends in the direction of the telescopic end toward the base, the expansion body enters the battery casing. The expansion body compresses the battery casing outward from inside the battery casing, causing it to deform.

[0006] Furthermore, the placement seat includes a clamping ring and a centrally empty receiving cavity. The clamping ring is equipped with multiple clamping components, which are distributed around the battery housing to clamp the battery housing within the receiving cavity.

[0007] Furthermore, the telescopic rod is mounted on the top center of the fixed frame, and the accommodating cavity is located directly below the telescopic rod; the fixed frame is equipped with a telescopic drive, which is used to drive the telescopic rod to extend and retract, so that the expansion body expands at different positions within the battery casing.

[0008] Furthermore, when the battery casing is a square casing, at least one clamping assembly is configured on each of the four side walls of the battery casing corresponding to the clamping rings; the clamping assembly includes a telescopic member and a clamping plate, the clamping plate is a flat plate structure, the telescopic member drives the clamping plate to abut against the square casing; multiple clamping plates jointly clamp the battery casing, and multiple telescopic members jointly adjust the clamping position of the battery casing.

[0009] Furthermore, when the battery casing is a circular casing, the multiple clamping components on the clamping ring are evenly distributed in a ring; the clamping components include a telescopic member and a clamping plate, the clamping plate has an arc-shaped structure, and the telescopic member drives the clamping plate to abut against the circular casing; the multiple clamping plates together clamp the battery casing.

[0010] Furthermore, it also includes a positioning component, which is disposed on the fixed frame. A positioning plate is provided on the outer wall of the telescopic rod. The positioning component is located on the outer wall side of the telescopic rod and docks with the positioning plate to lock the telescopic stroke of the telescopic rod, so that the position of the telescopic rod is fixed when the telescopic drive stops.

[0011] Furthermore, the telescopic rod has a built-in central cavity, the expansion body is a telescopic structure, and the telescopic structure is electrically connected to an external control console through the central cavity.

[0012] Furthermore, a booster pump is configured at the upper end of the central cavity, and the booster pump is electrically connected to an external control console. The expansion body has a built-in horizontally opposed compression chamber, the inner end of which is connected to the lower end of the central cavity. Piston structures are provided at both outer ends of the compression chamber, and extrusion blocks are provided on the outer sides of the piston structures. The booster pump pressurizes the compression chamber through the central cavity, causing the piston structures on both sides to move outward synchronously, and the extrusion blocks extrude pressure on the battery casing.

[0013] Furthermore, a reset element is provided between the extrusion block and the expansion body.

[0014] Furthermore, a heating groove is formed around the extrusion block on the side wall of the expansion body. An electric heating wire is laid at the bottom of the heating groove, and a hot melt adhesive strip is placed inside the heating groove. The electric heating wire is electrically connected to the control console. After the electric heating wire is energized, it heats the hot melt adhesive strip to melt it. After cooling and solidification, the expansion body can be bonded to the battery casing.

[0015] Furthermore, it also includes a detection frame, which is horizontally slidably connected to the fixing frame. The expansion body is located inside the detection frame, and the size of the detection frame is larger than the size of the accommodating cavity. The detection frame is equipped with multiple detection components, and all of the multiple detection components are electrically connected to an external control console.

[0016] Furthermore, the detection components include a transmitter and a receiver, which are stacked vertically within the detection frame. Multiple detection components are evenly distributed inside the detection frame to detect the battery casing inside and determine whether the deformed casing is damaged.

[0017] Furthermore, the upright of the fixed frame has a built-in guide rail, and a detection drive is provided on the top of the guide rail. The detection frame is provided with a slide table corresponding to the guide rail. The slide table is slidably disposed on the guide rail. The detection drive is connected to the slide table to drive the detection frame to rise and fall along the direction of the upright. The telescopic rod is parallel to the upright.

[0018] The beneficial effects of this utility model are as follows:

[0019] This utility model proposes a battery casing compression testing device that compresses the battery casing from the inside out to cause deformation. The deformation position can be adjusted according to the testing requirements, and the expansion body can be placed at different depths inside the casing. This can effectively simulate the actual situation when the battery expands, and by testing the casing, more realistic test data can be obtained. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0021] Figure 1 This is a structural diagram of a battery casing compression testing device according to an embodiment of the present invention;

[0022] Figure 2 This is a sectional view of the mounting bracket;

[0023] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0024] Figure 4 This is a cross-sectional schematic diagram of the expansion body;

[0025] Figure 5 This is a structural diagram of the telescopic pole.

[0026] In the diagram, 1. Base; 2. Fixing frame; 3. Telescopic rod; 4. Expansion body; 5. Detection frame; 6. Placement seat; 7. Clamping assembly; 8. Detection assembly; 9. Extrusion block; 10. Reset component; 11. Control console; 12. Power cord; 21. Guide rail; 22. Detection drive; 23. Telescopic drive; 24. Traction rope; 25. Positioning assembly; 26. Guide wheel; 31. Central cavity; 32. Booster pump; 33. Positioning plate; 41. Heating wire; 42. Hot melt adhesive strip; 43. Compression chamber; 51. Slide table; 91. Guide rod; Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model and the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort. Furthermore, the design orientation only indicates the relative positional relationship between the components, not the absolute positional relationship.

[0028] This utility model embodiment provides a battery casing compression testing device. Please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The device mainly includes a base 1, a fixing frame 2, a telescopic rod 3, and an expansion body 4. The fixing frame 2 is mounted on the base 1, and the telescopic rod 3 is mounted on the fixing frame 2. The telescopic end of the telescopic rod 3 faces the base 1 and is fixedly connected to the expansion body 4. A placement seat 6 is provided on the base 1 at the position corresponding to the telescopic rod 3. The placement seat 6 is used to hold and place the battery casing, so that the battery casing is located below the expansion body 4, and the opening of the battery casing faces the expansion body 4. When the expansion body 4 descends in the direction of the telescopic end toward the base 1, the expansion body 4 enters the battery casing. The expansion body 4 squeezes the battery casing outward from inside the battery casing, causing it to deform.

[0029] In this application, the expansion body 4 is inserted into the battery casing before expansion. The expansion direction can be bidirectional or unidirectional. This application uses bidirectional expansion as an example for illustration. During bidirectional expansion, both sides are supported by the casing, which is convenient to implement and has fewer external factors, such as the casing is less likely to tilt.

[0030] When the required expansion direction is unidirectional, the expander 4 can be designed for unilateral expansion. For example, when the expander 4 is a telescopic structure, it can involve only unilateral telescopic movement, such as a unidirectional piston; rather than opposed telescopic movement, such as a bidirectional piston.

[0031] In the embodiments of this application, the fixing frame 2 can be a gantry structure, and the telescopic rod 3 is mounted on the top beam of the fixing frame 2, preferably in the middle of the top of the fixing frame 2, that is, in the middle of the top beam. The placement seat 6 is correspondingly opened directly below the telescopic rod 3, so that the expansion body 4 configured at the telescopic end can enter the battery casing held on the placement seat 6 when it descends, and squeeze the casing from the inside out to cause deformation.

[0032] In the embodiments of this application, the battery casing is clamped by the placement seat 6, and the battery casing is located below the expansion body 4. However, for casings of different sizes or different sides being detected, there may be a mismatch between the placement position of the casing and the expansion body 4.

[0033] Therefore, the position of the housing after clamping can be adjusted by the placement seat 6 on the base 1 so that the opening of the housing faces the expansion body 4. When the expansion body 4 descends, it can directly enter the interior of the housing through the opening. Depending on the descent height, different housing positions can be reached, and deformation operations simulating expansion can be performed at different positions.

[0034] By adjusting the relative position of the expansion body 4 and the shell, multi-directional detection of the shell can be achieved, and the deformation generated by each detection is of a single location nature.

[0035] In the embodiments of this application, the placement seat 6 includes a clamping ring and a centrally empty accommodating cavity. The placement seat 6 can be located at the center of the base 1, and the center of the base 1 is empty, matching and aligning with the accommodating cavity of the placement seat 6 to accommodate the battery casing. A clamping ring is provided around the accommodating cavity, and multiple clamping components 7 are arranged on the clamping ring. The multiple clamping components 7 are distributed around the battery casing to clamp the battery casing in the accommodating cavity.

[0036] Depending on the shape of the battery casing, such as the more common square casing or round casing, different shaped receiving cavities and clamping rings can be set. In this application, the direction is used as an example for illustration.

[0037] In a feasible embodiment, when the battery casing is a square casing, the clamping stability of the casing can be ensured by clamping only the four side walls of the battery casing. At least one clamping component 7 can be configured on the clamping rings corresponding to the four side walls of the battery casing. Specifically, only one clamping component 7 can be provided for the two sides of the battery casing, while two clamping components 7 can be provided for the large side of the battery casing to ensure clamping stability.

[0038] Corresponding to the square shell, the clamping structure of the clamping assembly 7 can be adaptively adjusted. The clamping assembly 7 may include a telescopic member and a clamping plate. The telescopic member drives the clamping plate to abut against the square shell. The clamping plate that directly abuts against the shell may be a flat plate structure. Multiple clamping plates constitute the clamping structure. The clamping structure should match the shape of the shell to ensure clamping stability.

[0039] Since multiple clamping plates jointly clamp the battery casing, when the position shifts, the clamping position of the battery casing can be adjusted based on the joint adjustment of multiple telescopic components. For example, if the telescopic stroke of the right side increases or decreases, the clamping position can be adjusted to the left; the same applies to other directions, but the contact relationship between each clamping plate and the casing should be kept stable.

[0040] In another feasible embodiment, when the battery casing is a circular casing, at least two clamping components 7 are required to stably clamp the circular casing. Multiple clamping components 7 on the clamping ring can be evenly distributed in a ring to ensure clamping stability.

[0041] Corresponding to the circular shell, the clamping structure of the clamping assembly 7 can be adaptively adjusted. The clamping assembly 7 may include a telescopic member and a clamping plate. The telescopic member drives the clamping plate to abut against the circular shell. The clamping plate that directly abuts against the shell has an arc-shaped structure. The two arc-shaped clamping plates can complete the stable clamping of the circular shell.

[0042] Since multiple clamping plates jointly clamp the battery casing, when the position shifts, the clamping assembly 7 that fixes the casing has significant limitations in adjusting the clamping position of the casing; however, the circular casing does not have the misalignment problem that occurs when the position of the square casing changes, so there is no need to adjust the clamping position.

[0043] That is, when the position of the placement seat 6 corresponds to the position of the telescopic rod 3, the expansion body 4 located at the telescopic end can accurately enter the clamped circular shell when it descends.

[0044] In the two embodiments described above, the telescopic component can be a cylinder, an electric push rod, etc. A clamping plate can be provided at the front end of the telescopic rod of the telescopic component, and the structure of the clamping plate matches the shape of the shell.

[0045] In this application, the expansion body 4 is lowered into the housing by the telescopic rod 3. The telescopic drive 23 can be mounted on the fixing frame 2. The telescopic drive 23 is used to drive the telescopic rod 3 to extend and retract, so that the expansion body 4 can descend to different depths in the battery housing, thereby expanding at different positions and causing deformation of the housing at different positions.

[0046] The telescopic drive 23 can be a drive motor. The rotating shaft of the drive motor is equipped with a gear plate that meshes with the outer wall of the telescopic rod 3. The outer wall of the telescopic rod 3 can be provided with transverse teeth along the axial direction. The drive motor can be fixed to the top beam. The telescopic rod 3 slides within the top beam. When the drive motor rotates forward, the telescopic end of the drive telescopic rod 3 descends, and the expansion body 4 descends accordingly, which can penetrate into different positions inside the shell. When it rotates in reverse, it rises, and the expansion body 4 rises accordingly, which can leave the shell.

[0047] In one feasible embodiment, please refer to Figure 2 The telescopic drive 23 can be a servo motor, which is mounted on the top beam. The servo motor drives the take-up shaft to rotate, and the rotating take-up shaft will release the wound traction rope 24. The free end of the traction rope 24 is fixed to the telescopic rod 3. The released traction rope 24 no longer pulls the telescopic rod 3, and the telescopic rod 3 drives the expansion body 4 to move downward. The descending expansion body 4 can then enter the battery casing.

[0048] Traction can be installed on both sides of the telescopic pole 3. The servo motor is inverted, and the winding shaft is built into the top beam. The fixed end of the traction rope 24 is fixed to the winding shaft, and the traction rope 24 is wound up. The free end of the traction rope 24 is fixed to the telescopic pole 3. The traction on both sides should be symmetrical, and the length and number of winding turns of the traction rope 24 should be the same. A guide wheel 26 can be installed on the top beam at the docking and fixing point of the traction rope 24 and the telescopic pole 3 to facilitate the turning operation of the traction rope 24.

[0049] The telescopic rod 3 passes through the top beam and is slidably connected to it. The top beam can be a hollow structure to facilitate the arrangement of the winding shaft and traction rope. The servo motor can be placed on the top of the top beam, and the guide wheel 26 can be placed on the bottom wall of the top beam. The running port of the traction rope 24 is reserved in the through-hole of the bottom wall so that the telescopic rod 3 and the traction rope 24 can enter and exit. At the same time, the telescopic rod 3 is limited in the through-hole at the top of the top beam so that it can slide in the vertical direction.

[0050] Once the expansion body 4 has been lowered to the correct position, the telescopic rod 3 should be fixed to prevent any changes in its lowering position. Therefore, a positioning component 25 can be installed based on the fixing frame 2 to fix the telescopic rod 3 in place.

[0051] In the embodiments of this application, the positioning component 25 is mounted on the fixing frame 2, and a positioning plate 33 is provided on the outer wall of the telescopic rod 3. The positioning component 25 is located on the outer wall side of the telescopic rod 3 and abuts against the positioning plate 33 to lock the telescopic stroke of the telescopic rod 3, so that the position of the telescopic rod 3 is fixed when the telescopic drive 23 stops. Up to four positioning plates 33 can be provided, located in the front, back, left, and right directions of the telescopic rod 3, respectively. Figure 5 As shown in the figure, these four positioning plates 33 can also be used in conjunction with the top beam for limited operation.

[0052] In a feasible embodiment, a positioning component 25 can be configured inside the top beam. The positioning component 25 is located between the upper and lower through holes. The positioning component 25 can be a brake disc, and the positioning plate 33 is a toothed plate. The rotating shaft of the brake disc meshes with the positioning plate 33. The brake disc is electrically connected to the control console 11. When the expansion body 4 is lowered to the correct position, the brake disc is controlled to lock the rotating shaft so that it cannot rotate, thereby fixing the position of the telescopic rod 3.

[0053] In another feasible embodiment, please refer to Figure 3 A positioning component 25 can be configured inside the top beam. The positioning component 25 is located between the upper and lower through openings. The positioning component 25 can be an electromagnet, and the positioning plate 33 can be a magnetic plate. The electromagnet is electrically connected to the control console 11. When the expansion body 4 is lowered to the correct position, the electromagnet and the magnetic plate are magnetically attracted to each other, thereby fixing the position of the telescopic rod 3.

[0054] In the embodiments of this application, the telescopic rod 3 has a built-in central cavity 31, and the expansion body 4 is a telescopic structure. The telescopic structure is electrically connected to the external control console 11 through the central cavity 31. Taking bidirectional expansion as an example:

[0055] In one feasible embodiment, a booster pump 32 is configured at the upper end of the central cavity 31. The booster pump 32 is electrically connected to the external control console 11. The expansion body 4 has a horizontally opposed compression chamber 43 built in it. The inner end of the compression chamber 43 is connected to the lower end of the central cavity 31. Piston structures are provided at both outer ends of the compression chamber 43. Extrusion blocks 9 are provided on the outer side of the piston structures. The booster pump 32 pressurizes the compression chamber 43 through the central cavity 31, causing the piston structures on both sides to move outward synchronously. The extrusion blocks 9 extrude pressure on the battery casing.

[0056] For example, the inner end of the compression chamber 43 of the expansion body 4 includes a main channel that docks with the central chamber 31 and branch channels that dock with the two side chambers respectively. The main channel and the two branch channels are connected and can divide the pressure into the two side chambers. The opposing chamber structures are completely identical, and the pressure distribution is symmetrical, so that the force applied by the extrusion block 9 to the outside is the same.

[0057] Specifically, the piston structure can be a guide rod 91, with one guide rod 91 on each of the upper and lower sides of the compression chamber 43. The extrusion block 9 is fixed to the front end of the two guide rods 91 and the extrusion block 9 seals the compression chamber 43. When the pressure increases, the extrusion block 9 is pushed outward and extrudes the shell that is attached to the side of the expansion body 4.

[0058] Specifically, a reset element 10 is provided between the extrusion block 9 and the expansion body 4. The reset element 10 can be a tension spring. When the pressure decreases, the extrusion block 9 can be pulled back, and the guide rod 91 can be reset. The tension spring can be located in the side chamber close to the extrusion block 9 and close to the guide rod 91, and the arrangement can be adjusted according to the number of guide rods 91.

[0059] During implementation, the control console 11 starts the booster pump 32, which injects high-pressure air into the expansion body 4 through the central cavity 31. The high-pressure air entering the expansion body 4 pushes the guide rod 91 to move outward. The outward-moving guide rod 91 pushes the extrusion block 9 to extrude the square battery casing, thereby simulating the situation of the square lithium battery casing expanding when the cell is in use.

[0060] When the square battery casing expands to the specified shape, the booster pump 32 extracts the high-pressure air from the expansion body 4 through the central cavity 31. After the air in the expansion body 4 is extracted, the reset member 10 pulls the guide rod 91 and the extrusion block 9 to move inward. The extrusion block 9, which moves inward, no longer extrudes the square lithium battery casing, and the square battery casing returns to its original shape. However, deformation has already occurred, and if there is damage, it can be detected.

[0061] Understandably, the telescopic length of the guide rod 91 can be adjusted according to actual needs to simulate different degrees of expansion.

[0062] In another feasible embodiment, the expansion body 4 can be positioned opposite the telescopic motors, with the bases of the telescopic motors placed side by side and the telescopic ends facing opposite directions to save space. The telescopic motors can be double telescopic rods, with the front ends of the double telescopic rods fixed to the compression blocks 9. Both telescopic motors are electrically connected to the control console 11, and the two telescopic motors operate synchronously with consistent telescopic strokes, allowing the compression blocks 9 on both sides to simultaneously compress the battery casing. Electrical connection to the control console 11 can be achieved through wiring in the central cavity 31.

[0063] In both embodiments described above, under normal conditions, the extrusion block 9 is embedded, with its outer surface inside the side of the expansion body 4; when the shell is extruded, the extrusion block 9 extends outward. The outer structure of the expansion body 4 surrounds the extrusion block 9.

[0064] Therefore, a heating groove can be formed around the extrusion block on the side wall of the expansion body. An electric heating wire 41 is laid at the bottom of the heating groove, and a hot melt adhesive strip 42 is placed inside the heating groove. The electric heating wire 41 is electrically connected to the control console 11. After the electric heating wire 41 is energized, it heats the hot melt adhesive strip to melt it. After cooling and solidification, the expansion body 4 can be bonded to the battery casing.

[0065] Understandably, once the expansion body 4 is in place, the hot melt adhesive strip 42 can be heated by the heating wire 41 to bond the expansion body 4 to the battery casing. This fixing method is applicable to both embodiments described above and ensures that the selected position of the expansion body 4 within the battery casing remains unchanged, even when the positioning component 25 is in operation.

[0066] In the embodiments of this application, the console 11 may be disposed on the base 1 and equipped with a power cord 12 for power supply.

[0067] In the embodiments of this application, the detection of the shell can be carried out after deformation, by keeping the placement seat 6 clamping the shell and removing the expansion body 4. However, before removing the expansion body 4, it should be ensured that the position of the detection device is in the deformed position for targeted detection.

[0068] The detection frame 5 can be set based on the fixed frame 2. Without affecting the operation of the expansion body 4 and the telescopic rod 3, the position of the detection frame 5 can be adjusted to the working position of the expansion body 4, and then the expansion body 4 can be removed.

[0069] In one feasible embodiment, the detection frame 5 is horizontally slidably connected to the fixed frame 2, the expansion body 4 is located inside the detection frame 5, and the size of the detection frame 5 is larger than the size of the accommodating cavity, so that the lifting displacement of the expansion body 4 and the detection frame 5 can operate independently without interfering with each other.

[0070] Specifically, the column of the fixed frame 2 has a built-in guide rail 21, and the top of the guide rail 21 is equipped with a detection drive 22. The detection frame 5 is equipped with a slide table 51 corresponding to the guide rail 21. The slide table 51 is slidably mounted on the guide rail 21. The detection drive 22 is connected to the slide table 51 for transmission, driving the detection frame 5 to rise and fall along the direction of the column. The telescopic rod 3 is parallel to the column.

[0071] The detection drive 22 and the slide 51 can be connected by a belt drive. The slide 51 is fixed to the belt. A follower wheel required for belt operation is provided at the lower part of the guide rail 21. The detection drive 22 is equipped with a drive wheel that drives the belt to run. The detection frame 5 is raised and lowered by the operation of the belt.

[0072] It is understandable that both columns of the fixed frame 2 can be equipped with detection drives to synchronously drive the detection frame 5, so that the detection frame 5 moves up and down in a horizontal posture.

[0073] The detection frame 5 is equipped with multiple detection components 8, all of which are electrically connected to the external control console 11. The detection components 8 can be ultrasonic sensor components or other sensor components capable of detecting internal cracks. Taking an ultrasonic sensor component as an example, the control console 11 activates the ultrasonic probe, which sends ultrasonic waves to the square lithium battery casing. After passing through the square lithium battery casing, the ultrasonic waves are received by the ultrasonic receiver on the opposite side. If the ultrasonic waves encounter internal cracks while passing through the square battery casing, they will be reflected, causing a change in the waveform of the ultrasonic waves received by the ultrasonic receiver. The ultrasonic receiver determines whether the square battery casing is damaged based on the received ultrasonic wave waveform.

[0074] For example, the detection component 8 includes a transmitter and a receiver, which are stacked vertically within the detection frame. Multiple detection components are evenly distributed inside the detection frame to detect the battery casing inside and determine whether the deformed casing is damaged.

[0075] Of course, the expansion body 4 can also be kept inside the shell for testing, but the squeezing force on the shell can be removed. In this case, the test data / waveform may be more complex.

[0076] In one specific embodiment, after the test is completed, the console 11 turns off the electromagnet, and the electromagnet no longer attracts the adsorption plate. The console 11 then restarts the heating wire 41, which heats and softens the hot melt adhesive strip 42. The softened hot melt adhesive strip 42 has reduced adhesion to the square battery casing. The servo motor drives the take-up shaft to rotate in the opposite direction. The rotating take-up shaft retracts the released traction rope 24. The traction rope 24 pulls the telescopic rod 3 upward. The rising telescopic rod 3 causes the expansion body 4 to exit the square battery casing. At the same time, the detection drive 22 drives the detection frame 5 to move upward along the guide rail 21 via the slide table 51. The detection frame 5 moves above the square battery casing. The console 11 then activates the electric push rod, which drives the clamping plate to move in the opposite direction. The reverse-moving clamping plate no longer presses against the square battery casing, and the square battery casing is removed from the placement seat 6.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0078] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A battery casing compression testing device, characterized in that, The device includes a base (1), a fixing frame (2), a telescopic rod (3), and an expansion body (4). The fixing frame (2) is mounted on the base (1), and the telescopic rod (3) is mounted on the fixing frame (2). The telescopic end of the telescopic rod (3) faces the base (1), and the telescopic end is fixedly connected to the expansion body (4). A placement seat (6) is provided on the base (1) at the position corresponding to the telescopic rod (3). The placement seat (6) is used to hold and place the battery casing, so that the battery casing is located below the expansion body (4), and the opening of the battery casing faces the expansion body (4). When the expansion body (4) descends in height as the telescopic end faces the base (1), the expansion body (4) enters the battery casing. The expansion body (4) inside the battery casing squeezes the battery casing outward to cause it to deform.

2. The battery casing compression testing device according to claim 1, characterized in that, The placement seat (6) includes a clamping ring and a central empty receiving cavity. Multiple clamping components (7) are arranged on the clamping ring. The multiple clamping components (7) are distributed around the battery housing and clamp the battery housing in the receiving cavity.

3. The battery casing compression testing device according to claim 2, characterized in that, The telescopic rod (3) is mounted on the top of the fixed frame (2) in the middle, and the accommodating cavity is located directly below the telescopic rod (3); the fixed frame (2) is equipped with a telescopic drive (23), which is used to drive the telescopic rod (3) to extend and retract, so that the expansion body expands at different positions in the battery casing.

4. The battery casing compression testing device according to claim 2, characterized in that, When the battery housing is a square housing, at least one clamping assembly (7) is configured on each of the four side walls of the battery housing corresponding to the clamping rings; the clamping assembly (7) includes a telescopic member and a clamping plate, the clamping plate is a flat plate structure, the telescopic member drives the clamping plate to abut against the square housing; multiple clamping plates jointly clamp the battery housing, and multiple telescopic members jointly adjust the clamping position of the battery housing.

5. The battery casing compression testing device according to claim 2, characterized in that, When the battery housing is a circular housing, the multiple clamping components (7) on the clamping ring are evenly distributed in a ring; the clamping component (7) includes a telescopic member and a clamping plate, the clamping plate has an arc-shaped structure, the telescopic member drives the clamping plate to abut against the circular housing; the multiple clamping plates together clamp the battery housing.

6. The battery casing compression testing device according to claim 3, characterized in that, It also includes a positioning component (25), which is mounted on the fixed frame (2). A positioning plate (33) is provided on the outer wall of the telescopic rod (3). The positioning component (25) is located on the outer wall side of the telescopic rod (3) and docks with the positioning plate (33) to lock the telescopic stroke of the telescopic rod (3) so that the position of the telescopic rod (3) is fixed when the telescopic drive (23) stops.

7. The battery casing compression testing device according to claim 1, characterized in that, The telescopic rod (3) has a built-in central cavity (31), and the expansion body (4) is a telescopic structure. The telescopic structure is electrically connected to the external control console (11) through the central cavity (31).

8. The battery casing compression testing device according to claim 7, characterized in that, A booster pump (32) is configured at the upper end of the central cavity (31). The booster pump (32) is electrically connected to the external control console (11). The expansion body (4) has a built-in horizontally opposed compression chamber (43). The inner end of the compression chamber (43) is connected to the lower end of the central cavity (31). Piston structures are provided at both outer ends of the compression chamber (43). An extrusion block (9) is provided on the outer side of the piston structure. The booster pump (32) pressurizes the compression chamber (43) through the central cavity (31), causing the piston structures on both sides to move outward synchronously. The extrusion block (9) extrudes the battery casing.

9. A battery casing compression testing device according to claim 2, characterized in that, It also includes a detection frame (5), which is horizontally connected to the fixing frame (2), the expansion body (4) is located inside the detection frame (5), and the size of the detection frame (5) is larger than the size of the accommodating cavity; the detection frame (5) is equipped with multiple detection components (8), and the multiple detection components (8) are electrically connected to the external control console (11).

10. A battery casing compression testing device according to claim 9, characterized in that, The column of the fixed frame (2) has a built-in guide rail (21). The top of the guide rail (21) is provided with a detection drive (22). The detection frame (5) is provided with a slide (51) corresponding to the guide rail (21). The slide (51) is slidably disposed on the guide rail (21). The detection drive (22) is connected to the slide (51) for transmission, driving the detection frame (5) to rise and fall along the direction of the column. The telescopic rod (3) is parallel to the column.

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